A device for preventing rotation of a shield tunnel traversing a normal fault, and its installation and control method.

Abstract

This invention discloses an anti-rotation device for a shield tunnel traversing a normal fault, and its installation and control method. The device includes a connecting plate with grouting holes and several bolt holes for easy installation. A first steel sleeve is fixedly mounted on the connecting plate. A retractable second steel sleeve is slidably mounted inside the first steel sleeve, and a retractable third steel sleeve is slidably mounted inside the second steel sleeve. The third steel sleeve is connected to a telescopic mechanism located inside the first steel sleeve. A tunneling gear is located at the front end of the third steel sleeve, and the tunneling gear is rotatably connected to a rotary motor located inside the third steel sleeve via a transmission belt. An earth pressure sensor and a gyroscope are located inside the first steel sleeve. The telescopic mechanism, rotary motor, earth pressure sensor, and gyroscope are all electrically connected to a power supply and a controller. This design allows for adaptive adjustment of the anti-rotation device's length based on earth pressure and the tunnel's rotation angle to cope with different fault displacement conditions.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of shield tunnel anti-rotation, in particular to a crossing normal fault shield tunnel anti-rotation device and its installation and control method. BACKGROUND

[0002] Active fault zones are widely distributed in China. Although relevant norms of countries around the world indicate that active fault zones should be avoided as much as possible when structures are built, due to the limitation of topography and geomorphology in the selection of large structures, a large number of faults have not been explored, and other reasons, it is difficult to avoid the tunnel crossing the active fault zone. At present, there are rich cases of crossing active faults in traffic tunnel engineering. Under the action of fault dislocation, shield tunnel may occur tunnel instability, joint opening, segment misalignment, segment damage and cracking, concrete crushing, joint shear failure, surrounding rock collapse, water leakage or gushing, and other fault disasters. Among them, the tunnel instability caused by excessive rotation of the shield tunnel is the most common. In the case where the fault dislocation cannot be estimated, the existing supporting structure with anti-rotation function of the tunnel cannot achieve the best effect, and a shield tunnel anti-rotation device that can adapt to different fault dislocation conditions is urgently needed. SUMMARY

[0003] In view of the above shortcomings of the prior art, the present application provides a crossing normal fault shield tunnel anti-rotation device and its installation and control method, which solves the problem of poor anti-rotation effect of the supporting structure on the shield tunnel in the active fault zone in the prior art.

[0004] To achieve the above-mentioned purpose, the technical scheme adopted by the present application is as follows:

[0005] A crossing normal fault shield tunnel anti-rotation device is provided, which comprises a connecting disc, a grouting hole and a plurality of bolt holes for easy installation are arranged on the connecting disc, a first steel sheet sleeve is fixedly arranged on the connecting disc, a second steel sheet sleeve which can be extended and retracted is slidably arranged in the first steel sheet sleeve, a third steel sheet sleeve which can be extended and retracted is slidably arranged in the second steel sheet sleeve, the third steel sheet sleeve is in transmission connection with an extension mechanism arranged in the first steel sheet sleeve, a tunneling gear is arranged at the front end of the third steel sheet sleeve, the tunneling gear is in rotational connection with a rotary motor arranged in the third steel sheet sleeve through a transmission belt, a soil pressure sensor and a gyroscope are arranged in the first steel sheet sleeve, and the extension mechanism, the rotary motor, the soil pressure sensor and the gyroscope are electrically connected with a power supply and a controller.

[0006] Further, a wedge-shaped plate head is arranged at the front end of the third steel sheet sleeve, the front end of the wedge-shaped plate head is in a constricted shape, and the tunneling gear is arranged at the front end of the wedge-shaped plate head.

[0007] Further, the tunneling gear is a cylindrical gear, the axial length of the cylindrical gear is equal to the length of the front end face of the third steel sheet sleeve.

[0008] Provided is a method for installing a rotation-preventing device for a shield tunnel crossing a normal fault, comprising the following steps:

[0009] S1: prefabricate a tunnel segment and reserve installation holes, grouting holes and bolt holes on the tunnel segment;

[0010] S2: prefabricate a pre-embedded part, the pre-embedded part comprising a prefabricated disc and a prefabricated steel sheet that are respectively identical in shape to the connecting disc and the first steel sleeve;

[0011] S3: pass the prefabricated steel sheet through the installation hole and fix the prefabricated disc to the inner side wall of the tunnel segment by screwing the bolt and the bolt hole, thereby completing the installation of the pre-embedded part;

[0012] S4: install the tunnel segment on the fault dislocation zone by a shield machine and install the tunnel segment with the pre-embedded part to a designed angle;

[0013] S5: remove the pre-embedded part, pass the first steel sleeve through the installation hole and fix the connecting disc to the inner side wall of the tunnel segment by screwing the bolt and the bolt hole, while connecting the grouting hole on the connecting disc to the grouting hole of the tunnel segment;

[0014] S6: inject grout into the soil through the grouting hole, and complete the installation and fixation of the rotation-preventing device after the grout solidifies.

[0015] Further, waterproof adhesive tape is installed on the contact surfaces between the prefabricated disc and the tunnel segment and between the connecting disc and the tunnel segment.

[0016] Provided is a control method for a rotation-preventing device for a shield tunnel crossing a normal fault, comprising the following steps:

[0017] A1: real-time detect the rotation angle of the tunnel segment by a gyroscope dθ , real-time detect the soil pressure on the first steel sleeve by a soil pressure sensor P , and determine the length of the rotation-preventing device by the extension amount of the telescopic mechanism L ;

[0018] A2: when the rotation angle is greater than a set rotation threshold value and the soil pressure P is less than a warning pressure threshold value , execute step A3, otherwise, execute step A4;

[0019] A3: calculate the extension amount of the rotation-preventing device by a controller , and drive the second steel sleeve and the third steel sleeve to extend by the telescopic mechanism, so as to increase the length of the rotation-preventing device L ; ​

[0020] A4: when the earth pressure P is not less than the early warning pressure threshold , step A5 is executed, otherwise, the length of the anti-rotation device L remains unchanged;

[0021] A5: the anti-rotation device shortening amount is calculated by the controller , the second steel sleeve and the third steel sleeve are driven to shrink by the telescopic mechanism, and the length of the anti-rotation device L is shortened .

[0022] The beneficial effects of the present application are:

[0023] 1. The anti-rotation device of the present scheme is used in the tunnel segment of the through normal fault, in the process of fault dislocation, the tunnel structure is driven to rotate by the friction of one side of the soil, and the anti-rotation device forms a counter torque by the earth pressure, at the same time, the larger the rotation angle of the shield tunnel, the greater the earth pressure on the anti-rotation device, and the greater the counter torque formed, thereby hindering the further rotation of the shield tunnel, and avoiding the displacement and damage of the internal structure of the tunnel due to instability.

[0024] 2. The anti-rotation device adopts a segmented structure composed of a first steel sleeve, a second steel sleeve and a third steel sleeve, so as to adjust the length of the anti-rotation device, thereby providing different sizes of counter torque for the shield tunnel; at the same time, the controller can calculate the extension and contraction of the length of the anti-rotation device by monitoring the earth pressure P , the length of the anti-rotation device L and the rotation angle of the tunnel dθ , so as to adaptively adjust the length of the anti-rotation device to cope with different fault dislocation conditions.

[0025] 3. Under the joint action of the wedge plate head and the tunneling gear, the dynamic frictional force of the third steel sleeve extending into the soil is effectively reduced, thereby facilitating the length adjustment of the present scheme in the soil.

[0026] 4. In the installation process, since the anti-rotation device is a fabricated structure, it is convenient for the construction and installation of the anti-rotation device and the replacement in the later period, the embedded part is installed before the installation of the tunnel segment, and after the tunnel segment is installed and closed into a ring, the embedded part is removed, and then the anti-rotation device is installed, which avoids damaging the anti-rotation device during the installation of the tunnel segment, and at the same time, the setting of the embedded part can close the hole of the tunnel segment prefabricated in the early stage of installation, avoiding the leakage of the tunnel segment to cause water accumulation in the tunnel, thereby improving the safety of construction.

[0027] 5. By setting waterproof rubber strips and filling the grouting hole with mortar, the sealing effect of the anti-rotation device installation is good, and the risk of leakage is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the anti-rotation device of the present scheme.

[0029] Figure 2 It is a structural schematic diagram of the anti-rotation device of the present scheme.

[0030] Figure 3 It is a structural schematic diagram of the tunnel segment.

[0031] Figure 4 It is a structural schematic diagram of the embedded part.

[0032] Figure 5 It is a structural schematic diagram of the anti-rotation device and the tunnel segment.

[0033] Figure 6 It is a structural schematic diagram of the embedded part setting angle.

[0034] Figure 7 It is a parameter labeling schematic diagram of the anti-rotation device.

[0035] Among them, 1, connecting disc, 2, grouting hole, 3, bolt hole, 4, first steel sheet sleeve, 5, second steel sheet sleeve, 6, third steel sheet sleeve, 7, heading gear, 8, transmission belt, 9, rotary motor, 10, earth pressure sensor, 11, gyroscope, 12, wedge-shaped plate head, 13, tunnel segment, 14, embedded part, 15, prefabricated disc, 16, prefabricated steel sheet, 17, electric telescopic rod, 18, power supply, 19, controller, 20, mounting hole. DETAILED DESCRIPTION

[0036] The specific embodiments of the present application are described below to facilitate those skilled in the art to understand the present application, but it should be clear that the present application is not limited to the scope of the specific embodiments, and for those skilled in the art, as long as various changes are within the spirit and scope of the present application defined and determined by the appended claims, all the inventions utilizing the concept of the present application are included in the protection.

[0037] As Figure 1 and Figure 2As shown, the anti-rotation device for a shield tunnel crossing a normal fault in this scheme includes a connecting plate 1. The connecting plate 1 is provided with grouting holes 2 and several bolt holes 3 for easy installation. A first steel plate sleeve 4 is fixedly installed on the connecting plate 1. A retractable second steel plate sleeve 5 is slidably installed inside the first steel plate sleeve 4. A retractable third steel plate sleeve 6 is slidably installed inside the second steel plate sleeve 5. The third steel plate sleeve 6 is connected to a telescopic mechanism installed inside the first steel plate sleeve 4. The telescopic mechanism is an electric telescopic rod 17 whose telescopic amount can be controlled. A tunneling gear 7 is provided at the front end of the third steel plate sleeve 6. The tunneling gear 7 is rotatably connected to a rotary motor 9 installed inside the third steel plate sleeve 6 through a transmission belt 8. An earth pressure sensor 10 and a gyroscope 11 are installed inside the first steel plate sleeve 4. The electric telescopic rod 17, the rotary motor 9, the earth pressure sensor 10, and the gyroscope 11 are all electrically connected to a power supply 18 and a controller 19.

[0038] Preferably, the front end of the third steel sleeve 6 is provided with a wedge-shaped head 12, the front end of the wedge-shaped head 12 is constricted, and the tunneling gear 7 is provided at the front end of the wedge-shaped head 12. The tunneling gear 7 is a cylindrical gear, and the axial length of the cylindrical gear is equal to the length of the front end face of the third steel sleeve 6.

[0039] like Figure 3 , Figure 4 and Figure 5 As shown, the installation method of the anti-rotation device for shield tunnels crossing normal faults in this scheme includes the following steps:

[0040] S1: Precast tunnel segments 13, and pre-reserve installation holes 20, grouting holes 2 and several bolt holes 3 on the tunnel segments 13;

[0041] S2: Precast embedded part 14, the embedded part 14 includes a precast disc 15 and a precast steel sheet 16 that are identical in shape to the connecting disc 1 and the first steel sheet sleeve 4 respectively;

[0042] S3: Pass the precast steel sheet 16 through the mounting hole 20, and fix the precast disc 15 on the inner wall of the tunnel segment 13 by means of the threaded engagement of the bolt with the bolt hole 3, thus completing the installation of the embedded part 14.

[0043] S4: The tunnel segment 13 is installed on the fault slip zone using a tunnel boring machine, and the tunnel segment 13 with pre-embedded parts 14 is installed to the designed angle; such as Figure 6 As shown, in this scheme, the embedded part 14 is preferably set at an angle of inclination to the upper right of the center of the shield tunnel. θ The center of tunnel segment 13 is at 45±5°, so that the anti-rotation device installed later meets the design angle requirements;

[0044] S5: Remove the embedded part 14, pass the first steel sleeve 4 through the installation hole 20, and fix the connecting plate 1 on the inner wall of the tunnel segment 13 by threading the bolt with the bolt hole 3. At the same time, connect the grouting hole 2 on the connecting plate 1 with the grouting hole 2 of the tunnel segment 13.

[0045] S6: Grout is injected into the soil through grouting hole 2. After the grout solidifies, the anti-rotation device is installed and fixed.

[0046] During installation, waterproof strips are installed on the contact surfaces between the precast plate 15 and the tunnel segment 13, and between the connecting plate 1 and the tunnel segment 13. By setting waterproof strips and filling the grouting hole 2 with mortar, the sealing effect at the anti-rotation device installation point is good, avoiding the risk of leakage.

[0047] like Figure 2 and Figure 7 As shown, the control method for the anti-rotation device of the shield tunnel crossing the normal fault in this scheme includes the following steps:

[0048] A1: The rotation angle of the tunnel segment 13 is detected in real time by the gyroscope 11. dθ The earth pressure sensor 10 detects the earth pressure on the first steel sleeve 4 in real time. P The length of the anti-rotation device is derived from the telescopic mechanism's extension and retraction. L ;

[0049] A2: When the rotation angle Greater than the set rotation threshold And earth pressure P If the pressure is less than the warning pressure threshold, proceed to step A3; otherwise, proceed to step A4.

[0050] A3: Calculate the elongation of the anti-rotation device via controller 19. The second steel sleeve 5 and the third steel sleeve 6 are extended by the telescopic mechanism, thereby increasing the length of the anti-rotation device. L Increase ;

[0051] A4: When earth pressure P Not less than the warning pressure threshold If so, proceed to step A5; otherwise, the length of the anti-rotation device... L Remain unchanged;

[0052] A5: Calculate the shortening amount of the anti-rotation device via controller 19. The second steel sleeve 5 and the third steel sleeve 6 are retracted by the telescopic mechanism, which increases the length of the anti-rotation device. L shorten .

[0053] In the above control method, the rotation threshold is set to 0.3°, and the elongation is... The calculation formula is:

[0054]

[0055] in, This is the time increment of tunnel segment 13 during its rotation;

[0056] Warning pressure threshold The calculation formula is:

[0057]

[0058] Warning pressure threshold Length of anti-rotation device L Changes are updated in real time;

[0059] when P At that time, the amount of shortening The calculation formula is:

[0060]

[0061] in, E The elastic modulus of the first steel sleeve 4 is... and The thicknesses are those of the first steel sleeve 4 and the second steel sleeve 5, respectively.

[0062] In summary, the anti-rotation device in this scheme can be based on earth pressure. P and the rotation angle of the tunnel dθ The length of the anti-rotation device is adaptively adjusted to cope with different fault displacement situations, making it highly practical and functional. At the same time, the installation method of the anti-rotation device is reasonably designed, easy to operate, and the sealing effect at the installation point of the anti-rotation device is good, avoiding the risk of leakage and improving the safety and efficiency of installation and construction.

Claims

1. A rotation-preventing device for a shield tunneling through a normal fault, characterized in that The utility model relates to a tunnel anti-rotation device, including connecting disc (1), be provided with grouting hole (2) and a plurality of convenient installation bolt hole (3) on connecting disc (1), first steel sheet sleeve (4) is fixedly arranged on connecting disc (1), the telescopic second steel sheet sleeve (5) is slidably arranged in first steel sheet sleeve (4), the telescopic third steel sheet sleeve (6) is slidably arranged in second steel sheet sleeve (5), third steel sheet sleeve (6) is transmission connection with the telescopic mechanism arranged in first steel sheet sleeve (4), the front end of third steel sheet sleeve (6) is provided with tunneling gear (7), tunneling gear (7) is rotatably connected with the rotary motor (9) arranged in third steel sheet sleeve (6) through transmission belt (8), soil pressure sensor (10) and gyroscope (11) are arranged in first steel sheet sleeve (4), and the telescopic mechanism, rotary motor (9), soil pressure sensor (10) and gyroscope (11) are electrically connected with power supply (18) and controller (19).

2. The anti-rotation device for crossing a normal fault with a shield tunnel according to claim 1, wherein, The front end of the third steel sheet sleeve (6) is provided with a wedge-shaped plate head (12), and the front end of the wedge-shaped plate head (12) is constricted.

3. The anti-rotation device for crossing a normal fault with a shield tunnel according to claim 1, wherein, The tunneling gear (7) is a cylindrical gear, and the axial length of the cylindrical gear is equal to the length of the front end face of the third steel sheet sleeve (6).

4. A method of installing the anti-rotation device for a shield tunnel crossing a normal fault according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: S1: prefabricating a tunnel segment (13) and reserving installation holes (20), grouting holes (2), and bolt holes (3) on the tunnel segment (13); S2: prefabricating a pre-embedded part (14), which comprises a prefabricated disc (15) and a prefabricated steel sheet (16) that are consistent in shape with the connecting disc (1) and the first steel sheet sleeve (4), respectively; S3: passing the prefabricated steel sheet (16) through the installation holes (20) and fixing the prefabricated disc (15) on the inner side wall of the tunnel segment (13) by threadedly connecting the bolt holes (3) with bolts, thereby completing the installation of the pre-embedded part (14); S4: installing the tunnel segment (13) on a fault dislocation zone by a shield tunneling machine and installing the tunnel segment (13) with the pre-embedded part (14) to a designed angle; S5: removing the pre-embedded part (14), passing the first steel sheet sleeve (4) through the installation holes (20) and fixing the connecting disc (1) on the inner side wall of the tunnel segment (13) by threadedly connecting the bolt holes (3) with bolts, while connecting the grouting holes (2) on the connecting disc (1) with the grouting holes (2) of the tunnel segment (13); S6: injecting grout into the soil through the grouting holes (2), and completing the installation and fixation of the anti-rotation device after the grout solidifies.

5. The mounting method according to claim 4, wherein Waterproof rubber strips are installed on the contact surfaces between the prefabricated disc (15) and the tunnel segment (13) and between the connecting disc (1) and the tunnel segment (13).

6. A control method of the anti-rotation device for crossing a normal fault with a shield tunnel according to any one of claims 1 to 3, characterized in that, The method comprises the following steps: A1: Real-time detection of the rotation angle of the tunnel segment (13) by the gyroscope (11) Real-time detection of the soil pressure received by the first steel sheet sleeve (4) by the soil pressure sensor (10) P The length of the anti-rotation device is determined by the extension amount of the extension mechanism L ; A2: When the rotation angle is greater than a set rotation threshold, and the earth pressure P is less than a warning pressure threshold , step A3 is executed, otherwise, step A4 is executed; A3: calculating the elongation of the anti-rotation device by the controller (19) , driving the second steel sheet sleeve (5) and the third steel sheet sleeve (6) to extend by the telescopic mechanism, so as to increase the length of the anti-rotation device L . ​ A4: when the earth pressure P is not less than the pre-warning pressure threshold value , step A5 is executed, otherwise the length of the anti-rotation device L remains unchanged; A5: The controller (19) calculates the shortening amount of the anti-rotation device , and drives the second steel sleeve (5) and the third steel sleeve (6) to contract through the telescopic mechanism, so that the length of the anti-rotation device is shortened L . .

7. The control method according to claim 6, characterized by the elongation amount The calculation formula is: wherein is the time increment of the tunnel segment (13) during the rotation.

8. The control method according to claim 6, characterized by, The pre-warning pressure threshold The calculation formula is: The pre-warning pressure threshold With the change in the length of the anti-rotation device L Is updated in real time; When P the shortened amount is calculated as follows: wherein E E1 is the modulus of elasticity of the first steel sheet sleeve (4), and t1 and t2 are the thicknesses of the first steel sheet sleeve (4) and the second steel sheet sleeve (5), respectively.

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