| 摘要 |
PROBLEM TO BE SOLVED: To surely perform water cut-off in a box buried area and its peripheral area and to perform cut-off processing by comparatively easy and quick construction in a box jacking construction method using roof protecting construction. SOLUTION: A box-shaped roof of an upper corner part of a portal roof protecting construction 3, which is formed by a box-shaped roof 2 of a square steel tube or the like penetrating across a buried section under a road in the ground is formed as a large-sized roof 10 larger than an ordinary diameter, and before the box-shaped roof 2 is pushed forward and buried, a chemical is injected from the interior of the large-sized roof 10 into the ground through an opening 11, three cut-off walls 12, for example, are constructed in an installation place for the box-shaped roof 2 by soil improvement, and in addition to the soil improvement by horizontal boring chemical feeding construction method from a pit, a box buried area A is surrounded by the cut-off walls 12, whereby in the case of a sand ground, when there is an underground buried material under the road, and in the case of construction below the groundwater level, cut-off of water can be made reliable, so that a tunnel can be constructed safely and quickly. COPYRIGHT: (C)2009,JPO&INPIT
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