Self-supporting cast-in-place construction method for concrete beam of cable-stayed bridge

Abstract

The invention discloses a self-supporting cast-in-place construction method for a concrete beam of a cable-stayed bridge, and relates to the technical field of bridge construction. The method comprises the following steps: step 1, horizontally dividing a cross beam to be constructed into a lower beam layer and an upper beam layer; step 2, constructing a beam support; step 3, pouring the lower beam layer, and when the concrete strength of the lower beam layer reaches 100% of the self-strength, tensioning and grouting part of prestressing tendons, so that the lower beam layer forms a stable structure; and step 4, pouring the upper beam layer, and tensioning and grouting residual prestressing tendons so as to finish beam construction. The beam is divided into an upper layer and a lower layer for construction, the lower-layer beam is firstly tensioned and grouted to form part of the prestressing tendons, self-weighing in the beam construction process is achieved, the bearing requirement of the beam support is lowered, and the design of the beam support is optimized.

Description

technical field [0001] The invention relates to the technical field of bridge construction, in particular to a concrete beam self-supporting cast-in-place construction method for a cable-stayed bridge. Background technique [0002] With the development of my country's traffic construction, bridges are being built one after another, in which the tower columns 100 are getting higher and higher, the spans are getting bigger and bigger, and the prestressed beams are more and more widely used. In the construction of prestressed beams, due to the weight of the beams and the long distance between the tower columns 100, it is not suitable to use the method of constructing corbels + load-bearing beams on the tower columns 100, and the beams are relatively high from the ground, so usually when constructing beams, it is necessary Construction The beam support that transmits the self-weight of the beam and the construction load to the ground. The beam supports in the prior art usually ...

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Problems solved by technology

[0003] The purpose of this application is to overcome the problems in the prior art that the prestressed beams are self-heavy and high in position, resulting in complex beam support structures and difficult construction, and to provide a self-supporting cast-in-place construction method for concrete beams of cable-stayed bridges. For the construction of the upper and lower floors, the lower beams are pre-tensioned and grouted to form a part of the prestressed beams to realize self-support during the beam construction process, reduce the load-bearing requirements of the beam brackets, and optimize the design of the beam brackets

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