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Pier body cap cracking body outside stress reinforcing method

A technology of external prestressing and pier body caps, which is applied in bridge reinforcement, bridge erection/assembly, bridge maintenance, etc., to achieve the effect of good use, overcome influence, and facilitate construction

Active Publication Date: 2009-07-15
THE FOURTH ENG CO LTD OF CHINA ZHONGTIEMAJOR BRIDGE ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, there is not yet a safe, high-quality and efficient construction method

Method used

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Embodiment

[0021] Vertical cracks appeared in the main pier of the continuous girder spanning the embankment of the approach bridge of the Huaihe Highway Bridge on Chaoyang Road, Bengbu City, Anhui Province, and some of the pier tops of the 40-meter continuous girder solid pier were reinforced by external prestressing, that is, stiff skeleton plus prestressed steel beams wrapped in concrete. It does not affect the overall appearance of the bridge, effectively guarantees the strength of the pier body, and the construction is simple, convenient, fast and safe.

[0022] The rigid skeleton beam is processed in the factory. In order to ensure the processing accuracy and control the deformation, the automatic cutting machine is used to cut the material, and the carbon dioxide gas shielded automatic welding is used.

[0023] Since a total of 34 pier caps on both sides of the north and south banks need to be reinforced, the height of the pier ranges from 4.5m to 21m, and the average pier height i...

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Abstract

The present invention is an external prestressed strengthening method for pier body cap cracking, and its construction steps include: erecting steel pipe construction supports beside the pier, and establishing a reinforcement construction operation platform; using a 35t automobile crane to hoist and transport the rigid framework to the side of the installation pier; Chiseling the notch around the pier cap in the installation range of the stiffening frame; coating epoxy resin cement along the supporting plate of the stiffening frame; Tensile force; pouring epoxy resin concrete in the notch; grouting treatment for the space between the stiff skeleton box and the stiff skeleton and the pier cap; using the support platform and lifting shoulder beam to assemble the overall steel formwork and formwork support; pouring C30 fine stone outsourcing Concrete; Formwork removal; Exterior repairs. The invention has the advantages of effectively solving the reinforcement method of the vertical cracks in the pier cap caused by the lack of transverse reinforcement at the top of the pier. It has the advantages of safety, economy, speed and convenience for construction.

Description

technical field [0001] The invention relates to an external prestressed reinforcement method for cracked pier caps and construction equipment thereof, and belongs to the technical field of bridge pier cap reinforcement. Background technique [0002] Due to the lack of horizontal steel bars in the design of the bridge pier cap, vertical cracks have occurred in the pier cap. In order to make the completed pier cap reach its design bearing capacity, a rigid skeleton is added to the top layer of the pier cap to add transverse prestress. The method of steel strands to reinforce the treatment. The reinforcement construction is a high-altitude operation, and it is difficult to install the rigid frame, lifting pole beam, formwork, etc. in place at one time with a crane. There are many manual operations, which are difficult and dangerous. The welding workload is large, and the processing is time-consuming. These directly affect the safety of construction, the quality of constructio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D22/00
Inventor 查道宏周东鄢乃军刘俊韦理仁徐炳法龙皓王延长
Owner THE FOURTH ENG CO LTD OF CHINA ZHONGTIEMAJOR BRIDGE ENG GRP
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