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A method for controlling the full welding height of the steel box girder of the support section

An elevation control, steel box girder technology, applied in welding equipment, auxiliary welding equipment, welding/cutting auxiliary equipment, etc., can solve the problems of angle change between beam sections, difficulty in correction, error, etc.

Active Publication Date: 2022-05-03
CCCC SHEC FOURTH ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the long installation length of the current steel box girder, it is installed in multiple sections, and the two adjacent steel box girders are fixed by welding; however, the angle between the beam sections may change after welding between two adjacent beam sections , for the cantilever installation beam section, this change can also be obtained according to the positioning measurement and the measurement after connection, but for the bracket installation beam section, this change will be covered up and reflected in the change of the temporary pad reaction force, and once the frame is dropped The connection deformation will be released. At this time, a large error may have been caused and it is difficult to correct; therefore, there is an urgent need for a control method for the full welding elevation of the steel box girder of the support section that can control the error.

Method used

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  • A method for controlling the full welding height of the steel box girder of the support section
  • A method for controlling the full welding height of the steel box girder of the support section

Examples

Experimental program
Comparison scheme
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Embodiment 1

[0017] Example 1: See figure 1 with figure 2 , a method for controlling the full welding elevation of a support section steel box girder in this embodiment includes the following steps: S1: Set the installed steel box girder as the first beam section 1, and set the beam sections to be installed as the first beam section according to the installation sequence The second beam section 2, the third beam section 3 to the Nth beam section; S2: erect the second beam section 2 to the installation side of the first beam section 1, and set jacks at both ends of the bottom of the second beam section 2, And detect the jacking force of the second beam section 2 supported by the jack, and record the jacking force as P1 and P2; S3: Install the support pad at the bottom of the second beam section 2, unload the jack and keep the second beam section 2 after the jack is unloaded The elevation is the elevation in the state of step S2; S4: Weld the first beam section 1 and the second beam sectio...

Embodiment 2

[0018] Example 2: See figure 1 with figure 2 , in this embodiment, the shrinkage of the weld 4 before and after the installation of the support pad after two adjacent beam sections are welded is measured, and is compared with the elevation change X for reference of the beam section behind the installation. The two sets of data are compared for reference, which further improves the accuracy of compensation data and reduces construction errors. This embodiment includes detecting the shrinkage of the weld 4 between the top plates of two adjacent beam sections and the shrinkage of the weld 4 between the two bottom plates. In this embodiment, the jacks at both ends are arranged symmetrically on the left and right sides of the beam section. Make the jacks on both sides bear the force evenly. There are two sets of support pads in this embodiment, which are arranged symmetrically on the left and right sides of the beam section. Uniform force, easy to carry the beam section. The ...

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PUM

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Abstract

The invention discloses a method for controlling the full welding elevation of a support section steel box girder, comprising the following steps: S1: setting the steel box girder as the first beam section, the second beam section to the Nth beam section in sequence according to the installation sequence; S2: Erect the second beam section to the installation side of the first beam section, and set jacks at both ends of the bottom of the second beam section, and record the jacking force as P1 and P2; S3: Install the support pad at the bottom of the second beam section, Unload the jack and keep the elevation of the second beam section after the jack is unloaded as the elevation in the state of step S2; S4: Weld and fix the first beam section and the second beam section; S5: Lift the second beam section with a jack, and remove the pad , and adjust the top force of the jacks at both ends to P1 and P2; S6: measure the elevation change X of the second beam section; S7: install a support pad at the bottom of the second beam section, and maintain the elevation of the second beam section after unloading the jacks at both ends is the elevation in the state of S5; S8: Weld the third beam section according to steps S1-S7, and when installing the third beam section, the third beam section performs positioning compensation according to the elevation change X; S9: Install to the Nth beam section in sequence .

Description

technical field [0001] The invention relates to the field of installation of steel box girders, in particular to a method for controlling the full welding elevation of a steel box girder at a support section. Background technique [0002] Steel box girder, also known as steel plate box girder, is a commonly used structural form of long-span bridges. Generally used on bridges with large spans, it is called a steel box girder because it looks like a box; steel box girders are generally connected by full welding of the top plate, bottom plate, web plate, diaphragm, longitudinal diaphragm and stiffeners. made. Due to the long installation length of the current steel box girder, it is installed in multiple sections, and the two adjacent steel box girders are fixed by welding; however, the angle between the beam sections may change after welding between two adjacent beam sections , for the cantilever installation beam section, this change can also be obtained according to the po...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23K37/00
CPCB23K37/00
Inventor 田雨金汤叶帅周胜国陈子阳饶曦郑文武吴凤明梁良林昭阅
Owner CCCC SHEC FOURTH ENG