CN111646101B - Folding type bridge device for circular tube conveyor and installation method of folding type bridge device - Google Patents
Folding type bridge device for circular tube conveyor and installation method of folding type bridge device Download PDFInfo
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- CN111646101B CN111646101B CN201911179086.8A CN201911179086A CN111646101B CN 111646101 B CN111646101 B CN 111646101B CN 201911179086 A CN201911179086 A CN 201911179086A CN 111646101 B CN111646101 B CN 111646101B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G15/00—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration
- B65G15/08—Conveyors having endless load-conveying surfaces, i.e. belts and like continuous members, to which tractive effort is transmitted by means other than endless driving elements of similar configuration the load-carrying surface being formed by a concave or tubular belt, e.g. a belt forming a trough
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65G—TRANSPORT OR STORAGE DEVICES, e.g. CONVEYORS FOR LOADING OR TIPPING, SHOP CONVEYOR SYSTEMS OR PNEUMATIC TUBE CONVEYORS
- B65G41/00—Supporting frames or bases for conveyors as a whole, e.g. transportable conveyor frames
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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
- E01D18/00—Bridges specially adapted for particular applications or functions not provided for elsewhere, e.g. aqueducts, bridges for supporting pipe-lines
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Abstract
The invention discloses a folding bridge frame device for a circular tube conveyor, which comprises at least two tower frames arranged on adjacent mountain bodies, a plurality of connecting pull rods and two folding bridge frames respectively hinged with different tower frames, wherein the head end of each folding bridge frame is hinged with each tower frame, each folding bridge frame comprises a plurality of basic bridge frames sequentially hinged, two ends of each connecting pull rod are respectively movably connected with each tower frame and the basic bridge frame of the folding bridge frame hinged with each tower frame, and the two folding bridge frames are hinged through the basic bridge frame at the tail end of each folding bridge frame. Compared with the prior art, the folding type bridge frame device provided by the invention has the advantages that the installation cost is low, the time is short, when the folding type bridge frame device is installed between two disconnected mountains, a mountain winding road is not required to be built, the installation tasks can be simultaneously carried out on two sides of the mountain with the passage, the engineering cost is reduced, the installation time is saved, and the engineering progress is improved.
Description
Technical Field
The invention relates to a folding bridge device for a circular tube conveyor and an installation method thereof, in particular to a mechanical folding bridge device.
Background
The circular tube belt conveyor is a special belt conveyor which has good sealing performance, low environmental pollution and large conveying inclination angle and is suitable for complex field terrain arrangement. Pipe belt conveyor adopts built on stilts to lay, generally all adopts and utilizes original road or opens up interim construction way mode in one side along the line, makes things convenient for the transportation and the installation in later stage. However, the pipe belt machine arranged in the mountainous area has the following disadvantages by adopting the existing installation mode:
1. the equipment transportation is difficult. The pipeline machine is in an unmanned mountain area along the line, and has dangerous and severe gullies, and no original road utilization. And (5) planning to construct a mountain winding construction access road for transportation and installation construction. Because the mountains in certain areas are small hilly terrains, the mountains are small in size, large in gradient, deep in gully and large in section, the construction and transportation of the construction access roads are extremely difficult.
2. The terrain is fluctuant, the equipment is installed and overturns over the ridge, and the transportation and hoisting difficulty is high. Temporary roads must be repaired when the transportation and hoisting machinery of the equipment enters, temporary assembly sites need to be repaired when the pipe belt conveyor is assembled, and particularly, the hoisting is very difficult when the equipment and the installation of a plurality of deep trenches and steep slope equipment of the pipe belt conveyor are assembled and installed.
Therefore, in the process of bulk cargo transportation in mountainous areas, the transportation cost is high, the difficulty is high, and the existing transportation method has great limitations.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides a folding bridge device for a circular tube conveyor and an installation method thereof.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a folding bridge frame device for a circular tube conveyor comprises at least two towers arranged on adjacent mountain bodies, a plurality of connecting pull rods and two folding bridge frames hinged with different towers respectively, the head ends of the folding bridge frames are hinged with the towers, each folding bridge frame comprises a plurality of basic bridge frames hinged in sequence, two ends of each connecting pull rod are movably connected with the towers and the basic bridge frames of the folding bridge frames hinged with the towers respectively, and the two folding bridge frames are hinged through the basic bridge frames at the tail ends of the folding bridge frames.
As a further improvement of the above technical solution:
the pylon includes H type pylon main part and earth anchor subassembly, all be equipped with the connection hank seat on pylon main part and the earth anchor subassembly, the pylon main part is fixed in on the mountain body ground after being connected through connecting the hank seat with the earth anchor subassembly.
The tower comprises a tower body, a plurality of connecting hinge seats are arranged on two sides of the tower body in a mirror image mode, the connecting hinge seats are connected with the connecting hinge seats on one side, close to a mountain, of the tower through diagonal draw bars arranged in a matched mode, and the connecting hinge seats on the other side of the tower are hinged to different connecting draw bars respectively.
The ground anchor assembly is buried underground at the bottom of the ground, the connecting hinge base is fixedly installed on a mountain foundation through a high-strength bolt, and two ends of each inclined pull rod are respectively connected with the connecting hinge base and each connecting hinge base on one side of the tower main body.
And the column base of the tower body is fixed on a mountain foundation through an earth anchor bolt.
The basic bridges at the head and the tail ends of the folding bridges are gradually reduced or increased in width according to the hinge sequence.
The basic bridge frame is formed by bending two sides of a plate-shaped plate upwards, the cross section of the basic bridge frame is U-shaped, two ends of the basic bridge frame are provided with connecting hinge seats, and two ends of adjacent basic bridge frames are hinged through the connecting hinge seats.
The basic bridge frame is also provided with a connecting rod hinge seat, and the connecting rod hinge seat is hinged with the connecting pull rod.
Another object of the present invention is to provide the method for installing the folding bridge device for the circular tube conveyor, which comprises the following steps:
step a) a tower body is fixedly arranged on a mountain foundation, one end of a diagonal draw bar is connected with a connecting hinge base, and the other end of the diagonal draw bar is connected with the tower body, so that the tower is fixed on the mountain foundation;
b) connecting a connecting hinged support at the head end of a basic bridge at the head end of the folding bridge and a connecting hinged support at the bottom of one side, far away from the mountain, of the tower frame by using a pin shaft, pulling a connecting rod hinged support on the basic bridge at the head end of the folding bridge by using a winch through a steel wire rope, connecting the basic bridge to the connecting hinged support of the tower frame main body by using a connecting pull rod after the placing angle of the folding bridge is adjusted, and then loosening the pulled steel wire rope;
and c) fixing the steel wire rope on a second section of basic bridge frame connected with a first section of basic bridge frame at the head end of the folding bridge frame, rotating and opening the second section of basic bridge frame folded on the first section of basic bridge frame by using a hydraulic cylinder with a connecting hinge base at the folding end as a center, dragging the folding bridge frame to be slowly placed in the horizontal direction by the steel wire rope through a pulley block and a hoisting mechanism temporarily installed on the tower frame when the folding bridge frame is erected, and installing the basic bridge frame on the tower frame by using a connecting pull rod after the installation angle of the second section of basic bridge frame is adjusted.
And (4) completing the installation and debugging of the nth section of basic bridge.
The last section of basic bridge frame of the folding bridge frame connected with the two rockers is unfolded and then hinged with each other, and the basic bridge frame is connected through a pin shaft at the end of the basic bridge frame.
Compared with the prior art, the invention has the following advantages:
1. the installation cost is low, the time is short. When the installation is carried out between two disconnected mountains, a winding road is not required to be built, installation tasks can be carried out on two sides of the mountains with the passage way, the construction cost is reduced, the installation time is saved, and the construction progress is improved.
2. Simple structure and convenient installation. Because the whole bridge frame adopts a folding structure, and the bridge frames are connected by the pin shafts, the structure is simple, and the on-site hoisting and dismounting are convenient.
3. And large-scale hoisting equipment is not needed in the installation process. The weight of each component of the folding bridge is light, and an overlong lifting arm is not needed.
4. Beautiful appearance and environmental protection.
Drawings
FIG. 1 is a schematic view of a tower body of a folding bridge apparatus according to an embodiment of the present invention;
fig. 2 is a schematic view illustrating a tower and a folding bridge in the folding bridge apparatus according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2;
FIG. 4 is a schematic view of a basic bridge connection provided by an embodiment of the present invention;
FIG. 5 is a schematic view of a connection layout of a folding bridge device between two mountain bodies according to an embodiment of the present invention;
FIG. 6 is a schematic illustration of an installation provided by an embodiment of the present invention;
wherein, 0, mountain body; 1. a tower; 11. a tower body; 12. connecting a twisting seat; 13. a ground anchor assembly; 14. a diagonal member; 15. a ground anchor bolt; 2. connecting a pull rod; 3. folding the bridge; 31. a base bridge; 311. connecting a twisting seat; 312. a connecting rod hinge seat; 4. a winch; 5. a hydraulic cylinder; 6. a wire rope; 7. and (4) a pulley block.
Detailed Description
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1 to 5, the folding bridge device for a circular tube conveyor of the present embodiment includes at least two towers 1 mounted on adjacent mountains 0, a plurality of connecting rods 2, and two folding bridges 3 respectively hinged to different towers 1; the tower 1 comprises an H-shaped tower body 11 and a ground anchor assembly 13, the tower body 11 and the ground anchor assembly 13 are both connected with a connecting hinge base 12 through high-strength bolts, and the tower body 11 and the ground anchor assembly 13 are fixed on a mountain 0 foundation after being connected through the connecting hinge base 12; a plurality of connecting hinge bases 12 are arranged on two sides of the tower body 11 in a mirror image manner, the connecting hinge bases 12 are connected with the connecting hinge bases 12 on one side of the tower 1 close to the mountain body 0 through matched diagonal draw bars 14, and the connecting hinge bases 12 on the other side of the tower 1 are respectively hinged with different connecting pull rods 2; the folding bridge frame 3 comprises a plurality of basic bridge frames 31 which are sequentially hinged, two ends of each basic bridge frame 31 are provided with connecting hinge seats 311, two ends of each adjacent basic bridge frame 31 are hinged through the connecting hinge seats 311, each basic bridge frame 31 is provided with a connecting rod hinge seat 312, and each connecting rod hinge seat 312 is hinged with the corresponding connecting pull rod 2; two ends of the connecting pull rod 2 are respectively movably connected with the tower 1 and the basic bridge 31 of the folding bridge 3 hinged with the tower 1, namely, one end of the connecting pull rod 2 is hinged with the connecting hinge base 12 of the tower 1, and the other end of the connecting pull rod 2 is hinged with the connecting rod hinge base 312; the head end of each folding bridge 3 is hinged with the connecting hinge base 12 at the bottom of the side, away from the mountain body 0, of the corresponding tower 1, the two folding bridges 3 are hinged through the basic bridges 31 at the tail ends of the folding bridges 3, specifically, the tower 1 is installed on the mountain body 0 on one side, the folding bridge 3 is hinged on the tower 1, the tower 1 and each basic bridge 31 of the folding bridges 3 are connected in a reinforcing mode through the connecting pull rod 2, and the tail ends of the folding bridges 3 corresponding to the towers 1 on the adjacent mountain bodies 0 are hinged through the connecting hinge base 311, so that the folding bridge device for the circular tube conveyor and installed across the mountain body 0 is formed.
In this embodiment, the ground anchor assembly 13 is buried in the ground, the connecting hinge base 12 is fixedly installed on the foundation of the mountain 0 through a high-strength bolt, and both ends of each diagonal draw bar 14 are respectively connected with the connecting hinge base 12 and each connecting hinge base 12 on one side of the tower main body 11.
In this embodiment, the column base of the tower body 11 is fixed to the foundation of the mountain 0 by the anchor bolt 15.
In this embodiment, the basic bridges 31 at the ends of the folding bridges 3 have a width gradually decreasing or gradually increasing in the order of the hinges.
In this embodiment, the basic bridge 31 is a plate-shaped plate with two sides bent upwards, the cross section of the plate-shaped plate is "u" -shaped, a circular tube conveyor is mounted on the basic bridge 31, and a walking passage and an operation space for people, equipment and the like to move or operate are reserved on the basic bridge 31.
In this embodiment, as shown in fig. 3, the folding bridge 3 is composed of a first section of basic bridge 31, a second section of basic bridge 31, a third section of basic bridge 31, a fourth section of basic bridge 31, · and an nth section of basic bridge 31 (the n-stage telescopic bridge can be determined according to the span between two mountains).
In this embodiment, the method for installing the folding bridge device for the circular tube conveyor includes the following steps:
(1) a steel tower frame 1 is respectively built on the mountain tops of two sides, the steel tower frame 1 is fixed by ground anchor bolts, and the steel tower frame is fixed on a ground anchor box by diagonal draw bars, which specifically comprises the following steps: a tower body 11 is fixedly arranged on a mountain 0 foundation, one end of a diagonal draw bar 14 is connected with a connecting hinge base 12, and the other end of the diagonal draw bar is connected with the tower body 11, so that the tower 1 is fixed on the mountain 0 foundation;
(2) 2 winches 4, 2 hydraulic cylinders 5, a steel wire rope 6 and a pulley block 7 are respectively arranged on the mountain tops on two sides and flat ground for auxiliary installation;
(3) taking the tower 1, the connecting pull rod 2 and the folding bridge 3 for installing the folding bridge device for the circular tube conveyor on the left mountain head as an example, the left end of the folding bridge 3 is provided with a connecting hinged support 311, the connecting hinged support 311 and the connecting hinged support 12 at the bottom of the right side of the tower 1 are connected by a pin shaft, the right end of the folding bridge 3 is connected with a plurality of unextended basic bridges 31 under the folding state, at the moment, the basic bridges 31 are all in the unextended state, the right end of the folding bridge is drawn by a winch 4 through a steel wire rope 6, after the position is adjusted, the first section of the basic bridge 31 of the folding part is connected and fixed on the connecting hinged support 12 of the tower body 11 by the connecting pull rod 2, and then the drawn steel wire rope is released;
(4) the method comprises the steps of fixing a steel wire rope on a second basic bridge 31 connected with a first basic bridge 31 at the head end of a folding bridge 3, then rotating and opening the second basic bridge 31 folded on the first basic bridge 31 by taking a connecting hinge base 311 at the right end of the second basic bridge as a center through an auxiliary hydraulic cylinder 5, dragging the folding bridge 3 to be slowly placed in the horizontal direction through a pulley block 7 and a hoisting mechanism temporarily installed on a tower 1 when the folding bridge 3 is erected, installing the basic bridge 31 on the tower 1 through a connecting pull rod 2 after the installation angle of the second basic bridge 31 is adjusted, and sequentially operating a third basic bridge 31 and a fourth basic bridge 31 until the installation and debugging of the nth basic bridge 31 are completed.
(5) The last basic bridge 31 of the two mountain heads can meet in the middle of the mountain body 0 after being unfolded, the last basic bridge 31 of the folding bridge 3 connected with the towers 1 arranged on the two mountain bodies 0 is hinged after being unfolded, and the connecting hinge bases 311 at the ends of the basic bridge 31 are connected through pin shafts.
(6) After the bridge frames at the two sides are connected into a whole, finally, a truss is arranged on the bridge frame, and a circular pipe conveyor is arranged.
The foregoing is considered as illustrative of the preferred embodiments of the invention and is not to be construed as limiting the invention in any way. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention should fall within the protection scope of the technical scheme of the present invention, unless the technical spirit of the present invention departs from the content of the technical scheme of the present invention.
Claims (7)
1. A folding bridge device for a circular tube conveyor is characterized by comprising at least two towers (1) arranged on adjacent mountain bodies, a plurality of connecting pull rods (2) and two folding bridges (3) hinged with different towers (1), wherein the head ends of the folding bridges (3) are hinged with the towers (1), each folding bridge (3) comprises a plurality of basic bridges (31) hinged in sequence, the two ends of each connecting pull rod (2) are movably connected with the towers (1) and the basic bridges (31) of the folding bridges (3) hinged with the towers (1), and the two folding bridges (3) are hinged through the basic bridges (31) at the tail ends of the folding bridges (3); the two sides of the tower body (11) are provided with a plurality of connecting hinge bases (12) in a mirror image manner, the connecting hinge bases (12) are connected with the connecting hinge bases (12) on one side of the mountain leaning body of the tower (1) through diagonal draw bars (14) which are arranged in a matched manner, and the connecting hinge bases (12) on the other side of the tower (1) are respectively hinged with different connecting draw bars (2); the basic bridges (31) at the head end and the tail end of the folding bridges (3) are gradually reduced or increased in width according to the hinge sequence.
2. The folding bridge device for the circular pipe conveyor as claimed in claim 1, wherein the tower (1) comprises an H-shaped tower body (11) and a ground anchor assembly (13), each of the tower body (11) and the ground anchor assembly (13) is provided with a connecting hinge base (12), and the tower body (11) and the ground anchor assembly (13) are connected through the connecting hinge base (12) and then fixed on a mountain foundation.
3. The folding type bridge frame device for the circular pipe conveyor as claimed in claim 1, wherein the ground anchor assembly (13) is buried in the ground, the connecting hinge bases (12) are fixedly installed on a mountain foundation through high-strength bolts, and two ends of each diagonal draw bar (14) are respectively connected with the connecting hinge bases (12) and the connecting hinge bases (12) on one side of the tower body (11).
4. The folding bridge device for a circular pipe conveyor as claimed in claim 2, wherein the column base of the tower main body (11) is fixed to a mountain foundation by an earth anchor bolt (15).
5. The folding bridge device for circular tube conveyors as claimed in claim 1, wherein said basic bridge (31) is a plate-like plate bent upwards on both sides and having a "U" shaped cross-section, and said basic bridge (31) has coupling seats (311) at both ends, and two ends of adjacent basic bridges (31) are hinged by means of coupling seats (311).
6. Folding bridge device for circular tube conveyors according to claim 5, characterized in that the basic bridge (31) is further provided with a connecting rod hinge seat (312), said connecting rod hinge seat (312) being hinged with a coupling tie rod (2).
7. The method of installing a folding bridge apparatus for a round tube conveyor as claimed in claim 2, wherein the method of installing comprises the steps of:
step a), a tower body (11) is fixedly arranged on a mountain foundation, one end of a diagonal draw bar (14) is connected with a connecting hinge base (12), and the other end of the diagonal draw bar is connected with the tower body (11) so as to fix the tower (1) on the mountain foundation;
step b), a connecting hinged support (311) at the head end of a basic bridge (31) at the head end of a folding bridge (3) is connected with a connecting hinged support (12) at the bottom of one side, far away from a mountain, of a tower (1) through a pin shaft, a connecting rod hinged support (312) on the basic bridge (31) at the head end of the folding bridge (3) is pulled by a winch through a steel wire rope, after the placement angle of the folding bridge (3) is adjusted, the basic bridge (31) is connected to the connecting hinged support (12) of a tower main body (11) through a connecting pull rod (2), and then the pulled steel wire rope is released;
c) fixing a steel wire rope on a second section of basic bridge frame (31) connected with a first section of basic bridge frame (31) at the head end of the folding bridge frame (3), rotating and opening the second section of basic bridge frame (31) folded on the first section of basic bridge frame (31) by taking a connecting hinge base (311) at the folding end of the second section of basic bridge frame as a center through a hydraulic cylinder, dragging the folding bridge frame (3) to be slowly placed in the horizontal direction through a pulley block and a winding mechanism temporarily installed on the tower frame (1) when the folding bridge frame (3) is erected, and installing the basic bridge frame (31) on the tower frame (1) by using a connecting pull rod (2) after the installation angle of the second section of basic bridge frame (31) is adjusted;
step d) repeating the operation step c to install the subsequent basic bridge frame (31) until the installation and debugging of the nth section of basic bridge frame (31) are finished;
and e) repeating the steps a) to d) on the adjacent mountain bodies, unfolding the last section of basic bridge frame (31) of the folding bridge frame (3) connected with the towers (1) arranged on the two mountain bodies, then hinging the basic bridge frames with each other, and connecting the basic bridge frames through pin shafts at the ends of the basic bridge frames (31).
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911179086.8A CN111646101B (en) | 2019-11-27 | 2019-11-27 | Folding type bridge device for circular tube conveyor and installation method of folding type bridge device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911179086.8A CN111646101B (en) | 2019-11-27 | 2019-11-27 | Folding type bridge device for circular tube conveyor and installation method of folding type bridge device |
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| CN111646101A CN111646101A (en) | 2020-09-11 |
| CN111646101B true CN111646101B (en) | 2021-12-14 |
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| CN113550605A (en) * | 2021-08-13 | 2021-10-26 | 中冶天工集团有限公司 | Foldable fixed overhanging type discharging platform protection device and use method |
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| DE2244697C3 (en) * | 1972-09-12 | 1975-03-06 | Windmoeller & Hoelscher, 4540 Lengerich | Method and apparatus for manufacturing sacks with an inner sack with a Z-fold |
| US4245732A (en) * | 1979-06-29 | 1981-01-20 | Allis-Chalmers Canada, Limited | Compactly foldable radial luffing stacker |
| DE3216505A1 (en) * | 1982-05-03 | 1983-11-03 | Windmöller & Hölscher, 4540 Lengerich | DEVICE FOR THE Z-SHAPED FOLDING OF PAPER BAGS |
| AT390775B (en) * | 1985-02-28 | 1990-06-25 | Bernegger Bau Ges M B H | BELT CONVEYOR |
| EP0637556B1 (en) * | 1993-08-05 | 1997-12-03 | Bridgestone Corporation | Tubular belt conveyor |
| EP1270490B1 (en) * | 2001-06-29 | 2009-11-11 | Inventio Ag | Construction for long span escalator or moving walkway |
| CN101451340A (en) * | 2007-12-03 | 2009-06-10 | 湖北华舟有限责任公司 | Mechanically-actuated folding trestle |
| CN204150581U (en) * | 2014-08-25 | 2015-02-11 | 安徽理工大学 | The scalable pipe conveyer of a kind of downhole crossheading |
| CN105565176B (en) * | 2016-02-03 | 2017-06-13 | 中铁港航局集团有限公司 | A kind of asymmetric cable crane of single column |
| CN105735103B (en) * | 2016-04-25 | 2018-07-27 | 武汉雷神特种器材有限公司 | Portable quick installation can dismantle bridge on foot |
| CN205591098U (en) * | 2016-04-25 | 2016-09-21 | 武汉雷神特种器材有限公司 | Portable quick installation can dismantle bridge on foot |
| CN206679728U (en) * | 2017-03-20 | 2017-11-28 | 深圳市慈能自动化设备有限公司 | A kind of housing assembly of Extensible belt conveyor |
| US10843873B1 (en) * | 2017-11-15 | 2020-11-24 | Flsmidth A/S | Conveyor apparatus |
| CN209162619U (en) * | 2018-10-29 | 2019-07-26 | 陈来旺 | Ultralow across road bascule bridge |
| CN109928139B (en) * | 2019-04-24 | 2024-05-24 | 焦作科瑞森重装股份有限公司 | Large-span suspension bridge circular tube belt conveyor |
| CN111807232A (en) * | 2020-07-22 | 2020-10-23 | 重庆交通建设(集团)有限责任公司 | Cable crane system and hoisting method |
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