| 摘要 |
PURPOSE:To solidify the super-soft ground by injecting hot water and compressed air to a triple pipe rod with a bit, boring the super-soft ground and injecting hot-water diluted liquid chemicals for solidification of a different kind and compressed air into the ground from the rod. CONSTITUTION:The super-soft ground 2 is bored by the triple pipe rod 5, to a nose thereof the bit 9 is set up, while hot water at approximately 55-75 deg.C and compressed air in approximately 4.5-7.0 are supplied as boring auxiliary liquid materials on boring, and the ground is bored. The mixed solidifying agent 10 of the liquid chemicals for solidification in which a liquid A such as water glass and a liquid B consisting of sodium bicarbonate and acidic Glauber's salt are each diluted by hot water and compressed air is injected into the soil 3, a temperature thereof is elevated and which is warmed previously, from the bit 9 of the rod 5, and changed into soft-sand gel. The solidifying agent 10 is permeated into voids in the soil 3 of the ground 2 in a vein-branch shape or a split and cleavage shape. Accordingly, the super-soft ground can be improved at low cost. |
