Steel sleeve grouting reinforcement device for settlement control of subway tunnel in water-rich soft soil stratum

Abstract

The utility model discloses a steel sleeve grouting reinforcement device for settlement control of a subway tunnel in a water-rich soft soil stratum, which belongs to the technical field of subway tunnel reinforcement, comprises a shield tunnel segment, and is characterized in that a connecting steel pipe is sleeved on the shield tunnel segment, a plurality of splicing steel pipes are mounted at the bottom end of the connecting steel pipe in a threaded manner, and the splicing steel pipes are connected with the shield tunnel segment. A conical head is installed at the bottom end of the bottommost assembled steel pipe in a threaded mode, and a grouting mechanism is arranged on the shield tunnel segment. According to the utility model, the fixing rings, the springs, the arc-shaped push blocks and the insertion plates are arranged in the plurality of assembled steel pipes, and when the steel sleeve assembled by the plurality of assembled steel pipes, the connecting steel pipe and the conical head extends into the soft soil layer, the insertion plates in the inner cavities of the assembled steel pipes are sequentially driven to extend into the soft soil layer outside the assembled steel pipes through the expansion of the annular air bag; therefore, the connecting strength between the assembled steel pipe and the soft soil layer is improved, and the practicability of the device is improved.

Description

Technical Field

[0001] This utility model relates to the field of subway tunnel reinforcement technology, and more specifically, to a steel casing grouting reinforcement device for subway tunnel settlement control in water-rich soft soil strata. Background Technology

[0002] Water-rich soft soil is a type of roadbed geological condition with excessive water content, which often leads to problems such as quicksand, piping, and base heave. Water-rich soft soil strata are a common geological phenomenon in tunnel construction, requiring a series of technical measures to address them.

[0003] A search revealed that invention patent CN103573274A discloses a steel casing grouting reinforcement device for controlling settlement of shield tunnels in soft soil foundations. The device involves burying shield tunnel segments in the soil, placing grouting equipment inside the segments, and vertically burying one end of a steel casing composed of multiple TAM units connected in series. A pile tip is installed at the bottom of the steel casing, and the upper end of the steel casing passes through a grouting hole on the shield tunnel segment and connects to a connector. The connector is fixed to the inner wall of the shield tunnel segment. One end of the grouting pipe is connected to the grouting equipment, and the other end is inserted into the steel casing. This patent uses the grouting holes on the shield tunnel segments to press the steel casing into the soil beneath the tunnel. The TAM units on the steel casing can grout the surrounding soil at any burial depth, thus forming a grouting zone around the steel casing. The steel casing and the grouting zone can then be considered as a micro-pillar, connected to the tunnel segments via the connector, to reinforce the shield tunnel and control the settlement of the tunnel segments.

[0004] However, the above patent still has the following shortcomings: when the outer side of the foundation is soft soil, the grout connection strength between the steel pipe sleeve and the soil is not good, which affects the reinforcement effect. To this end, we have proposed a steel sleeve grouting reinforcement device for controlling settlement of subway tunnels in water-rich soft soil strata. Utility Model Content

[0005] In view of the problems existing in the prior art, the purpose of this utility model is to provide a steel casing grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata.

[0006] To solve the above problems, the present invention adopts the following technical solution:

[0007] A grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata includes shield tunnel segments. A connecting steel pipe is fitted onto the shield tunnel segment. Multiple assembled steel pipes are threaded onto the bottom end of the connecting steel pipe. A conical head is threaded onto the bottom end of the lowest assembled steel pipe. A grouting mechanism is provided on the shield tunnel segment. Multiple external through-grooves are formed on the outer side of the assembled steel pipe. A fixing ring is fixedly fitted onto the inner wall of the assembled steel pipe. Multiple internal through-grooves are formed on the outer side of the fixing ring. Multiple sets of springs are fixedly connected to the inner wall of the fixing ring. Arc-shaped push blocks are fixedly connected to the ends of the multiple sets of springs. Insert plates are fixedly connected to the outer sides of the multiple arc-shaped push blocks. The ends of the multiple insert plates are movably fitted into the inner cavities of the internal through-grooves. Multiple grout-permeable holes are formed at the ends of the insert plates. The ends of the grout-permeable holes are connected to the inner surfaces of the arc-shaped push blocks.

[0008] As a preferred embodiment of this utility model, the grouting mechanism includes a mobile vehicle placed on the tunnel lining segments of a shield tunnel. A grouting pump is installed on the top surface of the mobile vehicle. A grouting pipe is fixedly connected to the output end of the grouting pump. The bottom end of the grouting pipe is movably sleeved into the inner cavity of multiple assembled steel pipes. An annular airbag is fixedly sleeved on the side of the bottom end of the grouting pipe. An electrically controlled valve is fixedly installed on the top surface of the annular airbag. A camera is installed on the side of the bottom end of the grouting pipe. An air pump is installed on the top of the grouting pump. A one-way valve is fixedly installed on the output end of the air pump. An air inflation pipe is fixedly connected to the end of the one-way valve. The bottom end of the air inflation pipe is fixedly sleeved into the inner cavity of the annular airbag.

[0009] As a preferred embodiment of this utility model, a mounting frame is fixedly connected to the top surface of the mobile vehicle, and a control panel is fixedly installed on the side of the top of the mounting frame.

[0010] As a preferred embodiment of this utility model, the inner sides of the bottom ends of the assembled steel pipe and the connecting steel pipe are provided with internal thread grooves, and the top ends of the assembled steel pipe and the conical head are provided with external thread grooves, and the external thread grooves and the internal thread grooves are compatible with each other.

[0011] In a preferred embodiment of this utility model, the positions of the inner through groove and the outer through groove correspond to each other.

[0012] In a preferred embodiment of this utility model, the side of the air-filling pipe is connected to the side of the grouting pipe.

[0013] Compared with existing technologies, the advantages of this utility model are:

[0014] In this invention, a fixing ring, a spring, an arc-shaped pusher, and an insert plate are installed in multiple assembled steel pipes. When the multiple assembled steel pipes, connecting steel pipes, and conical head assembled steel sleeves are inserted into the soft soil layer, the expansion of the annular air bladder sequentially drives the insert plate inside the assembled steel pipe to extend into the soft soil layer outside the assembled steel pipe, thereby increasing the connection strength between the assembled steel pipes and the soft soil layer. In addition, grout is injected into the inner cavity of the assembled steel pipes sequentially through a grouting pump and grouting pipe. The solidification of the grout fixes the arc-shaped pusher and the insert plate. Furthermore, the grout can overflow from the grouting hole to the outside of the assembled steel pipe, thereby reinforcing the assembled steel pipes, the insert plate, and the soft soil layer, ensuring the reinforcement effect of the steel sleeve on the shield tunnel segments. This device has good practicality. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0016] Figure 2 This is a schematic cross-sectional view of the present invention;

[0017] Figure 3 This is a schematic diagram of the assembled steel pipe structure of this utility model;

[0018] Figure 4 This is a schematic diagram of the structure of the fixing ring of this utility model;

[0019] Figure 5 This is a breakdown diagram of the connecting steel pipe, the assembled steel pipe, and the conical head of this utility model;

[0020] Figure 6 This is a schematic diagram of the grouting mechanism of this utility model.

[0021] Explanation of the labels in the diagram:

[0022] 1. Shield tunnel segment; 2. Connecting steel pipe; 3. Assembled steel pipe; 4. Conical head; 5. Grouting mechanism; 6. External through groove; 7. Fixing ring; 8. Internal through groove; 9. Spring; 10. Arc-shaped push block; 11. Insert plate; 12. Grouting hole; 13. Mobile vehicle; 14. Grouting pump; 15. Grouting pipe; 16. Annular airbag; 17. Air pump; 18. One-way valve; 19. Air inflator; 20. Camera; 21. Electrically controlled valve; 22. Mounting frame; 23. Control panel; 24. External threaded groove; 25. Internal threaded groove. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present utility model without creative effort are within the scope of protection of the present utility model.

[0024] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "top / bottom," etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0026] Example:

[0027] Please see Figure 1-6 A grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata includes a shield tunnel segment 1, a connecting steel pipe 2 sleeved on the shield tunnel segment 1, multiple assembled steel pipes 3 threaded at the bottom end of the connecting steel pipe 2, a conical head 4 threaded at the bottom end of the lowest assembled steel pipe 3, a grouting mechanism 5 on the shield tunnel segment 1, multiple external through grooves 6 on the outer side of the assembled steel pipes 3, a fixing ring 7 fixedly sleeved on the inner wall of the assembled steel pipes 3, multiple internal through grooves 8 on the outer side of the fixing ring 7, multiple sets of springs 9 fixedly connected to the inner wall of the fixing ring 7, arc-shaped push blocks 10 fixedly connected to the ends of the multiple sets of springs 9, insert plates 11 fixedly connected to the outer side of the multiple arc-shaped push blocks 10 respectively, the ends of the multiple insert plates 11 movably sleeved into the inner cavity of the internal through grooves 8, multiple grouting holes 12 opened at the ends of the insert plates 11, and the ends of the grouting holes 12 communicating with the inner side of the arc-shaped push blocks 10.

[0028] In this embodiment, the fixing ring 7 is fixed to the inner cavity of the assembled steel pipe 3 by welding, and the end of the insert plate 11 is provided with an inclined angle to ensure that the insert plate 11 is smoothly inserted into the soft soil layer.

[0029] For details, please refer to Figure 1 and Figure 6 The grouting mechanism 5 includes a mobile vehicle 13 placed on the shield tunnel segment 1. A grouting pump 14 is installed on the top surface of the mobile vehicle 13. A grouting pipe 15 is fixedly connected to the output end of the grouting pump 14. The bottom end of the grouting pipe 15 is movably sleeved into the inner cavity of multiple assembled steel pipes 3. An annular airbag 16 is fixedly sleeved on the side of the bottom end of the grouting pipe 15. An electric control valve 21 is fixedly installed on the top surface of the annular airbag 16. A camera 20 is installed on the side of the bottom end of the grouting pipe 15. An air pump 17 is installed on the top of the grouting pump 14. A one-way valve 18 is fixedly installed on the output end of the air pump 17. An air inflator 19 is fixedly connected to the end of the one-way valve 18. The bottom end of the air inflator 19 is fixedly sleeved into the inner cavity of the annular airbag 16.

[0030] In this embodiment, the one-way valve 18 can only allow the air pump 17 and the air pipe 19 to introduce gas into the inner cavity of the annular airbag 16. The electric control valve 21 is used to discharge the gas in the annular airbag 16. When the annular airbag 16 expands, it is located inside the multiple arc-shaped push blocks 10. The expanded annular airbag 16 pushes the arc-shaped push blocks 10 and the insert plate 11 to move outward so that the insert plate 11 can be inserted into the soft soil layer from the inner through groove 8 and the outer through groove 6. The input end of the grout pump 14 is connected to the grout supply through a pipe.

[0031] For details, please refer to Figure 2 and Figure 6 A mounting bracket 22 is fixedly connected to the top surface of the mobile vehicle 13, and a control panel 23 is fixedly installed on the side of the top of the mounting bracket 22.

[0032] In this embodiment, the device is controlled by the control panel 23, and the camera 20 is viewed by the control panel 23 to control the position of the bottom end of the grouting pipe 15 extending into the inner cavity of the assembled steel pipe 3.

[0033] For details, please refer to Figure 1 , Figure 3 and Figure 5 The inner sides of the bottom of the assembled steel pipe 3 and the connecting steel pipe 2 are provided with internal thread grooves 25, and the top of the assembled steel pipe 3 and the tapered head 4 are provided with external thread grooves 24. The external thread grooves 24 and the internal thread grooves 25 are compatible.

[0034] In this embodiment, the connection between the connecting steel pipe 2 and the assembled steel pipe 3, the assembled steel pipe 3 and the assembled steel pipe 3, and the conical head 4 are achieved through the cooperation of the internal thread groove 25 and the external thread groove 24.

[0035] For details, please refer to Figure 1 , Figure 3 and Figure 4 The position of the inner through groove 8 corresponds to the position of the outer through groove 6.

[0036] In this embodiment, the insert plate 11 is ensured to extend into the underground soft soil layer through the inner through groove 8 and the outer through groove 6.

[0037] For details, please refer to Figure 6 The side of the air inflator 19 is connected to the side of the grouting pipe 15.

[0038] In this embodiment, the process of the grouting pipe 15 extending into the inner cavity of the connecting steel pipe 2 and the assembled steel pipe 3 is ensured to drive the air inflator 19 to extend into the inner cavity of the connecting steel pipe 2 and the assembled steel pipe 3.

[0039] Working principle: During construction, holes are first drilled in the shield tunnel segment 1 for inserting connecting steel pipes 2, assembled steel pipes 3, and conical heads 4. The conical head 4 is inserted into the soft soil layer through the holes. Multiple assembled steel pipes 3 are installed above the conical head 4 through the cooperation of the external thread groove 24 and the internal thread groove 25, so that multiple assembled steel pipes 3 are inserted into the soft soil layer. A connecting steel pipe 2 is installed at the top of the uppermost assembled steel pipe 3, so that the top of the connecting steel pipe 2 is connected to the shield tunnel segment 1. Then, the grouting pipe 1 is inserted. 5. Insert the grouting pipe 15 into the inner cavity of the connecting steel pipe 2 and multiple assembled steel pipes 3, and move the annular airbag 16 on the side of the grouting pipe 15 to the inner side of the multiple arc-shaped push blocks 10 inside the inner cavity fixing ring 7 of the lowest assembled steel pipe 3. At this time, use the air pump 17 to inject air into the inner cavity of the annular airbag 16 through the one-way valve 18 and the air pipe 19, so that the annular airbag 16 expands and pushes the arc-shaped push blocks 10 and the insert plate 11 outward, so that the end of the insert plate 11 passes through the inner through groove 8 and the outer through groove 6 and extends to the side of the assembled steel pipe 3. In the soft soil layer, the air pump 17 is then turned off, and the electric control valve 21 is opened to release the air from the annular airbag 16. The insert plate 11 continues to be inserted into the soil. At this time, the grouting pipe 15 and the annular airbag 16 are lifted and moved upward, so that the annular airbag 16 moves to the inside of the multiple arc-shaped push blocks 10 inside the inner cavity fixing ring 7 of the upper assembled steel pipe 3. The annular airbag 16 is inflated again through the air pump 17, the one-way valve 18 and the air inflating pipe 19, so that the insert plate 11 is inserted into the soft soil layer. In addition, the grouting pump 14 is started to... External grout is injected into the two assembled steel pipes 3 below through grouting pipe 15, thereby fixing the arc-shaped push block 10 and the insert plate 11 with grout. At the same time, grout can overflow to the outside of the assembled steel pipe 3 through the grouting hole 12, connecting the insert plate 11 and the soft soil layer. Finally, the grouting pipe 15 is lifted upwards in sequence, and the insert plate 11 is inserted into the soft soil layer in sequence to increase the connection strength between the assembled steel pipe 3 and the soft soil layer. Grouting is then performed on multiple assembled steel pipes 3 and connecting steel pipes 2.

[0040] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model based on the technical solution and its improved concept should be covered within the protection scope of the present utility model.

Claims

1. A steel casing grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata, comprising shield tunnel segments (1), characterized in that: A connecting steel pipe (2) is fitted onto the shield tunnel segment (1). Multiple assembled steel pipes (3) are threaded onto the bottom end of the connecting steel pipe (2). A conical head (4) is threaded onto the bottom end of the lowest assembled steel pipe (3). A grouting mechanism (5) is provided on the shield tunnel segment (1). Multiple external through grooves (6) are opened on the outer side of the assembled steel pipe (3). A fixing ring (7) is fixedly fitted onto the inner wall of the assembled steel pipe (3). Multiple internal through grooves are opened on the outer side of the fixing ring (7). The groove (8) has multiple sets of springs (9) fixedly connected to the inner wall of the fixing ring (7). The ends of the multiple sets of springs (9) are fixedly connected to arc-shaped push blocks (10). The outer sides of the multiple arc-shaped push blocks (10) are respectively fixedly connected to insert plates (11). The ends of the multiple insert plates (11) are respectively movably sleeved into the inner cavity of the inner through groove (8). The ends of the insert plates (11) are provided with multiple through holes (12). The ends of the through holes (12) are connected to the inner side of the arc-shaped push blocks (10).

2. The grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata according to claim 1, characterized in that: The grouting mechanism (5) includes a mobile vehicle (13) placed on the shield tunnel segment (1). A grouting pump (14) is installed on the top surface of the mobile vehicle (13). A grouting pipe (15) is fixedly connected to the output end of the grouting pump (14). The bottom end of the grouting pipe (15) is movably sleeved into the inner cavity of multiple assembled steel pipes (3). An annular airbag (16) is fixedly sleeved on the side of the bottom end of the grouting pipe (15). An electric control valve (21) is fixedly installed on the top surface of the 16), a camera (20) is provided on the side of the bottom end of the grouting pipe (15), an air pump (17) is provided on the top of the grouting pump (14), a one-way valve (18) is fixedly installed at the output end of the air pump (17), an air inflator (19) is fixedly connected to the end of the one-way valve (18), and the bottom end of the air inflator (19) is fixedly sleeved into the inner cavity of the annular airbag (16).

3. The grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata according to claim 2, characterized in that: The top surface of the mobile vehicle (13) is fixedly connected to a mounting bracket (22), and a control panel (23) is fixedly installed on the side of the top of the mounting bracket (22).

4. The grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata according to claim 1, characterized in that: The inner sides of the bottom ends of the assembled steel pipe (3) and the connecting steel pipe (2) are provided with internal thread grooves (25), and the top ends of the assembled steel pipe (3) and the conical head (4) are provided with external thread grooves (24). The external thread grooves (24) and the internal thread grooves (25) are compatible.

5. The grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata according to claim 1, characterized in that: The position of the inner through groove (8) corresponds to the position of the outer through groove (6).

6. The grouting reinforcement device for settlement control of subway tunnels in water-rich soft soil strata according to claim 2, characterized in that: The side of the air inflator (19) is connected to the side of the grouting pipe (15).

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