A method and system for controlling anchor pull-out tests

Abstract

This invention relates to a control method and system for anchor bolt pull-out tests. The anchor bolt pull-out test involves multi-stage loading and unloading, belonging to the field of anchor bolt testing technology. The method includes: acquiring test parameters; controlling the oil pump loading flow rate during each loading stage and the oil pump unloading flow rate during each unloading stage of the anchor bolt pull-out test based on the test parameters; and controlling the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test based on the test parameters. This invention precisely controls the oil pump flow rate and pressure during each loading and unloading stage of the pull-out test based on the test parameters, achieving precise speed adjustment of the loading and unloading speeds at each stage. This results in accurate and reliable test results with minimal error, meeting specification requirements. Furthermore, by monitoring the test status, the oil pump is stopped when the test status does not meet preset conditions, ensuring the safety of the test.

Description

Technical Field

[0001] This invention relates to the field of anchor bolt testing technology, and in particular to a method and system for controlling anchor bolt pull-out tests. Background Technology

[0002] An anchor bolt is a tension member that connects to an external load-bearing structure at one end and is anchored to stable soil or rock at the other end, transferring tensile force to the soil or rock mass. Anchor bolt support is a reinforcement and support method used in surface engineering projects such as slopes and deep foundation pits, as well as in underground chamber construction such as tunnels and mining areas. Anchor bolt pull-out tests can be used to determine the ultimate pull-out force of the anchor bolt, provide anchor bolt design parameters and verify anchor bolt construction techniques, and also determine whether the pull-out performance of the anchor bolt meets the design requirements, providing a basis for project acceptance.

[0003] Current anchor bolt pull-out testing often uses a manual pull-out instrument to pull the anchor bolt out, and then measures the displacement of the anchor bolt after pulling out using a dial indicator once the control pressure is reached. The testing process uses a manual oil pump for loading and manually records the displacement gauge readings, which has problems such as inaccurate pressure control, inaccurate loading and unloading rate control, and large errors in displacement readings and time interval control. In addition, this testing process requires operators to be on-site, and if abnormalities such as anchor bolt breakage or oil pump failure occur, it may cause on-site safety accidents, making it difficult to guarantee personal safety. Moreover, the anchor bolt pull-out test involves loading, unloading, displacement reading, and time interval counting, which requires manual operation at regular intervals, resulting in significant manpower consumption.

[0004] Therefore, how to improve the detection accuracy and efficiency in the anchor bolt pull-out detection process is a technical problem that urgently needs to be solved. Summary of the Invention

[0005] In view of this, it is necessary to provide a control method and system for anchor bolt pull-out testing to improve the detection accuracy and efficiency in the anchor bolt pull-out testing process.

[0006] To address the aforementioned problems, this invention provides a method for controlling anchor bolt pull-out tests. The anchor bolt pull-out test comprises multi-stage loading and multi-stage unloading, including:

[0007] Obtain test parameters, and control the oil pump loading flow rate and the oil pump unloading flow rate during each loading and unloading process in the anchor bolt pull-out test based on the test parameters;

[0008] Based on the test parameters, the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test are controlled.

[0009] In one possible implementation, controlling the oil pump loading flow rate during each loading stage and the oil pump unloading flow rate during each unloading stage of the anchor bolt pull-out test based on the test parameters includes:

[0010]

[0011] in, V i加载 For the first i The oil pump loading flow rate of the grade, For the first i The average loading time of the stage, For the first i Real-time loading time at the level V i加载-1 For the first i-1 The oil pump loading flow rate of the grade, V i卸载 For the first i The unloading flow rate of the oil pump is at the level of [level]. For the first i The average unloading time of the stage, For the first i Real-time unloading time at the level V i卸载-1 For the first i-1 The unloading flow rate of the oil pump is at the level of [level]. f This is the proportionality coefficient.

[0012] In one possible implementation, the test parameters include load control values ​​for each level. k i Allowed loadout value g Load allowable overload value d and unload allow overload value e .

[0013] In one possible implementation, controlling the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test based on the test parameters includes:

[0014] The oil pump pressure value is obtained in real time, and the real-time load value of the jack is calculated based on the jack calibration curve.

[0015] During the loading phase, loading is automatically performed based on the loading speed until the real-time load value of the jack is loaded to the load control value corresponding to that level.

[0016] After maintaining this load level for a first preset time period, if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation; if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation, so that the real-time load value of the jack is maintained at a certain level. ki - g~ki + d between;

[0017] During the unloading phase, the unloading is automatically performed based on the unloading speed until the real-time load value of the jack is unloaded to the load control value corresponding to that level.

[0018] After maintaining this load level for a second preset time period, if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation; if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation, so that the real-time load value of the jack is maintained at a certain level. k i -e~k i +g between.

[0019] In one possible implementation, the method further includes:

[0020] Monitor the test status; if the test status does not meet the preset conditions, control the oil pump to stop working.

[0021] In one possible implementation, the test state includes real-time anchor bolt displacement; if the test state does not meet preset conditions, the oil pump is controlled to stop working, including:

[0022] If the real-time anchor displacement is not less than the preset anchor displacement, the control oil pump will stop loading and trigger an alarm.

[0023] In one possible implementation, the test state includes a maximum loading time; if the test state does not meet preset conditions, the oil pump is controlled to stop working, including:

[0024] If the longest loading time of this stage is not less than the average loading time of this stage, and the real-time load value of the jack is less than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

[0025] In one possible implementation, the test state includes a maximum unloading time. If the test state does not meet the preset conditions, the oil pump is controlled to stop working, including:

[0026] If the longest unloading time of this stage is not less than the average unloading time of this stage, and the real-time load value of the jack is greater than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

[0027] In one possible implementation, the test state includes the anchor displacement and the real-time load value of the jack during the loading process. If the test state does not meet the preset conditions, the oil pump is controlled to stop working, including:

[0028] Obtain the real-time displacement of the anchor bolt at this level, and generate the displacement change curve of this level based on the real-time displacement of the anchor bolt at this level;

[0029] If the slope of the displacement change curve is greater than the preset slope, and the real-time load value of the jack is less than the preset load value, the oil pump will be controlled to stop loading and an alarm will be triggered.

[0030] On the other hand, the present invention also provides an anchor pull-out test control system, comprising:

[0031] The system includes a main unit, an integrated oil pump, a wireless displacement sensor, a jack, oil pipes, anchor bolts, anchors, a pressure plate, and a lithium battery. The integrated oil pump, the wireless displacement sensor, and the main unit are all connected via wireless communication.

[0032] The integrated oil pump has a built-in pressure sensor to obtain the oil circuit pressure value in real time and convert the real-time load value of the jack according to the jack calibration curve.

[0033] A wireless displacement sensor is installed on the upper end of the anchor bolt body to obtain anchor bolt displacement data in real time;

[0034] The host has a built-in anchor bolt pull-out test control method to control the pressure and flow rate during the loading and unloading of the oil pump during the pull-out test, and to stop the test and issue an alarm in case of abnormality.

[0035] This invention enables precise control of the oil pump flow rate and pressure during each stage of loading and unloading based on test parameters during the pull-out test. This allows for precise speed adjustment of the loading and unloading process at each stage, resulting in accurate and reliable test results with minimal error, meeting the required specifications.

[0036] Furthermore, by monitoring the test conditions, the oil pump is controlled to stop working when the test conditions do not meet the preset conditions, thus ensuring the safety of the pull-out test. Attached Figure Description

[0037] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 A flowchart illustrating an embodiment of the anchor pull-out test control method provided by the present invention;

[0039] Figure 2 This is a schematic diagram of an embodiment of an anchor pull-out test control system provided by the present invention. Detailed Implementation

[0040] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0041] In the description of the embodiments of the present invention, unless otherwise stated, "a plurality of" means two or more.

[0042] The terms "first," "second," etc., used in the embodiments of this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a technical feature defined with "first" or "second" may explicitly or implicitly include at least one of that feature.

[0043] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of the invention. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a mutually exclusive, independent, or alternative embodiment. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0044] The specific embodiments are described in detail below:

[0045] Please see Figure 1 , Figure 1 This is a flowchart illustrating an embodiment of an anchor bolt pull-out test control method provided by the present invention. A specific embodiment of the present invention discloses an anchor bolt pull-out test control method, wherein the anchor bolt pull-out test comprises multi-stage loading and multi-stage unloading, including:

[0046] Step 101: Obtain test parameters, and control the oil pump loading flow rate and the oil pump unloading flow rate during each loading and unloading process in the anchor bolt pull-out test based on the test parameters;

[0047] Step 102: Based on the test parameters, control the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test.

[0048] This invention enables precise control of the oil pump flow rate and pressure during each stage of loading and unloading based on test parameters during the pull-out test. This allows for precise speed adjustment of the loading and unloading process at each stage, resulting in accurate and reliable test results with minimal error, meeting the required specifications.

[0049] Before conducting the experiment, the experimental parameters must first be explained:

[0050] The test parameters in this invention include known parameters of inherent properties, test setting parameters, parameters that can be calculated based on the test setting parameters, and real-time measurement parameters.

[0051] Among them, the known parameters of the inherent properties include the rated force of the jack. a (kN), maximum test load of anchor bolt design P P (kN), rated flow rate of oil pump V 额Real-time flow rate of the oil pump v It can be done at 0.01%. V 额 To 100% V 额 Adjustment between them;

[0052] Test setup parameters include the initial flow rate of the oil pump. v 0, the load control value for each level k i (kN), maximum control value for loading speed q max+ Minimum loading speed control value q min+ Maximum unloading speed control value q max- and minimum unloading speed control value q min- The unit is kN / s.

[0053] Based on the set parameters, the following parameters can be obtained: the absolute value of the difference between the load control values ​​of the current level and the previous level: Δ = |k i - k i-1 | Among them, the load control value for each level k i They are not the same, so the difference in load control values ​​between the upper and lower levels is... Δ They are not necessarily exactly equal; the maximum loading time for this stage. t max+ = Δ / q min+ Minimum loading time for this stage t min+ = Δ / q max+ Average loading time at this level = ( t max+ +t min+ ) / 2; Maximum unloading time for this stage t max- = Δ / q min- Minimum unloading time for this stage t min- = Δ / q max- Average unloading time at this level =( t max- +t min- / 2; Load allowable overload value d =3%× ΔUnload allow overload value e =3%× Δ Allowed loadout value g =10%× Δ The specification requires that the actual load value be within ±10% of the control load value, with 3% and 10% being empirical values.

[0054] Furthermore, the parameters obtained in real time include the real-time load value of the jack. P Real-time loading / unloading time t Anchor displacement L The frequency of real-time anchor displacement acquisition is consistent with the frequency of real-time load acquisition. It should be noted that the real-time load value of the jack is acquired at the same frequency. P During the process, the oil pump's built-in pressure sensor can be used to obtain the oil circuit pressure value in real time, and then the real-time load value of the jack can be calculated based on the jack calibration curve.

[0055] To better understand this invention, the process of controlling the oil pump flow rate during loading and unloading is described below with specific examples:

[0056] In one embodiment of the present invention, controlling the oil pump loading flow rate during each loading stage and the oil pump unloading flow rate during each unloading stage of the anchor bolt pull-out test based on experimental parameters includes:

[0057]

[0058] in, V i加载 For the first i The oil pump loading flow rate of the grade, For the first i The average loading time of the stage, For the first i Real-time loading time at the level V i加载-1 For the first i-1 The oil pump loading flow rate of the grade, V i卸载 For the first i The unloading flow rate of the oil pump is at the level of [level]. For the first i The average unloading time of the stage, For the first i Real-time unloading time at the level V i卸载-1 For the first i-1 The unloading flow rate of the oil pump is at the level of [level]. f This is the proportionality coefficient.

[0059] The derivation of this calculation formula will now be described in detail, as follows:

[0060] At the start of the test, the oil pump was initially set to gear 5 by default, and the initial flow rate of the oil pump was... v 0 = 0.5 V 额 The first level of load is applied from 0 to the control load value. k 1, where the level above the first level of load control value is 0 by default.

[0061] Loading from 0 to 20% k During process 1, the time is recorded as follows: t 1. Among them, 20% are preferred examples, which corresponds to the influence of the proportional coefficient. f ,in, f = (1 - n) / n , n The percentage in the example ranges from 5% to 20%. Generally, a time that is too short is not representative of the average speed, while a time that is too long is not conducive to real-time speed adjustment.

[0062] like t min+ < t 1 / 20% < t max+ Continue loading the remaining 80%. k 1. The next level of load control value is also loaded when... v 0.

[0063] like t 1 / 20%≥ t max+ ,or t 1 / 20%≤ t min+ This indicates that the loading speed is not under control. q min+~ q max+ Within the specified range, if the oil pump needs to increase or decrease the flow rate, then the application of the remaining 80% k1 load needs to be adjusted accordingly. -t If it's completed within 1 minute, then the loading speed for the remaining 80% of the load control value is 80%. k 1 / ( -t 1) Oil pump flow rate v 0= 0.5V 额 At that time, the loading speed was 20%. k 1 / t 1. Based on the corresponding relationship, it can be concluded that the flow rate of the oil pump needs to be adjusted to [ ] for the next 80% load control value. v 0 *80%k 1 / ( -t 1)] / ( 20%k 1 / t1) Refine the formula, i.e., adjust the oil pump flow rate. v 1 =[2t 1 / ( -t 1) ]V 额 .

[0064] And so on, loading at the next level. k At time 2, the oil pump flow rate remains the same as the oil pump flow rate adjusted in the previous stage. v 1. From k 1 Load to 20%（k 2 -k 1 ）+k 1 = 0.2Δ + k 1. Time taken during the process t 2, if t min+ ＜t 2 / 20%＜t max+ Then the gear will remain. v 1. Continue loading the remaining 80% ( k 2 -k 1) The next level of control load value is also loaded when... v Gear 1;

[0065] like t 2 / 20%≥ t max+ ,or t 2 / 20%≤ t min+ This indicates that the loading speed is not under control. q min+~ q max+ Within this range, the oil pump needs to increase or decrease the flow rate. (Remaining 80%) Δ The loading of the load needs to be done -t If completed within 2 days, the loading speed of the remaining 80% of the load control value will be 80%. Δ / ( -t 2) Oil pump flow rate v At time 1, the loading speed is 20%. Δ / t 1. Based on the corresponding relationship, we can conclude that the flow rate of the oil pump needs to be adjusted to [ ] for the next 80% load control value. v 1 *80%Δ / ( -t 2) / (20%) Δ / t 2) Refine the formula, i.e., adjust the oil pump flow rate. v 2 =4v 1 t 2 / ( -t 2) Until the loading phase is completed and the maximum test load is reached. k i =P P .

[0066] Similarly, during the oil pump flow rate adjustment process in the unloading process, assuming the unloading control value starts from... k 8 Uninstall to k 9. Initially, the 20% unloading will use the flow rate of the previous stage of the oil pump. v 8. Record the time t 9. If t min- ＜t 9 / 20%＜t max- Then the gear will remain. v 8. Continue uninstalling the remaining 80% | k 9 -k 8|, the next level of load control value is also loaded. v 8th gear, if t 9 / 20%≥ t max- ,or t 9 / 20%≤ t min- This indicates that the unloading time is too long or too short, and the oil pump needs to increase or decrease the flow rate. (Remaining 80%) Δ Load unloading needs to be done -t If completed within 9 days, the unloading speed of the remaining 80% of the load control value will be 80%. Δ / ( -t 9) Oil pump flow rate v At 8:00, the unloading speed was 20%. Δ / t 9. Based on the corresponding relationship, we can conclude that the flow rate of the oil pump needs to be adjusted to the following value for the next 80% of the load control value: [v 8 *80% Δ / ( -t 9) ] / ( 20%Δ / t 9) Refine the formula, i.e., adjust the oil pump flow rate. v 9 =4v 8 t 9 / ( -t 9).

[0067] Therefore, based on the above process, we can conclude that:

[0068]

[0069] in, V i加载 For the first i The oil pump loading flow rate of the grade, For the first i The average loading time of the stage, For the first i Real-time loading time at the level V i加载-1 For the first i-1 The oil pump loading flow rate of the grade, V i卸载 For the first i The unloading flow rate of the oil pump is at the level of [level]. For the first i The average unloading time of the stage, For the first i Real-time unloading time at the level V i卸载-1 For the first i-1 The unloading flow rate of the oil pump is at the level of [level]. f This is the proportionality coefficient.

[0070] It should be noted that the main objective of this embodiment is to meet the loading and unloading speed requirements of the specifications and control the loading and unloading accuracy. Under different environments, the loading and unloading speed is affected by factors such as the oil pump flow rate, the rated output of the jack, the on-site setup environment, and the anchor bolt manufacturing process. This embodiment uses the loading and unloading conditions of a single anchor bolt's front section to deduce the required oil pump flow rate corresponding to the overall loading and unloading speed, determining the relationship between the loading and unloading speed and the oil pump flow rate, and thus controlling the oil pump flow rate to achieve control of the loading and unloading speed.

[0071] In one embodiment of the invention, the test parameters include the load control values ​​for each level. k i Allowed loadout value g Load allowable overload value d and unload allow overload value e .

[0072] The oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test are controlled based on experimental parameters, including:

[0073] The oil pump pressure value is obtained in real time, and the real-time load value of the jack is calculated based on the jack calibration curve.

[0074] During the loading phase, loading is automatically performed based on the loading speed until the real-time load value of the jack is loaded to the load control value corresponding to that level.

[0075] After maintaining this load level for a first preset time period, if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation; if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation, so that the real-time load value of the jack is maintained at a certain level. ki - g~ki + d between;

[0076] During the unloading phase, the unloading is automatically performed based on the unloading speed until the real-time load value of the jack is unloaded to the load control value corresponding to that level.

[0077] After maintaining this load level for a second preset time period, if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation; if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation, so that the real-time load value of the jack is maintained at a certain level. k i -e~k i +g between.

[0078] Understandably, the oil pump loading pressure and oil pump unloading pressure can be obtained in real time using the oil pump's built-in pressure sensor. For ease of calculation, the oil pump loading pressure and oil pump unloading pressure are converted into the real-time load value of the jack based on the jack calibration curve.

[0079] Specifically, during the loading phase, i.e. k i ＞k i - 1. When controlling P Load to k i Subsequently, if the pressure loading exceeds the value during the holding phase, i.e. P > k i +d Then unloading will occur, meaning the oil pump will be controlled to reduce the loading pressure until... P Target value reached k i Stop unloading; if the pressure is insufficient or drops, i.e. P < k i -g If the oil pump is not reloaded, then additional load will be applied, i.e., the oil pump will be controlled to increase the loading pressure value until the oil is reloaded. k i That is, the loading phase P Maintain at k i -g < P < k i +d During the uninstallation phase, i.e. k i ＜k i- 1. When controlling P Uninstall to k i Subsequently, if the pressure unloading exceeds the value during the holding phase, i.e. P < k i -e To perform reloading, control the oil pump to reduce the unloading pressure until... P Target value reached k i Stop loading; if the pressure increases, i.e. P > k i +g Then unloading will proceed, meaning the oil pump will be controlled to increase the unloading pressure value until unloading occurs. k i That is, the unloading phase P Maintain at k i -e < P < k i +g Currently, common control methods can only load during the loading phase and cannot unload during the unloading phase. This invention breaks away from the inherent single loading and unloading mechanism, and, in conjunction with algorithms, makes load control more precise.

[0080] In one embodiment of the present invention, the above method further includes:

[0081] The test status is monitored. If the test status does not meet the preset conditions, the oil pump is stopped. The test status includes real-time anchor bolt displacement. If the test status does not meet the preset conditions, the oil pump is stopped, including:

[0082] If the real-time anchor displacement is not less than the preset anchor displacement, control the oil pump to stop loading and trigger an alarm.

[0083] Understandably, when controlling the loading and unloading speed, the anchor bolt displacement is obtained in real time via a wireless displacement sensor. If this real-time anchor bolt displacement is not less than the set maximum elongation (i.e., the preset anchor bolt displacement), the oil pump is controlled to stop loading and an alarm is triggered. The maximum elongation can be calculated based on the anchor bolt type and construction process. By setting the maximum elongation, the system automatically judges, controls the test to stop, and triggers an alarm, effectively avoiding safety accidents caused by excessive anchor bolt pull-out or excessive jack lifting.

[0084] In one embodiment of the present invention, the test state includes a maximum loading time. If the test state does not meet the preset state conditions, the oil pump is controlled to stop working, including:

[0085] If the longest loading time of this stage is not less than the average loading time of this stage, and the real-time load value of the jack is less than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

[0086] It is understandable that the cumulative loading time of this level is calculated during the loading phase. t’ i+ ,like t’ i+ ≥ and P < k i If the longest loading time of this stage is not less than the average loading time of this stage, and the real-time load is less than the load control value of this stage, the oil pump will be stopped and an alarm will be triggered.

[0087] The test conditions include the maximum unloading time. If the test conditions do not meet the preset conditions, the oil pump will be stopped.

[0088] If the longest unloading time of this stage is not less than the average unloading time of this stage, and the real-time load value of the jack is greater than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

[0089] It is understandable that the cumulative uninstallation time for this level is calculated during the uninstallation phase. t’ i- ,like t’ i- ≥ and P > k i In other words, if the longest unloading time of this stage is not less than the average unloading time of this stage, and the real-time load is greater than the load control value of this stage, the oil pump will be stopped and an alarm will be triggered. It should be noted that monitoring this longest test state can effectively prevent various abnormal situations from occurring during the loading and unloading phases, such as oil pump failure, jack damage, or anchor clamp detachment. By setting the longest loading and unloading time for the oil pump, automatically judging, controlling the test stop, and triggering an alarm, the continuous operation of the oil pump for too long and the resulting safety accidents can be effectively avoided.

[0090] In one embodiment of the present invention, the test state includes the anchor displacement and the real-time load value of the jack during the loading process. If the test state does not meet the preset state conditions, the oil pump is controlled to stop working, including:

[0091] Obtain the real-time displacement of the anchor bolts at this level, and generate the displacement change curve of this level based on the real-time displacement of the anchor bolts at this level;

[0092] If the slope of the displacement change curve is greater than the preset slope, and the real-time load value of the jack is less than the preset load value for a preset number of times, the control oil pump will stop loading and trigger an alarm.

[0093] Understandably, during the automatic loading process at each level, the anchor displacement value is acquired in real time according to the set sampling frequency, such as 100ms, to generate the data for that level. L - tThe curve is fitted using the least squares method for the displacement values ​​at this level. If the slope of the curve at a certain moment... m t ＞m t-1 Furthermore, the real-time load value of the jacks during this loading process. P < k i-1 -g If the failure occurs twice consecutively, the anchor bolt is judged to have broken, the oil pump is stopped and an alarm is triggered. By setting up automatic judgment of anchor bolt breakage, controlling the test to stop and triggering an alarm, the occurrence of on-site accidents that could affect personal safety can be effectively avoided.

[0094] To better implement the anchor pull-out test control method in the embodiments of the present invention, based on the anchor pull-out test control method, correspondingly, as follows: Figure 2 As shown, this embodiment of the invention also provides an anchor bolt pull-out test control system, the anchor bolt pull-out test control system 200 including:

[0095] The main unit 201, integrated oil pump 202, wireless displacement sensor 203, jack 204, oil pipe 205, anchor bolt 206, anchor 207, pressure plate 208 and lithium battery 209 are all connected by wireless communication.

[0096] The integrated oil pump 202 has a built-in pressure sensor to obtain the oil circuit pressure value in real time and convert the real-time load data of the jack 204 according to the jack calibration curve.

[0097] The wireless displacement sensor 203 is installed on the upper end of the anchor bolt 206 to obtain anchor bolt displacement data in real time;

[0098] Oil pipe 205 is used to transmit oil in the integrated oil pump, anchor bolt 206 is used for quantitative anchor bolt pull-out test, anchor 207 is used to fix anchor bolt 206, pressure plate 208 is used to support the weight of system 200, and lithium battery 209 is used to provide power to system 200.

[0099] The host 201 incorporates the aforementioned anchor pull-out test control method, which is used to control the pressure and flow rate during the loading and unloading of the oil pump during the pull-out test, and to stop the test and issue an alarm in case of abnormal conditions.

[0100] By using wireless communication, on the one hand, test personnel can be kept away from the test site to protect their personal safety; on the other hand, cables are reduced, operation is convenient, and no manual operation is required throughout the test, saving manpower.

[0101] The anchor bolt pull-out test control system 200 provided in the above embodiments can realize the technical solutions described in the above anchor bolt pull-out test control method embodiments. The specific implementation principles of each module or unit can be found in the corresponding content in the above anchor bolt pull-out test control method embodiments, which will not be repeated here.

[0102] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for controlling anchor bolt pull-out tests, characterized in that, The anchor pull-out test involves multi-stage loading and multi-stage unloading, and the method includes: Obtaining test parameters, and controlling the oil pump loading flow rate during each loading stage and the oil pump unloading flow rate during each unloading stage of the anchor bolt pull-out test based on the test parameters, including: in, V i加载 For the first i The oil pump loading flow rate of the grade, For the first i The average loading time of the stage, For the first i Real-time loading time at the level V i加载-1 For the first i-1 The oil pump loading flow rate of the grade, V i卸载 For the first i The unloading flow rate of the oil pump is at the level of [level]. For the first i The average unloading time of the stage, For the first i Real-time unloading time at the level V i卸载-1 For the first i-1 The unloading flow rate of the oil pump is at the level of [level]. f This is the proportionality coefficient. f = (1-n) / n , n The value ranges from 5% to 20%; Based on the test parameters, the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test are controlled.

2. The anchor pull-out test control method according to claim 1, characterized in that, The test parameters include the load control values ​​for each level. k i Allowed loadout value g Load allowable overload value d and unload allow overload value e .

3. The anchor pull-out test control method according to claim 2, characterized in that, Based on the aforementioned test parameters, the oil pump loading pressure during each loading stage and the oil pump unloading pressure during each unloading stage of the anchor bolt pull-out test are controlled, including: The oil pump pressure value is obtained in real time, and the real-time load value of the jack is calculated based on the jack calibration curve. During the loading phase, loading is automatically performed based on the loading speed until the real-time load value of the jack is loaded to the load control value corresponding to that level. After maintaining this load level for a first preset time period, if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation; if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation, so that the real-time load value of the jack is maintained at a certain level. k i -g~k i +d between; During the unloading phase, the unloading is automatically performed based on the unloading speed until the real-time load value of the jack is unloaded to the load control value corresponding to that level. After maintaining this load level for a second preset time period, if the real-time load value of the jack decreases during the load-bearing period, the oil pump is controlled to perform a reloading operation; if the real-time load value of the jack increases during the load-bearing period, the oil pump is controlled to perform an unloading operation, so that the real-time load value of the jack is maintained at a certain level. k i -e~k i +g between.

4. The anchor pull-out test control method according to claim 1, characterized in that, The method further includes: Monitor the test status; if the test status does not meet the preset conditions, control the oil pump to stop working.

5. The anchor pull-out test control method according to claim 4, characterized in that, The test conditions include real-time anchor bolt displacement. If the test conditions do not meet the preset conditions, the oil pump will be stopped, including: If the real-time anchor displacement is not less than the preset anchor displacement, the control oil pump will stop loading and trigger an alarm.

6. The anchor pull-out test control method according to claim 4, characterized in that, The test state includes the maximum loading time. If the test state does not meet the preset conditions, the oil pump will be controlled to stop working, including: If the longest loading time of this stage is not less than the average loading time of this stage, and the real-time load value of the jack is less than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

7. The anchor bolt pull-out test control method according to claim 4, characterized in that, The test state includes the longest unloading time. If the test state does not meet the preset conditions, the oil pump will be controlled to stop working, including: If the longest unloading time of this stage is not less than the average unloading time of this stage, and the real-time load value of the jack is greater than the load control value of this stage, control the oil pump to stop loading and trigger an alarm.

8. The anchor pull-out test control method according to claim 4, characterized in that, The test conditions include the anchor displacement and the real-time load value of the jack during the loading process. If the test conditions do not meet the preset conditions, the oil pump will be controlled to stop working, including: Obtain the real-time displacement of the anchor bolt at this level, and generate the displacement change curve of this level based on the real-time displacement of the anchor bolt at this level; If the slope of the displacement change curve is greater than the preset slope, and the real-time load value of the jack is less than the preset load value, the oil pump will be controlled to stop loading and an alarm will be triggered.

9. A control system for anchor bolt pull-out tests, characterized in that, include: The system includes a main unit, an integrated oil pump, a wireless displacement sensor, a jack, oil pipes, anchor bolts, anchors, a pressure plate, and a lithium battery. The integrated oil pump, the wireless displacement sensor, and the main unit are all connected via wireless communication. The integrated oil pump has a built-in pressure sensor to obtain the oil circuit pressure value in real time and convert the real-time load value of the jack according to the jack calibration curve. A wireless displacement sensor is installed on the upper end of the anchor bolt body to obtain anchor bolt displacement data in real time; The host computer has a built-in anchor bolt pull-out test control method according to any one of claims 1-8, which is used to control the pressure and flow rate during the loading and unloading of the oil pump during the pull-out test, and to stop the test and alarm in case of abnormal conditions.

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