Shaft excavation method

Details Shaft excavation method Shaft excavation method

1989-10-16

1990-08-21

Bui, Thuy M.

Mining or in situ disintegration of hard material

Processes

Forming blocks

125 21, 299 35, B28D 108, E21C 4112

Patent

active

049500341

ABSTRACT:
A method for sinking a shaft having a wide diameter e.g. 4 meters. A concrete diaphragm wall is formed with five radially inwardly extending sections (12), in each of which a guide hole (13) is formed. Five outer boreholes are drilled to depth using the guide holes and a central borehole (14) is also drilled to depth. The ground within the wall is excavated to rock level. Vertical cuts are made between adjacent outer boreholes (14) and between the central borehole (14) and the outer boreholes (15) using a wire (19) saw cutter. Cross cuts are then made to form separated segments (33) of rock which are removed sequentially. This is repeated progressively downwards to the required depth.

REFERENCES:
patent: 1967117 (1934-07-01), Gerdetz
patent: 4832411 (1989-05-01), Johnston et al.

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