CN112415605A - Multi-path shielding type cable, induced polarization detection device and method - Google Patents
Multi-path shielding type cable, induced polarization detection device and method Download PDFInfo
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- CN112415605A CN112415605A CN202011109923.2A CN202011109923A CN112415605A CN 112415605 A CN112415605 A CN 112415605A CN 202011109923 A CN202011109923 A CN 202011109923A CN 112415605 A CN112415605 A CN 112415605A
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- G01V—GEOPHYSICS; GRAVITATIONAL MEASUREMENTS; DETECTING MASSES OR OBJECTS; TAGS
- G01V3/00—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation
- G01V3/02—Electric or magnetic prospecting or detecting; Measuring magnetic field characteristics of the earth, e.g. declination, deviation operating with propagation of electric current
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Abstract
The invention belongs to the field of excitation detection, and provides a multi-path shielding type cable, an excitation polarization detection device and a method. The multi-path shielding type cable comprises a main cable, wherein the main cable comprises a plurality of cable cores, each cable core comprises four electrodes, the four electrodes with the same cross section form an electrode system and serve as a node of the cable, and the node corresponds to a power supply point; four electrodes in the same electrode system are simultaneously collected and switched among different electrode systems. The method is suitable for tunnel complex environment induced polarization detection, can be laid at one time, can collect multiple paths simultaneously, is simple and convenient to operate, improves detection efficiency, and reduces the influence on tunnel construction progress.
Description
Technical Field
The invention belongs to the field of excitation detection, and particularly relates to a multi-path shielding type cable, an excitation polarization detection device and a method.
Background
The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art.
In the tunnel construction process, due to the complexity and the variability of geological conditions and the limitation of the prior art, the earth surface exploration cannot find out all bad geological bodies. Therefore, the development of advanced geological forecast in the tunnel is a powerful supplement to early-stage exploration, the position and the scale of the unfavorable geologic body in front of the tunnel face are detected in advance, a construction scheme suitable for the position and the scale is formulated, and the unfavorable geologic section is safely and economically passed through.
In the current tunnel construction, the induced polarization method is a common and effective advanced geological prediction method, is a branch of an electrical method, and can be used for detecting unfavorable geologic bodies such as a water body in front of a tunnel face. The observation mode of the induced polarization method applied at present is that a measuring electrode system M and a power supply electrode A0 are arranged on the tunnel face, 4 power supply electrodes are arranged on the surrounding rock on the periphery of the rear side of the measuring electrode system to form a power supply electrode system A, and a power supply electrode B and a power supply electrode N are located at the rear infinite distance of the tunnel. During detection, 4 power supply electrode systems A supply the same current, the measuring electrode M measures the potential, after the measurement of each measuring electrode in the array measuring electrode system is finished, the power supply electrode system A moves towards the back of the palm surface, the potential of the array electrode M is continuously measured until the power supply electrode system moves to a preset position, and the detection is finished, as shown in figure 1.
In tunnel construction, especially in TBM construction tunnels, the construction process is very compact, and the time for forecasting is limited, so that the detection efficiency is improved, and the advance geological forecast is very important without influencing the construction progress. The cable is used as an important device for detection by an induced polarization method, and the inventor finds that in the traditional tunnel construction (except for a carrying type instrument), the surrounding rock electrode running can be only carried out by a single electrode point, the personnel point changing and collecting efficiency is low, and the detection time is long.
Disclosure of Invention
In order to solve the above problems, a first aspect of the present invention provides a multi-path shielded cable, which is suitable for induced polarization detection in a complex tunnel environment, can be laid at one time, can collect multiple paths simultaneously, is simple and convenient to operate, improves detection efficiency, and reduces the influence on the tunnel construction progress.
In order to achieve the purpose, the invention adopts the following technical scheme:
a multi-path shielding type cable comprises a main cable, wherein the main cable comprises a plurality of cable cores, each cable core comprises four electrodes, the four electrodes with the same cross section form an electrode system and serve as a node of the cable, and the node corresponds to a power supply point position; four electrodes in the same electrode system are simultaneously collected and switched among different electrode systems.
A second aspect of the invention provides an induced polarization detection apparatus comprising a multiple shielded cable as described above.
A third aspect of the present invention provides a method of using an induced polarization detection apparatus, comprising:
installing a plurality of shielding cables in a TBM wire slot, and fixing the node position according to the power supply electrode point position;
connecting the conductor wire core on the node with a power supply electrode, and fixing the position of the power supply electrode to be coupled with surrounding rock;
setting the detection host machine into four paths for simultaneous acquisition, and sequentially detecting backwards from the first circle of electrode system according to the mark number;
and disconnecting the cable from the power supply electrode, and finishing acquisition.
The invention has the beneficial effects that:
(1) according to the multi-path shielding type cable suitable for induced polarization detection in a complex environment of a tunnel, provided by the invention, multi-path electrodes are integrated into one main cable, data acquisition of detection point positions can be completed by one-time arrangement, the main cable can be carried in a TBM wire slot, the work of installing and detecting before detection to complete cable collection is omitted, and the detection efficiency is improved.
(2) The four electrodes of the same electrode system in the cable can be powered simultaneously to carry out induced polarization detection, and the data acquisition speed is greatly improved.
(3) The multi-turn electrode system of the cable is integrated into the main cable, the power supply electrode is controlled by the host machine, automatic switching among different electrode systems is realized, the time and labor configuration for electrode running are saved, and the detection time and labor cost are saved.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic view of an electrode arrangement of a conventional induced polarization method;
FIG. 2 is a schematic diagram of a multiple shielded cable assembly according to an embodiment of the present invention;
FIG. 3 is a cross-sectional view of a multi-path shielded electrical cable according to an embodiment of the present invention;
fig. 4 is a single core structure diagram of the multi-path shielded cable according to the embodiment of the invention.
The cable comprises a main cable, a cable core, a shielding copper net, an insulating sheath, a conductor wire core, a shielding cross net and 4-mixed gel, wherein the main cable comprises 1-a main cable rubber sheath, 2-nodes, 3-the cable core, 31-the shielding copper net, 32-the insulating sheath, 33-the conductor wire core, 34-the shielding cross net and 4-the mixed gel.
Detailed Description
The invention is further described with reference to the following figures and examples.
It is to be understood that the following detailed description is exemplary and is intended to provide further explanation of the invention as claimed. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.
It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of exemplary embodiments according to the invention. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.
In the present invention, terms such as "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "side", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only terms of relationships determined for convenience of describing structural relationships of the parts or elements of the present invention, and are not intended to refer to any parts or elements of the present invention, and are not to be construed as limiting the present invention.
In the present invention, terms such as "fixedly connected", "connected", and the like are to be understood in a broad sense, and mean either a fixed connection or an integrally connected or detachable connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be determined according to specific situations by persons skilled in the relevant scientific or technical field, and are not to be construed as limiting the present invention.
As shown in fig. 2, the multi-path shielded cable of this embodiment includes a main cable, where the main cable includes a plurality of cable cores, each cable core includes four electrodes, the four electrodes with the same cross section form an electrode system and serve as a node 2 of the cable, and the node corresponds to a power supply point; four electrodes in the same electrode system are simultaneously collected and switched among different electrode systems.
For example: the 1 st circle of electrodes are two electrodes L1 on the left, and the electrodes corresponding to the upper and lower parts are respectively on the L1 and under the L1; similarly, the two electrodes on the right side R1 corresponding to the upper and lower parts are respectively on R1 and under R1, and so on. In the data acquisition process, the induced polarization method can be used for simultaneously acquiring four paths of electrodes in the same electrode system and switching different electrode systems according to instructions.
The main cable can be directly carried in the TBM wire casing, and only once laying can carry out subsequent detection, and is simple and convenient, and node 2 corresponds corresponding power supply electrode electric potential, and the conductor sinle silk is divided into L side and R side according to left and right sides electrode electric potential. Lay and accomplish and be connected with the power supply electrode after, four ways of electrodes on same node can supply power simultaneously, according to instruction automatic switch-over between the different nodes, and collection efficiency improves greatly, also removes artifical race utmost point from, practices thrift the human cost.
As shown in fig. 3, a cross-section of a total cable, which has a shielding layer. Five groups of cable cores 3 are contained in the main cable rubber sheath 1, four paths of electrodes are arranged in the cable cores 3 and are power supply electrodes, and mixed gel 4 is filled in gaps among the cable cores 3.
As shown in fig. 4, the overall structure of the cable core is shown, the inside of the main cable is connected with a shielding copper net 31, and the outside of the main cable is provided with a rubber sheath 32. Wherein the conductor core 33, the shielding cross net 34 and the interior are filled with the hybrid gel 4.
The main cable is externally provided with a circular rubber sheath, the inside of the main cable is connected with a shielding copper net, a plurality of cable cores with a power supply function are arranged inside the TBM wire slot, and the arrangement time is saved.
A plurality of nodes are distributed on the main cable according to the distance between the power supply electrodes, and the nodes are used as the exposed parts of the cable cores and are connected with the power supply electrodes.
Wherein, the cable core has a shielding layer and the outside of the cable core is an insulating layer. The four wire cores in the cable core are separated by an internal cross shielding copper net. The shielding copper mesh and the shielding cross mesh of the embodiment play roles in shielding external electromagnetic radiation interference and interference between the wire cores of the internal conductors, and stability is guaranteed.
The present embodiment also provides an induced polarization detection apparatus comprising a multiple shielded cable as described above.
This embodiment is through laying induced polarization detection cable in the TBM wire inslot, and increase the node function, every node is four ways power supply sinle silk, it is integrated to a cable core to have realized many rings of electrodes, the situation of laying power supply electrode or can only artifical single-point and carrying out the detection many times has been avoided, and after fixing power supply electrode, single-ring four ways electrode can gather simultaneously, single-point collection efficiency improves more than 4 times before than, can automatic switch between the follow-up ring electrode, once lay has been realized, continuous data acquisition, the cost of labor has been reduced when having improved detection efficiency greatly.
Meanwhile, strong external electromagnetic radiation interference is shielded between the cable cores through the shielding copper mesh, and internal outward radiation is also prevented; the shielding cross net prevents the conductor cores from interfering with each other when simultaneously supplying power. The upper node of the main cable can be increased or decreased according to the actual situation on site, the detection of electrode rings with different numbers can be realized, and the purpose of increasing the number of detection turns can be achieved by moving the cable after five rings of electrodes are detected.
The detection method using the induced polarization detection apparatus of the present embodiment includes:
step 1: installing a plurality of shielding cables in a TBM wire slot, and fixing the node position according to the power supply electrode point position;
step 2: connecting the conductor wire core on the node with a power supply electrode, and fixing the position of the power supply electrode to be coupled with surrounding rock; for the first ring electrode example, the connections are labeled as L1 up, L1 down, R1 up and R1 down.
And step 3: setting the detection host machine into four paths for simultaneous acquisition, and sequentially detecting backwards from the first circle of electrode system according to the mark number;
and 4, step 4: and disconnecting the cable from the power supply electrode, and finishing acquisition.
This embodiment once only lays the completion with multichannel cable at TBM shield rear, and an electrode system is constituteed to a cross-section four ways electrode, lays after accomplishing, and the four ways electrode of same electrode system can carry out data acquisition simultaneously, and can incessantly switch between the electrode system, has shortened data acquisition time greatly, does not need artifical single point to run utmost point or many people four ways to gather and accomplish and run utmost point, has reduced the cost of labor when improving detection efficiency.
The above description is only a preferred 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 (10)
1. A multi-path shielding type cable is characterized by comprising a main cable, wherein the main cable comprises a plurality of cable cores, each cable core comprises four electrodes, the four electrodes with the same cross section form an electrode system and serve as a node of the cable, and the node corresponds to a power supply point position; four electrodes in the same electrode system are simultaneously collected and switched among different electrode systems.
2. The multiple shielded cable of claim 1, wherein the aggregate cable is disposable within a TBM wireway.
3. The multiple shielded cable of claim 1 wherein said trunk and core each have a shield.
4. The multiple shielded electrical cable of claim 1 wherein the outside of the main cable is a rubber sheath.
5. The multiple shielded electrical cable of claim 1 wherein the inner portion of the main cable is connected to a shielding copper mesh.
6. The multiple shielded cable of claim 1, wherein the plurality of nodes are distributed on the main cable at intervals corresponding to the feeding electrodes, and the nodes are exposed as the cable cores and connected to the feeding electrodes.
7. The multiple shielded cable of claim 1 wherein the core is surrounded by an insulating layer.
8. The multiple shielded electrical cable of claim 1 wherein the four wire cores within the cable core are separated by an internal cross-shield copper mesh.
9. An induced polarization detection device comprising a multiple shielded cable according to any one of claims 1-8.
10. A detection method using the induced polarization detection apparatus according to claim 9, comprising:
installing a plurality of shielding cables in a TBM wire slot, and fixing the node position according to the power supply electrode point position;
connecting the conductor wire core on the node with a power supply electrode, and fixing the position of the power supply electrode to be coupled with surrounding rock;
setting the detection host machine into four paths for simultaneous acquisition, and sequentially detecting backwards from the first circle of electrode system according to the mark number;
and disconnecting the cable from the power supply electrode, and finishing acquisition.
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| CN202011109923.2A CN112415605B (en) | 2020-10-16 | 2020-10-16 | Multi-path shielding type cable, induced polarization detection device and method |
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| CN202011109923.2A CN112415605B (en) | 2020-10-16 | 2020-10-16 | Multi-path shielding type cable, induced polarization detection device and method |
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| CN112415605B CN112415605B (en) | 2022-05-13 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311487A (en) * | 2021-05-18 | 2021-08-27 | 山东大学 | Frequency domain induced polarization advanced water detection method and device for tunnel face emission |
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| CN103645514A (en) * | 2013-12-25 | 2014-03-19 | 山东大学 | Underground engineering advanced detection method and system for resistivity of multi-same-source electrode array |
| CN103645495A (en) * | 2013-12-24 | 2014-03-19 | 山东大学 | Multi-core distributed cable system for induced polarization method geological advanced prediction |
| WO2015043314A1 (en) * | 2013-09-30 | 2015-04-02 | 深圳市钡盛机电设备有限公司 | Segmented-centralized-type high-density electrical method measurement system and application thereof |
| CN105334541A (en) * | 2015-12-01 | 2016-02-17 | 山东大学 | Portable resistivity method advanced forecasting system and method applicable to TBM |
| CN211150141U (en) * | 2019-12-23 | 2020-07-31 | 湖北尚德金力电线电缆有限公司 | Shielding control cable |
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2020
- 2020-10-16 CN CN202011109923.2A patent/CN112415605B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2015043314A1 (en) * | 2013-09-30 | 2015-04-02 | 深圳市钡盛机电设备有限公司 | Segmented-centralized-type high-density electrical method measurement system and application thereof |
| CN103645495A (en) * | 2013-12-24 | 2014-03-19 | 山东大学 | Multi-core distributed cable system for induced polarization method geological advanced prediction |
| CN103645514A (en) * | 2013-12-25 | 2014-03-19 | 山东大学 | Underground engineering advanced detection method and system for resistivity of multi-same-source electrode array |
| CN105334541A (en) * | 2015-12-01 | 2016-02-17 | 山东大学 | Portable resistivity method advanced forecasting system and method applicable to TBM |
| CN211150141U (en) * | 2019-12-23 | 2020-07-31 | 湖北尚德金力电线电缆有限公司 | Shielding control cable |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113311487A (en) * | 2021-05-18 | 2021-08-27 | 山东大学 | Frequency domain induced polarization advanced water detection method and device for tunnel face emission |
| CN113311487B (en) * | 2021-05-18 | 2022-08-09 | 山东大学 | Frequency domain induced polarization advanced water detection method and device for tunnel face emission |
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