| 摘要 |
<p>PROBLEM TO BE SOLVED: To joint a polyethylene tube and a manhole made of concrete easily and solidly in particular, and to prevent the generation of removal of the tube after the processing, owing to a deflection and the like by a ground subsidence and the like, by covering sand particles of the outer peripheral surface of a thermoplastic resin tube by a fusing means so as to provide a sand particle layer. SOLUTION: Sand particles 12 are attached along a specific width near the tube end of a polyethylene tube 11 connected to a manhole made of concrete, so as to be made in the condition to cover the surface of the polyethylene tube 11. When the polyethylene resin on the surface of the sand particle layer 12 is heated and made in the fused condition, the sand particles are squeezed and sunk to the inside, and cooled and solidified to be attached solidly, and the sand particle layer 12 can be formed. Consequently, the end of the polyethylene tube 11 can be jointed directly to the concrete manhole solidly, at a low cost and without increasing the number of processings.</p> |
