Acoustic burial depth detection method for non-metal buried pipeline

Abstract

The invention discloses an acoustic burial depth detection method for a non-metal buried pipeline. The acoustic burial depth detection method comprises the following steps: 1, determining the projection of a to-be-detected buried pipeline on the ground; 2, determining a sounding point in the projection, and arranging three vibration signal receivers along a straight line in the normal direction of the projection; the first vibration signal receiver is located at a sounding point; 3, an audio frequency vibrator is adopted to continuously transmit specific frequency signals into the buried pipeline, and time differences tb and tc between the moment when the second vibration signal receiver and the third vibration signal receiver receive the sound wave signals and the moment when the first vibration signal receiver receives the sound wave signals are recorded; 4, calculating the distance d between the first vibration signal receiver, namely the sounding point and the axis of the buried pipeline; and 5, switching to the next sounding point to test the next distance d until all the distances d are obtained. According to the invention, the pipeline burial depth detection algorithm is optimized, the limitation on the placement position of the signal receiver is reduced, and the convenience and universality of the detection of the non-metal buried pipeline are improved.

Description

Technical Field

[0001] The invention relates to the technical field of underground pipeline burial depth detection, and in particular to an acoustic burial depth detection method for non-metal buried pipelines. Background Art

[0002] In the existing technology, the location and direction detection technology of non-metallic buried pipelines is relatively mature. However, the pipeline burial depth detection technology is affected by factors such as soil quality, pipe material, and environment, and the burial depth data is difficult to obtain.

[0003] Taking the ground penetrating radar method as an example, due to the characteristics of non-metallic pipe materials, radar waves can easily pass through the pipe, and the reflected wave signal is not obvious, making it difficult to determine the location of the pipe.

[0004] The acoustic vibration method can determine the location and direction of non-metallic buried pipelines by identifying the maximum position of the vibration wave on the ground. However, in terms of buried depth detection, due to the large number of algorithm parameters and the high integration of the detection equipment system, the buried depth calculation is highly complex and the detection technology is difficult to promote and use. There are still the following defects when performing buried depth detection on non-metallic buried pipelines:

[0005] 1. The current burial depth detection algorithm has many parameters and the calculation process is complicated.

[0006] 2. There are many restrictions on the placement of the signal receiver.

[0007] Therefore, how to efficiently and accurately obtain the acoustic burial depth of non-metallic buried pipelines has become a technical problem that technical personnel in this field urgently need to solve. Summary of the invention

[0008] In view of the above-mentioned defects of the prior art, the present invention provides a method for detecting the acoustic burial depth of a non-metallic buried pipeline, the purpose of which is to obtain the acoustic burial depth of the non-metallic buried pipeline more efficiently and accurately.

[0009] To achieve the above object, the present invention discloses a method for acoustically detecting the buried depth of a non-metallic buried pipeline, comprising the following steps:

[0010] Step 1: determine the projection of the buried pipeline to be detected on the ground;

[0011] Step 2, determining a sounding point on the projection of the buried pipeline, and arranging three vibration signal receivers along a straight line along the normal direction of the projection of the buried pipeline at the sounding point;

[0012] Wherein, the first vibration signal receiver is located at the depth measurement point;

[0013] The distance between the first vibration signal receiver and the second vibration signal receiver is m;

[0014] The distance between the second vibration signal receiver and the third vibration signal receiver is n;

[0015] Step 3: Use an audio vibrator to continuously transmit a specific frequency signal into the buried pipeline, and after the first vibration signal receiver receives the sound wave signal, record the time difference t between the time when the second vibration signal receiver receives the sound wave signal and the time when the first vibration signal receiver receives the sound wave signal. b ,

[0016] and the time difference t between the time when the third vibration signal receiver receives the sound wave signal and the time when the first vibration signal receiver receives the sound wave signal c ;

[0017] Step 4, calculating the distance d between the first vibration signal receiver, that is, the depth measurement point and the axis of the buried pipeline;

[0018] Step 5: Switch to the next sounding point to test the distance d between the next sounding point and the axis of the buried pipeline, until the distance d between all sounding points on the ground and the axis of the buried pipeline is obtained.

[0019] The calculation formula of the distance d between the first vibration signal receiver, that is, the depth measurement point and the axis of the buried pipeline is as follows:

[0020]

[0021] The distance d between each of the depth measuring points and the axis of the buried pipeline is measured multiple times, and large floating data are removed to finally obtain an accurate buried depth value.

[0022] Beneficial effects of the present invention:

[0023] The present invention optimizes the pipeline buried depth detection algorithm, reduces the number of parameters required for buried depth detection, solves the problem of cumbersome buried depth calculation, reduces restrictions on the placement of signal receivers, and improves the convenience and universality of non-metallic buried pipeline detection.

[0024] Compared with traditional algorithms, the present invention has fewer parameters, making the calculation process more concise and efficient. At the same time, the mobile terminal is used to automatically calculate the buried depth value in real time, without the need for complex manual operations and professional equipment, which greatly improves the detection efficiency and convenience;

[0025] The signal receiver in the present invention can be placed at any position within a large spatial range, breaking the limitations of traditional layouts and effectively reducing the possibility of being restricted by environmental factors. For example, in complex terrain, narrow spaces or areas with obstacles, signal receivers can be flexibly arranged to ensure smooth detection of non-metallic buried pipelines.

[0026] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 A schematic diagram showing the arrangement of three groups of vibration signal receivers for three sounding points in one embodiment of the present invention is shown.

[0028] Figure 2 A schematic diagram showing the principle of obtaining the burial depth of any measuring point through three vibration signal receivers in one embodiment of the present invention. DETAILED DESCRIPTION

[0029] Example

[0030] like Figure 1 As shown, the acoustic burial depth detection method for non-metallic buried pipelines includes the following steps:

[0031] Step 1, determining the projection of the buried pipeline 1 to be detected on the ground;

[0032] Step 2, determining a sounding point at the projection of the buried pipeline 1, and arranging three vibration signal receivers along a straight line along the normal direction of the projection of the buried pipeline 1 at the sounding point;

[0033] Wherein, the first vibration signal receiver 2 is located at the depth measurement point;

[0034] The distance between the first vibration signal receiver 2 and the second vibration signal receiver 3 is m;

[0035] The distance between the second vibration signal receiver 3 and the third vibration signal receiver 4 is n;

[0036] Step 3: Use an audio vibrator to continuously transmit a specific frequency signal into the buried pipeline 1, and after the first vibration signal receiver 2 receives the sound wave signal, record the time difference t between the time when the second vibration signal receiver 3 receives the sound wave signal and the time when the first vibration signal receiver 2 receives the sound wave signal. b ,

[0037] and the time difference t between the time when the third vibration signal receiver 4 receives the sound wave signal and the time when the first vibration signal receiver 2 receives the sound wave signal c ;

[0038] Step 4, calculating the distance d between the first vibration signal receiver 2, i.e. the depth measurement point and the axis of the buried pipeline 1;

[0039] Step 5: Switch to the next sounding point to test the distance d between the next sounding point and the axis of the buried pipeline 1 until the distance d between all sounding points on the ground and the axis of the buried pipeline 1 is obtained.

[0040] In some embodiments, the calculation formula of the distance d between the first vibration signal receiver 2, that is, the depth measurement point and the axis of the buried pipeline 1 is as follows:

[0041]

[0042] In some embodiments, the distance d between each depth measuring point and the axis of the buried pipeline 1 is measured multiple times, and large floating data are removed to finally obtain an accurate buried depth value.

[0043] The principle of the present invention is as follows:

[0044] As shown in 2 , A, B, and C are the locations of the first vibration signal receiver 2 , the second vibration signal receiver 3 , and the third vibration signal receiver 4 , respectively, and O is the axial position of the buried pipeline 1 .

[0045] The distance d between the sounding point and the axis of the buried pipeline 1 is OA, and the time t required for the sound wave signal to reach A from O is a The product of the propagation speed v of the sound wave signal is

[0046] The ratio of OB to OA is

[0047] The ratio of OC to OA is

[0048] make We obtain OB = d·λ1, OC = d·λ2;

[0049] but

[0050]

[0051] (m+n) 2 λ1 2 -m 2 λ2 2 =n 2 +2mn

[0052] [(m+n)λ1+mλ2]·[(m+n)λ1-mλ2]=n 2 +2mn

[0053] Will After substituting, we get:

[0054]

[0055] Let ∠AOB = θ, then

[0056]

[0057] but

[0058] The present invention innovates the algorithm, reduces the number of parameters, makes the calculation more concise and efficient, saves time, and can use the mobile terminal to automatically calculate the burial depth value in real time without the need for professional equipment and complicated operations, thus reducing labor costs, improving overall efficiency, and saving money.

[0059] The present invention improves the layout of the vibration signal receiver, and the signal receiver can be placed arbitrarily in a large space, adapting to complex environments, and having strong practicality. It has low professional requirements for operators, high ease of use, and can also be used in combination with equipment from other manufacturers, with wide universality and strong scalability.

[0060] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A method for acoustic depth detection of non-metallic buried pipelines; characterized in that: The steps include: Step 1, determining the projection of the buried pipeline (1) to be detected on the ground; Step 2, determining a sounding point on the projection of the buried pipeline (1), and arranging three vibration signal receivers along a straight line along the normal direction of the projection of the buried pipeline (1) at the sounding point; Wherein, the first vibration signal receiver (2) is located at the depth measurement point; The distance between the first vibration signal receiver (2) and the second vibration signal receiver (3) is m; The distance between the second vibration signal receiver (3) and the third vibration signal receiver (4) is n; Step 3: Use an audio vibrator to continuously transmit a specific frequency signal into the buried pipeline (1), and after the first vibration signal receiver (2) receives the sound wave signal, record the time difference t between the moment when the second vibration signal receiver (3) receives the sound wave signal and the moment when the first vibration signal receiver (2) receives the sound wave signal. b , and the time difference t between the moment when the third vibration signal receiver (4) receives the sound wave signal and the moment when the first vibration signal receiver (2) receives the sound wave signal c ; Step 4, calculating the distance d between the first vibration signal receiver (2), that is, the depth measurement point and the axis of the buried pipeline (1); Step 5: switch to the next sounding point to test the distance d between the next sounding point and the axis of the buried pipeline (1), until the distance d between all sounding points on the ground and the axis of the buried pipeline (1) is obtained.

2. The acoustic depth detection method for non-metallic buried pipelines according to claim 1; characterized in that: The calculation formula for the distance d between the first vibration signal receiver (2), i.e. the depth measurement point, and the axis of the buried pipeline (1) is as follows:

3. The acoustic depth detection method for non-metallic buried pipelines according to claim 1; characterized in that: The distance d between each of the depth measuring points and the axis of the buried pipeline (1) is measured multiple times, and large floating data are removed to finally obtain an accurate buried depth value.

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