The System Transformation Method of Construction of Self-anchored Suspension Bridge with Cables First and Beams Later

Abstract

The invention relates to a system conversion method of first cable later beam construction of a self-anchored suspension bridge. The method includes: building the edge beams and bridge towers of the self-anchored suspension bridge, mounting temporary bridge tower anchoring devices, setting up a main cable to form the main beam sections of a main beam, and determining the position of a final closure; evenly arranging a plurality of bridge tower jacks in each temporary bridge tower anchoring device, and evenly arranged a plurality of closure jacks at the final closure starting the closure jacks and the bridge tower jacks, and controlling the actual total jacking force of the closure jacks and the bridge tower jacks to be equal to the horizontal pull force of the main cable to the edge beams; using a hierarchical symmetrical unloading manner to regulate the gap distance of the closure, and locking the closure jacks and the bridge tower jacks until the gap distance satisfies the welding requirement so as to complete the system conversion of the first cable later beam construction of the self-anchored suspension bridge. The method has the advantages that the temporary bridge tower anchoring devices can be demounted safely, stable conversion of the horizontal force from the temporary bridge tower anchoring devices to the closure gap regulating device can be achieved, and closure gap regulation can be performed smoothly.

Description

【Technical Field】 [0001] The invention belongs to the technical field of suspension bridge construction, and in particular relates to a system conversion method for the construction of a self-anchored suspension bridge with cables before beams. 【Background technique】 [0002] Since the main cable of the self-anchored suspension bridge is anchored to the main girder, the main cable will produce a huge horizontal force during the construction process. Therefore, the traditional construction method is "beam first and cable later", that is, erecting brackets——> The main beam is erected on the support——> Erect the main cable, and anchor both ends of the main cable to the beam end——> Tension sling——> Phase II Paving——> Remove the bracket. Since this method must be erected to install the main beam, it will inevitably interfere with the passage of the channel or road traffic, and the technology is only suitable for erecting the support on the shallow river. The large-span e...

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Problems solved by technology

[0006] However, when the final system is converted and closed, there will be the following problems: after the hoisting of the main girder of the mid-span is completed, the girth welding of the adjacent girder sections can be carried out until only the last girth weld remains, that is, the gap of the closing gap

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