CN112482232A - Beam falling system for dismantling box girder Bailey beam support of urban railway and construction method - Google Patents
Beam falling system for dismantling box girder Bailey beam support of urban railway and construction method Download PDFInfo
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- CN112482232A CN112482232A CN202011372416.8A CN202011372416A CN112482232A CN 112482232 A CN112482232 A CN 112482232A CN 202011372416 A CN202011372416 A CN 202011372416A CN 112482232 A CN112482232 A CN 112482232A
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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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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
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Abstract
The invention provides a girder dropping system for dismantling box girder Bailey girder supports of urban railways and a construction method, wherein the girder dropping system comprises a plurality of girder dropping units, and each girder dropping unit comprises: the reaction frame comprises a door-shaped frame; the suspension frame comprises a plurality of suspension rods, the suspension rods are vertically arranged, movable beams are arranged on the inner sides of the portal frames, and gaskets and nuts are arranged on the suspension rods; a jack; a bottom joist. In the invention, the Bailey beam support adopts an in-situ falling dismantling mode, the site adaptability is strong, and the whole process of falling, dismantling and transferring can be realized only by a unilateral access way; the occupied area is small, and the adverse effect on surrounding buildings and the environment is small; the method has the advantages that the mechanical construction degree of the bridge and the matched construction technology are improved by utilizing the reaction frame to remove the Bailey beam support, the number of operators is reduced, and the construction safety risk is effectively reduced; the construction efficiency is obviously improved, quick falling and dismantling can be realized, the overhead working time is shortened, and the potential safety hazard of equipment and personnel construction is reduced.
Description
Technical Field
The invention relates to the technical field of bridge construction, in particular to a beam falling system for dismantling box girder Bailey beam supports of urban railways and a construction method.
Background
After a section of urban railway box girder is formed, a Bailey beam bracket used in the pouring process needs to be dismantled, and then the lower part of the next section of box girder is erected. In the prior art, the dismantling construction of the Bailey beam bracket has the following defects: the area occupied by the dismantling process is large, and the access roads on two sides need to be utilized simultaneously, so that the construction of other work types is inconvenient; the occupied workers are more, and the labor intensity of the workers is high; the construction efficiency is lower, the high-altitude operation time is long, and the potential safety hazard is higher.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a beam falling system for dismantling a box girder bailey beam bracket of a railway in a city area and a construction method.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a railway box girder beiLei beam support in market area is demolishd with roof beam system that falls, includes a plurality of roof beam units that fall, and the roof beam unit that falls includes:
the reaction frame comprises a door-shaped frame, and the door-shaped frame is supported at the top of the concrete beam body;
the suspension frame comprises a plurality of suspension rods, the suspension rods are vertically arranged and penetrate through the portal frame and the concrete beam body, movable beams are arranged on the inner sides of the portal frame and penetrate through the movable beams, and gaskets and nuts used for limiting the portal frame and the movable beams are arranged on the suspension rods;
the jack is positioned between the movable beam and the concrete beam body;
the bottom joist is located below all the Bailey beam supports, and the suspender penetrates through the bottom joist and is limited with the bottom joist through a gasket and a nut.
Furthermore, the door frame comprises two inverted T-shaped stand columns, leveling plates are arranged at the bottoms of the stand columns, a cross beam is arranged between the two stand columns, two ends of the cross beam are respectively connected with the tops of the two stand columns in a welded mode, and the hanging rods are connected with the cross beam.
Further, the pillar includes stand and stull, and the stand both sides all are equipped with the bracing.
Furthermore, the number of the hanging rods is two and the hanging rods are respectively positioned on two sides of the jack.
Furthermore, the bottom joist comprises two I-beams, the tops and/or bottoms of the two I-beams are fixedly connected through a plurality of connecting plates, and the hanging rod is positioned between the two I-beams
Furthermore, a plurality of stiffening ribs are arranged between the two I-shaped steels at the joint of the two I-shaped steels and the lifting rod.
A construction method for dismantling a box girder Bailey beam bracket of a urban railway comprises the following specific steps:
step one, the side die is disassembled,
when the strength of the cured concrete beam body reaches 80%, the inner die support is loosened, primary tensioning is carried out, after the primary tensioning is finished, the vertical support rods of the side dies are loosened, the transverse connecting bolts of the side dies are loosened, and the outer dies on two sides are moved forward to the next hole beam for assembling the side dies;
step two, a beam falling system is installed,
performing final tensioning when the concrete strength reaches 100% and the age is not less than 10 days, and installing a beam falling system for dismantling the box girder bailey beam bracket of the urban railway after the final tensioning is finished;
step three, unloading the sand from the sand box,
after the bottom joist is completely stressed, opening the leak-off ports of all sand boxes on the same row at the same time, and taking out sand by hook steel bars if necessary, so that the height of the Bailey beam bracket of the main supporting beam is uniformly reduced, and the main supporting beam is separated from the bottom of the Bailey beam bracket;
step four, dismantling the main supporting beam
The limit connection between the main supporting beam and the sand cylinder is released, and the main beam is directly lifted off by a truck crane and slowly lowered;
step five, dismantling the steel pipe buttress,
removing the connection between the sand cylinder and the steel pipe buttress, lifting the sand cylinder by using an automobile crane, removing the transverse connection between the steel pipe buttress and the concrete pier body, removing the transverse cross brace and the horizontal truss connecting rod piece of the steel pipe buttress, and finally hoisting the steel pipe buttress one by using a crane;
step six, the Bailey beam bracket falls down,
all the jacks are slowly and synchronously retracted, after the jacks are retracted to the minimum stroke, the spacers and the nuts on the top of the portal frame anchor the finish rolling deformed steel bars, and at the moment, the portal frame bears the whole weight of the Bailey beam support; the height of the movable beam is raised, the jack is adjusted to the maximum stroke, the jack is stressed again, then the nut for limiting the portal frame is raised, and the process is repeated in such a way, so that the Bailey beam bracket 6 is slowly descended to the ground;
step seven, dismantling the bottom die and the Bailey beam bracket,
and (3) after the bottom die, the pre-camber adjusting block and the square timber are sequentially pulled out, stacking the transverse I10I-steel distribution beam at the position below the flange plate in a bundle manner, and loading and transporting the distribution beam away by using a crane.
Furthermore, the portal frame is formed by welding I25a I-shaped steel, I22a I-shaped steel and I16 channel steel, the specification of the jack is 100t, the hanger rod is made of phi 32mm finish rolling deformed steel bar, and the bottom joist is made of double-spliced I40b I-shaped steel.
And further, in the second step, four reaction supports are arranged on the beam surface of the concrete beam body, the longitudinal bridge is arranged from the center line of the beam joint to the midspan position by 5.5m, the transverse bridge is arranged at a distance of 6.52m in the axial direction, and the distance from the central axis of the beam body is 3.26 m.
And step seven, for the box girder with the shorter pier, the Bailey girder support which cannot be directly hoisted needs to be transversely moved to the side of the concrete girder body by the chain block, and then the Bailey girder support is hoisted and transferred by the cooperation of a crane.
The invention has the beneficial effects that: in the invention, the Bailey beam support adopts an in-situ falling dismantling mode, the site adaptability is strong, and the whole process of falling, dismantling and transferring can be realized only by a unilateral access way; the occupied area is small, and the adverse effect on surrounding buildings and the environment is small; the method has the advantages that the mechanical construction degree of the bridge and the matched construction technology are improved by utilizing the reaction frame to remove the Bailey beam support, the number of operators is reduced, and the construction safety risk is effectively reduced; the construction efficiency is obviously improved, quick falling and dismantling can be realized, the overhead working time is shortened, and the potential safety hazard of equipment and personnel construction is reduced.
Drawings
FIG. 1 is a front cross-sectional view of the present invention;
FIG. 2 is a left side cross-sectional view of the present invention;
FIG. 3 is a schematic structural view of a bottom joist;
FIG. 4 is an enlarged view taken at A in FIG. 2;
in the figure: 1-reaction frame; 11-a portal frame; 111-upright post; 112-a screed plate; 113-a cross beam; 12-a walking beam; 2-a suspension frame; 21-a boom; 22-a nut; 3-a jack; 4-bottom joist; 41-I-steel; 42-a connecting plate; 43-a stiffener; 5-a concrete beam body; 6-Bailey beam support; 7-main supporting beam; 8-a sand cylinder; 9-steel pipe buttress;
the following detailed description will be made in conjunction with embodiments of the present invention with reference to the accompanying drawings.
Detailed Description
The invention is further illustrated by the following examples:
the utility model provides a railway box girder beiLei beam support in market area is demolishd with roof beam system that falls, includes a plurality of roof beam units that fall, and the roof beam unit that falls includes:
the reaction frame 1, the reaction frame 1 includes the door-shaped frame 11, the door-shaped frame 11 supports on the top of the concrete beam body 5;
the suspension frame 2 comprises a plurality of suspension rods 21, the suspension rods 21 are vertically arranged, the suspension rods 21 penetrate through the portal frame 11 and the concrete beam body 5, movable beams 12 are arranged on the inner side of the portal frame 11, the suspension rods 21 penetrate through the movable beams 12, and gaskets and nuts 22 used for limiting the portal frame 11 and the movable beams 12 are arranged on the suspension rods 21;
the jack 3 is positioned between the movable beam 12 and the concrete beam body 5;
the bottom joist 4, bottom joist 4 are located the below of whole bailey beam support 6, and jib 21 runs through bottom joist 4 and sets up and carry on spacingly through gasket and nut 22 and bottom joist 4.
Further, the portal frame 11 includes two inverted T-shaped upright posts 111, a leveling plate 112 is disposed at the bottom of each upright post 111, a cross beam 113 is disposed between the two upright posts 111, two ends of the cross beam 113 are respectively connected with the tops of the two upright posts 111 by welding, and the suspension rod 21 is connected with the cross beam 113.
Further, the pillar 111 includes a pillar and a cross brace, and both sides of the pillar are provided with inclined braces.
Further, the number of the suspension rods 21 is two and the two suspension rods are respectively positioned at two sides of the jack 3.
Further, the bottom joist 4 comprises two i-beams 41, the tops and/or bottoms of the two i-beams 41 are fixedly connected by a plurality of connecting plates 42, and the hanger rod 21 is positioned between the two i-beams 41
Furthermore, a plurality of stiffening ribs 43 are arranged between the two I-shaped steel bars 41 at the connecting part with the suspension rod 21.
A construction method for dismantling a box girder Bailey beam bracket of a urban railway comprises the following specific steps:
step one, the side die is disassembled,
when the strength of the health-preserving concrete beam body 5 reaches 80%, the inner die support is loosened, primary tensioning is carried out, after the primary tensioning is finished, the vertical support rods of the side dies are loosened, the transverse connecting bolts of the side dies are loosened, and the outer dies on two sides are moved forward to the next hole beam to carry out side die assembly;
step two, a beam falling system is installed,
performing final tensioning when the concrete strength reaches 100% and the age is not less than 10 days, and installing the girder falling system for dismantling the Bailey girder bracket of the urban railway box girder according to claim 1 after the final tensioning is completed;
step three, unloading the sand from the sand box,
after the bottom joist 4 is completely stressed, opening the leak-off ports of all sand boxes on the same row at the same time, and taking out sand by hook steel bars if necessary, so that the height of the Bailey beam bracket 6 of the main supporting crossbeam 7 is uniformly reduced, and the main supporting crossbeam 7 is separated from the bottom of the Bailey beam bracket 6;
step four, dismantling the main supporting beam 7
The limit connection between the main supporting beam 7 and the sand cylinder 8 is released, and the sand cylinder is directly lifted away from the main beam by using a truck crane and slowly lowered;
step five, dismantling the steel pipe buttress 9,
the connection between the sand cylinder 8 and the steel pipe buttresses 9 is removed, the sand cylinder 8 is lifted away by using a truck crane, the transverse connection between the steel pipe buttresses 9 and the connection between the steel pipe buttresses and the concrete pier bodies are removed, then the transverse cross braces and the horizontal truss connecting rod pieces of the steel pipe buttresses 9 are removed, and finally the steel pipe buttresses 9 are hoisted one by using a crane;
step six, the Bailey beam bracket 6 falls down,
all the jacks 3 are slowly and synchronously retracted, after the jacks 3 are retracted to the minimum stroke, the gasket and the nut 22 at the top of the portal frame 11 anchor the finish rolling deformed steel bar, and at the moment, the portal frame 11 bears the total weight of the Bailey beam support 6; the height of the movable beam 12 is raised, the jack 3 is adjusted to the maximum stroke, the jack 3 is stressed again, then the nut 22 for limiting the portal frame 11 is raised, and the reciprocating operation is carried out, so that the Bailey beam support 6 slowly falls to the ground;
step seven, detaching the bottom die and the Bailey beam bracket 6,
and (3) after the bottom die, the pre-camber adjusting block and the square timber are sequentially pulled out, stacking the transverse I10I-steel distribution beam at the position below the flange plate in a bundle manner, and loading and transporting the distribution beam away by using a crane.
Furthermore, the portal frame 11 is formed by welding I25a I-shaped steel, I22a I-shaped steel and I16 channel steel, the specification of the jack 3 is 100t, the hanger rod 21 is made of phi 32mm finish-rolled deformed steel bar, and the bottom joist 4 is made of double-spliced I40b I-shaped steel.
Furthermore, in the second step, four reaction supports are arranged on the 5 beam surfaces of the concrete beam body, the longitudinal bridge direction is arranged from the center line of the beam joint to the midspan position by 5.5m, the distance between the transverse bridge directions is 6.52m, and the distance between the transverse bridge directions and the central axis of the beam body is 3.26 m.
Further, in the seventh step, for the box girder with a short pier height, for the bailey girder support 6 which cannot be directly hoisted, the bailey girder support 6 needs to be transversely moved to the side of the concrete girder body 5 by using a chain block, and then the bailey girder support is hoisted and transported by using the cooperation of a crane.
In the invention, the Bailey beam bracket 6 adopts an in-situ falling dismantling mode, the site adaptability is strong, and the whole process of falling, dismantling and transferring can be realized only by a unilateral access way; the occupied area is small, and the adverse effect on surrounding buildings and the environment is small; the utilization of the reaction frame 1 for dismantling the Bailey beam improves the mechanical construction degree of the bridge and the matched construction technology thereof, reduces the number of operators and effectively reduces the construction safety risk; the construction efficiency is obviously improved, quick falling and dismantling can be realized, the overhead working time is shortened, and the potential safety hazard of equipment and personnel construction is reduced.
The present invention has been described in connection with the specific embodiments, and it is obvious that the specific implementation of the present invention is not limited by the above-mentioned manner, and it is within the protection scope of the present invention as long as various modifications are made by using the method concept and technical solution of the present invention, or the present invention is directly applied to other occasions without modification.
Claims (10)
1. The utility model provides a railway box girder beiLei beam support in city field is demolishd with roof beam system that falls, includes a plurality of roof beam units that fall, and its characterized in that falls the roof beam unit and includes:
the reaction frame (1), the reaction frame (1) includes a door-shaped frame (11), the door-shaped frame (11) is supported on the top of the concrete beam body (5);
the suspension frame (2), the suspension frame (2) comprises a plurality of suspension rods (21), the suspension rods (21) are vertically arranged, the suspension rods (21) penetrate through the portal frame (11) and the concrete beam body (5), the movable beam (12) is arranged on the inner side of the portal frame (11), the suspension rods (21) penetrate through the movable beam (12), and gaskets and nuts (22) used for limiting the portal frame (11) and the movable beam (12) are arranged on the suspension rods (21);
the jack (3), the jack (3) is located between the walking beam (12) and the concrete beam body (5);
the bottom joist (4), bottom joist (4) are located the below of whole bailey roof beam support (6), and jib (21) run through bottom joist (4) and set up and carry on spacingly through gasket and nut (22) and bottom joist (4).
2. The girder dropping system for removing the box girder bailey girder bracket of the urban railway according to claim 1, wherein the portal frame (11) comprises two inverted T-shaped upright posts (111), leveling plates (112) are arranged at the bottoms of the upright posts (111), a cross beam (113) is arranged between the two upright posts (111), two ends of the cross beam (113) are respectively connected with the tops of the two upright posts (111) in a welding manner, and the hanger rods (21) are connected with the cross beam (113).
3. The girder dropping system for dismantling a urban railway box girder bailey girder according to claim 2, wherein the pillars (111) comprise vertical pillars and horizontal braces, and inclined braces are provided on both sides of the vertical pillars.
4. The girder dropping system for urban railway box girder beret girder erection according to claim 1, wherein the number of the hanger rods (21) is two and located on both sides of the jack (3), respectively.
5. The girder dropping system for urban railway box girder bailey beam bracket dismantling according to claim 1, wherein the bottom joist (4) comprises two i-beams (41), the tops and/or bottoms of the two i-beams (41) are fixedly connected by a plurality of connecting plates (42), and the hanger rod (21) is located between the two i-beams (41).
6. The girder dropping system for removing the Bailey girder bracket of the urban railway box girder according to claim 5, wherein a plurality of stiffening ribs (43) are arranged between the two I-shaped steels (41) at the joint with the hanger rod (21).
7. A construction method for dismantling a box girder Bailey beam bracket of a urban railway is characterized by comprising the following specific steps:
step one, the side die is disassembled,
when the strength of the health-preserving concrete beam body (5) reaches 80%, the inner die support is loosened, primary tensioning is carried out, after the primary tensioning is finished, the vertical support rods of the side dies are loosened, the transverse connecting bolts of the side dies are loosened, and the outer dies on two sides are moved forward to the next hole beam to carry out side die assembly;
step two, a beam falling system is installed,
performing final tensioning when the concrete strength reaches 100% and the age is not less than 10 days, and installing the girder falling system for dismantling the box girder bailey girder bracket of the urban railway according to any one of claims 1 to 6 after the final tensioning is completed;
step three, unloading the sand from the sand box,
after the bottom joist (4) is completely stressed, simultaneously opening the leak-off ports of all sand boxes on the same row, and taking out sand by hook steel bars if necessary, so that the height of the main supporting crossbeam (7) and the Bailey beam bracket (6) is uniformly reduced, and the main supporting crossbeam (7) is separated from the bottom of the Bailey beam bracket (6);
step four, dismantling the main supporting beam (7)
The limit connection between the main supporting beam (7) and the sand cylinder (8) is released, and the main supporting beam is directly lifted away from the truck crane and slowly lowered down;
fifthly, dismantling the steel pipe buttress (9),
the connection between the sand cylinder (8) and the steel pipe buttresses (9) is removed, the sand cylinder (8) is lifted away by using a truck crane, the transverse connection between the steel pipe buttresses (9) and the connection between the steel pipe buttresses and the concrete pier body are removed, then transverse cross braces and horizontal truss connecting rod pieces of the steel pipe buttresses (9) are removed, and finally the steel pipe buttresses (9) are hoisted one by using a crane;
step six, falling the Bailey beam bracket (6),
all the jacks (3) are slowly and synchronously retracted, after the jacks (3) are retracted to the minimum stroke, a gasket and a nut (22) at the top of the portal frame (11) anchor finish rolling deformed steel bars, and at the moment, the portal frame (11) bears the total weight of the Bailey beam support (6); the height of the movable beam (12) is increased, the jack (3) is adjusted to the maximum stroke, the jack (3) is stressed again, and then the nut (22) for limiting the portal frame (11) is increased, so that the reciprocating motion is performed, and the Bailey beam support (6) is slowly descended to the ground;
seventhly, detaching the bottom die and the Bailey beam bracket (6),
and (3) after the bottom die, the pre-camber adjusting block and the square timber are sequentially pulled out, stacking the transverse I10I-steel distribution beam at the position below the flange plate in a bundle manner, and loading and transporting the distribution beam away by using a crane.
8. The urban railway box girder bailey beam bracket dismantling construction method according to claim 7, wherein the portal frame (11) is formed by welding I25a, I22a I-shaped steel and I16 channel steel, the jack (3) is 100t in specification, the hanger rod (21) is made of phi 32mm finish-rolled deformed steel, and the bottom joist (4) is made of double-spliced I40b I-shaped steel.
9. The urban railway box girder bailey girder support dismantling construction method according to claim 7 is characterized in that in the second step, four reaction supports are installed on the girder surface of the concrete girder body (5), the longitudinal bridge is arranged from the center line of the beam joint to the midspan position by 5.5m, the distance between the transverse bridge and the bridge is 6.52m, and the distance between the transverse bridge and the central axis of the girder body is 3.26 m.
10. The urban railway box girder support dismantling construction method according to claim 7, characterized in that in the seventh step, for box girders with shorter pier heights, for box girders which cannot directly hoist the Bailey girder support (6), the Bailey girder support (6) is transversely moved to the side of the concrete girder body (5) by using a chain block, and then hoisted and transported by using a crane in a matching manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372416.8A CN112482232A (en) | 2020-11-30 | 2020-11-30 | Beam falling system for dismantling box girder Bailey beam support of urban railway and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011372416.8A CN112482232A (en) | 2020-11-30 | 2020-11-30 | Beam falling system for dismantling box girder Bailey beam support of urban railway and construction method |
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| CN202011372416.8A Pending CN112482232A (en) | 2020-11-30 | 2020-11-30 | Beam falling system for dismantling box girder Bailey beam support of urban railway and construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113026566A (en) * | 2021-03-23 | 2021-06-25 | 中铁一局集团第二工程有限公司 | Reverse hoisting system and method for dismantling Bailey beam support |
| CN113202027A (en) * | 2021-04-07 | 2021-08-03 | 中交路桥建设有限公司 | Method for quickly dismantling cast-in-place beam steel pipe pile support |
| CN113216023A (en) * | 2021-05-28 | 2021-08-06 | 中交路桥建设有限公司 | Method for dismantling small-space bracket of Pi-shaped cable-stayed bridge |
| CN114541267A (en) * | 2022-03-04 | 2022-05-27 | 中铁一局集团建筑安装工程有限公司 | Bridge girder erection machine capable of automatically unloading girder |
| CN114808772A (en) * | 2022-02-28 | 2022-07-29 | 沈阳铁道勘察设计院有限公司 | Method for decomposing, reinforcing and dismantling beam lattice over existing railway continuous beam bridge |
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2020
- 2020-11-30 CN CN202011372416.8A patent/CN112482232A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113026566A (en) * | 2021-03-23 | 2021-06-25 | 中铁一局集团第二工程有限公司 | Reverse hoisting system and method for dismantling Bailey beam support |
| CN113202027A (en) * | 2021-04-07 | 2021-08-03 | 中交路桥建设有限公司 | Method for quickly dismantling cast-in-place beam steel pipe pile support |
| CN113216023A (en) * | 2021-05-28 | 2021-08-06 | 中交路桥建设有限公司 | Method for dismantling small-space bracket of Pi-shaped cable-stayed bridge |
| CN114808772A (en) * | 2022-02-28 | 2022-07-29 | 沈阳铁道勘察设计院有限公司 | Method for decomposing, reinforcing and dismantling beam lattice over existing railway continuous beam bridge |
| CN114541267A (en) * | 2022-03-04 | 2022-05-27 | 中铁一局集团建筑安装工程有限公司 | Bridge girder erection machine capable of automatically unloading girder |
| CN114541267B (en) * | 2022-03-04 | 2024-04-19 | 中铁一局集团建筑安装工程有限公司 | Bridge girder erection machine capable of automatically unloading girder |
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