Year1
- 厂家：
- 衡水德祥
- 规格：
- C80
- 型号：
- GQF-C
Yixing highway bridge expansion joint device - high precision Yixing highway bridge expansion joint device - high precision type expansion joint sealing strip Yixing highway bridge expansion joint device - high precision Yixing expansion joint sealing strip Highway bridge expansion joint device - high-precision type with expansion joint sealing strips Yixing highway bridge expansion joint device - high-precision type with expansion joint sealing strips
Installation method of bridge expansion joints
1. Bridge deck cutting After the asphalt concrete pavement layer on the bridge deck is completed and accepted, we can determine the slot width according to the requirements of the expansion joint construction drawing, accurately stake out the lines, and then use a cutting machine to saw the seams and saw them straight. The asphalt concrete pavement other than the seam lines must be Carefully cover with plastic sheeting and seal with tape to prevent stone dust produced during sawing from contaminating the road surface.
2. Grooving of bridges: When the construction unit uses a pneumatic pick to groove, the depth of the groove shall not be less than 10%. The asphalt concrete and loose cement concrete in the groove shall be chiseled out cleanly and roughened to the hard layer and used with a powerful hair dryer or high pressure Water gun removes floating dust and debris.
3. Positioning of the steel bars on the bridge: Before we install the expansion joints, we must calculate the amount of expansion based on the on-site temperature = ** and implant the plate positioning steel bars below the top surface of the beam. For bolted connections, high-quality welding rods must be used to weld the positioning steel bars and expansion joint screws firmly.
4. About template installation. The fiberboard formwork used for bridge formwork should be strong and tight so that it does not move when the concrete is vibrated and prevents mortar from flowing into the expansion joints to avoid affecting expansion. Ribbed steel mesh should be set up on both sides. The top of the ribbed steel mesh should be lower than the road elevation. The ribbed steel mesh should be set up as an anti-crack steel mesh.
5. Concrete pouring and maintenance
Before pouring, plastic sheets should be laid on both sides of the joint to ensure that the concrete does not pollute the road surface.
When vibrating concrete, it should be done on both sides at the same time. To ensure that the concrete is dense, use a vibrating rod to vibrate until there are no more bubbles.
After the concrete is vibrated and compacted, use a trowel to rub out the cement slurry in batches and smooth it out as usual. In this process, special attention should be paid to the flatness of the concrete surface, which is slightly lower than the top surface of the asphalt pavement - too high or too low will cause the car to jump.
After the cement concrete pouring is completed, it is then covered with sacks or grass thatch and sprinkled with water strictly for a curing period of not less than three days. Vehicles are strictly prohibited during the health care period.
6. Install the rubber waterstop on the expansion joint: After the concrete is poured and vibrated, install the rubber belt and the stainless steel expansion joint plate slightly higher than the road surface - compact the plate body so that there are no gaps and tighten it after the strength reaches %. Fasten the bolts. When the expansion joints are installed, continue the curing period for no less than one week.
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