Strength detection equipment adopting actual drilling method, strength detection model establishment method and detection method

Abstract

The invention discloses a real drilling method strength detection device, a strength measurement model establishment method and a detection method, and the device comprises a housing assembly which is used as a structure support; the drilling machine assembly comprises a drill bit and a driving mechanism arranged in the shell assembly and used for driving the drill bit to rotate; the constant thrust mechanism is arranged in the shell assembly, connected to the tail end of the drilling machine assembly and used for adjusting the drilling pressure of the drill bit to a preset value; the detection assembly is arranged in the shell assembly and used for detecting the drilling depth of the drill bit and feeding back a drilling depth signal; the data processing system is arranged in the shell assembly, electrically connected with the detection assembly and used for recording the drilling time value of the drill bit, receiving the drilling depth signal fed back by the detection assembly and conducting strength analysis processing according to the drilling depth signal and the drilling time value; and the display module is arranged on the shell assembly, is electrically connected with the data processing system and is used for displaying an intensity analysis processing result of the data processing system.

Description

Technical Field

[0001] The present invention relates to the technical field of concrete strength detection, and in particular to a real drilling strength detection device, a strength measurement model establishment method and a detection method. Background Art

[0002] The existing tunnel secondary lining concrete testing methods are mainly divided into two types: non-destructive testing methods and destructive testing methods. Among them, ultrasonic testing method, geological radar testing method, and rebound method belong to non-destructive testing methods; core drilling method, pull-out method, and shooting method belong to micro-destructive testing methods.

[0003] Ultrasonic detection method and geological radar detection method use sound waves or high-frequency electromagnetic waves to analyze the reflection parameters in different media to detect abnormal geological bodies. The equipment is relatively complex and the cost is high. The rebound method detects the surface hardness of structural concrete. At the same time, the service life of concrete is generally required to be between 28 days and 1000 days, which cannot meet the requirements of aging concrete strength detection. The core drilling method causes damage to the structure, weakens the cross-section of the structure, affects the bearing capacity, and reduces the structural safety reserve. At the same time, the execution process of this method is relatively complicated and is not suitable as a means of rapid on-site detection. The pull-out method is a test method that uses special tools to pull out the anchor that has been placed in the concrete to determine the compressive strength of concrete. It also causes a certain degree of damage to the structure, and the operation process is relatively complicated, which cannot meet the needs of rapid detection. In addition to safety issues, the shooting method is greatly affected by factors such as gunpowder, the quality of bolt parts and coarse aggregate in the concrete surface. The detection accuracy is difficult to guarantee and the discreteness of the obtained detection data is relatively large. Therefore, the nail shooting method is rarely formally used in engineering. Summary of the invention

[0004] The present invention provides a real drilling strength detection device, a strength measurement model establishment method and a detection method, so as to solve the technical problems of complex detection operation and low detection accuracy of concrete detection technology in the prior art.

[0005] According to one aspect of the present invention, there is provided a real drilling strength detection device, comprising:

[0006] A shell assembly for structural support;

[0007] A drilling machine assembly, comprising a drill bit and a driving mechanism disposed in a housing assembly for driving the drill bit to rotate;

[0008] A constant thrust mechanism, disposed in the housing assembly and connected to the rear end of the drilling rig assembly, for adjusting the drilling pressure of the drill bit to a preset value;

[0009] A detection component, disposed in the housing component, for detecting the drilling depth of the drill bit and feeding back a drilling depth signal;

[0010] A data processing system is disposed in the housing assembly and electrically connected to the detection assembly, and is used to record the drilling time value of the drill bit, receive the drilling depth signal fed back by the detection assembly, and perform strength analysis processing according to the drilling depth signal and the drilling time value;

[0011] The display module is arranged in the housing assembly and is electrically connected to the data processing system, and is used to display the strength analysis processing result of the data processing system.

[0012] As a further improvement of the above technical solution, the constant thrust mechanism includes a positive and negative stiffness spring assembly arranged in the housing assembly and connected to the drilling rig assembly, a pressure regulating component arranged in the housing assembly and connected to the positive and negative stiffness spring assembly, and an identification portion for indicating the drilling pressure that matches the pressure regulating component and is arranged on the housing assembly. The pressure regulating component is used to adjust the compression amount of the positive and negative stiffness spring assembly and thereby adjust the drilling pressure of the drill bit.

[0013] As a further improvement of the above technical solution, the positive and negative stiffness spring assembly includes a bracket, an output shaft connected to the rear end of the drilling assembly, a main spring sleeved on the output shaft, a rolling element connected to one side of the main shaft, a knife cam rotatably connected to the bracket for cooperating with the rolling element, and an auxiliary spring respectively connected to the bracket and the knife cam. A plurality of the rolling elements are symmetrically distributed on the device, the cam surface of the knife cam is arranged toward the rolling element, and the auxiliary spring is arranged in a compressed state on a side of the knife cam away from the cam surface.

[0014] As a further improvement of the above technical solution, a sliding rod is provided in the housing assembly, and the driving mechanism is slidably connected to the sliding rod via an oil-free copper sleeve.

[0015] As a further improvement of the above technical solution, the drilling diameter of the drilling rig assembly is 18 mm, and the drilling depth is preset to 70 mm.

[0016] According to another aspect of the present invention, a strength measurement model establishment method is also provided, which is applied to the above-mentioned real drilling strength detection device, and the strength measurement model establishment method comprises:

[0017] A1. Determine the drill rod and constant thrust, and integrate the standard concrete strength model obtained under laboratory conditions into the data processing system;

[0018] A2. Adjust the constant thrust to the preset value;

[0019] A3. Perform a drilling test under laboratory conditions, place the drill bit against the test area of ​​standard concrete, and start drilling with the drilling rig assembly;

[0020] A4. When the detection component detects that the drilling depth reaches the preset value, the drilling is stopped and the data processing system records the drilling time value;

[0021] A5. Repeat steps A3 to A4 to obtain the drilling time values ​​of multiple measuring points in the test area, and take the average value as the drilling time value of the standard concrete;

[0022] A6. Repeat step A5 to obtain the drilling time values ​​of standard concrete with different strengths, fit the fitting relationship between concrete drillability and strength based on the relationship between the drilling time value and strength of standard concrete obtained under laboratory conditions, and establish a similar mathematical model as a strength measurement model.

[0023] As a further improvement of the above technical solution, step A5 also includes: excluding singular values ​​in the drilling time values.

[0024] As a further improvement of the above technical solution, before performing step A3, the carbonization depth is measured using a 1% phenolphthalein alcohol solution, and the carbonized layer on the surface of the test area is removed according to the measured carbonization depth, or the drill bit is drilled to the average carbonization depth before starting the test.

[0025] As a further improvement of the above technical solution, step A1 includes:

[0026] A11. Fixed constant thrust, drilling depth, and standard concrete specimen strength;

[0027] A12. Change the drill bit size to conduct drilling test and obtain the drilling time value;

[0028] A13. According to the relationship between drill bit size and drilling time, select the drill bit size;

[0029] A14. According to the selected drill bit size, fix the drilling depth and standard concrete sample strength;

[0030] A15. Adjust the constant thrust to conduct drilling test and obtain the drilling time value;

[0031] A16. According to the relationship between drill bit size and drilling time, select the constant thrust size.

[0032] According to another aspect of the present invention, a real drilling strength detection method is also provided, which is applied to the real drilling strength detection device described above, and the detection method comprises:

[0033] S1. Displacement zeroing;

[0034] S2. Adjust the constant thrust to the preset value;

[0035] S3. The drill head is placed against the surface to be tested, and the drilling rig assembly is turned on to start drilling;

[0036] S4. When the detection component detects that the drilling depth reaches a preset value, the drilling is stopped and the data processing system records the drilling time value;

[0037] S5. The data processing system obtains the detection intensity value according to the drilling depth signal fed back by the detection component and the recorded drilling time value;

[0038] S6. Change the measuring point, repeat steps S2 to S5, obtain the detection intensity values ​​of multiple measuring points and iteratively calculate to obtain the comprehensive intensity value.

[0039] The present invention has the following beneficial effects:

[0040] The detection equipment is provided with a constant thrust mechanism to adjust the drilling pressure of the drilling rig component and keep the drilling pressure of the drilling rig component constant during the test. The drilling rig component tests the strength of the concrete to be tested, the driving mechanism drives the drill bit to rotate, and the constant thrust mechanism applies a constant thrust to the rear end of the drilling rig component to act on the detection point with a constant drilling pressure. The detection component detects the drilling depth of the drill bit, and the data processing system records the drilling time value of drilling to the preset depth according to the drill bit start-up time and the drilling depth signal fed back by the detection component after the drill bit reaches the preset drilling depth. Under the condition that the drilling pressure, rotation speed and drill rod diameter are certain values, the data processing system can characterize the strength of the concrete by the drilling time value. The data processing system is pre-integrated with a similar mathematical model formed by fitting the relationship between the standard concrete and the drilling time value under laboratory conditions. The drilling time value obtained in the actual test is substituted into the model to obtain the corresponding concrete strength and feedback to the display module for display. The detection equipment has a simple structure and is easy to operate, and can realize rapid on-site detection.

[0041] In addition to the above-described purposes, features and advantages, the present invention has other purposes, features and advantages. The present invention will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] The drawings constituting a part of this application are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0043] Figure 1 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 1 ;

[0044] Figure 2 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 2 ;

[0045] Figure 3 It is a schematic diagram of the structure of a pressure regulating member in a preferred embodiment of the present invention;

[0046] Figure 4It is a schematic diagram of the internal structure of the constant thrust mechanism of a preferred embodiment of the present invention;

[0047] Figure 5 This is a working principle diagram of the constant thrust mechanism of the preferred embodiment of the present invention;

[0048] Figure 6 It is a schematic diagram of the drill bit drilling into the rock.

[0049] Legend:

[0050] 1. Pressure regulating part; 2. Force applying handle; 3. Display module; 4. Slide bar; 5. Constant thrust mechanism; 51. Output shaft; 52. Rolling element; 53. Auxiliary spring; 54. Knife cam; 55. Main spring; 6. Housing assembly; 7. Detection assembly; 8. Reflector; 9. Concrete specimen; 10. Drill bit; 11. Drill chuck; 12. Drilling machine assembly; 13. Oil-free copper sleeve; 14. Housing assembly; 15. Identification part. DETAILED DESCRIPTION

[0051] The embodiments of the present invention are described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0052] Figure 1 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 1 ; Figure 2 The structure of the preferred embodiment of the present invention is shown in FIG. Figure 2 ; Figure 3 It is a schematic diagram of the structure of a pressure regulating member in a preferred embodiment of the present invention; Figure 4 It is a schematic diagram of the internal structure of the constant thrust mechanism of a preferred embodiment of the present invention; Figure 5 This is a working principle diagram of the constant thrust mechanism of the preferred embodiment of the present invention; Figure 6 It is a schematic diagram of the drill bit drilling into the rock.

[0053] like Figures 1 to 4 As shown, the real drilling strength detection equipment of this embodiment includes:

[0054] A housing assembly 146 for structural support;

[0055] The drill assembly 12 includes a drill bit 10 and a driving mechanism disposed in a housing assembly 146 for driving the drill bit 10 to rotate;

[0056] The constant thrust mechanism 5 is disposed in the housing assembly 146 and connected to the rear end of the drilling assembly 12, and is used to adjust the drilling pressure of the drill bit 10 to a preset value;

[0057] The detection component 7 is disposed in the housing component 146 and is used to detect the drilling depth of the drill bit 10 and feed back a drilling depth signal;

[0058] A data processing system is disposed in the housing assembly 146 and is electrically connected to the detection assembly 7, and is used to record the drilling time value of the drill bit 10, receive the drilling depth signal fed back by the detection assembly 7, and perform strength analysis processing according to the drilling depth signal and the drilling time value;

[0059] The display module 3 is disposed in the housing assembly 146 and is electrically connected to the data processing system, and is used to display the strength analysis processing result of the data processing system.

[0060] The driving mechanism works at a constant power (i.e., keeps the rotation speed of the drill bit 10 constant), and adopts a drilling machine of the prior art; the display module 3 is implemented by a touch screen of the prior art; the data processing system is implemented based on a PLC single chip microcomputer of the prior art; the detection component 7 includes a laser displacement sensor of the prior art, and a reflector 8 is provided corresponding to the detection surface to cooperate in realizing displacement detection. In other embodiments, the implementation method of the detection component 7 is not limited;

[0061] It can be understood that the detection equipment is provided with a constant thrust mechanism 5 to adjust the drilling pressure of the drilling assembly 12 and keep the drilling pressure of the drilling assembly 12 constant during the test. The drilling assembly 12 tests the strength of the concrete to be tested, the driving mechanism drives the drill bit 10 to rotate, and the constant thrust mechanism 5 applies a constant thrust to the rear end of the drilling assembly 12 to act on the detection point with a constant drilling pressure. The detection assembly 7 detects the drilling depth of the drill bit 10, and the data processing system detects the drilling depth signal fed back by the detection assembly 7 according to the start time of the drill bit 10 and the drilling depth reached by the drill bit 10. The drilling time value of drilling to the preset depth is recorded. Under the condition that the drilling pressure, rotation speed and drill rod diameter are certain values, the data processing system can use the drilling time value to characterize the strength of the concrete. The data processing system pre-integrates a similar mathematical model formed by fitting the relationship between the standard concrete and the drilling time value under laboratory conditions. The drilling time value obtained in the actual test is substituted into the model to obtain the corresponding concrete strength and feed it back to the display module 3 for display. The detection equipment can test the strength of concrete of any service time, has a simple structure, is easy to operate, and can realize rapid on-site detection.

[0062] In this embodiment, the constant thrust mechanism 5 includes a positive and negative stiffness spring assembly arranged in the housing assembly 146 and connected to the drilling rig assembly 12, a pressure regulating member 1 arranged in the housing assembly 146 and connected to the positive and negative stiffness spring assembly, and an identification portion 15 for indicating the drilling pressure size and matching the pressure regulating member 1 and arranged in the housing assembly 146. The pressure regulating member 1 is used to adjust the compression amount of the positive and negative stiffness spring assembly and thus adjust the drilling pressure of the drill bit 10, wherein the pressure regulating member 1 adjusts the axial position of the positive and negative stiffness spring assembly in the housing assembly 146, and then before the test, when the drill bit 10 is pressed against the test surface to compress the positive and negative stiffness spring assembly, the compression amount is changed to achieve the purpose of changing the drilling pressure size; by matching the identification portion 15, when the pressure regulating member 1 is located at different positions, it matches and indicates the drilling pressure size provided by the constant thrust mechanism 5 at the position, which is simple to operate, easy to use, and has strong stability;

[0063] Specifically, the pressure regulating member 1 is a pressure regulating knob, and a rolling groove cooperating with the pressure regulating knob is provided on the outer wall of the housing assembly 146 along the axial direction, and the marking portion 15 is a scale line arranged on one side of the rolling groove; the axial position of the positive and negative stiffness spring assembly can be changed by rotating the pressure regulating knob to move it along the rolling groove;

[0064] Furthermore, the positive and negative stiffness spring assembly includes a bracket, an output shaft 51 connected to the rear end of the drilling assembly 12, a main spring 55 sleeved on the output shaft 51, a rolling element 52 connected to one side of the main shaft, a knife cam 54 rotatably connected to the bracket for cooperating with the rolling element 52, and an auxiliary spring 53 respectively connected to the bracket and the knife cam 54. A plurality of rolling elements 52 are symmetrically distributed on the main shaft, the cam surface of the knife cam 54 is arranged toward the rolling element 52, and the hinge point is located at one end of the knife cam 54. The auxiliary spring 53 is arranged in a compressed state on the side of the knife cam 54 away from the cam surface. Figure 5 , Figure 5The middle displacement direction indicates the displacement direction of the drill bit 10 retracting into the housing assembly 146 rather than the extension direction. It should be understood that the force of the main spring 55 acting on the main shaft gradually decreases as the drill bit 10 increases. By setting the auxiliary spring 53 and the knife cam 54, during the extension of the drill bit 10, the rolling element 52 cooperates with the cam surface and moves along the cam surface. Before the drill bit 10 is extended to the preset position, the auxiliary spring 53 acts on the rolling element 52 through the cam surface of the knife cam 54. At this time, the cam surface tends to be in the opposite direction of the extension of the drill rod. At this time, the elastic potential energy of the main spring 55 is relatively large, which is neutralized by the auxiliary spring 53. In the process of moving to the preset position, the rolling element 52 cooperates with the cam surface, and the elastic potential energy of the main spring 55 decays. Although the rolling element 52 and the cam surface cooperate to further compress the auxiliary spring 53 as the drill bit 10 is extended, the cooperation angle between the cam surface and the rolling element 52 gradually changes. The axial component of the spring 53 on the output shaft 51 is gradually reduced, so that the combined force of the auxiliary spring 53 and the main spring 55 remains constant. When the output shaft 51 drives the drill assembly 12 to extend and move to the preset position, the cam surface tends to the extension direction of the drill rod, and the auxiliary spring 53 is used to compensate for the elastic force of the main spring 55. At this time, the elastic force of the main spring 55 decays, and as the drill bit 10 extends, the matching angle between the knife cam 54 and the rolling element 52 gradually changes, so that the combined force of the auxiliary spring 53 and the main spring 55 remains constant. Therefore, based on this structure and after matching the cam surface of the knife cam 54, the combined force of the auxiliary spring 53 and the main spring 55 on the main shaft can be kept constant under any displacement of the drill bit 10 within the drilling range, thereby ensuring constant drilling pressure. The constant thrust mechanism 5 of the detection device realizes drilling pressure adjustment and constant force maintenance through a purely mechanical structure, without the need for force sensor monitoring, and has strong stability.

[0065] In this embodiment, the drilling diameter of the drilling assembly 12 is 18 mm, which is a preferred value obtained based on computer simulation calculation optimization. The damage to the concrete member or wall surface is minor, does not weaken the cross section of the structure, and does not affect the structural bearing capacity. Similarly, the drilling depth is preset to 70 mm.

[0066] In this embodiment, the drill bit 10 is connected to the drill rig assembly 12 through the drill chuck 11, a slide rod 4 is arranged in the housing assembly 146, the driving mechanism is slidably connected to the slide rod 4 through an oil-free copper sleeve 13, and at least two slide rods 4 are symmetrically distributed in the housing assembly 146; wherein, the bracket of the positive and negative stiffness spring assembly is also slidably connected to the slide rod 4 through the oil-free copper sleeve 13.

[0067] In this embodiment, a force-applying handle 2 is provided on the housing assembly 146 so that the tester can be pushed by hand before testing so that the drill bit 10 can be pressed against the test surface and pressed into the instrument to compress the positive and negative stiffness spring assemblies.

[0068] This embodiment also provides a method for establishing a strength measurement model, which is applied to the above-mentioned real drilling strength detection device. The method for establishing a strength measurement model includes:

[0069] A1. Determine the drill rod and constant thrust, and integrate the standard concrete strength model obtained under laboratory conditions into the data processing system;

[0070] A2. Adjust the constant thrust to the preset value; for example, adjust the spring constant force to 150N by adjusting the knob, so that when the handheld device applies thrust, the constant thrust applied to the drilling rig through the constant thrust mechanism is always 150N;

[0071] A3. Perform a drilling test under laboratory conditions, place the drill bit against the test area of ​​standard concrete, and start the drilling rig assembly to drill; wherein the laboratory conditions are determined based on the concrete test experimental requirements in the prior art;

[0072] A4. When the detection component detects that the drilling depth reaches the preset value, the drilling is stopped and the data processing system records the drilling time value;

[0073] A5. Repeat steps A3 to A4 to obtain the drilling time values ​​of multiple measuring points in the test area, and take the average value as the drilling time value of the standard concrete;

[0074] A6. Repeat step A5 to obtain the drilling time values ​​of standard concrete with different strengths, fit the fitting relationship between concrete drillability and strength based on the relationship between the drilling time value and strength of standard concrete obtained under laboratory conditions, and establish a similar mathematical model as a strength measurement model.

[0075] It should be noted that the reference Figure 6 The rock breaking power consumption is the energy consumed by drilling a unit volume of rock mass. The rock mass volume (crushing pit) is regarded as a triangular cone for easy calculation. D is the diameter of the crushing pit. The relationship is:

[0076] D=2(r+dtanβ)

[0077]

[0078]

[0079] Where: r is the cutting surface radius; d is the cutting surface diameter; N is the rotation speed; M is the torque; F is the thrust; V is the drilling speed; β is half of the vertex angle of the triangular cone and is a fixed value; it can be seen that when the drilling pressure and drilling rig power (rotation speed) are constant, the drilling speed can reflect the concrete strength.

[0080] This method conducts drilling tests on the strength of concrete of various standard strengths under laboratory conditions, and then tests the drillability (drilling time) of the drill bit on the concrete sample 9 under the action of a specified constant thrust, and compares it with the concrete strength calibrated for this type of sample under laboratory conditions, thereby obtaining the relationship between the drillability and strength of the concrete. This method uses the drill selected before the test to measure the drilling time value of the drill in the selected measurement area on the concrete sample. When the three factors of the drill power (expressed in drill speed), the quality of the drill rod (expressed in the degree of wear of the drill bit), and the diameter of the drill rod are fixed values, the drillability of the concrete mainly depends on the mechanical properties of the concrete. The higher the strength of the concrete, the higher the drilling resistance affected by the concrete resistance or the concrete resistance, and the shorter the drilling time required for the same drilling depth; the lower the strength of the concrete, the smaller the drilling resistance, and the longer the drilling time required for the same drilling depth. The length of time can be directly used as an indicator to measure the strength of the concrete;

[0081] The relationship between the drillability and strength of concrete is obtained through experiments, and based on this, a similar mathematical model is established and integrated into the data processing system. In actual testing, only the drilling speed (drilling time) to reach the preset depth is used as the concrete strength grading indicator, and the corresponding concrete strength grade can be determined by matching it to the model.

[0082] Furthermore, step A5 also includes: eliminating singular values ​​in the drilling time value to avoid the influence of obvious abnormal factors;

[0083] In this embodiment, before performing step A3, the carbonization depth is measured using a 1% phenolphthalein alcohol solution, and the carbonized layer on the surface of the test area is removed according to the measured carbonization depth, or the drill is drilled to the average carbonization depth before starting the test to ensure data accuracy.

[0084] In this embodiment, step A1 includes:

[0085] A11. Fixed constant thrust, drilling depth, and standard concrete specimen strength;

[0086] A12. Change the drill bit size to conduct drilling test and obtain the drilling time value;

[0087] A13. According to the relationship between drill bit size and drilling time, select the drill bit size;

[0088] A14. According to the selected drill bit size, fix the drilling depth and standard concrete sample strength;

[0089] A15. Adjust the constant thrust to conduct drilling test and obtain the drilling time value;

[0090] A16. According to the relationship between drill bit size and drilling time, select the constant thrust size.

[0091] On the other hand, this embodiment provides a real drilling strength detection method, which is applied to the real drilling strength detection device mentioned above. The detection method includes:

[0092] S1. Displacement zeroing;

[0093] S2. Adjust the constant thrust to the preset value;

[0094] S3. The drill head is placed against the surface to be tested, and the drilling rig assembly is turned on to start drilling;

[0095] S4. When the detection component detects that the drilling depth reaches a preset value, the drilling is stopped and the data processing system records the drilling time value;

[0096] S5. The data processing system obtains the detection strength value according to the drilling depth signal fed back by the detection component and the recorded drilling time value; specifically, the recorded drilling time value is substituted into the aforementioned strength measurement model to obtain the corresponding concrete strength grade;

[0097] S6. Change the measuring point, repeat steps S2 to S5, obtain the detection intensity values ​​of multiple measuring points and iteratively calculate to obtain the comprehensive intensity value; wherein the comprehensive intensity value is displayed and fed back via the display module.

[0098] This testing method tests the concrete strength by applying a constant thrust of the testing equipment to the drilling rig for actual drilling testing. It is simple to operate and has high testing efficiency.

[0099] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A real drilling strength testing device, characterized in that: include: A housing assembly (14) (6) for structural support; A drilling machine assembly (12) includes a drill bit (10) and a driving mechanism disposed in a housing assembly (14) (6) for driving the drill bit (10) to rotate; A constant thrust mechanism (5), arranged in the housing assembly (14) (6) and connected to the rear end of the drilling rig assembly (12), for adjusting the drilling pressure of the drill bit (10) to a preset value; A detection component (7) is arranged in the housing component (14) (6) and is used to detect the drilling depth of the drill bit (10) and feed back a drilling depth signal; A data processing system is arranged in the housing component (14) (6) and is electrically connected to the detection component (7), and is used to record the drilling time value of the drill bit (10), receive the drilling depth signal fed back by the detection component (7), and perform strength analysis processing according to the drilling depth signal and the drilling time value; The display module (3) is arranged in the housing assembly (14) (6) and is electrically connected to the data processing system, and is used to display the strength analysis processing results of the data processing system.

2. The real drilling strength testing equipment according to claim 1, characterized in that: The constant thrust mechanism (5) comprises a positive and negative stiffness spring assembly arranged in the housing assembly (14) (6) and connected to the drilling rig assembly (12), a pressure regulating component (1) arranged in the housing assembly (14) (6) and connected to the positive and negative stiffness spring assembly, and an identification portion (15) for indicating the drilling pressure and arranged on the housing assembly (14) (6) to match the pressure regulating component (1), wherein the pressure regulating component (1) is used to adjust the compression amount of the positive and negative stiffness spring assembly and thereby adjust the drilling pressure of the drill bit (10).

3. The real drilling strength testing equipment according to claim 2, characterized in that: The positive and negative stiffness spring assembly comprises a bracket, an output shaft (51) connected to the rear end of the drilling assembly (12), a main spring (55) sleeved on the output shaft (51), a rolling element (52) connected to one side of the main shaft, a knife cam (54) rotatably connected to the bracket for cooperating with the rolling element (52), and an auxiliary spring (53) respectively connected to the bracket and the knife cam (54), wherein a plurality of the rolling elements (52) are symmetrically distributed on the device, a cam surface of the knife cam (54) is arranged toward the rolling element (52), and the auxiliary spring (53) is arranged in a compressed state on a side of the knife cam (54) away from the cam surface.

4. The real drilling strength testing equipment according to claim 1, characterized in that: A sliding rod (4) is arranged inside the housing assembly (14) (6), and the driving mechanism is slidably connected to the sliding rod (4) via an oil-free copper sleeve (13).

5. The real drilling strength testing equipment according to claim 1, characterized in that: The drilling diameter of the drilling machine assembly (12) is 18 mm, and the drilling depth is preset to 70 mm.

6. A method for establishing a strength measurement model, characterized in that: Applicable to the real drilling strength detection equipment according to any one of claims 1 to 5, the strength measurement model establishment method comprises: A1. Determine the drill rod and constant thrust, and integrate the standard concrete strength model obtained under laboratory conditions into the data processing system; A2. Adjust the constant thrust to the preset value; A3. Perform a drilling test under laboratory conditions, place the drill bit against the test area of ​​standard concrete, and start drilling with the drilling rig assembly; A4. When the detection component detects that the drilling depth reaches the preset value, the drilling is stopped and the data processing system records the drilling time value; A5. Repeat steps A3 to A4 to obtain the drilling time values ​​of multiple measuring points in the test area, and take the average value as the drilling time value of the standard concrete; A6. Repeat step A5 to obtain the drilling time values ​​of standard concrete with different strengths, fit the fitting relationship between concrete drillability and strength based on the relationship between the drilling time value and strength of standard concrete obtained under laboratory conditions, and establish a similar mathematical model as a strength measurement model.

7. The method for establishing a strength measurement model according to claim 6, characterized in that: Step A5 also includes: eliminating singular values ​​in the drilling time values.

8. The method for establishing a strength measurement model according to claim 6, characterized in that: Before carrying out step A3, the carbonization depth is measured using a 1% phenolphthalein alcohol solution, and the carbonized layer on the surface of the test area is removed according to the measured carbonization depth, or the drill is drilled to the average carbonization depth before starting the test.

9. The method for establishing a strength measurement model according to claim 6, characterized in that: Step A1 includes: A11. Fixed constant thrust, drilling depth, and standard concrete specimen strength; A12. Change the drill bit size to conduct drilling test and obtain the drilling time value; A13. According to the relationship between drill bit size and drilling time, select the drill bit size; A14. According to the selected drill bit size, fix the drilling depth and standard concrete sample strength; A15. Adjust the constant thrust to conduct drilling test and obtain the drilling time value; A16. According to the relationship between drill bit size and drilling time, select the constant thrust size.

10. A real drilling strength detection method, characterized in that: The real drilling strength detection device according to any one of claims 1 to 5, wherein the detection method comprises: S1. Displacement zeroing; S2. Adjust the constant thrust to the preset value; S3. The drill head is placed against the surface to be tested, and the drilling rig assembly is turned on to start drilling; S4. When the detection component detects that the drilling depth reaches a preset value, the drilling is stopped and the data processing system records the drilling time value; S5. The data processing system obtains the detection intensity value according to the drilling depth signal fed back by the detection component and the recorded drilling time value; S6. Change the measuring point, repeat steps S2 to S5, obtain the detection intensity values ​​of multiple measuring points and iteratively calculate to obtain the comprehensive intensity value.

Images