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Cast-in-situ beam-making construction method of assembled support

A construction method and assembly technology, applied in the erection/assembly of bridges, bridges, bridge construction, etc., can solve the problems of large investment in mobile formwork, low equipment reuse rate, inability to arbitrarily adjust hole spans, etc., and achieve convenient installation. Effect

Active Publication Date: 2008-12-31
CHINA RAILWAY 20 BUREAU GRP +8
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The investment of mobile formwork is large, a set needs about 6 million, the components need special processing, and the transportation and assembly require the cooperation of a large-tonnage crane. At the same time, due to the limitation of working conditions, the hole span cannot be adjusted arbitrarily
After use, the equipment reuse rate is extremely low

Method used

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  • Cast-in-situ beam-making construction method of assembled support
  • Cast-in-situ beam-making construction method of assembled support

Examples

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Embodiment Construction

[0013] Application of the present invention on Hutou village super large bridge.

[0014] The Hutou Village Bridge is 627.20m long and is a 19-32m double-line simply supported box girder bridge. There are three types of foundations: expanded foundation, dug well, and pile foundation; the piers are all of equal cross-sectional size, with two types of 6×2m and 6×2.6m, and the highest pier height is 17.5m. The structural size of the beam is 32.6×13×3.0m, the bottom width is 5.68m, and the cross-section is a simple-supported box girder with a single box and a single room. The intersections are all excessively rounded. The ground surface is new loess with a collapsible bearing capacity of 160Kpa; the lower layer is old loess with a bearing capacity of 300Kpa.

[0015] 1. Ground treatment

[0016] The surface layer is new loess and old loess, and the lower layer is breccia and limestone. The new loess has a low collapsible bearing capacity, and the old loess has a bearing capacit...

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Abstract

Disclosed is a construction method of producing a beam in situ by pouring an assembly-style bracket, which is characterized in that a foundation is treated by cement compaction piles into a composite foundation; that buttresses in a support system adopt Bailey cranes and vertical load-bearing beams adopt military beams; that a box beam formwork is formed by combining such three major parts as a bottom mold, an external mold and an internal mold; wherein the bottom mold is formed by matching large pieces of flat steel templates; the external mold adopts a light welded steel structure, the internal mold adopts a screw mechanical contraction steel structure and is formed by matching the segments, and both the external mold and the internal mold can slip along a railway which is disposed on the military beam. The construction method has advantages that: 1. the load-bearing capacity of the composite foundation can reach up to 239KPa so as to meet the load-bearing requirement of the middle buttress; 2. the assembly-style bracket only costs about 3.7 million, the components thereof are standing parts so that installation is convenient. In addition, the moving of the external mold is beyond the restriction of box beam ages, as long as the intensity is satisfied, the external mold can be drilled with holes. The assembly-style bracket can be used as construction equipment such as a gantry, an erecting crane and a makeshift bridge after construction and can be reused repeatedly.

Description

Technical field: [0001] The invention relates to a construction method of a large-tonnage box girder of a bridge by a cast-in-situ method, in particular to a construction method of an in-situ cast-in-place beam of an assembled support. Background technique: [0002] There are two main construction methods for the cast-in-place construction of the box girder of the railway passenger dedicated line: the mobile formwork method and the bracket method. The investment of mobile formwork is large, a set needs about 6 million, the components need to be specially processed, and the transportation and assembly require the cooperation of a large-tonnage crane. At the same time, due to working conditions, the hole span cannot be adjusted arbitrarily. After use, the equipment reuse rate is extremely low. Invention content: [0003] The purpose of the present invention is to provide a construction method for in-situ cast-in-place beams with assembled supports, which has low constructio...

Claims

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Application Information

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IPC IPC(8): E01D21/00E01D2/04E02D27/10
Inventor 任少强丁大有马西章颜健褚红艳周金红李科寥太昌郭晓鹏杨万仁
Owner CHINA RAILWAY 20 BUREAU GRP
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