METHOD FOR SEALING AND CORROSION-PREVENTING INSIDE SURFACE IN BROKEN PART OF BURIED CONDUIT OR THE LIKE

摘要

PURPOSE:To repair and maintain a buried pipe to be maintained by digging said pipe at a suitable interval, feeding forcibly and successively a foamable and curable material as well as a lining material into the pipe and forming sealing and corrosion-preventive layers. CONSTITUTION:An underground buried pipe is dug at two points at about 100m interval and a foamable material A is forcibly fed into said pipe by a pig from one port thereof and is discharged from the other part. A material B such as aminals and water is forcibly fed therein by the pig to foam and cure the material A. Then the material A foams quickly in contact with the material B and cures with increase of its volume thereby sealing holes. After corroded holes 3, etc. are sealed in such a way, a lining material E is forcibly fed into the pipe by the pig to form the corrosion preventive lining integrally with sealing of holes.