CN108221506A - It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install - Google Patents

It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install Download PDF

Info

Publication number
CN108221506A
CN108221506A CN201810163532.5A CN201810163532A CN108221506A CN 108221506 A CN108221506 A CN 108221506A CN 201810163532 A CN201810163532 A CN 201810163532A CN 108221506 A CN108221506 A CN 108221506A
Authority
CN
China
Prior art keywords
bolt sleeve
fastener
bolt
insulating pad
iron chair
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN201810163532.5A
Other languages
Chinese (zh)
Other versions
CN108221506B (en
Inventor
江万红
庞玲
姚力
苏乾坤
刘大园
杜华杨
刘伟
巫江
易佳俊
张鹏
翟淼
徐锡江
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Railway Eryuan Engineering Group Co Ltd CREEC
Original Assignee
China Railway Eryuan Engineering Group Co Ltd CREEC
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by China Railway Eryuan Engineering Group Co Ltd CREEC filed Critical China Railway Eryuan Engineering Group Co Ltd CREEC
Priority to CN201810163532.5A priority Critical patent/CN108221506B/en
Publication of CN108221506A publication Critical patent/CN108221506A/en
Application granted granted Critical
Publication of CN108221506B publication Critical patent/CN108221506B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00Fastening rails on sleepers, or the like
    • E01B9/68Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00Fastening rails on sleepers, or the like
    • E01B9/38Indirect fastening of rails by using tie-plates or chairs; Fastening of rails on the tie-plates or in the chairs
    • E01B9/44Fastening the rail on the tie-plate
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00Fastening rails on sleepers, or the like
    • E01B9/68Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • E01B9/681Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by the material
    • EFIXED CONSTRUCTIONS
    • E01CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01BPERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
    • E01B9/00Fastening rails on sleepers, or the like
    • E01B9/68Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair
    • E01B9/685Pads or the like, e.g. of wood, rubber, placed under the rail, tie-plate, or chair characterised by their shape

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Signs Or Road Markings (AREA)
  • Joining Of Building Structures In Genera (AREA)

Abstract

It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install, to ensure the normal service performance of fastener system, solve together existing fastener system easily occur in the construction stage concrete cracks and operation two benches cannot bring great convenience to the technical barrier that it is repaired to line construction and operation maintenance.Including fastener iron chair, insulating pad, bolt sleeve and anchor bolt, insulating pad is set under fastener iron chair bottom surface, and bolt sleeve is embedded in concrete column, and the lower part of anchor bolt passes through fastener iron chair and insulating pad to be threadedly coupled with bolt sleeve.Lower iron chair is set under insulating pad bottom surface, and the lower part of the lower bolster is sunk in concrete column, upper surface exposure concrete column surface certain altitude.Anchor bolt mounting hole, bolt sleeve location hole coaxial and that form stepped hole are opened up in lower bolster plate face, bolt sleeve upper end shirt rim is pressed on the axial end wall in the stepped hole.Fluid sealant is perfused in gap between bolt sleeve top peripheral wall and bolt sleeve location hole internal perisporium.

Description

It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install
Technical field
The present invention relates to railroad tracks, more particularly to a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install System.
Background technology
For urban track traffic, state-owned railroads or magnetic railway, adopted in parking lot, rolling stock section and part main track location With solid concrete roabed structure, and direct burial fastener system is matched, wherein more typical case is column check pit track.Using tradition The monolithic roadbed track structure composition of direct burial fastener system includes rail, fastener, railway roadbed, not using sleeper.Rail uses The new rails of 50kg/m or 60kg/m, fastener use reinforced concrete cast-in-situ structure using elastic separated rail fastening, solid concrete roabed.Fastener Assembling section of track when direct burial is constructed, using form of construction work from top to bottom, fastener nylon sleeve is directly anchored in cast-in-place mixed In solidifying soil.
By investigating a plurality of circuit to have put into effect, there is the following disease in traditional direct burial fastener system, led to Analysis and summary are crossed, typical disease mainly there are following three aspects:(1) rubber cushion fails to fit closely with iron chair under iron chair, makes When being poured into railway roadbed aggregate penetrate into binding face, when train passes through, iron chair lower part cannot uniform pressure-bearing, iron chair tilt Cause service sleeve local pressure excessive, occur concrete cracking at casing;(2) nylon sleeve is crooked, and spiral shell is anchored in casing The pulling capacity being not only vertically oriented that bolt is born, casing oblique loading during driving cause casing circumferential concrete to cleave;(3) When pouring railway roadbed, fastener iron chair is buried by concrete, and the iron chair after burial and concrete form rigid overlap joint, but by Under iron chair there is certain elasticity in rubber cushion, when train passes through iron chair to bottom offset, cause the concrete ring that contacts to By shear stress, lead to concrete splitting.More than disease once being formed, will jeopardize traffic safety, even if original fastener direct-burried Formula scheme does not cause to do over again in the construction time, is also not have fastener to replace condition in the operation phase, is brought greatly to operation maintenance It is difficult.
Invention content
The technical problems to be solved by the invention, which are to provide, a kind of reduces railway roadbed hurt and direct burial fastener easy to install System to ensure the normal service performance of fastener system, solves existing fastener system and concrete easily occurs in the construction stage together Crackle and operation two benches cannot bring greatly just the technical barrier that it is repaired to line construction and operation maintenance Profit.
The technical solution adopted by the present invention to solve the technical problems is as follows:
The a kind of of the present invention reduces railway roadbed hurt and direct burial fastener system easy to install, including fastener iron chair, absolutely Edge backing plate, bolt sleeve and anchor bolt, insulating pad are set under fastener iron chair bottom surface, and bolt sleeve is embedded in concrete In column, the lower part of anchor bolt passes through fastener iron chair and insulating pad to be threadedly coupled with bolt sleeve, it is characterized in that:It is described Lower iron chair is set under insulating pad bottom surface, and the lower part of the lower bolster is sunk in concrete column, upper surface exposure concrete Leg surface certain altitude;Anchor bolt mounting hole, bolt sleeve coaxial and that form stepped hole are opened up in the lower bolster plate face Pipe location hole, bolt sleeve upper end shirt rim are pressed on the axial end wall in the stepped hole;The bolt sleeve top peripheral wall Fluid sealant is perfused in gap between bolt sleeve location hole internal perisporium.
The plate face of the lower bolster is rectangular, and anchor rib, the upper end of each anchor rib and underlay are arranged at intervals on lower face The lower face welding of plate.
The spiral bar on the bolt sleeve periphery is weldingly fixed on the lower bolster lower plate outside bolt sleeve location hole lower port On face.
The beneficial effects are mainly as follows following aspects:
1st, after anchor bolt reinforcing, lower bolster makes insulating pad be tightly attached to fastener iron chair bottom surface, and the lower part of lower bolster sinks Enter in concrete column, and upper surface then exposure concrete column surface certain altitude, avoiding insulating pad is contaminated, simultaneously Fastener iron chair is avoided just to have taken with concrete;
2nd, bolt sleeve is by hoop constraint in the bolt sleeve location hole of lower bolster, and by reliable fixation, axis hangs down It is no longer crooked directly in lower bolster plate face.The spiral bar on bolt sleeve periphery is weldingly fixed in the plate face of lower bolster, is effectively solved The problem of spiral bar can not position;
3rd, lower bolster is flat surface, and condition is provided to fastener installation, replacement;The anchor welded on the lower face of lower bolster Muscle is embedded in concrete column, is shared the larger pulling capacity that bolt sleeve is born jointly with spiral bar, be can effectively prevent bolt Periphery of spigot concrete cracking.
The present invention has the characteristics that simple in structure, anti-cracking concrete effect is good, easy construction, and construction time unit is laid a railway track kilometer About 300,000 yuan of construction cost can be reduced;Existing fastener system is solved together easily occurs concrete cracks and operation two in the construction stage Stage cannot bring great convenience to the problem that it is repaired to line construction and operation maintenance;Economic and social benefit Significantly, there is wide popularizing application prospect.
Description of the drawings
This specification includes following four width attached drawing:
Fig. 1 is a kind of cross-section diagram for reducing railway roadbed hurt and direct burial fastener system easy to install of the present invention;
Fig. 2 is the enlarged drawing of A parts in Fig. 1;
Fig. 3, which is that the present invention is a kind of, reduces looking up for lower bolster in railway roadbed hurt and direct burial fastener system easy to install Figure;
Fig. 4 is the sectional view of the line B-B along Fig. 3.
Component and corresponding label are shown in figure:Concrete column 10, rail 11, fastener iron chair 20, insulating pad 21, Lower bolster 22, anchor bolt mounting hole 221, bolt sleeve location hole 222, fluid sealant 23, bolt sleeve 24, spiral bar 25, anchor Gu muscle 26, anchor bolt 27, spring 28.
Specific embodiment
The present invention is further described with reference to the accompanying drawings and examples.
Referring to Figures 1 and 2, it is of the invention it is a kind of reduce railway roadbed hurt and direct burial fastener system easy to install, including Fastener iron chair 20, insulating pad 21, bolt sleeve 24 and anchor bolt 27, insulating pad 21 are set to 20 bottom of fastener iron chair Under face, bolt sleeve 24 is embedded in concrete column 10, and the lower part of anchor bolt 27 passes through fastener iron chair 20 and felt pad Plate 21 is threadedly coupled with bolt sleeve 24.Lower bolster 22 is set under 21 bottom surface of insulating pad, and the lower part of the lower bolster 22 sinks Enter in concrete column 10,10 surface certain altitude of upper surface exposure concrete column.Reference Fig. 2 and Fig. 3, Fig. 4, under described Anchor bolt mounting hole 221, bolt sleeve location hole 222 coaxial and that form stepped hole, bolt sleeve are opened up in 22 plate face of backing plate 24 upper end shirt rim of pipe is pressed on the axial end wall in the stepped hole.The 24 top peripheral wall of bolt sleeve is determined with bolt sleeve Fluid sealant 23 is perfused in gap between 222 internal perisporium of position hole.After anchor bolt 27 reinforces, lower bolster 22 makes insulating pad 21 tight 20 bottom surface of fastener iron chair is affixed on, the lower part of lower bolster 22 is sunk in concrete column 10, will not generate slip or dislocation, and Its upper surface then 10 surface certain altitude of exposure concrete column, avoids insulating pad 21 and is contaminated in cast-in-place concrete, Simultaneously fastener iron chair 20 is avoided just to have taken with concrete.Bolt sleeve 24 is in the bolt sleeve location hole 222 of lower bolster 22 By hoop constraint, by reliable fixation, axis is no longer crooked perpendicular to 22 plate face of lower bolster.
With reference to Fig. 2, the spiral bar 25 on 24 periphery of bolt sleeve is weldingly fixed on 222 lower port of bolt sleeve location hole On outer 22 lower face of lower bolster, solve the problems, such as that spiral bar 25 can not position.
With reference to Fig. 3 and Fig. 4, the plate face of the lower bolster 22 is rectangular, and plate face is smooth, is provided to fastener installation, replacement Condition.Anchor rib 26 is arranged at intervals on 22 lower face of lower bolster, the upper end of each anchor rib 26 is welded with the lower face of lower bolster 22. Dowel 26 is embedded in concrete column 10, is shared the larger pulling capacity that bolt sleeve 24 is born, be can effectively prevent bolt sleeve 24 periphery concrete crackings.
The above only explains through diagrams, and the present invention is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install Some principles of system are not intended to the present invention being confined in shown and described concrete structure and the scope of application, therefore every institute It is possible that the corresponding modification being utilized and equivalent, belong to the apllied the scope of the claims of the present invention.

Claims (3)

1. a kind of reduce railway roadbed hurt and direct burial fastener system easy to install, including fastener iron chair (20), insulating pad (21), bolt sleeve (24) and anchor bolt (27), insulating pad (21) are set under fastener iron chair (20) bottom surface, bolt sleeve Pipe (24) is embedded in concrete column (10), and the lower part of anchor bolt (27) passes through fastener iron chair (20) and insulating pad (21) it is threadedly coupled with bolt sleeve (24), it is characterized in that:Lower bolster (22) is set under insulating pad (21) bottom surface, under this The lower part of backing plate (22) is sunk in concrete column (10), upper surface exposure concrete column (10) surface certain altitude;Institute It states and anchor bolt mounting hole (221), bolt sleeve location hole coaxial and that form stepped hole is opened up in lower bolster (22) plate face (222), bolt sleeve (24) upper end shirt rim is pressed on the axial end wall in the stepped hole;It is outer at the top of the bolt sleeve (24) Fluid sealant (23) is perfused in gap between peripheral wall and bolt sleeve location hole (222) internal perisporium.
2. a kind of as described in claim 1 reduce railway roadbed hurt and direct burial fastener system easy to install, it is characterized in that:Institute The plate face for stating lower bolster (22) is rectangular, anchor rib (26) is arranged at intervals on lower face, the upper end of each anchor rib (26) is under The lower face welding of backing plate (22).
3. a kind of as described in claim 1 reduce railway roadbed hurt and direct burial fastener system easy to install, it is characterized in that:Institute The spiral bar (25) for stating bolt sleeve (24) periphery is weldingly fixed on lower bolster outside bolt sleeve location hole (222) lower port (22) on lower face.
CN201810163532.5A 2018-02-27 2018-02-27 Direct-buried fastener system capable of reducing track bed injury and easy to install Active CN108221506B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201810163532.5A CN108221506B (en) 2018-02-27 2018-02-27 Direct-buried fastener system capable of reducing track bed injury and easy to install

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201810163532.5A CN108221506B (en) 2018-02-27 2018-02-27 Direct-buried fastener system capable of reducing track bed injury and easy to install

Publications (2)

Publication Number Publication Date
CN108221506A true CN108221506A (en) 2018-06-29
CN108221506B CN108221506B (en) 2024-01-05

Family

ID=62662308

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201810163532.5A Active CN108221506B (en) 2018-02-27 2018-02-27 Direct-buried fastener system capable of reducing track bed injury and easy to install

Country Status (1)

Country Link
CN (1) CN108221506B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111041900A (en) * 2019-12-01 2020-04-21 中铁二院工程集团有限责任公司 Single-toe elastic strip buckling type magnetic suspension fastener system
CN111218865A (en) * 2020-03-09 2020-06-02 中铁二院工程集团有限责任公司 Adjustable split type medium-low speed magnetic suspension fastener system
CN112523009A (en) * 2019-09-17 2021-03-19 洛阳双瑞橡塑科技有限公司 Fastener system mounting structure and construction process

Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB535366A (en) * 1939-02-03 1941-04-07 Resilient Products Corp Improvements in or relating to tie plate arrangements for railroads
CN2421312Y (en) * 1999-11-29 2001-02-28 铁道部鞍山工务器材厂 Preburied plastic sleeve and screw spike for concrete sleeper
KR200319318Y1 (en) * 2003-04-16 2003-07-07 주식회사 동양하이켐 Vibration prevention system of railroad
CN101014743A (en) * 2004-04-29 2007-08-08 Bwg股份有限两合公司 Fixing for a rail and arrangement for fixing rails
KR100973088B1 (en) * 2009-11-27 2010-08-03 한국철도시설공단 A fixing member for a concrete insert being used in railroad tie
JP2011006938A (en) * 2009-06-26 2011-01-13 Sekisui Chem Co Ltd Sleeper and manufacturing method of sleeper
CN201778253U (en) * 2010-08-11 2011-03-30 中铁工程设计咨询集团有限公司 Crimping base plate of embedded part
KR20110090115A (en) * 2010-02-02 2011-08-10 조경호 Concrete ballast rail accepting dusproof pad having improved structure
CN201962561U (en) * 2011-03-23 2011-09-07 中铁二院工程集团有限责任公司 Urban railway system track fastener
CN102619145A (en) * 2011-01-26 2012-08-01 北京易科路通铁道设备有限公司 Longitudinal beam type sleeper system
CN203546532U (en) * 2013-09-30 2014-04-16 中铁二院工程集团有限责任公司 High-speed railway ballast track steel rail fastener system
US20160230352A1 (en) * 2013-09-18 2016-08-11 Vossloh-Werke Gmbh Plate Element for a Fastening Point at Which a Rail, Which is Provided for Rail Vehicles, is Fastened and Fastening Point
CN206752212U (en) * 2017-05-10 2017-12-15 中原利达铁路轨道技术发展有限公司 A kind of rail fixed structure for heavy haul railway
CN208072096U (en) * 2018-02-27 2018-11-09 中铁二院工程集团有限责任公司 It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install

Patent Citations (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB535366A (en) * 1939-02-03 1941-04-07 Resilient Products Corp Improvements in or relating to tie plate arrangements for railroads
CN2421312Y (en) * 1999-11-29 2001-02-28 铁道部鞍山工务器材厂 Preburied plastic sleeve and screw spike for concrete sleeper
KR200319318Y1 (en) * 2003-04-16 2003-07-07 주식회사 동양하이켐 Vibration prevention system of railroad
CN101014743A (en) * 2004-04-29 2007-08-08 Bwg股份有限两合公司 Fixing for a rail and arrangement for fixing rails
JP2011006938A (en) * 2009-06-26 2011-01-13 Sekisui Chem Co Ltd Sleeper and manufacturing method of sleeper
KR100973088B1 (en) * 2009-11-27 2010-08-03 한국철도시설공단 A fixing member for a concrete insert being used in railroad tie
KR20110090115A (en) * 2010-02-02 2011-08-10 조경호 Concrete ballast rail accepting dusproof pad having improved structure
CN201778253U (en) * 2010-08-11 2011-03-30 中铁工程设计咨询集团有限公司 Crimping base plate of embedded part
CN102619145A (en) * 2011-01-26 2012-08-01 北京易科路通铁道设备有限公司 Longitudinal beam type sleeper system
CN201962561U (en) * 2011-03-23 2011-09-07 中铁二院工程集团有限责任公司 Urban railway system track fastener
US20160230352A1 (en) * 2013-09-18 2016-08-11 Vossloh-Werke Gmbh Plate Element for a Fastening Point at Which a Rail, Which is Provided for Rail Vehicles, is Fastened and Fastening Point
CN203546532U (en) * 2013-09-30 2014-04-16 中铁二院工程集团有限责任公司 High-speed railway ballast track steel rail fastener system
CN206752212U (en) * 2017-05-10 2017-12-15 中原利达铁路轨道技术发展有限公司 A kind of rail fixed structure for heavy haul railway
CN208072096U (en) * 2018-02-27 2018-11-09 中铁二院工程集团有限责任公司 It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
辛学忠;吴克俭;: "铁路客运专线无碴轨道扣件探讨", 铁道工程学报, no. 02 *
邢俊;蔡敦锦;田春香;王平;: "基于Ⅲ型弹条的新型地铁扣件设计研究", 铁道建筑, no. 10 *

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112523009A (en) * 2019-09-17 2021-03-19 洛阳双瑞橡塑科技有限公司 Fastener system mounting structure and construction process
CN111041900A (en) * 2019-12-01 2020-04-21 中铁二院工程集团有限责任公司 Single-toe elastic strip buckling type magnetic suspension fastener system
CN111218865A (en) * 2020-03-09 2020-06-02 中铁二院工程集团有限责任公司 Adjustable split type medium-low speed magnetic suspension fastener system

Also Published As

Publication number Publication date
CN108221506B (en) 2024-01-05

Similar Documents

Publication Publication Date Title
WO2017125028A1 (en) Rail support beam low track and viaduct transition section structure for medium-low-speed magnetic suspension traffic project
CN108221506A (en) It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install
WO2017185906A1 (en) Transitional structure for turnout and non-turnout zones in low-set, mid-to-low speed magnetic levitation lines
CN103174071B (en) Construction technology of short sleeper vibration attenuation fastener with improved structure replacing elasticity short sleeper
CN108914714B (en) Assembly type sleeper plate type or track plate type ballastless track structure and assembly method
US3300140A (en) Beams for railroad track structure
WO2017185917A1 (en) Inter-segment limiting structure having clawed ends for track-bearing beam in single track section of low-set line of mid-to-low speed magnetic levitation transportation project
CN208072096U (en) It is a kind of to reduce railway roadbed hurt and direct burial fastener system easy to install
CN117738032A (en) Ballastless track temporary supporting structure and ballastless track deformation renovation method
CN107988854B (en) Later-stage reservation structure of subway upper cover vehicle base parking train inspection warehouse
CN215947748U (en) Prefabricated combined assembled ballast bed
WO2022126535A1 (en) Boltless fastener system for heavy-haul railways
CN112211037B (en) Ballast track with adjustable rigid foundation and sleeper thereof
CN210657807U (en) Steel sleeper capable of replacing ballast bed as bearing structure
CN100595380C (en) Rail fastening piece
CN106702826A (en) Railway fastener system without elastic strip
CN103835190A (en) Double-block concrete sleeper for installing auxiliary steel rails
KR20220048495A (en) Labor saving ballast track structure having sleeper fixing and supporting apparatus for securing longitudinal and transverse axial, and construction method for the same
CN207933821U (en) A kind of compound ballastless track system of rail traffic Superimposed
CN111877054A (en) Prefabricated plate type track structure convenient for rapid construction and construction method thereof
JP3798210B2 (en) Prestress ballast track structure
CN210561471U (en) Steel track bed board track structure
CN117626721B (en) Construction method of ballastless track system for isolating foundation deformation
CN220335598U (en) Novel double-block type concrete sleeper structure for station wiring and access lines
CN217710099U (en) Sleeper buried ballastless track

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant