Expressway T-beam widening structure and method in operation state

Abstract

The invention discloses an expressway T-beam widening structure and method in an operation state. The problem that in the prior art, it is difficult to guarantee the integrity of new and old bridges through a bridge widening method is solved. The expressway T-shaped beam widening structure in the operating state has the beneficial effects that the transverse connection between an old T-shaped beamand a new T-shaped beam is remarkably improved, and the construction quality is guaranteed. The expressway T-shaped beam widening structure in the operating state comprises the new T-shaped beam arranged on one side of the old T-shaped beam; a first connecting structural part which is connected with an old T-shaped beam flange plate and a new T-shaped beam flange plate; and a second connecting structural part which comprises a plurality of prestress first reinforcing steel bars connected between an old T-shaped beam web and a new T-shaped beam web and second reinforcing steel bar nets arranged between the first reinforcing steel bars, wherein second concrete is poured between third reinforcing steel bar nets formed by the first reinforcing steel bars and the second reinforcing steel bar nets.

Description

Technical field [0001] The invention relates to the field of bridge structure design, in particular to a widening structure and method for expressway T beams under operating conditions. Background technique [0002] In recent years, with the rapid development of my country's economy, the state has made a lot of investment in infrastructure represented by transportation facilities, and has achieved considerable development at the same time. However, the rapid economic development is also accompanied by a surge in population and traffic, which has put forward higher and higher requirements and challenges to my country's existing transportation infrastructure. In this context, in order to meet the increasing demand for traffic and save land resources, the method of rationally using existing roads and improving the capacity of the existing transportation network through the reconstruction and expansion of existing roads has been proposed. schedule. Bridge widening is a crucial link...

AI Technical Summary

Problems solved by technology

[0004] 1) The commonly used methods of widening in current construction are: the superstructure and substructure of the old and new bridges are not connected, the superstructure and substructure of the old and new bridges are connected, and the superstructure of the old and new bridges are connected, and the substructure is not connected; the actual construction usually uses the old and new bridges The method of connecting the upper structure and not connecting the lower structure, since the old and new bridges only connect the upper structure and the lower structure is completely independent, it is difficult to ensure the integrity of the old and new bridges. How to ensure the integrity of the widened structure is a difficult point in the reconstruction and expansion project and focus

[0005] 2) The old bridge is in the normal operating state during construction, and the traffic flow is relatively difficult, which will also greatly increase the hidden danger of safety accidents, which puts forward higher requirements for the work efficiency and safe operation of the construction process

When the anti-collision guardrail is removed, the chiseled concrete fragments are discarded and piled up everywhere, which cannot be reused, and it will cause great damage to the ecological environment; some old flange plates are removed, and artificial wind picks are used to demolish them, which is relatively harmful to the damage to the steel bars in the concrete. Serious, and the interface of the demolition is irregular, which is enough to explain that the traditional artificial pickaxe demolition method consumes a lot of manpower and material resources, and the reuse rate of the guardrail is low

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