Construction method for accurate control of shield in-ground butt joint

Abstract

The invention provides a construction method for accurate control of shield underground butt joint, and relates to the field of shield tunneling. Camera transmission conditions are created through an underground drill rod to control and adjust the butt joint error of two shield tunneling machines in opposite construction. According to the method, the lighting device and the photographing device are arranged in the drill rod to recognize the mark on the following shield tunneling machine, the relative position relation and posture of the following shield tunneling machine and the preceding shield tunneling machine can be rapidly calculated and analyzed after the picture is transmitted to the computer, and a brand-new method is provided for long-distance shield opposite butt joint precision control. According to the method, the mode that the relative position relation of the two shield tunneling machines is calculated through a traditional wire measurement method is replaced, and the problem that the butt joint construction risk is greatly increased when the error technology of the long-distance wire measurement method is 10-30 cm is solved. And through the technology of creating the photographing space identification mark through the drill rod, the photographing error is only 2 mm, the shield opposite-direction butt joint precision is improved, and the butt joint construction risk is greatly reduced.

Description

Technical Field

[0001] The invention relates to a construction method for precise control of shield underground docking, and relates to the technical field of shield tunnel engineering. Background Art

[0002] In the existing tunnel shield construction process, the single tunneling length of a shield machine with a diameter of 15m or above is generally no more than 10 kilometers. my country plans to build a cross-sea tunnel with a length of more than 30 kilometers in the future, which requires the shield machines facing each other to quickly and safely dock underwater. At present, there is no precedent for the docking of two shield machines facing each other underwater. If the docking position of the two shield machines cannot be accurately controlled and the posture of the shield machines cannot be accurately measured, mechanical collision will occur during the docking and the docking posture deviation will be too large, which will inevitably bring safety risks to the shield machine docking construction, affect the tunnel line shape and increase the difficulty of construction at the connection.

[0003] In order to measure and control the docking of two shield machines in high-pressure permeable sand layers, the positions and postures of the two shield machines need to be mastered in a timely manner, especially when the two shield machines are less than 50m apart, so that the docking accuracy can be measured, adjusted and optimized to ensure the safety of docking construction. At present, the posture and position measurement of opposing shield machines mainly rely on the monitoring of their own tunnel level, gyroscope and other instruments. There is a certain error of up to 10cm to 15cm, and the accuracy and inclination cannot meet the requirements of the docking accuracy of opposing shield machines. The conventional measurement of the tunnel posture by leveling points is limited by equipment and technical conditions. The current specifications and technical levels are 10cm for less than 5km, 15cm for more than 5km, and the docking error of tunnels over 10km may reach 30cm, which greatly increases the risk of docking construction. Summary of the invention

[0004] The invention relates to a construction method for precise control of shield underground docking, relates to the technical field of shield tunnel engineering, and is used for controlling and adjusting the docking error size of two shield machines in shield opposite docking construction. By controlling the spatial relative position relationship between the rear shield machine and the leading shield machine, the error caused by tunnel length measurement is avoided, the docking accuracy is improved, and the docking accuracy of the shield machines can be quickly judged during the construction period.

[0005] The present invention provides a construction method for precise control of shield underground docking, comprising the following steps:

[0006] Step 1: Install 3 dials on the cutter head before the rear shield machine excavates;

[0007] Step 2: After the leading shield machine reaches the designated docking position, a water-stop ball valve device is welded on the trailing shield machine, and the drill rod passes through the water-stop ball valve device, the pressure baffle of the leading shield machine, the cutter head of the leading shield machine, and the soil layer between the leading shield machine and the trailing shield machine in sequence to reach the designated position;

[0008] Step 3: Open the drill pipe and install a measuring sealing tube in the drill pipe, wherein a laser transmitter and a camera are installed in the measuring sealing tube;

[0009] Step 4: The rear shield machine stops after it has advanced to a position close to the leading shield machine;

[0010] Step 5: Open the measuring sealed tube, the laser transmitter emits laser infrared rays to the scale plate, turn on the lighting device to provide light source to the camera device, the camera device takes a photo of the infrared spot image on the scale plate, the photo is automatically transmitted to the computer, and the deviation value between the following shield machine and the leading shield machine is output;

[0011] Step six: The drill rod moves backward, and the driver of the rear shield machine promptly corrects the posture and route of the shield machine according to the deviation value. Each time the rear shield machine moves forward, the operation steps in step five are repeated until the two shield machines are accurately docked.

[0012] Preferably, the scale dials on the cutterhead of the subsequent shield machine are designed based on the operating space after the prior shield machine is disassembled, and the three scale dials must not be on the same line, and the scale dials are notched on the cutterhead panel.

[0013] Preferably, the notch diameter D o The following formula is satisfied to ensure that the projection of the drill rod on the cutterhead of the rear shield machine is always within the scale range:

[0014]

[0015] Where ΔL represents the measurement error from the two tunnels to the butt joint; D1 represents the diameter of the drill pipe.

[0016] Furthermore, a flushing nozzle device is installed near the scale plate on the cutter head of the rear shield machine. During the excavation process of the shield machine, the flushing nozzle device is retracted inside the cutter head. After the shield machine is stopped, the flushing nozzle device is pushed out by a hydraulic jack to flush the soil on the surface of the scale plate.

[0017] Preferably, the flushing nozzle device satisfies the following formula to ensure that the dirt on the dial is flushed clean:

[0018]

[0019] Among them, H0 represents the extension distance of the hydraulic device to push the flushing nozzle device, h0 represents the thickness of the cutterhead of the rear shield machine, h1 represents the distance of the flushing nozzle extending out of the cutterhead or retracting into the cutterhead, L0 represents the distance between the flushing nozzle and the notch, P0 represents the water pressure of the flushing nozzle, and D o Indicates the notch diameter.

[0020] Furthermore, the water-stop ball valve device is fully welded around the pressure baffle of the preceding shield machine, using fillet welds, and the fillet weld strength meets the following requirements:

[0021] P1≥1.5P2

[0022] Where P1 represents the fillet weld strength, and P2 represents the water and soil pressure outside the shield machine at the water-stop ball valve device.

[0023] Preferably, in order to meet the requirements of the camera light source, the installation location must meet the following requirements:

[0024] L1 ≥ D1ctanα / K1

[0025] Where L1 represents the distance from the lighting device to the plexiglass, α represents the angle between the light point of the lighting device and the bottom of the plexiglass, K1 represents the safety factor, and D1 represents the diameter of the drill rod.

[0026] Furthermore, the coordinates of the first drilling hole on the pressure baffle of the leading shield machine are (x1, y1, z1), the coordinates of the second drilling hole are (x2, y2, z2), and the coordinates of the third drilling hole are (x3, y3, z3). The coordinates of the laser spot on the dial corresponding to the first drilling hole of the trailing shield machine are (x 11 ,y 11 , z 11 ), the coordinates of the laser spot on the dial corresponding to the second drilling hole are (x 22 ,y 22 , z 22 ), the coordinates of the laser spot on the dial corresponding to the third drilling hole are (x 33 ,y 33 , z 33 ), the relationship between the coordinates of the two shield machines satisfies:

[0027]

[0028] where x i ,y i 、z i represent the horizontal, vertical, and longitudinal coordinates of the i-th borehole on the pressure baffle of the leading shield machine (i=1, 2, 3), respectively. ii ,y ii 、z ii represents the horizontal, vertical, and longitudinal coordinates of the laser spot on the scale plate corresponding to the i-th drilling hole of the subsequent shield machine (i=1,2,3), Δx i Indicates the horizontal distance from the horizontal coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate, Δy i Indicates the vertical distance from the vertical coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate, Δz i It indicates the drill rod length from the i-th hole drilled by the leading shield machine to the corresponding dial of the following shield machine.

[0029] Preferably, the angle between the rear shield machine and the leading shield machine at the parking position satisfies:

[0030]

[0031] Where θ represents the angle between the leading shield machine and the trailing shield machine, the plane normal vector of the leading shield machine is (l1, m1, n1), and the plane normal vector of the trailing shield machine is (l2, m2, n2). j 、m j 、n j They are dimensionless coefficients (j=1,2) and are obtained according to the following formula:

[0032]

[0033] Preferably, the lateral deviation of the rear shield machine from the center satisfies:

[0034]

[0035] Among them, Δx0 represents the lateral distance of the center deviation of the rear shield machine, Δx1 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the first drilling hole to the center of the dial, and Δx2 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the second drilling hole to the center of the dial;

[0036] The vertical deviation of the rear shield machine from the center meets the following requirements:

[0037]

[0038] Among them, Δy0 represents the vertical distance of the center deviation of the following shield machine, Δy1 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the first drilling hole to the center of the dial, Δy3 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the third drilling hole to the center of the dial, and θ represents the angle between the preceding shield machine and the following shield machine. The beneficial effects of the present invention are:

[0039] (1) The present invention proposes that the posture and coordinates of the leading shield machine remain unchanged after arriving at the specified position. By controlling the spatial relative position relationship between the following shield machine and the leading shield machine, the error caused by the tunnel length measurement is avoided, the docking accuracy is improved, and the risk is reduced.

[0040] (2) The present invention is ingenious in device design. Through the cooperation of the dial, laser transmitter and other devices, the exact position of the infrared spot on the dial can be accurately read, and the error is only the size of the spot diameter. And the formula is limited by the parameters of the notch diameter to ensure that the drill rod is always within the range of the dial, thereby improving the accuracy of the equipment.

[0041] (3) The present invention ensures that the water pressure outside the shield machine does not enter the tunnel by setting the water-stop ball valve device and its conditions. The water-stop plugging device is installed at the top of the measuring sealing tube to effectively prevent the water in the drill pipe from entering the measuring sealing tube.

[0042] (4) The present invention ensures that the soil on the dial is washed away by adding a flushing nozzle device. In addition, during the excavation process of the shield machine, the flushing nozzle device is retracted inside the cutter head. After the shield machine is stopped, the flushing nozzle device is pushed out by a hydraulic jack to wash the soil on the surface of the dial. The design is quite ingenious. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0044] Figure 1 This is a schematic diagram of the shield machine underground docking accuracy measurement device;

[0045] Figure 2 It is a schematic diagram of the opening of the pressure baffle of the leading shield machine;

[0046] Figure 3 It is a schematic diagram of a water-stop ball valve device;

[0047] Figure 4 This is a schematic diagram of the cutterhead arrangement of the rear shield machine;

[0048] Figure 5 It is a schematic diagram of the dial of the present invention.

[0049] Figure numbers: 1—advancing shield machine; 2—rearing shield machine; 3—pressure baffle of the leading shield machine; 301—the first hole opening position of the baffle drill rod; 302—the second hole opening position of the baffle drill rod; 303—the third hole opening position of the baffle drill rod; 4—the cutterhead of the leading shield machine; 5—water-stop ball valve device; 501—steel pipe; 502—sealing support; 503—ball valve; 6—drill rod; 7—measuring sealing tube; 8—laser transmitter; 9—illumination device; 10—photographic device; 11—water-stop sealing device; 12—the cutterhead of the rear shield machine; 13—dial; 131—the first dial; 132—the second dial; 133—the third dial; 14—flushing nozzle device. DETAILED DESCRIPTION

[0050] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0051] The present invention proposes a construction method for precise control of underground shield connection, which realizes the control and adjustment of the connection error size of two shield machines in opposite construction by creating photographic transmission conditions through underground drill rods, and relates to the field of shield. The present invention arranges lighting devices and photographic devices in the drill rod to identify the mark on the following shield machine. After the photo is transmitted to the computer, the relative position relationship and posture of the following shield machine and the leading shield machine can be quickly calculated and analyzed, providing a new method for the precision control of long-distance shield connection. This method replaces the traditional "wire measurement" method of calculating the relative position relationship between two shield machines, and solves the problem that the error technology of the long-distance wire measurement method greatly increases the risk of connection construction at the level of 10cm-30cm. By creating a photographic space identification mark technology through the drill rod, the photographic error is only 2mm, which improves the precision of shield connection and greatly reduces the risk of connection construction.

[0052] Example 1

[0053] A construction method for precise control of shield underground docking, comprising the following steps:

[0054] Step 1: Before the rear shield machine 2 excavates, three scale plates 13 are installed on the cutter head;

[0055] Step 2: After the leading shield machine 1 reaches the designated docking position, the water-stop ball valve device 5 is welded to the dial plate 13 on the trailing shield machine 2, and the drill rod 6 passes through the water-stop ball valve device 5 and then passes through the pressure baffle 3 of the leading shield machine, the cutter head 4 of the leading shield machine, and the soil layer between the two shields to reach the designated position;

[0056] Step 3: Open the drill rod 6, install the measuring sealing tube 7 in the drill rod 6, and install the laser transmitter 8 at the end of the measuring sealing tube 7;

[0057] Step 4: After the rear shield machine 2 has excavated to a distance of about 30 m from the leading shield machine 1, it stops and the flushing nozzle device 14 is turned on to clean the soil on the dial 13;

[0058] Step 5: Turn on the laser transmitter 8, lighting device 9, and camera device 10 of the measuring sealed tube 7, and transmit the photo of the laser spot position on the dial 13 to the computer in real time, measure the length of the drill rod 6, and the computer reads the distance Δx between the laser spot and the center point of the dial 13. i , Δy i Directional distance: the relative angle, up-down, left-right relative difference between the trailing shield machine 2 and the leading shield machine 1 are calculated according to the calculation formula;

[0059] Step 6: The drill rod 6 and the measuring sealing tube 7 retreat 10m, and the driver of the rear shield machine promptly corrects the posture and route of the shield machine according to the calculated value in step 5. The rear shield machine moves forward 10m each time, repeating the operation steps of step 5, and then promptly corrects the posture and route of the shield machine according to the calculated value until the two shield machines are accurately docked;

[0060] Step 7: Remove the drill rod 6 and measuring sealing tube 7 and other equipment, and close the water stop ball valve device 5.

[0061] An illumination device 9 and a photographic device 10 are installed inside the measuring sealed tube 7 to emit laser infrared rays to the scale plate 13. The illumination device 10 is turned on to provide light source to the photographic device 10. The photographic device 10 takes a photo of the infrared spot image on the scale plate 13, and the photo is automatically transmitted to the computer. The accuracy error can be controlled within 2 mm through this method.

[0062] Example 2

[0063] like Figure 2 As shown, 3 is the pressure baffle of the leading shield machine; 301 is the first opening position of the baffle drill rod; 302 is the second opening position of the baffle drill rod; 303 is the third opening position of the baffle drill rod. Figure 4 As shown, 12 is the cutterhead of the rear shield machine, 131 is the first scale plate, 132 is the second scale plate, and 133 is the third scale plate. The coordinates of the first drilling hole on the pressure baffle 3 of the leading shield machine are (x1, y1, z1), the coordinates of the second drilling hole are (x2, y2, z2), and the coordinates of the third drilling hole are (x3, y3, z3). The coordinates of the laser spot on the scale plate 13 corresponding to the first drilling hole of the rear shield machine are (x 11 ,y 11 , z 11 ), the coordinates of the laser spot on the dial 13 corresponding to the second drilling hole are (x 22 ,y 22 , z 22 ), the coordinates of the laser spot on the dial 13 corresponding to the third drilling hole are (x 33 ,y 33 , z 33 ), the relationship between the coordinates of the two shield machines satisfies:

[0064]

[0065] where x i ,y i 、z i represent the horizontal, vertical, and longitudinal coordinates of the i-th borehole on the pressure baffle 3 of the leading shield machine (i=1, 2, 3), respectively. ii ,y ii 、z iirepresents the horizontal, vertical and longitudinal coordinates of the laser spot on the scale plate 13 corresponding to the i-th drilling hole of the rear shield machine (i=1,2,3), Δx i Indicates the horizontal distance from the horizontal coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate 13, Δy i Indicates the vertical distance from the vertical coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate 13, Δz i It indicates the length of the drill rod 6 from the i-th hole drilled by the preceding shield machine 1 to the corresponding scale plate 13 of the succeeding shield machine.

[0066] The angle between the rear shield machine 2 and the leading shield machine 1 at the parking position satisfies:

[0067]

[0068] Where θ represents the angle between the leading shield machine 1 and the trailing shield machine 2, the plane normal vector of the leading shield machine 1 is (l1, m1, n1), and the plane normal vector of the trailing shield machine 2 is (l2, m2, n2), l j 、m j 、n j They are dimensionless coefficients (j=1,2) and are obtained according to the following formula:

[0069]

[0070] The lateral deviation of the rear shield machine 2 from the center meets the following requirements:

[0071]

[0072] Among them, Δx0 represents the lateral distance of the center deviation of the rear shield machine 2, Δx1 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the first drilling hole to the center of the dial 13, and Δx2 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the second drilling hole to the center of the dial 13.

[0073] The vertical deviation of the rear shield machine 2 from the center meets the following requirements:

[0074]

[0075] Among them, Δy0 represents the vertical distance of the center deviation of the following shield machine, Δy1 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the first drill hole to the center of the dial 13, Δy3 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the third drill hole to the center of the dial 13, and θ represents the angle between the leading shield machine 1 and the following shield machine 2.

[0076] Example 3

[0077] This embodiment further defines the water stop ball valve device 5. Figure 3Shown is a schematic diagram of a water-stop ball valve device 5, which is composed of a steel pipe 501, a sealing support 502 and a ball valve 503. The ball valve device 5 is welded to the pressure baffle 3 of the leading shield machine. The drill rod 6 passes through the water-stop ball valve device 5, and the sealing support 502 and the ball valve 503 are opened to prevent groundwater from flowing into the leading shield machine along the drill rod 6, thereby improving the waterproof sealing performance.

[0078] The water-stop ball valve device 5 is welded at the corresponding position of the dial 13 on the rear shield machine 2. The water-stop ball valve device 5 is fully welded around the pressure baffle 3 of the leading shield machine, using fillet welds. If necessary, steel plate stiffening ribs are welded to ensure that the water pressure outside the shield machine does not enter the tunnel:

[0079] P1≥1.5P2

[0080] Where P1 represents the fillet weld strength, and P2 represents the water and soil pressure outside the shield machine at the water-stop ball valve device 5.

[0081] Example 4

[0082] This embodiment further defines the measuring sealing tube 7. A water-stopping plugging device 11 is installed at the top of the measuring sealing tube 7 to prevent water in the drill pipe 6 from entering the measuring sealing tube 7. The water-stopping plugging device 11 is made of organic transparent glass, and the organic transparent glass is connected to the steel pipe with glass glue. If necessary, angle steel is used to reinforce the two sides to withstand water pressure not less than P1.

[0083] Example 5

[0084] This embodiment further defines the dial. Figure 5 It is a schematic diagram of the dial of the present invention. The infrared spot of the laser transmitter on the leading shield machine has a diameter of 2mm on the dial of the trailing shield machine. The dial is divided into 1cm grids. The computer can accurately read the exact position of the infrared spot on the dial through the camera to transmit the photo. The error is only the size of the spot diameter. The dial 13 on the cutter head 12 of the trailing shield machine is designed according to the operating space after the leading shield machine 1 is disassembled. The three dials 13 must not be on the same line. The dial 13 is scored on the cutter head panel. The scoring depth is 5mm, the width is 2mm, the criss-cross spacing is 1cm, and the scoring diameter D o The following formula is satisfied to ensure that the drill rod 6 is always within the range of the scale plate 13:

[0085]

[0086] Wherein ΔL represents the measurement error from the two tunnels to the butt joint section; D1 represents the diameter of the drill rod 6, the diameter of the drill rod 6 is not less than 10 cm, the wall thickness is not less than 5 cm, and the material is preferably steel pipe.

[0087] The notch size is required to be greater than 3ΔL. The traditional measurement docking error control requirement is 10cm for less than 5km and 15cm for greater than 5km. This ensures that when the drill rod is aligned with the subsequent shield machine, the drill rod is always within the dial, that is, the laser spot can always fall within the dial. By photographing the position of the laser spot on the dial, the coordinates of the laser spot on the dial can be calculated.

[0088] Example 6

[0089] This embodiment further defines the flushing nozzle device 14. The flushing nozzle device 14 is installed near the scale plate 13 on the cutter head 12 of the rear shield machine. The flushing nozzle device 14 has a telescopic function and a 360° rotation cleaning function. During the tunneling process of the shield machine, the flushing nozzle device 14 is retracted inside the cutter head. After the shield machine is stopped, the flushing nozzle device 14 is pushed out by the hydraulic jack to flush the soil on the surface of the scale plate 13. The flushing nozzle device 14 satisfies the following formula to ensure that the soil on the scale plate 13 is cleaned:

[0090]

[0091] Among them, H0 represents the extension and retraction distance of the hydraulic device to push the flushing nozzle device 14, h0 represents the thickness of the rear shield machine cutter head 12, h1 represents the distance that the flushing nozzle extends out of the cutter head or is retracted into the cutter head (among which: the extension of the cutter head is not less than 3cm, and the retraction of the cutter head is not less than 1cm), L0 represents the distance between the flushing nozzle and the notch, and P0 represents the water spraying pressure of the flushing nozzle.

[0092] Example 7

[0093] This embodiment further defines the laser emitter 8 and the lighting device 9. The laser emitter 8 uses a high-precision infrared laser, a 600nw red light crosshair, a spot size of 2mm-10mm, and a 100m accuracy requirement of 2mm.

[0094] The lighting device 9 uses an intelligent control switch and a lighting angle to automatically adjust the lighting. To meet the requirements of the camera device 10, the installation position of the light source must meet the following requirements:

[0095] L1 ≥ D1ctanα / K1

[0096] Wherein L1 represents the distance from the lighting device 9 to the organic glass, α represents the angle between the light-emitting point of the lighting device 9 and the bottom of the organic glass, and K1 represents the safety factor, which is 1.2 to 1.5.

[0097] The photographic device 10 uses an automatic capture, automatic focus, and automatic transmission camera, and the pixel requirement is a high-definition picture of not less than 40 million pixels. After taking the picture, the storage system automatically uploads it to the computer.

[0098] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A construction method for precise control of shield underground docking, characterized in that: The steps include: Step 1: Before the rear shield machine (2) advances, three scale plates (13) are installed on the cutter head; Step 2: After the leading shield machine (1) reaches the designated docking position, a water stop ball valve device (5) is welded on the trailing shield machine (2), and the drill rod (6) sequentially passes through the water stop ball valve device (5), the leading shield machine pressure baffle (3), the leading shield machine cutterhead (4), and the soil layer between the leading shield machine (1) and the trailing shield machine (2) to reach the designated position; Step 3: Open the drill rod (6), install a measuring sealed tube (7) in the drill rod (6), and install a laser transmitter (8) and a camera (10) in the measuring sealed tube (7); Step 4: The following shield machine (2) stops after it has excavated close to the leading shield machine (1); Step 5: Open the measuring sealed tube (7), the laser transmitter (8) emits laser infrared rays to the scale plate (13), turn on the lighting device (9) to provide light source to the camera device (10), the camera device (10) takes a photo of the infrared spot image on the scale plate (13), the photo is automatically transmitted to the computer, and the deviation value between the rear shield machine (2) and the leading shield machine (1) is output; Step 6: The drill rod (6) moves backward, and the driver of the rear shield machine (2) promptly corrects the posture and route of the shield machine according to the deviation value. Each time the rear shield machine moves forward, the operation steps of step 5 are repeated until the two shield machines are accurately docked.

2. A construction method for precise control of shield underground docking according to claim 1, characterized in that: The scale plate (13) on the cutter head (12) of the subsequent shield machine is designed according to the operating space after the preceding shield machine (1) is disassembled. The three scale plates (13) shall not be on the same line. The scale plate (13) is formed by notching on the cutter head panel.

3. A construction method for precise control of shield underground docking according to claim 2, characterized in that: Score diameter D o The following formula is satisfied to ensure that the projection of the drill rod (6) on the cutterhead of the rear shield machine (2) is always within the range of the scale plate (13): Wherein ΔL represents the measurement error from the two tunnels to the butt joint section; D1 represents the diameter of the drill rod (6).

4. A construction method for precise control of shield underground docking according to claim 1, characterized in that: A flushing nozzle device (14) is installed near the scale plate (13) on the cutter head (12) of the rear shield machine. The flushing nozzle device (14) is retracted inside the cutter head during the tunneling process of the shield machine. After the shield machine is stopped, the flushing nozzle device (14) is pushed out by a hydraulic jack to flush the soil on the surface of the scale plate (13).

5. A construction method for precise control of shield underground docking according to claim 4, characterized in that: The flushing nozzle device (14) satisfies the following formula to ensure that the dirt on the dial (13) is flushed clean: Wherein, H0 represents the extension distance of the hydraulic device to push the flushing nozzle device (14), h0 represents the thickness of the cutterhead (12) of the rear shield machine, h1 represents the distance of the flushing nozzle extending out of the cutterhead or retracting into the cutterhead, L0 represents the distance between the flushing nozzle and the notch, P0 represents the water pressure of the flushing nozzle, and D o Indicates the notch diameter.

6. A construction method for precise control of shield underground docking according to claim 1, characterized in that: The water-stop ball valve device (5) is fully welded to the pressure baffle plate (3) of the preceding shield machine, using fillet welds, and the fillet weld strength meets the following requirements: P1≥1.5P2 Wherein P1 represents the fillet weld strength, and P2 represents the water and soil pressure outside the shield machine at the water stop ball valve device (5).

7. A construction method for precise control of shield underground docking according to claim 1, characterized in that: In order to satisfy the light source requirements of the camera device (10), the installation position must meet the following requirements: L1 ≥ D1ctanα / K1 Wherein L1 represents the distance from the lighting device to the organic glass, α represents the angle between the light-emitting point of the lighting device and the bottom of the organic glass, K1 represents the safety factor, and D1 represents the diameter of the drill rod (6).

8. A construction method for precise control of shield underground docking according to claim 1, characterized in that: The coordinates of the first drilling hole on the pressure baffle (3) of the leading shield machine are (x1, y1, z1), the coordinates of the second drilling hole are (x2, y2, z2), and the coordinates of the third drilling hole are (x3, y3, z3). The coordinates of the laser spot on the dial (13) corresponding to the first drilling hole of the trailing shield machine are (x 11 ,y 11 , z 11 ), the coordinates of the laser spot on the dial (13) corresponding to the second drilling hole are (x 22 ,y 22 , z 22 ), the coordinates of the laser spot on the dial (13) corresponding to the third drilling hole are (x 33 ,y 33 , z 33 ), the relationship between the coordinates of the two shield machines satisfies: where x i ,y i 、z i represent the horizontal, vertical and longitudinal coordinates (i=1, 2, 3) of the i-th borehole on the pressure baffle (3) of the leading shield machine, respectively. ii ,y ii 、z ii represents the horizontal, vertical and longitudinal coordinates of the laser spot on the scale plate (13) corresponding to the i-th drilling hole of the subsequent shield machine (i = 1, 2, 3), Δx i represents the horizontal distance from the horizontal coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate (13), Δy i represents the vertical distance from the vertical coordinate of the laser spot corresponding to the i-th drilling hole to the center of the scale plate (13), Δz i Indicates the length of the drill rod (6) from the i-th hole drilled by the leading shield machine (1) to the corresponding scale plate (13) of the trailing shield machine.

9. A construction method for precise control of shield underground docking according to claim 8, characterized in that: The angle between the trailing shield machine (2) and the leading shield machine (1) at the stopping position satisfies: Where θ represents the angle between the leading shield machine (1) and the trailing shield machine (2), the plane normal vector of the leading shield machine (1) is (l1, m1, n1), and the plane normal vector of the trailing shield machine (2) is (l2, m2, n2), l j 、m j 、n j They are dimensionless coefficients (j=1,2) and are obtained according to the following formula:

10. A construction method for precise control of shield underground docking according to claim 9, characterized in that: The lateral deviation of the rear shield machine (2) from the center satisfies: Wherein, Δx0 represents the lateral distance of the center deviation of the rear shield machine (2), Δx1 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the first drilling hole to the center of the scale plate (13), and Δx2 represents the lateral distance from the lateral coordinate of the laser spot corresponding to the second drilling hole to the center of the scale plate (13); The vertical deviation of the rear shield machine (2) from the center satisfies: Wherein, Δy0 represents the vertical distance of the center deviation of the following shield machine, Δy1 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the first drill hole to the center of the dial (13), Δy3 represents the vertical distance from the vertical coordinate of the laser spot corresponding to the third drill hole to the center of the dial (13), and θ represents the angle between the leading shield machine (1) and the following shield machine (2).

Images