CN115079280A - Cable path detection method and system for high-voltage cable jacking pipe laying section - Google Patents
Cable path detection method and system for high-voltage cable jacking pipe laying section Download PDFInfo
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Abstract
The invention relates to the field of high-voltage cable path detection, in particular to a cable path detection method and a system for a high-voltage cable jacking pipe laying section, wherein the method comprises the steps of preliminarily determining the position and the embedding depth of a high-voltage cable to be detected, drilling a hole position at a preset distance from the preliminarily determined position of the high-voltage cable to be detected by using a drilling machine, putting an antenna of an electromagnetic induction gradiometer into the hole position, and measuring electric field gradient values of different depth points; and selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole position by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method. The invention can obtain the specific position and depth of the high-voltage cable at the pipe-jacking laying section, solve the problem of difficult cable path check under no probe pipe at the pipe-jacking laying section of the cable, ensure the safe operation of the cable at the pipe-jacking laying section and further ensure the stable operation of a power grid.
Description
Technical Field
The invention relates to the field of high-voltage cable path detection, in particular to a cable path detection method and system for a high-voltage cable jacking pipe laying section.
Background
The horizontal directional drilling technology lays an electric power pipeline, also called a jacking pipe laying section, and is used as a common laying mode for high-voltage cables to pass through intersections. When subsequent underground excavation and other constructions are crossed with the cable at the pipe-jacking laying section, in order to protect the safe and stable operation of the underground cable, the cable is usually excavated by adopting a manual hole digging pile or a slope placing method, and the cable cannot be excavated when the depth is too deep.
When underground excavation and other construction are crossed with the cable at the pipe jacking laying section, the specific position of the underground pipeline is difficult to obtain. According to statistics, 60% of cable external force damage events caused by construction in the south network range occur in the crossing of the pipe-jacking laying section and other construction ranges every year, so that the position detection of the cable in the pipe-jacking laying section is very important, and especially the situation of lack of a detection pipe is urgently needed to be solved.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides a method and a system for detecting a cable path of a high-voltage cable jacking pipe laying section.
The invention aims to provide a cable path detection method for a high-voltage cable jacking pipe laying section.
The second purpose of the invention is to provide a cable path detection system for the high-voltage cable jacking pipe laying section.
The first purpose of the invention can be achieved by adopting the following technical scheme:
a method of cable path detection of a high voltage cable top pipe run, the method comprising:
connecting a transmitter of a metal pipeline detector with an outer lead of a sheath of a high-voltage cable to be detected on the ground, wherein the transmitter provides a harmonic current detection signal, a receiver of the metal pipeline detector receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the embedding depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal;
according to the position and the embedding depth of the preliminarily determined high-voltage cable to be tested, drilling a hole position at a preset distance from the position of the preliminarily determined high-voltage cable to be tested by using a drilling machine, wherein the depth of the hole position is greater than the embedding depth of the preliminarily determined high-voltage cable to be tested, placing an antenna of an electromagnetic induction gradiometer into the hole position, and measuring the gradient values of electric fields at different depth points;
and selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole position by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
Preferably, the frequency range of the harmonic current detection signal provided by the transmitter of the metal line detector is 2Hz-60 Hz.
Preferably, the placing the antenna of the electromagnetic induction gradiometer into the hole site, measuring the electric field gradient values of different depth points, includes: the antenna is put into a hollow plastic pipe, and the electric field gradient values of all points are measured upwards sequentially at preset distance intervals from the bottom of the hole.
Preferably, the calculation formula of the burying depth of the high-voltage cable is as follows:
d＝E t /(E b -E t )·X
wherein E t Horizontal component of magnetic field measured for upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
The second purpose of the invention can be achieved by adopting the following technical scheme:
a cable path detection system for a high voltage cable jacking run, the system comprising:
the device comprises a primary detection module, a receiver and a control module, wherein the primary detection module is used for connecting a transmitter of a metal pipeline detector with an outer lead of a sheath of a high-voltage cable to be detected on the ground, the transmitter provides a harmonic current detection signal, the receiver of the metal pipeline detector receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the embedding depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal;
the electric field gradient value detection module is used for drilling a hole position at a preset distance from the preliminarily determined position of the high-voltage cable to be detected by using a drilling machine according to the preliminarily determined position and the embedding depth of the high-voltage cable to be detected, the depth of the hole position is greater than the preliminarily determined embedding depth of the high-voltage cable to be detected, an antenna of the electromagnetic induction gradiometer is placed in the hole position, and the electric field gradient values of different depth points are measured;
and the calculation output module is used for selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole site by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a method and a system for detecting a cable path of a high-voltage cable jacking pipe laying section, which are characterized in that under the condition that a sufficient safety distance is reserved at a primary detection cable position, a drilling machine is used for drilling a hole position, an electromagnetic induction gradiometer is placed into the drilled hole, and the specific position and depth of the high-voltage cable of the jacking pipe laying section are obtained through calculation according to the electromagnetic induction principle, so that the problem that the cable path of the cable jacking pipe laying section without a detection pipe is difficult to check is solved, the safe operation of the cable of the jacking pipe laying section is ensured, and the stable operation of a power grid is ensured.
Drawings
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 description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a flow chart of a cable path detection method in an embodiment of the invention;
FIG. 2 is a schematic diagram of the cable path detection principle in an embodiment of the invention;
fig. 3 is a schematic diagram illustrating the principle of a double coil method for determining the buried depth of an underground pipeline in the embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described in further detail with reference to the drawings and examples, and it is obvious that the described examples are some examples of the present invention, but not all examples, and the embodiments of the present invention are not limited thereto. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
The invention is to detect the position of the cable primarily by a pipeline detector, wherein the pipeline detector is used for coupling physical signals or applying physical signals on the cable, then receiving the induction value of the physical signals by the pipeline detector, and judging the position of the cable according to the strength and distribution condition of the induction value. Then, under the condition that enough safety distance is reserved at the position of the initial detection cable, drilling a hole position by using a drilling machine, and an electromagnetic induction gradiometer is placed in the borehole, the electromagnetic induction gradiometer is a measuring instrument capable of inducing the magnitude of electromagnetic signals, by adopting the electromagnetic induction principle, a transmitter matched with a pipeline detector is adopted to apply a low-frequency signal on a coaxial cable at the position of a grounding box of a high-voltage cable, the position of the grounding box of the high-voltage cable refers to the position of the grounding box of a grounding wire attached well of a middle joint of the high-voltage cable, a reflection value of the low-frequency signal is collected by using an electromagnetic induction gradiometer, and finally according to an electromagnetic mathematical relation, and reversely deducing the position of the actual cable position from the drilled hole by comparing the collected emission value signal size, thereby obtaining the specific position and depth of the high-voltage cable at the jacking pipe laying section, and limiting the error range of the specific position and depth of the high-voltage cable at the jacking pipe laying section within 30 centimeters.
As shown in fig. 1, the method for detecting the cable path of the high-voltage cable jacking-pipe laying section according to the invention comprises the following steps:
and S1, connecting the outer lead of the sheath of the high-voltage cable to be detected on the ground through a transmitter of the metal pipeline detector, wherein the transmitter provides a harmonic current detection signal, the receiver receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the embedding depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal.
The high-voltage cable for underground pipeline belongs to concealed engineering, and can not be seen and excavated completely, so that it must be probed by means of special instrument and equipment to find its position and burying depth. Preferably, the high-voltage cable is detected by a metal pipeline detector through an electromagnetic method, a transmitter of the metal pipeline detector generates a primary alternating magnetic dipole field on the ground, when the underground high-voltage cable exists, because the size and the direction of the primary field magnetic flux passing through the underground high-voltage cable are continuously changed, induced current is generated in the high-voltage cable according to the electromagnetic induction law, the size of the induced current is in direct proportion to the change of the magnetic flux, the frequency of the induced current is the same as that of a magnetic field, and the induced current generates a secondary magnetic field; the receiver of the pipeline detector is used on the ground to receive a secondary magnetic field signal generated by induced current generated in the high-voltage cable, the position of the cable is judged by detecting the strength and distribution condition of the secondary magnetic field signal, the position and the embedding depth of the high-voltage cable are preliminarily obtained, and the position of the high-voltage cable embedded underground can be preliminarily detected. The principle of cable path detection is shown in fig. 2.
The pipeline constructed by the directional drilling crossing method generally has larger buried depth, and the excited secondary magnetic field signal of the high-voltage cable is attenuated due to the increase of the buried depth, so that the intensity of the signal which can be loaded by a transmitter needs to be large enough, and a high-power special pipeline detecting instrument needs to be adopted, so that the intensity of the transmitted signal can reach multiple times of that of the common pipeline detecting instrument (the maximum detection depth of the common pipeline detecting instrument is 5-6 meters).
Preferably, the invention uses a metal pipeline detector, such as a PCMX current surveying and mapping system pipeline detector manufactured by ledy, england, which has high stability and accurate depth measurement performance, and the output power range of the transmitter of the PCMX current surveying and mapping system pipeline detector is 0W-150W, and the maximum current is 3A. However, the present invention is intended to be illustrative of a method and is not limited to this type of metal line probe. The transmitter of the metal pipeline detector can ensure that the maximum transmission distance of signals is 30 kilometers, the signal output intensity is more than 10 times higher than that of the conventional pipeline positioning equipment, and the number of required pipeline connection points is greatly reduced, so that the pipeline detection distance is increased, the signal intensity and stability of a target pipeline are enhanced, and the detection of a long-distance deeply-buried pipeline becomes possible. By adopting proper equipment and reasonable connection and grounding methods, the detection depth of the pipeline can reach 15-20 meters.
The frequency range of harmonic current detection signals provided by the transmitter is 2Hz-60Hz, and the lower frequency has the characteristic of stable signals. In order to improve the detection accuracy and accuracy, the present invention preferably uses a 4Hz frequency for specific signal loading.
S2, according to the position and the embedding depth of the preliminarily determined high-voltage cable to be measured, drilling a hole position at a preset distance from the position of the preliminarily determined high-voltage cable to be measured by using a drilling machine, wherein the depth of the hole position is greater than the embedding depth of the preliminarily determined high-voltage cable to be measured, placing an antenna of the electromagnetic induction gradiometer into the hole position, and measuring the gradient value of the electric field at different depth points.
Drilling a hole position by using a drilling machine under the condition that a sufficient safety distance is reserved at the position of the initial detection cable, an electromagnetic induction gradiometer is placed in the drill hole, the electromagnetic induction gradiometer is a measuring instrument for inducing the size of an electromagnetic signal, by adopting the electromagnetic induction principle, a transmitter matched with a pipeline detector is adopted to apply a low-frequency signal on a coaxial cable at the position of a grounding box of a high-voltage cable, the position of the grounding box of the high-voltage cable refers to the position of the grounding box of a grounding wire auxiliary well of a middle joint of the high-voltage cable, an electromagnetic induction gradiometer is used for collecting the reflection value of the low-frequency signal, and finally according to an electromagnetic mathematical relation, and reversely deducing the position of the actual cable position from the drilled hole by comparing the collected emission value signal size, thereby obtaining the specific position and depth of the high-voltage cable at the jacking pipe laying section, and limiting the error range of the specific position and depth of the high-voltage cable at the jacking pipe laying section within 30 centimeters.
Preferably, in order to achieve high-precision detection of the position of the pipeline, the detection is performed using an antenna-in-hole method (electromagnetic gradient attenuation). The specific operation is to select the position of the drill hole by using the data of the initial exploration. The depth of the drilled hole is determined according to the depth of the initial detection pipeline, generally speaking, the depth of the drilled hole is about 5 meters greater than the depth of the pipeline to be detected, the hollow plastic pipe is put into the hole after the hole is formed, then the antenna is put into the hollow plastic pipe, the electric field gradient values of all points are measured upwards in sequence at intervals of 0.10 meter from the bottom of the hole, and the strongest point of the signal is selected so as to position the central position of the pipeline.
S3, selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole position by adopting the magnetic field intensity values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
Preferably, the determination of the buried depth of the underground high-voltage cable can be obtained by adopting a double-coil method, wherein the double-coil method is to respectively measure the magnetic field strength value E of an upper horizontal coil and a lower horizontal coil by utilizing the upper horizontal coil and the lower horizontal coil which are separated by a certain distance t 、E b ，E t 、E b Is the upper and lower points of the maximum electric field gradient value measured in step 2, wherein E t For the horizontal component of the magnetic field measured by the upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils. The underground pipeline buried depth is determined by using the principle of a double-coil method, as shown in figure 3.
According to the relation between the magnetic field signal component and the intensity of the current signal and the buried depth of the high-voltage cable:
the horizontal component of the upper horizontal coil magnetic field is:
E t ＝I/(d+x)
the horizontal component of the lower horizontal coil magnetic field is:
E b ＝I/d
calculating the high-voltage cable embedding depth d according to a formula obtained by calculation:
d＝E t /(E b -E t )·X
wherein E is t Horizontal component of magnetic field measured for upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
The calculation of the horizontal distance between the high-voltage cable and the drilling position is the same as that of the calculation of the horizontal distance between the high-voltage cable and the drilling position, and the signal direction applied to the coaxial cable at the grounding box position of the high-voltage cable by the transmitter is adjusted, the original signal direction is changed from longitudinal extension to vertical transmission, so that two magnetic field strength values are obtained at the position, which is similar to the burial depth of the high-voltage cable, in the hole, and the horizontal distance value between the high-voltage cable and the hole can be calculated by the following formula in a similar way.
And (3) measuring the horizontal distance d1 between the high-voltage cable and the hole site according to a formula obtained by calculation:
d1＝E t1 /(E b1 -E t1 )·X
wherein E is t1 Vertical component of magnetic field measured for upper horizontal coil, E b1 The vertical component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
Example 2:
the embodiment provides a cable path detection system for a high-voltage cable jacking and laying section, which comprises a preliminary detection module, an electric field gradient value detection module and a calculation output module, wherein the specific functions of the modules are as follows:
the device comprises a primary detection module, a receiver and a control module, wherein the primary detection module is used for connecting a transmitter of a metal pipeline detector with an outer lead of a sheath of a high-voltage cable to be detected on the ground, the transmitter provides a harmonic current detection signal, the receiver of the metal pipeline detector receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the embedding depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal;
the electric field gradient value detection module is used for drilling a hole position at a preset distance from the preliminarily determined position of the high-voltage cable to be detected by using a drilling machine according to the preliminarily determined position and the embedding depth of the high-voltage cable to be detected, the depth of the hole position is greater than the preliminarily determined embedding depth of the high-voltage cable to be detected, an antenna of the electromagnetic induction gradiometer is placed in the hole position, and the electric field gradient values of different depth points are measured;
and the calculation output module is used for selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole site by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
Put into the hole site with the antenna of electromagnetic induction gradiometer, measure the electric field gradient value of different degree of depth points, include: the antenna is put into a hollow plastic pipe, and the electric field gradient values of all points are measured upwards sequentially at preset distance intervals from the bottom of the hole.
The calculation formula of the burying depth of the high-voltage cable is as follows:
d＝E t /(E b -E t )·X
wherein E t Horizontal component of magnetic field measured for upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A method for detecting a cable path of a high-voltage cable jacking-pipe laying section is characterized by comprising the following steps:
connecting a transmitter of a metal pipeline detector with an outer lead of a sheath of a high-voltage cable to be detected on the ground, wherein the transmitter provides a harmonic current detection signal, a receiver of the metal pipeline detector receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the embedding depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal;
according to the position and the embedding depth of the preliminarily determined high-voltage cable to be tested, drilling a hole position at a preset distance from the position of the preliminarily determined high-voltage cable to be tested by using a drilling machine, wherein the depth of the hole position is greater than the embedding depth of the preliminarily determined high-voltage cable to be tested, placing an antenna of an electromagnetic induction gradiometer into the hole position, and measuring the gradient values of electric fields of different depth points;
and selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole position by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
2. The method for detecting the cable path of the pipe-jacking and laying section of the high-voltage cable according to claim 1, wherein the output power of the transmitter of the metal pipeline detector ranges from 0W to 150W, and the maximum current is 3A.
3. The method for detecting the cable path of the pipe-jacking and laying section of the high-voltage cable according to claim 1, wherein the frequency range of the harmonic current detection signal provided by the transmitter of the metal pipeline detector is 2Hz-60 Hz.
4. The method for detecting the cable path of the pipe-jacking laying section of the high-voltage cable according to claim 3, wherein the frequency of the harmonic current detection signal provided by the transmitter of the metal pipeline detector is 4 Hz.
5. The method for detecting the cable path of the high-voltage cable jacking pipe laying section according to claim 1, wherein the step of placing an antenna of an electromagnetic induction gradiometer into a hole site and measuring the electric field gradient values of different depth points comprises the following steps: the antenna is put into a hollow plastic pipe, and the electric field gradient values of all points are measured upwards sequentially at preset distance intervals from the bottom of the hole.
6. A method for cable path detection of a high voltage cable push bench according to claim 5, wherein said predetermined distance interval is 0.10 meters.
7. The method for detecting the cable path of the jacking-laying section of the high-voltage cable according to claim 5 or 6, wherein the calculation formula of the burying depth of the high-voltage cable is as follows:
d＝E t /(E b -E t )·X
wherein E t Horizontal component of magnetic field measured for upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
8. A cable path detection system for a high voltage cable push pipe laying section, the system comprising:
the primary detection module is used for connecting a transmitter of the metal pipeline detector with a sheath outer lead of the high-voltage cable to be detected on the ground, the transmitter provides a harmonic current detection signal, a receiver of the metal pipeline detector receives a signal of a secondary magnetic field generated by secondary induced current of the cable to be detected on the ground, and the position and the burying depth of the high-voltage cable to be detected are preliminarily determined according to the strength and the distribution condition of the secondary field signal;
the electric field gradient value detection module is used for drilling a hole position at a preset distance from the preliminarily determined position of the high-voltage cable to be detected by using a drilling machine, wherein the depth of the hole position is greater than the preliminarily determined embedding depth of the high-voltage cable to be detected, placing an antenna of an electromagnetic induction gradiometer into the hole position, and measuring electric field gradient values of different depth points;
and the calculation output module is used for selecting a depth point with the maximum electric field gradient value, and respectively calculating the embedding depth of the high-voltage cable and the horizontal distance between the high-voltage cable and the hole site by adopting the magnetic field strength values of the upper horizontal coil and the lower horizontal coil obtained by a double-coil method.
9. The system of claim 8, wherein the step of placing an antenna of an electromagnetic induction gradiometer in a hole site to measure the electric field gradient values at different depth points comprises: the antenna is put into a hollow plastic pipe, and the electric field gradient values of all points are measured upwards sequentially at preset distance intervals from the bottom of the hole.
10. The system for detecting the cable path of the pipe-jacking and laying section of the high-voltage cable according to claim 9, wherein the calculation formula of the burying depth of the high-voltage cable is as follows:
d＝E t /(E b -E t )·X
wherein E t Horizontal component of magnetic field measured for upper horizontal coil, E b The horizontal component of the magnetic field measured by the lower horizontal coil, and X is the distance between the centers of the upper and lower coils.
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