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A large-scale load-lifting and strengthening method for existing steel plate composite continuous girder bridges

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

Inactive Publication Date: 2020-05-05
ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

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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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  • A large-scale load-lifting and strengthening method for existing steel plate composite continuous girder bridges
  • A large-scale load-lifting and strengthening method for existing steel plate composite continuous girder bridges
  • A large-scale load-lifting and strengthening method for existing steel plate composite continuous girder bridges

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Embodiment Construction

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

[0025] like Figure 1-9 The double main girder bridge shown is 3×40m per link, the main girder is of equal cross-section, and the height is 2.2m. After it is strengthened, the pier top beam 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 erected symmetrically near the zero point of the composite beam bending moment, and a jack is installed on the temporary support. Specifically, under the premise of considering the construction needs, such as figure 1 As shown, a temporary support 2 is erected at 12m on the left and right sides of each middle pier 1, and the above four temporary supports 2 are all in the zero moment zone of the composite beam; after the ...

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Abstract

The invention discloses a large-scale load-lifting and strengthening method for existing steel plate combined continuous girder bridges. The damaged concrete of the bridge deck in the negative moment area of ​​the cap and pier top; then carry out the second jacking, hoist the prefabricated channel girder, and weld the upper flange of the prefabricated channel girder to the lower flange of the steel girder, and then construct Pier caps; pouring concrete for the bridge deck in the negative moment area; when the concrete reaches the design strength, unload the jack, remove the temporary supports, and complete the construction. On the one hand, the invention can greatly improve the bearing capacity of the steel plate composite continuous beam, and on the other hand, it can effectively solve the problem of bridge deck concrete cracking in the negative bending moment area of ​​the steel plate composite continuous beam, and achieve the purpose of lifting and strengthening the existing steel plate composite continuous beam.

Description

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

Claims

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Application Information

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Patent Type & Authority Patents(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