CN104577364B - Small-resistance-value grounding grid of large device and design construction method - Google Patents
Small-resistance-value grounding grid of large device and design construction method Download PDFInfo
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- CN104577364B CN104577364B CN201510029924.9A CN201510029924A CN104577364B CN 104577364 B CN104577364 B CN 104577364B CN 201510029924 A CN201510029924 A CN 201510029924A CN 104577364 B CN104577364 B CN 104577364B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
- H01R4/58—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation characterised by the form or material of the contacting members
- H01R4/66—Connections with the terrestrial mass, e.g. earth plate, earth pin
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
- H01R43/00—Apparatus or processes specially adapted for manufacturing, assembling, maintaining, or repairing of line connectors or current collectors or for joining electric conductors
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Abstract
The invention provides a small-resistance-value grounding grid of a large device. The small-resistance-value grounding grid comprises horizontal grounding electrodes and vertical grounding electrodes. The horizontal grounding electrodes are arranged under the ground and are arranged vertically and horizontally to form a horizontal grounding electrode planar grid. A plurality of vertical grounding electrodes are perpendicular to the horizontal grounding electrode planar grid, are arranged at multiple joints of the horizontal grounding electrodes arranged vertically and horizontally and are connected with the horizontal grounding electrodes through arc-shaped clamps. A grounding grid extraction electrode is roughly arranged at the center of the horizontal grounding planar grid. The lower portions of the vertical grounding electrodes are arranged on thin-wall iron sheet protection cylinders, resistance reducing agents are poured into the thin-wall iron sheet protection cylinders, and the cylinder walls of the thin-wall iron sheet protection cylinders are provided with holes. The horizontal grounding electrodes are arranged in trenches, and the bottom faces of the trenches are provided with supporting rods. The horizontal grounding electrodes are fixed to the supporting rods and located in the centers of the cross sections of the trenches, and the resistance reducing agents are poured into the trenches. By means of the small-resistance-value grounding grid, the construction cost is lowered, land is saved, the small-resistance-value grounding grid is finished in a small area, the stability of the grounding effect is guaranteed, and safe and stable operation of a grounding device is guaranteed.
Description
Technical field
The invention belongs to electrical engineering, main equipment grounding technology field are built in room, and in particular to a kind of little resistance of main equipment
Value grounded screen, the invention further relates to the design and construction method of the little resistance grounded screen of main equipment.
Background technology
The CAS Institute of Modern Physics's Lanzhou heavy ion medical research center and test and debugging center first stage of the project
It is collection research and development, production, debugging and the industrial premises safeguarded, magnet power supply single device cost 5,000,000 or so in debugging, is
Avoid overvoltage, overcurrent from making device damage and suppress impact of the overcurrent to equipment debugging, nearly thing institute of the Chinese Academy of Sciences is according to meter
Calculate, it is proposed that the requirement of 0.2 Ω resistance grounded screens.It is independently of the independence of the outer otherwise designed construction of lightning protection grounding network built
Grounded screen, belongs to the design and construction category of small resistance value grounded screen.The survey magnetic grounded screen is positioned proximate to the Yellow River, one side soil
Resistivity is relatively low, on the other hand but increases difficulty of construction, and friction reducer is easily with drifting sand layer motion in vertical grounding electrode construction
Be lost in, especially vertical grounding electrode construction in easily subside, and find from ground survey report be in certain depth
Building waste and sand horsestone backfill layer so that soil resistivity has reached 67 Ω ﹒ m or so, more it is difficult to construction unit carries
Gone out only using the ㎡ of afforested areas 2000 as grounded screen land used, by can be calculated taking advantage of for floor space and grounded screen resistance
Product is 370, and general this numerical value has all reached more than 700, therefore this can be used for reference at home without any experience, using such
The grounded screen of small area is the big technical barrier that we face guaranteeing the safety of equipment.
The content of the invention
The technical problem to be solved in the present invention is to propose a kind of construct simple, good using effect, low cost, floor space
The little resistance grounded screen of little main equipment；The invention solves the problems that another technical problem be to provide that rich water high water level is large-scale to be set
The design and construction method of standby little resistance grounded screen.
The technical scheme that above-mentioned first technical problem of present invention solution is taken is as follows：A kind of little resistance ground connection of main equipment
Net, including horizontal grounding pole, vertical grounding electrode；It is characterized in that：Horizontal grounding pole is arranged at subsurface, according to laying structure in length and breadth
Into horizontal grounding polar plane net, several vertical grounding electrodes perpendicular to horizontal grounding polar plane net, be arranged on the level laid in length and breadth
Several joints of earthing pole are simultaneously connected by arc clamp with horizontal grounding pole, horizontal grounding polar plane net approximate centre position
Install grounded screen extraction pole.
The bottom of vertical grounding electrode is placed in thin-walled iron-sheet casing, and friction reducer, thin-walled iron have been poured in thin-walled iron-sheet casing cylinder
Skin casing barrel is provided with hole.
Horizontal grounding pole is arranged at groove, and trench bottom surfaces are provided with support bar, and horizontal grounding pole is fixed on support bar and position
In the middle position of trench cross-section, friction reducer is poured in groove.
The technical scheme that above-mentioned second technical problem of present invention solution is taken is as follows：A kind of rich water high water level main equipment
The design and construction method of little resistance grounded screen；It is characterized in that comprising the steps：
The measure of a, soil resistivity：In the case of being relatively dried without rainfall, weather in one week before testing, barrier will be grounded
Domain is divided into 10 × 10 meters of grid, soil resistivity test point is determined according to four-wire method after hand excavation is deep 1 meter, using ZC-8
The test of type earth resistance tester is taken after resistivity, takes maximum as design soil resistivity；The effect of hand excavation is
Ensure that soil packing is less；
The determination of b, thickness of frozen earth layer：According to thickness of frozen earth layer statistics over the years, with the maximum thickness of frozen earth layer in 10 years time limits,
Thickness of frozen earth layer is calculated as design；
The determination of c, horizontal grounding pole buried depth：Calculate soil can lead from, add maximum thickness of frozen earth layer, be defined as level and connect
Earth polar length of embedment；
The determination of d, vertical grounding electrode buried depth：It is defined as vertical grounding electrode by 1.5～3 times of horizontal grounding pole length of embedment
Length of embedment；
The determination of e, earthing material：In order to reduce cost, horizontal grounding pole, arc clamp select the zinc-plated band irons of 60 × 8mm,
Vertical grounding electrode selects Φ 150mm coating steel pipes, and grounded screen extraction pole is adopted to be changed with the copper and iron of horizontal grounding pole same cross-sectional
Part, the outgoing cable of grounded screen extraction pole adopts single Φ 240mm copper core flexible cables；
F, unwrapping wire, earth excavation：It is overall to excavate ground connection web area according to the horizontal grounding pole length of embedment that step c determines,
According to 1：1.5 gradient slope, prevents slump；Horizontal grounding pole is excavated in the ground connection web area for having excavated by the grid of 6 × 6m
Groove；And it is uniformly distributed the several vertical grounding electrode positions of releasing on grid；
G, vertical grounding electrode construction：According to the height that thin-walled iron-sheet casing is determined higher than the ordinary water level of underground water, make in advance
Thin-walled iron-sheet casing is performed, in thin-walled iron-sheet casing barrel hole is opened up；Using ramming machine vertical grounding electrode hole is excavated to vertical
Earthing pole length of embedment；Thin-walled iron-sheet casing is positioned in vertical grounding electrode hole, will be put as the coating steel pipe of vertical grounding electrode
After thin-walled iron-sheet casing geometric center, friction reducer is poured with coating steel pipe into thin-walled iron-sheet casing；Vertical grounding electrode will
Higher than more than horizontal grounding pole 20cm, to horizontal grounding pole marks eminence, galvanized steel bar is filled in inner side to friction reducer on the outside of coating steel pipe.
H, the construction of horizontal grounding pole：To be encased as the coating steel pipe of vertical grounding electrode by the use of camber clamp, it is ensured that connection
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 to be more than
5D, weld carries out anti-corrosion with iron oxide red；Simultaneously in the horizontal grounding pole groove that step f is excavated, with template support width is formed
The groove of × a height of 30 × 30cm, in trench bottom surfaces support bar is arranged, and horizontal grounding pole is fixed on support bar and is located at ditch
The middle position of groove cross section, the less rural area soil of template outside resistivity is backfilling and compacted；Form removal, pours in groove
Friction reducer；D is band iron width（60mm）；
I, process control：In vertical grounding electrode construction, complete one and surveyed once using ZC-8 types earth resistance tester
Resistance, increases vertical grounding electrode depth if not up to standard；In the construction of horizontal grounding pole, complete one group and be grounded using ZC-8 types
Resistance meter surveys a resistance, friction reducer is increased if not up to standard and pours groove；
J, ground outlet construction：Grounded screen is drawn by the use of the copper and iron bridgeware as grounded screen extraction pole, will be advance
The iron terminal of the copper and iron bridgeware being welded is welded in and is connect on the zinc-plated band iron of earthing pole as level, brush iron oxide red one time；Then
Copper tip is weldingly connected with flexible cable, the copper and iron part beyond friction reducer is exposed at and is done preservative treatment with three oily two felts；
K, soil backfill：Thickness according to per layer of 20cm in the range of 80cm on the surface of horizontal grounding pole is manually backfilled
And tamp, packing ensures more than 0.93；More than 80cm soil is backfilled according to the thickness machinery of 30 ± 5cm, it is ensured that packing
For more than 0.93；Backfill determines again Resistance of Grounding Grids and is confirmed whether to reach construction requirements after finishing.
The present invention compared with prior art, innovates the characteristics of proposing using the earth globality, is kept away by buried earthing pole
Exempt from because the drawbacks of Grounding resistance is unstable caused by seasonal variety, and under conditions of buried depth is utilized as far as possible
Reduce earth excavation quantities.
The present invention calculates soil maximum conduction distance by determining soil resistivity, with reference to local maximum thickness of frozen earth layer, really
Horizontal grounding pole buried depth is determined, soil has been tamped by formwork friction reducer is intimately associated with soil.Present invention innovation is proposed
Thin-walled iron-sheet does casing, it is to avoid friction reducer be lost in quicksand caused by consumption increase problem；Drop is poured with the mode of anti-formwork
Resist causes friction reducer to be intimately associated with soil, increases soil conductivity distance, increases thermal interface, effectively improves soil
Have big difference caused ion enrichment problem with resistance reducing agent resistivity.
Using the present invention, the grounded screen of 0.2 Ω is completed on the surface area of 2000 ㎡ so that earth resistance is not with season
Section property and change, and the mode using casing reduces construction cost, is computed, relative to the little resistance of conventional large-area construction
The construction method of grounded screen, Economization on land of the present invention saves more than 850,000 yuan of expense more than 1400 ㎡；Save construction cost
More than 50%.
The present invention completes little resistance grounded screen from the technical barrier analysis for being run in small area, using in the past simple
Buried earthing pole cannot solve the difficulty, if using special material（Such as bury copper billet）Cost is again too high；So inventor from
Set out using the premise of conventional material, by increasing vertical grounding electrode, using arc clamp connection horizontal grounding pole, level is connect
Earth polar can lead soil and be embedded in below frozen soil layer, it is ensured that the stability of earthing effect, it is ensured that grounding apparatus runs safety and stability.
The present invention is the summary of practical engineering application, and it is applied to as first heavy-ion cancer therapy equipment of China, it is ensured that its tune
Try and come into operation, improve little resistance grounded screen in the past and rely on large stretch of surface area come the present situation realized, filled up electrician
The blank of no ground net design and the method constructed in journey construction.The present invention is suitable for the limited modern main equipment of land area
Grounded screen is constructed.
Description of the drawings
Fig. 1 is the method soil resistivity test point plane of arrangement schematic diagram that the present invention is provided,
Fig. 2 is grounded screen floor map of the present invention,
Fig. 3 is horizontal grounding pole construction trench profile figure,
Fig. 4 is camber clamp structures schematic diagram,
Fig. 5 is vertical grounding electrode with thin-walled iron-sheet casing structure relation and pours the schematic diagram of friction reducer in advance,
Fig. 6 is the schematic diagram that horizontal grounding pole is connected with vertical grounding electrode by camber clamp.
In figure：1-horizontal grounding pole, 2-vertical grounding electrode, 3-grounded screen extraction pole, 4-arc clamp, 5-thin-walled
Iron sheet casing, 6-template, 7-hole, 8-friction reducer, 9-soil resistivity test point, 10-support bar, 11-level connects
Earth polar plane net, 12-groove, A-side length of element, B-horizontal grounding polar plane net side length of element, C-arc clamp and level
The earthing pole lap of splice, along the distance with vertical grounding electrode upper end on e-arc clamp.
Specific embodiment
Product embodiments, as shown in Fig. 2 and Fig. 6：A kind of little resistance grounded screen of main equipment, including horizontal grounding pole 1, hang down
Direct earth polar 2；Horizontal grounding pole 1 is arranged at subsurface, horizontal grounding polar plane net 11 is constituted according to laying in length and breadth, several vertical
Earthing pole 2 perpendicular to horizontal grounding polar plane net 11, be arranged on several joints of the horizontal grounding pole 1 laid in length and breadth and lead to
Cross arc clamp 4 to be connected with horizontal grounding pole 1, the approximate centre position of horizontal grounding polar plane net 11 arranges grounded screen extraction pole 3.
Edge is 20～30 millimeters apart from e with vertical grounding electrode upper end on arc clamp.
Referring to Fig. 5：The bottom of vertical grounding electrode 2 is placed in thin-walled iron-sheet casing 5, and in thin-walled iron-sheet casing 5 drop has been poured
Resist 8, the barrel of thin-walled iron-sheet casing 5 is provided with hole 7；Vertical grounding electrode 2 makes of Φ 150mm coating steel pipes, in coating steel pipe
Friction reducer 8 is poured.Thin-walled iron-sheet casing is highly higher than the ordinary water level of underground water.
Referring to Fig. 3：Horizontal grounding pole 1 makes of the zinc-plated band irons of 60 × 8mm, and horizontal grounding pole 1 is arranged at groove 12, groove
12 bottom surfaces are provided with support bar 10, and horizontal grounding pole 1 is fixed on support bar 10 and is located at the middle position of the cross section of groove 12, ditch
Friction reducer has been poured in groove 12.
Horizontal grounding pole 1 is arranged at below ground 5m, and vertical grounding electrode 2 is arranged at 10～15m of below ground.
Referring to Fig. 4：Arc clamp 4 makes of the zinc-plated band irons of 60 × 8mm, because vertical grounding electrode 2 is extremely put down in horizontal grounding
The position of veil 11 has different, and the arc radian of arc clamp 4 is 90 or 180 degree, arc clamp and horizontal grounding pole lap of splice C
More than 300mm.
Embodiment of the method 1, a kind of design and construction method of the little resistance grounded screen of rich water high water level main equipment；Including under
State step：
The measure of a, soil resistivity：As shown in figure 1, in the case of being relatively dried without rainfall, weather in one week before testing,
It is that side length of element A is 10 × 10 meters of grid by grounded screen region division, soil is determined according to four-wire method after hand excavation is deep 1 meter
Resistivity measurement point 9, is taken after resistivity using the test of ZC-8 types earth resistance tester, takes maximum as design electric resistance of soil
Rate.
B, horizontal grounding pole buried depth, the determination of vertical grounding electrode buried depth：By inquiring about the winter learnt maximum thickness of frozen earth layer,
Plus the optimum conduction distance of soil, horizontal grounding pole length of embedment is determined for 5.2 meters, so cutting depth is 5.2 meters；Vertically connect
Earth polar cutting depth is 2 ~ 3 times of horizontal grounding pole buried depth, is defined as 15 meters.
The determination of c, earthing material：In order to reduce cost, horizontal grounding pole, arc clamp select the zinc-plated band irons of 60 × 8mm,
Vertical grounding electrode selects Φ 150mm coating steel pipes, and grounded screen extraction pole is adopted to be changed with the copper and iron of horizontal grounding pole same cross-sectional
Part, the outgoing cable of grounded screen extraction pole adopts single Φ 240mm copper core flexible cables.
D, unwrapping wire, earth excavation：It is overall to excavate ground connection web area according to the horizontal grounding pole length of embedment that step c determines,
According to 1：1.5 gradient slope, prevents slump；As shown in Figure 2 and Figure 3, in the ground connection web area for having excavated by horizontal grounding pole
Plane net side length of element B excavates horizontal grounding pole groove 12 for the grid of 6 × 6m；And it is vertical that releasing eight is uniformly distributed on grid
The position in direct earth polar 2；
E, vertical grounding electrode construction：Referring to Fig. 5, according to the height that thin-walled iron-sheet casing is determined higher than the ordinary water level of underground water
Degree, the good thin-walled iron-sheet casing 5 of pre-production opens up hole 7 in thin-walled iron-sheet casing 5；Vertical grounding electrode is excavated using ramming machine
Hole to vertical grounding electrode length of embedment is 15 meters of relative level earthing pole surface；Thin-walled iron-sheet casing is positioned over vertical grounding electrode hole
It is interior, will be placed in after thin-walled iron-sheet casing geometric center as the coating steel pipe of vertical grounding electrode 2, into thin-walled iron-sheet casing with plating
Friction reducer 8 is poured in zinc steel pipe；Vertical grounding electrode 2 is higher than more than horizontal grounding pole 20cm, and coating steel pipe outside pours drop resistance
To at the absolute altitude of horizontal grounding pole 1, galvanized steel bar is filled in inner side for agent 8.
F, the construction of horizontal grounding pole：Referring to Fig. 6 and Fig. 3, by the use of camber clamp using as the coating steel pipe of vertical grounding electrode
Encase, it is ensured that connection is good, camber clamp two ends are welded with the zinc-plated band iron as horizontal grounding pole, welding is using overlap joint
Weldering, the lap of splice is more than 300mm, and weld carries out anti-corrosion with iron oxide red；The horizontal grounding pole groove 12 for being excavated in step d simultaneously
It is interior, the groove 12 of width × a height of 30 × 30cm is formed with the supporting of template 6, support bar 10 is set in trench bottom surfaces, horizontal grounding
Pole 1 is fixed on support bar and is located at the middle position of trench cross-section, the less rural area earthen backfill of resistivity of template outside
Compacting；Form removal, pours friction reducer in groove.
G, process control：In vertical grounding electrode construction, complete one and surveyed once using ZC-8 types earth resistance tester
Resistance, increases vertical grounding electrode depth if not up to standard；In the construction of horizontal grounding pole, complete one group and be grounded using ZC-8 types
Resistance meter surveys a resistance, friction reducer is increased if not up to standard and pours groove.
H, ground outlet construction：With copper and iron bridgeware as grounded screen extraction pole 3, grounded screen is utilized into copper and iron bridgeware
Draw, the iron terminal of the copper and iron bridgeware being welded in advance is welded in as level and is connect on the zinc-plated band iron of earthing pole, brush iron
Red one time；Then copper tip is weldingly connected with flexible cable, is exposed at the copper and iron part beyond friction reducer and does anti-with three oily two felts
Corruption is processed.
I, soil backfill：Thickness according to per layer of 20cm in the range of 80cm on the surface of horizontal grounding pole 1 is manually carried out back
Fill out and tamp, packing ensures more than 0.93；More than 80cm soil is backfilled according to the thickness machinery of 30 ± 5cm, it is ensured that closely knit
Spend for more than 0.93；Backfill determines again Resistance of Grounding Grids and is confirmed whether to reach construction requirements after finishing.
Claims (1)
1. the design and construction method of the little resistance grounded screen of a kind of rich water high water level main equipment, it is characterised in that including following
Step：
The measure of a, soil resistivity：In the case of being relatively dried without rainfall, weather in one week before testing, ground connection web area is drawn
It is divided into 10 × 10 meters of grid, soil resistivity test point is determined according to four-wire method after hand excavation is deep 1 meter, is connect using ZC-8 types
Ground resistance meter test is taken after resistivity, takes maximum as design soil resistivity；The effect of hand excavation is to ensure
Soil packing is less；
The determination of b, thickness of frozen earth layer：According to thickness of frozen earth layer statistics over the years, with the maximum thickness of frozen earth layer in 10 years time limits, as
Design calculates thickness of frozen earth layer；
The determination of c, horizontal grounding pole buried depth：Calculate soil can lead from, add maximum thickness of frozen earth layer, be defined as horizontal grounding pole
Length of embedment；
The determination of d, vertical grounding electrode buried depth：It is defined as vertical grounding electrode embedment by 1.5～3 times of horizontal grounding pole length of embedment
Depth；
The determination of e, earthing material：In order to reduce cost, horizontal grounding pole, arc clamp select the zinc-plated band irons of 60 × 8mm, vertically
Earthing pole selects Φ 150mm coating steel pipes, grounded screen extraction pole to connect using the copper and iron bridgeware with horizontal grounding pole same cross-sectional
The outgoing cable of earth mat extraction pole adopts single Φ 240mm copper core flexible cables；
F, unwrapping wire, earth excavation：It is overall to excavate ground connection web area according to the horizontal grounding pole length of embedment that step c determines, according to
1：1.5 gradient slope, prevents slump；Horizontal grounding pole groove is excavated in the ground connection web area for having excavated by the grid of 6 × 6m；
And it is uniformly distributed the several vertical grounding electrode positions of releasing on grid；
G, vertical grounding electrode construction：According to the height that thin-walled iron-sheet casing is determined higher than the ordinary water level of underground water, pre-production is good
Thin-walled iron-sheet casing, in thin-walled iron-sheet casing hole is opened up；Vertical grounding electrode hole is excavated using ramming machine to bury to vertical grounding electrode
Enter depth；Thin-walled iron-sheet casing is positioned in vertical grounding electrode hole, will be placed in thin-walled iron as the coating steel pipe of vertical grounding electrode
After skin casing geometric center, friction reducer is poured with coating steel pipe into thin-walled iron-sheet casing；Vertical grounding electrode is higher than level
More than earthing pole 20cm, coating steel pipe outside pours friction reducer to horizontal grounding pole marks eminence, and galvanized steel bar is filled in inner side；
H, the construction of horizontal grounding pole：To be encased as the coating steel pipe of vertical grounding electrode by the use of camber clamp, it is ensured that connection is good,
Camber clamp two ends are welded with the zinc-plated band iron as horizontal grounding pole, welding adopts overlap welding, the lap of splice to be more than 5D, weldering
The place of connecing carries out anti-corrosion with iron oxide red；Simultaneously in the horizontal grounding pole groove that step f is excavated, form wide × a height of with template support
The groove of 30 × 30cm, in trench bottom surfaces support bar is arranged, and horizontal grounding pole is fixed on support bar and transversal positioned at groove
The middle position in face, the less rural area soil of template outside resistivity is backfilling and compacted；Form removal, pours drop resistance in groove
Agent；D is band iron width 60mm；
I, process control：In vertical grounding electrode construction, complete one and survey a resistance using ZC-8 types earth resistance tester,
Increase vertical grounding electrode depth if not up to standard；In the construction of horizontal grounding pole, one group is completed using ZC-8 type earth resistances
Tester surveys a resistance, friction reducer is increased if not up to standard and pours groove；
J, ground outlet construction：Grounded screen is drawn by the use of the copper and iron bridgeware as grounded screen extraction pole, will be welded in advance
The iron terminal of good copper and iron bridgeware is welded on the zinc-plated band iron as horizontal grounding pole, brush iron oxide red one time；Then by copper end
Son is weldingly connected with flexible cable, is exposed at the copper and iron part beyond friction reducer and does preservative treatment with three oily two felts；
K, soil backfill：Thickness according to per layer of 20cm in the range of 80cm on the surface of horizontal grounding pole is manually backfilled and rammed
Real, packing ensures more than 0.93；More than 80cm soil according to 30 ± 5cm thickness machinery backfill, it is ensured that packing is
More than 0.93；Backfill determines again Resistance of Grounding Grids and is confirmed whether to reach construction requirements after finishing.
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| CN201510029924.9A CN104577364B (en) | 2015-01-21 | 2015-01-21 | Small-resistance-value grounding grid of large device and design construction method |
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