CN102721981A - Underground pipeline distribution detection device and method based on rectangular hollow core sensor array - Google Patents

Abstract

The invention discloses an underground pipeline distribution detection device and an underground pipeline distribution detection method based on a rectangular hollow core sensor array, which are used for measuring the trend situations of underground metal pipelines, cables and the like. The device comprises a rectangular hollow core sensor array, a gating switch, an inductance measuring meter and a host computer, wherein the rectangular hollow core sensor array is formed by combining multiple groups of strip-shaped coils wound on a rectangular hollow core; the terminal of each group of strip-shaped coils is connected with the input end of the inductance measuring meter through the gating switch; and the inductance measuring meter can be used for measuring the inductance value of each group of strip-shaped coils, and introducing the inductance value into the host computer through a data wire for analyzing. According to the device and the method, the distribution and trend of an underground pipeline can be detected conveniently and accurately by directly detecting the sensor inductive change above the pipeline ground under the condition of no excavation, no covering earth, no activation, no true contact or no influence on normal use.

Description

Device and method for detecting distribution of underground pipelines based on rectangular hollow sensor array

technical field

The invention belongs to the technical field of electromagnetic sensing, and in particular relates to an underground pipeline distribution detection device and method based on a rectangular hollow sensor array.

Background technique

Underground pipelines and cables have been widely used in today's urban capital construction, and occupy an extremely important position in the country's economic development and people's production and life. The distribution detection of underground pipelines and cables is an important means to detect and protect their safe operation. The successful development of underground pipeline distribution detection technology will ensure the safe operation of underground pipelines and cables, facilitate the acceptance and maintenance of underground pipelines and cables, and at the same time avoid unnecessary damage to underground pipelines and cables, and greatly reduce the damage caused by frequent overhauls. Loss, prevent damage to underground pipelines and cables during construction, and greatly save money and time for urban construction.

In the existing research results, the detection of underground metal pipelines mostly adopts the method that the transmitter excites the pipeline and the receiver detects it. In this method, the transmitter needs to excite metal pipes or cables, which must be connected in hardware with the pipes or cables, and the transmitter is required to be as close as possible to the target pipeline. The amount of work is large and the requirements are harsh. It is even inconvenient to excavate and cover soil at fixed points. implement. In addition, it is also required that the receiver should not be too close to the transmitter to prevent the direct interference of the transmitter and cause the inconvenience of detection implementation.

Contents of the invention

The invention provides an underground pipeline distribution detection device and method based on a rectangular hollow sensor array, which can directly detect the distribution of pipelines located above the surface of the pipeline without excavating and covering soil, without excitation, without affecting normal use, and without affecting normal use. The inductance change of the sensor can conveniently and accurately detect the distribution direction of underground pipelines.

In order to achieve the above object, the present invention is achieved through the following technical solutions:

An underground pipeline distribution detection device based on a rectangular hollow sensor array, which is used to measure the direction of underground metal pipelines and cables, and is characterized in that it includes a rectangular hollow sensor array, a gate switch, an inductance measuring instrument and a host computer ;

The rectangular air-core sensor array is composed of several groups of strip-shaped coils wound on the rectangular air-core, and the terminal of each group of strip-shaped coils is connected to the input terminal of the inductance measuring instrument through a strobe switch;

The inductance measuring instrument can measure the inductance value of each group of long strip coils, and import the inductance value into the host computer through the data line for analysis.

The length-to-width ratio of the elongated coils described in each group is 2-10.

The number of winding turns of the elongated coils in each group is between 3 and 200, and the diameter of the winding is between 0.1 mm and 10 mm.

A method for measuring the distribution of underground pipelines using the detection device described in claim 1, characterized in that the method comprises the following steps:

Step 1. When there is no object around the rectangular air-core sensor array, by controlling the strobe switch, the inductance measuring instrument measures the inductance value of each group of strip coils in turn, and then sends it to the host computer through the data line;

Step 2. Fix the rectangular air-core sensor array above the detection position. It is required to place it horizontally, so as to ensure that the heights of each group of long strip coils are equal to the ground; by controlling the gate switch, the inductance measuring instrument measures each group of strip coils in turn. The inductance value of the shaped coil is sent to the host computer through the data line;

Step 3. The upper computer determines a group of strip-shaped coils with the largest inductance change value when there is no object around and above the detection position through calculation and comparison, and the direction of the underground pipeline is approximately parallel to the group of coils.

Compared with the prior art, the present invention has the following advantages:

The invention realizes convenient and rapid determination of underground metal pipes and cable distribution directions without digging and covering soil, without excitation, without contact and without affecting normal use. Compared with the existing technology, this technology is more practical, more convenient and easier to operate, and it is one of the most feasible non-destructive detection tools for underground pipelines.

Description of drawings

Fig. 1 is the structural representation of the underground pipeline distribution detection device based on the rectangular hollow sensor array of the present invention;

Fig. 2 is a schematic structural diagram of a rectangular hollow sensor array of the present invention.

Detailed ways

The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.

As shown in Fig. 1, a kind of underground pipeline distribution detecting device based on rectangular hollow sensor array is used for measuring the direction of underground metal pipelines, cables, etc. 2. Inductance measuring instrument 3 and host computer 4;

The rectangular air-core sensor array 1 is composed of four sets of strip-shaped coils 11 wound on rectangular air-cores (see Figure 2), and the terminals of each set of strip-shaped coils 11 pass through the gate switch 2 Be connected with the input end of inductance measuring instrument 3;

The inductance measuring instrument 3 can measure the inductance value of each group of strip coils 11, and import the inductance value into the host computer 4 through the data line for analysis.

The ratio of length to width of each group of strip-shaped coils 11 is 2-10.

The number of winding turns of the elongated coils 11 in each group is between 3 and 200, and the diameter of the winding is between 0.1 mm and 10 mm.

A method for measuring the distribution of underground pipelines using the above detection device, comprising the steps of:

Step 1. When there is no object around the rectangular air-core sensor array 1, by controlling the strobe switch 2, the inductance measuring instrument 3 measures the inductance value of each group of long strip coils 11 in sequence, and then sends it to the host computer through the USB data line 4;

Step 2. Fix the rectangular air-core sensor array 1 above the detection position, and place it horizontally to ensure that each group of long strip coils 11 is at the same height from the ground; by controlling the gating switch 2, the inductance measuring instrument 3 measures in turn The inductance value of each group of long strip coils 11 is sent to the host computer 4 through the USB data line;

Step 3. The upper computer 4 determines a group of strip-shaped coils 11 with the largest inductance change value when there is no object around and above the detection position through calculation and comparison, and the direction of the underground pipeline is approximately parallel to the group of coils. Because the underground pipeline is parallel to the coil at this time, the influence on the original magnetic circuit of the coil is the greatest, resulting in the largest change in the inductance of the coil.

To sum up, the present invention is an underground pipeline distribution detection device and method based on a rectangular hollow sensor array, which can directly detect the distribution of underground pipelines without excavating and covering soil, without excitation, without affecting normal use The inductance change of the sensor above the pipeline surface can conveniently and accurately detect the distribution direction of the underground pipeline.

Although the content of the present invention has been described in detail through the above preferred embodiments, it should be understood that the above description should not be considered as limiting the present invention. Various modifications and alterations to the present invention will become apparent to those skilled in the art upon reading the above disclosure. Therefore, the protection scope of the present invention should be defined by the appended claims.

Claims (4)

1. An underground pipeline distribution detection device based on a rectangular hollow sensor array, which is used to measure the direction of underground metal pipelines, cables, etc., is characterized in that it includes a rectangular hollow sensor array (1), a gating switch (2 ), inductance measuring instrument (3) and host computer (4); The rectangular air-core sensor array (1) is composed of several groups of strip-shaped coils (11) wound on the rectangular air-core, and the terminals of each group of strip-shaped coils (11) pass through the gate switch (2) connected to the input terminal of the inductance measuring instrument (3); The inductance measuring instrument (3) can measure the inductance value of each group of long strip coils (11), and import the inductance value into the host computer (4) through the data line for analysis. 2. The underground pipeline distribution detection device based on a rectangular air-core sensor array according to claim 1, characterized in that the ratio of length to width of each group of strip coils (11) is 2-10. 3. The underground pipeline distribution detection device based on a rectangular air-core sensor array according to claim 1, characterized in that the number of winding turns of each group of strip coils (11) is between 3 and 200 , and the diameter of the winding is between 0.1mm and 10mm. 4. A method utilizing the detection device according to claim 1 to measure the distribution of underground pipelines, characterized in that the method comprises the steps: Step 1. When there is no object around the rectangular air-core sensor array (1), control the strobe switch (2) to make the inductance measuring instrument (3) measure the inductance value of each group of strip coils (11) sequentially, and then pass The data line is sent to the host computer (4); Step 2. Fix the rectangular air-core sensor array (1) above the detection position, and place it horizontally to ensure that each group of long strip coils (11) is at the same height from the ground; by controlling the gating switch (2), make The inductance measuring instrument (3) sequentially measures the inductance value of each group of strip coils (11), and then sends it to the host computer (4) through the data line; Step 3. The upper computer (4) calculates and compares to determine a group of strip-shaped coils (11) with the largest inductance change value when there is no object around and above the detection position, and the direction of the underground pipeline is approximately parallel to the group of coils.

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