Constructing method of main tower of cable-stayed bridge through circumferential prestressing force

Abstract

The invention discloses a constructing method of a main tower of a cable-stayed bridge through circumferential prestressing force. The constructing method comprises the following steps of mounting a stiff framework; mounting and positioning anchor backing plates; mounting collapsing resistance reinforcing bars and corrugated pipes; blanking steel strand wires, and guiding bunches of steel strand wires into pores; performing formwork construction and concrete construction; performing prestressing force tensioning; performing pore grouting; and performing cutting and anchor sealing. According to the constructing method disclosed by the invention, the constructing efficiency and the mounting accuracy are effectively improved, the cutting of structural main reinforcing bars can be reduced, the anticorrosion capacity can be effectively improved, the structural dimension and the using safety of the structure are also guaranteed, little equipment is used during construction, and the working procedure is simple.

Description

technical field [0001] The invention relates to a ring-direction prestressed construction method of the main tower of a cable-stayed bridge. Background technique [0002] In long-span cable-stayed bridges, most of the tower columns in the anchorage area of ​​the cable tower adopt the cross-section form of prestressed concrete box section to give full play to the material properties of concrete, and to balance the strong tension of the cable by applying horizontal prestress. The horizontal beam used in the past was a well-shaped straight beam, but the beam length was shorter due to the smaller size of the tower column, and the loss of prestress caused by the retraction of the steel beam and the deformation of the anchorage was relatively large, so the amount of prestressed tendons was large. In particular, the arrangement of cable conduits in this area is relatively dense, and there are many structural reinforcements (especially in the anchorage area of ​​cable-stayed cables)...

AI Technical Summary

Problems solved by technology

The horizontal beam used in the past was a well-shaped straight beam, but the beam length was shorter due to the smaller size of the tower column, and the loss of prestress caused by the retraction of the steel beam and the deformation of the anchorage was relatively large, so the amount of prestressed tendons was large. Especially in this area, the arrangement of cables and conduits is relatively dense, and there are many structural reinforcements (especially in the anchorage area of ​​cable-stayed cables). The increase in the amount of prestressed beams will make the structure of the tower column more complicated and the construction difficulty will increase.

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