| 摘要 |
PROBLEM TO BE SOLVED: To provide a concrete drop lid attached side ditch capable of preventing the occurrence of a sound and jumping in the case of trampling by forming a contact section of an upper surface cave-in step section of a side ditch body with a drop lid in a smart and simple shape. SOLUTION: In the concrete-made drop lid side ditch formed by mounting the drop lid on the upper surface cave-in step section, the contact section of the upper surface cave-in step section of both right and left sides of a side ditch body 1 and the drop lid 2 are respectively formed in approximately S-shaped curved surfaces 3, 3, and 4, 4 linking arc-shaped projection curved surface and recess curved surface, the approximately S-shaped curved surfaces 4 and 4 are made to come into contact with the approximately S-shaped curved surfaces 3 and 3 formed in the upper surface cave-in step section of the side ditch body 1 in a boundary section between the projection curved surface and the recess curved surface of the approximately S-shaped curved surfaces, and the concrete drop lid 2 attached side ditch is constituted by engaging the projection curved surface with the recess curved surface other than the boundary section with a slight clearance. COPYRIGHT: (C)2005,JPO&NCIPI
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