Hydraulic Steel Structure Fabrication of Vertical Lift Gate, Emergency Gate, and Service Gate

Description of Requirement: Work will consist of the following: fabricate, assemble, paint, and deliver two hydraulic steel structures. The work will primarily consist of two tasks: 1) fabricating and assembling gate structures; 2) shipment to the project. All work will be performed in accordance with the contract drawings and specifications. Work also involves preparing final “As-Built” documents. Falls Lake Dam emergency gate is a hydraulic steel structure and is classified as a vertical lift gate with dimensions 19-feet 10-inches in height and 9-feet 9-inches wide. The Falls Lake Dam service gate is a hydraulic steel structure and is classified as a vertical lift gate with dimensions 19-feet 8-inches in height and 9-feet 3-inches in width. The service gate has an attached 1-foot by 1-foot piggyback gate. The gates are constructed of structural steel members with skin plate on one side, seals and, a 45-degree bottom gate lip for hydraulic efficiency. Side and top seals are J-type rubber seals, and the bottom seals are rectangular. Six 16-inch diameter fixed wheels are mounted on cantilever axles on each side of each gate. The weight of each gate is approximately 17,000 pounds. Delivery shall be made to Falls Lake Dam located in Wake County North Carolina. Due to the critical nature of these structures and the specified framing arrangement many of the structural members are "Fracture Critical", therefore, all welding is required to be performed to AWS D1.5M/D1.5 welding code standard by a steel fabricator certified under the AISC Quality Certification Program, Category CBR (Major Steel Bridge) with a Fracture Critical Endorsement (F) or the new AISC Certification Program for Steel Bridge Fabricators (AISC 205-11) for "Intermediate Bridges" (IBR) meeting supplemental requirements for "Fabricators of Bridges with Fracture-Critical Members" (FC).

Dam/Tunnel, Renovation.

Division 02 -	Existing Conditions, Subsurface Investigation.
Division 31 -	Earthwork, Site Clearing, Grading, Excavation and Fill, Subgrade Preparation, Excavation, Shoring, Tunneling and Mining, Tunnel Excavation.
Division 35 -	Waterway and Marine Construction, Waterway and Marine Construction and Equipment, Hydraulic Gates, Hydraulic Vertical Lift Gates, Dam Construction and Equipment.