Pipe Jacking Section Monitoring Method

Abstract

The present application discloses a jacking pipe cross-section monitoring method, which uses a pipeline stress monitoring device. The pipeline stress monitoring device includes an installation cylinder and installation rings fixed at both ends of the installation cylinder. An ultrasonic stress detector is fixedly embedded in the installation cylinder, and sealed air pressure seats are fixedly arranged on the outer wall of the installation cylinder in an annular array. Among them, a plurality of flatness detection components for detecting the inner wall of the pipeline are fixedly arranged on the side wall of the installation cylinder in an annular array. An ultrasonic detection probe connected to the ultrasonic stress detector is adjustably installed in the sealed air pressure seat. Expansion frames slidably inserted into the installation cylinder are arranged on the outer walls of both installation rings. Rollers are rotatably installed in the expansion frames. Bolts for fixing the expansion frames are arranged on the side wall of the installation cylinder.

Description

Technical Field

[0001] The present invention relates to the field of tunnel construction, and particularly to a method for monitoring the cross-section of a jacking pipe. Background Art

[0002] At present, pipe jacking construction is an important method for building tunnels. During the pipe jacking operation, when the pipeline passes through complex strata, it will be subjected to greater stress. At present, the detection method for pipeline stress concentration is still in the research stage, and it has not played an effective preventive role in pipeline safety problems. Therefore, accurately detecting pipeline stress concentration is an important means to prevent later tunnel problems. The patent publication document CN205139080U discloses a device for detecting pipeline stress using the magnetic memory method. The device includes a signal acquisition module, a signal conversion module, a microprocessor, a fixed-distance signal generating device, a signal transmitting module, and a touch screen. The signal acquisition module transmits the acquired signal to the signal conversion module, and the signal conversion module converts the received analog signal into a digital signal and then transmits it to the microprocessor. The fixed-distance signal generating device transmits the distance signal to the microprocessor in real time. The microprocessor processes the received signal and then transmits it to the signal transmitting module and the touch screen respectively. However, in actual operation, because the magnetic field intensity of the geomagnetic field is very low, the magnetic field inside the material is extremely vulnerable to the interference of the magnetic field formed by other electronic devices in the environment. Moreover, when the pipeline is affected by stress, it will show depressions and protrusions. The depressions and protrusions in the inner wall of the pipeline will affect the stress detection in the pipeline, resulting in the detection device being unable to distinguish the stress of the pipeline and the deformation of the pipe wall, and further leading to incorrect detection data. Summary of the Invention

[0003] In view of the above problems, the present method aims to solve the problem that in the prior art, because the magnetic field intensity of the geomagnetic field is very low, the magnetic field inside the material is extremely vulnerable to interference, and when the pipeline is affected by stress, it will show depressions and protrusions. The depressions and protrusions in the inner wall of the pipeline will affect the stress detection in the pipeline, resulting in the detection device being unable to distinguish the stress of the pipeline and the deformation of the pipe wall, and further leading to incorrect detection data. A method for monitoring the cross-section of a jacking pipe is proposed.

[0004] The technical solution adopted by the present invention is as follows:

[0005] A pipeline stress detection device and method, the pipeline stress detection device and method including an installation cylinder and installation rings fixed at both ends of the installation cylinder. An ultrasonic stress detector is fixedly embedded in the installation cylinder, and sealing air pressure seats are fixedly arranged on the outer wall of the installation cylinder in an annular array. Multiple flatness detection components for detecting the inner wall of the pipeline are fixedly arranged on the side wall of the installation cylinder in an annular array. An ultrasonic detection probe connected to the ultrasonic stress detector is adjustably installed in the sealing air pressure seat. Telescopic frames slidably inserted into the installation cylinder are arranged on the outer walls of both installation rings. Rollers are rotatably installed in the telescopic frames. Bolts for fixing the telescopic frames are arranged on the side wall of the installation cylinder.

[0006] When using the pipeline stress detection device and method of this technical solution, by providing adjustable rollers and ultrasonic detection probes on the installation cylinder, the positions of the rollers and ultrasonic detection probes are adjusted according to the inner diameter size of the pipeline to be detected. The rollers contact the inner wall of the pipeline and move along the inner wall of the pipeline. During the movement, the ultrasonic detection probe detects the stress condition of the pipeline, avoiding interference caused by the magnetic field intensity of the geomagnetic field during the detection process. At the same time, the bolts are threadedly inserted into screw holes at different positions on the side wall of the telescopic frame to adjust the position of the rollers, which is suitable for detecting pipelines with different inner diameters. By arranging flatness detection components on the installation cylinder in an annular array, when the telescopic rod on the flatness detection component contacts the protrusion on the pipe wall, it is squeezed and retracted into the fixed pipe. When the telescopic rod contacts the depression on the inner wall of the pipeline, the elastic force of the spring pushes the telescopic rod to move outward. During the process of the telescopic rod being affected by the inner wall of the pipeline and moving, the first electrode plate and the second electrode plate come into contact with each other and generate an electrical signal after contact. The ultrasonic stress detector records the electrical signal at this position, thus avoiding the influence of depressions and protrusions in the inner wall of the pipeline on the stress detection in the pipeline and improving the accuracy of the detection data.

[0007] Optionally, a support cylinder for supporting the ultrasonic stress detector is embedded in the installation cylinder, and a plurality of connection parts fixed to the installation cylinder are installed on the outer wall of the support cylinder.

[0008] Optionally, a display screen is installed on one side of the ultrasonic stress detector, and a plurality of heat dissipation slots are opened on the other side of the ultrasonic stress detector.

[0009] Optionally, the bottom end of the ultrasonic detection probe is tightly inserted into the sealing air pressure seat, and a connecting pipe is fixed between two adjacent sealing air pressure seats.

[0010] Optionally, an air pump is arranged on the outer wall of the installation cylinder, and the air pump is communicated with the connecting pipe.

[0011] Optionally, a groove for accommodating the roller is opened on the telescopic frame, and screw holes connected to the bolts are equidistantly opened on the side wall of the telescopic frame.

[0012] Optionally, the flatness detection assembly includes a fixed rod fixed to the mounting cylinder and a telescopic rod slidably inserted into the fixed rod, and a spring abutting against the telescopic rod is embedded in the fixed rod.

[0013] Optionally, an arc-shaped contact portion contacting the inner wall of the pipe is provided on the telescopic rod, and a first electrode plate is embedded at equal intervals at one end of the telescopic rod extending into the fixed rod, and a second electrode plate fixed to the inner wall of the fixed rod is located between the two first electrode plates.

[0014] Optionally, adjust the positions of the roller and the ultrasonic detection probe according to the inner diameter size of the detected pipe, and debug the ultrasonic transmitting probe and the ultrasonic receiving probe in the ultrasonic detection probe so that the ultrasonic detection depth corresponds to the wall thickness of the pipe, and the detection depth is between millimeters;

[0015] The roller contacts the inner wall of the pipe and moves along the inner wall of the pipe. There is an inherent relationship between the ultrasonic velocity and the stress. The ultrasonic stress detector converts this characteristic into a digital signal representation and displays it on the display screen.

[0016] Optionally, the movement of the roller in the pipe causes the flatness detection assembly to move synchronously. The telescopic rod on the flatness detection assembly is affected by the protrusions on the inner wall of the pipe and the spring and expands and contracts in the fixed pipe, and when expanding and contracting, the first electrode plate contacts the second electrode plate to generate a detection signal.

[0017] The beneficial effects of the present invention are:

[0018] 1. By providing an adjustable roller and an ultrasonic detection probe on the mounting cylinder, adjusting the positions of the roller and the ultrasonic detection probe according to the inner diameter size of the detected pipe, the roller contacts the inner wall of the pipe and moves along the inner wall of the pipe, and during the movement, the ultrasonic detection probe detects the stress condition of the pipe, avoiding the interference of the magnetic field intensity of the geomagnetic field on the detection during the detection process. At the same time, the bolt is threadedly inserted into the screw holes at different positions on the side wall of the telescopic frame, thereby adjusting the position of the roller, which is suitable for the detection of pipes with different inner diameters;

[0019] 2. By annularly arraying flatness detection assemblies on the mounting cylinder, when the telescopic rod on the flatness detection assembly contacts the protrusion on the pipe wall, it is squeezed and contracted into the fixed pipe. When the telescopic rod contacts the depression on the inner wall of the pipe, the elastic force of the spring pushes the telescopic rod to move outwards. During the movement of the telescopic rod affected by the inner wall of the pipe, the first electrode plate and the second electrode plate contact each other and generate an electrical signal after contact. The ultrasonic stress detector records the electrical signal at this position, thereby avoiding the influence of the depressions and protrusions in the inner wall of the pipe on the stress detection in the pipe and improving the accuracy of the detection data. Brief Description of the Drawings

[0020] Figure 1 It is a schematic structural diagram of a pipeline stress monitoring device;

[0021] Figure 2 It is a schematic internal structure diagram of the installation cylinder;

[0022] Figure 3 It is a schematic structural diagram of the sealed air pressure seat;

[0023] Figure 4 It is a schematic structural diagram of the telescopic frame;

[0024] Figure 5 It is a schematic internal structure diagram of the flatness detection component;

[0025] Figure 6 It is Figure 5 The enlarged schematic diagram of the structure at position A in

[0026] The reference numerals in the figure are: 1. Installation cylinder; 2. Ultrasonic stress detector; 3. Support cylinder; 4. Telescopic frame; 5. Connection part; 6. Roller; 7. Ultrasonic detection probe; 8. Flatness detection component; 9. Installation ring; 10. Heat dissipation groove; 11. Bolt; 12. Air pump; 13. Connecting pipe; 14. Sealed air pressure seat; 15. Groove; 16. Screw hole; 17. Arc contact part; 18. Telescopic rod; 19. Spring; 20. Telescopic groove; 21. Fixed rod; 22. First electrode plate; 23. Second electrode plate. Detailed Embodiment

[0027] The present invention will be described in detail below with reference to the accompanying drawings.

[0028] Embodiment 1

[0029] A pipeline stress monitoring device during tunnel pipe jacking construction.

[0030] Refer to the attached Figure 1 ~Attached Figure 6As shown in the figure, the pipeline stress detection device and method include an installation cylinder 1 and installation rings 9 fixed at both ends of the installation cylinder 1. An ultrasonic stress detector 2 is embedded and fixed in the installation cylinder 1, and sealing air pressure seats 14 are fixedly arranged on the outer wall of the installation cylinder 1 in an annular array. Among them, a plurality of flatness detection components 8 for detecting the inner wall of the pipeline are fixedly arranged on the side wall of the installation cylinder 1 in an annular array. An ultrasonic detection probe 7 connected to the ultrasonic stress detector 2 is adjustably installed in the sealing air pressure seat 14. Telescopic frames 4 are slidably inserted into the outer walls of both installation rings 9. Rollers 6 are rotatably installed in the telescopic frames 4. Among them, bolts 11 for fixing the telescopic frames 4 are arranged on the side wall of the installation cylinder 1. The positions of the rollers 6 and the ultrasonic detection probe 7 are adjusted according to the inner diameter size of the detected pipeline. The rollers 6 are in contact with the inner wall of the pipeline and move along the inner wall of the pipeline. During the movement, the ultrasonic detection probe 7 detects the stress condition of the pipeline, avoiding interference caused by the magnetic field intensity of the geomagnetic field during the detection process. At the same time, the bolts 11 are threadedly inserted into screw holes 16 at different positions on the side wall of the telescopic frame 4, thereby adjusting the position of the rollers 6, which is applicable to the detection of pipelines with different inner diameters.

[0031] Among them, a support cylinder 3 for supporting the ultrasonic stress detector 2 is embedded in the installation cylinder 1. A plurality of connecting parts 5 fixed to the installation cylinder 1 are installed on the outer wall of the support cylinder 3. The connecting parts 5 keep the support cylinder 3 fixed in the installation cylinder 1. The bottom end of the inner wall of the support cylinder 3 is horizontally arranged. The acoustic wave stress detector is fixedly connected to the horizontal inner wall of the support cylinder 3. A display screen is installed on one side surface of the ultrasonic stress detector 2, and a plurality of heat dissipation grooves 10 are opened on the other side surface of the ultrasonic stress detector 2. The detection data of the ultrasonic wave and the electrical signal when the first electrode plate 22 contacts the second electrode plate 23 are recorded and displayed through the display screen.

[0032] The bottom end of the ultrasonic detection probe 7 is tightly inserted into the sealing air pressure seat 14. A connecting pipe 13 is fixed between two adjacent sealing air pressure seats 14. An air pump 12 is arranged on the outer wall of the installation cylinder 1. The air pump 12 is connected to the connecting pipe 13 in communication. After the air pump 12 is started, air is injected into the sealing extrusion seats through a plurality of connecting pipes 13, so that the air pressure inside the sealing air pressure seat 14 rises. During the rising process, the ultrasonic detection probe 7 is pushed to slide outwards. After the air pump 12 pumps out the air in the sealing air pressure seat 14, the negative pressure in the sealing air pressure seat 14 causes the ultrasonic detection probe 7 to contract inward, thereby adjusting the position of the ultrasonic detection probe 7.

[0033] The telescopic frame 4 is provided with a groove 15 for accommodating the roller 6, and screw holes 16 connected to the bolts 11 are equidistantly arranged on the side wall of the telescopic frame 4. The flatness detection assembly 8 includes a fixed rod 21 fixed to the mounting cylinder 1 and a telescopic rod 18 slidably inserted into the fixed rod 21. A telescopic groove 20 is arranged in the hollow cavity of the fixed rod 21, and a spring 19 abutted against the telescopic rod 18 is arranged in the telescopic groove 20. An arc-shaped contact portion 17 contacting the inner wall of the pipeline is arranged on the telescopic rod 18, and first electrode plates 22 are equidistantly embedded at one end of the telescopic rod 18 extending into the fixed rod 21. A second electrode plate 23 located between the two first electrode plates 22 is fixed to the inner wall of the fixed rod 21. When the telescopic rod 18 on the flatness detection assembly 8 contacts the protrusion on the pipe wall, it is squeezed and contracted into the fixed pipe. When the telescopic rod 18 contacts the depression on the inner wall of the pipeline, the elastic force of the spring 19 pushes the telescopic rod 18 to move outwards. During the process that the telescopic rod 18 is affected by the inner wall of the pipeline and moves, the first electrode plate 22 and the second electrode plate 23 contact each other and generate an electrical signal after contact. The ultrasonic stress detector 2 records the electrical signal at this position, thus avoiding the influence of the depressions and protrusions in the inner wall of the pipeline on the stress detection in the pipeline. During the actual use process, the flatness detection assemblies 8 are numbered on the display screen of the ultrasonic stress detector 2, so as to record the positions of the depressions and protrusions on the inner wall of the pipeline more accurately.

[0034] Adjust the positions of the roller 6 and the ultrasonic detection probe 7 according to the inner diameter size of the detected pipeline, and debug the ultrasonic transmitting probe and the ultrasonic receiving probe in the ultrasonic detection probe 7 to make the ultrasonic detection depth correspond to the wall thickness of the pipeline. The detection depth is between millimeters and millimeters; the roller 6 contacts the inner wall of the pipeline and moves along the inner wall of the pipeline. There is an inherent relationship between the ultrasonic velocity and the stress. The ultrasonic stress detector 2 converts this characteristic into a digital signal representation and displays it on the display screen. The roller 6 moves in the pipeline to synchronously move the flatness detection assembly 8. The telescopic rod 18 on the flatness detection assembly 8 expands and contracts in the fixed pipe under the influence of the protrusion on the inner wall of the pipeline and the spring 19, and makes the first electrode plate 22 and the second electrode plate 23 contact to generate a detection signal when expanding and contracting.

[0035] Embodiment 2

[0036] A method for monitoring the cross-section of a jacking pipe. This method is actually to monitor the stress at the cross-section of the jacking pipe during the jacking pipe construction. This method needs to use the device shown in Embodiment 1.

[0037] Adjust the positions of the roller 6 and the ultrasonic detection probe 7 according to the inner diameter size of the detected pipeline. The roller 6 contacts the inner wall of the pipeline and moves along the inner wall of the pipeline. During the movement, the ultrasonic detection probe 7 detects the stress condition of the pipeline, avoiding the interference of the magnetic field intensity of the geomagnetic field on the detection during the detection process. At the same time, the bolt 11 is threadedly inserted into the screw holes 16 at different positions on the side wall of the telescopic frame 4 to adjust the position of the roller 6. When the telescopic rod 18 on the flatness detection assembly 8 contacts the protrusion on the pipe wall, it is squeezed and retracted into the fixed pipe. When the telescopic rod 18 contacts the depression on the inner wall of the pipeline, the elastic force of the spring 19 pushes the telescopic rod 18 to move outward. During the process that the telescopic rod 18 is affected by the inner wall of the pipeline and moves, the first electrode plate 22 and the second electrode plate 23 contact each other and generate an electrical signal after the contact. The ultrasonic stress detector 2 records the electrical signal at this position.

[0038] The above are only the preferred embodiments of the present invention, and thus do not limit the patent protection scope of the present invention. Any equivalent transformation made by using the content of the specification of the present invention, directly or indirectly applied in other related technical fields, shall be included in the protection scope of the present invention by the same token.

Claims

1. A jacking pipe cross-section monitoring method using a pipeline stress monitoring device, characterized in that, The pipeline stress monitoring device includes an installation cylinder and installation rings fixed at both ends of the installation cylinder. An ultrasonic stress detector is fixedly embedded in the installation cylinder, and sealed air pressure seats are fixedly arranged on the outer wall of the installation cylinder in a circular array. A plurality of flatness detection components for detecting the inner wall of the pipeline are fixedly arranged on the side wall of the installation cylinder in a circular array. An ultrasonic detection probe connected to the ultrasonic stress detector is adjustably installed in the sealed air pressure seat. Telescopic frames that are slidably inserted into the installation cylinder are arranged on the outer walls of the two installation rings. Rollers are rotatably installed in the telescopic frames. Bolts for fixing the telescopic frames are arranged on the side wall of the installation cylinder; During monitoring, the positions of the rollers and the ultrasonic detection probe are adjusted according to the inner diameter size of the detected pipeline, and the ultrasonic transmitting probe and the ultrasonic receiving probe in the ultrasonic detection probe are debugged so that the ultrasonic detection depth corresponds to the wall thickness of the pipeline, and the detection depth is between 3 mm and 10 mm; The rollers contact the inner wall of the pipeline and move along the inner wall of the pipeline. There is an inherent relationship between the ultrasonic velocity and the stress. The ultrasonic stress detector converts this characteristic into a digital signal representation and displays it on the display screen. The movement of the rollers in the pipeline causes the flatness detection components to move synchronously. The telescopic rods on the flatness detection components are affected by the protrusions on the inner wall of the pipeline and the springs and expand and contract in the fixed pipes. When expanding and contracting, the first electrode plate contacts the second electrode plate to generate a detection signal.

2. The pipe jacking cross-section monitoring method according to claim 1, characterized in that, A support cylinder for supporting the ultrasonic stress detector is embedded in the installation cylinder, and a plurality of connecting parts fixed to the installation cylinder are installed on the outer wall of the support cylinder.

3. The pipe jacking cross-section monitoring method according to claim 1, characterized in that, A display screen is installed on one side surface of the ultrasonic stress detector, and a plurality of heat dissipation slots are opened on the other side surface of the ultrasonic stress detector.

4. The pipe jacking cross-section monitoring method according to claim 1, characterized in that, The bottom end of the ultrasonic detection probe is tightly inserted into the sealed air pressure seat, and a connecting pipe is fixed between two adjacent sealed air pressure seats.

5. The pipe jacking cross-section monitoring method according to claim 4, characterized in that An air pump is arranged on the outer wall of the installation cylinder, and the air pump is communicated with the connecting pipe.

6. The pipe jacking cross-section monitoring method according to claim 1, characterized in that, A groove for accommodating the roller is opened on the telescopic frame, and screw holes connected to the bolts are equidistantly opened on the side wall of the telescopic frame.

7. The pipe jacking cross-section monitoring method according to claim 1, characterized in that The flatness detection component includes a fixed rod fixed to the installation cylinder and a telescopic rod slidably inserted into the fixed rod. A spring that abuts against the telescopic rod is embedded in the fixed rod.

8. The pipe jacking cross-section monitoring method according to claim 7, wherein, An arc-shaped contact part that contacts the inner wall of the pipeline is arranged on the telescopic rod, and first electrode plates are equidistantly embedded at one end of the telescopic rod extending into the fixed rod. A second electrode plate located between the two first electrode plates is fixed to the inner wall of the fixed rod.

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