Mcnary Navigation Lock Downstream Gate Gudgeon Anchor Replacement

Seeking sources for a construction project entitled: McNary Navigation Lock Downstream Gate Gudgeon Anchor Replacement: roposed work is located at McNary Lock and in Umatilla, Oregon. The work will be for the McNary downstream gate that was placed in service in 1954. The downstream gate is a two-leaf arched miter gate that measures 106 feet tall by 86 feet wide and each gate leaf weighs approximately 400-tons. The existing gudgeon anchors have exceeded the recommended fatigue life and are programmed for full replacement in a 2024 extended navigational lock outage. USACE installed permanent instrumentation in 2019 to monitor the overall health of the gate and gudgeons. The work involved includes the replacement of all four imbedded gudgeon anchors and mechanical linkages to fit up to the existing gate. New post tensioned anchor rods will be installed by drilling or coring to provide aligned holes with backer plates and transition plates that engage the concrete monolith to support the weight of the operating miter leaf gates. The post tensioned rods will be connected by a new five-point gudgeon pin system and mechanical linkages. The new gudgeon five-point linkage will be designed to support the existing miter leaf gates as well as the new replacement gates planned as a future contract. The components for this project are drilled/cored aligned holes, post tensioning rods, mechanical linkages, work within tight scheduled outages, and inclement winter weather conditions.

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, Dam Construction and Equipment.