CN109267488B - Method for preloading segment girder bridge fabrication machine by utilizing dynamic concentrated load - Google Patents
Method for preloading segment girder bridge fabrication machine by utilizing dynamic concentrated load Download PDFInfo
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- CN109267488B CN109267488B CN201811201483.6A CN201811201483A CN109267488B CN 109267488 B CN109267488 B CN 109267488B CN 201811201483 A CN201811201483 A CN 201811201483A CN 109267488 B CN109267488 B CN 109267488B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 14
- 238000012544 monitoring process Methods 0.000 claims abstract description 9
- 238000003825 pressing Methods 0.000 claims abstract description 9
- 238000010276 construction Methods 0.000 abstract description 11
- 230000005489 elastic deformation Effects 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 238000010008 shearing Methods 0.000 description 2
- 238000004458 analytical method Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M5/00—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings
- G01M5/0008—Investigating the elasticity of structures, e.g. deflection of bridges or air-craft wings of bridges
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/06—Power analysis or power optimisation
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Abstract
The invention discloses a method for preloading a segment girder bridge fabrication machine by utilizing dynamic concentrated loads, which comprises the steps of firstly calculating the weight of the dynamic concentrated loads, and selecting a preloaded girder segment for providing the concentrated loads; assembling the movable support bridge fabrication machine, and moving the movable support bridge fabrication machine forwards to a first hole to-be-erected hole position; then, sequentially suspending all sections of the first-hole box girder on a bridge fabrication machine; hoisting the pre-pressed beam section to a bridge fabrication machine, dividing the beam length into n sections, monitoring and measuring the deflection and the stress measuring point of the key section after the pre-pressed beam section moves for one section and the deformation is stable, and analyzing the rigidity and the strength of the structure at the moment; and finally, all sections of the pre-pressed beam section and the first hole box beam are unloaded, after the deformation is stable, the deflection of each control section and the stress measuring point of the key section are measured, and the data are analyzed. The invention not only can greatly improve the construction efficiency of loading and unloading in the pre-pressing process of the bridge fabrication machine, but also greatly reduces the construction investment, and can also reduce various construction risks in the prior pre-pressing process.
Description
Technical Field
The invention relates to the technical field of railway modification, in particular to a method for prepressing a segment girder bridge fabrication machine by utilizing dynamic concentrated load.
Background
With the requirements of the national security supervision department and the railway industry on the bearing capacity, the design rigidity and the stability of large equipment and the higher and higher safe operation conditions, more and more mobile support bridge fabrication machines appear on the current construction site, but the mobile support bridge fabrication machines cannot be divided into special equipment, and no national function is available for detection. A convenient, quick and low-cost detection method must be found to detect the existing bridge fabrication machine to ensure the safety and reliability of construction.
The accurate measurement of the elastic deformation and the inelastic deformation of the movable support directly controls the assembly precision of the beam body, and the assembly precision must be determined through precompression measurement calculation.
Disclosure of Invention
In view of the above problems, the present invention provides a method for preloading a segmental girder bridge fabrication machine by using dynamic concentrated load, which can realize rapid, precise and synchronous load application and unloading, equivalently eliminate the inelastic deformation of a bracket, and obtain the elastic deformation of the bracket. The technical scheme is as follows:
a method for preloading a segment girder bridge fabrication machine by utilizing dynamic concentrated load comprises the following steps:
step 1: calculating the weight of the dynamic concentrated load, and selecting a pre-pressed beam section for providing the concentrated load;
step 2: assembling the movable support bridge fabrication machine, and moving the movable support bridge fabrication machine forwards to a first hole to-be-erected hole position;
and step 3: sequentially suspending each section of the first-hole box girder on a bridge fabrication machine until all sections are suspended;
and 4, step 4: evenly dividing n measuring sections on the section beam bridge fabrication machine;
and 5: hoisting the pre-pressed beam section to a bridge fabrication machine, moving to the position with the length of 1/n beam, monitoring and measuring the span-middle deflection value, the section stress measuring point at the joint of the beam end and the n-1 measuring sections after the deformation is stable, and analyzing the rigidity and the strength of the structure at the moment;
step 6: sequentially moving the pre-pressed beam section to the length of 2/n, … … (n-1)/n beams, monitoring and measuring the span center deflection value, the beam end and the section stress measuring point at the joint of n-1 measuring sections after each row reaches one position to be deformed stably, and analyzing the rigidity and the strength of the structure at the moment;
and 7: and (3) completely unloading all sections of the pre-pressed beam section and the first-hole box beam, monitoring and measuring a cross-center deflection value, a beam end and a section stress measuring point at the joint of the n-1 measuring sections after the pre-pressed beam section and the first-hole box beam are deformed stably, and analyzing the rigidity and the strength of the structure at the moment.
Further, the mobile stent bridging machine adopts a TPZ80/2500 model.
Furthermore, the first-hole box girder is 13 sections.
Further, the measuring section is 4 sections.
The invention has the beneficial effects that: the invention adopts the bridge fabrication machine to hoist a beam section to move on the bridge fabrication machine to provide concentrated load instead of uniformly distributed load, can eliminate the inelastic deformation of the bracket and achieve the purpose of elastic deformation of the bracket, not only can greatly improve the construction efficiency of loading and unloading in the pre-pressing process of the bridge fabrication machine, but also greatly reduces the construction investment and can also reduce various construction risks in the pre-pressing process in the past.
Drawings
Fig. 1 is a schematic diagram of a bridge fabrication machine.
Fig. 2 is a schematic view of a beam section completely suspended on a bridge fabrication machine.
Fig. 3 is a schematic view of the pre-stressed beam section moving to 1/4 beam lengths.
Fig. 4 is a schematic view of the pre-stressed beam section moving to 1/2 beam lengths.
Detailed Description
The invention is described in further detail below with reference to the figures and specific embodiments. The invention is suitable for the prepressing operation of the bridge fabrication machine, wherein the movable support bridge fabrication machine is positioned above the concrete main beam, and the beam conveying trolley can carry the beam section to freely walk on the movable support. The construction steps are as follows:
the first step is as follows: calculating the weight of the dynamic concentrated load, and selecting a beam section (hereinafter referred to as a pre-pressed beam section) providing the concentrated load.
The second step is that: as shown in figure 1, the TPZ80/2500 type mobile stent bridging machine is assembled and moved forward to the position of the first hole to be erected.
The third step: and successively suspending the 13 sections of the first box girder on the bridge fabrication machine until all the sections are suspended. As shown in fig. 2.
The fourth step: and hoisting the pre-pressed beam section to the bridge fabrication machine and moving to the L/4 position, as shown in figure 3. After the deformation is stable, the deflection and stress measuring points of key sections (such as beam ends and sections at 1/4, 1/2 and 3/4) are monitored and measured, and the rigidity and the strength of the structure at the moment are analyzed.
The fifth step: the pre-pressed beam section moves to the L/2 position, as shown in figure 4. And after the deformation is stable, monitoring and measuring the deflection and the stress measuring point of the key section and analyzing the rigidity and the strength of the structure at the moment.
And a sixth step: and (3) moving the pre-pressed beam section to a 3L/4 position, monitoring and measuring deflection and a key section stress measuring point after the deformation is stable, and analyzing the rigidity and the strength of the structure at the moment.
The seventh step: and (3) completely unloading the 13 sections of the pre-pressed beam section and the first hole beam, measuring the deflection of each control section and the stress measuring point of the key section after the deformation is stable, and analyzing the data. The control cross-sections selected in this example are 1/4, 1/2, 3/4 beam lengths.
Finally, the measured values of the obtained measurement data, the analysis results and the like are compared with the theoretical values of modeling calculation, and the safety of each stress rod piece of the bridge fabrication machine is analyzed.
Analyzing the working principle: and pre-pressing the movable support by not less than 1.1 times of the maximum construction load before assembling and erecting the beam body for the first time according to the standard. The load of the bridge crane is determined to be G and the pre-pressing load is determined to be G through accurate calculation when the bridge crane is fully loaded (after the whole hole beam section is completely suspended)0Assuming that 1.1 × G, then theoretically a uniform load of 0.1 × G would need to be applied, then the uniform load q is:
span bending moment M with uniformly distributed load acting on bridge fabrication machine1Comprises the following steps:
when a bridge fabrication machine overhead crane is used for hoisting a beam section (the weight N is more than or equal to 0.1 × G) to a midspan position, a midspan bending moment M is generated2Comprises the following steps:
obviously, M2＞M1And the shearing force of the beam section and the midspan shearing force are the same in the two pre-pressing modes. That is to say, it is completely feasible that the bridge fabrication machine hoists a beam section to move on the bridge fabrication machine to provide concentrated load instead of uniformly distributed load prepressing.
In the construction, the uniform load is generally applied by adopting a prepressing block weight pressing mode, the work efficiency is very low, if a bridge fabrication machine is adopted to hoist a beam section to move on the bridge fabrication machine to provide concentrated load to replace the uniform load, the aim of eliminating the inelastic deformation of the support and obtaining the elastic deformation of the support can be achieved, and the prepressing is very efficient.
Claims (4)
1. A method for preloading a segment girder bridge fabrication machine by utilizing dynamic concentrated load is characterized by comprising the following steps:
step 1: calculating the weight of the dynamic concentrated load, and selecting a pre-pressed beam section for providing the concentrated load;
step 2: assembling the movable support bridge fabrication machine, and moving the movable support bridge fabrication machine forwards to a first hole to-be-erected hole position;
and step 3: sequentially suspending each section of the first-hole box girder on a bridge fabrication machine until all sections are suspended;
and 4, step 4: evenly dividing n measuring sections on the section beam bridge fabrication machine;
and 5: hoisting the pre-pressed beam section to a bridge fabrication machine, moving to the position with the length of 1/n beam, monitoring and measuring the span-middle deflection value, the section stress measuring point at the joint of the beam end and the n-1 measuring sections after the deformation is stable, and analyzing the rigidity and the strength of the structure at the moment;
step 6: sequentially moving the pre-pressed beam section to the length of 2/n, … … (n-1)/n beams, monitoring and measuring the span center deflection value, the beam end and the section stress measuring point at the joint of n-1 measuring sections after each row reaches one position to be deformed stably, and analyzing the rigidity and the strength of the structure at the moment;
and 7: and (3) completely unloading all sections of the pre-pressed beam section and the first-hole box beam, monitoring and measuring a cross-center deflection value, a beam end and a section stress measuring point at the joint of the n-1 measuring sections after the pre-pressed beam section and the first-hole box beam are deformed stably, and analyzing the rigidity and the strength of the structure at the moment.
2. The method for pre-pressing a segmental beam bridge fabrication machine with dynamic concentrated loads according to claim 1, wherein the mobile scaffold bridge fabrication machine is of the TPZ80/2500 type.
3. The method for utilizing a dynamic concentrated load preloading segment girder bridge fabrication machine according to claim 1, wherein the first box girder is 13 segments.
4. The method for preloading a segment girder bridge fabrication machine with dynamic concentrated loads according to claim 1, wherein the measuring section is 4 sections.
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080083374A (en) * | 2007-03-12 | 2008-09-18 | (주)삼현피에프 | Prestressed temporary bridge preloaded by cable-tie and method thereof |
| CN102704401A (en) * | 2012-05-28 | 2012-10-03 | 宁波二十冶建设有限公司 | Multizone pre-pressing technology for full framing |
| CN102912738A (en) * | 2012-11-07 | 2013-02-06 | 北京市公路桥梁建设集团有限公司 | Overall prepressing device for hanging basket |
| CN103628422A (en) * | 2013-10-30 | 2014-03-12 | 中建三局建设工程股份有限公司 | Counter-force type stay rope hanging basket prepressing device and implement method thereof |
| CN107905109A (en) * | 2017-11-21 | 2018-04-13 | 重庆建工市政交通工程有限责任公司 | The loads such as the cast-in-place platform simulation of great-leap-forward bridge are segmented precompressed construction method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205046487U (en) * | 2015-10-08 | 2016-02-24 | 武汉一冶建筑安装工程有限责任公司 | Pre -compaction device of bath formula bridge rubber raft |
| CN205741926U (en) * | 2016-05-22 | 2016-11-30 | 中交第一航务工程局有限公司 | Stretch-draw prepressing device in Cast-in-situ Beam steel pipe beret truss platform |
| CN207273465U (en) * | 2017-10-19 | 2018-04-27 | 阚方义 | A kind of 500t bilayer preformers for Wood-based Panel Production industry |
| CN108344546B (en) * | 2018-04-19 | 2024-02-27 | 杭州中能透平机械装备股份有限公司 | Deflection test device and method for steam turbine partition plate |
-
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- 2018-10-16 CN CN201811201483.6A patent/CN109267488B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20080083374A (en) * | 2007-03-12 | 2008-09-18 | (주)삼현피에프 | Prestressed temporary bridge preloaded by cable-tie and method thereof |
| CN102704401A (en) * | 2012-05-28 | 2012-10-03 | 宁波二十冶建设有限公司 | Multizone pre-pressing technology for full framing |
| CN102912738A (en) * | 2012-11-07 | 2013-02-06 | 北京市公路桥梁建设集团有限公司 | Overall prepressing device for hanging basket |
| CN103628422A (en) * | 2013-10-30 | 2014-03-12 | 中建三局建设工程股份有限公司 | Counter-force type stay rope hanging basket prepressing device and implement method thereof |
| CN107905109A (en) * | 2017-11-21 | 2018-04-13 | 重庆建工市政交通工程有限责任公司 | The loads such as the cast-in-place platform simulation of great-leap-forward bridge are segmented precompressed construction method |
Non-Patent Citations (1)
| Title |
|---|
| 48m节段预制拼装箱梁架桥机弹性恢复的病害防治;余金江;《铁道建筑技术》;20170520;第49页-第52页、第56页 * |
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