WSP was selected by the U.S. Navy to perform condition surveys and develop plans, specifications, and cost estimates suitable for bid purposes for the repair of deteriorated elements in the conceret Drydock No. 6 at the Puget Sound Naval Shipyard. Repairs were also required for the associated tunnels and pumpwell of the dry dock. State-of-the-art concrete repair materials and construction repair techniques were used in the development of the design with the ultimate goal of extending the useful life of the facility well into the future.
The U.S. Nav's 1,156-foot-long by 180-foot wide by 60-foot-deep Drydock No. 6 was contructed in the early 1960's for servicing vessels in all size ranges, up to an aircraft carrier. Exposure to the marine environment with intermittent wetting and drying over the deaces resulted in a number of deteriorated concrete elements in the dock. Cracking, apparently due to shrinkage of the concrete early in the life of the dock, resulted in extensive delamination and spalling of concrete from the dry dock walls. With walls 60 feet in height, access to perform the condition survey and construction was challenging. Man lifts were required during both design and construction. The WSP team performed an extensive survey to identify the types of defects, their locations, and to quantify areas requiring repairs.
WSP also provided construction support services, including shop drawing review, office consultation, and site visits during construction. WSP also provided on-site quality-assurance/quality control of the repairs by assisting the Navy and the contractor during the construction process.