| 摘要 |
PROBLEM TO BE SOLVED: To enable a vertical shaft to be configured without having a person enter the vertical shaft when configuring the vertical shaft using a press-in construction method, by enabling assembly work for a cylindrical liner plate body (an earth retaining wall body) to be performed at an excavation position of the vertical shaft and from outside the liner plate.SOLUTION: An outside planar liner plate 1 includes a circular arc liner plate 3, and a planar member 2 fitted on an outer side of the circular arc liner plate. The liner plate 3 includes a fitting part (a notch 5) for the planar member at top and bottom positions on the outer side thereof. The planar member 2 includes an axial direction length L covering at least a corrugated part of the liner plate, and a peripheral direction length M that covers a part or a whole in the peripheral direction on the outer side of the liner plate, and furthermore includes a fitted part 7 (a hook part) to be fitted detachably with the fitting part 5 for the planar member at top and bottom positions of the liner plate, the fitted part being provided on top and bottom positions on an inner side.SELECTED DRAWING: Figure 4 |
