CN117569122A - Non-uniform settlement grouting repairing method for ballastless track structure roadbed - Google Patents
Non-uniform settlement grouting repairing method for ballastless track structure roadbed Download PDFInfo
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- CN117569122A CN117569122A CN202410055240.5A CN202410055240A CN117569122A CN 117569122 A CN117569122 A CN 117569122A CN 202410055240 A CN202410055240 A CN 202410055240A CN 117569122 A CN117569122 A CN 117569122A
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- 238000000034 method Methods 0.000 title claims abstract description 25
- 201000010099 disease Diseases 0.000 claims abstract description 18
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 claims abstract description 18
- 239000000463 material Substances 0.000 claims description 30
- 238000007789 sealing Methods 0.000 claims description 29
- 239000010410 layer Substances 0.000 claims description 25
- 239000002002 slurry Substances 0.000 claims description 21
- 239000003292 glue Substances 0.000 claims description 16
- 239000002344 surface layer Substances 0.000 claims description 11
- 239000004570 mortar (masonry) Substances 0.000 claims description 9
- 230000000903 blocking effect Effects 0.000 claims description 6
- 229920001971 elastomer Polymers 0.000 claims description 6
- 239000000565 sealant Substances 0.000 claims description 5
- KXDHJXZQYSOELW-UHFFFAOYSA-M Carbamate Chemical compound NC([O-])=O KXDHJXZQYSOELW-UHFFFAOYSA-M 0.000 claims description 3
- 229920005830 Polyurethane Foam Polymers 0.000 claims description 3
- -1 hydroxyl compound Chemical class 0.000 claims description 3
- 239000012948 isocyanate Substances 0.000 claims description 3
- 150000002513 isocyanates Chemical class 0.000 claims description 3
- 239000011496 polyurethane foam Substances 0.000 claims description 3
- 238000006757 chemical reactions by type Methods 0.000 claims description 2
- 230000008439 repair process Effects 0.000 description 9
- 238000004062 sedimentation Methods 0.000 description 7
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- 229920002635 polyurethane Polymers 0.000 description 5
- 239000004814 polyurethane Substances 0.000 description 5
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- 239000011800 void material Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B1/00—Ballastway; Other means for supporting the sleepers or the track; Drainage of the ballastway
- E01B1/002—Ballastless track, e.g. concrete slab trackway, or with asphalt layers
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B2/00—General structure of permanent way
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/60—Planning or developing urban green infrastructure
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Railway Tracks (AREA)
Abstract
The invention discloses a method for repairing non-uniform settlement grouting of a ballastless track structure roadbed, which comprises the following steps: confirming uneven settlement disease points of the ballastless track structure roadbed, and respectively arranging a plurality of settlement center grouting holes, track plate grouting holes, base plate grouting holes and base plate side grouting holes at the side positions of the track plate, the base plate and the base plate; placing a sedimentation center grouting pipe, a track plate grouting pipe, a base plate grouting pipe and a base plate side grouting pipe into each sedimentation center grouting hole, a track plate grouting hole, a base plate grouting hole and a base plate side grouting hole correspondingly; grouting holes on the base plate and grouting holes on the side edge of the base plate; grouting to the grouting holes of the sedimentation center, and grouting to the grouting holes of the track plate; grouting along the longitudinal section direction of the line from the sedimentation center to the two ends of the track, and grouting along the transverse section direction from the two sides of the line to the center of the line; the gap at the side edge of the base plate is blocked.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a method for repairing non-uniform settlement grouting of a ballastless track structure roadbed.
Background
Along with the rapid increase of the railway running speed and the rapid increase of the traffic volume, the base of the high-speed railway is easy to generate uneven sedimentation diseases due to the influence of factors such as extreme rainfall climate, unfavorable geological conditions, different rigid structures in the line and the like, especially when the high-speed train is densely operated.
Uneven settlement formed on the surface of a high-speed railway roadbed can cause the geometric state of a track to be degraded, cause line irregularity, further exacerbate the interaction between a vehicle and the track, on one hand, the vibration of a track structure and a train is aggravated, the running stability and the safety of the train are affected, on the other hand, the deformation and the stress state of the track structure are caused to be worsened, and the long-term normal service performance of the track structure is seriously affected.
When the high-speed railway foundation is unevenly settled, for the ballastless track, the most common repairing mode of uneven settlement of the roadbed is to adjust the stroke of the fastener and change the rail to lower the height-adjusting backing plate, so as to recover the height of the track structure, however, the long-term action of dynamic load of the circulating train can accelerate the abrasion of the height-adjusting backing plate, the stroke of the fastener is limited, and when the uneven settlement of the roadbed exceeds the maximum stroke of the fastener, the height of the track structure is difficult to repair. In addition, the method of large-scale mechanical lifting is great to the destruction of track structure to the lift precision of machinery is coarse, extremely easily causes the defect condition that the track structure exceeds the lifting in disease district, and this construction operation is loaded down with trivial details, is difficult to cover the repair of low-grade high-speed railway roadbed differential settlement disease.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a method for repairing the non-uniform settlement grouting of a ballastless track structure roadbed.
The embodiment of the invention provides a method for repairing non-uniform settlement grouting of a ballastless track structure roadbed, which comprises the following steps:
confirming uneven settlement disease points of the ballastless track structure roadbed, and respectively arranging a plurality of settlement center grouting holes, track plate grouting holes, base plate grouting holes and base plate side grouting holes at the side positions of the track plate, the base plate and the base plate;
placing a sedimentation center grouting pipe, a track plate grouting pipe, a base plate grouting pipe and a base plate side grouting pipe into each sedimentation center grouting hole, a track plate grouting hole, a base plate grouting hole and a base plate side grouting hole correspondingly;
grouting holes on the base plate and grouting holes on the side edge of the base plate; grouting to the grouting hole of the sedimentation center; finally grouting the grouting holes of the track plate, wherein the grouting direction of the grouting holes of the track plate is along the longitudinal section direction of the line, namely the direction from the sedimentation center to the two ends of the track, and along the cross section direction, namely the direction from the two sides of the line to the center of the line;
the gap at the side edge of the base plate is blocked.
Further, the sedimentation center grouting hole is arranged at the cross section where the uneven sedimentation maximum position is located;
three rows of track plate grouting holes are distributed on the track plate along the longitudinal direction of the track, wherein the track plate grouting holes in the middle row are positioned on the longitudinal central line of the track, and the track plate grouting holes in the two rows on the side are symmetrical with the track plate grouting holes in the middle row;
along the longitudinal direction of the track, the distance between the adjacent track plate grouting holes, the base plate grouting holes or the base plate side grouting holes is the distance of a fastener;
the grouting holes of the track plates, the grouting holes of the base plates and the grouting holes of the side edges of the base plates between adjacent columns are staggered.
Further, lay a plurality of respectively at track board, bed plate and bed plate side position and subside central grouting hole, track board grouting hole, bed plate grouting hole and bed plate side grouting hole include:
drilling the sedimentation center grouting hole, the track plate grouting hole and the base plate grouting hole in a vertical mode, wherein the sedimentation center grouting hole and the track plate grouting hole are drilled 8-10 cm below the bottom surface of the base plate; the grouting hole of the base plate is drilled to be 18-20 cm below the bottom surface of the base plate;
the grouting holes on the side edges of the base plate are drilled in an inclined mode, the inclination angle is 45 degrees+/-3 degrees, and the grouting holes are drilled into the surface layer of the base plate for 18-20 cm.
Further, lay a plurality of respectively at track board, bed plate and bed plate side position and subside central grouting hole, track board grouting hole, bed plate grouting hole and bed plate side grouting hole still include:
a blind hole is blocked at the grouting hole of the base plate and the grouting hole of the track plate; the blind holes are sealed by the grouting pipe, and the blind holes comprise slurry overflow preventing holes and grouting pipe sealing holes which are in a step shape.
Further, the structures of the sedimentation center grouting pipe, the track plate grouting pipe, the base plate grouting pipe and the base plate side grouting pipe comprise connecting buckles and preset fractures which are sequentially arranged;
the foundation bed comprises a settlement center grouting pipe, a track plate grouting pipe, a base plate grouting pipe and a hollowed pipe, wherein the side surface and the bottom surface of the portion, inserted into the surface layer of the foundation bed, of the base plate side grouting pipe are hollowed out, and a plurality of threads are arranged on the hollowed pipe.
Further, the distance between the position of the preset fracture of the grouting pipe of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the base plate and the depth of the plugging hole of the grouting pipe;
the distance between the position of the preset fracture of the grouting pipe of the track plate and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate, the thickness of the CA mortar layer and the thickness of the track plate minus the depth of the plugging hole of the grouting pipe;
the distance between the position of the preset fracture of the sedimentation center grouting pipe and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate, the thickness of the CA mortar layer and the thickness of the track plate, and the depth of the plugging hole of the grouting pipe is subtracted;
the distance between the position of the preset fracture of the grouting pipe at the side edge of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the sealing layer at the side edge of the base plate and the thickness of the sealing strip at the side edge.
Further, grouting is performed to the grouting holes of the track plate, wherein the grouting direction of the grouting holes of the track plate is along the longitudinal section direction of the line, namely, the direction from the sedimentation center to the two ends of the track, and the grouting direction along the cross section direction, namely, the direction from the two sides of the line to the center of the line comprises the following steps:
grouting the grouting holes of the track plate from the position of the grouting hole of the sedimentation center to the directions of the two ends of the track plate along the longitudinal section direction of the line, and grouting the grouting holes of the track plate from the grouting holes of the track plate in the two rows of the side edges to the longitudinal center line of the track along the transverse section direction; when the track is restored to be horizontal, continuously lifting the track to the first lifting amount, and stopping grouting;
setting a second lifting amount of the rail at the grouting hole of the single rail plate, adjusting grouting pressure when the lifting amount of the rail at the grouting hole of the single rail plate exceeds the second lifting amount until the rail is restored to the horizontal state, and stopping grouting after the rail is continuously lifted to the first lifting amount;
when the grouting amount corresponding to the grouting holes of the single track plate exceeds kg, if the lifting amount of the track is not obvious, checking whether slurry leakage exists or not; if slurry leakage occurs, plugging a grouting hole of a base plate of the slurry leakage and/or a grouting hole at the side of the base plate; and then grouting is continued until the rail is restored to the horizontal state, and grouting is stopped after the rail is continuously lifted to the first lifting amount.
Further, the grouting material is a bi-component non-aqueous reaction rigid polyurethane foam material, and consists of isocyanate of the component A and hydroxyl compound of the component B in a volume ratio of 1:1 to react to generate carbamate.
Further, the side gap of the plugging base plate comprises:
cutting the side edge of the base plate along the longitudinal direction of the rail to form a sealing groove;
cutting a sealant fixing clamping groove in the sealing groove at intervals of unit distance;
and injecting glue into the sealing groove and the sealing glue fixing clamping groove to form the waterproof rubber strip at the side edge of the base plate.
Further, the method further comprises:
after grouting is completed, breaking off the rest grouting pipes through preset fracture on the grouting pipes; then, the grouting pipe is plugged through the grouting holes of the base plate and the blind plugging holes arranged at the grouting holes of the track plate, and the plugging positions are polished after plugging is completed.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention sets a grouting sequence of grouting holes on the base plate, grouting holes on the side of the base plate, grouting holes on the sedimentation center and grouting holes on the track plate; the supporting rigidity of the grouting material is influenced by the extrusion of surrounding grouting materials or soil, and the dual grouting of the grouting holes of the base plate and the grouting holes at the side edge of the base plate firstly enables a closed confining pressure wall to be formed in a non-uniform settlement disease area, and the confining pressure wall provides enough confining pressure for the grouting material injected through the grouting holes of the track plate, so that the supporting rigidity of the grouting material injected in the disease area is ensured.
(2) The invention sets the grouting direction of grouting to the grouting holes of the track plate along the direction from the sedimentation center to the two ends of the track along the longitudinal section direction of the track and along the direction from the two sides of the track to the center of the track along the cross section direction, and grouting operation based on the grouting direction can further squeeze grouting materials which are already injected to the uneven sedimentation center position, thereby effectively ensuring the supporting rigidity of grouting materials in the disease area.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of differential settlement of a ballastless track structure roadbed provided by an embodiment of the invention; wherein (A) in FIG. 1 is a schematic vertical section view of the non-uniform settlement of the ballastless track structure roadbed, and (B) in FIG. 1 is a schematic cross section view of the non-uniform settlement of the ballastless track structure roadbed;
FIG. 2 is a flow chart of a method for repairing non-uniform settlement grouting of a ballastless track structure roadbed provided by the embodiment of the invention;
FIG. 3 is a top view of hole site layout of non-uniform settlement grouting holes of a ballastless track structure roadbed provided by the embodiment of the invention;
FIG. 4 is a schematic vertical section of a hole site layout of non-uniform settlement grouting holes of a ballastless track structure roadbed provided by the embodiment of the invention;
FIG. 5 is a schematic diagram of a blind hole plugging method according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a track slab grouting pipe according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a layout cross section of grouting pipes of a base plate according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of a layout cross section of a grouting pipe of a track slab according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a layout cross section of a sedimentation center grouting pipe provided by an embodiment of the invention;
FIG. 10 is a schematic view of a side waterproof seal for a base plate according to an embodiment of the present invention; fig. 10 (a) is a schematic vertical section view of the seal groove, and fig. 10 (B) is a schematic vertical section view of the sealant fixing clip groove;
FIG. 11 is a graph of the rebound modulus and cumulative sedimentation unit test results for a polyurethane grouting repair material;
FIG. 12 is a graph showing the results of a full-scale model test of track plate displacement response after differential settlement repair and large-cycle loading.
In the figure: 1-rail and fastener assembly, 2-track slab, 3-CA mortar layer, 4-base plate, 5-foundation bed layer, 6-round boss, 7-void, 8-foundation bed layer, 9-foundation layer, 10-concrete closing layer, 1101-base plate side grouting holes, 1102-base plate side grouting pipes, 1201-base plate grouting holes, 1202-base plate grouting pipes, 1301-track slab grouting holes, 1302-track slab grouting pipes, 1401-sedimentation center grouting holes, 1402-sedimentation center grouting pipes, 15-longitudinal grouting direction, 16-cross section grouting direction, 17-preset fracture, 18-connecting buckle, 19-hollowed pipe threads, 20-base plate side waterproof rubber strips, 21-slurry overflow preventing holes and 22-grouting pipe plugging holes.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The features of the following examples and embodiments may be combined with each other without any conflict.
As shown in fig. 1, fig. 1 (a) is a schematic vertical section view of non-uniform settlement of a ballastless track structure roadbed, fig. 1 (B) is a schematic cross section view of non-uniform settlement of a ballastless track structure roadbed, and the components of the ballastless track of the high-speed railway from top to bottom are respectively as follows: rail and fastener assembly 1, track slab 2, CA mortar layer 3, bed plate 4, foundation bed surface layer 5, foundation bed bottom layer 8, road foundation soil layer 9. A round boss 6 is arranged between the adjacent track plates 2, and a concrete sealing layer 10 is arranged on the surface of the foundation bed surface layer 5.
The roadbed is used as a direct carrier for transmitting power load of a train by a track structure, and the high-speed railway line bears the train reciprocating load of large cycles due to high operation density, and the gradually ascending additional dynamic stress generated by the high-speed running of the train accelerates the settlement of the railway roadbed. Secondly, under the influence of rain fall, moisture continuously invades the roadbed and accumulates, so that the roadbed support rigidity is weakened. Again, under the influence of the geological conditions of the soil, the deep soft soil layer with high water content, low bearing capacity and high compressibility is easy to excessively settle under the action of dynamic load. Meanwhile, the road-bridge and road-tunnel transition sections have the condition of abrupt change of the supporting rigidity of the line, and the settlement development of the position is also quicker. Due to the factors of train operation density, extreme rainfall climate, unfavorable geological conditions, different rigid structures in the lines and the like, the base of the high-speed railway is easy to be unevenly settled, and the rigidity of the base plate is higher, so that the base plate 4 can form a void 7 at the bottom.
Filling the void area caused by the uneven settlement of the roadbed, ensuring the supporting rigidity of the filler, blocking the rainwater invasion channel to ensure the long-term normal service performance of the roadbed after grouting repair, and is the key for repairing the uneven settlement of the roadbed of the ballastless track structure. In view of the above, the invention provides a method for repairing non-uniform settlement grouting of a ballastless track structure roadbed, as shown in fig. 2, the method comprises the following steps:
step S1, confirming uneven settlement disease points of the ballastless track structure roadbed, and respectively arranging a plurality of settlement center grouting holes 1401, track plate grouting holes 1301, base plate grouting holes 1201 and base plate side grouting holes 1101 at the side edge positions of the track plate 2, the base plate 4 and the base plate 4.
Specifically, as shown in fig. 3 and 4, fig. 3 shows a top view of the arrangement positions of the non-uniform settlement grouting holes of the ballastless track structure roadbed, and fig. 4 shows a schematic vertical section of the arrangement positions of the non-uniform settlement grouting holes of the ballastless track structure roadbed.
Wherein, the sedimentation center grouting hole 1401 is arranged at the cross section of the uneven sedimentation maximum position; further, the maximum uneven settlement position is generally positioned on the cross section where the round boss is positioned, and the maximum uneven settlement position can be confirmed by the maximum point of vertical displacement in the inspection data of the rail inspection vehicle; in this example, a settlement center grouting hole 1401 is arranged on the cross section where the circular boss 6 is located.
Three rows of track plate grouting holes 1301 are distributed on the track plate 2 along the longitudinal direction of the track, wherein the track plate grouting hole 1301 in the middle row is positioned at the longitudinal center line of the track, and the track plate grouting holes 1301 in the two rows on the side are symmetrical with respect to the track plate grouting hole 1301 in the middle row. In this example, the distance between the two side rail plate grouting holes 1301 and the side edge of the rail plate 2 is 15 cm, and the distance between the rail plate grouting holes 1301 adjacent in the rail cross-sectional direction is 105 cm.
Further, the spacing between adjacent track plate grouting holes 1301, base plate grouting holes 1201 and base plate side grouting holes 1101 in each column along the longitudinal direction of the track is the distance of one fastener, typically 63 cm.
Further, the track plate grouting holes 1301, the base plate grouting holes 1201 and the base plate side grouting holes 1101 between adjacent columns are staggered.
In the process of arranging a plurality of sedimentation center grouting holes 1401, track plate grouting holes 1301, base plate grouting holes 1201 and base plate side grouting holes 1101 at the side edge positions of the track plate 2, the base plate 4 and the base plate 4, the method comprises the following steps: the settlement center grouting hole 1401, the track plate grouting hole 1301 and the base plate grouting hole 1201 are all drilled in a vertical mode, wherein the settlement center grouting hole 1401 and the track plate grouting hole 1301 are drilled to be 8-10 cm below the bottom surface of the base plate 4, and the base plate grouting hole 1201 is drilled to be 18-20 cm below the bottom surface of the base plate 4; the grouting holes 1101 on the side of the base plate are drilled in an inclined mode, the inclination angle is 45 degrees plus or minus 3 degrees, and the holes are drilled into the surface layer 5 of the base bed by 18-20 cm.
Further, in this example, a drill bit with a diameter of 16 mm is used for drilling, and the drilling sequence is not limited, and the same type of grouting Kong Xu can be used for drilling all at once. After drilling is completed, the steel bars with the diameter of 14 mm are adopted to dredge all grouting holes in the embodiment, so that all grouting holes are ensured to be unobstructed.
Further, the step S1 further includes: the base plate grouting holes 1201 (except the base plate grouting holes 1201 between the two track plates 2) and the track plate grouting holes 1301 are provided with blocking blind holes, and the blocking blind holes consist of step-shaped slurry overflow preventing holes 21 and grouting pipe blocking holes 22. In this example, the sedimentation center grouting hole 1401 on the cross section where the circular boss 6 is located is also required to be provided with a plugging blind hole. As shown in fig. 5, in this example, the slurry overflow prevention hole has a hole diameter of 2 cm and a hole depth of 3 cm; the aperture of the grouting pipe plugging hole is 3 cm, and the hole depth is 3 cm.
In step S2, a settlement center grouting pipe 1402, a track plate grouting pipe 1302, a base plate grouting pipe 1202 and a base plate side grouting pipe 1102 are placed in each of the settlement center grouting hole 1401, the track plate grouting hole 1301, the base plate grouting hole 1201 and the base plate side grouting hole 1101.
As shown in fig. 6, the structures of the sedimentation center grouting pipe 1402, the track slab grouting pipe 1302, the base slab grouting pipe 1202 and the base slab side grouting pipe 1102 include a connecting buckle 18 and a preset fracture 17 which are sequentially arranged. The parts of the sedimentation center grouting pipe 1402, the track plate grouting pipe 1302, the base plate grouting pipe 1202 and the base plate side grouting pipe 1102 inserted into the surface layer of the base bed are side and bottom hollow pipes, and a plurality of threads 19 are arranged on the hollow pipes. The sedimentation center grouting pipe 1402, the track plate grouting pipe 1302, the base plate grouting pipe 1202 and the base plate side grouting pipe 1102 are connected with a grouting gun through connecting buckles 18. The preset fracture 17 is used for removing residual grouting pipes.
Further, the distance between the position of the preset fracture of the grouting pipe 1202 of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the base plate 4 and the depth of the grouting pipe plugging hole 22; the distance between the position of the preset fracture of the track plate grouting pipe 1302 and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate 4, the thickness of the CA mortar layer 3 and the thickness of the track plate 2 minus the depth of the grouting pipe plugging hole 22; the distance between the position of the preset fracture of the sedimentation center grouting pipe 1402 and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate 4, the thickness of the CA mortar layer 3 and the thickness of the track plate 2 minus the depth of the grouting pipe plugging hole 22; the distance between the position of the preset fracture of the grouting pipe 1102 at the side edge of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the sealing layer at the side edge of the base plate and the thickness of the sealing strip at the side edge.
It should be noted that, the end (i.e. the bottom surface) of the grouting pipe hollow pipe is also provided with a closed hollow structure, which slows down the ejection speed of the slurry from the end of the hollow pipe. At present, most grouting pipes adopt open ports, the tail ends of the grouting pipes are not hollow bottom surfaces, and the hollow arrangement of the end parts of the grouting pipes ensures that slurry is uniformly sprayed out in the hollow pipe range, so that grouting materials are ensured to fill sedimentation and void areas more uniformly. Meanwhile, the arrangement of the raised threads 19 in the hollow pipe provides space for the spraying of the slurry, and the diffusion effect of the slurry in the surface layer of the foundation bed is better ensured.
Further, fig. 7 shows a schematic cross-sectional view of the base plate grouting pipe layout; FIG. 8 shows a schematic cross-sectional view of a track slab grouting pipe layout; FIG. 9 shows a schematic cross-sectional view of a settling center grouting pipe layout; after the sedimentation center grouting pipe 1402, the track plate grouting pipe 1302, the base plate grouting pipe 1202 and the base plate side grouting pipe 1102 are inserted to a preset depth, a steel bar dredging grouting pipe with the diameter of 10 mm can be adopted to ensure that the grouting pipes are smooth; if the grouting pipe cannot be inserted to the preset depth, the drilling machine should drill back in time, so that the grouting pipe is ensured to be inserted to the preset depth.
Illustratively, in this example, the portion of the sedimentation center grouting pipe 1402, the track plate grouting pipe 1302, the base plate grouting pipe 1202, and the base plate side grouting pipe 1102 inserted into the foundation bed surface layer 5 is a hollow pipe, wherein four threads 19 are provided on the hollow pipes of the sedimentation center grouting pipe 1402 and the track plate grouting pipe 1302 in total, the length of each thread 19 is 5 mm, the distance between adjacent threads is 25 mm, nine threads 19 are provided on the hollow pipes of the base plate grouting pipe 1202 and the base plate side grouting pipe 1102 in total, the diameter of the grouting pipe is 12 mm, the diameter of the hollow pipe is 10 mm, and the wall thickness is 1 mm. The length of the preset fracture corresponding to the grouting pipe 1202 of the base plate from the hollowed-out position of the grouting pipe is 27 cm, namely 27 cm =thickness of the base plate (h=30 cm) -depth of the plugging hole of the grouting pipe (h=3 cm); the lengths of the preset fracture distances corresponding to the track slab grouting pipe 1302 and the sedimentation center grouting pipe 1402 from the hollow positions of the grouting pipe are 52 cm, namely 52 cm =the thickness of the base plate (h=30 cm) +the thickness of the CA mortar layer (h=5 cm) +the thickness of the track slab (h=20 cm) -the depth of the plugging holes of the grouting pipe (h=3 cm); the length of the preset fracture of the grouting pipe 1102 at the side of the base plate from the hollowed-out position of the grouting pipe is 2 cm, namely 3 cm =the thickness of the side sealing layer (H=5 cm) -the thickness of the side sealing strip (H=3 cm).
Further, the step S2 further includes: the gap between the grouting pipe and the grouting hole is plugged through the slurry overflow preventing hole 21, and the quick setting concrete is plugged.
Step S3, grouting holes 1201 and side grouting holes 1101 of the base plate are firstly formed; grouting to a settlement center grouting hole 1401; and finally grouting the track plate grouting holes 1301, wherein the grouting direction of the track plate grouting holes 1301 is from the sedimentation center to the two ends of the track along the longitudinal section direction of the line, and from the two sides of the line to the center of the line along the transverse section direction.
Specifically, the step S3 specifically includes the following steps:
step S301, grouting is performed first in the grouting holes 1201 of the base plate and the grouting holes 1101 of the side edges of the base plate to form a wall for surrounding the grouting material in the diseased area, and when the maximum lifting amount of the sedimentation center reaches a preset threshold (in this example, set to 0.5 mm), grouting is stopped
In step S302, grouting is performed in the direction from both sides of the line to the center of the line along the cross-sectional direction through the settlement center grouting hole 1401, and when the track is continuously lifted to the first lifting amount after horizontal recovery, the grouting is stopped, and in this example, the first lifting amount is set to be 0.1 mm.
Step S303, grouting the track plate grouting holes 1301 from the position of the settlement center grouting hole 1401 to the directions of the two ends of the track plate 2 along the longitudinal section direction of the line, and grouting the track plate grouting holes 1301 positioned on the longitudinal center line of the track from the track plate grouting holes 1301 of the two side rows along the transverse section direction; and stopping grouting when the rail is continuously lifted to the first lifting amount after the rail is restored to the horizontal state.
Setting a second lifting amount of the rail at the grouting hole of the single rail plate, adjusting grouting pressure when the lifting amount of the rail at the grouting hole of the single rail plate exceeds the second lifting amount, and stopping grouting when the rail is continuously lifted to the first lifting amount after the rail is restored to be horizontal.
When the grouting amount corresponding to the grouting holes of the single track plate exceeds 3 kg, if the lifting amount of the track is not obvious, checking whether slurry leakage exists or not; if leakage occurs, plugging the leaked base plate grouting holes 1201 and/or the base plate side grouting holes 1101; and then grouting is continued until the track is restored to be horizontal, and grouting is stopped after the first lifting amount is continuously lifted.
Illustratively, grouting is performed in the direction from the sedimentation center to the two ends of the rail along the longitudinal section direction of the rail, grouting is performed in the direction from the two sides of the rail to the center of the rail along the transverse section direction, grouting is performed in the grouting holes 1301 of the rail plate, and grouting is stopped when the lifting amount of continuous lifting after the rail is restored to the horizontal state is 0.1 mm. When the lifting amount of the single grouting track exceeds the limit, the grouting pressure is respectively adjusted to 4/5, 3/5, 2/5 and 1/5 of the maximum grouting pressure, and then grouting is continued until the track is lifted by 0.1 mm after horizontal recovery; if the grouting amount corresponding to the grouting holes of the single track plate exceeds 3 kg, the lifting amount of the track is still not obvious, whether leakage occurs is needed to be checked, if leakage occurs, a leakage opening needs to be plugged in time, then grouting is continued until the track level is restored, and then the grouting is stopped after the track level is lifted by 0.1 mm.
Further, in the example, the grouting material is a two-component non-water reaction type rigid polyurethane foam material, and consists of isocyanate of the component A and hydroxyl compound of the component B in a volume ratio of 1:1 to generate carbamate. Grouting by adopting a high-precision grouting machine, wherein the precision of the pressure increment is 1 kPa, the A, B components in a grouting gun of the grouting machine are mixed by adopting high pressure, the mixing pressure is 6.0 MPa, and the mixing temperature is 45 ℃; in the formal grouting, grouting is performed at low pressure, and the maximum grouting pressure is 1.5 MPa.
And S304, finely adjusting the stroke of the anchor bolt in the fastener and the thickness of the rail down-regulating high backing plate, and recovering the smoothness of the rail.
It should be noted that, the grouting of the base plate grouting holes 1201 and the base plate side grouting holes 1101 is an important step, the grouting operation of the base plate grouting holes 1201 forms the confining pressure wall in the uneven settlement disease area, and the grouting operation of the base plate side grouting holes 1101 which are arranged to cross the base plate grouting holes 1201 further reinforces the confining pressure wall which is already formed; the supporting rigidity of the polyurethane slurry in the disease area is closely related to the confining pressure around the polyurethane slurry, and the slurry confining pressure wall formed by the two grouting operations in the surface layer of the foundation bed in the disease area can provide enough confining pressure for the slurry in the uneven settlement disease area so as to ensure that the slurry injected in the disease area has enough supporting strength.
Meanwhile, the grouting direction of the grouting holes 1301 of the track plate is an important step, grouting is performed along the direction from two sides of the line to the center of the line along the cross section direction, namely grouting is performed on two sides of the line and then performed on the center of the line, grouting materials on two sides of the line can be further extruded in a grouting mode, and thus the filling effect of a seriously settled area in (B) in FIG. 1 is more obvious; grouting is carried out along the longitudinal section direction of the line from the sedimentation center to the directions of the two ends of the line, namely, grouting is carried out on the sedimentation center first, then grouting is carried out on the two ends of the line, grouting materials in the sedimentation center can be further extruded in the grouting mode, and thus the filling effect of the sedimentation serious area in (A) in FIG. 1 is more obvious.
And S4, plugging a side gap of the base plate 4.
Specifically, the step S4 includes: cutting the concrete sealing layer 10 along the longitudinal direction of the rail at a side position close to the base plate 4 to form a sealing groove, wherein the cross section of the sealing groove is shown as (A) in FIG. 10; cutting a sealant fixing clip groove at the bottom of the base plate 4 at unit distance in the sealing groove, the sectional view of which is shown in (B) of fig. 10; and injecting glue into the sealing groove and the sealing glue fixing clamping groove to form the waterproof rubber strip 20 at the side edge of the base plate.
Illustratively, a sealing layer on the side edge of the base plate is cut by a cutting machine along the longitudinal direction of the rail to form a sealing groove with the width of 2 cm and the depth of 3 cm, a sealing glue fixing clamping groove is cut at the interval of 1 m, and the clamping groove has the following dimensions: length x width x height = 5 cm x 10 cm x 3 cm; the residue in the seal groove is removed, the seal groove is filled with glue by adopting a glue filling gun, the glue filling material is caulking sealant special for a high-speed rail, an art designing adhesive tape is required to be posted before glue filling, no bubble or cavity is required to be avoided in the adhesive body during glue filling, a scraper is used for evenly pressing and trimming the appearance of the adhesive body after glue filling, a base plate side waterproof rubber strip 20 is formed, the rubber strip is 45 degrees, water accumulation is avoided, a seal glue fixing clamping groove is arranged, the seal glue, the base plate and a side sealing layer are formed into an integral structure, the integral stability is enhanced, and as shown in fig. 10, the side gap of the base plate is sealed by adopting the seal glue, so that the influence of rainwater on the long-term service performance of the grouting material is isolated.
Further, the method of the invention further comprises:
s5, breaking off the rest grouting pipes through preset fracture 17 on the grouting pipes after grouting is completed; then, the grouting pipe is plugged through the plugging blind holes formed in the grouting holes 1201 of the base plate and the grouting holes 1301 of the track plate, and the plugging positions are polished after plugging is finished, so that the plugging surface is smooth and attractive.
Before the construction of non-uniform settlement grouting repair of the ballastless track structure roadbed is started, the mechanical properties of grouting materials and the long-term service performance of the repaired track-roadbed are required to be developed for experimental study.
Specifically, the unit body size of the grouting repair material is phi 200 mm ×H250 mm, a loading curve is a sine loading curve, the loading amplitude is 80 kPa, the loading frequency is 10 Hz, the loading cycle is 300 ten thousand times, the rebound modulus and the accumulated sedimentation change of the polyurethane grouting material under the large cycle loading are shown as fig. 11, the rebound modulus of a polyurethane sample is basically stabilized at 120 MPa, and the accumulated deformation of the sample is 0.39 mm; the built track-roadbed structure model in the full-scale physical model test is consistent with the track-roadbed structure of an operation defect line, the simulated train load is a CRH3 train with 17 t axle weight, the fatigue loading cycle after grouting repair is about 80 ten thousand times, the track plate displacement response time course curves before and after grouting and after large-cycle loading are shown in fig. 12, the displacement response of the track plate after grouting is slightly increased, the displacement after large-cycle loading is reduced to an initial state, the grouting material is further compacted after large-cycle loading, and the supporting rigidity of the roadbed after repair is matched with the initial rigidity of the roadbed, so that the requirement is met.
In summary, the invention sets the grouting sequence of grouting holes on the base plate and grouting holes on the side of the base plate, grouting holes on the sedimentation center, and grouting holes on the track plate; the supporting rigidity of the grouting material is influenced by the extrusion of surrounding grouting materials or soil, and the dual grouting of the grouting holes of the base plate and the grouting holes at the side edge of the base plate firstly enables a closed confining pressure wall to be formed in a non-uniform settlement disease area, and the confining pressure wall provides enough confining pressure for the grouting material injected through the grouting holes of the track plate, so that the supporting rigidity of the grouting material injected in the disease area is ensured.
The invention sets the grouting direction of grouting to the grouting holes of the track plate along the direction from the sedimentation center to the two ends of the track along the longitudinal section direction of the track and along the direction from the two sides of the track to the center of the track along the cross section direction, and grouting operation based on the grouting direction can further squeeze grouting materials which are already injected to the uneven sedimentation center position, thereby effectively ensuring the supporting rigidity of grouting materials in the disease area.
The above embodiments are merely for illustrating the design concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement the same, the scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications according to the principles and design ideas of the present invention are within the scope of the present invention.
Claims (10)
1. The method for repairing the non-uniform settlement grouting of the ballastless track structure roadbed is characterized by comprising the following steps of:
confirming uneven settlement disease points of a ballastless track structure roadbed, and respectively arranging a plurality of settlement center grouting holes (1401), track plate grouting holes (1301), base plate grouting holes (1201) and base plate side grouting holes (1101) at the side positions of a track plate (2), a base plate (4) and the base plate (4);
placing a sedimentation center grouting pipe (1402), a track plate grouting pipe (1302), a base plate grouting pipe (1202) and a base plate side grouting pipe (1102) into each sedimentation center grouting hole (1401), a track plate grouting hole (1301), a base plate grouting hole (1201) and a base plate side grouting hole (1101) correspondingly;
grouting holes (1201) and side grouting holes (1101) of the base plate; grouting is carried out to a sedimentation center grouting hole (1401); finally grouting the track plate grouting holes (1301), wherein the grouting direction of the track plate grouting holes (1301) is along the longitudinal section direction of the line, namely the direction from the sedimentation center to the two ends of the track, and along the cross section direction, namely the direction from the two sides of the line to the center of the line;
the gap at the side edge of the base plate (4) is blocked.
2. The ballastless track structure roadbed uneven settlement grouting repairing method according to claim 1, wherein a settlement center grouting hole (1401) is arranged at a cross section where an uneven settlement maximum position is located;
three rows of track plate grouting holes (1301) are distributed on the track plate (2) along the longitudinal direction of the track, wherein the track plate grouting holes in the middle row are positioned on the longitudinal central line of the track, and the track plate grouting holes in the two rows on the side are symmetrical relative to the track plate grouting holes in the middle row;
the distance between adjacent track plate grouting holes (1301), base plate grouting holes (1201) or base plate side grouting holes (1101) along the longitudinal direction of the track is the distance of one fastener;
the track plate grouting holes (1301), the base plate grouting holes (1201) and the base plate side grouting holes (1101) between adjacent columns are arranged in a staggered mode.
3. The ballastless track structure roadbed uneven settlement grouting repairing method according to claim 1, wherein arranging a plurality of settlement center grouting holes (1401), track plate grouting holes (1301), base plate grouting holes (1201) and base plate side grouting holes (1101) at side positions of a track plate (2), a base plate (4) and a base plate (4) respectively comprises:
the settlement center grouting hole (1401), the track plate grouting hole (1301) and the base plate grouting hole (1201) are all drilled in a vertical mode, wherein the settlement center grouting hole (1401) and the track plate grouting hole (1301) are drilled to be 8-10 cm below the bottom surface of the base plate (4); the grouting holes (1201) of the base plate are drilled to 18-20 cm below the bottom surface of the base plate (4);
the grouting holes (1101) on the side edges of the base plate are drilled in an inclined mode, the inclination angle is 45 degrees+/-3 degrees, and the holes are drilled into the surface layer (5) of the base plate for 18-20 cm.
4. The ballastless track structure roadbed uneven settlement grouting repairing method according to claim 2, wherein a plurality of settlement center grouting holes (1401), track slab grouting holes (1301), base slab grouting holes (1201) and base slab side grouting holes (1101) are respectively arranged at side positions of the track slab (2), the base slab (4) and the base slab (4), and further comprises:
a blind hole is blocked at the grouting hole (1201) of the base plate and the grouting hole (1301) of the track plate; the blind hole blocking device comprises a slurry overflow preventing hole (21) and a grouting pipe blocking hole (22) which are in a step shape.
5. The ballastless track structure roadbed uneven settlement grouting repairing method according to claim 1, wherein the structures of the settlement center grouting pipe (1402), the track slab grouting pipe (1302), the base slab grouting pipe (1202) and the base slab side grouting pipe (1102) comprise connecting buckles (18) and preset fractures (17) which are sequentially arranged;
the foundation bed comprises a settlement center grouting pipe (1402), a track plate grouting pipe (1302), a base plate grouting pipe (1202) and a base plate side grouting pipe (1102), wherein the side surface and the bottom surface of the portion, inserted into the surface layer of the foundation bed, of the portion are hollow pipes, and a plurality of threads (19) are arranged on the hollow pipes.
6. The method for repairing the non-uniform settlement grouting of the ballastless track structure roadbed according to claim 5, wherein the distance between the position of a preset fracture of the grouting pipe (1202) of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the base plate (4) and the depth of a plugging hole (22) of the grouting pipe;
the distance between the position of a preset fracture of the track plate grouting pipe (1302) and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate (4), the thickness of the CA mortar layer (3) and the thickness of the track plate (2) minus the depth of a grouting pipe plugging hole (22);
the distance between the position of a preset fracture of the sedimentation center grouting pipe (1402) and the position of the hollowed-out starting position of the grouting pipe is the sum of the thickness of the base plate (4), the thickness of the CA mortar layer (3) and the thickness of the track plate (2), and the depth of a grouting pipe plugging hole (22) is subtracted;
the distance between the position of the preset fracture of the grouting pipe (1102) at the side edge of the base plate and the position of the hollowed-out starting position of the grouting pipe is the difference between the thickness of the sealing layer at the side edge of the base plate (4) and the thickness of the sealing strip at the side edge.
7. The ballastless track structure roadbed uneven settlement grouting repairing method according to claim 1, wherein grouting is performed to a track plate grouting hole (1301), wherein the grouting direction of the track plate grouting hole (1301) is a direction along a longitudinal section direction of a line, namely, a direction from a settlement center to two ends of a track, and the grouting direction along a cross section direction, namely, a direction from two sides of the line to the center of the line comprises:
grouting the track plate grouting holes (1301) from the position of the sedimentation center grouting holes (1401) to the directions of the two ends of the track plate (2) along the longitudinal section direction of the line, and grouting the track plate grouting holes (1301) positioned at the longitudinal center line of the track from the track plate grouting holes (1301) of the two rows of the side edges along the transverse section direction; when the track is restored to be horizontal, continuously lifting the track to the first lifting amount, and stopping grouting;
setting a second lifting amount of the rail at the grouting hole of the single rail plate, adjusting grouting pressure when the lifting amount of the rail at the grouting hole of the single rail plate exceeds the second lifting amount until the rail is restored to the horizontal state, and stopping grouting after the rail is continuously lifted to the first lifting amount;
when the grouting amount corresponding to the grouting holes of the single track plate exceeds 3 kg, if the lifting amount of the track is not obvious, checking whether slurry leakage exists or not; if slurry leakage occurs, the grouting holes (1201) of the base plate and/or the grouting holes (1101) at the side of the base plate are/is plugged; and then grouting is continued until the rail is restored to the horizontal state, and grouting is stopped after the rail is continuously lifted to the first lifting amount.
8. The method for repairing the non-uniform settlement grouting of the ballastless track structure roadbed according to claim 1 or 7, wherein the grouting material is a bi-component non-aqueous reaction type hard polyurethane foam material, and the grouting material is formed by reacting an isocyanate component A and a hydroxyl compound component B according to a volume ratio of 1:1 to generate carbamate.
9. The ballastless track structure roadbed non-uniform settlement grouting repairing method according to claim 1, wherein the step of plugging the side gap of the base plate (4) comprises the steps of:
cutting the position of the concrete sealing layer (10) close to the side edge of the base plate (4) along the longitudinal direction of the rail to form a sealing groove;
cutting a sealant fixing clamping groove at the bottom of the base plate (4) at intervals of unit distance in the sealing groove;
and injecting glue into the sealing groove and the sealing glue fixing clamping groove to form a base plate side waterproof rubber strip (20).
10. The ballastless track structure subgrade non-uniform settlement grouting repairing method according to claim 4 or 5, further comprising:
after grouting is completed, breaking off the rest grouting pipes through preset fracture (17) on the grouting pipes; then, the grouting pipe is plugged through the plugging blind holes arranged at the grouting holes (1201) of the base plate and the grouting holes (1301) of the track plate, and the plugging positions are polished after plugging is completed.
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