Traditional round dowels for slabs on ground have been the most common method for providing load transfer across floor slab joints. Most engineers appreciate that using round dowels allows shrinkage contraction in only one direction. Round dowels do not allow any lateral movement of the slab, resulting in the slab “locking” and cracking across the corners.
round dowels
plate dowels DD6
Analyses demonstrates that the stress from the Diamond Dowel reduces significantly beyond the first 25mm of the dowel past the joint. It also can be seen in this diagram that only a small portion of the plate has the maximum stress.The diamond plate is the optimum shape for a dowel; it is wide where the bearing, shear and flexural stresses are highest and is narrow where the stresses are reduced. Importantly, the Diamond Dowel allows the slab to move in 2 directions on the horizontal plane without restraint, as the concrete shrinks and the joint opens.
"DIAMOND" DOWEL PLATE - DD6, thickness: 6mm:
Steel DD6 plate dowels are delivered with plastic Sleeves. Plastic Sleeves are delivered with nails alowing to fix them to the timber formwork and with tape which helps to find hole in Sleeves after removing timber formwork.
Plastic Diamond Dowel Sleeve has to be nail to the formwork at the desired centres. After casting the concrete, remove the timber formwork leaving the Diamond Dowel Sleeve embedded in the slab. Remove the palstic tape from plastic slave. Insert Diamond Dowels Plates in to the Diamond Dowel Sleeve ready for casting concrete on the second side of the pour.
Plastikowe osłony DD6 naleŜy przymocować do drewnianych szalunków przed betonowaniem za pomoca specjalnych śrub. Nie trzeba wykrawać Ŝadnych dziur czy otworów na dyble gdyŜ są one umieszczane dopiero po usunięciu drewnianego szalunku.
