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Grouting-free adhesive-bonded prestressed steel bar and preparation and construction method thereof

A technology of prestressed steel bars and construction methods, applied to structural elements, building components, building reinforcements, etc., can solve the problems of weakening the cooperating ability of prestressed bars and concrete, plugging pipes, and reducing the mechanical properties of prestressed bars, etc., to achieve Easy on-site use and quality control, good quality controllability, and broad market prospects

Inactive Publication Date: 2015-08-19
SHANXI PROVINCIAL RES INST OF COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, most of the prestressed steel bars can only be arranged in multiple bundles, and large-diameter corrugated pipes need to be pre-embedded, which weakens the cross section of the structure, and it is easy to cause grout leakage and blockage of the corrugated pipes during the concrete pouring process, resulting in prestressed steel bars. Rebar cannot be placed
At the same time, after the stretching of the prestressed tendons is completed, the prestressed pipes must be grouted. In actual operation, it is inevitable that the grouting will not be full, resulting in the following diseases: (1) Corrosion of the prestressed tendons, cracking of the prestressed tendons The mechanical properties are reduced; (2) weakening the cooperating ability of prestressed tendons and concrete, etc.; (3) the section of the component is weakened due to the grouting of the bellows is not full; (4) the cement slurry in the bellows seeps due to frost heave It is the cracking of concrete components along the bellows and many other diseases, which cause greater safety hazards to prestressed components

Method used

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  • Grouting-free adhesive-bonded prestressed steel bar and preparation and construction method thereof
  • Grouting-free adhesive-bonded prestressed steel bar and preparation and construction method thereof
  • Grouting-free adhesive-bonded prestressed steel bar and preparation and construction method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] A 3×20m prestressed concrete simply supported small box girder bridge on a highway. The original design of the small box girder used 6 bundles of φ15.2 steel strands. 2 pieces of φ50 and 4 pieces of φ55 bellows, the wall thickness of the bellows is 1mm. After the concrete pouring is completed and the prestressed steel bars are stretched, a certain proportion of cement slurry is injected into the bellows through special grouting equipment. Fill the gap of the corrugated pipe, and make the steel strand pass through the cement slurry and the concrete beam as a whole. Design see image 3 .

[0019] The preparation method of the glue-bonded prestressed steel bar without grouting according to the present invention, the preparation method is specifically: after filling the corrugated pipe with Huitian brand 6011 (HT606W) single-component heating and curing structure bonding epoxy glue , insert the prestressed steel bar into the bellows, so that the prestressed steel bar can ...

Embodiment 2

[0022] A 90+150+90m prestressed concrete low-tower cable-stayed bridge on a certain grade of road. The original design of the vertical prestressing of the concrete main girder uses φ32 fine-rolled rebar. Before pouring concrete, it needs to be pre-embedded φ50 plastic corrugated pipe, the wall thickness of the corrugated pipe is 1mm. After the concrete pouring is completed and the prestressed steel bars are stretched, a certain proportion of cement slurry is injected into the corrugated pipe through special grouting equipment to fill the gap of the corrugated pipe. , and make the steel strand pass through the cement slurry and the concrete beam as a whole.

[0023] The preparation method of the grouting-free glue-bonded prestressed steel bar according to the present invention, the preparation method is specifically: filling the Huitian brand 6011 (HT606W) single-component heat-cured structural adhesive ring in the φ36 steel bellows After the oxygen glue, insert the prestressed...

Embodiment 3

[0026] A 90+150+90m prestressed concrete low-tower cable-stayed bridge on a certain grade of road. The original design of the vertical prestressing of the concrete main girder uses φ32 fine-rolled rebar. Before pouring concrete, it needs to be pre-embedded φ50 steel bellows, the wall thickness of the bellows is 1mm. After the concrete pouring is completed and the prestressed steel bars are stretched, a certain proportion of cement slurry is injected into the bellows through special grouting equipment to fill the bellows. gaps, and make the steel strand pass through the cement slurry and the concrete beam as a whole.

[0027]The preparation method of the grouting-free glue-bonded prestressed steel bar according to the present invention, the preparation method is specifically: filling the Huitian brand 6011 (HT606W) single-component heat-cured structural adhesive ring in the φ36 steel bellows After the oxygen glue, the glue also added 1% of the total mass of Russula ketoterpene ...

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Abstract

The invention belongs to the technical field of prestress, and particularly relates to a grouting-free adhesive-bonded prestressed steel bar and a preparation and construction method thereof. The adhesive-bonded prestressed steel bar comprises a corrugated pipe, structural adhesive and a prestressed steel bar. The preparation method comprises the following steps: after filling the corrugated pipe with structural adhesive, inserting the prestressed steel bar in the corrugated pipe; erasing the superfluous structural adhesive so as to enable the prestressed steel bar to be capable of freely expanding and contracting in the corrugated pipe. Compared with the prior art, the grouting-free adhesive-bonded prestressed steel bar disclosed by the invention has the advantages that concentrated factory production can be adopted, the quality controllability is good, the separability of types is high, and the on-site usage and the quality control are convenient. Experiments prove that the grouting-free adhesive-bonded prestressed steel bar is high in bonding strength with concrete members, is good in compactness and is high in capability of resisting corrosion, so that the overall working properties and the durability of a prestressed concrete structure are greatly improved, and the service life of the prestressed concrete structure is prolonged. The grouting-free adhesive-bonded prestressed steel bar disclosed by the invention can play an important role on the technical field of the prestress, and has an extensive market prospect.

Description

technical field [0001] The invention belongs to the technical field of prestressing, and in particular relates to a grouting-free glue-bonded prestressing steel bar and a preparation and construction method thereof. Background technique [0002] Prestressing is to improve the working performance of structures or components under service conditions and to use the permanent internal stress pre-applied before use. The prestressed concrete structure was born in the practice of applying the principle of prestressing to concrete. Compared with ordinary reinforced concrete structures, prestressed concrete structures have the following main characteristics: (1) save engineering materials; (2) reduce the self-weight of structures; (3) improve and enhance the mechanical properties of structures or components, and can delay cracking, improve the crack resistance and stiffness of components, and reduce deformation; (4) improve the durability, fatigue resistance and earthquake resistance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E04C5/08E04C5/02E04C5/03E04C5/10
Inventor 刘志华韩之江吕立宁杜树军郭学兵申雁鹏舒兴旺郭文龙赵文溥贾磊毛敏王磊谢立安卢鹏
Owner SHANXI PROVINCIAL RES INST OF COMM
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