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Method for longitudinal arrangement of temporary bracings in transverse-partitioning construction of steel box girder

A longitudinally arranged, steel box girder technology, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of low reinforcement efficiency, insignificant improvement effect of deformation and stress, etc.

Active Publication Date: 2017-03-29
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The traditional reinforcement method chooses to reinforce the whole span or only reinforce the middle part, the reinforcement efficiency is low, and the improvement effect of deformation and stress is not obvious

Method used

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  • Method for longitudinal arrangement of temporary bracings in transverse-partitioning construction of steel box girder
  • Method for longitudinal arrangement of temporary bracings in transverse-partitioning construction of steel box girder
  • Method for longitudinal arrangement of temporary bracings in transverse-partitioning construction of steel box girder

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Embodiment Construction

[0013] Such as figure 1 As shown, the temporary support form is X-shaped scissors, and the fulcrum of the scissors is set at the junction of the diaphragm and the top and bottom plates; figure 2 As shown, the transverse bridge support is separated by a longitudinal rib at the opening side of the beam block missing web; the longitudinal bridge layout method is as follows: Figure 3-1 As shown, first, two temporary scissor braces are arranged at the two ends of the opening side respectively, and then the modeling analysis is carried out to compare the slippage of the top and bottom plates; as Figure 3-2 As shown in , place the other two temporary scissors at the place with the largest slip, conduct modeling analysis again, compare the slip of the top and bottom plates, and set up temporary scissors at the place with the largest slip; and so on until the deformation satisfies Welding requirements. The temporary scissors bracing is arranged in the transverse direction of the b...

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Abstract

The invention discloses a method for longitudinal arrangement of temporary bracings in transverse-partitioning construction of a steel box girder. The method particularly comprises the following steps: as a top plate and a bottom plate at an end part have the maximum slippage after the steel box girder is partitioned transversely, arranging two temporary cross bracings at two end parts on an opening side respectively, and then making a modeling analysis to compare the slippage of the top plate and the bottom plate; arranging another two cross bracings at parts with the maximum slippage, and making a modeling analysis to compare the slippage of the top plate and the bottom plate; and repeating the process until deformation meets engineering requirements. The temporary bracings are arranged on the web-absent opening side of a bridge block in the transverse direction of a bridge, with one longitudinal stiffening rib behind, and the supporting points of the temporary bracings are set at the junctions of diaphragm plates and the top and bottom plates. Through the method, the mid-span deflection can be reduced to the greatest extent with fewest temporary bracings. The method is simple and easy and maximizes the supporting efficiency.

Description

technical field [0001] The invention relates to a hoisting construction method for steel box girder bridges that are horizontally divided into blocks and vertically divided into sections, and temporarily reinforces the steel box girder bridges that are opened after the division, and in particular relates to a method for vertically arranging temporary supports for steel box girder transversely divided into blocks. Background technique [0002] The construction of urban viaducts is often subject to site and traffic restrictions, requiring fast construction speed and little impact on the surrounding environment. Large-scale hoisting equipment cannot be used to meet traffic requirements during construction. Therefore, the urban elevated steel box girder bridge usually adopts the construction method of vertically or horizontally segmented, hoisted in place and spliced ​​into a whole. However, the transverse division of the steel box girder often makes the symmetrically closed ste...

Claims

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Application Information

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IPC IPC(8): E01D21/00E01D21/06
CPCE01D21/00E01D21/06
Inventor 汪劲丰王敏权申屠倩芸王文浩周玉冰陈春雷向华伟张江涛张良
Owner ZHEJIANG UNIV
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