| 摘要 |
PROBLEM TO BE SOLVED: To shorten a period of time required for continuous works from arranging steel pipes to injecting back-filling materials, and to facilitate additional injection of the same. SOLUTION: One of steel pipe joints 31, 41 is formed into a hollow joint which has filling holes formed therein at predetermined intervals, in order to inject back-filling materials. Then, a filling pipe having double packers 60 connected thereby like a chaplet is inserted into the hollow joint, and a pair of the double packers 60 form a closed space with the injection holes therebetween. Then, the back-filling material is injected from each closed space via each injection hole all at once.
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