CN105514627A - Grounding disc device used for concrete telegraph pole - Google Patents
Grounding disc device used for concrete telegraph pole Download PDFInfo
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- CN105514627A CN105514627A CN201410502651.0A CN201410502651A CN105514627A CN 105514627 A CN105514627 A CN 105514627A CN 201410502651 A CN201410502651 A CN 201410502651A CN 105514627 A CN105514627 A CN 105514627A
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Abstract
The invention relates to a grounding disc device used for a concrete telegraph pole. The grounding disc device is constituted by a bottom plate, supporting columns disposed on the bottom plate, and fixed hoop connected with the top ends of the supporting columns. The grounding disc device is characterized in that the supporting columns are disposed on the periphery of the bottom plate, and the adjacent supporting columns are parallely arranged; the size of the bottom plate is cooperated with the size of the fixed hoop, and the fixed hoop is connected with a grounding disc lead. By adopting the grounding disc device, the damage on the road surface can be reduced, and the compensation costs can be greatly reduced. Under the same topographical and geological condition, the grounding resistance value of the grounding disc is lower than that of the grounding tube, and the low lightning current back flashover voltage can be reduced, and then the lightning resistant level of the line can be improved, and the power failure accident can be reduced. The construction operation intensity of the workers can be greatly reduced, and the construction quality can be guaranteed, and therefore the object of improving the working efficiency can be achieved.
Description
Technical field
The present invention relates to overhead transmission line lightning protection and cement electric pole to construct the technical field of vertical rod, specifically a kind of " grounding disc " integrating both the anti-settling round bottom dish of cement electric pole and earth electrode function, substitutes cement electric pole anti-settling cement round bottom dish and anti-lightning strike ground pipe respectively.
Background technology
At present, the former employing plain conductor of District of Shanghai 10kV distribution line, can not cause line-outage contingency during thunderbolt.Along with the significantly increase of power consumption, a large amount of 10kV circuit enters into city.The accidents such as short circuit are caused to occur for avoiding the reasons such as high-altitude junk.District of Shanghai 10kV distribution line has popularized application insulated conductor in an all-round way.There is line-outage contingency when being struck by lightning for avoiding insulated conductor, every root cement pole must be installed by earthing device.
Along with the significantly increase of power consumption, have employed large-section lead and the higher cement pole of intensity, for preventing cement pole from sinking, bottom set dish must be divided at every root cement pole.
Workman is in the anti-settling round bottom dish process of installation, and when bar position, periphery has other pipelines, when can not arrange chassis, can only abandon and be transported to on-the-spot round bottom dish, look for some stones, fragment of brick is placed on the end, hole and replaces round bottom dish.Bar hole excavation area is comparatively large, and road pavement is damaged also large, and damages (road surface reparation etc.) is significantly increased.
Ground pipe, in installation ground pipe process, for reducing the damage of road pavement, being arranged on apart from cement pole 0.3m (outer, bar hole) left and right, making grounding resistance not reach designing requirement by workman.The more difficult bar position of ground pipe is arranged to color guidance tape road surface etc., then ground pipe is not set, the cement pole that ground pipe and grounding resistance do not reach 10 Ω is not set, when being struck by lightning, lightning current counterattack voltage is easy to make insulator arc-over on this cement pole, causes phase fault accident.
Summary of the invention
The object of the present invention is to provide a kind of grounding disc device for cement electric pole of improvement, it can overcome anti-settling round bottom dish and ground pipe in prior art and arrange inconvenience, easily causes the some shortcomings that pavement damage or short circuit accident occur.
To achieve these goals, technical scheme of the present invention is: a kind of grounding disc device for cement electric pole, it is characterized in that: described grounding disc device is by base plate, the support column be located on base plate, and the fixing unit to be connected with support column top binds round and forms, support column is arranged at the surrounding of base plate, be arranged in parallel between adjacent support column, the matching size that size and the fixing unit of base plate bind round closes, and fixing unit hoop is connected with grounding disc lead-in wire.
During use, the present invention adopts without top cover cylinder mouse cage type structure form, adopts circular steel plate bottom grounding disc, works the downforce effect of bearing cement pole, wire; Make 1, unit's hoop as cylinder mouse cage top with band steel, this yuan of hoop is evenly equipped with four and presses closer bolt; With several bar shaped band steels, binding round vertical welding with bottom circular steel plate and top unit respectively makes grizzly bar shape squirrel-cage periphery with dividing equally, play earth electrode effect, different soil is adjusted by increase and decrease grizzly bar shape squirrel-cage cylinder strip quantity or cylinder height.Should " grounding disc " be connected with cement electric pole Integral grounding terminal by band steel, composition earthing device, the function of chassis, earth electrode unites two into one by this version.Substitute cement electric pole anti-settling cement round bottom dish and anti-lightning strike ground pipe respectively, effectively improve the lightning protection level of overhead transmission line and cement electric pole vertical rod efficiency and construction quality.
Accompanying drawing explanation
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the vertical view of Fig. 1.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described.
The label of each accompanying drawing is expressed as follows: 1 chassis, 2 fixing unit hoops, 3 press closer bolt, 4 support columns, 5 grounding disc lead-in wires.
A kind of grounding disc device for cement electric pole of the present invention, its difference with the prior art is: described grounding disc device is by base plate, the support column be located on base plate, and the fixing unit to be connected with support column top binds round and forms, support column is arranged at the surrounding of base plate, be arranged in parallel between adjacent support column, the matching size that size and the fixing unit of base plate bind round closes, and fixing unit hoop is connected with grounding disc lead-in wire.
Adopt without top cover cylinder mouse cage type structure form, base plate adopts circular steel plate, works the downforce effect of bearing cement pole, wire; Make 1, fixing unit hoop as cylinder mouse cage top with band steel, this fixing unit hoop is evenly equipped with four and presses closer bolt; With several bar shaped band steel support columns, binding round vertical welding with bottom circular steel plate and top unit respectively makes grizzly bar shape squirrel-cage periphery with dividing equally, play earth electrode effect, should " grounding disc " be connected with cement electric pole Integral grounding terminal by band steel, composition earthing device.The function of chassis, earth electrode unites two into one by this version, therefore is named " grounding disc ".
Base plate is made up of metal material, and the surrounding of base plate is uniform, and by 3-30 root support column, support column is made up of band steel, and support column forms longitudinal fence between base plate and fixing unit hoop.Spacing between support column is by garden week decile, and numerical value does not assign to 30 deciles not etc. from third-class; The altitude range of support column is 200mm to 2000mm, and the diameter of support column is directly proportional to its cross section, and usual sectional area scope is 10 square millimeters to 500 square millimeters, and adopted is rectangle band steel here, its concrete specification 4*25mm
2.
Base plate is made up of metal material, and the surrounding of base plate is uniform, and by 4-8 root support column, support column is made up of band steel, and support column forms longitudinal fence between base plate and fixing unit hoop, and support column is vertical connection between bind round with base plate and fixing unit.The advantage of employing flat bar stock is inexpensive and mechanical strength is high, less support column can be adopted to reach stronger resistance to compression and load performance, the concrete specification 4*25mm of adopted rectangle band steel here
2.
Fixing unit hoop is made up of metal material, fixing unit hoop is evenly equipped with 3-6 and presses closer bolt.Fixing unit hoop is made up of band steel, fixing unit hoop is evenly equipped with 4 and presses closer bolt.The concrete specification 4*25mm of rectangle band steel adopted here
2, support column and base plate and fixing unit pass through between bind round to weld or bolt is fixedly connected with.Base plate is made up of circular steel plate, and the thickness of base plate is 4-6mm, connects chassis lead-in wire and is made up of band steel.The diameter of base plate is more than or equal to the diameter of fixing unit hoop.
Embodiment 1
The diameter 2-20mm larger than cement pole base diameter of base plate, base plate thickness can meet requirement of strength, is greater than the quality of cement pole, wire, and under grounding disc device, soil can meet downforce requirement; Make 1, fixing unit hoop as the top connecing base apparatus with band steel, this fixing unit hoop is evenly equipped with 4 and presses closer bolt; With several bar shaped band steels, binding round vertical welding with bottom circular steel plate and top unit respectively makes grizzly bar shape squirrel-cage periphery with dividing equally, and plays earth electrode effect; Should " grounding disc " be connected with cement electric pole Integral grounding terminal as grounding disc lead-in wire by band steel (or other metal material), composition earthing device, the function of chassis, earth electrode unites two into one by this version.Substitute cement electric pole anti-settling cement round bottom dish and anti-lightning strike ground pipe respectively, effectively improve the lightning protection level of overhead transmission line and cement electric pole vertical rod efficiency and construction quality.
Grounding disc structure is simple, constructability is installed, as long as depart from behind ground in cement pole lifting, from pole-footing portion by for grounding disc cover and press closer bolt and position by upper uniform four of grounding disc unit hoop and fix, before cement electric pole vertical rod, the installment work of grounding disc both can be completed.
After the success of grounding disc device experiment, as a new technology, in all new vertical rod engineerings, there is great application value.
After adopting patent grounding disc device of the present invention, not only reduce the damage of road pavement, damages will significantly reduce.Under same landform, geological conditions, the grounding resistance of grounding disc is lower than ground pipe, can reduce lightning current counterattack voltage, improves the lightning withstand level of circuit, reduces power outage.And the construction operation intensity of workman can be alleviated significantly, 18 pounds of iron hammers are thrown into electric power museum.
Embodiment 2
4mm steel plate is adopted to make the circular bottom plate one piece of diameter 440mm, making diameter with 4*25mm band steel is one piece, 440mm fixing unit hoop, the support column 6 that clear height is 400mm is made with 4*25mm band steel, support column is distributed on the surrounding of base plate and is fixedly connected by welding, the other end of support column to be bound round with fixing unit by welding and is connected, forming a height is 400mm, diameter is the grounding disc device of 440mm, grounding disc surface does not need zinc-plated, separately get a long 4500mm, specification is that 4*16mm band steel goes between as grounding disc, this grounding disc lead-in wire binds round with fixing unit and is connected, the other end welding one of grounding disc lead-in wire is of a size of 4*40*100mm band steel, here grounding disc lead-in wire is used to guide thunder and lightning, the hole that diameter is 17.5mm is opened on top, to fix unit's hoop adopts full tooth M16*40 bolt or GJ-35 steel strand wire to be connected with cement pole Integral grounding terminal, composition earthing device.Grounding disc device quality after making is 10.3kg, substantially suitable with the ground pipe quality (11.6kg) used at present, on cement pole, bar, device and wire quality are 18.5KN, be less than soil permitted bearing capacity 18.6KN under grounding disc device, therefore the grounding disc device that diameter of the present invention is 440mm can meet downforce requirement.After tested, the earth resistance that grounding disc device of the present invention calculates is 7.6 Ω, is less than 10 Ω, can meet the designing requirement of cement pole to earth resistance.
Then be that the grounding disc device of 440mm selects 5 representative shaft positions to test by diameter mentioned above, five bar positions be in farmland, in greenbelt respectively, tractor road roadside, on town road limit and pavement.Near the cement pole of installation test grounding disc device, select the cement pole installing traditional ground pipe to carry out test and compare, and the earth resistance of 2 earth electrodes is measured respectively, make grounding resistance have comparativity.Grounding resistance measurement work should divide to be carried out for 2 times, and first time was on vertical rod same day.Second time, after one week, is carried out after backfill soil sedimentation fully contacts with earth electrode.
Draw after test, beneficial effect of the present invention is as follows:
1, eliminate work cement round bottom dish being set, striking ground pipe, decrease artificial, accelerate construction schedule;
2, a grounding disc device is often installed and reduces earth excavation amount 0.3m
3, 500kg earth altogether;
3, eliminate the round bottom dish that weight is 70kg, decrease the transport of 100kg earth, improve efficiency of construction, reduce cost;
4, the damage of road pavement and damages decrease more than 50%;
5, under same landform, geological conditions, line lightning resisting level and power supply safety reliability can be improved;
6, under the prerequisite of the dark 2.3m of identical pits, cement pole resistance to capsizing is made to improve more than 14%.
There is effect measuring and calculating, after every root cement pole adopts grounding disc device, than the original mode adopting round bottom dish and ground pipe, direct cost about 120 yuan can be reduced, Shanghai needs the new vertical cement pole about 37500 installing earthing device every year, if all adopt grounding disc device, direct expense of project can be saved the whole year with 4,500,000 yuan.
The more important thing is, have employed grounding disc device, not only make damages significantly reduce, and the lightning withstand level of circuit can be improved, reduce power outage.The construction operation intensity of workman can be alleviated significantly simultaneously, substantially reduce time needed for engineering and artificial.
Embodiment 3
Grounding disc production program
1) Φ 440 round bottom 1 piece, dish (cylinder bottom) is made with thick 4mm steel plate.
2) make Φ 440 yuan with 4 × 25 band steels and bind round 1 piece (cylinder top).
3) clear height 400 (not containing flanging 50) band steel 6 pieces (cylindrical sides) is made with 4 × 25 band steels.
4) welded with outside round bottom dish by band steel tuck portion by 6 deciles (60 °), the band steel other end binds round lateral overlap electric welding with unit, forms the grounding disc (not needing zinc-plated) of 1 high by 400, interior diameter 440.
5) adopt long 4500,4 × 16 band steels to go between as grounding disc, overlap (lap of splice 40) with end member hoop inside parallel electric welding on grounding disc, convenient lead-in wire by grounding disc is enclosed in cylinder.The grounding disc lead-in wire other end is welded with 4 × 40 × 100 band steels (lap of splice 30), band steel top 30 place's perforate Φ 17.5.
6) 4 × 16 band steels and grounding disc junction 1000 not zinc-plated, all the other 3500 and overlap joint 4 × 40 band steels need galvanizing by dipping.
7) be connected with cement pole Integral grounding terminal (nut height distance ground 2m) with full tooth M16 × 40 bolt, composition earthing device.The above grounding disc lead-in wire in ground is close to cement pole stainless steel band and is fixed, and unnecessary grounding disc lead-in wire (about 500) is placed in below ground.
8) when grounding disc is enclosed within cement pole root and fixes (cement pole lifting depart from ground after), when cement pole has stood (backfill soil complete after).
Theory calculate:
1. grounding disc materials, Mass Calculation
1) 4 × 25 band steels: materials length 6 × 450+3.14 × 440=4080mm, quality (0.4 × 2.5 × 408 × 7.8)/1000=3.2kg.
2) 4 × 16 band steels: materials length 4500mm.Quality (0..4 × 1.6 × 450 × 7.8)/1000=2.3kg.
3) 4 × 40 band steels: materials 100mm, quality (0..4 × 4 × 10 × 7.8)/1000=0.1kg.
4) 4mm steel plate, materials Φ 440mm, quality (3.14/4 × 44 × 44 × 0.4 × 7.8)/1000=4.7kg.
5) quality 3.2+2.3+0.1+4.7=10.3kg is added up to, substantially suitable with the Φ 38*2700 ground pipe quality 11.6kg used at present (selecting from south, Shanghai City power supply administration equipment catalogue).
2. downforce calculates
1) because the soil under cement pole chassis bears the effect of downforce for a long time, easily cause sinking, so the soil permitted bearing capacity under cement pole chassis must be checked, sink to prevent cement pole.2) account form
F＝πD2R/4
R＝[R]+mhγ0(h-1.5)
π----circumference ratio
γ 0----soil calculates unit weight t/m3
D----bearing chassis overall diameter m
Soil permitted bearing capacity kN/m2 after R----revises
[R]----soil permitted bearing capacity kN/m2
Mh----capacity correct coefficient gets 2.0
H----concrete pole buried depth m
3) grounding disc is checked whether can to meet the requirement of cement pole downforce
Known M level Φ 190 × 15m cement pole quality 1603kg, on bar, device and wire quality are in 250kg, Soils of Shanghai Region permitted bearing capacity [R]=100kN/m2, and soil calculates unit weight γ 0=1.6t/m3, diameter D=0.44m at the bottom of grounding disc, concrete pole buried depth h=2.2m.
Computational process:
R＝[R]+mhγ0(h-1.5)＝100+2×16×(2.2-1.5)＝122.4kN/m2
F＝πD2R/4＝3.14×0.442×122.4/4＝18.6kN
On ∵ cement pole, bar, device and wire quality are 18.53kN, are less than permitted bearing capacity 18.6kN,
Under ∴ Φ 440 grounding disc, soil can meet downforce requirement.
3. earth resistance calculates
1) for convenience of calculating, not counting the form factor (earth resistance increase) of grounding disc, not counting the earth resistance effect (earth resistance reduction) of Φ 440 round bottom dish and 4 × 16 band steels lead-in wire.
2) if actual measurement earth resistance does not reach 10 Ω, by increasing by 4 × 25 band steel quantity, adjustment band steel specification, or increase the schemes such as cylinder height and solved.
3) account form
Rp＝ρ/(2πL)×ln(L2/(dh))
d＝b/2
π----circumference ratio
ρ---soil resistivity Ω .m
Rp---band steel earth resistance Ω
L----horizontal grounding band steel length m
H---grounding flat steel buried depth m
D----grounding flat steel molded breadth m
B----grounding flat steel width m
4) earth resistance of grounding disc is checked whether can to meet the demands
Soil resistivity ρ=30 Ω the .m of known bar position, grounding flat steel width b=0.025m, band steel buried depth h=2m, band steel length L=4.1m, is the earth resistance of grounding disc how many?
Computational process:
d＝b/2＝0.025/2＝0.0125m
Rp＝ρ/(2πL)×ln(L2/(dh))＝30/(2×3.14×4.1)×ln(4.12/(0.0125×2))＝7.6Ω
The earth resistance of ∵ grounding disc is 7.6 Ω,
∴ can meet the requirement that universal design grounding of pole resistance is less than 10 Ω.
Field test:
1. this 5, common processing experiment sample, single-piece quality (after processing adjustment) 10.5kg.
2. the bar position of the different terrain conditions that selection 5 is representative is tested, and is in farmland, in greenbelt, on tractor-ploughing curb, on municipal curb, on pavement respectively.
3. test must be carried out in conjunction with the engineering of having set up the project, and does not produce cement pole fee of material, traffic expense, vertical rod installation fee, and any damages.
4. the cement pole of installation test grounding disc, should install ground pipe simultaneously.And the earth resistance of 2 earth electrodes is measured respectively, make grounding resistance have comparativity.
5. grounding resistance measurement work should divide and carries out for 2 times, and first time was on vertical rod same day.Second time, after one week, is carried out after backfill soil settlement fully contacts with earth electrode.
6. after experiment work completes, the ground lead of grounding disc, ground pipe is in parallel, be connected with down conductor on bar, accomplish to make the best use of everything.
7. test cement pole grounding resistance to see the following form
Effect analysis:
1. reduce construction work amount
1) eliminate the work of cement round bottom dish is set.
2) with eliminating struck joint pipe work.
3) earth excavation amount 0.3m3 (about 500kg) is reduced.
4) quantities can saving 4 man-hours is estimated.
2. reduce Transportation Engineering amount
1) cement round bottom dish (70kg) transport is eliminated.
2) remaining soil cleaning, transport about 100kg is reduced.
3. reduce damages
1) grounding disc reduces 50% than cement round bottom area of trying to get to the heart of a matter, and no longer excavates ground pipe lead-in wire (band steel) passage, and damage and the reparation of road pavement can reduce more than 70%.
2) earth decreasing about 500kg is stacked, backfilling working, to cheating the indemnity for damage of the objects such as periphery lawn, hole by minimizing more than 50%.
4. improve the lightning withstand level of circuit
1) under same landform, geological conditions, the grounding resistance of grounding disc is lower than ground pipe, can reduce lightning current counterattack voltage, improves the lightning withstand level of circuit.
5. improve line security
1) under the prerequisite of the dark 2.3m of identical pits, when adopting cement round bottom dish (being highly 0.1m), concrete pole buried depth 2.2m.When adopting grounding disc, concrete pole buried depth 2.3m.
The resistance to capsizing of direct-burried cement pole is directly proportional to 3 powers of concrete pole buried depth, and therefore buried depth 2.3m is than the cement pole of buried depth 2.2m, and resistance to capsizing improves more than 14%.
2) Φ 190 × 15m cement pole, base diameter is Φ 390.When adopting cement round bottom dish, the hole, hole that need excavate, minimum diameter is Φ 600, larger than cement pole base diameter 210.When adopting grounding disc, the hole, hole that need excavate, minimum diameter is Φ 440, larger than cement pole base diameter 50.
In vertical rod, payingoff construction process, cheat the little cement pole in hole and be less likely to occur, the cement pole much bigger (hole, hole that especially earth is soft) that its fail safe is larger than hole, hole.
6. other
1) construction does not affect by orographic condition, and every root cement pole can install grounding disc, plays the effect of installation chassis, earthing device, standard of guaranteeing that line construction reaches " universal design ".
2) grounding disc height only 400 (apart from ground 1800 and following), can not affect strut rail (apart from ground about 700 ~ 1000) and install, meet the requirement that " universal design " installs strut rail.
3) unnecessary grounding disc lead-in wire, can not stay on pavement, makes the design of grounding, installs and reach built environment friendly line standard.
Claims (8)
1. the grounding disc device for cement electric pole, it is characterized in that: described grounding disc device is by base plate, the support column be located on base plate, and the fixing unit to be connected with support column top binds round and forms, support column is arranged at the surrounding of base plate, be arranged in parallel between adjacent support column, the matching size that size and the fixing unit of base plate bind round closes, and fixing unit hoop is connected with grounding disc lead-in wire.
2. a kind of grounding disc device for cement electric pole according to claim 1, it is characterized in that: base plate is made up of metal material, the surrounding of base plate is uniform, and by 3-30 root support column, support column is made up of band steel, and support column forms longitudinal fence between base plate and fixing unit hoop.
3. a kind of grounding disc device for cement electric pole according to claim 1, it is characterized in that: base plate is made up of metal material, the surrounding of base plate is uniform by 4-8 root support column, support column is made up of band steel, support column forms longitudinal fence between base plate and fixing unit hoop, and support column is connected for vertical between binding round with base plate and fixing unit.
4. a kind of grounding disc device for cement electric pole according to claim 1, is characterized in that: fixing unit hoop is made up of metal material, fixing unit hoop is evenly equipped with 3-6 and presses closer bolt.
5. a kind of grounding disc device for cement electric pole according to claim 1, is characterized in that: fixing unit hoop is made up of band steel, fixing unit hoop is evenly equipped with 4 and presses closer bolt.
6. a kind of grounding disc device for cement electric pole according to claim 1, is characterized in that: support column and base plate and fixing unit pass through between bind round to weld or bolt is fixedly connected with.
7. a kind of grounding disc device for cement electric pole according to claim 1, it is characterized in that: base plate is made up of circular steel plate, the thickness of base plate is 4-6mm, connects chassis lead-in wire and is made up of band steel.
8. a kind of grounding disc device for cement electric pole according to claim 1, is characterized in that: the diameter of base plate is more than or equal to the diameter of fixing unit hoop.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502651.0A CN105514627A (en) | 2014-09-26 | 2014-09-26 | Grounding disc device used for concrete telegraph pole |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410502651.0A CN105514627A (en) | 2014-09-26 | 2014-09-26 | Grounding disc device used for concrete telegraph pole |
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| CN105514627A true CN105514627A (en) | 2016-04-20 |
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| CN201410502651.0A Pending CN105514627A (en) | 2014-09-26 | 2014-09-26 | Grounding disc device used for concrete telegraph pole |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018696A (en) * | 2020-08-26 | 2020-12-01 | 国网上海市电力公司 | 10kV insulated conductor line trip protection method |
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2014
- 2014-09-26 CN CN201410502651.0A patent/CN105514627A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112018696A (en) * | 2020-08-26 | 2020-12-01 | 国网上海市电力公司 | 10kV insulated conductor line trip protection method |
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