| 摘要 |
A free movement, arris protection, construction joint (1) has a pair of arris protection members (2,3) formed complementarily from strips of sheet with a continuous trapezium wave form. A divider one (2) of the members is typically 100mm deep for a nominal 0.1m deep slab. The other one (3) is typically 50mm deep. The members are of steel plate. The wave form is comprised of flanges (4,5) extending in the length of the joint and of webs (6) angled to the flanges and the length of the joint. The flanges (4,5) are spaced on opposite sides of a mid-plane (7) of the joint. The members (2,3) are bolted together with flangible nylon bolts (8), with their top (in use) edges flush. Welded to the outer ones of the flanges are L strips (9) having apertures (10) in their flats (11) extending from the flanges for anchoring the joint to its slabs. Beneath the anchor members, extending out from every other flat (5) of the deep divider one (2) of the protection members are load transfer dowels (14), with sleeves (15) on their extent across the mid-plane and beyond. In use, concrete is cast with a horizontally castellated edge, castellations at positions (16) being bounded by the divider member (2). Complementary castellations on the other side of the joint at the positions (17) interdigitate with the first castellations (16). The castellations extend to the full depth of the slabs and can be expected to have a long life. |
