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A Construction Method of Fine Secondary Control of Bridge Alignment

A secondary control and construction method technology, applied in bridges, bridge construction, erection/assembly of bridges, etc., can solve problems such as poor alignment control, and achieve the effects of easy to mark high precision, improve alignment accuracy, and easy control

Active Publication Date: 2019-12-10
湖州市交通工程建设集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to solve the problem of poor alignment control in the traditional cantilever construction of variable-section box girders, and to provide a construction method that is easy to operate and can improve the accuracy of bridge alignment

Method used

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  • A Construction Method of Fine Secondary Control of Bridge Alignment
  • A Construction Method of Fine Secondary Control of Bridge Alignment
  • A Construction Method of Fine Secondary Control of Bridge Alignment

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0032] A construction method for fine secondary control of bridge alignment, comprising the following steps:

[0033] a. Installation template 4;

[0034] Such as figure 1 Schematic diagram of hanging basket cantilever pouring construction for the nth segment of the continuous beam, the bridge includes pier 2, web 3, hanging basket 1 includes lifting and lowering device 11, and lifting and lowering device 11 also includes straps or booms for fixing the formwork. After the pouring of the n-1 section is completed, the hanging basket 1 is moved forward to the nth section, and the formwork 4 is installed under the hanging basket 1 at the same time, and fixed by a sling or a boom.

[0035] b. Elevate the formwork 4, wherein the actual elevation Hn = design elevation + construction pre-camber + reserved height, and then fix the formwork 4;

[0036] Such as figure 2 As shown, use the elevation adjustment device to adjust the elevation of the formwork 4. In the traditional cantile...

Embodiment 2

[0044] Such as Figure 6 to Figure 8 As shown, the difference between embodiment 2 and embodiment 1 is that the template in embodiment 2 adopts a segmented template, and the template is composed of more than 3 template segments. Since the length of the standard segment is usually 4.8m, the template in embodiment 2 Consists of 4 template segments of equal length. In Embodiment 2, the step f demoulding the formwork includes: fixing the first formwork segment 41 close to the cantilever side with the fixture 6, demolding the remaining formwork segments 42, 43, 44, lowering them, and moving forward to the lower One segment is fixed.

[0045] The method of moving and overlapping the segmented formwork has the following advantages: First, because the formwork section 41 at the transition between the two sections is fixed, it can be used as a positioning reference for the reinstallation of the remaining formwork sections, effectively improving the efficiency of the formwork Repositi...

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Abstract

The invention discloses a bridge linear fine secondary control construction method which solves the problem of poor linear control in traditional cantilever construction of a box girder with a variable cross-section. According to the key points of the technical scheme, the bridge linear fine secondary control construction method comprises the following steps that a formwork is mounted; elevation is conducted on the formwork, the actual elevation is equal to the sum of the design elevation, the construction pre-arch degree and the reserved height, and the formwork is fixed; concrete is poured,the concrete with a proportion greater than 60% and less than 100% is poured, and the elevation is measured again; the elevation is corrected, and the formwork is downwards-placed to the corrected height; remaining concrete is continuously poured until the concrete is connected with the previous section of concrete; and the process is repeated until closing is conducted. According to the bridge linear fine secondary control construction method, secondary elevation is conducted when pouring of the concrete is nearly completed, a deviation correction link is added, and the linear precision is effectively improved; and meanwhile, a reserved height is added relative to a traditional elevation during first-elevation, after subsequent elevation re-measuring, the elevation is adjusted through descending of the formwork, more labor is saved, the elevation accuracy is easier to control.

Description

technical field [0001] The invention relates to the field of bridge construction, in particular to a construction method for controlling the alignment of variable-section box girders. Background technique [0002] The alignment control of the variable cross-section box girder is an important part of its construction process. The smooth alignment of the bridge and its compliance with the design requirements not only affect the overall beauty of the bridge, but also affect the rationality of the structural force of the entire bridge, and even affect the reliability of the bridge. At present, the cantilever method is the most commonly used construction method in the construction of continuous beams of long-span bridges. The cantilever construction method starts from the pier, and the two sides are symmetrically cast in-situ segment by segment or the prefabricated segments are assembled symmetrically. From the principle of the cantilever method, it can be seen that the cantileve...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01D21/10
CPCE01D21/10
Inventor 陈小勇王筱骅夏赟飞
Owner 湖州市交通工程建设集团有限公司