Rotary jet grouting pile quality real-time detection equipment and construction method thereof
Through the detection rods and sensors of real-time detection equipment to monitor the diameter and perpendicularity of the rotary spray pile, the detection problems in the construction of rotary spray piles are solved, the construction quality and efficiency are improved, and the cost is reduced.
Patent Information
- Application Number
- CN202411368368.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-29
- Publication Date
- 2024-12-20
AI Technical Summary
During the construction of rotary spray piles, it is difficult to detect the diameter and verticality of piles in real time, especially ultra-deep and ultra-long piles. The core extraction method has poor aging and low accuracy, and it is prone to shrinkage or protrusion during construction, which affects the construction quality and cost.
Design a real-time detection device for quality of rotary spray piles. By setting up detection rods and sensors, establish the mapping relationship between soil layer and pressure sensors, monitor the pile diameter and verticality in real time, and use inclination sensors and displacement sensors to calculate the pile diameter and verticality in reverse. Take timely reinforcement measures.
Real-time quality monitoring in rotary spray pile construction is realized, the timeliness and accuracy of inspection is improved, the verticality and diameter of the pile body meet the requirements, and the construction cost is reduced.
Smart Images
Figure CN119163084A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the field of pile foundation construction quality detection, and specifically relates to a real-time detection device for jet grouting pile quality and a construction method thereof. 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, in the current jet grouting pile construction, it is difficult to detect the pile diameter and verticality in real time, especially for super deep and super long piles. Conventional coring methods can only be carried out after a certain age, and for the coring of super deep piles, its own verticality is also difficult to guarantee, with poor timeliness and low accuracy, and once it is found that the pile diameter is too small, it is also difficult to do reinforcement treatment. In addition, when constructed in different soil layers, the jet grouting pile is prone to necking or bulging. At the same time, the jet grouting pile is affected by the verticality of the lead hole during the construction process, and the verticality of the pile will also be affected, and even the deviation will be larger. At this time, if the pile body quality can be monitored during the construction process, including verticality, pile diameter, etc., it is also more convenient to solve in time and reduce construction costs. Based on this, in order to ensure the construction quality of the jet grouting pile, the present invention proposes a real-time detection device for the quality of the jet grouting pile and a construction method thereof. Summary of the invention
[0004] In view of the above technical problems existing in the prior art, the present invention proposes a real-time detection device for jet grouting pile quality and a construction method thereof, which overcomes the shortcomings of the prior art. By setting a detection rod, the pressure sensor can be extended to the boundary of the jet grouting pile along with the detection rod, and multiple tests are performed in advance to establish a mapping relationship between different soil layers and the critical value of the pressure sensor. When the pile diameter detection work is formally carried out, once the pressure sensor reaches the pile-soil boundary, the pile diameter at this position can be known according to the predetermined mapping relationship; in addition, the inclination angle of the detection rod is measured by the inclination sensor. When the jet grouting pile has irregular boundary deformation, or the verticality deviation is large, resulting in the inclination of the borehole, the pile diameter and verticality can be inversely calculated by the distance between the displacement sensor measurement value and the pressure sensor, and reinforcement measures can be taken in time for those that do not meet the requirements, thereby ensuring the construction quality of the jet grouting pile.
[0005] In order to achieve the above object, the present invention adopts the following technical solution: A real-time detection device for the quality of rotary jet piles, characterized in that it includes a detection rod, a support rod, a transmission rod, a lower connecting structure, an upper connecting structure, a pressure sensor, a changing device, and an inclination sensor, wherein the detection rod is hinged to the upper connecting structure, the support rod is hinged to the lower connecting structure, the support rod is hinged to the detection rod, the lower end of the transmission rod is connected to the lower connecting structure, the upper end of the transmission rod passes through the inside of the upper connecting structure, and the two are not connected, a changing device is arranged in the middle of the transmission rod, the changing device includes a universal hinge and a limit spring, the universal hinge and the limit spring are respectively connected to the upper and lower sections of the transmission rod, the pressure sensor is fixed to the lower end of the detection rod by a pin shaft, and the inclination sensor is installed on the upper connecting structure; the transmission shaft is driven up and down by an external oiling cylinder, thereby driving the support rod to prop up and shrink, the support rod drives the detection rod to open and close, and the opening of the support rod drives the pressure sensor to move.
[0006] Preferably, the external oiling cylinder is located above the transmission rod and is fixed to the transmission rod by bolts or welding; the data measured by the pressure sensor determines whether the pile boundary has been reached, and at the same time, the extended position of the detection rod is calculated by the stroke of the external oiling cylinder, and the formation of the external oiling cylinder is calculated by the oil pressure, that is, the extended distance of the pressure sensor is determined by the oil pressure.
[0007] Preferably, the overall structure of the real-time detection device for jet grouting pile diameter is connected to the jet grouting drill rod by bolts or welding, and the overall structure is located below the jet grouting nozzle.
[0008] Preferably, the number of the detection rod, the support rod and the pressure sensor are all 2.
[0009] Preferably, the distance between the two pressure sensors after the detection rod is extended is 0.2m-3.5m, and the outermost distance between the two rods after the detection rod is closed is smaller than the diameter of the jet jet drill rod.
[0010] Preferably, the direction-changing device causes the transmission rod to change its angle, with the universal joint in the direction-changing device as the corner point, the angle formed by the upper and lower sections of the transmission rod is 60 degrees-180 degrees, the limit spring is a high-strength spring, and the two limit springs are symmetrically arranged.
[0011] A construction method of a real-time detection device for jet grouting pile quality, characterized in that a real-time detection device for jet grouting pile quality is used for detection, and the specific steps are as follows: Step 1: Calibration test Construct and test the jet grouting piles in different soil layers of the project site, lower the detection equipment into the jet grouting piles to be tested, and when the detection value of the pressure sensor reaches the set value during the extension of the detection rod, it is considered that the pile boundary has been reached, and the detection rod stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the pressure sensor and the extension length of the detection rod under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter and the set value of the pressure sensor under the soil layer conditions; excavate the test jet grouting piles, and measure the actual pile diameter. When the actual pile diameter is the same as the calculated pile diameter, the set value of the pressure sensor corresponding to the calculated pile diameter is the judgment condition of the pile boundary under the soil layer conditions; by measuring a series of set values, the judgment conditions of the pile boundary under different soil layer conditions are calibrated; Step 2: Spraying piles Connect the detection equipment to the jet grouting drill rod, retract the detection rod, and lower it together with the drill rod to the designed jet grouting pile depth, and form the jet grouting pile through jet grouting construction; Step 3: Pile diameter detection When the drill bit is lifted to the position to be detected, the pressure sensor setting value is set as the pile boundary judgment condition of the soil layer in the calibration test according to the type of the soil layer to be detected and the corresponding relationship between the soil layer and the pressure sensor setting value obtained by the calibration test. The transmission shaft is driven downward by the external oil cylinder, thereby driving the support rod to prop up, and the support rod drives the detection rod to open. The opening of the support rod drives the pressure sensor to move. When the pressure sensor reaches the pile boundary judgment condition, the pressure sensor reaches the pile-soil boundary, and the monitoring value of the inclination sensor is recorded at this time; Step 4: Retract the device The transmission shaft is driven upward by the external oil cylinder, thereby driving the support rod to retract, and the support rod drives the detection rod to close until the detection rod is completely closed; Step 5: Detection Data Output When the pressure sensor reaches the pile boundary judgment condition, the extension position of the detection rod is calculated by the stroke of the external oil cylinder, and the offset of the detection rod is calculated by the monitoring value of the inclination sensor. At the same time, the pile diameter and verticality are calculated, and the pile body quality is evaluated.
[0012] Beneficial technical effects brought by the present invention: By setting up a detection rod, the pressure sensor can be extended to the boundary of the jet grouting pile with the detection rod. Multiple tests are carried out in advance to establish a mapping relationship between different soil layers and the critical values of the pressure sensor. When the pile diameter detection work is officially carried out, once the pressure sensor reaches the pile-soil boundary, the pile diameter at that position can be known according to the predetermined mapping relationship. In addition, the inclination angle of the detection rod is measured by the inclination sensor. When the jet grouting pile has irregular boundary deformation, or the verticality deviation is large, causing the borehole to tilt, the pile diameter and verticality can be inversely calculated through the distance between the displacement sensor measurement value and the pressure sensor. Reinforcement measures can be taken in time for those that do not meet the requirements, thereby ensuring the construction quality of the jet grouting pile. BRIEF DESCRIPTION OF THE DRAWINGS
[0013] Figure 1 The present invention is a detection state diagram of a real-time detection device for jet grouting pile quality and a construction method thereof in a jet grouting pile with a large verticality deviation or irregular deformation of the pile boundary.
[0014] Figure 2 The present invention is a detection state diagram of a real-time detection device for jet grouting pile quality and a construction method thereof in a jet grouting pile with good verticality.
[0015] Figure 3 This is a structural diagram of a real-time detection device for jet grouting pile quality and a construction method thereof after the detection device is closed.
[0016] Figure 4 The present invention is a structural diagram of a real-time detection device for jet grouting pile quality and a direction-changing device in a construction method thereof.
[0017] Figure 5 It is a schematic diagram of the contact between the pressure sensor and the pile boundary under different angle conditions of the detection rod in the real-time detection equipment for jet grouting pile quality and the construction method thereof of the present invention.
[0018] Among them: 1-detection rod, 2-support rod, 3-transmission rod, 4-lower connecting structure, 5-upper connecting structure, 6-pressure sensor, 7-direction changing device, 8-tilt sensor. DETAILED DESCRIPTION
[0019] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:
[0020] like Figure 1-5As shown, a real-time detection device for the quality of rotary jet piles comprises a detection rod 1, a support rod 2, a transmission rod 3, a lower connecting structure 4, an upper connecting structure 5, a pressure sensor 6, a direction-changing device 7, and an inclination sensor 8, wherein the detection rod 1 is hinged to the upper connecting structure 5, the support rod 2 is hinged to the lower connecting structure 4, the support rod 2 is hinged to the detection rod 1, the lower end of the transmission rod 3 is connected to the lower connecting structure 4, the upper end of the transmission rod 3 passes through the inside of the upper connecting structure 5, and the two are not connected, a direction-changing device 7 is arranged in the middle of the transmission rod 3, the direction-changing device 7 comprises a universal hinge and a limit spring, the universal hinge and the limit spring are respectively connected to the upper and lower sections of the transmission rod 3, the pressure sensor 6 is fixed to the lower end of the detection rod 1 by a pin shaft, and the inclination sensor 8 is installed on the upper connecting structure 5; the transmission shaft is driven up and down by an external oiling cylinder, thereby driving the support rod 2 to prop up and shrink, the support rod 2 drives the detection rod 1 to open and close, and the opening of the support rod 2 drives the pressure sensor 6 to move.
[0021] Preferably, the external oiling cylinder is located above the transmission rod 3 and is fixed to the transmission rod 3 by bolts or welding; the data measured by the pressure sensor 6 determines whether the pile boundary is reached, and at the same time, the extended position of the detection rod 1 is calculated by the stroke of the external oiling cylinder, and the formation of the external oiling cylinder is calculated by the oil pressure, that is, the extended distance of the pressure sensor 6 is determined by the oil pressure.
[0022] Preferably, the overall structure of the real-time detection device for jet grouting pile diameter is connected to the jet grouting drill rod by bolts or welding, and the overall structure is located below the jet grouting nozzle.
[0023] Preferably, the number of the detection rod 1, the support rod 2 and the pressure sensor 6 are all two.
[0024] Preferably, the distance between the two pressure sensors 6 is 0.2m-3.5m after the detection rod 1 is extended, and the outermost distance between the two rods is smaller than the diameter of the jet jet drill rod after the detection rod 1 is closed.
[0025] Preferably, the direction-changing device 7 causes the transmission rod 3 to change its angle. With the universal joint in the direction-changing device 7 as the corner point, the angle formed by the upper and lower sections of the transmission rod 3 is 60 degrees to 180 degrees. The limit spring is a high-strength spring, and the two limit springs are symmetrically arranged.
[0026] A construction method of a real-time detection device for jet grouting pile quality, characterized in that a real-time detection device for jet grouting pile quality is used for detection, and the specific steps are as follows: Step 1: Calibration test The rotary jet piles to be tested are constructed in different soil layers of the engineering site, and the detection equipment is lowered into the rotary jet piles to be tested. When the detection value of the pressure sensor 6 reaches the set value during the extension of the detection rod 1, it is considered that the pile boundary has been reached, and the detection rod 1 stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the pressure sensor 6 and the extension length of the detection rod 1 under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter and the set value of the pressure sensor 6 under the soil layer conditions; the test rotary jet piles are excavated and the actual pile diameter is measured. When the actual pile diameter is the same as the calculated pile diameter, the set value of the pressure sensor 6 corresponding to the calculated pile diameter is the determination condition of the pile boundary under the soil layer conditions; the determination conditions of the pile boundary under different soil layer conditions are calibrated by measuring a series of set values; Step 2: Spraying piles Connect the detection equipment to the jet grouting drill rod, retract the detection rod 1, and lower it together with the drill rod to the designed jet grouting pile depth, and form the jet grouting pile through jet grouting construction; Step 3: Pile diameter detection When the drilling and spraying drill bit is lifted to the position to be detected, according to the type of the soil layer to be detected and the corresponding relationship between the soil layer obtained by the calibration test and the set value of the pressure sensor 6, the set value of the pressure sensor 6 is set as the pile boundary judgment condition of the soil layer in the calibration test, and the transmission shaft is driven to move downward by the external oil cylinder, thereby driving the support rod 2 to prop up, and the support rod 2 drives the detection rod 1 to open, and the opening of the support rod 2 drives the pressure sensor 6 to move. When the pressure sensor 6 reaches the pile boundary judgment condition, the pressure sensor 6 reaches the pile-soil boundary, and the monitoring value of the inclination sensor 8 is recorded at this time; Step 4: Retract the device The transmission shaft is driven upward by the external oil cylinder, thereby driving the support rod 2 to contract, and the support rod 2 drives the detection rod 1 to close until the detection rod 1 is completely closed; Step 5: Detection Data Output When the pressure sensor 6 reaches the pile boundary judgment condition, the extended position of the detection rod 1 is calculated by the stroke of the external oil cylinder, and the offset of the detection rod 1 is calculated by the monitoring value of the inclination sensor 8. At the same time, the pile diameter and verticality are calculated, and the pile body quality is evaluated. Embodiment 2:
[0027] like Figure 1-5As shown, a real-time detection device for the quality of rotary jet piles comprises a detection rod 1, a support rod 2, a transmission rod 3, a lower connecting structure 4, an upper connecting structure 5, a pressure sensor 6, a direction-changing device 7, and an inclination sensor 8, wherein the detection rod 1 is hinged to the upper connecting structure 5, the support rod 2 is hinged to the lower connecting structure 4, the support rod 2 is hinged to the detection rod 1, the lower end of the transmission rod 3 is connected to the lower connecting structure 4, the upper end of the transmission rod 3 passes through the inside of the upper connecting structure 5, and the two are not connected, a direction-changing device 7 is arranged in the middle of the transmission rod 3, the direction-changing device 7 comprises a universal hinge and a limit spring, the universal hinge and the limit spring are respectively connected to the upper and lower sections of the transmission rod 3, the pressure sensor 6 is fixed to the lower end of the detection rod 1 by a pin shaft, and the inclination sensor 8 is installed on the upper connecting structure 5; the transmission shaft is driven up and down by an external oiling cylinder, thereby driving the support rod 2 to prop up and shrink, the support rod 2 drives the detection rod 1 to open and close, and the opening of the support rod 2 drives the pressure sensor 6 to move. The overall structure is similar to an umbrella structure, except that the middle part of the umbrella rod is set as a live joint. The purpose of this setting is that when the upper drill rod is still vertical, when the verticality is too large, the transmission rod 3 is subjected to the bending moment. At this time, the transmission rod 3 is easy to deform, resulting in failure of the entire structure. For this reason, a change-of-direction device 7 is added. The universal joint in the device can solve the problem of bending moment, but straightening after bending or returning to the original position cannot be solved by its own structure. For this reason, a damping spring is added. The universal joint is constrained by the spring to prevent it from rotating at will, and the rotation requires a certain thrust, thereby ensuring the reliability of the structure.
[0028] Preferably, the external oiling cylinder is located above the transmission rod 3 and is fixed to the transmission rod 3 by bolts or welding; the data measured by the pressure sensor 6 determines whether the pile boundary is reached, and at the same time, the extended position of the detection rod 1 is calculated by the stroke of the external oiling cylinder, and the formation of the external oiling cylinder is calculated by the oil pressure, that is, the extended distance of the pressure sensor 6 is determined by the oil pressure.
[0029] Preferably, the overall structure of the real-time detection device for jet grouting pile diameter is connected to the jet grouting drill rod by bolts or welding, and the overall structure is located below the jet grouting nozzle.
[0030] Preferably, the number of the detection rod 1, the support rod 2 and the pressure sensor 6 are all two.
[0031] Preferably, the distance between the two pressure sensors 6 is 0.2m-3.5m after the detection rod 1 is extended, and the outermost distance between the two rods is smaller than the diameter of the jet jet drill rod after the detection rod 1 is closed.
[0032] Preferably, the direction-changing device 7 causes the transmission rod 3 to change its angle. With the universal joint in the direction-changing device 7 as the corner point, the angle formed by the upper and lower sections of the transmission rod 3 is 60 degrees to 180 degrees. The limit spring is a high-strength spring, and the two limit springs are symmetrically arranged.
[0033] A construction method of a real-time detection device for jet grouting pile quality, characterized in that a real-time detection device for jet grouting pile quality is used for detection, and the specific steps are as follows: Step 1: Calibration test The rotary jet piles are constructed and tested in different soil layers of the engineering site, and the detection equipment is lowered into the rotary jet piles to be tested. When the detection value of the pressure sensor 6 reaches the set value during the extension of the detection rod 1, it is considered that the pile boundary has been reached, and the detection rod 1 stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the pressure sensor 6 and the extension length of the detection rod 1 under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter and the set value of the pressure sensor 6 under the soil layer conditions; the test rotary jet piles are excavated and the actual pile diameter is measured. When the actual pile diameter is the same as the calculated pile diameter, the set value of the pressure sensor 6 corresponding to the calculated pile diameter is the determination condition of the pile boundary under the soil layer conditions; the determination conditions of the pile boundary under different soil layer conditions are calibrated by measuring a series of set values; the force required by the pressure sensor 6 under different soil layer conditions is determined by calibration tests, and this value can lay the foundation for the subsequent reverse application of the boundary force.
[0034] Step 2: Spraying piles Connect the detection equipment to the jet grouting drill rod, retract the detection rod 1, and lower it together with the drill rod to the designed jet grouting pile depth, and the jet grouting construction forms the jet grouting pile; the process of jet grouting pile formation will be affected by the soil state. Generally, the same construction parameters are used for the entire pile, so necking or over-spraying may occur in different soil layers, and the pile body may deviate from the designed position due to poor control of the verticality of the initial hole.
[0035] Step 3: Pile diameter detection When the drilling and spraying drill bit is lifted to the position to be detected, according to the type of the soil layer to be detected and the corresponding relationship between the soil layer obtained by the calibration test and the set value of the pressure sensor 6, the set value of the pressure sensor 6 is set as the pile boundary judgment condition of the soil layer in the calibration test, and the transmission shaft is driven to move downward by the external oil cylinder, thereby driving the support rod 2 to prop up, and the support rod 2 drives the detection rod 1 to open, and the opening of the support rod 2 drives the pressure sensor 6 to move. When the pressure sensor 6 reaches the pile boundary judgment condition, the pressure sensor 6 reaches the pile-soil boundary, and the monitoring value of the inclination sensor 8 is recorded at this time; Step 4: Retract the device The transmission shaft is driven upward by the external oil cylinder, thereby driving the support rod 2 to contract, and the support rod 2 drives the detection rod 1 to close until the detection rod 1 is completely closed; Step 5: Detection Data Output When the pressure sensor 6 reaches the pile boundary judgment condition, the extended position of the detection rod 1 is calculated by the stroke of the external oil cylinder, and the offset of the detection rod 1 is calculated by the monitoring value of the inclination sensor 8. At the same time, the pile diameter and verticality are calculated, and the pile body quality is evaluated.
[0036] In the description of the present invention, it is necessary to understand that the orientations or positional relationships indicated by terms such as "center", "up", "down", "front", "back", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.
[0037] In the description of the embodiments of the present invention, the term "and / or" refers to and covers any and all possible combinations of one or more of the associated listed items. The term "and / or" is a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects before and after are in an "or" relationship.
[0038] In the description of the embodiments of the present invention, the terms "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element. In the absence of further restrictions, an element defined by the statement "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.
[0039] The above description is only a specific embodiment of the present invention, so that those skilled in the art can understand or implement the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments described herein, but should conform to the widest scope consistent with the principles and novel features disclosed herein.
[0040] Of course, the above description is not a limitation of the present invention, and the present invention is not limited to the above examples. Changes, modifications, additions or substitutions made by technicians in this technical field within the essential scope of the present invention also fall within the protection scope of the present invention.
Claims
1. A real-time detection device for jet grouting pile quality, characterized in that: It includes a detection rod, a support rod, a transmission rod, a lower connecting structure, an upper connecting structure, a pressure sensor, a changing device, and an inclination sensor, wherein the detection rod is hinged to the upper connecting structure, the support rod is hinged to the lower connecting structure, the support rod is hinged to the detection rod, the lower end of the transmission rod is connected to the lower connecting structure, the upper end of the transmission rod passes through the inside of the upper connecting structure, and the two are not connected, a changing device is arranged in the middle of the transmission rod, the changing device includes a universal hinge and a limit spring, the universal hinge and the limit spring are respectively connected to the upper and lower sections of the transmission rod, the pressure sensor is fixed to the lower end of the detection rod by a pin shaft, and the inclination sensor is installed on the upper connecting structure; the transmission shaft is driven up and down by an external oil cylinder, thereby driving the support rod to prop up and contract, the support rod drives the detection rod to open and close, and the opening of the support rod drives the pressure sensor to move.
2. A real-time detection device for jet grouting pile quality according to claim 1, characterized in that: The external oiling cylinder is located above the transmission rod and is fixed to the transmission rod by bolts or welding; the data measured by the pressure sensor determines whether the pile boundary has been reached, and at the same time, the extended position of the detection rod is calculated by the stroke of the external oiling cylinder. The formation of the external oiling cylinder is calculated by the oil pressure, that is, the extended distance of the pressure sensor is determined by the oil pressure.
3. A real-time detection device for jet grouting pile quality according to claim 1, characterized in that: The overall structure of the real-time detection device for jet grouting pile diameter is connected to the jet grouting drill rod by bolts or welding, and the overall structure is located below the jet grouting nozzle.
4. A real-time detection device for jet grouting pile quality according to claim 1, characterized in that: The number of the detection rod, the support rod and the pressure sensor are all 2.
5. A real-time detection device for jet grouting pile quality according to claim 1, characterized in that: When the detection rod is extended, the distance between the two pressure sensors is 0.2m-3.5m. When the detection rod is closed, the outermost distance between the two rods is less than the diameter of the jet jet drilling rod.
6. A real-time detection device for jet grouting pile quality according to claim 1, characterized in that: The direction-changing device causes the transmission rod to change its angle. With the universal joint in the direction-changing device as the corner point, the angle formed by the upper and lower sections of the transmission rod is 60 degrees to 180 degrees. The limit spring is a high-strength spring, and the two limit springs are symmetrically arranged.
7. A construction method of a real-time detection device for jet grouting pile quality, characterized in that: The real-time detection device for jet grouting pile quality described in claim 1 is used for detection, and the specific steps are as follows: Step 1: Calibration test Construct and test the jet grouting piles in different soil layers of the project site, lower the detection equipment into the jet grouting piles to be tested, and when the detection value of the pressure sensor reaches the set value during the extension of the detection rod, it is considered that the pile boundary has been reached, and the detection rod stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the pressure sensor and the extension length of the detection rod under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter and the set value of the pressure sensor under the soil layer conditions; excavate the test jet grouting piles, and measure the actual pile diameter. When the actual pile diameter is the same as the calculated pile diameter, the set value of the pressure sensor corresponding to the calculated pile diameter is the judgment condition of the pile boundary under the soil layer conditions; by measuring a series of set values, the judgment conditions of the pile boundary under different soil layer conditions are calibrated; Step 2: Spraying piles Connect the detection equipment to the jet grouting drill rod, retract the detection rod, and lower it together with the drill rod to the designed jet grouting pile depth, and form the jet grouting pile through jet grouting construction; Step 3: Pile diameter detection When the drill bit is lifted to the position to be detected, the pressure sensor setting value is set as the pile boundary judgment condition of the soil layer in the calibration test according to the type of the soil layer to be detected and the corresponding relationship between the soil layer and the pressure sensor setting value obtained by the calibration test. The transmission shaft is driven downward by the external oil cylinder, thereby driving the support rod to prop up, and the support rod drives the detection rod to open. The opening of the support rod drives the pressure sensor to move. When the pressure sensor reaches the pile boundary judgment condition, the pressure sensor reaches the pile-soil boundary, and the monitoring value of the inclination sensor is recorded at this time; Step 4: Retract the device The transmission shaft is driven upward by the external oil cylinder, thereby driving the support rod to retract, and the support rod drives the detection rod to close until the detection rod is completely closed; Step 5: Detection Data Output When the pressure sensor reaches the pile boundary judgment condition, the extension position of the detection rod is calculated by the stroke of the external oil cylinder, and the offset of the detection rod is calculated by the monitoring value of the inclination sensor. At the same time, the pile diameter and verticality are calculated, and the quality of the pile body is evaluated.