| 摘要 |
<p>PROBLEM TO BE SOLVED: To make this device lighter than that made of concrete and facilitate the handling by possessing a pressure-resistant plate which covers the sections to be in vertical direction when a cable pipe supporting member made of synthetic resin foamer is installed underground. SOLUTION: Three cable pipe supporting plates 11, 21, and 31 are polyethylene foaming molded items, and cable pipes 1a-1d are corrugated cylindrical pipes made of polyvinylchloride. A lower cable pipe supporting plate 11 has three crosspieces 12, 13, and 14, extending in parallel and a plurality of ribs 15, 15b, and 15c molded integrally in the direction orthogonal to the crosspieces 12, 13, and 14. Then, a worker fills up an excavated groove to roughly the topside position of an upper cable pipe supporting plate 31. At the time when the filling up to the level of the top end face of the upper supporting plate 31 has been finished, a pressure-resistant plate 32 is placed on the topside of the upper supporting plate 31 in such a way so as to pass bolts 40a-40d through the through-holes 43a-43d, and the pressure-resistant plate 32 with fastening nuts is fixed.</p> |
