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Combined Preloading Method of Concrete Box Girder Steel Tube Bracket for Mixed Girder Cable-Stayed Bridge

A concrete box girder and combined preloading technology, which is applied in cable-stayed bridges, bridges, bridge construction, etc., can solve the problems of inability to meet the high standard requirements of concrete box girder steel pipe brackets of hybrid girder cable-stayed bridges, and achieve good economic effects, The effect of high material turnover and simple method

Active Publication Date: 2020-03-10
ROAD & BRIDGE INT +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The purpose of the invention is to solve the problem that the traditional sand bag and water bag preloading methods cannot meet the high standard requirements of the concrete box girder steel pipe support of the mixed beam cable-stayed bridge, improve the traditional preloading process, and provide a safe, convenient, fast, Economical and efficient pre-compression construction technology of concrete box girder steel pipe support of main bridge of mixed girder cable-stayed bridge

Method used

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  • Combined Preloading Method of Concrete Box Girder Steel Tube Bracket for Mixed Girder Cable-Stayed Bridge
  • Combined Preloading Method of Concrete Box Girder Steel Tube Bracket for Mixed Girder Cable-Stayed Bridge
  • Combined Preloading Method of Concrete Box Girder Steel Tube Bracket for Mixed Girder Cable-Stayed Bridge

Examples

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Embodiment Construction

[0034] The implementation process of the present invention will be described below in conjunction with the embodiments and accompanying drawings.

[0035] A super-large bridge constructed by the applicant is a hybrid girder cable-stayed bridge with long side span cast-in-place section, large girder width and single box section, long cantilever length at both ends, self-heavy cast-in-place section, difficult construction, and high requirements for steel pipe supports. Therefore, the steel pipe support preloading process is used for verification.

[0036] The side span cast-in-place section does not preload the flange and inclined web. The preloading test material adopts the joint action of concrete blocks, steel strands and water storage, and simulates the working conditions of concrete pouring for loading. The large concrete block used for loading is calculated as 2.4t / block, the small concrete block is calculated as 1t / block, the average weight of the steel strand is 3.8t / bu...

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Abstract

The invention provides a combined preloading method of steel tube supports for concrete box girder of mixed beam cable-stayed bridge, wherein concrete blocks are piled up along the box girder horizontally on the support formwork, steel strands are piled up along the longitudinal web, and canvas water injection is laid in the area surrounded by the transverse diaphragm and the longitudinal web; thesteel strands are piled up along the longitudinal web; The scaffolds are preloaded by the materials mentioned above, and the deformation of the scaffolds under each preloading is observed. Accordingto the elastic and inelastic deformation values of the scaffolds, the scaffolds are adjusted to the elevation value of the vertical mould.

Description

technical field [0001] The invention belongs to the field of bridge engineering construction and relates to a preloading method applied to a concrete box girder steel pipe support of a main bridge of a mixed girder cable-stayed bridge. Background technique [0002] During the construction of hybrid girder cable-stayed bridges, Bailey brackets and driven steel pipe piles are often used as load-bearing piles. The brackets may settle during the concrete pouring process, which will affect the overall force of the brackets. In order to avoid uneven settlement during pouring, it is necessary to preload the support before construction to accurately know the inelastic and elastic deformation of the support under load, test the strength, stiffness and stability of the support, and determine the formwork The adjustment value of the bottom elevation ensures that the actual alignment of the bridge after completion is as consistent as possible with the theoretical alignment. [0003] Th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/00E01D11/04E01D2/04
CPCE01D2/04E01D11/04E01D21/00
Inventor 闫永杰张铮侯兆隆浦长见张雨宾刘志峰
Owner ROAD & BRIDGE INT
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