WORKING TOOL AND METHOD FOR PROFILED PIT FORMING Russian patent published in 2006 - IPC E02D7/20 E02D17/02 

FIELD: building, particularly to form pits for foundation building in weak and sedimentary ground in densely built-up urban areas.

SUBSTANCE: working tool comprises coaxial working shells provided with support members extending along lower edges thereof. The working tool also has head installed over upper parts of working shells, as well as guiding shell coaxially arranged in the working shells and abutments secured to support members of working shells. The guiding shell comprises abutment of predetermined profile. Each working shell abutment has thickness equal to distance between the shell provided with this abutment and neighboring inner shell. Each working shell abutment has the same profile as guiding shell abutment. Method of pit forming involves pressing guiding shell in ground; driving working shells in ground coaxially to guiding shell, wherein number of shells, shape and shell dimensions are selected from pit geometry and ground characteristics.

EFFECT: reduced labor inputs and costs of profiled pit forming, reduced dynamic load on buildings and structures built in proximity to the pit.

9 cl, 5 dwg, 1 ex