Prestressed steel structure front-pulling and rear-locking cast-in-place platform construction method

A technology of prestressed steel and construction methods, which is applied in the direction of erecting/assembling bridges, bridges, buildings, etc., can solve the problems of not being able to meet the construction load of large-span cap beams, achieve good promotion and application value, reduce pre-embedded requirements, and improve structures The effect of force

Pending Publication Date: 2020-01-17
重庆建工建筑产业技术研究院有限公司 +2
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

[0003] To sum up, the problem existing in the prior art is that the existing construction method cannot meet the requirement of large construction load of the long-span cap beam

Method used

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  • Prestressed steel structure front-pulling and rear-locking cast-in-place platform construction method
  • Prestressed steel structure front-pulling and rear-locking cast-in-place platform construction method

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Embodiment 1

[0070] 1. Background

[0071] The roads and ancillary projects of the east extension section of Huanan Road in Chongqing Chemical Industry Park are located in the Changshou Chemical Industry Park in the eastern suburbs of Chongqing. The K1+242.60 medium bridge in this project, the mileage and pile number is K1+205.100, the design elevation is 268.734m, the design longitudinal slope is -2.00%, the bridge deck is 26.00m in full width, located on the curve, and the upper structure is made of post-tensioned prestressed concrete. Continuous box girder, U-shaped abutment and open-cut foundation are adopted for substructure abutment, and column pier and pile foundation are adopted for pile pier.

[0072] The construction technology of a large-span cap beam unsupported prestressed steel structure platform. At the node of the cap beam pier column bracket, the PVC pipe is embedded in the pier column to resist the tension of the bracket pier column node, and the vertical shear force is throug...

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Abstract

The invention belongs to the technical field of constructional engineering construction, and discloses a prestressed steel structure front-pulling and rear-locking cast-in-place platform constructionmethod which comprises the steps that an overall construction scheme is determined, and construction preparation is conducted; stress analysis and setting are conducted on the bracket, and meanwhile stress checking calculation of pier column structure joints is conducted under the load effect; pre-stressed steel structure platform embedded part construction is conducted; pier column bracket section pouring is conducted; the inner and outer brackets are installed; according to the actual situation, a bowl buckle support is adopted for height adjustment, or profile steel and a bailey beam are directly adopted as distributive girder installation formworks, and bracket upper structure pouring platform construction is conducted; an integral model is established to calculate and analyze the prestress application of the node on the bracket, and the prestress of the upper tension node is applied based on the calculation result; a load test is carried out; and an upper structure is poured andthe bracket is detached. The construction method is well applied to a plurality of projects, successfully solves the construction problem of the bent cap bracket with large span load, and has good popularization and application values.

Description

Technical field [0001] The invention belongs to the technical field of construction engineering, and in particular relates to a construction method of a pre-stressed steel structure with a pre-tensioned steel structure, which is pulled forward and locked behind a cast-in-place platform. Background technique [0002] At present, the closest existing technology: As my country's infrastructure construction continues to advance rapidly, bridge engineering construction technology is changing day by day. Long-span, tall bridge pier cap beam structure is very common in municipal engineering. During the construction of large-span capping beams, it is often difficult to use floor supports for construction due to topographical constraints. During construction, it is a common construction measure to embed brackets on the bridge piers to provide a construction platform for capping beams. For solid piers, the pre-embedded bracket method is generally easier to implement, but the large-span ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E01D21/00
CPCE01D21/00
Inventor 杨东李永福刘懿冯家冬向楠杨佳桦
Owner 重庆建工建筑产业技术研究院有限公司
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