CN114657828A - High polymer grouting repair method for treating ballastless track foundation bed slurry pumping - Google Patents
High polymer grouting repair method for treating ballastless track foundation bed slurry pumping Download PDFInfo
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- CN114657828A CN114657828A CN202210566246.XA CN202210566246A CN114657828A CN 114657828 A CN114657828 A CN 114657828A CN 202210566246 A CN202210566246 A CN 202210566246A CN 114657828 A CN114657828 A CN 114657828A
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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
- E01B37/00—Making, maintaining, renewing, or taking-up the ballastway or the track, not provided for in a single one of groups E01B27/00 - E01B35/00
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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
- E01B2204/06—Height or lateral adjustment means or positioning means for slabs, sleepers or rails
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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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- 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
- E01B2204/11—Embedded tracks, using prefab elements or injecting or pouring a curable material
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Abstract
The invention discloses a high polymer grouting repairing method for treating ballastless track bed mudjacking and bleeding, which comprises the steps of extruding and discharging residual accumulated water and slurry in a bed surface layer of a mudjacking and bleeding disease area in a high-pressure grouting mode, fully filling pores in the bed surface layer and a void area at the bottom of a bed plate, improving the stress condition of the bed surface layer and slowing down the whip tip effect of a track structure under the action of train running load; and grouting the junction of the side edge of the base plate and the concrete sealing layer to plug the rainwater intrusion channel. After the high polymer grouting is finished, sealing glue is adopted to seal the expansion joint at the end part of the base plate and the crack at the side edge of the base plate respectively, and further blocking the rainwater invasion channel. The method enhances the supporting rigidity of the surface layer of the foundation bed in the damaged area, improves the stress characteristic of the track structure, and finally effectively blocks the rainwater invasion channel, thereby ensuring the long-term service performance of the repaired foundation bed and better treating the grout pumping damage of the foundation bed of the ballastless track of the high-speed railway.
Description
Technical Field
The invention relates to the technical field of geotechnical engineering, in particular to a high polymer grouting repair method for treating ballastless track bed slurry pumping, which is suitable for repairing slurry pumping diseases of ballastless track beds of high-speed railways.
Background
The slurry pumping of the railway subgrade is a common subgrade disease of a high-speed railway in China, occurs in both ballast and ballastless tracks, and is a long-standing disease of the railway subgrade. For the ballast track, as an early track structure, the related research on the slurry pumping disease of the ballast track is relatively comprehensive, and the structural characteristics, the bedding packing and the stress conditions of the ballastless track are different from those of the ballast track, so that the related theory of the ballast track is difficult to be directly applied to the ballastless track. As a novel track structure, the ballastless track roadbed structure has higher requirements on the material characteristics, the compaction degree and the fine particle content of the foundation bed filler, the foundation bed filler is basically selected nearby in the actual construction process, and the fine particle content is very easy to ignore in the material selection process. Meanwhile, the construction control and the construction quality are not controlled tightly in the construction process, and the foundation bed compaction degree is not compacted well, so that the supporting rigidity of the foundation bed is difficult to meet the design requirement, and the foundation bed structure is easy to settle under the action of the train operation load. The ballastless track bed plate is of a concrete structure, the rigidity of the ballastless track bed plate is large, the difference between the ballastless track bed plate and the supporting rigidity value of the underlying bed surface layer is large, the bed plate can rebound after the load of a train is unloaded, and then the bed plate is separated from the bed surface layer, a channel is provided for rainwater to invade the bed, and the rainwater invades the bed surface layer and continuously saturates the bed surface layer under the action of long-time rainfall. When the train load is loaded, the base plate is pressed to the lowest position, so that under the action of the circulating train load, the base plate can continuously flap the surface layer of the foundation bed, fine particles on the surface layer of the foundation bed and invaded rainwater are mixed to form slurry, and finally, the slurry is migrated to form slurry turning and mud pumping along with the dissipation of the excess pore pressure in the surface layer of the foundation bed. After the mud pumping occurs, the fine particles on the surface layer of the foundation bed are continuously sprayed out, the fine particles are lost and cause the bottom of the base plate to be empty, and further the vibration of the track structure is aggravated, and the operation safety of the train is seriously threatened even.
For a ballastless track structure with the occurrence of slurry pumping, residual stagnant water and slurry in the surface layer of a foundation bed are the main reasons for reducing the rigidity of the foundation bed, the reduction of the rigidity of the foundation bed further promotes the whip tip effect of the track structure to be intensified, and obviously the slurry pumping of the foundation bed and the whip tip effect of the track structure are processes for mutually promoting deterioration. Therefore, residual accumulated water and slurry in the surface layer of the foundation bed are discharged, the weakened foundation bed surface layer support rigidity is improved to slow down the track structure whip tip effect, and the method is the key for repairing the ballastless track foundation bed slurry pumping. The existing method for treating the slurry pumping of the ballastless track foundation bed mostly adopts shallow low-pressure grouting, the diffusion radius of slurry materials in the method is limited, residual stagnant water and slurry in the surface layer of the foundation bed cannot be fully squeezed out, a void area at the bottom of a base plate cannot be fully filled, and particularly, a rainwater invasion channel is not blocked after grouting repair is completed, so that rainwater can still invade the surface layer of the foundation bed, secondary slurry pumping occurs in the repaired foundation bed within the month, the long-term service performance is poor, and therefore, the dredging measure of shallow grouting repair cannot effectively prevent the expansion of the slurry pumping. Therefore, the conventional grouting repairing method is difficult to radically treat the slurry-turning mud-emitting disease, and a more optimized high polymer grouting mode needs to be further explored to treat the slurry-turning mud-emitting disease of the ballastless track bed.
Disclosure of Invention
Aiming at the defects, the invention provides a high polymer grouting repairing method for treating ballastless track bed grout pumping, the high polymer grouting repairing method has good fluidity and diffusivity, is not sensitive to water, and adopts a deep high-pressure mode for grouting, a grouting hole is deeply drilled to the bottom of the surface layer of the bed, and grouting materials are injected into the surface layer of the bed along the grouting hole with the angle of 45 degrees so as to obtain a larger grouting reinforcement area. The method can extrude and discharge residual accumulated water and slurry in the surface layer of the foundation bed in the disease area, and simultaneously, the grouting material can effectively fill a void area between the base plate and the surface layer of the foundation bed, so that the surface layer of the foundation bed in the disease area can be integrally reinforced, and the influence of the whip effect of the track structure under the action of train load can be relieved. After the deep grouting is finished, the side gaps are subjected to grouting plugging along the two sides of the base plate, and meanwhile, the expansion joint and the side gaps of the base plate are plugged by adopting sealant, so that rainwater is prevented from invading the foundation bed again, and the long-term normal service performance of the foundation bed after the high polymer is repaired is enhanced.
The technical scheme adopted by the invention for solving the technical problem is as follows: the embodiment of the invention provides a high polymer grouting repair method for treating ballastless track bed slurry pumping, which specifically comprises the following steps:
1) dividing an influence area of high-speed railway ballastless track foundation bed mud pumping into a main influence area of mud pumping and a general influence area, and then arranging a plurality of first-wheel grouting holes, second-wheel grouting holes and third-wheel grouting holes aiming at different areas; meanwhile, a plurality of side sealing grouting holes are distributed at the junction of the base plate and the concrete sealing layer;
2) drilling the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole to the bottom of the surface layer of the foundation bed at an alpha angle of 40-50 degrees, and vertically drilling the side edge sealing grouting holes to 5-8 cm below the bottom surface of the base plate; and put into the corresponding grouting pipe;
3) performing high-pressure grouting on the surface layer of the foundation bed in a main grouting and mud pumping influence area through a first round of grouting pipes and a second round of grouting pipes; performing high-pressure grouting on the surface layer of the foundation bed in a region generally influenced by slurry pumping through a third grouting pipe; performing low-pressure grouting on the junction of the side edge of the base plate and the concrete sealing layer through a side edge sealing grouting pipe;
4) cleaning residues in all grouting pipes and grouting orifices;
5) and sealing the expansion joint at the end part of the base plate, the side edge of the base plate and the junction of the concrete sealing layer by adopting a sealant.
Further, the method further comprises: and after the sealing work is finished, cleaning residues in the grouting and sealing processes.
Furthermore, the specific steps of arranging a plurality of first wheel grouting holes, second wheel grouting holes and third wheel grouting holes for different areas are as follows: around the expansion joint between adjacent base plates, the first wheel grouting holes are mainly distributed on the concrete sealing layer close to the two sides of the base plate and cover the main influence area of slurry turning and mud pumping; the second wheel grouting holes are respectively arranged at two sides of the base plate and the track plate and cover the main influence area of slurry turning and mud pumping; the third wheel grouting hole is arranged on the base plate and covers the area generally affected by slurry pumping.
Furthermore, the aperture of the side sealing grouting hole of each of the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole is 60 mm, and the depth of each of the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole in the vertical direction is 45 cm.
Further, in the step 3), firstly, the first round of grouting is performed with high-pressure grouting symmetrically and synchronously from the position far away from the expansion joint to the position of the expansion joint by the first round of grouting pipes according to the arrangement of the first round of grouting holes to form a waterproof curtain, and the expansion joint at the end part of the base plate is used as a water and mud discharge channel; then, performing high-pressure grouting symmetrically and synchronously on the second round of grouting pipes from the position far away from the expansion joint to the position of the expansion joint by the second round of grouting; then, the third wheel of grouting symmetrically and synchronously carries out high-pressure grouting on the third wheel of grouting pipe from the position of the expansion joint to the position far away from the expansion joint; and finally, symmetrically and synchronously performing low-pressure grouting on the junction of the side edge of the base plate and the concrete sealing layer from the position of the expansion joint to the position far away from the expansion joint through the side edge sealing grouting pipe so as to avoid causing the lifting of the track structure.
Further, the process of forming the waterproof curtain specifically comprises the following steps: the first round of grouting forms high polymer water-blocking barriers on two sides and two cross sections, and the foundation layer with lower permeability is used as a natural water-blocking barrier, so that a water-stopping curtain consisting of five water-blocking barriers is formed.
Further, the second round of grouting is used for squeezing out residual accumulated water and slurry in the surface layer of the foundation bed and fully filling the pores in the surface layer of the foundation bed and the void area at the bottom of the base plate.
Further, the grouting pressure of high-pressure grouting in the step 3) is 3.0 MPa, and the grouting pressure of low-pressure grouting is 0.3 MPa.
Further, the control accuracy of the grouting pressure was 0.01 MPa.
Further, step 5) seals the expansion joint of bed plate tip, bed plate side and concrete seal coat juncture, forms respectively with the expansion joint sealing strip that is 5~10% along the cross section direction slope, with the bed plate side sealing strip that is 35 ~ 40% along the cross section direction slope.
The invention has the following beneficial effects:
1) the method comprises the steps of injecting a water-insensitive high polymer grouting material into the surface layer of the foundation bed affected by rainwater erosion and slurry pumping, extruding and discharging residual accumulated water and slurry in the surface layer of the foundation bed, filling pores in the surface layer of the foundation bed and a void area at the bottom of the base plate, reinforcing the weakened surface layer of the foundation bed, enhancing the supporting rigidity of the surface layer of the foundation bed, improving the stress condition of the surface layer of the foundation bed at the position of an expansion joint at the end part of the base plate (a weak link of a track structure), reducing the whip tip effect of the track structure under the action of train running load and the flapping action of the base plate on the foundation bed caused by the whip tip effect, and avoiding slurry pumping of the foundation bed. The injection mode and depth of the grouting hole are important steps, the grouting hole is drilled to the bottom of the surface layer of the foundation bed at an angle of 45 degrees to obtain a large grouting area, the depth of the grouting hole along the vertical direction is about 45 cm, residual accumulated water and slurry in the whole range of the surface layer of the foundation bed can be squeezed out, and the hole of the surface layer of the foundation bed and a void area at the bottom of the base plate are filled.
2) The distribution and the grouting sequence of grouting holes in the grouting process of the grout-rising damaged area are important steps, and the distribution of the grouting holes is dense in the severe grout-rising area (within the range of 2 m from the left to the right of the expansion joint of the longitudinal base plate along the line); for the common mud pumping area, the distance between grouting holes can be increased. The grouting process is divided into 3 times of grouting, and after the first time of grouting is finished, a waterproof curtain surrounding a mud pumping disease area is formed; the second round of grouting is carried out from the position (namely the position of the expansion joint) which is less influenced by the slurry pumping-out (namely the position which is longitudinally far away from the expansion joint along the line) and is gradually influenced by the slurry pumping-out, and accumulated water and slurry remained in the surface layer of the foundation bed are squeezed and discharged; and the third grouting is auxiliary grouting, and mainly comprises grouting in a general grout-turning and mud-pumping area and reinforcing the surface layer of the foundation bed with weakened supporting rigidity. The grouting sequence of the damaged area is sequentially carried out according to the first, second and third rounds, the grouting of the damaged area is carried out in a high-pressure grouting mode, the grouting pressure is 3.0 MPa, and the surface layer of the foundation bed affected by the slurry pumping of the damaged area can be effectively filled and reinforced.
3) And after grouting in the damaged area is completed, grouting and plugging are performed on the junction of the side edge of the base plate and the concrete sealing layer, and rainwater invasion into the channel is eliminated. The side sealing grouting adopts low-pressure grouting, the grouting pressure is 0.3 MPa, and the lifting effect on the upper track structure is avoided while the possible gap on the side of the base plate is blocked. And after grouting in the grout-rising damaged area and sealing and grouting on the side edge of the base plate are finished, removing the residual part of the grouting pipe, sealing the grouting hole, and removing residual grout at the hole opening of the grouting hole. Then the special sealant for the railway is adopted to seal the expansion joint of the base plate, the side edge of the base plate and the junction of the concrete sealing layer, and the formed sealing strip forms a drainage slope with a certain angle along the cross section direction, so that the accumulation of rainwater on the surface of the sealing strip under the long-term rainfall condition is avoided.
4) The high polymer grouting material adopted by the method has the characteristics of good fluidity, high strength, short strength forming time, static (dynamic) rigidity which is not much different from the surface layer of the bed, temperature resistance, durability and the like, and meanwhile, the grouting material is insensitive to water in the diffusion and compaction processes in the surface layer of the bed, can keep the response density and strength while effectively discharging residual water in the surface layer of the bed, and the density retention rate is more than 75 percent to ensure the strength of the high polymer grouting material and better support the load generated in the running process of a train. And meanwhile, grouting materials are filled in a void area at the bottom of the base plate caused by slurry pumping, so that the stress condition of the roadbed is improved, the whip tip effect of the track structure under the action of train running load and the beating action of the base plate on the foundation bed caused by the track structure are reduced, and the slurry pumping of the foundation bed is avoided. After grouting repair of the damaged area is completed, a possible rainwater invasion channel is effectively blocked by grouting and sealing, so that rainwater is prevented from invading the roadbed after high polymer repair, long-term normal serviceability of the roadbed after high polymer repair is ensured, railway roadbed maintenance cost is reduced, and the service life of the railway roadbed is prolonged.
Drawings
FIG. 1 is a plan view showing the distribution of grouting holes in a grout-turning and mud-pumping damaged area and sealing grouting holes on the side edge of a base plate;
FIG. 2 is an A-A cross sectional view of grouting holes in a grout-pouring damaged area and sealing grouting holes at the side edges of a base plate;
FIG. 3 is a B-B cross sectional view of grouting holes in a grout-pouring damaged area and sealing grouting holes on the side edge of a base plate;
FIG. 4 is a top view of the expansion joint and the joint between the side of the base plate and the concrete sealing layer;
FIG. 5 is a cross sectional view of the expansion joint and the sealing at the junction between the side edge of the base plate and the concrete sealing layer;
in the figure: the steel rail and fastener system comprises a steel rail and fastener system 1, a rail plate 2, a base plate 3, a concrete sealing layer 4, a foundation bed surface layer 5, a foundation bed bottom layer 6, an expansion joint 7, a first wheel grouting pipe 8, a second wheel grouting pipe 9, a third wheel grouting pipe 10, a base plate side sealing grouting pipe 11, an expansion joint sealing strip 12 and a base plate side sealing strip 13.
Detailed Description
The present invention will be further described with reference to examples and drawings, and features in the following examples and embodiments may be combined with each other without conflict.
As shown in fig. 1, the ballastless track structure of the current high-speed railway basically comprises, from top to bottom, a steel rail and fastener system 1, a track slab 2, a bed slab 3, a bed surface layer 5 and a bed bottom layer 6, wherein a cement-emulsified asphalt mortar layer is arranged between the rigid track slab 2 and the bed slab 3 as a buffer layer, and the bed surface layer of the shoulder part of the railway outside the range of the bed slab is covered with a concrete sealing layer 4 with a gradient of 4%, so as to facilitate surface drainage of the track structure. In order to prevent the base plates from expanding under high temperature, 2 cm expansion joints 7 are arranged between adjacent base plates, the centers of the expansion joints are filled with foam rubber plates or plastic plates, and asphalt paste is used for sealing to prevent rainwater from invading the base bed. In the process of constructing the slab ballastless track railway road, the material of the bedding packing, the compaction quality of the road bed and the like cannot meet the design standard of the high-speed railway road bed due to the reasons that the construction control and the construction quality are not tight. In addition, because of the large difference in the stiffness of the foundation bed and the overlying concrete slab, the dynamic response of the track structure under train operating loads exhibits a whip effect which causes a break between the bed plate and the surface of the foundation bed, which break provides a path for rain water to penetrate into the foundation bed. Meanwhile, in the long-term operation process of the railway line, under the coupling action of complex natural operation force (such as high-temperature solarization and strong rainfall action) and train dynamic circulation load, the filling material at the position of the expansion joint gradually ages and loses efficacy, a through crack is formed, and a rainwater invasion channel is provided. Under the action of long-term rainfall, rainwater enters the foundation bed through the channels, and due to the low permeability of the bottom layer of the foundation bed, the rainwater entering the foundation bed is accumulated on the surface layer of the foundation bed and continuously saturates the surface layer of the foundation bed. Under the action of train running load, the saturated surface layer of the foundation bed generates super-pore water pressure and forms a pore pressure gradient from bottom to top, so that fine particles in the surface layer of the foundation bed are moved upwards and accumulated, the accumulated fine particles are turned over along with the dissipation of the super-pore pressure of the surface layer of the foundation bed, slurry and sludge are formed, and the turned-over fine particles are accumulated around the expansion joint. Along with the deterioration of the mud pumping disease, the fine particle loss in the surface layer of the foundation bed is further aggravated, so that the bottom of the foundation bed is hollowed, the vibration of the track structure is aggravated, and the development of the whip tip effect is promoted, therefore, the whip tip effect and the mud pumping disease are mutually promoted and aggravated processes, and the railway transportation safety is seriously influenced.
Therefore, the invention provides a high polymer grouting repairing method for treating ballastless track bed slurry pumping, which can effectively weaken the whip tip effect while repairing slurry pumping, and specifically comprises the following steps:
1) dividing the influence area of the high-speed railway ballastless track foundation bed mud pumping into a main mud pumping influence area and a general influence area, formulating the distribution scheme of the grouting holes, and arranging a first round of grouting holes, a second round of grouting holes and a third round of grouting holes according to different areas. Meanwhile, side sealing grouting holes at the junction of the base plate (3) and the concrete sealing layer (4) are arranged.
Specifically, the slurry pumping occurs at the position of the expansion joint 7 of the base plate, and then gradually expands towards two sides, wherein the expansion range is within 5 m (2.5 m on each of the left side and the right side). The serious influence area of the slurry pumping is basically concentrated within the range of 2.5 m along the length of two sides of the line by taking the expansion joint 7 as the center, the serious influence area of the slurry pumping can exceed the range under rare conditions, and the rest areas along the line are used as the general influence area of the slurry pumping. As shown in fig. 1, around the expansion joint 7, the first wheel grouting holes are mainly arranged on the concrete sealing layer 4 close to the two sides of the base plate 3, and cover the main influence area of slurry turning and mud pumping; correspondingly, the second wheel grouting holes are respectively arranged at two sides of the base plate 3 and the track plate 2; and for the area generally affected by mud pumping during slurry turning, a third wheel of grouting holes are distributed on the base plate.
The sealed slip casting hole of side of bed plate 3 lays in 3 both sides of bed plate, specifically lies in bed plate and concrete seal layer juncture.
Further, the distance between adjacent grouting holes is the distance between ballastless track fasteners (about 0.63 m).
It should be noted that, for the case that the very few grouting areas extend beyond the above range, the first round of grouting holes and the second round of grouting holes need to be arranged according to the actual situation of field grouting damage investigation, and the main affected area of the grouting damage needs to be covered by the first round of grouting holes and the second round of grouting holes.
2) Drilling the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole to the bottom of the surface layer of the foundation bed at an angle of 45 degrees respectively, and vertically drilling the side sealing grouting holes to a position 5-8 cm below the bottom surface of the base plate; and put into the corresponding grouting pipe.
Specifically, after grouting hole arrangement is completed, drilling is carried out according to a set grouting hole arrangement scheme under the reasonable cooperation of road bureau workers and professional drilling personnel, a drilling machine drills to the bottom surface of the surface layer of a foundation bed at an alpha angle which is 40-50 degrees, and in the embodiment of the invention, the alpha = 45 degrees so as to obtain a larger grouting area. The aperture of each grouting hole is about 60 mm, and the depth of each grouting hole in the vertical direction is 45 cm. And after drilling, placing corresponding grouting pipes in the first, second and third grouting holes respectively. As shown in the cross-sectional view of fig. 2, the relative positions of the first wheel grouting pipe 8 and the second wheel grouting pipe 9 in the cross-sectional direction are shown; FIG. 3 is a cross-sectional view showing the relative positions of the third wheel of grouting pipes 10 in the cross-sectional direction, and the distribution of the base plate side sealing grouting pipes 11.
3) Performing high-pressure grouting on the surface layer of the foundation bed in a main grouting and mud pumping influence area through a first round of grouting pipes and a second round of grouting pipes; performing high-pressure grouting on the surface layer of the foundation bed in a region generally influenced by slurry pumping through a third grouting pipe; and performing low-pressure grouting on the junction of the side edge of the base plate and the concrete sealing layer through the side edge sealing grouting pipe.
And (3) performing high-pressure grouting on the surface layer of the foundation bed in a main influence area of slurry pumping through the first round of grouting pipes and the second round of grouting pipes, wherein the grouting pressure is 3.0 MPa. Firstly, high-pressure grouting is carried out on a first wheel grouting pipe 8 according to the arrangement of first wheel grouting holes, four grouting devices are adopted to carry out synchronous grouting respectively at symmetrical positions (two sides of a base plate and the front and the back of an expansion joint), the grouting direction is the direction of an arrow in the top view of the drawing 1, namely the direction from the position far away from the expansion joint to the position of the expansion joint along the longitudinal direction of a line, high polymer water-blocking barriers of two side surfaces and two cross sections can be formed through the first wheel grouting, in addition, a foundation bed bottom layer 6 with low permeability can be used as a natural water-blocking barrier, so that a water-stopping curtain consisting of five water-blocking barriers is formed, and the end part of the ballastless track base plate is used as a discharge port of disease water and slurry. And after the waterproof curtain is formed, the second round of grouting is started, the symmetric synchronous grouting mode is also adopted in the grouting mode, the grouting direction is the direction of an arrow in the plan view of the figure 1, residual accumulated water and slurry in the surface layer 5 of the foundation bed can be squeezed out through the second round of grouting, and the pores in the surface layer 5 of the foundation bed and the void area at the bottom of the foundation plate 3 are fully filled. And the third round of grouting starts along two sides of the base plate 3 to cover the area generally affected by slurry pouring and mud pumping, and the grouting direction is the reverse direction indicated by arrows in the plan view of fig. 1.
And after the third round of grouting is finished, immediately performing side sealing grouting on the base plate 3, starting grouting from the position of the expansion joint 7 in the grouting direction, and gradually grouting towards two sides (namely the direction opposite to the arrow in the top view of fig. 1), wherein the grouting in the third round is low-pressure grouting, the grouting pressure is 0.3 MPa, and the lifting of the track structure is avoided.
In the embodiment of the invention, the grouting material is a high polymer grouting material, has good fluidity, high strength, short strength forming time, static (dynamic) rigidity which is not much different from the surface layer of the bed, temperature resistance and durability, is insensitive to water in the diffusion and compaction processes of the grouting material in the surface layer of the bed, can effectively discharge residual water in the surface layer of the bed and simultaneously maintain the response density and strength, and has the density retention rate of more than 75 percent to ensure the strength of the high polymer grouting material and better support the load generated in the running process of a train. For example, polyurethane materials, have good flow and diffusion properties and are not sensitive to water.
It should be noted that, the control precision of the grouting pressure in the grouting process is 0.01 MPa, which can better ensure that the elevation of the track structure is restored to the original elevation in the grouting process.
By adopting the method of the invention, residual accumulated water and slurry in the surface layer of the foundation bed in the damaged area can be extruded and discharged, and meanwhile, the grouting material can effectively fill the void area between the base plate and the surface layer of the foundation bed, thus realizing the integral reinforcement of the surface layer of the foundation bed in the damaged area and relieving the influence of the whip tip effect of the track structure under the load action of the train.
4) And after the grouting is finished, removing the residual grouting pipe and grouting residues.
5) Adopt sealed glue to seal up the expansion joint, the bed plate side and the concrete seal layer juncture of bed plate tip.
Specifically, the sealant is a special sealant for a ballastless track, and the sealant adopted in the embodiment of the invention is silicon carbide-1168.
And then, sealing off the expansion joint 7 and a possible crack on the side edge of the base plate 3 by adopting special sealant for the ballastless track, as shown in fig. 4 and 5. When the expansion joint 7 is plugged, the bottom of the sealant is padded by adopting a light foam material, and the formed expansion joint sealing strip 12 with the gradient of 5-10% is arranged along the cross section direction so as to facilitate drainage; the base plate side sealing strip 13 formed when a possible crack on the side of the base plate 3 is blocked also needs to be provided with a 35-40% slope along the cross section direction as a drainage slope, so that rainwater is prevented from accumulating near the base plate side sealing strip 13, as shown in fig. 5. Before the plugging operation is started, the position to be plugged needs to be polished and ash-removed, so that good bonding performance between the sealing strip and concrete is ensured; meanwhile, the art designing adhesive tape is stuck to the area outside the sealing strip, and the art designing adhesive tape is removed after the plugging operation is finished, so that the attractiveness of the sealing strip is ensured. After sealing and plugging, rainwater can be prevented from invading the foundation bed again, and the long-term normal service of the foundation bed after high polymer restoration is enhanced.
6) And (4) cleaning residues in the sealing process after the plugging operation is finished, and finally checking all operation tools and grouting in a line operation area and residues in the sealing process to ensure that the high-speed railway ballastless track subgrade is restored to the initial state.
In conclusion, the method disclosed by the invention adopts a deep high-pressure mode for grouting for many times, the grouting holes are drilled to the bottom of the surface layer of the foundation bed deeply, and the grouting materials are injected into the surface layer of the foundation bed along the grouting holes with the angle of 45 degrees to obtain a larger grouting reinforcement area. After the deep grouting is finished, the side gaps are subjected to grouting plugging along the two sides of the base plate, and meanwhile, the expansion joint and the side gaps of the base plate are plugged by adopting sealant, so that rainwater is prevented from invading the foundation bed again, and the long-term normal service performance of the foundation bed after the high polymer is repaired is enhanced.
The above embodiments are only used for illustrating the design idea and features of the present invention, and the purpose of the present invention is to enable those skilled in the art to understand the content of the present invention and implement the present invention accordingly, and the protection scope of the present invention is not limited to the above embodiments. Therefore, all equivalent changes or modifications based on the principles and design concepts disclosed herein are intended to be included within the scope of the present invention.
Claims (10)
1. A high polymer grouting repairing method for treating ballastless track bed slurry pumping is characterized by comprising the following steps:
1) dividing an influence area of high-speed railway ballastless track foundation bed mud pumping into a main influence area of mud pumping and a general influence area, and then arranging a plurality of first-wheel grouting holes, second-wheel grouting holes and third-wheel grouting holes aiming at different areas; meanwhile, a plurality of side sealing grouting holes are arranged at the junction of the base plate and the concrete sealing layer;
2) drilling the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole to the bottom of the surface layer of the foundation bed at an alpha angle of 40-50 degrees, and vertically drilling the side edge sealing grouting holes to 5-8 cm below the bottom surface of the base plate; and put into the corresponding grouting pipe;
3) performing high-pressure grouting on the surface layer of the foundation bed in a main grouting and mud pumping influence area through a first round of grouting pipes and a second round of grouting pipes; performing high-pressure grouting on the surface layer of the foundation bed in a region generally influenced by slurry pumping through a third grouting pipe; performing low-pressure grouting on the junction of the side edge of the base plate and the concrete sealing layer through a side edge sealing grouting pipe;
4) cleaning residues in all grouting pipes and grouting orifices;
5) and sealing the expansion joint at the end part of the base plate, the side edge of the base plate and the junction of the concrete sealing layer by adopting a sealant.
2. The polymer grouting repair method for treating ballastless track bed mudjacking according to claim 1, further comprising: and after the sealing work is finished, cleaning residues in the grouting and sealing processes.
3. The high polymer grouting repairing method for treating ballastless track foundation bed mudjacking according to claim 1, wherein the step of arranging a plurality of first wheel grouting holes, second wheel grouting holes and third wheel grouting holes for different areas specifically comprises: around the expansion joint between adjacent base plates, the first wheel grouting holes are mainly distributed on the concrete sealing layer close to the two sides of the base plate and cover the main influence area of slurry turning and mud pumping; the second wheel grouting holes are respectively arranged at two sides of the base plate and the track plate and cover the main influence area of slurry turning and mud pumping; the third wheel grouting hole is arranged on the base plate and covers the area generally affected by slurry pumping.
4. The high polymer grouting repair method for treating ballastless track foundation bed mudjacking according to claim 1, wherein the hole diameters of the side sealing grouting holes of the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole are all 60 mm, and the depths of the first wheel grouting hole, the second wheel grouting hole and the third wheel grouting hole in the vertical direction are 45 cm.
5. The high polymer grouting repair method for treating ballastless track foundation bed grouting bleeding according to claim 1, wherein in the step 3), first, high-pressure grouting is symmetrically and synchronously performed on the first round of grouting pipes from a position far away from the expansion joint to the position of the expansion joint according to the arrangement of the first round of grouting holes to form a waterproof curtain, and the expansion joint at the end part of the base plate is used as a water and mud discharge channel; then, performing high-pressure grouting symmetrically and synchronously on the second round of grouting pipes from the position far away from the expansion joint to the position of the expansion joint by the second round of grouting; then, the third wheel of grouting symmetrically and synchronously carries out high-pressure grouting on the third wheel of grouting pipe from the position of the expansion joint to the position far away from the expansion joint; and finally, symmetrically and synchronously performing low-pressure grouting on the junction of the side edge of the base plate and the concrete sealing layer from the position of the expansion joint to the position far away from the expansion joint through the side edge sealing grouting pipe so as to avoid causing the lifting of the track structure.
6. The high polymer grouting repair method for treating ballastless track bed slurry pumping according to claim 5, wherein the process of forming the waterproof curtain specifically comprises: the first round of grouting forms high polymer water-blocking barriers on two sides and two cross sections, and the bottom layer of the foundation bed is used as a natural water-blocking barrier, so that a water-stopping curtain consisting of five water-blocking barriers is formed.
7. The polymer grouting repairing method for governing ballastless track bed mudjacking according to claim 5, wherein the second round of grouting is used for squeezing out residual ponding and mud in the bed surface layer and fully filling the pores in the bed surface layer and the void area at the bottom of the bed plate.
8. The method for repairing high polymer grouting for treating ballastless track foundation bed grouting bleeding according to claim 1 or 5, wherein in the step 3), the grouting pressure of high-pressure grouting is 3.0 MPa, and the grouting pressure of low-pressure grouting is 0.3 MPa.
9. The high polymer grouting repair method for treating ballastless track bed slurry pumping according to claim 1 or 5, wherein the control precision of the grouting pressure is 0.01 MPa.
10. The polymer grouting repairing method for treating ballastless track foundation bed grouting and mud pumping according to claim 1, wherein in the step 5), the expansion joint at the end part of the base plate, the junction of the side edge of the base plate and the concrete sealing layer are sealed, and an expansion joint sealing strip with a gradient of 5-10% along the cross section direction and a base plate side sealing strip with a gradient of 35-40% along the cross section direction are respectively formed.
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| CN116163170A (en) * | 2022-12-22 | 2023-05-26 | 浙江大学 | Polyurethane grouting repairing method for ballastless track slurry-casting mud-bleeding disease |
| CN117248401A (en) * | 2023-09-21 | 2023-12-19 | 浙江大学 | Grouting repair process for slurry-casting mud-bubbling disease of plate-type ballastless track foundation bed |
| CN117569122A (en) * | 2024-01-15 | 2024-02-20 | 浙江大学 | Non-uniform settlement grouting repairing method for ballastless track structure roadbed |
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| CN117569122A (en) * | 2024-01-15 | 2024-02-20 | 浙江大学 | Non-uniform settlement grouting repairing method for ballastless track structure roadbed |
| CN117569122B (en) * | 2024-01-15 | 2024-06-11 | 浙江大学 | Non-uniform settlement grouting repairing method for ballastless track structure roadbed |
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