CONSTRUCTION METHOD FOR REPLACING BURIED PIPE WITHOUT OPEN-CUT AND RELAYING AND NEW PIPE LEADING DEVICE USED THEREFOR

摘要

PURPOSE: To replace a buried pipe such as an underground buried water pipe with a new pipe to lay without open-cut by breaking the buried pipe by a new pipe leading device by way of pushing the new pipe leading device into the buried tube by a specified stroke, thereafter, burying the new tube by way of propelling it by a specified stroke and repeating this action. ;CONSTITUTION: A propulsion device 5 is constituted of a jack 20 and a presser plate 21. A main body 10 is inserted into a previously buried tube 4 by way of arranging a new tube leading device 6 in a starting pit 2, a cover 14 is made contact with the presser plate 21 and simultaneously, an intermediate presser plate 22 is made contact with the presser plate 21. In this state, by propelling the new pipe leading device 6 by way of pushing it through the presser plate 21 and the intermediate presser plate 22 by the jack 20 while breaking the buried pipe 4 and expanding its diameter, a new tube inserting space 23 is constituted underground by the cover 14 and the presser plate 21 is returned to its original position. Thereafter, in the starting pit 2, a new pipe 7 is put, and by pushing the new tube 7 by the presser plate 21, the new tube 7 is propelled into the cover 14. By repeating such an action, the new tube 7 is gradually propelled and buried.;COPYRIGHT: (C)1995,JPO