Why Is PTFE Plate Used For Bridge Bearing?

2020-03-23 13:27:35

With the development of transportation industry, PTFE Plate is used in more and more inclined bridges. The slope range of beam bridge is 1-4%, and the slope design of some special bridges is about 8%. More factors have been added to the design criteria of the supports due to the skew or gradual rise of the skew bridge. Part of the force perpendicular to the deck acts on the shear plane of the support. If the design fails to meet these forces, the bracket will generate excessive deformation if necessary, which will affect its performance and life. Polytetrafluoroethylene plate is used for bridges with a longitudinal gradient of 1% < 1 < 3%. After the rubber bearing is installed, wedge-shaped steel plate (or wedge-shaped concrete block) consistent with the longitudinal fracture of the bridge shall be placed between the bottom of the beam and the support, or the bottom of the beam end shall be treated accordingly to make the support flat, so as to prevent the shear effect of the vertical reaction force component on the support. These methods bring a lot of trouble to the construction and installation of bridge support, sometimes the treatment is not ideal. At present, bearing manufacturers can process and manufacture inclined plate rubber bearings with different specifications, slopes and modulus of elasticity (shape factor) according to the design and use requirements. The installation and construction of inclined bearing is based on the ordinary flat rubber bearing, and the installation method of bearing is acceptable. There is no need to prepare wedges at the bottom of the beam or carry out corresponding treatment, thus saving labor and materials, and simplifying construction. GPZ basin rubber bearing is a new type of bridge support, which is composed of steel and rubber. It has the characteristics of large bearing capacity, large horizontal displacement and flexible rotation. Compared with other similar pot bearings and cast steel roller bearings, it has the advantages of light weight, compact structure, simple structure, low building height and machinability. Convenient, save steel and reduce cost. It is an ideal bearing for long-span bridges. The bearing capacity can reach the level of 20000-50000kn, which can basically meet the needs of domestic large-scale bridge construction, and the service life can reach more than 50 years.

Plate rubber bearings can be divided into ordinary plate rubber bearings (GJZ series, gyz series, TCYB Series) and PTLE Plate rubber bearings (gyzf4 series, gjzf4 series, tcybf4 Series) and other products. This standard is applicable to rectangular and circular flat rubber bearings for highway bridges with bearing capacity less than 5000kN. Polytetrafluoroethylene plate and circular plate rubber bearing used for highway bridges are mainly suitable for highway bridges with bearing capacity less than 5000kN. The plate rubber bearing is produced in accordance with the standard JT / t4-2004 of the people's Republic of China for transportation industry.