The technology allows using the trenchless method along an existing route to replace cast-iron, ceramic, asbestos-cement, concrete and reinforced concrete pipelines. Nine sizes of equipment to replace pipelines from 100 to 600 mm in diameter have been developed. This technology allows replacing faulty pipelines with polyethylene ones with a 1.5-2 times diameter increase.
Operational principle:
An enlarging head with ribs is mounted on the pneumohammer located in the work well, to the back of this head some sections of the new pipeline are connected. The hoisting cable passes through the replaceable section of the pipeline with the help of an anchor device located in the input well and joins the bow of the percussion mechanism. During pneumohammer operation, the stroke is transmitted to the enlarging head and through it to the old pipe. The old pipe is destroyed and the soil is moved to the outer diameter of the enlarging head. The new pipeline is dragged into the tunnel formed by pneumohammer movement. This pipeline advances section by section with the help of pipe tongs in the work well. Depending on the pipeline operation type, dragging method can be chosen. The technology allows laying polyethylene pipe of a smaller diameter into a pipeline without destroying it.
