Large-amplitude load increasing and reinforcing method for existing steel plate combined continuous beam bridge

A large-scale, composite beam technology, used in bridge reinforcement, bridge, bridge maintenance, etc., can solve the problems of insufficient bearing capacity of beam bridges, easy cracking of bridge decks, etc., and achieve the effect of improving bearing capacity, preventing cracking, and improving section stiffness.

Inactive Publication Date: 2019-03-22
ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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  • Abstract
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Problems solved by technology

[0003] The invention provides a large-scale load-lifting and strengthening method for the existing steel plate combined continuous girder bridge.

Method used

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  • Large-amplitude load increasing and reinforcing method for existing steel plate combined continuous beam bridge
  • Large-amplitude load increasing and reinforcing method for existing steel plate combined continuous beam bridge
  • Large-amplitude load increasing and reinforcing method for existing steel plate combined continuous beam bridge

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Embodiment Construction

[0024] In the following, specific embodiments are used to illustrate the large-scale load-lifting and strengthening method for an existing steel plate composite continuous beam bridge according to the present invention.

[0025] Such as Figure 1-9 The double main girder bridge shown is 3×40m each, the main girder is of equal section and the height is 2.2m. After strengthening it, the pier top girder is 2.8m high. The specific reinforcement steps are as follows:,

[0026] Including the following steps:

[0027] In the first step, a temporary support is symmetrically set up near the zero point of the bending moment of the composite beam, and a jack is installed on the temporary support. Specifically, under the premise of considering construction needs, such as figure 1 As shown, a temporary support 2 is set up at 12m on the left and right sides of each middle pier 1. The above four temporary supports 2 are all in the zero-point zone of the composite beam; after the temporary support...

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Abstract

The invention discloses a large-amplitude load increasing and reinforcing method for an existing steel plate combined continuous beam bridge. The method comprises the steps of putting up a temporary support nearby a combined beam bending moment zero point; then conducting first-time jacking on a combined beam, and chiseling damaged concrete on a middle bridge pier cap and a pier top hogging momentregion bridge deck slab; then conducting second-time jacking, hoisting a prefabricated trough beam, welding an upper flange of the prefabricated trough beam to a lower flange of a steel girder, and then constructing the bridge pier cap; casting concrete to the hogging moment region bridge deck slab; after the concrete reaches the designed intensity, unloading a jack, and dismantling the temporarysupport to complete construction. By means of the method, on one hand, the bearing capacity of the steel plate combined continuous beam can be greatly improved; on the other hand, the problem that the concrete of the hogging moment region bridge deck slab of the steel plate combined continuous beam cracks can be effectively solved, and the purpose of conducting load increasing and reinforcing onthe existing steel plate combined continuous beam is achieved.

Description

Technical field [0001] The invention relates to a reinforcement construction method of a steel-concrete composite beam bridge, in particular to a large-scale load-lifting reinforcement method for an existing steel plate composite continuous beam bridge. Background technique [0002] Steel composite continuous girder bridges are widely used in modern bridge structures due to their light weight, large span (span range up to 30-130m), economy and durability, etc. However, because the bridge deck in the negative moment area on the top of the pier is inevitably in tension, it is very easy to cause concrete cracking, which in turn affects its performance and service life. On the other hand, as the load and flow of vehicles on the bridge increase, the functions of some existing steel-steel composite continuous beam bridges continue to degrade, and their carrying capacity cannot meet the needs of economic growth. Load reinforcement. Summary of the invention [0003] The invention provid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00
CPCE01D22/00
Inventor 谢小山马志芳王为林陈彦恒王大帅齐悦冯申申卞家胜潘鹏飞杨光邸银桥
Owner ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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