| 摘要 |
<p>PURPOSE: To reduce whole weight and to improve resisting pressure in pressure a resisting synthetic resin pipe for being buried under the ground with spiral wavy pipe walls by providing wide metal thin plates on internal walls along generally entire peripheral walls except one section of the spiral wavy walls. CONSTITUTION: A pressure resisting synthetic resin pipe for being buried under the ground has a pipe wall 1 formed to be spiral wavy shapes. A range of reinforcement belt plates 6, which are made of metal thin plates, is disposed trimming in synthetic resin material walls forming the pipe wall 1. The pipe wall 1 is formed at least three adjoining sections in a spiral-wavy-shaped summit section 2 forming the pipe wall 1, both side wall sections 3, 4 ranging to the spiral-wavy-shaped summit section 2, and a valley section 5 continuing to the both side wall sections 3, 4. Belt areas 51, which are formed from only synthetic resin materials and do not trim the belt plates 6, are formed at one section of the pipe wall 1.</p> |
