CN112376392A - Suspension type monorail pier beam consolidation type beam bridge - Google Patents
Suspension type monorail pier beam consolidation type beam bridge Download PDFInfo
- Publication number
- CN112376392A CN112376392A CN202011399916.0A CN202011399916A CN112376392A CN 112376392 A CN112376392 A CN 112376392A CN 202011399916 A CN202011399916 A CN 202011399916A CN 112376392 A CN112376392 A CN 112376392A
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- pier
- bridge
- track
- truss
- suspended monorail
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/08—Tracks for mono-rails with centre of gravity of vehicle above the load-bearing rail
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B25/00—Tracks for special kinds of railways
- E01B25/22—Tracks for railways with the vehicle suspended from rigid supporting rails
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D6/00—Truss-type bridges
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- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Mechanical Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The embodiment of the application provides a single track mound roof beam of suspension type concreties formula girder bridge, includes: a plurality of truss structures and a plurality of piers; each truss structure comprises a main truss and a track beam assembly, the main truss comprises an upper chord member, a lower chord member and a plurality of web members, the track beam assembly comprises a track beam, the web members are connected with the upper chord member and the lower chord member, the track beam assembly is connected with the upper chord member, and the track beam is positioned on the side edge of the upper chord member; and one truss structure is arranged between every two adjacent piers respectively, and the main truss of each truss structure is rigidly connected with the corresponding pier respectively. The suspended monorail pier beam consolidation type beam bridge provided by the embodiment of the application can greatly improve spanning capacity, and further can meet the requirement of spanning large spans at control nodes such as high-grade roads and rivers.
Description
Technical Field
The utility model relates to an urban rail transit field especially relates to a suspension type single track mound roof beam concreties formula girder bridge.
Background
In the related art, the section of a track beam of a suspended monorail girder bridge is an open thin-wall box-shaped section, the box-shaped section is formed by enclosing a top plate, a web plate and a bottom plate, wherein the bottom plate comprises a left steel plate and a right steel plate, an opening is formed between the two steel plates, and a train bogie is arranged in the track beam and is connected with a train body of a suspended monorail train through the opening between the left steel plate and the right steel plate.
However, because the track beam adopts a structural form with a thin wall and an opening at the bottom, the torsional rigidity of the track beam is relatively small, and the track beam is subjected to large torque and is easy to deform under the action of train load, wind load and the like, so that the applicable span range of the track beam is severely limited, and when the suspension type monorail beam bridge needs to span controlled nodes such as high-grade roads, rivers and the like, the spanning capacity of the suspension type monorail beam bridge cannot meet the requirement of the controlled nodes on the large span of the bridge span structure.
Disclosure of Invention
In view of the above, it is desirable to provide a suspended monorail pier-beam consolidated beam bridge capable of improving spanning capability.
To achieve the above object, the present application provides a suspended monorail pier beam consolidation type beam bridge, which includes:
the truss structure comprises a plurality of truss structures, each truss structure comprises a main truss and a track beam assembly, the main truss comprises an upper chord, a lower chord and a plurality of web members, the track beam assembly comprises a track beam, the web members are connected with the upper chord and the lower chord, the track beam assembly is connected with the upper chord, and the track beam is positioned on the side edge of the upper chord;
the bridge comprises a plurality of bridge piers, wherein one truss structure is arranged between every two adjacent bridge piers, and the main truss of each truss structure is respectively and rigidly connected with the corresponding bridge pier.
In one embodiment, the track beam assembly further comprises a plurality of first cross beams, the first cross beams are arranged at intervals along the extending direction of the suspended monorail pier beam consolidation type beam bridge, one end of each first cross beam is connected with the upper chord, and the other end of each first cross beam is connected with the track beam.
In one embodiment, the number of the track beams is two, and the two track beams are respectively arranged on two sides of the upper chord.
In one embodiment, the track beam assembly further comprises two second cross beams;
each end of the two opposite ends of the upper chord along the extending direction is respectively connected with one second cross beam, and each second cross beam is respectively connected with the track beam.
In one embodiment, each second cross beam is rigidly connected to the top end surface of the corresponding pier.
In an embodiment, the main truss further includes at least two support rods, at least one support rod is disposed at each of two opposite ends of the lower chord along the extending direction, the top end of each support rod is rigidly connected to the lower chord, and the bottom end of each support rod is rigidly connected to the corresponding bridge pier.
In one embodiment, each of two opposite ends of the lower chord along the extending direction is provided with one support rod, the top end of the web member closest to the pier is rigidly connected with the corresponding pier, and the bottom end of the web member closest to the pier is connected with the top end of the corresponding support rod.
In one embodiment, the main truss is formed by splicing a plurality of truss sections, and the length of each truss section is 15-30 m; and/or the presence of a gas in the gas,
the track beam is formed by splicing a plurality of track beam sections, and the length of each track beam section is 15-30 m.
In one embodiment, the track beam comprises a box body, and a web plate and a plurality of diaphragm plates which are arranged in the box body;
the web is connected with the bottom wall of the box body and the top wall of the box body so as to divide the box body into two chambers, the two chambers are respectively a first chamber and a second chamber, and the first chamber is positioned on one side of the second chamber close to the main truss;
the diaphragm plates are arranged in the first chamber and are arranged at intervals along the extending direction of the suspended monorail pier-beam consolidated beam bridge, and each diaphragm plate is connected with the inner wall of the first chamber;
an opening is formed in the bottom wall of the second chamber, the opening extends along the extending direction of the suspended monorail pier beam consolidation type beam bridge, and the bottom wall of the second chamber is located on the inner surfaces of two sides of the opening to form a walking surface.
In one embodiment, the track beam further comprises a plurality of first reinforcing plates, and the plurality of first reinforcing plates are arranged on one side of the box body, which faces away from the main truss, and are arranged at intervals along the extending direction of the suspended monorail pier beam consolidated beam bridge; and/or the presence of a gas in the gas,
the track beam also comprises a plurality of second reinforcing plates, and the second reinforcing plates are arranged on the outer surface of the top wall of the box body and are arranged at intervals along the extending direction of the suspended monorail pier beam consolidation type beam bridge; and/or the presence of a gas in the gas,
the track roof beam still includes a plurality of third reinforcing plates, and is a plurality of the third reinforcing plate sets up the surface of the diapire of box just follows the extending direction interval of suspension type monorail pier beam concretion formula girder bridge sets up.
The embodiment of the application provides a single track mound roof beam of suspension type concreties formula girder bridge, through being connected track girder assembly and last chord member, with main truss and pier rigid connection that corresponds, not only can greatly improve the torsional rigidity of track roof beam, can also improve single track mound roof beam of suspension type concreties the whole rigidity and the stability of formula girder bridge, therefore, can increase the single track mound roof beam of suspension type concreties the span of formula girder bridge to more than 80m, thereby greatly improved the leap ability of single track mound roof beam of suspension type concreties formula girder bridge, and then can satisfy and stride across high-grade road, the large-span demand of controllability nodes such as river.
Drawings
Fig. 1 is a schematic structural view of a suspended monorail pier-beam consolidated beam bridge according to an embodiment of the application;
FIG. 2 is a schematic top view of the suspended monorail pier-beam consolidated bridge shown in FIG. 1;
fig. 3 is a schematic view illustrating a connection relationship between a main girder and a pier shown in fig. 1, in which a girder assembly is omitted;
fig. 4 is a view taken along direction a of fig. 2.
Description of the reference numerals
A truss structure 100; a main girder 110; an upper chord 111; a lower chord 112; a web member 113; a support bar 114; a rail beam assembly 120; a rail beam 121; a case 1211; a first chamber 1211 a; a second chamber 1211 b; an opening 1211 c; a running surface 1211 d; a web 1212; a bulkhead 1213; a first reinforcing plate 1214; a second reinforcement panel 1215; a third stiffener plate 1216; a first cross member 122; a second cross member 123; and a bridge pier 200.
Detailed Description
It should be noted that, in the present application, technical features in examples and embodiments may be combined with each other without conflict, and the detailed description in the specific embodiment should be understood as an explanation of the gist of the present application and should not be construed as an improper limitation to the present application.
In the description of the present application, the "extending direction," "lateral," "top," "bottom" orientation or positional relationship is based on the orientation or positional relationship shown in fig. 1, it being understood that such orientation terms are merely for convenience in describing the present application and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be considered limiting of the present application.
An embodiment of the present application provides a suspended monorail pier-girder consolidation type girder bridge, please refer to fig. 1 to 3, which includes a plurality of truss structures 100 and a plurality of piers 200, each truss structure 100 includes a main truss 110 and a rail girder assembly 120, the main truss 110 includes an upper chord 111, a lower chord 112 and a plurality of web members 113, the rail girder assembly 120 includes a rail girder 121, the plurality of web members 113 connect the upper chord 111 and the lower chord 112, the rail girder assembly 120 is connected to the upper chord 111, and the rail girder 121 is located at a side of the upper chord 111; a truss structure 100 is respectively arranged between every two adjacent bridge piers 200, and the main truss 110 of each truss structure 100 is respectively and rigidly connected with the corresponding bridge pier 200.
In the related art, the span of the suspended monorail girder bridge is limited by the torsional rigidity of the track girder and generally does not exceed 30m, and the span is difficult to meet the requirement of large span for spanning control nodes such as high-grade roads, rivers and the like.
The track beam assembly 120 of the embodiment of the application can form a stressed whole with the main truss 110 by being connected with the upper chord 111, and the stressed whole can bear external loads such as train loads, wind loads and the like together, so that the torsional rigidity of the track beam 121 can be greatly improved, when the span of the track beam 121 is large, the track beam 121 can also have good deformation resistance, and the main truss 110 can form a pier beam consolidation system by being rigidly connected with the corresponding pier 200, so that the overall rigidity and stability of the suspended monorail pier beam consolidation type beam bridge can be improved. The utility model provides a single track mound roof beam bridge of suspension type concreties formula girder bridge is through being connected track girder assembly 120 and upper chord 111, with main truss 110 and 200 rigid connection of pier that correspond, can make single track mound roof beam bridge of suspension type concreties the span of formula girder bridge and can reach more than 80m, compare with the single track girder bridge of suspension type that traditional span is no longer than 30m, the single track mound roof beam bridge of suspension type of this application embodiment has greatly improved the leap ability, and then can satisfy and stride across high-grade road, the large-span demand of controllability nodes such as river.
In addition, because the torsional rigidity of the track beam 121 is greatly improved, the suspended monorail pier beam consolidation type beam bridge provided by the embodiment of the application can also improve the comfort and the smoothness of the suspended monorail train during operation.
The suspended monorail pier-beam consolidation type beam bridge provided by the embodiment of the application is simple in structure, clear in stress and good in landscape effect.
In an embodiment, the pier 200 may be made of a steel structure, and the pier 200, the main girder 110, and the rail girder 121 may be manufactured in a factory in a unified manner, thereby improving the accuracy of machining and installation.
In some embodiments, the pier 200 may also be constructed of reinforced concrete.
For convenience of transportation, the main truss 110 may be divided into a plurality of truss segments, each of which has a length of 15 to 30m, and the plurality of truss segments may be manufactured in a factory and assembled at a construction site.
Similarly, the track beam 121 may be divided into a plurality of track beam segments each having a length of 15m to 30m, and the plurality of track beam segments may be manufactured in a factory and assembled at a construction site.
In one embodiment, referring to fig. 1 and 2, the track beam assembly 120 further includes a plurality of first cross beams 122, the plurality of first cross beams 122 are disposed at intervals along the extending direction of the suspended monorail pier-beam consolidated beam bridge, one end of each first cross beam 122 is connected to the upper chord 111, and the other end of each first cross beam 122 is connected to the track beam 121. The plurality of first cross beams 122 arranged at intervals can divide the track beam 121 into a plurality of small segments with smaller span, so that the torsional rigidity of the track beam 121 can be further improved.
The first cross member 122 is also manufactured in a factory, and in order to minimize the assembling work at the construction site, the first cross member 122 may be integrally connected to the rail member 121 in the factory and then directly connected to the upper chord 111 at the construction site.
In some embodiments, first cross member 122 may not be provided, track beam 121 may be directly connected to upper chord 111, and track beam 121 may also be connected to upper chord 111 through other intermediate connectors, as long as track beam assembly 120 is connected to upper chord 111.
In an embodiment, referring to fig. 1, fig. 2 and fig. 4, the number of the track beams 121 is two, and the two track beams 121 are respectively disposed on two sides of the upper chord 111. That is, both sides of the main girder 110 are accessible for the suspended monorail to pass through.
In some embodiments, the track beam 121 may be disposed on only one side of the top chord 111.
In one embodiment, referring to fig. 1, 2 and 4, the track beam assembly 120 further includes two second cross beams 123; each of two opposite ends of the upper chord 111 along the extending direction is connected to one second cross beam 123, and each second cross beam 123 is connected to the track beam 121.
Specifically, when the number of the track beams 121 on the suspended monorail pier-beam consolidated beam bridge is one, one end of two opposite ends of each second cross beam 123 in the transverse direction may be connected to the upper chord 111, and the other end of each second cross beam may be connected to the track beam 121; when the number of the track beams 121 on the suspended monorail pier beam consolidation type beam bridge is two, each end of two opposite ends of each second cross beam 123 along the transverse direction can be respectively connected with one track beam 121, and each end of two opposite ends of the upper chord 111 along the extension direction can be connected with the side wall of the corresponding second cross beam 123. That is, the upper chord 111, the track beam 121, and the two second cross members 123 may be assembled to form a frame structure, and thus, the stability of the connection between the track beam assembly 120 and the upper chord 111 may be further improved.
In an embodiment, referring to fig. 1, fig. 2 and fig. 4, each second cross beam 123 is rigidly connected to the top end surface of the corresponding pier 200, that is, the height of the lower chord 112 is lower than the height of the top end surface of the pier 200, so that the overall height of the suspended monorail pier-beam consolidated beam bridge can be effectively reduced, and thus, the space occupied by the suspended monorail pier-beam consolidated beam bridge can be reduced, and the overall stability of the suspended monorail pier-beam consolidated beam bridge can be further improved.
In an embodiment, referring to fig. 1 and 3, the main truss 110 further includes at least two support bars 114, at least one support bar 114 is disposed at each of two opposite ends of the lower chord 112 along the extending direction, a top end of each support bar 114 is rigidly connected to the lower chord 112, and a bottom end of each support bar 114 is rigidly connected to the corresponding pier 200. That is, only one support rod 114 may be disposed at each of the opposite ends of the lower chord 112 in the extending direction, or a plurality of support rods 114 may be disposed, and the support rods 114 may improve the stability of the connection between the main truss 110 and the pier 200, thereby further improving the overall stability of the suspended monorail pier-girder consolidated girder bridge.
In an embodiment, referring to fig. 1 and 3, each of two opposite ends of the lower chord 112 along the extending direction is provided with a support rod 114, the top end of the web member 113 closest to the pier 200 is rigidly connected to the corresponding pier 200, and the bottom end of the web member 113 closest to the pier 200 is connected to the top end of the corresponding support rod 114. That is, a triangular support structure is formed between the web member 113 closest to the pier 200 and the corresponding support bar 114 and the corresponding pier 200, whereby the stability of the connection between the main truss 110 and the pier 200 can be further improved.
In one embodiment, referring to fig. 4, the track beam 121 includes a box 1211, a web 1212 and a plurality of diaphragms 1213 disposed in the box 1211; the web 1212 is connected to the bottom wall of the casing 1211 and the top wall of the casing 1211 to divide the casing 1211 into two chambers, which are referred to as a first chamber 1211a and a second chamber 1211b for convenience of description, and the first chamber 1211a is located on a side of the second chamber 1211b close to the main truss 110; a plurality of cross partitions 1213 are arranged in the first chamber 1211a at intervals along the extending direction of the suspended monorail pier-beam consolidated beam bridge, and each cross partition 1213 is connected with the inner wall of the first chamber 1211 a; an opening 1211c is formed in the bottom wall of the second chamber 1211b, the opening 1211c extends along the extending direction of the suspended monorail pier-beam fixed beam bridge, and the inner surfaces of the bottom wall of the second chamber 1211b, which are located on two sides of the opening 1211c, form a running surface 1211 d. That is, the track beam 121 has a single-box double-chamber structure, the bogie of the suspended monorail is disposed in the second chamber 1211b and connected to the body of the suspended monorail through the opening 1211c, and the wheels of the bogie can directly roll on the running surface 1211d in the second chamber 1211b or can roll on the running rails laid on the running surface 1211 d. The plurality of diaphragms 1213 in the first chamber 1211a may provide reinforcement to the rail beam 121 to further increase torsional stiffness of the rail beam 121.
In one embodiment, referring to fig. 4, the track beam 121 further includes a plurality of first stiffening plates 1214, and the plurality of first stiffening plates 1214 are disposed on a side of the box 1211 facing away from the main truss 110 and spaced apart from each other along the extending direction of the suspended monorail pier-beam consolidated beam bridge. The plurality of first reinforcing plates 1214 may also reinforce the rail beam 121, and thus, the torsional rigidity of the rail beam 121 may be further improved.
In one embodiment, referring to fig. 4, the track beam 121 further includes a plurality of second reinforcing plates 1215, the plurality of second reinforcing plates 1215 are disposed on an outer surface of a top wall of the box 1211 and are spaced apart from each other along an extending direction of the suspended monorail pier beam consolidated bridge, and the plurality of second reinforcing plates 1215 also reinforce the track beam 121, thereby further improving torsional rigidity of the track beam 121.
In one embodiment, referring to fig. 4, the track beam 121 further includes a plurality of third stiffening plates 1216, the plurality of third stiffening plates 1216 are disposed on the outer surface of the bottom wall of the box 1211 and are spaced apart from each other along the extending direction of the suspended monorail pier beam consolidated bridge, and the plurality of third stiffening plates 1216 can also reinforce the track beam 121, thereby further improving the torsional rigidity of the track beam 121.
The various embodiments/implementations provided herein may be combined with each other without contradiction.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application are included in the protection scope of the present application.
Claims (10)
1. A single track mound beam consolidation formula girder bridge of suspension type which characterized in that includes:
the truss structure comprises a plurality of truss structures, each truss structure comprises a main truss and a track beam assembly, the main truss comprises an upper chord, a lower chord and a plurality of web members, the track beam assembly comprises a track beam, the web members are connected with the upper chord and the lower chord, the track beam assembly is connected with the upper chord, and the track beam is positioned on the side edge of the upper chord;
the bridge comprises a plurality of bridge piers, wherein one truss structure is arranged between every two adjacent bridge piers, and the main truss of each truss structure is respectively and rigidly connected with the corresponding bridge pier.
2. The suspended monorail pier-beam consolidated bridge according to claim 1, wherein the rail beam assembly further comprises a plurality of first cross beams, the plurality of first cross beams are arranged at intervals along the extending direction of the suspended monorail pier-beam consolidated bridge, one end of each first cross beam is connected with the upper chord, and the other end of each first cross beam is connected with the rail beam.
3. The suspended monorail pier-beam consolidated beam bridge according to claim 1 or 2, wherein the number of the rail beams is two, and the two rail beams are respectively disposed on two sides of the upper chord.
4. The suspended monorail pier-beam consolidated beam bridge of claim 1 or 2, wherein the track beam assembly further comprises two second cross beams;
each end of the two opposite ends of the upper chord along the extending direction is respectively connected with one second cross beam, and each second cross beam is respectively connected with the track beam.
5. The suspended monorail pier beam consolidated girder bridge according to claim 4, wherein each of the second cross beams is rigidly connected to a top end surface of the corresponding pier.
6. A suspended monorail pier beam consolidated beam bridge according to claim 1 or 2,
the main truss still includes two piece at least bracing pieces, each end at the relative both ends of lower chord member along extending direction is provided with one at least the bracing piece, every the top of bracing piece with lower chord member rigid connection, every the bottom of bracing piece with correspond pier rigid connection.
7. The suspended monorail pier beam consolidated girder bridge according to claim 6, wherein one support rod is provided at each of opposite ends of the lower chord in the extending direction, the top end of the web member closest to the pier is rigidly connected to the corresponding pier, and the bottom end of the web member closest to the pier is connected to the top end of the corresponding support rod.
8. A suspended monorail pier-beam consolidated beam bridge according to claim 1 or 2, wherein the main truss is assembled from a plurality of truss segments, each truss segment having a length of 15-30 m; and/or the presence of a gas in the gas,
the track beam is formed by splicing a plurality of track beam sections, and the length of each track beam section is 15-30 m.
9. The suspended monorail pier beam consolidated beam bridge of claim 8, wherein the rail beam comprises a box, and a web and a plurality of diaphragms disposed in the box;
the web is connected with the bottom wall of the box body and the top wall of the box body so as to divide the box body into two chambers, the two chambers are respectively a first chamber and a second chamber, and the first chamber is positioned on one side of the second chamber close to the main truss;
the diaphragm plates are arranged in the first chamber and are arranged at intervals along the extending direction of the suspended monorail pier-beam consolidated beam bridge, and each diaphragm plate is connected with the inner wall of the first chamber;
an opening is formed in the bottom wall of the second chamber, the opening extends along the extending direction of the suspended monorail pier beam consolidation type beam bridge, and the bottom wall of the second chamber is located on the inner surfaces of two sides of the opening to form a walking surface.
10. The suspended monorail pier-beam consolidated beam bridge of claim 9, wherein the track beam further comprises a plurality of first stiffening plates disposed on a side of the box body facing away from the main truss and spaced apart along an extension direction of the suspended monorail pier-beam consolidated beam bridge; and/or the presence of a gas in the gas,
the track beam also comprises a plurality of second reinforcing plates, and the second reinforcing plates are arranged on the outer surface of the top wall of the box body and are arranged at intervals along the extending direction of the suspended monorail pier beam consolidation type beam bridge; and/or the presence of a gas in the gas,
the track roof beam still includes a plurality of third reinforcing plates, and is a plurality of the third reinforcing plate sets up the surface of the diapire of box just follows the extending direction interval of suspension type monorail pier beam concretion formula girder bridge sets up.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399916.0A CN112376392A (en) | 2020-12-02 | 2020-12-02 | Suspension type monorail pier beam consolidation type beam bridge |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011399916.0A CN112376392A (en) | 2020-12-02 | 2020-12-02 | Suspension type monorail pier beam consolidation type beam bridge |
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| CN112376392A true CN112376392A (en) | 2021-02-19 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115787374A (en) * | 2022-12-28 | 2023-03-14 | 中铁重工有限公司 | Steel structure truss girder bridge with aerial track and manufacturing method thereof |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115787374A (en) * | 2022-12-28 | 2023-03-14 | 中铁重工有限公司 | Steel structure truss girder bridge with aerial track and manufacturing method thereof |
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