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Construction process for triangular area of open-web rigid frame bridge

A technology of construction technology and triangular area, applied in the direction of bridges, bridge construction, erection/assembly of bridges, etc., can solve the problems of high mutual influence of upper and lower chord loads, high construction costs, and high safety risks, so as to avoid the safety of construction operations. risk, optimize the stress of the system, and improve the effect of security

Active Publication Date: 2020-06-26
上海远通路桥工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

During the construction of the upper and lower chord box girders, there are many cross operations, the structural system is relatively complex, the mutual influence of the upper and lower chord loads is high, the construction control is difficult, the quality controllability is low, the safety risk is large, and the construction cost is high

Method used

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  • Construction process for triangular area of open-web rigid frame bridge
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  • Construction process for triangular area of open-web rigid frame bridge

Examples

Experimental program
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Effect test

Embodiment 1

[0056] This embodiment provides a construction technique for the triangular area of ​​an empty-bellied rigid frame bridge. Centering on the No. 0 beam section, hanging baskets are used to hang and cast the rest of the beam sections symmetrically to both sides. Each beam section includes upper chord beam section 19 and lower chord section The beam section 20, during the construction process, the lower string beam section 20 was constructed earlier than the upper string beam section 19 by two beam sections;

[0057] In the construction process of No. 1~n beam sections, support columns are not set for cantilever casting; when construction of No. The support is poured, and the buckle cables are tensioned after the 2~m beam sections of the lower chord are poured. Among them, n is the number of the beam section where the column is installed for the first time, and m is the number of the intersection beam section in the triangular area.

[0058] In the present invention, support colu...

Embodiment 2

[0060] On the basis of Embodiment 1, this embodiment provides a construction technique for the triangular area of ​​a hollow rigid frame bridge, in which the cantilevered down-curved steel tendons 15 are laid on the web surface of the upper chord 1-n beam sections. Such as Figure 8 shown.

[0061] In the web section of the beam section No. 1~n (n is the number of the beam section where the support column 4 is installed for the first time) on the upper chord, the cantilevered down-curved steel tendons 15 are arranged, and the vertical beams 15 are provided in the cantilevered construction of the upper chord segment through the down-bent steel beams 15. The section with downbending steel beams 15 can realize balanced cantilever construction by itself, thereby optimizing the number of support columns, avoiding the safety risk of the construction operation of the support columns of the (n-1) sections, and improving safety Guarantee, save the construction period, and optimize the...

Embodiment 3

[0063] On the basis of Example 1, this example provides a construction technique for the triangular area of ​​a hollow rigid frame bridge, and the construction process of beam sections 1 to n is as follows:

[0064] Step 1) The upper chord of the triangular area is equipped with the upper chord hanging basket 1, and the lower chord is equipped with the lower chord hanging basket 2. After assembling the upper chord hanging basket 1 on the No. The bottom basket 3 pours the No. 1 beam section of the lower chord, and then the hanging basket 1 of the upper chord travels to the No. 1 beam section of the upper chord, and then pours the No. 2 beam section of the lower chord; figure 1 shown;

[0065] Step 2) Carry out the buckling and threading of the No. 2 beam section of the lower string, and then stretch the buckle cable of the No. 2 beam segment of the lower string, retain the bottom basket 3 of the hanging basket of the lower string, and pour the No. 3 beam section of the lower st...

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Abstract

The invention provides a construction process for a triangular area of an open-web rigid frame bridge. Suspension casting downward-bent steel bundles are arranged in the sections of webs of the firstto nth beam sections of the upper chord. Vertical force in upper chord section suspension casting construction is provided through the lower bent steel bundle; the sections provided with the downwardbent steel bundles can achieve balanced cantilever construction, the number of the supporting stand columns is further optimized, the construction operation safety risk of the supporting stand columnsof the (n-1) sections is avoided, the safety guarantee is improved, the construction period is shortened, and the complex system stress condition of a triangular area is optimized. Supporting stand columns are only arranged between n-m beam sections of the upper chord and the lower chord to support the n-m beam sections. The upper chord hanging basket does not cross the stand column; the mobile end is downwards embedded in the bottom fixed section, a fixed stand column is changed into a telescopic adjustable supporting stand column, the problems of conflict between a hanging basket bottom basket and the stand column, complex procedures of refitting the hanging basket bottom basket and the like are solved, cast-in-place concrete wet weight is completely borne by the hanging basket, the stress condition of a steel pipe stand column and a buckle cable is improved, and the overall safety reserve of the structure is improved.

Description

technical field [0001] The invention belongs to the technical field of construction of fasting rigid frame bridges, and in particular relates to a construction technique for the triangular area of ​​fasting rigid frame bridges. Background technique [0002] With the completion and opening of Beipanjiang Super Bridge, the first fasting rigid frame bridge with a main span of 290m in China, the construction of fasting rigid frame bridges in China has gradually increased. Under the condition that the technology is feasible, the cost and the construction period allow, optimizing the construction process of the hollow triangle area of ​​this bridge, ensuring construction safety, and improving the construction quality of segmental beams have become key construction problems in the construction of this bridge. [0003] The construction method adopted in the construction process of the triangular area of ​​the precedent project is "fixed support columns on the upper chord combined wi...

Claims

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Application Information

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IPC IPC(8): E01D21/10
CPCE01D21/10
Inventor 孙克强李松李百富韦玉林王佳军陈波
Owner 上海远通路桥工程有限公司
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