Renewal (Renewal) method and its apparatus

摘要

An object of the present invention is to perform a work of renewing a cast iron pipe buried in the ground with a flexible pipe or a steel pipe without grasping the ground.;The pulling-in gang 2 and the inlet casting 3 are opened and the inlet port 4 is provided in the inlet port 3. The pull rod 5 is inserted into the existing pipe made of the cast iron pipe 1 from this apparatus, . And connects the update device A to which the PE tube 6 is connected to the pull rod 5. The updating device includes a cutting portion 11 having a cutter body 14 (shanks 14a to 14i) arranged in a plurality of circumferential directions at a predetermined angle and in the axial direction, a diameter enlarging portion 12 having diameter increasing rollers 18a to 18f, , And a connection portion (13). The inner circumferential surface is cut by the cutter body to form the cutting groove 1b and the cutting is performed with the cutting groove 1b as a starting point to form a plurality of arc pieces 1a The circular arc piece 1a is bent by elasticity in the elastic limit by the diameter roller so as to be pressed into the fractured surface and the PE tube 6 is pulled in while forming the tunnel 7 surrounded by the compacted portion with the piece 1a The periphery of the PE tube 6 is armored by a plurality of arc pieces 1a.