Rotary jet grouting pile diameter multi-angle detection structure and construction method thereof

Abstract

The invention discloses a rotary jet grouting pile diameter multi-angle detection structure and a construction method thereof, and belongs to the field of pile foundation construction quality detection.The rotary jet grouting pile diameter multi-angle detection structure comprises a rotary jet grouting drill rod, a rotary pin shaft, a telescopic probe rod and a sensor, the rotary pin shaft is installed on the rotary jet grouting drill rod, the telescopic probe rod is fixedly installed on the rotary pin shaft, and the sensor is installed at the end of the telescopic probe rod; the motor is installed in the rotary spraying drill rod, a rotating shaft of the motor and the rotating pin shaft are in transmission through a gear, and the hydraulic oil cylinder is installed in the telescopic probe rod. The initial position of the telescopic probe rod coincides with the drill rod, the rotating pin shaft rotates after the motor is started, when the telescopic probe rod is perpendicular to the drill rod, the rotating pin shaft is limited, the motor is stopped, the hydraulic oil cylinder is started to enable the telescopic probe rod to extend, the sensor touches the pile boundary, and the pile diameter is calculated through the stroke of the hydraulic oil cylinder. The pile diameter can be detected in the construction process through the detection structure, reinforcing measures are taken in time for the pile diameter which does not meet the requirement, and therefore the construction quality of the jet grouting pile is guaranteed.

Description

Technical Field

[0001] The invention belongs to the field of pile foundation construction quality detection, and specifically relates to a rotary jet grouting pile diameter multi-angle detection structure 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, it is difficult to detect the pile diameter in real time during the current jet grouting construction, especially for ultra-deep and ultra-long piles. Conventional coring can only be performed after a certain age. Moreover, it is difficult to ensure the verticality of the coring of ultra-deep piles, which has poor timeliness and low accuracy. Once the pile diameter is found to be too small, it is difficult to perform reinforcement treatment. Based on this, in order to ensure the construction quality of jet grouting piles, the present invention proposes a multi-angle detection structure for the diameter of jet grouting piles 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 multi-angle detection structure for the diameter of a jet grouting pile and a construction method thereof, which overcomes the shortcomings of the prior art. By setting a rotating pin and a telescopic probe, the sensor can contact the boundary of the jet grouting pile with the telescopic probe, and multiple tests are performed in advance to establish a mapping relationship between different soil layers and the critical value of the sensor. When the pile diameter detection work is formally carried out, once the sensor reaches the boundary of the pile and soil, the pile diameter at that position can be known according to the predetermined mapping relationship, and reinforcement measures are 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 multi-angle detection structure for the diameter of a jet grouting pile, characterized in that it comprises a jet grouting drill rod, a rotating pin, a telescopic probe rod, and a sensor, wherein the rotating pin is installed on the jet grouting drill rod, the rotating pin is a hollow structure, the telescopic probe rod is fixed on the rotating pin, and the sensor is installed at the end of the telescopic probe rod; It also includes a motor and a hydraulic cylinder. The motor is installed inside the jet-jet drill rod. The rotating shaft of the motor and the rotating pin shaft are driven by gears. The hydraulic cylinder is installed inside the telescopic probe rod. The oil pipe of the hydraulic cylinder passes through the hollow part of the rotating pin shaft and passes through the inside of the drill rod to connect with the hydraulic station. The initial position of the telescopic probe coincides with the drill rod. After starting the motor, the rotating pin rotates. When the telescopic probe is perpendicular to the drill rod, the rotating pin is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe. The sensor touches the pile boundary and the pile diameter is calculated by the stroke of the hydraulic cylinder.

[0006] Preferably, the overall structure of the multi-angle detection structure for the jet grouting pile diameter is located below the jet grouting nozzle.

[0007] Preferably, the number of the rotating pin, the telescopic probe and the sensor is 1-2. When two are provided, the two sets of structures are symmetrically distributed along the axis of the rotary jet drilling rod. The sensor is a pressure sensor or a temperature sensor.

[0008] Preferably, after the telescopic probe is extended, the distance between the sensors at both ends of the same telescopic probe is 0.2m-3.5m.

[0009] A construction method of a multi-angle detection structure for a jet grouting pile diameter, using a multi-angle detection structure for a jet grouting pile diameter for detection, the specific steps are as follows: Step 1: Calibration test Construct and test jet grouting piles in different soil layers of the project site, lower the detection structure into the jet grouting pile to be tested, and when the sensor detection value reaches the set value during the extension of the telescopic probe rod, it is considered that the pile boundary has been reached, and the telescopic probe rod stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the sensor set value and the extension length of the telescopic probe rod under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter under the soil layer conditions and the sensor set value; excavate the test jet grouting pile, and measure the actual pile diameter. When the actual pile diameter is the same as the calculated pile diameter, the sensor set value 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 structure to the jet grouting drill rod, overlap the telescopic probe rod with the drill rod, and lower it to the designed jet grouting pile depth together with the drill rod, and form the jet grouting pile through jet grouting construction; Step 3: Pile diameter detection When the drilling and jetting drill head is lifted to the position to be detected, the 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 sensor setting value obtained by the calibration test. After the motor is started, the rotating pin shaft rotates. When the telescopic probe rod is perpendicular to the drill rod position, the rotating pin shaft is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe rod, and the sensor touches the pile boundary. Step 4: Retract the device The telescopic probe is retracted by retracting the oil in the hydraulic cylinder, and the motor is turned on to drive the rotating pin to rotate. When the telescopic probe coincides with the drill rod, the motor is stopped; Step 5: Detection Data Output When the sensor reaches the pile boundary judgment condition, the extension position of the telescopic probe is calculated through the stroke of the hydraulic cylinder, and then the pile diameter at the detection position is calculated.

[0010] Beneficial technical effects brought by the present invention: (1) By integrating the telescopic probe rod and the sensor and connecting them to the jet grouting drill rod, the pile diameter can be detected conveniently and quickly during the jet grouting process. There is no need to replace the drill tool after construction, which reduces the operation links and improves the detection efficiency. (2) The sensor is fixed to the lower end of the probe rod through a pin shaft, which can realize the detection of the diameter of jet grouting piles of different diameters, thereby improving the application range of the device. (3) Through the mapping relationship between the cylinder stroke and the pile diameter, the pile diameter at a certain position can be obtained, thereby ensuring the real-time acquisition of construction quality. (4) By setting a rotating pin shaft and a telescopic probe rod, the sensor can be connected to the boundary of the jet grouting pile with the telescopic probe rod. Multiple tests are carried out in advance to establish the mapping relationship between different soil layers and the critical value of the sensor. When the pile diameter detection work is officially carried out, once the sensor reaches the boundary of the pile and soil, the pile diameter at that position can be obtained according to the predetermined mapping relationship. For those that do not meet the requirements, reinforcement measures are taken in time, thereby ensuring the construction quality of the jet grouting pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a schematic diagram of the process of the telescopic probe rod from coinciding with the drill rod to being perpendicular to the drill rod and extending in the multi-angle detection structure and construction method of the rotary jet pile diameter of the present invention.

[0012] Among them: 1-jet drilling rod, 2-rotating pin shaft, 3-telescopic probe rod, 4-sensor. DETAILED DESCRIPTION

[0013] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:

[0014] like Figure 1 As shown, a multi-angle detection structure for the diameter of a jet grouting pile is characterized in that it comprises a jet grouting drill rod 1, a rotating pin 2, a telescopic probe rod 3, and a sensor 4, wherein the rotating pin 2 is installed on the jet grouting drill rod 1, the rotating pin 2 is a hollow structure, the telescopic probe rod 3 is installed and fixed on the rotating pin 2, and the sensor 4 is installed at the end of the telescopic probe rod 3; It also includes a motor and a hydraulic cylinder. The motor is installed inside the jet-jet drill rod 1. The rotating shaft of the motor and the rotating pin 2 are driven by gears. The hydraulic cylinder is installed in the telescopic probe rod 3. The oil pipe of the hydraulic cylinder passes through the hollow part of the rotating pin 2 and is connected to the hydraulic station through the inside of the drill rod. The initial position of the telescopic probe 3 coincides with the drill rod. After the motor is started, the rotating pin 2 rotates. When the telescopic probe 3 is perpendicular to the drill rod, the rotating pin 2 is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe 3. The sensor 4 touches the pile boundary, and the pile diameter is calculated by the stroke of the hydraulic cylinder.

[0015] Preferably, the overall structure of the multi-angle detection structure for the jet grouting pile diameter is located below the jet grouting nozzle.

[0016] Preferably, the number of the rotating pin 2, the telescopic probe 3 and the sensor 4 is 1-2. When two are provided, the two sets of structures are symmetrically distributed along the axis of the rotary jet drilling rod 1. The sensor 4 is a pressure sensor or a temperature sensor.

[0017] Preferably, after the telescopic probe rod 3 is extended, the distance between the sensors 4 at both ends of the same telescopic probe rod 3 is 0.2m-3.5m.

[0018] A construction method of a multi-angle detection structure for a jet grouting pile diameter, using a multi-angle detection structure for a jet grouting pile diameter for detection, the specific steps are as follows: Step 1: Calibration test The test jet grouting pile is constructed in different soil layers of the engineering site, and the detection structure is lowered into the jet grouting pile to be tested. When the detection value of the sensor 4 reaches the set value during the extension of the telescopic probe 3, it is considered that the pile boundary has been reached, and the telescopic probe 3 stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the sensor 4 and the extension length of the telescopic probe 3 under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter under the soil layer conditions and the set value of the sensor 4; the test jet grouting pile is 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 sensor 4 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 The detection structure is connected to the jet grouting drill rod 1, the telescopic probe rod 3 is overlapped with the drill rod, and is lowered to the designed jet grouting pile depth together with the drill rod, and the jet grouting construction forms the jet grouting pile; Step 3: Pile diameter detection When the drilling and jetting drill head 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 setting value of the sensor 4, the setting value of the sensor 4 is set as the pile boundary judgment condition of the soil layer in the calibration test, and the rotating pin shaft 2 is rotated by starting the motor. When the telescopic probe rod 3 is perpendicular to the drill rod position, the rotating pin shaft 2 is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe rod 3, and the sensor 4 touches the pile boundary; Step 4: Retract the device The telescopic probe rod 3 is retracted by retracting the oil of the hydraulic cylinder, and the motor is turned on to drive the rotating pin shaft 2 to rotate. When the position of the telescopic probe rod 3 coincides with the position of the drill rod, the motor is stopped; Step 5: Detection Data Output When the sensor 4 reaches the pile boundary determination condition, the extension position of the telescopic probe 3 is calculated through the stroke of the hydraulic cylinder, and then the pile diameter at the detection position is calculated. Embodiment 2:

[0019] like Figure 1 As shown, a multi-angle detection structure for the diameter of a jet grouting pile is characterized in that it comprises a jet grouting drill rod 1, a rotating pin 2, a telescopic probe rod 3, and a sensor 4, wherein the rotating pin 2 is installed on the jet grouting drill rod 1, the rotating pin 2 is a hollow structure, the telescopic probe rod 3 is installed and fixed on the rotating pin 2, and the sensor 4 is installed at the end of the telescopic probe rod 3; It also includes a motor and a hydraulic cylinder. The motor is installed inside the jet-jet drill rod 1. The rotating shaft of the motor and the rotating pin 2 are driven by gears. The hydraulic cylinder is installed in the telescopic probe rod 3. The oil pipe of the hydraulic cylinder passes through the hollow part of the rotating pin 2 and is connected to the hydraulic station through the inside of the drill rod. The initial position of the telescopic probe 3 coincides with the drill rod. After the motor is started, the rotating pin 2 rotates. When the telescopic probe 3 is perpendicular to the drill rod, the rotating pin 2 is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe 3. The sensor 4 touches the pile boundary, and the pile diameter is calculated by the stroke of the hydraulic cylinder.

[0020] Preferably, the overall structure of the multi-angle detection structure for jet grouting pile diameter is located below the jet grouting nozzle. The detection structure needs space to rotate and open, that is, the detection can only be carried out after the jet grouting is completed. Therefore, the nozzle must be above the detection structure, and the detection can only be carried out after the drilling and jet grouting expand the space.

[0021] Preferably, the number of the rotating pin 2, the telescopic probe 3, and the sensor 4 is 1-2. When two are provided, the two sets of structures are symmetrically distributed along the axis of the jet grouting drill rod 1. The sensor 4 is a pressure sensor or a temperature sensor. The overall structure of the telescopic drill rod can be provided in two sets, so that there is no need to rotate 180 degrees to measure the other side, saving operation time.

[0022] Preferably, after the telescopic probe 3 is extended, the distance between the sensors 4 at both ends of the same telescopic probe 3 is 0.2m-3.5m. The telescopic probe 3 can be selected in different sizes according to needs, and then different opening distances can be selected to better match the aperture to be detected.

[0023] A construction method of a multi-angle detection structure for a jet grouting pile diameter, using a multi-angle detection structure for a jet grouting pile diameter for detection, the specific steps are as follows: Step 1: Calibration test The test jet grouting pile is constructed in different soil layers of the engineering site, and the detection structure is lowered into the jet grouting pile to be tested. When the detection value of the sensor 4 reaches the set value during the extension of the telescopic probe 3, it is considered that the pile boundary has been reached, and the telescopic probe 3 stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the set value of the sensor 4 and the extension length of the telescopic probe 3 under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter and the set value of the sensor 4 under the soil layer conditions; the test jet grouting pile is 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 sensor 4 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 4 to reach the boundary 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.

[0024] Step 2: Spraying piles The detection structure is connected to the jet grouting drill rod 1, the telescopic probe rod 3 is overlapped with the drill rod, and is lowered to the designed jet grouting pile depth together with the drill rod, and the jet grouting construction forms the jet grouting pile; Step 3: Pile diameter detection When the drilling and jetting drill head 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 setting value of the sensor 4, the setting value of the sensor 4 is set as the pile boundary judgment condition of the soil layer in the calibration test, and the rotating pin shaft 2 is rotated by starting the motor. When the telescopic probe rod 3 is perpendicular to the drill rod position, the rotating pin shaft 2 is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe rod 3, and the sensor 4 touches the pile boundary; Step 4: Retract the device The telescopic probe rod 3 is retracted by retracting the oil of the hydraulic cylinder, and the motor is turned on to drive the rotating pin shaft 2 to rotate. When the position of the telescopic probe rod 3 coincides with the position of the drill rod, the motor is stopped; Step 5: Detection Data Output When the sensor 4 reaches the pile boundary determination condition, the extension position of the telescopic probe 3 is calculated through the stroke of the hydraulic cylinder, and then the pile diameter at the detection position is calculated.

[0025] 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.

[0026] 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.

[0027] 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.

[0028] 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.

[0029] 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 multi-angle detection structure for jet grouting pile diameter, characterized in that: It includes a jet grouting drill rod, a rotating pin, a telescopic probe rod, and a sensor, wherein the rotating pin is installed on the jet grouting drill rod, the rotating pin is a hollow structure, the telescopic probe rod is installed and fixed on the rotating pin, and the sensor is installed on the end of the telescopic probe rod; It also includes a motor and a hydraulic cylinder. The motor is installed inside the jet-jet drill rod. The rotating shaft of the motor and the rotating pin shaft are driven by gears. The hydraulic cylinder is installed inside the telescopic probe rod. The oil pipe of the hydraulic cylinder passes through the hollow part of the rotating pin shaft and passes through the inside of the drill rod to connect with the hydraulic station. The initial position of the telescopic probe coincides with the drill rod. After starting the motor, the rotating pin rotates. When the telescopic probe is perpendicular to the drill rod, the rotating pin is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe. The sensor touches the pile boundary and the pile diameter is calculated by the stroke of the hydraulic cylinder.

2. A multi-angle detection structure for jet grouting pile diameter according to claim 1, characterized in that: The overall structure of the multi-angle detection structure for the jet grouting pile diameter is located below the jet grouting nozzle.

3. A multi-angle detection structure for jet grouting pile diameter according to claim 1, characterized in that: The number of the rotating pin, the telescopic probe and the sensor is 1-2. When two are provided, the two sets of structures are symmetrically distributed along the axis of the jet-jet drill rod. The sensor is a pressure sensor or a temperature sensor.

4. A multi-angle detection structure for jet grouting pile diameter according to claim 1, characterized in that: After the telescopic probe rod is extended, the distance between the sensors at both ends of the same telescopic probe rod is 0.2m-3.5m.

5. A construction method for a multi-angle detection structure of a jet grouting pile diameter, characterized in that: The multi-angle detection structure for the diameter of the jet grouting pile described in claim 1 is used for detection, and the specific steps are as follows: Step 1: Calibration test Construct and test jet grouting piles in different soil layers of the project site, lower the detection structure into the jet grouting pile to be tested, and when the sensor detection value reaches the set value during the extension of the telescopic probe rod, it is considered that the pile boundary has been reached, and the telescopic probe rod stops extending and automatically retracts. By changing the set value, a series of corresponding relationships between the sensor set value and the extension length of the telescopic probe rod under the soil layer conditions are established, that is, the corresponding relationship between the calculated pile diameter under the soil layer conditions and the sensor set value; excavate the test jet grouting pile, and measure the actual pile diameter. When the actual pile diameter is the same as the calculated pile diameter, the sensor set value 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 structure to the jet grouting drill rod, overlap the telescopic probe rod with the drill rod, and lower it to the designed jet grouting pile depth together with the drill rod, and form the jet grouting pile through jet grouting construction; Step 3: Pile diameter detection When the drilling and jetting drill head is lifted to the position to be detected, the 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 sensor setting value obtained by the calibration test. After the motor is started, the rotating pin shaft rotates. When the telescopic probe rod is perpendicular to the drill rod position, the rotating pin shaft is limited, the motor stops, and the hydraulic cylinder is started to extend the telescopic probe rod, and the sensor touches the pile boundary. Step 4: Retract the device The telescopic probe is retracted by retracting the oil in the hydraulic cylinder, and the motor is turned on to drive the rotating pin to rotate. When the telescopic probe coincides with the drill rod, the motor is stopped; Step 5: Detection Data Output When the sensor reaches the pile boundary judgment condition, the extension position of the telescopic probe is calculated through the stroke of the hydraulic cylinder, and then the pile diameter at the detection position is calculated.

Images