DITCH COVER SUBSTRATE, DITCH STRUCTURE WITH COVER, AND FORMATION OF DITCH COVER

摘要

PURPOSE: To easily construct a ditch cover and sufficiently secure the mechanical characteristics of a ditch and the ditch cover. CONSTITUTION: A ditch cover substrate 11 is provided with a cover plate 12, a peripheral wall, and both hook pieces 14a, 14b. The ditch cover substrate 11 and a ditch type block 24 satisfy the relation: W11 W21 W12 = W22 where W21 is the size between the tips of both hook pieces 14a, 14b of the ditch cover substrate 11, W.22 is the size between the outer faces of both side sections l3c, 13d of the peripheral wall, W11 is the size between the outer faces of both side walls 24a, 24b of the ditch type block 24, and W12 is the size between the inner faces of both side walls 24a, 24b. The upper opening face of the ditch type block 24 is covered with the ditch cover substrate 11 to form a ditch structure with a cover. The upper opening face of the ditch type block 24 is covered with the ditch cover substrate 11 for the formation of the ditch cover.