| 摘要 |
<p>PURPOSE:To make easier the exchange of a quick-setting grout and a permeable grout by a method in which a mixture of water glass and a reactant is injected into the ground through one of paths of an injection pipe, and carbon dioxide gas is blown into the other of the paths so as to quickly harden the grout. CONSTITUTION:An injection pipe consists of an outer tube 1 with a check valve 10, an inner tube 2 with a check valve 4 and a closing valve 8, and upper and lower discharge ports 7 and 6. The ground is bored by sending water through the outer tube 1 and then a mixture liquid of water glass and a reactant is charged from the outer tube 1, whereupon the mixture liquid pushes and opens the check valve 10 and is injected into the ground through the lower discharge port 6. Then, carbon dioxide gas is blown into the inner tube 2, whereupon the check valve 4 and the closing valve 8 are pushed up, the carbon dioxide gas is blown into the mixture liquid to form a quick-setting grout, and the grout is injected into the ground through the upper discharge port 7.</p> |
