CONCRETE PUMPING, MINE GROUTING, GEOTECHNICAL
Limestone Storage Silo Foundation
Harrison Power Station, Shinnston, West Virginia
A record-breaking mat pour - one of the largest ever undertaken in the United States - called for Howard crews to pump 16,200 yards of concrete over an area of more than an acre. It was completed, non-stop in just 51 hours—without a hitch!
A serious problem developed when sink holes began to occur in this power plant switch yard. Working in extremely tight conditions and close to 500,000 volt power lines, we used trailer mounted equipment to pump over 20,000 yards of concrete into abandoned mines under the switch yard. We were also called on to do the same in a nearby ash disposal site.
Our crews also placed flowable fill for a series of 200 ft. diameter foundations for thickener tanks and maintained a 15-degree slope angle (±1/2") across the entire foundation of each tank in the process. A flowable fill formulation was used for the foundation of a 1,000 ft. stack and in areas around concrete tunnels.
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