Temperature self-adaptive tower beam bridge direction constant-temperature steel pull rod constraint method and system

Abstract

The invention relates to the field of constraint systems of long-span bridge structures, and discloses a temperature self-adaptive tower beam bridge direction constant-temperature steel pull rod constraint method in one aspect, which comprises the following steps: determining a section area A of a steel pull rod according to stress analysis of a bridge structure; setting two sets of steel pull rods on each of two sides of a main beam between two main towers, wherein an outer wrapping sleeve is arranged outside each steel pull rod and a gap is reserved between the two, one end of each set of steel pull rod is connected with a lower cross beam of the corresponding main tower, and the other end of each set of steel pull rod is connected with the center point of a lower chord of the corresponding main beam; laying a temperature control system that is communicated with the gap between the outer wrapping sleeve and the steel pull rod. The invention further discloses a temperature self-adaptive tower beam bridge direction constant-temperature steel pull rod constraint system in another aspect. According to the method and system, the stress condition of the main tower, when the main beam is under the action of temperature and wind load and the action of a live load, can be effectively improved at the same time, and meanwhile, the beam end longitudinal displacement of the main beam is reduced.

Description

technical field [0001] The invention relates to the field of restraint systems for long-span bridge structures, in particular to a restraint method and system for temperature-adaptive tower girders along the direction of the bridge with constant-temperature steel tie rods. Background technique [0002] The continuous improvement of people's living standards has put forward higher requirements for traffic travel. Bridge structures account for a high proportion of my country's main high-speed rail lines. Driving safety and comfort have put forward higher requirements for bridge structures. In addition, new structures and new materials continue to advance, and bridge site resources are becoming more and more precious. The use of long-span road-rail joint construction can improve the utilization efficiency of bridge site resources. Long-span bridges have large spans and heavy loads. Under the action of wind load, temperature load and live load, the main girder will produce a la...

AI Technical Summary

Problems solved by technology

However, this scheme constrains the deformation of the main beam under temperature load, increases the control bending moment of the main tower, and increases the cost of the main tower

And the elastic steel tie rod is generally longer, the tension is lower, the sag effect is obvious, and the stiffness of the elastic cable is significantly lost

[0006] None of the existing restraint schemes can simultaneously improve the stress of the main girder under the action of temperature and wind load, and the main tower under the action of live load, and cannot simultaneously reduce the displacement of the girder end of the main girder along the bridge direction

Images