| 摘要 |
PURPOSE: A method for manufacturing a multi-wall plastic pipe with enhanced rigidity is provided to rapidly form the multi-wall plastic pipe from square pipes connected to each other by joining portions. CONSTITUTION: A method for manufacturing a multi-wall plastic pipe with enhanced rigidity is as follows: Square pipes having hollow portions are installed in inner and outer profiles(51,51'). The square pipes are connected to each other by joining portions. Connecting grooves are formed in upper and lower parts of the joining portions. A projected reinforcement portion(60) is formed in the profile in one direction. The projected reinforcement portion comprises a reinforcement space in order to be continuously connected to a lower left corner of the square pipe when the profiles are connected to joining members. The connecting grooves are filled with filler members. The profiles are formed into spiral shapes, and connected by the joining members.
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