CN114351595A - Prestressed concrete box girder transportation method - Google Patents
Prestressed concrete box girder transportation method Download PDFInfo
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- CN114351595A CN114351595A CN202111676987.5A CN202111676987A CN114351595A CN 114351595 A CN114351595 A CN 114351595A CN 202111676987 A CN202111676987 A CN 202111676987A CN 114351595 A CN114351595 A CN 114351595A
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- prestressed concrete
- box girder
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 85
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000009826 distribution Methods 0.000 claims abstract description 25
- 238000006073 displacement reaction Methods 0.000 claims abstract description 20
- 241001669679 Eleotris Species 0.000 claims abstract description 9
- 230000007246 mechanism Effects 0.000 claims abstract description 7
- 230000008569 process Effects 0.000 claims description 11
- 238000012360 testing method Methods 0.000 claims description 7
- 238000003860 storage Methods 0.000 claims description 6
- 238000005336 cracking Methods 0.000 abstract description 4
- 230000006872 improvement Effects 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 5
- 239000004567 concrete Substances 0.000 description 5
- 238000010276 construction Methods 0.000 description 5
- 238000004364 calculation method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000009417 prefabrication Methods 0.000 description 3
- 230000002411 adverse Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention provides a prestressed concrete box girder transportation method, which comprises the following steps: step S1, arranging a transportation platform below the prestressed concrete box girder to be transported to enter an arrangement space; step S2, determining the stress position of the support and the position of the key section; step S3, a plurality of SPMTs corresponding to the bearing capacity are set; step S4, arranging a plurality of distributing beams on the SPMT; step S5, opening the SPMT with the erected distribution beam to the bottom of the prestressed concrete box beam; step S6, setting wedge-shaped sleepers on the distribution beams; step S7, knocking two ends of the wedge-shaped sleeper; step S8, attaching a strain gage and an electric measuring displacement meter to the prestressed concrete box girder; s9, jacking the prestressed concrete box girder by the SPMT through a lifting mechanism to separate the prestressed concrete box girder from an original supporting position; and step S10, controlling the SPMT to move to the pre-loading position. The invention has stable transportation and avoids the damage of the box girder such as cracking and the like.
Description
Technical Field
The invention relates to the field of bridge construction, in particular to a prestressed concrete box girder transportation method.
Background
The conventional prestressed concrete bridge is mostly transported and rolled by using a large portal crane, an air bag, a slide way and the like after installation and cast-in-place or prefabrication in a prefabrication field, the efficiency is low, the labor intensity is high, in order to complete the transportation, the prefabricated area, the weight and the size of a prefabricated box girder are greatly limited, the requirement of the current bridge construction large-scale modular construction is not met, the current situation and the material characteristic of large-scale prefabrication of the concrete box girder are urgently needed, and a flexible and stable transportation method with strong bearing capacity, high efficiency is invented to complete the site transportation and rolling and refuting construction of the large prestressed concrete box girder.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a prestressed concrete box girder transportation method.
The invention provides a prestressed concrete box girder transportation method, which comprises the following steps:
step S1, arranging a transportation platform below the prestressed concrete box girder to be transported to enter an arrangement space;
step S2, determining the position of the prestressed concrete box girder, which allows supporting stress and the position of the key section when the prestressed concrete box girder is loaded and transported, according to the design parameters;
step S3, a plurality of SPMTs (self-propelled hydraulic module vehicles) corresponding to bearing capacity are set according to the weight of the prestressed concrete box girder, and are arranged according to the supporting stress position of the prestressed concrete box girder;
step S4, erecting a plurality of distribution beams on the SPMT according to the supporting and stressing positions of the prestressed concrete box girder;
step S5, opening the SPMT with the erected distribution beam to the position where the transportation platform at the bottom of the prestressed concrete box girder enters the arrangement space and aligns to the support stress position of the prestressed concrete box girder;
step S6, erecting wedge-shaped sleepers on the distribution beams, wherein the sleepers are erected on two sides right below the positions of the web plates of the prestressed concrete box girder;
step S7, knocking the two ends of the wedge-shaped sleeper to enable the wedge-shaped sleeper to tightly plug the space between the distribution beam and the prestressed concrete box beam;
step S8, attaching strain gauges connected with a strain test system to the upper part and the lower part of the critical section of the prestressed concrete box girder, and installing an electrical displacement meter at the bottom of the critical section of the prestressed concrete box girder;
s9, jacking the prestressed concrete box girder by the SPMT through a lifting mechanism to separate the prestressed concrete box girder from an original supporting position;
and S10, controlling the SPMT to move to a preassembly position, and controlling a lifting mechanism of the SPMT to descend to the top surface of the beam storage buttress until the total weight of the prestressed concrete box beam is borne by the beam storage buttress.
As a further improvement of the present invention, in step S6, a first rubber cushion layer is laid on the upper end of the wedge-shaped sleeper.
As a further improvement of the present invention, in step S4, a second rubber cushion layer is laid on the SPMT when the distribution beam is erected.
As a further improvement of the present invention, in step S9, during the SPMT jacking the prestressed concrete box girder, the strain test system detects the stress variation of the prestressed concrete box girder in real time, and the electrical displacement gauge monitors the displacement variation of the prestressed concrete box girder in real time, and once the displacement exceeds a predetermined range, the jacking angle is adjusted or the jacking is stopped.
As a further improvement of the present invention, in step S3, the plurality of SPMTs are divided into two groups and disposed at front and rear ends of the prestressed concrete box girder, the SPMTs in each group are disposed in parallel, the two groups of SPMTs are disposed in a horizontal direction or in a vertical direction, and in step S4, the plurality of distribution girders are disposed in a horizontal direction on the SPMTs.
The invention has the beneficial effects that: the SPMT is used as a transport vehicle, has multiple modes of walking functions and strong bearing capacity, has small turning radius, is flexible and stable, is beneficial to transferring and accurate placement in a narrow field, and the hydraulic suspension system can keep the cargo bed horizontal on an undulating road surface and is beneficial to the stability of a concrete box girder in the transport process; the number and the arrangement mode of the vehicle groups of the SPMT can be flexibly adjusted according to the weight, the size and the field conditions of the prestressed concrete box girder, the stress position and the key section position of the box girder are determined according to the design parameters of the prestressed concrete box girder, the distribution girder and the sleepers are arranged at the support stress position for bearing, and the strain gauge and the electric displacement gauge are arranged at the key section position for monitoring the stress and the displacement, so that the adverse states of the box girder, such as inclination, torsion, overlarge stress and the like can be timely found and corrected, the concrete stress value of the box girder in the whole loading and transportation process is ensured to be within the standard allowable range, and the damage of the box girder structure, such as cracking, compression damage and the like can be avoided.
Drawings
FIG. 1 is a block flow diagram of a method of transporting a prestressed concrete box girder according to the present invention;
FIG. 2 is a schematic view of a carrying structure of a transportation platform of the transportation method of the prestressed concrete box girder of the present invention;
FIG. 3 is an enlarged schematic view of a portion of the structure of FIG. 2;
FIG. 4 is a schematic view of the structure of FIG. 2 from another angle;
FIG. 5 is a schematic diagram of the strain gage arrangements at 1-1 and 2-2 of FIG. 1;
FIG. 6 is a schematic diagram of the strain gage arrangements at 3-3 and 4-4 of FIG. 1;
FIG. 7 is a schematic diagram of the arrangement of the electrical displacement gauges at 1-1, 2-2, 3-3 and 4-4 of FIG. 1.
Reference numerals: 1-SPMT; 2-a distribution beam; 3-wedge sleeper; 41-a first rubber cushion layer; 42-a second rubber cushion layer; 5-prestressed concrete box girder; 6-strain gauge; 7-electric measuring displacement meter.
Detailed Description
As shown in fig. 1 to 7, the present invention discloses a prestressed concrete box girder transporting method, comprising the steps of:
step S1, arranging a transportation platform entering arrangement space below the prestressed concrete box girder 5 to be transported, wherein the transportation platform entering the arrangement space can be reserved at the bottom when the prestressed concrete box girder 5 is prefabricated;
step S2, determining a position allowing support stress and a key section position when the prestressed concrete box girder 5 is loaded and transported according to design parameters, wherein the position allowing support stress and the key section position can be subjected to modeling analysis according to the structural size, reinforcement condition and construction process planned by a design file to calculate a stress result, the modeling calculation comprises stress calculation of the prestressed concrete box girder 5 in the loading and transporting process and the final state, and the specific calculation mode is a conventional algorithm of a person skilled in the art;
step S3, a plurality of SPMT1 (self-propelled hydraulic module vehicles) corresponding to bearing capacity are arranged according to the weight of the prestressed concrete box girder 5, a plurality of SPMT1 are arranged and combined, and the SPMT1 and the SPMT1 are arranged according to the supporting and stressed positions of the prestressed concrete box girder 5;
step S4, erecting a plurality of distribution beams 2 on the SPMT1 according to the supporting and stressing positions of the prestressed concrete box girders 5, bearing the load of the prestressed concrete box girders 5 and transmitting the load to all SPMT1 vehicle groups;
step S5, opening the SPMT1 provided with the distribution beam 2 to the position where the transportation platform at the bottom of the prestressed concrete box girder 5 enters the arrangement space and aligns to the support stress position of the prestressed concrete box girder 5;
step S6, erecting wedge-shaped sleepers 3 on the distribution beams 2, wherein the sleepers are erected on two sides right below the positions of the webs of the prestressed concrete box girders 5;
step S7, knocking the two ends of the wedge-shaped sleepers 3 to enable the wedge-shaped sleepers 3 to tightly plug the space between the distribution beam 2 and the prestressed concrete box girder 5, and ensuring that each supporting point is uniformly stressed;
step S8, attaching strain gauges 6 connected with a strain test system to the upper part and the lower part of the critical section position of the prestressed concrete box girder 5, wherein the dynamic and static strain test system can monitor the stress change of the box girder in the loading and transportation process in real time through the strain gauges 6 attached to the surface of the box girder, and sends out an alarm before exceeding the standard limit value so as to avoid the box girder from cracking and compressive damage caused by overlarge stress, and an electrical displacement meter 7 is arranged at the bottom of a plurality of critical section positions with large relative deformation of the prestressed concrete box girder 5 so as to monitor the relative displacement of the box girder in the loading process and avoid the unfavorable conditions of torsion and the like of the box girder in the loading process;
s9, jacking the prestressed concrete box girder 5 by the SPMT1 through a lifting mechanism to enable the prestressed concrete box girder to be separated from an original supporting position;
and S10, controlling the SPMT1 to move to a pre-installation position, and controlling the lifting mechanism of the SPMT1 to descend to the top surface of the beam storage buttress until the whole weight of the prestressed concrete box girder 5 is borne by the beam storage buttress.
As a further improvement of the present invention, in step S6, a first rubber cushion layer 41 is laid on the upper end of the wedge sleeper 3 to play a role in anti-skid and buffer protection.
As a further improvement of the present invention, in step S4, a second rubber cushion 42 is laid on the SPMT1 when the distribution beam 2 is erected, so as to play a role of anti-skid and buffer protection.
As a further improvement of the present invention, in step S9, during the process of jacking the prestressed concrete box girder 5 by using the SPMT1, the stress variation of the prestressed concrete box girder 5 is detected in real time by using the strain testing system, the displacement variation of the prestressed concrete box girder 5 is monitored in real time by using the electrical displacement meter 7, and once the displacement variation exceeds a predetermined range, the jacking angle is adjusted or the jacking is stopped.
As a further improvement of the present invention, in step S3, the plurality of SPMTs 1 are divided into two groups and disposed at the front and rear ends of the prestressed concrete box girder 5, the SPMTs 1 in each group are disposed in parallel, the two groups of SPMTs 1 are disposed transversely or longitudinally, in step S4, the plurality of distribution girders 2 are disposed transversely on the SPMT1, and the SPMT1 can distribute different numbers of axes to the distribution girders 2 erected above the distribution girders in different arrangement modes to provide different support forces, so that the stress of the box girders during loading and transportation can be as favorable as possible by combining calculation and analysis, and the stress value thereof is within the allowable range of the specification.
The SPMT1 is used as a transport vehicle, has multiple modes of walking function and strong bearing capacity, has small turning radius, is flexible and stable, is beneficial to transferring and accurate placement in narrow places, and the hydraulic suspension system can keep the cargo bed horizontal on the undulating road surface and is beneficial to the stability of the concrete box girder in the transport process; the number and the arrangement mode of the vehicle groups of the SPMT1 can be flexibly adjusted according to the weight, the size and the field conditions of the prestressed concrete box girder 5, the stress position and the key section position of the box girder are determined according to the design parameters of the prestressed concrete box girder 5, the distribution girder 2 and the sleepers are arranged at the supporting stress position for bearing, and the strain gauge 6 and the electric measuring displacement meter 7 are arranged at the key section position for monitoring the stress and the displacement, so that the adverse states of the box girder, such as inclination, torsion, overlarge stress and the like, can be timely found and corrected, the concrete stress value of the box girder is ensured to be within the standard allowable range in the whole loading and transportation process, and the damage of the box girder structure, such as cracking, compression damage and the like can be avoided.
The foregoing is a more detailed description of the invention in connection with specific preferred embodiments and it is not intended that the invention be limited to these specific details. For those skilled in the art to which the invention pertains, several simple deductions or substitutions can be made without departing from the spirit of the invention, and all shall be considered as belonging to the protection scope of the invention.
Claims (5)
1. The method for transporting the prestressed concrete box girder is characterized by comprising the following steps of:
step S1, arranging a transportation platform below the prestressed concrete box girder to be transported to enter an arrangement space;
step S2, determining the position of the prestressed concrete box girder, which allows supporting stress and the position of the key section when the prestressed concrete box girder is loaded and transported, according to the design parameters;
step S3, a plurality of SPMTs corresponding to bearing capacity are set according to the weight of the prestressed concrete box girder and are arranged according to the support stress position of the prestressed concrete box girder;
step S4, erecting a plurality of distribution beams on the SPMT according to the supporting and stressing positions of the prestressed concrete box girder;
step S5, opening the SPMT with the erected distribution beam to the position where the transportation platform at the bottom of the prestressed concrete box girder enters the arrangement space and aligns to the support stress position of the prestressed concrete box girder;
step S6, erecting wedge-shaped sleepers on the distribution beams, wherein the sleepers are erected on two sides right below the positions of the web plates of the prestressed concrete box girder;
step S7, knocking the two ends of the wedge-shaped sleeper to enable the wedge-shaped sleeper to tightly plug the space between the distribution beam and the prestressed concrete box beam;
step S8, attaching strain gauges connected with a strain test system to the upper part and the lower part of the critical section of the prestressed concrete box girder, and installing an electrical displacement meter at the bottom of the critical section of the prestressed concrete box girder;
s9, jacking the prestressed concrete box girder by the SPMT through a lifting mechanism to separate the prestressed concrete box girder from an original supporting position;
and S10, controlling the SPMT to move to a preassembly position, and controlling a lifting mechanism of the SPMT to descend to the top surface of the beam storage buttress until the total weight of the prestressed concrete box beam is borne by the beam storage buttress.
2. The prestressed concrete box girder transporting method according to claim 1, wherein: in step S6, a first rubber cushion layer is laid on the upper end of the wedge sleeper.
3. The prestressed concrete box girder transporting method according to claim 1, wherein: in step S4, a second rubber cushion layer is laid on the SPMT when the distribution beam is erected.
4. The prestressed concrete box girder transporting method according to claim 1, wherein: in the step S9, in the process of jacking the prestressed concrete box girder by the SPMT, the stress variation of the prestressed concrete box girder is detected in real time by the strain test system, the displacement variation of the prestressed concrete box girder is monitored in real time by the electrical displacement meter, and once the displacement variation exceeds a predetermined range, the jacking angle is adjusted or the jacking is stopped.
5. The prestressed concrete box girder transporting method according to claim 1, wherein: in step S3, the SPMTs are divided into two groups and disposed at front and rear ends of the prestressed concrete box girder, the SPMTs in each group are disposed in parallel, the two groups of SPMTs are disposed horizontally or longitudinally, and in step S4, the plurality of distribution girders are disposed horizontally on the SPMTs.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111676987.5A CN114351595A (en) | 2021-12-31 | 2021-12-31 | Prestressed concrete box girder transportation method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111676987.5A CN114351595A (en) | 2021-12-31 | 2021-12-31 | Prestressed concrete box girder transportation method |
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| CN114351595A true CN114351595A (en) | 2022-04-15 |
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| CN202111676987.5A Pending CN114351595A (en) | 2021-12-31 | 2021-12-31 | Prestressed concrete box girder transportation method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125853A (en) * | 2022-07-04 | 2022-09-30 | 中铁十四局集团青岛工程有限公司 | Beam mounting tool and beam mounting method |
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|---|---|---|---|---|
| KR101134290B1 (en) * | 2011-03-08 | 2012-04-13 | (주)삼현피에프 | Method of constructing prestressed concrete box girder bridge |
| CN108505445A (en) * | 2018-04-16 | 2018-09-07 | 中铁二局集团有限公司 | A kind of overbridge roof beam structure bridge construction method |
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| CN111827131A (en) * | 2020-06-29 | 2020-10-27 | 中铁广州工程局集团有限公司 | Construction method for accurately positioning steel box girder arranged on module frame |
| CN212073848U (en) * | 2020-05-13 | 2020-12-04 | 中国建筑一局(集团)有限公司 | Precast beam transport vechicle system with automatically regulated function |
| CN112081012A (en) * | 2020-09-04 | 2020-12-15 | 中交第四航务工程局有限公司 | Jacking and transporting method for large prestressed concrete precast box girder |
| CN214295745U (en) * | 2020-12-22 | 2021-09-28 | 中建五局土木工程有限公司 | PC track beam transportation and installation device and PC track beam transport vehicle |
| CN113459937A (en) * | 2021-06-16 | 2021-10-01 | 五冶集团上海有限公司 | Reinforcing device for automobile transportation of steel box girder and transportation method |
-
2021
- 2021-12-31 CN CN202111676987.5A patent/CN114351595A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101134290B1 (en) * | 2011-03-08 | 2012-04-13 | (주)삼현피에프 | Method of constructing prestressed concrete box girder bridge |
| CN108505445A (en) * | 2018-04-16 | 2018-09-07 | 中铁二局集团有限公司 | A kind of overbridge roof beam structure bridge construction method |
| CN110306435A (en) * | 2019-06-11 | 2019-10-08 | 中国建筑第六工程局有限公司 | A kind of super large segmentation more ship through transport construction methods of steel structure bridge |
| CN212073848U (en) * | 2020-05-13 | 2020-12-04 | 中国建筑一局(集团)有限公司 | Precast beam transport vechicle system with automatically regulated function |
| CN111827131A (en) * | 2020-06-29 | 2020-10-27 | 中铁广州工程局集团有限公司 | Construction method for accurately positioning steel box girder arranged on module frame |
| CN112081012A (en) * | 2020-09-04 | 2020-12-15 | 中交第四航务工程局有限公司 | Jacking and transporting method for large prestressed concrete precast box girder |
| CN214295745U (en) * | 2020-12-22 | 2021-09-28 | 中建五局土木工程有限公司 | PC track beam transportation and installation device and PC track beam transport vehicle |
| CN113459937A (en) * | 2021-06-16 | 2021-10-01 | 五冶集团上海有限公司 | Reinforcing device for automobile transportation of steel box girder and transportation method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115125853A (en) * | 2022-07-04 | 2022-09-30 | 中铁十四局集团青岛工程有限公司 | Beam mounting tool and beam mounting method |
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