Hao-engineering rubber | Fixed Ball bearings | ball bearings 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 bearings in China since 1960s started to develop, rectangular laminated rubber bearings, and the trial has started 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 roads and bridges, has been 40 years of history of use of laminated rubber bearings have become widely used in highway and city bridges and culverts, and one of the popular forms an abutment. In the 1975 publication of "Highway Bridge Design Code" (Trial) for the first time the contents of the laminated rubber bearing activities included two-way ball bearing, 1980 as amended, "Highway Bridge Design Specifications" Ministry of Transportation Highway Planning and Design Institute has commissioned Shanghai Municipal Engineering Design Institute on pressure testing machine 200t bulk mechanical properties of rubber plate test, the test results into the "machine prestressed concrete reinforced concrete highway bridge design specifications" (JTJ023-85) .1988 annual traffic does not begin to develop the transport sector Standard "highway 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), this rectangular laminated rubber bearings 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 laminated rubber bearing rectangular complement experimental research ball bearing, Ministry of Transportation Highway Planning and Design Institute has commissioned the railway Ministry of Science and Research Institute at the 500t and 2000t pressure testing machine batch round, rectangular and large-scale mechanical properties of laminated rubber bearing laminated rubber bearing test stand is usually divided into two non-stiffening stiffening drink holder. Only one non-stiffening rubber bearing, although under horizontal force bearings to meet the needs of the horizontal shear deformation, but bearing in vertical loads tend to produce vertical deformation. Larger this time, due to constraints bearing relatively small longitudinal slip ball bearing, and due to the incompressibility of rubber, rubber deformation only lateral expansion, there will be a larger convex drum at its surrounding rubber oil The tensile deformation, thereby generating stress aging. Such bearing on our roads and bridges is not recommended. In order to withstand large vertical loads can also meet the needs of horizontal displacement, the bridges are generally used stiffened laminated rubber bearing, rubber bearing stiffening plate stiffening material can be steel, glass fiber, cotton, nylon cloth, single Our bridge stiffening materials used in steel, other materials not recommended, since as a stiffening plate rubber under vertical loads, steel embedded rubber sheet rubber between the lateral expansion of the limit fixed convex spherical bearing drum, vertical deformation correspondingly reduced, thus greatly improving the bearing vertical stiffness. In this case, the sum total deformation bearing vertical deformation for each thin rubber sheet.