Wanapum Dam, Beverly
Stabilisation and repair of the hydroelectric Wanapum dam.
01/03
Context
Context
In February 2014, a 20 metre long, 5 cm wide crack was found on the upstream side of a pier in the spillway of the Wanapum dam in Washington State. As an emergency measure, the Grant County Public Utility District, which operates the dam, lowered the level of the reservoir by eight metres to reduce pressure on the structure.
location
Washington, United States
Owner
Grant County Public Utility District
Engineer
MWH
General contractor
Kuney Goebel JV
In May 2014, it awarded the contract to repair the dam to Soletanche Bachy’s North American subsidiary Nicholson Construction. Nicholson began by coring the dam from the drainage gallery to map the crack. It then installed 35 vertical anchors with a maximum capacity of 1,000 tonnes on each of the 13 dam piers to stabilise the dam and reinforce the spillway.
This part of the project was completed in November 2014 following 10 months of uninterrupted work. It ended with the installation of uphole drains in the gallery, drilling, installation of 69 bars on the ogee and injections to plug the crack.
Soletanche Bachy
Soletanche Bachy is a world leader in foundations and soil technologies, operating in 60 countries via a network of 80 subsidiaries and branches. The Group delivers the full range of geotechnical processes and provides innovative, effective solutions as either a lead or specialist contractor for turnkey projects with a geotechnical focus or specialist works.
a subsidiary of
Soletanche Freyssinet
Soletanche Freyssinet