| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a lightweight cable pipe excellent in workability for carriage and application, low in material cost, and enabling to shorten an application time and lower the application cost by vibration-compacting a hard kneaded concrete containing lightweight aggregates, immediately demolding and subsequently curing the molded concrete. SOLUTION: The figure is the squint one of a cable pipe 1 having four insertion holes. The large holes of the pipe are used as the insertion holes 2 for cables, and the small holes are also used as PC steel bar insertion holes 3 for the passage of PC steel bars for connecting the cable pipes. In the lightweight concrete, a lightweight aggregate such as foamed polystyrene, perlite or vermiculite is used as a part or all parts of the aggregate. The foamed polystyrene having a granule diameter of 0.1-10mm and a specific gravity of 0.01-0.08 is especially preferably used. The cement includes various kinds of Portland cements. In the production of the concrete, the components are compounded in a water/cement weight ratio of 10-40% in an aggregate/cement volume ratio of 1-5 and in a slump of 0-5cm. The lightweight concrete cable pipe obtained from the composition has a compression strength of 1-100kg/cm<2> and a flexural strength of 0.2-20kg/cm<2> .</p> |
