CN110670419A - Renovation method of waterproof and drainage structure of ballastless track subgrade - Google Patents

Abstract

The present application provides a remediation method for a waterproof and drainage structure of a ballastless track roadbed, comprising: cutting off a first closed layer and a first graded gravel layer in the area between the lines of the ballastless track; Dig a working well, push the drainage assembly horizontally into the bottom of the subgrade of the roadbed, and fill the gaps around the drainage assembly; set a water collecting well in the working well, and the drainage assembly is connected to the water collecting well, so that all the The liquid in the water collecting well is discharged to the outside of the ballastless track; concrete is poured on the surface of the subgrade of the roadbed in the area between the lines to avoid the water collecting well to form a second closed layer, and the height of the second closed layer is lower than the height of the support layer of the ballastless track; seal the caulking between the second sealing layer and the support layer. The technical problem of poor drainage effect existing in the existing ballastless track subgrade high-enclosed waterproof and drainage structure is solved.

Description

Renovation method of waterproof and drainage structure of ballastless track subgrade

technical field

The present application relates to the field of geotechnical engineering, and in particular, to a method for renovating a waterproof and drainage structure of a ballastless track roadbed.

Background technique

Referring to FIG. 1, the existing ballastless track 100' includes a support layer 110' and a track plate 120' located above the support layer 110'. The drainage structure includes: a first graded gravel layer 1' arranged above the foundation bed 200' in the area between the lines of the ballastless track 100' and a first closed layer 2' above the first graded gravel layer 1'. The height of a closed layer 2' is higher than the height of the track plate 120'. The height of the sealing layer 4' is higher than the height of the track plate 120'. With this design, the water in the area between the lines is laterally discharged from the upper surface of the first closed layer 2'. Due to the poor drainage effect, the normal operation of the high-speed rail is seriously affected, and the safe operation of the high-speed rail is brought about hidden dangers.

SUMMARY OF THE INVENTION

In view of this, the embodiments of the present application are expected to provide a method for renovating the waterproof and drainage structure of ballastless track subgrade, so as to solve the technical problem of poor drainage effect existing in the existing ballastless track subgrade high-enclosed waterproof and drainage structure. Technical problem, the technical solutions of the embodiments of the present application are implemented as follows:

The embodiment of the present application provides a method for renovating a waterproof and drainage structure of a ballastless track roadbed, including:

Chisel off the first sealing layer and the first graded gravel layer in the area between the ballastless tracks;

Excavate a work well in the area between the lines, push the drainage assembly into the subgrade bottom of the roadbed laterally, and fill the gap around the drainage assembly;

A water collecting well is arranged in the working well, and the drainage assembly is connected to the water collecting well, so as to discharge the liquid in the water collecting well out of the ballastless track;

A second closed layer is formed by pouring concrete on the subgrade surface of the subgrade avoiding the water collecting well in the area between the lines, and the height of the second closed layer is lower than the height of the support layer of the ballastless track;

The caulk between the second sealing layer and the support layer is sealed.

Further, the drainage assembly includes a casing and a drainage pipe sheathed in the casing.

Further, the side wall of the casing is provided with a slurry leakage hole.

Further, the steps of excavating a work well in the area between the lines, pushing the drainage assembly into the subgrade bottom of the roadbed laterally, and filling the gap around the drainage assembly, include:

A bracket is arranged between the sleeve and the drain to separate the sleeve and the drain;

Blocking the gap between the end of the casing and the bottom layer of the base bed to form a first blocking layer, and blocking the gap between the end of the drain pipe and the end of the casing to form a second blocking layer , opening a grouting hole and a vent hole on the first plugging layer or the second plugging layer;

The slurry is injected from the grouting hole until the slurry completely fills the gap around the drainage assembly, and the grouting hole and the exhaust hole are blocked.

Further, the bracket is arranged at intervals between the sleeve and the drain pipe;

And/or, the length of the sleeve is 40cm～60cm;

And/or, the grouting hole and the exhaust hole are opened on the first plugging layer or the second plugging layer away from the working well.

Further, pouring concrete on the surface layer of the subgrade of the subgrade avoiding the water collecting well in the area between the lines to form a second closed layer, the height of the second closed layer is lower than that of the support layer of the ballastless track. The step of height includes: reserving a water ditch in the area between the lines, and the water ditch communicates with the two adjacent water collecting wells.

Further, the water ditch has a longitudinal slope of 0.1% to 0.5%.

Further, the remediation method includes:

Chisel off the third closed layer and the second graded gravel layer of the road shoulder of the ballastless track;

Concrete is poured on the road shoulder to form the fourth closed layer, and the height of the fourth closed layer is lower than the height of the support layer.

Further, the fourth sealing layer has a transverse slope of 3% to 6%.

Further, the end of the second sealing layer close to the support layer is higher than the end of the second sealing layer close to the water ditch.

In the method for rectifying the waterproof and drainage structure of the ballastless track roadbed provided by the embodiment of the present application, a water collecting well is set in the area between the lines, and the drainage assembly is laterally pushed into the subgrade, so as to realize the drainage assembly without destroying the original ballastless track. The quick setting is convenient to quickly realize the renovation of the waterproof and drainage structure of the roadbed within the skylight time. Construct the ballastless track subgrade waterproof and drainage structure, collect the liquid in the ballastless track and surrounding areas to the water collecting well, and drain the liquid in the water collecting well to the outside of the ballastless track through the drainage component, so as to avoid the accumulation of liquid in the ballastless track , The drainage is rapid and the drainage effect is good. The second sealing layer prevents liquid from penetrating through the ground into the subgrade. Since the height of the second closed layer is lower than the height of the support layer of the ballastless track, it is convenient to timely find out whether there are any defects such as separation, white slurry and mud on the surface of the foundation bed at the junction of the support layer and the track slab, which is easy to control.

Description of drawings

Fig. 1 is the cross-sectional schematic diagram of the waterproof and drainage structure of ballastless track subgrade in the prior art;

2 is a flowchart of a method for rectifying a water-proof and drainage structure of a ballastless track roadbed in an embodiment of the application;

3 is a schematic cross-sectional view of a waterproof and drainage structure for a ballastless track roadbed in an embodiment of the application;

FIG. 4 is a cross-sectional view of the drainage assembly in the base layer of the embodiment of the application;

FIG. 5 is a flowchart of another method for rectifying the waterproof and drainage structure of a ballastless track subgrade in an embodiment of the present application.

Reference numerals: ballastless track 100; supporting layer 110; track plate 120; subgrade bottom layer 210; subgrade surface layer 220; drainage assembly 10; casing 11; drainage pipe 12; 30; water ditch 40; fourth sealing layer 50; working well 300; grouting hole 400;

Detailed ways

The present application will be described in further detail below with reference to the accompanying drawings and specific embodiments. In the description of this application, "area between lines" refers to the area between two lines of ballastless tracks, "cross slope" refers to the lateral slope of each component of the track width and roadside belt of the ballastless track, "longitudinal slope" "Slope" refers to the longitudinal slope of the extension direction of the ballastless track, and the "up" and "down" orientations or positional relationships are based on the normal use state of the ballastless track, such as the orientation or positional relationship shown in Figure 3, "cm" Refers to the SI unit of centimeters, it is to be understood that these orientation terms are used only to facilitate the description of the invention and to simplify the description and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operate in a particular orientation , so it should not be construed as a limitation of the present invention.

Please refer to FIG. 2 and FIG. 3 , an embodiment of the present application provides a method for renovating a waterproof and drainage structure of a ballastless track roadbed, including:

S01, chisel the first closed layer and the first graded gravel layer in the area between the ballastless tracks;

S02, excavate a work well in the area between the lines, push the drainage assembly into the bottom of the subgrade of the subgrade laterally, and fill the gap around the drainage assembly;

S03. A water collecting well is set in the working well, and the drainage component is connected to the water collecting well, so as to discharge the liquid in the water collecting well to the outside of the ballastless track;

S04, pouring concrete on the subgrade surface layer of the roadbed that avoids the water collecting well in the inter-line area to form a second closed layer, and the height of the second closed layer is lower than the height of the support layer of the ballastless track;

S05, sealing the caulking between the second sealing layer and the supporting layer.

In the prior art, the ballastless track adopts a high-enclosed drainage structure. Referring to FIG. 1 , there are frequent occurrences of mud pouring between the first closed layer 2' and the track plate 120', mortar precipitation between the track plate 120' and the support layer 110', and mortar layer. (not shown) serious diseases such as breakage and seam, it is often difficult to find the cause of the disease after such a disease occurs, so it is difficult to remediate. The ballastless track expansion joints and gaps are usually closed by the method of silicone caulking, and it is difficult to isolate the surface water infiltration. The reason is that the drainage of the high-enclosed drainage structure is not smooth, and the rainwater is easy to enter the first closed layer 2'. Since the height of the first closed layer 2' is higher than the height of the track plate 120', small diseases often occur in a short time. It could not be found through the line survey, which caused serious water accumulation in the first closed layer 2'. Under the shock and vibration of the train's high-speed load, the mud and mud between the first closed layer 2' and the track plate 120' gradually appeared, and the track plate 120' and the support Serious diseases such as mortar precipitation between the layers 110', damage to the mortar layer and separation, on the other hand, because the height of the first sealing layer 2' is too high, it is not easy to remediate the above-mentioned diseases.

In the embodiment of the present application, the first sealing layer 2' and the first graded gravel layer 1' of the existing ballastless track high-enclosed waterproof and drainage structure can be removed by using an electric pick or an air-compressor supporting air pick (see Fig. 1) For the thicker part of the first sealing layer 2', a cutting machine can be used to cut the thicker part into pieces and then transport it out of the line by a flatbed truck or a trolley.

Referring to FIG. 3 , a work well 300 is excavated in the area between the lines to facilitate subsequent construction operations. The drainage assembly 10 is laterally pushed into the subgrade bottom 210 of the subgrade. Specifically, the drainage assembly 10 is laterally pushed into the subgrade 210 from the working well 300 by using a micro pipe jacking device, or the drainage assembly 10 can be laterally pushed into the subgrade 210 by using a micro pipe jacking device. The assembly 10 is jacked into the base bed 210 from the side of the base bed 210 away from the interline area. The subgrade includes a subgrade surface layer 220 and a subgrade bed bottom layer 210. The subgrade bed surface layer 220 is subjected to a large dynamic stress generated by the train load. Disposing the drainage assembly 10 on the subgrade bed bottom layer 210 is conducive to maintaining the structural stability of the drainage assembly 10, and is also conducive to Maintain the structural stability of the roadbed. In addition, in some embodiments, the subgrade surface layer 220 includes graded crushed stone. In this case, since the graded crushed stone has greater strength, disposing the drainage assembly 10 on the base bed bottom layer 210 can prevent damage to the subgrade. On the basis of the original ballastless track 100 , the drainage assembly 10 is quickly installed into the bottom layer 210 of the subgrade, so as to quickly realize the improvement of the waterproof and drainage structure of the subgrade within the skylight time. Filling the gaps around the drainage assembly 10 , on the one hand, prevents the gaps around the drainage assembly 10 from becoming a circulation channel for groundwater and other liquids, and on the other hand plays a role in stabilizing the drainage assembly 10 .

A water collecting well 20 is arranged in the working well 300. The water collecting well 20 can be cast-in-place using a formwork containing steel bars, or it can be prefabricated. Using the prefabricated water collecting well 20 can save construction time. The communication between the drainage assembly 10 and the water collecting well 20 can be reserved for a water outlet (not shown) that communicates with the drainage assembly 10 during the manufacturing process of the water collecting well 20, or a water outlet can be opened on the water collecting well 10 after the water collecting well 20 is fabricated. The liquid in the water collecting well 20 is discharged from the drainage assembly 10 to the ballastless track 100 through the water outlet hole, so as to avoid the liquid volume remaining on the ballastless track 100 and affecting the safety of the ballastless track 100 .

The second sealing layer 30 is formed by pouring concrete on the subgrade surface layer 220 of the roadbed avoiding the water collecting well 20 in the area between the lines. The height of the second sealing layer 30 is lower than the height of the support layer 110 of the ballastless track 100 , so that the liquid in the ballastless track 100 is collected to the water collecting well 20 and discharged through the water collecting well 20 . Specifically, the second sealing layer 30 may be formed by pouring fiber concrete.

Sealing the caulking between the second sealing layer 30 and the supporting layer 110 includes: cleaning the caulking between the second sealing layer 30 and the supporting layer 110, and sticking antifouling tape on the adjacent area around the caulking. Anti-fouling tape, anti-fouling tape is used to prevent the interface agent and sealing material from contaminating the adjacent area around the junction, and the interface agent is painted on the surface of the caulking. Of course, the interface agent can also be used without the interface agent. To make the sealing material better achieve the sealing effect, fill the caulking with filler, and the filler is a material with waterproof sealing effect, such as silicone sealant or polyurethane sealant, to prevent liquid from entering the second sealing layer 30 from the caulking, supporting Layer 110 and/or subgrade, remove antifouling tape.

The regulation method of the waterproof and drainage structure of the ballastless track roadbed provided by the embodiment of the present application has the advantages of simple construction method, high construction efficiency, short construction period, and easy completion of construction within the skylight period. The formed waterproof and drainage structure of the ballastless track roadbed is constructed, and the liquid in the ballastless track 100 and the surrounding area is collected to the water collecting well 20, and the liquid in the water collecting well is discharged out of the ballastless track 100 through the drainage assembly 10, so as to avoid the liquid in the ballastless track 100. The ballast track 100 is accumulated, the drainage is rapid, and the drainage effect is good. The second sealing layer 30 prevents the liquid from infiltrating the roadbed through the surface, thereby avoiding the mud and mud between the first sealing layer and the track slab 120, and the mortar between the track slab 120 and the supporting layer 110. Serious diseases such as precipitation, mortar layer damage and separation. On the other hand, since the height of the second sealing layer 30 is lower than the height of the supporting layer 110 of the ballastless track 100, it is convenient to find out in time whether there is a seam, white slurry, and the surface layer of the foundation bed at the junction of the supporting layer 110 and the track slab 120. Diseases such as muddy water are easy to treat.

In an embodiment of the present application, please refer to FIG. 4 , the drainage assembly 10 includes a casing 11 and a drainage pipe 12 sheathed in the casing 11 . Since the drainage assembly 10 needs to be pushed into the bottom layer 210 of the base bed laterally, the casing 11 with stronger force capacity is first pushed into the bottom layer 210 of the base bed, and then the drainage pipe 12 for drainage is installed in the casing 11 . Specifically, a drill hole is drilled in the bottom layer 210 of the base bed through the drill pipe of the micro pipe jacking equipment, the casing 11 is detachably connected to the micro pipe jacking equipment, and the casing 11 is jacked into the drill using the micro pipe jacking equipment. Inside the hole, the casing 11 is separated from the micro-pipe jacking device, and the casing 11 is left in the borehole, so that the casing 11 is left in the bottom layer 210 of the substratum. The casing 11 can also be used to withstand the earth pressure, water pressure and road traffic load from the roadbed in the later stage, so as to maintain the structural strength of the drainage assembly 10 . In a specific embodiment, the casing 11 can be a metal pipe, such as a galvanized steel pipe, a copper pipe, etc., which has strong structural strength, which is not only convenient for bearing compressive stress and bending moment, but also convenient for pushing the casing 11 into the foundation laterally. Inside the bottom 210 of the bed. The drainage pipe 12 can be an organic polymer pipe such as a polyvinyl chloride pipe, a polyethylene pipe, a high-density polyethylene pipe, etc. The above-mentioned structure is cheap to manufacture and has a long service life.

In an embodiment of the present application, please refer to FIG. 4 , a slurry leakage hole (not shown) is formed on the side wall of the sleeve 11 . The slurry can enter the gap between the casing 11 and the subgrade bottom 210 and the gap between the casing 11 and the drainage pipe 12 through the slurry leakage hole at the same time, so as to avoid the gap between the casing 11 and the subgrade 210 becoming groundwater. The circulation channel can also reduce the grouting process and save the construction period.

In an embodiment of the present application, please refer to FIG. 2, S02, the steps of excavating a work well in the area between the lines, pushing the drainage assembly horizontally into the bottom layer of the subgrade of the roadbed, and filling the gaps around the drainage assembly, include:

A bracket is arranged between the casing and the drainage pipe to separate the casing and the drainage pipe;

The first sealing layer is formed by plugging the gap between the end of the casing and the bottom layer of the base bed, and the second sealing layer is formed by plugging the gap between the end of the drain pipe and the end of the casing. A grouting hole and a vent hole are provided on the second plugging layer;

The slurry is injected from the grouting hole until the slurry completely fills the gap around the drainage component, and the grouting hole and the exhaust hole are blocked.

In order to avoid the subsequent filling of the gap between the casing 11 and the drain pipe 12, the inner wall of the casing 11 and the outer wall of the drain pipe 12 stick together to affect the filling of the gap between the casing 11 and the drain pipe 12. A bracket 13 (refer to FIG. 4 ) is arranged between 11 and the drain pipe 12 to separate the casing 11 and the drain pipe 12 .

The first sealing layer (not shown) seals the gap between the end of the casing 11 and the bottom layer 210 of the base bed to prevent the gap between the end of the casing 11 and the bottom layer 210 of the base bed from being communicated with the atmosphere, and the second sealing layer The layer (not shown) seals the gap between the end of the drain pipe 12 and the end of the casing 11 to prevent the gap between the end of the drain pipe 12 and the end of the casing 11 from being connected to the atmosphere, which is convenient for rapid grouting and drainage. Slots around the perimeter of the assembly 10.

A high-pressure grouting pump is used to inject the slurry from the grouting hole 400. Since the side wall of the casing 11 has a slurry leakage hole, the slurry enters the gap between the drain pipe 12 and the casing 11 along the slurry leakage hole, and the casing 11 and the casing In the gap between the base layers 210, the gas or liquid in the gap around the drainage assembly 10 is discharged from the exhaust hole 500, and the slurry gradually fills the gap around the drainage assembly 10 from the slurry leakage hole until the slurry completely fills the drainage assembly 10. Around the gap, stop grouting. The grouting hole 400 and the exhaust hole 500 can be opened only on the first plugging layer or the second plugging layer, so as to quickly fill the gap around the drainage assembly 10 and improve the work efficiency. Specifically, a grouting hole 400 is opened in the first plugging layer, slurry is injected from the grouting hole 400, the slurry gradually fills the gap between the casing 11 and the base layer 210, and the slurry enters the drainage through the slurry leakage hole The gap between the pipe 12 and the casing 11 does not need to have grouting holes 400 on both the first plugging layer and the second plugging layer, so that the gap around the drainage assembly 10 can be completely filled. It can be understood that, a grouting hole 400 can also be opened in the second plugging layer, and the principle is the same as the above, which is not repeated here.

Blocking the grouting hole 400 and the exhaust hole 500, on the one hand, prevents the grouting hole 400 and the exhaust hole 500 from becoming a groundwater circulation channel, and on the other hand prevents the liquid from the outside from entering the roadbed through the grouting hole 400 and the exhaust hole 500 Inside.

It can be understood that, if the gap around the drainage assembly 10 is not full of grouting amount, a plurality of grouting holes 400 and exhaust holes 500 can be opened, and a plurality of grouting holes 400 or exhaust holes 500 can be opened. On the first plugging layer, both can be set on the second plugging layer, or can be set on the first plugging layer and the second plugging layer at the same time.

In one embodiment, please refer to FIG. 3 , in order to further facilitate grouting, a grouting hole 400 can also be opened on the subgrade surface layer 220 or the ballastless track 100 , and one end of the grouting hole 400 extends to the casing 11 and the subgrade. In the gap between the bottom layers 210, the high pressure grouting pump is used for grouting from the other end of the grouting hole 400, and the slurry gradually fills the gap between the casing 11 and the bottom layer 210 of the base bed, and then passes through the grouting hole to gradually fill the casing. 11 and the gap between the drain pipe 12.

In an embodiment of the present application, please refer to FIG. 4 , a bracket 13 is arranged between the casing 11 and the drain pipe 12 at intervals. Disposing the brackets 13 at intervals can better separate the casing 11 and the drain pipe 12 , and is also convenient to reduce the volume of the bracket 13 , and is convenient to be arranged between the casing 11 and the drainage pipe 12 .

In an embodiment of the present application, the distance between two adjacent brackets 13 is 15 cm˜30 cm. This design can minimize the number of brackets 13 used under the condition of ensuring better separation between the casing 11 and the drain pipe 12, so as to save costs.

In order to further facilitate construction on a ballastless track with a relatively narrow space, in an embodiment of the present application, please refer to FIG. 3 , the length of the sleeve 11 is 40cm-60cm. For example, 40cm, 45cm, 50cm, 55cm, 60cm. It can be understood that a plurality of sleeves 11 can be used in combination to form a pipeline whose length meets the requirement of the drainage distance. Exemplarily, multiple sleeves 11 may be connected back and forth to form a long drainage pipeline, and the connection between multiple sleeves 11 may be welded or screwed or connected by joints. In a specific embodiment, two adjacent sleeves 11 are welded. This design facilitates sealing the seam between the sleeves 11 and prevents water from seeping out at the seam between the two sleeves 11 . In another specific embodiment, two adjacent sleeves 11 are screwed together. It not only facilitates the positioning and connection between the two sleeves 11 , but also facilitates the improvement of the sealing performance between the two sleeves 11 . Specifically, one end of the sleeve 11 may have an external thread, and the other opposite end may have a matching internal thread. It can also be that the sleeve 11 includes a first sleeve 11 and a second sleeve 11 , both ends of the first sleeve 11 have internal threads, and both ends of the second sleeve 11 have internal threads adapted to the first sleeve 11 . External thread, the first sleeve 11 is screwed with the second sleeve 11 . In yet another specific embodiment, two adjacent sleeves 11 are connected by a joint. This design is convenient to further improve the sealing performance between the two sleeves 11 . Specifically, the joint may be an internal threaded joint or an external threaded joint or a clamp.

It should be noted that, when there are multiple casings 11, in a specific embodiment, the first casing 11 can be detachably connected to the micro pipe jacking device, and the first casing 11 can be jacked into the drill In the hole, further, the first casing 11 does not need to be completely pushed into the drill hole, but a certain length can be reserved outside the drill hole, such as a length of 5cm, of course, a length of 4cm, 6cm, etc. can also be reserved. . Weld or screw or connect the part of the first casing 11 outside the borehole with one end of the second casing 11, and then connect the other end of the second casing 11 to the micro pipe jacking equipment. Removably connect, push the second casing 11 into the drilled hole through a miniature pipe jacking device. Similarly, a certain length of the second casing 11 can be reserved outside the drilled hole, or 5 cm can be reserved. The part of the second casing 11 outside the borehole is used to connect with the third casing 11 . In this way, according to the depth of the borehole, a plurality of casings 11 can be pushed in in sequence through the above method.

In an embodiment of the present application, please refer to FIG. 3 , the grouting hole 400 and the exhaust hole 500 are formed on the first sealing layer or the second sealing layer far from the working well 300 . The grouting hole 400 is opened on the first plugging layer or the second plugging layer far away from the working well 300 , so that the high-pressure grouting pump can be used for grouting through the grouting hole 400 . On the plugging layer or the second plugging layer, when the exhaust hole 500 oozes out, it means that the surrounding gap of the drainage structure 10 has been filled with the slurry, which is convenient to observe the grouting situation.

In an embodiment of the present application, please refer to FIG. 2 and FIG. 3 , a second closed layer is formed by pouring concrete on the subgrade surface of the roadbed that avoids the water collecting well in the inter-line area, and the height of the second closed layer is lower than the supporting layer of the ballastless track The step of increasing the height includes: reserving a water ditch in the area between the lines, and the water ditch connects two adjacent water collecting wells. That is to say, when the second closed layer 30 is formed, a gutter formwork is placed, and then concrete is poured on the surface layer 220 of the foundation bed 220 to avoid the water collecting well 20 in the area between the lines to form the second closed layer 30, and the construction of the second closed layer 30 is completed. , remove the water ditch template, then the water ditch 40 is formed in the area between the lines, and the water ditch 40 is connected to the two adjacent water collecting wells 20, so that the liquid in the area between the lines enters the water collecting well 20 through the water ditch 40, and is discharged through the drainage assembly 10. Ballastless track 100. Specifically, the ditch formwork can use a pipe with a set radius, and the pipe can be fixed by a crimping connector.

In order to facilitate the liquid in the water ditch 40 to enter the water collecting well 20 , in an embodiment of the present application, please refer to FIG. 3 , the water ditch 40 has a longitudinal slope of 0.1% to 0.5%.

In an embodiment of the present application, please refer to FIG. 5 , the rectification method includes:

S06, chisel off the third closed layer and the second graded gravel layer of the shoulder of the ballastless track, pour concrete on the shoulder to form the fourth closed layer, and the height of the fourth closed layer is lower than the height of the support layer.

In the embodiment of the present application, please refer to FIG. 1, because the existing ballastless track 100' is provided with a second graded gravel layer 3' on the shoulder, and a third closed layer 4 is arranged above the second graded gravel layer' ', the height of the third closed layer 4' is higher than the height of the track plate 120'. Therefore, the third closed layer 4' and the second graded gravel layer 3' of the road shoulder of the existing ballastless track can be chiseled with an electric pick or an air-compressor supporting air pick, and the third closed layer 4' is thicker The thicker part can be cut out by cutting machine, and then it can be transported out of the line by a flatbed truck or a trolley. Concrete is poured on the road shoulder to form the fourth closed layer 50 (see FIG. 3 ). The height of the fourth closed layer 50 is lower than the height of the support layer 110 , so that the liquid collected on the shoulder of the ballastless track 100 can be collected from the top of the fourth closed layer 50 . The surface discharges the ballastless track 100 .

Specifically, the fourth sealing layer 50 may be formed by pouring fiber concrete.

It can be understood that step S06 can be implemented before any one of the above five steps S01, S02, S03, S04, S05, or can be implemented after any one of the above five steps S01, S02, S03, S04, S05.

In order to further facilitate the discharge of the liquid collected on the shoulder of the ballastless track 100 from the upper surface of the fourth sealing layer 50 to the outside of the ballastless track 100, in an embodiment of the present application, please refer to FIG. % of the cross slope.

In order to facilitate the liquid on the second sealing layer 30 to quickly enter the water collecting well 10 and/or the water ditch 40, in an embodiment of the present application, please refer to FIG. 3, the end of the second sealing layer 30 close to the supporting layer 110 is higher than the second sealing layer 30 Layer 30 is near one end of gutter 40 . Further, the gradient between the end of the second sealing layer 30 close to the support layer 110 and the end of the second sealing layer 30 close to the water ditch 40 is 3%-6%.

The above are only specific embodiments of the present application, but the protection scope of the present application is not limited to this. Covered within the scope of protection of this application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims (10)

1. A method for renovating a waterproof and drainage structure of a ballastless track subgrade is characterized by comprising the following steps:

chiseling a first closed layer and a first-stage crushed stone layer in the area between the ballastless track lines;

excavating a working well in the inter-line area, transversely jacking a drainage assembly into the bottom layer of the foundation bed of the roadbed, and filling gaps at the periphery of the drainage assembly;

arranging a water collecting well in the working well, wherein the drainage assembly is communicated with the water collecting well so as to drain liquid in the water collecting well out of the ballastless track;

pouring concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line area to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track;

sealing the caulk between the second closure layer and the support layer.

2. The method of remediating of claim 1, wherein the drain assembly comprises a casing and a drain tube nested within the casing.

3. The method of claim 2, wherein the sidewall of the casing is perforated with grout holes.

4. The method of claim 3, wherein the step of excavating a working well in the interline area to laterally push a drainage module into the bedding bed of the subgrade to fill the gaps around the drainage module comprises:

arranging a bracket between the sleeve and the drain pipe to separate the sleeve and the drain pipe;

plugging a gap between the end part of the sleeve and the bottom layer of the foundation bed to form a first plugging layer, plugging a gap between the end part of the drain pipe and the end part of the sleeve to form a second plugging layer, and forming a grouting hole and an exhaust hole on the first plugging layer or the second plugging layer;

and injecting slurry from the grouting holes until the slurry completely fills the gaps at the periphery of the drainage assembly, and blocking the grouting holes and the exhaust holes.

5. The method of remediating of claim 4, wherein the bracket is spaced between the casing and the drain pipe;

and/or the length of the sleeve is 40 cm-60 cm;

and/or the grouting hole and the exhaust hole are arranged on the first plugging layer or the second plugging layer far away from the working well.

6. The renovation method according to any one of the claims 1 to 5, characterized in that the step of casting concrete on the surface layer of the foundation bed of the roadbed avoiding the water collecting well in the inter-line areas to form a second closed layer, wherein the height of the second closed layer is lower than that of the supporting layer of the ballastless track comprises the following steps: and reserving a ditch in the inter-line area, wherein the ditch is communicated with two adjacent water collecting wells.

7. The method of claim 6, wherein the raceway is in a longitudinal slope of 0.1% to 0.5%.

8. The method of any one of claims 1 to 5, wherein the method comprises:

chiseling a third sealing layer and a second-stage crushed stone layer of a road shoulder of the ballastless track;

and pouring concrete on the road shoulder to form the fourth closed layer, wherein the height of the fourth closed layer is lower than that of the supporting layer.

9. The method of claim 8, wherein the fourth confinement layer has a cross slope of 3% to 6%.

10. The method of claim 6, wherein an end of the second sealing layer adjacent the support layer is higher than an end of the second sealing layer adjacent the gutter.

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