CN112935635A - Support section steel box girder all-welded elevation control method - Google Patents
Support section steel box girder all-welded elevation control method Download PDFInfo
- Publication number
- CN112935635A CN112935635A CN202110060789.XA CN202110060789A CN112935635A CN 112935635 A CN112935635 A CN 112935635A CN 202110060789 A CN202110060789 A CN 202110060789A CN 112935635 A CN112935635 A CN 112935635A
- Authority
- CN
- China
- Prior art keywords
- beam section
- section
- girder
- support
- elevation
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- 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
Abstract
The invention discloses an all-welded elevation control method for a support section steel box girder, which comprises the following steps of: s1: sequentially arranging a first beam section, a second beam section to an Nth beam 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 the bearing capacity as P1 and P2; s3: mounting a support pad at the bottom of the second beam section, unloading the jack and keeping the positioning elevation of the second beam section unchanged after the jack is unloaded; 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 X of the second beam section unchanged after the jacks at the two ends are unloaded; 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: and are sequentially mounted to the nth beam section.
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 diaphragm plate, a longitudinal diaphragm plate, 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 the first girder section, the 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 bearing capacity of the second beam section, and recording the bearing capacities as P1 and P2; s3: mounting a support pad at the bottom of the second beam section, unloading the jack and keeping the positioning elevation of the second beam section unchanged after the jack is unloaded; 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 X of the second beam section unchanged after the jacks at the two ends are unloaded; 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 the step 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, a height difference between upper surfaces of both ends of the second beam segment beam section is measured as the elevation change X.
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 the first girder section, the 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 bearing capacity of the second beam section, and recording the bearing capacities as P1 and P2; s3: mounting a support pad at the bottom of the second beam section, unloading the jack and keeping the positioning elevation of the second beam section unchanged after the jack is unloaded; 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 X of the second beam section unchanged after the jacks at the two ends are unloaded; 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 the step 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 the first girder section 2, a third girder section 3 to an Nth girder section according to the installation sequence; s2: erecting the 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 bearing capacity of the second beam section 2, and recording the bearing capacities as P1 and P2; s3: mounting a support pad at the bottom of the second beam section 2, unloading the jack and keeping the positioning elevation of the second beam section 2 unchanged after the jack is unloaded; 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: mounting a support pad at the bottom of the second beam section 2, and keeping the elevation X of the second beam section 2 unchanged after the jacks at the two ends are unloaded; s8: welding a third beam section 3 on one side of the second beam section 2 far away from the first beam section 1 according to the steps S1-S7, and when the third beam section 3 is installed, performing positioning compensation on one end, far away from the second beam section 2, of the third beam section 3 according to the elevation change X in the step 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, 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 of the present embodiment, the height difference between the upper surfaces of the two ends of the beam section of the second beam section 2 is measured as the elevation change X. In this embodiment, because the length of steel box girder is longer, the circumstances that two ends are not high enough can be seen in the welding process inevitably, along with the quantity of installation beam section becomes more, the difference in height of first beam section 1 and nth beam section will be very obvious, can reduce the error through the elevation positioning compensation of follow-up beam section through this method for all beam sections are whole to be in same water flat line.
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 (7)
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 the first girder section, the 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 bearing capacity of the second beam section, and recording the bearing capacities as P1 and P2;
s3: mounting a support pad at the bottom of the second beam section, unloading the jack and keeping the positioning elevation of the second beam section unchanged after the jack is unloaded;
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 X of the second beam section unchanged after the jacks at the two ends are unloaded;
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 the step 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.
7. The all-welded elevation control method for the support-section steel box girder according to claim 1, wherein in step S6, the height difference between the upper surfaces of the two ends of the second girder section is measured as the elevation change X.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110060789.XA CN112935635B (en) | 2021-01-18 | 2021-01-18 | Support section steel box girder all-welded elevation control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110060789.XA CN112935635B (en) | 2021-01-18 | 2021-01-18 | Support section steel box girder all-welded elevation control method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112935635A true CN112935635A (en) | 2021-06-11 |
| CN112935635B CN112935635B (en) | 2022-05-03 |
Family
ID=76235357
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110060789.XA Active CN112935635B (en) | 2021-01-18 | 2021-01-18 | Support section steel box girder all-welded elevation control method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112935635B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1052794A (en) * | 1996-08-12 | 1998-02-24 | Komai Tekko Inc | Assembling equipment of girder |
| CN101736700A (en) * | 2009-12-15 | 2010-06-16 | 中交路桥华北工程有限公司 | Construction method for hoisting broad width steel box girder cantilever |
| CN102369079A (en) * | 2009-03-30 | 2012-03-07 | 罗伯特·博世有限公司 | Welding method including welding device and assembly in accordance with a determined weld distortion |
| CN102433841A (en) * | 2011-12-28 | 2012-05-02 | 中铁二局股份有限公司 | Method for installing abnormal-shape curve steel box girder |
| CN102995910A (en) * | 2012-12-13 | 2013-03-27 | 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 |
| CN107245954A (en) * | 2017-07-28 | 2017-10-13 | 山西省交通科学研究院 | A kind of Mid and minor spans steel box girder bridge construction method |
| CN107345388A (en) * | 2017-06-19 | 2017-11-14 | 中交第二航务工程局有限公司 | Intelligent beam section Matching installation control system |
| 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 |
| CN112084561A (en) * | 2020-09-11 | 2020-12-15 | 重庆交通大学 | Construction control method for long-span railway steel box composite beam bridge through incremental launching construction |
-
2021
- 2021-01-18 CN CN202110060789.XA patent/CN112935635B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1052794A (en) * | 1996-08-12 | 1998-02-24 | Komai Tekko Inc | Assembling equipment of girder |
| CN102369079A (en) * | 2009-03-30 | 2012-03-07 | 罗伯特·博世有限公司 | Welding method including welding device and assembly in accordance with a determined weld distortion |
| CN101736700A (en) * | 2009-12-15 | 2010-06-16 | 中交路桥华北工程有限公司 | Construction method for hoisting broad width steel box girder cantilever |
| CN102433841A (en) * | 2011-12-28 | 2012-05-02 | 中铁二局股份有限公司 | Method for installing abnormal-shape curve steel box girder |
| CN102995910A (en) * | 2012-12-13 | 2013-03-27 | 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 |
| CN107345388A (en) * | 2017-06-19 | 2017-11-14 | 中交第二航务工程局有限公司 | Intelligent beam section Matching installation control system |
| CN107245954A (en) * | 2017-07-28 | 2017-10-13 | 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 |
| CN112084561A (en) * | 2020-09-11 | 2020-12-15 | 重庆交通大学 | Construction control method for long-span railway steel box composite beam bridge through incremental launching construction |
Non-Patent Citations (1)
| Title |
|---|
| 夏克俭: "宜昌长江公路大桥钢箱梁工地焊接施工精度控制", 《钢结构》 * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112935635B (en) | 2022-05-03 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN114888524B (en) | Arching method for large inner flange connection trestle | |
| CN105040567B (en) | Interchange steel bridge and manufacture method thereof | |
| CN111076918B (en) | Device and method for testing bearing capacity of composite board structure | |
| CN110777669A (en) | High-speed rail continuous beam short line matching prefabricated cantilever assembly line shape control method | |
| CN112554072A (en) | Assembling method for steel box girder of self-anchored suspension bridge | |
| CN111779286A (en) | Construction method for assembling planar truss on site | |
| CN112935635B (en) | Support section steel box girder all-welded elevation control method | |
| CN111441254A (en) | On-site pre-assembled jig frame for steel box girder bridge and installation method thereof | |
| CN213714202U (en) | Detection apparatus for big hinge joint damage between precast slab roof beam | |
| WO2020259469A1 (en) | Welded overhead line system hard cross beam and construction method therefor | |
| CN111475880B (en) | Method for setting pre-camber of deck type railway steel truss arch bridge | |
| CN112846554A (en) | Top plate unit assembly welding precision control method of ultra-wide steel box girder | |
| CN113073569B (en) | Method for correcting integral torsional deformation of steel box girder bridge section | |
| CN108625296B (en) | Installation linear control method for segmental precast bridge | |
| CN110886184A (en) | Device and method for reducing accurate matching additional stress of wide steel box girder of cable-stayed bridge | |
| US20230222260A1 (en) | Method for calculating bending moment resistance of internal unbonded post-tensioned composite beam with corrugated steel webs (csws) and double-concrete-filled steel tube (cfst) lower flange | |
| CN211553572U (en) | Testing device for detecting bearing capacity of reinforced concrete precast beam | |
| CN113481835A (en) | Stable bridge tower pier based on complex pier beam and manufacturing process thereof | |
| CN111896363A (en) | Method for carrying out single-beam destructive load test by using original bridge span structure | |
| CN111982677A (en) | Initial effective prestress field detection method for prestressed concrete frame structure | |
| CN208350256U (en) | Longitudinal diamond shape load test structure of high-precision force-measuring framework | |
| CN115060573B (en) | Loading test device and method for hogging moment area of steel plate composite beam | |
| CN109341990A (en) | The experiment loading device and its loading method of steel box girder under distortion load | |
| CN114922097B (en) | Reinforcing transformation method for changing line shape of continuous girder bridge of existing steel box girder | |
| CN214251442U (en) | Experimental device capable of evaluating overall performance of continuous bridge deck |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |