| 摘要 |
PURPOSE:To greatly reduce the resistance of pipe by uniformly injecting a lubricant, e.g., water, etc., into between the excavation muck moving the inside a pipe and the wall of the pipe. CONSTITUTION:A flexible inner pie 2 formed by providing large numbers of slits to a thin-thick cylinder is provided to a body 1. When a lubricant, e.g., wter, etc., is supplied to a charging port 3 at a higher pressure than the pressure of sludge, the sludge is sent toward the direction of arrow by pump, but an apertue is formed between the body 1 and the inner cylinder 2 due to the flexion of the inner cylinder 2, the lubricant is uniformly injected from the aperture to the inner wall of the pipe, and a thin mud water layer mixed sludge is formed. On the other hand, the sludge occupying the central part of the pipe becomes smaller in even water permeation coefficient as the feed distance and consolidation increases, so that the mud water layer of great water content near the wall of the pipe is maintained as such. |
