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- GQF：
- c40
- GQF：
- c80
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Special-shaped steel expansion joints
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Special-shaped steel expansion joints
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Special-shaped steel expansion joints
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Introduction to special-shaped steel expansion joints
Bridge expansion joint devices are divided into single-group bridge expansion joints and modular type ( Multi-group) bridge expansion joints gravel elastic expansion joints plate type rubber expansion joints combined rubber expansion joints. Single-group bridge expansion joints are also called expansion joints. The product series is divided into five types of special-shaped steel materials. Multi-group modular expansion joints are suitable for large highway bridges. The expansion joints have smooth driving, low cost, good waterproof performance and no tripping.
Type expansion joint is a new type of highway bridge expansion device with Chinese characteristics. It is a bridge telescopic device composed of side beams, middle beams, cross beam displacement control system, sealing rubber belts and other components.
The bird-shaped rubber sealing strip of the bridge expansion joint is made of chloroprene or EPDM rubber according to the width of the bridge, and has good aging resistance and flexural resistance. It adapts to the horizontal, transverse and vertical deformation of the bridge and has minimal resistance to expansion and contraction.
The anchor plates and anchor bars made of precision-rolled steel edge beams in the bridge expansion joints have good mechanical properties. The vehicle impact force acting on the side beams is evenly transmitted to the beam body through the anchoring components and has a long service life.
Expansion joints are a general term for single-group module expansion joints. Bridge expansion joint products, all designed using hot-rolled integrally formed special-shaped steel materials, are suitable for bridge joints with less than the expansion amount.
The bridge expansion joint code representation method is consistent with the transportation industry standard representation method of the People's Republic of China. Take the type of bridge expansion joint as an example. Among them, the bridge expansion joint device code type code specified by the transportation industry standard is represented by straight beam connecting rod chain type (). The shape number of the special-shaped steel indicates the displacement of the telescopic device.
and means rubber type means natural rubber means chloroprene
Applicable range of rubber materials used in bridge expansion joints
The expansion joint device using chloroprene rubber is suitable for areas with a temperature of The rubber expansion joint device is suitable for the installation of special-shaped steel expansion joints in areas where the temperature is lower than the normal temperature. Draw the line and cut the groove according to the size of the construction drawing. Draw the reserved groove position line and cut the asphalt along the drawn line. The pavement is approx.
Cut out and clean the asphalt in the reserved groove to reach the appropriate width and depth for placing the telescopic device. If the original bridge does not have pre-embedded reinforcement, the reinforcement will need to be planted on site.
After adjusting the positioning value of the telescopic device's seam width according to the installation temperature on site, hoist the telescopic device into the reserved slot so that its center line is aligned with the center line of the reserved gap at the beam end, and its length is aligned with the width of the bridge. Make the top surface of the telescopic device consistent with the highest elevation of the bridge deck, and spot-weld the anchoring bars at the highest point with the embedded bars. Use the paved road surface on both sides of the bridge as a standard. Use a jack to adjust the telescopic device so that the top surface of the telescopic device is at the same elevation as the road surface. Then, spot weld the anchoring bars here with the pre-embedded steel bars. This method is used to adjust the telescopic device in turn to reach the bridge deck slope. . After the telescopic device is fixed, the above steel bars are welded vertically at the anchor bar for height positioning, and the horizontal welding steel bars are positioned for straightness to ensure reliable anchoring. Weld all the spot welds between the entire telescopic device and the embedded steel bars. When welding the anchor bars, be careful not to weld arbitrarily on the section steel to prevent the steel beam from twisting and deforming.
After all welding is completed, cut off the positioning steel plate and set up the beam end formwork and expansion joint formwork (steel plate or polystyrene foam board or wooden board formwork with appropriate thickness can be used to make the formwork according to the outer dimensions of the expansion device and the reserved gap. The template should be made It must be quite tight to prevent mortar from flowing into the gap at the end of the beam.
Use steel fiber concrete for pouring. Before pouring concrete, check whether the tank is flushed and there is no possibility of slurry leakage. Vibration stirring is required during pouring to ensure that the bottom of the special-shaped steel The concrete should be full and dense without cavities. To ensure the flatness, use a ruler pole to level it at least twice before the concrete is collected. Note that the height of the concrete surface and the top surface of the telescopic device should be flush with the paved road surface, and there should be no difference in height. If it is too high or too low, it will have adverse effects on the use of the expansion joint.
After the concrete is initially set, remove all the formwork and install the sealing rubber strip. Remove the debris in the steel joint and insert one side of the rubber strip into the groove first. Then embed the other end inside. When installing the rubber strip, you need to make three or four tools in advance (the tools are the same. The specific production method is to cut rebar with a diameter and length of about 100m, burn one end of the rebar red, flatten it, bend it to a length of about 10m, and polish it. The bent part makes its surface smooth. The end is polished so that it is round and will not puncture the rubber belt. The bending part is polished and smoothed so that the tape can slide easily on the steel in contact with it when the installation tape is installed.
Concrete curing at normal temperature Use natural curing and cover after pouring hours. Film, sawdust, sacks, geotextile and other materials can be used as covering materials to keep the concrete moist to facilitate the hydration reaction of the concrete.
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