Pipe orifice pulley detection device and detection method suitable for acoustic transmission method

Abstract

The invention relates to the technical field of pile foundation detection, in particular to a pipe orifice pulley detection device and method suitable for a sound wave transmission method, and the device comprises a pipe orifice pile casing, a double-track pedometer, a laser ranging device, an automatic pay-off device, an automatic take-up device, an ultrasonic probe and an integrated control system; and the two electric rollers are respectively used for paying off and taking up. The device can realize automatic measurement of pipe orifice spacing, automatic pay-off, recording of effective detection length of a pile foundation, automatic take-up and real-time recording of step length. By integrating the functions of distance measurement, electric take-up and pay-off, synchronous step counting and the like, the adaptability, convenience and data accuracy of field detection are effectively improved, and reliable technical support is provided for foundation quality detection of extra-high voltage engineering and the like. According to the invention, the detection convenience of a sound wave transmission method is effectively improved, and the accuracy and reliability of field detection data are enhanced.

Description

Technical Field

[0001] This invention relates to the field of pile foundation testing technology, and in particular to a pipe end pulley testing device and testing method suitable for acoustic transmission method. Background Technology

[0002] To implement the "dual-carbon" strategy, the construction of clean energy bases, primarily based on wind, solar, and hydropower, is being accelerated. To ensure the safe, stable, and efficient transmission of clean electricity, accelerating the construction of ultra-high-voltage (UHV) transmission projects has become an essential measure for achieving optimal cross-regional energy allocation. Taking a certain UHVDC transmission project as an example, this project, as a key channel, undertakes the important mission of transmitting clean hydropower from location A to the load center in location B over long distances.

[0003] Ultra-high voltage (UHV) transmission line projects mainly consist of three stages: foundation construction, tower erection, and line stringing. Foundation construction is fundamental to ensuring the long-term safe and stable operation of the line. However, UHV lines, exemplified by a certain project, traverse complex terrain areas such as the Hengduan Mountains and plateaus, with tower foundations often located in harsh geological environments such as steep slopes and canyons. In actual testing, traditional methods face numerous difficulties: in steep terrain around the piles, setting up tripods on-site is extremely difficult and provides unstable support; the large exposed height of the pile head results in high labor intensity and low efficiency for manual wire laying and winding; the measuring line is prone to jamming and wear, leading to large step-counting errors; and key parameters such as pile spacing and elevation difference rely on manual measurement, directly affecting the accuracy of effective pile length calculation and sound velocity calibration.

[0004] Therefore, traditional detection methods suffer from problems such as poor adaptability, low efficiency, and insufficient data reliability. Summary of the Invention

[0005] The purpose of this invention is to provide a pipe end pulley detection device and detection method suitable for acoustic transmission method, which can solve the technical problems of poor adaptability, low efficiency and insufficient data reliability of traditional detection methods.

[0006] To achieve the above objectives, the present invention provides the following technical solution: This invention designs a pipe end pulley detection device suitable for acoustic transmission method, comprising: a pipe end sleeve, a dual-track pedometer, a laser rangefinder, an automatic wire feeding device, an automatic wire take-up device, an ultrasonic probe, and an integrated control system; The pipe end sleeve is arranged inside the sonic logging pipe, and the upper end of the pipe end sleeve extends to the outside of the sonic logging pipe. The laser ranging device is arranged on the pipe end sleeve and is used to measure the distance between the two pipe ends and the exposed length of the acoustic logging pipe. One end of the ultrasonic probe is connected to the automatic wire laying device, and the other end extends into the pipe end sleeve and into the sonic logging tube. The ultrasonic probe is used to detect the integrity of the pile foundation by transmitting and receiving signals. The dual-track pedometer is electrically connected to the integrated control system, the automatic wire feeding device, and the automatic wire take-up device, respectively, and is used to record the wire feeding length and detect the step length in real time. The automatic line-laying device is used to measure the effective detection length of the pile foundation.

[0007] As a preferred embodiment, the automatic wire feeding device includes a wire feeding roller, a wire feeding mounting frame, and a wire feeding roller adjuster. The wire feeding roller adjuster is arranged inside the pipe end sleeve. The wire feeding mounting frame is connected to the wire feeding roller adjuster via a spring. The wire feeding roller is arranged inside the wire feeding mounting frame via a rotating shaft.

[0008] Furthermore, there are two automatic wire feeding devices, symmetrically arranged inside the pipe end sleeve.

[0009] As a preferred embodiment, the automatic take-up device includes a take-up roller, a take-up mounting frame, and a take-up roller adjuster. The take-up roller adjuster is arranged outside the tube end sleeve. The take-up mounting frame is connected to the take-up roller adjuster via a spring. The take-up roller is arranged inside the take-up mounting frame via a rotating shaft.

[0010] Furthermore, there are two automatic take-up devices, symmetrically arranged on the outside of the pipe end sleeve.

[0011] As a preferred embodiment, the laser ranging device includes a laser ranging sensor and a telescopic rod, wherein the telescopic rod is connected to the laser ranging sensor and is used to adjust the height of the laser sensor.

[0012] Furthermore, there are two laser ranging sensors, which are respectively arranged at the upper and lower ends of the pipe end sleeve. The upper laser ranging sensor is used to measure the distance between the two pipe ends, and the lower laser ranging sensor is used to measure the exposed length of the acoustic logging pipe.

[0013] This invention also designs a pipe end pulley detection method suitable for acoustic transmission method, and applies the above-mentioned pipe end pulley detection device suitable for acoustic transmission method, including the following steps: Install the pipe end pulley detection device inside the acoustic tube; The telescopic rods are adjusted synchronously to ensure there are no obstructions between the upper laser rangefinders; The straight-line distance between the protective sleeves at each pipe opening is measured using the upper laser rangefinder sensor. The exposed length L of the acoustic logging tube is measured using a lower laser rangefinder. Wrap the measuring line around the dual-track pedometer and clamp it in place; Start the automatic line laying device, and place the ultrasonic probe through the pipe end casing and sonic logging tube to the bottom of the pile foundation. The line laying length S is measured by the dual-track pedometer. The effective detection length X of the pile foundation is calculated based on the relationship between the exposed length L of the sonic logging tube and the length D of the ultrasonic probe. The automatic line retraction device is activated to retrieve the measuring line at a constant speed. The dual-track pedometer and the main unit record the pile foundation detection position and corresponding data in real time until the effective detection length of the pile foundation is displayed as zero on the main unit, at which point the line retraction stops.

[0014] As a preferred approach, the effective inspection length X of the pile foundation is calculated, including the following cases: When L≥D, the effective test length of the pile foundation is X=S-(LD)=S-L+D; When L < D, the effective test length of the pile foundation is X = S - (DL) = S - D + L.

[0015] The beneficial effects of this invention are: This invention proposes a multifunctional pipe end pulley detection device and its detection method suitable for acoustic transmission method. The device includes: a pipe end sleeve, a dual-track pedometer, a laser rangefinder, an automatic wire feeding device, an automatic wire take-up device, an ultrasonic probe, and an integrated control system; two electric rollers are used for wire feeding and wire take-up respectively.

[0016] This invention enables automatic measurement of pipe spacing, automatic laying out and recording of the effective inspection length of the pile foundation, automatic reeling in of the line and real-time recording of the step length. By integrating functions such as distance measurement, electric line laying and reeling in, and synchronous step counting, it effectively improves the adaptability, convenience, and data accuracy of on-site inspection, providing reliable technical support for the foundation quality inspection of ultra-high voltage projects.

[0017] This invention effectively improves the convenience of acoustic transmission method detection and enhances the accuracy and reliability of on-site detection data. Attached Figure Description

[0018] Figure 1 This is a front view of the pipe opening pulley detection device of the present invention.

[0019] Figure 2 This is a top view of the pipe opening pulley detection device of the present invention.

[0020] Figure 3 This is a schematic diagram of the operation of the pipe pulley detection device of the present invention.

[0021] In the picture: 1-Dual-track pedometer, 4-Main unit connection port, 9-Line reel, 10-Ultrasonic probe, 11-Measuring line, 12-Pipe end sleeve, 13-Sonic logging pipe, 14-Pile foundation; Laser ranging device (51-upper laser ranging sensor, 52-lower laser ranging sensor, 6-telescopic rod); Automatic wire feeding device (3-wire feeding roller, 31-wire feeding roller adjuster, 32-wire feeding mounting frame, 8-spring); Automatic take-up device (2-take-up roller, 21-take-up roller adjuster, 22-take-up mounting frame). Detailed Implementation

[0022] To make the technical problems solved by the present invention, the technical solutions adopted, and the technical effects achieved clearer, the technical solutions of the present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only for explaining the present invention and not for limiting the present invention. Furthermore, it should be noted that, for ease of description, only the parts related to the present invention are shown in the accompanying drawings, not all of them.

[0023] In the description of this invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0024] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art can understand the specific meaning of these terms in this invention based on the specific circumstances.

[0025] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of the invention include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0026] This invention relates to a pipe end pulley detection device and method suitable for acoustic transmission method. Addressing the problems of poor adaptability, low efficiency, and insufficient data reliability of traditional detection methods under complex working conditions, this invention proposes a multifunctional pipe end pulley detection device and method suitable for acoustic transmission method. The device includes a laser rangefinder, a dual-track pedometer, two electric rollers, and a pipe end casing. The two electric rollers are used for laying and retrieving the wire, respectively. This invention can automatically measure the pipe end spacing, automatically lay out the wire and record the effective detection length of the pile foundation, and automatically retrieve the wire and record the step length in real time. By integrating rangefinding, electric wire laying and retrieving, and synchronous step counting functions, it effectively improves the adaptability, convenience, and data accuracy of on-site detection, providing reliable technical support for the foundation quality inspection of projects such as UHV power transmission.

[0027] This invention provides a pipe end pulley detection device suitable for acoustic transmission method, comprising: a pipe end sleeve 12, a dual-track pedometer 1, a laser rangefinder, an automatic wire feeding device, an automatic wire taking-up device, an ultrasonic probe 10, and an integrated control system. The pipe end sleeve 12 is arranged inside the sonic logging pipe 13, and the upper end of the pipe end sleeve 12 extends to the outside of the sonic logging pipe 13. The laser ranging device is arranged on the pipe end sleeve 12 and is used to measure the distance between the two pipe ends and the exposed length of the acoustic logging pipe 13. One end of the ultrasonic probe 10 is connected to the automatic wire laying device, and the other end extends into the pipe end sleeve 12 and into the acoustic tube 13. The ultrasonic probe 10 is used to detect the integrity of the pile foundation by transmitting and receiving signals. The dual-track pedometer 1 is electrically connected to the integrated control system, the automatic wire feeding device, and the automatic wire take-up device, respectively, and is used to record the wire feeding length and detect the step length in real time. The automatic line-laying device is used to measure the effective detection length of the pile foundation.

[0028] In one embodiment, the automatic wire feeding device includes a wire feeding roller 3, a wire feeding mounting frame 32, and a wire feeding roller adjuster 31. The wire feeding roller adjuster 31 is arranged inside the pipe end sleeve 12. The wire feeding mounting frame 32 is connected to the wire feeding roller adjuster 31 by a spring. The wire feeding roller 3 is arranged inside the wire feeding mounting frame 32 by a rotating shaft.

[0029] In specific applications, there are two automatic wire feeding devices, symmetrically arranged inside the pipe end sleeve 12.

[0030] In one embodiment, the automatic take-up device includes a take-up roller 2, a take-up mounting frame 22, and a take-up roller adjuster 21. The take-up roller adjuster 21 is arranged outside the tube end sleeve 12. The take-up mounting frame 22 is connected to the take-up roller adjuster 21 by a spring. The take-up roller 2 is arranged inside the take-up mounting frame 22 by a rotating shaft.

[0031] In specific applications, there are two automatic take-up devices, symmetrically arranged on the outside of the pipe end sleeve 12.

[0032] In one embodiment, the laser ranging device includes a laser ranging sensor and a telescopic rod 6, the telescopic rod 6 being connected to the laser ranging sensor and used to adjust the height of the laser sensor.

[0033] In specific applications, there are two laser ranging sensors, which are respectively arranged at the upper and lower ends of the pipe end sleeve 12. The upper laser ranging sensor 51 is used to measure the distance between the two pipe ends, and the lower laser ranging sensor 52 is used to measure the exposed length of the acoustic tube 13.

[0034] The present invention also provides a method for detecting pipe end pulleys using the acoustic transmission method, applied to the aforementioned pipe end pulley detection device using the acoustic transmission method, comprising the following steps: Install the pipe end pulley detection device inside the acoustic tube; The telescopic rods are adjusted synchronously to ensure there are no obstructions between the upper laser rangefinders; The straight-line distance between the protective sleeves at each pipe opening is measured using the upper laser rangefinder sensor. The exposed length L of the acoustic logging tube is measured using a lower laser rangefinder. Wrap the measuring line around the dual-track pedometer and clamp it in place; Start the automatic line laying device, and place the ultrasonic probe 10 through the pipe end sleeve 12 and the sonic logging tube 13 to the bottom of the pile foundation. The line laying length S is measured by the dual-track pedometer. The effective detection length X of the pile foundation is calculated based on the relationship between the exposed length L of the sonic logging tube and the length D of the ultrasonic probe. The automatic line retraction device is activated to retrieve the measuring line at a constant speed. The dual-track pedometer 1 and the main unit record the pile foundation detection position and corresponding data in real time until the effective detection length of the pile foundation is displayed as zero on the main unit, at which point the line retraction stops.

[0035] In one embodiment, calculating the effective detection length X of the pile foundation includes the following cases: When L≥D, the effective test length of the pile foundation is X=S-(LD)=S-L+D; When L < D, the effective test length of the pile foundation is X = S - (DL) = S - D + L.

[0036] It should be understood that the specific order or hierarchy of steps in the process disclosed in the present invention is an example of an exemplary method. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the process can be rearranged without departing from the scope of the present disclosure. The appended method claims present the elements of various steps in an exemplary order and are not limited to the specific order or hierarchy described.

[0037] As Figure 1-3 shown, a multifunctional pipe mouth pulley detection device applicable to the sonic transmission method provided by the present invention includes a laser ranging device, a double-track pedometer, an automatic wire releasing device, an automatic wire retracting device, and an integrated control system; and can realize functions such as automatic measurement of the pipe mouth spacing, automatic wire releasing and recording of the effective detection length of the pile foundation, automatic wire retracting and real-time recording of the step length, etc.

[0038] The double-track pedometer is electrically connected to the integrated control system, the automatic wire releasing device, and the automatic wire retracting device respectively, and can simultaneously realize functions of wire retracting, wire releasing, and step counting.

[0039] The laser ranging device includes a laser ranging sensor and a telescopic rod; at least two laser ranging sensors are respectively located above and at the bottom of the pipe mouth casing, and measure the distance between two pipe mouths and the exposed length of the acoustic logging tube by emitting light beams; the telescopic rod is connected to the top laser ranging sensor and can adjust the height of the laser sensor.

[0040] The automatic wire releasing device includes an electric wire releasing roller; the double-track pedometer is located directly above the pipe mouth casing, and the measuring wire can wind around the pedometer in one circle; the electric wire releasing roller is composed of a spring, a roller regulator, and a roller with a rough surface, is located below the pedometer, and is located inside the pipe mouth casing.

[0041] The automatic wire retracting device includes an electric wire retracting roller; the compositions of the double-track pedometer and the electric wire retracting roller are the same as those described above; the electric wire retracting roller is located below the double-track pedometer and is located inside the pipe mouth casing.

[0042] The integrated control system is a control program supporting in the sonic detection host, and includes functions such as automatically inputting the pipe mouth spacing through the laser ranging sensor, starting, closing, and regulating the speed of the wire releasing and electric wire retracting rollers, accurately calculating the effective detection pile length, and real-time recording of the wire retracting step length; the integrated control system is controlled by being wired-connected to the host through the pipe mouth pulley detection device.

[0043] As Figure 3 shown, the specific working process is as follows: Install the pipe-end pulley detection device inside the sonic logging pipe; adjust the telescopic rod 6 to ensure that all laser rangefinders are at the same height and unobstructed, and use the laser rangefinder 5 to automatically measure the straight-line distance between each pipe-end casing; simultaneously use the laser rangefinder 5 to measure the exposed length L of the sonic logging pipe; after wrapping the measuring line around the pedometer twice, start the electric roller telescopic device and clamp the measuring line; start the electric line-laying roller 3 to place the ultrasonic probe 10 to the bottom of the pile foundation, and accurately measure the line-laying length S using the dual-track pedometer 1; calculate the effective pile length based on the relationship between the exposed length L of the sonic logging pipe and the length D of the ultrasonic probe; start the electric line-retrieving roller 2 to synchronously and uniformly retrieve the measuring line, and record the detected length using the dual-track pedometer 1.

[0044] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0045] The on-site acoustic transmission method testing equipment includes a wire reel 9, a main unit, and the multifunctional pipe end pulley testing device of this invention.

[0046] Place the main unit and cable reel 9 on a flat open ground. When encountering a high exposed pile head or steep terrain around the pile, the main unit and cable reel 9 can be placed on top of the pile.

[0047] Place the multi-functional pipe port pulley detection device inside the sonic logging tube, and connect the main unit to the multi-functional pipe port pulley detection device via the main unit connection port 4 using a data cable.

[0048] Turn on the main unit; use the laser rangefinder 52 on the lower side of the tube end sleeve to measure the leakage length L of the acoustic tube and automatically record it into the main unit.

[0049] Adjust the telescopic rod 6 at the top of the pipe end sleeve to ensure there are no obstructions between the upper laser ranging sensors 51 above the pulley detection devices at each pipe end; activate the laser ranging function to automatically measure the distance between the cross sections of each pipe end sleeve and directly input it into the host system.

[0050] The ultrasonic probe 10 is placed inside the acoustic logging tube. Before starting, the ultrasonic probe 10 is placed at the top of the acoustic logging tube, and the measuring line is wrapped around the dual-track pedometer 1 and tightened. Then, the electric take-up roller and electric release roller are controlled in the main unit, and a certain force is applied to the measuring lines at both ends through the electric roller adjuster 7. Then, the ultrasonic probe 10 is made to fall along the acoustic logging tube to the bottom of the pile foundation under its own weight. The dual-track pedometer records the falling length of the ultrasonic probe 10, that is, the release length S.

[0051] When the exposed length L of the sonic logging tube is greater than or equal to the length D of the ultrasonic probe (L≥D), the effective detection length of the pile foundation is X=S-(LD)=S-L+D. When the exposed length L of the sonic logging tube is less than the length D of the ultrasonic probe (L < D), the effective detection length X of the pile foundation is X = S - (DL) = S - D + L.

[0052] The measurement and calculation process is automatically completed by the host computer's internal program, which can directly output the effective detection length X of the pile foundation.

[0053] Start the ultrasonic probe; start the electric take-up roller adjuster to apply greater force to the outer measuring line; control the take-up speed of the electric take-up roller 2 through the main unit so that each ultrasonic probe rises at a uniform speed; at the same time, the dual-track pedometer 1 and the main unit record the pile foundation detection position and corresponding data in real time; until the effective detection length of the pile foundation is displayed as zero in the main unit, the electric take-up roller 2 automatically stops and automatically saves the detection file.

[0054] This invention effectively improves the convenience of acoustic transmission testing and enhances the accuracy and reliability of on-site testing data. By integrating functions such as ranging, electric cable winding and unwinding, and synchronous step counting, it effectively improves the adaptability, convenience, and data accuracy of on-site testing, providing reliable technical support for the foundation quality testing of ultra-high voltage projects.

[0055] All other parts not described herein belong to the prior art. The embodiments described above are merely illustrative of several implementations of the present invention, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make several modifications and improvements without departing from the concept of the present invention, and these all fall within the protection scope of the present invention. Therefore, the protection scope of this patent should be determined by the appended claims.

Claims

1. A pipe end pulley detection device suitable for acoustic transmission method, characterized in that, include: Pipe end sleeve (12), dual-track pedometer (1), laser rangefinder, automatic wire feeding device, automatic wire taking-up device, ultrasonic probe (10), integrated control system; The pipe end sleeve (12) is arranged inside the sonic logging pipe (13), and the upper end of the pipe end sleeve (12) extends to the outside of the sonic logging pipe (13); The laser ranging device is arranged on the pipe end sleeve (12) and is used to measure the distance between the two pipe ends and the exposed length of the acoustic logging pipe (13); One end of the ultrasonic probe (10) is connected to the automatic wire laying device, and the other end extends into the pipe end sleeve (12) and into the sonic logging tube (13). The ultrasonic probe (10) is used to detect the integrity of the pile foundation by transmitting and receiving signals. The dual-track pedometer (1) is electrically connected to the integrated control system, the automatic wire feeding device, and the automatic wire take-up device, respectively, and is used to record the wire feeding length and detect the step length in real time. The automatic line-laying device is used to measure the effective detection length of the pile foundation.

2. The pipe end pulley detection device suitable for acoustic transmission method according to claim 1, characterized in that, The automatic wire feeding device includes a wire feeding roller (3), a wire feeding mounting frame (32), and a wire feeding roller adjuster (31). The wire feeding roller adjuster (31) is arranged inside the pipe end sleeve (12). The wire feeding mounting frame (32) is connected to the wire feeding roller adjuster (31) by a spring. The wire feeding roller (3) is arranged inside the wire feeding mounting frame (32) by a rotating shaft.

3. The pipe end pulley detection device suitable for acoustic transmission method according to claim 2, characterized in that, There are two automatic wire feeding devices, which are symmetrically arranged inside the pipe end sleeve (12).

4. The pipe end pulley detection device suitable for acoustic transmission method according to claim 1, characterized in that, The automatic take-up device includes a take-up roller (2), a take-up mounting frame (22), and a take-up roller adjuster (21). The take-up roller adjuster (21) is arranged outside the pipe end sleeve (12). The take-up mounting frame (22) is connected to the take-up roller adjuster (21) by a spring. The take-up roller (2) is arranged inside the take-up mounting frame (22) by a rotating shaft.

5. A pipe end pulley detection device suitable for acoustic transmission method according to claim 4, characterized in that, The automatic take-up device consists of two units, symmetrically arranged on the outside of the pipe end sleeve (12).

6. The pipe end pulley detection device suitable for acoustic transmission method according to claim 1, characterized in that, The laser ranging device includes a laser ranging sensor and a telescopic rod (6). The telescopic rod (6) is connected to the laser ranging sensor and is used to adjust the height of the laser sensor.

7. A pipe end pulley detection device suitable for acoustic transmission method according to claim 6, characterized in that, Two laser ranging sensors are arranged at the upper and lower ends of the pipe end sleeve (12). The upper laser ranging sensor (51) is used to measure the distance between the two pipe ends, and the lower laser ranging sensor (52) is used to measure the exposed length of the acoustic tube (13).

8. A method for detecting pipe end pulleys using the acoustic transmission method, applied to the pipe end pulley detection device for the acoustic transmission method as described in any one of claims 1 to 7, characterized in that, Includes the following steps: Install the pipe end pulley detection device inside the acoustic tube; The telescopic rods are adjusted synchronously to ensure there are no obstructions between the upper laser rangefinders; The straight-line distance between the protective sleeves at each pipe opening is measured using the upper laser rangefinder sensor. The exposed length L of the acoustic logging tube is measured using a lower laser rangefinder. Wrap the measuring line around the dual-track pedometer and clamp it in place; Start the automatic line laying device, and place the ultrasonic probe (10) through the pipe end sleeve (12) and the sonic logging tube (13) to the bottom of the pile foundation. Measure the line laying length S by the dual-track pedometer. The effective detection length X of the pile foundation is calculated based on the relationship between the exposed length L of the sonic logging tube and the length D of the ultrasonic probe. Start the automatic line take-up device, retrieve the measuring line at a constant speed, and record the pile foundation detection position and corresponding data in real time by the dual-track pedometer (1) and the host computer until the effective detection length of the pile foundation is zero as displayed in the host computer, then stop taking up the line.

9. A method for detecting a pipe end pulley using acoustic transmission method according to claim 8, characterized in that, Calculate the effective inspection length X of the pile foundation, including the following cases: When L≥D, the effective test length of the pile foundation is X=S-(LD)=S-L+D; When L < D, the effective test length of the pile foundation is X = S - (DL) = S - D + L.

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