CN210576509U - Deep well grounding electrode - Google Patents
Deep well grounding electrode Download PDFInfo
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- CN210576509U CN210576509U CN201921398528.3U CN201921398528U CN210576509U CN 210576509 U CN210576509 U CN 210576509U CN 201921398528 U CN201921398528 U CN 201921398528U CN 210576509 U CN210576509 U CN 210576509U
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Abstract
The utility model discloses a deep well grounding electrode, which comprises a feed rod, a feed head, a steel sleeve with the diameter smaller than the borehole wall aperture of a well body, a temperature measuring optical cable, an exhaust pipe and a drainage cable; the steel sleeve is positioned in the well body, and an insulating anticorrosive coating is coated outside the steel sleeve from a certain depth to the top; the feed head is positioned at the bottom of the steel sleeve and comprises a grouting device capable of pumping coke liquid; the feed rod, the temperature measuring optical cable, the exhaust pipe and the drainage cable are positioned inside the steel sleeve; the temperature measuring optical cable extends from the bottom end of the feed rod to the monitoring module; the exhaust pipe extends from the bottom end of the feed rod to the ground, and the exhaust pipe is a double-row exhaust pipe; one end of the drainage cable is welded on the feed rod, and the other end of the drainage cable extends to the monitoring module. The utility model discloses a construction method of deep well earthing pole can realize reinforcing direct current deep part and lead the purpose of stratum diffusion well to greatly reduce earthing pole to earth's surface environment and influence.
Description
Technical Field
The utility model relates to a direct current transmission technical field especially relates to a deep well earthing pole.
Background
The grounding electrode is a key component in the monopolar earth operation in the direct current transmission project. At present, the grounding electrode technology adopted by the grounding electrode in the direct current transmission project mainly comprises a horizontal grounding electrode and a vertical grounding electrode (shallow buried). The two earth electrode technologies are mostly selected to be built at places with lower earth surface or shallow layer resistivity, and both earth surface technologies are selected to diffuse currents. The current diffuses vertically and horizontally, and the horizontal diffusion has great influence on the earth surface environment, such as direct current magnetic biasing of a center grounding transformer, accelerated corrosion of shallow buried metals (pipelines, buildings) and the like. In addition, the vertical contact area is limited, and a large amount of land is occupied.
The concept of "deep well grounding electrode" in the prior art mostly refers to a vertical grounding electrode within 100 m. For example, (1) the direct current transmission combined deep well grounding electrode is formed by connecting a plurality of good conductors on a drainage cable, and filling carbon-based filler between the drainage cable and an exhaust pipe which form a body; (2) the construction method of the direct current transmission deep well grounding electrode is characterized in that a coke body is utilized to introduce current into an underground deep quantity conducting layer, so that the current of the grounding electrode is prevented from diffusing on the ground surface; (3) the novel direct-buried deep well grounding electrode is characterized in that a grounding electrode body is arranged in a well body and consists of a grounding electrode tube body and a grounding electrode lead, and a preservative and a resistance reducing agent are filled in the grounding electrode body. In the current practical engineering application, the buried depth of the grounding electrode mentioned in the method is shallow, which is mostly within dozens of meters, and the deep well grounding electrode with hundreds of meters or even thousands of meters cannot be constructed according to the design scheme.
Therefore, a deep well grounding electrode is urgently needed.
SUMMERY OF THE UTILITY MODEL
An embodiment of the utility model provides a deep well earthing pole can realize reinforcing direct current deep part and well lead the purpose of stratum diffusion to greatly reduce earthing pole to earth's surface environment and influence.
The embodiment of the utility model provides a deep well earthing pole is arranged in a well body, include: the temperature measuring device comprises a feed rod, a feed head, a steel sleeve with the diameter smaller than the borehole wall aperture of the well body, a temperature measuring optical cable, an exhaust pipe and a drainage cable;
the steel sleeve is positioned in the well body, the distance between the top of the steel sleeve and the ground is a first clearance distance, and an insulating anticorrosive layer is coated outside the steel sleeve from a certain depth to the top;
the feed head is positioned at the bottom of the steel sleeve and comprises a grouting device capable of pumping coke liquid;
the feed rod, the temperature measuring optical cable, the exhaust pipe and the drainage cable are positioned inside the steel sleeve;
the distance between the top of the feed rod and the ground is a second clearance distance, and the feed rod extends to the second clearance distance from the bottom of the steel sleeve;
the temperature measuring optical cable extends from the bottom end of the feed rod to the monitoring module;
the exhaust pipe extends from the bottom end of the feed rod to the ground, and the exhaust pipe is a double-row exhaust pipe;
one end of the drainage cable is welded on the feed rod through a heat release welding spot, the other end of the drainage cable extends to the monitoring module, and the drainage cable is fixed on the feed rod through a bolt.
As an improvement of the scheme, the bottom of the steel sleeve is of a perforated floral tube structure.
As an improvement of the above scheme, the method further comprises the following steps: taking a certain depth as an insulation depth, taking the depth from the ground to the insulation depth as an insulation section, and taking the depth from the insulation depth to the bottom of the steel sleeve as a current dispersion section; gravel is filled in the insulating section; and coke is filled in the diffusing section.
As an improvement of the scheme, the outer part of the insulating anticorrosive layer is coated with an anticorrosive sleeve, and the anticorrosive sleeve is a PE sleeve.
The improvement of the scheme comprises 3 drainage cables, wherein each drainage cable shares 1/3 of the rated ground current value;
and the 3 cables are respectively subjected to heat release welding with the feeding rod at three depths of 400m, 600m and 800m of the well body, and lead sealing and epoxy resin coating are adopted at the heat release welding points.
As an improvement of the scheme, the temperature measuring optical cable is fixed on the feed rod through a hoop piece.
As an improvement of the scheme, the device also comprises an insulating sleeve; the insulating sleeve is coated on the feeding rod.
The embodiment of the utility model provides a pair of deep well earthing pole compares with prior art, has following beneficial effect:
the drilling deep well is isolated into an upper insulation section and a lower diffusion section, a low-carbon alloy steel feed rod with the same depth as the drilling depth is adopted to lead current to the bottom of the hole, the upper part of the feed rod is subjected to insulation treatment to form an insulation section, a diffusion section is controlled, and surface diffusion of diffusion is reduced; injecting the coke mixed liquid into a diffusion section in the deep well in a bottom grouting mode, and establishing an electronic circulation passage between the feed rod and the stratum through the coke; an exhaust pipe with holes wound by geotextile is designed to exhaust gas generated in the feed process at the bottom of a well, so that the 'gas resistance effect' is prevented; the direct current transmission current can be quickly led to a good conducting layer at the deep part of the earth from one end (such as a receiving end), is conducted through the deep part of the earth and flows out from the other end (such as a sending end) to form a current circulation loop; the direct current transmission current flows in and out of the earth shallow layer through the feed rod, after the upper part of the feed rod is subjected to insulation treatment, the current cannot be directly scattered into the earth surface from the feed rod, and the high-resistance layer coated on the current scattering section can prevent the deep current from flowing into the earth surface, so that the small earth surface diffusion current and the low potential difference in a large range can be realized, and the purpose of greatly reducing the influence of the earth electrode on the earth surface environment is realized.
Drawings
Fig. 1 is a schematic structural diagram of a deep well grounding electrode according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a deep well grounding electrode according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
Referring to fig. 1, it is a schematic structural diagram of a deep well grounding electrode provided in an embodiment of the present invention, which is located in a well body, and includes: the device comprises a feed rod (1), a feed head (2), a steel sleeve (3) with the diameter smaller than the borehole wall aperture of a well body, a temperature measurement optical cable (4), an exhaust pipe (5) and a drainage cable (6);
the steel sleeve (3) is positioned in the well body, the distance between the top of the steel sleeve (3) and the ground is a first clearance distance, and an insulating anticorrosive layer (7) is coated outside the steel sleeve (3) from a certain depth to the top;
the feed head (2) is positioned at the bottom of the steel sleeve (3), and the feed head (2) comprises a grouting device capable of pumping coke liquid;
the feed rod (1), the temperature measuring optical cable (4), the exhaust pipe (5) and the drainage cable (6) are positioned inside the steel sleeve (3);
the distance between the top of the feed rod (1) and the ground is a second clearance distance, and the feed rod (1) extends to the second clearance distance from the bottom of the steel sleeve (3);
the temperature measuring optical cable (4) extends from the bottom end of the feed rod (1) to the monitoring module;
the exhaust pipe (5) extends from the bottom end of the feed rod (1) to the ground, and the exhaust pipe (5) is a double-row exhaust pipe;
one end of the drainage cable (6) is welded on the feed rod (1) through the heat release welding spot (8), the other end of the drainage cable extends to the monitoring module, and the drainage cable (6) is fixed on the feed rod (1) through a bolt.
Preferably, geotextile is used to wrap the perforated exhaust pipe.
Furthermore, the bottom of the steel sleeve (3) is of a perforated floral tube structure.
Further, the method also comprises the following steps: taking a certain depth as an insulation depth, taking the depth from the ground to the insulation depth as an insulation section, and taking the depth from the insulation depth to the bottom of the steel sleeve (3) as a current dispersion section; gravel is filled in the insulating section; the bulk flow section is filled with coke.
Furthermore, the outside of the insulating anticorrosive layer (7) is coated with an anticorrosive sleeve, and the anticorrosive sleeve is a PE sleeve.
Furthermore, 3 drainage cables (6) are included, and each drainage cable (6) shares 1/3 of the rated ground current value; the rated current-carrying capacity of the drainage cable (6) is not less than 630A; 3 cables are respectively subjected to heat release welding with the feed rod (1) at three depths of 400m, 600m and 800m of the well body, and meanwhile, the heat release welding points are coated by lead sealing and epoxy resin. Thereby realizing the corrosion prevention of the welding spot.
Furthermore, the temperature measuring optical cable (4) is fixed on the feed rod (1) through a hoop.
Preferably, the temperature measuring optical cable (4) adopts a nonmetal high-strength drilling temperature measuring optical cable (4).
Further, the device also comprises an insulating sleeve; the insulating sleeve is coated on the feed rod (1).
In a specific embodiment, referring to fig. 2, firstly, a kilometer deep well is drilled on the natural ground, a hole expanding technology is adopted for 0-50m on the ground surface, the hole diameter is 630mm, and the hole diameter of a well wall after well cementation is 480 mm; the aperture of the well wall with the lower part of 50m-400m is 410mm, the aperture of the well wall with the bottom of 400m-1000m is 380mm, and the well wall is ensured not to collapse and leak slurry by adopting a protective arm sleeve or slurry in the drilling process; after drilling, firstly, lowering a steel sleeve (3) with the diameter of 340mm, wherein the wall thickness is 10mm, the total length of the steel sleeve (3) is 990m, the first clearance distance is 10m, the steel sleeve (3) is externally coated with an insulating anticorrosive layer (7) from the depth of 400m to the top and protected by a PE sleeve; after the steel sleeve (3) is placed, a feed head (2) is placed in the steel sleeve (3), a grouting device is arranged on the feed head (2), then feed rods (1) are welded one by one, the feed rods (1) are hollow steel pipes, the length of the feed rods is 950m, the second clearance distance is 50m, heat-releasing welding spots are adopted to weld drainage cables (6) at 400m, 600m and 800m of the feed rods (1) respectively, the drainage cables (6) are fixed on the feed rods (1) through bolts, and the drainage cables (6) are connected to a control center tower in a centralized mode to ensure centralized control of lead current; the feed rod (1) is insulated on the ground surface by an insulating sleeve (7) in a range of 50-400 m. The method comprises the steps that optical fiber temperature measuring optical cables (4) and (2) and exhaust pipes (5) and (3) are synchronously installed when a feed rod (1) is installed, the temperature measuring optical cables (4) mainly measure and early warn the temperature control condition of the full section of a deep well, the double-row exhaust pipe (5) mainly prevents gas from being generated in the well when the feed rod (1) conducts drainage, and prevents the air resistance effect, and the temperature measuring optical cables (4) and the exhaust pipes (5) are fixed on the feed rod (1) through bolts; after the feeding rod (1), the drainage cable (6), the temperature measuring optical cable (4) and the exhaust pipe (5) are completely installed, debugging and detecting the performance of the equipment, and performing coke liquid grouting after the equipment is qualified; the grouting adopts a hole bottom grouting method, and the deep well coke liquid is pumped by a grouting device of the feed rod (1) and the feed head (2), so that the deep well flow dispersing section (400-1000 m) is filled with coke; after the coke filling of the free flowing section is finished, gravel is filled in the insulating section (0m-400m), and the gravel is filled to the natural ground for reclamation and vegetation recovery.
The second embodiment of the utility model provides a deep well grounding electrode monitoring system, which comprises a deep well grounding electrode as described in any one of the first embodiment of the utility model, and a monitoring module;
the monitoring module comprises an underground grouting control unit, an underground exhaust control unit and an underground temperature monitoring unit;
the underground grouting control unit controls the grouting device to perform grouting;
the underground exhaust control unit controls the exhaust pipe (5) to exhaust;
and the underground temperature monitoring unit monitors underground temperature data acquired by the temperature measuring optical cable (4) and carries out early warning according to a preset temperature threshold value.
Preferably, the coke slurry is pumped by a feeding head (2) grouting device; the water-cement ratio of the coke slurry pumped at this time is 1: 1-1: 1.2, the density of the coke slurry is 1.20-1.40 g/cm3, the grouting pressure is 8-12 MPa, and the underground grouting unit is filled in the diffusion section completely and comprises a space between the steel sleeve (3) and the well wall, a space between the feed rod (1) and the steel sleeve (3) and a space inside the feed rod (1).
The embodiment of the utility model provides a pair of deep well earthing pole compares with prior art, has following beneficial effect:
the drilling deep well is isolated into an upper insulation section and a lower diffusion section, a low-carbon alloy steel feed rod with the same depth as the drilling depth is adopted to lead current to the bottom of the hole, the upper part of the feed rod is subjected to insulation treatment to form an insulation section, a diffusion section is controlled, and surface diffusion of diffusion is reduced; injecting the coke mixed liquid into a diffusion section in the deep well in a bottom grouting mode, and establishing an electronic circulation passage between the feed rod and the stratum through the coke; an exhaust pipe with holes wound by geotextile is designed to exhaust gas generated in the feed process at the bottom of a well, so that the 'gas resistance effect' is prevented; the direct current transmission current can be quickly led to a good conducting layer at the deep part of the earth from one end (such as a receiving end), is conducted through the deep part of the earth and flows out from the other end (such as a sending end) to form a current circulation loop; the direct current transmission current flows in and out of the earth shallow layer through the feed rod, after the upper part of the feed rod is subjected to insulation treatment, the current cannot be directly scattered into the earth surface from the feed rod, and the high-resistance layer coated on the current scattering section can prevent the deep current from flowing into the earth surface, so that the small earth surface diffusion current and the low potential difference in a large range can be realized, and the purpose of greatly reducing the influence of the earth electrode on the earth surface environment is realized.
It should be noted that the above-described device embodiments are merely illustrative, where the units described as separate parts may or may not be physically separate, and the parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment. In addition, in the drawings of the embodiment of the apparatus provided by the present invention, the connection relationship between the modules indicates that there is communication connection between them, and specifically, the connection relationship can be implemented as one or more communication buses or signal lines. One of ordinary skill in the art can understand and implement it without inventive effort.
The foregoing is a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of improvements and decorations can be made without departing from the principle of the present invention, and these improvements and decorations are also considered as the protection scope of the present invention.
Claims (7)
1. A deep well grounding electrode in a well body, comprising: the temperature measuring device comprises a feed rod, a feed head, a steel sleeve with the diameter smaller than the borehole wall aperture of the well body, a temperature measuring optical cable, an exhaust pipe and a drainage cable;
the steel sleeve is positioned in the well body, the distance between the top of the steel sleeve and the ground is a first clearance distance, and an insulating anticorrosive layer is coated outside the steel sleeve from a certain depth to the top;
the feed head is positioned at the bottom of the steel sleeve and comprises a grouting device capable of pumping coke liquid;
the feed rod, the temperature measuring optical cable, the exhaust pipe and the drainage cable are positioned inside the steel sleeve;
the distance between the top of the feed rod and the ground is a second clearance distance, and the feed rod extends to the second clearance distance from the bottom of the steel sleeve;
the temperature measuring optical cable extends from the bottom end of the feed rod to the monitoring module;
the exhaust pipe extends from the bottom end of the feed rod to the ground, and the exhaust pipe is a double-row exhaust pipe;
one end of the drainage cable is welded on the feed rod through a heat release welding spot, the other end of the drainage cable extends to the monitoring module, and the drainage cable is fixed on the feed rod through a bolt.
2. A deep well grounding electrode according to claim 1 wherein the bottom of the steel casing is of perforated floral tube construction.
3. The deep well grounding electrode of claim 2, further comprising: taking a certain depth as an insulation depth, taking the depth from the ground to the insulation depth as an insulation section, and taking the depth from the insulation depth to the bottom of the steel sleeve as a current dispersion section; gravel is filled in the insulating section; and coke is filled in the diffusing section.
4. The deep well grounding electrode of claim 3, wherein the exterior of the insulating anticorrosive layer is coated with an anticorrosive casing, and the anticorrosive casing is a PE casing.
5. The deep well grounding electrode of claim 4, comprising 3 current-conducting cables, each of said current-conducting cables sharing 1/3 of the rated value of the current entering the ground;
and the 3 cables are respectively subjected to heat release welding with the feeding rod at three depths of 400m, 600m and 800m of the well body, and lead sealing and epoxy resin coating are adopted at the heat release welding points.
6. The deep well grounding electrode of claim 5, wherein the temperature measuring cable is fixed to the feed rod by a hoop.
7. The deep well grounding electrode of claim 6, further comprising: an insulating sleeve; the insulating sleeve is coated on the feeding rod.
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| CN201921398528.3U CN210576509U (en) | 2019-08-26 | 2019-08-26 | Deep well grounding electrode |
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| CN201921398528.3U CN210576509U (en) | 2019-08-26 | 2019-08-26 | Deep well grounding electrode |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036608A1 (en) * | 2019-08-26 | 2021-03-04 | 南方电网科学研究院有限责任公司 | Deep well grounding electrode and deep well grounding electrode monitoring system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2021036608A1 (en) * | 2019-08-26 | 2021-03-04 | 南方电网科学研究院有限责任公司 | Deep well grounding electrode and deep well grounding electrode monitoring system |
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