A two-segment mandrel actuated by a hydraulic cylinder pulling on cables which pass over sheaves in a manner to force the two segments apart to hold a corrugated shell for driving.
Go Devil
Plug-like device placed in a tremie pipe prior to placement of concrete in the pipe. Device is intended to prevent concrete from mixing with bentonite slurry or water during initial placement of concrete. Typically formed of foam rubber or polystyrene
French: furet/scraper
Go-For / Gopher
The low man or woman on the construction crew who goes for parts, supplies, or tools, as instructed.
Gow Caisson
A short cylinder of steel plate large enough for a man to work inside; as excavation proceeds, smaller cylinders are set inside until bearing stratum is reached. The telescoped cylinders are withdrawn as concrete is placed.
gpm or gph or gpd
Gallons per minute, hour or day. A unit of measurement of the flow of liquids.
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