713 - Bridge Rehabilitation, Steel

713 Bridge Rehabilitation - Steel 2012 STANDARD SPECIFICATIONS FOR CONSTRUCTION - SECTION 713

GENERAL

Shop Plans

See Section 707 of this manual.

Furnishing and fabricating structural steel additions and replacements for existing structures and for steel portions of temporary supports shall be according to Section 707. Shop drawings shall be submitted for approval prior to fabrication. See Section 713 of the Standard Specifications for Construction.

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Retrofit Structural Steel

See Section 713 of the Standard Specifications for Construction.

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CONSTRUCTION

Temporay Supports for Girder Ends

Temporary supports for girder ends may either be as shown on the plans or an alternate design proposed by the Contractor and approved by the Engineer.

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Column-Type Supports and Suspension-Type Supports

See Section 713 of the Standard Specifications for Construction.

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Pin and Hanger Replacement

Measurement and Removal of Existing Hangar Assemblies - see Section 713 of the Standard Specifications for Construction.

Installation and Coating of New Hangar Assemblies - see Section 713 of the Standard Specifications for Construction for Installation and Coating of New Hanger Assemblies.

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Bearing Stiffeners at Temporary Supports

See Section 713 of the Standard Specifications for Construction.

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Sealing the Perimeter of Beam Plates

The sealant shall be applied around the perimeter of bolted or riveted plates or angle on a steel beam as directed by the Engineer. Apply the sealant over the epoxy intermediate coat when dry to the touch. The top coat shall be applied over the sealant when the intermediate coat is fully cured. The surfaces between the repair plate or angle and the beam and the surfaces in contact with the sealant shall be clean and dry at the time of application. The sealant shall not be applied when the air or surface temperature is below 40°F (5°C). Immediately after the sealant is applied, it shall be tooled to form a 5/16 inch fillet and to force it against the contact surface. Sufficient sealant shall be applied to completely fill all pits and depressions regardless of width and depth in the steel beam at the seam line.

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