| 摘要 |
<p>PURPOSE:To permit the economical pulling up of an embedded pipe and remove soil and sand by dredging the soil and sand on the periphery of a sea bottom embedded pipe and cut the embedded pipe and pulling up said pipe by a wire and softening the soil and sand in the upper part of the embedded pipe by the high pressure jet water. CONSTITUTION:The periphery of an embedded pipe 1 in each prescribed length D of the embedded pipe 1 buried into the foundation of a sea bottom B is dredged by the glove 3 of a glove dredging vessel, and soil and sand are removed, and the embedded pipe 1 after excavation is cut. The edge part of the cut embedded pipe 1 is caught by a wire 17, and pulled up by a turnable crane vessel 18, and the soil and sand in the upper part of the embedded pipe 1 is successively softened by the injection of the high pressure jet water J supplied from a jet nozzle 20 over the whole length of the embedded pipe 1 in a prescribed cut length D, and the embedded pipe 1 in each prescribed cut length D is pulled up. Therefore, the dredging work quantity is reduced, and the economical removing work is permitted.</p> |
