CN111851294A - Simply supported box girder falling alignment device and application method thereof - Google Patents
Simply supported box girder falling alignment device and application method thereof Download PDFInfo
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- CN111851294A CN111851294A CN201910335198.1A CN201910335198A CN111851294A CN 111851294 A CN111851294 A CN 111851294A CN 201910335198 A CN201910335198 A CN 201910335198A CN 111851294 A CN111851294 A CN 111851294A
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- 238000013461 design Methods 0.000 claims abstract description 5
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- 238000012544 monitoring process Methods 0.000 claims description 31
- 238000004891 communication Methods 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 10
- 238000009434 installation Methods 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 2
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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Abstract
The invention relates to the field of high-speed railway construction, and provides a simply supported box girder falling alignment device and a use method thereof. Estimating the distance between the to-be-erected simple box girder and the erected simple box girder according to the video image acquired by the beam gap width monitor, then operating the front hanging beam trolley and the rear hanging beam trolley to enable the to-be-erected simple box girder to be close to the erected simple box girder, controlling the to-be-erected simple box girder to slowly descend on the next step, starting to acquire the actual distance between the to-be-erected simple box girder and the end face of the erected simple box girder by the laser radar distance meter, and operating the front hanging beam trolley and the rear hanging beam trolley again to enable the to-be-erected simple box girder to move forwards or backwards and keep the distance required by the design with the erected simple box girder, so that the beam falling alignment of the to-be-erected simple box girder can be completed.
Description
Technical Field
The invention belongs to the field of high-speed railway construction, and particularly relates to a simply supported box girder falling alignment device and a use method thereof.
Background
At present, most of prestressed concrete simple box girders of 24m, 32m and 40m prefabricated in a girder yard are adopted in China, and the erection of 24m, 32m and 40m simple box girders is generally realized by adopting an erection mode of a transportation and erection separation type or transportation and erection integrated machine, a bridge girder erection machine 10 in the prior art comprises a main girder 11, a front hanging beam trolley 12 and a rear hanging beam trolley 13 for hoisting a to-be-erected simple box girder 30 are arranged on the main girder 11, a front vehicle 14 and a rear vehicle 15 are respectively arranged at the front end and the rear end of the main girder 11 of the transportation and erection integrated type bridge girder erection machine, front support legs and rear support legs are respectively arranged at the front end and the rear end of the main girder 11 of the transportation and erection separation type bridge girder erection machine, and the front vehicle 14 or the front support legs are all positioned on the erected simple box girder 20 in the box girder erection process.
When the box girder 30 to be erected is erected, the transportation and erection separated type girder erection mode is that a girder transporting vehicle carries the prefabricated box girder from a prefabricated girder yard to a girder erection site where a bridge girder erection machine is installed, girder feeding is firstly carried out, then rough adjustment alignment and girder falling are carried out, and when the distance between the bottom of the girder and the jack surface is 200mm, accurate alignment of the longitudinal direction and the transverse direction of a line is carried out. At the whole in-process of feeding the roof beam, falling the roof beam, the frame roof beam of counterpointing, every key position need arrange the monitoring personnel and monitor the cooperation, need in time feed the roof beam, fall the relevant information transmission of roof beam to fortune roof beam car and frame bridge crane operating personnel there, need many people to mutually support, and each process information must guarantee to transmit correctly, relies on team's strength just can accomplish whole feed the roof beam, fall the roof beam task. The whole beam feeding and falling process is long in time consuming, monitoring personnel and operating personnel are frequently communicated in an interaction mode, the number of the personnel needing to be matched is large, the beam erecting efficiency is not high, the beam falling accuracy is not high at one time, and the safety risk is large. The method for carrying and erecting 24m, 32m and 40m simply supported box girder construction of the high-speed railway by adopting the carrying and erecting all-in-one machine saves a girder carrying vehicle, adopts a set of equipment for carrying and erecting the girder, and has basically the same operation in the whole girder falling alignment process as the girder falling process of the carrying and erecting separated bridge girder erection machine. The two beam falling alignment modes and the accurate alignment effect are not essentially changed, coarse adjustment is carried out, and then fine adjustment is carried out manually by using a three-way jack. The information transmission mode is that monitoring personnel command a girder transporting vehicle and bridge girder erection machine operators to complete the whole alignment process of transporting, erecting and falling the girder, the number of signal emitting sources is large, the signal emitting sources are auxiliary monitoring personnel, and the girder transporting vehicle and the bridge girder erection machine operators passively control the bridge girder erection machine after passively receiving the signals.
Disclosure of Invention
The invention aims to provide a simple supported box girder falling alignment device which can monitor the position condition of a simple supported box girder to be erected in real time when a bridge girder erection machine falls the girder so as to ensure accurate alignment.
In order to achieve the purpose, the invention adopts the following technical scheme: the utility model provides a simply supported box roof beam falls roof beam aligning device, is setting up at the laser radar distancer of having erect simply supported box roof beam front end and the beam gap width control appearance of setting in the girder lower surface both sides of frame bridge crane, beam gap width control appearance is in the top of waiting to erect simply supported box roof beam rear end.
Furthermore, the lower surface of the main beam is respectively provided with a stone pad central line monitoring instrument corresponding to the positions of the front end and the rear end of the simply supported box girder to be erected.
Furthermore, beam bottom laser radar distance measuring instruments are arranged at the front position and the rear position of the lower surface of the simply supported box beam to be erected.
Further, a beam top center line monitor is further arranged on the lower surface of the main beam, the beam top center line monitor is close to the front end of the upper surface of the simply supported box girder to be erected, and the center of a lens of the beam top center line monitor is aligned to the center line of the upper surface of the simply supported box girder to be erected.
Further, be provided with the driver's cabin on the back car, be provided with audio and video monitoring platform in the driver's cabin, audio and video monitoring platform is connected with laser radar distancer, beam gap width monitor, base stone central line monitor, roof beam central line monitor and beam bottom laser radar distancer communication.
The invention also aims to provide a use method of the simply supported box girder falling alignment device, which is used for monitoring the position condition of the simply supported box girder to be erected in real time when the bridge girder erection machine falls the girder so as to ensure accurate alignment of the simply supported box girder.
In order to achieve the purpose, the invention adopts the following technical scheme: a use method of a simple support box girder falling alignment device comprises the following steps:
s1, before the simply supported box beam to be erected falls on the beam, fixedly installing a laser radar distance meter, a beam gap width monitor, a base stone central line monitor, a beam top central line monitor and a beam bottom laser radar distance meter, and enabling the laser radar distance meter and the beam top central line monitor to be in communication connection with an audio and video monitoring platform in a cab;
s2, roughly estimating the distance between the to-be-erected simple box girder and the erected simple box girder according to the video image collected by the girder gap width monitor by an operator, and then operating the front hanging girder trolley and the rear hanging girder trolley to enable the to-be-erected simple box girder to be close to the erected simple box girder;
s3, judging whether the central lines of the front end and the rear end of the to-be-erected simple box girder support are aligned with the central line of the cushion stone on the bridge pier column or not by an operator through the video image collected by the cushion stone central line monitor, and then operating the front hanging beam trolley and the rear hanging beam trolley to enable the front end and the rear end of the to-be-erected simple box girder support to be aligned with the cushion stone on the bridge pier column;
S4, an operator controls the front hanging beam trolley and the rear hanging beam trolley to enable the to-be-erected simple box girder to slowly descend, the laser radar distance meter starts to collect the actual distance between the to-be-erected simple box girder and the end face of the erected simple box girder, and then the front hanging beam trolley and the rear hanging beam trolley are controlled to enable the to-be-erected simple box girder to move forwards or backwards to keep the designed distance with the erected simple box girder;
s5, the laser radar range finder at the bottom of the beam collects the distance between the bottom of the simply supported box beam to be erected and the upper surface of the bridge pier column in real time, the descending of the simply supported box beam to be erected is suspended after the distance reaches a set distance, an installation auxiliary tool is arranged on the bridge pier column, and the laser radar range finder at the bottom of the beam is removed;
s6, continuing to descend the to-be-erected simple box girder, acquiring a video image of a central line position above the to-be-erected simple box girder by a beam top central line monitor, judging whether the central line of the to-be-erected simple box girder is flush with the central line of the erected simple box girder by an operator, descending the to-be-erected simple box girder completely to be aligned if the central line of the to-be-erected simple box girder is flush with the central line of the erected simple box girder, and adjusting the position of the to-be-erected simple box girder by the operator according to information acquired by a laser radar distance meter, a beam slit width monitor and a stone pad central line monitor by the operator and controlling a front hanging beam trolley and a rear hanging beam trolley to ensure that the central line of the to-be-erected simple box girder is flush with.
Compared with the prior art, the invention has the following advantages: 1. the former passive control bridge girder erection machine is changed into the active control bridge girder erection machine for girder falling alignment by the control personnel, so that the control personnel has stronger initiative and higher efficiency of controlling the bridge girder erection machine; 2. the laser radar range finder, the monitor and the like are adopted in the beam falling construction process, the beam falling alignment can be quickly and accurately performed at one time, secondary adjustment is not needed, the construction time is saved, the working efficiency is improved, and the construction period is shortened; 3. excessive auxiliary monitoring personnel are not needed in the beam falling process, so that construction operating personnel are reduced, the construction cost is saved, and the safety risk is reduced; 4. the beam falling process realizes visualization, informatization and digitization and accords with the national positioning of intelligent construction; 5. the beam falling working condition data can be conveniently and rapidly transmitted to a related supervision control center in real time, the digitization of beam falling construction is realized, and supervision and management are facilitated.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is an enlarged view of portion A of FIG. 1;
FIG. 3 is an enlarged view of portion B of FIG. 1;
fig. 4 is a bottom view of the main beam.
Reference numerals:
10. a bridge girder erection machine; 11. a main beam; 12. a front hanging beam trolley; 13. a rear hanging beam trolley; 14. front vehicle; 15. carrying out rear vehicle; 20. erecting a simply supported box girder; 30. a simply supported box girder is to be erected; 1. a laser radar range finder; 2. a beam gap width monitor; 3. a pad stone central line monitor; 4. a beam top center line monitor; 5. a beam bottom laser radar range finder; 6. and (5) an audio and video monitoring platform.
Detailed Description
The invention is further described with reference to the accompanying drawings 1-4:
the utility model provides a simply supported box roof beam falls roof beam aligning device, is including setting up at the laser radar distancer 1 that has erect simply supported box roof beam 20 front end and setting up the beam gap width monitor 2 in the girder 11 lower surface both sides of bridging machine 10, beam gap width monitor 2 is in the top of waiting to erect simply supported box roof beam 30 rear end. The beam gap width monitoring instrument 2 is at least provided with two monitoring instruments respectively arranged at two sides of the lower surface of the main beam 11, the light path direction of the beam gap width monitoring instrument 2 faces to the rear end of the simply supported box girder 30 to be erected, an operator roughly estimates the distance between the simply supported box girder 30 to be erected and the simply supported box girder 20 to be erected according to the video image collected by the beam gap width monitoring instrument 2, then the operator controls the front hanging beam trolley 12 and the rear hanging beam trolley 13 to enable the simply supported box girder 30 to be erected to be close to the simply supported box girder 20 to be erected, next, the simply supported box girder 30 to be erected can be controlled to slowly descend, the laser radar distance measuring instrument 1 starts to collect the actual distance between the simply supported box girder 30 to be erected and the end face of the simply supported box girder 20 to be erected, the front hanging beam trolley 12 and the rear hanging beam trolley 13 are controlled again to enable the simply supported box girder 30 to be erected to move forwards or backwards and keep the distance required by design with the simply supported, thus, the beam falling alignment of the simply supported box beam 30 to be erected can be completed.
As a further scheme, the central line monitoring instruments 3 of the cushion stones are respectively arranged at the positions of the lower surface of the main beam 11 corresponding to the front end and the rear end of the simply supported box beam 30 to be erected. When erecting a beam, two supports for connecting with a cushion stone are respectively arranged below the front end and the rear end of a simply supported box beam 30 to be erected, in order to ensure that the supports are aligned with the cushion stone, a cushion stone central line monitor 3 is arranged on a main beam 11, two cushion stone central line monitors 3 are respectively arranged at the front end and the rear end, and each cushion stone central line monitor 3 corresponds to the central line of the support, because the supports are positioned close to the inner sides relative to the two ends of the lower part of the simply supported box beam in the conventional design, the cushion stone central line monitor 3 is arranged at a certain distance from the front end and the rear end of the simply supported box beam 30 to be erected, the lens direction of the cushion stone central line monitor 3 is properly adjusted to enable the cushion stone central line monitor to be obliquely downwards directed to the central line of the supports, when the simply supported box beam 30 to be erected is controlled to slowly descend, the cushion stone central line monitor 3 is used for observing whether the supports on the front end and the rear end of the simply supported box beam 30 to be erected are aligned with the central line of the cushion stone, thus, the simple box girder to be erected can be ensured to be matched with the cushion stone when the simple box girder falls down completely.
As a further proposal, the simply supported box beam 30 to be erected is provided with laser radar range finders 5 at the front and rear positions of the lower surface thereof. When waiting to erect a simply supported case roof beam 30 and descend to a certain position, when about 80cm from bridge pier stud upper surface interval, need set up the installation on the bridge pier stud and assist the utensil in order to cooperate the simply supported case roof beam 30 of waiting to erect that will fall the roof beam, the distance of the beam bottom of waiting to erect a simply supported case roof beam 30 and the upper surface of bridge pier stud is gathered in real time to beam bottom laser radar distancer 5, the decline of waiting to erect a simply supported case roof beam 30 is suspended after reaching the settlement distance, arrange the installation on the bridge pier stud and assist the utensil, demolish beam bottom laser radar distancer 5 simultaneously.
As a further scheme, a beam top center line monitor 4 is further disposed on the lower surface of the main beam 11, the beam top center line monitor 4 is close to the front end position of the upper surface of the simply supported box beam 30 to be erected, and the lens center of the beam top center line monitor 4 is aligned with the center line of the upper surface of the simply supported box beam 30 to be erected. The light path direction of the beam top central line monitor 4 points to the erected simple box girder 20 from the front end of the simple box girder 30 to be erected, when the simple box girder 30 to be erected falls completely, whether the central line of the simple box girder 30 to be erected is parallel and level to the central line of the erected simple box girder 20 can be observed through the beam top central line monitor 4, generally speaking, the position of the simple box girder 30 to be erected can be determined when the position of the simple box girder 30 to be erected is adjusted according to the laser radar distance meter 1, the beam slit width monitor 2 and the cushion central line monitor 3, the beam top central line monitor 4 is used as a final guarantee for judging whether the simple box girder 30 to be erected is accurately aligned, the situation that the central lines are not parallel and level generally cannot occur, and if the situation occurs, the beam top central line monitor 4 is combined with the laser radar distance meter 1, the beam slit width monitor 2 and the cushion central line monitor 3 to be readjusted.
As a further scheme, a cab is arranged on the rear vehicle 15, an audio and video monitoring platform 6 is arranged in the cab, and the audio and video monitoring platform 6 is in communication connection with the laser radar distance meter 1, the beam seam width monitoring instrument 2, the base stone central line monitoring instrument 3, the beam top central line monitoring instrument 4 and the beam bottom laser radar distance meter 5. To transporting a disconnect-type or transporting a integral type bridge crane, can set up a driver's cabin on rear car 15 or back landing leg, the driver's cabin sets up audio and video monitoring platform 6 and is used for receiving the information that shows each instrument and gather, audio and video monitoring platform 6 receives laser radar distancer 1, the distance information that the roof beam bottom laser radar distancer 5 gathered reports in real time and reminds the control personnel, audio and video monitoring platform 6 receives beam gap width monitor 2, base stone central line monitor 3, the video image that roof beam central line monitor 4 gathered is used for controlling the personnel as the position reference.
A use method of a simple support box girder falling alignment device comprises the following steps:
s1, before the simply supported box beam 30 to be erected falls on the beam, fixedly installing a laser radar distance meter 1, a beam gap width monitor 2, a base stone central line monitor 3, a beam top central line monitor 4 and a beam bottom laser radar distance meter 5, and enabling the laser radar distance meters to be in communication connection with an audio and video monitoring platform 6 in a cab;
s2, an operator roughly estimates the distance between the to-be-erected simple box girder 30 and the erected simple box girder 20 according to the video image collected by the girder gap width monitor 2, and then operates the front hanging girder trolley 12 and the rear hanging girder trolley 13 to enable the to-be-erected simple box girder 30 to be close to the erected simple box girder 20;
s3, judging whether the central lines of the front end and the rear end of the to-be-erected simple box girder 30 are aligned with the central line of the cushion stone on the bridge pier column or not by an operator through the video image collected by the cushion stone central line monitor 3, and then operating the front hanging girder trolley 12 and the rear hanging girder trolley 13 to align the front end and the rear end of the to-be-erected simple box girder 30 with the cushion stone on the bridge pier column;
s4, an operator controls the front hanging beam trolley 12 and the rear hanging beam trolley 13 to enable the to-be-erected simple box girder 30 to slowly descend, the laser radar distance meter 1 starts to collect the actual distance between the to-be-erected simple box girder 30 and the end face of the erected simple box girder 20, and then the front hanging beam trolley 12 and the rear hanging beam trolley 13 are controlled to enable the to-be-erected simple box girder 30 to move forwards or backwards to keep the distance required by the design with the erected simple box girder 20;
S5, the laser radar range finder 5 at the bottom of the beam collects the distance between the bottom of the simply supported box girder 30 to be erected and the upper surface of the bridge pier column in real time, the descending of the simply supported box girder 30 to be erected is suspended after the distance reaches a set distance, an installation aid is arranged on the bridge pier column, and the laser radar range finder 5 at the bottom of the beam is removed;
s6, continuing to descend the simply supported box girder 30 to be erected, acquiring a video image of a central line position above the simply supported box girder 30 to be erected by the beam top central line monitor 4, judging whether the central line of the simply supported box girder 30 to be erected is parallel to the central line of the simply supported box girder 20 to be erected, if so, descending the simply supported box girder 30 to be erected to be completely aligned, and if not, operating and controlling the front hanging beam trolley 12 and the rear hanging beam trolley 13 to adjust the position of the simply supported box girder 30 to be erected according to information acquired by the laser radar distance meter 1, the beam slit width monitor 2 and the stone pad central line monitor 3, so as to ensure that the central line of the simply supported box girder 30 to be erected is parallel to the central line of the simply supported box girder 20 to be erected.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. The utility model provides a roof beam aligning device falls in simply supported box girder which characterized in that: the device comprises a laser radar distance measuring instrument (1) arranged at the front end of an erected simply supported box girder (20) and beam gap width monitoring instruments (2) arranged on two sides of the lower surface of a main girder (11) of a bridge girder erection machine (10), wherein the beam gap width monitoring instruments (2) are positioned above the rear end of the simply supported box girder (30) to be erected.
2. The simply supported box girder falling beam aligning device of claim 1, wherein: and the lower surface of the main beam (11) is provided with a stone pad central line monitoring instrument (3) corresponding to the positions of the front end and the rear end of the simply supported box beam (30) to be erected respectively.
3. The simply supported box beam falling beam aligning device of claim 2, wherein: and the front and rear positions of the lower surface of the simply supported box beam (30) to be erected are provided with beam bottom laser radar range finders (5).
4. The simply supported box girder falling beam aligning device of claim 3, wherein: the lower surface of the main beam (11) is further provided with a beam top center line monitor (4), the beam top center line monitor (4) is close to the front end position of the upper surface of the simply supported box beam (30) to be erected, and the center of a lens of the beam top center line monitor (4) is aligned to the center line of the upper surface of the simply supported box beam (30) to be erected.
5. The simply supported box girder falling beam aligning device of claim 4, wherein: be provided with the driver's cabin on back car (15), be provided with audio and video monitoring platform (6) in the driver's cabin, audio and video monitoring platform (6) are connected with laser radar distancer (1), beam gap width monitor (2), base stone central line monitor (3), roof beam central line monitor (4) and beam bottom laser radar distancer (5) communication.
6. The use method of the simple support box girder falling alignment device of claim 5 comprises the following steps:
s1, before the simply supported box beam (30) to be erected falls on the beam, fixedly installing a laser radar distance meter (1), a beam gap width monitor (2), a base stone central line monitor (3), a beam top central line monitor (4) and a beam bottom laser radar distance meter (5), and enabling the laser radar distance meters to be in communication connection with an audio and video monitoring platform (6) in a cab;
s2, an operator roughly estimates the distance between the simply supported box girder (30) to be erected and the erected simply supported box girder (20) according to the video image collected by the girder gap width monitor (2), and then operates the front hanging beam trolley (12) and the rear hanging beam trolley (13) to enable the simply supported box girder (30) to be erected to be close to the erected simply supported box girder (20);
s3, judging whether the central lines of the front end and the rear end of the simply supported box beam (30) to be erected are aligned with the central line of the cushion stone on the bridge pier column or not by an operator through the video image collected by the cushion stone central line monitor (3), and then operating the front hanging beam trolley (12) and the rear hanging beam trolley (13) to align the front end and the rear end of the simply supported box beam (30) to be erected with the cushion stone on the bridge pier column;
S4, an operator controls the front hanging beam trolley (12) and the rear hanging beam trolley (13) to enable the to-be-erected simple box beam (30) to slowly descend, the laser radar distance meter (1) starts to collect the actual distance between the to-be-erected simple box beam (30) and the end face of the erected simple box beam (20), and then the front hanging beam trolley (12) and the rear hanging beam trolley (13) are controlled to enable the to-be-erected simple box beam (30) to move forwards or backwards to keep the distance required by design with the erected simple box beam (20);
s5, the beam bottom laser radar range finder (5) collects the distance between the beam bottom of the to-be-erected simple box beam (30) and the upper surface of the bridge pier column in real time, the to-be-erected simple box beam (30) is suspended from descending after the set distance is reached, auxiliary tools are arranged on the bridge pier column, and the beam bottom laser radar range finder (5) is removed;
s6, the to-be-erected simple box girder (30) continues to descend, the beam top central line monitor (4) collects video images of the central line position above the to-be-erected simple box girder (30), an operator judges whether the central line of the to-be-erected simple box girder (30) is level with the central line of the erected simple box girder (20), if the central line is level, the to-be-erected simple box girder (30) descends and completely falls to the beam for alignment, and if the central line is not level, the operator controls the front hanging beam trolley (12) and the rear hanging beam trolley (13) to adjust the position of the to-be-erected simple box girder (30) according to information collected by the laser radar range finder (1), the beam seam width monitor (2) and the cushion central line monitor (3), so that the central line of the to-be-erected simple box girder (30) is level with the central line of the erected simple box girder (20).
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112813834A (en) * | 2020-12-31 | 2021-05-18 | 中铁八局集团昆明铁路建设有限公司 | Beam piece mounting system and mounting method |
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| CN107300920A (en) * | 2017-06-26 | 2017-10-27 | 燕山大学 | SLJ900 flow type bridge erecting machines fortune beam crosses tunnel automated driving system and crosses tunnel approach |
| CN210031535U (en) * | 2019-04-24 | 2020-02-07 | 中铁第五勘察设计院集团有限公司 | Simply supported box girder beam falling alignment device |
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| CN112813834A (en) * | 2020-12-31 | 2021-05-18 | 中铁八局集团昆明铁路建设有限公司 | Beam piece mounting system and mounting method |
| CN112813834B (en) * | 2020-12-31 | 2022-12-16 | 中铁八局集团昆明铁路建设有限公司 | Beam piece mounting system and mounting method |
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