CN113900139B - Detection system and method for determining spatial position information of underground buried pipeline - Google Patents
Detection system and method for determining spatial position information of underground buried pipeline Download PDFInfo
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- CN113900139B CN113900139B CN202111168293.0A CN202111168293A CN113900139B CN 113900139 B CN113900139 B CN 113900139B CN 202111168293 A CN202111168293 A CN 202111168293A CN 113900139 B CN113900139 B CN 113900139B
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- G01V1/00—Seismology; Seismic or acoustic prospecting or detecting
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Abstract
The invention relates to a detection system and a detection method for determining spatial position information of an underground buried pipeline, wherein the detection system utilizes an artificial seismic source or a mechanical seismic source to excite an elastic wave signal to the buried pipeline; arranging observation holes within a range of 2-5m beside the far end of the estimated deep buried pipeline; a plurality of detectors which are equidistantly arranged are placed in the observation hole, and the detectors are respectively connected with the corresponding seismometers; the detection method adopts the hole detector to receive the elastic wave signal from the target pipeline, analyzes the first arrival time of the detector signal through the multi-channel seismometer, calculates the burying depth of the pipeline and the distance between the pipeline and the observation hole, and then determines the space position of the deeply buried pipeline, so that the detection method is suitable for the space position detection of underground metal pipelines and nonmetallic pipelines with various burying depths, and has the advantages of simple and practical detection means, accurate and reliable detection results and no damage to the target pipeline.
Description
Technical Field
The invention relates to the field of underground pipeline detection, in particular to a detection system and a detection method capable of rapidly determining space position information of an underground buried pipeline.
Background
With the development of cities, underground pipelines are increasingly densely paved, and are limited by underground spaces, and the newly paved underground pipelines are mostly constructed in a non-excavation mode when traversing roads, especially in the sections of buildings, rivers and the like, and the depth of the pipelines can reach 20-40 meters. At present, the existing pipeline detectors are all used for detecting metal pipelines based on the frequency domain electromagnetic method principle, are greatly influenced by the resistivity of stratum media, have a general ground detection depth range of about 5 meters in a region with lower stratum resistivity, and cannot detect the space position information of a deep buried pipeline in a deeper range; for nonmetallic pipelines, the surface detection depth is more limited. However, when the exact location of such pipes is not determined, there is a great impact on other underground traversing engineering construction or underground space utilization developments. Thus, accurate identification of the need for underground space locations for such pipelines is urgent.
Disclosure of Invention
Based on the defects and shortcomings existing in the prior art when a frequency domain electromagnetic method or other conventional means is adopted to detect a metal pipeline or a nonmetal pipeline; the invention aims to provide a detection system and a detection method for indirectly obtaining spatial position information of underground buried pipeline holes through position information of a detector, and the detection system and the detection method have the characteristics of simplicity, rapidness and convenience.
The technical scheme adopted by the invention for solving the technical problems is as follows: a detection system for determining spatial position information of an underground buried pipeline comprises a controllable seismic source, a detector array, observation holes and a plurality of seismometers; wherein:
the controllable seismic source is an artificial seismic source or a mechanical seismic source and is used for exciting an elastic wave signal to the deep buried pipeline;
the detector array is formed by connecting a plurality of detectors for receiving elastic wave signals in series; the detectors are arranged in series and are arranged in observation holes in an equidistant mode, and the observation holes are buried in the range of 2-5m beside the far end of the estimated deep buried pipeline in a mode of being perpendicular to the ground;
the multichannel seismographs are respectively connected with each detector arranged in the observation hole and used for recording elastic wave signals acquired by the corresponding detectors.
In the scheme, the excitation frequency of the artificial seismic source or the mechanical seismic source is 100-800Hz, and the elastic wave signal with specific frequency is formed to propagate along the buried pipeline.
In the above scheme, the arrangement space between the detectors is set to be 0.2-1.0m, and the detectors are coupled with the inner wall of the observation hole in a mode of filling slurry into the hole.
In the scheme, the inner diameter of the observation hole is set to be 75-100mm, and the depth of the observation hole is set to be 2-3 times of the estimated buried depth of the deep buried pipeline.
The invention also provides a method for detecting the spatial position information of the underground buried pipeline based on the detection system, which comprises the following steps:
s1, determining a proper excitation point, and exciting an elastic wave signal to a buried pipeline by using an artificial seismic source or a mechanical seismic source;
s2, arranging observation holes within a range of 2-5m beside the far end of the estimated deep buried pipeline;
s3, placing a plurality of detectors which are equidistantly arranged in the observation hole, and respectively connecting the plurality of detectors with the corresponding seismometers;
s4, coupling a plurality of detectors with the inner wall of the observation hole by adopting a mode of filling slurry into the hole;
s5, analyzing the first arrival time of the elastic wave signals received by each detector through elastic wave signals recorded by a plurality of seismometers; wherein: and the minimum first arrival time t min The corresponding position information of the detector B is: the height information h of the deeply buried pipeline near the detector;
s6, determining that the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min Is provided with two detector position information; or determining that the first arrival time of the elastic wave signal received by the side of the detector B is 1.414t min Detector position information of (a);
wherein: the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min The distance between the two detectors is: the horizontal distance L from the deep buried pipeline to the observation hole;
or: the first arrival time of the detector B and the received elastic wave signal is 1.414t min The distance between detectors is: the horizontal distance L from the deep buried pipeline to the observation hole.
Further, in step S1, the excitation point is disposed in an inspection well near the buried pipeline; or if no inspection well exists around the deep buried pipeline, the outer wall of the pipeline is exposed by digging the deep pit for direct excitation.
Further, in steps S2 and S3, the embedded position of the observation hole needs to be repeatedly adjusted and determined according to the estimated position of the deep buried pipeline, and when the detector arranged in the observation hole does not detect the effective elastic wave signal or no signal, offset adjustment is performed to the estimated direction of the deep buried pipeline, and each offset is 2-3m until the offset is adjusted to the range of 2-5m beside the deep buried pipeline.
Further, in step S3, the number of detectors is 24, 24 channels are arranged on the corresponding seismometers, and the frequency range of the detectors is 10-2000Hz.
Compared with the prior art, the invention has the following advantages and effects:
1. according to the detection system and the method for determining the spatial position information of the underground buried pipeline, the spatial position information of the underground pipeline buried in different depth ranges is indirectly converted into the position information of the detector for receiving the elastic wave signal according to the Huygens principle, and the position information of the detector is related to the first arrival time of the elastic wave signal received by the detector; wherein the first arrival time minimum value (t) with the elastic wave (direct wave) min ) The corresponding detector B (i.e.: the detector closest to the deep buried pipeline distance) is the pipeline depth h (or the buried depth of the pipeline); on the basis of determining the buried depth of the pipeline, in order to further define the buried space orientation of the pipeline (namely, the position information of the pipeline relative to the observation hole), the invention converts the distance between the pipeline and the observation hole into a first arrival time minimum value t based on a certain mathematical calculation principle min The first arrival time at both sides of the point is 1.118t respectively min The distance between the two detectors; or to the first arrival time minimum t min The time from the point to the first arrival is 1.414t min And the specific spatial orientation of the deeply buried pipeline near the observation hole is accurately obtained according to the distance between the detectors.
2. The detection system and the method for determining the spatial position information of the underground buried pipeline are suitable for detecting the spatial positions of underground metal pipelines and nonmetallic pipelines with various buried depths, the detection method is simple and practical, the detection result is accurate and reliable, the target pipeline is not damaged, and the defect that the conventional detection means are greatly influenced by the resistivity of stratum media or have small detection depth can be effectively overcome.
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In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained according to these drawings without inventive faculty for a person skilled in the art.
FIG. 1 is a schematic diagram of a controllable source excited acoustic wave signal propagating along a buried pipeline according to an embodiment of the present invention.
Fig. 2 is a schematic diagram illustrating a positional relationship arrangement between an observation hole and a buried pipeline according to an embodiment of the present invention.
FIG. 3 is a schematic diagram of a system for determining spatial location information of an underground buried pipeline according to an embodiment of the present invention
FIG. 4 is a schematic diagram of a position calculation for determining spatial position information of a buried pipeline in accordance with an embodiment of the present invention.
Fig. 5 shows an embodiment of DN600 deep buried metal pipeline detection provided by an embodiment of the present invention.
Fig. 6 is a diagram of an embodiment of DN400 deep-buried PE pipe detection provided by an embodiment of the present invention.
Description of the reference numerals: 1. deeply burying a pipeline; 2. a wave detector; 3. an observation hole; 4. a seismograph; 5. excitation points.
Detailed Description
The present invention will be described in further detail with reference to the following examples, which are illustrative of the present invention and are not intended to limit the present invention thereto.
Example 1: as shown in fig. 1 to 3, a detection system for determining spatial position information of a buried pipeline comprises a controllable source, a detector array, an observation hole 3 and a plurality of seismometers 4; wherein:
the controllable vibration source is an artificial vibration source or a mechanical vibration source and is used for exciting an elastic wave signal to the deep buried pipeline 1;
the detector array is formed by connecting a plurality of detectors 2 for receiving elastic wave signals in series, the plurality of detectors arranged in series are arranged in an observation hole 3 in an equidistant mode, and the observation hole 3 is buried in the range of 2-5m beside the far end of the estimated deep buried pipeline in a mode of being perpendicular to the ground;
the multi-channel seismograph 4 is respectively connected with each detector 2 arranged in the observation hole 3 and is used for recording elastic wave signals acquired by the corresponding detectors.
In the detection system for determining the spatial position information of the underground buried pipeline according to the embodiment 1, the excitation frequency of the artificial seismic source or the mechanical seismic source is 100-800Hz, and the elastic wave signal with a specific frequency is formed to propagate along the buried pipeline 1; the arrangement space between the detectors 2 is 0.2-1.0m, and the detectors are coupled with the inner wall of the observation hole 3 in a mode of filling slurry into the hole; the inner diameter of the observation hole 3 is limited to 75-100mm, and the depth of the observation hole 3 is set to be 2-3 times of the estimated burying depth of the deeply buried pipeline 1.
Example 2: as shown in fig. 1 to 4, a method for detecting spatial position information of a buried pipeline based on the detection system described in embodiment 1 specifically includes the following steps:
as shown in fig. 1: s1, determining a proper excitation point 5, and exciting an elastic wave signal to the deep buried pipeline 1 by using an artificial seismic source or a mechanical seismic source; wherein: the excitation point 5 is arranged in an inspection well near the deeply buried pipeline 1; if no inspection well exists around the deeply buried pipeline 1, the outer wall of the pipeline is exposed by digging a deep pit for direct excitation;
as shown in fig. 2: s2, arranging observation holes 3 within a range of 2-5m of the far end side of the estimated deep buried pipeline 1;
as shown in fig. 3: s3, a plurality of detectors 2 are placed in the observation holes 3 at equal intervals, and the detectors 2 are respectively connected with the corresponding seismometers 4;
s4, coupling a plurality of detectors 2 with the inner wall of the observation hole by adopting a mode of filling slurry into the hole;
as shown in fig. 4: s5, analyzing the first arrival time of the elastic wave signals received by each detector through the elastic wave signals recorded by the seismometers 4; wherein: and the minimum first arrival time t min The corresponding position information of the detector B is: the height information h of the deeply buried pipeline 1 near the detector;
s6, determining that the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min Is provided with two detector position information; or determining that the first arrival time of the elastic wave signal received by the side of the detector B is 1.414t min Detector position information of (a);
wherein: the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min The distance between the two detectors is: the horizontal distance L from the deeply buried pipeline 1 to the observation hole 3;
or the first arrival time of the detector B and the received elastic wave signal is 1.414t min The distance between detectors is: the horizontal distance L from the deeply buried pipe 1 to the observation hole 3.
In this embodiment 2, the spatial position information of the deep buried pipe 1 includes the depth of the deep buried pipe 1 and the horizontal distance L between the pipe and the observation hole 3.
The specific principle of the method for detecting the spatial position information of the underground buried pipeline in the embodiment 2 of the invention is as follows:
the longitudinal wave speed of the metal pipeline is generally greater than 5000m/s, the longitudinal wave speed of the Polyethylene (PE) pipeline is between 2000 and 2400m/s, the longitudinal wave speed of the stratum around the pipeline is generally between 400 and 1000m/s, and the longitudinal wave speed difference is obvious. Because the propagation speed of the longitudinal wave along the pipeline is greater than that of surrounding stratum, according to the Huygens principle, on an observation section of the pipeline perpendicular to the position far away from the seismic source, the pipeline is equivalent to a sub-wave source of a secondary spherical wave, so that a direct wave signal of the sub-wave source on the observation section can be effectively separated from a refraction wave, a reflection wave and a diffraction wave signal generated by a far-end seismic source, and the direct wave can be identified more easily.
As shown in fig. 4, under the condition that the velocity v of the elastic wave of the stratum around the pipe is uniform, the first arrival time minimum (t min ) The position corresponding to the detector B is the pipeline depth h;the center of the pipeline is positioned at the point O and t Z1 The corresponding detector position is A point and t min The corresponding detector position is B point and t point Z2 The corresponding detector position is C point, t Z3 The corresponding detector position is point D, the distance ob=l, t of the pipeline from the observation hole Z1 Corresponding detector position to t Z2 The position distance of the corresponding detector is L 1 ，t min Corresponding detector position to t Z3 The position distance of the corresponding detector is L 2 . In order for l=l 1 Or l=l 2 ，t z1 、t z2 、t z3 The calculation formula is as follows:
OB＝L＝v*t min 1 (1)
OA＝v* t Z1 2, 2
OC＝v*t Z2 3
OD＝v*t Z3 4. The method is to
In order to L 1 Let OAC be isosceles triangle, oa=oc, ob+.ac, obtainable according to equations 1, 2, 3:
t z1 ＝t z2 ＝1.118t min ；
in order to L 2 Let OBD be an isosceles right triangle, ob=bd, ob+.bd, according to equations 1, 4:
t z3 ＝1.414t min ；
to sum up, as shown in FIG. 4, the first arrival times of the elastic wave signals received by the two sides of the detector B are 1.118t respectively min The detectors of (a) are respectively a detector A and a detector C, and the distance between the detectors A, C is equal to the linear distance L between the deep buried pipeline 1 and the observation hole 3; by determining the position of the detector A, C, the horizontal distance of the buried pipeline 1 from the observation hole 3 can be obtained.
In addition, the first arrival time of the elastic wave signal received by the detector B side is 1.414t min The distance between the detector B and the detector D is equal to the linear distance L between the deep buried pipeline 1 and the observation hole 3, and the horizontal distance between the deep buried pipeline 1 and the observation hole 3 can be obtained by determining the position of the detector B, D.
Further, in steps S2 and S3 of embodiment 2 of the present invention: the embedded position of the observation hole 3 needs to be repeatedly debugged and determined according to the estimated position of the deeply embedded pipeline; when the effective elastic wave signal or no signal is not detected by the detector arranged in the observation hole 3, the offset debugging is carried out towards the direction of the estimated buried pipeline, and each time the offset is 2-3m until the offset is debugged to the range of 2-5m beside the buried pipeline, wherein the range is the optimal detection range.
Further, in step S3, preferably, the number of detectors is 24, the corresponding seismometers 4 are provided with 24 channels, the frequency range of the detectors 2 is 10-2000Hz, and the interval between the detectors 2 can be set according to the detection precision requirement.
The invention also provides an engineering application example for detecting the space position of the underground buried pipeline by adopting the method, which comprises the following steps:
as shown in fig. 5, DN600 deep buried metal pipe detection embodiments; the distance between the observation hole 3 and the excitation point is 78m, and the distance between detectors is 0.5m; determining t by recording and analyzing first arrival time of elastic wave signals received by detectors through 24 seismometers min 、1.118t min 、1.414t min The method comprises the steps of carrying out a first treatment on the surface of the Actual measurement t min =7.5 ms, corresponding to a pipe center depth of 9.0m, a pipe distance from the observation hole of 3.5m.
As shown in fig. 6, DN400 deep PE pipeline detection embodiment; the distance between observation holes and excitation points is 36m,10 times of superposition excitation are carried out, the distance between detectors is 1.0m, and the first arrival time of elastic wave signals received by the detectors is recorded and analyzed through 24 seismometers to determine t min 、1.118t min 、1.414t min The method comprises the steps of carrying out a first treatment on the surface of the Actual measurement t min =9.2 ms, corresponding to a pipe center depth of 10.7m, a pipe distance from the observation hole of 2.5m.
In summary, the detection system and the detection method according to embodiments 1 and 2 of the present invention are applicable to detection of underground space positions of metal pipelines and non-metal pipelines with various buried depths, and the detection method has the characteristics of simplicity, high efficiency, accurate and reliable detection results, and no damage to target pipelines, and can effectively overcome the defect that the existing method cannot detect the space position information of the deep buried pipeline within a deeper range, and has important engineering guidance significance for development and utilization of underground space.
In addition, the specific embodiments described in the present specification may differ in terms of parts, shapes of components, names, and the like. All equivalent or simple changes of the structure, characteristics and principle according to the inventive concept are included in the protection scope of the present invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions in a similar manner without departing from the scope of the invention as defined in the accompanying claims.
Claims (7)
1. A detection method for determining spatial position information of an underground buried pipeline, characterized in that the detection system for determining the spatial position information of the underground buried pipeline is based on application, and comprises a controllable source, a detector array, observation holes and a plurality of seismometers; wherein:
the controllable seismic source is an artificial seismic source or a mechanical seismic source and is used for exciting an elastic wave signal to the deep buried pipeline;
the detector array is formed by connecting a plurality of detectors for receiving elastic wave signals in series; the detectors are arranged in series and are arranged in observation holes in an equidistant mode, and the observation holes are buried in the range of 2-5m beside the far end of the estimated deep buried pipeline in a mode of being perpendicular to the ground;
the multi-channel seismograph is respectively connected with each detector arranged in the observation hole and is used for recording elastic wave signals acquired by the corresponding detectors;
the detection method for determining the spatial position information of the underground buried pipeline comprises the following steps of
S1, determining a proper excitation point, and exciting an elastic wave signal to a buried pipeline by using an artificial seismic source or a mechanical seismic source;
s2, arranging observation holes within a range of 2-5m beside the far end of the estimated deep buried pipeline;
s3, placing a plurality of detectors which are equidistantly arranged in the observation hole, and respectively connecting the plurality of detectors with the corresponding seismometers;
s4, coupling a plurality of detectors with the inner wall of the observation hole by adopting a mode of filling slurry into the hole;
s5, analyzing the first arrival time of the elastic wave signals received by each detector through elastic wave signals recorded by a plurality of seismometers; wherein: and the minimum first arrival time t min The corresponding position information of the detector B is: the height information h of the deeply buried pipeline near the detector;
s6, determining that the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min Is provided with two detector position information; or determining that the first arrival time of the elastic wave signal received by the side of the detector B is 1.414t min Detector position information of (a);
wherein: the first arrival time of the elastic wave signals received by the two sides of the detector B is 1.118t respectively min The distance between the two detectors is: the horizontal distance L from the deep buried pipeline to the observation hole;
or: the first arrival time of the detector B and the received elastic wave signal is 1.414t min The distance between detectors is: the horizontal distance L from the deep buried pipeline to the observation hole.
2. The method according to claim 1, wherein the excitation frequency of the artificial or mechanical seismic source is 100-800Hz, and the acoustic wave signal with a specific frequency is propagated along the buried pipeline.
3. The method for determining spatial position information of a buried pipeline according to claim 1, wherein a layout interval between a plurality of detectors is set to be 0.2-1.0m, and the detectors are coupled with an inner wall of an observation hole by means of grouting slurry in the hole.
4. The method for determining spatial position information of a buried pipeline according to claim 1, wherein an inner diameter of the observation hole is set to 75-100mm, and a depth of the observation hole is set to 2-3 times an estimated buried pipeline depth.
5. The method according to claim 1, wherein in step S1, the excitation point is located in an inspection well near the buried pipeline; or if no inspection well exists around the deep buried pipeline, the outer wall of the pipeline is exposed by digging the deep pit for direct excitation.
6. The method for determining spatial position information of an underground buried pipeline according to claim 1, wherein in the steps S2 and S3, the buried position of the observation hole is determined by repeating debugging according to the estimated position of the buried pipeline, and when the detector arranged in the observation hole does not detect the effective elastic wave signal or no signal, the detector is shifted in the direction of the estimated buried pipeline by 2-3m each time until the detector is debugged to the side of the buried pipeline by 2-5 m.
7. A method for determining spatial location information of a buried pipeline according to claim 1, wherein in step S3, the number of detectors is 24, the corresponding seismometers are provided with 24 channels, and the frequency of the detectors is in the range of 10-2000Hz.
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| CN106320401A (en) * | 2016-10-27 | 2017-01-11 | 中国电建集团贵阳勘测设计研究院有限公司 | Seismic refraction method for detecting existing building pile foundation |
| CN110196452A (en) * | 2019-06-25 | 2019-09-03 | 北京城建勘测设计研究院有限责任公司 | Extraordinary great burying underground piping detection device |
| CN111208519A (en) * | 2020-01-17 | 2020-05-29 | 西安探管者探测技术有限公司 | Underground pipeline depth measuring device and method |
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