INSIDE DIAMETER, OUTER DIAMETER REINFORCEMENT DUPLEX WALL SEWER AND THE MANUFACTURING METHOD

摘要

PURPOSE: A double wall for internal and external diameter reinforcement is provided to effectively bear external pressure by preventing partition generated in a joint of a small pipe and improving strength. CONSTITUTION: A double wall for internal and external diameter reinforcement comprises a profile(10). An external diameter reinforcing support(12) and an internal diameter reinforcing support(13) are installed in the profile. The external diameter reinforcing support is positioned outside a small pipe(11). An external diameter projected blade(12a) is formed in the external diameter reinforcing support. The internal diameter reinforcing support is located inside a small pipe. An internal diameter projected blade(13a) is formed in the internal diameter reinforcing support in the opposite direction to the external diameter projected blade.