A multi-block main cable saddle structure

Abstract

The invention relates to a multi-block main cable saddle structure. The main cable saddle of a suspension bridge is divided into an upper saddle head and a lower saddle head through partitioning interfaces. The partitioning interfaces are located in the position 30+ / -5cm below a cable bearing trough bottom plate for a main cable. Concave-convex seams are adopted at the partitioning interfaces. End transverse ribs at the partitioning interfaces are connected through splice plates and high-strength bolts at the concave-convex seams. The upper saddle head and the lower saddle head are each equally divided into three blocks through the transverse partitioning interfaces in the longitudinal direction. The two end transverse ribs are arranged on the two sides of each transverse partitioning interface respectively and connected through the high-strength bolts. By means of the multi-block main cable saddle structure, the partitioned blocks can be quickly mounted on site; residual welding stress caused by super-thick plate welding is avoided through the partitioned blocks in the height direction, the upper saddle head and the lower saddle head are tightly connected together under the action of the powerful vertical main cable pressure; the concave-convex seams facilitate high-altitude hoisting and splicing and can also resist unbalanced horizontal shear force; by adopting the partitioned blocks, the weight of a single saddle body is reduced, casting, transporting and hoisting are facilitated, and the multi-block main cable saddle structure is particularly applicable to large-span suspension bridges in mountainous areas where transportation condition limitations exist.

Description

technical field [0001] The invention relates to a multi-block main cable saddle structure. Background technique [0002] With the needs of my country's economic and social development, it is necessary to build long-span bridges in order to cross large rivers, deep valleys and straits, and connect to natural moats. The main cable saddle of a suspension bridge is an integral force-bearing component, which transmits the weight load of the whole bridge. The main cable saddle of a long-span kilometer-class suspension bridge is often larger in size and weight. Due to structural control, it is not easy to cast all the main saddles of long-span suspension bridges with cast steel. In engineering applications, the upper saddle is generally cast with cast steel, and the saddle body is generally made of Q345R thick steel plate, and the two are connected by welding. Since the thickness of the saddle body ribs of the main cable saddle can often reach 10-18cm, the interface between the sa...

AI Technical Summary

Problems solved by technology

Since the thickness of the saddle body ribs of the main cable saddle can often reach 10-18cm, the interface between the saddle head cast steel and the saddle body steel plate will produce a large welding residual stress, and there may be some sand inclusions in the saddle head thick plate during the casting process , air holes and other defects, the unfavorable combination of the two will have an adverse effect on the saddle body force; it will greatly reduce the safety performance of the saddle

[0003] For the main saddle of large tonnage, the main cable saddle is generally divided into three pieces along the longitudinal direction in the engineering design. Due to the limitation of the structure, the number of longitudinal divisions is limited, and there is no good division method in the height direction, so that the long-span suspension bridge is single The hoisting weight of the block cable saddle can reach more than 120t, which makes it difficult to hoist and transport the saddle at high altitude

For bridges in mountainous areas, large-tonnage saddles are more difficult to transport, which restricts the design and construction of saddles

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