Installing structure of cable strand in multi-tower suspension bridge cable saddle

Abstract

The invention discloses an installing structure of a cable strand in a multi-tower suspension bridge cable saddle, which comprises a cable saddle provided with a cable bearing slot and a cable strandarranged in the cable bearing slot; a layout structure of the cable strand in the cable bearing slot is separated into an upper cable strand and a lower cable strand by a friction structure; the upperpart of the friction structure is matched with the lower part of the upper cable strand, the lower part of the friction structure is matched with the upper part of the lower cable strand; the friction structure comprises a friction plate, and the side of the friction plate is connected with the slot wall of the cable bearing slot; the upper part and the lower part of the friction plate are concave and convex step faces which are provided with concave and convex steps in a staggering manner; a vertical friction face is formed by a face where the concave and convex step faces are in vertical contact with the cable strand, a horizontal friction face is formed by the face where the concave and convex step faces are in cross contact with the cable strand. Thus the installing structure providesadditional frictional force for the cable strand in the cable saddle and greatly improves the anti-slide ability of the cable strand; thus the anti-slide safety of the multi-tower suspension bridge is greatly improved.

Description

technical field [0001] The invention relates to the technical field of suspension bridges, in particular to an installation structure for cable strands in a saddle of a multi-tower suspension bridge. Background technique [0002] Suspension bridge is a suspension system that uses main cables and slings as stiffening beams to transfer loads to the middle main tower and anchorage. Among them, the middle main tower is used to support the main cable and transfer the load to the foundation through the foundation. A cable saddle is set on the main tower to provide support for the main cable and make the main cable change direction smoothly. [0003] Suspension bridges have great competitive advantages when crossing wide waters. Multi-tower suspension bridges have great development prospects due to their super spanning ability, but the live load during operation is the most unfavorable state (one span is fully loaded and the other is empty) in the middle bridge tower A huge unbala...

AI Technical Summary

Problems solved by technology

[0003] Suspension bridges have great competitive advantages when crossing wide waters. Multi-tower suspension bridges have great development prospects due to their super spanning ability, but the live load during operation is the most unfavorable state (one span is fully loaded and the other is empty) in the middle bridge tower A huge unbalanced force will be generated, which will cause a great unbalanced force on the main cables on both sides of the cable saddle at the middle tower, and the main cable will easily slip in the cable saddle, seriously threatening the structural safety of the multi-tower suspension bridge

The anti-slip safety between the saddle and the main cable of the multi-tower suspension bridge is one of the basic prerequisites to ensure the stress safety of the multi-tower suspension bridge system. In order to improve the anti-slip safety of the multi-tower suspension bridge, the methods adopted in the prior art include : (1) The "flexible tower" scheme is adopted to reduce the unbalanced force on both sides of the cable saddle by reducing the longitudinal stiffness of the middle bridge tower. There are also structural wind resistance and mid-tower fatigue problems; (2) The vertical pressure of the main cable on the bottom of the saddle is increased by applying weight on the top of the saddle to further increase the friction between the two, but The pressure generated by the extra weight is extremely limited, and has obvious time-varying attenuation, and the improvement effect is not obvious; (3) simply setting multiple vertical friction plates between each row of strands can increase the friction to a certain extent. The friction between the cable strands and the saddle, but the construction cost is relatively high, and the process of welding many vertical friction plates in the small space in the saddle is complicated

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