CN106099757A - A kind of transmission line insulator crosses over crane span structure and construction technology thereof - Google Patents
A kind of transmission line insulator crosses over crane span structure and construction technology thereof Download PDFInfo
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- CN106099757A CN106099757A CN201610679309.7A CN201610679309A CN106099757A CN 106099757 A CN106099757 A CN 106099757A CN 201610679309 A CN201610679309 A CN 201610679309A CN 106099757 A CN106099757 A CN 106099757A
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- rope
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- block device
- coaster
- carrying rope
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/02—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables
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Abstract
One transmission line insulator of the present invention crosses over crane span structure, belongs to electric stringing engineering field.Purpose is the safety improving and living across construction.Including the first carrying rope, the second carrying rope, block device and bogey；One end of first carrying rope and the second carrying rope is anchored in ground through corresponding left side carrying coaster, and the other end is anchored in ground through corresponding right side carrying coaster；Block device is hung on the first carrying rope and the second carrying rope；Block device is anchored in ground by insulated left side messenger and side insulation right messenger；Block device is formed and carries, along the first carrying rope and second, the passage that rope bearing of trend is through.This one transmission line insulator crosses over crane span structure, not only at wire insulation barrier formed below, also forms insulation barrier in the both sides of wire, makes to form a headroom guard space to being spanned thing during unfolding conductor, improve the safety living across construction.Its construction technology, reduces construction process, saves cost of human resources and time cost.
Description
Technical field
The invention belongs to power circuit Poling Construction technical field, particularly a kind of transmission line insulator cross over crane span structure and
Its construction technology.
Background technology
Along with the fast development of electrical network building, cross over the transmission line of electricity lineman of built power circuit, railway, highway
Journey gets more and more.And traditional crossing construction sets up crossing frame frequently with Phyllostachys pubescens Mazei ex H.de Lebaie, but, utilize Phyllostachys pubescens Mazei ex H.de Lebaie to set up crossing frame and execute
Work needs good geographical conditions, and be spanned the excessive height of thing or span excessive time, crossing frame set up difficulty, expense
Height and safety are the highest.
The device that lives across occurred in recent years overcomes the defect of tradition crossing frame, it is achieved that live across the letter of device
List and lighting.Such as Application No. 201420014839.6, entitled a kind of ditch network plane formula lives across the China of device specially
Profit application, it is provided that one lives across device, it is achieved that overall process is the most iceound, the transmission line of electricity stringing that do not has a power failure, do not close a road to traffic
Construction, improves the efficiency living across construction.But, the block device of this patent application publication is plane formula, when at block
When setting up wire above device, wire cannot be constituted spacing by both sides, does not also form insulation barrier in wire both sides, if cable is sliding
Go out block device both sides, just cannot realize the purpose that insulate.
Summary of the invention
The technical problem to be solved is to provide a kind of transmission line insulator and crosses over crane span structure, is living across erection
During wire, form a headroom protective barrier to being spanned thing, to improve the safety living across construction.
The technical solution used in the present invention is: a kind of transmission line insulator crosses over crane span structure, including the first carrying rope, second holds
Carry rope, block device and be respectively arranged in the bogey crossing over shelves both sides；Left side bogey hangs and holds on the left of in the of one group
Carry coaster, right side bogey hangs carrying coaster on the right side of in the of a group；Described first carrying rope and one end of the second carrying rope
Being anchored in ground through corresponding left side carrying coaster, the other end is anchored in ground through corresponding right side carrying coaster；Described
Block device one end hangs on the first carrying rope, and the other end hangs on the second carrying rope；It is provided with in the left side of described block device
Insulated left side messenger, described insulated left side messenger one end is fixed on block device, and the other end is anchored in ground；At block device
Right side is provided with side insulation right messenger；Block device is fixed in described side insulation right messenger one end, and the other end is anchored in ground；Described
Block device is formed along the first carrying rope and the second carrying rope by the depression that faces down of the first carrying rope and the second carrying rope place
The passage that bearing of trend is through.
Further, described block device includes organizing unit suspension bridge more；Often group unit suspension bridge includes a bridge bar；Described
One end of bridge bar is provided with the first lifting rope, and the other end at described bridge bar is provided with the second lifting rope；Described first lifting rope one end is connected to
Bridge bar, the other end is provided with first and holds net coaster, first hold net coaster and first carrying rope be slidably connected；Described second lifting rope is even
Being connected to bridge bar, the other end is provided with second and holds net coaster, second hold net coaster and second carrying rope be slidably connected；Adjacent first hangs
Connection rope it is respectively connected with between rope, between adjacent second lifting rope.
Further, the connection rope equivalent between described insulated left side messenger, side insulation right messenger and adjacent cells suspension bridge, and
Insulated left side messenger is in same position with the junction point of block device left end with being connected the rope junction point with high order end unit suspension bridge
Put；Side insulation right messenger is in same with the junction point of block device right-hand member with being connected the junction point with low order end unit suspension bridge of restricting
Position.
Further, described bogey be installed on cross over shelves both sides steel tower on temporary cross arm or be installed on across
The more crossing frame of shelves both sides.
A kind of transmission line insulator crosses over the construction technology of crane span structure, comprises the following steps:
1) set up bogey, and on bogey, on the left of installation, carry coaster and right side carrying coaster；
2) unfolding carrying pull rope and cable bridge pull rope；
3) the first carrying is installed restrict and the second carrying rope:
First, by carrying pull rope traction the first carrying rope with the second carrying rope to specifying anchor point, anchoring traction end；
Then, the first carrying rope and the sag of the second carrying rope are adjusted；Finally, anchoring the first carrying rope and the tension force of the second carrying rope
End；
4) block device is installed:
First, link together organizing unit suspension bridge by connecting rope more；Then, block device is lifted into the first carrying
Below rope and the second carrying rope, holding net coaster by first and be installed to the first carrying rope, second holds net coaster is installed to the second carrying
Rope；And the two ends of block device are fixed temporarily；Then, put in place along the first carrying rope and the second carrying wire saws block device；
Finally, the two ends of block device are fixed.
Further, in step 4) in, the concrete operations that traction block device puts in place are: first, unclamp traction end place
The interim of side is fixed, and along the first carrying rope and the second carrying wire saws block device, by traction end to positioning end, described unit hangs
Bridge starts mobile in order；When there remains least one set unit suspension bridge start mobile before, install at last group unit suspension bridge
Check band, and unclamp the interim fixing of positioning end, continue traction suspension bridge.
Further, described check band includes four side insulation right messengers or insulated left side messenger and one end and four right sides
The cable bridge pull rope that insulation messenger insulated left side messenger connects.
The invention has the beneficial effects as follows: this one transmission line insulator crosses over crane span structure, owing to block device is by the first carrying
The depression that faces down at rope and the second carrying rope place is formed along the first carrying rope and the second carrying rope through passage of bearing of trend,
During along passage erection wire, wire is positioned at passage, and passage surrounds wire, not only at wire insulation barrier formed below, also exists
The both sides of wire form insulation barrier, form a headroom guard space to being spanned thing, improve charged when making unfolding conductor
The safety of crossing construction.Further, block device upper end is hung on the first carrying rope and the second carrying rope；Left side is passed through at two ends, left and right
Insulation messenger and side insulation right messenger are anchored in ground, thus are fixed by block device, under wind-force effect, and the pendulum of block device
Dynamic amplitude reduction, improves the inclined ability of wind resistance of block device；And this one transmission line insulator leap crane span structure construction technology, subtract
Few construction process, saves cost of human resources and time cost, advantageously ensures that construction speed.
Accompanying drawing explanation
Fig. 1 is the front view of the first embodiment；
Fig. 2 is the top view of Fig. 1；
Fig. 3 is block device schematic diagram.
In figure, the first carrying rope 1, second carries rope 2, block device 3, unit suspension bridge 31, bridge bar the 311, first lifting rope
312, the second lifting rope 313, first hold net coaster 314, second hold net coaster 315, connect rope 316, insulated left side messenger 317, right
Side insulation messenger 318, left side carrying coaster 4, right side carrying coaster 5, bogey 6.
Detailed description of the invention
That the present invention is described further is as follows with embodiment below in conjunction with the accompanying drawings:
In this specification, the left end in represented orientation and right-hand member are all as the criterion shown in accompanying drawing 1.
A kind of transmission line insulator crosses over crane span structure, as shown in Figure 1-Figure 3, carries rope 2, envelope including the first carrying rope 1, second
Net device 3 crosses over the bogey 6 of shelves both sides with being respectively arranged in；Left side bogey 6 hangs carrying on the left of in the of a group sliding
Car 4, hangs carrying coaster 5 on the right side of in the of a group on right side bogey 6；Described first carrying rope 1 and one end of the second carrying rope 2
Being anchored in ground through corresponding left side carrying coaster 4, the other end is anchored in ground through corresponding right side carrying coaster 5；Institute
Stating block device 3 one end and hang on the first carrying rope 1, the other end hangs on the second carrying rope 2；A left side at described block device 3
Side is provided with insulated left side messenger 317, and block device 3 is fixed in described insulated left side messenger 317 one end, and the other end is anchored in ground
Face；It is provided with side insulation right messenger 318 on the right side of block device 3；Block device is fixed in described side insulation right messenger 318 one end
3, the other end is anchored in ground；Described block device 3 is by the first carrying rope 1 and concave shape that faces down at the second carrying rope 2 places
Become and carry, along the first carrying rope 1 and second, the passage that rope 2 bearing of trends are through.
This one transmission line insulator crosses over crane span structure, owing to block device 3 is carried rope 2 institutes by the first carrying rope 1 and second
The depression that faces down formed along the first carrying rope 1 and the second carrying rope through passage of 2 bearing of trends, set up wire along passage
Time, wire is positioned at passage, and passage surrounds wire, not only at wire insulation barrier formed below, is also formed in the both sides of wire
Insulation barrier, forms a headroom guard space to being spanned thing when making unfolding conductor, improves the safety living across construction
Property.Further, block device 3 upper end is hung on the first carrying rope 1 and the second carrying rope 2；Insulated left side messenger 317 is passed through at two ends, left and right
It is anchored in ground with side insulation right messenger 318, thus block device 3 is fixed, under wind-force effect, the swing of block device 3
Amplitude reduction, improves the inclined ability of wind resistance of block device 3.
Preferably, described block device 3 includes organizing unit suspension bridge 31 more；Often group unit suspension bridge 31 includes a bridge bar 311；
Being provided with the first lifting rope 312 in one end of described bridge bar 311, the other end at described bridge bar 311 is provided with the second lifting rope 313；Described
First lifting rope 312 one end is connected to bridge bar 311, and the other end is provided with first and holds net coaster 314, and first holds net coaster 314 and
One carrying rope 1 is slidably connected；Described second lifting rope 313 is connected to bridge bar 311, and the other end is provided with second and holds net coaster 315, the
Two hold net coaster 315 is slidably connected with the second carrying rope 2；Between adjacent first lifting rope 312, it is all connected with between adjacent second lifting rope 313
There is connection rope 316.
Block device 3 includes organizing unit suspension bridge 31 more, by connecting rope 316 connection between unit suspension bridge 31, then, when wherein
After a certain group of unit suspension bridge 31 damages, the unit suspension bridge 31 of replaceable damage, it is not necessary to scrap whole block device 3.Moreover, pass through
The number of increase and decrease unit suspension bridge 31 just can change the entire length of block device 3, is more convenient for adjusting the length of block device 3, suitable
Answering property is more preferable.Further, each unit suspension bridge 31 includes a bridge bar 311, is provided with the first lifting rope in one end of described bridge bar 311
312, the other end at described bridge bar 311 is provided with the second lifting rope 313；When the first lifting rope 312 holds net coaster 314 even by first
Being connected to the first carrying rope 1, the second lifting rope 313 holds after net coaster 315 is connected to the second carrying rope 2 by second, and all unit hang
The bridge bar 311 of bridge 31 forms the traveling road surface of wire traction, and wire moves ahead on this traveling road surface, and on latticed wire side
Moving ahead and compare, frictional force is less, reduces the abrasion risk of wire, and meanwhile, the wearability of bridge bar 311 is better than rope, extends again
The wear time of block device 3.Further, the similar flexible string bag of block device 3, its impact resistance improves.
For the ease of traction block device 3, unit suspension bridge 31 speed of service everywhere is made to keep consistent, it is to avoid unit suspension bridge
31 one end are front, and the other end, rear, causes same unit suspension bridge 31 that first carrying rope 1 and second is carried the active force of rope 2 not
Equal.Preferably, the connection rope 316 between described insulated left side messenger 317, side insulation right messenger 318 and adjacent cells suspension bridge 31
Equivalent, and the junction point of insulated left side messenger 317 and block device 3 left end be connected rope 316 and high order end unit suspension bridge 31
Junction point is in same position；The junction point of side insulation right messenger 318 and block device 3 right-hand member be connected rope 316 and low order end
The junction point of unit suspension bridge 31 is in same position.
Preferably, described bogey 6 be installed on cross over shelves both sides steel tower on temporary cross arm or be installed on across
The more crossing frame of shelves both sides.
A kind of transmission line insulator crosses over the construction technology of crane span structure, comprises the following steps:
1 sets up bogey 6, and carries coaster 4 and right side carrying coaster 5 on bogey 6 on the left of installation；
2 unfolding carrying pull rope and cable bridge pull ropes；
3 installation the first carrying rope 1 and the second carrying ropes 2:
First, rope 1 and the second carrying rope 2 are carried to appointment anchor point, anchoring traction by carrying pull rope traction first
End；Then, the first carrying rope 1 and sag of the second carrying rope 2 is adjusted；Finally, anchoring the first carrying rope 1 and the second carrying rope 2
Tension force end；
4 installation block devices 3:
First, link together organizing unit suspension bridge 31 by connecting rope 316 more；Then, block device 3 is lifted into
Below one carrying rope 1 and the second carrying rope 2, holding net coaster 314 by first and be installed to the first carrying rope 1, second holds net coaster 315
It is installed to the second carrying rope 2；And the two ends of block device 3 are fixed temporarily；Then, along the first carrying rope 1 and the second carrying rope 2
Traction block device 3 puts in place；Finally, the two ends of block device 3 are fixed.
This kind of transmission line insulator crosses over the construction technology of crane span structure, carries out installing block device by the mode of spreading conducting wire
The installation of 3, reduces construction process, saves cost of human resources and time cost, advantageously ensures that construction speed.
Preferably, in step 4, the concrete operations that traction block device 3 puts in place are: first, unclamp side, traction end place
Interim fixing, along the first carrying rope 1 and the second carrying rope 2 traction block devices 3, by traction end to positioning end, described unit
Suspension bridge 31 starts mobile in order；When there remains least one set unit suspension bridge 31 start mobile before, hang at last group unit
Check band installed by bridge 31, and unclamps the interim fixing of positioning end, continues traction suspension bridge.
First, unclamp the interim fixing of traction end, do not unclamp the interim fixing of positioning end, make the positioning end temporarily will not edge
Move along the first carrying rope 1 and the second carrying rope 2, be conducive to the adjacent cells suspension bridge 31 that quickly will be close to traction end to launch.But
Being that block device 3 to be drawn to be spanned the top of thing, all unit suspension bridges 31 are required to move, therefore, need to unclamp
The interim of positioning end is fixed.In order to enable along the first carrying rope 1 and position of the second carrying rope 2 adjustment block devices 3, therefore,
Check band installed by later group unit suspension bridge 31.This kind of traction method of putting in place of block device 3 can quickly, simple by block device
3 are drawn to suitable position.Described traction end is relative with positioning end, when the left end of block device 3 is traction end, and block
The right-hand member of device 3 is just positioning end；When the right-hand member of block device 3 is traction end, the left end of block device 3 is just positioning end.
Preferably, described check band include four side insulation right messengers 318 or insulated left side messenger 317 and one end with four
The cable bridge pull rope that side insulation right messenger 318 insulated left side messenger 317 connects.Certainly, check band can be the auxiliary of extra layout
Help rope, but, material saved by the side insulation right messenger 318 utilizing insulation to cross over crane span structure self, it is to avoid arrange extra auxiliary
The constructing operation of rope.
Embodiment 1: this one transmission line insulator crosses over crane span structure and construction technology is applied to another 110kV double-circuit line
One of them section of new construction, the existing 110kV power transmission line of this section leap, span is 414m, the discrepancy in elevation little, wire and quilt
Span line top clear distance 8.5m, a length of 18m of block, width is 16m.Take pole to be installed on existing steel tower as carrying dress
Put.This section crosses over 2.5 hours block used times, and direct saving power down takes 170,000 yuans.
Embodiment 2: this one transmission line insulator crosses over crane span structure and construction technology is applied to a certain 110kV double-circuit line
One of them section of new construction, this section Midspan sag, crossing over thing has the special supply lines of railway, and span is 636m, the discrepancy in elevation
Greatly, and span is big, and a length of 19m of block, width is 14m.Take outside contact net, to set up crossing frame as bogey.This section
Cross over 2 hours block used times, and direct saving railway measure expense 550,000 yuans.
Claims (7)
1. transmission line insulator cross over a crane span structure, including the first carrying rope (1), second carrying rope (2), block device (3) and
It is respectively arranged in the bogey (6) crossing over shelves both sides；Coaster (4) is carried on the left of the upper suspension of left side bogey (6) a group,
Coaster (5) is carried on the right side of the upper suspension of right side bogey (6) a group；(2) are restricted in described first carrying rope (1) and the second carrying
One end is anchored in ground through corresponding left side carrying coaster (4), and the other end is anchored in through corresponding right side carrying coaster (5)
Ground；It is characterized in that: described block device (3) one end hangs on the first carrying rope (1), and the other end hangs on the second carrying rope
(2)；Be provided with insulated left side messenger (317) in the left side of described block device (3), described insulated left side messenger (317) one end is solid
Due to block device (3), the other end is anchored in ground；It is provided with side insulation right messenger (318) on the right side of block device (3)；Institute
Stating side insulation right messenger (318) one end and be fixed on block device (3), the other end is anchored in ground；Described block device (3) is by
The depression that faces down at one carrying rope (1) and second carrying rope (2) place is formed along the first carrying rope (1) and the second carrying rope (2)
The passage that bearing of trend is through.
2. a kind of transmission line insulator as claimed in claim 1 crosses over crane span structure, it is characterised in that: described block device (3) is wrapped
Include many groups unit suspension bridge (31)；Often group unit suspension bridge (31) includes a bridge bar (311)；Set in one end of described bridge bar (311)
Having the first lifting rope (312), the other end described bridge bar (311) is provided with the second lifting rope (313)；Described first lifting rope (312)
End is connected to bridge bar (311), and the other end is provided with first and holds net coaster (314), and first holds net coaster (314) and the first carrying rope
(1) it is slidably connected；Described second lifting rope (313) is connected to bridge bar (311), and the other end is provided with second and holds net coaster (315), the
Two hold net coaster (315) is slidably connected with the second carrying rope (2)；Between adjacent first lifting rope (312), adjacent second lifting rope (313)
Between be respectively connected with connection rope (316).
3. a kind of transmission line insulator as claimed in claim 2 crosses over crane span structure, it is characterised in that: described insulated left side messenger
(317) connection rope (316) equivalent, between side insulation right messenger (318) and adjacent cells suspension bridge (31), and insulated left side messenger
(317) it is in same with the junction point of block device (3) left end with being connected the rope (316) junction point with high order end unit suspension bridge (31)
One position；Side insulation right messenger (318) hangs with low order end unit with being connected rope (316) with the junction point of block device (3) right-hand member
The junction point of bridge (31) is in same position.
4. a kind of transmission line insulator as described in claim 1-3 any one claim crosses over crane span structure, it is characterised in that:
Described bogey (6) is the temporary cross arm being installed on the steel tower crossing over shelves both sides or is installed on the leap crossing over shelves both sides
Frame.
A kind of transmission line insulator the most as claimed in claim 4 crosses over the construction technology of crane span structure, it is characterised in that: include following
Step:
1) set up bogey (6), and carry coaster (4) and right side carrying coaster (5) on the left of the upper installation of bogey (6)；
2) unfolding carrying pull rope and cable bridge pull rope；
3) the first carrying rope (1) is installed and (2) is restricted in the second carrying:
First, restricted (1) by carrying pull rope traction the first carrying and the second carrying rope (2) is to specifying anchor point, anchor traction
End；Then, the first carrying rope (1) and the sag of the second carrying rope (2) are adjusted；Finally, anchoring the first carrying rope (1) and second is held
Carry the tension force end of rope (2)；
4) block device (3) is installed:
First, unit suspension bridge (31) will be organized more and link together by connecting rope (316)；Then, block device (3) is lifted into
Below first carrying rope (1) and the second carrying rope (2), hold net coaster (314) by first and be installed to the first carrying rope (1), second
Hold net coaster (315) and be installed to the second carrying rope (2)；And the two ends of block device (3) are fixed temporarily；Then, hold along first
Carry rope (1) and the second carrying rope (2) traction block device (3) puts in place；Finally, the two ends of block device (3) are fixed.
A kind of transmission line insulator the most as claimed in claim 5 crosses over the construction technology of crane span structure, it is characterised in that: in step 4)
In, the concrete operations that traction block device (3) puts in place are: first, unclamp the interim fixing of side, traction end place, along the first carrying
Rope (1) and the second carrying rope (2) traction block device (3), by traction end to positioning end, described unit suspension bridge (31) is opened in order
Begin mobile；When there remains least one set unit suspension bridge (31) start mobile before, in last group unit suspension bridge (31), system is installed
Running rope, and unclamp the interim fixing of positioning end, continue traction suspension bridge.
A kind of transmission line insulator the most as claimed in claim 6 crosses over the construction technology of crane span structure, it is characterised in that: described braking
Rope includes that four side insulation right messengers (318) or insulated left side messenger (317) and one end are left with four side insulation right messengers (318)
The cable bridge pull rope that side insulation messenger (317) connects.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679309.7A CN106099757A (en) | 2016-08-17 | 2016-08-17 | A kind of transmission line insulator crosses over crane span structure and construction technology thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610679309.7A CN106099757A (en) | 2016-08-17 | 2016-08-17 | A kind of transmission line insulator crosses over crane span structure and construction technology thereof |
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| Publication Number | Publication Date |
|---|---|
| CN106099757A true CN106099757A (en) | 2016-11-09 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610679309.7A Pending CN106099757A (en) | 2016-08-17 | 2016-08-17 | A kind of transmission line insulator crosses over crane span structure and construction technology thereof |
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| CN107947017A (en) * | 2017-12-11 | 2018-04-20 | 国网甘肃省电力公司经济技术研究院 | ± 1100kV line constructions alive circuit crossing frame and its erection method |
| CN110401137A (en) * | 2019-08-13 | 2019-11-01 | 中国电建集团重庆工程有限公司 | Transmission line wire replacing options |
| CN110504641A (en) * | 2019-09-17 | 2019-11-26 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of insulation protection device of charged for replacement independence shelves aerial earth wire and guard method |
| CN113824046A (en) * | 2021-09-18 | 2021-12-21 | 广东电网有限责任公司广州供电局 | Automatic net sealing device |
| CN114678800A (en) * | 2022-03-30 | 2022-06-28 | 平煤神马建工集团有限公司 | Rope net supporting device for crossing erection of conducting wire |
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| CN110504641A (en) * | 2019-09-17 | 2019-11-26 | 国网辽宁省电力有限公司辽阳供电公司 | A kind of insulation protection device of charged for replacement independence shelves aerial earth wire and guard method |
| CN110504641B (en) * | 2019-09-17 | 2024-06-11 | 国网辽宁省电力有限公司辽阳供电公司 | Insulation protection device and protection method for live replacement of independent-gear overhead ground wire |
| CN113824046A (en) * | 2021-09-18 | 2021-12-21 | 广东电网有限责任公司广州供电局 | Automatic net sealing device |
| CN114678800A (en) * | 2022-03-30 | 2022-06-28 | 平煤神马建工集团有限公司 | Rope net supporting device for crossing erection of conducting wire |
| CN114678800B (en) * | 2022-03-30 | 2023-11-10 | 平煤神马建工集团有限公司 | Rope net supporting device for crossing and erecting wires |
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Application publication date: 20161109 |