CN112935635B - Support section steel box girder all-welded elevation control method - Google Patents
Support section steel box girder all-welded elevation control method Download PDFInfo
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- CN112935635B CN112935635B CN202110060789.XA CN202110060789A CN112935635B CN 112935635 B CN112935635 B CN 112935635B CN 202110060789 A CN202110060789 A CN 202110060789A CN 112935635 B CN112935635 B CN 112935635B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K37/00—Auxiliary devices or processes, not specially adapted to a procedure covered by only one of the preceding main groups
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Abstract
The invention discloses an all-welded elevation control method for a support section steel box girder, which comprises the following steps of: s1: the method comprises the following steps of sequentially arranging the steel box girder into a first girder section, a second girder section to an Nth girder section according to the installation sequence; s2: erecting the second beam section to the installation side of the first beam section, arranging jacks at two ends of the bottom of the second beam section, and recording jacking forces as P1 and P2; s3: installing a support pad at the bottom of the second beam section, unloading the jack and keeping the elevation of the second beam section after the jack is unloaded as the elevation in the state of the step S2; s4: welding and fixing the first beam section and the second beam section; s5: jacking the second beam section by using a jack, removing the support pad, and adjusting the jacking force of jacks at two ends to be P1 and P2; s6: measuring the elevation change X of the second beam section; s7: mounting a support pad at the bottom of the second beam section, and keeping the elevation of the second beam section as the elevation in the S5 state after unloading jacks at two ends; s8: welding a third beam section according to the steps S1-S7, and carrying out positioning compensation on the third beam section according to the elevation change X when the third beam section is installed; s9: in turn mounted to the nth beam segment.
Description
Technical Field
The invention relates to the field of steel box girder installation, in particular to a support section steel box girder all-welded elevation control method.
Background
The steel box girder is also called steel plate box girder, and is a common structural form of a large-span bridge. The steel box girder is generally used on a bridge with a large span and is called as a steel box girder because the shape is like a box; the steel box girder is generally formed by connecting a top plate, a bottom plate, a web plate, a transverse clapboard, a longitudinal clapboard, a stiffening rib and the like in a full-welding mode. The existing steel box girders are long in installation length, so that the steel box girders are installed in multiple sections, and two adjacent steel box girders are fixed in a welding mode; however, after welding between two adjacent beam sections, the included angle between the beam sections may change, and for the cantilever-mounted beam section, the change can also be obtained according to positioning measurement and measurement after connection, but for the bracket-mounted beam section, the change amount is covered and reflected on the change of the reaction force of the temporary support pad, and once the bracket is dropped, the connection deformation is released, and at this time, a large error may be caused and is difficult to correct; therefore, an all-welded elevation control method for the support section steel box girder, which can control errors, is urgently needed.
Disclosure of Invention
The invention aims to solve the technical problems and provides an all-welded elevation control method for a steel box girder of a bracket section, which comprises the steps of recording the load of a jack of a new girder section before welding, and restoring the load of the jack of the new girder section before welding after welding; and then measuring elevation change, correcting when the next beam section is positioned, and performing compensation correction in advance to reduce installation errors.
The included angle between two adjacent beam sections can be changed after welding, for the cantilever installation beam section, the change can be obtained according to positioning measurement and measurement after connection, but for the bracket installation beam section, the variable quantity can be covered to be reflected on the change of the counter force of the temporary support pad, once the bracket is dropped, the connection deformation can be released, and at the moment, a larger error can be caused and the correction is difficult.
Therefore, according to the technical problems, the technical scheme adopted by the invention is as follows: an all-welded elevation control method for a support section steel box girder comprises the following steps: s1: setting the installed steel box girder as a first girder section, and sequentially setting girder sections to be installed as a second girder section, a third girder section and an Nth girder section according to the installation sequence; s2: erecting the second beam section to the installation side of the first beam section, arranging jacks at two ends of the bottom of the second beam section, detecting the jacking force of the jacks supporting the second beam section, and recording the jacking forces as P1 and P2; s3: installing a support pad at the bottom of the second beam section, unloading the jack and keeping the elevation of the second beam section after the jack is unloaded as the elevation in the state of the step S2; s4: welding and fixing the first beam section and the second beam section; s5: jacking the second beam section by using a jack, removing the support pad, and adjusting the jacking force of jacks at two ends to be P1 and P2; s6: measuring the elevation change X of the second beam section; s7: mounting a support pad at the bottom of the second beam section, and after the jacks at the two ends are unloaded, keeping the second beam section at the elevation in the state of the step S5; s8: welding a third beam section on one side of the second beam section, which is far away from the first beam section, according to the steps S1-S7, and carrying out positioning compensation on one end, which is far away from the second beam section, of the third beam section according to the elevation change X in S6 when the third beam section is installed; s9: and sequentially mounted to the nth beam segment as per step S8. Recording the load of the jack of the new beam section support before welding, and restoring the load of the jack of the new beam section support to the load before welding after welding; and then measuring elevation change, correcting when the next beam section is positioned, and performing compensation correction in advance to reduce installation errors.
Preferably, the welding seam shrinkage before and after the mounting support cushion is welded on the two adjacent beam sections is measured and is synchronously compared with the elevation change X for reference of mounting the rear beam section. And the two groups of data are subjected to reference comparison, so that the accuracy of the compensation data is further improved, and the construction error is reduced.
Preferably, the method comprises detecting the shrinkage of the welding seam between the top plates of two adjacent beam sections and the shrinkage of the welding seam between the two bottom plates.
Preferably, the jacks at the two ends are symmetrically arranged at the left side and the right side of the beam section. So that the jacks on the two sides are uniformly stressed.
Preferably, the number of the support pads is two, and the support pads are symmetrically arranged on the left side and the right side of the beam section. The stress is uniform, and the bearing beam section is convenient.
Preferably, the support pad is arranged between the jacks at the two ends.
Preferably, in step S6, the elevation change X is an elevation difference of the box girder of the second girder section with the jacking force of the girder bottom jacks being kept constant before and after welding.
Compared with the prior art, the beneficial effects of adopting the technical scheme are as follows: the invention discloses an all-welded elevation control method for a support section steel box girder, which comprises the following steps of: s1: setting the installed steel box girder as a first girder section, and sequentially setting girder sections to be installed as a second girder section, a third girder section and an Nth girder section according to the installation sequence; s2: erecting the second beam section to the installation side of the first beam section, arranging jacks at two ends of the bottom of the second beam section, detecting the jacking force of the jacks supporting the second beam section, and recording the jacking forces as P1 and P2; s3: installing a support pad at the bottom of the second beam section, unloading the jack and keeping the elevation of the second beam section after the jack is unloaded as the elevation in the state of the step S2; s4: welding and fixing the first beam section and the second beam section; s5: jacking the second beam section by using a jack, removing the support pad, and adjusting the jacking force of jacks at two ends to be P1 and P2; s6: measuring the elevation change X of the second beam section; s7: mounting a support pad at the bottom of the second beam section, and after the jacks at the two ends are unloaded, keeping the elevation of the second beam section as the height in the state of the step S5; s8: welding a third beam section on one side of the second beam section, which is far away from the first beam section, according to the steps S1-S7, and carrying out positioning compensation on one end, which is far away from the second beam section, of the third beam section according to the elevation change X in S6 when the third beam section is installed; s9: and sequentially mounted to the nth beam segment as per step S8. Recording the load of the jack of the new beam section support before welding, and restoring the load of the jack of the new beam section support to the load before welding after welding; and then measuring elevation change, correcting when the next beam section is positioned, and performing compensation correction in advance to reduce installation errors.
Drawings
FIG. 1 is a flow chart of a method of the present invention;
fig. 2 is a schematic structural diagram of the present invention.
Description of the symbols of the main elements: 1. a first beam section; 2. a second beam section; 3. a third beam section; 4. and (7) welding seams.
Detailed Description
The present invention will be described in detail below with reference to the accompanying drawings. In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Example 1: referring to fig. 1 and fig. 2, the method for controlling the all-welded elevation of the steel box girder of the bracket section of the embodiment includes the following steps: s1: setting the installed steel box girder as a first girder section 1, and sequentially setting girder sections to be installed as a second girder section 2, a third girder section 3 to an Nth girder section according to the installation sequence; s2: erecting a second beam section 2 to the installation side of the first beam section 1, arranging jacks at two ends of the bottom of the second beam section 2, detecting the jacking force of the jacks supporting the second beam section 2, and recording the jacking forces as P1 and P2; s3: installing a support pad at the bottom of the second beam section 2, unloading the jack and keeping the elevation of the second beam section 2 after the jack is unloaded as the elevation in the state of the step S2; s4: welding and fixing the first beam section 1 and the second beam section 2; s5: jacking the second beam section 2 by using a jack, removing the support pad, and adjusting the jacking force of jacks at two ends to be P1 and P2; s6: measuring the elevation change X of the second beam section 2; s7: installing a support pad at the bottom of the second beam section 2, and after the jacks at the two ends are unloaded, keeping the elevation of the second beam section 2 as the elevation in the state of the step S5; s8: welding a third beam section 3 on the side, away from the first beam section 1, of the second beam section 2 according to the steps S1-S7, and when the third beam section 3 is installed, performing positioning compensation on one end, away from the second beam section 2, of the third beam section 3 according to the elevation change X in S6; s9: and sequentially mounted to the nth beam segment as per step S8. Recording the load of the jack of the new beam section support before welding, and restoring the load of the jack of the new beam section support to the load before welding after welding; and then measuring elevation change, correcting when the next beam section is positioned, and performing compensation correction in advance to reduce installation errors.
Example 2: referring to fig. 1 and 2, in the present embodiment, the shrinkage of the weld joint 4 before and after the mounting of the support pad after welding of two adjacent beam sections is measured and compared with the elevation change X synchronously for reference of mounting of the rear beam section. And the two groups of data are subjected to reference comparison, so that the accuracy of the compensation data is further improved, and the construction error is reduced. The method comprises the step of detecting the shrinkage of the welding seam 4 between the top plates of two adjacent beam sections and the shrinkage of the welding seam 4 between two bottom plates. Jacks at two ends of the embodiment are symmetrically arranged at the left side and the right side of the beam section. So that the jacks on the two sides are uniformly stressed. The quantity of the bolster of this embodiment is two sets of, and the symmetry sets up the left and right sides at the roof beam section. The stress is uniform, and the bearing beam section is convenient. The support pad of this embodiment is disposed between the jacks at both ends. In step S6, the elevation change X is the height difference of the box girder when the jacking force of the bottom jacks of the second girder section is kept constant before and after welding. In this embodiment, because the length of the steel box girder is longer, the situation that two ends of the steel box girder are not equal in height inevitably occurs in the welding process, and along with the increase of the number of the installed beam sections, the height difference between the first beam section 1 and the nth beam section is obvious, and by the method, the error can be reduced through the elevation positioning compensation of the subsequent beam sections.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The support section steel box girder all-welded elevation control method is characterized by comprising the following steps of:
s1: setting the installed steel box girder as a first girder section, and sequentially setting girder sections to be installed as a second girder section, a third girder section and an Nth girder section according to the installation sequence;
s2: erecting the second beam section to the installation side of the first beam section, arranging jacks at two ends of the bottom of the second beam section, detecting the jacking force of the jacks supporting the second beam section, and recording the jacking forces as P1 and P2;
s3: installing a support pad at the bottom of the second beam section, unloading the jack and keeping the elevation of the second beam section after the jack is unloaded as the elevation in the state of the step S2;
s4: welding and fixing the first beam section and the second beam section;
s5: jacking the second beam section by using a jack, removing the support pad, and adjusting the jacking force of jacks at two ends to be P1 and P2;
s6: measuring the elevation change X of the second beam section, wherein the elevation change X is the elevation difference of the box beam of the second beam section under the condition that the jacking force of a beam bottom jack is kept unchanged before and after welding;
s7: mounting a support pad at the bottom of the second beam section, and after the jacks at the two ends are unloaded, keeping the elevation of the second beam section as the elevation in the state of the step S5;
s8: welding a third beam section on one side of the second beam section, which is far away from the first beam section, according to the steps S1-S7, and carrying out positioning compensation on one end, which is far away from the second beam section, of the third beam section according to the elevation change X in S6 when the third beam section is installed;
s9: and sequentially mounted to the nth beam segment as per step S8.
2. The all-welded elevation control method for the support section steel box girder according to claim 1, wherein the shrinkage of the weld joint before and after the support cushion is installed after the adjacent two girder sections are welded is measured and is synchronously compared with the elevation change X for reference of the installed rear girder section.
3. The all-welded elevation control method for the support section steel box girder according to claim 2, comprising the step of detecting the shrinkage of the weld between the top plates and the two bottom plates of the two adjacent girder sections.
4. The all-welded elevation control method for the support section steel box girder according to claim 1, wherein jacks at two ends are symmetrically arranged at the left side and the right side of the girder section.
5. The all-welded elevation control method for the support section steel box girder according to claim 4, wherein the number of the support cushions is two, and the support cushions are symmetrically arranged on the left side and the right side of the girder section.
6. The all-welded elevation control method for the support section steel box girder according to claim 5, wherein the support pad is arranged between the jacks at the two ends.
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| CN202110060789.XA CN112935635B (en) | 2021-01-18 | 2021-01-18 | Support section steel box girder all-welded elevation control method |
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| CN202110060789.XA CN112935635B (en) | 2021-01-18 | 2021-01-18 | Support section steel box girder all-welded elevation control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1052794A (en) * | 1996-08-12 | 1998-02-24 | Komai Tekko Inc | Assembling equipment of girder |
| DE102009001986A1 (en) * | 2009-03-30 | 2010-10-07 | Robert Bosch Gmbh | Welding process, welding device and composite part |
| CN101736700B (en) * | 2009-12-15 | 2011-05-04 | 中交路桥华北工程有限公司 | Construction method for hoisting broad width steel box girder cantilever |
| CN102433841B (en) * | 2011-12-28 | 2013-12-25 | 中铁二局股份有限公司 | Method for installing abnormal-shape curve steel box girder |
| CN102995910B (en) * | 2012-12-13 | 2015-02-18 | 北京创高铁研科技发展有限公司 | Control method for axis elevation of frame structure |
| CN105507155A (en) * | 2015-12-04 | 2016-04-20 | 上海市基础工程集团有限公司 | Construction process for installation of small-segment steel box girder |
| CN107345388B (en) * | 2017-06-19 | 2018-12-18 | 中交第二航务工程局有限公司 | Intelligent beam section matching installation control system |
| CN107245954B (en) * | 2017-07-28 | 2019-03-01 | 山西省交通科学研究院 | A kind of Mid and minor spans steel box girder bridge construction method |
| CN111926705A (en) * | 2020-05-08 | 2020-11-13 | 江苏中铁山桥重工有限公司 | Method for integrally assembling ultra-wide framing steel box girder |
| CN112084561B (en) * | 2020-09-11 | 2022-09-13 | 重庆交通大学 | Construction control method for long-span railway steel box composite beam bridge through incremental launching construction |
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