Reinforcement method for railway reinforced subgrade and railway settlement subgrade

Abstract

The present invention provides a method for strengthening a railway subgrade and a railway settlement subgrade. The railway strengthened subgrade includes a subgrade body, tracks arranged on the subgrade body, a plurality of existing strengthening piles, a plurality of bag grouting piles, and a first grouting pipe. At least part of the bag grouting piles are arranged at the arrival and departure lines of the tracks, and the bag grouting piles are arranged staggeredly with the existing strengthening piles; first grouting pipes are arranged on both sides of the bag grouting piles, and one end of each first grouting pipe is inserted into the filler layer in the subgrade body. The railway strengthened subgrade rectifies the settlement subgrade of the railway by arranging bag grouting piles at the tracks, has good strengthening effect, flexible pile position arrangement, and small construction machinery and equipment used; and first grouting pipes are respectively arranged on both sides of the bag grouting piles, and the filler layer of the subgrade body near the bag grouting piles after embedding is strengthened by grouting into the first grouting pipes.

Description

Technical Field

[0001] The present invention relates to the technical field of railway construction, and particularly relates to a method for reinforcing a railway subgrade and a sunken railway subgrade. Background Art

[0002] Deep soft soils deposited by lacustrine facies and marine facies are widely distributed in the coastal areas of our country. Generally, they have characteristics such as large natural water content, high compressibility, low bearing capacity, and low shear strength. When building high-speed railway stations in these areas, in order to ensure the stability of the station construction site, reduce the post-construction settlement and differential settlement of the subgrade, and ensure the safe and stable operation of trains, it is often necessary to comprehensively reinforce the soft soil layer in the foundation. However, due to various factors, the originally designed foundation treatment methods often fail to achieve the expected reinforcement effect, resulting in different degrees of differential settlement or large post-construction settlement and other diseases in existing high-speed railway stations after several years of operation, affecting the operation safety of high-speed trains. Therefore, there is an urgent need to study a comprehensive treatment technology that has less impact on the operation of existing high-speed railway stations, has good treatment effects, and is economically feasible. Summary of the Invention

[0003] The present invention provides a method for reinforcing a railway subgrade and a sunken railway subgrade to solve the technical problem of post-construction settlement of existing operating high-speed railway stations.

[0004] To achieve the above object, the technical solution of the present invention is realized as follows:

[0005] The present invention provides a railway reinforced subgrade, including a subgrade body, tracks arranged on the subgrade body, a plurality of existing reinforcement piles, a plurality of bag grouting piles, and a first grouting pipe. At least part of the bag grouting piles are arranged at the arrival and departure lines of the tracks, and the bag grouting piles are staggered from the existing reinforcement piles; the first grouting pipes are arranged on both sides of the bag grouting piles, and one end of the first grouting pipe is inserted into the filler layer in the subgrade body.

[0006] Further, the first grouting pipes on both sides of the bag grouting piles are symmetrically arranged; and / or, the diameter of the first grouting pipe is 0.01m - 0.03m.

[0007] Further, the railway reinforced subgrade further includes a platform arranged on the subgrade body. At least part of the bag grouting piles are arranged at the platform. The existing reinforcement piles include a plurality of prestressed pipe piles, and the prestressed pipe piles are arranged at the main line inside the station of the tracks; the subgrade body has a plurality of stress relief holes filled with gravel. The stress relief holes are arranged between the prestressed pipe piles and the bag grouting piles located at the platform, and the stress relief holes are arranged on the side close to the bag grouting piles.

[0008] Furthermore, a plurality of the stress relief holes are arranged at intervals along the longitudinal direction of the track.

[0009] Furthermore, the diameter of the stress relief holes is 0.2 m to 0.4 m.

[0010] Furthermore, a plurality of the bag grouting piles are arranged at intervals along the longitudinal direction of the track, and the distance between two adjacent bag grouting piles is 1.2 m to 1.4 m.

[0011] Furthermore, the reinforced railway subgrade includes a medium-coarse sand cushion layer, and the medium-coarse sand cushion layer is laid on the tops of the bag grouting piles at the track; the medium-coarse sand cushion layer is located in the filling layer of the subgrade body.

[0012] Furthermore, the reinforced railway subgrade includes a graded crushed stone cushion layer, and the graded crushed stone cushion layer is laid on the tops of the bag grouting piles at the platform; the graded crushed stone cushion layer is located in the filling layer of the subgrade body.

[0013] According to another aspect of the present invention, there is also provided a method for reinforcing a railway settlement subgrade, including the following steps: arranging a plurality of bag grouting piles at the arrival and departure lines of the subgrade body of the settlement subgrade, so that the bag grouting piles are arranged staggeredly with the existing reinforced piles; respectively arranging first grouting pipes on both sides of the bag grouting piles, and inserting one end of the first grouting pipe into the filling layer of the subgrade body; grouting into the first grouting pipe to reinforce the filling layer.

[0014] Furthermore, it further includes the following steps: arranging a plurality of bag grouting piles at the platform of the subgrade body, so that the bag grouting piles are arranged staggeredly with the existing reinforced piles; arranging a plurality of stress relief holes between the bag grouting piles and the prestressed pipe piles of the existing reinforced piles at the platform, and making the stress relief holes located on the side close to the bag grouting piles.

[0015] Furthermore, before the step of respectively arranging first grouting pipes on both sides of the bag grouting piles and inserting one end of the first grouting pipe into the filling layer of the subgrade body, it further includes the following steps: excavating at least part of the filling of the filling layer; laying a medium-coarse sand cushion layer on the tops of the bag grouting piles at the arrival and departure lines of the track; filling the excavated filling back above the medium-coarse sand cushion layer.

[0016] Furthermore, before the step of respectively arranging first grouting pipes on both sides of the bag grouting piles and inserting one end of the first grouting pipe into the filling layer of the subgrade body, it further includes the following steps: excavating at least part of the filling of the filling layer; laying a graded crushed stone cushion layer on the tops of the bag grouting piles at the platform; filling the excavated filling back above the graded crushed stone cushion layer.

[0017] The railway reinforced subgrade provided by the present invention rectifies the settlement subgrade of the railway by arranging bag grouting piles at the track, has good reinforcement effect, flexible pile position arrangement, and small construction machinery and equipment used; and first grouting pipes are respectively arranged on both sides of the bag grouting piles, and the filler layer of the subgrade body near the bag grouting piles after being buried is reinforced by grouting into the first grouting pipes.

[0018] The reinforcement method for the railway settlement subgrade of the present invention is fast in construction near the existing railway tracks, has little influence on the existing reinforcement measures, and can effectively and quickly complete the treatment of the settlement subgrade diseases. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a schematic structural diagram of the railway reinforced subgrade provided by the embodiment of the present invention;

[0020] Figure 2 is Figure 1 a schematic structural diagram of the bag grouting pile shown in ;

[0021] Figure 3 is Figure 1 a schematic diagram of an arrangement mode of the bag grouting pile shown in ;

[0022] Figure 4 is Figure 1 a schematic diagram of another arrangement mode of the bag grouting pile shown in.

[0023] DESCRIPTION OF THE REFERENCE NUMERALS:

[0024] 10, platform; 20, track; 30, existing reinforcement pile; 31, prestressed pipe pile;

[0025] 40, bag grouting pile; 41, second grouting pipe; 50, first grouting pipe;

[0026] 60, subgrade body; 61, filler layer; 62, stress release hole; 63, medium coarse sand cushion layer; 64, graded gravel cushion layer; 65, bearing stratum. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] The present invention will be further described in detail below with reference to the drawings and specific embodiments. In the description of the present invention, the relevant orientation or positional relationship is based on Figure 2 the orientation or positional relationship shown, wherein, "top" and "bottom" refer to Figure 2 the top and bottom directions of. It should be understood that these orientation terms are only for the convenience of describing the present invention and are simplified descriptions, rather than indicating or implying 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 a limitation to the present invention.

[0028] In addition, descriptions such as "first" and "second" in the present invention are for descriptive purposes only, and should not be construed as indicating or implying their relative importance or implicitly specifying the quantity or order of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, the meaning of "a plurality" is at least two, such as two, three, etc., unless otherwise specifically defined.

[0029] Referring to Figure 1 , in a first aspect of the embodiments of the present application, a railway reinforced subgrade is provided, which includes a subgrade body 60, tracks 20 arranged on the subgrade body 60, a plurality of existing reinforcement piles 30, a plurality of bag grouting piles 40, and a first grouting pipe 50. At least part of the bag grouting piles 40 are arranged at the arrival and departure lines of the tracks 20, and the bag grouting piles 40 are arranged staggeredly with the existing reinforcement piles 30; first grouting pipes 50 are arranged on both sides of the bag grouting piles 40, and one end of the first grouting pipe 50 is inserted into the filler layer 61 in the subgrade body 60.

[0030] The embodiments of the present application take a railway station as an example to illustrate the reasons for subgrade settlement and the reinforcement treatment measures for the settlement subgrade. Generally, the subgrade of a railway station includes a subgrade body, a platform, tracks, and a plurality of existing reinforcement piles. The platform and tracks are respectively arranged on the subgrade body. A plurality of existing reinforcement piles are respectively arranged in the subgrade corresponding to the platform and tracks to reinforce the subgrade body at the platform and track locations.

[0031] Tracks usually include main lines and arrival and departure lines. Among them, the main line is the track for trains to pass directly through the station without stopping; the arrival and departure line is the track for trains to stop when entering and leaving the station. Referring to Figure 1 , the subgrade body 60 at the main line of the track 20 and at least part of the subgrade body 60 of the platforms 10 on both sides of the main line of the track 20 need to have a relatively large bearing capacity. Generally, prestressed pipe piles 31 are arranged in the subgrade body 60 at this location to prevent the subgrade body 60 from settling at this location. In addition, the subgrade body 60 of a railway station is generally reinforced with flexible piles such as MMP piles or jet grouting piles. Referring to Figure 1 . Due to various factors, after several years of operation of the railway station, these existing reinforcement piles 30, especially the foundation reinforcement methods of flexible piles, will have different degrees of uneven settlement or large post-construction settlement and other diseases, seriously affecting the normal operation of the railway station.

[0032] The railway reinforced subgrade provided by the embodiment of the present application is provided with a plurality of bag grouting piles 40 in the subgrade body 60 at the arrival and departure lines 20 of the track. The bag grouting piles 40 are arranged staggeredly with the existing reinforcement piles 30 to reinforce the subgrade body 60 at the arrival and departure lines 20 of the track. The pile positions can be arranged flexibly, the construction machinery and equipment used are small, the construction is fast, the influence on the existing reinforcement measures is small, and the subgrade body 60 can be effectively and quickly reinforced.

[0033] In the embodiment of the present application, a plurality of bag grouting piles 40 are arranged between the existing reinforcement piles 30 such as MMP piles or jet grouting piles. During construction, if it happens to be at the position of the existing reinforcement pile 30, the drilling position is adjusted longitudinally along the track 20 to avoid it. Specifically, generally, the distance for longitudinally adjusting the drilling position is half of the pile spacing of the MMP pile or jet grouting pile, so as to avoid the existing reinforcement pile 30. After adjustment, for the conflict holes that have been constructed, cement fly ash slurry can be injected for grouting backfill. When the slurry loss is serious, a quick-setting agent is incorporated or concrete is used for backfill. In some embodiments, a plurality of bag grouting piles 40 are arranged at intervals longitudinally along the track 20, and the spacing between two adjacent bag grouting piles 40 is 1.2 m to 1.4 m. Refer to Figure 3 , Figure 4 , the bag grouting piles 40 arranged at intervals along the extending direction of the track 20 can be arranged to avoid the existing reinforcement piles 30, and the reinforcement effect on the subgrade body 60 along the extending direction of the track 20 is uniform and effective. That is to say, a plurality of bag grouting piles 40 are arranged in rows, and each row of bag grouting piles 40 extends longitudinally along the track 20. Each bag grouting pile 40 and other adjacent bag grouting piles 40 around it are distributed in a triangular or square shape.

[0034] For the railway reinforced subgrade of the embodiment of the present application, first grouting pipes 50 are arranged on both sides of the bag grouting piles 40, and one end of the first grouting pipe 50 is inserted into the filling layer 61 of the subgrade body 60. By grouting into the first grouting pipe 50, the filling layer 61 of the subgrade body 60 near the buried bag grouting piles 40 is reinforced to prevent the collapse of the filling layer 61 of the subgrade body 60 on the periphery of the bag grouting piles 40. Further, the first grouting pipes 50 on both sides of the bag grouting piles 40 are symmetrically arranged. Refer to Figure 2 . The symmetrically arranged first grouting pipes 50 make the reinforcement of the filling layer 61 of the subgrade body 60 on the periphery of the bag grouting piles 40 uniform and have a good reinforcement effect. Specifically, the diameter of the first grouting pipe 50 is 0.01 m to 0.03 m. In addition, 3 grouting holes are arranged circumferentially at intervals of 0.5 m longitudinally on the first grouting pipe 50 to meet the grouting requirements for the filling layer 61.

[0035] In addition, after settlement occurs in the arrival and departure track 20 of a railway station, it will affect the nearby platform 10, or under the combined influence of various factors, cause the platform 10 to tilt. Therefore, it is necessary to reinforce the side of the platform 10 close to the arrival and departure track. In the embodiment of the present application, the railway reinforced subgrade further includes a platform 10 provided on the subgrade body 60. At least part of the bag grouting piles 40 are provided at the platform 10. The existing reinforcement piles 30 include a plurality of prestressed pipe piles 31, and the prestressed pipe piles 31 are provided at the main line within the station of the track 20. The subgrade body 60 has a plurality of stress relief holes 62, and the stress relief holes 62 are filled with gravel. A stress relief hole 62 is provided between the prestressed pipe pile 31 and the bag grouting pile 40 located at the platform 10, and the stress relief hole 62 is provided on the side close to the bag grouting pile 40.

[0036] Understandably, in order to prevent the platform 10 near the arrival and departure track 20 from tilting, bag grouting piles 40 are arranged on the side of the platform 10 close to the arrival and departure track to reinforce the platform 10. Similar to the method of arranging bag grouting piles 40 at the track 20, they should be staggered from the existing reinforcement piles 30, and a plurality of bag grouting piles 40 are arranged in rows, and each row of bag grouting piles 40 extends longitudinally along the track 20. In addition, a plurality of stress relief holes 62 are provided between the bag grouting piles 40 and the prestressed pipe piles 31 at the platform 10, and the stress relief holes 62 are provided on the side close to the bag grouting piles 40, which can reduce the influence of the construction of the bag grouting piles 40 at the platform 10 on the prestressed pipe piles 31, that is, reduce the influence of the construction on the main line of the track 20. Specifically, the plurality of stress relief holes 62 are arranged at intervals longitudinally along the track 20. Understandably, each row of bag grouting piles 40 extends longitudinally along the track 20, so the stress relief holes 62 also extend along the arrangement direction of each row of bag grouting piles 40 to reduce the influence of the construction on the main line of the track 20 to a greater extent. Specifically, the diameter of the stress relief holes 62 is 0.2 m to 0.4 m.

[0037] In some embodiments, the railway reinforced subgrade includes a medium-coarse sand cushion layer 63, and the medium-coarse sand cushion layer 63 is laid on the top of the bag grouting piles 40 at the track 20; the medium-coarse sand cushion layer 63 is located in the filling layer 61 of the subgrade body 60. Laying the medium-coarse sand cushion layer 63 on the top of the bag grouting piles 40 can prevent the subgrade body 60 from collapsing at the track 20 where the bag grouting piles 40 are buried, and further enhance the reinforcement effect. Further, the medium-coarse sand cushion layer 63 includes medium-coarse sand and multiple layers of geogrids, and the multiple layers of geogrids are arranged at intervals in the medium-coarse sand. Specifically, the filling at the top of the bag grouting piles 40 at the track 20 is excavated, and the geogrids can be set to two layers. After the geogrids and the medium-coarse sand are alternately laid, the filling is backfilled. For example, 5 cm thick medium-coarse sand + geogrid + 10 cm thick medium-coarse sand + geogrid + 5 cm thick medium-coarse sand, and both ends of the geogrid are folded back 3 m respectively to wrap and fix the medium-coarse sand, so as to prevent the medium-coarse sand from moving and reducing its reinforcement effect. Further, the fineness modulus of the medium-coarse sand in the medium-coarse sand cushion layer 63 is 1.6 to 3.7, and the thickness of the medium-coarse sand cushion layer 63 is 0.1 m to 0.3 m.

[0038] In other embodiments, the railway reinforced subgrade includes a graded crushed stone cushion layer 64, and the graded crushed stone cushion layer 64 is laid on the top of the bag grouting piles 40 at the platform 10; the graded crushed stone cushion layer 64 is located in the filling layer 61 of the subgrade body 60. Laying the graded crushed stone cushion layer 64 on the top of the bag grouting piles 40 can prevent the subgrade body 60 from collapsing at the platform 10 where the bag grouting piles 40 are buried, and further enhance the reinforcement effect. Further, the graded crushed stone cushion layer 64 includes graded crushed stone and a geogrid, and the geogrid is arranged at the bottom of the graded crushed stone. Specifically, the filling at the top of the bag grouting piles 40 at the platform 10 is excavated, the geogrid is laid on the top of the bag grouting piles 40, about 0.3 m thick graded crushed stone is laid on the geogrid, and then the filling is backfilled.

[0039] In the second aspect of the embodiments of the present application, a method for reinforcing a railway settlement subgrade is further provided, including the following steps: arranging a plurality of bag grouting piles 40 at the arrival and departure lines of the track 20 of the subgrade body 60 of the settlement subgrade, so that the bag grouting piles 40 are staggered from the existing reinforcement piles 30; respectively arranging first grouting pipes 50 on both sides of the bag grouting piles 40, and inserting one end of the first grouting pipes 50 into the filling layer 61 of the subgrade body 60; grouting into the first grouting pipes 50 to reinforce the filling layer 61.

[0040] It can be understood that bag grouting piles 40 are set at the section from track 20 to the departure line where the roadbed settlement disease occurs, so as to reinforce the roadbed body 60 at the section from track 20 to the departure line. For railway stations, the location where the roadbed settlement disease occurs is generally at the section from track 20 to the departure line, so bag grouting piles 40 are set here for reinforcement. Bag grouting piles 40 include a second grouting pipe 41 and a geotextile bag tied to the outside of the second grouting pipe 41. The second grouting pipe 41 is filled with geotextile bags by small pressure grouting. After the geotextile bags are fully filled, they can fully fill the gaps around the bag grouting piles 40 and the top collapse of the roadbed body 60. The final grouting condition is that the pressure reaches the final injection pressure (≥0.3MPa), and the continuous grouting volume for 5 minutes is not more than 5L / min. When the slurry is lost too quickly, a quick-setting agent such as water glass can be added. In the embodiment of the present application, the diameter of the bag grouting pile 40 is 0.35m to 0.4m, and the length of the bag grouting pile 40 is not less than 0.5m to 1.0m through the bearing layer 65 of the road base body 60. A plurality of bag grouting piles 40 are arranged in rows, and each row of bag grouting piles 40 extends along the longitudinal direction of the track 20. Each bag grouting pile 40 and other bag grouting piles 40 adjacent to its peripheral side are distributed in a triangular or square shape.

[0041] In the embodiment of the present application, a plurality of bag grouting piles 40 are arranged between existing reinforcement piles 30 such as MMP piles or jet grouting piles. If the existing reinforcement piles 30 are located at the same position during construction, the drilling position is adjusted longitudinally along the track 20 to avoid the existing reinforcement piles 30. Specifically, the distance of the longitudinal adjustment of the drilling position is generally half of the distance between the MMP piles or the jet grouting piles, so that the existing reinforcement piles 30 can be avoided.

[0042] In addition, a first grouting pipe 50 is respectively provided on both sides of the bag grouting pile 40, and one end of the first grouting pipe 50 is inserted into the filling layer 61 of the road base body 60. Grouting is injected into the first grouting pipe 50 to reinforce the filling layer 61 of the road base body 60 near the buried bag grouting pile 40, so as to prevent the filling layer 61 of the road base body 60 on the side of the bag grouting pile 40 from collapsing.

[0043] In some embodiments, the following steps are also included: a plurality of bag-grouting piles 40 are arranged at the platform 10 of the road base body 60, so that the bag-grouting piles 40 and the existing reinforcement piles 30 are staggered; a plurality of stress release holes 62 are arranged between the bag-grouting piles 40 at the platform 10 and the prestressed pipe piles 31 of the existing reinforcement piles 30, and the stress release holes 62 are located on the side close to the bag-grouting piles 40.

[0044] It can be understood that the road base body 60 on the side of the main line of the track 20 station of the platform 10 is arranged with prestressed pipe piles 31, and the probability of settlement is small. The road base body 60 on the side of the track 20 to the departure line of the platform 10 is generally arranged with flexible piles such as MMP piles or rotary jet piles, which are prone to settlement, and at this time, the platform 10 wall of the platform 10 will be tilted or settled. The bag grouting piles 40 are arranged on the road base body 60 on the side close to the departure line at the platform 10, which can improve the tilt disease of the platform 10 wall at the platform 10. The bag grouting piles 40 are staggered with the existing reinforcement piles 30. In order to reduce the impact of the construction of the bag grouting piles 40 at the platform 10 on the main line of the track 20 station, a plurality of stress release holes 62 are set between the bag grouting piles 40 and the prestressed pipe piles 31 at the platform 10, and the stress release holes 62 are arranged close to one side of the bag grouting piles 40. A plurality of stress release holes 62 are arranged along the longitudinal direction of the track 20 to ensure that the construction of the bag grouting piles 40 in the extension direction of the track 20 has no influence on the main line of the track 20. The stress release holes 62 are filled with crushed stones. The diameter of the stress release holes 62 is generally 0.2m to 0.4m.

[0045] In some embodiments, the first grouting pipe 50 is respectively provided on both sides of the bag grouting pile 40, and before the step of inserting one end of the first grouting pipe 50 into the filling layer 61 of the road base body 60, the following steps are also included: digging away at least part of the filling material of the filling layer 61; laying a medium-coarse sand cushion layer 63 on the top of the bag grouting pile 40 from the track 20 to the departure line; and filling the excavated filling material back to the top of the medium-coarse sand cushion layer 63. In other embodiments, the first grouting pipe 50 is respectively provided on both sides of the bag grouting pile 40, and before the step of inserting one end of the first grouting pipe 50 into the filling layer 61 of the road base body 60, the following steps are also included: digging away at least part of the filling material of the filling layer 61; laying a graded gravel cushion layer 64 on the top of the bag grouting pile 40 at the platform 10; and filling the excavated filling material back to the top of the graded gravel cushion layer 64.

[0046] In the embodiment of the present application, the medium-coarse sand cushion layer 63 is laid on the top of the bag-grouted piles 40 to avoid the collapse of the road base body 60 at the track 20 where the bag-grouted piles 40 are buried, and further enhance the reinforcement effect. Furthermore, the medium-coarse sand cushion layer 63 includes medium-coarse sand and multiple layers of geogrids, and the multiple layers of geogrids are arranged in the medium-coarse sand at intervals. Specifically, the filler on the top of the bag-grouted piles 40 at the track 20 is excavated, and the geogrid can be set to two layers. After the geogrid and the medium-coarse sand are laid alternately, the filler is backfilled. For example, 5 cm thick medium-coarse sand + geogrid + 10 cm thick medium-coarse sand + geogrid + 5 cm thick medium-coarse sand, and the two ends of the geogrid are folded back 3m respectively to cover and fix the medium-coarse sand to prevent the medium-coarse sand from moving and reducing its reinforcement effect. Furthermore, the fineness modulus of the medium-coarse sand in the medium-coarse sand cushion layer 63 is 1.6-3.7, and the thickness of the medium-coarse sand cushion layer 63 is 0.1 m-0.3 m.

[0047] In the embodiment of the present application, the graded broken stone cushion 64 is laid on the top of the bag grouting pile 40 to prevent the roadbed body 60 at the platform 10 where the bag grouting pile 40 is buried from collapsing, and further enhance the reinforcement effect. Further, the graded broken stone cushion 64 includes graded broken stone and geogrid, and the geogrid is arranged at the bottom of the graded broken stone. Specifically, the filler at the top of the bag grouting pile 40 at the platform 10 is removed, the geogrid is laid on the top of the bag grouting pile 40, graded broken stone with a thickness of about 0.3 m is laid on the geogrid, and then the filler is backfilled.

[0048] In addition, in the embodiment of the present application, during the construction process of the bag grouting pile 40, settlement and displacement monitoring and early warning are carried out on the track 20, the settlement, displacement deformation amount and its development trend of the track 20 are dynamically monitored, settlement and displacement deformation control standards and early warning schemes are formulated, and corresponding emergency treatment measures are started according to the early warning scheme to ensure the safety of construction and railway operation.

[0049] As mentioned above, the above is only the specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art can easily think of changes or substitutions within the technical scope disclosed by the present invention, and all should be covered by the protection scope of the present invention. Moreover, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that those skilled in the art can implement it. When the combination of technical solutions results in contradictions 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 required by the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims

1. A railway reinforced subgrade, characterized in that: it includes a subgrade body, tracks arranged on the subgrade body, a plurality of existing reinforcement piles, a plurality of bag grouting piles, and a first grouting pipe. At least part of the bag grouting piles are arranged at the arrival and departure lines of the tracks, and the bag grouting piles are arranged staggeredly with the existing reinforcement piles; the first grouting pipes are arranged on both sides of the bag grouting piles, and one end of the first grouting pipe is inserted into the filler layer in the subgrade body.

2. The railway reinforced subgrade according to claim 1, characterized in that the first grouting pipes on both sides of the bag grouting piles are symmetrically arranged; and / or the diameter of the first grouting pipe is 0.01m to 0.03m.

3. The railway reinforced subgrade according to claim 1, characterized in that the railway reinforced subgrade further includes a platform arranged on the subgrade body. At least part of the bag grouting piles are arranged at the platform. The existing reinforcement piles include a plurality of prestressed pipe piles, and the prestressed pipe piles are arranged at the main line within the station of the tracks; the subgrade body has a plurality of stress relief holes filled with gravel. The stress relief holes are arranged between the prestressed pipe piles and the bag grouting piles located at the platform, and the stress relief holes are arranged on the side close to the bag grouting piles.

4. The railway reinforced subgrade according to claim 3, characterized in that the plurality of stress relief holes are arranged at intervals along the longitudinal direction of the tracks.

5. The railway reinforced subgrade according to claim 3, characterized in that the diameter of the stress relief hole is 0.2m to 0.4m.

6. The railway reinforced subgrade according to any one of claims 1 to 5, characterized in that the plurality of bag grouting piles are arranged at intervals along the longitudinal direction of the tracks, and the distance between two adjacent bag grouting piles is 1.2m to 1.4m.

7. The railway reinforced subgrade according to any one of claims 1 to 5, characterized in that the railway reinforced subgrade includes a medium-coarse sand cushion layer, and the medium-coarse sand cushion layer is laid on the top of the bag grouting piles at the tracks; the medium-coarse sand cushion layer is located in the filler layer of the subgrade body.

8. The railway reinforced subgrade according to any one of claims 3 to 5, characterized in that the railway reinforced subgrade includes a graded crushed stone cushion layer, and the graded crushed stone cushion layer is laid on the top of the bag grouting piles at the platform; the graded crushed stone cushion layer is located in the filler layer of the subgrade body.

9. A method for reinforcing a railway settlement subgrade, characterized in that it includes the following steps: arranging a plurality of bag grouting piles at the arrival and departure lines of the tracks of the subgrade body of the settlement subgrade, so that the bag grouting piles are arranged staggeredly with the existing reinforcement piles; respectively arranging first grouting pipes on both sides of the bag grouting piles, and inserting one end of the first grouting pipe into the filler layer of the subgrade body; injecting grout into the first grouting pipe to reinforce the filler layer.

10. The reinforcement method according to claim 9, characterized in that it further includes the following steps: A plurality of bag grouting piles are arranged at the platform of the subgrade body, so that the bag grouting piles are staggered from the existing reinforcement piles; A plurality of stress relief holes are arranged between the bag grouting piles and the prestressed pipe piles of the existing reinforcement piles at the platform, and the stress relief holes are located on one side close to the bag grouting piles.

11. The reinforcement method according to claim 9, characterized in that, before the step of respectively arranging first grouting pipes on both sides of the bag grouting piles and inserting one end of the first grouting pipes into the filling layer of the subgrade body, the following steps are further included: Dig away at least part of the filling of the filling layer; Lay a medium-coarse sand cushion layer on the top of the bag grouting piles at the arrival and departure lines of the tracks; Fill the dug filling back above the medium-coarse sand cushion layer.

12. The reinforcement method according to claim 10, characterized in that, before the step of respectively arranging first grouting pipes on both sides of the bag grouting piles and inserting one end of the first grouting pipes into the filling layer of the subgrade body, the following steps are further included: Dig away at least part of the filling of the filling layer; Lay a graded broken stone cushion layer on the top of the bag grouting piles at the platform; Fill the dug filling back above the graded broken stone cushion layer.

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