A double-width four-cable plane multi-tower cable-stayed bridge

Abstract

The invention proposes a double-width, four-cable plane, and multi-tower cable-stayed bridge with tree stump flowerpot-shaped brackets with ring-row supports, which has the advantages of good structural rigidity, beautiful shape, convenient construction, and reasonable economy. On the bridge foundation, a stump flowerpot-shaped bracket with a single-leaf hyperboloid thin shell is set, and ring-row supports are set on the top of the tree-stump flowerpot-shaped bracket to support the double-width main girder bridge deck. The ring-row support system can restrain the main beam and cables. The relative rotation between the towers improves the structural rigidity of the multi-tower cable-stayed bridge. Uniformly arrange unbonded prestressed steel strands in the variable-section concrete-filled steel tube hollow column bridge pylons, stretch the prestressed steel bars to squeeze the concrete, improve the compactness of the concrete in the tube, and solve the interface between the large-diameter steel tube and the core concrete column Separating the problem and improving the structural stiffness of the pylon columns of variable-section concrete-filled steel tube bridges. Paste simulated bark around the pylons of variable-section prestressed concrete-filled steel tube bridges, and set artificial leaf crowns on top of the pylons of variable-section prestressed steel tube concrete bridges to enhance the landscape effect.

Description

technical field [0001] The invention belongs to the field of civil engineering, and relates to a cable-stayed bridge structure, in particular to a double-width, four-cable plane, and multi-tower cable-stayed bridge with ring-row supports, tree stumps and flowerpot-shaped brackets. Background technique [0002] The double-width four-cable plane multi-tower cable-stayed bridge is a cable-stayed bridge with three or more single-column towers. With the advantages of small area and reasonable economic indicators, the double-width four-cable plane multi-tower cable-stayed bridge is well received by the bridge engineering community. [0003] In view of the mechanical characteristics of the double-width four-cable plane multi-tower cable-stayed bridge, the two sides of the middle tower of the double-width four-cable plane multi-tower cable-stayed bridge have neither auxiliary piers and transition piers nor end anchor cables, and there is no support for the main girder and cable towe...

AI Technical Summary

Problems solved by technology

[0005] Adopting the scheme of increasing the geometric dimensions of the cable tower structure and the main beam structure, that is, using a large-scale cable tower structure to increase the stiffness of the bridge tower and the main beam structure, will increase the cost of the bridge, which is very uneconomical; adopting the tower beam consolidation scheme will lead to temperature effects The increase of the force on the bridge tower under the action will increase the scale of the cable tower and the foundation; the use of side spans to set auxiliary piers and transition piers has some effect on three-tower cable-stayed bridges, and for multi-tower cable-stayed bridges with more than four spans, the other It cannot improve the force bearing of the intermediate bridge towers, nor can it reduce the problem of excessive live load displacement of the main girder of the intermediate span; adopting the scheme of setting auxiliary cables, and setting auxiliary cables between the cable towers is an effective method to improve the stiffness and stability of multi-tower cable-stayed bridges , however, affects the aesthetics of the bridge

[0006] The Jiashao Bridge is a Strait Bridge across the Hangzhou Bay. It adopts a double-width, four-cable plane, and six-tower cable-stayed bridge structure system. The Jiashao Bridge proposes that the cable towers be equipped with cantilevered X-shaped brackets, and the main girder is equipped with longitudinal double-row supports. The relative rotation degrees of freedom between the main girder and the cable tower are constrained to improve the stress of the multi-tower cable-stayed bridge. The beam consolidation system is basically the same, which can solve the problem of the vertical stiffness of the main girder of the multi-tower cable-stayed bridge with weak tower structure. However, the force of the cantilever X-shaped bracket is very complicated. The construction of the standard cantilever X-shaped bracket is very difficult, and the construction of the negative moment steel bar of the cantilever X-shaped bracket anchored to the tower column is very difficult

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