Ballastless track structure and construction method thereof

Abstract

The application provides a ballastless track structure and a construction method thereof, which is used in a U-shaped groove section of a tunnel portal and comprises a track bed plate, a steel rail, a sleeper, a fastener and a stand, the track bed plate near the portal side of the tunnel is provided with a first longitudinal drainage ditch, a transverse water intercepting ditch is formed between two adjacent track bed plates along the longitudinal direction of the track, the first longitudinal drainage ditch is communicated with the transverse water intercepting ditch to drain water to a rainwater pump house on the portal side of the tunnel, the stand is arranged in the transverse water intercepting ditch, the number of the sleepers and the fasteners is multiple respectively, the top end of the stand and the track bed plate are respectively provided with the sleepers, the fasteners are correspondingly arranged on each sleeper, and the steel rail is arranged on the sleepers through the fasteners. The ballastless track structure does not change the distance between the fasteners due to the arrangement of the transverse water intercepting ditch, the stability of the track is ensured, the effect of the transverse water intercepting ditch is not affected, and the drainage efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of urban rail transit, in particular to a ballastless track structure and a construction method thereof. BACKGROUND

[0002] In the field of urban rail transit, a U-shaped groove section is usually arranged at a tunnel portal to connect a ground line and an underground line. When it rains, rainwater will flow into the underground tunnel along the longitudinal slope of the U-shaped groove section. In order to prevent rainwater from flowing into the underground tunnel, a water retaining design is needed at the U-shaped groove section, and a rainwater pump house is arranged on the side of the line to collect and discharge rainwater from the ground. When the amount of rainwater is large, the longitudinal slope drainage alone cannot ensure that the rainwater is discharged in time. SUMMARY

[0003] The present application provides a ballastless track structure and a construction method thereof to solve the technical problem that the track line drainage alone cannot meet the needs in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme of the present application is as follows:

[0005] The present application provides a ballastless track structure for a U-shaped groove section at a tunnel portal, comprising a track bed plate, a rail, a sleeper, a fastener and a column, the track bed plate on the side of the tunnel portal has a first longitudinal drainage ditch, a transverse water intercepting ditch is formed between two adjacent track bed plates along the longitudinal direction of the track, the first longitudinal drainage ditch is communicated with the transverse water intercepting ditch to drain water to a rainwater pump house on the side of the tunnel portal, the column is arranged in the transverse water intercepting ditch, the number of the sleepers and the fasteners is multiple respectively, the top end of the column and the track bed plate are respectively provided with the sleepers, the fasteners are installed on each sleeper correspondingly, and the rail is laid on the multiple sleepers through the fasteners.

[0006] Further, the multiple fasteners are uniformly and spacedly arranged along the longitudinal direction of the track.

[0007] Further, each rail is laid on a different column.

[0008] Further, the first longitudinal drainage ditch is located between two adjacent rails, and the columns corresponding to the two adjacent rails are staggered with the first longitudinal drainage ditch.

[0009] Further, the ballastless track structure further comprises a planted bar arranged on a inverted arch of the tunnel, and the column is cast on the planted bar.

[0010] Further, the second longitudinal drainage ditch is provided on the track bed plate away from the tunnel opening side, and the distance between the second longitudinal drainage ditch near the end of the transverse water intercepting ditch and the transverse water intercepting ditch is greater than or equal to 1 m.

[0011] Further, the second longitudinal drainage ditch has a slope, the bottom of the second longitudinal drainage ditch near the end of the transverse water intercepting ditch is flush with the track bed plate, and the bottom of the second longitudinal drainage ditch away from the end of the transverse water intercepting ditch is lower than the track bed plate.

[0012] Further, the slope of the transverse water intercepting ditch is greater than or equal to 2%.

[0013] Further, the side of the column is coated with waterproof paint; and / or the side wall and bottom of the transverse water intercepting ditch are coated with waterproof paint.

[0014] According to another aspect of the present application, a construction method of a ballastless track structure is also provided, which is applied to the above ballastless track structure and includes the following steps: laying the track bed plate to form the transverse water intercepting ditch between two adjacent track bed plates in the longitudinal direction of the track; assembling the sleeper and the tool rail and hoisting and laying the sleeper on the track bed plate; binding the steel bars at the preset position of the column to form a steel bar cage and erecting the formwork, fixing the sleeper on the track bed plate and the top end of the steel bar cage, respectively; pouring concrete into the steel bar cage and curing to form the column, and removing the formwork and the tool rail; and installing the fastener and the rail.

[0015] Further, before the step of binding the steel bars at the preset position of the column to form a steel bar cage and erecting the formwork, fixing the sleeper on the track bed plate and the top end of the steel bar cage, respectively, the method further includes arranging the embedded steel bars at the preset position of the column on the inverted arch of the tunnel.

[0016] Further, before the step of installing the fastener and the rail, the method further includes coating the side of the column with waterproof paint; and / or coating the side wall and bottom of the transverse water intercepting ditch with waterproof paint.

[0017] The ballastless track structure provided by the present application is suitable for the U-shaped groove section of the tunnel opening, a first longitudinal drainage ditch is arranged on the track bed plate near the tunnel opening side, a transverse water intercepting ditch is arranged between two adjacent track bed plates in the longitudinal direction of the track, the first longitudinal drainage ditch is communicated with the transverse water intercepting ditch, rainwater on the tunnel opening side is conveniently drained to the rainwater pump house to avoid water entering the section tunnel, a column is arranged in the transverse water intercepting ditch, the fastener of the track is installed on the sleeper on the column and the track bed plate, the distance between the fasteners is not changed due to the arrangement of the transverse water intercepting ditch, the stability of the track is ensured, the effect of the transverse water intercepting ditch is not affected, and the drainage efficiency is improved. The construction process of the above ballastless track structure is simple and has strong operability, and the construction efficiency and quality are improved. Attached Figure Description

[0018] Figure 1 A schematic diagram of the tunnel outer wall structure for a ballastless track structure provided in an embodiment of the present invention, showing a rainwater pumping station and a sedimentation pit;

[0019] Figure 2 This is a schematic diagram of the ballastless track structure provided in an embodiment of the present invention, which shows the tunnel outer wall, rainwater pumping station and sedimentation pit;

[0020] Figure 3 for Figure 2 A schematic diagram of the ballastless track structure within the transverse intercepting ditch shown in the figure;

[0021] Figure 4 for Figure 2 A schematic diagram of the drainage system for the ballastless track structure shown in the figure;

[0022] Figure 5 A flowchart illustrating the construction method of a ballastless track structure provided in an embodiment of the present invention.

[0023] Explanation of reference numerals in the attached figures:

[0024] 1. Rainwater pumping station; 2. Sedimentation pit; 3. Tunnel wall; 4. Central partition wall;

[0025] 10. Track slab; 11. First longitudinal drainage ditch; 12. Second longitudinal drainage ditch; 13. Transverse intercepting ditch;

[0026] 20. Column; 30. Rail; 40. Sleeper; 50. Fastener; 60. Rebar. Detailed Implementation

[0027] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The terms "first," "second," etc., used in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number or order of the indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0028] Reference Figures 1 to 4In a first aspect of the embodiments of the present application, a ballastless track structure is provided for a U-shaped groove section of a tunnel portal, comprising a track bed plate 10, a steel rail 30, a sleeper 40, a fastener 50, and a column 20. The track bed plate 10 near the side of the tunnel portal has a first longitudinal drainage ditch 11, and a transverse water intercepting ditch 13 is formed between two adjacent track bed plates 10 along the longitudinal direction of the track. The first longitudinal drainage ditch 11 is communicated with the transverse water intercepting ditch 13 to drain water to a rainwater pump house 1 on the side of the tunnel portal. The column 20 is arranged in the transverse water intercepting ditch 13. The number of sleepers 40 and fasteners 50 is multiple respectively. The top end of the column 20 and the track bed plate 10 are respectively provided with the sleepers 40. The fastener 50 is installed on each sleeper 40 correspondingly. The steel rail 30 is laid on the multiple sleepers 40 through the fastener 50.

[0029] It can be understood that when the amount of rainwater is large, the longitudinal slope drainage of the U-shaped groove section cannot meet the requirements. In order to make the U-shaped groove section drain smoothly, multiple transverse water intercepting ditches need to be arranged at the position of the track bed plate at the tunnel portal. However, once the transverse water intercepting ditch is arranged, the distance between the fasteners will change, and the integrity of the original track bed structure will inevitably be damaged. If the track structure is still designed and constructed according to the previous design, the thickness of the protective layer of the sleeper will not meet the requirements due to the existence of the transverse water intercepting ditch, which will affect the durability and stability of the track structure, and a large number of maintenance and repair costs will be generated during operation.

[0030] The ballastless track structure of the embodiments of the present application is suitable for the U-shaped groove section of the tunnel portal. The first longitudinal drainage ditch 11 is arranged on the track bed plate 10 near the side of the tunnel portal. The transverse water intercepting ditch 13 is arranged between two adjacent track bed plates 10 along the longitudinal direction of the track. The first longitudinal drainage ditch 11 is communicated with the transverse water intercepting ditch 13, which facilitates the drainage of water to the rainwater pump house 1 on the side of the tunnel portal to avoid water entering the upper surface of the track bed plate 10. The column 20 is arranged in the transverse water intercepting ditch 13. The fastener 50 of the track is installed on the sleeper 40 on the column 20 and the track bed plate 10. The distance between the fasteners 50 is not changed due to the arrangement of the transverse water intercepting ditch 13, which not only ensures the stability of the line but also does not affect the function of the transverse water intercepting ditch 13, and improves the drainage efficiency. The above ballastless track structure has simple construction process and strong operability, which improves the construction efficiency and quality.

[0031] It can be understood that the first longitudinal drainage ditch 11 arranged on the track bed plate 10 near the side of the tunnel portal can drain water to the transverse water intercepting ditch 13. The transverse water intercepting ditch 13 is communicated with the rainwater pump house 1 on the side of the tunnel portal, and finally the water can be drained to the rainwater pump house 1. Between the transverse water intercepting ditch 13 and the rainwater pump house 1, a sand settling pit 2 is generally arranged. The rainwater flows into the rainwater pump house 1 through the sand settling pit 2. Referring to Figure 1 , the rainwater pump house 1 is arranged outside the tunnel wall 3, which can avoid the backflow of water in the rainwater pump house 1 into the tunnel.

[0032] In the embodiment of the present application, the first longitudinal drainage ditch 11 arranged on the track bed slab 10 does not affect the laying of the sleeper 40 and the rail 30. The first longitudinal drainage ditch 11 has a slope, so that the water from the ground flows into the rainwater pumping station 1, avoiding entering the tunnel section. Generally, the slope of the first longitudinal drainage ditch 11 is consistent with the longitudinal slope of the line. The transverse drainage ditch 13 is arranged between the track bed slabs 10, so that the water from the first longitudinal drainage ditch 11 flows into the rainwater pumping station 1, and the sufficient drainage space thereof can avoid the situation that drainage is not timely when the rainwater amount is large. In order to facilitate drainage, the slope of the transverse drainage ditch 13 is set to be greater than or equal to 2%.

[0033] In the embodiment of the present application, the column 20 arranged in the transverse drainage ditch 13 does not affect the drainage of the transverse drainage ditch 13. The top end of the column 20 is provided with the sleeper 40, and the rail 30 is laid on the sleeper 40 through the fastener 50, which requires that the sleeper 40 on the column 20 and the sleeper 40 on the track bed slab 10 can meet the requirements of track laying. Therefore, the height of the column 20 can be determined by the bottom elevation of the transverse drainage ditch 13 and the height of the track structure, and the number and position of the column 20 are determined by the spacing of the fastener 50. The rail 30 is connected with the sleeper 40 through the fastener 50, so as to ensure the geometric position stability of the line. Specifically, in the embodiment of the present application, the length of the column 20 is 1.06 m, and the width is 0.40 m. The column 20 can be prefabricated or cast on site.

[0034] The ballastless track structure of the embodiment of the present application can be applied to one track line or multiple track lines, and the middle partition wall 4 is arranged between the multiple track lines. The transverse drainage ditch 13 is communicated with the first longitudinal drainage ditch 11 of each track line, and the transverse drainage ditch 13 and the one or more first longitudinal drainage ditches 11 each have a certain slope, so as to ensure that all the rainwater flows into the rainwater pumping station 1, and improve the drainage efficiency.

[0035] In some embodiments, the plurality of fasteners 50 are uniformly and evenly arranged along the track in the longitudinal direction. It can be understood that the column 20 arranged in the transverse drainage ditch 13 is to ensure that the spacing between the fasteners 50 does not change, that is, the plurality of fasteners 50 can still be uniformly and evenly arranged along the track in the longitudinal direction, and the integrity of the original track bed structure is ensured. That is, the arrangement of the column 20 compensates for the potential disadvantages brought by the transverse drainage ditch 13, so as to ensure the durability and stability of the track structure.

[0036] It can be understood that the column 20 corresponding to the two adjacent steel rails 30 can be one or more, that is, the column 20 under the two adjacent steel rails 30 can be the same or can be different columns 20 arranged at intervals. In some embodiments, each steel rail 30 is laid on a different column 20. In the embodiments of the present application, the adjacent steel rails 30 are not laid on the same column 20, but are laid on different columns 20 arranged at intervals, so that less space of the transverse drainage ditch 13 can be occupied to improve the drainage efficiency. In addition, referring to Figure 2 , Figure 3 , the column 20 corresponding to each steel rail 30 is arranged along the transverse direction of the transverse drainage ditch 13, and the column 20 can be one or more, and the number of columns 20 is determined by the spacing of the fastener 50.

[0037] In some embodiments, the first longitudinal drainage ditch 11 is located between the two adjacent steel rails 30, and the columns 20 corresponding to the two adjacent steel rails 30 are arranged staggered with the first longitudinal drainage ditch 11. Referring to Figure 2 It can be understood that the first longitudinal drainage ditch 11 cannot affect the track laying, so the first longitudinal drainage ditch 11 is arranged between the two steel rails 30. In addition, the first longitudinal drainage ditch 11 is arranged staggered with the columns 20 corresponding to the two adjacent steel rails 30, so that the end of the first longitudinal drainage ditch 11 close to the transverse drainage ditch 13 corresponds to the space between the columns 20 of the two adjacent steel rails 30, and the water can be drained into the transverse drainage ditch 13 without obstruction.

[0038] In some embodiments, the ballastless track structure further comprises a planted bar 60 arranged on the inverted arch of the tunnel, and the column 20 is cast on the planted bar 60. Specifically, the planted bar 60 is arranged on the inverted arch of the tunnel, and is roughened or roughened to facilitate the on-site casting of the column 20, improve the connection performance between the column 20 and the inverted arch, and make the column 20 as a track support more stable.

[0039] In some embodiments, the track bed plate 10 away from the side of the tunnel portal has a second longitudinal drainage ditch 12, and the distance between the end of the second longitudinal drainage ditch 12 close to the transverse drainage ditch 13 and the transverse drainage ditch 13 is greater than or equal to 1 m. That is, the second longitudinal drainage ditch 12 is arranged on the track bed plate 10 far away from the tunnel portal, but the second longitudinal drainage ditch 12 does not penetrate the track bed plate 10, but has a distance greater than or equal to 1 m from the end of the track bed plate 10 close to the transverse drainage ditch 13. This can prevent ground rainwater from flowing into the tunnel.

[0040] It can be understood that the second longitudinal drainage ditch 12 is also provided with a certain slope, so that the rainwater from the ground flows away from the track bed slab 10. Further, the second longitudinal drainage ditch 12 has a slope, the bottom of the second longitudinal drainage ditch 12 near one end of the transverse drainage ditch 13 is flush with the track bed slab 10, and the bottom of the second longitudinal drainage ditch 12 away from one end of the transverse drainage ditch 13 is lower than the plane of the track bed slab 10. That is, the second longitudinal drainage ditch 12 is inclined towards the direction away from the tunnel portal, so as to facilitate the rainwater entering from the tunnel portal to flow away from the track bed slab 10.

[0041] Further, the circumferential side of the column 20 is painted with waterproof paint. In other embodiments, the side wall and the bottom of the transverse drainage ditch 13 are painted with waterproof paint. The side wall and the bottom of the first longitudinal drainage ditch 11 and the second longitudinal drainage ditch 12 are painted with waterproof paint. Painting the circumferential side of the column 20 and the bottom and circumferential side of the transverse drainage ditch 13 and the longitudinal drainage ditch with waterproof paint can prevent the penetration of rainwater and ensure the durability and stability of the ballastless track structure.

[0042] In a second aspect, the application provides a construction method of a ballastless track structure, which is suitable for the ballastless track structure described above, and includes the following steps: Figure 5 S1, laying the track bed slab 10 to form the transverse drainage ditch 13 between the two adjacent track bed slabs 10 in the longitudinal direction of the track; S2, assembling the sleeper 40 and the tool rail and hoisting and laying them on the track bed slab 10; S3, binding the steel bars to form a steel bar cage at the preset position of the column 20 and erecting the formwork, fixing the sleeper 40 on the track bed slab 10 and the top end of the steel bar cage respectively; S4, pouring concrete into the steel bar cage and curing to form the column 20, and removing the formwork and the tool rail; and S5, installing the fastener 50 and the steel rail 30.

[0043] In the application, the sleeper 40 and the tool rail are assembled before the column 20 is constructed in step S2, instead of directly laying the steel rail 30. On the one hand, the tool rail is much shorter than the steel rail 30, and the construction is very simple; on the other hand, the steel rail 30 is also prevented from being damaged in the process of steel bar binding and concrete pouring. In step S4, the column 20 is constructed by pouring on site, and the tool rail needs to be erected in advance and the fastener 50 needs to be hoisted, the geometric state of the track is adjusted, and then the steel bars are bound, the formwork is erected, and pouring is performed. The pouring of the column 20 is completed at one time to avoid the phenomenon of misalignment and cracking, the construction quality is strictly controlled, and the top end of the column 20 is ensured to be flat. The construction process of the ballastless track structure of the application is simple and has strong operability, and the construction efficiency and quality are improved.

[0044] In some embodiments, before the steps of binding the steel bars to form the steel cage and erecting the formwork, and fixing the sleepers 40 on the track bed slab 10 and the top end of the steel cage in the preset positions of the columns 20, the method further comprises: arranging the anchor bars 60 on the invert of the tunnel in the preset positions of the columns 20. In the embodiments of the application, the anchor bars 60 are arranged on the invert before the steel bars are bound to form the steel cage and the columns 20 are poured, and after the anchor bars 60 are arranged, the chiseling or roughening is performed, so as to facilitate the on-site pouring of the columns 20 and improve the connection performance between the columns 20 and the invert, so that the stability of the columns 20 as the track support is better.

[0045] In some embodiments, before the steps of installing the fasteners 50 and the rails 30, the method further comprises: brushing waterproof paint on the circumferential side of the columns 20; and / or brushing waterproof paint on the side wall and the bottom of the transverse water collecting trench 13. In the embodiments of the application, the circumferential side of the columns 20 and the bottom and the circumferential side of the transverse water collecting trench 13 and the longitudinal drainage ditch are brushed with waterproof paint, which can prevent the penetration of rainwater and ensure the durability and stability of the ballastless track structure.

[0046] With reference to Figure 4 The ballastless track structure of the embodiments of the application is used in the U-shaped groove section of the tunnel portal, and when it rains, a large amount of rainwater flows into the section tunnel along the longitudinal slope from the ground. The rainwater enters the transverse water collecting trench 13 through the first longitudinal drainage ditch 11, and the sufficient space in the transverse water collecting trench 13 can ensure that the rainwater flows into the rainwater pump house 1 through the sand trap 2 in time, avoiding the rainwater from entering the upper surface of the track bed slab 10; the second longitudinal drainage ditch 12 is not connected with the water collecting trench, so as to prevent the rainwater from continuing to flow into the tunnel interior. The first longitudinal drainage ditch 11, the second longitudinal drainage ditch 12 and the transverse water collecting trench 13 all have a certain slope to improve the drainage efficiency. Waterproof paint is brushed on the bottom and the side wall of the longitudinal drainage ditch and the transverse water collecting trench 13, and waterproof paint is brushed on the circumferential side of the columns 20 to prevent the penetration of rainwater and ensure the durability of the track structure. In the embodiments of the application, the top end of the columns 20 arranged in the transverse water collecting trench 13 is paved with the sleepers 40, and the rails 30 are paved through the fasteners 50 installed on the sleepers 40, without changing the spacing of the fasteners 50, so as to expand the drainage space, improve the drainage efficiency, and ensure the stability of the track line.

[0047] The above merely describes specific embodiments of the present application, but the protection scope of the present application is not limited thereto, and any person skilled in the art can easily think of changes or replacements within the technical scope disclosed by the present application, which should be covered within the protection scope of the present application. Furthermore, the technical solutions of each embodiment of the present application can be combined with each other, but must be based on the realization of a person skilled in the art, and when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, and is not within the protection scope required by the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. A ballastless track structure for a U-shaped groove section of a tunnel portal, characterized in that: The ballastless track structure comprises a track bed plate, a rail, a sleeper, a fastener and a column, the track bed plate near the side of the tunnel opening has a first longitudinal drainage ditch, two adjacent track bed plates in the longitudinal direction of the track form a transverse water interception ditch, the first longitudinal drainage ditch and the transverse water interception ditch are communicated to drain to the rainwater pump room on the side of the tunnel opening; The column is arranged in the transverse water interception ditch, the number of the sleepers and the fasteners is multiple respectively, the top end of the column and the track bed plate are respectively provided with the sleepers, the fasteners are respectively installed on each sleeper, and the rail is laid on the multiple sleepers through the fasteners.

2. The ballastless track structure according to claim 1, characterized in that The multiple fasteners are uniformly and spacedly arranged in the longitudinal direction of the track.

3. The ballastless track structure according to claim 1, characterized in that Each rail is laid on different columns.

4. The ballastless track structure according to claim 3, characterized in that The first longitudinal drainage ditch is located between two adjacent rails, and the columns corresponding to the two adjacent rails are staggered with the first longitudinal drainage ditch.

5. The ballastless track structure according to claim 1, characterized in that, The ballastless track structure further comprises a planted bar arranged on the inverted arch of the tunnel, and the column is cast on the planted bar.

6. The ballastless track structure according to any one of claims 1 to 5, characterized in that The track bed plate away from the side of the tunnel opening has a second longitudinal drainage ditch, and the distance between the end of the second longitudinal drainage ditch close to the transverse water interception ditch and the transverse water interception ditch is greater than or equal to 1 m.

7. The ballastless track structure according to claim 6, characterized in that The second longitudinal drainage ditch has a slope, the bottom of the end of the second longitudinal drainage ditch close to the transverse water interception ditch is flush with the track bed plate, and the bottom of the end of the second longitudinal drainage ditch away from the transverse water interception ditch is located on a plane lower than the plane of the track bed plate.

8. The ballastless track structure according to any one of claims 1 to 5, characterized in that The slope of the transverse water interception ditch is greater than or equal to 2%.

9. The ballastless track structure according to any one of claims 1 to 5, characterized in that The side of the column is coated with waterproof paint; and / or The side wall and the bottom of the transverse water interception ditch are coated with waterproof paint.

10. A method of constructing a ballastless track structure, characterized by The ballastless track structure applied to any one of claims 1-9 comprises the following steps: Laying the track bed plate to form the transverse water interception ditch between two adjacent track bed plates in the longitudinal direction of the track; Assembling the sleepers and the tool rail and hoisting and laying them on the track bed plate; Binding the steel bars at the preset positions of the columns to form the steel bar cages and erecting the forms, fixing the sleepers on the track bed plates and the top ends of the steel bar cages; Pouring the concrete into the steel bar cages and curing to form the columns, and removing the forms and the tool rail; Installing the fasteners and the rail.

11. The construction method of a ballastless track structure according to claim 10, characterized in that, Before the step of binding the steel bars at the preset positions of the columns to form the steel bar cages and erecting the forms, fixing the sleepers on the track bed plates and the top ends of the steel bar cages, the method further comprises arranging the planted bars at the preset positions of the columns on the inverted arch of the tunnel.

12. The construction method of a ballastless track structure according to claim 10, wherein Before the step of installing the fasteners and the rail, the method further comprises coating the side of the column with waterproof paint; and / or coating the side wall and the bottom of the transverse water interception ditch with waterproof paint.

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