1. purchase and storage of bridge expansion joints
The equipment shall be purchased and assembled according to the different types, length, type of sealing rubber parts and the width at installation time as per the different types and widths of the design drawings, and the telescopic devices of different brands and models shall be supplied by the special manufacturer. The expansion device was assembled in Hengshui Pentium rubber co., ltd., and transported to the site by special equipment. The assembling and expansion device shall be installed before the factory and the manufacturer according to the installation dimensions as required by the drawing, and fixture shall be fixed so as to keep the width required of the drawing and mark the weight and position of the crane. If the combined expansion device is subjected to the transportation length limit or other reasons, after the approval of the supervision engineer, after the assembly of the assembly, the assembly can be assembled and transported, but modular telescopic devices must be assembled in the factory. The expansion joint materials used for the sub-project shall be entered into the site as planned, and the telescopic devices shall be transported to the site for storage at least 30cm from the ground and covered with color strips to ensure that they are not damaged and meet the requirements for commencement.
2. installation of expansion joint
A. when installation, determine the installation width value according to the actual temperature.
B. expansion joint installation process must be arranged orderly with the expansion joints, and maintain a certain slope. Ensure that the maximum plane of the telescopic device is flat with the completed deck.
C. construction method
① clear the slots to reach the design width and depth, and remove the reinforcement with interference with the displacement box, and the opening of the reserved hole must be greater than the installation width of the expansion joint.
② check whether the gap between each beam of the expansion device meets the installation temperature requirements, otherwise, apply the horizontal jack and fixture to adjust until the design requirements are met, and then install the special fixture immediately after adjustment.
③ set up the lifting device according to the center of the expansion joint, install the expansion device into the slot, and make the top surface of the expansion device is the same as the deck elevation. Also pay attention to the vertical and horizontal slope should be consistent with the bridge deck.
④ after the expansion device is hoisted into the reserved slot, the center line shall be aligned with the center line of the end of the beam end, and its length is aligned with the bridge Liang Kuan.
⑤ adjust the line segment of the telescopic device and make the gap of each longitudinal beam uniformly.
⑥ again in the expansion device body or anchor plate, the rebar above the welding Ф 16 shall be highly positioned, and Ф 16 steel bars shall be welded in width to position.
⑦ after the expansion device is properly installed, the anchoring reinforcement and reserved groove of the side of the expansion device can be welded to ensure that the expansion device line is fixed and leveled, and as long as every 2 ~ 3 anchoring bars are welded at every 2 ~ 3 anchorage bars, then the anchorage bars on the other side are welded according to the above steps. After both sides are fixed, the anchorage bars of the remaining welded joints can be welded to ensure reliable anchorage. When welding the anchorage bars, pay attention not to any construction welding on the edge beam and beam in order to prevent distortion of the steel beam.
⑧ if the expansion device is segmented, the joint shall be welded, and welding shall be carried out by professionals. after each beam is welded, then press ⑦ to install it.
⑨ according to the contour dimension of the seam and the reserved notch, the formwork shall be covered and covered with waterproof mortar into the displacement box, and the flat panel shall be covered on the expansion joint to prevent mortar falling into the rubber sealing belt, and the concrete shall be grouted only after the correct flatness and midline position of the device, and whether the cracks are all in conformity with the requirements, and shall be fully vibrated and compacted to the concrete, especially attention should be paid to the displacement box and the reserved pit foundation surface. The concrete is solidified to pull back to the template and the fixed card on the expansion joint.
⑩ before the concrete at expansion joint reaches 80 % strength, the expansion joint cannot bear the external load.
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