What are the applications of comb plate expansion device in road engineering
The comb plate relies on the sliding of meshing steel plates to adapt to the expansion and contraction of the beam body, with an expansion range of 40-1000mm. It has smooth driving, good noise reduction effect, strong bearing capacity, and can adapt to multi-directional displacement. It is divided into two major sections: new construction and old bridge renovation.
The comb plate relies on the sliding of meshing steel plates to adapt to the expansion and contraction of the beam body, with an expansion range of 40-1000mm. It has smooth driving, good noise reduction effect, strong bearing capacity, and can adapt to multi-directional displacement. It is divided into two major sections: new construction and old bridge renovation.
1、 Highway engineering
1. Expressway bridge, first-class highway overpass bridge
Continuous beam bridges, interchange ramp bridges, inclined bridges, and curved bridges are preferred for selection; The truck traffic is heavy, and the Q355 high-strength comb plate can withstand the impact of heavy-duty vehicles; The long connecting beam has a large expansion and contraction capacity (80-400mm). Compared with modular expansion joints, it has less bumps for vehicles passing through and is safe for high-speed traffic; Coastal highways use stainless steel comb plates to resist corrosion from melting snow salt and salt spray.
2. National and provincial highways, freight lines, mining area roads and bridges
Industrial zones, port freight channels, long-term heavy vehicle traffic, thickened comb plates to resist fatigue; For curved and sloping bridges, comb plates can adapt to longitudinal, transverse, and vertical multi angle deformations without the problem of expansion joint jamming failure.
3. Connection parts at the entrance and exit of the tunnel
Solve the problems of uneven settlement and temperature expansion of tunnel structures and bridge subgrades, and improve the smoothness of driving at tunnel entrances.
2、 Municipal road engineering
1. Urban expressways, inner ring elevated roads, urban main road bridges
Core selection of roads around residential areas; The top surface of the comb plate is flat, resulting in low noise when vehicles pass by and reducing disturbance to residents; Frequent starting and stopping of buses, dispersed wheel load by toothed plates, and longer service life; Customized processing of comb plates for wide bridge deck and irregular ramp bridge to adapt to the width of the bridge deck.
2. Urban interchanges, interchange ramp bridges, and river crossing bridges
Small radius curved bridges, skew bridges, traditional modular expansion joints are prone to jamming, and multi-directional displacement comb plates are suitable for torsional displacement; Large displacement comb plate is selected for the cross river bridge and long continuous beam; Steel box girder bridges commonly use comb plate expansion devices.
3. Pedestrian overpasses, landscape bridges, and riverside park bridges
The bridge deck is flat and beautiful; The pedestrian load is relatively light, and a lightweight comb plate is selected; Park corridors and pedestrian overpasses, balancing comfortable traffic and overall appearance.
3、 Old Bridge Renovation Project
1. Replacement of expansion joints in old bridges
The depth of the comb plate burial (shallow groove installation) eliminates the need for extensive concrete removal and deep excavation of old grooves on the original bridge deck, shortening the construction time for road closure; Adopting the anchoring method of planting reinforcement to adapt to the original reserved position; A single comb plate can be replaced separately, and there is no need to remove the expansion joint as a whole for later maintenance, resulting in low maintenance costs.
2. Road reconstruction and expansion, bridge widening projects
After widening the old road, the settlement of the new and old beams is inconsistent, and the comb plate can adapt to the slight displacement deformation of the new and old structures; After the upgrade of the old bridge, heavy-duty trucks will continue to pass through.
4、 Rail transit supporting road engineering
Subway and light rail elevated bridges: adapted to high-frequency impact loads of trains, meeting longitudinal expansion, lateral displacement, and corner deformation requirements;
The high-speed railway station is equipped with supporting roads, hub connecting line bridges, and can accommodate the passage of private cars, buses, and heavy-duty buses.
5、 Special working condition road project
1. Roads and bridges in northern high-altitude regions
Select cold resistant rubber water stop components, and heat treat the comb plate to adapt to low temperature environments in winter;
2. Lingang Port Road and Bridge: 304 stainless steel comb plate, resistant to seawater salt spray corrosion;
3. Small river crossing bridges for park roads and internal roads in the factory area: Small and medium span simply supported beam bridges with small expansion and contraction, and economical comb shaped plates can meet the needs of use.
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