| 简介 |
PROBLEM TO BE SOLVED : To dispense with cut-off-agent injection work for ensuring cut-off properties, when an underground penetration body such as an earth-retaining steel material is constructed from an adit (steel-shell element) constructed in ground, and to save construction labor for preparation work, replacement work, etc., associated with work for pressing in the underground penetration body.
SOLUTION : An opening groove 20 along the cross-sectional shape of the earth-retaining steel material 3 is preformed in the part, wherein the steel material 3 is pressed in, of the steel-shell element, and a cut-off device, which is equipped with a cut-off member 23 for closing the opening groove 20, is installed in advance. The earth-retaining steel material to be pressed in is pressed into the ground while the cut-off material 23 is broken, in a state of being connected by means of a joint part 3a of the adjacent already-installed earth-retaining steel material 3, from inside the steel-shell element.
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