CN110565502B - Folding bridge and application method thereof - Google Patents
Folding bridge and application method thereof Download PDFInfo
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- CN110565502B CN110565502B CN201910872279.5A CN201910872279A CN110565502B CN 110565502 B CN110565502 B CN 110565502B CN 201910872279 A CN201910872279 A CN 201910872279A CN 110565502 B CN110565502 B CN 110565502B
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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
- E01D15/00—Movable or portable bridges; Floating bridges
- E01D15/12—Portable or sectional bridges
- E01D15/124—Folding or telescopic bridges; Bridges built up from folding or telescopic sections
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Abstract
The invention discloses a folding bridge and a use method thereof, wherein the folding bridge comprises at least two bridge units, each bridge unit comprises a supporting table, a plurality of supporting piers are arranged on the supporting table, and each supporting pier can slide along the supporting table; the upper end face of each supporting pier is provided with a main girder, each main girder is hinged with two bridge panels, the bridge panels between two adjacent supporting piers are hinged, the bridge panels on the outer sides of the two supporting piers at the two ends of the supporting table are connected to a main tower through slings, and the main tower is fixed on the supporting table; when two adjacent support piers are close, the two adjacent bridge decks are folded; when two adjacent support piers are far away, the two adjacent bridge decks are unfolded; when the bridge decks of two adjacent bridge units are unfolded, the bridge decks between the two adjacent bridge units are butted. The invention can improve the traffic capacity of the campus landscape space and avoid traffic jam; the separation and passing of the upward people and the motor vehicles on the road around the landscape are realized, and the traffic accidents are prevented.
Description
Technical Field
The invention belongs to the technical field of traffic bridges, and particularly relates to a folding bridge and a using method thereof.
Background
The campus landscape space is not only an important place for the leisure, social contact and study of teachers and students of schools, but also a carrier for campus culture of schools. Along with the transformation of education ideas and the diversification of the needs of teachers and students, the campus landscape space design quality is more and more important, and the campus landscape planning is more and more focused on the humanized needs of teachers and students in the school in terms of the development trend of the current campus planning. In addition, because the artificial lake has the advantages of beautifying the environment, adjusting microclimate and the like, the campus landscape space often plans a certain area of lake surface space.
The campus landscape space belongs to a resident space, the road design of the campus landscape space usually places accessibility in a secondary position, the internal road is more narrow and tortuous, the walking time is prolonged, the traffic capacity is reduced, the activities of teachers and students in the campus have the characteristics of collective and regularity, the traffic flow of people in the peak period of going up and down the lessons is relatively large, at the moment, the campus landscape space often influences the large-scale collective travel of teachers and students, traffic jam is caused, and the traffic pressure is high; the roads around the landscape are often roadway, so that the mixed running condition of people and vehicles often occurs, and certain potential safety hazards exist.
Disclosure of Invention
Aiming at the technical problems in the prior art, the invention provides the folding bridge and the use method thereof, which can improve the traffic capacity of the campus landscape space, and can avoid causing traffic jam and relieve traffic pressure when the traffic volume of people in peak period is relatively large; the separation and passing of the upward people and the motor vehicles on the road around the landscape are realized, and the traffic accidents are prevented.
In order to solve the technical problems, the invention is solved by the following technical scheme:
the folding bridge comprises at least two bridge units, wherein each bridge unit comprises a supporting table, a plurality of supporting piers are arranged on the supporting table, and each supporting pier can slide along the supporting table; the upper end face of each supporting pier is provided with a main beam, each main beam is hinged with two bridge panels, the bridge panels between two adjacent supporting piers are hinged, the bridge panels positioned on the outer sides of the two supporting piers at the two ends of the supporting table are connected to a main tower through slings, and the main tower is fixed on the supporting table;
when two adjacent support piers are close, the two adjacent bridge decks are folded; when two adjacent support piers are far away, the two adjacent bridge decks are unfolded;
when the bridge decks of two adjacent bridge units are unfolded, the bridge decks between the two adjacent bridge units are butted.
Further, a sliding groove is formed in the supporting table, the lower end of each supporting pier extends into the sliding groove, and pulleys matched with the sliding grooves are arranged on the lower end face of each supporting pier.
Further, the cross section of the supporting table is in a sector shape, and the sliding groove is formed in the direction of a sector arc.
Further, the main tower is arranged on a connecting line of the midpoint of the circular arc of the sector and the center of the sector.
Further, the bridge deck between two adjacent support piers is hinged by a hinge shaft.
Further, a driving device for driving the support piers to slide is arranged between every two adjacent support piers.
Further, the driving device is a hydraulic machine, and the hydraulic machine is fixed on the supporting table; the telescopic rod end of the hydraulic machine is hinged with one end of two connecting rods, the other end of one connecting rod is hinged with one supporting pier, and the other end of the other connecting rod is hinged with the other supporting pier;
when the telescopic rod of the hydraulic machine extends out, the connecting rods drive the two adjacent supporting piers to be far away, and the two adjacent bridge decks are unfolded; when the telescopic rod of the hydraulic machine is retracted, the connecting rods drive the adjacent two supporting piers to approach, and the adjacent two bridge decks are folded.
Further, a bench ladder is further arranged on the supporting bench, the bottom of the bench ladder is fixedly connected with the supporting bench, and the top of the bench ladder extends to the bridge deck.
Further, the girder is the I-steel, and the up end of supporting mound and the lower terminal surface fixed connection of I-steel, one side of decking articulates the up end at the I-steel.
The application method of the folding bridge comprises the following steps: when the bridge deck is required to be used, the driving device is controlled to drive the adjacent supporting piers to be away from each other, and the supporting piers drive the bridge deck to be unfolded; after the bridge deck is used, the driving device is controlled to drive the adjacent supporting piers to approach each other, and the supporting piers drive the bridge deck to fold.
Compared with the prior art, the invention has at least the following beneficial effects: the invention relates to a folding bridge, which is characterized in that at least two bridge units are arranged in resident space places such as campus landscape space, and particularly each bridge unit comprises a supporting table, a plurality of supporting piers are arranged on the supporting table, each supporting pier can slide along the supporting table, a main beam is arranged on the upper end face of each supporting pier, two bridge panels are hinged on each main beam, bridge panels between two adjacent supporting piers are hinged, the bridge panels on the outer sides of the two supporting piers at the two ends of the supporting table are connected to a main tower through slings, the main tower is fixed on the supporting table, and the slings play a role in reinforcing the bridge. The structural design can realize folding and unfolding of the bridge: when the traffic volume of people in peak period is relatively large, the adjacent two support piers are controlled to be far away from each other, so that the bridge deck plates hinged on the main beams on the support piers are unfolded along with the distance of the support piers, and when the bridge deck plates of the adjacent two bridge units are unfolded, the bridge deck plates between the adjacent two bridge units are butted, so that pedestrians can pass through quickly, traffic jam can be avoided, traffic pressure is relieved, separation and passing of upward people and motor vehicles on roads around landscapes are realized, and traffic accidents are prevented; in other time periods, the adjacent two support piers are controlled to be close to each other, so that the bridge deck plate hinged to the main beam on the support piers is folded along with the distance of the support piers, the folded lower space of the bridge deck plate can be used for designing a shielded rest place, namely a building ash space in an outdoor park, and matched facilities can be arranged according to requirements. The folding bridge is formed by combining a plurality of bridge units with small spans, and can be spliced according to the span requirements of different places, so that the usability and practicability of the bridge are greatly improved; building small products are formed when the sparser period of the personnel is closed, the bridge is integrated into the landscape, and corresponding functionality is provided according to the requirements of each university by utilizing the space formed after folding, so that the residence function of the landscape space is effectively improved.
Further, the supporting table is provided with the sliding groove, the lower end of each supporting pier extends into the sliding groove, the lower end face of each supporting pier is provided with the pulley matched with the sliding groove, sliding of the supporting pier is realized through the cooperation of the pulley sliding groove, friction between the supporting pier and the supporting table when the bridge is unfolded and folded can be effectively reduced, smooth sliding of the bridge supporting pier is realized, and the service life of the bridge is prolonged.
Further, the cross section of the supporting table is fan-shaped, the sliding groove is formed in the direction of the fan-shaped circular arc, so that the main beam of the folding bridge can complete the opening and closing process along a small radius, the occupied area of the folding bridge in a crowd-intensive area or a park is reduced, and the influence of opening and closing of the bridge on the surrounding environment is reduced to the minimum.
Further, the main tower is arranged on the connecting line of the midpoint of the fan-shaped circular arc and the center of the fan-shaped circular arc, and in the opening and closing process of the main beam, the stay cable and the main beam are always kept in the same plane, and the stress state of the stay cable is not greatly changed along with the movement of the beam, so that the stability of force transmission and the reliability of the whole structure are ensured, the occupied area of the folding bridge can be further reduced, the folding bridge and the bridge pier can share the foundation, and the whole bridge is stronger in integrity.
Further, the bridge deck plates between two adjacent supporting piers are hinged through the hinge shaft, so that the structure is simple, the installation is convenient, and the construction is easy.
Further, the driving device is a hydraulic machine, the hydraulic machine is fixed on the supporting table, when the telescopic rod of the hydraulic machine extends out, the adjacent two supporting piers are driven to be far away by the connecting rod, and the adjacent two bridge decks are unfolded; when the telescopic rod of the hydraulic machine is retracted, the connecting rods drive the adjacent two supporting piers to approach, and the adjacent two bridge panels are folded, so that the expansion and folding of the bridge can be conveniently controlled.
Further, be provided with the bench ladder on the brace table, the bottom and the brace table fixed connection of bench ladder, the top stretches to the decking, makes things convenient for the pedestrian to step on the decking through the bench body.
In order to make the above objects, features and advantages of the present invention more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a front view of the deck structure of the present invention after folding;
FIG. 2 is a front view of the deck structure of the present invention after deployment;
FIG. 3 is a front view of the deployed full bridge configuration of the present invention;
FIG. 4 is a top view of the deployed full bridge construction of the present invention;
FIG. 5 is a left side view of the deployed full bridge configuration of the present invention;
fig. 6 is a front view of the folded full bridge construction of the present invention.
FIG. 7 is a top view of the folded full bridge construction of the present invention;
FIG. 8 is a left side view of the folded full bridge construction of the present invention;
FIG. 9 is a front view of the folding power system in an unfolded state;
FIG. 10 is a top view of the folding power system in an unfolded state;
FIG. 11 is a front view of the folding power system in a closed state;
fig. 12 is a top view of the folding power system in a closed state.
In the figure: 1-a main beam; 2-supporting piers; 3-bridge deck; 4-hinge shaft; 5-slings; 6-a main tower; 7-supporting the platform; 8-a chute; 9-step ladder; 10-a driving device; 11-connecting rod.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
As a preferred embodiment of the present invention, the folding bridge of the present invention comprises at least two bridge units, as shown in fig. 3 to 8, each bridge unit comprises a supporting table 7, a plurality of supporting piers 2 are disposed on the supporting table 7, and each supporting pier 2 can slide along the supporting table 7, preferably, the cross section of the supporting table 7 has a sector shape with an angle of 90 °. The concrete structural design of the support piers 2 sliding along the support table 7 is shown in fig. 4 and 7, a chute 8 is formed in the support table 7, the chute 8 is formed along the direction of a fan-shaped circular arc, the lower end of each support pier 2 extends into the chute 8, and pulleys matched with the chute 8 are arranged on the lower end face of each support pier 2.
As shown in fig. 3 to 8, the upper end face of each supporting pier 2 is fixedly connected with a girder 1, each girder 1 is hinged with two bridge panels 3, the bridge panels 3 between two adjacent supporting piers 2 are hinged, specifically, the girder 1 is i-steel, the upper end face of each supporting pier 2 is fixedly connected with the lower end face of the i-steel, and one side of each bridge panel 3 is hinged with the upper end face of the i-steel; the bridge deck 3 between two adjacent support piers 2 is hinged by a hinge shaft 4, the hinge shaft 4 being similar to a hinge connecting a door frame to a door leaf. A main tower 6 is fixedly arranged on the supporting table 7, and bridge decks 3 positioned on the outer sides of the two supporting piers 2 at the two ends of the supporting table 7 are connected to the main tower 6 through slings 5. Preferably, as shown in fig. 4 and 7, the main tower 6 is arranged on the connection line between the midpoint of the circular arc of the sector and the center of the sector. Still be provided with a step 9 on supporting bench 7, the bottom and the supporting bench 7 fixed connection of step 9, the top stretches to deck slab 3, when the bridge floor is expanded, the pedestrian climbs the bridge floor through a step 9.
A driving device 10 for driving the support piers 2 to slide is arranged between two adjacent support piers 2, specifically, as shown in fig. 9 to 12, the driving device 10 is a hydraulic machine, the hydraulic machine is fixed on the support table 7, the telescopic rod end of the hydraulic machine is hinged with one end of two connecting rods 11, the other end of one connecting rod 11 is hinged with one support pier 2, and the other end of the other connecting rod 11 is hinged with the other support pier 2.
As shown in fig. 9 and 10, when the telescopic rod of the hydraulic machine is extended, the telescopic rod drives the adjacent two support piers 2 to be far away through the connecting rod 11, and the adjacent two bridge decks 3 are unfolded to form a bridge deck for pedestrians to pass through. As shown in fig. 11 and 12, when the telescopic link of the hydraulic machine is retracted, the telescopic link drives the adjacent two support piers 2 to approach each other through the connecting rod 11, and the adjacent two bridge decks 3 are folded.
When the bridge disclosed by the invention is required to be used, the telescopic rods of the driving device 10 are controlled to extend, so that the adjacent supporting piers 2 are driven to slide away along the sliding grooves 8, the supporting piers 2 can be driven to be away from each other, the bridge deck panels 3 can be unfolded to form a bridge deck, and the bridge deck panels 3 between the two adjacent bridge units can be completely butted after being unfolded to form a bridge crossing the water surface.
After the use is completed, the telescopic rod of the driving device 10 is controlled to retract, so that the adjacent support piers 2 are driven to slide along the sliding groove 8 to approach, the approach of the support piers 2 can drive the bridge deck 3 to fold, and the two bridge deck 3 hinged between the two adjacent support piers 2 through the hinge shaft 4 are folded upwards.
In a certain preferred embodiment of the invention:
the girder 1 adopts a steel girder as a cantilever beam to support the bridge deck 3, and two steel girders on the most side are suspended to the top of the main tower 6 by steel ropes. The embodiment comprises four bridge units, each bridge unit comprises nine bridge decks 3, wherein the bridge decks 3 can be folded upwards at the steel main beams and can be folded downwards at the hinge shafts 4. The expansion and folding of the bridge adopt an electric hydraulic rod as a power device, the power device is arranged on the supporting table 7, and the model YTZ1000-/110 electrohydraulic push rod is suitable for reciprocating push-pull linear motion, can provide 1000kgf thrust and 750kgf pulling force, and meets the structural stress requirement.
In the embodiment, the bridge decks 3 have different lengths, stay ropes are adopted at the longest beam to assist in stress, the rest beams are single cantilever beams, shan Qiaochang m, and the lengths of the bridge decks 3 of the four bridge units after being unfolded, combined and spliced are 62m. The bridge deck 3 is made of steel plate and has a thickness of 20mm.
The main tower 6 is 6m high, the section of the main body stress member is cylindrical, the steel pipe concrete material is adopted, the cable tower is C50 micro-expansion concrete, the core concrete is subjected to circumferential prestress through the steel pipe, the external modeling is a spiral rising geometric body splicing modeling, and the main body stress member is shielded outside the cylindrical through a thin steel plate and does not participate in stress.
The diameter of the inhaul cable is 45mm, the inhaul cable is made of 1860 steel strands, and the elastic die is 1.95x10 8 kN/m2, poisson's ratio 0.3, linear expansion coefficient 1.2x10 -5 1/[C]Weighing 78.5kN/m 3 Damping ratio 0.02. The inhaul cable is arranged on the outer side of the longest beam, so that the bridge deck clearance is not influenced, and no negative effect is caused to pedestrian traffic.
The girder 1 adopts I-shaped girder steel, and rib plates at the section change place are thickened to meet the stress requirement of larger bending moment.
The foundation for bridge installation adopts bored piles, and 2x2 = 4 piles are totally adopted, the pile length is 14m, the pile diameter is 0.8m, the pile center distance is 2.5m in the longitudinal bridge direction, and the transverse bridge direction is 2.5m. The supporting table 7 is 2m thick, 4.5m wide along the bridge and 4.5m wide across the bridge.
The cable-stayed cantilever combined system bridge of the embodiment is a combined system formed by a high-strength steel cable (inhaul cable), a main tower and a main girder. The outer longest girder is suspended by the stay cables led out from the tower columns, and the stay cables provide multi-point elastic support, so that the bending moment and deflection of the girder are obviously reduced, and the bridge crossing capacity is improved. Meanwhile, the building height is small, the girder is light, the clearance requirement under the bridge can be fully met, the bridge is attractive, the stress is reasonable, the horizontal component force of the inclined cable pulling force provides the girder with pre-cast height, and the deformation resistance of the girder can be improved.
The construction method of the embodiment is as follows:
1. and (3) construction of a steel pile foundation:
measuring and positioning paying-off, installing a pile machine, moving the pile machine into position, hanging piles, inserting piles, hammering and sinking, pile splicing, hammering to a designed depth, internally cutting steel piles, finely cutting, and wearing caps
2. And (3) constructing a bridge main body:
the method comprises the steps of power device setting-steel tube concrete tower column construction-temporary support erection-steel truss transportation-cantilever beam hoisting-bridge deck assembly (including parameterized slab shell assembly) and temporary support dismantling.
Of course, the invention can also be applied to urban construction, and due to the standardization of components and structural integrity and the smaller unfolding path and occupation area caused by the special structure, the invention can be excellently hidden in urban buildings, thereby better solving the problems of high limit of road traffic and transportation, blocking of driver sight and the like caused by lower height of a pedestrian overpass in the city.
Specifically, in urban construction, the design needs to be solved firstly, namely functional organization and traffic planning. Based on the structural characteristics of the foldable bridge, the foldable bridge has at least two functional properties of both business and traffic in the big data age, greatly reduces the complexity of urban functional organization and traffic planning, can effectively coordinate potential contradictions existing between the two, realizes multifunctional composite application of urban space (such as application of peak staggering travel in different time periods, and the like), improves urban efficiency, and is beneficial to the development of toughness cities.
In the future commercialized operation popularization, for large-scale and numerous business complexes, the business layout and the line planning are more complex and more important. Therefore, the foldable bridge with composite functions and flexible elasticity has quite sufficient development potential around the periphery of urban commercial complexes and the like with similar functions. Moreover, the particularity of the working principle of the foldable bridge can make the foldable bridge become a unique landscape in the city, which has a great promotion effect on the functions of commercial synthesis (or similar functional areas) business and the like, and has huge commercial value under the function radiation of the commercial synthesis.
Finally, it should be noted that: the above examples are only specific embodiments of the present invention, and are not intended to limit the scope of the present invention, but it should be understood by those skilled in the art that the present invention is not limited thereto, and that the present invention is described in detail with reference to the foregoing examples: any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or perform equivalent substitution of some of the technical features, while remaining within the technical scope of the present disclosure; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention, and are intended to be included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A folding bridge, characterized in that: the bridge comprises at least two bridge units, wherein each bridge unit comprises a supporting table (7), a plurality of supporting piers (2) are arranged on the supporting table (7), and each supporting pier (2) can slide along the supporting table (7); the upper end face of each supporting pier (2) is provided with a main beam (1), each main beam (1) is hinged with two bridge panels (3), the bridge panels (3) between two adjacent supporting piers (2) are hinged, the bridge panels (3) positioned on the outer sides of the two supporting piers (2) at the two ends of the supporting table (7) are connected to a main tower (6) through slings (5), and the main tower (6) is fixed on the supporting table (7);
when two adjacent support piers (2) are close, the two adjacent bridge decks (3) are folded; when two adjacent supporting piers (2) are far away, the two adjacent bridge decks (3) are unfolded;
when the bridge decks (3) of two adjacent bridge units are unfolded, the bridge decks (3) between the two adjacent bridge units are butted;
a sliding groove (8) is formed in the supporting table (7), the lower end of each supporting pier (2) extends into the sliding groove (8), and pulleys matched with the sliding groove (8) are arranged on the lower end face of each supporting pier (2);
a driving device (10) for driving the support piers (2) to slide is arranged between two adjacent support piers (2).
2. A folding bridge according to claim 1, characterized in that: the cross section of the supporting table (7) is in a sector shape, and the sliding groove (8) is formed in the direction of a sector arc.
3. A folding bridge according to claim 2, characterized in that: the main tower (6) is arranged on a connecting line of the midpoint of the circular arc of the fan shape and the center of the circle of the fan shape.
4. A folding bridge according to claim 1, characterized in that: the bridge deck (3) between two adjacent supporting piers (2) is hinged through a hinge shaft (4).
5. A folding bridge according to claim 1, characterized in that: the driving device (10) is a hydraulic machine, and the hydraulic machine is fixed on the supporting table (7); the telescopic rod end of the hydraulic machine is hinged with one end of two connecting rods (11), the other end of one connecting rod (11) is hinged with one supporting pier (2), and the other end of the other connecting rod (11) is hinged with the other supporting pier (2);
when the telescopic rod of the hydraulic machine stretches out, the adjacent two supporting piers (2) are driven to be far away by the connecting rod (11), and the adjacent two bridge decks (3) are unfolded; when the telescopic rod of the hydraulic machine is retracted, the connecting rod (11) drives the adjacent two supporting piers (2) to approach, and the adjacent two bridge decks (3) are folded.
6. A folding bridge according to claim 1, characterized in that: the support bench (7) is further provided with a bench ladder (9), the bottom of the bench ladder (9) is fixedly connected with the support bench (7), and the top of the bench ladder extends to the bridge deck (3).
7. A folding bridge according to claim 1, characterized in that: the girder (1) is I-steel, the upper end face of the supporting pier (2) is fixedly connected with the lower end face of the I-steel, and one side of the bridge deck (3) is hinged to the upper end face of the I-steel.
8. A method of using a folding bridge according to any one of claims 1 to 7, characterized in that: when the bridge deck is required to be used, the driving device (10) is controlled to drive the adjacent supporting piers (2) to be away from each other, and the supporting piers (2) drive the bridge deck (3) to be unfolded; after the use is finished, the driving device (10) is controlled to drive the adjacent supporting piers (2) to approach each other, and the supporting piers (2) drive the bridge deck (3) to fold.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910872279.5A CN110565502B (en) | 2019-09-16 | 2019-09-16 | Folding bridge and application method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910872279.5A CN110565502B (en) | 2019-09-16 | 2019-09-16 | Folding bridge and application method thereof |
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| CN110565502A CN110565502A (en) | 2019-12-13 |
| CN110565502B true CN110565502B (en) | 2024-04-12 |
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| CN210946448U (en) * | 2019-09-16 | 2020-07-07 | 长安大学 | A bridge that unfolds and folds |
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| DE10242860B3 (en) * | 2002-09-14 | 2004-01-22 | Dornier Gmbh | Removable bridge |
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| JP2015137451A (en) * | 2014-01-20 | 2015-07-30 | 東亜建設工業株式会社 | Movable pier |
| RU2578231C1 (en) * | 2014-12-17 | 2016-03-27 | Пахомов Дмитрий Николаевич | Collapsible universal bridge |
| CN206736700U (en) * | 2017-05-27 | 2017-12-12 | 云南公投建设集团隧道工程有限公司 | mobile telescopic bridge |
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| Publication number | Publication date |
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| CN110565502A (en) | 2019-12-13 |
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