| 摘要 |
<p>PROBLEM TO BE SOLVED: To facilitate back filling work of a vertical hole by forming a waterproof wall so as to enclose a buried material exposed in a vertical hole which is opening- formed in the ground from a lower side and a side, taking a mud body formed by mixing water and hardener with the soil into a space enclosed by the waterproof wall, and re-burying a buried soil into the vertical hole after the mud material is hardened. SOLUTION: A waterproof layer 2 is formed around a piping P of inner wall surfaces 1a, 1b of a vertical hole 1 on which the piping P is exposed by means of waterproof coating. After that, a support frame body 5 is provisionally arranged on both sides of the piping P, and a waterproof sheet 3a is covered along both sides and a lower side of the piping P while supporting it to a supporting frame body 5 so as to form a waterproof wall 3. Both end parts in the longitudinal direction of the waterproof sheet 3a abut on the waterproof layer 2 formed on inner wall surfaces 1a, 1b, sealing-treatment of its contact part is carried out, and a waterproof space 4 is sectioned. A mud material 6 formed by mixing the soil, water, and hardener at a prescribed rate beforehand is taken into the waterproof space 4. After the mud body 6 is hardened, the supporting frame body 5 is removed, and a clearance part of the vertical hole 1 is filled back with burying soil.</p> |
