Professional rubber bearing manufacturer Jinpeng is trustworthy

Support means to support container Or the weight of the equipment, and the supporting parts which are fixed at a certain position, should also bear the vibration and seismic load during operation. Rubber bearings are rubber and thin steel plate Tightly combined to support the weight of the bridge.

Laminated rubber bearing

The plate rubber bearing consists of multiple layers Natural rubber It is embedded, bonded and vulcanized with thin steel plate to form a bridge bearing product.

This type of rubber bearing has sufficient vertical stiffness to bear vertical load, and can reliably transfer the pressure of superstructure to the pier and abutment; It has good elasticity to adapt to the rotation of the beam end; Large shear deformation to meet the requirements of superstructure

Laminated rubber bearing

Horizontal displacement; Plate bearings are divided according to shape:

Rectangular plate, round, spherical crown plate, circular plate slope, and other products.

1. Rectangular (round) plate

(1) Performance: This product is made by inlaying multilayer rubber sheets and thin steel plates, bonding them to a certain pressure, temperature and time, and vulcanizing and pressing them. There is sufficient vertical stiffness to bear the vertical load, which can reliably transfer the reaction force of the beam slab superstructure to the pier and abutment, and has good elasticity to adapt to the rotation of the beam end; There is also a large shear deformation to meet the horizontal displacement of the upper beam structure.

(2) Features: This product has been widely used in bridge construction, hydropower engineering, and building seismic facilities. Compared with the original steel bearing, it has simple structure and convenient installation; Steel saving and low price; It has the advantages of simple maintenance, easy replacement, and low building height, which is beneficial to bridge design and cost reduction; It has good isolation effect and can reduce the impact of live load and seismic force on buildings.

2. Polytetrafluoro ethylene Skateboard type

It is called tetrafluoro sliding plate bridge bearing for short. This product is made by bonding a layer of 1.5-3mm thick polytetrafluoroethylene plate on the ordinary plate rubber bearing. In addition to the vertical stiffness and elastic deformation of ordinary plate rubber bearings, which can withstand vertical loads and adapt to the rotation of beam ends, the low friction coefficient (μ ≤ 0.06) between tetrafluoroethylene and the stainless steel plate at the bottom of the beam can make the horizontal displacement of the bridge superstructure unrestricted, and long-span bridges with a span>30m, simple supported beam continuous slab bridges and multi span continuous beam bridges can be used as movable bearings; Continuous beam pushing, t-beam transverse moving and large equipment sliding can be used as sliding blocks.

3. Spherical crown round plate bearing

Features: This product is improved from the circular plate bearing. The layout of interlayer rubber and steel plate is exactly the same as that of the circular plate bearing. The spherical star made of pure rubber on the top surface of the bearing indicates that the greater thickness of the rubber in the center of the spherical surface is 4-10mm. The spherical crown circular plate rubber bearing has uniform force transmission, which can significantly improve or avoid the adverse phenomena such as eccentric pressure and void on the bottom surface of the bearing. It is especially suitable for overpasses and viaducts with large vertical and horizontal slopes (3% - 5%).

The top surface of the bearing is a pure rubber spherical surface, and a circle of R2.5 mm semi-circular ring is added at the bottom of the bearing. It retains the advantages of isotropic deformation of circular plate bearing, and can overcome the phenomenon of bias pressure and void after installation. It is suitable for general small span bridges, as well as various overpasses and viaducts with complex layout and large longitudinal slope. The spherical crown radius and the overall thickness of the support can be adjusted according to different slopes.

4. Classification by material:

a： Neoprene Applicable temperature: 60 ℃ to - 25 ℃

b: Natural rubber: applicable temperature: 60 ℃〜 - 40 ℃

c: EPDM: applicable temperature: 60 ℃ 〜 - 45 ℃

5. Selection, installation and maintenance

1) Selection

a: Check the installation and construction drawings of the plate rubber bearing, and mainly pay attention to the specifications, models, height, bearing capacity and other main technical parameters of the plate rubber bearing. The size, installation position and direction of the embedded steel plate shall also be paid attention to for the rubber bearing of the PTFE sliding plate;

b: When the plate rubber bearing is selected, the larger bearing capacity of the bearing shall be consistent with the reaction force of the bridge fulcrum, and the allowable deviation range should be ± 10%;

c: For curved, sloping, inclined and wide bridges, circular plate rubber bearings should be selected. Rubber bearing with spherical crown or slope shape should not be used in highway bridge engineering;

d: When the longitudinal slope gradient of the bridge is not more than 1%, the plate rubber bearing can be directly set on the pier and abutment, but the thickness required by the longitudinal slope shall be considered. When the longitudinal slope gradient is greater than 1%, the beam bottom shall be leveled with embedded steel plates (with wedge-shaped steel plates), concrete cushion blocks (with gradient cushion stones) or other measures to ensure that the supports are flat. The plate rubber bearing shall be checked according to the relevant provisions of JTG D62 and can be used only after the checking meets the specified requirements.

e: GJZF4 and GYZF4 PTFE sliding plate rubber bearings shall be installed horizontally. The upper and lower steel plates shall be set. 5201-2 silicone grease lubricating oil shall be applied between the PTFE sliding plate and the stainless steel plate. After installation, the dust cover must be set; The PTFE sliding plate of the bearing shall not be set on the bottom of the bearing, and the stainless steel plate in contact with the PTFE sliding plate shall not be set on the bridge pier and abutment pad stone.

2) Installation

a: Installation preparation

a. 1 Bearing pad stone should be set at the installation place of plate rubber bearing. The plane size of the bearing pad stone should be determined according to the local pressure calculation. The length and width of the pad stone should be at least 50 mm more than the corresponding size of the bearing, and its height should be more than 100 mm, and it should be considered to facilitate the replacement of the bearing.

a. 2 Reinforcement mesh shall be arranged in the bearing pad stone. When the diameter of reinforcement is 8mm, the spacing should be 50mm × 50mm. There should be vertical reinforcement extending into the bearing pad stone in the bridge pier and abutment. The concrete strength grade of the bearing pad stone should not be lower than C30.

a. 3 The surface of bearing pad stone shall be flat, clean, dry and free of floating sand. The elevation of the top surface of the bearing pad stone is required to be accurate. Under the condition of flat slope, the bearing pad stone at both ends of the same beam and the bearing pad stone on the same pier and abutment shall be in the same design elevation plane, and the relative height difference shall not exceed ± 1.5 mm, and the height difference of the same bearing pad stone shall be less than 0.5 mm.

b: Support installation

b. 1 After entering the site, check whether there is manufacturer's trademark or long-term mark on the bearing. During installation, the center line of the bearing position shall be marked on the bearing pad stone and the bearing according to the requirements of the design drawing to ensure the accurate positioning of the bearing.

b. 2 When installing the bearing, it is necessary to prevent the bearing from bias pressure or excessive initial shear deformation. After installation, it must be ensured that the bearing is in close contact with the upper and lower structures and there is no void. For beam and slab structures that do not form a whole, heavy vehicles shall be avoided.

b. 3 The design of bridge piers and abutments shall consider the needs of bearing maintenance and replacement. In any case, two or more supports are not allowed to be installed side by side at the same bearing point along the longitudinal centerline of the beam; On the same beam (slab), more than two supports should not be set horizontally; Supports of different specifications shall not be installed side by side.

b. 4 After the installation of the support, it is necessary to check whether there is any omission of the support, whether there is any error in the direction and position of the support installation (contact with the embedded steel plate, the position of the support centerline), the specification and model of the support, whether the temporary fixed facilities are removed, whether the tetrafluoroslide support is injected with silicone grease (it is strictly prohibited to use lubricating oil instead of silicone grease), etc. Once found, it should be adjusted and handled in a timely manner, Ensure the normal operation of the support after installation, and record all deviations and abnormalities after installation of the support.

b. 5 Average compressive stress σ c=10MPa in the use stage of bearing. The volume of rubber elastomer of support Eb=2000MPa.

When the bearing contacts the concrete, the friction coefficient μ=0.3; When contacting with steel plate, the friction coefficient μ=0.2; The friction coefficient μ f of polytetrafluoroethylene plate in contact with stainless steel plate (when silicone grease is added) is 0.06. When the temperature is lower than - 25 ℃, the μ f value increases by 30%, and when no silicone grease is added, the μ f value should be doubled.

b. 6 The rectangular bearing shall be installed along the bridge with the short side size.