A reinforcing structure for preventing and controlling the floating of a shield segment

Abstract

The utility model discloses a kind of prevention and control reinforcing structure of shield segment floating, for the construction of tunnel, the inner wall of tunnel is connected by multiple shield segments, including several sleeve valve pipes, several sleeve valve pipes are fan-shaped and arranged on shield segment;It further includes detection assembly, the detection assembly is set between the two adjacent shield segments, detection assembly includes detection rod and the measuring piece being set on detection rod, and measuring piece is used to measure the relative inclination angle between the two adjacent shield segments. Diffusion type one-way grouting is carried out through the pipe wall hole of sleeve valve pipe, the sleeve valve pipe outer wall and the soft soil layer of the annular area can be combined into one after slurry solidification, to prevent segment floating. The inclination angle of sleeve valve pipe is detected by detection assembly, when the relative inclination angle between the two adjacent shield segments reaches preset inclination angle, sleeve valve pipe can inject mud again between corresponding shield segment and the inner wall of tunnel, to accurately inhibit the floating of shield segment.

Description

Technical Field

[0001] This utility model belongs to the field of shield tunnel reinforcement technology, specifically relating to a reinforcement structure for preventing shield segment floating. Background Technology

[0002] The statements in this section are merely background information related to this utility model and do not necessarily constitute prior art.

[0003] With the large-scale construction of urban subways and underground utility tunnels, the development of underground space is increasing. To reduce road traffic congestion and meet environmental protection needs, more and more underground projects are adopting the shield tunneling method. However, in actual construction, in areas with abundant groundwater and high water pressure, the shield tunnel segments are subject to buoyancy during construction, which can easily cause the segments to float and misalign, resulting in excessive deviations in the tunnel bottom elevation and affecting the usable space of the tunnel. Severe floating can also lead to shear failure of the shield tunnel segments, shield machine head collapse, and loss of control over the shield's attitude, seriously affecting construction quality and tunnel safety.

[0004] To address the aforementioned problem of shield tunnel segment buoyancy, existing technologies, such as the anti-buoyancy structure for shield tunnel segments disclosed in utility model patent CN 222772226U, employ multiple fan-shaped sleeve valves installed on the tunnel segments at the bottom. Grouting is used to solidify and connect the sleeve valves to the ground, forming an anchoring structure that resists buoyancy. However, this type of technology has the following inherent drawbacks: This technical solution is a passive, one-time anchoring measure. Its anchoring effect is fixed after construction and cannot be adjusted according to dynamic changes in geological conditions (such as groundwater level and surrounding loads) during tunnel operation. When the buoyancy exceeds the initial design anchoring force, the structure cannot provide further restraint. Furthermore, this solution lacks real-time sensing capabilities for segment buoyancy. When supplementary reinforcement is needed, it cannot accurately locate the area with the most significant buoyancy, relying instead on large-scale, experience-based remedial grouting using delayed external measurement methods. This not only results in untimely response but also easily leads to resource waste and secondary disturbance to the ground. Therefore, the reliability and economy of this type of technology need improvement when dealing with gradual or sudden segment buoyancy. Utility Model Content

[0005] To address the aforementioned problems, this invention provides a reinforcement structure for preventing shield tunnel segment floatation. It utilizes a diffused unidirectional grouting method through holes in the sleeve valve pipe. Once the grout solidifies, it bonds the outer wall of the sleeve valve pipe to the soft soil strata of the surrounding annular area, preventing segment floatation. A detection component monitors the inclination angle of the sleeve valve pipe. When the relative inclination angle between two adjacent shield tunnel segments reaches a preset angle, the sleeve valve pipe injects grout again between the corresponding shield tunnel segment and the tunnel's inner wall, precisely suppressing segment floatation. Through this multi-layered control mechanism of prevention and reinforcement, the tunnel's forming quality is ensured.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A shield tunnel segment floating prevention and reinforcement structure is used for tunnel construction. The inner wall of the tunnel is connected by multiple shield tunnel segments, including several sleeve valve pipes. The sleeve valve pipes are arranged in a fan shape on the shield tunnel segments, and the direction of the sleeve valve pipes is perpendicular to the shield tunnel segments. It also includes a detection component, which is installed between two adjacent shield tunnel segments. The detection component includes a detection rod and a measuring element installed on the detection rod. The two ends of the detection rod are rotatably connected to the ends of two adjacent sleeve valve tubes, respectively. The measuring element is used to measure the relative tilt angle between two adjacent shield tunnel segments.

[0007] As a further technical solution, pre-drilled holes are provided on the shield tunnel segments, and the sleeve valve pipe extends through the drilled holes to the outside of the shield tunnel segments for grouting into the strata.

[0008] As a further technical solution, the sleeve valve tube includes a first sleeve valve tube and a side sleeve valve tube. The first sleeve valve tube is located vertically upward at the center of the annular tunnel, and side sleeve valve tubes are provided on both sides of the first sleeve valve tube. The side sleeve valve tubes are inclined in the radial direction of the center of the annular tunnel.

[0009] As a further technical solution, a controller is also included; the measuring element and the grouting equipment connected to the sleeve valve pipe are both electrically connected to the controller; the controller is used to receive the relative tilt angle β measured by the measuring element, and when the angle reaches the preset tilt angle α, it sends a control signal to the grouting equipment to perform secondary grouting; the preset tilt angle α is greater than or equal to the relative tilt angle β.

[0010] As a further technical solution, the measuring device is an inclinometer.

[0011] As a further technical solution, the two ends of the detection rod are rotatably connected to the end of the sleeve valve tube via a connecting rod; the end of the connecting rod away from the detection rod is fixed to the end of the sleeve valve tube, and the end of the connecting rod away from the detection rod is bonded to the outer wall of the end of the sleeve valve tube via a film.

[0012] As a further technical solution, the sleeve valve tube is a one-way sealing valve tube, which includes: The sleeve valve pipe wall has multiple through-holes. A rubber check valve is installed at the hole in the pipe wall to prevent slurry backflow; The grouting core tube is detachably installed inside the sleeve valve tube wall, and the grouting core tube has a grouting port corresponding to the hole in the tube wall.

[0013] As a further technical solution, the sleeve valve tube extends out of the outside of the tube segment through a drilled hole, and the tail of the sleeve valve tube remaining inside the tube segment is sealed with a grooved channel steel component. The sleeve valve tube and the grooved channel steel component are detachably connected.

[0014] As a further technical solution, the grooved channel steel component has a threaded blind hole at its center, which is open on the side away from the channel steel wing plate. The thread size of the blind hole matches the thread size of the sleeve valve pipe tail end; the channel steel wing plate of the grooved channel steel component is located on the side facing away from the pipe segment.

[0015] As a further technical solution, the upper and lower ends of the grouting core tube are equipped with sealing rings to prevent the grouting material from seeping into the sleeve valve tube wall outside the sealing ring.

[0016] Compared with the prior art, the advantages and positive effects of this utility model are: This invention utilizes a diffusion-type unidirectional grouting method through the holes in the sleeve valve pipe before secondary grouting. After the grout solidifies, it bonds the outer wall of the sleeve valve pipe to the soft soil layer of the surrounding annular area, preventing the tunnel segments from floating. A detection component monitors the relative tilt angle of the shield tunnel segments in real time. When this angle reaches a preset tilt angle, the sleeve valve pipe is triggered for secondary responsive grouting, precisely suppressing the floating of the shield tunnel segments. Through multiple control mechanisms of prevention and reinforcement, the tunnel's forming quality is guaranteed. The combination of real-time monitoring and responsive reinforcement constructs a closed-loop control mechanism that proactively and promptly prevents the floating of shield tunnel segments, effectively ensuring the tunnel's forming quality and long-term stability. Attached Figure Description

[0017] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0018] Figure 1 This is a schematic diagram of the anti-floating and reinforcement structure for shield tunnel segments in the circumferential direction of the tunnel according to this utility model; Figure 2This is a schematic diagram of the anti-floating and reinforcement structure for shield tunnel segments in the tunnel axis according to this utility model; Figure 3 This is a schematic diagram of the sleeve valve tube.

[0019] In the diagram: 1. Sleeve valve pipe; 2. Shield tunnel segment; 3. First sleeve valve pipe; 4. Side sleeve valve pipe; 5. Monitoring component; 6. Grooved channel steel component; 11. Sleeve valve pipe wall; 12. Sealing ring; 13. Grouting core pipe; 14. Grouting port; 15. Pipe wall hole; 16. Rubber check valve; 51. Connecting rod; 52. Detection rod. Detailed Implementation

[0020] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] The present invention will now be described in detail with reference to the accompanying drawings. This embodiment discloses a reinforcement structure for preventing the floating of shield tunnel segment 2, as shown below. Figure 1 and Figure 2 As shown, it includes the construction of the tunnel, the inner wall of the tunnel is connected by multiple shield segments 2, including several sleeve valve pipes 1, which are arranged in a fan shape on the shield segments 2, and the direction of the sleeve valve pipes 1 is perpendicular to the shield segments 2. It also includes a detection component. A detection component is set between each of two adjacent shield tunnel segments 2. The detection component includes a detection rod 52 and a measuring element set on the detection rod 52. The two ends of the detection rod 52 are rotatably connected to the ends of two adjacent sleeve valve tubes 1, respectively. The measuring element is used to measure the relative tilt angle between two adjacent shield tunnel segments 2.

[0022] Specifically, before secondary grouting, diffusion-type unidirectional grouting is performed through the pipe wall holes 15 of the sleeve valve pipe 1. After the grout solidifies, it can bond the outer wall of the sleeve valve pipe 1 with the soft soil layer of the surrounding annular area, preventing the tunnel segment from floating. The relative tilt angle of the shield tunnel segment 2 in the floating state is monitored in real time by the detection component. When the angle reaches the preset tilt angle, the sleeve valve pipe 1 can be triggered to perform secondary responsive grouting, thereby accurately suppressing the floating of the shield tunnel segment 2. Through multiple control mechanisms of prevention and reinforcement, the forming quality of the tunnel is guaranteed. The combination of real-time monitoring and responsive reinforcement constructs a closed-loop control mechanism that can proactively and promptly prevent the floating of the shield tunnel segment 2, effectively ensuring the forming quality and long-term stability of the tunnel.

[0023] Pre-drilled holes are made on the shield segment 2, and the sleeve valve pipe 1 extends through the drill holes to the outside of the shield segment 2 for grouting into the stratum.

[0024] like Figure 1As shown, the sleeve valve tube 1 includes a first sleeve valve tube 3 and a side sleeve valve tube 4. The first sleeve valve tube 3 is located vertically upward at the center of the annular tunnel, and the side sleeve valve tubes 4 are arranged on both sides of the first sleeve valve tube 3. The side sleeve valve tubes 4 are inclined in the radial direction of the center of the annular tunnel.

[0025] Specifically, the first sleeve valve pipe 3 is located vertically upward at the center of the annular tunnel; on both sides of the first sleeve valve pipe 3, two side sleeve valve pipes 4 are arranged in a radial direction of 30° with the center of the annular tunnel; the sleeve valve pipe 1 is connected to the stratum by the solidified grout.

[0026] It also includes a controller; the measuring element and the grouting equipment connected to the sleeve valve pipe 1 are both electrically connected to the controller; the controller is used to receive the relative tilt angle β measured by the measuring element, and when the angle reaches the preset tilt angle α, it sends a control signal to the grouting equipment to perform secondary grouting; the preset tilt angle α is greater than or equal to the relative tilt angle β.

[0027] Specifically, the controller can be a PLC controller, which receives the angle signal measured by the measuring component and determines whether grouting is needed based on the angle signal. The preset tilt angle is α, and the relative tilt angle between the first-stage shield segment 2 and the second-stage shield segment 2 is β, where α ≥ β.

[0028] The measuring instrument is an inclinometer.

[0029] Specifically, the measuring device is preferably a high-precision electronic inclinometer, mounted on the detection rod 52, used to measure its rotation angle, i.e., the relative tilt angle β, in real time. This angle β has a clear correspondence with the misalignment between the segments and is a direct indicator reflecting the severity of the uplift.

[0030] The two ends of the detection rod 52 are rotatably connected to the end of the sleeve valve tube 1 via the connecting rod 51; the end of the connecting rod 51 away from the detection rod 52 is fixed to the end of the sleeve valve tube 1, and the end of the connecting rod 51 away from the detection rod 52 is bonded to the outer wall of the end of the sleeve valve tube 1 via a film.

[0031] like Figure 3 As shown, the sleeve valve tube 1 is a one-way sealing valve tube, which includes: a sleeve valve tube 1 wall 11, on which multiple through-holes 15 are provided; a rubber one-way valve 16, which is provided at the hole 15 in the wall to prevent backflow of grout; and a grouting core tube 13, which is detachably provided in the sleeve valve tube 1 wall 11, and the grouting core tube 13 is provided with grouting ports 14 corresponding to the holes 15 in the wall.

[0032] Specifically, the sleeve valve tube 1 has a hollow tube wall 11 with multiple through holes 15 along its circumference and length, the hole diameter of which is preferably 1-10cm.

[0033] The rubber check valve 16 is an elastic rubber sleeve tightly fastened to the outside of the sleeve valve pipe 1 wall 11. Under normal conditions, it uses its own elasticity to press and seal the pipe wall hole 15. When the internal grouting pressure is high enough, the grout can force open the rubber check valve 16 and inject into the formation; when grouting stops and the internal pressure disappears, it immediately rebounds and resets, effectively preventing grout backflow and external water and soil intrusion.

[0034] During operation, high-pressure grout enters through the grouting core tube 13. Constrained by two sealing rings 12, it can only flow out through the grouting port 14 and precisely act on a few pipe wall holes 15 corresponding to the grouting section, before opening the rubber one-way valve 16 to enter the formation. By moving the grouting core tube 13 up and down, segmented and quantitative precise grouting of formations at different depths can be achieved, greatly improving the controllability and efficiency of grouting.

[0035] The sleeve valve tube 1 extends outward from the outside of the tube segment through a drilled hole. The tail end of the sleeve valve tube 1, located inside the tube segment, is sealed by a grooved channel steel component 6. The sleeve valve tube 1 and the grooved channel steel component 6 are detachably connected. The grooved channel steel component 6 has a threaded blind hole in its center, which is located on the side away from the channel steel flange. The thread size of the blind hole matches the thread size of the tail end of the sleeve valve tube 1. The channel steel flange of the grooved channel steel component 6 is located on the side facing away from the tube segment.

[0036] Specifically, the sleeve valve pipe 1, located at the tail end inside the tunnel, is threaded and sealed using a grooved channel steel component 6. This component can be easily screwed on or unscrewed with tools, achieving detachability compared to traditional cement or welded sealing, thus creating conditions for secondary or multiple responsive grouting.

[0037] The grouting core tube 13 has sealing rings 12 at both the upper and lower ends to prevent the grouting material from seeping into the sleeve valve tube 1 wall 11 outside the sealing ring 12.

[0038] Specifically, the grouting core tube 13 is a detachable fitting that can be inserted into the wall 11 of the sleeve valve tube 1. Its key feature is that it has a bidirectional sealing ring 12 at each of its upper and lower ends, forming a grouting section of a defined length between the two sealing rings 12. A grouting port 14 is provided on the wall of this grouting section.

[0039] When any shield tunnel segment 2 floats upward, a misalignment occurs between two adjacent shield tunnel segments 2, causing the first sleeve valve pipe 3 and connecting rod 51 on it to float up and down. This causes the detection rod 52 to rotate, creating an angle β between the detection rod 52 and the tunnel axis. This angle is the relative tilt angle between two adjacent shield tunnel segments 2. The larger the relative tilt angle, the greater the misalignment. Therefore, by measuring the angle between two adjacent shield tunnel segments 2, it can be determined whether the upward float of the shield tunnel segment 2 is within the allowable range. The measuring device can detect the relative tilt angle β between two adjacent shield tunnel segments 2 in real time. When the relative tilt angle reaches the preset tilt angle α, the grouting mechanism performs secondary grouting on the sleeve valve pipe 1 on the corresponding segment, thereby accurately suppressing the upward float of the shield tunnel segment 2.

[0040] Although the specific embodiments of the present utility model have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present utility model. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solution of the present utility model are still within the scope of protection of the present utility model.

Claims

1. A reinforcing structure for preventing and controlling the floating of a shield segment for tunnel construction, in which inner walls of a tunnel are connected by a plurality of shield segments, characterized in that, It includes several sleeve valve tubes, which are arranged in a fan shape on the shield tunnel segments, with the direction of the sleeve valve tubes perpendicular to the shield tunnel segments; It also includes a detection component, which is installed between two adjacent shield tunnel segments. The detection component includes a detection rod and a measuring element installed on the detection rod. The two ends of the detection rod are rotatably connected to the ends of two adjacent sleeve valve tubes, respectively. The measuring element is used to measure the relative tilt angle between two adjacent shield tunnel segments.

2. The reinforced structure for preventing and controlling the upward floating of a shield segment according to claim 1, characterized in that, The shield tunnel segment has pre-drilled holes, and the sleeve valve pipe extends through the drill holes to the outside of the shield tunnel segment for grouting into the stratum.

3. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 1, wherein The sleeve valve tube includes a first sleeve valve tube and side sleeve valve tubes. The first sleeve valve tube is located vertically upward at the center of the annular tunnel. Side sleeve valve tubes are provided on both sides of the first sleeve valve tube. The side sleeve valve tubes are inclined in the radial direction of the center of the annular tunnel.

4. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 1, wherein It also includes a controller; the measuring element and the grouting equipment connected to the sleeve valve pipe are both electrically connected to the controller; the controller is used to receive the relative tilt angle β measured by the measuring element, and when the angle reaches the preset tilt angle α, it sends a control signal to the grouting equipment to perform secondary grouting; the preset tilt angle α is greater than or equal to the relative tilt angle β.

5. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 1, wherein The measuring instrument is an inclinometer.

6. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 1, wherein The two ends of the detection rod are rotatably connected to the end of the sleeve valve tube via a connecting rod; the end of the connecting rod away from the detection rod is fixed to the end of the sleeve valve tube, and the end of the connecting rod away from the detection rod is bonded to the outer wall of the end of the sleeve valve tube via a film.

7. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 1, wherein The sleeve valve tube is a one-way sealing valve tube, which includes: The sleeve valve pipe wall has multiple through-holes. A rubber check valve is installed at the hole in the pipe wall to prevent slurry backflow; The grouting core tube is detachably installed inside the sleeve valve tube wall, and the grouting core tube has a grouting port corresponding to the hole in the tube wall.

8. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 7, wherein The sleeve valve tube extends out of the outside of the tube segment through a drilled hole, and the tail of the sleeve valve tube remaining inside the tube segment is sealed with a grooved channel steel component. The sleeve valve tube and the grooved channel steel component are detachably connected.

9. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 8, wherein The grooved channel steel component has a threaded blind hole at its center, which is located on the side away from the channel steel flange. The thread size of the blind hole matches the thread size of the sleeve valve pipe tail end. The channel steel flange of the grooved channel steel component is located on the side facing away from the pipe segment.

10. The reinforced structure for preventing and controlling the upward movement of a shield segment according to claim 7, wherein The grouting core tube has sealing rings at both the upper and lower ends to prevent grouting material from seeping into the sleeve valve tube wall outside the sealing ring.

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