60 50 00 Railing.pdf

Lower Rio Grande Flood Control Project Rehabilitation of North Floodway (North and South Levees) and Arroyo Colorado Floodway (North Levee) Hidalgo County, Texas

RAILING

USIBWC Contract No.: IBM09B0004 Page 60.50.00 - 1

SPECIFICATION 60 50 00

This specification includes requirements for the installation and construction of railing within the work area, and includes the following:

1.0 General

2.0 Materials & Equipment

3.0 Construction Methods

4.0 Measurement and Payment

PART 1 - GENERAL

1.1 RELATED DOCUMENTS, CONTRACT CLAUSES, & SPECIFICATIONS

The following may not include all related documents, contract clauses, & technical specifications, and does not relieve the Contractor of the responsibility of performing work associated with this specification in accordance with all terms of the Contract herein.

A. Related documents: As described in paragraph 1.2 of SPECIFICATION 01 01 00.

B. Contract: Section I, 52.236-21“Specifications and Drawings for Construction”

C. Technical Specifications:

• SPECIFICATION 60 21 00, “Hydraulic Cement Concrete”

• SPECIFICATION 60 41 00, “Steel Structures”

• SPECIFICATION 60 40 00, “Reinforcing Steel”

• SPECIFICATION 60 42 00, “Metal for Structures”

• SPECIFICATION 60 45 00, “Galvanizing”

• SPECIFICATION 60 46 00, “Cleaning and Painting Steel”

• SPECIFICATION 60 48 00, “Structural Field Welding”

D. References:

• American Society of Testing and Materials (ASTM) A307 - 07b Standard Specification for Carbon Steel Bolts and Studs, 60 000 PSI Tensile Strength

• American Welding Society (AWS) D1.2/D1.2M (2008) Structural Welding Code - Aluminum

• Texas Department of Transportation Test Procedure (Tex) Tex-708-I Sampling Galvanized Metal Products for Coating Weight, November 2004

• Tex-731-I Sampling Cast Aluminum Railing Posts, March 2008

USIBWC Contract No.: IBM09B0004 Page 60.50.00 - 2

1.2 GENERAL

In general, the Contractor shall construct railing of concrete, steel, aluminum, or a combination of these materials, including necessary anchorage for the railing on bridges, culverts, walls, or other structures as shown on the plans.

PART 2 – MATERIALS & EQUIPMENT

2.1 MATERIALS

The Contractor shall use materials that conform to requirements of the following Specifications:

• Specification 60 21 00, “Hydraulic Cement Concrete”

• Specification 60 40 00, “Reinforcing Steel”

• Specification 60 42 00, “Metal for Structures”

• Specification 60 45 00, “Galvanizing”

• Specification 60 46 00, “Cleaning and Painting Steel”

If the plans allow either steel or aluminum options for a particular railing type, furnish either steel or aluminum but not both for the entire Contract

2.2 EQUIPMENT (No Requirements Defined for this Specification)

PART 3 – CONSTRUCTION METHODS

The Contractor shall construct railing in accordance with details, alignment, and grade designated on the plans.

If required, and unless otherwise directed, do not place railing until falsework or formwork, if any, for the span has been released. During construction, ensure that expansion joints in the railing will function properly after the railing is installed.

3.1 METAL RAILING

The Contractor shall provide the following:

A. General. Furnish metal beam rail elements as shown on the plans. Fabricate and erect metal railing according to the pertinent provisions of Specification 60 41 00, “Steel Structures,” and the requirements of this Specification. When required by the plans, prepare and submit for approval the required shop or erection drawings in accordance with Specification 60 41 00, “Steel Structures.” Show all splice locations and details on the shop or erection drawings. Splice members only as provided on the plans. Field weld when required in accordance with Specification 60 48 00, “Structural Field Welding.”

B. Fabrication. Fabricate metal railing and post panels in sections conforming to the details shown in the plans and field-verified lines and grades. Fabricate adjacent sections so that they will

USIBWC Contract No.: IBM09B0004 Page 60.50.00 - 3 accurately engage each other in the field. Match mark each pair of sections so they can be erected in the same position in which they were fabricated. Fabricate metal rail elements included as part of the railing system to the dimensions and cross-sections shown on the plans and within a tolerance of 1/4 in. per 10 ft. in the straightness of either edge. Joint and connect metal rail elements to the rail posts as shown on the plans, lapping metal rail elements in the direction of traffic in the adjacent lane. Unless otherwise shown on the plans, bolts and nuts for metal railing should meet requirements of ASTM A307 and be galvanized in accordance with SPECIFICATION 60 45 00, “Galvanizing.” Fabricate aluminum in accordance with AWS D1.2, Structural Welding Code—Aluminum. To facilitate bending or straightening, aluminum materials other than castings may be heated to a temperature up to 400°F for no more than 30 min.

C. Castings. Provide permanent mold castings of the materials specified that are true to pattern in form and dimensions and of uniform quality and condition. Castings must be free from cracks and defects such as blowholes, porosity, hard-spots, or shrinkage that could affect their suitability for use. Repair minor defects in aluminum castings by an approved inert gas-welding process.

Ensure that finished castings are free of burrs, fins, discoloration, and mold marks and that they have a uniform appearance and texture. Produce castings under radiographic control sufficient to establish and verify a product free from harmful internal defects. When heat-treating is required, heat-treat the entire lot of castings to the specified temper. Permanently mark the heat or lot number on the web or top of the base of all castings. Furnish mill test reports showing the heat or lot number, chemical composition, tensile strength, elongation, and number of pieces for each casting heat or lot. For aluminum castings, a heat or lot should consist of not more than 1,000 lb.

of trimmed castings when produced from batch type furnaces, or 2,000 lb. when produced from a continuous furnace during a period of no more than 8 consecutive hours. Furnish the entire number of acceptable posts cast from each heat or lot except when a portion is required to complete a project.

D. Corrosion Protection. Provide protective coating for all metal railing unless otherwise noted on the plans. Galvanize all portions of steel railing after fabrication in accordance with SPECIFICATION 60 45 00, “Galvanizing,” unless otherwise noted on the plans. When painting is specified on the plans, provide the paint system shown on the plans. Apply paint in accordance with SPECIFICATION 60 46 00, “Cleaning and Painting Steel”, and repair any damaged galvanizing after erection in accordance with SPECIFICATION 60 45 00, “Galvanizing”.

Aluminum railing and galvanized steel railing do not require field painting. Before final acceptance, clean extrusion marks, grease, and dirt from the railing.

E. Storage. Store railing materials above the ground on platforms, skids, or other supports, and keep them free from grease, dirt, and contact with dissimilar metals. Avoid scratching, marring, denting, discoloring, or otherwise damaging the railing.

3.2 CONCRETE RAILING

The Contractor shall provide concrete portions of railing in accordance with the requirements of SPECIFICATION 60 20 00, “Concrete Structures,” and requirements herein; construct forms so that the railing line and grade can be checked after the concrete has been placed but before initial set; do not

USIBWC Contract No.: IBM09B0004 Page 60.50.00 - 4 disturb the form alignment during finish floating of the railing tops; exercise particular care in other construction to avoid disturbing or vibrating the span with the newly placed railing.

Concrete railing may be constructed using approved slip-form equipment; provide sensor control for both line and grade.

3.3 TESTS

The COR will sample cast aluminum posts for testing in accordance with Tex-731-I to verify the material requirements of SPECIFICATION 60 42 00, “Metal for Structures.” If required, metal beam rail elements may be sampled in accordance with Tex-713-I. The COR may sample bolts and nuts in accordance with Tex-708-I for galvanized coating testing.

PART 4 – MEASUREMENT AND PAYMENT

For this project, the Work performed by the Contractor under this specification shall not be paid for directly, but shall be considered subsidiary to SPECIFICATION 60 23 00.

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