An anti-settlement subway steel pipe segment structure for soft foundation

Abstract

The present invention discloses an anti-settling subway steel pipe segment structure for soft foundation, which relates to the field of subway steel pipe segments, including an axially arranged first pipe segment, wherein the first pipe segment is fixedly connected with a plurality of fixed platforms inclined at both ends, the fixed platforms are hollow and are provided with anti-settling columns inside, the top of the anti-settling columns are connected to the fixed platforms by a connecting structure, the anti-settling columns of adjacent first pipe segments are staggered, the anti-settling columns are arranged with branch pipes at intervals along the length direction, the branch pipes are slidably connected in the anti-settling columns along the radial direction of the anti-settling columns, the anti-settling columns are coaxially slidably connected with hollow plug-in columns, and the plug-in columns are used to push the branch pipes to slide in a direction away from the center of the anti-settling columns. The present invention makes the anti-settling columns between adjacent annular structure steel pipe segments staggered, forms a stable mesh concrete material structure in the stratum, disperses the pressure of the steel pipe segments on the soft foundation, and effectively improves the anti-settling ability of the steel pipe segments on the soft foundation.

Description

Technical Field

[0001] The invention relates to the field of subway steel pipe segments, in particular to an anti-settling subway steel pipe segment structure used for soft foundations. Background Art

[0002] Subway tunnels are engineering structures buried in the ground. The soft soil layers in the ground generally cannot provide sufficient support for subway tunnels. In addition, there may be a large amount of silt in the ground in many areas, which can easily increase the difficulty of shield construction of subway tunnels and control of tunnel line shape.

[0003] A Chinese patent with the relevant announcement number CN114687760A discloses an anti-displacement subway tunnel structure based on a soft foundation, including a subway tunnel surrounded by tunnel segments, and also including a plurality of anti-settlement piles. The tunnel segments are provided with a plurality of pipe pile connection holes, and one end of each anti-settlement pile is sealed and fixedly connected to a pipe pile connection hole. The anti-settlement pile is located outside the subway tunnel.

[0004] With regard to the above-mentioned related technologies, the deadweight of the anti-subsidence column increases significantly after grouting, which is likely to aggravate the settlement of the pipe segment connected thereto to a certain extent. When the pipe segment connected to the anti-subsidence column settles, a gap is likely to occur between the pipe segment and the adjacent pipe segment connected along the circumferential direction, thereby causing problems such as water seepage in the tunnel. In addition, due to the limitation of factors such as insufficient space in the subway tunnel, it is not easy to insert deeper anti-subsidence columns into the stratum during tunnel construction. The contact area between the outer wall of the anti-subsidence column inserted at a shallow depth and the stratum is limited, which increases the deadweight of the pipe segment and is not easy to achieve a good anti-subsidence effect. In summary, the anti-subsidence structure of the existing subway tunnel segment can achieve poor anti-subsidence effect. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an anti-settlement subway steel pipe segment structure for soft foundation, so as to solve the technical problem that the anti-settlement structure of the existing subway tunnel pipe segment can have a poor anti-settlement effect.

[0006] To achieve the above-mentioned purpose, the present invention provides the following technical solutions: an anti-settlement subway steel pipe segment structure for soft foundation, comprising an axially arranged first pipe segment, the first pipe segment is fixedly connected with a plurality of fixed platforms inclined to both ends, the fixed platform is hollow and an anti-settlement column is arranged inside, the top of the anti-settlement column is connected to the fixed platform by a connecting structure, the anti-settlement columns of adjacent first pipe segments are staggered, the anti-settlement columns are arranged with branch pipes at intervals along the length direction, the branch pipes are slidably connected to the anti-settlement column along the radial direction of the anti-settlement column, the anti-settlement column is coaxially slidably connected with a hollow plug column, and the plug column is used to push the branch pipe to slide in a direction away from the center of the anti-settlement column.

[0007] By adopting the above technical solution, the anti-subsidence columns between adjacent annular structural steel pipe segments are staggered to form a stable mesh concrete structure in the stratum, which effectively increases the contact area between the anti-subsidence structure and the stratum, disperses the pressure of the steel pipe segments on the soft foundation, and effectively improves the anti-subsidence ability of the steel pipe segments on the soft foundation.

[0008] The present invention is further configured such that at least one group of fixed platform connection holes are provided at the top of the fixed platform, and anti-settlement column connection holes corresponding to the fixed platform connection holes are provided at the top of the anti-settlement column, and bolts are passed through the fixed platform connection holes and the anti-settlement column connection holes.

[0009] By adopting the above technical solution, the anti-sedimentation column can be stably connected to the fixed platform.

[0010] The present invention is further configured such that a clamping platform is provided at the top of the fixing platform, and a clamping ear is connected to the top of the anti-settling column, and the clamping ear can be clamped in the clamping platform.

[0011] By adopting the above technical solution, the installation speed of the anti-settling column is effectively improved.

[0012] The present invention is further configured such that the top end of the fixing platform is connected with an interface, and the inner diameter of the interface is greater than the diameter of the plug post.

[0013] By adopting the above technical solution, the interface is used to connect the grouting pipe, and the inner diameter of the interface is larger than the diameter of the plug column so that the plug column can be smoothly inserted into the anti-settling column through the interface.

[0014] The present invention is further configured such that a plurality of groups of separators are fixedly connected to the inner wall of the anti-settling column along the length direction, each group of the separators is provided with notches at intervals along the length direction, and a slide groove is provided between the notches, a slider is slidably connected in the slide groove along the radial direction of the anti-settling column, the slider is fixedly connected with a branch pipe along the radial direction of the anti-settling column, the top surface of the slider is an arc surface and is provided with a through hole connecting the branch pipe, and the branch pipe can pass through the anti-settling column.

[0015] By adopting the above technical solution, the branch pipe connected to the slider can smoothly pass through the anti-sedimentation column.

[0016] The present invention is further configured such that the side of the slider facing the inner wall of the anti-settling column can fit with the inner wall of the anti-settling column, and after the plug column is inserted into the anti-settling column, the slider fits with the inner wall of the anti-settling column, and the bottom end of the plug column is an inverted cone structure.

[0017] By adopting the above technical solution, pressure loss in the gap between the outer wall of the branch pipe and the anti-settling column is avoided, so that the concrete material in the anti-settling column can be sprayed out smoothly along the branch pipe.

[0018] The present invention is further configured such that both sides of the first tube segment along the circumferential direction are connected to the second tube segment, the second tube segment along the circumferential direction is connected to the third tube segment on the side away from the first tube segment, and the fourth tube segment is connected between the third tube segments.

[0019] By adopting the above technical solution, multiple steel pipe segment ring structures spliced ​​along the axial direction together form a subway tunnel.

[0020] The present invention is further configured such that the second pipe segment is provided with at least one set of fixing platforms and anti-settling columns facing in opposite directions at a position close to the first pipe segment.

[0021] By adopting the above technical solution, the problem of horizontal slippage in the tunnel at the bend can be avoided.

[0022] The present invention is further configured such that the outer wall of the anti-settling column can be coated with a protective film, and when the protective film is coated on the outer wall of the anti-settling column, a plurality of sliding blocks at the same height along the length direction in the anti-settling column are in contact with each other.

[0023] By adopting the above technical solution, the sliding block in the anti-sedimentation column coated with the protective film is not easily dislodged from its original position due to shaking during the transportation of the anti-sedimentation column.

[0024] In summary, the present invention mainly has the following beneficial effects:

[0025] The present invention arranges an inclined fixed platform structure on the segment structure, inserts anti-settling columns into the soil layer along the direction of the fixed platform, and makes the anti-settling columns between adjacent annular steel segments intertwine with each other. Grouting is performed into the soil layer through the anti-settling columns, and the concrete material injected into the stratum fills the gaps in the stratum and intersects with the concrete material injected into the stratum by the adjacent anti-settling columns, thereby forming a stable mesh structure in the stratum, effectively increasing the contact area between the anti-settling structure and the stratum, dispersing the pressure of the steel segments on the soft foundation, and thus effectively improving the anti-settling ability of the steel segments on the soft foundation.

[0026] The present invention arranges a separator along the length direction of the inner wall of the anti-settlement column, and slides and connects the grouting branch pipe structure that can extend out of the anti-settlement column between the separators at intervals along the length direction. After the anti-settlement column is inserted into the soil layer, the grouting branch pipe structure is pushed out along the radial direction of the anti-settlement column by using the column insertion structure, thereby effectively improving the range and uniformity of grouting of the grouting branch pipe into the formation.

[0027] The present invention occupies the internal space of the anti-settlement column by arranging a hollow plug-in column structure, thereby effectively reducing the weight of the anti-settlement column after grouting, thereby preventing the steel pipe segment from settling due to the gravity of the anti-settlement column after the anti-settlement column is installed;

[0028] The present invention arranges two pairs of fixing platforms with opposite inclination directions on the lowest steel pipe segment, and arranges a pair of fixing platforms with opposite inclination directions on the steel pipe segments adjacent to the steel pipe segment in a ring direction, so that the bottom end and both sides of the steel pipe segment ring are provided with anti-settling structures, which further prevents the tunnel formed by splicing the steel pipe segments from settling on a soft foundation, and at the same time can effectively prevent the steel pipe segments from shifting in the horizontal direction at the bends during the use of the tunnel. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a stereoscopic diagram of the steel pipe segments of the present invention being spliced ​​into a ring structure and connected to an anti-settling pipe;

[0030] Figure 2 For the present invention Figure 1 A magnified view of middle;

[0031] Figure 3 It is a three-dimensional diagram of the steel pipe segments spliced ​​into a ring-shaped structure according to the present invention;

[0032] Figure 4 For the present invention Figure 3 Enlarged view of middle B;

[0033] Figure 5 It is a stereoscopic diagram of two groups of steel pipe segments spliced ​​in an annular structure along the length direction of the tunnel and connected to the anti-settling pipe;

[0034] Figure 6 This is a stereoscopic view of two groups of steel pipe segments spliced ​​in an annular structure along the length direction of the tunnel and connected to the anti-settling pipe from another perspective of the present invention;

[0035] Figure 7 It is a stereoscopic diagram of the internal structure of the anti-sedimentation tube of the present invention;

[0036] Figure 8 This is a three-dimensional diagram of the internal structure of the anti-sedimentation pipe after the plug-in column is pulled out of the present invention;

[0037] Fig. 9 For the present invention Figure 8 Enlarged view of middle C;

[0038] Fig.10 A three-dimensional diagram of the internal structure of the anti-sedimentation column from another perspective of the present invention;

[0039] Fig.11 It is a three-dimensional diagram of the state of the anti-sedimentation column coated with a protective film of the present invention;

[0040] Fig.12 It is a three-dimensional diagram of the internal structure of the anti-sedimentation column of the present invention in a state of being coated with a protective film.

[0041] In the figure: 1. first pipe segment; 2. second pipe segment; 3. third pipe segment; 4. fourth pipe segment; 5. fixed platform; 6. anti-settling column; 7. plug column; 8. slider; 9. branch pipe; 10. clamping platform; 11. clamping ear; 12. fixed platform connection hole; 13. bolt; 14. anti-settling column connection hole; 15. interface; 16. separator; 17. notch; 18. slide groove; 19. branch pipe opening; 20. protective film. DETAILED DESCRIPTION

[0042] The following will be combined with the accompanying drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0043] The following describes an embodiment of the present invention based on its overall structure.

[0044] Embodiment 1

[0045] An anti-settlement subway steel pipe segment structure for soft foundation, such as Figure 1-10 As shown, it includes an axially arranged first pipe segment 1, the first pipe segment 1 is specifically the lowest steel pipe segment in the annular steel pipe segment, the first pipe segment 1 is fixedly connected with a plurality of fixed platforms 5 inclined to both ends, specifically, the first pipe segment 1 is fixedly connected with two groups of fixed platforms 5 inclined to both ends respectively, each group of fixed platforms 5 includes two fixed platforms 5 inclined to both ends, the fixed platforms 5 are hollow and anti-settlement columns 6 are arranged inside, the top of the anti-settlement column 6 is connected to the fixed platform 5 by a connecting structure, specifically, according to the bearing capacity of the foundation of the tunnel, the inclination angle of the anti-settlement column 6 compared with the axis of the annular steel pipe segment is 20-40 degrees, the anti-settlement columns 6 of adjacent first pipe segments 1 are staggered with each other, the anti-settlement columns 6 are spaced apart along the length direction with branch pipes 9, the branch pipes 9 are slidably connected in the anti-settlement column 6 along the radial direction of the anti-settlement column 6, the anti-settlement column 6 is coaxially slidably connected with a hollow plug column 7, the plug column 7 is used to push the branch pipe 9 to slide in a direction away from the center of the anti-settlement column 6.

[0046] See also Figure 1-6 The first pipe segment 1 is connected to the second pipe segment 2 on both sides along the annular direction, the second pipe segment 2 is connected to the third pipe segment 3 on the side away from the first pipe segment 1 along the annular direction, and the fourth pipe segment 4 is connected between the third pipe segments 3. One first pipe segment 1, two second pipe segments 2, two third pipe segments 3 and one fourth pipe segment 4 are all steel pipe segments, which are spliced ​​together to form an annular steel pipe segment ring structure. Multiple steel pipe segment ring structures spliced ​​along the axial direction together form a subway tunnel.

[0047] See also Figure 1-4At least one group of fixed platform connection holes 12 is provided at the top of the fixed platform 5, and anti-settlement column connection holes 14 corresponding to the fixed platform connection holes 12 are provided at the top of the anti-settlement column 6. Bolts 13 pass through the fixed platform connection holes 12 and the anti-settlement column connection holes 14. After the anti-settlement column 6 passes through the fixed platform 5 and is inserted into the stratum, and the plug column 7 is inserted into the anti-settlement column 6, the bolts 13 are used to successively pass through the fixed platform connection holes 12 on one side of the fixed platform 5 and the anti-settlement column connection holes 14 on one side of the anti-settlement column 6 and then pass out from the other side, so as to stably connect the anti-settlement column 6 to the fixed platform 5. An interface 15 is connected to the top of the fixed platform 5. The inner diameter of the interface 15 is larger than the diameter of the plug column 7. The interface 15 is used to connect the grouting pipe, and the inner diameter of the interface 15 is larger than the diameter of the plug column 7, so that the plug column 7 can be smoothly inserted into the anti-settlement column 6 through the interface 15.

[0048] See also Figure 1-4 A clamping platform 10 is provided at the top of the fixed platform 5, and a clamping ear 11 is connected to the top of the anti-subsidence column 6. The clamping ear 11 can be clamped in the clamping platform 10. The clamping platform 10 can limit the depth of the anti-subsidence column 6 inserted into the formation, so that the anti-subsidence column 6 can be quickly inserted into the formation and positioned to a preset depth. At the same time, the clamping ear 11 is clamped in the clamping platform 10 to also play a circumferential positioning effect on the anti-subsidence column 6, so that when the anti-subsidence column 6 is plugged into place, the anti-subsidence column connection hole 14 is synchronously aligned with the fixed platform connection hole 12, which effectively improves the installation speed of the anti-subsidence column 6.

[0049] See also Figure 7-10 , the inner wall of the anti-settling column 6 is fixedly connected with multiple groups of dividing sheets 16 along the length direction, each group of dividing sheets 16 is provided with notches 17 at intervals along the length direction, and a slide groove 18 is provided between the notches 17, the notches 17 are used for concrete material to pass through, a slider 8 is slidably connected in the slide groove 18 along the radial direction of the anti-settling column 6, the slider 8 is fixedly connected with a branch pipe 9 along the radial direction of the anti-settling column 6, the anti-settling column 6 is provided with a branch pipe through-hole 19 for the branch pipe 9 to pass through, the inner diameter of the branch pipe through-hole 19 is the same as the outer diameter of the branch pipe 9, the top surface of the slider 8 is an arc surface and is provided with a through hole connecting the branch pipe 9, the branch pipe 9 can pass through the anti-settling column 6, the slide groove 18 on the dividing sheet 16 serves to provide a sliding guide for the slider 8, and in the process of inserting the column 7 along the axial direction of the anti-settling column 6, the slider 8 slides smoothly along the radius of the anti-settling column 6 away from the axial direction of the anti-settling column 6, so that the branch pipe 9 connected to the slider 8 can pass through the anti-settling column 6 smoothly.

[0050] See also Figure 7-10The side of the slider 8 facing the inner wall of the anti-settlement column 6 can fit with the inner wall of the anti-settlement column 6. After the plug column 7 is inserted into the anti-settlement column 6, the slider 8 fits with the inner wall of the anti-settlement column 6. The bottom end of the plug column 7 is an inverted cone structure. When the slider 8 fits with the inner wall of the anti-settlement column 6, the airtightness between the outer wall of the branch pipe 9 and the anti-settlement column 6 can be effectively improved, avoiding pressure loss in the gap between the outer wall of the branch pipe 9 and the anti-settlement column 6, so that the concrete material in the anti-settlement column 6 can be smoothly sprayed out along the branch pipe 9.

[0051] Embodiment 2

[0052] An anti-settlement subway steel pipe segment structure for soft foundation, such as Figure 1-10 As shown, on the basis of Example 1, the difference from Example 1 is that the second pipe segment 2 is provided with at least one group of fixed platforms 5 and anti-settlement columns 6 facing oppositely at the position close to the first pipe segment 1. Specifically, the anti-settlement columns 6 between adjacent second pipe segments 2 are also in a staggered state. The concrete injected into the stratum from the anti-settlement columns 6 connected to the second pipe segment 2 will flow downward along the stratum gaps due to its own gravity. After the concrete is solidified, a mesh protection structure can be formed on both sides of the tunnel. The anti-settlement columns 6 connected to the second pipe segment 2 can further enhance the anti-settlement ability of the tunnel on the soft foundation while avoiding the problem of horizontal slippage of the tunnel at the bend.

[0053] Embodiment 3

[0054] An anti-settlement subway steel pipe segment structure for soft foundation, such as Figure 1-12 As shown, on the basis of Example 2, the difference from Example 2 lies in that the outer wall of the anti-sedimentation column 6 can be covered with a layer of protective film 20. When the protective film 20 is covered on the outer wall of the anti-sedimentation column 6, a plurality of sliders 8 at the same height along the length direction of the anti-sedimentation column 6 are in contact with each other, and the sliders 8 in the anti-sedimentation column 6 covered with the protective film 20 are not easily dislodged from their original position due to shaking during the transportation of the anti-sedimentation column 6, so that the sliders 8 can slide stably and synchronously during the subsequent insertion of the column 7.

[0055] See also Figure 7-12 During the extension of the branch pipe 9, the protective film 20 can be broken, and the protective film 20 will not affect the normal extension of the branch pipe 9. The branch pipe 9 is in a state of not extending the anti-subsidence column 6 under the restriction of the protective film 20. In this state, the anti-subsidence column 6 can smoothly pass through the fixed platform 5 and be inserted into the formation, effectively avoiding the increase of the resistance of the anti-subsidence column 6 inserted into the formation due to the extension of the branch pipe 9.

[0056] The working principle of the present invention is as follows: the anti-settling column 6 is inserted into the stratum along the fixed platform 5 until the snap-in ear 11 cooperates with the snap-in platform 10, the plug column 7 is inserted into the anti-settling column 6, and the bottom end of the plug column 7 contacts the slider 8. During the process of inserting the plug column 7 into the anti-settling column 6, the slider 8 is pushed in the slide groove 18 and slides in the direction away from the axis of the anti-settling column 6, so that the branch pipe 9 passes through the anti-settling column 6, and then the bolt 13 is used to fix the anti-settling column 6 to the fixed platform 5, the grouting pipe is connected to the interface 15 of the anti-settling column 6, and the concrete enters the anti-settling column 6. After that, the concrete flows downward along the axial direction of the anti-settlement column 6. After passing through the gap 17 between the dividing pieces 16, the concrete flows into the branch pipe 9 through the through hole on the slider 8, and is injected into the stratum from the outlet of the branch pipe 9 to fill the gaps in the stratum. The anti-settlement columns 6 between adjacent steel pipe segments are staggered with each other, and the branch pipes 9 of the anti-settlement columns 6 pass through the grouting to form a stable network structure, which effectively expands the contact area between the anti-settlement structure and the soft foundation, disperses the pressure of the steel pipe segments, and effectively solves the problem of steel pipe segments easily settling on soft foundations.

[0057] Although an embodiment of the present invention has been shown and described, this specific embodiment is only an explanation of the present invention and is not a limitation of the invention. The specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art may make modifications, substitutions and variations to the embodiments without creative contribution as needed without departing from the principles and purpose of the present invention. However, as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. An anti-settling subway steel pipe segment structure for soft foundation, comprising an axially arranged first pipe segment (1), characterized in that: The first pipe segment (1) is fixedly connected with a plurality of fixed platforms (5) inclined at both ends. The fixed platforms (5) are hollow and are provided with anti-settling columns (6) therein. The tops of the anti-settling columns (6) are connected to the fixed platforms (5) by means of a connecting structure. The anti-settling columns (6) of adjacent first pipe segments (1) are staggered with each other. The anti-settling columns (6) are provided with branch pipes (9) at intervals along the length direction. The branch pipes (9) are slidably connected to the anti-settling columns (6) along the radial direction of the anti-settling columns (6). A hollow plug column (7) is coaxially slidably connected to the anti-settling columns (6). The plug column (7) is used to push the branch pipe (9) to slide in a direction away from the center of the anti-settling columns (6). The inner wall of the anti-settling columns (6) is fixedly connected with a plurality of groups of partition sheets (16) along the length direction. ), each group of the separators (16) is provided with notches (17) at intervals along the length direction, and a slide groove (18) is provided between the notches (17), a slider (8) is slidably connected in the slide groove (18) along the radial direction of the anti-settling column (6), the slider (8) is fixedly connected with a branch pipe (9) along the radial direction of the anti-settling column (6), the top surface of the slider (8) is an arc surface and is provided with a through hole connected to the branch pipe (9), the branch pipe (9) can pass through the anti-settling column (6), the side of the slider (8) facing the inner wall of the anti-settling column (6) can fit with the inner wall of the anti-settling column (6), after the plug column (7) is inserted into the anti-settling column (6), the slider (8) fits with the inner wall of the anti-settling column (6), and the bottom end of the plug column (7) is an inverted cone structure.

2. The anti-settling subway steel pipe segment structure for soft foundation according to claim 1, characterized in that: The top of the fixed platform (5) is provided with at least one group of fixed platform connection holes (12), the top of the anti-settling column (6) is provided with anti-settling column connection holes (14) corresponding to the fixed platform connection holes (12), and bolts (13) pass through the fixed platform connection holes (12) and the anti-settling column connection holes (14).

3. The anti-settling subway steel pipe segment structure for soft foundation according to claim 2 is characterized in that: The top of the fixing platform (5) is provided with a clamping platform (10), and the top of the anti-settling column (6) is connected with a clamping ear (11), and the clamping ear (11) can be clamped in the clamping platform (10).

4. The anti-settling subway steel pipe segment structure for soft foundation according to claim 1, characterized in that: The top end of the fixing platform (5) is connected to an interface (15), and the inner diameter of the interface (15) is greater than the diameter of the plug post (7).

5. The anti-settling subway steel pipe segment structure for soft foundation according to claim 1, characterized in that: The first tube segment (1) is connected to the second tube segment (2) on both sides along the annular direction, the second tube segment (2) is connected to the third tube segment (3) on the side away from the first tube segment (1) along the annular direction, and the fourth tube segment (4) is connected between the third tube segments (3).

6. The anti-settling subway steel pipe segment structure for soft foundation according to claim 5, characterized in that: The second pipe segment (2) is provided with at least one set of fixing platforms (5) and anti-settling columns (6) facing in opposite directions at a position close to the first pipe segment (1).

7. The anti-settling subway steel pipe segment structure for soft foundation according to claim 1, characterized in that: The outer wall of the anti-settling column (6) can be coated with a layer of protective film (20). When the protective film (20) is coated on the outer wall of the anti-settling column (6), a plurality of sliding blocks (8) at the same height along the length direction in the anti-settling column (6) contact each other.

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