| 摘要 |
A watertight synthetic resin invert manhole is provided to secure firm joining force and to completely prevent occurrence of a water leakage, by melting and combining the surface of a manhole pipe, a bottom plate, and branch pipes and joining the outside of the combined area by polyethylene. In a watertight synthetic resin invert manhole, branch pipes(30) are combined with both sides of a synthetic resin manhole pipe(10) and the manhole closes up the lower part of the manhole pipe. A synthetic resin bottom plate(20) is joined to the lower part of the manhole pipe and a combining groove(21) where the manhole pipe is fitted is formed to the bottom plate. The manhole pipe and the bottom plate are melted and combined by frictional heat by fitting the manhole pipe to the combining groove and rotating the manhole pipe. Fitting holes(11) are formed in the sides of the manhole pipe and the branch pipes are fitted into the fitting holes. The manhole pipe and the branch pipes are melted and combined by frictional heat by rotating the branch pipes. The combining groove of the bottom plate has a diameter smaller than a diameter of the manhole pipe and the fitting hole has a diameter smaller than a diameter of the branch pipe. |
