Jet method for pile diameter boundary of jet grouting pile
By installing temperature and pressure sensors on the rotary spray pile probe rod and combining the probe rod speed analysis, the value relationship of pile diameter evaluation is established, and real-time detection problems in rotary spray pile construction is solved, and efficient and accurate pile diameter detection is achieved.
Patent Information
- Application Number
- CN202411381329.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-01-07
AI Technical Summary
It is difficult to detect the pile diameter in real time during rotary spray pile construction, especially ultra-deep and ultra-long piles. The conventional core extraction method has poor aging, low accuracy, and is difficult to strengthen.
Install temperature sensors and pressure sensors on the probe rod, combine the probe rod speed for joint analysis, establish a correspondence between the comprehensive evaluation value and pile diameter, and predict the pile diameter through monitoring data to achieve real-time pile diameter detection.
The goal of real-time pile diameter detection of rotary spray piles has been achieved, the timeliness and accuracy of the inspection has been improved, and the pile boundaries can be clarified before the cement slurry is solidified.
Smart Images
Figure CN119266300A_ABST
Abstract
Description
Technical Field
[0001] The invention relates to the technical field of pile diameter boundary determination, and in particular to a method for determining the pile diameter boundary of a jet grouting pile. Background Art
[0002] High-pressure jet grouting piles use the grout channel and nozzle in the drill rod to spray cement slurry into the soil layer at high pressure, cut the soil, and fully mix the cement slurry and the in-situ soil. At the same time, the drill rod is rotated and lifted while spraying, thus forming high-pressure jet grouting piles. It is often used in the fields of foundation reinforcement, foundation pit water-stop curtain, etc. Its advantage is that it improves the material utilization rate of in-situ soil, can reinforce the soil layer at a specific depth, and reduce the cost of construction materials to a certain extent.
[0003] However, it is difficult to conduct real-time detection of the pile diameter in the current jet grouting construction, especially for ultra-deep and ultra-long piles. Conventional coring methods can only be performed after a certain age, and the coring of ultra-deep piles is difficult to ensure its own verticality, poor timeliness, low accuracy, and once the pile diameter is found to be too small, it is difficult to do reinforcement. If you want to conduct real-time detection of the pile diameter of the jet grouting pile, you need to clarify the pile boundary before the cement slurry solidifies, and cooperate with relevant detection equipment for detection. Therefore, the first step to achieve real-time detection of the jet grouting pile is to make a judgment by comparison. Based on this, the present invention proposes a method for determining the pile diameter boundary of the jet grouting pile. Summary of the invention
[0004] In order to address the shortcomings of the prior art, the present invention proposes a method for determining the diameter boundary of a jet grouting pile. A temperature sensor and a pressure sensor are installed on the probe rod, and the monitored data are jointly analyzed with the speed of the probe rod. Finally, a corresponding relationship between the comprehensive evaluation value and the pile diameter is established. After that, the pile diameter is directly predicted through the monitoring data, so that the goal of real-time pile diameter detection can be achieved.
[0005] The present invention adopts the following technical solution: The detection equipment is used to determine the boundary of the jet grouting pile. The detection equipment includes a probe rod, a temperature sensor, and a pressure sensor. The main parameters include the probe rod speed change rate, the temperature change rate, and the pressure change rate. The jet grouting pile diameter is detected based on the above three main parameters. The specific method is as follows: Step 1: Parameter threshold range measurement According to the on-site construction conditions, cement soil slurries of different consistencies and different material compositions are prepared, cylindrical holes with regular boundaries are artificially excavated using the on-site soil, and the prepared cement soil slurries are filled into the cylindrical holes. The threshold range of each parameter is measured using detection equipment, and a corresponding threshold database of each parameter under different working conditions is established; Step 2: Parameter sensitivity analysis Align the threshold ranges of the three parameters of probe speed change rate, temperature change rate, and pressure change rate, convert the threshold ranges of the two parameters with smaller threshold ranges into the threshold range of the parameter with the largest threshold range, and make them dimensionless. Compare the accuracy with the actual measured accuracy of the sensor. If the minimum accuracy can be measured by the sensor, it means high sensitivity, otherwise low sensitivity. Select the appropriate sensor based on the sensitivity. Step 3: Parameter weights and decision model A large number of tests were carried out under different working conditions. In each test, the probe rod of the detection equipment was pushed out of the pile boundary. The maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate during the probe rod pushing process were counted. The theoretical pile diameter of the test was deduced through the moments corresponding to the maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate combined with the opening distance of the detection equipment, and the actual pile diameter was measured by excavation. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the probe rod speed change rate was counted respectively. The actual pile diameter was within 5% of the deviation and was recorded as the quantitative value of the probe rod speed change rate A. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the temperature change rate was counted. The actual pile diameter was The value is within 5% deviation, recorded as B temperature change rate quantification value, the deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the pressure change rate is statistically analyzed, and the actual pile diameter is within 5% deviation, recorded as C pressure change rate quantification value, then, the weight of the probe rod speed change rate is A / (A+B+C)×probe rod speed change rate quantification value, the weight of the temperature change rate is B / (A+B+C)×temperature change rate quantification value, the weight of the pressure change rate is C / (A+B+C)×pressure change rate quantification value, and finally the mathematical model is established: comprehensive score = A / (A+B+C)×probe rod speed change rate quantification value + B / (A+B+C)×temperature change rate quantification value + C / (A+B+C)×pressure change rate quantification value; Step 4: Standard boundary determination The accuracy of the sensor and the determination method was calibrated. The consistency of cement soil slurry was measured according to the soil conditions of the test site, the soil layer distribution was clarified, and the jet grouting pile was used for construction and the detection equipment was used to determine the pile boundary. The pile head was excavated and the actual pile diameter was measured. The calculated pile diameter was compared with the actual pile diameter. When the difference between the two was less than 5%, the boundary determination was considered accurate. The corresponding relationship between the boundary conditions and the comprehensive score under different working conditions was established. Step 5: Actual pile diameter measurement The actual jet grouting piles are measured, and a comprehensive score is calculated based on the measured values of the probe rod speed change rate, temperature change rate, and pressure change rate. Then, the moment when the measuring rod reaches the pile diameter boundary is determined based on the corresponding relationship in step four. The distance the sensor is extended is calculated based on the structure of the measuring equipment and the oil pressure conditions, and then the pile diameter is calculated.
[0006] Preferably, artificially creating a regular boundary includes excavating regular holes in the soil and filling the holes with liquid medium, or filling a regular container with liquid medium.
[0007] Preferably, the three parameters of probe speed, temperature and pressure are aligned, and the specific quantification steps are as follows: 1> Identify the threshold range of probe speed, temperature and pressure; 2> Take the maximum threshold range of the three parameters as the standard; 3> Expand the threshold range of the other two parameters to the maximum threshold range; 4> The accuracy of the expanded threshold range is reduced by the expansion multiple.
[0008] The beneficial technical effects achieved by adopting the above technical solution are: By installing temperature sensors and pressure sensors on the probe rod and jointly analyzing the monitored data with the speed of the probe rod, a corresponding relationship between the comprehensive evaluation value and the pile diameter is finally established. The pile diameter is then directly predicted through the monitoring data, thus achieving the goal of real-time pile diameter detection. BRIEF DESCRIPTION OF THE DRAWINGS
[0009] Figure 1 The figure is a flow chart of a method for determining the boundary of the diameter of a jet grouting pile. DETAILED DESCRIPTION Embodiment 1:
[0010] Combined with Figure 1 The specific implementation mode of the present invention is further described as follows: The detection equipment is used to determine the boundary of the jet grouting pile. The detection equipment includes a probe rod, a temperature sensor, and a pressure sensor. The main parameters include the probe rod speed change rate, the temperature change rate, and the pressure change rate. The jet grouting pile diameter is detected based on the above three main parameters. The specific method is as follows: Step 1: Parameter threshold range measurement According to the on-site construction conditions, cement soil slurries of different consistencies and different material compositions are prepared, cylindrical holes with regular boundaries are artificially excavated using the on-site soil, and the prepared cement soil slurries are filled into the cylindrical holes. The threshold range of each parameter is measured using detection equipment, and a corresponding threshold database of each parameter under different working conditions is established; Step 2: Parameter sensitivity analysis Align the threshold ranges of the three parameters of probe speed change rate, temperature change rate, and pressure change rate, convert the threshold ranges of the two parameters with smaller threshold ranges into the threshold range of the parameter with the largest threshold range, and make them dimensionless. Compare the accuracy with the actual measured accuracy of the sensor. If the minimum accuracy can be measured by the sensor, it means high sensitivity, otherwise low sensitivity. Select the appropriate sensor based on the sensitivity. Step 3: Parameter weights and decision model A large number of tests were carried out under different working conditions. In each test, the probe rod of the detection equipment was pushed out of the pile boundary. The maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate during the probe rod pushing process were counted. The theoretical pile diameter of the test was deduced through the moments corresponding to the maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate combined with the opening distance of the detection equipment, and the actual pile diameter was measured by excavation. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the probe rod speed change rate was counted respectively. The actual pile diameter was within 5% of the deviation and was recorded as the quantitative value of the probe rod speed change rate A. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the temperature change rate was counted. The actual pile diameter was The value is within 5% deviation, recorded as B temperature change rate quantification value, the deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the pressure change rate is statistically analyzed, and the actual pile diameter is within 5% deviation, recorded as C pressure change rate quantification value, then, the weight of the probe rod speed change rate is A / (A+B+C)×probe rod speed change rate quantification value, the weight of the temperature change rate is B / (A+B+C)×temperature change rate quantification value, the weight of the pressure change rate is C / (A+B+C)×pressure change rate quantification value, and finally the mathematical model is established: comprehensive score = A / (A+B+C)×probe rod speed change rate quantification value + B / (A+B+C)×temperature change rate quantification value + C / (A+B+C)×pressure change rate quantification value; Step 4: Standard boundary determination The accuracy of the sensor and the determination method was calibrated. The consistency of cement soil slurry was measured according to the soil conditions of the test site, the soil layer distribution was clarified, and the jet grouting pile was used for construction and the detection equipment was used to determine the pile boundary. The pile head was excavated and the actual pile diameter was measured. The calculated pile diameter was compared with the actual pile diameter. When the difference between the two was less than 5%, the boundary determination was considered accurate. The corresponding relationship between the boundary conditions and the comprehensive score under different working conditions was established. Step 5: Actual pile diameter measurement The actual jet grouting piles are measured, and a comprehensive score is calculated based on the measured values of the probe rod speed change rate, temperature change rate, and pressure change rate. Then, the moment when the measuring rod reaches the pile diameter boundary is determined based on the corresponding relationship in step four. The distance the sensor is extended is calculated based on the structure of the measuring equipment and the oil pressure conditions, and then the pile diameter is calculated.
[0011] Preferably, artificially creating a regular boundary includes excavating regular holes in the soil and filling the holes with liquid medium, or filling a regular container with liquid medium.
[0012] Preferably, the three parameters of probe speed, temperature and pressure are aligned, and the specific quantification steps are as follows: 1> Identify the threshold range of probe speed, temperature and pressure; 2> Take the maximum threshold range of the three parameters as the standard; 3> Expand the threshold range of the other two parameters to the maximum threshold range; 4> The accuracy of the expanded threshold range is reduced by the expansion multiple. Embodiment 2:
[0013] Combined with Figure 1 The specific implementation mode of the present invention is further described as follows: The detection equipment is used to determine the boundary of the jet grouting pile. The detection equipment includes a probe rod, a temperature sensor, and a pressure sensor. The main parameters include the probe rod speed change rate, the temperature change rate, and the pressure change rate. The jet grouting pile diameter is detected based on the above three main parameters. The specific method is as follows: Step 1: Parameter threshold range measurement According to the on-site construction conditions, cement soil slurries of different consistencies and different material compositions were prepared. Cylindrical holes with regular boundaries were artificially excavated using the on-site soil, and the prepared cement soil slurries were filled into the cylindrical holes. The threshold range of each parameter was measured using detection equipment, and a corresponding threshold database of each parameter under different working conditions was established. For example, the threshold range of each parameter under different working conditions was measured as follows: velocity change rate 3-0.1mm / s, temperature rate 2-5 degrees Celsius / s, and pressure rate 20-80kN / s; Step 2: Parameter sensitivity analysis Align the threshold ranges of the three parameters of the probe speed change rate, temperature change rate, and pressure change rate, convert the threshold ranges of the two parameters with smaller threshold ranges into the threshold range of the parameter with the largest threshold range, and make them dimensionless. Compare the accuracy with the actual measured accuracy of the sensor. If the minimum accuracy can be measured by the sensor, it means high sensitivity, otherwise low sensitivity. Choose a suitable sensor based on the sensitivity. For example, the temperature 2-5 is converted to 20-80, which is equivalent to changing the interval length from 3 to 60. According to the interval accuracy of 1, the accuracy of 1 represents 0.05 degrees Celsius / s, which cannot be detected by the temperature sensor, so the temperature sensitivity is low. Step 3: Parameter weights and decision model A large number of tests were carried out under different working conditions. In each test, the probe rod of the detection equipment was pushed out of the pile boundary. The maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate during the probe rod pushing process were counted. The theoretical pile diameter of the test was deduced through the moments corresponding to the maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate combined with the opening distance of the detection equipment, and the actual pile diameter was measured by excavation. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the probe rod speed change rate was counted respectively. The actual pile diameter was within 5% of the deviation and was recorded as the quantitative value of the probe rod speed change rate A. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the temperature change rate was counted. The actual pile diameter was The value is within 5% deviation, recorded as B temperature change rate quantification value, the deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the pressure change rate is statistically analyzed, and the actual pile diameter is within 5% deviation, recorded as C pressure change rate quantification value, then, the weight of the probe rod speed change rate is A / (A+B+C)×probe rod speed change rate quantification value, the weight of the temperature change rate is B / (A+B+C)×temperature change rate quantification value, the weight of the pressure change rate is C / (A+B+C)×pressure change rate quantification value, and finally the mathematical model is established: comprehensive score = A / (A+B+C)×probe rod speed change rate quantification value + B / (A+B+C)×temperature change rate quantification value + C / (A+B+C)×pressure change rate quantification value; Step 4: Standard boundary determination The accuracy of the sensor and the determination method was calibrated. The consistency of cement soil slurry was measured according to the soil conditions of the test site, the soil layer distribution was clarified, and the jet grouting pile was used for construction and the detection equipment was used to determine the pile boundary. The pile head was excavated and the actual pile diameter was measured. The calculated pile diameter was compared with the actual pile diameter. When the difference between the two was less than 5%, the boundary determination was considered accurate. The corresponding relationship between the boundary conditions and the comprehensive score under different working conditions was established, and the corresponding relationship between the pile boundary determination conditions and the score was determined. Step 5: Actual pile diameter measurement The actual jet grouting piles are measured, and a comprehensive score is calculated based on the measured values of the probe rod speed change rate, temperature change rate, and pressure change rate. Then, the moment when the measuring rod reaches the pile diameter boundary is determined based on the corresponding relationship in step four. The distance the sensor is extended is calculated based on the structure of the measuring equipment and the oil pressure conditions, and then the pile diameter is calculated.
[0014] Preferably, artificially creating a regular boundary includes excavating regular holes in the soil and filling the holes with liquid medium, or filling a regular container with liquid medium.
[0015] Preferably, the three parameters of probe speed, temperature and pressure are aligned, and the specific quantification steps are as follows: 1> Identify the threshold range of probe speed, temperature and pressure; 2> Take the maximum threshold range of the three parameters as the standard; 3> Expand the threshold range of the other two parameters to the maximum threshold range; 4> The accuracy of the expanded threshold range is reduced by the expansion multiple.
[0016] Of course, the above description is only a preferred embodiment of the present invention, and the present invention is not limited to the above embodiments. It should be noted that all equivalent substitutions and obvious deformation forms made by any technician familiar with the field under the guidance of this specification fall within the essential scope of this specification and should be protected by the present invention.
Claims
1. A method for determining the boundary of a jet grouting pile diameter, characterized in that: The detection equipment is used to determine the boundary of the jet grouting pile. The detection equipment includes a probe rod, a temperature sensor, and a pressure sensor. The main parameters include the probe rod speed change rate, the temperature change rate, and the pressure change rate. The jet grouting pile diameter is detected based on the above three main parameters. The specific method is as follows: Step 1: Parameter threshold range measurement According to the on-site construction conditions, cement soil slurries of different consistencies and different material compositions are prepared, cylindrical holes with regular boundaries are artificially excavated using the on-site soil, and the prepared cement soil slurries are filled into the cylindrical holes. The threshold range of each parameter is measured using detection equipment, and a corresponding threshold database of each parameter under different working conditions is established; Step 2: Parameter sensitivity analysis Align the threshold ranges of the three parameters of probe speed change rate, temperature change rate, and pressure change rate, convert the threshold ranges of the two parameters with smaller threshold ranges into the threshold range of the parameter with the largest threshold range, and make them dimensionless. Compare the accuracy with the actual measured accuracy of the sensor. If the minimum accuracy can be measured by the sensor, it means high sensitivity, otherwise low sensitivity. Select the appropriate sensor based on the sensitivity. Step 3: Parameter weights and decision model A large number of tests were carried out under different working conditions. In each test, the probe rod of the detection equipment was pushed out of the pile boundary. The maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate during the probe rod pushing process were counted. The theoretical pile diameter of the test was deduced through the moments corresponding to the maximum value of the probe rod speed change rate, the maximum value of the temperature change rate, and the maximum value of the pressure change rate combined with the opening distance of the detection equipment, and the actual pile diameter was measured by excavation. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the probe rod speed change rate was counted respectively. The actual pile diameter was within 5% of the deviation and was recorded as the quantitative value of the probe rod speed change rate A. The deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the temperature change rate was counted. The actual pile diameter was The value is within 5% deviation, recorded as B temperature change rate quantification value, the deviation rate between the theoretical pile diameter and the actual pile diameter corresponding to the maximum value of the pressure change rate is statistically analyzed, and the actual pile diameter is within 5% deviation, recorded as C pressure change rate quantification value, then, the weight of the probe rod speed change rate is A / (A+B+C)×probe rod speed change rate quantification value, the weight of the temperature change rate is B / (A+B+C)×temperature change rate quantification value, the weight of the pressure change rate is C / (A+B+C)×pressure change rate quantification value, and finally the mathematical model is established: comprehensive score = A / (A+B+C)×probe rod speed change rate quantification value + B / (A+B+C)×temperature change rate quantification value + C / (A+B+C)×pressure change rate quantification value; Step 4: Standard boundary determination The accuracy of the sensor and the determination method was calibrated. The consistency of cement soil slurry was measured according to the soil conditions of the test site, the soil layer distribution was clarified, and the jet grouting pile was used for construction and the detection equipment was used to determine the pile boundary. The pile head was excavated and the actual pile diameter was measured. The calculated pile diameter was compared with the actual pile diameter. When the difference between the two was less than 5%, the boundary determination was considered accurate. The corresponding relationship between the boundary conditions and the comprehensive score under different working conditions was established. Step 5: Actual pile diameter measurement The actual jet grouting piles are measured, and a comprehensive score is calculated based on the measured values of the probe rod speed change rate, temperature change rate, and pressure change rate. Then, the moment when the measuring rod reaches the pile diameter boundary is determined based on the corresponding relationship in step four. The distance the sensor is extended is calculated based on the structure of the measuring equipment and the oil pressure conditions, and then the pile diameter is calculated.
2. A method for determining the diameter boundary of a jet grouting pile according to claim 1, characterized in that: Artificially creating regular boundaries includes excavating regular holes in the soil and filling the holes with liquid media, or filling regular containers with liquid media.
3. A method for determining the diameter boundary of a jet grouting pile according to claim 1, characterized in that: The three parameters of probe speed, temperature and pressure are aligned. The specific quantification steps are as follows: 1> Determine the threshold range of probe speed, temperature and pressure; 2> Take the maximum threshold range of the three parameters as the standard; 3> Expand the threshold range of the other two parameters to the maximum threshold range; 4> The accuracy of the expanded threshold range is reduced by the expansion multiple.