MINGO_BRIDGE_SPECS.pdf

SWAMPWALK

PEDESTRIAN BRIDGE

Mingo National Wildlife Refuge

Stoddard County, Missouri

United States Department of the Interior Fish and Wildlife Service

Infrastructure Management Division Region 3, Bloomington, MN 55437-1458

January 2022

PROJECT MANUAL

Page J - 1

PART III, SECTION J

LIST OF DOCUMENTS, EXHIBITS, AND OTHER ATTACHMENTS

INDEX

TECHNICAL PROVISIONS/SPECIFICATIONS

DIVISION 1 - GENERAL REQUIREMENTS

SECTION 01100 SUMMARY OF THE WORK

DIVISION 3 – CONCRETE

SECTION 03300 CAST IN PLACE CONCRETE

DIVISION 32 – EXTERIOR IMPROVEMENTS

SECTION 32340 PEDESTRIAN BRIDGES

ATTACHMENT

PHOTOGRAPH OF EXISTING BRIDGE & SITE

DIVISION 1 SECTION 01100

GENERAL REQUIREMENTS SUMMARY OF THE WORK

01100-1

PART 1 - GENERAL

1.01 Project Title: Design, fabrication, & delivery of a new

pedestrian bridge for the Swampwalk Nature Trail crossing over Ditch #11 at the Mingo National Wildlife Refuge.

1.02 Work Under These Specifications

The current pedestrian bridge was installed approximately 25 years ago and is currently in need of replacement. The bridge is too dilapidated to repair and is currently closed to the public for safety reasons. This access is needed for visitors to cross Ditch #11 and gain access to the trail portion in Rockhouse Marsh. The goal is to replace the current bridge which will allow visitors to safely observe and photograph wildlife, hike, and experience the wetlands first-hand.

Work includes but is not limited to: The surveying, geotechnical engineering, structural engineering, & civil engineering associated with the design of the bridge and foundations for a proposed pedestrian bridge. The bridge designer shall be required to provide a Professional Engineer (PE) stamped design package. In addition, the contractor shall manufacture, supply, fabricate, and deliver, the proposed pedestrian bridge to the project site.

This contract does not include on-site construction items such as; removal of dilapidated existing bridge, construction of abutments/foundations, and onsite erection of the new bridge.

The bridge structures and all associated designs shall be designed in adherence to AASHTO design guide for bridge structures. Concrete abutments shall be constructed to below frost level and shall meet or exceed the attached concrete specifications. Bridge shall be anchored to the abutments to resist uplift during flooding events. The bridge length is sufficiently long enough that wingwalls are not required.

See below for further breakdown of the scope of work:

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Bridge supplier shall be responsible for:

Surveying, Structural, Geotechnical, & Civil Engineering:

1. Missouri PE Stamped Design & Calculation Package for the Bridges

2. Missouri PE Stamp Design & Calculation Package for the Abutments/Anchors

Manufacturing:

1. Qty (1) 5’ x 92’ Pedestrian Bridge

2. Pratt Truss Configuration or other similar truss configuration

3. Self-Weathering Steel Finish

4. Horizontal railing meeting ADA requirements including height and loading.

5. 2” Thick (min.) Rough-Sawn Treated Timber Decking

6. Pedestrian Loading 90 PSF live load (min.)

7. Freight to project site (two 46’ bridge sections to be connected by onsite contractor)

Site Construction & Bridge Erection (Not In Contract & to be performed by others):

1. Site Grading and Prep for proposed bridge including tree clearing/trimming required.

2. Existing Bridge Removal

3. Layout and surveying.

4. Construction of concrete abutments

5. Unload and Fit Up Bridge for Erection

6. Bridge Erection & Anchoring

7. Expansion Joint Installation

8. Trail restoration & repair upto new bridge abutments

9. Seeding, erosion control, and cleanup.

This work will not be measured for payment and shall be performed on a lump sum basis.

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1.03 Location and Inspection of Site

A. The work site is located at the Mingo National Wildlife Refuge. The mailing address is shown on the Solicitation, Offer, and Award (Standard Forms 1442 or, 18 block 9) as attached to this Invitation. The Refuge Contact person (Ben Mense) may be contacted for further information at the above referenced address or by telephone at (573) 222-3589.

B. All prospective bidders/quoters, contractors, subcontractors, and related persons are encouraged to visit the site(s) of the proposed Work and to assess the location(s) and extent of the Work prior to submitting bids/quotes. Persons may inspect the site by contacting the Refuge contact.

1.06 Items Provided By The Government

A. Unless specifically provided herein, no materials or equipment shall be furnished by the Government under this Contract.

1.08 Site Access and Right of Way

A. The construction access limits on Government property will be established by the Government and the Contractor shall be responsible for complying with these limits and governing all work accordingly.

B. All bidders are reminded that they are responsible for contacting the local entity such as township, county, or state having jurisdiction in the project vicinity to insure bidders/quoters are aware of any requirements of the local entity. These requirements are between the entity and the bidder. Load limits and other restrictions shall be obeyed.

C. Work scheduled on Saturdays, Sundays, Federal Holidays or other than normal working hours shall be approved in advance by the Government.

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D. All equipment and work activities shall comply with OSHA Regulations and all accidents incidental to work performed under this contract shall be reported in accordance with OSHA reporting requirements.

Additionally a copy of the accident report shall be provided to the Contracting Officer.

E. Provide necessary Personnel Protective Equipment (PPE) as identified by SDS and OSHA regulations. Provide documentation, workers have been trained in use of PPE prior to individual use.

PART 2 - PRODUCTS (Not Applicable)

PART 3 - EXECUTION (Not Applicable)

(END OF SECTION 01100)

DIVISION 3 SECTION 03300

CONCRETE CAST-IN-PLACE CONCRETE

03300 - 1

SECTION 03300 - CAST-IN-PLACE CONCRETE

PART 1 - GENERAL (This specification is to be used for design of the bridge abutments and should be considered minimum requirements for the design and construction of the concrete abutments.) The bidder under this contract is not required to do onsite construction of the abutments.

1.1 RELATED DOCUMENTS

A. Drawings and general provisions of the Contract, including General and Supplementary Conditions and Division 1 Specification Sections, apply to this Section.

B. All concrete work not specifically covered by these specifications shall conform to ACI Standard Building Code Requirements for Reinforced Concrete (ACI 318-77).

1.2 SUMMARY

A. Section includes cast-in-place concrete, including formwork, reinforcement, concrete materials, mixture design, placement procedures, and finishes, for the following:

1. Concrete foundations, abutments, piers, walls, pavement, walks, and other misc. flatwork.

B. Related Sections:

1. Division 2 Section "Excavation & Base Aggregates".

1.3 DEFINITIONS

A. Cementitious Materials: Portland cement Type I, IA, III, or IIIA conforming to the requirements of ASTM C-150.

1.4 SUBMITTALS

A. Design Mixtures: The proportions of all components of the concrete mix shall be by weight and shall be submitted for

03300 - 2 approval prior to placement of any concrete. The approved mix design and supplier shall not be changed throughout concrete placement unless a new mix design and supplier are approved.

1. Indicate amounts of mixing water to be withheld for later addition at Project site.

B. Steel Reinforcement Shop Drawings: Placing drawings that detail fabrication, bending, and placement. Include bar sizes, lengths, material, grade, bar schedules, stirrup spacing, bent bar diagrams, bar arrangement, splices and laps, mechanical connections, tie spacing, hoop spacing, and supports for concrete reinforcement.

C. Material Certificates: For each of the following:

1. Cementitious materials.

2. Admixtures.

3. Steel reinforcement and accessories.

1.5 QUALITY ASSURANCE

A. Installer Qualifications: A qualified installer who employs Project personnel who are qualified as ACI-certified Flatwork Technicians and Finishers and a supervisor who is an ACI-certified Concrete Flatwork Technician.

B. Manufacturer Qualifications: A firm experienced in manufacturing ready-mixed concrete products and that complies with ASTM C 94/C 94M requirements for production facilities and equipment.

1. Manufacturer certified according to NRMCA's "Certification of Ready Mixed Concrete Production Facilities."

PART 2 - PRODUCTS

2.1 REINFORCEMENT ACCESSORIES

A. Reinforcing steel bars shall conform to the requirements of ASTM A-615, grade 60, latest revision.

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B. Welded wire fabric shall be fabricated from cold drawn steel wire conforming to either ASTM A-82 (smooth wire) or ASTM A-496 (deformed wire), latest revisions. The wires shall be welded at right angles to form a rectangular grid in accordance with the requirements of ASTM A-185 and A- 497, latest revision. (6x6 W4.0/4.0 min)

2.2 CONCRETE MATERIALS

A. Cementitious Material: Use the following cementitious materials, of the same type, brand, and source, throughout Project:

1. Portland Cement: ASTM C 150, Type I, IA, III, or

IIIA.

B. Normal-Weight Aggregates: ASTM C 33, coarse aggregate or better, graded. Provide aggregates from a single source

1. Maximum Coarse-Aggregate Size: 1 inch nominal.

2. Fine Aggregate: Free of materials with deleterious reactivity to alkali in cement.

C. Water: ASTM C 94/C 94M and potable.

2.3 ADMIXTURES

A. Air-Entraining Admixture: ASTM C 260.

B. Chemical Admixtures: Provide admixtures certified by manufacturer to be compatible with other admixtures and that will not contribute water-soluble chloride ions exceeding those permitted in hardened concrete. Do not use calcium chloride or admixtures containing calcium chloride.

1. Water-Reducing Admixture: ASTM C 494/C 494M, Type A.

2.4 CONCRETE MIXTURES

A. Proportion normal-weight concrete mixture as follows:

1. Minimum Compressive Strength: 4500 psi at 28 days.

2. Maximum Water-Cementitious Materials Ratio: 0.45

3. Slump Limit: 2-4 inches.

4. Air Entrainment Admixture-ASTM C-260

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5. Air Content %: 5-8%

PART 3 - EXECUTION

3.1 FORMWORK

A. Provide clean, sturdy, and suitable forms to ensure concrete is poured to the lines and grades specified.

B. Clean forms and adjacent surfaces to receive concrete.

Remove chips, wood, sawdust, dirt, and other debris just before placing concrete.

C. Coat contact surfaces of forms with form-release agent, according to manufacturer's written instructions, before placing reinforcement.

3.2 STEEL REINFORCEMENT

A. General: Comply with CRSI's "Manual of Standard Practice" for placing reinforcement.

B. Clean reinforcement of loose rust and mill scale, earth, ice, and other foreign materials that would reduce bond to concrete.

C. Accurately position, support, and secure reinforcement against displacement. Locate and support reinforcement with bar supports to maintain minimum concrete cover. Do not tack weld crossing reinforcing bars. Place wire mesh on suitable metal chairs to ensure minimum cover.

D. Set wire ties with ends directed into concrete, not toward exposed concrete surfaces.

3.3 JOINTS

A. Control Joints: Install control joints true to line with faces perpendicular to surface plane of concrete as specified on the drawings.

B. Expansion Joints: Install expansion joints at locations specified on the drawings.

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3.4 CONCRETE PLACEMENT

A. Before placing concrete, verify that installation of formwork, reinforcement, and embedded items is complete and that required inspections have been performed.

B. Do not add water to concrete during delivery, at Project site, or during placement unless approved by Government.

C. Deposit concrete continuously in one layer or in horizontal layers of such thickness that no new concrete will be placed on concrete that has hardened enough to cause seams or planes of weakness. If a section cannot be placed continuously, provide construction joints as indicated. Deposit concrete to avoid segregation.

D. The contractor shall broom finish all concrete.

3.5 CONCRETE PROTECTING AND CURING

A. General: Protect freshly placed concrete from premature drying and excessive cold or hot temperatures.

B. Comply with ACI 306.1 for cold-weather protection.

C. Curing shall be by covering the concrete surfaces with impermeable sheets of polyethylene material with joints lapped and sealed to make watertight. No chemical curing compounds shall be used.

3.6 TESTING

A. Testing Agency: Contractor must engage a qualified independent testing and inspecting agency to perform field tests and inspections and to prepare test reports.

B. Testing Frequency: Contractor shall take concrete cylinders once daily during concrete construction. Air and slump tests shall be taken every 20 cubic yards of concrete placed. All costs for concrete testing shall be included in the contractors bid/proposal.

3.7 FINISHING

A. Formed Surfaces: Immediately after the removal of forms, all bulges and projections on portions of concrete which

03300 - 6 will be exposed shall be removed by chipping or tooling and the surface rubbed or ground. All honeycombed and defective areas shall be chipped out to solid concrete with edges cut at right angles to the surface. All cavities shall be filled with a grout of cement and fine aggregate in the same proportion as the adjacent concrete.

Immediately before filling, the cavity shall be brushed with a slurry of neat cement.

B. Horizontal Surfaces and Slabs: For slabs in wet locations, the Contractor shall be particularly careful to provide an adequate slope to the drains or to suitable points of disposal.

C. Light Broomed Finish: Pavement and walk surfaces shall be floated as specified above followed by steel troweling.

Immediately after completion of trowel finish, the surfaces shall be slightly roughened by brooming with a fiber-bristle brush or a burlap belt in a direction transverse to the main traffic.

END OF SECTION 03300

DIVISION 32 SECTION 32340

Exterior Improvements Pedestrian Bridges

32340 - 1

SECTION 32340 – PEDESTRIAN BRIDGES

PART 1 - GENERAL

1.01 SECTION INCLUDES

A. This section contains requirements for a fully engineered clear span bridge and shall be the minimum standards for design and construction. Clear span length and width of the bridge shall be as specified in the summary of work.

1.02 RELATED SECTIONS

A. The following is a list of specifications which may be related to this section:

1. Section 01100, Summary of Work

2. Section 03300, Concrete

1.03 REFERENCES

A. The following is a list of standards which may be referenced in this section:

1. American Institute of Steel Construction (AISC).

2. ASTM International (ASTM):

a. A36/A36M, Standard Specification for Carbon Structural Steel.

b. A242, Standard Specification for High-Strength Low-Alloy Structural Steel.

c. A307, Standard Specification for Carbon Steel Bolts and Studs, 60,000 psi Tensile Strength.

d. A325, Standard Specification for Structural Bolts, Steel, Heat Treated, 120/105 ksi Minimum Tensile Strength.

e. A490, Standard Specification for Structural Bolts, Alloy Steel, Heat Treated, 150 ksi Minimum Tensile Strength.

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f. A588/A588M, Standard Specification for High- Strength Low-Alloy Structural Steel, up to 50 ksi (345 MPa) Minimum Yield Point, with Atmospheric Corrosion Resistance.

3. American Wood Preservers’ Association (AWPA): P5, Standard for Waterborne Preservatives.

4. American Welding Society (AWS): D1.1/D1.1M, Structural Welding Code –Steel.

5. The Society for Protective Coatings (SSPC): SP6, Commercial Blast Cleaning.

6. Uniform Building Code (UBC).

1.04 SUBMITTALS

A. Submit complete Design DRAWINGS to ENGINEER for review.

B. Submit manufacturer’s certification of compliance with referenced standards.

1.05 QUALITY ASSURANCE

A. Design documents including bridge, abutments, and anchor bolts shall be signed and sealed by a Registered Missouri Professional Engineer.

1.06 DELIVERY, STORAGE, AND HANDLING

A. Coordinate delivery requirements with manufacturer.

B. Comply with manufacturer’s requirements for unloading, lifting, and placement.

PART 2 PRODUCTS

2.01 MANUFACTURERS

A. Potential manufacturer’s of the materials and equipment are

1. Continental Bridges

2. Steadfast Bridges

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3. Bridge Brothers

4. Approved equals meeting specification requirements.

2.02 DESIGN REQUIREMENTS

A. General

1. Bridge shall meet the referenced standards as called for in the following paragraphs. Design documents including bridge drawings, abutment and anchor bolt calculations shall be submitted to the Contracting Officer for approval before fabrication.

2. All allowable design stresses shall be in compliance with the specifications herein and shall be used for the design, fabrication, and erection of structural steel. Required specifications not listed shall be in accordance with the American Institute of Steel Construction (AISC) and Uniform Building Code (UBC).

3. Minimum height of fifty four (54) inches (top of truss top chord).

4. Maximum horizontal opening in railing of nine inches.

5. Unless otherwise required by codes, the minimum loading shall be as follows:

a. Uniform live load of ninety pounds per square foot (90 psf).

b. Concentrated live load of two thousand (2,000) pounds weight on bridge plus thirty percent (30%) impact.

c. Minimum wind load of twenty-five (25) pounds per square foot (psf).

d. Horizontal pressure as if enclosed surface.

e. Railing load of fifty pounds per linear foot (50 lbs/lf) of horizontal load.

f. Seismic design forces shall be included, loading required is based upon project location.

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6. Mounting plates shall allow for thermal expansion.

B. Dimensions and Requirements

1. Length: 92’ (Minimum)

2. Width: 5’ (Minimum) clear unobstructed inside width.

3. Railings: Install railings the full length of bridge. Provide railing with height of 42” in accordance with ADA requirements.

4. Camber: Allowed up to Five percent (5%) of one-half (1/2) of span (if required).

5. Abutments: Bridge to be designed to be set and anchored to reinforced concrete abutments on each end of the bridge. Abutments shall be constructed to below frost level but not less than 60” and shall be designed to carry the bridge loading as required.

Location and elevation of abutments shall be approved in the field by the Contracting Officer (or representative) before construction. Abutments shall be designed for soil bearing capacity of 2,000psf. Onsite contractor shall verify capacity before installing abutments.

6. Decking: All decking shall be secured to the bridge members along the centerline of the bridge with a minimum of four (4) screws per board. Decking shall be pressure treated rough cut pine timbers with a nominal thickness of 2” (min.).

7. Rub Rails: Nominal two-inch by six-inch (2" x 6") wood rub rails on inside of bridge shall be placed forty two (42) inches above the top of the bridge deck. Rub Rails shall be pressure treated pine (S4S).

C. Materials:

1. Metal Fabrication:

a. Material thickness and design of member shall be fully engineered for the length and style of each bridge requirement specified.

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b. Bridge shall be fabricated from high strength low-alloy atmospheric corrosion-resistance ASTM A606 Type 4 steel, self-weathering, (U.S.S. Cor Ten) ASTM A242, or ASTM A588/A588M structural steel shapes and tubing (FY = fifty thousand pounds per square inch [50,000 psi]).

c. Bolts and nuts shall be in accordance with SPECIFICATIONS and for structural joints using ASTM A325 or ASTM A490 bolts. Anchor bolts shall be ASTM A307 or ASTM A36/A36M.

d.E8018 Series electrodes or equivalent shall be used for welding.

2. Wood Decking: Bridge decking shall have nominal two-inch thickness and a minimum width of six inches (2”x6”) and a maximum width of twelve-inches (2" x 12"). Planks shall be made of No. 1 Southern Yellow Pine, selected structural planks or equal. Decking shall be treated with EPA reviewed and registered preservatives such as Alkaline copper quatenary(ACQ) or equal. Decking shall not be finished smooth or otherwise slippery and shall be suitable for walkways. Wood decking shall be “rattle proof” and installed to the greatest extent possible to prevent warping.

2.03 FABRICATION

A. Workmanship, fabrication, and shop connections shall be in accordance with AWS and AISC specifications.

B. All welding shall be done by welders certified for AWS D1.1/D1.1M structural welding requirements.

C. Welding electrodes for self-weathering, corrosion-resistant steel shall have the same weathering characteristics as E5018 or equivalent.

D. All exposed members shall have mill scale removed according to SSPC SP6.

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PART 3 EXECUTION

3.01 Delivery

A. Delivery bridge and decking per manufacturer’s recommendations.

B. Coordinate with local staff for the requirements to Unload bridge and decking at the project site for erection by others.

C. Provide Wood cribbing to properly store materials on site until erected.

END OF SECTION 32340

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NEW BRIDGE LENGTH 92 FEET