This work consists of shop fabrication, shop assembly, field erection and alignment of the steel Dutch-style bascule span, consisting of the bascule leaf, balance frame, counterweight box, link arms, towers, and associated mechanical components, shown in the Plans and as described herein. Develop and implement procedures necessary to obtain accurate alignment of the bascule span components to the specified tolerances. Align the structural steel components, bascule leaf heel trunnions and balance frame trunnions, hydraulic cylinder upper and lower clevises, and link arm upper and lower clevises. Design, detail and implement temporary supports, tie-downs/tie-backs, falsework, shoring, jacking, and procedures to safely erect the bascule span. Review and approval, by the Engineer, of procedures, design and details of temporary supports, tiedowns/tie-backs, falsework, shoring, and/or jacking systems is for compliance with the minimum requirements of the Contract Documents and should not be considered relief of the Contractor’s responsibilities for satisfactory alignment and safe erection of the bascule span. Perform shop fabrication, shop assembly, field erection, and alignment of the bascule span structural steel in accordance with the provisions herein, the Plans, approved Shop Drawings, Standard Specifications Sections 604 and 615, Special Provision 615503 - Bridge Mechanical System, AASHTO/ANSI/AWS D1.5 Bridge Welding Code, and the approved procedures. Perform bascule span shop fabrication and shop assembly by a shop certified under the 2014 AISC Quality Certification program, meeting the requirements of Certified Bridge Fabricator – Advanced (ABR) and AISC Fracture Critical Endorsement.
