High-pressure jet grouting pile diameter detection system and method based on isotope thickness measurement principle

Abstract

The invention discloses a high-pressure jet grouting pile diameter detection system based on an isotope thickness measurement principle and a use method of the high-pressure jet grouting pile diameter detection system. Comprising a drilling rod and a drilling table, the drilling rod is used for touching the side wall of the underground high-pressure jet grouting pile and measuring the pile diameter of the underground high-pressure jet grouting pile, and the drilling table is used for jacking the drilling rod into a soil layer. In order to realize pile diameter measurement, radioactive isotope solvent diffusion, radioactive intensity perception and diameter calibration back calculation methods are fused, and point-to-surface non-contact nondestructive diameter measurement is realized. And a strong spring, an inward pushing amount detection device and a simulated object hardness measurement method are adopted, so that whether a hard object at the front end of the drill rod is a pile body or not in the drilling process is effectively identified, and the information definition of the underground drilling condition is improved.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of high-pressure rotary jet pile diameter detection, more specifically, relates to a high-pressure rotary jet pile diameter detection system and method based on the isotopic thickness measurement principle. BACKGROUND

[0002] High-pressure rotary jet pile construction is a foundation treatment technology, which is widely used in building foundation reinforcement, subway and tunnel engineering, bridge and highway construction, slope stability, water conservancy engineering and environmental remediation. The principle of this technology is to inject cement slurry or other chemical materials along the sidewall of the drill hole through high-pressure jet, to realize the mixing of slurry and form a consolidated body. After the high-pressure rotary jet pile is formed, the pile diameter must be detected as an important evaluation index of pile quality. However, the current underground pile diameter measurement technology is insufficient and still remains in the stage of destructive measurement. Therefore, it is of great significance to propose a safer and more convenient pile diameter measurement method for the optimization and improvement of high-pressure rotary jet pile construction technology.

[0003] Currently, the main pile diameter measurement methods are pre-pile vibration detection and post-pile coring detection. Among them, the pre-pile vibration detection method is to drill several monitoring holes inside and outside the designed pile diameter line before pile formation, and to bury steel casings with vibration sensors fixed. The sensor is used to sense the vibration amplitude signal to determine the penetration depth of high-pressure jet grouting. This detection method can quickly predict the pile diameter through the vibration sensor. In addition, the coring detection method is to take core samples from the pile body and conduct strength detection to determine the effective pile diameter.

[0004] The above technical solutions have realized the measurement of high-pressure rotary jet pile diameter, but still have the following technical problems: in the above vibration detection method, the non-reusable application scheme of fixing the sensor to the steel casing will inevitably cause a large amount of sensor consumption; in addition, the sensor is continuously shot by high-pressure water jet, which greatly increases the safety protection difficulty of this scheme; (2) in the above coring detection method, the destructive detection scheme of sampling the pile body itself will inevitably affect the strength of the pile body; (3) based on (1) and (2), a non-destructive and reusable special pile diameter measurement system or method should be considered to solve the above problems. SUMMARY

[0005] In view of the above defects or improvement needs of the prior art, the present application provides a high-pressure rotary jet pile diameter detection system based on the isotopic thickness measurement principle and its use method. To realize pile diameter measurement, the system combines radioactive isotope solvent diffusion, radiation intensity sensing and diameter calibration inversion method to realize non-contact and non-destructive diameter measurement from point to plane. The system also uses a strong spring and an internal thrust detection device to simulate the hardness measurement method of the object, to realize the effective identification of the hard object at the front end of the drill rod as the pile body during drilling, and to improve the information clarity of the underground drilling condition.

[0006] According to the first aspect of the present application, the high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle comprises:

[0007] The drilling rod is used for reaching the sidewall of the underground high-pressure rotary jet pile and measuring the pile diameter, and comprises a threaded drill rod, a pile body touch probe assembly arranged at the front end of the threaded drill rod, and a pile diameter detection assembly; the pile diameter detection assembly comprises a claw closing groove arranged on the sidewall of the front end of the drilling rod, a claw opening sliding groove arranged on the sidewall of the claw closing groove, a diameter detection probe claw closing into the claw closing groove and slidingly connected with the claw opening sliding groove, a probe claw flat assembly for controlling the diameter detection probe claw to extend and close, and a radioactive isotope solvent storage and release assembly arranged in the drilling rod.

[0008] The drilling platform is used for advancing the drilling rod into the soil layer, and comprises a movable platform, a ground positioning part arranged around the movable platform, an inclined support assembly arranged above the movable platform, and a drilling driving assembly arranged at the output end of the inclined support assembly and used for driving the drilling rod to advance forward.

[0009] Preferably, the pile body touch probe assembly comprises:

[0010] The conical end is arranged at the front end of the drilling rod, the push head is arranged at the center of the conical end and slides axially, the strong spring is arranged at the rear end of the push head, and the distance measuring assembly is used for measuring the retraction amount of the push head.

[0011] Preferably, the distance measuring assembly comprises a magnetic sheet arranged on the inner end surface of the push head and a magnetic distance measuring device arranged on the inner end surface of the sliding groove at the center of the conical end.

[0012] Preferably, the diameter detection probe claw comprises:

[0013] The sliding shaft is arranged at one end of the diameter detection probe claw and slidingly connected with the claw opening sliding groove.

[0014] The isotope injection hole is arranged on the front side of the diameter detection probe claw, and is used for releasing the radioactive isotope solvent around the pile body under the control of the radioactive isotope solvent storage and release assembly and automatically completing uniform diffusion.

[0015] The radiation intensity sensing head is arranged on the front side of the diameter detection probe claw and is used for sensing the radiation intensity in front of the diameter detection probe claw.

[0016] The orientation adjusting assembly is used for adjusting the orientations of the isotope injection hole and the radiation intensity sensing head.

[0017] Preferably, the orientation adjusting assembly comprises:

[0018] The installation inner cavity is arranged on the side surface of the caliper probe, the caliper carrier is coaxially arranged with the caliper probe and is rotatably arranged in the installation inner cavity, and the angle adjusting knob is used for adjusting the axial angle between the caliper carrier and the caliper probe.

[0019] Preferably, the probe flat expansion assembly comprises:

[0020] The driving motor is arranged in the drilling rod, the double-pitch screw rod is coaxially fixedly connected with the driving motor, the first rod segment and the second rod segment are divided according to different pitches of the double-pitch screw rod, the outer end expansion block and the inner end pushing block are respectively threadedly connected with the first rod segment and the second rod segment, the outer end expansion rod is rotatably connected between the outer end of the caliper probe and the outer end expansion block, and the inner end pushing rod is rotatably connected between the inner end of the caliper probe and the inner end pushing block.

[0021] Preferably, the inclined support assembly comprises:

[0022] The push-up air cylinder is hingedly connected to the movable platform, the bearing plate is rotatably connected to the extension rod end of the push-up air cylinder, and the inclination disc is arranged on the upper surface of the movable platform; the drilling driving assembly is arranged on the upper surface of the bearing plate; and one side edge of the bearing plate is hingedly connected to the upper surface of the movable platform.

[0023] Preferably, the drilling driving assembly comprises:

[0024] The drilling driving motor, the driving gear coaxially fixedly connected with the output shaft of the drilling driving motor, the driven gear meshingly connected with the driving gear, the driving threaded sleeve coaxially fixedly connected with the driven gear, the bearing seat supporting rotation of the driving threaded sleeve, and the support seat coaxially fixedly arranged on the upper surface of the bearing plate.

[0025] The circumferential limiting block is arranged on the inner surface of the support seat, and the circumferential limiting groove is arranged on the side wall of the threaded drill rod; and the circumferential limiting block and the circumferential limiting groove are slidably connected.

[0026] According to the second aspect of the present application, a use method of a high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle comprises the following steps:

[0027] S100: First, the movable platform is used to move the system to the target construction site, and the movable platform is fixed to the bottom surface through the ground positioning part to balance the drilling reaction force.

[0028] S200: According to the pile diameter to be measured point depth and the distance between the pile axis and the movable platform, the drilling angle is calculated, and the push cylinder is started to push the bearing plate obliquely until the above drilling angle is reached; At the same time, the angle adjusting knob in the diameter measuring probe claw is manually screwed to ensure that the isotopic injection hole and the radiation intensity sensing head are both horizontally oriented;

[0029] S300: Start the drilling drive assembly to control the rotation of the drilling drive motor, thereby sequentially driving the driving gear, the driven gear and the driving threaded sleeve to rotate, and the threaded drill rod of the drilling rod is threadedly connected in the driving threaded sleeve. Under the circumferential limiting block on the inner wall of the support seat and the circumferential limiting groove on the side wall of the drilling rod, the drilling rod is driven to be pushed forward;

[0030] S400: During the drilling process of the drilling rod, the pile body touch probe assembly at the front end thereof judges in real time whether the front is a high-pressure rotary jet pile by hardness measurement. Specifically, if the front of the drilling rod is soil, the push head slides a small amount into the conical end under the action of the strong spring, and this sliding amount can be measured by the magnetic distance measuring device and fed back to the drilling station to make the drilling drive assembly continue to advance. If the front of the drilling rod is a hard object such as a stone or a pile body, the push head slides into the conical end due to the insufficient push force of the strong spring against the push head of the hard object. When the magnetic distance measuring device senses the large sliding amount, the drilling drive assembly is controlled to stop drilling and wait for a fixed time. At this time, the spring force continuously acts on the front hard object through the push head and penetrates into the surface of the hard object to a certain depth, which is measured by the magnetic distance measuring device. Then, according to the principle that the surface indentation depth of different hardness materials is different under the same force and time, it can be judged whether the front hard object is a pile body. If it is a pile body, it indicates that the pile body has been reached at this position. Otherwise, the drilling drive assembly continues to drill until the pile body is reached.

[0031] S500: After the front end of the drilling rod reaches the pile body, the probe claw flattening assembly is started to extend the diameter measuring probe claw, and the thickness of the soil layer is indirectly detected according to the principle of radioactive isotope measurement.

[0032] Preferably, the S500 further comprises:

[0033] S501: Control the driving motor to rotate, thereby horizontally unfolding the diameter measuring probe claw installed in the claw slot under the joint action of the screw rod and link mechanism;

[0034] S502: The radioactive isotope solvent storage and release assembly in the drilling rod continuously outputs and releases the radioactive isotope solvent from the isotopic injection hole, and diffuses in the soil around the pile body for a certain period of time to complete uniform diffusion;

[0035] S503: start the radiation intensity sensing head, detect the radiation intensity in front of the diameter probe, and the low intensity indicates that the radioisotope dose is small, and then represents the low thickness of the front soil layer, and vice versa, indicating that the soil layer is thick; the process is calibrated by experiment in advance the relationship between the soil layer thickness and the radiation intensity, the soil layer thickness is inversely solved by means of the radiation intensity, and then the soil layer thickness is curve fitted, the diameter of the corresponding arc segment of the fitting curve is obtained, which represents the pile diameter.

[0036] Overall, compared with the prior art, the above technical solutions conceived by the present application can achieve the following beneficial effects:

[0037] 1. A high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle, to realize pile diameter measurement, the radioisotope solvent diffusion and radiation intensity sensing and diameter inverse calculation method are combined to realize non-contact lossless diameter measurement from point to plane. Specifically, after the drill rod touches the pile surface, the diameter probe is unfolded in time by means of the probe flat expansion assembly, and the radioisotope solvent is released, then the radiation intensity is sensed by the radiation intensity sensing head, and the pile body arc segment is fitted by means of the calibrated curve of soil layer thickness-radiation intensity, and the pile body diameter is indirectly calculated, which effectively improves the adaptability of pile diameter measurement. And the strong spring and internal thrust detection device are used to simulate the object hardness measurement method, to realize the effective identification of whether the hard object at the front end of the drill rod is the pile body during drilling, and improve the information clarity of the underground drilling condition.

[0038] 2. A high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle, based on the inclined in-situ sounding method, the mobile platform, the drilling driving assembly and the inclined support assembly are combined to form a drilling platform, the drill rod is inclined to penetrate into the soil layer by means of the drilling platform, and the underground high-pressure rotary jet pile side wall is touched to realize the fixed depth point pile diameter measurement. Compared with the prior art, this method does not damage the pile body itself, ensures the original strength of the pile body, and optimizes the traditional pile body diameter measurement method. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 It is an application state schematic diagram of the high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle of the embodiment of the present application.

[0040] Figure 2 It is a radioisotope injection state diagram of the high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle of the embodiment of the present application.

[0041] Figure 3 It is a whole structure diagram of the high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle of the embodiment of the present application.

[0042] Figure 4A drilling station structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0043] Figure 5 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0044] Figure 6 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0045] Figure 7 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0046] Figure 8 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0047] Figure 9 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0048] Figure 10 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0049] Figure 11 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0050] Figure 12 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0051] Figure 13 A drilling rod front end structure schematic view of a high-pressure rotary jet grouting pile diameter detection system based on the isotopic thickness measurement principle according to an embodiment of the present application;

[0052] In all the drawings, the same reference signs refer to the same technical features, specifically: 1 - high-pressure jet grouting pile, 2 - drilling rod, 210 - threaded drill rod, 220 - pile body sounding assembly, 221 - conical end, 222 - pushing head, 223 - strong spring, 224 - magnetic sheet, 225 - magnetic force range finder, 230 - pile diameter detection assembly, 231 - claw closing groove, 232 - claw opening sliding groove, 233 - diameter detection claw, 2331 - sliding shaft, 2332 - mounting inner cavity, 2333 - diameter detection carrier, 2334 - angle adjustment knob, 2335 - isotope injection hole, 2336 - radiation intensity sensing head, 234 - claw flattening assembly, 2341 - driving motor, 2342 - double-pitch screw rod, 23421 - first rod segment, 23422 - second rod segment, 2343 - outer end pushing block, 2344 - outer end pushing rod, 2345 - inner end pushing block, 2346 - inner end pushing rod, 3 - drilling station, 300 - mobile carrier, 310 - ground positioning part, 320 - inclined support assembly, 321 - pushing cylinder, 322 - pushing rod, 323 - inclination disc, 324 - bearing plate, 330 - drilling driving assembly, 331 - drilling driving motor, 332 - driving gear, 333 - driven gear, 334 - driving threaded sleeve, 335 - bearing seat, 336 - support seat, 337 - circumferential limiting block, 338 - circumferential limiting groove. DETAILED DESCRIPTION

[0053] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship shown in the drawings, which are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0054] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0055] In this application, unless otherwise clearly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and other terms should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0056] In order to make the purpose, technical scheme and advantages of the present application more clear, the present application is further described in detail below in combination with the drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application, and are not used to limit the present application. In addition, the technical features involved in each embodiment of the present application described below can be combined with each other as long as they do not conflict with each other.

[0057] As shown in the drawings, Figures 1-13 In the embodiment of the present application, the high-pressure rotary jet pile diameter detection system based on the principle of isotope thickness measurement comprises:

[0058] The drill rod 2 is used to reach the sidewall of the underground high-pressure rotary jet pile and measure the pile diameter, which comprises a threaded drill rod 210, a pile body touch probe assembly 220 arranged at the front end of the threaded drill rod 210, and a pile diameter detection assembly 230; the pile diameter detection assembly 230 comprises a claw closing groove 231 opened in the sidewall of the front end of the drill rod 2, a claw opening sliding groove 232 opened in the sidewall of the claw closing groove 231, a diameter measuring probe claw 233 closed into the claw closing groove 231 and slidingly connected with the claw opening sliding groove 232, a probe claw flat assembly 234 for controlling the diameter measuring probe claw 233 to extend and close, and a radioactive isotope solvent storage and release assembly arranged in the drill rod 2;

[0059] The drilling station 3 is used to push the drill rod 2 into the soil layer, which comprises a movable platform 300, a ground positioning part 310 arranged around the movable platform 300, an inclined support assembly 320 arranged above the movable platform 300, and a drilling driving assembly 330 arranged at the output end of the inclined support assembly 320 for driving the drill rod 2 to push forward;

[0060] As shown in the drawings, Figure 3 And Figure 5 In the embodiment of the present application, the pile body touch probe assembly 220 comprises:

[0061] The conical end 221 at the front end of the drill rod 2, the push head 222 axially slidingly arranged at the center of the conical end 221, the strong spring arranged at the rear end of the push head 222, and the distance measuring assembly for measuring the retraction amount of the push head 222.

[0062] As Figure 5 shown in the embodiment of the present application, the distance measuring assembly comprises a magnetic sheet 224 arranged on the inner end surface of the pushing head 222, and a magnetic force distance measuring device 225 arranged on the inner end surface of the center sliding groove of the tapered end 221.

[0063] As Figures 7-9 shown in the embodiment of the present application, the diameter measuring probe claw 233 comprises:

[0064] A sliding shaft 2331 is arranged at one end of the diameter measuring probe claw 233 and is in sliding connection with the claw spreading sliding groove 232.

[0065] An isotope injection hole 2335 is arranged on the front side surface of the diameter measuring probe claw 233, and is used to release radioactive isotope solvent around the pile body under the control of the radioactive isotope solvent storage and release assembly, and to complete uniform diffusion by itself.

[0066] A radiation intensity sensing head 2336 is arranged on the front side surface of the diameter measuring probe claw 233, and is used to sense the radiation intensity in front of the diameter measuring probe claw 233.

[0067] A direction adjusting assembly is used to adjust the direction of the isotope injection hole 2335 and the radiation intensity sensing head 2336.

[0068] As Figure 7 shown in the embodiment of the present application, the direction adjusting assembly comprises:

[0069] An installation inner cavity 2332 is opened on the side surface of the diameter measuring probe claw 233, a diameter measuring carrier 2333 is coaxially arranged and rotationally installed in the installation inner cavity 2332, and an angle adjusting knob 2334 is used to adjust the axial angle of the diameter measuring carrier 2333 and the diameter measuring probe claw 233; the isotope injection hole 2335 and the radiation intensity sensing head 2336 are arranged on the front side surface of the diameter measuring carrier 2333.

[0070] As Figures 8-10 shown in the embodiment of the present application, the probe claw flattening assembly 234 comprises:

[0071] A driving motor 2341 is arranged in the drilling rod 2, a double-pitch screw rod 2342 is fixedly connected coaxially with the driving motor 2341, a first rod segment 23421 and a second rod segment 23421 are divided according to different pitches of the double-pitch screw rod 2342, an outer end spreading block 2343 and an inner end front pushing block 2345 are respectively in threaded connection with the first rod segment 23421 and the second rod segment 23421, an outer end spreading rod 2344 is rotationally connected between the diameter measuring probe claw and the outer end spreading block 2343, and an inner end front pushing rod 2346 is rotationally connected between the diameter measuring probe claw and the inner end front pushing block 2345.

[0072] As Figure 3 In the embodiment of the present application, the oblique supporting assembly 320 comprises:

[0073] The thrusting cylinder 321 is hinged to the movable platform 300, the bearing plate 324 is rotatably connected to the extending rod end of the thrusting cylinder 321, and the inclination disc 323 is arranged on the upper surface of the movable platform 300; the drilling driving assembly is installed on the upper surface of the bearing plate 324; and one side edge of the bearing plate 324 is hinged to the upper surface of the movable platform 300.

[0074] As Figure 3 and Figure 4 In the embodiment of the present application, the drilling driving assembly 330 comprises:

[0075] The drilling driving motor 331, the driving gear 332 coaxially fixedly connected to the output shaft of the drilling driving motor 331, the driven gear 333 meshingly connected to the driving gear 332, the driving threaded sleeve 334 coaxially fixedly connected to the driven gear 333, the bearing seat 335 supporting the rotation of the driving threaded sleeve 334, and the support seat 336 coaxially fixedly arranged on the upper surface of the bearing plate 324.

[0076] The circumferential limiting block 337 is arranged on the inner surface of the support seat 336, and the circumferential limiting groove 338 is arranged on the side wall of the threaded drill rod 210; and the circumferential limiting block 337 and the circumferential limiting groove 338 are in sliding connection.

[0077] In the embodiment of the present application, a use method of a high-pressure rotary jet pile diameter detection system based on the isotopic thickness measurement principle comprises the following steps:

[0078] S100: First, the system is moved to the target construction site by the movable platform 300, and the movable platform 300 is fixed to the bottom surface by the ground positioning part 310 to balance the drilling reaction force.

[0079] S200: According to the depth of the pile diameter to be measured and the distance between the pile axis and the movable platform 300, the drilling inclination is calculated, and the thrusting cylinder 321 is started to thrust to obliquely lift the bearing plate 324 until the above-mentioned drilling inclination is reached; at the same time, the angle adjustment knob 2334 in the diameter measurement probe claw 233 is manually screwed to ensure that the isotopic injection hole 2335 and the radiation intensity sensing head 2336 are both horizontally oriented.

[0080] S300: start the drilling driving assembly 330, control the drilling driving motor 331 to rotate, thereby sequentially driving the driving gear 332, the driven gear 333 and the driving threaded sleeve 334 to rotate, the threaded drill rod 210 of the drilling rod 2 is threadedly connected in the driving threaded sleeve 334, under the circumferential limiting block 337 on the inner wall of the support seat 336 and the circumferential limiting groove 338 on the side wall of the drilling rod 2, the drilling rod 2 is driven to be pushed forward;

[0081] S400: in the drilling process of the drilling rod 2, the pile body touch probe assembly 220 at the front end is used to judge whether the front is a high-pressure rotary jet pile by hardness measurement method; specifically, if the front of the drilling rod 2 is soil, the push head 222 slides a small amount to the inside of the conical end 221 under the action of the strong spring 223, the sliding amount can be measured by the magnetic distance measuring device 225 and fed back to the drilling station 3, so that the drilling driving assembly 330 continues to advance; if the front of the drilling rod 2 is a hard object such as a stone or a pile body, the strong spring 223 is not enough to push the push head 222 back to the hard object, so the push head 222 slides to the inside of the conical end 221, when the magnetic distance measuring device 225 senses the large sliding amount, the drilling driving assembly 330 is controlled to stop drilling and wait for a fixed time, at this time, the strong spring 223 continuously applies the elastic force to the front hard object through the push head 222 and presses into the surface of the hard object to a certain depth, which is measured by the magnetic distance measuring device 225, then, according to the principle that the surface indentation depth of different hardness objects is different under the same action force and the same action time, it can be judged whether the front hard object is a pile body; if it is a pile body, it indicates that the pile body has been reached, otherwise, the drilling driving assembly 330 continues to drill;

[0082] S500: when the front end of the drilling rod 2 reaches the pile body, the probe claw flattening assembly 234 is started, the diameter measuring probe claw 233 is stretched out, and the diameter of the pile is indirectly detected by means of the principle of radioactive isotope measurement of permeable soil thickness.

[0083] As shown in the embodiment of the application, the S500 further comprises: Figures 11-13

[0084] S501: control the driving motor 2341 to rotate, thereby horizontally unfolding the diameter measuring probe claw 233 installed in the claw collecting groove 231 under the joint action of the screw and sliding block mechanism and the connecting rod mechanism;

[0085] S502: radioactive isotope solvent storage and release assembly in the drilling rod 2 continuously outputs and releases radioactive isotope solvent from the isotope injection hole 2335, and diffuses in the soil around the pile body and lasts for a certain time to complete uniform diffusion;

[0086] ​S503: start the radiation intensity sensor 2336, detect the radiation intensity in front of the diameter probe, low intensity indicates less radioisotope dose, and thus represents the low thickness of the front soil layer, and vice versa, indicating the thickness of the soil layer; the process is calibrated by experiment in advance the relationship between soil layer thickness and radiation intensity, and the soil layer thickness is inversely solved by means of radiation intensity, and then the soil layer thickness is curve fitted, and the diameter of the corresponding arc segment of the fitting curve can represent the pile diameter.

[0087] In the embodiment of the present application, based on the inclined in-situ sounding method, the mobile platform 300, the drilling driving assembly 330 and the inclined support assembly 320 are integrated to form a drilling platform, which is used to drive the drilling rod into the soil layer at an angle and touch the sidewall of the underground high-pressure jet grouting pile to realize the depth point pile diameter measurement. Compared with the prior art, the present method does not damage the pile itself, ensures the original strength of the pile, and optimizes the traditional pile diameter measurement method.

[0088] In addition, in the embodiment of the present application, a strong spring and an internal thrust detection device are used to simulate the hardness measurement method of the object, so as to effectively identify whether the hard object at the front end of the drill rod is a pile during drilling, and improve the information clarity of the underground drilling condition.

[0089] In addition, in the embodiment of the present application, in order to realize pile diameter measurement, radioactive isotope solvent diffusion and radiation intensity sensing and diameter inverse calculation method are integrated to realize point-to-plane non-contact lossless diameter measurement. Specifically, after the drilling rod touches the surface of the pile, the diameter probe 233 is expanded in time by the probe flat expansion assembly 234, and the radioactive isotope solvent is released, and then the radiation intensity is sensed by the radiation intensity sensor, and the pile diameter is indirectly calculated by fitting the pile arc segment based on the calibrated curve of soil layer thickness-radiation intensity, thereby effectively improving the adaptability of pile diameter measurement.

[0090] The above is only a preferred embodiment of the present application, and does not limit the present application. Any modification, equivalent replacement and improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application. The above is only a preferred embodiment of the present application, and it should be pointed out that for ordinary skilled in the art, without departing from the technical principles of the present application, a number of improvements and modifications can be made, which should be regarded as the protection scope of the present application.

Claims

1. A high-pressure jet grouting pile diameter detection system based on the principle of isotope thickness measurement, characterized in that, It includes: Drilling rod (2) for reaching underground high pressure rotary jet pile side wall and measuring its pile diameter, which includes threaded drill rod (210), pile body sounding assembly (220) and pile diameter detection assembly (230) arranged at the front end of the threaded drill rod (210); The pile diameter detection assembly (230) includes a claw slot (231) opened in the front end side wall of the drilling rod (2), an expansion claw sliding groove (232) opened in the side wall of the claw slot (231), a diameter detection probe claw (233) retracted into the claw slot (231) and slidingly connected with the expansion claw sliding groove (232), a probe claw flat assembly (234) for controlling the expansion and retraction of the diameter detection probe claw (233), and a radioactive isotope solvent storage and release assembly arranged in the drilling rod (2); Drilling platform (3) for pushing the drilling rod (2) into the soil layer, which includes a movable platform (300), a ground positioning part (310) arranged around the movable platform (300), an inclined support assembly (320) arranged above the movable platform (300), and a drilling driving assembly (330) arranged at the output end of the inclined support assembly (320) for driving the drilling rod (2) to push forward.

2. The high pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 1, the pile body sounding assembly (220) comprising: a conical end (221) at the front end of the drilling rod (2), a push head (222) axially slidingly arranged at the center of the conical end (221), a strong spring arranged at the rear end of the push head (222), and a distance measuring assembly for measuring the retraction amount of the push head (222).

3. The high-pressure jet grouting pile diameter detection system based on the principle of isotope thickness measurement according to claim 2, the ranging assembly comprising: A magnetic sheet (224) arranged on the inner end surface of the push head (222), and a magnetic distance measuring device (225) arranged on the inner end surface of the center sliding groove of the conical end (221).

4. The high pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 1, the diameter detection probe claw (233) comprising: a sliding shaft (2331) arranged at one end of the diameter detection probe claw (233) and slidingly connected with the expansion claw sliding groove (232); An isotope injection hole (2335) arranged on the front side of the diameter detection probe claw (233) for releasing radioactive isotope solvent around the pile body under the control of the radioactive isotope solvent storage and release assembly, and uniformly diffusing by itself; A radiation intensity sensing head (2336) arranged on the front side of the diameter detection probe claw (233) for sensing the radiation intensity in front of the diameter detection probe claw (233); An orientation adjusting assembly for adjusting the orientation of the isotope injection hole (2335) and the radiation intensity sensing head (2336).

5. The high pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 4, the orientation adjusting assembly comprising: An installation inner cavity (2332) is opened in the side surface of the caliper probe (233), a caliper carrier (2333) is rotationally installed in the installation inner cavity (2332) in a coaxial direction with the caliper probe (233), an angle adjustment knob (2334) is used to adjust the axial angle between the caliper carrier (2333) and the caliper probe (233); the isotope injection hole (2335) and the radiation intensity sensing head (2336) are installed on the front surface of the caliper carrier (2333).

6. The high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 1, wherein the probe flat expansion assembly (234) comprises: A driving motor (2341) is arranged in the drilling rod (2), a double-pitch screw rod (2342) is fixedly connected coaxially with the driving motor (2341), a first rod segment (23421) and a second rod segment (23421) are divided according to different pitches of the double-pitch screw rod (2342), an outer end expansion block (2343) and an inner end forward pushing block (2345) are respectively threadedly connected with the first rod segment (23421) and the second rod segment (23422), an outer end expansion rod (2344) is rotationally connected between the outer end of the caliper probe and the outer end expansion block (2343), and an inner end forward pushing rod (2346) is rotationally connected between the inner end of the caliper probe and the inner end forward pushing block (2345).

7. The high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 1, wherein the inclined support assembly (320) comprises: A pushing air cylinder (321) is hingedly connected to the movable platform (300), a bearing plate (324) is rotationally connected to the extending rod end of the pushing air cylinder (321), and an inclination disc (323) is arranged on the upper surface of the movable platform (300); the drilling driving assembly is installed on the upper surface of the bearing plate (324); one side edge of the bearing plate (324) is hingedly connected to the upper surface of the movable platform (300).

8. The high-pressure rotary jet pile diameter detection system based on the isotope thickness measurement principle according to claim 1, wherein the drilling driving assembly (330) comprises: A drilling driving motor (331), a driving gear (332) fixedly connected coaxially with the output shaft of the drilling driving motor (331), a driven gear (333) meshingly connected with the driving gear (332), a driving threaded sleeve (334) fixedly connected coaxially with the driven gear (333), a bearing seat (335) supporting the rotation of the driving threaded sleeve (334), and a support seat (336) fixedly connected coaxially with the bearing seat (335) on the upper surface of the bearing plate (324); A circumferential limiting block (337) is arranged on the inner surface of the support seat (336), and a circumferential limiting groove (338) is opened in the side wall of the threaded drill rod (210); the circumferential limiting block (337) and the circumferential limiting groove (338) are in sliding connection.

9. The use method of the high-pressure rotary jet pile diameter detection system based on the isotopic thickness measurement principle according to any one of claims 1-8, comprising the following steps: S100: first, the system as a whole is moved to the target construction site by the mobile carrier (300), and the mobile carrier (300) is fixed to the bottom surface by the ground positioning part (310) to balance the drilling reaction force; S200: according to the depth of the pile diameter to be measured and the distance between the pile axis and the mobile carrier (300), the drilling inclination angle is calculated, and the push gas cylinder (321) is started to push the load plate (324) obliquely upwards until the above-mentioned drilling inclination angle is reached; at the same time, the angle adjustment knob (2334) in the diameter measurement probe claw (233) is manually screwed to ensure that the isotopic injection hole (2335) and the radioactivity intensity sensing head (2336) are both horizontally oriented; S300: the drilling drive assembly (330) is started, and the drilling drive motor (331) is controlled to rotate, thereby sequentially driving the driving gear (332), the driven gear (333) and the driving threaded sleeve (334) to rotate, the threaded drill rod (210) of the drilling rod (2) is threadedly connected in the driving threaded sleeve (334), and under the circumferential limiting block (337) on the inner wall of the support seat (336) and the circumferential limiting groove (338) on the side wall of the drilling rod (2), the drilling rod (2) is driven to be pushed forward; S400: during the drilling process of the drilling rod (2), the pile body touch probe assembly (220) at the front end thereof judges in real time whether the front is a high-pressure rotary jet pile by hardness measurement; specifically, if the front of the drilling rod (2) is soil, the push head (222) slides a small amount into the conical end (221) under the action of the strong spring (223), the sliding amount can be measured by the magnetic distance meter (225) and fed back to the drilling station (3), so that the drilling drive assembly (330) continues to advance; if the front of the drilling rod (2) is a hard object such as a stone or a pile body, the strong spring (223) is not strong enough to push the push head (222) back due to the insufficient pushing force of the strong spring (223) on the hard object, and the push head (222) slides into the conical end (221); when the magnetic distance meter (225) senses the large sliding amount, the drilling drive assembly (330) is stopped and waits for a fixed time, at which time the strong spring (223) continuously applies the elastic force to the front hard object through the push head (222) and presses into the surface of the hard object to a certain depth, which is measured by the magnetic distance meter (225); then, according to the principle that the surface indentation depth of different hardness materials is different under the same force and time, it can be judged whether the front hard object is a pile body; if it is a pile body, it indicates that the pile body has been reached at this position, otherwise, the drilling drive assembly (330) continues to drill until the pile body is reached; S500: after the front end of the drilling rod (2) reaches the pile body, the probe claw flattening assembly (234) is started to stretch the diameter measurement probe claw (233), and the pile diameter detection is indirectly completed by means of the radioactive isotopic measurement penetration soil thickness principle.

10. The method of claim 9, wherein the S500 further comprises: S501: controlling the driving motor (2341) to rotate, thereby expanding the diameter measuring probe claw (233) installed in the claw slot (231) horizontally under the joint action of the screw slide mechanism and the connecting rod mechanism; S502: continuously outputting and releasing the radioactive isotope solvent from the isotope injection hole (2335) through the radioactive isotope solvent storage and release assembly in the drilling rod (2), and diffusing in the soil around the pile body for a certain period of time to complete uniform diffusion; S503: starting the radiation intensity sensing head (2336) to detect the radiation intensity in front of the diameter measuring probe claw, and the low intensity indicates that the radioactive isotope dose is small, and in turn represents that the front soil layer thickness is low, and vice versa, indicating that the soil layer thickness is large; the relationship between the soil layer thickness and the radiation intensity is calibrated in advance through the test, the soil layer thickness is inversely solved by means of the radiation intensity, and in turn the soil layer thickness is curve-fitted, and the diameter of the corresponding arc segment of the fitted curve can represent the pile diameter.

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