| 摘要 |
PROBLEM TO BE SOLVED: To construct a proper bottom surface shape and a drain gradient side ditch only by precast concrete. SOLUTION: After arranging an invert 1 for forming the proper bottom surface shape or a lower part reduced water feeding cross section in a drain gradient on a foundation 13, footings 2 and 2 are attached to both sides of the invert after adjusting an upper surface of invert both side foundations 13 and 13 to the required height, a gantry type side ditch body 3 is placed on small steps 5 and 5 by being substantially circumscribed on stoppers 14 and 14 of the footings. COPYRIGHT: (C)2006,JPO&NCIPI
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