05520 Handrails and Guardrails.pdf

Standard Drawings for Doppler (VHF)

Omni Directional Range (DVOR) Counterpoise June 2020

HANDRAILS AND GUARDRAILS 05520-1

SECTION 05520

HANDRAILS AND GUARDRAILS

PART 1 - GENERAL

1.1 Work Included: Furnish labor, materials, equipment and incidentals necessary to install guardrails, handrails, stair railing and toe-guards.

1.2 Related Work Covered Elsewhere:

Cast in Place Concrete Section 03301

Miscellaneous Metals Section 05500

1.3 Quality Control:

A. Suggested Manufacturers: Aluminum handrails by the following Manufacturers that comply with these specifications will be acceptable:

1. Julius Blum & Co., Inc.

2. Architectural Art Manufacturing Company, Inc.

3. Rocky Mountain Railing

4. Thompson Fabrication Company

5. Reynolds Aluminum

B. Design Criteria: Guardrails and handrails shall be designed to resist a concentrated load of 200 pounds applied to the top rail at any point and in any direction. Deflections resulting from such stresses shall not be permanent.

C. Style: Handrails and guardrails shall be multi-rail type. The number of rails shall be as indicated on the plans, or as required by local codes or OSHA requirements. Railings accessible to the public shall be designed so that the clear spacing between horizontal rails or the distance between vertical members on picket-type railings shall not exceed 6", except 4" at exit stairs. Returns and rail extensions beyond end of stairs shall comply with OSHA and Fed Std 795 "Uniform Federal

Accessibility Standards".

D. Tolerances: The railing system shall be installed to the following tolerances:

1. Maximum variation from plumb 1/4"

2. Maximum offset from alignment 1/4"

1.4 Submittals: Submittals shall be in accordance with general requirements and shall include:

A. Certification of compliance with local, state, and Federal codes, and OSHA requirements.

B. Shop drawings indicating railing layout, methods of assembly, attachments, anchorage types, and expansion joints.

1.5 Standards and References: The applicable provisions of the following standards shall apply as if written here in their entirety:

ASTM A-36 Specification for Structural Steel

ASTM A-53 Specification for Pipe, Steel, Black and Hot-Dipped, Zinc-Coated Welded and Seamless

ASTM B-221 Specification for Aluminum-Alloy Extruded Bars, Rods, Wire, Shapes, and Tubes

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ASTM E-894 Standard Test Methods for Anchorage of Permanent Metal Railings and

Rails for Buildings

ASTM E-985 Specifications for Permanent Metal Rails for Buildings

ANSI A 21.1 Safety Requirements for Floor and Wall Openings, Railings, and Toe

Boards

AWS Structural Welding-Code

OSHA 29 CFR 1910 Occupational Safety and Health Standards

UBC, 1991 Uniform Building Code

1.6 Job Conditions:

A. The SubSubcontractor shall be responsible for taking complete field measurements of all areas scheduled for guardrails or handrails to assure a proper fit to field conditions.

B. Provide any concrete inserts required by the railing anchorage.

C. Provide handrails at both sides of stairs. Where sides of stair consists of a solid wall, a single handrail may be provided along with handrail brackets to anchor handrail to wall surface. Provide backup blocking at drywall partitions.

PART 2.00 PRODUCTS

2.1 Materials:

A. Steel Pipe: I.P.S. Schedule 40 steel pipe conforming to ASTM A-53. Sizes are shown on drawings for different locations.

B. Toe Boards: Extruded aluminum alloy 6063-T52, conforming to ASTM B-221 and ASNI A12.1.

C. MECHANICAL FASTENERS: Furnish mechanical fasteners as recommended by the manufacturer for the following conditions:

1. Stainless steel RHMS 1/4", 20" x 1" SEMS with lock washers.

2. Stainless steel 1/4", 20 RHMS with nut.

3. Aluminum, internally threaded, tubular rivets

4. Cadmium-plated sleeve anchor bolts, 3/8" x 3".

D. Structural Adhesive: An approved epoxy adhesive, as recommended by the railing manufacturer, such as 3M "SCOTCH-WELD", or approved equal.

E. Post Setting Epoxy: Silicone Specialties "E-Bond #165", Sika Corp. "Sikador Hi-mod", or approved equal.

F. Steel Anchor: Anchor and other appurtenances shall conform to ASTM A-36.

G. Welding Electrodes: Conformed to AWS Code.

2.2 Finish: Finish for interior exposed steel handrails shall be painted as per color schedule. Steel handrails, exposed to the exterior shall be fabricated of galvanized steel.

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2.3 Welded Steel Railings:

A. Steel handrails and guardrails shall be fabricated of I.P.S. Schedule 40 steel pipe with all welded construction. Cut pipe intersections to the diameter of the connecting pipe and weld all around the connections. Posts shall be truly vertical and shall be welded to steel stair stringers all around the pipe diameter shop welded to a steel base plate, as indicated. The steel pipe diameter is 1 1/4" or 4" as shown on the drawings.

B. Furnish fabricated welding type fittings, including end terminals which curve and anchor to the wall, pipe end terminals, bases, wall brackets, and wall flanges. Railings shall have rounded corners and returns using flush welded fittings.

PART 3 - EXECUTION

3.1 Preparation: Install sleeves and anchor plates in concrete as it is placed.

3.2 Installation:

A. Post spacing shall not exceed maximum spacing required by local or state codes, or OSHA requirements, or 8'-0" centers; whichever is less. Handrail posts at stairs shall be spaced as required to produce uniform spacing between posts.

B. Provide extensions at both ends of the stair terminals, in accordance with OSHA requirements.

Extend wall mounted handrails a minimum of 12" beyond the end of the stair. Handrails at stairs shall have a height as shown on drawings. Guardrail heights shall be 3'-6". Make smooth radius transitions between the stair rails and guardrails. Transitions from horizontal rails to sloping rails and terminations at ends of railing shall have rounded corners.

C. Install toe boards between posts at locations indicated on the plans or required by OSHA. Toe boards shall be shipped in 4' lengths and cut to fit in the field. Attachment shall allow the metal to expand and contract. Splices shall occur only at vertical posts.

D. Provide splices and expansion joints, each having an internal splice connector. Install expansion joints according to the Manufacturer's recommendations. Expansion joints shall be free to move on one side and shall not exceed intervals of 25' on straight runs.

E. Apply one (1) coat of zinc chromate or bituminous paint with a minimum thickness of 10 mils dry film thickness at railing components in contact with concrete or dissimilar materials.

F. Welded systems shall have all joints welded continuously around each juncture with small, uniform welds. Steel welded pipe shall have welds ground smooth. Aluminum welds, if neatly made and uniform in appearance, need not be ground, except when appearance is a factor and welds are not made neatly and smoothly as determined by the Subcontract Administrator.

G. Provide a 3/16" stainless steel safety chain attached to an eye-bolt at the vertical post, where indicated on the plans. Provide a spring loaded clip at the opposite end.

H. Provide 3/16" diameter weep holes located 1/4" to 3/4" above the grout line at exterior posts set in grout or concrete.

I. Painting: Steel handrails shall be painted as specified in Section 09901, Painting, Galvanized steel handrails do not require painting.

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END OF SECTION