Hao-brand telescopic device, GQF-C40 bridge expansion joints, bridge expansion joints Nanning provided by Hao-engineering rubber. We are Hengshui HaoTong Engineering Rubber Co., Ltd. (www.htgcxj.com) located at: Hebei Hengshui specializes in: grid bearings, bridge expansion joints, water stop, bridge bearings, rubber bearings, spherical steel bearing modulus Bridge Expansion Joints With the rapid development of devices and urban highway viaduct construction of bridge expansion joints, bridge of growing up to get a breakthrough, which requires reasonable to have a structure, a large displacement of the bridge expansion joint device meet the needs of this development. However, this type of expansion joint plate rubber products unit, it is difficult to meet the requirements of a large amount of displacement; steel type of expansion joint device, but also difficult to achieve sealed impermeable, and easy to impact on the vehicle, the impact of travel of the vehicle . Therefore, there has been a good use of shock-absorbing cushioning performance and easy to do the sealing rubber material, with high strength and good rigidity shaped steel combination, in the case of a large displacement of the vehicle load can withstand all types Modular bridge expansion joint device series . Such joints device structure is the same point: the V-shaped cross-section or other cross-sectional shapes of the rubber sealing strip (tape), scarfing on the composition of scalable edge sealing body shaped steel beams and the beams in the steel, special steel beam directly bear the load of the vehicle, and can be based on the amount of stretching required arbitrarily increase in steel beams and sealing tape (tape), processing and assembly into a variety of expansion joint device products. Its only difference is that the difference between the transmission mechanism in the form and principles of load-bearing shaped steel beams stretching force and passed on. Shaped Steel has steel welded by steel or with extrusion, but also by the car rolled steel rolling embryo forming or partial segments (layer) rolled welded forming. At present, China has achieved a special shaped hot-rolled steel integrally formed localization. In recent years the use of telescopic device, such as a rubber plate telescopic device or modulus telescopic device, but also because of this and other reasons GQF-F60 bridge expansion joints, a considerable part, has already destroyed a bridge expansion joint device in order to further understand the actual use situation and analyzes its damaged condition, in parts of the country were investigated. Some cities use the telescopic device case investigation. The total number of bridge management based on survey data in 1990, the Beijing Municipal Highway Administration, Tianjin bridge management and other 13 cities under the jurisdiction of the bridge is 2490. Telescopic device with several damaged bridges 271 GQF-C40 bridge expansion joints, accounting for 48.7% of the total surveyed the bridge. Overall, good rates telescopic device is not ideal, the situation is quite serious damage chlorine well, in addition to Beijing's 12 urban construction management department, by the end of 1989 to early 1990 on the jurisdiction of 242 bridges telescopic device collision investigated GQF-Z60 bridge expansion joints, bridge expansion intact 62, accounting for 26% of total survey usage bridge expansion were fact-finding, through to the 87 bridge expansion-site observations, photographs, records, while the reasons for the formation of disease were analyzed.