CN110685191A - Track structure, track system and track construction method - Google Patents
Track structure, track system and track construction method Download PDFInfo
- Publication number
- CN110685191A CN110685191A CN201910805175.2A CN201910805175A CN110685191A CN 110685191 A CN110685191 A CN 110685191A CN 201910805175 A CN201910805175 A CN 201910805175A CN 110685191 A CN110685191 A CN 110685191A
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- China
- Prior art keywords
- track
- groove body
- plate
- track structure
- steel rail
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Classifications
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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
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B19/00—Protection of permanent way against development of dust or against the effect of wind, sun, frost, or corrosion; Means to reduce development of noise
- E01B19/003—Means for reducing the development or propagation of noise
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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
- E01B2/00—General structure of permanent way
- E01B2/003—Arrangement of tracks on bridges or in tunnels
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Machines For Laying And Maintaining Railways (AREA)
Abstract
The application discloses a track structure, a track system and a track construction method, and relates to the technical field of track traffic. The rail structure comprises a groove body and a steel rail, the steel rail is arranged in the groove body and connected with the groove body, and the groove body is provided with a mounting hole used for being connected with a rail plate. The track structure can be prefabricated in advance according to the actual construction condition, because track structure's disconnect-type and can the pin-connected panel characteristic, directly lay prefabricated track structure on the track board and form the track when the construction to improve track construction's efficiency.
Description
Technical Field
The application relates to the technical field of rail transit, in particular to a rail structure, a rail system and a rail construction method.
Background
The groove structure that embedded track structure of subway used generally adopts the concrete recess, directly designs a groove structure promptly and is used for placing rail and fastener system on integral track board.
The existing concrete groove enables the construction space to be limited, and steel rail laying needs on-site construction, so that the construction efficiency is greatly reduced.
Disclosure of Invention
The application provides a track structure, a track system and a track construction method, the track structure can be prefabricated in advance according to actual construction conditions, and due to the separated and assembled characteristics of the track structure, the prefabricated track structure is directly laid on a track plate to form a track during construction, so that the efficiency of track construction is improved.
In a first aspect, a track structure is provided, the track structure comprising a trough and a rail; the steel rail is arranged in the groove body and connected with the groove body, and the groove body is provided with a mounting hole used for being connected with the rail plate.
According to the technical scheme, the rail structure directly connects the steel rail with the groove body, can be prefabricated in advance according to actual use working conditions, and is directly installed on the rail plate through the installation hole to form the rail when being laid, so that the construction efficiency of the rail is improved; in addition, the disconnect-type of track structure and the characteristic of pin-connected panel are favorable to the overall position adjustment of track structure on the track board to keep orbital geometry position, and traditional concrete recess carries out position adjustment through the fastener system, need destroy the filler material in the concrete recess and just can realize, can lead to the inconvenience and the waste of low and later stage operation maintenance of efficiency of construction.
With reference to the first aspect, in a first possible implementation manner of the first aspect of the present application, the tank body includes a first vertical plate, a second vertical plate, and a bottom plate; the first vertical plate and the second vertical plate are oppositely arranged and are connected to the bottom plate; the steel rail is connected to the bottom plate and arranged between the first vertical plate and the second vertical plate, and the mounting hole is formed in the bottom plate.
Above-mentioned technical scheme, the cell body includes first riser, second riser and bottom plate, and the rail connection is in the bottom plate to set up the mounting hole on the bottom plate, be convenient for like this process the prefabrication in the mill, improve machining efficiency.
With reference to the first possible implementation manner of the first aspect, in a second possible implementation manner of the first aspect of the present application, one filling groove is formed between the steel rail and the first riser, and another filling groove is formed between the steel rail and the second riser; and pouring and filling high polymer materials into the two filling grooves to form the damping block.
Above-mentioned technical scheme, because the rail respectively with first riser and second riser between form two filling grooves, when prefabricated, directly pack the macromolecular material in the filling groove and form the damping piece, this need cast-in-place at the construction site at last for traditional concrete groove, the efficiency of construction is promoted by a wide margin.
With reference to the second possible implementation manner of the first aspect, in a third possible implementation manner of the first aspect of the present application, the damping block is provided with a plurality of holes, and damping particles are disposed in the holes.
Compared with the defects of single energy consumption form and short service life caused by single traditional damping material, the damping particles are arranged in the holes in the damping block, and in the vibration transmission process, the vibration energy transmitted to the damping block is dissipated through the collision among the damping particles and the damping block, so that the vibration energy transmitted to the track structure and the lower foundation (such as structures such as a track plate and the like) of the track structure is less, the aging speed of the damping block is reduced, and the integral service life of the track structure is prolonged; in addition, compare in the aspect of the performance of making an uproar that falls from the damping, the medium kind of track structure is compared in concrete groove structure more, after vibration transmitted damping piece and damping granule from the rail, continue to transmit to the cell body and propagate downwards again, and concrete groove vibration passes through fastener system and propagates downwards on traditional sleeper, and transverse vibration just propagates to the track board through filling material only, because the elastic wave has certain decay in different kind of medium interface departments, therefore concrete groove design has better damping effect on track structure's multilayer vibration isolation design than traditional sleeper.
With reference to the first possible implementation manner of the first aspect, in a fourth possible implementation manner of the first aspect of the present application, the steel rail is connected to the bottom plate through a bolt; a first base plate is arranged between the steel rail and the bottom plate.
According to the technical scheme, the steel rail is connected with the bottom plate through the bolts, so that prefabrication and processing are facilitated; a first base plate is arranged between the steel rail and the bottom plate, so that the geometric shape and position between the steel rail and the bottom plate can be adjusted; on the other hand, the types of media of the track structure can be increased, vibration is transmitted to the first base plate in an elastic wave form after being transmitted to the damping blocks and the damping particles from the steel rail, and is continuously transmitted to the groove body and then is transmitted downwards, so that the track structure is provided with a multi-layer vibration isolation design in the vertical direction, the interface change impedance of materials is exerted, and a better vibration damping effect is achieved.
With reference to the first aspect, in a fifth possible implementation manner of the first aspect of the present application, the material of the tank body is steel.
Above-mentioned technical scheme, the cell body material adopts the steel, is convenient for purchase and prefabricated processing, compares traditional concrete groove, and the efficiency of construction is higher.
In a second aspect, a track system is provided, where the track system includes the track structure in the first aspect or any one of the possible implementation manners of the first aspect; the track system also comprises a track bed and a track slab; the track slab is installed on the track bed, and the cell body among the track structure is connected in the track slab through the fastener that wears to locate the mounting hole.
According to the technical scheme, the track system adopts a track structure, so that the track system can be prefabricated in advance; the installation of track structure is passed through the fastener and is connected, the construction of being convenient for.
With reference to the second aspect, in a first possible implementation manner of the second aspect of the present application, a second base plate is disposed between the track structure and the track plate.
According to the technical scheme, the second base plate is arranged between the track structure and the track plate and used for adjusting the geometric shape and position of the track structure on the construction and laying site; on the other hand, a vibration damping medium is added, and the vibration damping effect of the track system is further improved.
With reference to the second aspect, in a second possible implementation manner of the second aspect of the present application, the track system is a tunnel track system, and the track bed is disposed in a tunnel.
Above-mentioned technical scheme, in tunnel track system's construction, be subject to the spatial structure in tunnel, adopt prefabricated track structure to lay, for traditional tunnel cast in situ construction, the efficiency of construction can promote by a wide margin.
In a third aspect, a track construction method is provided, which includes the following steps: paving a ballast bed; fixing the track slab on a track bed; the track structure comprises a groove body and a steel rail, wherein the steel rail is arranged in the groove body and connected with the groove body, and the groove body is provided with a mounting hole for connecting with a track plate; the groove body is fixed on the track plate through a fastener penetrating through the mounting hole.
Above-mentioned technical scheme owing to adopt track structure, can effectively improve the efficiency of track construction.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
FIG. 1 is a schematic structural diagram of a track structure in an alternative embodiment of the present application;
FIG. 2 is a flow chart of a track construction method in an alternative embodiment of the present application.
Icon: 10-track structure; 110-steel rail; 122-a first riser; 124-a second riser; 126-a bottom plate; 1262-mounting holes; 130-a damping block; 132-holes; 140-damping particles; 150-first shim plate.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, generally described and illustrated in the figures herein, can be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present application, it is to be noted that the terms "inside", "below", and the like refer to orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that are conventionally arranged when products of the application are used, and are used only for convenience in describing the application and simplifying the description, but do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.
In the description of the present application, it is also to be noted that, unless otherwise explicitly specified or limited, the terms "disposed" and "connected" are to be interpreted broadly, e.g., as being either fixedly connected, detachably connected, or integrally connected; they may be mechanically coupled, directly coupled, indirectly coupled through intervening media, or may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood in a specific case by those of ordinary skill in the art.
In this application, unless expressly stated or limited otherwise, the first feature may be directly on or under the second feature or may include both the first and second features being in direct contact, but also the first and second features being in contact via another feature between them, not being in direct contact. Also, the first feature being above, on or above the second feature includes the first feature being directly above and obliquely above the second feature, or merely means that the first feature is at a higher level than the second feature. A first feature that underlies, and underlies a second feature includes a first feature that is directly under and obliquely under a second feature, or simply means that the first feature is at a lesser level than the second feature.
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.
An alternative embodiment of the present application provides a track structure 10, the track structure 10 being used for laying of an embedded track of a subway. It should be noted that the embodiments of the present application can also be used for track laying of a tunneled railway or a conventional route railway.
The track structure 10 can be prefabricated in advance according to the actual space condition of the tunnel in the design stage, and is directly installed on the track plate through the installation hole 1262 to form a track when being laid, so that the track structure is not limited by too much limited space of the tunnel, and the track construction efficiency can be improved. In addition, track structure 10's disconnect-type and the characteristic of pin-connected panel are favorable to track structure 10 overall position adjustment on the track board to keep orbital geometry position, and traditional concrete recess carries out position adjustment through the fastener system, need destroy the filler material in the concrete recess and just can realize, can lead to the inconvenience and the waste of the low and later stage operation maintenance of efficiency of construction.
Referring to fig. 1, fig. 1 shows a specific structure of a track structure 10 provided in an alternative embodiment of the present application.
The track structure 10 includes a trough and a rail 110.
The cell body adopts Q235 steel to make, is convenient for purchase and prefabricated processing, compares traditional concrete groove, and the efficiency of construction is higher. The trough body comprises a first vertical plate 122, a second vertical plate 124 and a bottom plate 126, wherein the first vertical plate 122 and the second vertical plate 124 are arranged opposite to the center of the bottom plate 126 at intervals and are connected to the bottom plate 126. The first vertical plate 122, the second vertical plate 124 and the bottom plate 126 can be integrally formed into a concave groove body, or can be formed by connecting in a bolt connection mode. Two mounting holes 1262 are respectively opened on the left and right sides of bottom plate 126, and mounting hole 1262 all is located the recess that first riser 122 and second riser 124 enclose outside. The channel body is secured to the track plate by fasteners extending through mounting holes 1262 to form a section of the track. A section of track formed by a plurality of track structures 10 extends and is spliced along the same axis, and finally, a left track and a right track of a linear subway are formed.
In the embodiments of the present application, terms such as "left, right," and "outer" describing the positional relationship are determined based on the positional relationship in the drawings of the specification, and are not described in detail below.
The rail 110 is disposed within the channel between a first riser 122 and a second riser 124 and is bolted to the base plate 126 at a central location, which facilitates prefabrication. A first base plate 150 is arranged between the steel rail 110 and the base plate 126, and the first base plate 150 is a heightening base plate, so that the geometric shape and position between the steel rail 110 and the base plate 126 can be adjusted; on the other hand, the types of media of the track structure 10 can be increased, so that the multi-layer vibration isolation design of the track structure 10 has a better vibration damping effect.
It should be noted that the embodiment of the present application does not limit the specific form and number of the first shim plate 150, and in some other alternative embodiments, the first shim plate 150 may also be a plurality of height-adjusting shim plates stacked together; or a plurality of heightening cushion plates and a plurality of elastic cushion plates can be included, and the heightening cushion plates and the elastic cushion plates are arranged in a staggered and laminated mode.
One filled channel is formed between the left side of rail 110 and first riser 122 and another filled channel is formed between the right side of rail 110 and second riser 124. And filling high polymer materials are poured into the two filling grooves to form a left damping block 130 and a right damping block 130, and the damping blocks 130 are respectively bonded with the steel rail 110 and the groove body. The polymer material may be vulcanized rubber, thermoplastic polyester elastomer, polyurethane, etc. Because two filling grooves are formed between the steel rail 110 and the first vertical plate 122 and the second vertical plate 124 respectively, when prefabricating, the damping block 130 is formed by directly filling high polymer materials in the filling grooves, and compared with the traditional concrete groove which needs to be cast in situ at the construction site, the construction efficiency is greatly improved.
Each damping block 130 is provided with three holes 132 with different sizes when pouring, a plurality of damping particles 140 are arranged in the holes 132, the damping particles 140 can be elastic materials such as elastic waste plastic particles and rubber particle-wrapped iron balls, and when prefabricating, the materials of the damping blocks 130 are different from the materials of the damping particles 140. Compared with the defects of single energy consumption form and short service life caused by single damping material of the traditional concrete groove track, the damping particles 140 are arranged in the holes 132 in the damping block 130, and in the vibration transmission process, the vibration energy transmitted to the damping block 130 is dissipated through the collision among the damping particles 140 and the damping block 130, so that the vibration energy transmitted to the track structure 10 and the track plate at the lower part of the track structure 10 is less, the aging speed of the damping block 130 is reduced, and the whole service life of the track structure 10 is prolonged. In addition, compared with the vibration reduction and noise reduction performance, the types of media of the track structure 10 are more than those of a concrete groove structure track, the attenuation of elastic waves can be enhanced due to the increase of the cross section of the materials, the vibration is transmitted to the first base plate 150 after being transmitted to the damping block 130 and the damping particles 140 from the steel rail 110, and then is continuously transmitted to the groove body and then is transmitted downwards, the vibration of the concrete groove on the traditional sleeper is transmitted downwards through the fastener system, the transverse vibration is transmitted to the track plate only through the filling materials, and the elastic waves have certain attenuation at the interfaces of different media, so that the multi-layer vibration isolation design of the track structure 10 has a better vibration reduction effect than the design of the concrete groove on the traditional sleeper.
It should be noted that the embodiment of the present application does not limit the shape, specific number and size of the holes 132 in the damping block 130, and in some alternative embodiments, the holes 132 may also be polygonal, may also be set to be one or other specific numbers, and the size of the holes 132 may also be the same.
In addition, an alternative embodiment of the present application also provides a track system comprising a track structure 10, a track bed and a track slab. The track system is a tunnel track system, and the track bed is arranged in the tunnel. In tunnel track system's construction, be subject to the spatial structure in tunnel, adopt prefabricated track structure 10 to lay, for traditional tunnel cast in situ construction, the efficiency of construction can promote by a wide margin.
The track plate is fixed to the track bed, and a groove body in the track structure 10 is connected to the track plate by a fastener penetrating through the mounting hole 1262. Where the fasteners may be bolts, the mounting holes 1262 are correspondingly threaded holes. A second base plate is arranged between the track structure 10 and the track slab, and the structure and composition form of the second base plate are the same as those of the first base plate 150. A second base plate is arranged between the track structure 10 and the track plate, and is used for adjusting the geometric shape and position of the track structure 10 on the construction and laying site; on the other hand, a vibration damping medium is added, and the vibration damping effect of the track system is further improved.
The track system adopts the track structure 10, so that the track system can be prefabricated in advance and does not need to be cast in place; the track structure 10 is installed and connected through fasteners, so that construction is facilitated.
In addition, an optional embodiment of the present application further provides a track construction method for a tunnel, which can effectively improve the efficiency of track construction due to the adoption of the track structure 10 for construction.
Referring to fig. 2, fig. 2 shows a specific flow of a track construction method according to an alternative embodiment of the present application.
The track construction method comprises the following steps:
firstly, excavating a tunnel.
Secondly, paving a track bed.
And thirdly, fixing the track slab. And fixing the track slab on the track bed.
Fourthly, prefabricating the track structure 10. The track structure 10 is prefabricated in the factory according to actual requirements.
And fifthly, fixing the track structure 10. The channel body is secured to the track plate by fasteners inserted through mounting holes 1262.
Sixthly, adjusting the geometric shape and position. The height difference between the track structure 10 and the track slab is adjusted by adding a second shim plate.
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 shall be included in the protection scope of the present application.
Claims (10)
1. A track structure characterized by:
comprises a groove body and a steel rail;
the steel rail is arranged in the groove body and connected with the groove body, and the groove body is provided with a mounting hole used for being connected with the track plate.
2. The track structure of claim 1, wherein:
the groove body comprises a first vertical plate, a second vertical plate and a bottom plate;
the first vertical plate and the second vertical plate are oppositely arranged and are connected to the bottom plate;
the steel rail is connected to the bottom plate and arranged between the first vertical plate and the second vertical plate, and the mounting hole is formed in the bottom plate.
3. The track structure of claim 2, wherein:
a filling groove is formed between the steel rail and the first vertical plate, and another filling groove is formed between the steel rail and the second vertical plate;
and high polymer materials are poured and filled in the two filling grooves to form the damping block.
4. The track structure of claim 3, wherein:
the damping block is provided with a plurality of holes, and damping particles are arranged in the holes.
5. The track structure of claim 2, wherein:
the steel rail is connected with the bottom plate through bolts;
a first base plate is arranged between the steel rail and the bottom plate.
6. The track structure of claim 1, wherein:
the tank body is made of steel.
7. A track system, characterized by:
the track system having the track structure of any one of claims 1-6;
the track system also comprises a track bed and a track slab;
the track slab is installed on the track bed, and a groove body in the track structure is connected to the track slab through a fastener penetrating through the installation hole.
8. The track system of claim 7, wherein:
and a second base plate is arranged between the track structure and the track plate.
9. The track system of claim 7, wherein:
the track system is a tunnel track system, and the track bed is arranged in the tunnel.
10. A rail construction method is characterized by comprising the following steps:
paving a ballast bed;
fixing a track slab on the track bed;
the track structure comprises a groove body and a steel rail, wherein the steel rail is arranged in the groove body and is connected with the groove body, and the groove body is provided with a mounting hole for connecting with the track plate;
and the groove body is fixed on the track plate through a fastener penetrating through the mounting hole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910805175.2A CN110685191A (en) | 2019-08-28 | 2019-08-28 | Track structure, track system and track construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910805175.2A CN110685191A (en) | 2019-08-28 | 2019-08-28 | Track structure, track system and track construction method |
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| Publication Number | Publication Date |
|---|---|
| CN110685191A true CN110685191A (en) | 2020-01-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910805175.2A Pending CN110685191A (en) | 2019-08-28 | 2019-08-28 | Track structure, track system and track construction method |
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| Country | Link |
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| CN (1) | CN110685191A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287034A (en) * | 2020-03-03 | 2020-06-16 | 中国船舶重工集团公司第七一一研究所 | Protective device for tramcar rail |
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| EP0404756A2 (en) * | 1989-06-19 | 1990-12-27 | Allgemeine Baugesellschaft - A. Porr Aktiengesellschaft | Superstructure with rails and method of obtaining the same |
| CN204343108U (en) * | 2014-12-18 | 2015-05-20 | 成都市新筑路桥机械股份有限公司 | A kind of split type continuous support ballast bed system |
| CN105908581A (en) * | 2016-04-21 | 2016-08-31 | 同济大学 | Composite particle damper used for reducing steel rail vibration noise |
| CN206308555U (en) * | 2016-12-23 | 2017-07-07 | 成都市新筑路桥机械股份有限公司 | A kind of novel embedded rail system of subway |
| CN206308558U (en) * | 2016-12-23 | 2017-07-07 | 成都市新筑路桥机械股份有限公司 | A kind of convenient adjustment and the curved section rail system changed |
| CN208328562U (en) * | 2018-06-07 | 2019-01-04 | 成都市新筑路桥机械股份有限公司 | A kind of continuous supporting track rail support groove facilitating maintenance |
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2019
- 2019-08-28 CN CN201910805175.2A patent/CN110685191A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0404756A2 (en) * | 1989-06-19 | 1990-12-27 | Allgemeine Baugesellschaft - A. Porr Aktiengesellschaft | Superstructure with rails and method of obtaining the same |
| CN204343108U (en) * | 2014-12-18 | 2015-05-20 | 成都市新筑路桥机械股份有限公司 | A kind of split type continuous support ballast bed system |
| CN105908581A (en) * | 2016-04-21 | 2016-08-31 | 同济大学 | Composite particle damper used for reducing steel rail vibration noise |
| CN206308555U (en) * | 2016-12-23 | 2017-07-07 | 成都市新筑路桥机械股份有限公司 | A kind of novel embedded rail system of subway |
| CN206308558U (en) * | 2016-12-23 | 2017-07-07 | 成都市新筑路桥机械股份有限公司 | A kind of convenient adjustment and the curved section rail system changed |
| CN208328562U (en) * | 2018-06-07 | 2019-01-04 | 成都市新筑路桥机械股份有限公司 | A kind of continuous supporting track rail support groove facilitating maintenance |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111287034A (en) * | 2020-03-03 | 2020-06-16 | 中国船舶重工集团公司第七一一研究所 | Protective device for tramcar rail |
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Application publication date: 20200114 |