| 摘要 |
PROBLEM TO BE SOLVED: To make the pipeline inside inspection by a worker safe and easy and reduce the execution cost by laying and fixing a minor diameter pipe closer to one lateral side of the inner bottom of a major diameter pipe. SOLUTION: A plurality of pipe sleepers 2 with a pipe placing recessed part provided closer to one end side is longitudinally fixed to the inner bottom of a major diameter pipe 12 constituting a tunnel 1 by bolts and nuts, and the pipe sleepers 2 are mutually longitudinally connected by a beam material. A scaffold plate 5 is longitudinally nailed to the upper surface of the pipe sleeper 2. The part where the scaffold plate 5 is laid is used as a working passage to carry a minor diameter pipe 3 into the major diameter pipe 12 by a truck, the minor diameter pipe 3 is laid with connection, and fastened and fixed by a fixing band 4. The circumference of the pipe 3 is enclosed by an invert member 7, and air mortar 8 is pressure-injected into the space S formed by the invert member 7, the outer surface of the pipe 3, and the lower half inner surface of the pipe 12, and solidified. According to this, a broad passage can be formed, and the internal inspection can be safely and easily performed by use of this passage.
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