| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To prevent a narrow pipe for injection after liquid chemical is injected from being left underground. <P>SOLUTION: An ultra multipoint simultaneous injection method includes: a step of drilling a hole to a prescribed depth while sending water in a casing by using a drilling machine; a step of filling the inside of the casing with a sealant after drilling a hole to the prescribed depth; a step of inserting, into the casing filled with the sealant, a removal type liquid chemical injection pipe for which a sealant cutting and destroying implement with a pull-up core material installed is fixed to the center part of an injection bound narrow pipe for which a plurality of injection narrow pipes are bound and on the distal end side of the plurality of injection narrow pipes, and pulling out the casing; a step of injecting a liquid chemical for ground improvement from the injection narrow pipes of the removal type liquid chemical injection pipe; a step of cutting the solidified sealant by the sealant cutting and destroying implement while pulling out the pull-up core material after the injection of the liquid chemical for ground improvement is completed; and a step of pulling out the injection narrow pipe while discharging the sealant from a tip nozzle of the injection narrow pipe after the pull-up core material is pulled out. <P>COPYRIGHT: (C)2012,JPO&INPIT</p> |
