What is the overall performance of the comb plate type expansion device
1. Core performance advantages
1. High load-bearing and impact resistance
The comb plate is made of Q355 steel or stainless steel, with a tooth design that disperses vehicle loads. It can withstand the high-frequency impacts from heavy-duty trucks and specialized vehicles, making it suitable for use on heavy-load bridges such as highways and urban arterial roads.
The anchoring syste
1. Core performance advantages
1. High load-bearing and impact resistance
The comb plate is made of Q355 steel or stainless steel, with a tooth design that disperses vehicle loads. It can withstand the high-frequency impacts from heavy-duty trucks and specialized vehicles, making it suitable for use on heavy-load bridges such as highways and urban arterial roads.
The anchoring system is rigidly connected to the bridge beam, featuring high tensile and shear strength, making it less prone to loosening and deformation under emergency braking and lateral loads.
2. Excellent ride comfort
After the comb teeth are engaged, the top surface is flush with the bridge deck pavement, with no obvious steps. The vehicle experiences less bumps during driving, and the noise is 10%–15% lower than that of modular expansion devices, enhancing driving comfort.
The expansion stroke is large (up to 400mm for a single unit, and multiple units connected in series can meet greater deformation requirements), and the sliding resistance is small, ensuring a smooth transition during large-span expansion of bridges.
3. Convenient installation and maintenance
Modular design eliminates the need for complex welding during on-site installation, allowing direct bolting and anchoring. The construction period is shortened by over 30% compared to modular expansion devices, with minimal impact on traffic.
Individual damaged comb plates can be replaced separately without the need for complete removal, resulting in low maintenance costs. This is suitable for bridge scenarios where rapid restoration of traffic is required.
4. Strong weather resistance
Stainless steel comb plates exhibit excellent corrosion resistance. In harsh environments such as coastal areas with high salt spray, or northern regions subject to erosion from ice and snow melting agents, their service life is extended by 2-3 times compared to ordinary steel expansion devices. Carbon steel comb plates, after hot-dip galvanizing treatment, can also meet the corrosion protection requirements of general bridges.
II. Performance shortcomings and limitations
1. Insufficient sealing performance
There are gaps between the comb teeth, which cannot completely prevent sediment, gravel, rainwater, and other debris from entering the interior of the expansion device. Long-term accumulation can easily cause the sliding parts to become stuck, affecting the expansion function. At the same time, rainwater infiltration may corrode the bearings and anchor bolts, reducing the durability of the structure.
2. The tooth root is prone to fatigue damage
Repeated vehicle loads acting on the root of the comb teeth can easily lead to stress concentration. If the material heat treatment process is not up to standard or the tooth design is unreasonable, phenomena such as tooth root cracking and tooth breakage may occur, especially under heavy-load and high-frequency traffic conditions.
3. Weak adaptability to low temperatures
In the severe cold regions of the north, the accumulated water in the gaps may freeze and expand, potentially squeezing and deforming the comb plates. When the ice and snow melt, the resulting ice-water mixture infiltrates the sliding surface, increasing frictional resistance and affecting the flexibility of expansion and contraction.
III. Direction of performance optimization
Structural improvement: Install rubber sealing strips or flexible dust covers in the comb teeth gaps to enhance sealing performance; optimize the tooth profile design, adopt a rounded tooth root transition to reduce the risk of stress concentration.
Material upgrade: The comb plate is made of high-strength wear-resistant steel (such as NM450) and coated with tungsten carbide on the surface to enhance its resistance to wear and impact; the support is made of polytetrafluoroethylene (PTFE) sliding plate to reduce the sliding friction coefficient.
Optimization of installation process: Strictly control the embedded depth and perpendicularity of anchor bolts, fill the anchor holes with epoxy mortar, enhance the bonding strength between the anchor system and the beam body, and prevent loosening.
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