| 摘要 |
<p>PURPOSE:To surely seal the portion to be sealed through only injecting sealing material into the portion by mixing aggregate into the resin material which expands its volume during hardening reaction. CONSTITUTION:Sealing material is made by mixing hydrophilic urethane resin or the like, which is hardened by reaction with water and expands its volume through foaming, and sand or the lie, which serves as aggregate. Mixing ratio of these urethane resin and the sand is, for example, about 1:2 in volume. Water, which contributes to the reaction of the urethane resin, is supplied from water included in the sand by about 3%. Near a gas leakage portion of a buried pipe P such as a gas pipe and the like buried in soil, a hollow space 1 is formed. After the hollow space 1 is formed, a sealing material injecting apparatus 3 is inserted into vertical holes 2, and the sealing material 4 is filled by injecting it into the hollow space 1.</p> |
