Being abolition construction method and the abolition construction method which abolishes

摘要

PPROBLEM TO BE SOLVED: To provide methods for facilitating abolishment work for an iron-made disused conduit and new pipe laying work. PSOLUTION: An abolishment method for a disused conduit 1a consists of the process for opening both ends of the disused conduit 1a, determining a filling amount and mix of fluidization treated soil 30 containing a microbe rusting the disused conduit 1a in response to a diameter and extension of the disused conduit 1a, manufacturing at site the fluidization treated soil 30 containing a microbe on the basis of the determined filling amount and mix and carrying to the site the fluidization treated soil 30 manufactured in advance on the basis of the determined filling amount and mix, of the process for removing treated soil exceeding a prescribed particle diameter of the fluidization treated soil 30 to adjust the particle size thereof, and of the process for filling the fluidization treated soil 30 subjected to the particle size adjustment through one end in the disused conduit 1a. The new pipe laying method includes the abolishment method, and after the abolishment method, performs a process for bring a conduit 1a into a communication in which a new pipe 40 is shallowly buried in the upper position of the disused conduit 1a and connected thereto. PCOPYRIGHT: (C)2008,JPO&INPIT