Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges

A construction method and rigid-frame bridge technology, applied in bridges, bridge materials, bridge construction, etc., can solve problems such as high site requirements, high requirements, and impact on traffic, and achieve equipment and time saving, significant economic benefits, and convenient operation Effect

Active Publication Date: 2010-04-07
NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are two commonly used methods for the construction of oblique-leg rigid frame bridges. One is the bracket method construction. The construction of the entire beam body is completed by setting up the bracket vertical formwork. It is characterized by low equipment requirements, but high site requirements, which affect traffic; the second is The method of construction without support, after horizontal rotation or vertical rotation, the girder body cantilevered by hoisting and balancing equipment such as cable towers, is characterized in that no support is

Method used

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  • Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges
  • Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges
  • Construction method for back cable-balancing single-side cantilever concreted beam bodies of slant-legged rigid frame bridges

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Embodiment 1: construction of side span 2

[0034] Such as figure 1 , figure 2 , on the abutment 8 on both sides of the bridge, the corresponding side span 2 pre-embeds the corrugated pipe 1 and the anchor backing plate, or reserves the pipe fittings that can penetrate the balance back cable 3, and the abutment 8 on both sides of the bridge, the inclined leg foundation After the construction of , oblique legs and No. 0 block 5 is completed, military piers and military beams are used as supports for installing side spans 2 to carry out cast-in-place construction of side spans 2 on both sides.

[0035] The construction procedure is:

[0036] 1.1. Ground treatment. The military pier foundations are all made of concrete foundations and placed on stable rock foundations to ensure that the foundations do not settle.

[0037] 1.2. Erection of military piers and erection of military beams.

[0038] 1.3. Bracket preload. Put the bottom mold on the military beam, and stack...

Embodiment 2

[0051] Example 2: Construction of mid-span 6 and mid-span closing section 7

[0052] see image 3 , Figure 4 , after the side span 2 and the abutment body of the abutment 1 are temporarily locked, the hanging basket 4 can be installed, and the cantilever pouring of the mid-span 6 can be carried out, that is, the hanging basket 4 is used to cantilever from the oblique leg and No. 0 block 5 to the mid-span pouring in sections to form the mid-span 6 until the mid-span 6 is closed in the middle of the span. The pouring process of the mid-span 6 is as follows: the bottom formwork and the outer formwork are installed on the beam section corresponding to the mid-span 6 on the hanging basket 4, the inner formwork is placed on the top surface of the bottom plate, and then concrete is poured, tensioned and grouted.

[0053] 2.1. The process of hanging basket construction

[0054] Hoisting hanging basket 4 and bottom formwork platform, installing bottom formwork → hoisting outer form...

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PUM

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Abstract

The invention provides a construction method for back-cable-balance single-side cantilever concreted beam bodies of slant-legged rigid frame bridges, which belongs to the technical field of bridge construction. The method comprises the following steps: A, pre-embedding corrugated tubes (1) and anchor plates in corresponding side spans (2) on abutments (8); B, pre-embedding the corrugated tubes (1) in the side spans (2), concreting the side spans (2), passing and stretching balance back cables (3) into the corrugated tubes (1) and temporarily locking the side spans (2) with the abutments (8); C, adopting movable suspended scaffolding (4) to concrete a middle span (6) from slant legs and a No. 0 block (5) to a span-middle cantilever-type subsection; and D, allowing the abutments (8) at two ends to simultaneously remove the balance back cables (3) after a middle-span closure section (7) is concreted. The method has the advantages of simple process, no need for large-sized lifting-balancing equipment, no limit to sites, high bridge quality, few construction brackets, low cost and applicability particularly to the construction of large-span slant-legged rigid frame concrete bridges in high mountains and deep valleys.

Description

technical field [0001] The invention belongs to the technical field of civil engineering bridges, and in particular relates to a construction method for back-cable-balanced unilateral cantilever pouring beams of oblique-leg rigid-frame bridges. Background technique [0002] The oblique leg rigid frame bridge is tall and straight in shape, light and beautiful, simple in structure, good in integrity, and has the advantages of continuous beam and arch bridge in force, so it has been applied in domestic highways and railways. [0003] There are two commonly used methods for the construction of oblique-leg rigid frame bridges. One is the bracket method construction. The construction of the entire beam body is completed by setting up the bracket vertical formwork. It is characterized by low equipment requirements, but high site requirements, which affect traffic; the second is The method of construction without support, after horizontal rotation or vertical rotation, the girder bo...

Claims

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Application Information

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IPC IPC(8): E01D21/10E01D101/28
Inventor 游国平刘素云何磊任文成
Owner NO 4 ENG CO LTD OF CHINA RAILWAY 11 BUREAU GRP
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