| 摘要 |
<P>PROBLEM TO BE SOLVED: To shorten a construction period and to reduce a construction cost by excellently injecting an injection material to the ground, forming a desired excellent solid improvement body in the ground, also suppressing injection pressure when injecting the injection material and accelerating an injection speed of the injection material to the ground in a ground improvement construction. <P>SOLUTION: In an injection material injection structure in ground improvement, an injection outer pipe 2 provided with a plurality of injection ports 3 at a prescribed interval is inserted into a drilled hole, a porous wall collapse prevention structure 16 composed of a porous wall collapse prevention material 15 with better water permeability than the object ground is provided around the injection ports 3 of the injection outer pipe 2, an injection material runaway prevention structure 13 formed by injecting a sealant 12 to an injection material runaway prevention material 11 with better water permeability than the porous wall collapse prevention material 15 is provided on the porous wall collapse prevention structure 16, and an infiltration cross section of the injection material 18 is increased by injecting the injection material 18 to the ground through the porous wall collapse prevention structure 16. <P>COPYRIGHT: (C)2012,JPO&INPIT |
