CN115262292A - Structure and construction method for preventing slurry pumping of ballastless track roadbed contact layer - Google Patents
Structure and construction method for preventing slurry pumping of ballastless track roadbed contact layer Download PDFInfo
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- CN115262292A CN115262292A CN202210994846.6A CN202210994846A CN115262292A CN 115262292 A CN115262292 A CN 115262292A CN 202210994846 A CN202210994846 A CN 202210994846A CN 115262292 A CN115262292 A CN 115262292A
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- 238000005086 pumping Methods 0.000 title claims abstract description 32
- 239000002002 slurry Substances 0.000 title claims abstract description 28
- 238000010276 construction Methods 0.000 title claims abstract description 12
- 239000002344 surface layer Substances 0.000 claims abstract description 66
- 239000010410 layer Substances 0.000 claims abstract description 59
- 238000001914 filtration Methods 0.000 claims abstract description 45
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 11
- 239000004567 concrete Substances 0.000 claims description 18
- 239000004746 geotextile Substances 0.000 claims description 11
- 238000005056 compaction Methods 0.000 claims description 6
- 239000004575 stone Substances 0.000 claims description 6
- 229910000831 Steel Inorganic materials 0.000 claims description 5
- 239000010959 steel Substances 0.000 claims description 5
- 230000002265 prevention Effects 0.000 claims description 4
- 239000004570 mortar (masonry) Substances 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 238000013461 design Methods 0.000 claims description 2
- 230000000740 bleeding effect Effects 0.000 claims 1
- 239000011440 grout Substances 0.000 claims 1
- 239000008187 granular material Substances 0.000 abstract description 4
- 238000010008 shearing Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 29
- 238000007789 sealing Methods 0.000 description 8
- 230000009286 beneficial effect Effects 0.000 description 6
- 201000010099 disease Diseases 0.000 description 5
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 description 5
- 238000010586 diagram Methods 0.000 description 4
- 239000011380 pervious concrete Substances 0.000 description 4
- 239000002689 soil Substances 0.000 description 4
- 230000009471 action Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 230000005012 migration Effects 0.000 description 3
- 238000013508 migration Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 239000012466 permeate Substances 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000011398 Portland cement Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
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- 239000011376 self-consolidating concrete Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
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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
- E01B1/008—Drainage of track
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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
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/07—Drainage
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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
- E01B2204/00—Characteristics of the track and its foundations
- E01B2204/09—Ballastless systems
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
Abstract
The invention discloses a structure and a construction method for preventing slurry pumping of a ballastless track subgrade contact layer, wherein the structure comprises the following steps: the drainage reinforcing system and the inverse filtering system are arranged in a surface layer of a foundation bed of the ballastless track subgrade; the drainage reinforcing system comprises a plurality of drainage column units arranged at intervals, drainage pieces arranged at the bottoms of the drainage column units and blind ditches symmetrically arranged at the two sides of the surface layer of the foundation bed respectively, the reverse filtering system is arranged at the top of the surface layer of the foundation bed and is in contact with the top ends of the drainage column units, the drainage piece is positioned between the surface layer of the foundation bed and the bottom layer of the foundation bed and is arched at the middle part, and two ends of the drainage piece extend to two sides of the surface layer of the foundation bed. The drainage piece and the reverse filtering system can effectively prevent fine aggregate in the foundation bed from flowing outwards, and meanwhile, the drainage column unit and the drainage piece can play a certain reinforcing role in the surface layer of the foundation bed, increase the shearing resistance of granular materials and further solve the problem of slurry turning and mud pumping from the source.
Description
Technical Field
The invention relates to the technical field of ballastless track roadbed disease control, in particular to a structure and a construction method for preventing ballastless track roadbed contact layer from slurry turning and mud pumping.
Background
The description of the background of the invention pertaining to the related art to which this invention pertains is given for the purpose of illustration and understanding only of the summary of the invention and is not to be construed as an admission that the applicant is explicitly or implicitly admitted to be prior art to the date of filing this application as first filed with this invention.
The basic conditions of slurry pumping on the surface layer of the ballastless track subgrade bed are that the load of a train, the infiltration and the retention of rainwater and the migration of fine particles are the basic conditions of slurry pumping on the surface layer of the ballastless track subgrade bed, and a large number of field tests and indoor model experiments find that the essence of the slurry pumping on the ballastless track subgrade bed is slurry formed by fine aggregate in graded broken stones on the surface layer of the subgrade bed along with the outflow of accumulated water under the action of excess pore water pressure. With the further development of the mud pumping disease, the content of fine aggregate in the surface layer of the foundation bed is increased, and the fine aggregate continuously migrates to the external environment through gaps, the gradation of the foundation bed is greatly changed, the interaction area among the aggregate groups is reduced, the whole bearing capacity of the foundation bed is reduced, and under the action of the circulating load of the train, the gap between the surface layer of the foundation bed and the base plate gradually develops into a cavity, thereby seriously threatening the driving safety of the high-speed train.
At present, the gaps of the sealing layer and the expansion joints of the base plate are subjected to sealing and waterproof treatment by adopting a high molecular organic material, but in the subsequent driving process, the sealing part is easy to be cracked again, and the slurry is turned and the mud is blown out. Therefore, the method needs to start with the two aspects of water prevention and drainage and fine aggregate migration prevention, timely discharges water infiltrated into the shallow layer of the contact layer, prevents the migration of the fine aggregate in the graded broken stone, develops a new structure of the roadbed contact layer with drainage, reinforcement and reverse filtration functions, and avoids the occurrence of slurry turning and mud pumping from the source.
Disclosure of Invention
The invention aims to provide a structure and a construction method for preventing slurry pumping of a ballastless track subgrade contact layer, and aims to solve the problems that the existing ballastless track is poor in drainage capability and cannot effectively prevent fine aggregate from migrating, so that slurry pumping cannot be solved from the source.
The technical scheme for solving the technical problems is as follows:
the utility model provides a structure that prevention ballastless track road bed contact bed mud pumping, includes: bed meter arranged on ballastless track roadbed a drainage reinforcement system and a reverse filtration system in the layer;
the drainage reinforcing system comprises a plurality of drainage column units arranged at intervals, drainage pieces arranged at the bottoms of the drainage column units and blind ditches symmetrically arranged at the two sides of the surface layer of the foundation bed respectively, the reverse filtering system is arranged at the top of the surface layer of the foundation bed and is in contact with the top ends of the drainage column units, the drainage piece is positioned between the surface layer of the foundation bed and the bottom layer of the foundation bed and is arched at the middle part, and two ends of the drainage piece extend to two sides of the surface layer of the foundation bed.
The beneficial effects of adopting the above technical scheme are: the water gap enters the drainage column unit through the back filtering system at the top of the surface layer of the foundation bed, part of water in the drainage column unit enters the surface layer of the foundation bed, and the water in the surface layer of the foundation bed is drained out of the foundation bed through the blind ditch by virtue of the drainage capacity of the surface layer of the foundation bed; and the other part of water enters the drainage and flow guide piece and is discharged out of the surface layer of the foundation bed through the drainage and flow guide piece. Drainage piece and anti-system of straining can effectively prevent the outflow of fine aggregate in the foundation bed, and drainage post unit, drainage piece can play certain reinforcing effect to the foundation bed top layer simultaneously, increase the shear resistance of granular material to solve the problem of mud pumping from the source.
Furthermore, the drainage column unit comprises a permeable concrete column and a reverse filtering geotextile wrapped on the outer wall of the permeable concrete column, the top of the permeable concrete column is in contact with the bottom of the reverse filtering system, and the bottom of the permeable concrete column is connected with the top of the drainage piece.
Further, the middle part of the reverse filtering system is arched upwards.
Furthermore, both ends of the reverse filtering system and both ends of the drainage member are arranged according to the gradient of 4-5%.
The beneficial effects of adopting the above technical scheme are: through set up certain slope with anti-system and the drainage piece of straining, when water gets into, the slope can carry out the water conservancy diversion to water.
Further, drainage piece is including the anti-piece of straining, three-dimensional geotechnological net core and the anti-piece of straining of water proof that sets gradually from top to bottom, and anti-piece of straining contacts with the bottom of concrete column that permeates water.
The beneficial effects of adopting the above technical scheme are: the drainage and drainage piece is designed by three layers, so that the outflow of fine aggregate in the surface layer of the foundation bed can be effectively prevented.
Furthermore, the blind ditch includes the support component that permeates water and wraps up the non-woven geotechnological cloth in the support component outside, and the support component that permeates water is the right trapezoid structure.
The beneficial effects of adopting the above technical scheme are: the permeable supporting component can support the surface layer of the foundation bed to a certain degree, so that the stability of the surface layer of the foundation bed is increased, and the integral bearing capacity of the foundation bed is improved.
The invention also provides a construction method for preventing slurry pumping of the ballastless track subgrade contact layer, which comprises the following steps:
s1: filling the bottom layer of the foundation bed according to the designed elevation of the bottom layer of the foundation bed, performing layered compaction, and filling the middle part of the top end of the bottom layer of the foundation bed to form an arch structure;
s2: paving a drainage piece on the top of the bottom layer of the foundation bed, measuring and dividing the positions of the drainage column units, and fixing the drainage column units on the top of the drainage piece according to the divided positions of the drainage column units;
s3: filling blind ditches below a cable duct of the ballastless track and at the position symmetrical to the center of the line, filling graded broken stones at the rest positions of the surface layer of the foundation bed, and performing layering compaction;
s4: laying a reverse filtration system on the top of the surface layer of the foundation bed, and fixing the reverse filtration system on the top of the drainage column unit;
s5: and pouring a sealing layer at the top of the reverse filtering system, and laying a base plate, a track plate and a steel rail at the same time.
The beneficial effects of adopting the above technical scheme are: the drainage fixing system and the reverse filtering system are sequentially laid according to the certain steps, external rainfall and environmental water seeping into the surface layer of the foundation bed can be timely collected and quickly discharged, the occurrence of slurry pumping of the foundation bed of the roadbed is fundamentally blocked, slurry pumping diseases of a contact layer of the ballastless track roadbed can be effectively prevented, and the method is suitable for construction of the ballastless track and can also be used for protection of slurry pumping diseases of the ballastless track which is constructed at present.
Further, in the step S2, in the laying manner of the drainage column units, along the longitudinal direction of the line, the arrangement distance of the drainage column units is 0.8m to 1m within the range of the expansion joint of the base plate of the ballastless track and the front and back 1m thereof, and the arrangement distance of the drainage column units is 1.2m to 1.5m outside the range of the expansion joint of the base plate and the front and back 1m thereof.
Furthermore, the middle part of the reverse filtering system is arched upwards, and the two ends of the reverse filtering system and the two ends of the drainage piece are both arranged according to the gradient of 4% -5%.
Furthermore, the drainage and drainage piece is laid at the bottom of the surface layer of the foundation bed, and the reverse filtration system is laid at the top of the surface layer of the foundation bed along the full length of the line.
Compared with the prior art, the invention has the following beneficial effects:
1. according to the invention, through the drainage column unit, the drainage piece and the blind ditch, external rainfall and environmental water seeping into the surface layer of the foundation bed are collected in time and quickly discharged, the occurrence of slurry pumping of the foundation bed of the roadbed is blocked fundamentally, and slurry pumping diseases of a contact layer of the ballastless track roadbed can be effectively prevented;
2. according to the invention, the reverse filtering system and the drainage and drainage member are laid on the surface layer of the ballastless track foundation bed, so that the outflow of fine aggregate in graded broken stone can be effectively prevented, the complete contact characteristic of the foundation bed surface layer and the bed plate is kept, the function of reinforcing the foundation bed surface layer is taken into consideration, the shear resistance of the granular material is enhanced, the integral bearing capacity of the foundation bed is improved, and the uneven settlement and deformation of the roadbed can be effectively relieved.
Drawings
Fig. 1 is a schematic cross-sectional structure diagram of a track structure and a roadbed of an upper portion of a current ballastless track;
FIG. 2 is a schematic cross-sectional structure diagram of a structure for preventing slurry pumping of a ballastless track subgrade contact layer;
FIG. 3 shows a drainage guide schematic structural diagram of (a);
FIG. 4 is a schematic structural view of a drainage column unit;
FIG. 5 is a drainage column unit schematic diagram of the layout structure of (1).
In the figure: 1-steel rail, 2-rail plate, 3-base plate, 4-sealing layer, 5-bed surface layer, 6-bed bottom layer, 7-drainage column unit, 71-permeable concrete column, 72-reversed filter geotextile, 8-drainage piece, 81-reversed filter piece, 82-three-dimensional geotechnical net core, 83-waterproof reversed filter piece, 9-blind ditch, 91-permeable support component and 10-reversed filter system.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive effort based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, in the existing track structure and roadbed structure on the ballastless track of the high-speed railway, a bed surface layer 5 is laid on a bed bottom layer 6, then a bed plate 3 is laid on the bed surface layer 5, a track plate 2 is laid on the bed plate 3, and a steel rail 1 is laid on the track plate 2;
the bed surface layer 5 is covered with a sealing layer 4, and the sealing layer 4 extends to the edge of the base plate 3. A CA mortar layer or self-compacting concrete is paved between the base plate 3 and the track plate 2 on part of the ballastless track.
The invention provides a structure for preventing slurry pumping of a ballastless track subgrade contact layer, as shown in fig. 2 to 5, comprising: the drainage reinforcing system and the inverse filtering system 10 are arranged in the surface layer 5 of the foundation bed of the ballastless track subgrade;
the drainage reinforcing system comprises a plurality of drainage column units 7 arranged at intervals, drainage pieces 8 arranged at the bottoms of the drainage column units 7 and blind ditches 9 respectively and symmetrically arranged at two sides of the surface layer 5 of the foundation bed, the reverse filtering system 10 is arranged at the top of the foundation bed surface layer 5 and is in contact with the top ends of the plurality of drainage column units 7, the drainage piece 8 is positioned between the foundation bed surface layer 5 and the foundation bed bottom layer 6, the middle part of the drainage piece is arched upwards, and two ends of the drainage piece 8 extend towards two sides of the foundation bed surface layer 5. The middle part of drainage piece 8 is upwarped, and its both ends extend to the both sides of basic unit top layer 5, are convenient for water guide, and can also effectively prevent the outflow of fine aggregate in basic unit top layer 5. The drainage column unit 7 is used for reinforcing the surface layer 5 of the foundation bed, increasing the shearing resistance of the granular material, improving the integral bearing capacity of the foundation bed and effectively relieving the uneven settlement and deformation of the roadbed. The reverse filtration system 10 in this embodiment uses a reverse filtration geotextile, and other water permeable reverse filtration materials can be used in other embodiments of the present invention.
The drainage column unit 7 comprises a permeable concrete column 71 and a reverse filtering geotextile 72 wrapped on the outer wall of the permeable concrete column 71, the top of the permeable concrete column 71 is contacted with the bottom of the reverse filtering system 10, and the bottom of the permeable concrete column 71 is connected with the top of the drainage guide member 8. The pervious concrete column 71 can support and reinforce the surface layer 5 of the foundation bed, can avoid the loss of soil particles in the drainage column unit 7 under the action of the reverse filtering geotextile 72, and can achieve the drainage effect. The pervious concrete column 71 is prefabricated in a factory, wherein the cement is 42.5-grade ordinary portland cement, the water cement ratio is 0.3, the aggregate particle size is 2.5mm-6mm, the overall height of the pervious concrete column 71 is 0.7m, and the radius of the pervious concrete column is 0.2 m.
In order to facilitate the diversion of the water entering the surface layer 5 of the foundation bed, the middle part of the reverse filtering system 10 is arched upwards. Both ends of the reverse filtering system 10 and both ends of the drainage member 8 are arranged according to 4% -5% of gradient.
The drainage and drainage member 8 comprises an anti-filter member 81, a three-dimensional geonet core 82 and a water-resisting anti-filter member 83 which are sequentially arranged from top to bottom, and the anti-filter member 81 is in contact with the bottom of the permeable concrete column 71. The reverse filtering piece 81 adopts the existing short fiber needle-punched non-woven geotextile, has good air permeability and water permeability, can effectively intercept sandy soil loss, effectively diffuse, transmit or decompose concentrated stress, and prevent soil from being damaged by external force; the three-dimensional geonet core 82 has a soil-fixing effect and is used for placing soil particles in the foundation bed surface layer 5 and loss of filled materials, and the waterproof inverted filter 83 is formed by combining waterproof geomembrane and short fiber needle-punched non-woven geotextile and is used for preventing water from penetrating into the foundation bed bottom layer 6.
The blind ditch 9 comprises a permeable supporting part 91 and non-woven geotextile wrapped outside the permeable supporting part 91, and the permeable supporting part 91 is of a right-angled trapezoid structure. The permeable supporting part 91 is made of permeable gravels, and the outer wall of the permeable supporting part is wrapped with non-woven geotextile, so that the permeable gravels have certain strength and can drain water while draining water.
The invention also provides a construction method for preventing slurry pumping of the ballastless track subgrade contact layer, which comprises the following steps:
s1: according to the design elevation of the foundation bed bottom layer 6, filling the foundation bed bottom layer 6, performing layered compaction, and filling the middle part of the top end of the foundation bed bottom layer 6 to form an arch structure;
the top middle part of foundation bed bottom 6 is filled and is the arch structure and be convenient for lay drainage piece 8 to make drainage piece 8 be the certain slope, can also prevent when the drainage that the fine aggregate in foundation bed top layer 5 from flowing into foundation bed bottom 6, increased foundation bed top layer 5's bearing capacity, can effectively alleviate the differential settlement and the deformation of road bed.
S2: paving a drainage piece 8 on the top of the foundation bed bottom layer 6, measuring and dividing the position of the drainage column unit 7, and fixing the drainage column unit 7 on the top of the drainage piece 8 according to the divided position of the drainage column unit 7;
the inverted filter 81, the three-dimensional geonet core 82 and the waterproof inverted filter 83 are sequentially laid from top to bottom, and are used for reinforcing the foundation bed surface layer 5 in combination with the drainage column unit 7 during drainage.
Along the longitudinal direction of the line, the arrangement distance of the drainage column units 7 is 0.8m to 1m within the range of the expansion joint and the front and back 1m of the foundation plate 3 of the ballastless track, and the arrangement distance of the drainage column units 7 is 1.2m to 1.5m outside the range of the expansion joint and the front and back 1m of the foundation plate 3.
The drainage column units 7 are symmetrically arranged along the transverse direction of the line at the interval of 1.0 m; the upper part of the drainage column unit 7 and the surface layer 5 of the foundation bed are required to be neatly arranged, and the requirement of the horizontal drainage gradient of the surface layer 5 of the foundation bed is met.
S3: filling blind ditches 9 below a cable duct of the ballastless track and at the central symmetrical position of the line, filling graded broken stones at the rest positions of the surface layer 5 of the foundation bed, and performing layering compaction;
s4: laying an anti-filtration system 10 on the top of the surface layer 5 of the foundation bed, and fixing the anti-filtration system 10 on the top of the drainage column unit 7;
the middle part of the reverse filtering system 10 is arched upwards, and both ends of the reverse filtering system 10 and both ends of the drainage piece 8 are arranged according to the gradient of 4% -5%. The drainage and drainage member 8 is laid at the bottom of the surface layer 5 of the foundation bed, and the reverse filtration system 10 is laid at the top of the surface layer 5 of the foundation bed along the whole length of the line.
S5: and pouring a concrete sealing layer 4 on the top of the reverse filtering system 10, and laying the base plate 3, the track plate 2 and the steel rail 1 at the same time.
Water enters the surface layer 5 of the foundation bed through a gap between the base plate 3 and the closed layer 4 or an expansion joint of the base plate 3, enters the drainage column unit 7 through the reverse filtration system 10 at the top of the surface layer 5 of the foundation bed, a permeable concrete column 71 in the drainage column unit 7 can support and reinforce the surface layer 5 of the foundation bed, part of water in the drainage column unit 7 enters the surface layer 5 of the foundation bed, and the water in the surface layer 5 of the foundation bed is discharged through the blind ditch 9 by virtue of the drainage capacity of the surface layer 5 of the foundation bed; and the other part of water enters the drainage and drainage piece 8 and is discharged along the two sides of the foundation bed surface layer 5 through the drainage and drainage piece 8, and the drainage and drainage piece 8 can effectively prevent the fine aggregate in the foundation bed surface layer 5 from flowing outwards.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. The utility model provides a structure that prevention ballastless track road bed contact bed mud pumping that turns over which characterized in that includes: the drainage reinforcement system and the inverse filter system (10) are arranged in the surface layer (5) of the foundation bed of the ballastless track subgrade;
the drainage reinforcing system comprises a plurality of drainage column units (7) arranged at intervals, drainage guide pieces (8) arranged at the bottoms of the drainage column units (7) and blind ditches (9) symmetrically arranged at two sides of the foundation bed surface layer (5) respectively, anti-system of straining (10) sets up the top on foundation bed top layer (5) and with a plurality of the top contact of drainage column unit (7), drainage piece (8) are located between foundation bed top layer (5) and foundation bed bottom (6) and the middle part is upwarp, the both ends of drainage piece (8) to the both sides on foundation bed top layer (5) extend.
2. The structure for preventing the mortar bleeding of the contact layer of the ballastless track subgrade according to the claim 1, characterized in that the drainage column unit (7) comprises a permeable concrete column (71) and a reverse filter geotextile (72) wrapped on the outer wall of the permeable concrete column (71), the top of the permeable concrete column (71) is in contact with the bottom of the reverse filter system (10), and the bottom of the permeable concrete column (71) is connected with the top of the drainage guide member (8).
3. The structure for preventing the slurry pumping of the contact layer of the ballastless track subgrade according to the claim 1, characterized in that the middle part of the reverse filtering system (10) is arched upwards.
4. The structure for preventing the slurry pumping of the contact layer of the ballastless track subgrade according to the claim 3, wherein both ends of the reverse filtering system (10) and both ends of the drainage and drainage member (8) are arranged according to the gradient of 4-5%.
5. The structure for preventing the contact layer of the ballastless track subgrade from grout pumping according to claim 2, wherein the drainage and flow guide member (8) comprises an inverted filter member (81), a three-dimensional geonet core (82) and a waterproof inverted filter member (83) which are sequentially arranged from top to bottom, and the inverted filter member (81) is in contact with the bottom of the permeable concrete column (71).
6. The structure for preventing the slurry pumping of the ballastless track subgrade contact layer according to the claim 1, characterized in that the blind ditch (9) comprises a water-permeable supporting component (91) and a non-woven geotextile wrapped outside the water-permeable supporting component (91), wherein the water-permeable supporting component (91) is of a right-angled trapezoid structure.
7. A construction method for preventing slurry pumping of a contact layer of a ballastless track subgrade is characterized by comprising the following steps of constructing by adopting the structure of claims 1 to 6:
s1: according to the design elevation of the foundation bed bottom layer (6), filling the foundation bed bottom layer (6), performing layered compaction, and filling the middle part of the top end of the foundation bed bottom layer (6) to form an arch structure;
s2: paving a drainage piece (8) on the top of the foundation bed bottom layer (6), measuring and dividing the position of the drainage column unit (7), and fixing the drainage column unit (7) on the top of the drainage piece (8) according to the divided position of the drainage column unit (7);
s3: filling blind ditches (9) below a cable duct of the ballastless track and at the position symmetrical to the center of the line, filling graded broken stones at the rest positions of the surface layer (5) of the foundation bed, and performing layered compaction;
s4: laying a reverse filtration system (10) on the top of the surface layer (5) of the foundation bed, and fixing the reverse filtration system (10) on the top of the drainage column unit (7);
s5: and pouring a closed layer (4) at the top of the reverse filtering system (10), and laying a base plate (3), a track plate (2) and a steel rail (1) at the same time.
8. The construction method for preventing the slurry pumping of the contact layer of the ballastless track subgrade according to the claim 7, wherein in the step S2, the arrangement mode of the drainage column units (7) is that along the longitudinal direction of the line, the arrangement distance of the drainage column units (7) is 0.8m to 1m within the range of the expansion joint of the base plate (3) of the ballastless track and the front and back 1m thereof, the arrangement distance of the drainage column units (7) is 1.2m to 1.5m outside the range of the expansion joint of the base plate (3) and the front and back 1m thereof.
9. The construction method for preventing the ballastless track subgrade contact layer from being subjected to mortar pumping according to claim 7, wherein the middle part of the reverse filtering system (10) is arched, and both ends of the reverse filtering system (10) and both ends of the drainage and flow guide member (8) are arranged according to a gradient of 4% -5%.
10. The construction method for preventing the slurry pumping of the ballastless track subgrade contact layer according to the claim 9, wherein the drainage and drainage member (8) is laid at the bottom of the surface layer (5) of the foundation bed and the reverse filtering system (10) is laid at the top of the surface layer (5) of the foundation bed along the whole length of the line.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994846.6A CN115262292A (en) | 2022-08-18 | 2022-08-18 | Structure and construction method for preventing slurry pumping of ballastless track roadbed contact layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210994846.6A CN115262292A (en) | 2022-08-18 | 2022-08-18 | Structure and construction method for preventing slurry pumping of ballastless track roadbed contact layer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115262292A true CN115262292A (en) | 2022-11-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210994846.6A Pending CN115262292A (en) | 2022-08-18 | 2022-08-18 | Structure and construction method for preventing slurry pumping of ballastless track roadbed contact layer |
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