Construction technology of multi-directional displacement comb-tooth plate bridge expansion joint
1) Cutting notch: Determine the reasonable notch size according to the expansion and contraction of the bridge. In this project, the width of the notch is 20 cm, and the waterline is marked at the position of the saw, and then cut along the line with a toothless saw to maintain the notch line Parallel to ensure the beautiful appearance of the bridge head seam.
2) Slot cleaning and drying: rinse the cut slot with clean water; use a forest fire extinguisher to blow away the floating soil and loose particles in the slot; use a flamethrower to dry the moisture of the trench to fully dry it.
3) Apply adhesive: evenly apply TST special adhesive to the bottom and both sides of the notch, do not expose the two sides, to prevent the broken stone and the notch from being combined firmly and falling off, resulting in the joint of the bridge head damage.
4) Coat the base oil and place the sponge and steel plate: plug the seam with a foam sponge, place the lower lap steel plate with a thickness of 4 ^} 6 mm in the seam smoothly, the width is about 50 mm on both sides of the seam It is appropriate to apply a layer of asphalt binder to the bottom of the trench evenly and fully, preheat the beam end with a blowtorch, and apply a layer of adhesive sol to the beam end (on the trench side) after preheating. The gap between the (or board) and the back of the table is filled with sponge to prevent particles such as gravel from falling into the gap.