CN213240543U - Accurate detection device of pipeline - Google Patents
Accurate detection device of pipeline Download PDFInfo
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- CN213240543U CN213240543U CN202021697236.2U CN202021697236U CN213240543U CN 213240543 U CN213240543 U CN 213240543U CN 202021697236 U CN202021697236 U CN 202021697236U CN 213240543 U CN213240543 U CN 213240543U
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Abstract
The utility model relates to an underground pipeline accurate detection device, which comprises a winch (1) and a data acquisition unit (2) arranged on the winch (1), wherein both ends of the data acquisition unit (2) are respectively connected with a first cable (21) and a second cable (22); the other end of the first cable (21) is connected with a launching probe (3) which is used for being placed in any underground borehole; the other end of the second cable (22) is connected with a receiving probe (4) for placing in other underground boreholes. The utility model discloses an accurate detection device of pipeline, the degree of depth and the position of surveying pipeline that can be quick accurate.
Description
Technical Field
The utility model relates to a pipeline detection technology field especially relates to an accurate detection device of pipeline.
Background
The underground pipeline network is an indispensable important infrastructure in city operation and development, and underground pipelines not only provide important living goods and materials for residents in cities, but also bear the responsibility of providing basic resources and energy for city development. The perfect and developed underground pipeline system and the safe and stable operation thereof are the guarantee and the foundation of the operation of the modern city. However, the laying of some underground pipelines is long, the daily management and maintenance are lacked, and the pipeline data is seriously lost. In urban construction or construction process, due to the lack of real-time pipeline diagrams of underground pipelines in a construction area and the absence of a rapid and accurate pipeline detection means, real-time underground pipeline distribution conditions cannot be obtained, so that the pipelines cannot be effectively avoided in the construction process, further the pipelines are damaged, and even a series of accidents are caused.
The detection of pipelines in the prior art is mostly on the other side of the ground of the geological radar, the detection of the depth and the position of the underground pipelines is not accurate enough, and even the pipelines with large burial depth can not be detected at all. The existing pipeline instrument for drilling detection is mostly single-hole detection, can only detect the depth of a pipeline and cannot accurately position the pipeline.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to solve above-mentioned problem, provide a quick, accurate detection device of pipeline.
In order to achieve the above purpose of the utility model, the utility model provides an underground pipeline accurate detection device, which comprises a winch and a data acquisition unit arranged on the winch, wherein the two ends of the data acquisition unit are respectively connected with a first cable and a second cable;
the other end of the first cable is connected with a launching probe which is used for being placed in any underground borehole;
the other end of the second cable is connected with a receiving probe for placing in other underground boreholes.
According to an aspect of the utility model, the transmission probe is equipped with half-wave dipole antenna, and the receiving probe is equipped with whip antenna.
According to the utility model discloses an aspect, the electromagnetic wave electric field intensity of launching probe is E0, and the receiving probe electromagnetic wave electric field intensity is E, satisfies the relational expression:
wherein β represents an absorption coefficient of the medium for the electromagnetic wave; r represents the distance between the receiving point and the transmitting point; f (θ) represents an antenna directivity factor; theta represents the angle between the antenna and the direction of the electric field at the receiving point.
According to an aspect of the present invention, the absorption coefficient β of the medium to the electromagnetic wave satisfies:
where ω represents the antenna frequency; μ represents the relative permeability of the medium; σ represents the conductivity of the medium; ε represents the relative permittivity of the medium.
According to an aspect of the present invention, the half-wave dipole antenna and the whip antenna are each set to 1 meter in length.
According to the utility model discloses an aspect, the launching point of launching exploring tube is apart from being 1 meter, and the measuring point is apart from being 0.2 meter.
The underground pipeline accurate detection device is based on the difference of different lithologic electromagnetic wave absorption coefficients in the stratum, holes are drilled in the ground surface, the transmitting probe is arranged in a first drilled hole, and electromagnetic waves are transmitted through the transmitting antenna, so that an electromagnetic field is formed underground. The electromagnetic field propagates in the stratum and is reflected, refracted, scattered and the like when meeting different geological bodies, so that the distribution of the electromagnetic field is changed. And then the receiving probe is placed in another drill hole, the residual electromagnetic wave information is collected through the receiving antenna, and after data processing, the spatial distribution form of the electromagnetic wave absorption coefficient of the detection area can be obtained, so that the parameters of the abnormal body such as physical property, production state and the like can be deduced, and the depth and the position of the underground pipeline can be determined.
Drawings
Fig. 1 is a schematic view illustrating a structure of an underground utility precision detecting apparatus according to an embodiment of the present invention;
FIG. 2 schematically shows a borehole gridding schematic;
fig. 3 schematically shows a diagram of the absorption coefficient.
Detailed Description
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the invention, and that for a person skilled in the art, other drawings can be derived from them without inventive effort.
In describing embodiments of the present invention, the terms "longitudinal," "lateral," "up," "down," "front," "back," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and other terms are used in an orientation or positional relationship shown in the associated drawings for convenience in describing the invention and for simplicity in description, and are not intended to indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
The present invention will be described in detail with reference to the accompanying drawings and specific embodiments, which are not repeated herein, but the present invention is not limited to the following embodiments.
As shown in FIG. 1, the utility model discloses an accurate detection device of underground pipeline includes winch 1, sets up data collection station 2 on winch 1, and data collection station 2 both ends are connected with first cable 21 and second cable 22 respectively. The other end of the first cable 21 is connected with a transmitting probe 3 for placing in any underground borehole, and the other end of the second cable 22 is connected with a receiving probe 4 for placing in other underground boreholes. The transmitting probe 3 is provided with a half-wave dipole antenna, and the receiving probe 4 is provided with a whip antenna.
The underground pipeline accurate detection device is characterized in that holes are drilled on the ground surface on the basis of the difference of different lithologic electromagnetic wave absorption coefficients in the stratum, the transmitting probe 3 is arranged in a first drilled hole, and an electromagnetic field is formed underground through transmitting antenna electromagnetic waves. The electromagnetic field propagates in the stratum and is reflected, refracted, scattered and the like when meeting different geological bodies, so that the distribution of the electromagnetic field is changed. Then, the receiving probe 4 can be placed in another borehole, the remaining electromagnetic wave information is collected through a receiving antenna, and after data processing, the spatial distribution form of the electromagnetic wave absorption coefficient of the detection area can be obtained, so that the parameters of the abnormal body such as physical property, production state and the like can be deduced, and the depth and the position of the underground pipeline can be determined.
Referring to fig. 1 to 3, specifically, the electromagnetic wave electric field intensity of the transmitting probe 3 is E0, and the electromagnetic wave electric field intensity of the receiving probe 4 is E, which satisfy the following conditions:
in the above formula, β represents an absorption coefficient of the medium for the electromagnetic wave; r represents the distance between the receiving point and the transmitting point; f (θ) represents an antenna directivity factor; theta denotes the angle between the antenna and the direction of the electric field at the receiving point, and e is a constant, and is usually 2.718.
And the absorption coefficient beta of the medium to the electromagnetic wave satisfies the following conditions:
where ω represents the antenna frequency; μ represents the relative permeability of the medium; σ represents the conductivity of the medium; ε represents the relative permittivity of the medium.
From the above equation, when ω and μ are constant, the absorption coefficient β of the medium for electromagnetic waves is mainly related to σ and ∈. Whereas a larger σ means a better conductivity of the medium and a faster field strength decay. In actual work, the resistivity difference exists between the surrounding rock and the geological abnormal body (no matter high absorption or low absorption), the electromagnetic wave generates reflection, refraction and scattering effects at the interface of the surrounding rock and the abnormal body, and the high absorption abnormality is judged when the field intensity of the electromagnetic wave received by the receiving antenna is reduced and the abnormality occurs.
The utility model discloses an underground pipeline accurate positioning device has the frequency sweep function, can once measure the data of a plurality of frequencies. Generally, 4MHz, 8MHz and 16MHz sweep frequency measurement is selected. The measurement method adopts the combination of synchronization and fixed point, after synchronous scanning, fixed point accurate measurement is carried out, the distance between the transmitting points is 1m, the distance between the measuring points is 0.2m, the smaller the distance between the receiving points is, the higher the detection resolution is, the mode of exchanging measurement is adopted, the non-measuring blind area is ensured, and the data information is reliable and reliable. The length of the transmitting antenna and the length of the receiving antenna are both 1 m.
Combine fig. 1 to show, the utility model discloses an underground pipeline accurate positioning turns to, through the electromagnetic wave electric field intensity data of reciprocating the whole section of collection of exploring tube, and the data storage that will record carries out data processing and inversion in ground data collection station 2, the leading-in computer afterwards.
The method comprises the following steps: firstly, preprocessing data, namely eliminating mutation points of the acquired data, comparing the change trend of the data before and after suspicious data, and smoothing by combining data of adjacent measuring points, stratum lithology and the like. The preprocessing aims at screening credible data, and the specific method comprises the steps of drawing a frequency curve by utilizing the collected data, extracting an optimal frequency curve and establishing a data file with corresponding frequency. Then finding out abnormal distribution rule from the frequency curve, and optimizing the optimal frequency curve to eliminate individual distortion point.
With reference to fig. 2, the data processing of the present invention calculates the absorption coefficient β of each grid in the profile by inversion, and reconstructs an image of the absorption coefficient β from the acquired data. At present, Algebraic Reconstruction Technology (ART), combined iterative reconstruction technology (SIRT), damped least square method (LSQR) and the like are applied to more methods. The SIRT method is based on an improvement of the ART method, both of which are solutions to a system of linear algebraic equations. In the calculation process of the ART method, the distribution of projection data and the updating of grid unit functions are carried out simultaneously, while the SIRT method firstly distributes the projection data, and then updates the image functions in the units after all grid units are distributed to the data. Compared with the ART method, the SIRT method can better weaken or even eliminate noise, enhance the smoothness degree of the data grid and the integrity of the data, and simultaneously has better iterative convergence and faster convergence speed.
In the SIRT method electromagnetic wave CT image reconstruction, a detection area is gridded (figure 2), and the medium in all grids is assumed to be uniform, and the absorption coefficients are consistent. As can be seen from fig. 2, the length of the ith ray (the path from transmission to reception) is the total distance of all grids passed by the ray, and can be expressed as:
substituting into a formula:
in the formula, k is iteration times;
the absorption coefficient of the kth iteration of the jth grid; wjTo pass throughTotal number of rays for j grids;
the field strength after the kth iteration for the ith ray. Finally, the absorption coefficient beta of each grid is iterated, and the data is gridded into a section view by using software, as shown in fig. 3, wherein a high absorption anomaly, for example, higher than 12.5, is the position of the underground pipeline.
The above description is only one embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. The underground pipeline accurate detection device is characterized by comprising a winch (1) and a data acquisition unit (2) arranged on the winch (1), wherein two ends of the data acquisition unit (2) are respectively connected with a first cable (21) and a second cable (22);
the other end of the first cable (21) is connected with a launching probe (3) which is used for being placed in any underground borehole;
the other end of the second cable (22) is connected with a receiving probe (4) which is used for being placed in other underground drill holes;
the transmitting probe tube (3) is used for transmitting electromagnetic waves, and the receiving probe tube (4) is used for receiving the electromagnetic waves.
2. The underground utility accurate detecting device according to claim 1, characterized in that the transmitting probe (3) is provided with a half-wave dipole antenna and the receiving probe (4) is provided with a whip antenna.
3. The underground pipeline accurate detection device according to claim 2, wherein the electromagnetic wave electric field intensity of the launching probe (3) is E0, the electromagnetic wave electric field intensity of the receiving probe is E, and the following relation is satisfied:
wherein β represents an absorption coefficient of the medium for the electromagnetic wave; r represents the distance between the receiving point and the transmitting point; f (θ) represents an antenna directivity factor; theta represents the angle between the antenna and the direction of the electric field at the receiving point.
4. The underground pipeline accurate detection device according to claim 3, wherein the absorption coefficient β of the medium to the electromagnetic wave satisfies:
where ω represents the antenna frequency; μ represents the relative permeability of the medium; σ represents the conductivity of the medium; ε represents the relative permittivity of the medium.
5. The underground utility accurate detection device according to any one of claims 2 to 4, wherein the length of each of the half-wave dipole antenna and the whip antenna is set to 1 meter.
6. The underground pipeline accurate detection device according to claim 5, wherein the distance between the launching points of the launching probe (3) is 1 meter, and the distance between the measuring points is 0.2 meter.
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|---|---|---|---|
| CN202021697236.2U CN213240543U (en) | 2020-08-14 | 2020-08-14 | Accurate detection device of pipeline |
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| CN202021697236.2U CN213240543U (en) | 2020-08-14 | 2020-08-14 | Accurate detection device of pipeline |
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