Rotary jet grouting pile diameter real-time detection equipment and construction method thereof

Abstract

The invention discloses real-time jet grouting pile diameter detection equipment and a construction method thereof, and belongs to the field of pile foundation construction quality detection.The real-time jet grouting pile diameter detection equipment comprises a detection rod, a supporting rod, a transmission rod, a lower connecting structure, an upper connecting structure and a sensor, the detection rod is hinged to the upper connecting structure, and the supporting rod is hinged to the lower connecting structure; the supporting rod is hinged to the detection rod, the lower end of the transmission rod is connected with the lower connecting structure, the upper end of the transmission rod penetrates through the upper connecting structure, the transmission rod and the upper connecting structure are not connected, and the sensor is fixed to the lower end of the detection rod through a pin shaft. The outer oil cylinder drives the transmission shaft to move up and down so as to drive the supporting rod to support and contract, the supporting rod drives the detection rod to open and close, and the opening of the supporting rod drives the sensor to move. By arranging the detection rod, the pressure sensor can extend to the boundary of the jet grouting pile along with the detection rod, the pile diameter of the position is judged, 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 real-time detection device for jet grouting pile diameter 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 diameter of the pile in real time during the construction of jet grouting piles, especially for ultra-deep and ultra-long piles. Conventional coring methods 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 real-time detection device 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 real-time detection device for the diameter of jet grouting piles 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 boundary of the pile and soil, the pile diameter at this 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 piles.

[0005] In order to achieve the above object, the present invention adopts the following technical solution: A real-time detection device for the diameter of a rotary jet pile is characterized in that it includes a detection rod, a support rod, a transmission rod, a lower connecting structure, an upper connecting structure, and a 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, and the sensor is fixed to the lower end of the detection rod by a pin; 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 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 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 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 sensor are all 2, and the sensor is a pressure sensor or a temperature sensor.

[0009] Preferably, the distance between the two 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 less than the diameter of the jet jet drill rod.

[0010] A construction method of a rotary grouting pile diameter real-time detection device, using a rotary grouting pile diameter real-time detection device 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 equipment into the jet grouting pile to be tested, and when the sensor detection value 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 sensor set value 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 sensor set value under the soil layer conditions; 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 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 jet-jet 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. The transmission shaft is driven downward by the external oil cylinder, thereby driving the support rod to prop up, the support rod drives the detection rod to open, and the opening of the support rod drives the sensor to move. When the measured value of the sensor reaches the set value, the sensor reaches the pile-soil boundary. 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 sensor reaches the pile boundary judgment condition, the extended position of the detection rod is calculated through the stroke of the external oil cylinder, and then the pile diameter at the detection position is calculated.

[0011] Beneficial technical effects brought by the present invention: (1) By integrating the detection 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 detection rod by 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 the 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 the mapping relationship between different soil layers and the critical value 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 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

[0012] Figure 1 The present invention discloses a real-time detection device for the diameter of jet grouting piles and an unfolded structural diagram of the detection device in the construction method thereof.

[0013] Figure 2 This is a closed structure diagram of a real-time detection device for the diameter of a jet grouting pile and a detection device in a construction method thereof according to the present invention.

[0014] Figure 3 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 of the jet grouting pile diameter and the construction method thereof of the present invention.

[0015] Among them: 1-detection rod, 2-support rod, 3-transmission rod, 4-lower connecting structure, 5-upper connecting structure, 6-sensor. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments: Embodiment 1:

[0017] like Figure 1-3As shown, a real-time detection device for the diameter of a rotary jet pile is characterized in that it includes a detection rod 1, a support rod 2, a transmission rod 3, a lower connecting structure 4, an upper connecting structure 5, and a sensor 6, 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, and the sensor 6 is fixed to the lower end of the detection rod 1 by a pin; 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 sensor 6 to move.

[0018] 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 sensor 6 determines whether the pile boundary has been 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 sensor 6 is determined by the oil pressure.

[0019] 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.

[0020] Preferably, the number of the detection rod 1, the support rod 2 and the sensor 6 are all 2, and the sensor 6 is a pressure sensor or a temperature sensor.

[0021] Preferably, the distance between the two sensors 6 after the detection rod 1 is extended is 0.2m-3.5m, and the outermost distance between the two rods after the detection rod 1 is closed is smaller than the diameter of the jet grouting drill rod.

[0022] A construction method of a rotary grouting pile diameter real-time detection device, using a rotary grouting pile diameter real-time detection device for detection, 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 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 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 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 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 jet-jet 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 set value of the sensor 6, the set value of the 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, the support rod 2 drives the detection rod 1 to open, and the opening of the support rod 2 drives the sensor 6 to move. When the measured value of the sensor 6 reaches the set value, the sensor 6 reaches the pile-soil boundary; 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 sensor 6 reaches the pile boundary determination condition, the extended position of the detection rod 1 is calculated through the stroke of the external oil cylinder, and then the pile diameter at the detection position is calculated. Embodiment 2:

[0023] like Figure 1-3 As shown, a real-time detection device for the diameter of a rotary jet pile is characterized in that it includes a detection rod 1, a support rod 2, a transmission rod 3, a lower connection structure 4, an upper connection structure 5, and a sensor 6, wherein the detection rod 1 is hinged to the upper connection structure 5, the support rod 2 is hinged to the lower connection 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 connection structure 4, the upper end of the transmission rod 3 passes through the inside of the upper connection structure 5, and the two are not connected, and the sensor 6 is fixed to the lower end of the detection rod 1 by a pin; the transmission shaft is driven up and down by an external oil 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 support rod 2 opens to drive the sensor 6 to move. The overall structure is similar to an umbrella structure, and the transmission rod 3 moves downward to push the support rod 2 downward, and the detection rod 1 is closed.

[0024] 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 sensor 6 determines whether the pile boundary has been 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 sensor 6 is determined by the oil pressure.

[0025] Preferably, the overall structure of the jet grouting pile diameter real-time detection device is connected to the jet grouting drill rod by bolts or welding, and the overall structure is located below the jet grouting nozzle. The detection device needs space to be opened, that is, the detection can only be carried out after the jet grouting is completed, so the nozzle must be above the detection device, and the detection can only be carried out after the drill is lifted and the jet grouting expands the space.

[0026] Preferably, the number of the detection rod 1, the support rod 2 and the sensor 6 are all 2, and the sensor 6 is a pressure sensor or a temperature sensor. The symmetric arrangement of two is for the overall balance of the device during detection, and 4 or 6 can also be arranged according to needs.

[0027] Preferably, the distance between the two sensors 6 after the detection rod 1 is extended is 0.2m-3.5m, and the outermost distance between the two rods after the detection rod 1 is closed is less than the diameter of the jet grouting drill rod. According to the needs, the detection rod 1 can be selected in different sizes, and then different opening distances can be selected to better match the aperture to be detected.

[0028] A construction method of a rotary grouting pile diameter real-time detection device, using a rotary grouting pile diameter real-time detection device for detection, the specific steps are as follows: Step 1: Calibration test When testing the jet grouting piles in different soil layers of the engineering site, the detection equipment is lowered into the jet grouting piles to be tested. When the detection value of the 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 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 sensor 6 under the soil layer conditions; the test jet grouting 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 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 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.

[0029] 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 sensor 6, the set value of the 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, the support rod 2 drives the detection rod 1 to open, and the opening of the support rod 2 drives the sensor 6 to move. When the measured value of the sensor 6 reaches the set value, the sensor 6 reaches the pile-soil boundary; 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 sensor 6 reaches the pile boundary determination condition, the extended position of the detection rod 1 is calculated through the stroke of the external oil cylinder, and then the pile diameter at the detection position is calculated.

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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 diameter, characterized in that: It includes a detection rod, a support rod, a transmission rod, a lower connecting structure, an upper connecting structure, and a 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, and the sensor is fixed to the lower end of the detection rod by a pin shaft; the transmission shaft is driven up and down by an external oil 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 sensor to move.

2. A real-time detection device for jet grouting pile diameter 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 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 oil pressure, that is, the extended distance of the sensor is determined by the oil pressure.

3. A real-time detection device for jet grouting pile diameter 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 diameter according to claim 1, characterized in that: The number of the detection rod, the support rod and the sensor are all 2, and the sensor is a pressure sensor or a temperature sensor.

5. The real-time detection device for the diameter of jet grouting piles according to claim 1 is characterized in that: When the detection rod is extended, the distance between the two 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 construction method of a real-time detection device for jet grouting pile diameter, characterized in that: The detection is performed using the real-time detection device for the diameter of jet grouting piles as described in claim 1, 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 equipment into the jet grouting pile to be tested, and when the sensor detection value 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 sensor set value 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 sensor set value under the soil layer conditions; 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 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 jet-jet 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. The transmission shaft is driven downward by the external oil cylinder, thereby driving the support rod to prop up, the support rod drives the detection rod to open, and the opening of the support rod drives the sensor to move. When the measured value of the sensor reaches the set value, the sensor reaches the pile-soil boundary. 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 sensor reaches the pile boundary judgment condition, the extended position of the detection rod is calculated through the stroke of the external oil cylinder, and then the pile diameter at the detection position is calculated.

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