Concrete strength detection device and method

Abstract

The present application discloses a concrete strength detection device and method, the concrete strength detection device comprises an experimental frame, a guide rail mechanism fixedly connected to the experimental frame and vertically arranged, a motor drill slidably connected to the guide rail mechanism, and a monitoring and control system for monitoring the drilling parameters of the motor drill and controlling the motor drill. The concrete strength detection device provided by the present application controls the drilling pressure, rotation speed, and torque during the drilling process to ensure that concrete test blocks of different strengths can be drilled, facilitate the use of drilling parameters to detect concrete strength, and improve the convenience and accuracy of detection.

Description

Technical Field

[0001] The present application relates to the field of concrete strength detection, and in particular to a concrete strength detection device and method. Background Art

[0002] Existing concrete strength testing methods are mainly divided into two types: non-destructive testing methods and destructive testing methods. Among them, non-destructive testing methods include rebound method, ultrasonic testing method, geological radar testing method, etc. Although non-destructive testing methods will not cause damage to concrete components, the data detected by them are only indirect data, and they need to be converted to obtain concrete strength, and the error is large. Destructive testing methods include core sampling method, pull-out method, etc., which not only damage concrete structural parts, but also the core sampling method is a way of sampling and inspection, and the time interval for obtaining the experimental report is long, which seriously restricts the progress of construction and increases the project budget cost. Compared with non-destructive testing methods, destructive testing methods can intuitively obtain the strength value of concrete, but the accuracy of its test results is difficult to guarantee. The corresponding two concrete strength testing methods have the defects of low efficiency, high labor consumption and complex operation.

[0003] Therefore, how to optimize concrete strength testing becomes a technical problem that needs to be solved by technicians in this field. Summary of the invention

[0004] The purpose of the present application is to provide a concrete strength detection device to improve the convenience and accuracy of concrete strength detection. Another purpose of the present application is to provide a concrete strength detection method using the above concrete strength detection device.

[0005] To achieve the above-mentioned objectives, the present application provides a concrete strength detection device, comprising an experimental frame, a guide rail mechanism fixedly connected to the experimental frame and vertically arranged, a motor drill slidably connected to the guide rail mechanism, and a monitoring and control system for monitoring the drilling parameters of the motor drill and controlling the motor drill.

[0006] Optionally, the motor drill includes a drill body and a hydraulic motor for driving the drill body to rotate, and the monitoring and control system includes a first monitoring module for monitoring the flow and pressure difference of the hydraulic motor, and a laser displacement sensor arranged on the experimental frame and used to monitor the lifting and lowering displacement of the motor drill.

[0007] Optionally, the experimental frame includes a top frame, a bottom frame and a plurality of groups of columns connecting the top frame and the bottom frame, and the cross beams of the bottom frame are relatively arranged to form a fixing mechanism for clamping a concrete test block.

[0008] Optionally, the guide rail mechanism includes a left guide rail and a right guide rail that are arranged in parallel and opposite to each other, the motor drill is connected to a drill fixing frame, and guide rail sliders that cooperate with the left guide rail and the right guide rail are respectively arranged at both ends of the drill fixing frame.

[0009] Optionally, the left guide rail and the right guide rail are both dual-axis linear guide rails, the guide rail sliders are four-wheel locking sliders, and the four-wheel locking sliders are provided with locking bolts.

[0010] Optionally, it further comprises a drilling pressure configuration frame for carrying heavy objects, wherein the drilling pressure configuration frame is arranged on the top of the motor drill and is fixedly connected to the motor drill.

[0011] Optionally, the columns and the cross beams of the top frame, as well as the columns and the cross beams of the bottom frame, are all provided with connecting angle brackets.

[0012] Optionally, the drilling rig fixing frame includes a fixing frame clamp and a fixing frame waist plate, a clamping groove is opened in the middle of the fixing frame waist plate, the fixing frame clamp is connected to the fixing frame waist plate and cooperates with the clamping groove to clamp and fix the motor drill, and both ends of the fixing frame waist plate are respectively connected to the guide rail sliders.

[0013] The present application also provides a concrete strength detection method, which uses the above concrete strength detection device and includes:

[0014] Controlling the motor drill to drill a concrete test block and obtaining drilling parameters;

[0015] Screening, analyzing and normalizing the drilling parameters;

[0016] A prediction model is established and selected, and the strength of the concrete test block is output according to the prediction model and the normalized drilling parameters.

[0017] The concrete strength detection device and method provided in the present application detects the drilling parameters (torque, rotation speed, drilling pressure, drilling rate) during the drilling process of the drilling rig, and directly uses the drilling parameters of the drilling rig to characterize the concrete mechanical parameters according to the correlation between the drilling parameters and the concrete mechanical parameters (uniaxial compressive strength, Poisson's ratio, internal friction angle, elastic modulus) and characteristics (aggregate particle size, coagulation and hardening integrity coefficient). The device and method have the advantages of being intuitive, efficient, and able to make real-time judgments on site. The motor drill is slidably connected to the guide rail mechanism to control the loading pressure, i.e., the drilling pressure, to the motor drill, and the monitoring control system is used to monitor the moving speed, rotation speed, and torque of the motor drill when drilling concrete test blocks, so that the detection is convenient and quick. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0019] Figure 1 A structural diagram of a concrete strength detection device provided in an embodiment of the present application;

[0020] Figure 2 It is the assembly drawing of the motor drill and the drilling pressure configuration frame;

[0021] Figure 3 This is the assembly drawing of the motor drill and the drill mounting bracket;

[0022] Figure 4 This is a flow chart of the concrete strength detection method provided in an embodiment of the present application.

[0023] in:

[0024] 1-left guide rail, 2-top frame, 3-right guide rail, 4-column, 5-motor drill, 6-motor interface, 7-fixed frame clamp, 8-fastening bolts, 9-drill rod, 10-connecting angle code, 11-fixing mechanism, 12-concrete test block, 13-drill chuck connecting shaft, 14-fixed frame waist plate, 15-guide rail slider, 16-force transmission angle steel, 17-drill pressure configuration frame, 18-bottom frame. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0026] In order to enable those skilled in the art to better understand the present application, the present application is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0027] Please refer to Figures 1 to 3 , Figure 1 This is a structural diagram of the concrete strength detection device provided in the embodiment of the present application. Figure 2 This is the assembly drawing of the motor drill and the drilling pressure configuration frame. Figure 3 This is the assembly drawing of the motor drill and the drill mounting bracket.

[0028] The embodiment of the present application provides a concrete strength detection device, which includes an experimental frame, a motor drill 5 and a monitoring control system. A guide rail mechanism is vertically fixed on the experimental frame, and the motor drill 5 can be lifted and slid along the guide rail mechanism. The guide rail mechanism is used for guidance, and the drilling pressure during drilling is adjusted by changing the gravity loaded on the motor drill 5. The monitoring control system is used to control the operation of the motor drill 5 on the one hand, and to monitor and obtain the drilling parameters of the motor drill 5 such as rotation speed, torque and drilling rate on the other hand. By monitoring the drilling parameters of the concrete test block 12 with a preset standard strength, a corresponding relationship model of the drilling parameters-concrete strength is generated, so that when performing concrete strength detection, the concrete test block 12 can be drilled and the drilling parameters can be obtained by using the concrete strength detection device provided by the embodiment of the present application, so that the strength of the concrete test block 12 can be conveniently and accurately determined.

[0029] The experimental frame is connected by profiles, specifically including a top frame 2, a bottom frame 18 and a column 4. The top frame 2 and the bottom frame 18 are connected by cross beams to form a square frame, and the column 4 is vertically connected at the four corners of the top frame 2 and the bottom frame 18. The guide rail mechanism includes a pair of oppositely arranged left guide rails 1 and right guide rails 3. In order to facilitate the installation and fixation of the left guide rails 1 and the right guide rails 3, a pair of columns 4 are also connected between the bottom frame 18 and the bottom frame 18. The column 4 is connected between the middle of the cross beams of the top frame 2 and the bottom frame 18, and the left guide rail 1 and the right guide rail 3 are respectively fixed on the column 4. The motor drill 5 is fixed by a drill fixing frame, and the two ends of the drill fixing frame are fixedly connected to the guide rail sliders 15, and the guide rail sliders 15 are respectively slidably connected to the left guide rail 1 and the right guide rail 3.

[0030] refer to Figure 2 and Figure 3 The drill rig fixing frame includes a fixing frame clamping plate 7 and a fixing frame waist plate 14. The two ends of the fixing frame waist plate 14 are respectively connected to the guide rail slider 15 by bolts. A clamping groove for accommodating the motor drill 5 is provided in the middle of the fixing waist plate. The size of the clamping groove is slightly larger than the diameter of the drill chuck connecting shaft 13 of the motor drill 5. Screw holes are provided in the bottom of the clamping groove and the fixing frame clamping plate 7. By tightening the fastening bolts 8, the fixing frame clamping plate 7 cooperates with the clamping groove to clamp and fix the motor drill 5.

[0031] In one embodiment, the left guide rail 1 and the right guide rail 3 both adopt dual-axis linear guides, and the corresponding guide rail slider 15 adopts a four-wheel locking slider that cooperates with the dual-axis linear guide. The four-wheel locking slider is provided with a locking bolt. When the locking bolt is tightened, the four-wheel locking slider is relatively locked with the dual-axis linear guide to prevent the motor drill 5 from sliding down due to its own gravity in the non-drilling detection state; when the locking bolt is not tightened, the four-wheel locking slider can be lifted and lowered relative to the dual-axis linear guide, which is convenient for adjusting the gravity loaded on the motor drill 5 and changing the drilling pressure of the motor drill 5 during drilling detection of the concrete test block 12.

[0032] In the above embodiment, the motor drill 5 includes a drill body and a hydraulic motor for driving the drill to rotate. The hydraulic motor is provided with a motor interface 6. The motor interface 6 is used to pass a fluid with a preset pressure and flow rate to drive the hydraulic motor to rotate. The hydraulic motor drives the drill chuck connecting shaft 13 of the drill body and the drill rod 9 to rotate to realize drilling detection. In order to obtain the drilling parameters, the monitoring and control system at least includes a control center, a first monitoring module for monitoring the flow rate and the inlet and outlet fluid pressure difference of the hydraulic motor, and a laser displacement sensor for monitoring the lifting displacement of the hydraulic motor, i.e., the motor drill 5. The laser displacement sensor is fixed on the top of the experimental frame. The first monitoring module includes a flow meter and two groups of pressure gauges or a group of differential pressure transmitters. The first monitoring module and the laser displacement sensor are both connected to the control center so that the control center can output the drilling parameters such as the rotation speed, torque and drilling rate of the motor drill 5.

[0033] refer to Figure 1 and Figure 2 In one embodiment, the concrete strength detection device further includes a drilling pressure configuration frame for carrying a counterweight. The drilling pressure configuration frame is arranged on the top of the motor drill 5 and is fixed to the fixed frame waist plate 14 through a pair of force transmission angle steels 16 to achieve the transmission of drilling pressure. The drilling pressure is adjusted by counterweighting or loading different gravity to the drilling pressure configuration frame 17. The monitoring and control system further includes a pressure sensor for detecting the pressure applied by the drill rod 9. The pressure sensor can be arranged between the drill chuck connecting shaft 13 and the drill rod 9. The pressure sensor is also connected to the central control center to monitor the output drilling pressure parameters.

[0034] At the same time, in order to ensure the overall strength of the experimental frame, connecting angle codes 10 are provided at the connection points between the upright column 4 and the cross beam of the top frame 2, and at the connection points between the upright column 4 and the cross beam of the bottom frame 18. With the help of the connecting angle codes 10, the verticality of the connection between the upright column 4 and the top frame 2 and the bottom frame 18 is improved to prevent the experimental frame from being deformed when the motor drill clamp is loaded with heavy objects.

[0035] In one embodiment, the concrete strength detection device provided by the present application further includes a fixing mechanism 11 disposed on the bottom frame 18, such as Figure 1 The fixing mechanism 11 is fixed to the center of a pair of parallel and opposite beams of the bottom frame 18. The fixing mechanism 11 includes a fixing part and an adjusting bolt. The adjusting bolt is rotatably connected to the fixing part. By rotating the adjusting bolt, the concrete test block 12 is clamped to the bottom of the experimental frame. The concrete strength testing device provided by the present application can not only directly test the strength of concrete or rock formation ground, but also clamp the sampled test block to the bottom of the experimental frame by using the fixing mechanism 11, and realize strength testing by drilling the sampled test block.

[0036] refer to Figure 4 The present application also provides a concrete strength detection method, which uses the above concrete strength detection device and includes:

[0037] Step 1: sample data collection, that is, driving the motor drill 5 to drill a hole in the concrete test block 12 and obtaining drilling parameters;

[0038] Step 2: Sample data processing, i.e. screening, analysis and normalization of the drilling parameters;

[0039] Step 3: Establish and select a prediction model, and output concrete strength based on the prediction model and normalized drilling parameters.

[0040] Specifically, step 1, sample data collection includes: moving the concrete test block 12 to the test position of the test frame, adjusting the fixing mechanism 11 to fix the concrete test block 12 to be tested, and moving the concrete test block 12 to be tested left and right to adjust its mark point to be located directly below the drill rod 9 of the motor drill 5. The monitoring and control system is used to control the hydraulic test bench to adjust the fluid flow and pressure of the hydraulic motor, increase or decrease the weight of the drilling pressure configuration frame, and adjust to appropriate drilling control parameters according to different test objects to ensure that the motor drill 5 can drill into the test object. The laser displacement sensor is placed directly above the experimental frame, with the light spot facing the unobstructed left side of the fixed frame waist plate 14. The motor drill 5 is started, and the drill rod 9 gradually drills into the concrete. The drilling displacement is monitored in real time by the laser displacement sensor, and the motor flow and pressure difference can be directly obtained through the first monitoring module.

[0041] Step 2 includes: sample data preprocessing, substituting the flow rate and pressure difference of the hydraulic motor collected in step 1 into the conversion formula to obtain the drilling parameters torque and speed, and obtaining the drilling rate through the drilling displacement monitored in real time by the laser displacement sensor. In order to eliminate the influence of the order of magnitude, outliers and trends are deleted, principal component analysis is performed, stepwise regression sequence features and regularization are selected, missing data are filled, and the four drilling parameters (torque, speed, drilling pressure, drilling rate) in the sample database are normalized to [0-1] values. Similarly, the corresponding concrete test block 12 strength data is normalized to [0-1].

[0042] Step 3 includes: determining the optimal prediction model and parameters, dividing the collected sample database into a training set and a test set at a ratio of 80% and 20%, establishing a prediction model through the training set, using the drilling parameters of the test set as the input of the prediction model, and the strength of the concrete test block 12 as the output of the prediction model.

[0043] The prediction model and expert knowledge system are a detection system based on the corresponding relationship between drilling parameters and concrete strength, which is established by integrating the best of machine learning training (including BP neural network, RBF nonlinear regression prediction, SVM support vector machine nonlinear regression prediction, Lunar neural network app software testing, AMESim neural network app software testing, etc.) through a large amount of data and experience in the laboratory. Finally, by inputting the drilling parameters of the concrete test block 12 to be tested, the strength of the concrete test block 12 is output according to the selected optimal prediction model and drilling parameters.

[0044] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0045] The above is a detailed introduction to the concrete strength detection device and method provided by the present application. This article uses specific examples to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method and its core idea of ​​the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A concrete strength detection method, applied to a concrete strength detection device, the concrete strength detection device comprising an experimental frame, a guide rail mechanism fixedly connected to the experimental frame and vertically arranged, a motor drill rig slidably connected to the guide rail mechanism, and a monitoring and control system for monitoring the drilling parameters of the motor drill rig and controlling the motor drill rig; the motor drill rig comprises a drill rig body and a hydraulic motor for driving the drill rig body to rotate, the hydraulic motor is provided with a motor interface, the motor interface is used to pass a fluid with a preset pressure and flow rate to drive the hydraulic motor to rotate, the hydraulic motor drives the drill chuck connecting shaft and the drill rod of the drill rig body to rotate to achieve drilling, and the monitoring and control system comprises a monitoring system for monitoring the hydraulic motor The first monitoring module for flow and pressure difference, and a laser displacement sensor arranged on the experimental frame and used to monitor the lifting displacement of the motor drill, the first monitoring module and the laser displacement sensor are both connected to the control center so that the control center can output the rotation speed, torque and drilling rate of the motor drill; it also includes a drilling pressure configuration frame for carrying a counterweight, the drilling pressure configuration frame is arranged on the top of the motor drill and is fixedly connected to the motor drill; the drilling pressure is adjusted by counterweighting or loading different gravity on the drilling pressure configuration frame; the monitoring and control system also includes a pressure sensor for detecting the pressure applied by the drill rod, the pressure sensor is arranged between the drill chuck connecting shaft and the drill rod, and the pressure sensor is connected to the control center; It is characterized in that The steps of the concrete strength detection method include: Controlling the motor drill to drill a concrete test block and obtaining drilling parameters; The drilling parameters are screened, analyzed and normalized, including substituting the collected flow rate and pressure difference of the hydraulic motor into the conversion formula to obtain the drilling parameters torque and speed, obtaining the drilling rate through the drilling displacement monitored in real time by the laser displacement sensor, deleting abnormal values ​​and trends, performing principal component analysis, selecting stepwise regression sequence features and regularization, filling missing data processing, and normalizing the torque, speed, drilling pressure and drilling rate in the sample database to [0-1] values, and normalizing the concrete test block strength data to [0-1]; A prediction model is established and selected, and the strength of the concrete test block is output according to the prediction model and the normalized drilling parameters, which includes dividing the collected sample database into a training set and a test set at a ratio of 80% and 20%, establishing a prediction model through the training set, using the drilling parameters of the test set as the input of the prediction model, and the strength of the concrete test block as the output of the prediction model; wherein the prediction model and expert knowledge system are detection systems based on the correspondence between drilling parameters and concrete strength established through machine learning training and preferential integration of a large amount of data and experience in the laboratory, and by inputting the drilling parameters of the concrete test block to be tested, the strength of the concrete test block is output according to the selected prediction model and drilling parameters.

2. The concrete strength detection method according to claim 1, characterized in that: The experimental frame comprises a top frame, a bottom frame and a plurality of groups of columns connecting the top frame and the bottom frame, and the cross beams of the bottom frame are arranged opposite to each other to form a fixing mechanism for clamping a concrete test block.

3. The concrete strength detection method according to claim 2, characterized in that: The guide rail mechanism comprises a left guide rail and a right guide rail which are arranged in parallel and opposite to each other. The motor drill is connected to a drill fixing frame. Both ends of the drill fixing frame are respectively provided with guide rail sliders which cooperate with the left guide rail and the right guide rail.

4. The concrete strength detection method according to claim 3, characterized in that: The left guide rail and the right guide rail are both dual-axis linear guide rails, and the guide rail sliders are four-wheel locking sliders, and the four-wheel locking sliders are provided with locking bolts.

5. The concrete strength detection method according to claim 2, characterized in that: The columns and the cross beams of the top frame as well as the columns and the cross beams of the bottom frame are all provided with connection angle brackets.

6. The concrete strength detection method according to claim 3, characterized in that: The drilling rig fixing frame includes a fixing frame clamping plate and a fixing frame waist plate. A clamping groove is arranged in the middle of the fixing frame waist plate. The fixing frame clamping plate is connected to the fixing frame waist plate and cooperates with the clamping groove to clamp and fix the motor drilling rig. Both ends of the fixing frame waist plate are respectively connected to the guide rail sliders.

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