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Receding construction method of cradle of continuous girder bridge made of prestressing concrete

A construction method and prestressing technology, applied to bridges, bridge construction, erection/assembly of bridges, etc.

Active Publication Date: 2011-01-26
NO 1 ENG CO LTD OF CR11BG +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is aimed at the construction of beam bridges spanning existing railway lines or highways, only considering the forward movement of the hanging basket in the cantilever construction, and cannot return to the first cantilever construction section after closing construction, so as to ensure safety Effectively unload the hanging basket system

Method used

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  • Receding construction method of cradle of continuous girder bridge made of prestressing concrete
  • Receding construction method of cradle of continuous girder bridge made of prestressing concrete
  • Receding construction method of cradle of continuous girder bridge made of prestressing concrete

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Embodiment Construction

[0045] The gantry truss walking device of the present invention is formed by adding an auxiliary gantry on the outside of the main truss beam, and the main truss includes upper and lower beams, front and rear oblique pull beams, columns or channel steel columns connected. Adding a sub-gantry on the outside is to make an extended sub-gantry; the extended sub-gantry is made of channel steel and angle steel.

[0046] In the construction equipment of the present invention, it mainly includes lengthening the front top crossbeam 2, the front bottom crossbeam 15 and the rear bottom crossbeam (20). ), beam pin seat, jack connection), hanging basket back and other steps.

[0047] In the implementation shown in Fig. 3, Fig. 4 and Fig. 5, when making the outstretched sub-gantry 25, at first utilize two 12 channel steels to be welded side by side to form the combination of the outstretched sub-gantry pole beams 27, and the two channel steels The spacing is 40mm--50mm, and the top of the ...

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Abstract

The invention relates to a receding construction method of a cradle of a continuous girder bridge made of prestressing concrete, which is characterized in that the bridge surface of a bridge prefabricated by concrete is provided with a track and a door-shaped truss traveling device, and the width of a ceiling girder inside the door-shaped truss traveling device is wider than that of the bridge surface by 90cm-110cm; a front bottom cross beam and a rear bottom cross beam must extend to the outer side of an external mold by 45cm-55cm to form a main cradle truss, and an overhanging auxiliary doorframe is additionally arranged outside the main cradle truss, after the construction of a closure segment of the bridge prefabricated by concrete is finished, and precise rolling deformed steel barswith the diameter of 32 outside a box girder positioned on the overhanging auxiliary door frame are connected with the rear bottom cross beam to disassemble a rear hanging strip; a bottom mold frame is separated from a beam body by utilizing a manual spiral type jack to loose the precise rolling deformed steel bars positioned on the door frame and the front bottom cross beam; a leading chain or ahoist are utilized to drive the main cradle truss so that the cradle recedes in a slideway to a first cast-in-situ segment; and a bottom mold and the external mold are fallen by the leading chain or the hoist to disassemble the main truss.

Description

technical field [0001] The invention relates to a method for cantilever cast-in-place construction of a prestressed concrete continuous girder bridge hanging basket, in particular to a method for retracting the construction of the hanging basket after the cantilever beam crossing a railway or a highway is cast-in-place. Background technique [0002] The existing prestressed concrete continuous girder bridges are mainly constructed by hanging basket cantilever pouring, especially in the construction of long-span continuous bridges spanning existing railway lines or crossing expressways, the cantilever pouring method has become an effective construction method , and the hanging basket is the main equipment for cantilever pouring construction. [0003] The hanging basket is a load-bearing structure that can slide or roll along the top of the beam. It is anchored and suspended on the front end beam section that has been constructed. The formwork, steel bars, and prestressed pipe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/10
Inventor 李明罗长友周晗曾理飞
Owner NO 1 ENG CO LTD OF CR11BG
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