What is the function of bridge Expansion joint? How to maintain it?

In order to meet the requirements of deck deformation, Expansion joint are usually set between two beam ends, between beam ends and abutments, or at the hinge position of the bridge. The Expansion joint is required to be flexible, firm and reliable in two directions parallel to and perpendicular to the bridge axis, and the vehicle shall be stable without sudden jump and noise when driving; It should be able to prevent the infiltration and blockage of rainwater and garbage; Installation, inspection, maintenance, and removal of dirt should be simple and convenient. When setting Expansion joint, the railing shall be disconnected from the deck pavement. Generally speaking, the bridge Expansion joint is mainly used to prevent the pavement structure from Thermal expansion due to temperature changes. In order to reduce earthquake disasters, Expansion joint also play a role in preventing excessive displacement of beams. In short, it is a device for buffering displacement.

2023-06-27

What are the characteristics of the bridge Expansion joint and how to maintain it

The damage of the bridge expansion joint not only affects the driving comfort, but also causes damage to other components, bringing hidden dangers to the safety of the bridge. The rubber strip of the Expansion joint is damaged, the debris on the road falls into the Expansion joint, and the Expansion joint cannot expand freely. When the temperature changes, it will compress the beam head or platform back, and compress the beam head or platform back. Therefore, maintenance measures should be taken.

2023-06-27

Oil resistant rubber plate testing, how is it different from ordinary plates

The use conditions of rubber sheets are very relaxed, and they can be used for a long time both indoors and outdoors. Rubber sheets can produce many special properties and applications, which are important factors for the development of the rubber sheet industry (such as highly insulated rubber sheets, anti-static rubber sheets, high-temperature rubber flooring, oil resistance, acid and alkali resistance, etc.). So, today we will introduce the characteristics of oil resistant rubber plate inspection and distinguish it from ordinary rubber to help you better understand. Rubber products come into long-term contact with oil media during use, and oil can penetrate into the interior of the rubber, causing expansion, thereby reducing the strength and other mechanical properties of the rubber. Oil can dissolve rubber because after oil penetrates the rubber, molecules diffuse and the network structure of vulcanized rubber changes. According to the oil resistance of rubber and the polarity of rubber and oil, rubber molecules contain polar groups (such as bromine, ester, bromine, chlorine atoms, etc.), and rubber can display polarity. When rubber with high polarity comes into contact with non polar petroleum oils, the polarity difference between the two is significant, and rubber is not prone to expansion. It has good oil resistance to non-polar oils such as Nitrile rubber, hydrogenated Nitrile rubber, acrylic rubber, chlorohydrin rubber, chlorosulfonated polyethylene rubber, fluororubber, fluorosilicone, etc.

2023-06-27