TJQZ-8360 spherical bearing for railway simply-supported beam bridge

1、 General

The design drawing of spherical bearings for railway bridges (TJQZ-8360) series products is a set of drawings completed on the basis of the Ministry of Railways' scientific and technological research and development plan project "Research on key technologies of new line construction - Experimental research on spherical steel bearings for railway simply-supported beam bridges (2010G016-F)", The installation dimensions (bolt hole position, bolt hole diameter) of the interface between the product and the beam are consistent with the general reference drawing of railway engineering (Tongqiao [2007] 8360) issued by the Economic Planning Institute of the Ministry of Railways, and are applicable to the commonly used span simply-supported beam bridges of new, reconstructed and expanded railway projects and existing railway reconstruction projects in China.

2、 Bearing performance

1. The vertical design bearing capacity of the bearing is divided into 12 levels: 1000, 1500, 2000, 2500, 3000, 350040004500, 5000, 5500, 6000, 7000kN.

2. Design horizontal force of bearing (main force):

The design horizontal force of fixed bearing, longitudinal movable bearing, transverse bridge direction and transverse movable bearing along the bridge direction is the vertical design bearing capacity of the bearing:

15% - the area where the design peak ground motion acceleration Ag ≤ 0.1g;

22.5% - the area where the design seismic peak acceleration is 0.1g ＜ Ag ≤ 0.15g;

30% - the area where the design peak ground motion acceleration is 0.15g ＜ Ag ≤ 0.2g;

45% - area with design peak ground motion acceleration of 0.2g ＜ Ag ≤ 0.3g;

The design horizontal force of the multidirectional movable bearing in all directions, longitudinal movable bearing along the bridge direction and transverse movable bearing in the bridge direction is 5% of the vertical design bearing capacity of the bearing.

3. Design displacement of bearing:

Design displacement of multidirectional movable bearing (DX) and longitudinal movable bearing (ZX) along the bridge direction:

± 50mm when the vertical bearing capacity is 1000~3000KN;

The vertical bearing capacity of 3500~7000KN is ± 60mm;

The design displacement of multidirectional movable bearing (DX) and transverse movable bearing (HX) in transverse bridge direction is ± 10mm.

When the required displacement is greater than the above value, it can be designed separately.

4. Design friction coefficient of movable bearing with silicone grease lubrication:

Normal temperature (- 25 ℃~60 ℃): μ≤ 0.03；

Cold resistance (- 40 ℃~- 25 ℃): μ≤ 0.05。

5. Design angle of support: 0.02rad.

6. Prefabricated and erected simply-supported beam bridge adopts the method of changing the slope of the top surface of the upper support plate to meet the slope requirements of the beam body:

I0 ― no slope is set on the top surface of the upper bearing, which can adapt to the longitudinal slope range of the line 0 ‰ ≤ i ≤ 4 ‰;

I8 ― The top surface of the upper bearing is set with a gradient of 8 ‰, which can adapt to the longitudinal gradient range of the line of 4 ‰ ＜ i ≤ 12 ‰;

I16 ― The top surface of the upper bearing is set with a gradient of 16 ‰, which can adapt to the longitudinal gradient range of the line 12 ‰ ＜ i ≤ 20 ‰;

Ixx - the top surface of the upper bearing is set with a gradient of xx ‰, which can adapt to the longitudinal gradient of the line of xx ‰, 20 ‰ ＜ xx ‰ ≤ 30 ‰. When the top surface of the upper bearing is set with a gradient of xx ‰, if the thickness of the thin end of the bearing plate is less than 20mm along the bridge, the thickness of the plate should be increased to ensure that the thickness of the thin end of the bearing plate along the bridge is not less than 20mm, and the bearing assembly height should be increased accordingly, and the size change should be communicated with the supplier.

7. Height adjustment of reserved base plate of support: reserved height adjustment of bolt is 20mm.

8. Applicable temperature range:

Normal temperature bearing (C): - 25 ℃~+60 ℃;

Cold resistant bearing (F): - 40 ℃~+60 ℃.