Wedge steel plate manufacturer Yongsheng tells you about the main materials of bridge leveling steel plates
Are you afraid of getting into trouble when buying steel plates? A bridge made of the wrong material will have a short lifespan.
What is the difference between Q235 and Q345?
Q235 is an ordinary carbon structural steel with a yield strength of 235 MPa. It is divided into four grades: A, B, C, and D. The higher the grade, the better the low-temperature toughness. The sulfur and phosphorus content control of grades C and D is more stringent and is suitable for important projects. This steel has low cost and is easy to process. It is a common choice for bridge leveling slabs.
Q345 is a low-alloy high-strength steel. Its strength is much higher than that of Q235. It contains higher manganese content and has excellent comprehensive mechanical properties. When it is subjected to large loads or complex stresses, Q345 can provide better safety protection. Although the price is slightly more expensive, its durability is more worthy of trust for the leveling of key parts.
How to choose thickness specifications
Leveling steel plates are divided into different categories: medium plates, thick plates, and thin plates. When making a selection, you must check the specific design conditions of the bridge and the load requirements. Thin plates are generally used to adjust small displacements. Their construction is more convenient, but their stiffness has certain limits. The medium plate has the widest range of applications. It takes into account both strength and weight, and is suitable for the leveling needs of most conventional bridges.
Thick plates are used for long-span or heavy-load bridges, which can provide a larger support area and stability to prevent local collapse. The specifications provided by the manufacturer Yongsheng are diverse, and customers need to customize them according to the actual drawing dimensions. The appropriate thickness can ensure uniform stress on the supports and avoid deformation problems caused by insufficient plate thickness.
Differences between hot rolling and cold rolling processes
Steel plates are divided into hot rolling and cold rolling according to the rolling method. Hot rolling is formed under high temperature conditions. There may be oxide scale on the surface, but the internal structure is tight. It is suitable for manufacturing thick plates that require high strength. It has lower costs and higher production efficiency. For bridge leveling plates, hot rolling is a mainstream process and can meet most composition requirements.
Cold rolling is carried out at room temperature. Its surface is smooth and flat, and its corresponding dimensional accuracy is very high. However, it is generally only applied to relatively thin sheet parts, and its processing cost is relatively high. Within the specific field of bridge leveling, the use of cold rolling is relatively rare, unless there are special requirements for surface anti-corrosion or external appearance. In general projects, hot-rolled steel plates have become the first choice due to their cost-effectiveness.
For use with plate supports
Wedge-shaped steel plates are often used in conjunction with plate rubber bearings. The structure is relatively simple, the price is relatively low, and ordinary plate bearings do not require maintenance. When the sliding function needs to be added to the surface of the bearing, polytetrafluoroethylene plates are used for pasting. This combination can adapt to the rotation and horizontal displacement of the beam end, and is particularly suitable for bridge scenarios with small and medium loads and large displacements.
The friction coefficient of PTFE plates is extremely low, allowing the beam ends to slide freely, which can effectively release the stress caused by temperature changes, thereby protecting the bridge structure. Such products produced by Yongsheng have excellent performance. They are not only technologically advanced, but also have buffering and isolation effects. The installation height is low, making construction and maintenance easy, and are very popular among users.
Key items for daily inspection
Regular inspection of the condition of the bearings plays a vital role. First of all, you have to take a look to see if there is slippage or voiding, because this situation will affect the force balance. Secondly, check whether the shear displacement is too large, and the shear angle should not exceed 35 degrees. In addition, observation should be made to see the amount of compression deformation. Its value must not exceed 7% of the total thickness of the rubber layer to prevent bearing failure.
In addition, you should pay attention to whether the rubber protective layer has cracked and hardened, recorded the location and length of the cracks, and evaluated the degree of aging. For PTFE skateboard supports, you should check whether the skateboard is intact and whether there is peeling, confirm that the stainless steel plate has not slipped out, and that the oil storage pit filled with silicone grease is working normally to ensure smooth sliding without obstruction.
Manufacturer selection suggestions
When selecting a manufacturer, what you need to look at is qualifications and cases. As a professional manufacturer, Yongsheng provides a full range of materials from Q235 to Q345. They pay special attention to details, starting from the composition of the materials to the thickness control. When making purchases, customers should ask to see the quality inspection report to confirm that the chemical composition and mechanical properties are up to standard.
Don’t just look at the price, but also look at the cost-effectiveness. High-quality steel plates can keep bridges safe and stable for a long time. It is recommended to contact the manufacturer directly to obtain samples and detailed parameters. Make a wise choice by comparing the services and product quality of different manufacturers. After all, the quality of bridge projects is related to public safety and cannot be taken lightly.
Do you think, among the bridge leveling steel plates, which one, Q235 or Q345, will be more suitable for your project? Welcome to leave a comment to discuss, like and share more interesting content!
暂无评论内容