| 摘要 |
<p>PROBLEM TO BE SOLVED: To assure a simplified process for a common wire duct, by making the lower half of the cross-sectional area of an insertion hole semi-circular, and the upper half thereof different in shape which may be coupled with a play in combination with a part of the groove of the lower half of the wire protection conduit. SOLUTION: Each single surface of a rectangular shape block 1 consisting of a precast concrete forming a groove 2 having a semi-circular cross-section to a single surface, a rectangular shape block consisting of a precast concrete forming a groove 3 having arc-wise cross-section to a lower surface and a rectangular block 5 consisting of precast concrete forming a groove 3 having arcuate cross-section to a single surface are stacked in the multiple stage in the vertical direction and in the required number of parallel lines in the horizontal direction to form common a wire duct 12. The grooves 2, 3 coupled in the upper and lower sections form in its cross-sectional shape for inserting the wire protection conduit 8 in the longitudinal direction a tunnel type inserting hole 9 for wire insertion into the wire protection conduit 8. As a result, only wire protection conduit insertion to the inserting hole is required to improve efficiency and shorten the work period.</p> |
