Reinforcing device for shield tunnel in soft soil layer

Abstract

The invention discloses a soft soil layer shield tunnel reinforcing device which comprises a shield body, at least one guide groove is formed in one side of the shield body, a window is formed in the groove bottom of the guide groove, a grouting pipe is arranged from the window to the inner wall of the tunnel in advance, a semicircular pipe is hinged to the bottom of the grouting pipe, and a guide sliding groove is formed in the outer circle face of the semicircular pipe. A cutting plate is slidably connected into the guide sliding groove. The structure further comprises a prefabricated pipe piece, a limiting groove is formed in the outer arc face of the prefabricated pipe piece, the semicircular pipe and the grouting pipe form a circular pipe state or a triangular supporting state, and the semicircular pipe and the grouting pipe are located in the limiting groove in the triangular supporting state. The device has the advantages that when the semicircular pipe rotates, muck on the moving path of the semicircular pipe is cut off through the cutting plate on the outer side of the semicircular pipe, a triangular cavity is formed, the triangular cavity and a grouting layer between the prefabricated pipe piece and the inner wall of the tunnel form a whole, and therefore deformation and subsidence of a soft soil layer are avoided.

Description

Technical Field

[0001] This invention relates to the field of tunnel reinforcement technology, and in particular to a reinforcement device for shield tunnels in soft soil layers. Background Technology

[0002] To ensure construction safety and minimize the impact of construction on the urban environment, pre-grouting is typically used to reinforce the strata. Grout is injected into the strata before excavation, and through the filling, fracturing, and compaction effects of the grout, the strata are reinforced.

[0003] When a shield tunnel passes through a soft soil layer, it is necessary to stop drilling at an angle at the front end of the shield and insert grouting pipes. Excavation can only continue after the grouting has achieved the expected reinforcement, which affects the construction progress. In addition, the area below the grouting pipe lacks support, the reinforcement structure is scattered, and it cannot form an integral reinforcement with the shield segments. Summary of the Invention

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing a reinforcement device for shield tunnels in weak soil layers, thereby solving the problems existing in the prior art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: A reinforcement device for a shield tunnel in a weak soil layer includes a shield body. At least one guide groove is provided on one side of the shield body. A window is provided at the bottom of the guide groove. A grouting pipe is provided in advance from the window toward the inner wall of the tunnel. A semi-circular pipe is hinged to the bottom of the grouting pipe. A guide groove is provided on the outer surface of the semi-circular pipe. A cutting plate is slidably connected in the guide groove. It also includes precast segments, the outer arc surface of which is provided with a limiting groove, and the semi-circular pipe and the grouting pipe form a circular pipe state or a triangular support state, and in the triangular support state, the segments are limited to being located within the limiting groove.

[0006] Preferably, a guide rail is provided on one side of the guide groove, a vibration slider is provided on the guide rail, and a support rod is fixedly connected to one side of the cutting plate, with the support rod rotatably connected to the vibration slider.

[0007] Preferably, a through groove is provided at the hinge joint of the grouting pipe relative to the semi-circular pipe.

[0008] Preferably, the inner arc surfaces of the semicircular pipe and the grouting pipe are respectively hinged to a connecting rod, and the two connecting rods are hinged together.

[0009] Preferably, a ring is hinged between the two connecting rods, and a grouting plug is provided in the middle of the grouting pipe.

[0010] Preferably, a slag discharge trough is provided at the bottom of the guide trough.

[0011] This invention provides a reinforcement device for shield tunnels in weak soil layers. It has the following beneficial effects: (1) Drill a pipeline from the window into the soil layer of the tunnel outer wall through the drilling rig. Insert a grouting pipe into the pipeline. The semi-circular pipe at the lower end of the grouting pipe can form a triangular support state. During the process of forming the triangular support state, that is, when the semi-circular pipe rotates, the cutting plate on its outer side cuts off the slag on the movement path of the semi-circular pipe to form a triangular cavity. This triangular cavity and the grouting layer between the precast pipe segment and the inner wall of the tunnel form an integral whole. That is, the grout or filling concrete can enter the triangular cavity to form a reinforced body with a stable structure. If there is a weak soil layer in a certain direction of the tunnel, multiple guide grooves are set in the shield body as needed. The above-mentioned reinforcement structure can be formed in each guide groove, thereby avoiding the deformation and subsidence of the weak soil layer.

[0012] (2) An enlarged cavity is formed above the hinge of the semi-circular pipe and the grouting pipe. During subsequent grouting and filling, the grout forms a reinforcing block at the hinge of the semi-circular pipe and the grouting pipe. Two connecting rods are hinged between the semi-circular pipe and the grouting pipe. The two connecting rods are hinged to each other. After the semi-circular pipe is unfolded, it forms a skeleton support on the one hand and plays a skeleton role in the reinforced body on the other hand, so the reinforcement effect is more prominent. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the basic structure of the present invention; Figure 2 This is a schematic diagram of the shield structure after partial cross-section; Figure 3 yes Figure 2 A magnified view of point E in the image; Figure 4 This is a schematic diagram of the connection structure between the grouting pipe and the semi-circular pipe of the present invention; Figure 5 This is a schematic diagram of the separation structure of the semi-circular tube and the cutting plate of the present invention; Figure 6 This is a schematic diagram of the tunnel reinforcement structure of the present invention. Detailed Implementation

[0014] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0015] Example 1 Please see Figures 1 to 6This invention provides a technical solution: a reinforcement device for a shield tunnel in soft soil layer, including a shield body 1, at least one guide groove 2 is provided on one side of the shield body 1, the guide groove 2 is provided on the side or top surface of the shield body 1, used for reinforcement of soft soil at the top or side of the tunnel, a window 3 is provided at the bottom of the guide groove 2, and a grouting pipe 4 is provided ahead of the tunnel inner wall through the window 3. The advanced grouting reinforcement is to install the grouting pipe obliquely in front of the shield body 1. The drilling rig drills a hole into the soil layer of the outer wall of the tunnel through the window 3, and inserts the grouting pipe 4 into the pipeline. The grouting method is the prior art. The bottom of the grouting pipe 4 is hinged to a semi-circular pipe 5. A guide groove 51 is provided on the outer surface of the semi-circular pipe 5. A cutting plate 52 is slidably connected in the guide groove 51. A slag discharge groove 21 is provided at the bottom of the guide groove 2. The slag formed by cutting is collected and discharged by the conveyor belt below. When the semi-circular pipe 5 rotates, the cutting plate 52 on its outer side cuts off the slag on the moving path of the semi-circular pipe 5, forming a triangular cavity. It also includes precast segments 6, with a limiting groove 61 set on the outer arc surface of the precast segments 6. The semi-circular pipe 5 and the grouting pipe 4 form a circular pipe state or a triangular support state. The circular pipe state is convenient for insertion into the drill hole formed by the drilling machine, and the triangular support state is limited to being located in the limiting groove 61.

[0016] A guide rail 7 is provided on one side of the guide groove 2, and a vibration slider 71 is provided on the guide rail 7. The vibration slider 71 slides back and forth on the guide rail 7 by a vibration motor. A support rod 72 is fixedly connected to one side of the cutting plate 52. The support rod 72 and the vibration slider 71 are rotatably connected by a threaded pin. The threaded pin can be easily disassembled for replacing and installing the next grouting pipe 4.

[0017] This invention drills a pipeline from window 3 into the soil layer of the tunnel outer wall using a drilling rig. A grouting pipe 4 is inserted into the pipeline. The semi-circular pipe 5 at the lower end of the grouting pipe 4 can form a triangular support state. During the formation of the triangular support state, that is, when the semi-circular pipe 5 rotates, the cutting plate 52 on its outer side cuts off the slag in the movement path of the semi-circular pipe 5, forming a triangular cavity. This triangular cavity forms an integral whole with the grouting layer between the precast segment 6 and the inner wall of the tunnel. That is, the grout or filling concrete can enter the triangular cavity to form a reinforced body 10 with a stable structure. If there is a weak soil layer in a certain direction of the tunnel, multiple guide grooves 2 are set in the shield body 1 as needed. The above-mentioned reinforced structure can be formed in each guide groove 2, thereby avoiding deformation and subsidence of the weak soil layer.

[0018] Furthermore, during the rotation and support of the semi-circular pipe 5, the grouting pipe 4 remains stationary in its original position, allowing the shield body 1 to advance forward (carrying the semi-circular pipe 5). Once the semi-circular pipe 5 has rotated to its position, the vibrating slider 71 separates from the cutting plate 52, and the cutting plate 52 is pulled out for the installation of the next grouting pipe 4. The lower end of the already installed grouting pipe 4 is supported by the bottom of the guide groove 2, providing a certain support effect. The shield body 1 can advance without needing to achieve 100% reinforcement strength, thus accelerating construction efficiency. The already installed grouting pipe 4 eventually enters the limiting groove 61 of the precast segment 6, forming further support and thereby further improving the support effect.

[0019] Example 2 like Figures 1 to 6 As shown, based on Example 1, a through groove 8 is provided at the hinge joint of the grouting pipe 4 and the semi-circular pipe 5, such as... Figure 6 As shown, during the movement of the semicircular pipe 5, the length of the hypotenuse L is greater than the vertical height H, so the upper end of the cutting plate 52 passes through the through groove 8, forming an enlarged cavity above the hinge of the semicircular pipe 5 and the grouting pipe 4. During subsequent grouting and filling, the grout forms a reinforcing block 20 at the hinge of the semicircular pipe 5 and the grouting pipe 4, which further improves the reinforcement effect.

[0020] Example 3 like Figures 1 to 6 As shown, the inner arc surfaces of the semicircular pipe 5 and the grouting pipe 4 are respectively hinged to a connecting rod 9. The two connecting rods 9 are hinged to each other. After the semicircular pipe 5 is unfolded, it forms a skeleton support on the one hand, and plays a skeleton role in the solidified body 10 on the other hand.

[0021] A ring 91 is hinged between the two connecting rods 9. A grouting plug 92 is set in the middle of the grouting pipe 4. When the two connecting rods 9 are folded inside the grouting pipe 4, the ring 91 avoids passing through the insertion pipe. After the insertion pipe is connected to the grouting plug 92, high-pressure grouting reinforcement is formed for the soft soil layer at a distance.

[0022] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A reinforcement device for a shield tunnel in a weak soil layer, comprising a shield body (1), wherein at least one guide groove (2) is provided on one side of the shield body (1), and a window (3) is provided at the bottom of the guide groove (2), and a grouting pipe (4) is provided in advance from the window (3) toward the inner wall of the tunnel, characterized in that: The bottom of the grouting pipe (4) is hinged to a semi-circular pipe (5), and a guide groove (51) is provided on the outer surface of the semi-circular pipe (5). A cutting plate (52) is slidably connected inside the guide groove (51). It also includes precast segments (6), the outer arc surface of the precast segments (6) is provided with a limiting groove (61), the semi-circular pipe (5) and the grouting pipe (4) form a circular pipe state or a triangular support state, and in the triangular support state, it is located in the limiting groove (61).

2. The reinforcement device for shield tunnels in weak soil layers according to claim 1, characterized in that: A guide rail (7) is provided on one side of the guide groove (2), and a vibration slider (71) is provided on the guide rail (7). A support rod (72) is fixedly connected to one side of the cutting plate (52), and the support rod (72) is rotatably connected to the vibration slider (71).

3. The reinforcement device for shield tunnels in weak soil layers according to claim 1, characterized in that: A through groove (8) is provided at the hinge of the grouting pipe (4) relative to the semi-circular pipe (5).

4. The reinforcement device for shield tunnels in weak soil layers according to claim 1, characterized in that: The inner arc surfaces of the semicircular pipe (5) and the grouting pipe (4) are respectively hinged to a connecting rod (9), and the two connecting rods (9) are hinged to each other.

5. The reinforcement device for shield tunnels in weak soil layers according to claim 4, characterized in that: A ring (91) is hinged between the two connecting rods (9), and a grouting plug (92) is provided in the middle of the grouting pipe (4).

6. The reinforcement device for shield tunnels in weak soil layers according to claim 1, characterized in that: The bottom of the guide groove (2) is provided with a slag discharge groove (21).

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