FEEDING INNER PIPE FOR SOIL IMPROVING METHOD, FEEDING PIPE FOR SOIL IMPROVING METHOD, HAVING THE FEEDING INNER PIPE FOR SOIL IMPROVING METHOD, AND SOIL IMPROVING METHOD IMPLEMENTED BY USING THE FEEDING INNER PIPE FOR SOIL IMPROVING METHOD

摘要

PROBLEM TO BE SOLVED: To provide an inner pipe which can simultaneously feed a chemical in multiple stages, and is easily insertable into a curved outer pipe by following the outer pipe as a whole. SOLUTION: The inner feeding pipe is formed of narrow tubes 2 and a plurality of joint members 3 connecting between the narrow tubes 2, which joint members 3 are each formed with insertion portions 8 into which the narrow tubes 2 are inserted. While both ends of each narrow tube 2 are inserted into the insertion portions 8 of the joint members 3 on respective sides, and at the same time they are inhibited from slipping out of the insertion portions 8 of the narrow tubes 2, at least one end of the narrow tube 2 is made slidable in an axial direction of the narrow tube 2, and the narrow tube 2 communicates with the other narrow tube 2 connected to the joint member 3 concerned in the axial direction of the narrow tube 2. Further at least one of the narrow tubes 2 communicates with a packer 10 mounted on the joint member 3 while being inserted into the insertion portion 8. COPYRIGHT: (C)2009,JPO&INPIT