CN103630677B - Experimental device and method for testing grouting speed and filling degree of open joint repairing material - Google Patents
Experimental device and method for testing grouting speed and filling degree of open joint repairing material Download PDFInfo
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- CN103630677B CN103630677B CN201310631200.2A CN201310631200A CN103630677B CN 103630677 B CN103630677 B CN 103630677B CN 201310631200 A CN201310631200 A CN 201310631200A CN 103630677 B CN103630677 B CN 103630677B
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Abstract
The invention discloses an experimental device and a method for testing grouting speed and filling degree of an open joint repairing material. A simulated open joint is constructed; the width of the simulated open joint can be adjusted by only adjusting the thickness of a washer; the physical state in the open joint is simulated through a simulation layer; the most important is that the grouting state can be directly observed through a transparent experimental panel so as to conveniently and directly observe the grouting speed and the filling degree; the selecting speed of the grouting material or the open joint repairing material can be quickened, so that the reference is provided for improving the project quality, saving the working period, avoiding the waste of the repairing material and reducing the repair workload.
Description
Technical field
The present invention relates to a kind of experimental provision testing gap patching material injection speed and fullness degree, and use the experimental technique of this experimental provision.
Background technology
At the realm of building construction, occur between the component that gap refers to cooperation to loosen, cause the phenomenon of separation, usually also the gap that this phenomenon is formed is called gap.
In order to ensure the high ride of high speed railway track state, meet as the security of motor train unit high speed traveling and comfortableness requirement, unified process is carried out to the track plates gap occurred during such as high temperature.Because gap is usually expressed as the gap with certain depth and width, repair grouting speed and fullness degree cannot be checked intuitively in scene, often need to be determined by experiment filling velocity and fullness degree, are beneficial to better repair gap.
As CTRSII type track plates, the phenomenon that itself and CA mortar (i.e. the abbreviation of cement asphalt mortar, cement.asphalt.mortar) produce gap is comparatively general.CRTSII plate-type non-fragment orbit is made up of the part such as rail, spring secures rail to sleeper, precast track plate, CA mortar adjustment layer, continuously bedplate (on bridge)/supporting course (on roadbed), sliding layer (on bridge), side direction block (on bridge).
CRTSII plate-type Construction of Ballastless Track flow process following (so that bridge to be constructed): the vertical → side direction block of connect → laying a railway track of sliding layer → bedplate → guidance tape → track slab precision adjustment of slightly laying a railway track → perfusion CA mortar adjustment layer → track plates.In work progress, after CA mortar injection after about 10 days, track plates and CA mortar adjustment layer start to occur gap phenomenon in various degree, and the gap position overwhelming majority appears at track plates four corners position.
Gap width between high-speed railway track plate and CA screed, substantially within the scope of 0.1 ~ 2.0mm, usually adopts gravity leakage or low pressure machinery grouting mode to be injected by gap patching material in gap thus repairs gap in Practical Project.Prolong track plates Width one end and arrange grouting port, the other end arranges exhausr port, and gap patching material is injected by grouting port, and material to be repaired flows out in exhausr port one end, then stop slip casting, be full of gap depending on patching material.
But as previously mentioned due to the properties of distributions of gap, in Practical Project, patching material comparatively at gap is filled leakiness and can be formed bubble in depths, occurs the hollowing phenomenon between track plates and CA screed, reduces patching material fullness degree; The flowing velocity of patching material in gap is by matrix material and matrix gap effect of depth, therefore different directions injection speed slightly deviation, and namely exhausr port pulp is thought may cause matrix material edge gap to repair not thorough by the full all gaps of patching material; In pressure unstability situation may there is adverse current in patching material simultaneously, matrix edge gap also can be caused to repair not thorough; Above phenomenon all can cause potential safety hazard, increases and reprocesses difficulty and workload.Further, in construction work because the opaque of matrix causes above-mentioned phenomenon to observe.
Summary of the invention
The invention provides a kind of experimental provision intuitively, dynamically can observing gap patching material slip casting situation in gap, and use the test method of this test unit, the gap patching material that injection speed is fast so as to optimizing fast, fullness degree is high, so for improving construction quality, save the duration, avoid the waste of patching material, reduce reclamation work amount reference is provided.
The present invention is by the following technical solutions:
According to one aspect of the present invention, a kind of experimental provision testing gap patching material injection speed and fullness degree, comprising:
Experiment base plate is rectangular parallelepiped block;
Simulation layer, is engaged in the upper surface of experiment base plate, for simulating organic material layer;
Test panel is transparent pane shape plate, and plate face size is identical with the upper surface of experiment base plate;
Pad, is supported between experiment base plate and test panel, thus is formed and simulate gap between experiment base plate and test panel;
Sealed-off layer, is coated on experiment base plate and test panel docking site periphery, makes gap and external isolation and forms insulating space; And
Grouting port and exhausr port, coupling simulation gap and select position at insulating space and offer.
Above-mentioned experimental provision, also comprises the device loaded test panel, loading in test panel, floating for preventing test panel.
Above-mentioned experimental provision, described charger comprises:
Support, have the body that a length is greater than experiment base plate, test panel and spacer thickness sum, and be vertically connected at each overhang at body two ends, the overhanging direction of two overhang is identical;
Holding function parts, are arranged in an overhang, and the force direction doing component of these holding function parts perpendicular to test panel plate face and act on this plate face; And
Support portion, is arranged in another overhang, and the support end of this support portion acts on the bottom surface of experiment base plate.
Above-mentioned experimental provision, described holding function parts be axis being parallel in the tight fixed bolt of support, correspondingly, have corresponding threaded hole with the overhang that this tight fixed bolt connects.
Above-mentioned experimental provision, the termination of described tight fixed bolt is provided with flat shim.
Above-mentioned experimental provision, described charger is configured with multiple, and is arranged symmetrically with about the rotational symmetry layout of the vertical axis of this assembly or the face of the vertical plane of symmetry on the assembly of experiment base plate, pad and test panel formation.
Above-mentioned experimental provision, to test the long limit of base plate for reference, long side direction has described grouting port, the other end has exhausr port, and the ratio of the quantity of exhausr port and grouting port is more than or equal to 1 and is less than or equal to 8.
Above-mentioned experimental provision, when grouting port is more than one, grouting port spacing is greater than 100mm; Exhaust space is apart from being then less than or equal to 1000mm.
Above-mentioned experimental provision, described experiment pad is rigid gasket.
Above-mentioned experimental provision, described experiment base plate is selected from concrete slab, plank or plastic plate.
According to another aspect of the present invention, a kind of experimental technique testing gap patching material injection speed and fullness degree, brush waterproof material at the upper surface of the experiment base plate of a cuboid, form scraggly simulation layer;
And then pad is set on the upper surface with simulation layer, the transparent test panel that then decorating plate face is identical with experiment plate upper surface on pad, thus form the simulation gap retrained by spacer thickness between experiment base plate and test panel;
Isolation simulation gap and space outerpace;
By preset or the grouting port of follow-up setting annotate the patching material slurries prepared, and observe exhausr port that is that preset or follow-up setting and whether have patching material slurries to flow out, so as to judging whether termination slip casting;
Patching material slurries are observed at the injection speed of simulating in gap and fullness degree by transparent test panel in slip casting process; And at the end of slip casting, observe overall fullness degree.
Above-mentioned experimental technique, described simulation layer is brushed by rotary broom and is formed, and selects rotary broom model according to roughness in simulated gap.
Above-mentioned experimental technique, the method for isolation simulation gap and space outerpace is, the surrounding of coupling simulation gap, the experiment base plate corresponding by water-proof bond material bonding and the edge of test panel.
Above-mentioned experimental technique, the measuring method of injection speed is: through transparent test panel observation slip casting situation, the record slip casting time is t
ntime patching material slip casting distance l
n, l
n/ t
nbe the injection speed of patching material in gap, t
nthe slip casting distance l in moment
nget the average apart from the longest and the shortest slip casting distance in limit, grouting port place on slip casting direction;
After the simulation gap that gap patching material is all full of between experiment base plate and test panel, use agent to rapidly block up leakage shutoff exhausr port, record slip casting end time t simultaneously
m, t
mbe the TPER of patching material;
And the measuring method of fullness degree is: after slip casting terminates, the number of bubbles of direct observation experiment lower panels and bubble two-dimensional projection area S
1, test panel area S
0be that patching material fills area S with the difference of bubble area
2, then S
1/ S
0for the hollowing rate of patching material, S
2/ S
0for patching material fullness degree.
According to the present invention, as can be seen from such scheme, constructing analog gap, only need the thickness adjusting pad just can adjust the width of simulated gap, and by the physical state in simulation layer simulation gap, the more important thing is, the state of slip casting can be observed intuitively by transparent test panel, thus the convenient speed to slip casting and fullness degree are directly observed, can improve injecting paste material in other words the speed selected of gap patching material so that for improving construction quality, save the duration, avoid the waste of patching material, reduce reclamation work amount reference is provided.
Accompanying drawing explanation
Fig. 1 tests base plate overlook view according to a kind of test in the experimental provision of gap patching material injection speed and fullness degree of the present invention after having superposed pad.
Fig. 2 is a kind of side structure schematic diagram testing the experimental provision of gap patching material injection speed and fullness degree.
In figure: 1. pad, 2. grouting port, 3. exhausr port, 4. tight fixed bolt, 5. geometrical clamp, 6. test panel, 7. simulate gap, 8. feet, 9. support, 10. test panel.
Embodiment
A kind of experimental provision testing gap patching material injection speed and fullness degree as illustrated in fig. 1 and 2, its basic structure comprises:
Experiment base plate 10 is rectangular parallelepiped block;
Simulation layer, is engaged in the upper surface of experiment base plate 10, for simulating organic material layer;
Test panel 6 is transparent pane shape plate, and plate face size is identical with the upper surface of experiment base plate 10;
Pad 1, is supported between experiment base plate 10 and test panel 6, thus is formed and simulate gap 7 between experiment base plate 10 and test panel 6;
Sealed-off layer, is coated on experiment base plate and test panel docking site periphery, makes gap and external isolation and forms insulating space; And
Grouting port 2 and exhausr port 3, coupling simulation gap 7 and select position at insulating space and offer.
Should be appreciated that rectangular parallelepiped block is expressed as a kind of macrostructure, it can not affect those skilled in the art understands the macroscopic view of its structure as having groove or other structures, and this is also the general general knowledge of physical construction description.
Experiment base plate 10 is supporting construction, and thickness need ensure integrally-built rigidity, can select according to material and dimensions.
Test panel 6 needs to possess enough rigidity equally, can be expressed as rigid member, to ensure that simulation gap 7 has relatively uniform height.
For reducing the impact of gravity, form fulcrum by the arrangement of pad 1, to this, the easy reasoning of those skilled in the art is mated according to the arrangement of rigidity with pad 1.To this, have and do not repeat them here about the quantity of pad and arrangement form, those skilled in the art does not easily need to pay creative work according to this record can obtain suitable pad 1 quantity and arrangement form.
Fig. 1 Intermediate gasket 1 is the structure of the periphery arrangement along experiment base plate 10, but known based on above-mentioned design, and its arrangement form is obviously not limited to the structure shown in Fig. 1, is convenient to be distributed be beneficial to and reduces pad itself to the impact of injection speed.But should be appreciated that its impact is all identical to all injecting paste materials, therefore, it is also feasible that pad is distributed in centre simultaneously.
It is to be further understood that the homogeny owing to affecting injecting paste material, so about the material of such as simulation layer, except total attribute, as outside water proofing property, to different injecting paste material also without substantial influence.Therefore, the material of simulation layer is selected relatively loose.
About sealed-off layer, be interpreted as isolation, but various isolation needs to operate in the experimental phase, carry out sealed-off when preparing experiment equipment in other words, sealed-off meets antiseepage.
Further understanding, the use of grouting device can be mated gap and repaired the grouting device used, simultaneously can the shape of adaptive grouting port 2.Another aspect, grouting port 2 can be selected according to grouting device.
Grouting device as the component part of experimental provision, also can be understood as slave part, is the experimental provision of some experiment as beaker, it is not the unique experimental provision of this experiment, but can be referred to as the experimental provision of this experiment, to this, the public should understand.
In certain embodiments, in order to reduce the impact of buoyancy, also comprising the device that test panel 6 is loaded, loading in test panel 6, floating for preventing test panel to be subject to the buoyancy of slip casting.
Charger can be directly pressing plate or briquetting in certain embodiments, is pressed in the edge of test panel 6, also can not affect the observation to experiment process.
Charger can be a frame body, and as being the rectangle frame at Matching Experiment panel 6 edge, coupling weight, can use plumbous matter framework, not high for weight demands, can adopt as aluminum alloy frame.General selection is the framework of iron and steel matter.
In certain embodiments, in order to more convenient operation, described charger comprises:
Support 9, have the body that a length is greater than experiment base plate 10, test panel 6 and pad 1 thickness sum, and be vertically connected at each overhang at body two ends, the overhanging direction of two overhang is identical;
Holding function parts, are arranged in an overhang, and the force direction doing component of these holding function parts perpendicular to test panel plate face and act on this plate face; And
Support portion, is arranged in another overhang, and the support end of this support portion acts on the bottom surface of experiment base plate.
Body can be bar part, can also be the bar part with additional structure, and it remains the two power bars that mechanically can simplify in essence.
After adding overhang, one-piece construction is similar to clip, produces holding force, so as to producing the normal pressure to test panel 6.
Holding function parts mainly produce the parts of holding force, and those skilled in the art is easy understand accordingly, and it is driving link, and it does partly, and directly acting on test panel 6 produces required normal pressure.
Holding function parts can adopt self-holding mode, as spring driven fore-set.This structure is simple, can carry out clamping fast by fore-set in groove.But defect is it has fixing stiffness factor, holding force is directly proportional with decrement, bad adjustment holding force.
In certain embodiments, described holding function parts be axis being parallel in the tight fixed bolt 4 of support, correspondingly, the overhang connected with this tight fixed bolt 4 has corresponding threaded hole, this structure statement of account, cost is low, and the holding force required for can being produced by adjustment ingot bolt 4 pretightning force.But operate and want more loaded down with trivial details compared to spring structure.
As shown in Figure 2, the termination of described tight fixed bolt 4 is provided with flat shim, reduces the damage to test panel, flat shim can with tight fixed bolt one, also can be Split type structure, tight fixed bolt can also be connected to by revolute pair, be convenient for carrying.
In the structure shown in Fig. 2, another overhang is also provided with the binding site of experiment base plate 10 feet 8 increasing bonded area, and feet 8 also can adopt flat shim.
In order to symmetrical load, described charger is configured with multiple, and is arranged symmetrically with about the rotational symmetry layout of the vertical axis of this assembly or the face of the vertical plane of symmetry on the assembly of experiment base plate, pad and test panel formation.
To test the long limit of base plate 10 for reference, the one end on long side direction has described grouting port 2, and the other end has exhausr port 3, and the ratio of the quantity of exhausr port 3 and grouting port 2 is more than or equal to 2 and is less than or equal to 8.
Because gas flow rates will far above liquid, therefore, the quantity of exhausr port can be relatively less, and the configuration quantity of general employing and grouting port 1:1, at most can not more than 8:1, and usual vent port is The more the better, but too much also can affect final shutoff speed.
When grouting port is more than one, grouting port spacing is greater than 100mm; Exhausr port spacing is then less than or equal to 1000mm.
Preferably, described experiment pad is rigid gasket, to ensure the accurate setting of simulating gap 7.
Further, described experiment base plate is selected from concrete slab, plank or plastic plate.
According to said structure, a kind of experimental technique testing gap patching material injection speed and fullness degree, brush waterproof material at the upper surface of the experiment base plate 10 of a cuboid, form scraggly simulation layer; As described in experiment base plate 10 upper surface rotary broom should be used to apply organic waterproof material, avoid repairing the seepage of slurry in experiment base plate, simulate organic material surface nature and the rough character of surface of aging CA mortar of CA mortar simultaneously, after waterproof material drying, lay pad.
And then pad is set on the upper surface with simulation layer, the transparent test panel that then decorating plate face is identical with experiment plate upper surface on pad, thus form the simulation gap retrained by spacer thickness between experiment base plate and test panel.
Isolation simulation gap and space outerpace; As described in experiment base plate and test panel surrounding bondd by waterproof consolidating material, the surrounding except grouting port and exhausr port must bond closely knit, prevents gap patching material from test base plate and test panel junction, seepage occurring.
By preset or the grouting port of follow-up setting annotate the patching material slurries prepared, and observe exhausr port that is that preset or follow-up setting and whether have patching material slurries to flow out, so as to judging whether termination slip casting.
Patching material slurries are observed at the injection speed of simulating in gap and fullness degree by transparent test panel in slip casting process; And at the end of slip casting, observe overall fullness degree.
As can be seen from such scheme, slip casting process can be observed intuitively by transparent test panel, conveniently carry out the statistics of injection speed, and the observation of final fullness degree and calculating.
Described simulation layer is brushed by rotary broom and is formed, and according to roughness selection rotary broom model in simulate gap, and can go out the simulation gap of required roughness by straight forming, efficiency is also higher.
The method of isolation simulation gap and space outerpace is, the surrounding of coupling simulation gap, the experiment base plate corresponding by water-proof bond material bonding and the edge of test panel.
Through transparent test panel observation slip casting situation, patching material slip casting distance ln when the record slip casting time is tn, ln/tn is the injection speed of patching material in gap, and the slip casting distance ln in tn moment gets the average apart from the longest and the shortest slip casting distance in limit, grouting port place on slip casting direction;
After the simulation gap that gap patching material is all full of between experiment base plate and test panel, use agent to rapidly block up leakage shutoff exhausr port, record slip casting end time tm, tm is the TPER of patching material simultaneously;
And the measuring method of fullness degree is: after slip casting terminates, the number of bubbles of direct observation experiment lower panels and bubble two-dimensional projection area S1, the difference of test panel area S0 and bubble area is that patching material fills area S2, then S
1/ S
0for the hollowing rate of patching material, S2/ S0 is patching material fullness degree.
About experimental technique, a specific embodiment:
(1) 1.2*4m is selected
2experimental provision and gravity leakage grouting device the injection speed of the low viscosity epoxy resin that CNBM Zhongyan Technology Co., Ltd. produces and fullness degree are tested, bury the grouting port 1 that internal diameter is 2mm underground in middle part, 1.2m limit, another relative 1.2m limit is uniformly distributed the vent port of 5 internal diameter 2mm;
(2) low viscosity epoxy resin AB component is prepared burden according to 4:1, mix;
(3) low viscosity epoxy resin mixed is injected grouting device material storage tube, treat to observe that grouting port resin flows out through test panel, press the stopwatch record slip casting start time simultaneously;
(4) through transparent test panel observation slip casting situation, record moment t
nwith patching material at t
nthe slip casting distance l in moment
n, l
n/ t
nbe the injection speed of patching material in gap, the injection speed of low viscosity epoxy resin is about 1.6m/h;
(5), after gap patching material is all full of the gap between experiment base plate and test panel, use agent to rapidly block up leakage shutoff vent port, record slip casting end time tm, low viscosity epoxy resin is the experimental provision of 4m for length, and its TPER is 2.5h simultaneously;
(6), after slip casting terminates, the number of bubbles directly below observation test panel is 8 and bubble two-dimensional projection area S
1for 168mm
2, then low viscosity epoxy resin hollowing rate is 0.35
0/
000, fullness degree is 9999.65
0/
000.
(7) low viscosity epoxy resin injection speed can reach 1.6m/h, and fullness degree is 9999.65
0/
000, be desirable gap patching material.
PMC composite water-proof paint (also known as elastic cement) extremely synthesizes macromolecule emulsion for base-material with acrylic acid, add the bi-component water-proof class coating material that special cement, inorganic solidification agent and multiple auxiliary agent are formulated, it has good film forming, impermeability, cohesiveness (having very strong cohesiveness with concrete, brick, stone material, ceramic tile, PVC plastic, steel, timber, glass etc.), water tolerance and weatherability, film-forming of particularly can constructing on wet base.
Claims (12)
1. test an experimental provision for gap patching material injection speed and fullness degree, it is characterized in that, comprising:
Experiment base plate (10) is rectangular parallelepiped block;
Simulation layer, is engaged in the upper surface of experiment base plate (10), for simulating organic material layer;
Test panel (6) is transparent pane shape plate, and plate face size is identical with the upper surface of experiment base plate (10);
Pad (1), is supported between experiment base plate (10) with test panel (6), thus is formed and simulate gap (7) testing between base plate (10) and test panel (6);
Sealed-off layer, is coated on experiment base plate and test panel docking site periphery, makes gap and external isolation and forms insulating space; And
Grouting port (2) and exhausr port (3), coupling simulation gap (7) and select position at insulating space and offer;
Also comprise the device that test panel (6) is loaded, loading in test panel (6), floating for preventing test panel;
Wherein, described charger comprises:
Support (9), have a length and be greater than the body of testing base plate (10), test panel (6) and spacer thickness sum, and be vertically connected at each overhang at body two ends, the overhanging direction of two overhang is identical;
Holding function parts, are arranged in an overhang, and the force direction doing component of these holding function parts perpendicular to test panel plate face and act on this plate face; And
Support portion, is arranged in another overhang, and the support end of this support portion acts on the bottom surface of experiment base plate.
2. experimental provision according to claim 1, is characterized in that, described holding function parts be axis being parallel in the tight fixed bolt of support, correspondingly, have corresponding threaded hole with the overhang that this tight fixed bolt connects.
3. experimental provision according to claim 2, is characterized in that, the termination of described tight fixed bolt is provided with flat shim.
4. according to the arbitrary described experimental provision of claims 1 to 3, it is characterized in that, described charger is configured with multiple, and is arranged symmetrically with about the rotational symmetry layout of the vertical axis of this assembly or the face of the vertical plane of symmetry on the assembly of experiment base plate, pad and test panel formation.
5. experimental provision according to claim 1, it is characterized in that, to test the long limit of base plate (10) for reference, one end on long side direction has described grouting port (2), the other end has exhausr port (3), and the ratio of the quantity of exhausr port (3) and grouting port (2) is more than or equal to 1 and is less than or equal to 8.
6. experimental provision according to claim 5, is characterized in that, when grouting port is more than one, grouting port spacing is greater than 100mm; Exhausr port spacing is then less than or equal to 1000mm.
7. experimental provision according to claim 1, is characterized in that, described experiment pad is rigid gasket.
8. the experimental provision according to claim 1 or 7, is characterized in that, described experiment base plate is selected from concrete slab, plank or plastic plate.
9. test an experimental technique for gap patching material injection speed and fullness degree, it is characterized in that, brush waterproof material at the upper surface of the experiment base plate of a cuboid, form scraggly simulation layer;
And then pad is set on the upper surface with simulation layer, the transparent test panel that then decorating plate face is identical with experiment plate upper surface on pad, thus form the simulation gap retrained by spacer thickness between experiment base plate and test panel;
Isolation simulation gap and space outerpace;
By preset or the grouting port of follow-up setting annotate the patching material slurries prepared, and observe exhausr port that is that preset or follow-up setting and whether have patching material slurries to flow out, so as to judging whether termination slip casting;
Patching material slurries are observed at the injection speed of simulating in gap and fullness degree by transparent test panel in slip casting process; And at the end of slip casting, observe overall fullness degree.
10. experimental technique according to claim 9, is characterized in that, described simulation layer is brushed by rotary broom and formed, and selects rotary broom model according to roughness in simulated gap.
11. experimental techniques according to claim 9 or 10, is characterized in that, isolation simulation gap with the method for space outerpace is, the surrounding of coupling simulation gap, by the experiment base plate of water-proof bond material bonding correspondence and the edge of test panel.
12. experimental techniques according to claim 9, is characterized in that, the measuring method of injection speed is: through transparent test panel observation slip casting situation, the record slip casting time is t
ntime patching material slip casting distance l
n, l
n/ t
nbe the injection speed of patching material in gap, t
nthe slip casting distance l in moment
nget the average apart from the longest and the shortest slip casting distance in limit, grouting port place on slip casting direction;
After the simulation gap that gap patching material is all full of between experiment base plate and test panel, use agent to rapidly block up leakage shutoff exhausr port, record slip casting end time t simultaneously
m, t
mbe the TPER of patching material;
And the measuring method of fullness degree is: after slip casting terminates, the number of bubbles of direct observation experiment lower panels and bubble two-dimensional projection area S
1, test panel area S
0be that patching material fills area S with the difference of bubble area
2, then S
1/ S
0for the hollowing rate of patching material, S
2/ S
0for patching material fullness degree.
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| CN111307545A (en) * | 2020-02-21 | 2020-06-19 | 中铁第四勘察设计院集团有限公司 | Experimental method for simulating track interlayer gap diseases |
| CN112270883B (en) * | 2020-11-05 | 2022-06-24 | 上海市建筑科学研究院有限公司 | Simulation test device for representing filling property of grouting material |
| CN114575196A (en) * | 2022-03-15 | 2022-06-03 | 湖北木之君工程材料有限公司 | Sleeper void-eliminating construction method for long-sleeper embedded type ballastless track |
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