Highway bridge expansion joints bridge expansion joints role: that of the upper structure by adjusting the vehicle load and bridge materials arising between the displacement and bonding. Skew Bridge telescopic device is damaged, it will seriously affect traffic speed, comfort and safety, and even cause traffic accidents. Highway bridge expansion joints bridge expansion joints set in the weak parts of the beam end structure, the role of direct withstand repeated loads, while affected by various natural factors, so the telescopic device in the form of selection, control the construction process is particularly important. After a large number of comparative tests of the bridge, the present situation of the construction to develop this construction program. Highway bridge expansion joints material selection arrangements, construction time can only choose a relatively small amount of traffic at night according to this task and bridge expansion joint replacement project; the choice of materials on concrete should meet rapid setting time is short, high early strength construction convenient quick concrete. Highway bridge deck expansion joints reserve tank cleaning paving asphalt surface closed to traffic after the completion of the excavation slots reserved. Firstly, thin with a basic accuracy of eye-catching colors marked reserve position, and then the crusher location of the expansion joints at the east and west sides of 50cm were broken, and then cutting the size of geometric nation treatment. Cutting should ensure that the entire edge of the deck Qi Pingshun asphalt surface, no defects. After completion of the slit to clean up all kinds of debris inside the slot filled, steel and other clean. Excavation should prevent contamination asphalt surface, and re-exposed parts of the notch concrete cutting hair treatment. Highway bridge expansion joints cutting old joints after notching the original old joints were cut out, cut out when taking into account the special nature of the expansion joint material, the application of oxygen-acetylene welding gas cut from the roots, to be completely cut is completed, you can remove the old joints. Using grinding machine for grinding roots protruding parts processing, reserve after cutting steel keep consistent line on the site also has a deformed application to be processed hammer; the situation is still the site of the old joints debris should use fine steel to tick. Backfilling asphalt concrete highway bridge expansion joints due to construction time limit, after making slotted finish and joints should be cut immediately to reserve slots filling cold mix asphalt live, RCC, to ensure an open traffic within the stipulated time, and shall not affect the normal passage of vehicles. Former highway bridge expansion joints installed during the installation of expansion joints, should first be cleaned cold mix asphalt and residual debris removed. The same model will be ready to install slot joints caused by lifting, lifting process should prevent the collision, oblique hanging, or improper lifting, and make the joints bending deformation. To prevent deformation of the hanger spacing can be adjusted according to the situation or increase the auxiliary bracket, after the basic joints in place, adjust the center line and the center line of the reserved slot is consistent with the standards approved by two feet on both sides of the road outside of the elevation of its elevation and ends with a 3m straight foot flatness testing, adjustment. Highway bridge expansion joints first spot-welded joints on both sides of the positioning Anchorage, take sides repeatedly interval welding, staggered joints, alternately. At the same time we should always retest linear joints and elevation to flatness, straight degrees to meet the design requirements. Then, with a symmetrical method of welding joints firmly anchor ring with embedded steel welding, weld length can not be less than 10d. If special circumstances were not long enough to increase steel welding connection. After all the welding, expansion joints can be removed and the ends of the locking plate fixation tendons. To increase driving comfort, on-site during construction, expansion joints of the top surface of the longitudinal elevation of each point can be slightly lower than the elevation of the surface layer of asphalt on both sides, should be controlled within 1mm. When pouring concrete highway bridge expansion joints in the concrete factory technician during preparation guidance, and in strict accordance with instructions formulated concrete elasticity. In the preparation process, the construction workers must wear rubber gloves, and to prevent accidental elasticity of concrete spilled on the skin. Highway bridge expansion joints ① clean up a notch construction methods, so as to achieve the design width and depth, clear and displacement have reinforced box buried interference reserved pit openings must be greater than the width of the expansion joints installed. ② Check whether the beam between the gap in line with telescopic device installation temperature requirements, otherwise, the application level jacks, adjust the clamp until it meets the design requirements, adjusted immediately after the placement of special fixtures. ③ joints central location settings lifting device, the telescopic device security within the notch and retractable top and deck elevation of the same device. Also note that slope aspect should also be consistent with the deck. ④ After hanging into the reserve tank telescopic device, which should be the end of the beam centerline centerline space reserved on the positive, the length and width of the bridge being. ⑤ on the telescopic device to adjust the line segment, and each stringer gap uniform. ⑥ telescopic device again in the box or anchor plate at vertical welding Ф16 more highly locate rebar, steel bar width horizontal welding Ф16 positioning. After anchoring ⑦ telescopic device is properly seated, would be able to anchor bars and reserved slots reserved telescopic device side welded steel telescopic device to ensure that the fixed line and leveling, as long as every two to three anchoring tendons welding a welding you can, and then press the steps above welding anchor tendons on the other side. After the two sides reached a fixed, you can rest welded anchor tendons then welded to ensure reliable anchor. When welding anchor tendons do not pay attention to the side beams and the beam welding any construction to prevent deformation of twisted steel beams. ⑧ telescopic device if the sub is installed, the seams must be welded, soldered by professionals, each beam welding is completed, then the anchor ⑦ steps. ⑨ According to sew reserved slot dimensions and production templates, the template should be put away after blocking tight to prevent water flowing into the displacement slurry tank, expansion joints stamped on board the plane, to prevent falling into the rubber seal with mortar, in the inspection apparatus After flatness is correct and neutral position, and are in line with the requirements of the gap before poured concrete, and concrete vibrators fully compacted, with particular attention to the displacement of the pit box and set aside the base surface can not leave empty. Concrete curing retreat to be fixed card templates and expansion joints on the go. ⑩ before concrete expansion joints does not reach 80% of the strength, expansion joints can withstand external loads. www.grgcxj.cn www.grxjgs.com www.hsgrgc.com www.grxjgc.com www.grgcxj.com 

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