Railway roadbed body steel flower pipe grouting reinforcement method and railway roadbed

Abstract

The present invention provides a railway roadbed steel pipe grouting reinforcement method and a railway roadbed, the reinforcement method includes the following steps: determining the position on the railway roadbed that needs grouting; placing the steel pipe in the position that needs grouting, the steel pipe includes a first steel pipe and a second steel pipe, the first steel pipe is inserted from the slope and / or shoulder of the railway roadbed obliquely toward the bottom of the railway roadbed; the second steel pipe is arranged in the railway roadbed along the vertical direction, the second steel pipe is located on the side of the first steel pipe away from the center line of the railway roadbed; grouting is performed in the steel pipe, firstly injecting the first slurry into the second steel pipe to form a grouting curtain, and then injecting the first slurry into the first steel pipe. The reinforcement method adopts the steel pipe grouting method, which has little disturbance to the railway roadbed, simple construction method and good reinforcement effect; forming an outer grouting curtain to prevent the first slurry from diffusing to the outside of the railway roadbed, and effectively controlling the reinforcement effect of the railway roadbed.

Description

Technical Field

[0001] The invention relates to the technical field of railway roadbed reinforcement, and in particular to a railway roadbed reinforcement method for a steel flower pipe grouting reinforcement and a railway roadbed. Background Art

[0002] Affected by geological conditions, external climate changes, construction process management and other factors, the operating railway road base, especially the road base with poor filler gradation, will produce cumulative deformation under the dynamic and static loads of trains; under the influence of complex climatic conditions such as long-term rainfall, the fine particles in the road base will be lost through the pores, the density of the road base will be reduced, and the uneven settlement of the road base will be aggravated. When the train passes at a high speed, on the one hand, it will cause damage to the train and accelerate the wear of the train. On the other hand, it will cause the train to jump, which is easy to cause the train to shake. In severe cases, it may cause the subgrade to sink and the train to derail, threatening driving safety.

[0003] When the settlement of operating railways is being rectified, trains are generally required to limit their speed but not to stop operating. Therefore, the rectification measures that need to be taken must not infringe on the operating railways, and the settlement and lateral deformation caused must not affect the normal operation of the railways, and must be completed within the nighttime railway skylight point. At present, the reinforcement of the fill road body of the operating railway is generally solved by the sleeve valve tube grouting solution, that is, first make a hole and pour the shell material, insert the sleeve valve tube and the core tube into the shell material, and then implement the segmented grouting after the shell material reaches a certain strength, which can play a role in reinforcing the road body and preventing further increase of settlement. The advantage of this scheme is that it can realize segmented and multiple fixed-point grouting; the disadvantage is that the construction steps are many and complicated, the construction equipment is large, and there are many disturbances to the railway body, especially in the process of pneumatic drilling. Because the diameter of the drilled hole is large, the filling material of the road body is greatly disturbed during construction, especially the disturbance of the filling material with larger particle size. The settlement deformation of the road body is difficult to control, which can easily cause the settlement of the road body to exceed the limit, and it is difficult to recover within the skylight point, thus affecting the normal operation of the railway. Therefore, it is of great significance to study a construction method and structure for reinforcing the basic body of fill roads. Summary of the invention

[0004] The purpose of the present invention is to provide a railway roadbed steel flower pipe grouting reinforcement method and a railway roadbed, so as to solve the technical problems of the reinforcement method in the prior art that the reinforcement method has a large disturbance to the railway roadbed and the construction is complicated.

[0005] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0006] According to a first aspect of the present invention, a method for grouting reinforcement of a railway road base body with steel flower pipes is provided, comprising the following steps: determining a position on the railway road base body that requires grouting; placing the steel flower pipes at the position that requires grouting, wherein the steel flower pipes include a first steel flower pipe and a second steel flower pipe, the first steel flower pipe being inserted obliquely from the slope and / or shoulder of the railway road base body toward the bottom of the railway road base body; the second steel flower pipe being arranged in the railway road base body in a vertical direction, the second steel flower pipe being located on a side of the first steel flower pipe away from the center line of the railway road base body; and grouting into the steel flower pipes, wherein a first slurry is firstly injected into the second steel flower pipe to form a grouting curtain, and then the first slurry is injected into the first steel flower pipe.

[0007] Furthermore, the first slurry comprises a mixture obtained by adding a polycarboxylate water reducer into cement slurry.

[0008] Furthermore, before the step of injecting grout into the steel flower pipe, filling grooves surrounding the pipe openings are formed on the circumference of the pipe openings of the steel flower pipe, and second slurry is injected into the filling grooves to close the filling grooves.

[0009] Furthermore, the second slurry includes a mixture of cement slurry, coarse fiber and water glass; and / or the depth of the filling tank is greater than or equal to 2 meters.

[0010] Furthermore, the steel flower pipe comprises a plurality of rows of overflow holes and a protective net, each row of the overflow holes is arranged along the length direction of the steel flower pipe, and the protective net is installed at the overflow holes.

[0011] Furthermore, the step of placing the steel flower pipe into the position where grouting is required specifically includes: directly ramming the steel flower pipe into the railway basic body; or, drilling grouting holes at the position where grouting is required on the railway basic body, and then ramming the steel flower pipe into the grouting holes, and the aperture of the grouting holes is less than or equal to the outer diameter of the steel flower pipe.

[0012] Furthermore, the step of injecting the first slurry into the first steel flower tube specifically includes: injecting the first slurry into the first steel flower tube in sequence from the outer side of the railway road base body to the center line direction of the railway road base body.

[0013] According to a second aspect of the present invention, there is further provided a railway roadbed, comprising a railway roadbed body, a steel flower pipe and a first grouting body, wherein the steel flower pipe comprises a first steel flower pipe and a second steel flower pipe, wherein the first steel flower pipe is inserted obliquely from the slope and / or shoulder of the railway roadbed body toward the bottom of the railway roadbed body, and the second steel flower pipe is arranged in the railway roadbed body in a vertical direction, and the second steel flower pipe is located on a side of the first steel flower pipe away from the center line of the railway roadbed body; the first grouting body is formed by injecting a first slurry into the steel flower pipe, and the second steel flower pipe and the first grouting body corresponding to the second steel flower pipe form a grouting curtain in the railway roadbed body.

[0014] Furthermore, the outer diameter of the steel flower tube is 38 mm to 45 mm, and the wall thickness is 2 mm to 4 mm.

[0015] Furthermore, the railway roadbed includes a second grouting body, and the second grouting body is coated on the outer peripheral side of the pipe mouth of the steel flower pipe.

[0016] Furthermore, the first steel flower tube and the second steel flower tube are arranged on opposite sides of the railway road base body along the center line, the first steel flower tubes are staggered in a grid shape within the railway road base body, and the angle between the first steel flower tube and the plane where the bottom of the railway road base body is located is 25° to 45°.

[0017] The steel flower tube grouting reinforcement method for the railway road base provided by the present invention obliquely inserts a first steel flower tube from the slope and / or shoulder of the railway road base, and places a second steel flower tube in the same row or outside of the first steel flower tube away from the center line direction of the railway road base. The second steel flower tube is placed in the vertical direction to form an outer grouting curtain to prevent the first slurry from diffusing to the outside of the railway road base, effectively controlling the reinforcement effect of the railway road base. The above grouting reinforcement method adopts the steel flower tube grouting method, which has little disturbance to the railway road base, and the construction method is simple and the reinforcement effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 A construction flow chart of a railway foundation steel pipe grouting reinforcement method provided by an embodiment of the present invention;

[0019] Figure 2 A schematic diagram of the structure of a steel flower pipe in a railway roadbed provided by an embodiment of the present invention;

[0020] Figure 3 A schematic cross-sectional view of a railway subgrade provided by an embodiment of the present invention;

[0021] Figure 4 for Figure 3 A schematic plan view of the railway embankment shown;

[0022] Figure 5 A schematic cross-sectional view of a railway roadbed provided in accordance with another embodiment of the present invention;

[0023] Figure 6 for Figure 5 The schematic plan view of the railway embankment is shown.

[0024] Description of reference numerals:

[0025] 10. Steel flower pipe; 11. First steel flower pipe; 12. Second steel flower pipe; 13. Overflow hole; 14. Conical pipe head; 20. Railway road base; 30. Shoulder; 40. Slope; 50. Slope foot. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. Figure 3 The directions or positions shown, where "upper" and "lower" refer to Figure 3 It should be understood that these directional terms are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0027] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number or order of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0028] Reference Figure 1 In a first aspect of an embodiment of the present invention, a method for grouting reinforcement of a railway road base body with steel flower pipes is provided, comprising the following steps: S1, determining a position on a railway road base body 20 where grouting is required; S2, placing a steel flower pipe 10 at the position where grouting is required, wherein the steel flower pipe 10 comprises a first steel flower pipe 11 and a second steel flower pipe 12, wherein the first steel flower pipe 11 is inserted obliquely from a side slope 40 and / or a shoulder 30 of the railway road base body 20 toward the bottom of the railway road base body 20; the second steel flower pipe 12 is arranged in the railway road base body 20 along a vertical direction, and the second steel flower pipe 12 is located on a side of the first steel flower pipe 11 away from the center line of the railway road base body 20, with reference to Figure 3 ; S3, grouting into the steel flower tube 10, wherein the first slurry is first injected into the second steel flower tube 12 to form a grouting curtain, and then the first slurry is injected into the first steel flower tube 11.

[0029] The railway road base body steel flower pipe grouting reinforcement method provided by the embodiment of the present invention obliquely inserts the first steel flower pipe 11 from the slope 40 and / or shoulder 30 of the railway road base body 20, and places the second steel flower pipe 12 in the same row or outside of the first steel flower pipe 11 away from the center line direction of the railway road base body 20. The second steel flower pipe 12 is placed in the vertical direction to form an outer grouting curtain to prevent the first slurry from diffusing to the outside of the railway road base body 20, and effectively control the reinforcement effect of the railway road base body 20. The above-mentioned grouting reinforcement method adopts the steel flower pipe grouting method, which has little disturbance to the railway road base body 20, and the construction method is simple and the reinforcement effect is good.

[0030] Specifically, the railway road base body 20 is monitored, the positions on the railway road base body 20 that need grouting are determined, and the grouting holes are designed at the positions that need grouting, and the adjacent rows of grouting holes are arranged in a staggered manner in a plum blossom shape. The grouting holes can be located on the shoulder 30 and / or the slope 40 of the railway road base body 20. The grouting holes are marked. The first steel flower pipe 11 enters the railway road base body 20 from the grouting hole position and is staggered in a mesh shape. When the first steel flower pipe 11 is placed in the railway road base body 20, the first steel flower pipe 11 extends in the direction of the center line of the railway road base body 20. Each row of the first steel flower pipe 11 is evenly distributed in the railway road base body 20.

[0031] Reference Figures 3 to 6 , the second steel flower tube 12 is placed in the railway road base body 20 in the same row or outside of the first steel flower tube 11 away from the center line direction of the railway road base body 20, that is, the position of the pipe mouth of the second steel flower tube 12 on the slope 40 is located in the same row or below the position of the pipe mouth of the first steel flower tube 11 on the slope 40, and is closer to the slope foot 50 than the first steel flower tube 11. The first steel flower tubes 11 are arranged in sequence from the outside of the railway road base body 20 to the direction of its center line. The second steel flower tube 12 is placed in the same row or on the side away from the center line of the railway road base body 20 of the outermost first steel flower tube 11 of the railway road base body 20. The second steel flower tube 12 and the grouting curtain formed by injecting the first slurry into the second steel flower tube 12 are located on the side of the first steel flower tube 11 away from the center line of the railway road base body 20. During grouting, grouting is first injected into the second steel tube 12 , that is, a grouting curtain or barrier can be formed on the outside and bottom of the railway road base body 20 to prevent the first slurry injected into the first steel tube 11 from flowing out of the railway road base body 20 .

[0032] In some embodiments, reference Figure 2The outer diameters of the first steel flower tube 11 and the second steel flower tube 12 are 38 mm to 45 mm, and the wall thicknesses are 2 mm to 4 mm, respectively. In this embodiment, the first steel flower tube 11 and the second steel flower tube 12 preferably have an outer diameter of 42 mm and a wall thickness of 3 mm. The front ends of the first steel flower tube 11 and the second steel flower tube 12, i.e., the ends that first enter the railway road base body 20, are welded with a conical pipe head 14, and the length of each steel flower tube can be processed into 2 m to 6 m according to the actual situation on site.

[0033] In some embodiments, the first steel flower tube 11 and the second steel flower tube 12 respectively include multiple rows of overflow holes 13 and a protective net, each row of overflow holes 13 is arranged along the length direction of the first steel flower tube 11 or the second steel flower tube 12, and the protective net is installed at the overflow hole 13. The overflow hole 13 is a through hole arranged on the tube wall of the first steel flower tube 11 and the second steel flower tube 12, and a protective net is arranged on the overflow hole 13 to prevent the first steel flower tube 11 and the second steel flower tube 12 from having large particles of slag entering the tube during the installation process, while ensuring that the first slurry in the tube can smoothly overflow and diffuse into the railway road base body 20. It can be understood that the protective net can be installed in the overflow hole 13 or outside the overflow hole 13, and the outside of the overflow hole 13 includes the outer wall of the steel flower tube and the inner wall of the steel flower tube, that is, the protective net can be installed on the outer wall and / or inner wall of the steel flower tube at the overflow hole 13. The installation method can be welding.

[0034] Specifically, four rows of overflow holes 13 are arranged on a steel flower tube with an outer diameter of 42 mm and a wall thickness of 3 mm. The four rows of overflow holes 13 are evenly arranged on the tube wall of the steel flower tube along the circumference of the steel flower tube. The spacing between the overflow holes 13 in the same row is 40 cm, and the overflow holes 13 in two adjacent rows are arranged in a staggered manner in a plum blossom shape, and the hole diameter of the overflow holes 13 is 6 mm.

[0035] In some embodiments, the step of placing the steel flower pipe 10 at the position where grouting is required in step S2 specifically includes: directly tamping the steel flower pipe 10 into the railway road base body 20; or, drilling a grouting hole at the position where grouting is required on the railway road base body 20, and then tamping the steel flower pipe 10 into the grouting hole, and the hole diameter of the grouting hole is less than or equal to the outer diameter of the steel flower pipe 10. When grouting is performed using the above grouting method, there is no need to form a grouting hole in advance or the hole diameter of the formed grouting hole is small, so the disturbance to the railway road base body 20 is small, and the construction method is also very simple.

[0036] Specifically, there are two methods for placing the first steel flower tube 11 or the second steel flower tube 12 into the railway road base body 20. One method is to use a TY-28 pneumatic pick to tamp the first steel flower tube 11 or the second steel flower tube 12 into the railway road base body 20. If it is difficult to tamp directly into the railway road base body 20 or the work efficiency is low, another method is to use a ZQS-50 handheld drill that has little disturbance to the stratum, is light and easy to move, to drive a twist drill rod to drill a hole, and the hole diameter corresponds to the diameter of the first steel flower tube 11 or the second steel flower tube 12. When the drill passes through the gravel layer, the drill rod is withdrawn, and then the TY-28 pneumatic pick is used to tamp it into the railway road base body 20.

[0037] In some embodiments, before the step of injecting the first slurry into the first steel tube 11 and the second steel tube 12, respectively, a filling groove surrounding the tube mouth is formed on the circumference of the tube mouth of the first steel tube 11 and the second steel tube 12, and the second slurry is injected into the filling groove to close the filling groove. It can be understood that the second slurry is injected into the filling groove, and the steel tube can be shaken slightly, repeatedly several times, until the second slurry no longer continues to seep, so that the second slurry can be filled between the filling groove and the tube wall of the steel tube 10, in order to form a closed grouting space, and prevent the first slurry from overflowing the overflow hole 13 and then flowing along the tube wall of the steel tube to the outside of the railway roadbed 20. Wherein, the depth of the filling groove is greater than or equal to 2m. Further, the second slurry includes a mixture of cement slurry, coarse fiber and water glass. The second slurry is easier to solidify than the first slurry, and the first slurry cannot flow out of the solidified second slurry, which can effectively prevent the first slurry overflowing from the overflow hole 13 from diffusing along the steel tube wall to the outside of the railway road base body 20, and the first slurry is diffused in the railway road base body 20 to reinforce the road base body. After the steel tube 10 is placed in the railway road base body 20 and the filling groove around the tube mouth of the steel tube 10 is sealed with the second slurry, the first slurry can be injected into the second steel tube 12 and the first steel tube 11 in sequence.

[0038] In some embodiments, reference Figures 3 to 6, the step of injecting the first slurry into the first steel flower tube 11 specifically includes: injecting the first slurry into the first steel flower tube 11 in sequence from the outside of the railway road base body 20 to the center line direction of the railway road base body 20. Specifically, a grouting joint is welded on the first steel flower tube 11, and the grouting pipeline is connected to the grouting joint for grouting. The process of injecting the first slurry is a one-time grouting of the whole hole, and the grouting is controlled to end according to the grouting pressure and monitoring data. In other words, the overall construction sequence of injecting the first slurry is to first construct the first steel flower tube 11 at the bottom of the slope foot 50, that is, first construct the first steel flower tube 11 at the outermost side of the railway road base body 20, and then construct each row of the first steel flower tube 11 in sequence from the outside of the railway road base body 20 to its center line direction. In this embodiment, the construction sequence of grouting into the first steel flower tube 11 is to grout from the outside to the inside of the railway road base body 20 in sequence, so as to ensure that the first slurry continuously reinforces the railway road base body 20 from the outside to the inside, thereby enhancing the reinforcement effect.

[0039] Furthermore, the first slurry injected into the first steel flower tube 11 and the second steel flower tube 12 includes a mixture obtained by adding a polycarboxylate water reducer to cement slurry. Specifically, the cement slurry is made of P.042.5 ordinary Portland cement at a water-cement ratio of 0.6:1, and 1% of polycarboxylate water reducer (the polycarboxylate water reducer grade of this embodiment is KDSP-1) is added to the cement slurry to obtain a mixture, which is the first slurry. The pressure of the first slurry injected is determined by experiment. The grouting pressure on the slope 40 should generally not exceed 0.5MPa, and the grouting pressure on the shoulder 30 should not exceed 0.2MPa. When the grouting pressure exceeds the above limit and the grouting amount is less than 2.5L / min, the stabilization time is greater than 5min, or the deformation monitoring reaches the safety alarm value, the grouting is terminated.

[0040] The railway foundation body steel flower pipe grouting reinforcement method of the embodiment of the present invention has the following specific construction steps:

[0041] 1. According to the monitoring results and design requirements of the railway foundation 20, mark the locations where grouting is required and re-measure, and the hole position deviation is no more than 10cm. Arrange the grouting holes in a plum blossom-shaped staggered manner at the locations where grouting is required, measure and lay out the lines, and mark them.

[0042] 2. Make the first steel flower tube 11 and the second steel flower tube 12. Arrange 4 rows of overflow holes 13 on the steel flower tube 10 with an outer diameter of 42mm and a wall thickness of 3mm. The angle between the 4 rows of overflow holes 13 is 90 degrees. The spacing between the overflow holes 13 in the same row is 40cm. The overflow holes 13 in two adjacent rows are arranged in a staggered manner in a plum blossom shape. The aperture of the overflow holes 13 is 6mm. Weld a conical pipe head 14 at the end of the front section of the steel flower tube 10. At the same time, in order to prevent the steel flower tube 10 from having debris entering the tube during the installation process, a fine mesh protection net will be welded on the overflow holes 13 of the steel flower tube 10. General rock and soil particles cannot enter, but the slurry can overflow smoothly. The steel flower tubes 10 are connected by steel sleeve welding. The length of each section of the steel flower tube 10 can be processed into 2m to 6m according to the actual situation on site.

[0043] 3. Directly tamp or lead holes to insert the first steel flower pipe 11 and the second steel flower pipe 12. If the ground conditions are good, use a TY-28 pneumatic pick to tamp the first steel flower pipe 11 or the second steel flower pipe 12 into the railway road base body 20; if it is difficult to tamp directly into the railway road base body 20 or the work efficiency is low, a ZQS-50 handheld drill with little disturbance to the ground, light and easy to move can be used to drive a twist drill rod to drill holes, and the hole diameter corresponds to the diameter of the first steel flower pipe 11 or the second steel flower pipe 12. When the drill passes through the gravel layer, withdraw the drill rod, and then use a TY-28 pneumatic pick to tamp it into the railway road base body 20. Among them, the first steel flower pipe 11 is obliquely inserted from the slope 40 and / or shoulder 30 of the railway road base body 20 to the bottom of the railway road base body 20, and the second steel flower pipe 12 is vertically inserted from the slope 40 to the railway road base body 20.

[0044] 4. Seal. Dig a filling groove with a depth of not less than 2m around the pipe openings of the first steel flower pipe 11 and the second steel flower pipe 12, pour the second slurry obtained by mixing cement slurry, coarse fiber and water glass into the filling groove, and gently vibrate the steel flower pipe 10 with a small hammer to make the second slurry fill the filling groove, repeat several times until the second slurry no longer seeps.

[0045] 5. Grouting. Weld grouting joints on the first steel flower tube 11 and the second steel flower tube 12, connect the grouting joints with the grouting pipeline, and perform one-time grouting of the entire hole. The pressure of the first slurry injected is determined by testing. The grouting pressure on the slope 40 should generally not exceed 0.5MPa, and the grouting pressure on the shoulder 30 should not exceed 0.2MPa. When the grouting pressure exceeds the above limit and the grouting volume is less than 2.5L / min, the stabilization time is greater than 5min, or the deformation monitoring reaches the safety alarm value, the grouting is terminated.

[0046] 6. Restoration of the road base. After the first slurry injection is completed, the exposed steel pipes are cut off and the 40% vegetation on the slope is restored.

[0047] Among them, the third step and the fifth step both use a three-in-one monitoring method including automated monitoring, manual electronic leveling, track inspection trolley and track ruler detection to ensure that the uplift or settlement value of the railway roadbed body 20 is within a safe range.

[0048] A second aspect of the embodiment of the present invention provides a railway roadbed, referring to Figures 3 to 6 The railway roadbed includes a railway roadbed body 20, a steel flower pipe 10 and a first grouting body. The steel flower pipe 10 includes a first steel flower pipe 11 and a second steel flower pipe 12. The first steel flower pipe 11 is inserted obliquely toward the bottom of the railway roadbed body 20 from the slope 40 and / or the shoulder 30 of the railway roadbed body 20. The second steel flower pipe 12 is arranged in the railway roadbed body 20 along the vertical direction. The second steel flower pipe 12 is located on the side of the first steel flower pipe 11 away from the center line of the railway roadbed body 20; the first grouting body is formed by injecting the first slurry into the steel flower pipe 10, and the second steel flower pipe 12 and the first grouting body corresponding to the second steel flower pipe 12 form a grouting curtain in the railway roadbed body 20.

[0049] The railway roadbed reinforced by the above-mentioned steel flower pipe grouting reinforcement structure includes a second steel flower pipe 12 located on the outermost side, i.e., away from the center line of the railway road base body 20, and a first grouting body corresponding to the second steel flower pipe 12, and the second steel flower pipe 12 is vertically arranged in the railway road base body 20, forming a barrier on the outside and bottom of the railway road base body 20, with strong structural integrity, preventing the first slurry from flowing to the slope 40, i.e., the first slurry from flowing to the outside of the railway road base body 20, thereby more effectively reinforcing the railway road base body 20.

[0050] In some embodiments, the railway roadbed also includes a second grouting body, which is coated on the outer peripheral side of the pipe mouth of the steel flower pipe 10. The second grouting body is formed by injecting the second slurry into the filling groove on the outer peripheral side of the pipe mouth of the first steel flower pipe 11 and the second steel flower pipe 12. The second grouting body prevents the first slurry from overflowing the overflow hole 13 when it is injected and then flowing out along the wall of the steel flower pipe to the outside of the railway roadbed body 20. The above-mentioned railway roadbed forms a mesh reinforcement structure arranged inside the railway roadbed body 20. The reinforcement effect of the steel flower pipe 10 makes up for the shortcomings of grouting reinforcement and enhances the reliability of the reinforcement effect. Further, the first steel flower pipe 11 and the second steel flower pipe 12 are arranged on opposite sides of the railway roadbed body 20 along the center line. The first steel flower pipe 11 is staggered in the railway roadbed body 20 in a mesh shape, and the angle between the first steel flower pipe 11 and the plane where the bottom of the railway roadbed body 20 is located is 30° to 40°. That is to say, the first steel flower tubes 11 are staggeredly arranged in the railway road base body 20 , which has a stronger reinforcement effect on the railway road base body 20 .

[0051] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered within the protection scope of the present invention. In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A method for grouting reinforcement of steel flower pipes for railway foundation, characterized in that: The following steps are involved: Determine the locations on the railway foundation that require grouting; The steel flower pipe is placed at a position where grouting is required, wherein the steel flower pipe includes a first steel flower pipe and a second steel flower pipe, the first steel flower pipe is inserted obliquely from the side slope and / or shoulder of the railway road base body toward the bottom of the railway road base body; the second steel flower pipe is arranged in the railway road base body along the vertical direction, and the second steel flower pipe is located on the side of the first steel flower pipe away from the center line of the railway road base body; Grouting into the steel flower tube, wherein firstly injecting a first slurry into the second steel flower tube to form a grouting curtain, and then injecting the first slurry into the first steel flower tube; The step of placing the steel flower pipe at the position where grouting is required specifically includes: drilling a grouting hole at the position where grouting is required on the railway base body, and then tamping the steel flower pipe into the grouting hole, wherein the diameter of the grouting hole is less than or equal to the outer diameter of the steel flower pipe; Before the step of injecting grout into the steel flower pipe, filling grooves surrounding the pipe opening are formed on the circumference of the pipe opening of the steel flower pipe, and a second slurry is injected into the filling groove to close the filling groove, and the second slurry is easier to solidify than the first slurry.

2. The railway foundation steel pipe grouting reinforcement method according to claim 1 is characterized in that: The first slurry comprises a mixed solution obtained by adding a polycarboxylate water reducer into cement slurry.

3. The railway foundation steel pipe grouting reinforcement method according to claim 1 is characterized in that: The second slurry comprises a mixture of cement slurry, coarse fiber and water glass; and / or The depth of the filling tank is greater than or equal to 2 meters.

4. The method for grouting reinforcement of steel flower pipes of railway foundation according to any one of claims 1 to 3, characterized in that: The steel flower pipe comprises a plurality of rows of overflow holes and a protective net, each row of the overflow holes is arranged along the length direction of the steel flower pipe, and the protective net is installed at the overflow holes.

5. The railway foundation steel pipe grouting reinforcement method according to any one of claims 1 to 3, characterized in that: The step of injecting the first slurry into the first steel flower tube specifically includes: injecting the first slurry into the first steel flower tube in sequence from the outside of the railway road base body to the center line direction of the railway road base body.

6. A railway roadbed, characterized in that: It comprises a railway road base body, a steel flower pipe and a first grouting body, wherein the steel flower pipe comprises a first steel flower pipe and a second steel flower pipe, wherein the first steel flower pipe is inserted obliquely from the slope and / or shoulder of the railway road base body toward the bottom of the railway road base body, and the second steel flower pipe is arranged in the railway road base body in a vertical direction, and the second steel flower pipe is located on a side of the first steel flower pipe away from the center line of the railway road base body; the first grouting body is formed by injecting a first slurry into the steel flower pipe, and the second steel flower pipe and the first grouting body corresponding to the second steel flower pipe form a grouting curtain in the railway road base body; The step of placing the steel flower pipe at a position where grouting is required specifically comprises: drilling a grouting hole at a position where grouting is required on the railway base body, and then tamping the steel flower pipe into the grouting hole, wherein the diameter of the grouting hole is less than or equal to the outer diameter of the steel flower pipe; The railway roadbed includes a second grouting body, and the second grouting body is coated on the outer peripheral side of the pipe mouth of the steel flower pipe; The second grouting body is formed by injecting the second slurry into the filling grooves on the outer peripheral sides of the pipe openings of the first steel flower pipe and the second steel flower pipe; The second slurry is easier to solidify than the first slurry.

7. The railway roadbed according to claim 6, characterized in that: The outer diameter of the steel flower tube is 38 mm to 45 mm, and the wall thickness is 2 mm to 4 mm.

8. The railway roadbed according to claim 6, characterized in that: The first steel flower tube and the second steel flower tube are arranged on opposite sides of the railway road base body along the center line. The first steel flower tubes are staggered in a grid shape within the railway road base body, and the angle between the first steel flower tube and the plane where the bottom of the railway road base body is located is 25° to 45°.

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