Punched of the branch arm piping canal orifice blockade film in the internal hard tubular inning main pipe and seal construction method

摘要

PURPOSE:To stably and certainly prevent a water or gas leak by drilling the closure film applied to the opening of the branch pipe of a main pipe having hard tube lining applied to the inner surface thereof by a pipe drilling machine and engaging a cap with the drilled hole from the interior of the main pipe to fix the same to said hole. CONSTITUTION:A pipe drilling machine 1 to be used has a heat-melting type drilling head 2, and the heated drilling head 2 and a cap 3 are allowed to advance in the radius direction of the main pipe (a) and invades in the opening b1 of a branch pipe (b) while melting and drilling a closure film (c). A melt c1 is formed by the melting and drilling of the closure film (c) to fill the peripheral gap 4 between the cap 3 and the pipe opening b1 generated by the difference between the inner and outer diameters of both of them and functions as the adhesive for adhering the cap 3 to the part of the pipe opening b1. When the heating of the drilling head 2 is stopped, the melt c1 is solidified by natural cooling and the cap 3 is engaged with and fixed to the part of the pipe opening b1. After the cap 3 is engaged and fixed, the drilling head 2 is allowed to recede in the pipe radius direction to be pulled off from the cap 3.