CN108951323A - A kind of Ballast track laying method - Google Patents
A kind of Ballast track laying method Download PDFInfo
- Publication number
- CN108951323A CN108951323A CN201810883161.8A CN201810883161A CN108951323A CN 108951323 A CN108951323 A CN 108951323A CN 201810883161 A CN201810883161 A CN 201810883161A CN 108951323 A CN108951323 A CN 108951323A
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- China
- Prior art keywords
- rail
- sleeper
- ballast
- laying method
- track laying
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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
- E01B29/00—Laying, rebuilding, or taking-up tracks; Tools or machines therefor
- E01B29/16—Transporting, laying, removing, or replacing rails; Moving rails placed on sleepers in the track
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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 invention discloses a kind of Ballast track laying methods, comprising the following steps: step A: sleeper is laid with the first preset spacing；Step B: rail is pushed in the rail support groove of sleeper.Sleeper is first laid with the first preset spacing, then, rail is pushed in the rail support groove of sleeper by Ballast track laying method provided by the invention.It avoids using tool track as inventory stock rails, reduces the process of Ballast track gapless track construction.
Description
Technical field
The present invention relates to train rail laying method technical fields, more particularly, to a kind of Ballast track laying method.
Background technique
The construction of Ballast track gapless track, which generallys use, changes laid process, i.e., is first laid with 25m standard tool using section of track track-laying machine
The section of track recycles gapless line transport trainset to unload gapless line to pillow shoulder, and tool track of then dismantling, the artificial long rail string that carries out changes paving.
Changing laid process needs a large amount of tool tracks as inventory stock rails, complex procedures.
Therefore, the process for how reducing the construction of Ballast track gapless track is those skilled in the art's technology urgently to be resolved
Problem.
Summary of the invention
In view of this, the object of the present invention is to provide a kind of Ballast track laying method, to reduce Ballast track Sutureless
The process of road construction.
To achieve the goals above, the present invention provides following schemes:
A kind of Ballast track laying method, comprising the following steps:
Step A: sleeper is laid with the first preset spacing；
Step B: rail is pushed in the rail support groove of the sleeper.
Further include step C before the step A in a specific embodiment:
The base of rail to be laid is selected, and arranges III accurate measurement net of CP.
Further include step D between the step A and the step C in a specific embodiment:
First of tiny fragments of stone, coal, etc. is laid on the base.
Further include step E between the step A and the step D in a specific embodiment:
Store the rail, the sleeper and first railway ballast.
In a specific embodiment, in the step E, the rail is stored in the base, and the sleeper is logical
Cross batten and be divided into the second default layer stacking along the base, and the bottom of the sleeper and the base along between
It is provided with isolation strip, first railway ballast is stored in along the base.
In a specific embodiment, in the step B, the bottom end of the rail is equipped with rubber mat plate, described to hold
It is placed with roller in track slot, and removes the rolling after rail pushes in place at a distance of third pre-determined distance between the roller
Cylinder, the rail is fallen in the rail support groove, and is fixed the rail and the sleeper by snap fit part, and pre- every the 4th
If the snap fit part is installed in a snap fit part installation position, rail head is placed between the rail gap of the adjacent rail, and removable by bolt
Unload connection.
Further include step F after the step B in a specific embodiment:
Spacing and the angle for adjusting the rail are upright, and will install the snap fit on remaining snap fit part installation position
Part.
Further include step G after the step F in a specific embodiment:
The tiny fragments of stone, coal, etc. in layering, so that the railway ballast face of the second railway ballast formed after the upper tiny fragments of stone, coal, etc. is lower than the sleeper surface of the sleeper.
Further include step H after the step G in a specific embodiment:
By the rail welding at the unit rail section of the 5th preset length, destressing is carried out to the rail and is locked.
Further include step I after the step H in a specific embodiment:
The track that accurate adjustment is laid with, and check and accept.
Each embodiment according to the present invention can according to need any combination, resulting embodiment party after these combinations
Case is also a part of the specific embodiment of the invention within the scope of the present invention.
It can be seen from the above technical scheme that Ballast track laying method provided by the invention, first by sleeper with first
Preset spacing is laid with, and then, rail is pushed in the rail support groove of sleeper.It avoids using tool track as turnover
Rail reduces the process of Ballast track gapless track construction.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is the flow chart of Ballast track laying method provided by the invention；
Fig. 2 is the schematic view of the front view of sleeper pile provided by the invention；
Fig. 3 is the left view structural representation of Fig. 2；
Fig. 4 is the storage configuration schematic diagram of roadbed location provided by the invention sleeper and railway ballast；
Fig. 5 is the storage configuration schematic diagram of bridge location provided by the invention sleeper and railway ballast.
Wherein, in Fig. 1-5:
Sleeper 1, cable trough 2, ditch 3, the first railway ballast 4, square wood strip 5, tiny fragments of stone, coal, etc. band 6.
Specific embodiment
It is with reference to the accompanying drawing and specific real in order to make those skilled in the art better understand technical solution of the present invention
Applying mode, the present invention is described in further detail.
Fig. 1-5 is please referred to, is the flow chart of Ballast track laying method provided by the invention.
The invention discloses a kind of Ballast track laying methods, comprising the following steps:
Step S1: sleeper 1 is laid with the first preset spacing.
When first preset spacing refers to that sleeper 1 is spread, technical staff is according between the calculated sleeper 1 of skirt piles point
Away from.
In the present embodiment, technical staff calculates the position of sleeper 1 according to skirt piles point, and string has first been drawn then to lime
Line, lime line should be thin as far as possible.To reduce by 1 spacing accumulated error of sleeper, reduces subsequent side and rest the head on workload, technical staff's handle
24m section is subdivided into 10 segments, i.e. mono- section of 2.4m, is marked with lime line, then hangs using excavator lifting is homemade
Tool dissipates pillow, often hangs 4, spacing 60cm.Shown in following Fig. 2 and 3.
Step S2: rail is pushed in the rail support groove of sleeper 1.
Using push method one-time laying rail: laying a railway track unit from small mileage to big mileage direction or so line using WZ500
Alternately it is laid with 500m rail.The bottom end of rail is equipped with rubber mat plate, is placed with roller in rail support groove, and pre- at a distance of third between roller
If distance, after rail pushes in place, roller is removed, rail is fallen in rail support groove, and consolidates rail and sleeper 1 by snap fit part
It is fixed, and a snap fit part installation position installing tache accessory is preset every the 4th, rail head is placed between the rail gap of adjacent rail, and pass through spiral shell
Bolt is detachably connected.
Rubber mat plate should be installed before push in advance, the third pre-determined distance of roller apart is 10m in the present embodiment, to subtract
Light resistance.Rail can be pushed directly, can also be drawn in place by tractor.In the present embodiment, with the 4th default for 3
For, i.e. snap fit part is tightened together on four.Two adjacent rail joint gaps place the short rail head (length 5cm) to have drilled,
Then it is temporarily connected with fish platee and high-strength bolt.
Sleeper 1 is first laid with by Ballast track laying method provided by the invention with the first preset spacing, then,
Rail is pushed in the rail support groove of sleeper 1.It avoids using tool track as inventory stock rails, reduces Ballast track gapless track
The process of construction.
Embodiment two
It is provided in another embodiment in the present invention, having in the Ballast track laying method and embodiment one in the present embodiment
Tiny fragments of stone, coal, etc. track laying method is similar, just repeats no more to something in common, only introduces difference.
In the present embodiment, further include step S3 before disclosing step S1: selecting the base of rail to be laid, and arrange
III accurate measurement net of CP.
Wherein, the construction in base will be according to topographic and geologic, conditions of transportation reasonable plant-site selection, in line with saving the area, save
Investment, environmental protection and energy saving, reasonable and practical principle, meet that material supply, that train enters and leaves is convenient, shunting service is smooth etc. wants
It asks.
Construction, which needs to measure by CP III, can meet required precision, first set to the measurement of CP III survey that arrange net, measurement at
After fruit meets the requirements, controlled for track construction.
Further, the invention discloses further include step S4 between step S1 and step S3: is laid on base
One railway ballast 4.
The test of 4 Paving Techniques of the first railway ballast is carried out after marching into the arena first, determines pave virtual resurfacing thickness and number of rolling.Through trying
It tests, round trip is 1 time, and the first railway ballast 4 is after 12t dual-steel wheel road roller static pressure 2~3 times, and thickness can reduce under normal circumstances
About 10%, i.e., if empty paving 25cm is thick, rear thickness 22.5cm is rolled, according to laboratory measurement, 4 bulk density of the first railway ballast is
1.68g/cm3, after rolling, 4 compactness of the first railway ballast is in 1.80g/cm3More than, it overlays 4 thickness of the first railway ballast and compacted density is equal
Reach acceptance specification requirement.
Before first railway ballast 4 paves, the laying work of skirt piles point should be completed, is 4 paving thickness of the first railway ballast and flatness
Control is ready.The tiny fragments of stone, coal, etc. face altitude traverse of the first railway ballast 4 should be drawn on contact net bar to (bridge section can simultaneously when skirt piles point is set
Label is keeping off tiny fragments of stone, coal, etc. side within the walls), facilitate control work when construction.Straight line location is every 50m left and right settings skirt piles point, 3 in Curve Segment
Appropriate encryption, is arranged every 20~25m.
First railway ballast 4 paves, and there are two types of modes: one is to carry out the work that paves using the multi-functional bottom tiny fragments of stone, coal, etc. paver of MTT9000 type
Make, secondly for slightly put down using loading machine+land leveller essence is flat+" three-piece " unit equipment for rolling of road roller paves.Roadbed
Location carries out two-wire and paves construction because sleeper 1 is placed in route two sides, and selection slightly put down using loading machine+and land leveller essence is flat+
" three-piece " unit equipment that road roller rolls paves.Bridge location or so line sleeper is placed in right side, and occupies
Right line work surface, selection carry out left line using the multi-functional bottom tiny fragments of stone, coal, etc. paver of MTT9000 type and pave, and pave to the left line bottom tiny fragments of stone, coal, etc. and sleeper
After the completion of distribution, remaining sleeper is carried to left line, then slightly put down using loading machine+land leveller essence is flat+road roller roll " three
Part set " the unit equipment right line that pave paves construction.
In first railway ballast, 4 paving process, survey crew, which is joined a regular shift or class, checks the elevation that paves, the tiny fragments of stone, coal, etc. face of the first railway ballast of strict control 4
Absolute altitude and flatness, finding should remind construction personnel to be adjusted in time when thickness and flatness deficiency (manually takes off low or mends
The tiny fragments of stone, coal, etc.), it can be rolled after the completion of adjustment.After the completion of first railway ballast 4 paves, thickness meets the requirements, and tiny fragments of stone, coal, etc. surface evenness reaches 20mm/
3m, wire center must not be raised, avoid sleeper fracture.
It further include step S5 between step S1 and step S4 in a specific embodiment: storage rail, sleeper 1
With the first railway ballast 4.
Specifically, rail is stored in base, and sleeper 1 is divided into the second default layer stacking along base by batten, and
It is provided with isolation strip between along the bottom of sleeper 1 and base, the first railway ballast 4 is stored in along base.
Before trackways engineering construction, rail should store abundance and meet construction task requirement.Sleeper and manufacturer are linked up
It is nearby laid in advance by the direct automotive of sleeper factory to roadbed along the line or the riding track of bridge two sides, is not required to be stored in tracklaying base.It deposits
Want open, substantially flat in pillow place.In the present embodiment, with the second default layer for 5 layers, isolation strip is for square wood strip 5, sleeper is deposited
It puts by 4 every layer, is used as a pile (every pile 20) neatly packed for totally 5 layers, is separated by between layers using square wood strip 5.Sleeper bottom
Layer not directly touch the ground, and rubble can be used and be laid to tiny fragments of stone, coal, etc. band 6,6 height about 20~30cm of tiny fragments of stone, coal, etc. band, to hang steel wire when upside-down mounting
Rope lifting.Storage quantity is according to the extent of supply and deposits pillow place size calculating determination.
First railway ballast 4, sleeper storage location are located at Along Railway, place should meet distance line is relatively close, communications and transportation just
Benefit, place it is flat it is open, construction earthwork is few etc. requires, place size should meet the first railway ballast 4, sleeper need in the extent of supply
The amount of asking.
Temporarily wash Zha Chang should along rationally, be uniformly distributed, thus the haul distance had bad luck of the first railway ballast 4 of control, it is also contemplated that washing
The factors such as the electricity consumption of tiny fragments of stone, coal, etc. equipment and staff's life.
Further, after storage rail, sleeper 1 and the first railway ballast 4, it is also necessary to which engineering joins under line.
Because the first railway ballast 4 and sleeper 1 need to be had bad luck by riding track on roadbed (bridge floor), unit of laying a railway track must be in advance to route
Riding track along the line is investigated, and roadbed top surface and bridge elevation cannot be below design altitude, avoids increasing upper tiny fragments of stone, coal, etc. quantity.In transfer
Hold also comprising data such as design drawing, measurement control stake positions.
Under line after engineering handover, sleeper 1 and the first railway ballast 4 are also had bad luck.
Sleeper 1 is had bad luck through reserved riding track to roadbed (bridge floor) by automobile after roadbed is transferred, each shipment 100~120
Left and right, it is contemplated that the gradient of riding track prevents sleeper from toppling on haulage vehicle using wire cable strengthening.
Sleeper 1 needs crane to cooperate when unloading, and is required according to construction speed, unload can sectional multiple spot simultaneously into.
Because roadbed location differs larger with bridge location top surface overall with, to guarantee to reserve enough porte-cocheres, rail
It is also different to rest the head on stacking form.
Roadbed location: because of two-wire roadbed top surface overall with 13.4m, sleeper 1 is detachable in route two sides, every section of 24m, every side dumping 40
Root, two sides totally 24 ÷ 0.6 × 2=80 root.As shown in Figure 4.
Bridge location: double track bridge keep off tiny fragments of stone, coal, etc. wall between overall with 9.0m, sleeper 1 can only all be discharged at route unilateral side, every section 24m,
Unilateral side unloads 80, keeps the other side unimpeded.As shown in Figure 5.
After sleeper 1 is unloaded, the first railway ballast 4 is unloaded between two sleeper piles, every 24m unloads tiny fragments of stone, coal, etc. amount about 52~58m3, guarantee
Thickness can reach 20~25cm after 4 decking and rolling of the first railway ballast in 24m section.If 3 in Curve Segment, it should suitably increase by first
Railway ballast 4, silent partners appropriate superelevation when to overlay avoid occurring surpassing in reverse high influence traffic safety after laying a railway track.
Dumper should carry out apolegamy in advance, meet 2 the first railway ballast of vehicle, 4 about 52~58m3, can accelerate to unload tiny fragments of stone, coal, etc. progress, entrucking side
Amount is also consistent as far as possible, so as to realize that all fronts bottom tiny fragments of stone, coal, etc. paving thickness is almost the same, loading machine is avoided to have bad luck first back and forth
Railway ballast 4 guarantees construction speed and quality.
Further, the invention discloses further include step S6 after step S2: spacing and the angle for adjusting rail are upright,
And by installing tache accessory on remaining snap fit part installation position.
Track-laying machine on rail by drawing point side's pillow, polishing residue snap fit part in time afterwards, in order to avoid the route buck of rail.3 in Curve Segment
When side's pillow, due to sweep difference, right line is caused also to have certain stroke relative to left line length, therefore when right line side pillow
It is considered as the stroke as caused by sweep difference.Long steel ruler should be used when drawing point, can reduce human error.Sleeper spacing
Tolerance be ± 20mm, and continuous 6 sleepers apart from tolerance ± 30mm.
Further, the invention discloses further include step S7 after step S6:
The tiny fragments of stone, coal, etc. in layering, so that the railway ballast face of the second railway ballast formed after the upper tiny fragments of stone, coal, etc. is lower than the sleeper surface of sleeper 1.
The upper tiny fragments of stone, coal, etc. is layered using old K vehicle, upper tiny fragments of stone, coal, etc. work should be completed before big machine is made firm by ramming, guarantee that the second railway ballast is full, meet
Big machine raises track, makes requirement firm by ramming, otherwise can produce bigger effect to big machine track lifting effect.The tiny fragments of stone, coal, etc. should be full as far as possible on first time, and second
It is considered as weldering rail release when the secondary upper tiny fragments of stone, coal, etc. to require, guarantees that 1 pillow top of sleeper is higher than the second railway ballast 4 enough and after second big machine raises track
The railway ballast face of second railway ballast.The subsequent benefit tiny fragments of stone, coal, etc. should flexibly be controlled according to big machine track lifting amount and on-site actual situations, reduce railway roadbed appearance
The second railway ballast has bad luck quantity during arrangement.
It is supported using big machinery, weldering rail release should be substantially met by playing Track regularity and position of center line after track lining twice
It is required that.3 in Curve Segment can suitably increase track lining number, silent partners superelevation is made to reach 80% of design value or more because of silent partners superelevation.
It after welding rail release, then carries out 1~2 time and plays track lining, so that route elevation, direction, ride comfort, superelevation etc. is reached track accurate adjustment and want
It asks.
Further, the invention discloses further include step S8 after step S7:
By rail welding at the unit rail section of the 5th preset length, destressing is carried out to rail and is locked.
In the present embodiment, by taking the 5th preset length is 1000m~2000m as an example.
Rail is welded into the unit rail section of 1000m~2000m by drawing according to design requirement, then according to design
Fastening-down temperature of rail carries out gapless track stress dispersion and locking using drum process or stretcher drum process.Rail welding tolerance
As shown in table 1.
Table 1
| Rail top surface | - 0~+0.2mm/1m |
| Rail head inward facing surface | - 0~+0.2mm/1m |
| Rail bottom (weldering muscle) | 0~+0.5mm/1m |
Further, the invention discloses further include step S9 after step S8: the track that accurate adjustment is laid with, and checks and accepts.
The present invention uses the long rail of push method one-time laying, is first to lay sleeper 1 in advance, lay it is good after with no tiny fragments of stone, coal, etc. rail
Laying operating condition in road is essentially identical, and (artificial channeling direction) is directly pushed using Long rail pushing vehicle or the cooperation of combined tractor is dragged
Drawing mode allows long rail to fall into rail support groove.Its advantages are that applicability, flexibility are stronger, sleeper can store in advance laying, with it is seamless
Route other processes continuous productive process, smaller on duration influence, construction equipment is simple, and civil engineering, which completes one section, can carry out the bottom tiny fragments of stone, coal, etc.
It paves, spread sleeper 1, restricted by civil engineering smaller.
The invention has the following advantages that
1, various Ballast track gapless track constructions are applicable in.
2, cloth pillow can be taken manually or mechanically, and mechanization degree is higher.
3, strong applicability, sleeper can store in advance laying, with gapless track other processes continuous productive process, on the duration influence compared with
Small, construction equipment is simple, can be suitably used for the gapless track construction of various classification of track, strong flexibility.
" first " in the present invention, " second " etc. are to be distinguished in description, without others particular meanings.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be readily apparent to those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, of the invention
It is not intended to be limited to the embodiments shown herein, and is to fit to and principles disclosed herein and inventive features phase
Consistent widest scope.
Claims (10)
1. a kind of Ballast track laying method, which comprises the following steps:
Step A: sleeper is laid with the first preset spacing；
Step B: rail is pushed in the rail support groove of the sleeper.
2. Ballast track laying method according to claim 1, which is characterized in that further include step before the step A
C:
The base of rail to be laid is selected, and arranges III accurate measurement net of CP.
3. Ballast track laying method according to claim 2, which is characterized in that between the step A and the step C
Further include step D:
First of tiny fragments of stone, coal, etc. is laid on the base.
4. Ballast track laying method according to claim 3, which is characterized in that between the step A and the step D
Further include step E:
Store the rail, the sleeper and first railway ballast.
5. Ballast track laying method according to claim 4, which is characterized in that in the step E, the rail storage
In the base, the sleeper is divided into the second default layer stacking along the base by batten, and the bottom of the sleeper
Layer and the base along between be provided with isolation strip, first railway ballast is stored in along the base.
6. Ballast track laying method according to claim 5, which is characterized in that in the step B, the bottom of the rail
End is equipped with rubber mat plate, is placed with roller in the rail support groove, and at a distance of third pre-determined distance between the roller, when the rail
Push in place after, remove the roller, the rail is fallen in the rail support groove, and by snap fit part by the rail with it is described
Sleeper is fixed, and installs the snap fit part every the 4th default snap fit part installation position, is put between the rail gap of the adjacent rail
Rail head is set, and is detachably connected by bolt.
7. Ballast track laying method according to claim 6, which is characterized in that further include step after the step B
F:
Spacing and the angle for adjusting the rail are upright, and will install the snap fit part on remaining snap fit part installation position.
8. Ballast track laying method according to claim 7, which is characterized in that further include step after the step F
G:
The tiny fragments of stone, coal, etc. in layering, so that the railway ballast face of the second railway ballast formed after the upper tiny fragments of stone, coal, etc. is lower than the sleeper surface of the sleeper.
9. Ballast track laying method according to claim 8, which is characterized in that further include step after the step F
H:
By the rail welding at the unit rail section of the 5th preset length, destressing is carried out to the rail and is locked.
10. Ballast track laying method according to claim 9, which is characterized in that further include step after the step H
I:
The track that accurate adjustment is laid with, and check and accept.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810883161.8A CN108951323A (en) | 2018-08-06 | 2018-08-06 | A kind of Ballast track laying method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810883161.8A CN108951323A (en) | 2018-08-06 | 2018-08-06 | A kind of Ballast track laying method |
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| CN108951323A true CN108951323A (en) | 2018-12-07 |
Family
ID=64467510
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810883161.8A Pending CN108951323A (en) | 2018-08-06 | 2018-08-06 | A kind of Ballast track laying method |
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|---|---|---|---|---|
| CN101173492A (en) * | 2007-11-26 | 2008-05-07 | 中铁四局集团有限公司 | Turnout in-situ laying method for ballast track passenger dedicated line |
| CN102002898A (en) * | 2010-12-15 | 2011-04-06 | 株洲长远铁路建机股份有限公司 | Construction method of group-sleeper long rail track-laying unit for laying seamless track ballasted beds |
| US20150144020A1 (en) * | 2012-06-01 | 2015-05-28 | Ferrovial Agroman, S.A. | Pulling machine for unloading and laying railway tracks |
| CN104790271A (en) * | 2015-05-20 | 2015-07-22 | 中铁十五局集团有限公司 | Method for finishing long rail of ballast track before straight laying |
| CN105401495A (en) * | 2015-10-23 | 2016-03-16 | 中铁十七局集团第五工程有限公司 | Method for rapidly and directly paving 100 m long rail of ballast track of newly-built railway |
-
2018
- 2018-08-06 CN CN201810883161.8A patent/CN108951323A/en active Pending
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| CN101173492A (en) * | 2007-11-26 | 2008-05-07 | 中铁四局集团有限公司 | Turnout in-situ laying method for ballast track passenger dedicated line |
| CN102002898A (en) * | 2010-12-15 | 2011-04-06 | 株洲长远铁路建机股份有限公司 | Construction method of group-sleeper long rail track-laying unit for laying seamless track ballasted beds |
| US20150144020A1 (en) * | 2012-06-01 | 2015-05-28 | Ferrovial Agroman, S.A. | Pulling machine for unloading and laying railway tracks |
| CN104790271A (en) * | 2015-05-20 | 2015-07-22 | 中铁十五局集团有限公司 | Method for finishing long rail of ballast track before straight laying |
| CN105401495A (en) * | 2015-10-23 | 2016-03-16 | 中铁十七局集团第五工程有限公司 | Method for rapidly and directly paving 100 m long rail of ballast track of newly-built railway |
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Application publication date: 20181207 |
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