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Rail AREMA Timbers and OTM


Location
Maine
Publication Date
01/06/2020 06:21 AM EST
Closing Date
01/17/2020 04:00 PM EST
Issuing Organization
State of Maine - Department of Administrative & Financial Services (DAFS)
Solicitation Number
Description

Specifications include, but are not limited to: scription This work shall include all Timber materials, including ties, timber bridge spacers, backwall timbers as shown on the Plans and described in this Specification Materials A. Timber. All ties and timbers shall be solid-sawn and treated Southern Pine (5”x5” or larger) or Douglas Fir (beams and stringers) Grade No. 1 or better. All ties and timbers shall meet the requirements of Chapter 7, Section 1.7 “Specifications for Timber Bridge Ties” of the AREMA Manual. All ties and timbers shall meet or exceed the allowable unit stress values for wet conditions, visual grading shown in AREMA Table 7-2-9. Bridge ties shall be surfaced two sides (s2s) on the top and bottom sides, and dapped (notched) on the bottom side as shown in the Plans. B. Preservative Treatment. All timber shall be Dual treated with 1# Borate and 6# Creosote preservative in accordance with the requirements of Chapter 30, Section 3.6 “Wood Preserving” and Section 3.7 “Specifications of Treatment” of the AREMA Manual. Minimum creosote preservative retention shall be 6 pounds creosote per cubic foot of timber for all members. The preservative treatment to be used shall be Borate/Creosote as outlined above. Submittals and Fabrication Requirements Written certification shall be submitted including treatment reports demonstrating that the timbers and ties meet the species, grading, and treatment requirements of this Specification. Holes for bolts connecting bridge ties to top flanges shall be prebored during fabrication and before treatment of the bridge ties. Prebored holes shall be 1/16” larger than the diameter of the bolt. Bridge tie to top flange connectors shall be installed in accordance with the manufacturer’s instructions. Holes for all lag screws shall be predrilled with a bit not larger than the body of the screw at the base of the thread. Each bridge tie shall be permanently tagged identifying the respective bridge number and dapping pattern. Ties, timbers, and associated hardware shall be grouped and packaged for delivery to each individual bridge. Anti-splitting gang nail end plates shall be installed on the ends of all bridge ties. End plates shall meet all of the applicable requirements of Chapter 30, Section 3.1.6 and Section 3.1.7 of the AREMA Manual. End plates shall cover a minimum of 75% of the end are of the tie, shall be 18-gauge galvanized steel and shall have teeth extending at least 3/8 inches beyond the end of the plate. End plates shall be installed centered on the end of each tie and fully driven with no evidence of excessive bending or mashing of teeth.

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