Main cable layered anti-sliding structure for main saddles of suspension bridge

Abstract

The invention discloses a main cable layered anti-sliding structure for main saddles of a suspension bridge, the main cable layered anti-sliding structure is arranged on the main saddles of the suspension bridge and provides additional anti-sliding friction function for main cables. The main cable layered anti-sliding structure comprises friction clamping plates and sliding-resistant devices, the multiple friction clamping plates are arranged inside a main saddle trough, the upper and lower surfaces of the friction clamping plates are curved surfaces capable of being in close contact with cable strands, and a main cable is divided into an upper layer cable strand (2) and a lower layer cable strand (3). The two sliding-resistant devices are symmetrically arranged on both ends of the upper part of a main saddle, and clamp the upper layer cable strand through fastening bolts (9) and prevent the upper layer cable strand from sliding in a longitudinal direction. The main cable layered anti-sliding structure can improve the level of anti-sliding of the lower layer cable strand, and prevents the upper layer cable strand from the risk of first sliding due to poor anti-sliding ability, has the advantages of being clear in fortification goal, simple in stress relation, good in operation capability and the like, and is particularly suitable for multi-tower suspension bridge structures.

Description

technical field [0001] The invention belongs to the technical field of suspension bridges, and in particular relates to a main saddle used for anti-skidding of main cables. Background technique [0002] The main cable is the lifeline of the suspension bridge, and it realizes the continuous curve transition between the spans through the main saddle on the top of the bridge tower. In order to ensure the structural safety of the whole bridge, relative displacement between the main cable and the main saddle is not allowed, which requires sufficient anti-slip friction between the main cable and the main saddle. [0003] The multi-tower suspension bridge is an ideal bridge type across wide waters such as bays and straits, and has great development prospects. However, for this type of bridge, there is a traffic situation where one side of the middle tower is fully loaded and the other side is empty. The ability to put forward very demanding requirements, and the conventional form...

AI Technical Summary

Problems solved by technology

However, compared with the huge radial force generated by the main cable itself, the additional pressure is very limited, and there is an obvious time-varying attenuation during the service period, so this anti-skid method is not reliable; Set multiple vertical plates or horizontal plates, relying on increasing the friction surface to improve the anti-skid ability of the main cable

In fact, due to the large difference in the anti-slip performance of the main cable strands from top to bottom, the top strands will slip first due to the smallest anti-slip friction force. Therefore, it is difficult to ensure the overall anti-slip safety of the main cable; ③ By weakening the stiffness of the middle tower, the possible force difference of the main cable can be reduced, thereby avoiding the risk of main cable slippage, but this treatment method will reduce the safety of the whole bridge. Structural rigidity and wind resistance stability will also significantly increase the project cost, so this approach is not a favorable solution

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