Expansion joint preparation before installation:
should check the docking bridge joint seam is certificate of steel bearing bridge expansion, specifications, and invite relevant personnel supervision, design and appearance of the telescopic joint, check and acceptance of geometric precision, qualified rear can use. The line on the bridge, cutting: according to the design position of expansion joint line release and, according to the size of design from the centerline position measurement of expansion joint of concrete protective line, with concrete cutting machine by drawing a line cutting deck asphalt concrete. In order to ensure the cutting edge is not damaged, can be divided into two. The first cutting slit distance protection line to be reserved for the 5cm, before pouring the concrete, and then along the accurateSecond. Cutting edge cutting requirements straight, accurate cutting, careful not to damage the waterproofing layer, the waterproof layer up to be protected.
The bridge must be timely cleaning, filling gap: with artificial air compressor to clear cutting asphalt concrete range, and chiseling concrete loose, while the joint internal debris to clean up. The slit width must meet the design requirements after cleaning with width, the benzene board expansion joint block strict recovery. The embedded anchor bar. The number of reserved rebar should be consistent with the design drawings, if it does not correspond to timely repair welding. Using air compressor to clean up again. In order to prevent the expansion joint installation process of weld burn in foam board, foam board on both sides of steel or iron cover.