Basic Info.
Model NO.
High bearing bridge support
Specification
Bridge isolation rubber bearing
Product Description
Bridge bearing is an important structural component connecting the bridge superstructure and substructure. It can transfer the reaction force and deformation (displacement and corner) of the bridge superstructure to the bridge substructure reliably, so that the actual force situation of the structure is in accordance with the calculated theoretical diagram.A device erected on a pier and supported on the top surface of the bridge superstructure. Its function is to fix the superstructure on the pier, bear the various forces acting on the superstructure and transmit it to the pier reliably; under the action of load, temperature, concrete shrinkage and creep, the bearing can adapt to the corner and displacement of the superstructure, so that the superstructure can be freely deformed without additional additional internal forces.Bridge bearing construction should be in line with the theoretical calculation of the upper structure, such as bearing pressure through a fixed point of transmission, bearing should be designed to allow only the structure end rotation and can not move the fixed bearing; such as bearing pressure through a fixed point and the role in a certain direction of transmission, should be designed to both rotate and move the movable bearing. Beam bridge bearing has horizontal two-way fixed bearing (i.e. fixed bearing), horizontal two-way movable bearing (or two-way movable bearing), horizontal always fixed always movable bearing (i.e. movable bearing) three, its arrangement according to the width of the bridge. In the narrow bridge generally only require free expansion and contraction movement along the direction of traffic, its various types of bearing arrangement as Figure 1a; in the wide bridge, because the upper structure transverse deformation is also larger, it is required to be arranged in accordance with the way Figure 1b.Bridge bearingBearing is an important transmission device of the bridge, the design should be considered in addition to its adequate strength, stiffness and free rotation or movement performance, should also pay attention to facilitate maintenance and replacement, construction should pay attention to the seat under the concrete pad leveling, and should be determined according to the temperature of its placement; in the earthquake zone should be considered seismic measures. ClassificationAccording to the possibility of deformation, the materials used, structural form of three methods of classification.(A) according to the possibility of bearing deformation classificationGrid rubber bearingGrid rubber bearing1) Fixed bearing;2) One-way movable bearing;3) Multi-way movable bearing.(B) According to the classification of the materials used in the bearing1) Steel bearing: flat bearing, curved bearing, rocking shaft bearing, roller bearing.2) Whether with sliding ability to divide the bearing: sliding bearing, fixed bearing.3) Rubber bearing: plate rubber bearing (including teflon sliding plate rubber bearing), basin type rubber bearing, lead core rubber bearing, [1] high damping vibration isolation rubber bearing.(C) according to the structural form of bearing classificationSpherical bearingSpherical bearing1)Arc bearing2)Rocking shaft bearing3)Roller bearing4)Plate type rubber bearing and teflon version rubber bearing5)Basin type rubber bearing6)Spherical steel bearing7)Tension bearing, etc.Bridge bearing types are many, mainly according to the support reaction force, span, building height and expected displacement to select.Traditional common bridge bearings are: bedding bearing, flat bearing, curved bearing, rocking shaft bearing, hinged fixed bearing and hinged roller bearing, etc.(1)Bedding bearing. Made of linoleum or asbestos sheet to support the superstructure, used for span less than 6 meters (railroad bridge) or 10 meters (highway bridge) of simple support plate bridge and beam bridge.(2)plate bearing. By the upper and lower two flat cast steel plate (seat plate), for span less than 8 meters or 12 meters of beam bridge. Between the seat plate, such as the addition of pins, can constitute a fixed bearing.(3)Arc bearing. The movable bearing is changed from the lower seat plate in the flat bearing to the arc panel (Figure 2a), can improve its slip and rotation performance, used for span less than 20 meters of public and railroad bridge. In the seat plate between the addition of pins into a fixed bearing.(4)Rocking shaft support. With cast steel rocking shaft and the upper and lower seat plate composition (Figure 2b) of the movable bearing, used for medium span beam bridge.(5)Hinge type fixed bearing. Composed of cast steel upper and lower pendulums (Figure 2c), with a pendulum card embedded between the two pendulums to control lateral sliding. Is used for large span beam bridge fixed bearing.(6) Hinged roller bearing. In the hinged fixed bearing under the pendulum with forged steel roller shaft and cast steel seat plate (Figure 2d), the number and size of the roller shaft according to the size of the support reaction force to determine. Commonly used in the large span beam bridge movable bearing.(7) Two-way movable bearing. It is composed of two layers of hinged roller bearings which are stacked on top of each other and can roll in two orthogonal directions, and is used for large width girder bridges. LayoutThe arrangement of the bridge bearing is mainly related to the structural form of the bridge. Usually, the following basic principles need to be considered when arranging bearings:(1) When the superstructure is a space structure, the bearing should be able to adapt to the deformation of the bridge in both the cis-bridge direction (X direction) and the cross-bridge direction (Y direction);(2) The bearing must be able to reliably transfer the vertical and horizontal reaction force;(3) The bearing shall be such that the longitudinal displacement, transverse displacement and longitudinal and transverse corner resulting from the deformation of the beam shall be unrestrained as far as possible;(4) Bridges shall normally be provided with one fixed bearing per girder;(5) When the bridge is located on a ramp, the fixed bearing shall generally be located on the bridge deck in the downhill direction;(6) When the bridge is located on a flat slope, the fixed bearing should be located on the front deck in the main traffic direction;(7) fixed bearing should be set in the place with a large bearing reaction force;(8) Several bearings on the same pier should have similar rotational stiffness;(9) continuous beam may occur bearing subsidence, should consider the possibility of making height adjustment.In short, the bridge bearing arrangement principle is to facilitate the transfer of bearing reaction force, but also to make the bearing can fully adapt to the free deformation of the beam body. InstallationBridge bearingBridge bearing(1)Before the installation of the bearing should be measured to check the installation position of the bearing, bearing installation plane should be parallel to the sliding plane or rolling plane of the bearing, and the deviation of its parallelism should not exceed 2‰.(2) bearing should be installed before the movable bearing top, bottom plate relative position to check.(3) bearing installation, rolling and sliding plane should be level, its slope with the theoretical plane is not more than 2 ‰. Bearing upper and lower plate center should be in, its deviation is not more than 2‰.(4) In order to ensure the bearing installation level, generally should be in the bearing bottom surface and support the top surface of the stone, pounding 20 ~ 50mm thick dry hard non-shrinkage mortar bedding layer.In order to ensure the construction quality of the bridge bearing, as well as the installation, adjustment, observation and replacement of the bridge bearing convenience, regardless of the cast-in-place method or prefabricated beam method construction, regardless of the type of bridge bearing installed, the top of the pier set support mat stone is necessary. Construction risks1 bridge bearing installation operation process should consider the following main sources of danger, hazards:(1) The top of the pier is not set railings, steps and other safety protection facilities.(2) bearing in the pier roof storage is not firmly fixed.(3) the selected jack does not meet the construction requirements.(4) the top of the beam falls in violation of the operation(5) Construction site violations, fatigue operations.(6) bearing installation without windproof measures; no anti-skid measures in winter.2 bearing installation before the pier top and bearing anchor holes in the snow, ice, water and other debris should be cleaned up, and take the necessary anti-slip measures. Bearing in the pier top storage, to be fixed firmly.3 lifting support, pier top operators should be stable support and then hold in place. Manually lift the bearing, should be coordinated to prevent extrusion of hands and feet.4 Before lifting and erecting the simply supported beam, the bearing should be installed at the bottom of the prefabricated beam. There shall be no gap between the upper bearing plate and the pre-built steel plate at the bottom of the beam. After the grouting strength under the box girder bearing reaches 20MPa, tighten the anchor bolts of the lower bearing plate, and remove the upper and lower connecting steel plates and bolts of each bearing, and then remove the temporary jack.5 The hydraulic jacks used to jack down the beam must be accompanied by spherical support pad, insurance ring, lift limit hole. The common role of multiple jacks should be selected from the same type, and parallel connection with the oil pipe. Hydraulic jacks, oil pumps, oil pipes, pressure gauges, etc. should be tested separately before use.6 use jack to jack the beam to place the support, should be timely fall beam to the support, forbidden to use the jack to support the beam for a long time.7 When jacking down the beam, there should be insurance facilities, with the piston up and down in time to place or remove. Both ends of the pistons should not be dropped at the same time. When applying the top or moving longitudinally and horizontally, it should be slow and smooth, and each process should be checked by special person and unified command.
Address:
No. 22 Rubber Road, Hengshui City, Hebei Province, Hengshui, Hebei, China
Business Type:
Manufacturer/Factory
Business Range:
Industrial Equipment & Components, Instruments & Meters, Manufacturing & Processing Machinery, Tools & Hardware, Toys, Transportation
Management System Certification:
ISO 9001, GMP
Company Introduction:
Hengshui Runli Rubber New Material Technology Co., Ltd. Covers an area of 9, 500 square meters and currently has 166 employees, including 38 professional and technical personnel. Our company is a key manufacturer specializing in the production of rubber products and supporting products for transportation facilities. Its leading products have formed several categories such as bridge rubber bearings, expansion joints, water stop series. Special rubber products, etc., with more than 20 series of products and more than 1, 500 varieties. The products are exported to more than 20 provinces, cities and autonomous regions abroad and in China, and are well received and trusted by users. Our products are widely used in various bridge and tunnel projects such as highways, railways, and power plants, water plants, and sewage treatment. Plants and other large-scale engineering projects. The company always insists on improving quality and strengthening management as the core, stresses the economic principle of honesty and development, and establishes a scientific and complete quality management and guarantee system. The company wholeheartedly hopes the trust, support and cooperation of friends from all walks of life, through the full cooperation with new and old customers, to serve the transportation and construction industry of the motherland with high-quality products, and work hard to revitalize my country′s economic construction.
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