CN110029537A - A kind of magnetic levitation track traffic duplex word support rail beam and its construction method - Google Patents
A kind of magnetic levitation track traffic duplex word support rail beam and its construction method Download PDFInfo
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- CN110029537A CN110029537A CN201910209521.0A CN201910209521A CN110029537A CN 110029537 A CN110029537 A CN 110029537A CN 201910209521 A CN201910209521 A CN 201910209521A CN 110029537 A CN110029537 A CN 110029537A
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- riser
- top plate
- support rail
- bottom plate
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- 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
- E01B25/30—Tracks for magnetic suspension or levitation vehicles
- E01B25/305—Rails or supporting constructions
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
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Abstract
The invention discloses a kind of magnetic levitation track traffic duplex word support rail beams, including along the symmetrically arranged I-beam of line direction, the I-beam includes bottom plate (1), the riser (2) being vertical on the bottom plate (1) and the top plate (3) perpendicular to the riser (2) setting, the top plate (3) and riser (2) reserve connecting elements respectively, the width of the riser (2) is less than the width of the bottom plate (1) and top plate (2), and the bottom plate (1), riser (2) and top plate (3) collectively form structural I-beam.The invention also discloses the construction methods of the support rail beam.Duplexing word support rail beam of the invention, track structure and train load pass to riser by top plate, then are transmitted to bottom plate by riser, then pass to support construction by bottom plate.Meet the ride comfort requirement of track structure using the rigidity of I-beam and support construction below, it is ensured that magnetic-levitation train safe operation, and material utilization amount is saved, and reduce the influence of temperature load.
Description
Technical field
The invention belongs to magnetic levitation track technical field of transportation, hold more particularly, to a kind of magnetic levitation track traffic duplex word
Beam-and-rail and its construction method.
Background technique
Middle low speed magnetic suspension rail traffic belongs to a kind of novel rail traffic mode, since its climbing capacity is strong, turning
Radius is small, project cost is low, environmental pollution is small, therefore, increasingly by the demand of urban development.Its route is divided into overhead knot
Structure, underground structure and it is low set structure, wherein underground structure, low set structure and the beam upper beam mode of elevated structure is respectively provided with support rail
Beam carrys out supporting track structure, and support rail beam is an important component in magnetic levitation track traffic engineering.Support rail beam in engineering practice
Diversity is presented in structure type, and the support rail beam form used has box beam, solid beam, frame column beam etc..
Existing support rail beam technology has the disadvantage that
(1) box beam is a kind of relatively conventional beam type, and advantage is saving material, rigidity is big, deformation is small, but due to support rail beam
Structure size is smaller, the installation of case inner template and removes very inconvenient when construction, while personnel not can enter in box, in spar-box
It is very big to overhaul difficulty.
(2) the advantages of frame column beam is portable construction, saves material, but since column, longitudinal and transverse binder are all small members, often
A component need to individually establish template and pour, and the process of construction is very cumbersome.
(3) be that structure type is simple the advantages of solid beam, construct it is convenient, but solid beam have from it is great, to foundation bearing
Force request is high, waste masonry material, the disadvantages of being influenced by temperature load.
(4) existing support rail beam technology is all made of cast-in-place construction, and the construction period is longer, and construction quality should not control.
Summary of the invention
Aiming at the above defects or improvement requirements of the prior art, the present invention provides a kind of magnetic levitation track traffic duplex word support rail
Beam and its construction method, it is intended that I-beam pre-fabricated factory it is prefabricated process and quality inspection it is qualified after be transported to construction site,
Every two I-beam is symmetrically mounted in the support constructions such as tunnel, roadbed or bridge in wire center, the bottom plate of two I-beams
Between reserve connection reinforcing bar and post-cast strip, two I-beams are poured by after-pouring concrete integral, become a section support rail
Beam, reduces the weight and difficulty of construction of lifting components, while it is short to assemble the construction period, is easy to overhaul and safeguard.
To achieve the goals above, according to one aspect of the present invention, a kind of magnetic levitation track traffic duplex word support rail is provided
Beam, in the support construction of roadbed, tunnel or bridge etc, comprising:
Along the symmetrically arranged I-beam of line direction, which includes bottom plate, the riser that is vertical on the bottom plate
And the top plate perpendicular to riser setting, the top plate reserve connecting elements, are used for attachment rail structure, the riser is pre-
Connection member is lingered on, for installing power supply unit；
The width of the riser is less than the width of the bottom plate and top plate, and the bottom plate, riser and top plate collectively form
Structural I-beam, for the load of track structure and train to be transmitted to by the structural I-beam while being guaranteed the certainly steady of structure
Property.
Further, the bottom plate, riser and top plate are reinforced concrete member.
Further, the I-beam is prefabricated components, is equipped with connection reinforcing bar and post-cast strip, the connection between twin I-beam
The bottom plate that reinforcing bar and post-cast strip are set to each I-beam is connected and composed close to symmetrical center line side for realizing two precast H-beams
The duplexing font support rail girder construction of globality.
Further, the riser, top plate are rectangular section, and the bottom plate is rectangular section or up-narrow and down-wide trapezoidal
Section.
Further, the inner corner trim of the riser and top plate, riser and back plate connections is equipped with chamfering or rounding.
Further, the position that the bottom of the riser is docked with the bottom plate be equipped with riser bottom chamfer, top with it is described
The position of top plate docking is equipped with riser top chamfering.
Further, the position that the bottom of the riser is docked with the bottom plate be equipped with riser bottom rounding, top with it is described
The position of top plate docking is equipped with riser top rounding.
Other side according to the invention, I-beam are prefabricated components, and it is double to provide magnetic levitation track traffic described in one kind
The construction method of I-shaped support rail beam, includes the following steps:
S1: prefabricated processing I-beam, including bottom plate, riser and top plate, formed by integrally casting molding, pre-buried good top plate before pouring
It with the connecting elements of riser, while reserving and connecting reinforcing bar, precast H-beam, connecting elements and connection reinforcing bar are transported after the assay was approved
To construction site；
S2: the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes, then in wire center pair
Claim installation two I-beams, and reserved post-cast strip and connection reinforcement location；
The connection reinforcing bar that S3: welding or/and binding I-beam bottom is reserved, pours post-cast strip concrete, prefabricated by two
I-beam pours integrally；
S4: after casting concrete reaches design requirement, the attachment rail structure on top plate, installation power supply is set on riser
It is standby.
Further, I-beam is site concrete, is included the following steps:
S10: the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes, then in wire center pair
Claim binding I-shaped beam steel, installation template；
S11: pouring duplexing word support rail beam concrete, the connecting elements of pre-buried good top plate and riser before pouring；
S12: after casting concrete reaches design requirement, the attachment rail structure on top plate installs power supply on riser
Equipment.
In general, through the invention it is contemplated above technical scheme is compared with the prior art, can obtain down and show
Beneficial effect:
1. duplexing word support rail beam of the invention, track structure and train load pass to riser by top plate, then by riser
It is transmitted to bottom plate, then support construction is passed to by bottom plate.Meet track knot using the rigidity of I-beam and support construction below
The ride comfort requirement of structure, it is ensured that magnetic-levitation train safe operation, and material utilization amount is saved, and reduce the influence of temperature load.
2. duplexing word support rail beam of the invention can be used two prefabricated I-beams and be assembled into a section support rail beam, reduces
Prefab-form cost, reduces the weight and difficulty of construction of lifting components, while it is short to assemble the construction period, is easy to overhaul and tie up
Shield.
3. duplexing word support rail beam of the invention, I-beam and track structure form globality steel and concrete structure, shared magnetic
Floating vehicular load, has preferably played the stiffness of steel type sleeper.
4. duplexing word support rail beam of the invention, when being directly placed on roadbed, for the ease of I-beam location and installation, beam bottom
Settable rubble or concrete cushion play leveling and positioning action as operation platform.
5. duplexing word support rail beam of the invention is effectively increased by the riser bottom chamfer and riser top chamfering being oppositely arranged
The sectional area of structure intermediate location, and the chamfered transition of structural attachments is realized, the ride comfort of load transmission is increased, greatly
The stress concentration at this is slowed down greatly.
6. duplexing word support rail beam of the invention is effectively increased by the riser bottom rounding and riser top rounding being oppositely arranged
The sectional area of structure intermediate location, and the rounding off of structural attachments is realized, the ride comfort of load transmission is increased, into
One step slows down the stress concentration at this.
7. method of the invention, when I-beam is prefabricated components, pre-fabricated factory it is prefabricated process and quality inspection it is qualified after transport
To construction site, every two I-beam is symmetrically mounted in the support constructions such as tunnel, roadbed or bridge in wire center, two works
Connection reinforcing bar and post-cast strip 4 is reserved between the bottom plate 1 of word beam, two I-beams are poured by after-pouring concrete it is integral,
As a section support rail beam, the weight and difficulty of construction of lifting components are reduced, while it is short to assemble the construction period, is easy to overhaul and tie up
Shield.
Detailed description of the invention
Fig. 1 is a kind of 1 schematic cross-section of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention；
Fig. 2 is a kind of 1 scheme of installation of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention；
Fig. 3 is a kind of 2 schematic cross-section of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention；
Fig. 4 is a kind of 2 scheme of installation of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention；
Fig. 5 is a kind of 3 schematic cross-section of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention；
Fig. 6 is a kind of 3 scheme of installation of magnetic levitation track traffic duplex word support rail beam embodiment of the present invention.
In all the appended drawings, same appended drawing reference indicates identical technical characteristic, specifically: 1- bottom plate, 2- riser, 3-
Top plate, the post-cast strip 4-, 5- track, 6- steel type sleeper, 7-F type guide rail, 8- power rail, 9- connecting elements, 201- riser bottom are fallen
Angle, 202- riser top chamfering, 203- riser bottom rounding, 204- riser top rounding.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, with reference to the accompanying drawings and embodiments, right
The present invention is further elaborated.It should be appreciated that described herein, specific examples are only used to explain the present invention, not
For limiting the present invention.As long as in addition, technical characteristic involved in the various embodiments of the present invention described below that
Not constituting conflict between this can be combined with each other.
It as depicted in figs. 1 and 2, is magnetic levitation track traffic duplex word support rail girder construction schematic diagram in the embodiment of the present invention 1.It should
Magnetic levitation track traffic duplex word support rail beam includes two symmetrically arranged I-beams and the post-cast strip 4 between the I-beam.
Wherein, two I-beams can be precast H-beam, realize cast-in-place be fixedly connected by the post-cast strip 4 after symmetrical assembly.
As shown in Figure 1, I-beam includes bottom plate 1, riser 2 and top plate 3, three is reinforced concrete member, disposably
It pours.Bottom plate 1 is rectangular section, and riser 2 is rectangular section, arranges and is fixed on bottom plate 1 perpendicular to bottom plate 1, is pushed up
Plate 3 is rectangular section, is arranged perpendicular to riser 2, and be fixed in the top of riser 2.
Further, the outside of riser 2 is equipped with connecting elements 9, which is fixedly connected with riser 2, and with power supply
Rail 8 matches, for powering for magnetic suspension train.
As shown in Fig. 2, I-beam pre-fabricated factory it is prefabricated process and quality inspection it is qualified after be transported to construction site, every two work
Word beam is symmetrically mounted in the support constructions such as tunnel, roadbed or bridge in wire center, is reserved between the bottom plate 1 of two I-beams
Reinforcing bar and post-cast strip 4 are connected, is poured two I-beams by after-pouring concrete integral, becomes a section support rail beam.Such as Fig. 1
Shown, track 5 is set on top plate 3, and for installing steel type sleeper 6, steel type sleeper 6 connects by the way that connector and F type guide rail 7 are fixed
It connects, to constitute magnetic-levitation traffic duplex word support rail girder construction.
Track structure and train load pass to riser 2 by top plate 3 when work, then are transmitted to bottom plate 1 by riser 2, then by
Bottom plate 1 passes to support construction.It is wanted using the rigidity of I-beam and support construction below to meet the ride comfort of track structure
It asks, it is ensured that magnetic-levitation train safe operation.
Above-mentioned construction is assembled into support rail beam using two symmetrical precast H-beams, can effectively save material utilization amount,
The influence of temperature load is reduced, prefab-form cost is reduced, reduces the weight and difficulty of construction of lifting components, while assembling construction
Short time limit is easy to maintenance and safeguards, I-beam and track structure composition globality steel and concrete structure, shared vehicular load, more
The good stiffness for having played steel type sleeper.
As shown in Figure 3 and Figure 4 in another embodiment of the present invention, magnetic levitation track traffic duplex word support rail girder construction is illustrated
Figure.The magnetic levitation track traffic duplex word support rail beam include two symmetrically arranged I-beams and between the I-beam after pour
Band 4.Wherein, two I-beams can be precast H-beam, realize cast-in-place be fixedly connected by the post-cast strip 4 after symmetrical assembly.
As shown in figure 3, I-beam includes bottom plate 1, riser 2 and top plate 3, three is reinforced concrete member, disposably
It pours.Bottom plate 1 is rectangular section, and riser 2 is rectangular section, arranges and is fixed on bottom plate 1 perpendicular to bottom plate 1, is pushed up
Plate 3 is rectangular section, is arranged perpendicular to riser 2, and be fixed in the top of riser 2.Preferably, 2 bottom of riser and bottom plate 1 are right
The position connect is equipped with riser bottom chamfer 201, and the position that top is docked with top plate 3 is equipped with riser top chamfering 202, is set by opposite
The riser bottom chamfer 201 and riser top chamfering 202 set, effectively increase the sectional area at structural transition position, and realize structure
The chamfered transition of junction increases the ride comfort of load transmission, slows down the stress concentration at this significantly.
As shown in Figure 5 and Figure 6 in another embodiment of the present invention, magnetic levitation track traffic duplex word support rail girder construction is illustrated
Figure.The magnetic levitation track traffic duplex word support rail beam include two symmetrically arranged I-beams and between the I-beam after pour
Band 4.Wherein, two I-beams can be precast H-beam, realize cast-in-place be fixedly connected by the post-cast strip 4 after symmetrical assembly.
As shown in figure 3, I-beam includes bottom plate 1, riser 2 and top plate 3, three is reinforced concrete member, disposably
It pours.Bottom plate 1 is rectangular section, and riser 2 is rectangular section, arranges and is fixed on bottom plate 1 perpendicular to bottom plate 1, is pushed up
Plate 3 is rectangular section, is arranged perpendicular to riser 2, and be fixed in the top of riser 2.Preferably, 2 bottom of riser and bottom plate 1 are right
The position connect is equipped with riser bottom rounding 203, and the position that top is docked with top plate 3 is equipped with riser top rounding 204, is set by opposite
The riser bottom rounding 203 and riser top rounding 204 set, effectively increase the sectional area at structural transition position, and realize structure
The rounding off of junction increases the ride comfort of load transmission, further slows down the stress concentration at this.
In addition, I-beam is prefabricated components in another embodiment of the invention, the friendship of magnetic levitation track described in one kind is provided
The construction method of logical duplex word support rail beam, includes the following steps:
S1: prefabricated processing I-beam, including bottom plate, riser and top plate, formed by integrally casting molding, pre-buried good top plate before pouring
It with the connecting elements of riser, while reserving and connecting reinforcing bar, precast H-beam, connecting elements and connection reinforcing bar are transported after the assay was approved
To construction site；
S2: the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes, then in wire center pair
Claim installation two I-beams, and reserved post-cast strip and connection reinforcement location；
The connection reinforcing bar that S3: welding or/and binding I-beam bottom is reserved, pours post-cast strip concrete, prefabricated by two
I-beam pours integrally；
S4: after casting concrete reaches design requirement, the attachment rail structure on top plate, installation power supply is set on riser
It is standby.
I-beam is site concrete, is included the following steps:
S10: the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes, then in wire center pair
Claim binding I-shaped beam steel, installation template；
S11: pouring duplexing word support rail beam concrete, the connecting elements of pre-buried good top plate and riser before pouring；
S12: after casting concrete reaches design requirement, the attachment rail structure on top plate installs power supply on riser
Equipment.
Method of the invention, I-beam pre-fabricated factory it is prefabricated process and quality inspection it is qualified after be transported to construction site, every two
A I-beam is symmetrically mounted in the support constructions such as tunnel, roadbed or bridge in wire center, between the bottom plate 1 of two I-beams
Reserved connection reinforcing bar and post-cast strip 4, are poured two I-beams by after-pouring concrete integral, become a section support rail beam,
The weight and difficulty of construction of lifting components are reduced, while it is short to assemble the construction period, is easy to overhaul and safeguard.
As it will be easily appreciated by one skilled in the art that the foregoing is merely illustrative of the preferred embodiments of the present invention, it is not used to
The limitation present invention, any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should all include
Within protection scope of the present invention.
Claims (9)
1. a kind of magnetic levitation track traffic duplex word support rail beam, in the support construction of roadbed, tunnel or bridge etc, feature
It is, comprising:
Along the symmetrically arranged I-beam of line direction, which includes bottom plate (1), is vertical at erecting on the bottom plate (1)
Plate (2) and the top plate (3) being arranged perpendicular to the riser (2), the top plate (3) reserve connecting elements, are used for attachment rail
Structure, the riser (2) reserves connecting elements, for installing power supply unit；
The width of the riser (2) is less than the width of the bottom plate (1) and top plate (2), and the bottom plate (1), riser (2) and top
Plate (3) collectively forms structural I-beam, for transmitting while protecting the load of track structure and train by the structural I-beam
Demonstrate,prove the self-stability of structure.
2. a kind of magnetic levitation track traffic duplex word support rail beam according to claim 1, which is characterized in that the bottom plate (1),
Riser (2) and top plate (3) are reinforced concrete member.
3. a kind of magnetic levitation track traffic duplex word support rail beam according to claim 1 or 2, which is characterized in that the I-shaped
Beam is prefabricated components, and connection reinforcing bar and post-cast strip (4) are equipped between twin I-beam, and the connection reinforcing bar and post-cast strip (4) are set to each
The bottom plate (1) of I-beam connects and composes the duplexing word of globality for realizing two precast H-beams close to symmetrical center line side
Type support rail girder construction.
4. a kind of magnetic levitation track traffic duplex word support rail beam according to any one of claim 1-3, which is characterized in that institute
Riser (2), the top plate (3) stated are rectangular section, and the bottom plate (1) is rectangular section or up-narrow and down-wide trapezoid cross section.
5. a kind of magnetic levitation track traffic duplex word support rail beam described in any one of -4 according to claim 1, which is characterized in that institute
The inner corner trim for stating riser (2) and top plate (3), riser (2) and bottom plate (1) junction is equipped with chamfering or rounding.
6. a kind of magnetic levitation track traffic duplex word support rail beam according to any one of claims 1-5, which is characterized in that institute
It states the position that riser (2) bottom is docked with the bottom plate (1) and is equipped with riser bottom chamfer (201), top is right with the top plate (3)
The position connect is equipped with riser top chamfering (202).
7. a kind of magnetic levitation track traffic duplex word support rail beam according to claim 1 to 6, which is characterized in that institute
It states the position that riser (2) bottom is docked with the bottom plate (1) and is equipped with riser bottom rounding (203), top is right with the top plate (3)
The position connect is equipped with riser top rounding (204).
8. a kind of construction method of such as magnetic levitation track traffic duplex word support rail beam of any of claims 1-7, I-shaped
Beam is prefabricated components, which comprises the steps of:
S1: prefabricated processing I-beam, including bottom plate (1), riser (2) and top plate (3), formed by integrally casting molding are pre-buried before pouring
The connecting elements of good top plate and riser, while reserving and connecting reinforcing bar, precast H-beam, connecting elements and connection reinforcing bar are examined and are closed
Construction site is transported to after lattice；
S2: then the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes symmetrically is pacified in wire center
Fill two I-beams, and reserved post-cast strip (4) and connection reinforcement location；
The connection reinforcing bar that S3: welding or/and binding I-beam bottom is reserved, pours post-cast strip (4) concrete, by two prefabricated works
Word beam pours integrally；
S4: after casting concrete reaches design requirement, the attachment rail structure on top plate (3), installation power supply is set on riser
It is standby.
9. the construction method of magnetic levitation track traffic duplex word support rail beam, I-beam are site concrete according to claim 8,
It is characterized in that, includes the following steps:
S10: then the first construction cushion coat in the support constructions such as tunnel, roadbed, the bridge that construction finishes symmetrically is tied up in wire center
Mutual aid system devised for poor peasants word beam steel, installation template；
S11: pouring duplexing word support rail beam concrete, the connecting elements of pre-buried good top plate and riser before pouring；
S12: after casting concrete reaches design requirement, the attachment rail structure on top plate (3), installation power supply is set on riser
It is standby.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209521.0A CN110029537A (en) | 2019-03-19 | 2019-03-19 | A kind of magnetic levitation track traffic duplex word support rail beam and its construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910209521.0A CN110029537A (en) | 2019-03-19 | 2019-03-19 | A kind of magnetic levitation track traffic duplex word support rail beam and its construction method |
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| CN110029537A true CN110029537A (en) | 2019-07-19 |
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| CN201910209521.0A Pending CN110029537A (en) | 2019-03-19 | 2019-03-19 | A kind of magnetic levitation track traffic duplex word support rail beam and its construction method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19625305A1 (en) * | 1996-06-25 | 1998-01-02 | Dyckerhoff & Widmann Ag | Magnetic suspension track support stands |
| CN104480810A (en) * | 2014-12-11 | 2015-04-01 | 中铁第四勘察设计院集团有限公司 | Medium-and-low speed magnetic levitation railway low route continuous framework type bearing rail beam structure and construction method |
| CN207793771U (en) * | 2017-12-26 | 2018-08-31 | 中铁第四勘察设计院集团有限公司 | Middle low speed magnetic suspension traffic engineering is low to set circuit support rail beam |
| CN208577894U (en) * | 2018-11-12 | 2019-03-05 | 中铁磁浮交通投资建设有限公司 | A kind of I-shaped support rail beam of medium-and low-speed maglev rail traffic |
| CN209975273U (en) * | 2019-03-19 | 2020-01-21 | 中铁磁浮交通投资建设有限公司 | double-I-shaped rail bearing beam for magnetic suspension rail transit |
-
2019
- 2019-03-19 CN CN201910209521.0A patent/CN110029537A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19625305A1 (en) * | 1996-06-25 | 1998-01-02 | Dyckerhoff & Widmann Ag | Magnetic suspension track support stands |
| CN104480810A (en) * | 2014-12-11 | 2015-04-01 | 中铁第四勘察设计院集团有限公司 | Medium-and-low speed magnetic levitation railway low route continuous framework type bearing rail beam structure and construction method |
| CN207793771U (en) * | 2017-12-26 | 2018-08-31 | 中铁第四勘察设计院集团有限公司 | Middle low speed magnetic suspension traffic engineering is low to set circuit support rail beam |
| CN208577894U (en) * | 2018-11-12 | 2019-03-05 | 中铁磁浮交通投资建设有限公司 | A kind of I-shaped support rail beam of medium-and low-speed maglev rail traffic |
| CN209975273U (en) * | 2019-03-19 | 2020-01-21 | 中铁磁浮交通投资建设有限公司 | double-I-shaped rail bearing beam for magnetic suspension rail transit |
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