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Class Information
Number: 405/247
Name: Hydraulic and earth engineering > Foundation > Columnar structure (e.g., pier, pile) > Process or apparatus for installing > Driving removable wall supporting core > Diametrically retractable core > Fluid pressure actuated
Description: Method or apparatus wherein a liquid or gas under pressure is employed to change the diameter of the core.

Patents under this class:

Patent Number Title Of Patent Date Issued
6923599 In-ground lifting system and method Aug. 2, 2005
6863475 Apparatus for injecting fluids Mar. 8, 2005
4826357 Device for the internal occlusion of tubular foundation piles May. 2, 1989
4430024 Hydraulically operated mandrels Feb. 7, 1984
4426175 Method of and apparatus for reinforcing piling structure and improved precast concrete pile suitable for use in said method Jan. 17, 1984
3984992 Pile driving mandrel Oct. 12, 1976

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