Single-ring shield tunnel segment floating test device

Abstract

The utility model relates to the technical field of single-ring shield tunnel segment floating test equipment, in particular to a single-ring shield tunnel segment floating test device which comprises a model box, a shield tail gap simulation assembly, a simulation segment, a segment adjacent ring action simulation system and a floating detection system. A shield tail gap simulation assembly is arranged in the containing cavity, a simulation duct piece is arranged in the shield tail gap simulation assembly, the two sides of the simulation duct piece are connected with the duct piece adjacent ring action simulation systems respectively, and a floating detection system is arranged on the simulation duct piece; the duct piece grouting floating process in the actual shield tunnel construction process can be truly simulated, grout is injected into the gap between the simulated shield tail gap and the simulated duct piece, the grout is fluid at the beginning, floating occurs due to the fact that the buoyancy borne by the duct piece is larger than the gravity of the duct piece, and the floating detection system monitors and records the floating displacement of the duct piece in real time.

Description

Technical Field

[0001] The utility model relates to the technical field of single-ring shield tunnel segment floating test equipment, in particular to a single-ring shield tunnel segment floating test device. Background Art

[0002] During shield tunneling, segments are pre-assembled and positioned within the shield shell. The shield machine then advances under the thrust of hydraulic jacks, gradually releasing the segments from the shield tail. Due to the thickness of the shield shell, a gap between the segments and the surrounding soil remains. If this gap is not promptly filled, the surrounding soil will collapse due to loss of support, causing ground subsidence and adversely impacting surface infrastructure and buildings. Grouting is performed around the shield tail as the shield machine advances to fill this gap.

[0003] After grouting, the slurry takes time to solidify. Before solidification, the slurry is in a fluid state with a high density. The segments are surrounded by the fluid. Because the segments are hollow cylinders, the buoyancy they experience in the fluid slurry is greater than their own weight, causing them to float. This floating segment-induced risk of segment misalignment and leaks in pipe seams is increasing during the construction of large-diameter shield tunnels.

[0004] The existing segment floating simulation device has the following deficiencies: there is a lack of research on the floating process of a single ring segment in the synchronous grouting slurry after it escapes from the tail of the shield machine. The patent document with application number 202311169875.X discloses a device and method for simulating the floating test of a rectangular shield tunnel segment, a lining structure is attached to the inner wall of the shield structure, and the lining structure includes a plurality of segment rings arranged at intervals along the longitudinal direction and having a rectangular cross-section; a synchronous grouting system for simulating tunnel grouting construction, and the synchronous grouting includes a method for grouting the gap between the segment ring and the stratum. The invention relates to a grouting pipe comprising a grouting frame, a grouting frame and a grouting pipe arranged along the longitudinal length and fixed on the shield structure; a propulsion system for simulating the thrust during shield tunneling, the propulsion system comprising a plurality of push rods fixed to the shield structure at radial intervals and pressed against the simulated segment ring; a measuring structure, the measuring structure comprising a measuring frame fixed on a formation simulation box away from the propulsion system, and a displacement meter for monitoring the floating amount of the segment, the measuring frame being located outside the formation simulation box and forming a cantilever extending into the lining structure, the displacement meter being fixed on the cantilever. Utility Model Content

[0005] In order to solve the above technical problems existing in the prior art, the utility model provides a single-ring shield tunnel segment floating test device.

[0006] In order to achieve the above-mentioned purpose, the utility model proposes a single-ring shield tunnel segment floating test device, comprising: a model box, a simulated shield tail gap component, a simulated segment, a segment adjacent ring action simulation system, and a floating detection system. The interior of the model box is provided with a accommodating cavity, and the cross-section of the model box is a hollow rectangular structure without a top plate. The accommodating cavity of the model box is provided with the simulated shield tail gap component, and the simulated segment is provided with the simulated shield tail gap component. The simulated shield tail gap component and the simulated segment are concentrically arranged, and the two sides of the simulated segment are respectively connected to the segment adjacent ring action simulation system, and the simulated segment is provided with the floating detection system; the segment adjacent ring action simulation system is used to simulate the interaction between the segment and its adjacent rings in actual shield tunnel construction; the floating detection system is used to measure the floating displacement of the segment. The system simulates the actual segment grouting and floating process during shield tunnel construction. Grout is injected into the gap between the simulated shield tail and the simulated segment. Initially, the grout is fluid, and the buoyancy of the segment is greater than its own weight, causing it to float. The floating detection system monitors and records the segment's floating displacement in real time. By understanding the segment's floating behavior, it provides a scientific basis for floating control and construction parameter optimization during shield tunnel construction.

[0007] As an optional embodiment, in the ring shield tunnel segment floating test device provided by the present invention, the simulated shield tail gap assembly includes a circular cylinder and a support. The simulated segment is arranged inside the circular cylinder. The inner diameter of the circular cylinder is larger than the outer diameter of the simulated segment. Both ends of the circular cylinder are provided with openings. The circular cylinder is fixed to the bottom of the model box via two supports. The simulated segment is inside the circular cylinder, and at the initial moment, the circular cylinder is concentric with the simulated segment. The inner diameter of the circular cylinder is larger than the outer diameter of the simulated segment, so that there is a gap of a certain thickness between the circular cylinder and the simulated segment for filling slurry. By providing the circular cylinder and the support, the circular cylinder is fixed in the simulation box, thereby limiting the simulated segment from floating up and down inside the circular cylinder, so as to facilitate the simulated floating test.

[0008] As an optional embodiment, in the ring shield tunnel segment flotation test device provided by the present invention, the simulated segment is a cylindrical structure with closed ends and a hollow interior. The simulated segment is a cylindrical structure with closed ends and a hollow interior, which facilitates the installation of a flotation detection system to detect the flotation degree of the simulated segment. The hollow interior of the simulated segment reduces its own weight, allowing for a more realistic simulation of the flotation degree of a single ring shield tunnel segment after grouting, and making it easier to achieve flotation.

[0009] As an optional implementation scheme, in the ring shield tunnel segment floating test device provided by the present invention, the segment adjacent ring action simulation system includes an elastic part and a fixed part, one end of the elastic part is connected to the simulated segment, and the other end is connected to the fixed part, and the fixed part is fixed to the bottom of the model box. By setting the elastic part and the fixed part, the simulated segment can be set concentrically with the simulated shield tail gap assembly at the initial position, the two ends of the elastic part are respectively connected to the simulated segment end and the fixed part end, and the other end of the fixed part is fixed to the bottom of the model box, ensuring that the elastic part can provide a stable reaction force when the simulated segment floats, simulating the mechanical constraint between adjacent rings. The elastic part has a certain amount of deformation at the initial moment. During the experiment, when the simulated segment floats under the action of buoyancy, the spring limits the floating of the simulated segment, simulating the close connection and support between adjacent segment rings in actual construction.

[0010] As an optional implementation scheme, in the ring shield tunnel segment floating test device provided by the present invention, the floating detection system includes a limit rod, a limit rod mounting portion, a sliding portion, a displacement meter and a displacement meter mounting rod. The limit rod mounting portion is provided on the side of the simulated segment, the limit rod is inserted into the limit rod mounting portion, the limit rod passes through the sliding portion and contacts the displacement meter, the limit rod can move up and down through the sliding portion, the displacement meter is connected to the displacement meter mounting rod, the displacement meter mounting rod is connected to the model box, and the sliding portion is fixedly connected to the inner wall of the model box through a connecting rod. When the simulated segment begins to float due to the buoyancy it receives, the limit rod moves upward with the simulated segment, the sliding portion ensures that the limit rod can only move in the vertical direction, and the displacement meter in contact with the top of the limit rod monitors and records the vertical floating amount of the simulated segment in real time. The displacement meter mounting rod is fixedly connected to the model box to ensure that the displacement meter is always in a stable state during the test.

[0011] As an optional embodiment, in the ring shield tunnel segment floatation test device provided by the present invention, the sliding portion includes a housing and a ball bearing. The housing is vertically arranged and coaxial with the limiting rod. The ball bearing is disposed within the housing. The limiting rod moves vertically within the housing via the ball bearing. The housing is connected to the connecting rod. By providing the sliding portion, the simulated segment is restricted from moving up and down along the sliding portion.

[0012] As an optional embodiment, in the ring shield tunnel segment floatation test device provided by the present invention, the displacement meter includes a slidable sensing probe that contacts the top of a limit rod. The sensing probe, in contact with the top of the limit rod, and the displacement meter monitor and record the vertical floatation of the simulated segment in real time.

[0013] Compared with the prior art, the beneficial effects of the technical solution of the present invention are as follows: the present invention provides a ring shield tunnel segment floating test device, which is provided by setting a model box, a simulated shield tail gap component, a simulated segment, a segment adjacent ring action simulation system, and a floating detection system. The interior of the model box is provided with a accommodating cavity, and the cross-section of the model box is a hollow rectangular structure without a top plate. The accommodating cavity of the model box is provided with a simulated shield tail gap component, and the simulated shield tail gap component is provided with a simulated segment. The two sides of the simulated segment are respectively connected to the segment adjacent ring action simulation system, and the simulated segment is provided with a floating detection system; the segment adjacent ring action simulation system is used to simulate the interaction between the segment and its adjacent rings in actual shield tunnel construction; the detection system is used to measure the floating displacement of the segment; it can truly simulate the segment grouting floating process during actual shield tunnel construction, and inject slurry into the gap between the simulated shield tail gap and the simulated segment. Initially, the slurry is fluid, and the buoyancy of the segment is greater than its own gravity, thereby floating. The floating detection system monitors and records the floating displacement of the segment in real time. By understanding the floating rules of the segments, a scientific basis is provided for floating control and construction parameter optimization in shield tunnel construction. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0015] Figure 1 A schematic diagram of the structure of the ring shield tunnel segment floating test device provided by the utility model;

[0016] Figure 2 A schematic top view of the ring shield tunnel segment floating test device provided by the utility model;

[0017] Figure 3 A schematic diagram of the structure of a segment adjacent ring action simulation system of a ring shield tunnel segment floating test device provided by the present invention;

[0018] Figure 4 The floating detection system of the ring shield tunnel segment floating test device provided by the utility model;

[0019] Figure 5 It is a schematic diagram of the top view of the sliding part.

[0020] [Description of Reference Numerals]

[0021] 1. Model box; 11. Accommodating cavity; 2. Simulated shield tail gap assembly; 21. Circular cylinder; 22. Support; 3. Simulated segment; 4. Simulation system of the action of adjacent rings of the segment; 41. Elastic part; 42. Fixed part; 5. Floating detection system; 51. Limit rod; 52. Limit rod mounting part; 53. Sliding part; 531. Housing; 532. Ball; 54. Displacement meter; 541. Induction probe; 55. Displacement meter mounting rod; 56. Connecting rod. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0023] It should be noted that all directional indications in the embodiments of the present invention, such as first, second, up, down, left, right, front, back, etc., are only used to explain the relative position relationship, movement status, etc. between the various components in a certain specific posture as shown in the accompanying drawings. If the specific posture changes, the directional indication will also change accordingly.

[0024] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0025] The utility model provides a single ring shield tunnel segment floating test device, such as Figure 1-Figure 5As shown, it includes: a model box 1, a simulated shield tail gap component 2, a simulated pipe segment 3, a pipe segment adjacent ring action simulation system 4, and a floating detection system 5. The interior of the model box 1 is provided with a accommodating cavity 11. The cross section of the model box 1 is a hollow rectangular structure without a top plate. The accommodating cavity 11 of the model box 1 is provided with the simulated shield tail gap component 2, and the simulated pipe segment 3 is provided in the simulated shield tail gap component 2. The simulated shield tail gap component 2 and the simulated pipe segment 3 are concentrically arranged. The two sides of the simulated pipe segment 3 are respectively connected to the pipe segment adjacent ring action simulation system 4, and the simulated pipe segment 3 is provided with the floating detection system 5; the pipe segment adjacent ring action simulation system 4 is used to simulate the interaction between the pipe segment and its adjacent rings in actual shield tunnel construction; the floating detection system 5 is used to measure the floating displacement of the pipe segment. The system can realistically simulate the grouting and floating process of segments during actual shield tunnel construction. Slurry is injected into the gap between the simulated shield tail and the simulated segment 3. Initially, the slurry is fluid, and the buoyancy of the segment is greater than its own weight, causing it to float. The floating detection system 5 monitors and records the floating displacement of the segment in real time. By understanding the floating patterns of the segment, a scientific basis is provided for floating control and construction parameter optimization during shield tunnel construction.

[0026] like Figure 2 As shown, in the ring shield tunnel segment floating test device provided by the present invention, the simulated shield tail gap assembly 2 includes a circular cylinder 21 and a support 22. The simulated segment 3 is arranged in the circular cylinder 21. The inner diameter of the circular cylinder 21 is larger than the outer diameter of the simulated segment 3. Both ends of the circular cylinder 21 are provided with openings. The circular cylinder 21 is fixed to the bottom of the model box 1 through two supports 22. The simulated segment 3 is inside the circular cylinder 21, and at the initial moment, the circular cylinder 21 is concentric with the simulated segment 3. The inner diameter of the circular cylinder 21 is larger than the outer diameter of the simulated segment 3, so that there is a gap of a certain thickness between the circular cylinder 21 and the simulated segment 3 for filling slurry. By providing the circular cylinder 21 and the support 22, the circular cylinder 21 is fixed in the simulation box, thereby limiting the simulated segment 3 from floating up and down inside the circular cylinder 21, so as to facilitate the simulated floating test.

[0027] Furthermore, in the ring shield tunnel segment flotation test device provided by the present invention, the simulated segment 3 is a cylindrical structure with closed ends and a hollow interior. This cylindrical structure facilitates the installation of a flotation detection system 5 to detect the degree of flotation of the simulated segment 3. The hollow interior of the simulated segment 3 reduces its own weight, enabling a more realistic simulation of the degree of flotation of a single ring shield tunnel segment after grouting, and making it easier to achieve flotation.

[0028] In addition, in the ring-shield tunnel segment buoyancy test device provided by the present invention, the segment adjacent ring interaction simulation system 4 includes an elastic portion 41 and a fixed portion 42. One end of the elastic portion 41 is connected to the simulated segment 3, and the other end is connected to the fixed portion 42. The fixed portion 42 is fixed to the bottom of the model box 1. The arrangement of the elastic portion 41 and the fixed portion 42 allows the simulated segment 3 to be initially positioned concentrically with the simulated shield tail gap assembly 2. The two ends of the elastic portion 41 are connected to the ends of the simulated segment 3 and the fixed portion 42, respectively, while the other end of the fixed portion 42 is fixed to the bottom of the model box 1. This ensures that the elastic portion 41 provides a stable reaction force when the simulated segment 3 floats, simulating the mechanical constraint between adjacent rings. The elastic portion 41 initially has a certain amount of deformation. During the experiment, when the simulated segment 3 floats under the action of buoyancy, a spring restrains the upward movement of the simulated segment 3, simulating the tight connection and support between adjacent segment rings in actual construction. The elastic portion 41 can be a spring.

[0029] like Figure 1 and Figure 4 As shown, in the ring shield tunnel segment floating test device provided by the present invention, the floating detection system 5 includes a limit rod 51, a limit rod mounting portion 52, a sliding portion 53, a displacement meter 54 and a displacement meter mounting rod 55. The limit rod mounting portion 52 is arranged on the side of the simulated segment 3, and the limit rod 51 is inserted into the limit rod mounting portion 52. The limit rod 51 passes through the sliding portion 53 and contacts the displacement meter 54. The limit rod 51 can move up and down through the sliding portion 53. The displacement meter 54 is connected to the displacement meter mounting rod 55. The displacement meter mounting rod 55 is connected to the model box 1. The sliding portion 53 is fixedly connected to the inner wall of the model box 1 through a connecting rod 56 to fix the sliding portion 53. When the simulated segment 3 begins to rise due to the buoyancy, the limiting rod 51 moves upward along with the simulated segment 3. The sliding portion 53 ensures that the limiting rod 51 can only move in the vertical direction. The displacement meter 54, which contacts the top of the limiting rod 51, monitors and records the vertical rise of the simulated segment 3 in real time. The displacement meter mounting rod 55 is fixedly connected to the model box 1 to ensure that the displacement meter 54 remains stable during the test.

[0030] like Figure 5 As shown, in the ring shield tunnel segment floating test device provided by the present invention, the sliding portion 53 includes a housing 531 and a ball bearing 532. The housing 531 is vertically arranged and coaxial with the limiting rod 51. The ball bearing 532 is disposed inside the housing 531. The limiting rod 51 moves vertically within the housing 531 via the ball bearing 532. The housing 531 is connected to the connecting rod 56. By providing the sliding portion 53, the simulated segment 3 is restricted from moving up and down along the sliding portion 53.

[0031] Furthermore, in the ring shield tunnel segment floatation test device provided by the present invention, the displacement meter 54 includes a sensing probe 541 that contacts the top of the limit rod 51 and is slidably disposed. The sensing probe 541, in contact with the top of the limit rod 51, and the displacement meter 54 monitor and record the vertical floatation of the simulated segment 3 in real time.

[0032] Furthermore, the present invention also provides a test method for the above-mentioned single-ring shield tunnel segment floating test device, comprising the following steps:

[0033] Step 1: At the initial moment, the simulated shield tail gap assembly 2 is concentrically arranged with the simulated segment 3, and the displacement meter 54 of the floating detection system 5 is in contact with the limit rod 51 of the floating detection system 5;

[0034] Step 2: Inject slurry into the gap between the simulated shield tail gap assembly 2 and the simulated segment 3. Initially, the slurry is in a fluid state to ensure that the simulated segment 3 is completely surrounded by the slurry so that buoyancy acts on the simulated segment 3. When the buoyancy of the simulated segment 3 in the fluid slurry is greater than its own weight, the simulated segment 3 will float upward.

[0035] Step 3. During the simulated segment 3 floating process, the segment adjacent ring action simulation system 4 limits the floating of the simulated segment 3, simulating the close connection and support between adjacent segment rings in actual construction; the up and down movement of the limit rod 51 of the floating detection system 5 will reflect the floating degree of the simulated segment 3, and the displacement meter 54 of the floating detection system 5 will monitor and record the floating displacement of the segment in real time.

[0036] The specific test method steps are:

[0037] At the initial moment, the elastic part 41 has a certain deformation to simulate the interaction force between the segment 3 and the adjacent rings. The simulated shield tail gap assembly 2 is concentrically arranged with the simulated segment 3, and the sensing probe 541 of the displacement meter 54 maintains contact with the limit rod 51; then, slurry is injected into the gap between the simulated shield tail gap assembly 2 and the simulated segment 3. Initially, the slurry is in a fluid state to ensure that the simulated segment 3 is completely surrounded by the slurry so that buoyancy acts on the segment. When the buoyancy of the simulated segment 3 in the fluid slurry is greater than its own weight, the simulated segment 3 will float up; finally, during the floating process of the simulated segment 3, the elastic part 41 limits the floating of the simulated segment 3, simulating the close connection and support between adjacent simulated segment 3 rings in actual construction. The movement of the limit rod 51 in the sliding part 53 will reflect the floating degree of the simulated segment 3. The displacement meter 54 monitors and records the floating displacement of the simulated segment 3 in real time, thereby completing the test of the single-ring shield tunnel segment floating test device.

[0038] It should be understood that the above description of the specific embodiments of the present invention is merely for the purpose of illustrating the technical approach and features of the present invention. Its purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. However, the present invention is not limited to the above-described specific embodiments. Any changes or modifications made within the scope of the claims of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A single-ring shield tunnel segment floating test device, characterized in that: The invention comprises a model box (1), a simulated shield tail gap component (2), a simulated pipe segment (3), a pipe segment adjacent ring action simulation system (4), and a floating detection system (5). The model box (1) is provided with a receiving cavity (11), the receiving cavity (11) of the model box (1) is provided with the simulated shield tail gap component (2), the simulated pipe segment (3) is provided with the simulated shield tail gap component (2), the simulated shield tail gap component (2) and the simulated pipe segment (3) are concentrically arranged, both sides of the simulated pipe segment (3) are respectively connected to the pipe segment adjacent ring action simulation system (4), and the simulated pipe segment (3) is provided with the floating detection system (5); the pipe segment adjacent ring action simulation system (4) is used to simulate the interaction between the pipe segment and its adjacent rings in actual shield tunnel construction; and the floating detection system (5) is used to measure the floating displacement of the pipe segment.

2. The single-ring shield tunnel segment floating test device according to claim 1 is characterized in that: The simulated shield tail gap assembly (2) comprises a circular cylinder (21) and a support (22); the simulated pipe segment (3) is arranged in the circular cylinder (21); the inner diameter of the circular cylinder (21) is larger than the outer diameter of the simulated pipe segment (3); both ends of the circular cylinder (21) are provided with openings; the circular cylinder (21) is fixed to the bottom of the model box (1) via the two supports (22).

3. The single-ring shield tunnel segment floating test device according to claim 1 is characterized in that: The simulated pipe segment (3) is a cylindrical structure with closed ends and a hollow interior.

4. The single-ring shield tunnel segment floating test device according to claim 1 is characterized in that: The segment adjacent ring action simulation system (4) comprises an elastic part (41) and a fixed part (42), one end of the elastic part (41) is connected to the simulated segment (3), and the other end is connected to the fixed part (42), and the fixed part (42) is fixed to the bottom of the model box (1).

5. The single-ring shield tunnel segment floating test device according to claim 1 is characterized in that: The floating detection system (5) includes a limit rod (51), a limit rod mounting portion (52), a sliding portion (53), a displacement meter (54) and a displacement meter mounting rod (55). The limit rod mounting portion (52) is arranged on the side of the simulated pipe segment (3). The limit rod (51) is inserted into the limit rod mounting portion (52). The limit rod (51) passes through the sliding portion (53) and contacts the displacement meter (54). The limit rod (51) can move up and down through the sliding portion (53). The displacement meter (54) is connected to the displacement meter mounting rod (55). The displacement meter mounting rod (55) is connected to the model box (1). The sliding portion (53) is fixedly connected to the inner wall of the model box (1) through a connecting rod (56).

6. The single-ring shield tunnel segment floating test device according to claim 5 is characterized in that: The sliding portion (53) includes a housing (531) and a ball bearing (532). The housing (531) is vertically arranged and coaxially designed with the limiting rod (51). The ball bearing (532) is provided inside the housing (531). The limiting rod (51) moves vertically in the housing (531) via the ball bearing (532). The housing (531) is connected to the connecting rod (56).

7. The single-ring shield tunnel segment floating test device according to claim 5 is characterized in that: The displacement meter (54) comprises a sensing probe (541), the sensing probe (541) contacts the top end of the limiting rod (51), and the sensing probe (541) is slidably arranged.

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