Single-tower cable-stayed bridge construction method

Abstract

The invention discloses a single-tower cable-stayed bridge construction method based on a creeping formwork. The constructed single-tower cable-stayed bridge comprises a main tower, a bridge lower portion supporting structure and a girder. The bridge lower portion supporting structure comprises a midspan buttress and two beam end buttresses. A splicing bed jig for splicing pushing steel box beamsis arranged right behind each beam end buttress; during construction of the single-tower cable-stayed bridge, the method comprises the steps that 1 constructing the bridge lower portion supporting structure, a temporary buttress and the midspan temporary buttress, 2 pushing a beam body, 3 performing midspan folding, 4 installing a stay cable. A walking type three-dimensional hydraulic pushing device is adopted for synchronously pushing two beam bodies of the cable-stayed bridge girder from the two sides of the midspan till folding is performed; pushing control over the walking type three-dimensional hydraulic pushing device is easy and convenient, synchronous motions of multiple sets of walking type three-dimensional hydraulic pushing devices can be easily and conveniently achieved, pushing position arrangement is flexible, no guiding beam or a sliding way beam for longitudinal pushing is needed, self-balance pushing is truly achieved, and the pushing process is safe and reliable.

Description

technical field [0001] The invention belongs to the technical field of cable-stayed bridge construction, and in particular relates to a construction method of a single-tower cable-stayed bridge. Background technique [0002] With the continuous improvement of my country's bridge design and construction technology, a large number of continuous steel box girder bridges have emerged in the fields of highways, urban transportation, and railways. The jacking method is widely used in its construction due to the advantages of less land occupation, no impact on the traffic under the bridge, no need for large lifting equipment, safety and reliability, and low cost. The jacking method construction is to set up a prefabricated field behind the abutment along the bridge axis direction, and set up steel guide beams, temporary piers, slideways, horizontal jacks (also called jacking force devices or jacking force devices), etc., the actual During construction, after the beam body is proce...

AI Technical Summary

Problems solved by technology

However, the multi-point jacking method and the corresponding jacking system currently used have the following defects and deficiencies to varying degrees: First, the synchronization accuracy of the existing jacking equipment is not enough, and there are inevitably multiple jacking machines in the jacking process The action error of the equipment; second, the existing jacking construction method and jacking system are difficult to control the closing accuracy of the jacking under large slopes and linear complex situations; third, without fully automatic digital control, it is difficult to grasp the accuracy of the force value ; Fourth, more operators are required, labor input is large, labor-intensive and time-consuming, and construction efficiency is low; Fifth, part of the multi-point push construction also needs to use guide beams for traction, the construction investment is large, and the construction process is complicated

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