What are the advantages of comb plate expansion device
The comb plate expansion device has significant advantages in bridge engineering, as follows:
1、 Deformation adaptation and scope of application
Large displacement adaptation: The design allows for expansion and contraction of 40-1000mm, which can partially accommodate larger displacements (such as 400-2000mm or even higher), far exceeding ordinary rubber expansion joints (≤ 200mm). It can cope
The comb plate expansion device has significant advantages in bridge engineering, as follows:
1、 Deformation adaptation and scope of application
Large displacement adaptation: The design allows for expansion and contraction of 40-1000mm, which can partially accommodate larger displacements (such as 400-2000mm or even higher), far exceeding ordinary rubber expansion joints (≤ 200mm). It can cope with large temperature differences, displacement of long span bridges due to temperature, concrete shrinkage and creep, and avoid structural damage. It is commonly used in long-span bridges such as cable-stayed bridges and suspension bridges.
Multi directional deformation compatibility: In addition to longitudinal displacement, it also adapts to lateral swing and vertical angular deformation (angle ≤ 3 °), and is suitable for complex bridge types such as curved bridges and ramp bridges, ensuring normal operation during bridge deformation.
2、 Structural strength and load-bearing capacity
Material mechanics advantages: The main body is made of high-strength metals such as Q345 steel, stainless steel, or aluminum alloy, with a tensile strength of ≥ 345MPa and a compressive strength of ≥ 500MPa. It can withstand repeated rolling of heavy-duty vehicles (such as heavy-duty trucks and rail transit) and is not easily broken or deformed.
Rigid connection design: It is firmly connected to the pre embedded steel bars of the bridge through bolts or welding to form a rigid structure as a whole, with direct load transmission, solving the problem of insufficient bearing capacity caused by elastic deformation of rubber expansion joints.
3、 Durability related
Outstanding corrosion resistance: Made of stainless steel comb teeth (304, 316 stainless steel, etc.) or hot-dip galvanized steel (zinc layer thickness ≥ 85 μ m), the corrosion resistance is 5-10 times higher than ordinary steel in harsh environments such as acid rain and salt spray (coastal and industrial polluted area bridges), with a service life of 20-30 years, far exceeding rubber expansion joints (10-15 years); The surface of the comb teeth can also be sprayed with fluorocarbon paint to enhance their resistance to UV aging.
Good wear resistance: The hardness of metal comb teeth (HB ≥ 180) is much higher than that of rubber, and vehicles are not easily worn or torn after repeated rolling. It is suitable for bridges with high traffic flow (daily traffic flow>50000 vehicles).
4、 Drainage and blockage prevention
Efficient drainage: The comb teeth gap is usually inclined at a 45 ° angle, and when combined with the bottom drainage groove, it can guide rainwater and snowmelt water to be directly discharged outside the bridge. The drainage efficiency is increased by more than 30% compared to traditional expansion joints, reducing steel corrosion, concrete freeze-thaw and other diseases.
Anti clogging by debris: A larger comb gap (such as 20mm) can prevent the accumulation of leaves, gravel, and other debris, reducing maintenance and cleaning frequency. Traditional rubber joints need to be cleaned 1-2 times a year, and comb plate joints need to be cleaned 2-3 years.
5、 Driving and Environmental Protection
Comfortable driving: The meshing surface is designed with smooth circular arcs (arc radius ≥ 5mm), and there is no obvious bumpy feeling when the vehicle passes through. The flatness error is ≤ 2mm (better than the 5mm error of rubber joints); Metal structure rigid connection reduces vibration noise (noise value ≤ 65dB, 10-15 dB lower than rubber joints), suitable for bridges near cities and residential areas.
Environmental friendly economy: The main materials (steel, aluminum alloy, etc.) can be 100% recycled and reused, with a recycling rate of over 90% after disposal, in line with the concept of green building (the recycling rate of rubber joints is only 30-50%); Although the initial procurement cost is 20-30% higher than that of rubber expansion joints, their long lifespan and low maintenance cost reduce their full lifecycle cost by more than 40%, making them suitable for large-scale projects.
6、 Construction and maintenance
Convenient construction: Modular design facilitates on-site installation, with a typical installation time of 1-2 days for single span bridges (3-5 days for rubber joints), and a relaxed temperature requirement for on-site construction (-20 ℃~50 ℃ can be used for construction), making it suitable for emergency repairs.
Easy maintenance: Regular checks on bolt tightness and cleaning of debris are required on a daily basis. Local comb teeth damage can be disassembled and replaced separately, reducing repair costs by 50% compared to rubber joints.
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