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1 Clean the notch to the design width and depth, and remove the interference with the displacement box. The opening of the reserved pit must be larger than the installation width of the expansion joint.
2 Check whether the gap between the beams of the telescopic device meets the installation temperature requirements. Otherwise, apply the horizontal jack and fixture to adjust until the design requirements are met. After adjustment, immediately install the special fixture. 3 Set the lifting device according to the center position of the expansion joint, and insert the expansion device into the slot, and make the top surface of the expansion device the same as the bridge surface. At the same time, pay attention to the vertical and horizontal slopes should also be consistent with the bridge deck.
4 After the telescopic device is hoisted into the reserved slot, its center line should be aligned with the center line of the gap at the beam end, and its length is aligned with the width of the bridge.
5 Adjust the straight section of the telescopic device and make the gap of each longitudinal beam uniform.
6 At the telescopic device box or anchor plate, the steel bars above the vertical welding borings are highly positioned, and the horizontal reinforced concrete bars are positioned for width. 13785855258 pay 
After the 7 telescopic device is properly anchored, the anchored steel bar on the side of the telescopic device and the reserved groove reserved steel can be welded to ensure that the telescopic device is fixed and leveled. When welding, only one or three anchoring bars are welded. Just, then follow the above steps to weld the anchoring rib on the other side. After the two sides are fixed, the remaining welded anchors can be welded again to ensure reliable anchoring. When welding anchoring ribs, care should be taken not to weld any welding on the side beam and the middle beam to prevent the steel beam from being distorted.
8 If the telescopic device is installed in sections, the joints must be welded. The welding should be carried out by professionals. After each beam is welded, 7 steps are used for anchoring.
9 According to the outer dimensions of the seam and the reserved slot, the template should be made to be tight after the template is placed. The waterproof slurry flows into the displacement box, and the flat surface of the expansion joint is covered with a cover plate to prevent the mortar from falling into the rubber sealing band. The correct flatness and midline position, as well as whether the gap meets the requirements, can only be poured into the concrete, and the concrete is fully vibrated and compacted. In particular, it should be noted that the displacement box and the reserved pit base cannot leave a void. Remove the fixing card from the template and expansion joint after the concrete has cured.
10 The expansion joint cannot withstand external loads until the concrete reaches 80% strength at the expansion joint. Maintenance of telescopic device
Normal maintenance and maintenance is an indispensable part of ensuring the normal operation and longevity of the telescopic device. Therefore, the maintenance work should be as follows:
(1) In combination with the daily maintenance work of highway bridges, frequently clean the debris, stone chips and other debris accumulated in the rubber band to prevent the free expansion and contraction of the telescopic device, and the smashing of the sealing rubber band. , causing water leakage and sand leakage, etc., if it is found to be damaged, the tape should be replaced in time. (2) Regularly check whether there are any damage, cracks or leakage at the joint between the side beam and the bridge deck. Once found, it should be repaired in time to avoid affecting the anchoring strength between the telescopic device and the beam and plate.
(3) Always check whether the top surface of the telescopic device is flat. If abnormal unevenness occurs, check whether the sliding bearing seat or the sliding pressing bearing is damaged. If it is damaged, it should be replaced in time. For the MZL type telescopic device, the convenience of component replacement has been fully considered in the design, and it has been proved to be completely feasible through experiments.
(4) In the daily maintenance, if there is excessive uneven displacement between the joints of the telescopic device, the components of the displacement control system can be inspected in time for damage. If any parts are found to be damaged, they should be replaced in time. The device uses standard components for easy replacement.
(5) Modular telescopic device, belonging to the steel structure, although it has been well protected before leaving the factory, due to the harsh environment used, after a certain period of use, the general corrosion is normal, then the maintenance department should Regularly re-rust treatment to ensure quality
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