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System and method for detecting compactness of prestressed pore channel of prestressed concrete structure

A concrete structure and compactness detection technology, applied in the field of prestress detection, can solve the problems of stagnant prestressed tunnel grouting compactness detection technology, uncompact grouting of prestressed tunnels, and failure to eradicate defects, etc. Ease of promotion, extended service life, high accuracy

Inactive Publication Date: 2016-07-20
SHANXI PROVINCIAL RES INST OF COMM +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, some of these methods are difficult to operate, some have poor accuracy, some have damage to the beam body or have low efficiency, and have not been widely promoted and applied.
As a result, the detection technology of prestressed channel grouting density in prestressed concrete structures has been stagnant, and the defects of prestressed channel grouting that are not dense can not be eradicated, and there are still great safety hazards in prestressed concrete bridges

Method used

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  • System and method for detecting compactness of prestressed pore channel of prestressed concrete structure

Examples

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Effect test

Embodiment 1

[0020] A 3×20m prestressed concrete simply supported small box girder bridge on an expressway, the small box girder is designed with 6 beams Before pouring concrete, two steel strands need to be pre-embedded on the bottom plate and web plate of the small box girder and 4 sticks For the corrugated pipe, 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 ordinary grouting equipment to fill the gap of the corrugated pipe, and the steel strand passes through the cement slurry and the concrete beam. connected to form a whole.

[0021] The detection system adopted includes a low-voltage high-current steel bar heating device 1, a connecting wire 2 and an infrared thermal imager 3; the low-voltage high-current steel bar heating device 1 adopts an adjustable low-voltage high-current transformer, and adopts 20k-100kVA The power, the voltage is 5-36V, the current can...

Embodiment 2

[0024] A 3×20m prestressed concrete simply supported small box girder bridge on an expressway, the small box girder is designed with 6 beams Before pouring concrete, two steel strands need to be pre-embedded on the bottom plate and web plate of the small box girder and 4 sticks For the corrugated pipe, 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 ordinary grouting equipment to fill the gap of the corrugated pipe, and the steel strand passes through the cement slurry and the concrete beam. connected to form a whole.

[0025] The detection system adopted includes a low-voltage high-current steel bar heating device 1, a connecting wire 2 and an infrared thermal imager 3; the low-voltage high-current steel bar heating device 1 adopts an adjustable low-voltage high-current transformer, and adopts 20k-100kVA The power, the voltage is 5-36V, the current can...

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Abstract

The invention belongs to the technical field of prestress detection and particularly relates to a system and method for detecting compactness of a prestressed pore channel of a prestressed concrete structure.The detection system comprises low-voltage strong-current steel-bar heating equipment, a connecting wire and an infrared ray thermal imager; one end of the connecting wire is connected with the low-voltage strong-current steel-bar heating equipment, and a clamp made of red copper is arranged at the other end of the connecting wire and can be connected with a steel strand in a closely-attached mode.Compared with the prior art, the prestressed concrete structure corrugated pipe grounting compactness detection system is easy to operate, high in speed, great in applicability, high in accuracy and easy to popularize, great promotion effects are achieved for conducting construction quality control of the prestressed concrete structure, guaranteeing operation safety of a prestressed bridge or structure and prolong the service life of the prestressed bridge or structure, the system plays a great role in the technical field of prestress detection of the prestressed concrete structure, and market prospect is wide.

Description

technical field [0001] The invention belongs to the technical field of prestress detection, and in particular relates to a system and method for detecting the compactness of a prestressed tunnel in a prestressed concrete structure. Background technique [0002] At present, the most commonly used prestressing technology in highway bridges is post-tensioning prestressing, and most of them are bonded prestressed concrete structures. However, in prestressed concrete bridges, the prestressed steel strands are mostly arranged in bundles, and large-diameter corrugated pipes need to be pre-embedded, which weakens the cross section of the structure. Therefore, after the prestressed steel strands are stretched, It is necessary to inject high-strength cement slurry into the bellows to fill the remaining space of the beam body section. Its function mainly has three points: 1. Recover the cross-sectional area of ​​the prestressed beam, avoiding the concrete of the beam body from being c...

Claims

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Application Information

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IPC IPC(8): G01N25/20G01N25/72
CPCG01N25/20G01N25/72
Inventor 刘志华韩之江郭学兵申雁鹏吕立宁郭文龙毛敏卢鹏谢立安王磊赵文溥
Owner SHANXI PROVINCIAL RES INST OF COMM
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