China since the 1960s began to develop, rectangular laminated rubber bearings and began to have a trial in Guangdong, Shanghai, Shandong, Guangxi, Fujian, Jiangsu, Zhejiang and Anhui provinces and parts of roads and bridges in 1995. The country's first trial of laminated rubber bearings in Guangdong Zhaoqing Highway bridge elastic damping slide ball bearing, has more than 40 years history of use of laminated rubber bearings have become widely used in highway and city bridges and culverts and popular A one form of support. China's first laminated rubber bearings content will be included in the 1975 issue of "Highway Bridge Design Code" (Trial) in 1980 to amend the "Highway Bridge Design Specifications" Ministry of Transportation Highway Planning and Design Institute commissioned the Shanghai Municipal Engineering Design Institute in performed on a batch 200t pressure testing machine mechanical testing activities laminated rubber ball bearing, test results into "machine prestressed concrete reinforced concrete highway bridge design specifications" (JTJ023-85) .1988 in traffic does not begin to develop the transportation industry standard "Road and Bridge laminated rubber bearing specifications series" (JT 3132.1-88), this series of specifications to comply fully with the provisions of JTJ 023-85 of the design. At the same time developed a "highway bridges laminated rubber bearings technical conditions" (JT 3132.3-88) and subsequently have developed a "highway bridges mechanical properties of laminated rubber bearings inspection rules" (JT 3132.3-90) bi-directional ball bearing activities, such rectangular laminated rubber bearing design, processing and use of a reliable basis. In traffic without attention and strong support, but also issued a circular experimental studies of laminated rubber bearings and experimental research on complementary rectangular laminated rubber bearing, the Ministry of Transportation Highway Planning and Design Institute has commissioned the Academy of Railway Sciences On the 500t and 2000t pressure testing machine batch round, rectangular and large-scale mechanical testing of laminated rubber bearings for continuous length larger bridge, fixed bearing should be located in the middle of the long bridge piers to reduce the amount of displacement at both ends of bearing. A bit line using the string, since the reaction temperature is not generated, and a small displacement amount, the disadvantage is the linear displacement of the beam due to the change so that the amount of the end portion of the mounting structure of the bridge is not parallel with respect to the bridge width, the beam spacing change not parallel beam bearing arrangement, according to Figure consideration, then, for any case in the same supporting line are arranged in a certain direction bearing hope. For overcoming the negative reaction force bearing arrangement, if the fulcrum negative reaction force, the structural part of the bridge will produce unpredictable stress QZ activity Sphere type support, so you must take special measures to set up more than two consecutive fixed bearing When the carriage, in addition to the horizontal forces due to temperature changes, the need to consider the horizontal force generated by the rotation of the beam. Hao-engineering rubber | elastic damping slide ball bearing | ball bearing activities provided by Hao-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!