A system reinforcing method for a steel plate combined continuous beam

A technology of composite beams and steel plates, used in bridge reinforcement, bridges, bridge maintenance, etc., can solve the problems of bridge deck cracking, insufficient bearing capacity of steel plate composite beams, etc., to prevent cracking, eliminate cracking risks, and increase bending resistance and resistance. Effect of Torque Moment of Inertia

Inactive Publication Date: 2019-04-30
ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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Problems solved by technology

[0003] The invention provides a systematic reinforcement method for steel plate composite continuous girders, aiming to solve the problems of insufficient bearing capacity of existing steel plate composite girders and cracking of bridge decks in negative moment areas

Method used

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  • A system reinforcing method for a steel plate combined continuous beam
  • A system reinforcing method for a steel plate combined continuous beam
  • A system reinforcing method for a steel plate combined continuous beam

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Embodiment Construction

[0028] The system strengthening method for steel plate composite continuous beams according to the present invention will be described below with specific examples.

[0029] Such as Figure 1-10 The bridge shown in the figure adopts the form of double main girders of equal height, with 3×40m as a joint. The height of the original main girder is 2.2m. The specific reinforcement steps are as follows:

[0030] The first step is to set up a temporary support near the zero point of the composite beam bending moment, and install a jack 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 temporary support 2 is erected, a jack is installed on it.

[0031] The second step, such as figure 2 As shown, the composite bea...

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Abstract

The invention discloses a system reinforcing method for a steel plate combined continuous beam. The system reinforcing method comprises the steps that a temporary support is erected near a bending moment zero point of the combined beam; secondly, the composite beam is jacked for the first time, a support system on a cover beam of the middle pier is removed, and damaged concrete of a bridge deck ina hogging moment area of the top of the middle pier is chiseled away; then, secondary jacking is conducted, a prefabricated channel beam is hoisted to be installed on the middle pier cover beam, andthe upper flange of the prefabricated channel beam is connected with the lower flange of an H-shaped beam in a welded mode; meanwhile, longitudinal ribs and vertical ribs are implanted into the middlepier cover beam, and studs are welded to the inner side of a steel web of the H-shaped beam; finally, concrete is poured, the temporary support is dismantled, and construction is completed. On one hand, the bearing capacity and torsional distortion resistance of the steel plate combined continuous beam can be greatly improved, on the other hand, the problem of bridge deck slab cracking in the hogging moment area of the steel plate combined continuous beam can be effectively solved, and the purpose of reinforcing an existing steel plate combined continuous beam system is achieved.

Description

technical field [0001] The invention relates to a reinforcement construction method for steel-concrete composite girder bridges, in particular to a systematic reinforcement method for steel plate composite continuous beams. Background technique [0002] Steel plate composite beams are widely used in modern bridge structures due to a series of advantages such as light weight, large spanning capacity, and good economy. With the development of the economy, the traffic volume and vehicle load continue to increase, and the functions of some existing steel plate composite continuous girder bridges continue to degrade, and their carrying capacity can no longer meet the needs of economic growth, and the existing bridges need to be reinforced; , because the bridge deck in the negative bending moment area of ​​the pier top of the steel plate continuous beam composite beam is inevitably in a state of tension, which can easily cause concrete cracking, resulting in corrosion of steel bar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00
CPCE01D22/00
Inventor 马志芳谢小山王为林杜玲霞袁媛闫玉萍陈彦恒随灿孙洪硕卢再光刘阳孙丽娟
Owner ZHENGZHOU RAILWAY VOCATIONAL & TECH COLLEGE
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