| 摘要 |
PURPOSE:To improve and fortify soft ground with consumption of lesser amounts of resources and without pollution by a method in which a pit is excavated in soft ground, and a liquid for coagulating soft sand gels and compressed air are stepwise injected into the pit by a shot method and hardened in a combined sand soft gel state. CONSTITUTION:A pit is excavated in soft ground by the drill bit 18 of a double tube rod 9, using a drill aid liquid (high-temperature hot water) to raise the temperature of the ground. During the period when two kinds of quick-setting groups are passed under pressures, a liquid for coagulating soft sand gels and compressed air are stepwise injected by a shot method while making allowance for its expandibility, and hardened in a state of veinal branch and fissured sand soft gels. Soft ground can thus be forcibly improved and fortified without pollution only for limited regions at low cost and with consumption of lesser amounts of resources. |
