Concrete upper interface monitoring method and device

Abstract

The invention relates to the technical field of cast-in-situ bored pile construction and monitoring, and provides an underwater cast-in-situ bored concrete pile concrete upper interface monitoring method and device.The method comprises the steps that after a guide pipe is tripped into a drilled hole or before concrete is poured, a detector is tripped into the designated position in the drilled hole and made to be in a suspended state; the detector comprises a signal acquisition unit; the volume-weight value of the detector is larger than the specific gravity value of slurry and cement mortar and smaller than or equal to the specific gravity value of concrete; in the concrete pouring process, the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through the signal transmission line; the signal processing unit compares the inclination angle with a preset inclination angle threshold value, and when the comparison result is that the inclination angle is larger than the preset inclination angle threshold value, an alarm is given to prompt to slow down or stop concrete pouring. The concrete upper interface position and the pile forming quality can be better controlled, materials are saved, material waste is reduced, construction benefits are improved, and waste emission is reduced.

Description

Technical Field

[0001] The present application relates to the field of bored pile construction and monitoring technology, and in particular to a method and device for monitoring an upper concrete interface. Background Art

[0002] During the underwater concrete pouring process of bored piles, it is necessary to monitor and measure the position reached by the rising concrete interface to meet the design and quality requirements, improve efficiency, save materials, and reduce waste pollution. Because it is an underwater pouring operation, the rising degree and position of the upper top interface of the concrete cannot be directly visually determined, and can only be indirectly perceived, measured and determined with the help of some technical methods. The technical methods currently used and promoted in some markets are: 1. Conventional heavy hammer measuring rope measurement method: This method uses a measuring rope with a heavy hammer, which is suspended by a hammer. When the concrete reaches a certain position, it is measured again. It is a lagging measurement and often depends on human subjective initiative. This method is often affected by human subjective initiative. It may not be measured in time and actively, which often causes a large amount of concrete over-pouring (relative to the designed pile top height), especially when the hole depth from the designed pile top to the ground is large and the pile diameter is small, causing serious over-pouring. Therefore, a large amount of concrete is wasted, resulting in secondary operations such as later demolition, and a large amount of waste is generated, increasing costs. 2. Resistance value type, electrical impedance method (electrochemical performance) technical methods: In order to overcome the shortcomings of conventional methods, some unconventional monitoring technical methods have emerged in the market, mainly using resistance type and electrical impedance (electrochemical performance) methods. These methods have their own characteristics, but their shortcomings or disadvantages are: (1) The interference factors are more complicated. For example, the electrical impedance method requires mud wall protection during the drilling process. The modulated mud (or chemical mud), cement mortar and groundwater used not only contain chemical substances of different components, but also have considerable viscosity. When the detector passes through the mixture of mud, cement mortar, etc., its sticky substances will adhere to the surface of the detector. When it contacts the concrete, it cannot remove the attached substances, thus affecting the perception of the concrete (blocking and shielding), which may cause misjudgment and missed judgment (the calibration object of this method is the threshold of concrete). Or when the amount of concrete used in the same borehole is large, or the amount of additives is used for adjustment, the electrochemical properties of the concrete at the top may be different from the initial calibration value, which may change its electrochemical properties, thereby causing the threshold to change, or because of the leaching of concrete, more cement mortar (forming slurry) is produced, which may cause misjudgment. The resistance type uses the different densities of concrete, mud, and water, and uses a micro-motor-driven rotating device to measure the resistance value (resistance method) for judgment. It is easily affected by suspended particles, concrete slump, etc. (2) The process is cumbersome and inconvenient to use. Resistance type: The detection component needs to be positioned and fixed in advance at a certain depth with the help of a steel cage in the lower hole. Electrical impedance method: The detector needs to be pushed to the required detection depth with the help of a push rod. Each time the detector is pushed, the concrete pouring operation needs to be suspended, affecting the pouring process, and there is still a lag in monitoring and forecasting. (3) The purchase cost is high and it is easy to be damaged and disabled.Resistance type: Because the detection component needs to be pre-tied and positioned on the top of the steel cage, after the detection component is lowered into the hole with the steel cage, there is a problem of collision damage or failure in the process of lowering into the conduit used to transport concrete, which makes the monitoring and judgment unable to be completed. (4) High cost of use: Because the detection component needs to be pre-tied and positioned on the top of the steel cage, there is a problem of collision damage or failure in the conduit used to transport concrete. Or because the fixed binding needs to be forcibly pulled off, it cannot be retrieved or damaged. (5) Inconvenient: It cannot be freely and flexibly positioned at any time; or it interferes with the normal concrete pouring process. Therefore, how to solve the shortcomings of the above methods, better control the quality of concrete piles, save materials, reduce material waste, improve construction efficiency, and reduce waste emissions is a technical problem that needs to be solved urgently. Summary of the invention

[0003] In response to the above technical problems, the purpose of this application is to provide a concrete upper interface monitoring method and device, aiming to solve the shortcomings of the above-mentioned methods, better control the quality of concrete piles, save materials, reduce material waste, improve construction efficiency, and reduce waste emissions.

[0004] In a first aspect, an embodiment of the present application provides a method for monitoring an upper concrete interface, which is applied to an underwater concrete pouring process of bored piles. The method is implemented based on a monitoring device for an upper concrete interface, and the upper concrete interface monitoring device includes a signal acquisition unit, a signal processing unit, an expansion unit, and an acoustic and optical display unit. The signal acquisition unit is connected to the signal processing unit via a signal transmission line, and the signal transmission line adopts a bundled cable, which also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the acoustic and optical display unit. The signal acquisition unit includes any one or both of a mechanical inclinometer and an electronic inclinometer level. The method includes: After the guide tube is lowered into the borehole or before concrete is poured, the detector is lowered into a designated position in the borehole and is suspended; wherein the designated position is a position where concrete pouring stops or a warning position; the detector includes the signal acquisition unit; the bulk density value of the detector is greater than the specific gravity value of mud and cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; During the concrete pouring process, the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through the signal transmission line; The signal processing unit receives the tilt angle collected by the signal collection unit, and compares the tilt angle with a preset tilt angle threshold; wherein, when the tilt angle is greater than or equal to the tilt angle threshold, it indicates that the upper surface of the concrete reaches the concrete pouring stop position or the warning position; If the comparison result is that the inclination angle is greater than or equal to the inclination angle threshold, the expansion unit drives the sound and light display unit to issue an alarm to prompt the user to stop or slow down the pouring of concrete.

[0005] Furthermore, the upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

[0006] Furthermore, the detector is cylindrical or spherical.

[0007] Furthermore, a depth mark is provided on the surface of the bundled cable.

[0008] Furthermore, the bundled cables are made of strong materials.

[0009] Furthermore, the tilt angle threshold is determined by the following method: Put the detector into a transparent plastic test bucket and keep it in a hanging state; Pour mud, cement mortar and concrete into the transparent plastic test barrel in sequence; When the concrete is observed to rise to the position of the detector, the inclination angle collected by the test detector at this time is recorded; Repeat the test trials to obtain the tilt angle obtained by multiple test trials; determining an outlier based on the tilt angle; The outlier is deleted, and the average value of the remaining tilt angle data is calculated, and the calculated average value is used as the tilt angle threshold.

[0010] Furthermore, the concrete upper interface monitoring device includes a power supply, and the power supply is a built-in battery.

[0011] Furthermore, before lowering the detector into the hole to stop concrete pouring or to detect the warning position, the method further includes: The detector is lowered into the monitoring buried pipe depth position to monitor the buried pipe depth of concrete during the pouring process.

[0012] In a second aspect, an embodiment of the present application further provides a concrete upper interface monitoring device, the device comprising: The detector includes a signal acquisition unit; the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through a signal transmission line; wherein the detector is used to be placed in a borehole, the bulk density value of the detector is greater than that of mud and cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; A signal processing unit, wherein the signal processing unit receives the inclination angle collected by the signal collection unit and compares the inclination angle with a preset inclination angle threshold; wherein, when the inclination angle is greater than or equal to the inclination angle threshold, it indicates that the concrete has reached the position of the detector; The expansion unit and the sound and light display unit are configured to drive the sound and light display unit to issue an alarm if the comparison result shows that the tilt angle is greater than or equal to the tilt angle threshold; The signal acquisition unit is connected to the signal processing unit via a signal transmission line, the signal transmission line adopts a bundled cable, and the bundled cable also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the sound and light display unit.

[0013] Furthermore, the upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

[0014] Furthermore, the detector is cylindrical or spherical.

[0015] Furthermore, a depth mark is provided on the surface of the bundled cable.

[0016] Compared with the conventional weight-hammer type rope measurement method, the present application can automatically give advance warnings, avoiding the serious over-pouring problem caused by manual failure to take timely and active measurements, thereby better controlling the quality of concrete piles, saving materials, reducing material waste, providing construction benefits, and reducing waste emissions. In addition, the present application adopts the gravity type (hydrometer principle) method, and uses the mechanical inclinometer principle and the electronic inclinometer level technical method as the detection and perception basis. The inclination or imbalance state of the detector in different density (specific gravity) media is used to determine whether it is concrete. Compared with the resistance type and electrical impedance method, it is less subject to interference factors, more direct and clear, and less prone to misjudgment. In addition, compared with the existing methods, the technical method of the present application is simple and does not need to be calibrated when used. There is no need to bundle and fix in advance. The detector can be lowered after the catheter is lowered into the borehole or before the concrete is poured to avoid damage and collision of the detector. The detector can be placed in the hole and lifted up and down at any time, making it more convenient to use. Two sensing detection technologies are used, which is more reliable. The monitoring display uses sound and light to alarm, which is intuitive. The concrete upper interface monitoring device of the present application has a simple technical method, low purchase cost and low use cost. The concrete upper interface monitoring device of the present application has a simple structure, small size and is easy to carry. The present application is easier to popularize, more suitable for the construction use environment, and reduces the use cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution of the present application, the drawings required for use in the implementation manner will be briefly introduced below. Obviously, the drawings described below are only some implementation manners of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 It is a structural schematic diagram of a concrete upper interface monitoring device provided in one embodiment of the present application.

[0019] Figure 2 It is a flow chart of a method for monitoring the upper interface of concrete provided in one embodiment of the present application; DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0021] It will be understood by those skilled in the art that, unless expressly stated, the singular forms "a", "an", "above", and "the" used herein may also include plural forms. It should be further understood that the term "comprising" used in the specification of the present application refers to the presence of features, integers, steps, operations, elements, modules, and / or components, but does not exclude the presence or addition of one or more other features, integers, steps, operations, elements, modules, components, and / or groups thereof. It should be understood that when we refer to an element as being "connected" or "coupled" to another element, it may be directly connected or coupled to the other element, or there may be an intermediate element. In addition, the "connection" or "coupling" used herein may include wireless connection or wireless coupling. The term "and / or" used herein includes all or any module and all combinations of one or more associated listed items.

[0022] It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as generally understood by those skilled in the art to which this application belongs. It should also be understood that terms such as those defined in common dictionaries should be understood to have meanings consistent with the meanings in the context of the prior art, and will not be interpreted with idealized or overly formal meanings unless specifically defined as here.

[0023] The present application provides a method for monitoring the upper surface of concrete, which is applied to the underwater concrete pouring process of bored piles. The method is implemented based on a monitoring device for the upper surface of concrete, such as Figure 1As shown, the concrete upper interface monitoring device includes a signal acquisition unit, a signal processing unit, an expansion unit and an acoustic and optical display unit. The signal acquisition unit is connected to the signal processing unit through a signal transmission line. The signal transmission line adopts a bundled cable, and the bundled cable also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the acoustic and optical display unit. The signal acquisition unit includes any one or two of a mechanical inclinometer and an electronic inclinometer level. Figure 2 As shown, the method includes: S1. After the guide tube is lowered into the borehole or before concrete is poured, the detector is lowered into a designated position in the borehole and is suspended; wherein the designated position is a position where concrete pouring stops or a warning position; the detector includes the signal acquisition unit; the bulk density value of the detector is greater than the specific gravity value of the mud, the bulk density value of the detector is greater than the specific gravity value of the cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; S2. During the concrete pouring process, the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through the signal transmission line; S3, the signal processing unit receives the inclination angle collected by the signal collection unit, and compares the inclination angle with a preset inclination angle threshold; wherein, when the inclination angle is greater than or equal to the inclination angle threshold, it indicates that the upper interface of the concrete reaches the concrete pouring stop position or the warning position; S4. If the comparison result is that the tilt angle is greater than or equal to the tilt angle threshold, the expansion unit drives the sound and light display unit to issue an alarm to prompt to stop pouring concrete or slow down the pouring of concrete.

[0024] In the embodiment of the present application, when the detector includes both a mechanical inclinometer and an electronic inclinometer, after the concrete upper interface monitoring device is turned on, the mechanical inclinometer and the electronic inclinometer can be selected to work simultaneously, or only the mechanical inclinometer or only the electronic inclinometer can be selected to work. When the mechanical inclinometer and the electronic inclinometer are selected to work simultaneously, if the signal processing unit determines that the inclination angle collected by the mechanical inclinometer is greater than the inclination angle threshold, the expansion unit drives the sound and light display unit to issue an alarm, and the alarm can be any one of sound and light or both are displayed simultaneously to prompt the stop of concrete pouring. If the signal processing unit determines that the inclination angle collected by the electronic inclinometer is greater than the threshold, the expansion unit drives the sound and light display unit to issue an alarm to prompt the stop of concrete pouring. That is to say, if the mechanical inclinometer and the electronic inclinometer are selected to work simultaneously, two alarms will appear, which can improve the reliability of monitoring. The sounds of the two alarms can be the same or different. It should be noted that the expansion unit drives the sound and light display unit to issue an alarm by amplifying the power increment of the signal of the signal processing unit.

[0025] The principle of this scheme is as follows: According to the underwater concrete pouring process, when the bored pile is pouring concrete into the hole, the drainage displacement method is used to pour concrete into the bottom of the hole. Therefore, in the process of pouring concrete, the concrete with a larger specific gravity is at the bottom, and the cement mortar with smaller particles (concentrated mud containing particles), fine suspended mud, and thinner mud are distributed upward in this order. As the concrete is continuously poured, it rises upward (to the surface) in this order, and the pouring is stopped when the concrete reaches the designed depth. During the concrete pouring process, the thin mud, fine suspended mud, cement mortar with smaller particles (concentrated mud containing particles), concrete and other media in the borehole will rise to the detector preset in the borehole when the amount of concrete poured reaches a certain amount. Because the specific gravity of these media is different, the lifting force (buoyancy) generated on the detector is also different. When the specific gravity value of the medium is smaller than the bulk density value of the detector, the detector in a suspended state cannot be lifted and deflected. When the concrete with a specific gravity value greater than the bulk density value of the detector reaches the detector, the lifting force generated will lift the suspended detector to cause it to tilt. When the tilt angle reaches the threshold, the alarm signal is triggered. It should be noted that although the specific gravity (density) values ​​of concrete, cement mortar, and mud will each have some differences in variation, in the construction process requirements and construction process of bored piles, their specific gravity requirements have a relatively fixed interval value. In other words, this application utilizes the physical properties of the specific gravity differences of concrete, cement mortar with smaller particles (concentrated mud containing particles), fine suspended mud, and thinner mud, and adopts a gravity-type (hydrometer principle) method, with the principle of a mechanical inclinometer and the technical method of an electronic inclinometer level as the basis for detection and perception, and uses the inclination or imbalance state of the detector in different density (specific gravity) media to determine whether it is concrete.

[0026] Compared with the conventional weight-hammer type rope measurement method, the present application can automatically give advance warnings, avoiding the serious over-pouring problem caused by manual failure to take timely and active measurements, thereby better controlling the quality of concrete piles, saving materials, reducing material waste, providing construction benefits, and reducing waste emissions. In addition, the present application adopts the gravity type (hydrometer principle) method, and uses the mechanical inclinometer principle and the electronic inclinometer level technical method as the detection and perception basis. The inclination or imbalance state of the detector in different density (specific gravity) media is used to determine whether it is concrete. Compared with the resistance type and electrical impedance method, it is less subject to interference factors, more direct and clear, and less prone to misjudgment. In addition, compared with the existing methods, the technical method of the present application is simple and does not need to be calibrated when used. There is no need to bundle and fix in advance. The detector can be lowered after the catheter is lowered into the borehole or before the concrete is poured to avoid damage and collision of the detector. The detector can be placed in the hole and lifted up and down at any time, making it more convenient to use. Two sensing detection technologies are used, which is more reliable. The monitoring display uses sound and light to alarm, which is intuitive. The concrete upper interface monitoring device of the present application has a simple technical method, low purchase cost and low use cost. The concrete upper interface monitoring device of the present application has a simple structure, small size and is easy to carry. The present application is easier to popularize, more suitable for the construction use environment, and reduces the use cost.

[0027] In one embodiment, a depth mark is provided on the surface of the bundled cable.

[0028] In an embodiment of the present application, depth markings are provided on the surface of the bundled cable to facilitate construction personnel to accurately determine the lowering depth of the detector. During the underwater concrete pouring process of bored piles, accurately grasping the position depth of the detector in the borehole is crucial for accurately monitoring the concrete interface. By directly observing the depth markings on the surface of the cable, construction personnel can quickly and intuitively know the current depth value of the detector without the aid of additional complex measuring tools, thereby ensuring that the detector can be accurately lowered to the designated concrete stop pouring position or other key monitoring depth points, effectively improving the convenience and accuracy of construction operations, and reducing monitoring data deviations or construction errors caused by depth positioning errors.

[0029] Secondly, it helps improve construction efficiency. During the construction process, it may be necessary to adjust the depth of the detector several times to meet the needs of concrete pouring monitoring at different stages. With the depth mark, construction workers can quickly adjust the detector to the required depth, saving time for measurement and adjustment, making the entire concrete pouring construction process smoother, reducing unnecessary construction delays, and helping to improve the overall construction efficiency and progress control of the project.

[0030] In one embodiment, the bundled cables are made of strong materials.

[0031] In the embodiment of the present application, the bundled cable is made of strong material, has strong tensile force, is corrosion-resistant and wear-resistant, and the bundled cable made of strong material makes the entire concrete upper interface monitoring device more durable and prolongs its service life. Because it can withstand large tensile force and is not prone to damage such as breakage, wear or deformation, it reduces the monitoring interruption or device maintenance and replacement frequency caused by cable failure, reduces the maintenance cost and time cost during the construction process, ensures the continuity and efficiency of concrete pouring construction, is conducive to the smooth progress of the project and indirectly improves the economic benefits.

[0032] In one embodiment, the upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

[0033] In the embodiment of the present application, the upper part of the detector is heavier than the lower part, which means that the mass of the upper part of the detector is greater than the mass of the lower part of the detector, and the upper part of the detector is the suspension connection end, that is, the end connected to the transmission line. During the concrete pouring process, as the concrete gradually rises and approaches the detector, the force exerted by the concrete on the bottom of the detector will cause the detector to tilt. Since the center of gravity of the detector is upward, these tiny forces can cause the detector to have obvious tilt changes, thereby improving the sensitivity of the detector to the rise of concrete and being able to more accurately sense the situation of concrete reaching the vicinity of the detector. In addition, the eccentric device can be a counterweight block that deflects around the axis point. The provision of an eccentric device can accelerate the deflection of the detector and improve sensitivity.

[0034] In one embodiment, the detector is cylindrical or spherical.

[0035] In the embodiment of the present application, the detector is made more sensitive by setting the detector to be cylindrical or spherical.

[0036] In one embodiment, the tilt angle threshold is determined by the following method: Put the detector into a transparent plastic test bucket and keep it in a hanging state; Pour mud, cement mortar and concrete into the transparent plastic test barrel in sequence; When the concrete is observed to rise to the position of the detector, the inclination angle collected by the test detector at this time is recorded; Repeat the above test multiple times to obtain the tilt angle obtained by multiple test trials; determining an outlier based on the tilt angle; The outlier is deleted, and the average value of the remaining tilt angle data is calculated, and the calculated average value is used as the tilt angle threshold.

[0037] In the embodiment of the present application, specifically, the test detector is lowered into a transparent plastic test barrel through a bundled cable, and then mud, cement mortar, and concrete are poured into the transparent plastic test barrel in sequence to simulate a real construction environment. During the pouring process, it is necessary to closely observe the rise of the concrete. When the concrete is clearly observed to rise to the position of the test detector through the wall of the transparent plastic test barrel, the inclination angle value collected by the test detector at this time is recorded. In order to make the final determined inclination angle threshold more scientific, reliable and representative, it is necessary to repeat the above test test (the above test test refers to the step of lowering the detector into a transparent plastic test barrel and making it in a hanging state; pouring mud, cement mortar, and concrete into the transparent plastic test barrel in sequence; when the concrete is observed to rise to the position of the detector, recording the inclination angle collected by the test detector at this time) for multiple times, and multiple groups of inclination angle data of the test detector when the concrete reaches its position under different conditions can be obtained for subsequent in-depth analysis. Based on the inclination angle data set obtained from the multiple test experiments, the outliers are determined next. There are many ways to determine outliers, such as using the standard deviation method in statistics. First, calculate the mean value ( ) and standard deviation ( ) of this set of tilt angle data, and regard the data that exceeds a certain multiple (such as 3 times) of the standard deviation from the mean value as outliers, that is, the angle data points that meet the criteria can be determined as outliers. After identifying the outliers, delete them from the data set to eliminate the interference of these abnormal data that may be caused by measurement errors, accidental factors, etc. on the subsequent threshold determination. After deleting the outliers, process the remaining tilt angle data. Calculate the average value of these remaining angle data, and use the calculated average value as the tilt angle threshold. In the process of determining the threshold, the present application performs outlier processing on the data obtained from multiple tests, and then takes the average value of the remaining data as the threshold. This operation can effectively eliminate the interference of abnormal tilt angle data caused by accidental factors. By removing outliers, the threshold can better represent the true critical value of the tilt angle of the test detector under normal perfusion conditions.

[0038] In one embodiment, the concrete upper interface monitoring device may further include a communication module, which is communicatively connected to the concrete conveying equipment. When the detector monitoring mode is in the monitoring over-pouring mode and the inclination angle collected by the signal acquisition unit is greater than the inclination angle threshold and the above, a first control instruction is generated and the first control instruction is sent to the concrete conveying equipment to cause the concrete conveying equipment to stop concrete pouring or slow down the concrete pouring speed. For example, slowing down the concrete pouring speed can adjust the concrete pouring speed by controlling the pumping speed of the concrete pump or controlling the opening degree of the discharge port.

[0039] In one embodiment, the concrete upper interface monitoring device includes a power source, and the power source is a built-in battery.

[0040] In an embodiment of the present application, the power source is a built-in battery that can be repeatedly charged or replaced. The use of a built-in battery as a power source frees the concrete upper interface monitoring device from dependence on an external fixed power source. At the bored pile underwater concrete pouring construction site, the environment is complex and changeable, and there may be problems such as inconvenient location of power sockets and difficulty in laying power supply lines. The built-in battery-powered mode allows the monitoring device to be conveniently placed in a suitable location near the borehole without having to consider the cumbersome external power connection issue, greatly improving the flexibility and convenience of the device's layout at the construction site.

[0041] In one embodiment, before lowering the detector into the hole to the concrete pouring stop position or the warning position, the method further includes: The detector is lowered into the monitoring buried pipe depth position to monitor the buried pipe depth of concrete during the pouring process.

[0042] In the embodiment of the present application, by using a detector to monitor the depth of the buried concrete pipe during the concrete pouring process, it is possible to avoid accidents caused by excessive burying of pipes, which may result in the inability to pull out the pipes, and the resulting quality problems of the bored piles, thereby better controlling the quality of the concrete piles. In the underwater concrete pouring process, the buried depth of the poured concrete pipe has the following requirements: the pipe mouth is 300mm~500mm away from the bottom hole, the buried depth of the first pouring should not be less than 1 meter, and the buried depth is guaranteed to be 2~6 meters during the pouring process. Therefore, when placing the detector to monitor the buried depth of concrete during the pouring process, the detector needs to be pulled to a position 2~6 meters away from the bottom of the pipe, and as the pipe rises, the detector rises synchronously with it. The outer surface of the pipe can be set with a depth indication to quickly determine the height of the pipe rise.

[0043] In the embodiment of the present application, specifically, after the conduit is lowered into the borehole or before the concrete is poured, the detector is lowered into the borehole and placed at the depth position of the concrete buried pipe. When the detector collects an inclination angle greater than or equal to the inclination angle threshold, it means that the concrete has risen to the depth position of the concrete buried pipe, and an early warning is issued. At this time, the conduit can be raised by a certain distance, and the calculation formula of the certain distance is: s2=6-s1; wherein s1 represents the distance between the detector and the bottom of the conduit, s1 is greater than 2 meters, and s2 is the certain distance. For example, if the detector is placed at a position 4 meters away from the bottom of the conduit, then when the concrete rises to the position of the detector, the conduit is raised by 2 meters, and the detector is raised by 2 meters at the same time.

[0044] The present application also provides a concrete upper interface monitoring device, the device comprising: A detector, the detector comprising a signal acquisition unit; the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through a signal transmission line; wherein the detector is used to be placed in a borehole, the bulk density value of the detector is greater than the specific gravity value of the mud, the bulk density value of the detector is greater than the specific gravity value of the cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; A signal processing unit, wherein the signal processing unit receives the inclination angle collected by the signal collection unit and compares the inclination angle with a preset inclination angle threshold; wherein, when the inclination angle is greater than or equal to the inclination angle threshold, it indicates that the concrete has reached the position of the detector; The expansion unit and the sound and light display unit are configured to drive the sound and light display unit to issue an alarm if the comparison result shows that the tilt angle is greater than or equal to the tilt angle threshold; The signal acquisition unit is connected to the signal processing unit via a signal transmission line, the signal transmission line adopts a bundled cable, and the bundled cable also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the sound and light display unit.

[0045] The detector of the present application can be moved up and down and lowered at any time in the borehole, and placed at any depth in the hole for monitoring, early warning and forecasting. For example, it can be preset below the designed pile top for advance warning, and preset at the designed pile top depth, or virtual pouring depth for positioning monitoring and forecasting. It can also be used to monitor the depth of concrete buried pipes during the pouring process to avoid accidents caused by excessive buried pipes, which can cause the catheter to be unable to be pulled out, and the quality problems of the bored piles caused by this. In addition, the detector can also be placed in the borehole after the concrete pouring stops. Due to its own gravity, the detector will pass through the mud and cement mortar (also called floating slurry) in turn to reach the upper interface of the concrete. When the inclination angle collected by the detector is greater than the inclination angle threshold, the depth of the detector is measured by the depth mark on the bundled cable, so that the distance between the concrete and the hole mouth can be determined, and then the position of the upper interface of the concrete can be determined. Compared with the aforementioned advance warning, this is a lagging usage similar to a heavy hammer.

[0046] In one embodiment, the upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

[0047] In one embodiment, the detector is cylindrical or spherical.

[0048] In one embodiment, a depth mark is provided on the surface of the bundled cable.

[0049] In one embodiment, the bundled cables are made of strong materials.

[0050] In one embodiment, the concrete upper interface monitoring device includes a power source, and the power source is a built-in battery.

[0051] Those skilled in the art can understand that the implementation of the above-mentioned embodiment method part of the process can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the process of the embodiment of each method as described above. Among them, any reference to memory, storage, database or other medium provided in this application and used in the embodiment can include non-volatile and / or volatile memory. Non-volatile memory can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory can include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in a variety of forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double-speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (Rambus) direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0052] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0053] The above description is only a preferred embodiment of the present application, and does not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A method for monitoring the upper interface of concrete, characterized in that: The method is applied to the underwater concrete pouring process of bored piles. The method is implemented based on a concrete upper interface monitoring device. The concrete upper interface monitoring device includes a signal acquisition unit, a signal processing unit, an expansion unit, and an acoustic and optical display unit. The signal acquisition unit is connected to the signal processing unit via a signal transmission line. The signal transmission line adopts a bundled cable, and the bundled cable also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the acoustic and optical display unit. The signal acquisition unit includes any one or both of a mechanical inclinometer and an electronic inclinometer level. The method includes: After the guide tube is lowered into the borehole or before concrete is poured, the detector is lowered into a designated position in the borehole and is suspended; wherein the designated position is a position where concrete pouring stops or an early warning position; the detector includes the signal acquisition unit; the bulk density value of the detector is greater than the specific gravity value of the mud, the bulk density value of the detector is greater than the specific gravity value of the cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; During the concrete pouring process, the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through the signal transmission line; The signal processing unit receives the tilt angle collected by the signal collection unit, and compares the tilt angle with a preset tilt angle threshold; wherein, when the tilt angle is greater than or equal to the tilt angle threshold, it indicates that the upper surface of the concrete reaches the concrete pouring stop position or the warning position; If the comparison result is that the inclination angle is greater than or equal to the inclination angle threshold, the expansion unit drives the sound and light display unit to issue an alarm to prompt the user to stop or slow down the pouring of concrete.

2. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

3. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The detector is cylindrical or spherical.

4. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The surface of the bundled cable is provided with a depth mark.

5. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The bundled cable is made of strong material.

6. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The tilt angle threshold is determined by the following method: Put the detector into a transparent plastic test bucket and keep it in a hanging state; Pour mud, cement mortar and concrete into the transparent plastic test barrel in sequence; When the concrete is observed to rise to the position of the detector, the inclination angle collected by the test detector at this time is recorded; Repeat the test trials to obtain the tilt angle obtained by multiple test trials; determining an outlier based on the tilt angle; The outlier is deleted, and the average value of the remaining tilt angle data is calculated, and the calculated average value is used as the tilt angle threshold.

7. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: The concrete upper interface monitoring device comprises a power source, which is a built-in storage battery.

8. The method for monitoring the upper interface of concrete according to claim 1, characterized in that: Before lowering the detector into the hole to the concrete pouring stop position or the early warning position, the method further comprises: The detector is lowered into the monitoring buried pipe depth position to monitor the buried pipe depth of concrete during the pouring process.

9. A concrete upper interface monitoring device, characterized in that: The device comprises: The detector comprises a signal acquisition unit; the signal acquisition unit transmits the acquired inclination angle relative to the vertical direction of the detector to the signal processing unit through a signal transmission line; wherein the detector is used to be placed in a borehole, the bulk density value of the detector is greater than the specific gravity value of the mud, the bulk density value of the detector is greater than the specific gravity value of the cement mortar, and the bulk density value of the detector is less than or equal to the specific gravity value of the concrete; A signal processing unit, wherein the signal processing unit receives the inclination angle collected by the signal collection unit and compares the inclination angle with a preset inclination angle threshold; wherein, when the inclination angle is greater than or equal to the inclination angle threshold, it indicates that the concrete has reached the position of the detector; The expansion unit and the sound and light display unit are configured to drive the sound and light display unit to issue an alarm if the comparison result shows that the tilt angle is greater than or equal to the tilt angle threshold; The signal acquisition unit is connected to the signal processing unit via a signal transmission line, the signal transmission line adopts a bundled cable, and the bundled cable also serves as a pulling rope. The signal processing unit is connected to the expansion unit, and the expansion unit is connected to the sound and light display unit.

10. The concrete upper interface monitoring device according to claim 9, characterized in that: The upper part of the detector is heavier than the lower part, and an eccentric device is provided; wherein the upper part of the detector is a hanging connection end.

11. The concrete upper interface monitoring device according to claim 9, characterized in that: The detector is cylindrical or spherical.

12. The concrete upper interface monitoring device according to claim 9, characterized in that: The surface of the bundled cable is provided with a depth mark.

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