System and method for detecting quality of grouting in shield construction

Abstract

The present application relates to the technical field of grouting quality detection, and particularly discloses a system and method for grouting quality detection in shield construction, comprising a detection system installed at a shield tail of a shield machine, the detection system comprising a connecting ring, a ring-shaped shell and a ring-shaped support coupling surface, a connecting piece being fixedly connected to a front end of the connecting ring, the connecting piece being detachably connected to the shield tail through bolt connection, the ring-shaped shell being fixedly connected to a rear end of the connecting ring, the rear end of the ring-shaped shell being fixedly connected to a front end of the support coupling surface, an inner side of the ring-shaped shell being a closed ring-shaped cavity, and the ring-shaped cavity being filled with ultrasonic coupling liquid, air existing between a contact surface of the detection piece and the detection end seriously affecting the effect of ultrasonic detection, in the present application, not only can the interference of steel bars in the segment during ultrasonic detection in the prior art be avoided, but also the pressure during grouting can be used as coupling force to realize pore-free coupling, thereby increasing the effect of ultrasonic detection.

Description

Technical Field

[0001] This invention relates to the field of grouting quality testing technology, specifically to a system and method for testing the grouting quality of shield tunneling construction. Background Technology

[0002] After the grouting between the tunnel segments and the soil and rock mass is completed, the grouting quality of the annular grouting body needs to be tested to ensure that there are no voids inside the grouting body and that the density is close. This quality test is especially necessary for shield tunnels in karst areas.

[0003] Existing detection methods can be performed using non-contact methods such as ultrasonic testing, ground-penetrating radar, or shock waves, but all of them have a problem, such as... Figure 1 As shown, the grouting body 2 is located between the pipe segment 3 and the soil and rock mass 1. Because a large number of steel bars 4 are inserted inside the pipe segment 3, if non-destructive testing is performed from the inside of the pipe segment 3, the presence of steel bars 4 will seriously reduce the signal-to-noise ratio during the testing process, thus affecting the quality of the testing.

[0004] Therefore, a system and method for detecting the grouting quality during shield tunneling are proposed to address the above-mentioned problems. Summary of the Invention

[0005] The purpose of this invention is to provide a system and method for detecting the grouting quality in tunnel boring machine (TBM) construction. The detection system is connected to the tail of the TBM, which replaces the tail to seal the grouting area while avoiding interference from the detection of reinforcing steel. Most importantly, it can use the pressure during grouting to make the coupling surface adhere tightly to the surface of the grouting body, avoiding the problem of the coupling agent not being able to completely expel air gaps due to the roughness of the grouting body surface in the existing ultrasonic detection method, thereby further improving the detection effect.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a system for detecting the grouting quality of shield tunneling, including a detection system installed at the tail of the shield machine, the detection system including a connecting ring, an annular shell and an annular support coupling surface;

[0007] The front end of the connecting ring is fixedly connected to a connector, which is detachably connected to the shield tail by bolts. The annular shell is fixedly connected to the rear end of the connecting ring, and the rear end of the annular shell is fixedly connected to the front end of the supporting coupling surface. The inner side of the annular shell is a closed annular cavity filled with ultrasonic coupling fluid. The supporting coupling surface is made of non-metallic material, such as ceramic or tempered glass.

[0008] A slider is slidably connected to the rear side of the connecting ring, and a detection probe is installed on one side of the slider. The detection probe emits ultrasonic waves to the rear end to achieve ultrasonic detection; the detection probe is an ultrasonic probe with integrated transceiver.

[0009] Both the inner and outer sides of the support coupling surface are fixedly connected with pressure-bearing sealing rings. During grouting, under pressure, the support coupling surface and the pressure-bearing sealing rings act as sealing surfaces, and the grout will firmly adhere to the flat support coupling surface, thereby avoiding the presence of air on the coupling surface and ensuring the effectiveness of ultrasonic testing.

[0010] Because air at the contact surface between the test piece and the test end can severely affect the ultrasonic testing effect, this invention not only avoids the interference of the steel bars in the pipe segment during ultrasonic testing in the prior art, but also utilizes the pressure of the grouting itself as the coupling force to achieve pore-free coupling, thereby increasing the ultrasonic testing effect.

[0011] The grouting of the present invention is carried out through the grouting holes on the pipe segment, which is the prior art and will not be elaborated here. Due to the variability of karst areas, the present invention can perform ultrasonic testing during the grouting stage and after molding.

[0012] Because the four sides of the area to be grouted are the soil and rock mass, the pipe segment, the grouting body at the rear end, and the detection system in this invention; ensuring a good seal can guarantee the grouting pressure, and the grouting pressure can make the grout adhere tightly to the supporting coupling surface, so that the detection probe and the grout can have good coupling contact, thereby realizing ultrasonic detection. This not only eliminates the coupling step, but also greatly ensures the uniformity of coupling compared to the application of coupling liquid in the prior art.

[0013] The detection system in this invention is installed at the tail of the tunnel boring machine (TBM). The electric and hydraulic driving force is provided by the TBM and can be achieved using existing technology, which will not be elaborated here. When in use, it moves forward with the TBM according to the rhythm of the segment installation to achieve detection of the entire tunneling section.

[0014] After each section of the tunnel boring machine advances, the tunnel segments are installed, followed by grouting, and then the grouting is checked simultaneously. This process is repeated sequentially.

[0015] In the grouting stage, the present invention grouts the area to be grouted. Because the grouting stage requires maintaining the grouting pressure for a period of time to allow the grout to penetrate the rock and soil, ultrasonic testing is performed during this stage to detect problems in advance and make timely corrections.

[0016] Ultrasonic testing after molding can detect problems relatively quickly and allow for secondary slurry filling.

[0017] Two ultrasound examinations at different times can be performed to further ensure the accuracy of the examination;

[0018] In this invention, the rear end surfaces of the pressure-bearing sealing ring and the supporting coupling surface are both provided with a coating that facilitates demolding;

[0019] As a preferred embodiment of the system for detecting the grouting quality of shield tunneling in this invention, the pressure sealing ring is made of rubber, the cross-section of the pressure sealing ring is triangular, the front end of the pressure sealing ring can be supported, the side of the pressure sealing ring away from the support coupling surface is the outer top surface, the rear end of the pressure sealing ring is the side concave surface, and the inner side of the pressure sealing ring is the liquid cavity.

[0020] Under the pressure of grouting, the rear end of the pressure-bearing sealing ring can compress the concave side. Because the front end of the pressure-bearing sealing ring is restricted by the outer or inner support ring, the outer top surface will be tightly attached to the rock and soil or the outside of the segment, thus achieving a sealing and plugging effect. The pressure of grouting is converted into the tension of the outer top surface to the outside, increasing the sealing effect.

[0021] As a preferred embodiment of the shield tunneling grouting quality detection system of the present invention, the inner and outer sides of the annular shell are fixedly connected with support pipes, the rear end of the outer support pipe is fixedly connected with an outer support ring, the rear end of the inner support pipe is fixedly connected with an inner support ring, and the outer support ring and the inner support ring are respectively supported on the front end of the outer and inner pressure sealing rings.

[0022] In this invention, the support tube is used for the entry and exit of liquid in the liquid cavity and for connecting the outer support ring and the inner support ring, thereby achieving effective support for the front end of the pressure-bearing sealing ring.

[0023] As a preferred embodiment of the shield tunneling grouting quality detection system of the present invention, the two ends of the support pipe are respectively connected to the inner side of the annular cavity and the inner side of the liquid cavity. Multiple hydraulic rods are fixedly connected to the inner side of the front end of the connecting ring. The movable end of the hydraulic rod can extend into or out of the annular cavity. The amount of liquid in the liquid cavity can be adjusted by the movement of the movable end, thereby further adjusting the sealing performance.

[0024] In this invention, the amount of liquid in the hydraulic cavity can be adjusted by retracting the hydraulic rod. A higher volume of liquid results in a better seal. It is important to note that sufficient liquid must be present in the cavity before grouting to ensure a proper seal.

[0025] When moving the detection system, the amount of liquid in the liquid chamber can be reduced, thereby reducing the friction between the pressure-bearing sealing ring and the soil and tunnel segments, allowing the detection system to move smoothly.

[0026] As a preferred embodiment of the shield tunneling grouting quality detection system of the present invention, a slide rail is fixedly connected to the rear side of the connecting ring, a slider is slidably connected to the surface of the slide rail, a first motor is fixedly connected to the inner side of the slider, and a traveling wheel is fixedly connected to the end of the main shaft of the first motor. The traveling wheel rotates on the rear end surface of the connecting ring to realize the movement of the detection probe in the annular cavity, thereby realizing the overall detection of the annular grouting body.

[0027] The slide rail serves as the sliding track for the slider. The slide rail is circular. When the first motor rotates, it drives the traveling wheel to rotate. The traveling wheel travels on the rear end surface of the connecting ring along the circular track, driving the detection probe to move along the trajectory, thereby achieving overall detection of the grouting area.

[0028] To prevent slippage between the traveling wheel and the rear end surface of the connecting ring, the traveling wheel can be made of gears, while the rear end surface of the connecting ring has a toothed ring, so that the gear-shaped traveling wheel meshes with the toothed ring surface, achieving the circular motion of the slider while rotating.

[0029] As a preferred embodiment of the system for detecting the grouting quality during shield tunneling construction according to the present invention, the outer side of the traveling wheel is made of rubber and makes interference contact with the rear end surface of the connecting ring to increase friction.

[0030] As a preferred embodiment of the shield tunneling grouting quality detection system of the present invention, a second motor is fixedly connected to the inner rear end of the slider, and a turntable is fixedly connected to the end of the main shaft of the second motor. The detection probe is fixed on the turntable by a shaft, and the shaft of the detection probe is not located at the center of the turntable.

[0031] In this invention, in order to further increase the detection range, a second motor is also provided. When the second motor rotates, it can drive the turntable and the detection probe to rotate. And because the axis of the detection probe is not the same as the axis of the second motor, when the second motor rotates, the detection probe will rotate eccentrically, thereby increasing the upper and lower range of the detection coverage of the detection probe and realizing ultrasonic detection of the entire grouting position.

[0032] The detection principle of the detection probe is implemented using existing technology, and will not be elaborated further here;

[0033] As a preferred embodiment of the system for detecting the grouting quality of shield tunneling construction according to the present invention, an elastic layer is attached to the rear end of the supporting coupling surface, and an electromagnetic valve is fixedly connected to the inner side of the outer edge of the supporting coupling surface. When the electromagnetic valve is opened, the coupling fluid can enter the inner side of the elastic layer to form a compensation gap composed of the coupling fluid.

[0034] Because the solidified slurry will shrink slightly, the solenoid valve is opened to allow the coupling fluid to enter the elastic layer. This is used to compensate for the slight shrinkage of the solidified slurry, ensure the coupling effect, and ensure the ultrasonic testing effect, so as to realize ultrasonic testing after the slurry is formed.

[0035] When the movable end of the hydraulic rod retracts, the solenoid valve can be opened again to allow the coupling fluid in the compensation gap to flow back.

[0036] Method for detecting grouting quality after shield tunneling in karst formations: During the grouting stage, under pressure, the supporting coupling surface and the pressure-bearing sealing ring act as sealing surfaces, and the grout will firmly adhere to the flat supporting coupling surface, thereby avoiding the presence of air on the coupling surface. Ultrasonic detection is achieved by emitting ultrasonic waves to the rear end through a detection probe to ensure the effectiveness of ultrasonic detection.

[0037] If cavities or low-density areas are found, the grouting pressure and flow rate should be adjusted promptly.

[0038] As a preferred method for detecting the grouting quality after shield tunneling in karst formations according to the present invention, after the grout solidifies, because the solidified grout will slightly shrink, at this time, the solenoid valve is opened to allow the coupling fluid to enter the elastic layer to compensate for the slight shrinkage of the solidified grout, ensure the coupling effect, and ensure the effect of ultrasonic detection.

[0039] Compared with the prior art, the beneficial effects of the present invention are:

[0040] 1. The system for detecting the grouting quality in tunnel boring machine (TBM) construction addresses the issue that air at the contact surface between the test piece and the test end can severely affect the effectiveness of ultrasonic testing. This invention not only avoids interference from the reinforcing steel bars in the tunnel segments during ultrasonic testing as in existing technologies, but also utilizes the pressure of the grout itself as a coupling force. This eliminates the need for coupling steps and, compared to applying coupling fluid in existing technologies, greatly ensures uniform coupling, achieving pore-free coupling and thus enhancing the effectiveness of ultrasonic testing.

[0041] 2. The system for detecting the grouting quality in shield tunneling construction has four sides for the area to be grouted: the soil and rock mass, the tunnel segment, the grouting body at the rear end, and the detection system of this invention. Ensuring a good seal can guarantee the grouting pressure, and the grouting pressure can make the grout adhere tightly to the support coupling surface, so that the detection probe and the grout can have good coupling contact, thereby realizing ultrasonic detection.

[0042] 3. The system for detecting the grouting quality during shield tunneling construction. In the grouting stage, the area to be grouted is grouted. Because the grouting stage requires maintaining grouting pressure for a period of time to allow the grout to penetrate the rock and soil, ultrasonic testing is performed during this stage. Problems can be detected in advance and remedied in time. Ultrasonic testing is also performed after the grout has formed, which can detect problems relatively in a timely manner and allow for secondary grouting. Ultrasonic testing at two different times can be performed to further ensure the accuracy of the test.

[0043] 4. The system for detecting the grouting quality in shield tunneling construction has a pressure sealing ring whose rear end can compress the concave side under the grouting pressure. Because the front end of the pressure sealing ring is restricted by the outer or inner support ring, the outer top surface will be tightly attached to the rock and soil or the outside of the tunnel segment, thus achieving a sealing and plugging effect. The grouting pressure is converted into tension on the outer top surface to the outside, increasing the sealing effect.

[0044] 5. In this shield tunneling grouting quality inspection system, the amount of liquid in the liquid cavity can be adjusted by the contraction of the hydraulic rod. The more liquid in the liquid cavity, the better the sealing performance. It should be noted that before grouting, it is necessary to ensure that there is enough liquid in the liquid cavity to ensure sealing. When moving the inspection system, the amount of liquid in the liquid cavity can be reduced to reduce the friction between the pressure sealing ring and the rock and soil and the tunnel segments, so that the inspection system can move smoothly.

[0045] 6. In this invention, in order to further increase the detection range, a second motor is also provided in the system for detecting the grouting quality of shield tunneling. When the second motor rotates, it can drive the turntable and the detection probe to rotate. Since the axis of the detection probe is not the same as the axis of the second motor, the detection probe will rotate eccentrically when the second motor rotates, thereby increasing the upper and lower range of the detection coverage of the detection probe and realizing ultrasonic detection of the entire grouting location.

[0046] 7. In this shield tunneling grouting quality detection system, after the grout solidifies, it will slightly shrink. At this time, the solenoid valve is opened to allow the coupling fluid to enter the elastic layer to compensate for the slight shrinkage of the solidified grout, ensuring the coupling effect and the ultrasonic detection effect. Attached Figure Description

[0047] Figure 1 This diagram illustrates the drawbacks of existing nondestructive testing methods.

[0048] Figure 2 This is a schematic diagram of the detection system of the present invention installed behind the shield tail;

[0049] Figure 3 This is a side view of the detection system of the present invention;

[0050] Figure 4 This is a schematic diagram of the exploded structure of the detection system of the present invention;

[0051] Figure 5 This is a schematic cross-sectional view of the detection system of the present invention;

[0052] Figure 6 This is a schematic diagram of the internal cross-sectional structure of one side of the detection system of the present invention;

[0053] Figure 7 For the present invention Figure 6A schematic diagram of the structure at point A;

[0054] Figure 8 For the present invention Figure 6 A schematic diagram of the structure at point B;

[0055] Figure 9 This is a further structural schematic diagram of the detection system of the present invention.

[0056] In the diagram: 1. Soil and rock mass; 2. Grouting body; 3. Segment; 4. Reinforcing steel; 5. Tunnel boring machine; 6. Area to be grouted; 7. Detection system; 71. Connecting ring; 72. Annular shell; 73. Support coupling surface;

[0057] 711. Connecting component; 712. Hydraulic rod; 7121. Moving end; 713. Slide rail;

[0058] 721. Support tube; 722. Annular cavity; 723. Detection probe; 724. Outer support ring; 725. Inner support ring; 726. Slider; 727. First motor; 728. Walking wheel; 729. Second motor; 7210. Turntable;

[0059] 731, Pressure-bearing sealing ring; 7311, Outer top surface; 7312, Lateral concave surface; 7313, Liquid cavity; 732, Solenoid valve; 733, Elastic layer; 734, Compensation gap;

[0060] The side facing the working face is called the front, and the side away from the working face is called the rear. Detailed Implementation

[0061] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0062] Example 1, please refer to Figures 1-8 The present invention provides a technical solution: a system for detecting the grouting quality of shield tunneling construction, including a detection system 7 installed at the tail of the shield machine 5. The detection system 7 includes a connecting ring 71, an annular shell 72 and an annular support coupling surface 73.

[0063] The front end of the connecting ring 71 is fixedly connected to the connector 711, which is detachably connected to the shield tail by bolts. The annular shell 72 is fixedly connected to the rear end of the connecting ring 71, and the rear end of the annular shell 72 is fixedly connected to the front end of the supporting coupling surface 73. The inner side of the annular shell 72 is a closed annular cavity 722, which is filled with ultrasonic coupling fluid. The supporting coupling surface 73 is made of non-metallic material, such as ceramic or tempered glass.

[0064] A slider 726 is slidably connected to the rear side of the connecting ring 71. A detection probe 723 is installed on one side of the slider 726. The detection probe 723 emits ultrasonic waves to the rear end to achieve ultrasonic detection. The detection probe 723 is an ultrasonic probe that integrates transceiver functions.

[0065] Both the inner and outer sides of the support coupling surface 73 are fixedly connected with pressure sealing rings 731. During grouting, under the action of pressure, the support coupling surface 73 and the pressure sealing rings 731 act as sealing surfaces, and the grout will firmly adhere to the flat support coupling surface 73, thereby avoiding the presence of air on the coupling surface and ensuring the effect of ultrasonic testing.

[0066] Because air at the contact surface between the test piece and the test end can seriously affect the ultrasonic testing effect, this invention not only avoids the interference of the steel bars 4 in the pipe segment 3 during ultrasonic testing in the prior art, but also uses the pressure of the grout itself as the coupling force. This not only eliminates the coupling step, but also greatly ensures the uniformity of coupling compared to the application of coupling liquid in the prior art, achieving pore-free coupling, thereby increasing the ultrasonic testing effect.

[0067] The grouting of the present invention is carried out through the grouting holes on the segment 3, which is the prior art and will not be elaborated here. Due to the variability of karst areas, the present invention can perform ultrasonic testing during the grouting stage and after molding.

[0068] For the grouting area 6, its four sides are the soil and rock mass 1, the pipe segment 3, the grouting body 2 at the rear end, and the detection system in this invention. Ensuring a good seal can guarantee the grouting pressure, and the grouting pressure can make the grout adhere tightly to the support coupling surface 73, so that the detection probe 723 and the grout can have good coupling contact, thereby realizing ultrasonic detection.

[0069] The detection system 7 in this invention is installed at the tail of the shield machine 5. The electric and hydraulic driving force is provided by the shield machine 5 and can be implemented by existing technology, which will not be elaborated here. When in use, it moves forward with the shield machine 5 according to the rhythm of the segment 3 installation to realize the detection of the entire tunneling section.

[0070] After each section of the tunnel boring machine 5 has advanced, segment 3 is installed, followed by grouting, and then the grouting is checked simultaneously. This process is repeated sequentially.

[0071] In the grouting stage, the present invention grouts the area 6 to be grouted. Because the grouting stage requires maintaining the grouting pressure for a period of time to allow the grout to penetrate the rock and soil mass 1, ultrasonic testing is performed during this stage to detect problems in advance and make timely corrections.

[0072] Ultrasonic testing after molding can detect problems relatively quickly and allow for secondary slurry filling.

[0073] Two ultrasound examinations at different times can be performed to further ensure the accuracy of the examination;

[0074] In this invention, the rear end surfaces of the pressure-bearing sealing ring 731 and the supporting coupling surface 73 are both provided with a coating that facilitates demolding.

[0075] Specifically, the pressure sealing ring 731 is made of rubber, and the cross-section of the pressure sealing ring 731 is triangular. The front end of the pressure sealing ring 731 can be supported. The side of the pressure sealing ring 731 away from the support coupling surface 73 is the outer top surface 7311, the rear end of the pressure sealing ring 731 is the side concave surface 7312, and the inner side of the pressure sealing ring 731 is the liquid cavity 7313.

[0076] Under the grouting pressure, the rear end of the pressure-bearing sealing ring 731 can compress the concave side surface 7312. Because the front end of the pressure-bearing sealing ring 731 is restricted by the outer support ring 724 or the inner support ring 725, the outer top surface 7311 will be tightly attached to the outside of the rock and soil 1 or the pipe segment 3, thereby achieving a sealing and plugging effect. The grouting pressure is converted into the outward tension of the outer top surface 7311, which increases the sealing effect.

[0077] Specifically, the inner and outer sides of the annular shell 72 are fixedly connected to support tubes 721. The rear end of the outer support tube 721 is fixedly connected to an outer support ring 724, and the rear end of the inner support tube 721 is fixedly connected to an inner support ring 725. The outer support ring 724 and the inner support ring 725 are respectively supported on the front end of the outer and inner pressure sealing rings 731.

[0078] In this invention, the support tube 721 is used for the entry and exit of liquid in the liquid chamber 7313, and also for connecting the outer support ring 724 and the inner support ring 725, so as to effectively support the front end of the pressure-bearing sealing ring 731.

[0079] Specifically, the two ends of the support tube 721 are respectively connected to the inner side of the annular cavity 722 and the inner side of the liquid cavity 7313. Multiple hydraulic rods 712 are fixedly connected to the inner side of the front end of the connecting ring 71. The movable end 7121 of the hydraulic rod 712 can extend into or out of the annular cavity 722. The amount of liquid in the liquid cavity 7313 can be adjusted by the movement of the movable end 7121, thereby further adjusting the sealing performance.

[0080] In this invention, the amount of liquid in the liquid chamber 7313 can be adjusted by retracting the hydraulic rod 712. A higher liquid volume in the liquid chamber 7313 results in better sealing. It is important to note that before grouting, sufficient liquid must be present in the liquid chamber 7313 to ensure a proper seal.

[0081] When moving the detection system 7, the liquid in the liquid chamber 7313 can be reduced, and the friction between the pressure-bearing sealing ring 731 and the soil and rock mass 1 and the segment 3 can be reduced, so that the detection system 7 can move smoothly.

[0082] Specifically, a slide rail 713 is fixedly connected to the rear side of the connecting ring 71, and a slider 726 is slidably connected to the surface of the slide rail 713. A first motor 727 is fixedly connected to the inner side of the slider 726, and a traveling wheel 728 is fixedly connected to the end of the main shaft of the first motor 727. The traveling wheel 728 rotates on the rear surface of the connecting ring 71 to realize the movement of the detection probe 723 in the annular cavity 722, thereby realizing the overall detection of the annular grouting body 2.

[0083] The slide rail 713 serves as the sliding track for the slider 726. The sliding track is circular. When the first motor 727 rotates, it will drive the traveling wheel 728 to rotate. The traveling wheel 728 travels on the rear end surface of the connecting ring 71 in a circular track, driving the detection probe 723 to move along the track, thereby realizing the overall detection of the grouting area.

[0084] To prevent slippage between the traveling wheel 728 and the rear end surface of the connecting ring 71, the traveling wheel 728 can be made of gears, while the rear end surface of the connecting ring 71 has a toothed ring, so that the gear-shaped traveling wheel 728 meshes on the toothed ring surface, and while rotating, the slider 726 achieves circumferential motion.

[0085] Specifically, the outer side of the walking wheel 728 is made of rubber and makes interference contact with the rear end surface of the connecting ring 71 to increase friction.

[0086] Specifically, a second motor 729 is fixedly connected to the inner rear end of the slider 726, and a turntable 7210 is fixedly connected to the end of the main shaft of the second motor 729. The detection probe 723 is fixed on the turntable 7210 by a shaft, and the shaft of the detection probe 723 is not located at the center of the turntable 7210.

[0087] In this invention, in order to further increase the detection range, a second motor 729 is also provided. When the second motor 729 rotates, it can drive the turntable 7210 and the detection probe 723 to rotate. Since the axis of the detection probe 723 is not the same as the axis of the second motor 729, when the second motor 729 rotates, the detection probe 723 will rotate eccentrically, thereby increasing the upper and lower range of the detection coverage of the detection probe 723 and realizing ultrasonic detection of the entire grouting position.

[0088] The detection principle of the detection probe 723 is implemented using existing technology, and will not be elaborated further here.

[0089] When the movable end 7121 of the hydraulic rod 712 retracts, the solenoid valve 732 can be opened again to allow the coupling fluid in the compensation gap 734 to flow back.

[0090] Method for detecting grouting quality after shield tunneling in karst formation: During the grouting stage, under pressure, the supporting coupling surface 73 and the pressure-bearing sealing ring 731 serve as sealing surfaces, and the grout will firmly adhere to the flat supporting coupling surface 73, thereby avoiding the presence of air on the coupling surface. Ultrasonic detection is achieved by transmitting ultrasonic waves to the rear end through the detection probe 723, ensuring the effectiveness of ultrasonic detection.

[0091] If cavities or low-density areas are found, the grouting pressure and flow rate should be adjusted promptly.

[0092] Example 2 is a further improvement upon Example 1. Please refer to Example 1. Figures 1-9 An elastic layer 733 is attached to the rear end of the supporting coupling surface 73, and a solenoid valve 732 is fixedly connected to the inner side of the outer edge of the supporting coupling surface 73. After the solenoid valve 732 is opened, the coupling fluid can enter the inner side of the elastic layer 733 to form a compensation gap 734 composed of coupling fluid.

[0093] Because the solidified slurry will shrink slightly, at this time, the solenoid valve 732 is opened to allow the coupling fluid to enter the elastic layer 733 to compensate for the slight shrinkage of the solidified slurry, ensure the coupling effect, ensure the ultrasonic detection effect, and realize ultrasonic detection after the slurry is formed.

[0094] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A system for detecting the grouting quality during shield tunneling, comprising a detection system (7) installed at the tail of the shield machine (5), characterized in that: The detection system (7) includes a connecting ring (71), an annular shell (72), and an annular support coupling surface (73). The front end of the connecting ring (71) is fixedly connected to the connector (711), and the connector (711) is detachably connected to the shield tail by bolt connection. The annular shell (72) is fixedly connected to the rear end of the connecting ring (71), and the rear end of the annular shell (72) is fixedly connected to the supporting coupling surface (73). The inner side of the annular shell (72) is a closed annular cavity (722), which is filled with ultrasonic coupling fluid. The supporting coupling surface (73) is made of non-metallic material. A slider (726) is slidably connected to the rear side of the connecting ring (71), and a detection probe (723) is installed on one side of the slider (726). The detection probe (723) emits ultrasonic waves to the rear end to achieve ultrasonic detection. The inner and outer sides of the support coupling surface (73) are fixedly connected with pressure sealing rings (731). During grouting, under the action of pressure, the support coupling surface (73) and the pressure sealing rings (731) act as sealing surfaces, and the grout will firmly adhere to the flat support coupling surface (73), thereby avoiding the presence of air on the coupling surface and ensuring the effect of ultrasonic testing.

2. The system for detecting the grouting quality during shield tunneling construction according to claim 1, characterized in that: The pressure sealing ring (731) is made of rubber. The cross-section of the pressure sealing ring (731) is triangular. The front end of the pressure sealing ring (731) can be supported. The side of the pressure sealing ring (731) away from the support coupling surface (73) is the outer top surface (7311). The rear end of the pressure sealing ring (731) is the side concave surface (7312). The inner side of the pressure sealing ring (731) is the liquid cavity (7313). Under the action of grouting pressure, the rear end of the pressure sealing ring (731) can compress the concave side (7312), so that the outer top surface (7311) is tightly attached to the outside of the rock and soil (1) or the pipe segment (3) to achieve the sealing effect.

3. The system for detecting the grouting quality during shield tunneling construction according to claim 2, characterized in that: The annular shell (72) is fixedly connected to both the inner and outer sides of the shell. The outer support tube (721) is fixedly connected to the rear end of the outer support tube (721) and the inner support tube (721) is fixedly connected to the rear end of the inner support tube (721). The outer support tube (724) and the inner support tube (725) are respectively supported on the front end of the outer and inner pressure sealing rings (731).

4. The system for detecting the grouting quality during shield tunneling construction according to claim 3, characterized in that: The two ends of the support tube (721) are connected to the inner side of the annular cavity (722) and the inner side of the liquid cavity (7313), respectively. Multiple hydraulic rods (712) are fixedly connected to the inner side of the front end of the connecting ring (71). The movable end (7121) of the hydraulic rod (712) can extend into or out of the annular cavity (722). The amount of liquid in the liquid cavity (7313) can be adjusted by the movement of the movable end (7121), thereby further adjusting the sealing performance.

5. The system for detecting the grouting quality during shield tunneling construction according to any one of claims 1-4, characterized in that: A slide rail (713) is fixedly connected to the rear side of the connecting ring (71), and a slider (726) is slidably connected to the surface of the slide rail (713). A first motor (727) is fixedly connected to the inner side of the slider (726), and a traveling wheel (728) is fixedly connected to the end of the main shaft of the first motor (727). The traveling wheel (728) rotates on the rear surface of the connecting ring (71) to realize the movement of the detection probe (723) in the annular cavity (722) and realize the overall detection of the annular grouting body (2).

6. The system for detecting the grouting quality during shield tunneling construction according to claim 5, characterized in that: The outer side of the walking wheel (728) is made of rubber and has an interference fit with the rear end surface of the connecting ring (71).

7. The system for detecting the grouting quality during shield tunneling construction according to claim 6, characterized in that: The rear inner side of the slider (726) is fixedly connected to a second motor (729), and the end of the main shaft of the second motor (729) is fixedly connected to a turntable (7210). The detection probe (723) is fixed on the turntable (7210) by a shaft, and the shaft of the detection probe (723) is not located at the center of the turntable (7210).

8. The system for detecting the grouting quality during shield tunneling construction according to claim 7, characterized in that: An elastic layer (733) is attached to the rear end of the support coupling surface (73), and a solenoid valve (732) is fixedly connected to the inner side of the outer edge of the support coupling surface (73). When the solenoid valve (732) is opened, the coupling fluid can enter the inner side of the elastic layer (733) to form a compensation gap (734) composed of coupling fluid.

9. A method for detecting the grouting quality after shield tunneling in karst formations, using the grouting quality detection system described in claim 8, characterized in that: During the grouting stage, under pressure, the supporting coupling surface (73) and the pressure-bearing sealing ring (731) serve as sealing surfaces, and the grout will adhere firmly to the flat supporting coupling surface (73), thereby avoiding the presence of air on the coupling surface. Ultrasonic detection is achieved by transmitting ultrasonic waves to the rear end through the detection probe (723), ensuring the effectiveness of ultrasonic detection. If cavities or low-density areas are found, the grouting pressure and flow rate should be adjusted promptly.

10. The method for detecting the grouting quality after shield tunneling in karst formations according to claim 9, characterized in that: After the slurry solidifies, it will slightly shrink. At this time, the solenoid valve (732) is opened to allow the coupling fluid to enter the elastic layer (733) to compensate for the slight shrinkage of the solidified slurry, ensure the coupling effect, and ensure the effect of ultrasonic detection.

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