Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab

A technology of transverse tensioning and epoxy coating, which is applied in the field of reinforcement of buildings and other building structures, reinforced concrete and prestressed concrete bridges, and can solve the problems of high reinforcement cost, inconvenient reinforcement construction, and material utilization efficiency. Low-level problems, to achieve the effect of simplifying the tensioning procedure, facilitating the layout of prestressed steel bars, and improving the tensioning efficiency

Inactive Publication Date: 2010-12-29
HARBIN INST OF TECH
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  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to adopt a new type of epoxy-coated steel bar with anti-corrosion protection in transverse tension and bonded prestressing reinforcement technology to replace high-strength steel strands or ordinary hot-rolled steel bars in longitudinal tension; Inexpensive composite mortar or concrete, instead of expensive high-performance tensile composite mortar or aggregated mortar structure treatment and construction technology, to solve the problems of low material utilization efficiency, high reinforcement cost, and inconvenient reinforcement construction

Method used

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  • Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab
  • Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab
  • Method for reinforcing bonded prestressing force of transversely tensioning epoxy coating reinforcing steel bar of concrete beam slab

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Experimental program
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Effect test

Embodiment 1

[0028] The process of strengthening the flexural bearing capacity of the positive section of the simply supported concrete hollow slab beam is as follows: (see figure 1 )

[0029] 1) According to the bridge inspection and bearing capacity evaluation report, determine the reinforcement area of ​​the beam body 5 .

[0030] 2) Calculate the corresponding cross-sectional area of ​​prestressed steel bar according to "Code for Design of Highway Bridge Strengthening" JTG / TJ22-2008.

[0031] 3) Select the epoxy-coated steel bar 3 of appropriate diameter as the spare prestressed steel bar material.

[0032] 4) Making the steel strip 1 anchored by the prestressed steel bar, the thickness of the steel strip is not less than 10mm, and the length is equal to the width of the area where the prestressed reinforcement beam body 5 is arranged.

[0033] 5) Install the prepared anchor steel strips 1 at both ends of the designed position of the reinforcement area. The steel strip 1 is bonded t...

Embodiment 2

[0038] Diagonal section strength for strengthening T-beam and box girder bridges ( figure 2 , image 3 shown)

[0039] For the shear reinforcement of the oblique section of T-beam and box girder bridge 5, the construction steps and methods are similar to those in Embodiment 1. The difference is that in the construction step 8), the method of reinforcing the prestressed steel bars 3 is arranged on both sides of the web (or in the box), and the composite mortar (or concrete) 4 protective layer can be constructed by the plastering method.

Embodiment 3

[0041] Multi-span simply supported slab and girder bridges from simply supported to continuous reinforcement

[0042] Multi-span simply supported slab and girder bridge 5 are reinforced by simply supported to continuous method, and the construction steps and methods are similar to those in Embodiment 1. The difference is that in the construction step 8), the method of reinforcing the prestressed steel bars is to arrange the reinforced prestressed bars 3 on the pier tops of the adjacent spans in the middle, and directly pour cement-based crystalline molded steel bars on them after the steel bars are stretched. Concrete 4 pavement layer of waterproof material to enhance the crack resistance of the bridge deck.

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Abstract

The invention relates to a method for reinforcing a bonded prestressing force of a transversely tensioning epoxy coating reinforcing steel bar of a concrete beam slab, which relates to the reinforcement of reinforced concrete and prestressed concrete bridges and is suitable for the reinforcement of house buildings and other building structures. In a prestressing force reinforcing technique of the invention, a novel transversely tensioning corrosion-resistant epoxy coating reinforcing steel bar is used for substituting for a longitudinally tensioning high-strength steel strand or common hot-rolled reinforcing steel bar and a transversely clamping device is used for substituting transverse tensioning for longitudinal tensioning, so that low-cost composite mortar or concrete can be used for substituting for high-cost high-performance tensile composite mortar or polymer mortar to perform a structure treatment and construction process, and the problems of low utilization efficiency of materials, high reinforcing cost and inconvenient reinforcing construction are solved.

Description

technical field [0001] The invention belongs to the technical field of building reinforcement, in particular to the reinforcement of reinforced concrete and prestressed concrete bridges, and is also applicable to the reinforcement of building construction and other building structures. Background technique [0002] After the bridge structure is completed, in the long-term operation process, due to the effect of the environment, overload and the continuous deterioration of the performance of the building materials themselves, various damages have occurred to the bridge structure, and the bearing capacity of the bridge has continued to decline. When the bearing capacity drops to a certain extent, it will not meet the requirements of use, and the bridge structure must be reinforced to restore its use function. [0003] In the strengthening technology of concrete bridge structures in active service, bonded prestressed reinforcement is one of the technical means of bridge strengt...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D22/00E04G23/02E04G21/12
Inventor 张树仁张连振李忠龙孙永明
Owner HARBIN INST OF TECH
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