With the development of technology highway bridges, the type of bridge bearings are constantly updated and increased until the 1960s, the production of rubber bridge bearings, bearing a greater say in the type of highway bridges are almost always use reinforced concrete bearing steel bearing drink, almost small span bridges processes (such as oil blankets, etc.) with only a simple method. With the development of the chemical industry, the emergence of the use of PTFE slide rubber bearings drink plane sliding bearings, by the early 1960s began, laminated rubber bearings and rubber bearing basin gradually into the development and application, in particular to the 20th century, 80 to 90 years laminated rubber bridge bearings, have worked out a highway bridge culvert design standard drawings (1980). transportation industry standard "highway bridges laminated rubber bearing specifications series" (JT 3132.1-88), "Road and Bridge Plate rubber bearings technical conditions "(JT 3132.2-88)," highway bridge mechanical properties of the finished laminated rubber bearings inspection rules "(JT 3132.3-90) and" highway bridge pot bearings "(JT 3141-90) issued and implemented make pot bearings quickly become the main highway bridge abutment form. Abroad in the 1970s started to develop spherical bearings, and soon in the curved bridge applications. Germany prestressed concrete bridge built in recent decades has been the use of bearing condition survey results show that in 1964, 100 percent of the bridge with steel supports, from 1958 began to use pot bearings, 1970 after began extensive use of pot bearings PTFE slide-in bridge bearings, pot bearings and bearing all proportion the amount is growing. According to the method of construction of the bridge and construction phases, and sometimes have to consider the overall dead load and deformation caused by rotation of the beam. The following questions raised about the need to pay attention. (1) for the temperature range bearing displacement computing activities, the general should be based on the provisions of the relevant bridge design specifications or based on the measured data using. Displacement (2) rotating beams generated should consider the live load. (3) system and the rigid frame arch bridge bearing system, live loads due to temperature changes and sometimes along the along the bridge to produce large displacement, displacement of the pivot should be considered as the amount of displacement. (4) generally tend to consider only the amount of displacement of the displacement after completion, but there are also state construction as the case when the decision condition, it must attract attention. (5) the activities of the bridge supports, telescopic displacement caused by temperature changes with the upper structure and deflection, etc. generated on its calculation of the amount of displacement should be calculated according to the relevant provisions of the relevant highway bridge highway bridge design specifications. In calculating the amount of displacement, in addition to the theoretical amount of displacement, the lower part of the structure to resolve the error and installation of unexpected displacement, etc., must leave a certain amount of surplus. The design of the reaction force will encounter each bearing seat differences appear on the same big problem for such a case, usually in consideration of the bearing arrangement of the system when the bridge structure, so that it is not too large of a difference in reaction to adjustment. But when difficult adjustment more difficult, each bearing a large difference in the case of the reaction force is inevitable, according to the characteristics of the use of seat for processing, to attract attention. Hao-engineering rubber, PTFE slide bridge bearings, bridge bearings provided by Hao Yichun through engineering rubber. Search for "grid bearings, bridge expansion joints, water stop, bridge bearings, rubber bearings, spherical steel bearing" fly suppliers, network operators choose to have a full alliance Certified: Engineering Rubber Co., Ltd. Hengshui HaoTong (www.htgcxj.com), trustworthiness and reliability, "business alliance customer service" on page now click on live chat with us now!