PURPOSE: To prevent the cave-in of the surface layer of ground as well as the degradation of a space formed for setting artificial ground by packing a grout into the upper part of an artificial ground to form a solidified portion in advance in the formation of an artificial ground under the ground by a reverse construction work.
CONSTITUTION: Excavation is made until the upper depth of an aritificial ground 32 to be formed by a reverse construction work, and then a reverse pipe 6 is rotationally lowered while jetting superhigh-speed water and compressed water from a nozzle 18 to form the first space 22. Then, while rotationally raising the reverse pipe 6, a grout 23 is injected into the space 22 to fill it with the ground so as to form a solidified portion 25 in the upper part of the artificial ground 32 to be form. Then, the second space 28 as part of the space where the artificial ground 32 is to be set is formed below the solidified portion 25, and grout 30 is injected into the space 28 to form a solidified portion. These processes are orderly repeated to form the artificial ground 32.
MITSUI CONSTR
NIT CO LTD
| JPS5532848A | 1980-03-07 | |||
| JPS5139764A | 1976-04-02 |