CN204375987U - The little resistance ground network of main equipment - Google Patents
The little resistance ground network of main equipment Download PDFInfo
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- CN204375987U CN204375987U CN201520042290.6U CN201520042290U CN204375987U CN 204375987 U CN204375987 U CN 204375987U CN 201520042290 U CN201520042290 U CN 201520042290U CN 204375987 U CN204375987 U CN 204375987U
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Abstract
The little resistance ground network of a kind of main equipment, comprises horizontal grounding pole, vertical grounding electrode; Horizontal grounding pole being arranged at subsurface, forming horizontal grounding polar plane net according to laying in length and breadth, several vertical grounding electrode is perpendicular to horizontal grounding polar plane net, the several joint being arranged on the horizontal grounding pole of laying in length and breadth being connected with horizontal grounding pole by arc clamp, and horizontal grounding polar plane net approximate centre position arranges ground network extraction pole.The bottom of vertical grounding electrode is placed in thin-walled iron-sheet casing, has built resistance reducing agent in thin-walled iron-sheet casing cylinder, and thin-walled iron-sheet casing barrel is provided with hole.Horizontal grounding pole is arranged at groove, and trench bottom surfaces is provided with support bar, and horizontal grounding pole to be fixed on support bar and to be positioned at the middle position of trench cross-section, has built resistance reducing agent in groove.The utility model reduces construction cost, Economization on land, completes little resistance ground network, guarantee the stability of earthing effect in small size, ensures that grounding apparatus security of operation is stablized.
Description
Technical field
The utility model belongs to room and builds electrical engineering, main equipment grounding technology field, is specifically related to the little resistance ground network of a kind of main equipment.
Background technology
The industrial premises that the CAS Institute of Modern Physics's Lanzhou heavy ion medical research center and test and debugging center first stage of the project are collection research and development, production, debugging and safeguard, magnet power supply single device cost about 5,000,000, in debugging, in order to avoid overvoltage, overcurrent make device damage and suppress overcurrent on the impact of equipment debugging, nearly thing institute of the Chinese Academy of Sciences, according to calculating, proposes the requirement of 0.2 Ω resistance ground network.It is the independent grounding net of the outer otherwise designed construction of lightning protection grounding network independent of building, belongs to the design and construction category of small resistance value ground network.The Yellow River is closed in this survey magnetic ground network position, soil resistivity is lower on the one hand, but difficulty of construction is increased on the other hand, in vertical grounding electrode construction, resistance reducing agent easily runs off with drifting sand layer motion, especially easily subside in vertical grounding electrode construction, and from ground survey report, find it is building waste and sand horsestone backfill layer in certain depth, soil resistivity is made to reach 67 Ω ﹒ about m, more difficult is that construction unit proposes only using the land used of afforested areas 2000 ㎡ as ground network, be 370 by can be calculated the product of floor space and ground network resistance, and generally this numerical value all reaches more than 700, therefore this can use for reference without any experience at home, use the ground network of small size like this to guarantee the safety of equipment, it is the large technical barrier that we face.
Summary of the invention
The technical problems to be solved in the utility model is to provide a kind of little resistance ground network of main equipment simple, result of use is good, cost is low, floor space is little of constructing.
It is as follows that the utility model solves the problems of the technologies described above the technical scheme taked: the little resistance ground network of a kind of main equipment, comprises horizontal grounding pole, vertical grounding electrode; It is characterized in that: horizontal grounding pole being arranged at subsurface, forming horizontal grounding polar plane net according to laying in length and breadth, several vertical grounding electrode is perpendicular to horizontal grounding polar plane net, the several joint being arranged on the horizontal grounding pole of laying in length and breadth being connected with horizontal grounding pole by arc clamp, and horizontal grounding polar plane net approximate centre position arranges ground network extraction pole.
The bottom of vertical grounding electrode is placed in thin-walled iron-sheet casing, has built resistance reducing agent in thin-walled iron-sheet casing cylinder, and thin-walled iron-sheet casing barrel is provided with hole.
Horizontal grounding pole is arranged at groove, and trench bottom surfaces is provided with support bar, and horizontal grounding pole to be fixed on support bar and to be positioned at the middle position of trench cross-section, has built resistance reducing agent in groove.
The utility model compared with prior art, innovation proposes the feature utilizing the earth globality, avoided the drawback of the Grounding resistance instability caused because of seasonal variety by buried earth electrode, and decrease earth excavation quantities under the condition utilizing buried depth as far as possible.
The utility model, by measuring soil resistivity, calculates soil maximum conduction distance, in conjunction with local maximum thickness of frozen earth layer, determines horizontal grounding pole buried depth, by formwork compacting soil, resistance reducing agent is combined closely with soil.The utility model innovation proposes thin-walled iron-sheet and does casing, avoids resistance reducing agent and to run off the consumption increase problem caused with quicksand; Building resistance reducing agent by the mode of anti-formwork makes resistance reducing agent closely be combined with soil, increases soil conductivity distance, increases thermal interface, effectively improves soil and the excessive ion enrichment problem caused of resistance reducing agent resisitivity.
Utilize the utility model, the surface area of 2000 ㎡ completes the ground network of 0.2 Ω, earth resistance is not changed with seasonality, and utilize the mode of casing to reduce construction cost, as calculated, relative to the construction method of the little resistance ground network of large-area construction in the past, the utility model Economization on land, more than 1400 ㎡, reduces expenses more than 850,000 yuan; Save construction cost more than 50%.
The utility model, from run into technical barrier analysis, completes little resistance ground network in small size, adopt simple buried earth electrode in the past cannot solve this difficulty, if adopt special material (as burying copper billet underground) cost too high again; So utility model people is from the prerequisite using conventional material, by increasing vertical grounding electrode, utilizing arc clamp to connect horizontal grounding pole, soil can be led in horizontal grounding pole and be embedded in below frozen soil layer, guarantee the stability of earthing effect, ensure that grounding apparatus security of operation is stablized.
The utility model is the summary of practical engineering application, it is applied to as China's first heavy-ion cancer therapy equipment, guarantee its debugging and come into operation, improve the present situation that little resistance ground network in the past relies on large stretch of surface area to realize, fill up the blank of the method for no ground net design and construction in electric engineering construction.The utility model is applicable to the limited modern main equipment ground network construction of land area.
Accompanying drawing explanation
Soil resistivity test point plane of arrangement schematic diagram when Fig. 1 is the utility model application,
Fig. 2 is the utility model ground network floor map,
Fig. 3 is horizontal grounding pole construction trench profile figure,
Fig. 4 is camber clamp structures schematic diagram,
Fig. 5 is vertical grounding electrode and thin-walled iron-sheet casing structure relation and the schematic diagram of building resistance reducing agent in advance,
Fig. 6 is the schematic diagram that horizontal grounding pole is connected by camber clamp with vertical grounding electrode.
In figure: 1-horizontal grounding pole, 2-vertical grounding electrode, 3-ground network extraction pole, 4-arc clamp, 5-thin-walled iron-sheet casing, 6-template, 7-hole, 8-resistance reducing agent, 9-soil resistivity test point, 10-support bar, 11-horizontal grounding polar plane net, 12-groove, A-grid length of side, B-horizontal grounding polar plane net grid length of side, C-arc clamp and the horizontal grounding pole lap of splice, along the distance with vertical grounding electrode upper end on e-arc clamp.
Embodiment
Embodiment, as shown in Fig. 2 and Fig. 6: the little resistance ground network of a kind of main equipment, comprises horizontal grounding pole 1, vertical grounding electrode 2; Horizontal grounding pole 1 being arranged at subsurface, forming horizontal grounding polar plane net 11 according to laying in length and breadth, several vertical grounding electrode 2 is perpendicular to horizontal grounding polar plane net 11, the several joint being arranged on the horizontal grounding pole 1 of laying in length and breadth being connected with horizontal grounding pole 1 by arc clamp 4, and horizontal grounding polar plane net 11 approximate centre position arranges ground network extraction pole 3.On arc clamp, edge is 20 ~ 30 millimeters with the distance e of vertical grounding electrode upper end.
See Fig. 5: the bottom of vertical grounding electrode 2 is placed in thin-walled iron-sheet casing 5, built resistance reducing agent 8 in thin-walled iron-sheet casing 5, thin-walled iron-sheet casing 5 barrel is provided with hole 7; Vertical grounding electrode 2 Φ 150mm coating steel pipe makes, and has built resistance reducing agent 8 in coating steel pipe.Thin-walled iron-sheet casing height is higher than the ordinary water level of underground water.
See Fig. 3: the horizontal grounding pole 1 zinc-plated band iron of 60 × 8mm makes, horizontal grounding pole 1 is arranged at groove 12, groove 12 bottom surface is provided with support bar 10, and horizontal grounding pole 1 to be fixed on support bar 10 and to be positioned at the middle position of groove 12 cross section, has built resistance reducing agent in groove 12.
Horizontal grounding pole 1 is arranged at below ground 5m, and vertical grounding electrode 2 is arranged at below ground 10 ~ 15m.
See Fig. 4: the arc clamp 4 zinc-plated band iron of 60 × 8mm makes, and because vertical grounding electrode 2 has different in the position of horizontal grounding polar plane net 11, the arc radian of arc clamp 4 is 90 or 180 degree, and arc clamp and horizontal grounding pole lap of splice C are greater than 300mm.
The utility model is applied to Fu Shui high water level, and its design and construction method comprises the steps:
The mensuration of a, soil resistivity: as shown in Figure 1, when drier without rainfall, weather in one week before testing, to be grid length of side A by ground network Region dividing the be grid of 10 × 10 meters, according to four-wire method determination soil resistivity test point 9 after dark 1 meter of hand excavation, after utilizing the test of ZC-8 type earth resistance tester to get resistivity, get maximum as design soil resistivity.
The determination of b, horizontal grounding pole buried depth, vertical grounding electrode buried depth: by inquiring about the maximum thickness of frozen earth layer in winter learnt, adds soil optimum conduction distance, determines horizontal grounding pole burial depth and cutting depth; Vertical grounding electrode cutting depth is 2 ~ 3 times of horizontal grounding pole buried depth.
The determination of c, earthing material: in order to reduce cost, the zinc-plated band iron of 60 × 8mm is selected in horizontal grounding pole, arc clamp, vertical grounding electrode selects Φ 150mm coating steel pipe, ground network extraction pole adopts the copper iron bridgeware with horizontal grounding pole same cross-sectional, and the outgoing cable of ground network extraction pole adopts single core Φ 240mm copper core flexible cable.
D, unwrapping wire, earth excavation: the horizontal grounding pole burial depth determined according to step c, overall excavation ground network region, puts slope according to the gradient of 1:1.5, prevents slump; As shown in Figure 2 and Figure 3, the grid being 6 × 6m in the ground network region of having excavated by horizontal grounding polar plane net grid length of side B excavates horizontal grounding pole groove 12; And on grid, be uniformly distributed the position of releasing eight vertical grounding electrodes 2;
E, vertical grounding electrode are constructed: see Fig. 5, according to the height of the ordinary water level determination thin-walled iron-sheet casing higher than underground water, make thin-walled iron-sheet casing 5 in advance, offer hole 7 at thin-walled iron-sheet casing 5; Ramming machine is utilized to excavate vertical grounding electrode hole to vertical grounding electrode burial depth and 15 meters, relative level earth electrode surface; Thin-walled iron-sheet casing is positioned in vertical grounding electrode hole, using as after the coating steel pipe of vertical grounding electrode 2 is placed in thin-walled iron-sheet casing geometric center, in thin-walled iron-sheet casing with in coating steel pipe, builds resistance reducing agent 8; Vertical grounding electrode 2 is higher than horizontal grounding pole more than 20cm, and build resistance reducing agent 8 outside coating steel pipe to absolute altitude place, horizontal grounding pole 1, galvanized steel bar is filled in inner side.
F, the construction of horizontal grounding pole: see Fig. 6 and Fig. 3, camber clamp is utilized to be encased by the coating steel pipe as vertical grounding electrode, ensure to connect well, camber clamp two ends are welded with the zinc-plated band iron as horizontal grounding pole, welding adopts overlap welding, the lap of splice is greater than 300mm, and weld iron oxide red carries out anticorrosion; Simultaneously in the horizontal grounding pole groove 12 that steps d is excavated, the groove 12 that wide × height is 30 × 30cm is formed with template 6 supporting, in trench bottom surfaces, support bar 10 is set, horizontal grounding pole 1 be fixed on support bar and be positioned at the middle position of trench cross-section, being backfilling and compacted with the rural area soil that resistivity is less outside template; Form removal, builds resistance reducing agent in groove.
G, ground outlet construction: with copper iron bridgeware as ground network extraction pole 3, ground network utilized copper iron bridgeware to draw, using the iron terminal soldering of the copper iron bridgeware welded in advance in connecing on the zinc-plated band iron of earth electrode as level, brush iron oxide red one time; Then copper tip and flexible cable are weldingly connected, are exposed at copper iron part beyond resistance reducing agent and do preservative treatment with three oily two felts.
H, soil backfill: manually carry out backfilling and tamping according to the thickness of 20cm every layer within the scope of horizontal grounding pole 1 on the surface 80cm, packing ensures more than 0.93; More than 80cm soil, according to the thickness machinery backfill of 30 ± 5cm, ensures that packing is more than 0.93; Again measure Resistance of Grounding Grids after backfill to be confirmed whether to reach construction requirements.
Claims (5)
1. the little resistance ground network of main equipment, comprises horizontal grounding pole, vertical grounding electrode; It is characterized in that: horizontal grounding pole (1) being arranged at subsurface, forming horizontal grounding polar plane net (11) according to laying in length and breadth, several vertical grounding electrode (2) is perpendicular to horizontal grounding polar plane net (11), the several joint being arranged on the horizontal grounding pole (1) of laying in length and breadth being connected with horizontal grounding pole (1) by arc clamp (4), and horizontal grounding polar plane net (11) approximate centre position arranges ground network extraction pole (3).
2. the little resistance ground network of a kind of main equipment as claimed in claim 1, it is characterized in that: the bottom of vertical grounding electrode (2) is placed in thin-walled iron-sheet casing (5); built resistance reducing agent (8) in thin-walled iron-sheet casing (5) cylinder, and thin-walled iron-sheet casing (5) barrel is provided with hole (7).
3. the little resistance ground network of a kind of main equipment as claimed in claim 2, it is characterized in that: horizontal grounding pole (1) is arranged at groove (12), groove (12) bottom surface is provided with support bar (10), horizontal grounding pole (1) is fixed on support bar (10) and goes up and the middle position being positioned at groove (12) cross section, and groove has built resistance reducing agent in (12).
4. the little resistance ground network of a kind of main equipment as described in claim 1,2 or 3, is characterized in that: vertical grounding electrode (2) Φ 150mm coating steel pipe makes, and has built resistance reducing agent (8) in coating steel pipe.
5. the little resistance ground network of a kind of main equipment as claimed in claim 4, it is characterized in that: horizontal grounding pole (1) makes of the zinc-plated band iron of 60 × 8mm, arc clamp (4) the zinc-plated band iron of 60 × 8mm makes, the arc radian of arc clamp (4) is 90 or 180 degree, and arc clamp and the horizontal grounding pole lap of splice (C) are greater than 300mm; On arc clamp, edge is 20 ~ 30 millimeters with the distance (e) of vertical grounding electrode upper end.
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| CN201520042290.6U CN204375987U (en) | 2015-01-21 | 2015-01-21 | The little resistance ground network of main equipment |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577364A (en) * | 2015-01-21 | 2015-04-29 | 中铁二十一局集团第二工程有限公司 | Small-resistance-value grounding grid of large device and design construction method |
| CN107910663A (en) * | 2017-10-19 | 2018-04-13 | 中国电建集团河北省电力勘测设计研究院有限公司 | The grounding net of transformer substation and its design method of a kind of Frozen Ground Area |
-
2015
- 2015-01-21 CN CN201520042290.6U patent/CN204375987U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104577364A (en) * | 2015-01-21 | 2015-04-29 | 中铁二十一局集团第二工程有限公司 | Small-resistance-value grounding grid of large device and design construction method |
| CN107910663A (en) * | 2017-10-19 | 2018-04-13 | 中国电建集团河北省电力勘测设计研究院有限公司 | The grounding net of transformer substation and its design method of a kind of Frozen Ground Area |
| CN107910663B (en) * | 2017-10-19 | 2019-07-16 | 中国电建集团河北省电力勘测设计研究院有限公司 | A kind of grounding net of transformer substation and its design method of Frozen Ground Area |
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