Real-time monitoring device for underwater concrete pouring liquid level of cast-in-situ bored pile

Abstract

A cast-in-situ bored pile underwater concrete pouring liquid level real-time monitoring device comprises a base and a pulley block, a supporting frame is vertically and fixedly installed in the middle of the base, a pull rope displacement sensor and a guide pulley are installed at the upper end of the supporting frame, and the pulley block comprises a multi-groove movable pulley and a multi-groove fixed pulley. The multi-groove movable pulley is located over the multi-groove fixed pulley, a sensor pull rope and a balance weight lifting rope of the pull rope displacement sensor are both connected with an installation frame of the multi-groove movable pulley, one end of the balance weight lifting rope is connected with the installation frame of the multi-groove movable pulley, and the other end of the balance weight lifting rope is connected with a balance weight block after bypassing the guide pulley. The lower end of the supporting frame or the base is fixedly connected with a telescopic arm, a guide wheel is installed on the telescopic arm, the two sides of the front end of the telescopic arm are connected with telescopic rods used for supporting the steel casing in a limiting mode, a floating lifting rope is wound on the multi-groove movable pulley and the multi-groove fixed pulley in a multi-return-stroke mode, and the upper end of the floating lifting rope is fixedly connected with the multi-groove movable pulley. And the lower end of the buoy lifting rope bypasses the guide wheel and then is vertically connected with a buoy.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of bored pile construction, and particularly relates to a real-time monitoring device for underwater concrete pouring of a bored pile. BACKGROUND

[0002] With the vigorous development of infrastructure construction in China, more and more high-rise buildings, large bridges and highways are being built, and bored piles are an important part of foundation construction in these engineering constructions, and the construction standards are becoming higher and higher. In the pouring process of the bored pile, accurate control of the pouring elevation is crucial. Insufficient concrete pouring height will affect the quality of the bored pile, and excessive concrete pouring height will waste materials and increase construction costs.

[0003] The traditional bored pile pouring elevation monitoring method mainly relies on manual measurement, which has many drawbacks. On the one hand, the accuracy of manual measurement is limited and easily affected by human factors such as the experience and technical level of the measurement personnel, resulting in inaccurate measurement results. Moreover, in complex construction site environments, the safety of the measurement personnel is difficult to fully guarantee. On the other hand, manual measurement is inefficient and cannot achieve real-time monitoring, making it difficult to discover problems in the pouring process in a timely manner and make adjustments. Therefore, some units have developed and applied underwater concrete elevation measurement technology, for example, Chinese patent: A device and method for underwater concrete elevation measurement, application number: 202110585905.X, application date: May 27, 2021, abstract: The utility model discloses a device and method for underwater concrete elevation measurement, comprising a first hollow steel pipe, the shape of the bottom end outer wall of the first hollow steel pipe is set as a tapered shape, the top end outer wall of the first hollow steel pipe is threaded with a connecting ring, the inner wall of the connecting ring is threaded with an extension hollow steel pipe, the outer walls of the extension hollow steel pipe and the first hollow steel pipe are respectively provided with a first monitoring air bag and a second monitoring air bag, a blind pipe is arranged between the first monitoring air bag and the second monitoring air bag, and a connecting mechanism is arranged on the inner wall of the connecting ring. When measuring the underwater concrete elevation, the utility model places the entire device at the bottom of the hole through the stabilizing mechanism, measures the height from the hole bottom to the water surface as H, then stands still for a period of time, and when the pressure in the first monitoring air bag and the second monitoring air bag stabilizes, the pressure detection mechanism detects the pressure in the first monitoring air bag.

[0004] The application research shows that if the above-mentioned technology for measuring the elevation of underwater concrete wants to accurately measure the elevation of concrete, multiple sensors need to be arranged, which not only greatly increases the construction cost, but also makes the installation and debugging process extremely complex and tedious; when the bored pile depth is large, the device is difficult to pull out of the concrete, increasing the construction risk and cost; the device cannot realize real-time and continuous monitoring of the underwater concrete elevation and cannot provide intelligent prompt warning. SUMMARY

[0005] The utility model aims at the problems existing in prior art, provides a kind of bored pile underwater concrete pouring liquid level real-time monitoring device, the device can monitor the elevation of bored pile underwater concrete in real time.

[0006] The utility model is implemented by the following technical solutions:

[0007] A kind of bored pile underwater concrete pouring liquid level real-time monitoring device, it includes for base and pulley group, the middle part position of base is vertically installed with telescopic arm, the other end of telescopic arm is connected with telescopic rod by universal ball, the other end of telescopic rod is connected with adjusting limiting mechanism by universal ball, adjusting limiting mechanism is clamped on steel casing, the middle part position of base is vertically fixed and is installed with support frame, the upper end of support frame is installed with pull rope displacement sensor and guide pulley, pulley group includes multi-groove movable pulley and multi-groove fixed pulley, the mounting bracket of multi-groove fixed pulley is fixedly installed at the lower end of support frame, multi-groove movable pulley is located directly above multi-groove fixed pulley, the sensor pull rope of pull rope displacement sensor is connected with the mounting bracket of multi-groove movable pulley, the mounting bracket of multi-groove movable pulley is also connected with counterweight lifting rope, one end of counterweight lifting rope is connected with the mounting bracket of multi-groove movable pulley, the other end of counterweight lifting rope is connected with counterweight after being wound around guide pulley, the lower end of support frame or base is fixedly connected with telescopic arm, guide wheel is installed on telescopic arm, telescopic rod for limiting support with steel casing is connected on the both sides of the front end of telescopic arm, one float lifting rope is wound on multi-groove movable pulley and multi-groove fixed pulley, the upper end of float lifting rope is fixedly connected with multi-groove movable pulley, the lower end of float lifting rope is connected with float after being wound around guide wheel through telescopic arm.

[0008] Further preferably: the support frame includes four vertical rods, which are fixed on the base in parallel and perpendicular to each other, and are fixedly connected by a fixed rod into a frame-shaped structure, a canopy is installed on the top of the four vertical rods, a load-bearing plate is fixedly connected to the upper end between the four vertical rods, and the pull rope displacement sensor and the guide pulley are fixed on the load-bearing plate by bolts.

[0009] Further preferably, the telescopic arm is composed of a plurality of telescopic arm segments connected in sequence by locking connection of connecting bolts, and the guide wheels are installed at the connecting positions of the telescopic arm segments. The connecting angle of the telescopic arm segments can be adjusted by loosening the connecting bolts, and the adjacent two telescopic arm segments can be fixed by locking the connecting bolts, so as to conveniently adjust the telescopic arm to a suitable angle and smoothly guide and deliver the buoy hoisting rope.

[0010] Further preferably, the telescopic rod adopts a telescopic locking structure of a large pipe surrounding a small pipe, the locking structure is arranged on the pipe body, and can adopt an umbrella handle locking structure, or the telescopic rod adopts a threaded connection structure of a large pipe surrounding a small pipe, the small pipe is provided with external threads, and the large pipe is provided with internal threads; one end of the telescopic rod is connected with the telescopic arm through a universal joint, and the other end of the telescopic rod is connected with an adjusting and limiting mechanism for buckling on the wall of the steel casing through a universal joint, the adjusting and limiting mechanism comprises an inverted U-shaped frame, screw holes are arranged on the side edges of the inverted U-shaped frame, locking bolts are installed in the screw holes, and the end portions of the locking bolts are connected with clamping plates for abutting against the steel casing.

[0011] Further preferably, the bottom of the base is provided with traveling wheels, the support frame can be pushed to travel when not in use; when the device reaches the specified position, the traveling wheels can be braked to ensure that the device is fixed at the specified position.

[0012] Further preferably, the support frame is provided with an industrial personal computer, the industrial personal computer is provided with a loudspeaker, the loudspeaker can broadcast intelligent early warning information, the industrial personal computer is matched and connected with the pull rope displacement sensor signal, the industrial personal computer is provided with a wireless transmission module, and the wireless transmission module transmits the real-time data measured by the pull rope displacement sensor to the cloud space. After the construction is completed, the counterweight, the buoy, the pulley block, the pull rope displacement sensor, the guide pulley, the industrial personal computer, the telescopic arm, the telescopic rod, the adjusting and limiting mechanism, and the support frame are sequentially removed; and the removed parts are transported to the next construction site for use or are transported back to the material turnover warehouse for maintenance and storage.

[0013] The floating body of the device can rise with the rising of the underwater concrete, and the elevation of the cast-in-place pile during pouring can be detected in real time; the lower end of the buoy hoisting rope is connected with the floating body after being wound around the telescopic arm, the lower end or the outer end of the support frame is fixed with the telescopic arm, the telescopic arm is provided with guide wheels, and the front end of the telescopic arm is connected with the telescopic rod for limiting and supporting the steel casing; the telescopic arm and the telescopic rod can position the buoy hoisting rope and the floating body in the steel casing, and do not affect the pouring work of the cast-in-place pile. Compared with the traditional manual measurement of the elevation of the underwater concrete, the device has the advantages of reduced labor cost, time saving, labor saving, safety, accurate measurement data, standardization, easy turnover, reduced construction cost, and no pollution. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is the stereogram structure schematic view of the real-time monitoring device for the underwater concrete pouring liquid level of the cast-in-situ bored pile.

[0015] Figure 2 It is the plane structure schematic view of the real-time monitoring device for the underwater concrete pouring liquid level of the cast-in-situ bored pile.

[0016] Figure 3 It is the left view schematic view of the real-time monitoring device for the underwater concrete pouring liquid level of the cast-in-situ bored pile. Figure 2

[0017] Figure 4 It is the connection structure schematic view of the multi-groove movable pulley and the multi-groove fixed pulley.

[0018] Figure 5 It is the connection structure schematic view of the telescopic arm segment.

[0019] Figure 6 It is the structure schematic view of the adjusting limiting mechanism.

[0020] The name corresponding to the serial number in the figure is:

[0021] 1, base, 2, telescopic arm, 3, telescopic rod, 4, pulley set, 5, steel casing, 6, sensor pull rope, 7, counterweight lifting rope, 8, industrial control all-in-one machine, 9, pull rope displacement sensor, 10, canopy, 11, vertical rod, 12, guide pulley, 13, counterweight block, 14, fixed rod, 15, multi-groove movable pulley, 16, multi-groove fixed pulley, 17, float lifting rope, 18, float, 19, walking wheel, 20, adjusting limiting mechanism, 21, guide wheel, 22, connecting bolt, 23, telescopic arm segment, 24, universal joint, 25, U-shaped frame, 26, clamping plate, 27, locking bolt. DETAILED DESCRIPTION

[0022] The technical solutions in the application will be described clearly and completely below in combination with the embodiments, and the described embodiments are only a part of the embodiments of the application, not all the embodiments.

[0023] Embodiment 1

[0024] ​The utility model provides a kind of bored pile underwater concrete pouring liquid level real-time monitoring device, it includes base 1 and pulley block 4, the middle position of base 1 is vertically fixedly installed with support frame, the upper end of support frame is installed with pull rope displacement sensor 9 and guide pulley 12, pulley block 4 includes multi-slot movable pulley 15 and multi-slot fixed pulley 16, the mounting bracket of multi-slot fixed pulley 16 is fixedly installed in the lower end of support frame, multi-slot movable pulley 15 is located directly above multi-slot fixed pulley 16, the sensor pull rope 6 of pull rope displacement sensor 9 is connected with the mounting bracket of multi-slot movable pulley 15, the mounting bracket of multi-slot movable pulley 15 is also connected with counterweight lifting rope 7, one end of counterweight lifting rope 7 is connected with the mounting bracket of multi-slot movable pulley 15, the other end of counterweight lifting rope 7 is connected with counterweight 13 after passing through guide pulley 12, the lower end of support frame or base 1 is fixedly connected with telescopic arm 2, guide wheel 21 is installed on telescopic arm 2, telescopic rod 3 for limiting support with steel casing 5 is connected on the both sides of the front end of telescopic arm 2, multi-slot movable pulley 15 and multi-slot fixed pulley 16 are wound with a float lifting rope 17, the upper end of float lifting rope 17 is fixedly connected with multi-slot movable pulley 15, the lower end of float lifting rope 17 is vertically connected with float 18 after passing through guide wheel 21.

[0025] The support frame includes four vertical rods 111, which are fixedly connected in parallel and vertically on the base 1, and are fixedly connected by the fixed rods 14 into a frame-shaped structure, and a canopy 10 is installed on the top of the four vertical rods 11, and a bearing plate is fixedly connected to the upper ends between the four vertical rods 11, and the pull rope displacement sensor 9 and the guide pulley 12 are fixedly connected to the bearing plate by bolts.

[0026] The telescopic arm 2 is composed of a plurality of telescopic arm segments 23 connected by the connecting bolts 22, and the guide wheels 21 are installed at the connections of the telescopic arm segments 23. The connecting angles of the telescopic arm segments 23 can be adjusted by loosening the connecting bolts 22, and the adjacent two telescopic arm segments 23 can be fixed by locking the connecting bolts 22.

[0027] The telescopic rod 3 adopts a telescopic locking structure with a large pipe sleeve and a small pipe, and the locking structure is arranged on the pipe body. The telescopic rod 3 can adopt an umbrella handle locking structure, or a threaded connection structure with a large pipe sleeve and a small pipe, in which the small pipe is provided with external threads, and the large pipe is provided with internal threads. One end of the telescopic rod 3 is connected to the telescopic arm 2 through the universal joint 24, and the other end of the telescopic rod 3 is connected to the adjusting limiting mechanism 20 for buckling on the wall of the steel casing 5 through the universal joint 24. The adjusting limiting mechanism 20 includes an inverted U-shaped frame 25, screw holes are arranged on the side edges of the inverted U-shaped frame 25, locking bolts 27 are installed in the screw holes, and the end portions of the locking bolts 27 are connected to the clamping plates 26 for abutting against the steel casing 5.

[0028] The bottom of the support rod 3 is provided with walking wheels 19, so that the support frame can be pushed to walk when not working.

[0029] The support frame is provided with an industrial computer 8, the industrial computer 8 is provided with a loudspeaker, the loudspeaker can broadcast intelligent early warning information, the industrial computer 8 is matched and connected with the pull rope displacement sensor 9 signal, the industrial computer 8 is provided with a wireless transmission module, the wireless transmission module transmits real-time data measured by the pull rope displacement sensor 9 to a cloud space; the monitoring device can be provided with a data analysis module and a data monitoring and early warning module, the data analysis module comprises an elevation calculation formula: H=H0-kx, and a depth calculation formula: h=kx; in the elevation calculation formula H=H0-kx, the real-time elevation of the underwater concrete of the monitoring point is denoted as H; H0 represents the top elevation of the steel casing; k represents the rope length magnification multiple of the pulley block; and x represents the real-time reading of the pull rope displacement sensor; in the depth calculation formula h=kx, the depth from the liquid surface of the underwater concrete of the monitoring point to the top elevation of the steel casing is denoted as h; k represents the rope length magnification multiple of the pulley block; and x represents the real-time reading of the pull rope displacement sensor; the data monitoring and early warning module comprises real-time monitoring of the underwater concrete elevation, intelligent early warning of the interval time length of the underwater concrete pouring being over time, early warning of the height difference between the real-time monitoring elevation of the underwater concrete and the back-propagation elevation of the poured underwater concrete being over limit, early warning of the guide pipe depth being over limit, and intelligent hierarchical early warning of the liquid surface elevation of the underwater concrete before reaching the target elevation; the data measured by the device system is subjected to data analysis, data monitoring and early warning; the system of the monitoring device can download data and automatically analyze the data to form a corresponding curve graph in the cloud space.

[0030] The early warning of the interval time length of the underwater concrete pouring being over time indicates that when the interval time length of the underwater concrete pouring exceeds the specification threshold value of 30 min, the intelligent device prompts that the interval time length of the underwater concrete pouring is too long.

[0031] The early warning of the height difference between the real-time monitoring elevation of the underwater concrete and the back-propagation elevation of the poured underwater concrete being over limit indicates that when the height difference between the real-time monitoring elevation of the underwater concrete and the back-propagation elevation of the poured underwater concrete exceeds the set value of 0.5 m, the intelligent device prompts that the bored pile may have a hole collapse phenomenon.

[0032] The early warning of the guide pipe depth being over limit indicates that when the concrete pouring guide pipe depth is greater than the specification threshold value of 2.5 m, the intelligent device prompts that one section of the guide pipe is removed.

[0033] The intelligent hierarchical early warning of the liquid surface elevation of the underwater concrete before reaching the target elevation corresponds to multiple target difference values, when the liquid surface elevation of the underwater concrete is less than the set difference value from the target elevation, the intelligent device prompts the difference value of the current liquid surface elevation of the underwater concrete from the target elevation, and when the difference value is 0, the intelligent device prompts that the underwater concrete pouring is completed.

[0034] The use steps of the real-time monitoring device for the underwater concrete pouring liquid surface of the bored pile are as follows.

[0035] Step 1: Monitoring Device Adjustment: Initially, purchase a rope displacement sensor; based on the drilling depth, mud density, underwater concrete density, and other working conditions, adjust the buoy density, counterweight weight, and number of pulley sets. When adjusting the buoy density, the following conditions must be met: G 浮漂实际 -F 配重等效 =ρ 浮漂等效 ×V 浮漂 The conditions must be met to ensure that the float rises with the underwater concrete level; when adjusting the weight of the counterweight, the following conditions must be met: 配重 -G 滑轮 -f 滑轮阻力 =F 配重等效 The condition of ×K, where G 浮漂实际 F is the actual weight of the float. 配重等效 ρ is the equivalent pulling force exerted on the float by the counterweight after being multiplied by the pulley system. 浮漂等效 For the float to be affected by F 配重等效 The equivalent density after action, V 浮漂 G is the volume of the float. 配重 For the weight of the counterweight, G 滑轮 For the weight of the multi-groove movable pulley, f 滑轮阻力 The frictional resistance of the pulley system is K, which is the magnification factor of the rope length in the pulley system, and ρ is the frictional resistance of the pulley system. 浮漂等效 According to ρ 泥浆 <ρ 浮漂 <ρ 砼 Based on the working conditions of the density of underwater concrete and mud on site, V was determined. 浮漂 According to the displacement method, G can be obtained. 浮漂实际 The result is obtained by measuring with a force gauge, therefore it can be calculated according to the formula G. 浮漂实际 -F 配重等效 =ρ 浮漂等效 ×V 浮漂 F is derived 配重等效 G 滑轮 f 滑轮阻力 F was calculated using a force gauge. 配重等效 According to formula G 浮漂实际 -F 配重等效 =ρ 浮漂等效 ×V 浮漂 Therefore, K is the magnification factor of the pulley system rope length, and thus, according to formula G... 配重 -G 滑轮 -f 滑轮阻力 =F 配重等效 ×K yields G 配重, ensure that the buoy in the process of rising fine steel wire rope can keep straight state; when adjusting the number of pulley blocks, according to the maximum stroke of the pull rope displacement sensor in the monitoring device and the hole forming depth of the bored pile, z1 represents the hole forming depth of the bored pile, z2 represents the maximum stroke of the pull rope displacement sensor in the monitoring device, so the number of pulley blocks z needs to be greater than z1 / z2.

[0036] Step two, monitoring device layout: after the device is assembled, move the device to the target bored pile position, deploy the telescopic arm and telescopic rod, and then fix the adjustable limiting mechanism on the steel casing; the device layout principle is to avoid the concrete pouring point and the steel bar dense part in the empty position to place the buoy, to ensure that the buoy can be smoothly lowered to the bottom of the bored pile; the tension displacement sensor of the device is integrated into the industrial personal computer through the connecting line, and the underwater concrete liquid level of the pulley block is monitored in real time on the industrial personal computer;

[0037] Step three, parameter setting and data initialization: after the buoy is leveled with the top elevation of the steel casing, the parameters are set and the data is initialized; the set parameters include the bored pile number and the bored pile depth; the data to be initialized includes the steel casing top elevation H0 and the pulley block rope length magnification k.

[0038] Step four, implement real-time monitoring application: after the bored pile is formed, before the underwater concrete pouring, first lower the buoy to the bottom of the bored pile hole, and then pour at the underwater concrete pouring point; because the buoy density is greater than the mud density and less than the concrete density, the monitoring device buoy will stay on the underwater concrete liquid surface and rise with the rise of the underwater concrete liquid surface; the data of the displacement of the buoy is scaled by the pulley block and transmitted to the pull rope displacement sensor, the pull rope displacement sensor uploads the measured data to the monitoring system, and after data analysis, the underwater concrete elevation is monitored in real time.

[0039] Step five, balanced control during pouring: during the pouring of underwater concrete, according to the amount of poured underwater concrete, the elevation is back calculated and compared with the real-time monitored elevation, when the difference is too large, it is judged as hole collapse.

[0040] Step six, intelligent early warning: when the underwater concrete pouring interval exceeds the specification threshold, the intelligent system prompts that the underwater concrete pouring interval is too long; when the real-time monitoring elevation of underwater concrete and the back-propagation elevation of the poured underwater concrete exceed the set value, the intelligent system prompts that the bored pile has a hole collapse phenomenon; when the concrete pouring guide pipe burial depth is greater than the specification threshold, the intelligent system prompts to remove a section of the guide pipe; the intelligent system provides hierarchical warning for the pulley block before the underwater concrete liquid surface elevation reaches the target elevation, and multiple target differences are set in advance; when the underwater concrete liquid surface elevation is less than the set difference from the target elevation, the intelligent system prompts the current underwater concrete liquid surface elevation difference from the target elevation; when the difference is 0, the intelligent system prompts that the underwater concrete pouring is completed.

[0041] Step seven, when the real-time elevation of underwater concrete exceeds the target elevation, the real-time monitoring of underwater concrete pouring of the bored pile is completed.

[0042] Implementation case:

[0043] A bored pile has a diameter of 1.5 m, a real pile length of 18 m, an empty pile length of 9 m, a steel casing top elevation of 72 m, a hole bottom elevation of 45 m, a real pile top elevation of 63 m, and a hole depth of 27 m. The use steps of the underwater concrete pouring liquid surface real-time monitoring device of the bored pile are as follows:

[0044] (1) Monitoring device deployment: purchase a 1.5 m long rope displacement sensor with a 4 N rope tension; according to the hole depth of 27 m, the real pile length of 18 m, the mud density of 1.1 g / cm3, and the underwater concrete density of 2.2 g / cm3 of the bored pile, deploy the density of the float, the weight of the counterweight, and the number of pulley blocks; when deploying the density of the float, the density of the float is set to 1.5 g / cm3, a cylindrical float with a diameter of 8 cm and a height of 9 cm is purchased, and the volume of the float is 452 cm 3 Therefore, the weight of the float is 0.68 kg, which meets the condition of G 浮漂实际 -F 配重等效 = p 浮漂等效 × V 浮漂 , ensuring that the float can rise with the rising of the underwater concrete liquid surface; when deploying the weight of the counterweight, the weight of the counterweight is set to 3 kg, which meets the condition of G 配重 -G 滑轮 -f 滑轮阻力 =F 配重等效 × K, where G 浮漂实际 is the actual weight of the float, F 配重等效 is the equivalent tension of the counterweight on the float after conversion by the pulley block, p 浮漂等效 is the equivalent density of the float under the action of F 配重等效 , and V 浮漂G is the volume of the float 配重 G is the gravity of the counterweight 滑轮 f is the gravity of the multi-groove movable pulley 滑轮阻力 K is the friction resistance of the pulley block, and ρ 浮漂等效 According to ρ 泥浆 < ρ 浮漂 < ρ 砼 According to the density of the on-site underwater concrete and the working condition of the mud density, V 浮漂 According to the drainage method, G 浮漂实际 Through force measurement, G 浮漂实际 -F 配重等效 =ρ 浮漂等效 ×V 浮漂 F 配重等效 ; G 滑轮 , f 滑轮阻力 Through force measurement, F 配重等效 has been obtained according to the formula G 浮漂实际 -F 配重等效 =ρ 浮漂等效 ×V 浮漂 , K is the rope length magnification of the pulley block, so according to the formula G 配重 -G 滑轮 -f 滑轮阻力 =F 配重等效 ×K, G 配重 is obtained, which ensures that the fine steel wire rope can remain straight during the rising process; when adjusting the number of pulley blocks, the maximum stroke of the pull rope displacement sensor in the monitoring device is 1.5 m, and the bored pile hole depth is 27 m, so the number of pulley blocks is determined as 18.

[0045] (2) Monitoring device layout: after the device is assembled, slowly push the device on the hardened surface of the site, and if necessary, manually carry it until it accurately reaches the target bored pile near the position, and then expand the telescopic arm and telescopic rod, and then firmly place the adjustable limiting mechanism on the steel casing; the device layout principle is to avoid placing the float in the empty position away from the concrete pouring point and the dense part of the steel bar; the diameter of a bored pile is 1.5 m, and the monitoring device is placed at a position 0.5 m away from the center point of the steel casing plane of the bored pile. The tension displacement sensor of the device is integrated into the industrial computer through the connecting line, and the underwater concrete liquid level elevation of the bored pile is monitored in real time on the industrial computer.

[0046] (3) Parameter setting and data initialization: after the float is leveled with the top elevation of the steel casing, the parameter setting and data initialization are performed, the bored pile number is set as KBZ8, and the bored pile hole depth is 27 m; the data to be initialized includes the steel casing top elevation H0 as 72 m, and the pulley block rope length magnification k as 18.

[0047] (4) Real-time monitoring application: After the cast-in-place pile is formed, the float is lowered to the bottom of the cast-in-place pile hole before underwater concrete pouring. Since the density of the float is greater than that of the mud and less than that of the concrete, the float of the monitoring device will stay on the underwater concrete liquid surface and rise with the rising of the underwater concrete liquid surface. The data of the displacement of the float is scaled by 18 times by the pulley block and then transmitted to the pull rope displacement sensor. The pull rope displacement sensor uploads the measured data to the monitoring system for data analysis, and then real-time monitoring of the underwater concrete elevation is performed.

[0048] (5) Balanced control during pouring: When the maximum difference in underwater concrete liquid surface elevation of the three measuring points is greater than the specification threshold of 50 cm, adjust the pouring speed of different underwater concrete pouring points to ensure balanced pouring of the concrete. During the pouring of the underwater concrete, the elevation can be inversely calculated according to the amount of poured underwater concrete and compared with the real-time monitored elevation. When the difference is too large, it can be judged that the hole has collapsed.

[0049] (6) Intelligent early warning: When the maximum difference in underwater concrete liquid surface elevation of the pulley block is greater than the specification threshold of 50 cm, the intelligent system will prompt that the relative height of the current concrete pouring is not uniform. When the interval time of underwater concrete pouring exceeds the specification threshold of 30 minutes, the intelligent system will prompt that the interval time of underwater concrete pouring is too long. When the difference between the real-time monitored elevation of the underwater concrete and the inversely calculated elevation of the poured underwater concrete exceeds the set value of 0.5 m, the intelligent system will prompt that the cast-in-place pile may have a hole collapse. When the buried depth of the concrete pouring guide pipe is greater than the specification threshold of 2.5 m, the intelligent system will prompt to remove a section of the guide pipe. The pulley block will intelligently provide a hierarchical warning before the underwater concrete liquid surface elevation reaches the target elevation. The target difference values are set to 5 m, 3 m, 1 m, and 0 m. When the underwater concrete liquid surface elevation is 5 m away from the target elevation, the intelligent system will prompt that the difference between the current underwater concrete liquid surface elevation and the target elevation is 5 m. When the underwater concrete liquid surface elevation is 3 m away from the target elevation, the intelligent system will prompt that the difference between the current underwater concrete liquid surface elevation and the target elevation is 3 m. When the underwater concrete liquid surface elevation is 1 m away from the target elevation, the intelligent system will prompt that the difference between the current underwater concrete liquid surface elevation and the target elevation is 1 m. When the difference is 0 m, the intelligent system will prompt that the underwater concrete pouring is complete.

[0050] (7) When the real-time elevations of the underwater concrete of the pulley block have all exceeded the target elevation, the real-time monitoring of the underwater concrete pouring of the cast-in-place pile is completed.

[0051] (8) After the monitoring is completed, the counterweight 13, the float 18, the pulley set 4, the pull rope displacement sensor 9, the guide pulley 12, the industrial computer 8, the telescopic arm 2, the telescopic rod 3, the adjusting limiting mechanism 20 and the support frame are sequentially removed, and the removed parts are transported to the next construction site for use or are transported back to the material turnover warehouse for maintenance and storage.

[0052] The above description is not a limitation of the present application, and the present application is not limited to the above examples. Within the scope of the present application, changes, modifications, additions or replacements made by those skilled in the art should be within the scope of the present application.

Claims

1. A real-time monitoring device for the liquid level of underwater concrete pouring in bored piles, characterized in that: The system includes a base (1) and a pulley assembly (4). A support frame is vertically fixed at the middle of the base (1). A pull rope displacement sensor (9) and a guide pulley (12) are installed at the upper end of the support frame. The pulley assembly (4) includes a multi-groove movable pulley (15) and a multi-groove fixed pulley (16). The mounting bracket of the multi-groove fixed pulley (16) is fixedly installed at the lower end of the support frame. The multi-groove movable pulley (15) is located directly above the multi-groove fixed pulley (16). The sensor pull rope (6) of the pull rope displacement sensor (9) is connected to the mounting bracket of the multi-groove movable pulley (15). The mounting bracket of the multi-groove movable pulley (15) is also connected to a counterweight rope (7). One end of the counterweight rope (7) is connected to the multi-groove movable pulley (15). The mounting bracket of the pulley (15) is connected, and the other end of the counterweight rope (7) passes over the guide pulley (12) and is connected to the counterweight block (13). The lower end of the support frame or the base (1) is fixedly connected to the telescopic arm (2). The telescopic arm (2) is equipped with the guide wheel (21). The front ends of the telescopic arm (2) are connected to the telescopic rods (3) for limiting and supporting the steel casing (5). A float rope (17) is wound around the multi-groove movable pulley (15) and the multi-groove fixed pulley (16) in multiple passes. The upper end of the float rope (17) is fixedly connected to the multi-groove movable pulley (15), and the lower end of the float rope (17) passes over the guide wheel (21) and is connected to the float (18).

2. The real-time monitoring device for underwater concrete pouring liquid level of bored piles according to claim 1, characterized in that: The base (1) is equipped with wheels (19) at its bottom.

3. The real-time monitoring device for underwater concrete pouring liquid level of bored piles according to claim 1, characterized in that: An industrial control computer (8) is installed on the support frame. The industrial control computer (8) is connected to the pull rope displacement sensor (9) by signal matching. The industrial control computer (8) is equipped with a wireless transmission module. The wireless transmission module transmits the real-time data measured by the pull rope displacement sensor (9) to the cloud space.

4. The real-time monitoring device for underwater concrete pouring liquid level of bored piles according to claim 1, characterized in that: The support frame includes four uprights (11), which are parallel and vertically fixed on the base (1). The four uprights (11) are fixedly connected to each other by fixing rods (14) to form a frame structure. A canopy (10) is installed on the top of the four uprights (11). A load-bearing plate is fixedly connected to the upper end of the four uprights (11). A rope displacement sensor (9) and a guide pulley (12) are fixed to the load-bearing plate by bolts.

5. The real-time monitoring device for underwater concrete pouring liquid level of bored piles according to claim 1, characterized in that: The telescopic arm (2) is composed of multiple telescopic arm segments (23) connected in sequence by connecting bolts (22), and guide wheels (21) are installed at the connection of the telescopic arm segments (23).

6. The real-time monitoring device for underwater concrete pouring liquid level of bored piles according to claim 1, characterized in that: The telescopic rod (3) adopts a telescopic locking structure with a large tube enclosing a small tube. The locking structure is set on the tube body. Alternatively, the telescopic rod (3) adopts a threaded connection structure with a large tube enclosing a small tube. The small tube is provided with an external thread, and the large tube is provided with an internal thread. One end of the telescopic rod (3) is connected to the telescopic arm (2) through a universal joint (24). The other end of the telescopic rod (3) is connected to an adjustment limiting mechanism (20) for fastening onto the wall of the steel casing (5) through a universal joint (24). The adjustment limiting mechanism (20) includes an inverted U-shaped frame (25). A screw hole is provided on the side of the inverted U-shaped frame (25). A locking bolt (27) is installed in the screw hole. The end of the locking bolt (27) is connected to a clamp (26) for pressing against the steel casing (5).

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