Attachment 15 New and Revised Specifications.pdf

SOLICITATION NO. W91238-23-B-0005

Amendment 0005

AMERICAN RIVER COMMON FEATURES (ARCF)

SACRAMENTO WEIR WIDENING

YOLO COUNTY, CA

AMENDMENT 0005 - SUMMARY:

A) SPECIFICATION 2279

a. Replace PROJECT TABLE OF CONTENTS

b. Add new Section 03 52 01 CONTROLLED LOW STRENGTH MATERIAL (CLSM)

c. Replace entire Section 05 50 15 CIVIL WORKS FABRICATIONS

d. Replace entire Section 05 59 20 FABRICATION OF HYDRAULIC STEEL

STRUCTURES

e. Replace entire Section 09 97 02 PAINTING: HYDRAULIC STRUCTURES

f. Replace entire Section 31 00 00 EARTHWORK

g. Replace entire Section 31 11 02 CLEARING, GRUBBING, AND STRIPPING

h. Replace entire Section 31 62 23.13 CONCRETE-FILLED STEEL PIPE PILES

i. Replace entire Section 35 31 19 STONE PROTECTION FOR STRUCTURES

j. Replace entire SUBMITTAL REGISTER attached to existing 01 33 00 SUBMITTAL

PROCEDURES

ARCF (2016) - Sacramento Weir Widening 2279

PROJECT TABLE OF CONTENTS

DIVISION 01 - GENERAL REQUIREMENTS

01 00 00 GENERAL REQUIREMENTS

01 11 00 SUMMARY OF WORK

01 20 00 PRICE AND PAYMENT PROCEDURES

01 31 20 DATA MANAGEMENT

01 32 01 PROJECT SCHEDULE

01 33 00 SUBMITTAL PROCEDURES

01 35 26 GOVERNMENTAL SAFETY REQUIREMENTS

01 42 00 SOURCES FOR REFERENCE PUBLICATIONS

01 45 00 QUALITY CONTROL

01 45 00.15 RESIDENT MANAGEMENT SYSTEM CONTRACTOR MODE (RMS CM)

01 50 00 TEMPORARY CONSTRUCTION FACILITIES AND CONTROLS

01 57 19 TEMPORARY ENVIRONMENTAL CONTROLS

01 57 23 TEMPORARY STORM WATER POLLUTION CONTROL

01 57 24 CARE AND DIVERSION OF WATER DURING CONSTRUCTION

01 71 10 MOBILIZATION AND DEMOBILIZATION

01 74 19 CONSTRUCTION WASTE MANAGEMENT AND DISPOSAL

01 75 00 FACILITY START-UP

01 78 00.10 AS-BUILT PRODUCTION, ADVANCED MODELING, DOCUMENTATION AND

CLOSEOUT SUBMITTALS

01 78 23 OPERATION AND MAINTENANCE DATA

DIVISION 02 - EXISTING CONDITIONS

02 32 13 SUBSURFACE DRILLING AND SAMPLING

02 41 00 DEMOLITION

02 41 19 MODIFICATION TO EXISTING CONCRETE STRUCTURES

DIVISION 03 - CONCRETE

03 23 00 STRESSED TENDON REINFORCING

03 30 00 CAST-IN-PLACE CONCRETE

03 42 13 PLANT-PRECAST CONCRETE PRODUCTS FOR BELOW GRADE

CONSTRUCTION

03 45 33 PRECAST PRESTRESSED STRUCTURAL CONCRETE

03 52 01 CONTROLLED LOW STRENGTH MATERIAL (CLSM)

DIVISION 05 - METALS

05 05 20 POST-INSTALLED CONCRETE AND MASONRY ANCHORS

05 50 15 CIVIL WORKS FABRICATIONS

05 59 20 FABRICATION OF HYDRAULIC STEEL STRUCTURES

DIVISION 07 - THERMAL AND MOISTURE PROTECTION

07 92 00 JOINT SEALANTS

DIVISION 08 - OPENINGS

08 10 00 HOLLOW METAL DOORS AND FRAMES

08 71 00 FINISH HARDWARE

DIVISION 09 - FINISHES

09 97 02 PAINTING: HYDRAULIC STRUCTURES

PROJECT TABLE OF CONTENTS Page 1

DIVISION 10 - SPECIALTIES

10 14 00 IDENTIFICATION DEVICES

10 14 53 TRAFFIC SIGNAGE

10 14 73 WATERWAY SIGNAGE

DIVISION 13 - SPECIAL CONSTRUCTION

13 30 01 FLOATING DEBRIS BOOM

DIVISION 23 - HEATING, VENTILATING, AND AIR CONDITIONING (HVAC)

23 81 00 DECENTRALIZED UNITARY HVAC EQUIPMENT

DIVISION 26 - ELECTRICAL

26 05 00 ELECTRICAL - BASIC REQUIREMENTS

26 05 19 WIRE AND CABLE - 600 VOLT AND BELOW

26 05 43 ELECTRICAL - EXTERIOR UNDERGROUND

26 05 48 SEISMIC PROTECTION FOR ELECTRICAL EQUIPMENT

26 08 13 ACCEPTANCE TESTING

26 20 00 ELECTRICAL DISTRIBUTION SYSTEM

26 28 00 OVERCURRENT AND SHORT CIRCUIT PROTECTIVE DEVICES

26 50 00 INTERIOR AND EXTERIOR LIGHTING

DIVISION 28 - ELECTRONIC SAFETY AND SECURITY

28 10 05 ELECTRONIC SECURITY SYSTEMS

DIVISION 31 - EARTHWORK

31 00 00 EARTHWORK

31 05 19 GEOTEXTILE

31 09 19 EMBANKMENT MONITORING

31 11 02 CLEARING, GRUBBING, AND STRIPPING

31 23 50 MASS SOIL MIXING

31 62 23.13 CONCRETE-FILLED STEEL PIPE PILES

DIVISION 32 - EXTERIOR IMPROVEMENTS

32 11 20 SUBBASES FOR FLEXIBLE PAVING

32 11 23 AGGREGATE BASE AND AGGREGATE SURFACING COURSES

32 11 29 LIME-MODIFIED SUBGRADE

32 12 13 BITUMINOUS TACK COATS

32 12 16.16 ROAD-MIX ASPHALT PAVING

32 17 23 PAVEMENT MARKINGS

32 31 13 FENCES AND GATES

32 31 40 DEBRIS FENCE

32 32 23 ECOLOGY BLOCK RETAINING WALL

32 92 33 GRASS SEEDING AND EROSION CONTROL

DIVISION 33 - UTILITIES

33 05 15 PRE-ENGINEERED CONCRETE UTILITY BUILDING

33 11 00 STEEL FIBER OPTIC CONDUIT

33 40 00 STORM DRAINAGE UTILITIES

33 46 16 SUBDRAINAGE PIPING

DIVISION 35 - WATERWAY AND MARINE CONSTRUCTION

PROJECT TABLE OF CONTENTS Page 2

35 20 16.53 VERTICAL LIFT GATES

35 31 19 STONE PROTECTION FOR STRUCTURES

35 31 19.20 TIED CONCRETE BLOCK MAT

DIVISION 40 - PROCESS INTERCONNECTIONS

40 05 12 PROCESS CONTROL

40 05 57 GATE ACTUATORS

40 63 43 PROGRAMMABLE LOGIC CONTROLLER (PLC) CONTROL SYSTEM

40 67 00 CONTROL SYSTEM EQUIPMENT PANELS AND RACKS

40 72 00 LEVEL INSTRUMENTATION

40 79 30 PIT TAG DETECTION SYSTEM

40 79 40 HYDROPHONE

40 79 50 FISH MONITORING CAMERAS

40 90 05 CONTROL LOOP DESCRIPTIONS

40 95 80 FIBER OPTIC COMMUNICATION SYSTEM

40 96 52 CONFIGURATION REQUIREMENTS - HUMAN MACHINE INTERFACE (HMI)

40 97 00 CONTROL AUXILIARIES

-- End of Project Table of Contents --

PROJECT TABLE OF CONTENTS Page 3

SECTION TABLE OF CONTENTS

DIVISION 03 - CONCRETE

SECTION 03 52 01

CONTROLLED LOW STRENGTH MATERIAL (CLSM)

PART 1 GENERAL

1.1 SUMMARY

1.2 REFERENCES

1.3 DEFINITIONS

1.4 SUBMITTALS

1.5 QUALITY ASSURANCE

1.5.1 Producer

1.6 DELIVERY, STORAGE, AND HANDLING

1.7 PROJECT CONDITIONS

PART 2 PRODUCTS

2.1 MANUFACTURER

2.1.1 CLSM

2.1.2 Stable-Air Generator Admixture

2.2 MATERIALS

2.2.1 Portland Cement

2.2.2 Aggregate

2.2.3 Fly Ash

2.2.4 Admixtures

2.2.5 WATER

2.3 CLSM MIXTURE

2.3.1 CLSM Mix Design

2.3.2 Mix Compressive Strength

2.3.3 Materials

2.3.4 Mix Permeability

2.3.5 Final Bleeding

2.3.6 Fresh Unit Weight

2.3.7 In-Place Yield

2.3.8 Flow Consistency

2.4 PIPE BRACING

PART 3 EXECUTION

3.1 EXAMINATION

3.2 PLACEMENT OF CONTROL DENSITY FILL

3.3 PROTECTION

3.4 QUALITY CONTROL TESTING DURING CONSTRUCTION

3.5 CLSM ACCEPTANCE

3.5.1 General

3.5.2 Acceptance Criteria Synopsis

-- End of Section Table of Contents --

SECTION 03 52 01 Page 1

SECTION 03 52 01

CONTROLLED LOW STRENGTH MATERIAL (CLSM)

PART 1 GENERAL

1.1 SUMMARY

This section specifies ready-mix Controlled Low Strength Material (CLSM).

CLSM will be used to encapsulate a portion of the fiber optic conduit as shown on the Drawings.

1.2 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

AMERICAN CONCRETE INSTITUTE INTERNATIONAL (ACI)

ACI 229R (2005) Controlled Low Strength Materials

ASTM INTERNATIONAL (ASTM)

ASTM C494/C494M (20179) Standard Specification for Chemical Admixtures for Concrete

ASTM C150/C150M (201822) Standard Specification for Portland Cement

ASTM C231/C231M (2017a) Standard Test Method for Air Content of Freshly Mixed Concrete by the Pressure Method

ASTM C260/C260M (2010a; R 2016) Standard Specification for Air-Entraining Admixtures for Concrete

ASTM C33/C33M (2018) Standard Specification for Concrete Aggregates

ASTM C618 (2017a9) Standard Specification for Coal Fly Ash and Raw or Calcined Natural Pozzolan for Use in Concrete

ASTM C94/C94M (2017a20) Standard Specification for Ready-Mixed Concrete

ASTM C940 (2016) Standard Test Method for Expansion and Bleeding of Freshly Mixed Grouts for Preplaced-Aggregate Concrete in the Laboratory

ASTM D4832 (2016; E 2018) Standard Test Method for Preparation and Testing of Controlled Low Strength Material (CLSM) Test Cylinders

SECTION 03 52 01 Page 2

ASTM D5084 (2016a) Standard Test Methods for Measurement of Hydraulic Conductivity of Saturated Porous Materials Using a Flexible Wall Permeameter

ASTM D5971 (2013) Standard Practice for Sampling Freshly Mixed Controlled Low-Strength Material

ASTM D6103 Standard Test Method for Flow Consistency of Controlled Low Strength Material (CLSM)

1.3 DEFINITIONS

A. Ready-mix CLSM is used for utility pipe back fill and is also known as controlled density fill or flowable fill. CLSM differs from Portland cement concrete as it contains a low cementitious content to reduce strength development for possible future removal. Chemical admixtures may also be used in CLSM to modify performance properties of strength, flow, set and permeability.

Pumpable mixes are available.

B. CLSM must be either machine tool or hand tool excavatable at minimum compressive strength of 100 psi and maximum compressive strength of 300 psi at 28 days.

1.4 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-03 Product Data

Admixtures; G

SD-05 Design Data

CLSM Mix Design; G

SD-06 Test Reports

Quality Control Testing during Construction; G

SD-07 Certificates

CLSM Testing; G

Cementitious materials; G

Fly Ash; G

Aggregate; G

SECTION 03 52 01 Page 3

1.5 QUALITY ASSURANCE

1.5.1 Producer

CLSM must be manufactured by a ready-mix concrete producer with a minimum of 5 years experience in the production of similar products.

1.6 DELIVERY, STORAGE, AND HANDLING

Deliver and handle in strict compliance with manufacturer's recommendations. Protect from damage due to weather, excessive temperatures, and construction operations.

1.7 PROJECT CONDITIONS

Perform work only when existing and forecasted weather conditions are within the limits established by the manufacturer of the materials and products used.

PART 2 PRODUCTS

2.1 MANUFACTURER

2.1.1 CLSM

Provide CLSM manufactured by a ready-mix concrete producer experienced in the design and control of flowable mixtures. Manufacturer must provide mixtures meeting performance properties specified herein.

2.1.2 Stable-Air Generator Admixture

Provide Stable-Air Generator admixture DaraFill by Grace Construction Products, or Government reviewed equal, for CLSM meeting specified requirements. DaraFill addition rate must be 3 oz. dosage per 1 cubic yard;

and addition rates must comply with the manufacturer's data sheet.

2.2 MATERIALS

The Contractor must be responsible for the CLSM mix proportions, and ensuring the mixture is suitable for the application. The CLSM mixture design must be accomplished by an approved independent commercial materials testing laboratory. The CLSM Testing results must be submitted. The CLSM mixture design studies must include trial design mixtures and testing to verify the proposed CLSM ACI 229R, must be a self-compacting fill, low permeability, flowable or pumpable mixture. CLSM must consist of Portland cement, Fly Ash and fine and coarse aggregates, admixtures, and water.

2.2.1 Portland Cement

Portland Cement: ASTM C150/C150M, Type II, meeting the low alkali requirement.

2.2.2 Aggregate

Provide material meeting the requirements of ASTM C33/C33M.

Submit test reports demonstrating aggregates proposed for use conform to specified requirements. Submit with the CLSM Mixture Proportions Submittal.

SECTION 03 52 01 Page 4

2.2.3 Fly Ash

Fly ash must meet ASTM C618 requirements for Class F, meeting the low alkali, drying shrinkage, and uniformity requirements.

Manufacturers certification and current mill test reports attesting that cementitious materials and fly ash proposed for use conform to the specified requirements. Submit with the CLSM Proportions Submittal.

2.2.4 Admixtures

Air-entraining admixtures must conform to ASTM C260/C260M. Accelerating admixtures must conform to ASTM C494/C494M, Type C. Water-Reducing or retarding admixtures must conform to ASTM C494/C494M., Type A, B, or D.

High-range water-reducing admixtures must conform to ASTM C494/C494M, Type F or G. Permeability-reducing admixtures may be used if required and must be a dry-powdered bentonite used as recommended in ACI 229R limited to 2 percent by volume. Admixtures must be evaluated in the CLSM mixture design studies.

Submit manufacturers descriptive literature demonstrating the admixtures proposed for use in CLSM mixtures conform to specified requirements. Submit with the CLSM Mixture Proportions submittal.

2.2.5 WATER

Water for mixing must be fresh, clean, and potable, conforming to

ASTM C94/C94M.

2.3 CLSM MIXTURE

CLSM must contain Portland cement and must be proportioned to have a high fly ash content to reduce hydraulic conductivity. The fly ash content must be between 10 and 20 percent of the total aggregate by weight as determined in the mixture design studies. Fly ash content may be increased as required to achieve the hydraulic conductivity requirement. CLSM mixture must include air entraining admixtures and water reducing admixtures to reduce mix water requirements and improve flow characteristics. CLSM must be proportioned to achieve a flowability and hardening time suitable for the application.

2.3.1 CLSM Mix Design

The CLSM mix design must produce a consistency that will result in a flowable product at the time of placement which does not require manual means to move it into place. Report the proportions of material used for each trial mix and proposed job mixture.

The results of trial mixture design studies, along with a statement giving the maximum nominal coarse aggregate size and the proportions of ingredients that will be used in the manufacture of CLSM, must be submitted at least 30 days prior to commencing placement operations. Aggregate weights must be based on the saturated surface dry condition. The statement must be accompanied by test results from an approved independent commercial testing laboratory, showing that mixture design studies have been made with materials proposed for the project and that the proportions selected will produce CLSM of the quantities specified. No substitutions must be made in the materials used in the materials used in the mixture design studies without additional tests to show that the quality of the CLSM is

SECTION 03 52 01 Page 5 satisfactory.

2.3.2 Mix Compressive Strength

Provide mix with compressive strength of minimum 100 psi and maximum 300 psi according to ASTM D4832 at 28 days after placement.

2.3.3 Materials

Materials to be used in CLSM must meet the requirements of ACI 229R.

2.3.4 Mix Permeability

Provide mix with maximum permeability of 1x10-5 cm/sec according to ASTM D5084 at twenty-eight (28) days after placement.

2.3.5 Final Bleeding

CLSM must have minimal subsidence and bleed water which is measured as a Final Bleeding of less than 2.0 percent (retains 98.0 percent of original height after placement, approximately 1/4 inch per foot of depth) per

ASTM C940.

2.3.6 Fresh Unit Weight

The fresh unit weight must be 90 - 110 lbs/ft3 (1600 - 1760 kg/m3), except where specified, and in the absence of strength data the cementitious content must be a maximum of 150 lbs/cy (90 kg/m3).

2.3.7 In-Place Yield

CLSM must have an in-place yield of 98% of design yield.

2.3.8 Flow Consistency

CLSM must have a minimum flowability of 8 inches as determined by ASTM

D6103. </TXT>

<TXT> The consistency of the CLSM must be such that the material flows easily into all openings between the pipe and the lower portion of the trench. When trenches are on a steep slope, a stiffer mix of slurry may be required to prevent CLSM from flowing down the trench. When a stiffer mix is used, vibration must be performed to ensure that the CLSM slurry completely fills all spaces between the pipe and the lower portion of the trench.

2.4 PIPE BRACING

Provide design of proposed pipe bracing system to prevent pipe flotation during installation of CLSM. Provide buoyancy calculations and bracing requirements of the resisting members.

PART 3 EXECUTION

3.1 EXAMINATION

Examine conditions of substrates and other conditions under which work is to be performed and notify the Government, in writing, of circumstances

SECTION 03 52 01 Page 6 detrimental to the proper completion of the work. Do not proceed until unsatisfactory conditions are corrected.

3.2 PLACEMENT OF CONTROL DENSITY FILL

The CLSM must be placed in a manner that provides complete encapsulation of the pipes. Concrete vibrators such as stick vibrators must be used along the pipes to ensure no void spaces exist around or near the pipes.

A. Secure pipe to be encased in CLSM to prevent pipe displacement during placement. The percentage reduction in hydrostatic pressure achieved with the use of a Stable Air Generator may be used to calculate anchorage requirements.

B. The pipe must be placed on supports and braced as recommended by the pipe manufacturer to prevent flotation when placing the CLSM.

C. Place CLSM in separate lifts as recommended by the pipe manufacturer to prevent the pipe from floating during installation.

3.3 PROTECTION

Protect CLSM from traffic until the material has reached 70% of the design strength.

3.4 QUALITY CONTROL TESTING DURING CONSTRUCTION

Concrete must be sampled and tested for quality control by the Contractor during the placement of the concrete as follows:

REQUIREMENT TEST METHOD NUMBER OF TESTS

Sampling fresh ASTM D5971 As required Controlled Low except modified for each Strength Material slump test

Flow Consistency ASTM D6103 One for each Test CLSM load at point of discharge and one for each set of com-pressive strength tests

Air content by ASTM C231/C231M One for each set of pressure method compressive strength tests

Compression test ASTM D5971 One set of six specimens standard cylinders for each compressive strength test

CLSM Hourly when air temperature temperature is 40 degrees F or below and 80 degrees F or above; each time a set of compression

SECTION 03 52 01 Page 7 test specimens is made

Compressive ASTM D4832 One set for each 50 strength test cubic yards or fraction thereof of placed in any one day; two specimens tested at 7 days, three specimens tested at 28 days and one specimen re-tained in reserve for testing if required

Permeability ASTM D5084 One set for each 50 test cubic yards or fraction thereof of placed in any one day

Test reports for concrete for Chemical Composition, Mechanical Usability and Soundness must be submitted by the Contractor meeting all design Specifications as required by referenced standards within this section.

3.5 CLSM ACCEPTANCE

3.5.1 General

Final acceptance of the CLSM will be based upon the Contractor's Quality Control Records as identified in the Contractor's Quality Control test results and the Government's Quality Assurance test results. Both the Contractor's and the Government's testing must demonstrate that the Contract requirements are met prior to acceptance of the work. If, during the course of construction, the Contractor's Quality Control testing indicates noncompliance with the Specifications, immediately notify the Government in writing. Notification must include the remedial action to be taken by the Contractor to bring work back into compliance. Remove, dispose of, and replace all CLSM that does not meet the acceptance criteria at no cost to the Government.

3.5.2 Acceptance Criteria Synopsis

The following is a summarization of acceptance criteria for part but not all of the testing and procedural requirements. Refer to the entire Specifications and Plans for all Contract requirements.

a. Compressive strength: Minimum 100 psi and Maximum 300 psi at 28 days.

b. Permeability: Maximum 1x10-5 cm/sec at 28 days.

-- End of Section --

SECTION 03 52 01 Page 8

DIVISION 05 - METALS

SECTION 05 50 15

CIVIL WORKS FABRICATIONS

PART 1 GENERAL

1.1 REFERENCES

1.2 SUBMITTALS

1.3 QUALITY ASSURANCE

1.4 DELIVERY, STORAGE, AND PROTECTION

1.5 ENVIRONMENTAL REQUIREMENTS

1.6 DATA REQUIREMENTS

PART 2 PRODUCTS

2.1 MISCELLANEOUS METALS AND STANDARD METAL ARTICLES

2.1.1 Structural Steel

2.1.2 Steel Plates

2.1.2.1 Structural

2.1.3 Steel Tubing

2.1.3.1 Structural

2.1.4 Steel Pipes and Pipe Fittings

2.1.4.1 Pipes

2.1.5 Stainless Steel

2.1.5.1 Plate, Sheet, and Strip

2.1.5.2 Bars and Shapes

2.1.5.3 Pipe

2.1.6 Steel Forgings

2.1.6.1 General Industrial Use

2.1.7 Gray Iron Castings

2.1.8 Malleable Iron Castings

2.1.9 Aluminum

2.1.9.1 Sheets and Plates

2.1.9.2 Bars, Rods and Wire

2.1.9.3 Structural Shapes

2.1.9.4 Castings

2.1.9.5 Pipes and Tubes

2.1.10 Bolts, Nuts, and Washers

2.1.10.1 High-Strength Bolts, Nuts, and Washers

2.1.10.2 Bolts, Nuts, and Washers (Other Than High-Strength)

2.1.10.3 Bolts, Nuts, and Washers (Aluminum)

2.1.10.4 Anchorage

2.1.10.4.1 Anchor Rods

2.1.10.4.2 Anchor Nuts

2.1.10.4.3 Anchor Washers

2.1.10.4.4 Anchor Plate Washers

2.1.11 Adhesive Anchors

2.1.12 Lag Screws and Bolts

2.1.13 Toggle Bolts

2.1.14 Powder Driven Fasteners

SECTION 05 50 15 Page 1

2.1.15 Screws

2.1.16 Steel Gratings

2.1.17 Floor Plates, Patterned

2.1.18 Submittals Requirements

2.2 SHOP FABRICATED METAL ITEMS

2.2.1 Steel Railings and Handrails

2.2.2 Gratings and Cover Plates

2.2.2.1 Grating

2.2.2.2 Cover Plates

2.2.3 Steel Stairs

2.2.4 Recess Frames

2.2.5 Ladders

2.2.6 Ladder Rungs andGrab Bars

2.2.7 Safety Chains

2.2.8 Surface Finishes

2.2.8.1 Galvanizing and Zinc Repair

2.2.8.2 Nonferrous Metal Surfaces

2.2.8.3 Aluminum Surfaces

2.2.9 Certified Test Reports

PART 3 EXECUTION

3.1 GENERAL INSTALLATION REQUIREMENTS

3.2 ANCHORAGE, FASTENINGS, AND CONNECTIONS

3.3 FINISHES

3.3.1 Dissimilar Materials

3.3.2 Field Preparation

3.4 STEEL RAILINGS AND HANDRAILS

3.4.1 Installation Instructions

3.4.2 Preparation

3.4.3 Steel Handrail

3.5 COVER PLATES AND FRAMES

3.6 LADDERS

3.7 STEEL STAIRS

3.8 INSTALLATION OF GUARD POSTS (BOLLARDS/PIPE GUARDS)

-- End of Section Table of Contents --

SECTION 05 50 15 Page 2

SECTION 05 50 15

CIVIL WORKS FABRICATIONS

PART 1 GENERAL

1.1 REFERENCES

The publications listed below form a part of this specification to the extent referenced. The publications are referred to within the text by the basic designation only.

ALUMINUM ASSOCIATION (AA)

AA DAF45 (2003; Reaffirmed 2009) Designation System for Aluminum Finishes

AMERICAN INSTITUTE OF STEEL CONSTRUCTION (AISC)

AISC 360 (2016) Specification for Structural Steel Buildings

AMERICAN SOCIETY OF MECHANICAL ENGINEERS (ASME)

ASME B18.2.1 (2012; Errata 2013) Square and Hex Bolts and Screws (Inch Series)

ASME B18.2.2 (2015) Nuts for General Applications:

Machine Screw Nuts, Hex, Square, Hex Flange, and Coupling Nuts (Inch Series)

ASME B18.6.2 (1998; R 2010) Slotted Head Cap Screws, Square Head Set Screws, and Slotted Headless Set Screws: Inch Series

ASME B18.6.3 (2013; R 2017) Machine Screws, Tapping Screws, and Machine Drive Screws (Inch Series)

ASME B18.21.1 (2009; R 2016) Washers: Helical Spring-Lock, Tooth Lock, and Plain Washers (Inch Series)

AMERICAN SOCIETY OF SAFETY PROFESSIONALS (ASSP)

ASSP A10.3 (2013) Safety Requirements for Powder-Actuated Fastening Systems American National Standard for Construction and Demolition Operations

AMERICAN WELDING SOCIETY (AWS)

AWS D1.1/D1.1M (2020) Structural Welding Code - Steel

AWS D1.2/D1.2M (2014; Errata 1 2014; Errata 2 2020) Structural Welding Code - Aluminum

SECTION 05 50 15 Page 3

AWS D1.5M/D1.5 (2020) Bridge Welding Code

AWS D1.6/D1.6M (2017) Structural Welding Code - Stainless Steel

ASTM INTERNATIONAL (ASTM)

ASTM A36/A36M (2019) Standard Specification for Carbon Structural Steel

ASTM A48/A48M (2003; R 2016) Standard Specification for Gray Iron Castings

ASTM A53/A53M (2020) Standard Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated, Welded and Seamless

ASTM A123/A123M (2017) Standard Specification for Zinc (Hot-Dip Galvanized) Coatings on Iron and Steel Products

ASTM A193/A193M (2020) Standard Specification for Alloy-Steel and Stainless Steel Bolting Materials for High-Temperature Service and Other Special Purpose Applications

ASTM A240/A240M (2019) Standard Specification for Chromium and Chromium-Nickel Stainless Steel Plate, Sheet, and Strip for Pressure Vessels and for General Applications

ASTM A276/A276M (2017) Standard Specification for Stainless Steel Bars and Shapes

ASTM A307 (2021) Standard Specification for Carbon Steel Bolts, Studs, and Threaded Rod 60 000 PSI Tensile Strength

ASTM A312/A312M (2019) Standard Specification for Seamless, Welded, and Heavily Cold Worked Austenitic Stainless Steel Pipes

ASTM A467/A467M (2020) Standard Specification for Machine Coil Chain

ASTM A47/A47M (1999; R 2018; E 2018) Standard Specification for Ferritic Malleable Iron Castings

ASTM A500/A500M (2021) Standard Specification for Cold-Formed Welded and Seamless Carbon Steel Structural Tubing in Rounds and Shapes

ASTM A563 (2015) Standard Specification for Carbon and Alloy Steel Nuts

ASTM A563M (2007; R 2013) Standard Specification for

SECTION 05 50 15 Page 4

Carbon and Alloy Steel Nuts (Metric)

ASTM A564/A564M (2019) Standard Specification for Hot-Rolled and Cold-Finished Age-Hardening Stainless Steel Bars and Shapes

ASTM A572/A572M (2021; E 2021) Standard Specification for High-Strength Low-Alloy Columbium-Vanadium Structural Steel

ASTM A653/A653M (2020) Standard Specification for Steel Sheet, Zinc-Coated (Galvanized) or Zinc-Iron Alloy-Coated (Galvannealed) by the Hot-Dip Process

ASTM A668/A668M (2020a) Standard Specification for Steel Forgings, Carbon and Alloy, for General Industrial Use

ASTM A780/A780M (2009; R 2015) Standard Practice for Repair of Damaged and Uncoated Areas of Hot-Dip Galvanized Coatings

ASTM A786/A786M (2015a) Standard Specification for Hot-Rolled Carbon, Low-Alloy, High-Strength Low-Alloy, and Alloy Steel Floor Plates

ASTM A924/A924M (2020) Standard Specification for General Requirements for Steel Sheet, Metallic-Coated by the Hot-Dip Process

ASTM A992/A992M (2020) Standard Specification for Structural Steel Shapes

ASTM B26/B26M (2014; E 2015) Standard Specification for Aluminum-Alloy Sand Castings

ASTM B209 (2014) Standard Specification for Aluminum and Aluminum-Alloy Sheet and Plate

ASTM B211/B211M (2019) Standard Specification for Aluminum and Aluminum-Alloy Rolled or Cold Finished Bar, Rod, and Wire

ASTM B241/B241M (2016) Standard Specification for Aluminum and Aluminum-Alloy Seamless Pipe and Seamless Extruded Tube

ASTM B308/B308M (2010; R 2020) Standard Specification for Aluminum-Alloy 6061-T6 Standard Structural Profiles

ASTM C1513 (2018) Standard Specification for Steel Tapping Screws for Cold-Formed Steel Framing Connections

ASTM D1187/D1187M (1997; E 2011; R 2011) Asphalt-Base Emulsions for Use as Protective Coatings

SECTION 05 50 15 Page 5 for Metal

ASTM F436 (2011) Hardened Steel Washers

ASTM F436/F436M (2019) Standard Specification for Hardened Steel Washers Inch and Metric Dimensions

ASTM F467 (2013; E 2014; E 2014) Standard Specification for Nonferrous Nuts for General Use

ASTM F468 (2016) Standard Specification for Nonferrous Bolts, Hex Cap Screws, and Studs for General Use

ASTM F844 (2007a; R 2013) Washers, Steel, Plain (Flat), Unhardened for General Use

ASTM F1554 (2020) Standard Specification for Anchor Bolts, Steel, 36, 55, and 105-ksi Yield Strength

ASTM F3125/F3125M (2019) Standard Specification for High Strength Structural Bolts and Assemblies, Steel and Alloy Steel, Heat Treated, Inch Dimensions 120 ksi and 150 ksi Minimum Tensile Strength, and Metric Dimensions 830 MPa and 1040 MPa Minimum Tensile Strength

NATIONAL ASSOCIATION OF ARCHITECTURAL METAL MANUFACTURERS (NAAMM)

NAAMM AMP 521 (2001; R 2012) Pipe Railing Systems Manual

NAAMM MBG 531 (2017) Metal Bar Grating Manual

SOCIETY FOR PROTECTIVE COATINGS (SSPC)

SSPC Paint 20 (2019) Zinc-Rich Primers (Type I, Inorganic, and Type II, Organic)

SSPC Paint 29 (2002; E 2004) Zinc Dust Sacrificial Primer, Performance-Based

U.S. ARMY CORPS OF ENGINEERS (USACE)

EM 385-1-1 (2014) Safety and Health Requirements Manual

1.2 SUBMITTALS

Government approval is required for submittals with a "G" designation;

submittals not having a "G" designation are for information only. When used, a designation following the "G" designation identifies the office that will review the submittal for the Government. Submit the following in accordance with Section 01 33 00 SUBMITTAL PROCEDURES:

SD-01 Preconstruction Submittals

SECTION 05 50 15 Page 6

Welding Procedure Specifications (WPS); G

Performance Qualification Records (PQR); G

SD-02 Shop Drawings

Shop Fabricated Metal Items; G

SD-06 Test Reports

Rotational Capacity

Certified Test Reports; G

SD-07 Certificates

Welder Certifications; G

Weld Tracking Log; G

Certified Welding Inspector; G

Nondestructive Testing Personnel; G

NACE Certifications; G

SD-08 Manufacturer's Instructions

Steel Railings And Handrails Installation Instructions

Anchorage And Fastening Systems Installation Instructions

1.3 QUALITY ASSURANCE

a. Form miscellaneous metalwork to shape and size, with sharp lines and angles and true curves. Drill and punch producing clean true lines and surfaces. Provide exposed surfaces of work in place with a smooth finish, and unless otherwise approved. Where tight fits are required, mill joints. Cope or miter corner joints, well formed, and in true alignment. Accurately set work to established lines and elevations and securely fastened in place. Install in accordance with manufacturer's installation instructions and approved drawings, cuts, and details.

b. Perform welding continuously along the entire area of contact except where tack welding is permitted. Do not tack weld exposed connections of work in place. Grind exposed welds smooth.

c. Qualify welders, tack welders, weld operators, welding procedures (submit Welding Procedure Specifications (WPS) for each weld to be made and submit Performance Qualification Records (PQR) for approval before fabrication is commenced), perform welding, welding inspection, and corrective welding, in accordance with AWS D1.1/D1.1M. Welders performing Aluminum welding must be qualified in accordance with AWS D1.2/D1.2M and welders performing stainless steel welding (including stainless steel to carbon steel) must be qualified in accordance with AWS D1.6/D1.6M. All welders must be qualified in the process and position required. Use procedures, materials, and equipment of the type required for the work. Submit welder certifications for each welder stating the type of welding and position

SECTION 05 50 15 Page 7 qualified for, the code and procedure qualified under, date qualified, and the firm and individual certifying the qualification tests. If the qualification date of the welding operator is more than 6 months old, the welding operator's qualification certificate must be accompanied by a Weld Tracking Log by the welder attesting to the fact that he has been engaged in welding since the date of certification, with no break in welding service greater than 6 months.

Conform to all requirements specified in AWS D1.1/D1.1M for structural steel welding, AWS D1.2/D1.2M for aluminum welding, and AWS D1.6/D1.6M for stainless steel welding and the welding of stainless steel to carbon steel.

Submit Certified Welding Inspector and Nondestructive Testing Personnel certifications showing conformance to the applicable AWS code discussed herein for the material being fabricated.

An AWS Certified Welding Inspector (CWI) meeting the specified qualifications must approve all welder qualifications and welding procedures before they are submitted to Government for review.

d. Fabricator must have minimum of 10 years of experience in fabrication of metal items specified, with active and enforced quality control, quality assurance, and inspection programs in place, as described in the applicable Codes and participate in the AISC Certification program and is designated an AISC Certified Plant, Category BU (formally known as STD) at the time of bid.

e. Engineer for contractor-designed systems and components: Professional structural engineer appropriately licensed in the State of California and must be signed and stamped by this individual.

f. NACE certified inspector must have minimum of two years of experience performing inspections as indicated and have a current Level III coating inspector certification. These qualifications must be demonstrated in the NACE Certifications.

1.4 DELIVERY, STORAGE, AND PROTECTION

Protect from corrosion, deformation, and other types of damage. Store items in an enclosed area free from contact with soil and weather. Remove and replace damaged items with new items.

Remove rust preventive coating just prior to field erection, using a remover approved by the metal manufacturer. Surfaces, when assembled, must be free of rust, grease, dirt, and other foreign matter.

1.5 ENVIRONMENTAL REQUIREMENTS

Do not clean or paint surface when damp or exposed to foggy or rainy weather, when metallic surface temperature is less than 5 degrees F above the dew point of the surrounding air, or when surface temperature is below 45 degrees F or over 95 degrees F, unless approved by the Contracting Officer.

1.6 DATA REQUIREMENTS

The Contractor and any Subcontractors performing work specified in this section shall provide all generated data. No data source or format shall

SECTION 05 50 15 Page 8 be exempted. All data generated as part of this specification is subject to the requirements in Section 01 31 20 DATA MANAGEMENT. In case of a conflict in Contract language, the requirement must be whichever is more detailed, rigorous, specific, precise, and complete as determined by the

COR.

PART 2 PRODUCTS

2.1 MISCELLANEOUS METALS AND STANDARD METAL ARTICLES

Conform to the respective specifications and other designated requirements for miscellaneous metal materials and standard metal articles. Size as specified or indicated. Where material requirements are not specified, furnish materials suitable for the intended use and subject to approval.

2.1.1 Structural Steel

W-shapes and WT-shapes use ASTM A992/A992M, Grade 50 and all other plates and rolled sections use ASTM A36/A36M.

2.1.2 Steel Plates

2.1.2.1 Structural

ASTM A572/A572M, Grade 50.

2.1.3 Steel Tubing

2.1.3.1 Structural

Provide structural-steel tubing, hot-formed, welded or seamless, conforming to ASTM A500/A500M, Grade B, with 46 ksi minimum yield strength unless otherwise noted.

2.1.4 Steel Pipes and Pipe Fittings

2.1.4.1 Pipes

ASTM A53/A53M, Type E or S, Grade B nominal size and weight class or outside diameter and nominal wall thickness as shown.

2.1.5 Stainless Steel

All stainless steel must have a minimum yield strength of 30 ksi and minimum tensile strength of 75 ksi. Stainless steel in welded applications must use the low carbon 'L' type variation of the specified alloy.

2.1.5.1 Plate, Sheet, and Strip

ASTM A240/A240M, UNS S30400. Plate finish must be hot-rolled and annealed or heat treated, and blast cleaned or pickled. Provide No. 1 sheet and strip finish. Use UNS S30403 with carbon content less than 0.03% for all welded stainless steel components.

2.1.5.2 Bars and Shapes

Conform to the following, as specified or shown, for stainless steel bars and shapes:

SECTION 05 50 15 Page 9

a. ASTM A276/A276M, UNS S30400 with a maximum carbon content of 0.08 percent, Condition A, hot-finished or cold- finished, Class C. Use UNS S30403 with carbon content less than 0.03% for all welded stainless steel components.

b. ASTM A564/A564M, UNS S17400, age-hardened heat treatment condition, hot-finished or cold-finished, Class C.

2.1.5.3 Pipe

ASTM A312/A312M, seamless, UNS S30400, NPS and schedule number or outside diameter and nominal wall thickness as shown, plain ends.

2.1.6 Steel Forgings

2.1.6.1 General Industrial Use

ASTM A668/A668M, Class as shown in contract drawings, or Class D if not indicated, carbon content not exceeding 0.35 percent, and an overall chemical composition which results in satisfactory weldability.

2.1.7 Gray Iron Castings

Gray iron castings conforming to ASTM A48/A48M, Class 30.

2.1.8 Malleable Iron Castings

Malleable iron castings conforming to ASTM A47/A47M, grade as selected.

2.1.9 Aluminum

2.1.9.1 Sheets and Plates

ASTM B209, Alloy 6061-T6, 32,000 psi tensile yield strength minimum.

2.1.9.2 Bars, Rods and Wire

ASTM B211/B211M, Alloy 6061-T6, 32,000 psi tensile yield strength minimum

2.1.9.3 Structural Shapes

ASTM B308/B308M, Alloy 6061-T6, 32,000 psi tensile yield strength minimum

2.1.9.4 Castings

ASTM B26/B26M, alloy and temper as selected.

2.1.9.5 Pipes and Tubes

ASTM B241/B241M, Alloy 6063, Temper as selected, size and schedule number or outside diameter and wall thickness as shown.

2.1.10 Bolts, Nuts, and Washers

Provide bolts, nuts, and washers of the material, grade, type, class, style and finish indicated or best suited for intended use.

SECTION 05 50 15 Page 10

2.1.10.1 High-Strength Bolts, Nuts, and Washers

a. ASTM F3125/F3125M Grade A325. Install, inspect, and test all high strength bolts and accessories in accordance with Section 05 59 20

FABRICATION OF HYDRAULIC STEEL STRUCTURES.

b. Nuts must be ASTM A563 and washers must be ASTM F436 with 2 washers provided with each bolt.

c. Hot-dip galvanized all components.

d. Conduct Rotational-capacity testing for all fastener assemblies in accordance with ASTM F3125/F3125M. Test as an assembly each combination of bolt production lot, nut lot, and washer lot. Assign a rotational-capacity lot number to each combination of lots tested. Test bolts in a Skidmore-Wilhelm Calibrator or an acceptable equivalent device. Submit test report for rotational capacity.

2.1.10.2 Bolts, Nuts, and Washers (Other Than High-Strength)

a. Bolts and Nuts - ASTM A307, Grade A, hot-dip galvanized.

b. Washers, hot-dip galvanized

(1) Plain Washers - ASME B18.2.2, Type B.

(2) Lock Washer - ASME B18.21.1.

(3) Beveled Washers - ASTM F436/F436M.

2.1.10.3 Bolts, Nuts, and Washers (Aluminum)

a. Bolts - ASTM F468, alloy 2024 T4

b. Nuts - ASTM F467, alloy 2024 T4

c. Washers - Same material and alloy as found in accompanying bolts and nuts.

2.1.10.4 Anchorage

2.1.10.4.1 Anchor Rods

ASTM F1554 Gr 36, Class 1A. Stainless steel ASTM A193/A193M.

2.1.10.4.2 Anchor Nuts

ASTM A563M (ASTM A563), Grade A, hex style. Stainless steel ASTM A193/A193M.

2.1.10.4.3 Anchor Washers

ASTM F844. Stainless steel Type 304 conforming to ASTM A276/A276M.

2.1.10.4.4 Anchor Plate Washers

ASTM A36/A36M Stainless steel Type 304 conforming to ASTM A276/A276M.

2.1.11 Adhesive Anchors

See Section 03 30 00 CAST-IN-PLACE CONCRETE.

SECTION 05 50 15 Page 11

2.1.12 Lag Screws and Bolts

ASME B18.2.1, type and grade best suited for the purpose.

2.1.13 Toggle Bolts

ASME B18.2.1.

2.1.14 Powder Driven Fasteners

Follow safety provisions of ASSP A10.3.

2.1.15 Screws

ASME B18.2.1, ASME B18.6.2, ASME B18.6.3 and ASTM C1513.

2.1.16 Steel Gratings

a. Metal bar type grating NAAMM MBG 531.

b. Bearing bars: Rectangular 1-1/2 by 3/16 IN and maximum 1-3/16 IN OC spacing unless otherwise noted on Drawings.

c. Cross bars: Welded, swagged or pressure locked to bearing bars.

Maximum 4 IN OC spacing.

d. Top edges of bars: Serrated or grooved.

e. Finish: Galvanized with galvanized clips and bolts and galvanized seat angles.

f. Ends and perimeter edges: Banded.

g. Openings through grating: Reinforced to provide required load carrying capacity and banded with 4 IN high toe plate.

h. Provide joints at openings between individual grating sections.

2.1.17 Floor Plates, Patterned

Floor plate ASTM A786/A786M. Steel plate must not be less than 14 gage.

Diamond pattern must be No. 3 (large) or No. 4 (medium). Minimum yield strength must be 36 ksi.

2.1.18 Submittals Requirements

This applies to SHOP FABRICATED METAL ITEMS also. Submit the following:

a. Detail drawings indicating material thickness, type, grade, and class;

dimensions; and construction details. Include in the drawings catalog cuts, erection details, manufacturer's descriptive data and installation instructions, and templates.

b. Lists of materials, and records which identify the disposition of approved material and fabricated items in the work.

c. Submit three copies of all purchase and mill orders, shop orders for materials and work orders, including all new orders placed by Contractors and old orders extended for each supplier. Furnish, at the time of submittal of shop drawings, a list designating the material to be used for each item. Where mill tests are required, purchase orders must contain the test site address and the name of the testing agency.

Furnish a shipping bill or memorandum of each shipment of finished pieces or members to the project site, giving the designation mark and weight of each piece, the number of pieces, the total weight, and if shipped by rail in carload lots, the car initial and number. Submit

SECTION 05 50 15 Page 12 material records before the beginning of fabrication.

2.2 SHOP FABRICATED METAL ITEMS

Conform shop fabricated metal items to the requirements and details as specified or shown and to the workmanship provisions as specified in Section 05 59 20 FABRICATION OF HYDRAULIC STEEL STRUCTURES, except for the following exceptions/clarifications:

a. All references to AWS D1.5 are to be replaced with applicable provisions of AWS D1.1/D1.1M. If AWS D1.2 and AWS D1.6 have specific requirements for aluminum and stainless steel welding respectively, those override the applicable requirements of AWS D1.1/D1.1M.

Provide complete, detailed fabrication and installation drawings for all iron and steel hardware, and for all steel shapes, plates, bars and strips used in accordance with the design specifications referenced in this section. Before fabrication, obtain necessary field measurements and verify drawing dimensions.

Preassemble items in the shop to the greatest extent possible. Disassemble units only to the extent necessary for shipping and handling. Clearly mark units for reassembly and coordinated installation.

For the fabrication of work exposed to view, use only materials that are smooth and free of surface blemishes, including pitting, seam marks, roller marks, rolled trade names, and roughness. Remove blemishes by grinding, or by welding and grinding, before cleaning, treating, and applying surface finishes, including zinc coatings. Clean metal surfaces free of mill scale, flake rust, and rust pitting before shop finishing.

Provide railing and handrail metal stair system shop drawings with detail plans and elevations at not less than 1 inch to 1 foot. Provide details of sections and connections at not less than 3 inches to 1 foot. Also detail setting drawings, diagrams, templates for installation of anchorages, including concrete inserts, anchor bolts, and miscellaneous metal items having integral anchors.

Use materials of size and thicknesses indicated or, if not indicated, of the size and thickness necessary to produce adequate strength and durability in the finished product for its intended use. Work the materials to the dimensions indicated on approved detail drawings, using proven details of fabrication and support. Use the type of materials indicated or specified for the various components of work.

Form exposed work true to line and level, with accurate angles and surfaces and straight sharp edges. Ensure that all exposed edges are eased to a radius of approximately 1/32 inch. Bend metal corners to the smallest radius possible without causing grain separation or otherwise impairing the work.

Weld corners and seams continuously and in accordance with the recommendations of AWS D1.1/D1.1M. Grind exposed welds smooth and flush to match and blend with adjoining surfaces.

Form the exposed connections with hairline joints that are flush and smooth, using concealed fasteners wherever possible. Use exposed fasteners of the type indicated or, if not indicated, use countersunk Phillips or flathead screws or bolts.

SECTION 05 50 15 Page 13

Provide anchorage of the type indicated and coordinated with the supporting structure. Fabricate anchoring devices and space as indicated and as required to provide adequate support for the intended use of the work.

Use hot-rolled steel bars for work fabricated from bar stock unless work is indicated or specified to be fabricated from cold-finished or cold-rolled stock.

2.2.1 Steel Railings and Handrails

Design handrails to resist a concentrated load of 250 lbs in any direction at any point of the top of the rail or 50 lbs per foot applied horizontally to top of the rail, whichever is more severe. NAAMM AMP 521, provide the same size rail and post. Provide pipe collars of the same material and finish as the handrail and posts.

Steel handrails, including inserts in concrete, provide steel pipe conforming to ASTM A53/A53M or structural tubing conforming to ASTM A500/A500M, Grade A or B of equivalent strength with 2 inch nominal size. Hot-dip galvanize railings.

Fabricate joint posts, rail, and corners by one of the following methods:

a. Flush-type rail fittings of commercial standard, welded and ground smooth, with railing splice locks secured with 3/8 inch hexagonal-recessed-head setscrews.

b. Mitered and welded joints made by fitting post to top rail and intermediate rail to post, mitering corners, groove-welding joints, and grinding smooth. Butt railing splices and reinforce them by a tight-fitting interior sleeve not less than 6 inches long.

c. Railings may be bent at corners in lieu of jointing, provided that bends are made in suitable jigs and the pipe is not crushed.

Provide kickplates between railing posts where indicated, and consist of 1/8-inch steel flat bars not less than 6 inches high. Secure kickplates as indicated.

Galvanize exterior railings, including pipe, fittings, brackets, fasteners, and other ferrous metal components. Provide black steel pipe for interior railings.

2.2.2 Gratings and Cover Plates

Provide grating and cover plates of the material and size shown, and fabricated in sectional panels of the width and length shown, or as appropriate, to accurately fit within the supporting recess frames. Provide openings through panels as shown or as required. Galvanize steel gratings and cover plates after fabrication.

2.2.2.1 Grating

Gratings are as specified in paragraph STEEL GRATINGS. Band edges of gratings and openings through gratings which require the cutting of more than one bearing bar. Provide fasteners of the type recommended by the manufacturer and approved. Provide nonslip nosing on stair tread gratings.

SECTION 05 50 15 Page 14

2.2.2.2 Cover Plates

Provide cover plates as specified in paragraph FLOOR PLATES, PATTERNED.

Provide cover plate panels with holes for insertion of removal tool 1/4 inch bar, flush, drop handles for removal as shown or as required. Remove sharp edges and burrs from plates.

2.2.3 Steel Stairs

Provide steel stairs complete with structural or formed channel stringers, grating treads, landings, columns, handrails, and necessary bolts and other fastenings as indicated. Close exposed ends of stringers and continue around landings which they support. Conform to ASTM A36/A36M for structural steel. Stairs and accessories must be galvanized after fabrication.

Fabricate stair treads and landings of steel gratings of the type specified in paragraph GRATING.

Provide grating treads with slip-resistant nosings. Match the nosings of grating platforms with the nosing of grating treads at landings. Provide toeplates where the open-sided edges of floor grating meet platform framing members. Provide risers for grating treads consisting of a solid plate welded to the trailing edge of tread or landing. Risers must be a minimum of 3/16 inch thick by 4 inches high.

Support steel grating on angle cleats welded to stringers or treads with integral cleats, welded or bolted to the stringer. Close exposed ends.

Form all exposed joints to exclude water.

Provide bolts, nuts and other fastenings as shown and as required for proper installation. Use lock washers under all nuts. Anchor railings of the type specified above in paragraph RAILINGS to stairs as shown.

Design stairs to sustain a live load of not less than 100 pounds per square foot, or a concentrated load of 300 lbs applied over and area of 2 inches by 2 inches where it is most critical. All components to be adequate for the uniform load or the concentrated load, whichever requires the stronger component. Maximum deflection: 1/300 of span under a superimposed live load of 100 PSF. Conform to AISC 360 with the design and fabrication of steel stairs, other than a commercial product. Design, fabricate, and install in compliance with NAAMM AMP 510 and applicable codes with the following classification: Exterior at site structures and equipment:

Industrial Class.

2.2.4 Recess Frames

Fabricate recess frames of structural shapes of the type shown. Grind welded joints in frames smooth. Galvanize steel frames after fabrication.

Anchor frames to supports in the manner shown and not be continuous across contraction or expansion joints.

2.2.5 Ladders

Provide fixed-rail metal ladders conforming to the requirements of EM 385-1-1 and to details shown. Fabricate ladders of structural steel as shown and be galvanized after fabrication. Fabricate ladders of solid-section rod rungs fitted into holes in bar side rails and weld. Make splices in side rails using complete penetration welds and provide a flush and smooth transition between connecting ends. Grind all welds smooth. Weld ladder rails to bent-bar supporting brackets anchored to supporting

SECTION 05 50 15 Page 15 structure as shown.

2.2.6 Ladder Rungs andGrab Bars

Fabricate Ladder rungs and grab bars from steel rods in accordance with the details and be galvanized after fabrication.

2.2.7 Safety Chains

Provide safety chains of galvanized steel, straight link type, 3/16 inch diameter, with at least twelve links per foot, and with snap hooks on each end. Test safety chain in accordance with ASTM A467/A467M, Class CS.

Provide snap hooks of boat type. Provide galvanized 3/8 inch bolt with 3/4 inch eye diameter for attachment of chain, anchored as indicated. Supply two chains, 4 inches longer than the anchorage spacing, for each guarded area. Locate safety chain where indicated. Mount the top chain feet 6 inches above the ground and mount the lower chain 2 feet above the ground.

2.2.8 Surface Finishes

2.2.8.1 Galvanizing and Zinc Repair

Hot-dip galvanize items specified to be galvanized, when practicable and not indicated otherwise, after fabrication. Galvanize in accordance with ASTM A123/A123M, ASTM A653/A653M, or ASTM A924/A924M, as applicable.

Re-galvanize areas where zinc coatings are destroyed by cutting, welding or other causes. Re-galvanize coatings 2 ounces or heavier with a suitable low-melting zinc base alloy similar to the recommendations of the American Hot-Dip Galvanizers Association to the thickness and quality specified for the original zinc coating. Repair coatings less than 2 ounces in accordance with ASTM A780/A780M.

2.2.8.2 Nonferrous Metal Surfaces

Protect by plating, anodic, or organic coatings.

2.2.8.3 Aluminum Surfaces

Before finishes are applied, remove roll marks, scratches, rolled-in scratches, kinks, stains, pits, orange peel, die marks, structural streaks, and other defects which will affect uniform appearance of finished surfaces.