| 摘要 |
PROBLEM TO BE SOLVED: To provide a chemical injection pipe by which a chemical injection process at a plurality of positions can be performed for a short time so that the ground improvement work can be completed efficiently.SOLUTION: A chemical injection pipe 100 comprises an injection pipe body 10, two packers P1 and P2 which block the inner wall of an injection outer pipe by air injection, an air passage 13 which injects air L3 into two of the packers P1 and P2 and which is extended to the downstream side of the second packer P2, a first injection port 1 which is disposed between two of the packers P1 and P2 so as to inject a first chemical liquid L1 into the foundation, a first chemical flow path 11 for guiding the first chemical liquid L1 to the first injection port 1, a second chemical flow path 12 extended to the downstream side of the second packer P2 so as to guide a second chemical liquid L2 to a second injection port 2, and a connection part 3 which is disposed on the downstream side of the second packer P2 so as to connect an extended injection pipe 200 having the second injection port 2. |
