Real-time detection system and method for slurry and concrete critical plane in underwater pouring

Abstract

The invention discloses a real-time detection system and method for a slurry and concrete critical surface in underwater pouring, and the system comprises a main control unit which is used for collecting, storing and transmitting a signal, a sensing unit which is used for transmitting collected data to the main control unit, and an execution unit which is used for actually detecting the slurry and concrete critical surface. The execution unit comprises a framework serving as a device structure main body, and the framework is provided with a pulley block composed of a plurality of guide pulleys, a lifting device and a gravity probe; a pull rope is wound on the lifting device, bypasses the pulley block and is connected with the gravity probe; and the gravity probe and the pull rope are connected through a tension inertia measurement unit which is in communication connection with the main control unit. When the two gravity probes with the density slightly higher than that of concrete and different bottom areas are adopted to detect the concrete critical surface with the viscosity and the resistance obviously larger than those of slurry, the accurate depth of the concrete critical surface can be effectively determined by comparing the postures of the two gravity probes.

Description

Technical Field

[0001] The present invention relates to the technical field of geological anti-seepage treatment, and particularly to the technical field of measuring the pulling-out depth of a pouring pipe during the pouring of a cut-off wall. Specifically, it relates to a real-time detection system and method for the interface between slurry and concrete in underwater pouring. Background Art

[0002] The main current technologies for detecting the concrete interface of an anti-seepage curtain wall include the traditional sounding rope method, electromagnetic wave / ultrasonic wave detection method, pressure sensor method, fiber optic sensing method, etc. The sounding rope method involves manually lowering a sounding rope with a weight to contact the concrete surface and judging the depth based on the scale. Its advantages are low cost and simple operation, but it is significantly affected by the slurry viscosity, concrete fluidity, and manual operation errors. Especially in deep grooves or complex working conditions, the accuracy and reliability are poor, and frequent operation easily leads to problems such as sounding rope contamination or winding failures, resulting in low efficiency. The electromagnetic wave or ultrasonic wave detection method analyzes the interface position by transmitting signals and receiving reflected waves, having the advantages of non-contact and strong real-time performance. However, obstacles such as suspended particles, bubbles in the slurry, and steel bars in the groove will interfere with signal propagation, leading to data distortion, and the equipment is expensive, the data processing algorithm is complex, and the adaptability to the on-site environment is limited. The pressure sensor method calculates the interface based on the pressure gradient change caused by the density difference between concrete and slurry, and requires pre-burying a sensor array. Although continuous monitoring can be achieved, the sensors are easily damaged by slurry infiltration or concrete impact, with insufficient long-term stability, and the installation and maintenance costs are relatively high. The distributed fiber optic sensing technology developed in recent years locates the interface by monitoring the temperature or strain changes during the concrete pouring process, having the potential for high-precision, anti-interference, and long-distance monitoring. However, the fiber optic layout is complex, easily damaged by construction machinery, and relies on special demodulation equipment, thus limiting its popularization and application. Generally speaking, the existing technologies generally face the trade-off between accuracy and reliability, environmental adaptability, cost, and ease of use. The industry is exploring multi-sensor fusion, intelligent algorithm compensation, and new non-destructive testing means to break through the bottleneck. Based on the above situation, the detection method combining the traditional sounding rope method and sensors is currently the preferred solution that can take into account both cost investment and detection accuracy. Moreover, the detection device can be reused repeatedly with almost no loss. By combining the tension and angle information collected by the sensors, the real-time state of the gravity probe can be judged, objectively reflecting the real result and effectively solving the problem of underwater detection of the concrete interface. Summary of the Invention

[0003] In order to solve the problem that when pouring concrete for the anti-seepage curtain wall, the pouring pipe is always at an ideal buried depth, avoiding the problems that it is not easy to pull out when the buried depth is too large or the concrete is mixed with mud when the buried depth is too small, resulting in anti-seepage failure, the present application provides a real-time detection system and method for the interface between mud and concrete during underwater pouring. Through a newly designed lifting device, in cooperation with a tension inertia measurement unit, it can measure the different states of the gravity probe at different positions in real time. By combining the structure, force condition, and attitude condition of the gravity probe, the position of the current interface between concrete and mud can be accurately judged, so as to accurately grasp the timing and height of pipe pulling. At the same time, the present invention is also applicable to determining the pipe pulling timing of the diaphragm wall joint pipe. By detecting the interface between the initial-set concrete and mud, the pipe pulling height of the joint pipe can be determined, avoiding the problem of concrete leakage caused by excessive pipe pulling of the joint pipe.

[0004] In order to achieve the above object, the technical solution adopted by the present application is as follows: A real-time detection system for the interface between mud and concrete during underwater pouring, including a main control unit for collecting, storing, and sending signals, a sensing unit for sending the collected data to the main control unit, and an execution unit for actually detecting the interface between mud and concrete. The execution unit includes a skeleton as the main body of the device structure. There is a pulley group composed of multiple guide pulleys, a lifting device, and a gravity probe on the skeleton; a pulling rope is wound on the lifting device, and the pulling rope bypasses the pulley group and is connected to the gravity probe; the gravity probe is connected to the pulling rope through a tension inertia measurement unit communicatively connected to the main control unit. The gravity probe includes two independent gravity probes A and B that are alternatively connected to the pulling rope. The gravity probe A is a cylindrical structure with a conical bottom, and the density is 2.8 - 3 g / cm 3 , and the mass is 40 Kg - 60 Kg; the gravity probe B has a bottom surface area of 200 cm 2 - 400 cm 2 , the density is 3 g / cm 3 , and the weight is 80 Kg - 100 Kg.

[0005] Preferably, the lifting device includes a frame fixedly installed on the skeleton. A wire winding wheel for taking in and paying out the pulling rope, a wire guiding mechanism for adjusting the position relationship between the pulling rope and the wire winding wheel in real time, and a transmission mechanism for driving the wire winding wheel and the wire guiding mechanism are installed on the frame.

[0006] As an optional preferred driving structure, one end of the wire winding wheel is coaxially and fixedly connected with a third sprocket. The transmission mechanism includes a servo motor, a speed reducer and commutator, and a first sprocket that are sequentially drivingly connected. The first sprocket is drivingly connected to the third sprocket through a first chain.

[0007] As an optional preferred driving structure of the wire mechanism, the wire mechanism includes a slide rail and a wire track that are arranged in parallel on the frame. The end of the wire track is connected with a second sprocket, and the second sprocket is drivingly connected with a fourth sprocket coaxially arranged outside the third sprocket through a second chain.

[0008] In order to achieve accurate wire guiding so that the pull rope can be accurately wound around the wire reel along the wire track, preferably, the wire mechanism further includes a sliding seat slidably arranged on the slide rail, a frame drivingly connected with the wire track, a guide wheel installed in the frame for adjusting the relative position between the pull rope and the wire reel, and a pair of wire clamping wheels for clamping the pull rope are installed on the frame through an adjustable bracket.

[0009] In order to avoid the pull rope jumping the line during the retraction and extension process, which affects the accuracy of depth measurement, preferably, the lifting device further includes a wire pressing mechanism for placing the pull rope to jump the line. The wire pressing mechanism includes a support shaft arranged in parallel with the wire reel, two rocker arms fixedly or rotatably arranged on the support shaft, a wire pressing roller is rotatably installed between the upper ends of the two rocker arms, and the other end of any one rocker arm is connected with an adjusting seat fixedly arranged on the skeleton or the frame through a tension spring and always drives the wire pressing roller to apply pressure to the wire reel through the rocker arm.

[0010] The present invention also provides a detection method for real-time detecting the position of the interface between the mud and the concrete during the underwater pouring process, which is completed based on the above detection system, and specifically includes the following detection steps: Step STP100, the device is in place. Move the detection system to the position of the tank to be detected, and ensure that the gravity probe is near the center position of the tank. Initialize and check whether the current weight and attitude of the gravity probe displayed on the main control unit are consistent with the actually hoisted gravity probe, and complete the inspection before detection; Step STP200, lowering for detection. Select the gravity probe B and control the lowering of the gravity probe B through the lifting device until the lower surface of the gravity probe B just contacts the mud surface in the tank, and then initialize the depth value of the lifting device to zero; start lowering at a uniform speed of 0.1 m / s, and record the pulling force F, the depth H, and the inclination angle β of the gravity probe B, and respectively execute the following steps according to the changes of the pulling force F and the inclination angle β: When the change value ΔF of the pulling force F ≥ 10 N, mark the current depth H1 and execute step STP300; When the change value Δβ of the inclination angle β ≥ 2°, mark the current depth H2 and execute step STP400; Step STP300, Tensile Force F Calibration Detection: The lifting device stops lowering the gravity probe B, and slowly lifts the gravity probe B upward by 1 - 2 m. Then, lower the gravity probe B at a speed of 5 cm / s, and record the tensile force F, depth H, and the inclination angle β of the gravity probe B in real time. When reaching the depth H1 again, if the change value ΔF of the tensile force F ≥ 10 N, execute Step STP500; otherwise, return to Step STP200; Step STP400, Inclination Angle β Calibration Detection: The lifting device stops lowering the gravity probe B, and slowly lifts the gravity probe B upward by 1 - 2 m. Then, lower the gravity probe B at a speed of 5 cm / s, and record the tensile force F, depth H, and the inclination angle β of the gravity probe B in real time. When reaching the depth H2 again, if the change value Δβ of the inclination angle β ≥ 2°, execute Step STP500; otherwise, return to Step STP200; Step STP500, Interface Detection: Reduce the descending speed of the lifting device to 1 cm / s until the tensile force F = 0 N, and mark the depth H3 when the tensile force F = 0 N; Step STP600, Replace the Gravity Probe: The lifting device evenly pulls up the gravity probe B at a speed of 0.5 m / s to the surface of the tank, replace the gravity probe A, and repeat Steps STP100 - STP500; Mark the depth H4 when the tensile force F = 0 N and the depth H4 when the change value Δβ of the inclination angle β is the largest respectively; Step STP700, Calculate the Critical Interface Depth Value: Calculate the average value H of the depth H3 and the depth H4 平均 , and the final depth H 终 The value is: where L is the length of the gravity probe A.

[0011] Beneficial Effects: 1. When the present invention uses two gravity probes with densities slightly higher than that of concrete and different bottom areas to detect the concrete critical interface with significantly greater viscosity and resistance than mud, the precise depth of the concrete critical interface can be effectively determined by comparing the postures of the two gravity probes.

[0012] 2. The present invention can orderly wind and unwind the pull rope through the wire mechanism, solving the problems of discontinuous detection data and data distortion caused by the force jumper due to the overlap of the pull rope; at the same time, by further adding a wire pressing mechanism, the problem of the pull rope jumper on the wire reel can be further solved.

[0013] 3. The present invention can record the trend of the tensile force F exerted on the pulling rope throughout the process. By analyzing the relationship between the tensile force F and the depth H, as well as the inclination angle β of the gravity probe, it can determine whether the gravity probe reaches the true interface of the setting retarder concrete, avoiding misjudgment caused by the abnormal contact of the gravity probe with the side wall of the tank or the sediment in the stepped hole, resulting in a decrease in the tensile force. Description of the Drawings

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those skilled in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0015] Figure 1 It is an isometric view of the structure of the present invention.

[0016] Figure 2 It is Figure 1 Another isometric view of the visual structure.

[0017] Figure 3 It is Figure 2 An enlarged view of the structure in area A in

[0018] Figure 4 It is Figure 1 The front view of

[0019] Figure 5 It is an isometric view of the lifting device structure.

[0020] Figure 6 It is Figure 5 Another visual isometric view with some frames hidden.

[0021] Figure 7 It is a schematic diagram of the actual detection by the gravity probe B.

[0022] Figure 8 It is a schematic diagram of the actual detection by the gravity probe A.

[0023] Figure 9 It is a curve showing the changes in the tensile force, inclination angle, and depth of the gravity probe in different strata.

[0024] Figure 10 It is Figure 9 An enlarged view within the circle in and a curve graph showing the change in the tensile force with the gravity probe B as an example.

[0025] Figure 11 It is Figure 9 An enlarged view within the circle in and a curve graph showing the change in the tensile force with the gravity probe A as an example.

[0026] In the figure: 1 - Skeleton; 2 - Guide pulley; 3 - Pulling rope; 4 - Gravity probe; 5 - Lifting device; 50 - Frame; 51 - Wire mechanism; 511 - Wire rail; 512 - Bracket housing; 513 - Guide wheel; 514 - Slide seat; 515 - Adjustable bracket; 516 - Wire clamping wheel; 517 - Slide rail; 52 - Wire reel; 521 - Third sprocket; 522 - Fourth sprocket; 53 - Transmission mechanism; 531 - Servo motor; 532 - Reduction and reversing gear; 533 - First sprocket; 534 - First chain; 535 - First tensioning sprocket; 536 - Second tensioning sprocket; 537 - Second chain; 538 - Second sprocket; 54 - Wire pressing mechanism; 541 - Wire pressing roller; 542 - Rocker arm; 543 - Support shaft; 544 - Tension spring; 545 - Adjusting seat. Detailed implementation manners

[0027] To make the objectives, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some but not all of the embodiments of the present application. Usually, the components of the embodiments of the present application described and illustrated in the accompanying drawings here can be arranged and designed in various different configurations.

[0028] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application claimed, but merely represents selected embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present application without creative efforts fall within the scope of protection of the present application.

[0029] It should be noted that: Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0030] In the description of the present application, it should be noted that if terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are used to indicate the orientation or positional relationship, it is based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship in which the product of this application is usually placed during use. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be construed as a limitation to the present application. In addition, in the description of the present application, if terms such as "first", "second", etc. are used only for distinguishing descriptions, they cannot be understood as indicating or implying relative importance.

[0031] In addition, in the description of the present application, if terms such as "horizontal" and "vertical" appear, it does not mean that the components are required to be absolutely horizontal or hanging vertically, but they can be slightly inclined. For example, "horizontal" only means that its direction is more horizontal relative to "vertical", and it does not mean that the structure must be completely horizontal, but it can be slightly inclined.

[0032] In the description of the present application, it should also be noted that unless otherwise clearly specified and limited, if terms such as "set", "installed", "connected", and "connected" appear, they should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific situations.

[0033] Example 1: This embodiment provides a real-time detection system for the interface between slurry and concrete during underwater pouring, including a main control unit for collecting, storing, and sending signals, a sensing unit for sending the collected data to the main control unit, and an execution unit for actually detecting the interface between slurry and concrete. The execution unit is as Figures 1-6 shown, and specifically includes a skeleton 1 as the main body of the device structure. There is a pulley group composed of a plurality of guide pulleys 2 on the skeleton 1, a lifting device 5, and a gravity probe 4. A pulling rope 3 is wound around the lifting device 5, and the pulling rope 3 bypasses the pulley group and is connected to the gravity probe 4. The gravity probe 4 is connected to the pulling rope 3 through a tension inertia measurement unit communicatively connected to the main control unit. The gravity probe 4 includes two independent gravity probes A and B that are alternatively connected to the pulling rope 3. The gravity probe A is a cylindrical structure with a conical bottom, with a density of 2.8 g - 3 g / cm 3 , and a mass of 40 Kg - 60 Kg; the gravity probe B has a bottom surface area of 200 cm 2 - 400 cm 2 , a density of 3 g / cm 3 , and a weight of 80 Kg - 100 Kg.

[0034] Working principle: As shown in Figure 1 , the lifting device 5 controls the lifting of the gravity probe 4 fixedly connected to the free end of the pulling rope by taking in and paying out the pulling rope 3. Since the tension inertia measurement unit is connected between the gravity probe 4 and the pulling rope 3, as long as the resultant force acting on the gravity probe 4 remains unchanged, the tension F collected by the tension inertia measurement unit will not change. Since the gravity probe 4 is in the air before entering the tank, at this time, the resultant force F 合1 = gravity FG ; When the gravity probe 4 enters the tank, the first thing it contacts is the bentonite slurry. At this time, it is affected by the buoyancy of the bentonite slurry. According to different motion states, the resultant external force F it receives 合2 = gravitational force F G - buoyancy F 浮 + f 摩 ; Among them, the buoyancy F 浮 = ρgV, where ρ represents the density of the current fluid medium, g represents the acceleration due to gravity, V represents the volume immersed in the fluid, and f 摩 represents the frictional resistance received by the gravity probe 4 when rising / falling. It should be noted that when rising, the direction of the frictional resistance is downward, so the frictional resistance f 摩 is positive; on the contrary, when descending, the direction of the frictional resistance is upward, so the frictional resistance f 摩 is negative; when stationary, the frictional resistance f 摩 is 0. The gravity probe 4 successively passes through the bentonite slurry, the bentonite slurry and mud mixture, the concrete and mud mixture as shown in Figure 7 and Figure 8 , and then enters the concrete. Due to the different densities of different fluid media, in the above order, the density of the fluid medium decreases step by step, which are 1.05 g / cm 3 , 1.6 g / cm 3 , 2.0 g / cm 3 , and 2.4 g / cm 3 , respectively. Even if the mud ratios used in different projects are different, the density difference is usually controlled within the range of ±0.1 g / cm 3 . Therefore, it will not affect the trend of the change curve of the tensile force F received by the gravity probe 4. According to the change of the tensile force F with the sinking depth, see the appendix Figures 7-8 shown. At the same time, by replacing different gravity probes, the attitude is further collected. In this way, the data of the two gravity probes can be compared to accurately know the depth position of the current concrete interface. Compared with the traditional sounding rope method, this embodiment has higher measurement accuracy, faster efficiency, and the data can be stored for subsequent analysis. In this embodiment, the tensile force inertial measurement unit is composed of a tensile force sensor and an inertial measurement sensor IMU, and is used to collect the tensile force and angle in real time.

[0035] Embodiment 2: On the basis of the above Embodiment 1, this embodiment further optimizes the structure design. Specifically, the lifting device 5 includes a frame 50 fixedly installed on the skeleton 1, a wire reel 52 installed on the frame 50 for winding and unwinding the pulling rope 3, a wire guiding mechanism 51 for adjusting the position relationship between the pulling rope 3 and the wire reel 52 in real time, and a transmission mechanism 53 for driving the wire reel 52 and the wire guiding mechanism 51.

[0036] As an optional preferred driving structure, refer to Figures 2-3 As shown, in this embodiment, one end of the wire winding wheel 52 is coaxially and fixedly connected with a third sprocket 521. The transmission mechanism 53 includes a servo motor 531, a speed reducer and commutator 532, and a first sprocket 533 which are sequentially drivingly connected. The first sprocket 533 is drivingly connected with the third sprocket 521 through a first chain 534.

[0037] As an optional preferred driving structure of the wire guiding mechanism, refer to Figure 5 As shown, the wire guiding mechanism 51 includes a slide rail 517 and a wire guiding rail 511 which are arranged in parallel on the frame 50. The end of the wire guiding rail 511 is connected with a second sprocket 538. The second sprocket 538 is drivingly connected with a fourth sprocket 522 which is coaxially arranged outside the third sprocket 521 through a second chain 537. The arrangement of the wire guiding mechanism 51 can enable the pull rope 3 to reciprocally wind on the effective wire winding width of the entire wire winding wheel 52 evenly, and the problem of uneven wire winding will not occur, thereby effectively avoiding the problem of jumper wire and resulting in low depth measurement accuracy.

[0038] In order to achieve accurate wire guiding so that the pull rope 3 can be accurately wound on the wire winding wheel 52 according to the wire guiding rail 511, in this embodiment, the wire guiding mechanism 51 further includes a slide block 514 slidably arranged on the slide rail 517, a frame 50 drivingly connected with the wire guiding rail 511. A guide wheel 513 for adjusting the relative position between the pull rope 3 and the wire winding wheel 52 is installed in the frame 50. A pair of wire clamping wheels 516 for clamping the pull rope 3 are also installed on the frame 50 through an adjustable support 515. The installation method of the wire clamping wheels 516 is as Figure 5 As shown, the wire clamping wheels 516 have two functions. One is to fix the pull rope 3 so that it can be stably accommodated in the groove of the guide wheel 513 regardless of the size of the wire winding and unwinding speed, playing a stabilizing role, and at the same time can effectively improve the wire winding quality of the wire winding wheel 52 to achieve layer-by-layer wire winding. The other is to be able to assist in installing a measurement unit to measure the length of the pull rope 3 through the number of rotations of the wire clamping wheels 516, avoiding the problem of inaccurate measurement caused by slipping between the guide wheel 513 or the guiding pulley 2 and the pull rope 3.

[0039] In order to avoid the problem of jumper wire during the winding and unwinding of the pull rope 3, which affects the accuracy of depth measurement, further optimize the structure, refer to the attached Figure 6As shown, the lifting device 5 further includes a wire pressing mechanism 54 for placing the jumper of the pulling rope 3. The wire pressing mechanism 54 includes a support shaft 543 arranged in parallel with the wire winding wheel 52, two rocker arms 542 fixedly or rotatably arranged on the support shaft 543, a wire pressing roller 541 rotatably installed between the upper ends of the two rocker arms 542, and the other end of any one of the rocker arms 542 is connected to an adjustment seat 545 fixedly arranged on the skeleton 1 or the frame 50 through a tension spring 544 and always drives the wire pressing roller 541 to apply pressure to the wire winding wheel 52 through the rocker arm 542. As Figure 6 shown, the lower ends of the two rocker arms 542 symmetrically arranged on the support shaft 543 press the wire pressing roller 541 tightly on the wire winding wheel 52 through the tension spring 544 that is always in a stretched state, thereby preventing the pulling rope wound on the wire winding wheel 52 from suddenly jumping during the process of winding / unwinding the wire, resulting in a large short-term fluctuation of the pulling force F and affecting the pulling force curve, thus affecting the accuracy of parameter analysis.

[0040] Embodiment 3: The present invention provides a detection method for real-time detecting the position of the interface between slurry and concrete during underwater pouring, which is completed based on the detection system shown in any of the above embodiments. For the structure of the detection system, refer to Figures 1-6 , and at the same time, in combination with Figures 7-11 the detection curve shown to determine the depth position of the current concrete interface. The specific detection steps are as follows: Step STP100, the device is in place. Move the detection system to the position of the tank to be detected, and ensure that the gravity probe 4 is near the center position of the tank. Initialize and check whether the current weight and attitude of the gravity probe 4 displayed on the main control unit are consistent with the actually hoisted gravity probe 4 to complete the inspection before detection; Step STP200, lower for detection. Select the gravity probe B and control the lowering of the gravity probe B through the lifting device 5 until the lower surface of the gravity probe B just contacts the slurry surface in the tank, and then initialize and zero the depth value of the lifting device 5; start lowering at a uniform speed of 0.1 m / s, and record the pulling force F, the depth H, and the inclination angle β of the gravity probe B. And respectively execute the following steps according to the changes of the pulling force F and the inclination angle β: When the change value ΔF of the pulling force F ≥ 10 N, mark the current depth H1 and execute step STP300; When the change value Δβ of the inclination angle β ≥ 2°, mark the current depth H2 and execute step STP400; Step STP300, Tensile Force F Calibration Detection: The lifting device 5 stops lowering the gravity probe B, and slowly lifts the gravity probe B upward by 1 - 2 m. Then, lower the gravity probe B at a speed of 5 cm / s, and record the tensile force F, depth H, and the inclination angle β of the gravity probe B in real time. When reaching the depth H1 again, if the change value ΔF of the tensile force F ≥ 10 N, then execute Step STP500; otherwise, return to Step STP200. Step STP400, Inclination Angle β Calibration Detection: The lifting device 5 stops lowering the gravity probe B, and slowly lifts the gravity probe B upward by 1 - 2 m. Then, lower the gravity probe B at a speed of 5 cm / s, and record the tensile force F, depth H, and the inclination angle β of the gravity probe B in real time. When reaching the depth H2 again, if the change value Δβ of the inclination angle β ≥ 2°, then execute Step STP500; otherwise, return to Step STP200. Step STP500, Interface Detection: Reduce the descending speed of the lifting device 5 to 1 cm / s until the tensile force F = 0 N, and mark the depth H3 when the tensile force F = 0 N. Step STP600, Replace the Gravity Probe: The lifting device 5 pulls the gravity probe B upward at a constant speed of 0.5 m / s to the surface of the tank, replace the gravity probe A, and repeat Step STP100 - Step STP500; mark the depth H4 when the tensile force F = 0 N and the depth H4 when the change value Δβ of the inclination angle β is the largest respectively. Step STP700, Calculate the Critical Interface Depth Value: Calculate the average value H of the depth H3 and the depth H4 平均 , and the final depth H 终 The value is: where L is the length of the gravity probe A.

[0041] It should be noted that due to the influence of the slump of concrete poured under the mud, in the case of using the gravity probe A with a longer length, since the length of the gravity probe A is relatively large and the density is slightly greater than that of the concrete, the gravity probe A will tilt. As a result, the change difference Δβ of the inclination angle β may exceed 90°, that is, it is equivalent to the gravity probe A stopping falling after the lower end touches the concrete layer. However, due to its own density being slightly higher than that of the concrete and higher than the density of the mud - concrete mixture, the gravity probe A will fall down, and even the upper end may be lower than the lower end, which makes the value of Δβ exceed 90°. Of course, if in an extreme case, there is no change in Δβ, the pull rope 3 can be pulled several times until Δβ changes, so as to accurately determine the exact position of the concrete critical interface.

[0042] When confirming the concrete critical interface, it is necessary to analyze from the change curve between the tensile force F and the depth H. SeeFigure 7 As shown, since Figure 7 the gravity probe B is adopted, which has a relatively large bottom area and a relatively low height. Therefore, when crossing fluids with different densities, the pulling force will show a gradually decreasing trend. When the gravity probe B is completely immersed in the fluid with a relatively large density, the pulling force F will show a stable state again; until the gravity probe B is completely stationary on the concrete, the pulling force F is 0, and its curve is as Figure 10 shown; the points G, H, I, J, K, and L in the figure are all the nodes where the pulling force F changes; the point Q is the node where the pulling force F decreases to 0. When the gravity probe B passes through positions B, C, D, and E in sequence, the buoyancy force received will increase gradually, and the curve trend of the pulling force F is as Figure 10 shown. The curve trend can analyze the distribution of the fluid medium in the tank, so as to predict the mixing situation of the fluid medium at different depths in the tank. In addition to being used to solve the problem of determining the concrete interface in the present invention, it can also be used to analyze the water gushing, collapse, etc. under the tank; it lays a foundation for water conservancy infrastructure construction and subsequent big data analysis.

[0043] Similarly, the principle of the force-receiving situation of the gravity probe A is the same as that of the gravity probe B. However, since the length of the gravity probe A is relatively long and may exceed the depth of the same fluid medium, before the gravity probe A is completely separated from the first fluid, it enters the third fluid medium, which makes the change of the pulling force F not have a stage of tending to be stable. Every time it moves down a certain distance, the buoyancy force received will be greater, and then the pulling force F will gradually decrease, and the decreasing trend only depends on the density difference between different fluids. The greater the fluid density, the more obvious the decrease in the pulling force F; the smaller the fluid density, the less significant the decrease in the pulling force F. For details, see Figure 11 shown. The points M, N, O, and P in the figure are the nodes where the pulling force F changes, and the point Q is the node where the pulling force F decreases to 0. The accurate position of the final reliable and accurate concrete interface is obtained through the analysis of the collected curve.

[0044] The above are only the preferred embodiments of the present application and are not used to limit the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. Real-time detection system for the interface between slurry and concrete during underwater pouring, comprising a main control unit for collecting, storing and sending signals, a sensing unit for sending the collected data to the main control unit, and an execution unit for actually detecting the interface between slurry and concrete, characterized in that: The execution unit includes a framework (1) which is the main body of the device structure. A pulley block composed of a plurality of guide pulleys (2), a lifting device (5) and a gravity probe (4) are provided on the framework (1); a pulling rope (3) is wound around the lifting device (5), and the pulling rope (3) bypasses the pulley block and is connected to the gravity probe (4); a tension inertial measurement unit communicating with the main control unit is connected between the gravity probe (4) and the pulling rope (3). The gravity probe (4) includes two independent gravity probes A and B which are alternatively connected to the pulling rope (3). The gravity probe A is a cylindrical structure with a conical bottom, and the density is 2.8 - 3 g / cm 3 , and the mass is 40 Kg - 60 Kg; the gravity probe B has a bottom surface area of 200 cm 2 - 400 cm 2 , the density is 3 g / cm 3 , and the weight is 80 Kg - 100 Kg.

2. The real-time detection system for the interface between slurry and concrete in underwater pouring according to claim 1, characterized in that: The lifting device (5) includes a frame (50) fixedly installed on the skeleton (1). A wire reel (52) for winding and unwinding the pulling rope (3), a wire guiding mechanism (51) for adjusting the positional relationship between the pulling rope (3) and the wire reel (52) in real time, and a transmission mechanism (53) for driving the wire reel (52) and the wire guiding mechanism (51) are installed on the frame (50).

3. The real-time detection system for the interface between slurry and concrete during underwater pouring according to claim 2, wherein: One end of the wire reel (52) is coaxially and fixedly connected with a third sprocket (521). The transmission mechanism (53) includes a servo motor (531), a speed reducer and commutator (532), and a first sprocket (533) which are sequentially drivingly connected. The first sprocket (533) is drivingly connected with the third sprocket (521) through a first chain (534).

4. The real-time detection system for the interface between slurry and concrete during underwater pouring according to claim 3, wherein: The wire guiding mechanism (51) includes a slide rail (517) and a wire guiding rail (511) arranged in parallel on the frame (50). A second sprocket (538) is connected to the end of the wire guiding rail (511). The second sprocket (538) is drivingly connected with a fourth sprocket (522) coaxially arranged outside the third sprocket (521) through a second chain (537).

5. The real-time detection system for the interface between slurry and concrete during underwater pouring according to claim 4, wherein: The wire guiding mechanism (51) further includes a slide seat (514) slidably arranged on the slide rail (517), a frame (50) drivingly connected with the wire guiding rail (511). A guide pulley (513) for adjusting the relative position between the pulling rope (3) and the wire reel (52) is installed in the frame (50). A pair of wire clamping pulleys (516) for clamping the pulling rope (3) are also installed on the frame (50) through adjustable brackets (515).

6. The real-time detection system for the interface between slurry and concrete during underwater pouring according to claim 2, wherein: The lifting device (5) further includes a wire pressing mechanism (54) for preventing the pulling rope (3) from jumping. The wire pressing mechanism (54) includes a support shaft (543) arranged in parallel with the wire reel (52), two rocker arms (542) fixedly or rotatably arranged on the support shaft (543). A wire pressing roller (541) is rotatably installed between the upper ends of the two rocker arms (542). The other end of any one of the rocker arms (542) is connected to an adjusting seat (545) fixedly arranged on the skeleton (1) or the frame (50) through a tension spring (544), and always drives the wire pressing roller (541) to apply pressure to the wire reel (52) through the rocker arm (542).

7. A detection method for real-time detecting the position of the interface between slurry and concrete during underwater pouring, characterized in that, Based on the detection system described in any one of claims 1-6, it is completed, and specifically includes the following detection steps: Step STP100, the device is in place. Move the detection system to the position of the tank to be detected, and ensure that the gravity probe (4) is near the center position of the tank. Initialize and check whether the current weight and attitude of the gravity probe (4) displayed on the main control unit are consistent with the actually hoisted gravity probe (4) to complete the inspection before detection; Step STP200, lowering detection. Select the gravity probe B and control the lowering of the gravity probe B through the lifting device (5) until the lower surface of the gravity probe B just contacts the mud surface in the tank, and then initialize and zero the depth value of the lifting device (5); start lowering at a constant speed of 0.1 m / s, and record the pulling force F, the depth H, and the inclination angle β of the gravity probe B, and respectively execute the following steps according to the changes of the pulling force F and the inclination angle β: When the change value ΔF of the pulling force F ≥ 10 N, mark the current depth H1 and execute Step STP300; When the change value Δβ of the inclination angle β ≥ 2°, mark the current depth H2 and execute Step STP400; Step STP300, pulling force F verification detection. The lifting device (5) stops lowering the gravity probe B, slowly lifts the gravity probe B upward by 1 - 2 m, and then lowers the gravity probe B at a speed of 5 cm / s, and record the pulling force F, the depth H, and the inclination angle β of the gravity probe B in real time; when reaching the depth H1 again, if the change value ΔF of the pulling force F ≥ 10 N, then execute Step STP500, otherwise, return to Step STP200; Step STP400, inclination angle β verification detection. The lifting device (5) stops lowering the gravity probe B, slowly lifts the gravity probe B upward by 1 - 2 m, and then lowers the gravity probe B at a speed of 5 cm / s, and record the pulling force F, the depth H, and the inclination angle β of the gravity probe B in real time; when reaching the depth H2 again, if the change value Δβ of the inclination angle β ≥ 2°, then execute Step STP500, otherwise, return to Step STP200; Step STP500, interface detection. Reduce the lowering speed of the lifting device (5) to 1 cm / s until the pulling force F = 0 N, and mark the depth H3 when the pulling force F = 0 N; Step STP600, replace the gravity probe. The lifting device (5) pulls the gravity probe B upward at a constant speed of 0.5 m / s to the surface of the tank, replace the gravity probe A, and repeat Steps STP100 - STP500; respectively mark the depth H4 when the pulling force F = 0 N and the depth H4 when the change value Δβ of the inclination angle β is the largest; Step STP700, Calculation of the critical interface depth value, calculate the average value H of depth H3 and depth H4 平均 , the final depth H 终 The value is: Wherein, L is the length of the gravity probe A.

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