Plate rubber bearing price
Plate rubber bearing is a bridge bearing product made of multilayer natural rubber and thin steel plate embedded, bonded and vulcanized. This type of rubber bearing has enough vertical stiffness to bear vertical load and can reliably transfer the pressure of the superstructure to the pier; Good elasticity to adapt to the rotation of beam end; There is a large shear deformation to meet the horizontal displacement of the superstructure.
GYZF4 plate rubber bearing: ￥ 10? (Price source, for reference only).
Hengshui Bridge manufacturers sell plate rubber bearings: ￥35? (Price source, for reference only).
High quality Xinda supply basin rubber bearings? Bridge ￥ 10? (Price source, for reference only).
Installation mode of plate rubber bearing
A: Preparation for installation
A. 1 plate rubber bearings shall be equipped with bearing pads. The plane size of bearing bush should be determined by local pressure calculation. The length and width of the shim should be increased by at least 50mm compared with the bearing of corresponding size, and the height should be greater than100 mm. When replacing the top beam of the bearing, the installation position of the jack should be considered.
A.2 The cushion stone shall be decorated with steel wire mesh. When the rebar diameter is 8mm, the spacing should be 50 mm× 50 mm, and the vertical rebar should extend into the cushion stone in the pier and platform. The strength grade of the cushion stone concrete should not be lower than C30.
A.3 The surface of the cushion stone shall be smooth, clean, dry and free of quicksand. The elevation of the top surface of bearing pad stone should be accurate. In the case of flat slope, the bearing stones at both ends of the same beam and the bearing stones at the same pier should be in the same design elevation plane, and the relative height difference should not exceed 1.5? Mm, the height difference of the same cushion stone should be less than 0.5? Hmm.
B: support installation
b. 1？ After the bearing enters the site, check whether there is a manufacturer's trademark or permanent mark on the bearing. During installation, the center line of the bearing position should be marked on the bearing pad stone and bearing according to the requirements of design drawings to ensure the bearing is in place accurately.
b.2？ When installing the bearing, it should prevent the bearing from being offset or producing excessive initial shear deformation. After the installation is completed, it is necessary to ensure that the bearing is in close contact with the upper and lower structures, and there can be no holes. For beam-slab structures without integration, heavy vehicles should be avoided.
b.？ 3? The design of pier should consider the needs of bearing maintenance and replacement. In any case, two or more brackets are not allowed to be installed on the same support point side by side along the longitudinal center line of the beam; On the same beam (plate), it is not suitable to set more than two supports in the transverse direction; Bearings of different specifications should not be installed side by side.
b.？ 4? After the bearing is installed, it is necessary to comprehensively check whether there is any leakage on the bearing, the installation direction and position of the bearing (contact with the embedded steel plate and the position of the bearing center line), whether the specifications and models of the bearing are wrong, whether the temporary fixing facilities are removed, and whether silicone grease is injected into the tetrafluoroethylene skateboard bearing (lubricating oil is strictly prohibited to replace silicone grease). Once found, it should be adjusted and handled in time to ensure the normal operation of the bearing after installation, and record all deviations and anomalies after installation of the bearing.
b.5？ Average compressive stress σc= 10MPa in the service stage of bearing. Bearing rubber elastomer volume Eb=2000MPa.
When the bearing is in contact with concrete, the friction coefficient μ = 0.3; When contacting with steel plate, the friction coefficient μ = 0.2; The friction coefficient between PTFE plate and stainless steel plate (when silicone grease is added) is 0.06. When the temperature is below -25℃, the μf value will increase by 30%, and it will double when no silicone grease is added.
b.6？ During installation, rectangular bearings should be placed along the direction of the bridge, with short side dimensions.
Precautions in construction: keep the top surface of pier cushion stone clean. If the height difference of bearing cushion stone exceeds the standard requirements, the elevation must be adjusted with cement mortar. Mark the center on the bearing pad stone according to the design drawing. During installation, the center of rubber bearing should be consistent with the center line of bearing pad stone to ensure the bearing is in place accurately. Before pouring the beam, place a piece of supporting steel slightly larger than the plane of the bracket on the bracket. The plate is welded with the steel plate, the anchoring steel bar is connected with the beam body, and the supporting steel plate is used as the template for pouring the beam? A part is poured according to the above method, so that the bearing is closely attached to the steel plate at the bottom of the beam and the top surface of the cushion stone. Installation of rubber bearing of precast beam: The key to installing rubber bearing of precast beam is to ensure that the bottom of beam is parallel and flat with the top surface of cushion stone, so that it is closely attached to the upper and lower surfaces of bearing, and there can be no deviation, void and uneven bearing capacity. The construction procedure is as follows: transport the support cushion stone to make the elevation of the support cushion stone consistent. The bottom surface of the precast beam in contact with the support should be flat. When there is honeycomb slurry and inclination, it should be tamped and leveled with cement mortar in advance.
The correct positioning of rubber bearing first makes the bearing and cushion stone accurately positioned according to the design requirements. When the beam is erected and lowered, the longitudinal axis of the T-beam should coincide with the center line of the bearing; The longitudinal axes of plate girder and box girder are parallel to the center line of bearing. In order to accurately drop the beam, when erecting the first span plate beam or box beam, the center of the intersection position of the two supports can be drawn at the bottom of the beam, and the lead-out line of the center line of the two supports can be marked on the elevation of the beam end, so that the beam will coincide with the center line of the pier when falling. The following spans can be carried out according to the first span beam. When erecting beams, beams should be kept stable to prevent offset or initial shear deformation. You can refer to the specification table of rubber bearings for railway bridges. . When installing a T-bridge, if the rubber bearing is wider than the steel bar at the bottom of the beam, a reinforced concrete pad or thick steel plate larger than the bearing should be added between the bearing and the steel bar at the bottom of the beam as a transition layer to avoid bearing failure. Partial compression and stress concentration. Reinforced concrete pad or thick steel plate should be bonded with epoxy mortar and beam bottom reinforcement. After the beam falls, the top surface of the rubber bearing is generally flush with the surface of the beam. Prestressed simply supported beam, the top surface of its support can be tilted in the future; The top surface of the non-prestressed beam support can be slightly inclined forward, but the inclination angle shall not exceed 5 ".
The above is Bian Xiao's detailed knowledge about plate rubber bearings. I hope that through our sharing, you can better understand the plate rubber bearing. Plate rubber bearings are powerful and widely used in bridge construction, hydropower engineering, earthquake resistance of houses and other fields. And the plate rubber bearing is simple in structure and convenient to install. Simple maintenance and convenient replacement. Above, we have shared our knowledge about plate rubber bearings in great detail. I hope our sharing can help everyone.
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