CN112946759A - Novel large buried depth buried pipeline scanning detection probe - Google Patents
Novel large buried depth buried pipeline scanning detection probe Download PDFInfo
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- CN112946759A CN112946759A CN202110115124.4A CN202110115124A CN112946759A CN 112946759 A CN112946759 A CN 112946759A CN 202110115124 A CN202110115124 A CN 202110115124A CN 112946759 A CN112946759 A CN 112946759A
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- 238000001514 detection method Methods 0.000 title claims abstract description 37
- 239000000523 sample Substances 0.000 title claims abstract description 34
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- 238000013461 design Methods 0.000 abstract description 6
- 230000008901 benefit Effects 0.000 abstract description 4
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/08—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with magnetic or electric fields produced or modified by objects or geological structures or by detecting devices
Abstract
The invention is suitable for the technical field of nondestructive testing, and provides a novel large buried depth buried pipeline scanning detection probe which comprises a main body frame which is vertically placed during detection, wherein three groups of sensors are arranged on the left, the middle and the right of the main body frame, and each group of sensors comprises one or more orthogonal double-shaft sensors which are arranged in the height direction. The array sensor has the advantages that the original detection width limit is broken through, the height limit of the probe is broken through, and the detection sensitivity is improved; meanwhile, due to the design of the array sensor, a detector is not required to swing the probe left and right, the detection sensitivity of the buried pipeline is improved, and the pipeline with larger buried depth can be detected; meanwhile, the operation mode is improved, the probe does not need to swing left and right, the labor intensity of a detector is reduced, and the detection efficiency is improved.
Description
Technical Field
The invention belongs to the technical field of nondestructive testing, and particularly relates to a novel large buried depth buried pipeline scanning detection probe.
Background
The buried pipeline is used for conveying materials such as petroleum, natural gas and water, provides energy for industrial production and daily life, and is of great importance in safety. Generally, since the transported material itself needs to be applied with a certain pressure to flow along the pipeline, the buried pipeline is generally made of pressure-resistant steel. The long-distance pipeline, the gathering pipeline and the like are common. These pipelines are expensive to manufacture and have a design life of over 20 years. For long-distance pipelines, the position of the pipeline is changed frequently due to the change of geological conditions, such as the impact of debris flow, cavitation formed by the washing of underground water, the impact of river water and the like. On the other hand, the buried depth of the original buried pipeline is changed due to the sedimentation effect, the surface accumulation and the like. In addition, the early pipeline is lack of detailed GIS signals during construction, and difficulty is caused for later maintenance. Therefore, the trend and the burial depth of the pipeline are basic data of the pipeline, and the pipeline needs to be mastered, maintained and updated as accurately as possible.
At present, the general practice is to scan the pipeline by using a probe device which adopts the classical electromagnetic principle. Firstly, exciting a periodically-changing alternating current on a detection pile of a buried pipeline by utilizing an excitation power supply. When a buried pipeline is considered as a straight long conductor, an alternating circumferential magnetic field appears around the conductor. This alternating circumferential magnetic field can be transmitted through the soil to the ground because the ground and rock do not shield the magnetic field. By adopting special pipe detecting equipment, the distribution condition of the magnetic field on the ground can be detected, and the information of the buried pipeline, namely the trend and the buried depth of the pipeline can be accurately obtained.
In actual detection, a periodically varying excitation current can be injected into the buried pipeline. This periodically varying excitation current generates a circumferential magnetic field of the same frequency around the pipe during transmission along the pipe. And the strength of the circumferential magnetic field varies with the distance from the detection position to the center of the pipe. This is the classical oersted current magnetic effect. In the case of a long straight wire, the relationship between the magnetic induction and the current can be described as:
B＝μ0I/(2πr)＝2*10-7I/r
i is the current through the pipe and r is the distance from the center of the long straight wire. This magnetic induction, which is typically on the order of nano-tesla (nT), can be calculated by the simple formula described above and by the general conditions. Since the relative permeability of air is 1, its magnetic field strength (H) and its magnetic induction (B) are equal in value. However, the alternating magnetic field generated by this signal conduit is very weak with respect to the earth's magnetic field. This requires that the sensitivity of the probe device is very high; under the condition of large burial depth (the depth is more than 5 meters), the signal is weaker, and the requirement on the sensitivity of the probe equipment is more strict.
Probes for detecting alternating circumferential magnetic fields are currently generally equipped with three single-axis sensors. When the pipeline is detected, the magnetic field strength sensed by the three sensors corresponding to each ground detection position is recorded. By the three magnetic fields at known positions, the buried depth of the buried pipeline relative to the detection position can be calculated. Therefore, in the detection, the pipe detecting equipment needs to be swung left and right in the direction perpendicular to the direction of the pipeline continuously along the approximate direction of the buried pipeline to search the maximum value or the minimum value of the alternating circumferential magnetic field generated by the pipeline so as to determine the position of the ground right above the buried pipeline.
Under the condition that the buried depth of the pipeline is less than 5 meters, the operation mode of the left-right swinging probe can conveniently determine the extreme value position of the alternating circumferential magnetic field, including the minimum point of the vertical component of the magnetic field or the maximum point of the horizontal component of the magnetic field, and the corresponding ground position, namely the position of the buried pipeline. However, this mode of operation has two significant limitations: firstly, because of the length factor of the arm, the amplitude of the manual left-right swing detection instrument of the detector is limited, and is generally between 1 meter and 2 meters; secondly, the height of the detecting instrument is limited, which is mainly determined by the height of the inspector. Because the detector needs to swing left and right, the design height of the detector needs to be less than half of the height of a human body, and therefore the detector can be operated by an inspector to swing left and right on the ground.
The limit of the left-right swing amplitude of the detector and the limit of the height of the detector determine the sensitivity of the detector. As shown in fig. 1, in the case that the buried depth of the pipeline is relatively small, the detector reads enough signals on the left and right sides of the pipeline in the process of swinging left and right, and can distinguish the trend of the change in the size of the pipeline, clearly find out the extreme point corresponding to the position of the buried pipeline. However, when the depth of the pipe is increased, the strength of the alternating magnetic field is reduced, and the circumferential angle corresponding to the amplitude of the lateral swing is reduced. Both aspects are not beneficial to finding the extreme value of the detector in the swinging process, thereby influencing the detection of the position of the pipeline and simultaneously influencing the detection of the buried depth of the pipeline.
Therefore, for the buried pipeline with the buried depth of less than 5 meters, the existing corresponding pipe detecting equipment and the operation mode can better solve the problem and obtain the buried depth and the trend of the buried pipeline. However, in the case of a buried depth of more than 5 meters, the course and buried depth of the pipe are no longer easily detected. For pipelines crossing rivers, such as pipelines crossing large rivers like yellow river and Yangtze river, the burial depth of the pipelines may exceed 30 meters, and the current technology cannot solve the problem of route detection.
Disclosure of Invention
In view of the above problems, the present invention aims to provide a novel large buried pipeline scanning and detecting probe, and aims to solve the technical problem that the existing buried pipeline detecting instrument is not suitable for large buried pipeline scanning and detecting.
The invention adopts the following technical scheme:
novel big buried depth buried pipeline scanning test probe is vertical when detecting main body frame who places, main body frame is last left side well right side and is provided with three group's sensors, and wherein every group sensor includes the one or more quadrature biax sensor of installing at direction of height.
Further, the length of the main body frame in the width direction and/or the height direction is adjustable, so that the width direction spacing and/or the height direction spacing of the orthogonal biaxial sensor is adjustable.
Further, the main body frame is provided with a plurality of sensor mounting positions in the width direction and/or the height direction, so that the mounting distance of the orthogonal double-axis sensor in the width direction and/or the height direction is adjustable.
Furthermore, the orthogonal double-shaft sensor comprises a shell, two vertical single-shaft sensors are arranged in the shell, and the installation directions of all the orthogonal double-shaft sensors are the same.
The invention has the beneficial effects that: the invention adopts three groups of sensors, namely the left group, the middle group and the right group, which is a novel probe structure scheme of the array sensor, and the effect of adopting the array sensor is that the original detection width limit is broken through, and the height limit of the probe is broken through, so that the detection sensitivity is improved; meanwhile, due to the design of the array sensor, the detection becomes a fixed detection mode, a detector is not required to swing the probe left and right, the detection sensitivity of the buried pipeline is improved, and the pipeline with larger buried depth can be detected; meanwhile, because the operation mode is improved, the probe does not need to be swung left and right, the labor intensity of a detector is reduced, and the detection efficiency is improved; in addition, in practical application, the design scheme of the array sensor of the probe can be applied to various high-efficiency detection methods, such as a back type, a trolley wheel type or an unmanned aerial vehicle type detection operation method.
Drawings
FIG. 1 is a schematic view of electromagnetic inspection of a buried pipeline;
FIG. 2 is a block diagram of the frame layout of a 3X 3 array sensor;
FIG. 3 is a block diagram of the frame layout of a 3+1 compact array sensor;
FIG. 4 is a block diagram of an orthogonal dual-axis sensor;
FIG. 5 is a position block diagram of two perpendicular single axis sensors.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Fig. 2 shows the structure of a novel large buried depth buried pipeline scanning detection probe provided by an embodiment of the present invention, and for convenience of explanation, only the parts related to the embodiment of the present invention are shown.
As shown in figure 2, the novel large buried depth buried pipeline scanning detection probe comprises a main body frame 1 which is vertically placed during detection, three groups of sensors are arranged on the main body frame 1 from left to right, and each group of sensors comprises one or more orthogonal double-shaft sensors 2 which are installed in the height direction.
The invention relates to a probe scheme of an array sensor, in figure 2, three groups of sensors in the left, middle and right are distributed on a rectangular main body frame, three orthogonal double-shaft sensors are arranged in the height direction of each group of sensors, and nine orthogonal double-shaft sensors are symmetrically arranged at the left, middle, right, upper, middle and lower positions of the main body frame. The orthogonal biaxial sensors at these positions can detect the magnetic field in the vertical direction alone, the magnetic field in the horizontal direction alone, or the magnetic fields in the vertical and horizontal directions simultaneously, depending on the specific detection requirements.
The advantage of adopting three groups of sensors on the left, the middle and the right is to avoid the need of swinging the detector left and right to find the extreme point in the detection process. Because three sets of sensors on the left, the middle and the right work simultaneously, so do not need to carry out data acquisition in the subaerial different positions above the pipeline, three sets of sensors themselves just are in different positions, can gather the buried pipeline magnetic field of different positions at the same moment, therefore obtain the position and the degree of depth information of pipeline.
In the required occasion, the 3 x 3 frame structure shown in fig. 2 can be simplified and changed into a simple and convenient frame of 3+1, as shown in fig. 3, the main frame 1 is triangular, on the main frame, the left, middle and right orthogonal double-axis sensors close to the ground can calculate the position of the buried pipeline, and the depth of the buried pipeline can be obtained by combining the fourth orthogonal double-axis sensor above the middle.
The two main body frame structures do not have the condition of swinging the frame left and right during detection, so the signal stability is better than that of a handheld detector. Higher sensitivity can be obtained with less interference from the mode of operation, and thus further benefits the detection of buried pipelines. On the basis of the array type sensor probe, information of an AD data acquisition system and a satellite positioning system is integrated, and each position obtains a group of magnetic field data, so that the pipeline magnetic field data can be acquired and recorded. Particularly, the method is used for accurately detecting the position and the depth of the buried pipeline under the conditions of large buried depth and river-crossing swamp.
As shown in fig. 4 and 5, the orthogonal biaxial sensor 2 includes a housing 21 in which two perpendicular uniaxial sensors 22 are disposed, and all the orthogonal biaxial sensors are mounted in the same direction. The both ends of unipolar sensor are the hexagonal prism, are convenient for install and are fixed in the casing.
In this embodiment, the sensor is mounted on the main body frame, and the main body frame is made of a light non-conductive and non-magnetic material, such as plastic or wood. The structural design of the device improves the operation mode of the existing detector, and the probe does not need to swing left and right, so that the limitation of the probe on the amplitude and the height does not exist.
Although illustrated, the orthogonal dual-axis sensor is fixedly mounted on the main frame to form a fixed array structure. The width and height direction distance of the orthogonal double-shaft sensor can be adjusted. Two specific implementation modes are provided: firstly, the length of the main body frame in the width direction and/or the height direction is adjustable, so that the width direction interval and/or the height direction interval of the orthogonal double-axis sensor are adjustable; secondly, the main body frame is provided with a plurality of sensor mounting positions in the width direction and/or the height direction, so that the mounting distance of the orthogonal double-axis sensor in the width direction and/or the height direction is adjustable.
For the first mode, the left-right width and up-down height extension may be performed using a folding structure or a telescopic structure. Specifically, a plurality of fixed extension gears can be set, for example, one gear every 20cm, and the gear is marked, so that the detector can conveniently input gear information into the system for later calculation. And the mode of field assembly can be adopted, so that the transportation and the storage are convenient.
For the second mode, the main body frame does not need to be adjusted in width and height, and only a plurality of sensor installation positions are needed to be arranged on the main body frame, so that a detector can select the width and height of the sensor on the main body frame by self, and the distance between the sensors can be adjusted.
Because the array sensor is adopted and a large frame structure is adopted to install the array sensor, the weight of the detection probe of the array sensor is heavier than that of the original handheld equipment. The mode of operation may be changed and the weight of the probe may be reduced by using a lightweight plastic. Certainly, the large frame structure array probe does not need to swing left and right, can adopt a back type, and can also be designed into a small trolley type, and the large frame structure array probe is determined according to the field detection environment.
The embodiment of the present invention shown in fig. 2 is illustrated as an array of 9 orthogonal dual-axis sensors, but is not limited to 9 sensors. In practice, the increase or decrease may be made as needed, such as the simple 3+1 scheme shown in fig. 3.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (4)
1. The utility model provides a novel big buried depth buried pipeline scanning test probe, its characterized in that, scanning test probe is vertical when detecting the main body frame who places, main body frame is last left side middle right is provided with three group's sensors, and wherein every group sensor includes the one or more quadrature biax sensor of installing at direction of height.
2. The novel large buried depth buried pipeline scanning detection probe of claim 1, wherein the length of the main body frame in the width direction and/or the height direction is adjustable, so that the width direction spacing and/or the height direction spacing of the orthogonal biaxial sensors are adjustable.
3. The novel large buried depth buried pipeline scanning detection probe according to claim 1, wherein the main body frame is provided with a plurality of sensor mounting positions in the width direction and/or the height direction, so that the mounting distance of the orthogonal double-shaft sensor in the width direction and/or the height direction is adjustable.
4. The novel large buried depth buried pipeline scanning and detecting probe head as claimed in any one of claims 1-3, wherein the orthogonal double-shaft sensor comprises a shell, two vertical single-shaft sensors are arranged in the shell, and the installation directions of all the orthogonal double-shaft sensors are the same.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110115124.4A CN112946759A (en) | 2021-01-28 | 2021-01-28 | Novel large buried depth buried pipeline scanning detection probe |
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| CN202110115124.4A CN112946759A (en) | 2021-01-28 | 2021-01-28 | Novel large buried depth buried pipeline scanning detection probe |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20060232259A1 (en) * | 2005-04-15 | 2006-10-19 | Olsson Mark S | Locator with apparent depth indication |
| US7443154B1 (en) * | 2003-10-04 | 2008-10-28 | Seektech, Inc. | Multi-sensor mapping omnidirectional sonde and line locator |
| US7688072B1 (en) * | 2007-09-18 | 2010-03-30 | The United States Of America As Represented By The Secretary Of The Navy | Portable magnetic sensing system for real-time, point-by-point detection, localization and classification of magnetic objects |
| US20150042323A1 (en) * | 2012-03-02 | 2015-02-12 | Speir Hunter Ltd | Fault detection for pipelines |
| US20170108469A1 (en) * | 2015-06-29 | 2017-04-20 | The Charles Stark Draper Laboratory, Inc. | System and method for characterizing ferromagnetic material |
-
2021
- 2021-01-28 CN CN202110115124.4A patent/CN112946759A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7443154B1 (en) * | 2003-10-04 | 2008-10-28 | Seektech, Inc. | Multi-sensor mapping omnidirectional sonde and line locator |
| US20060232259A1 (en) * | 2005-04-15 | 2006-10-19 | Olsson Mark S | Locator with apparent depth indication |
| US7688072B1 (en) * | 2007-09-18 | 2010-03-30 | The United States Of America As Represented By The Secretary Of The Navy | Portable magnetic sensing system for real-time, point-by-point detection, localization and classification of magnetic objects |
| US20150042323A1 (en) * | 2012-03-02 | 2015-02-12 | Speir Hunter Ltd | Fault detection for pipelines |
| US20170108469A1 (en) * | 2015-06-29 | 2017-04-20 | The Charles Stark Draper Laboratory, Inc. | System and method for characterizing ferromagnetic material |
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Application publication date: 20210611 |