CONDUIT TUBE FOR AIR-JET CONSTRUCTION METHOD

摘要

PROBLEM TO BE SOLVED: To provide a conduit tube which is fit for an air-jet construction method, having pressure resistance and flexibility and being hard to buckle. SOLUTION: This straight tube of a two-layer structure has an inner layer 1 and an outer layer 2 and is a conduit tube, where the inner layer 1 is made of high-density polyethylene and the outer layer 2 is made of low-density polyethylene and the inner layer 1 and the outer layer 2 are stuck closely to each other. Pressure resistance is secured by the inner layer 2 of high-density polyethylene, also the buckling and flat transformation are prevented, and flexibility is imparted by the outer layer 2 of low-density polyethylene.