CN112886474A - Wire pay-off device - Google Patents
Wire pay-off device Download PDFInfo
- Publication number
- CN112886474A CN112886474A CN202110377102.5A CN202110377102A CN112886474A CN 112886474 A CN112886474 A CN 112886474A CN 202110377102 A CN202110377102 A CN 202110377102A CN 112886474 A CN112886474 A CN 112886474A
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- China
- Prior art keywords
- hoisting
- cantilever beam
- pay
- insulating cantilever
- fixed
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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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
Abstract
A wire releasing device. The invention aims to solve the problem that in the prior art, when a main lead is seriously damaged, the line is forced to be powered off for maintenance, so that great economic loss is caused. Insulating cantilever beam upper end processing has U type groove, and 1 number lockpin and 1 number gyro wheel are arranged in U type inslot, and 1 number lockpin is installed at the upper end middle part of insulating cantilever beam, and 1 number gyro wheel is installed at the upper end middle part of insulating cantilever beam, and 1 number lockpin is installed in the top of 1 number gyro wheel, and 1 number lockpin and 1 number gyro wheel are parallel to each other and leave the clearance between the two, and insulating cantilever beam lower extreme and fixed pay-off pass through screw fixed connection. The front end of the No. 1 hoisting fixed pay-off device is provided with a No. 2 roller, the rear end of the No. 1 hoisting fixed pay-off device is provided with a No. 2 lock pin, and the No. 2 lock pin is positioned above the No. 2 roller and arranged in parallel with the No. 2 roller; one end of the No. 2 hoisting rod is fixedly connected with the other end of the insulating cantilever beam through another threaded lock catch. The present invention relates to the field of live-wire work.
Description
Technical Field
The invention relates to live-wire work, in particular to a wire pay-off device.
Background
The 10kV overhead line is exposed in nature for a long time, the operation environment is severe and complex, and the burning loss of the main conductor of the overhead line is caused by various factors such as external force damage, construction quality and contact overheating. Along with the degree of dependence of electric power customer to power equipment is higher and higher, and the requirement to the continuous uninterrupted power supply of circuit is just more strict, consequently when taking place the main traverse line damage condition, mostly stick to the operation of taking a disease, the seed of accident has been buried for the operation of circuit safety and stability to the existence of this hidden danger, and the circuit is compelled to have a power failure to overhaul when the main traverse line is impaired seriously. The main guide line of the line is replaced with a large workload, the power failure maintenance time is long, the serious economic loss is caused, the negative impact on the society and enterprises is immeasurable, and especially when the accident occurs to the double-circuit or multi-circuit parallel line, the impact and the loss are multiplied.
At present, the average load current of a 10kV distribution network line is 300A, the power factor is 0.9, and at least 8h is needed if a power failure operation mode is adopted for replacing a main conductor of the 10kV distribution network line.
The power loss caused by this is: p ═ UIcos Φ t ═ 1.732 × 10 × 300 × 0.9 × 8 ═ 37411.2 kWh.
The average price of electricity sold is at least 466.53 yuan/kwh.
The economic loss brought to power supply enterprises by power failure treatment is at least: 37411.2kWh × 466.53 yuan/kWh 17453.45 yuan.
The social benefit of 1 degree electricity is at least 30 yuan, and the economic loss brought to the society by power failure treatment is at least: 37411.2kWh × 30 yuan/kWh 112.23 ten thousand yuan.
In conclusion, the prior art has the problem that when the main lead is seriously damaged, the line is forced to be powered off and repaired, so that great economic loss is caused.
Disclosure of Invention
The invention provides a wire pay-off device for overcoming the problem that in the prior art, when a main wire is seriously damaged, the wire is forced to be powered off for maintenance, so that great economic loss is caused.
The technical scheme of the invention is as follows:
a wire pay-off device comprises an insulating cantilever beam, a No. 1 lock pin, a No. 1 roller and a fixed pay-off device;
insulating cantilever beam upper end processing has U type groove, and 1 number lockpin and 1 number gyro wheel are arranged in U type inslot, and 1 number lockpin is installed at the upper end middle part of insulating cantilever beam, and 1 number gyro wheel is installed at the upper end middle part of insulating cantilever beam, and 1 number lockpin is installed in the top of 1 number gyro wheel, and 1 number lockpin and 1 number gyro wheel are parallel to each other and leave the clearance between the two, and insulating cantilever beam lower extreme and fixed pay-off pass through screw fixed connection.
A wire pay-off device comprises an insulating cantilever beam, a No. 2 lock pin, a No. 2 roller, a No. 1 hoisting device, a No. 3 lock pin, a No. 3 roller, a No. 2 hoisting device and a clamp;
the No. 1 hoisting comprises a No. 1 hoisting rod and a No. 1 hoisting fixed pay-off device;
the No. 1 hoisting rod is fixedly connected with the No. 1 hoisting fixing pay-off device, and the No. 1 hoisting rod and the No. 1 hoisting fixing pay-off device are integrated;
one end of the No. 1 hoisting rod is fixedly connected with one end of the insulating cantilever beam through a threaded lock catch, the No. 1 hoisting rod and the insulating cantilever beam are mutually and vertically connected, the No. 2 roller is installed at the front end of the No. 1 hoisting fixed pay-off device, the No. 2 lock pin is installed at the rear end of the No. 1 hoisting fixed pay-off device, the No. 2 lock pin is positioned above the No. 2 roller, and the No. 2 lock pin and the No. 2 roller are mutually arranged in;
the No. 2 hoisting comprises a No. 2 hoisting rod and a No. 2 hoisting fixed pay-off device;
one end of the No. 2 hoisting rod is fixedly connected with the other end of the insulating cantilever beam through another threaded lock catch, the No. 2 hoisting rod and the insulating cantilever beam are mutually and vertically connected, the No. 3 roller is installed at the front end of the No. 2 hoisting fixed pay-off device, the No. 3 lock pin is installed at the rear end of the No. 2 hoisting fixed pay-off device, the No. 3 lock pin is positioned above the No. 3 roller, and the two lock pins are mutually arranged in parallel;
and a clamp is arranged at one end part of the insulating cantilever beam.
Compared with the prior art, the invention has the following effects:
1. the invention changes the main conductor of the line on the premise of no power failure, and the No. 1 hoisting and the No. 2 hoisting which are designed on the insulating cantilever beam and have different lengths form larger air gaps among the new and old conductor replacement, the temporary short-circuit conductor, the rod body and other grounding bodies to the maximum extent while having enough insulation strength so as to meet the requirement of having enough solid and gas insulation. The problem is solved, the reliability of the power grid is greatly improved, the social image of the power enterprise is improved, the power utilization requirement of the society is greatly met, a new growth point of social economy is developed, and early-stage basic work is made for the development of economy in power supply areas.
2. The material of the wire pay-off device is high molecular polymer-epoxy resin, has excellent physical and mechanical properties and electrical insulation performance, can completely bear mechanical external force brought by the replacement of new and old wires in the transmission process, and can also bear the maximum internal operation overvoltage of a 10kV system.
3. Through experiments, the transmission parts on the lead placing positions of the two pay-off devices are very stable and flexible. The lockpin, the simple operation can prevent effectively that the wire atress from jumping out or breaking away from the pay off rack.
4. The invention leads the two pay-off devices and the rod body and the cross arm to be connected and fixed, thereby being stable, reliable, convenient and fast to operate and achieving the expected design purpose.
5. According to the hoisting design with different lengths of the pole body wire pay-off device, the new and old wires are well controlled in the replacement process through trial, and a certain distance can be ensured between the new and old wires and the temporary short-circuit wire.
Drawings
FIG. 1 is a front view of a wire payoff device on a cross arm of the present invention;
FIG. 2 is a side view of a wire payout device on a cross arm of the present invention;
fig. 3 is a front view of a shaft wire payoff device of the present invention.
Detailed Description
The first embodiment is as follows: the embodiment is described with reference to fig. 1 to 2, and the wire pay-off device of the embodiment comprises an insulating cantilever beam 1, a No. 1 lock pin 2, a No. 1 roller 3 and a fixed pay-off device 5;
1 upper end processing of insulating cantilever beam has U type groove 4, 1 number lockpin 2 and 1 number gyro wheel 3 are arranged in U type groove 4, 1 number lockpin 2 is installed in the upper end middle part of insulating cantilever beam 1, 1 number gyro wheel 3 is installed in the upper end middle part of insulating cantilever beam 1, 1 number lockpin 2 is installed in 1 number gyro wheel 3's top, 1 number lockpin 2 and 1 number gyro wheel 3 are parallel to each other and leave the clearance between the two, 1 lower extreme of insulating cantilever beam and fixed pay-off 5 pass through screw fixed connection.
And the new wire and the old wire are arranged on the gap between the No. 1 lock pin 2 and the No. 1 roller 3, so that the replacement of the new wire and the old wire is realized.
So set up 1 gyro wheel 3 and when interim short circuit wire releases, receive traction force transmission, for the damage of avoiding interim short circuit wire and reduce the resistance. No. 1 lockpin 2 is the safety consideration, prevents that new and old wire replacement in-process, atress from jumping out or breaking away from the pay off rack.
The second embodiment is as follows: referring to fig. 1 to 2, the present embodiment is described, in which a plurality of holes 6 are sequentially formed on the front side, the rear side, the left side and the right side of the insulating cantilever 1 of the present embodiment from top to bottom. The perforations 6 are of different sizes. This is done for aesthetic purposes and to minimize weight. The rest is the same as the first embodiment.
The third concrete implementation mode: the present embodiment is described with reference to fig. 1 to 2, and the number of the holes 6 of the present embodiment is 3, 4, 5, and 6. The perforations 6 are of different sizes. This is done for aesthetic purposes and to minimize weight. The others are the same as in the first or second embodiment.
The fourth concrete implementation mode: the embodiment is described with reference to fig. 1 to 2, and the fixed pay-off device 5 of the embodiment comprises a groove 5-1 and a puller bolt 5-2;
the horizontal section of the groove 5-1 is arranged on the lower end face of the insulating cantilever beam 1, and the angle iron of the cross arm is fixedly arranged in the groove 5-1 through a puller bolt 5-2. The height of the groove 5-1 is 2 cm.
The others are the same as the first, second or third embodiments.
The fifth concrete implementation mode: the present embodiment will be described with reference to fig. 1 to 2, and the number of the jack bolts 5-2 of the present embodiment is 1 or 2. The arrangement is that the angle iron of the cross arm is tightly propped when being placed in the groove.
The others are the same as the first, second, third or fourth embodiments.
The sixth specific implementation mode: the embodiment is described with reference to fig. 3, and the wire pay-off device of the embodiment includes an insulating cantilever beam 1, a No. 2 lock pin 8, a No. 2 roller 9, a No. 1 hoist 10, a No. 3 lock pin 11, a No. 3 roller 12, a No. 2 hoist 13 and a clamp 14;
the No. 1 hoisting device 10 comprises a No. 1 hoisting rod 10-1 and a No. 1 hoisting fixed pay-off device 10-2;
the No. 1 hoisting rod 10-1 is fixedly connected with the No. 1 hoisting fixing pay-off device 10-2, and the No. 1 hoisting rod 10-1 and the No. 1 hoisting fixing pay-off device 10-2 are an integrated piece;
one end of the No. 1 hoisting rod 10-1 is fixedly connected with one end of the insulated cantilever beam 1 through a threaded lock catch, the No. 1 hoisting rod 10 is vertically connected with the insulated cantilever beam 1, the No. 2 roller 9 is installed at the front end of the No. 1 hoisting fixed pay-off device 10-2, the No. 2 lock pin 8 is installed at the rear end of the No. 1 hoisting fixed pay-off device 10-2, the No. 2 lock pin 8 is positioned above the No. 2 roller 9, and the two are arranged in parallel;
the No. 2 hoisting device 13 comprises a No. 2 hoisting rod 13-1 and a No. 2 hoisting fixed pay-off device 13-2;
one end of the No. 2 hoisting rod 13-1 is fixedly connected with the other end of the insulated cantilever beam 1 through another threaded lock catch, the No. 2 hoisting rod 13 is vertically connected with the insulated cantilever beam 1, the No. 3 roller 12 is installed at the front end of the No. 2 hoisting fixed pay-off device 13-2, the No. 3 lock pin 11 is installed at the rear end of the No. 2 hoisting fixed pay-off device 13-2, the No. 3 lock pin 11 is positioned above the No. 3 roller 12, and the two are arranged in parallel;
a clamp 14 is arranged at one end of the insulating cantilever beam 1.
The new wire and the old wire are arranged between the No. 2 lock pin 8 and the No. 2 roller 9, and the bypass drainage wire is arranged between the No. 3 lock pin 11 and the No. 3 roller 12, so that the replacement of the new wire and the old wire is realized.
When setting up so that No. 2 gyro wheel 9 and No. 3 gyro wheel 12 release, replace the wire release, receive traction force transmission, for avoiding the damage of interim short circuit wire and reduce the resistance. No. 2 lockpin 8 and No. 3 lockpin 11 are for safety consideration, prevent that interim short circuit wire atress from jumping out or breaking away from the pay off rack. The threaded lock catch is arranged for facilitating distance adjustment according to the field situation, and the two hoists are arranged on the insulating cantilever beam.
The seventh embodiment: referring to fig. 3, the present embodiment is described, wherein a plurality of holes 6 are formed in the front side and the rear side of the insulating cantilever 1 of the present embodiment in order from top to bottom. The perforations 6 are of different sizes. This is done for aesthetic purposes and to minimize weight. The rest is the same as the sixth embodiment.
The specific implementation mode is eight: the present embodiment is described with reference to fig. 3, and the number of the holes 6 in the present embodiment is 6, 7, 8, or 9. The perforations 6 are of different sizes. This is done for aesthetic purposes and to minimize weight. The rest is the same as the sixth or seventh embodiment.
The specific implementation method nine: referring to fig. 3 for explaining the present embodiment, the chucking appliance 14 of the present embodiment includes a fixing jaw 14-1 and a fixing chain 14-2;
the fixed chain 14-2 is fixedly connected to one end of the fixed jaw 14-1, the fixed jaw 14-1 is fixed on the end surface of the utility pole, and the fixed chain 14-2 is wrapped on the utility pole. The arrangement is such that the fixing claws 14-1 and the fixing chains 14-2 are fixed to the utility pole to fix the wire releasing device. The others are the same as the embodiments six, seven or eight.
The detailed implementation mode is ten: referring to fig. 3, the present embodiment will be described, and hoisting nos. 1 and 2 and 13 of the present embodiment are both made of steel. The others are the same as the embodiments six, seven, eight or nine.
The concrete implementation mode eleven: referring to fig. 3, the fixing jaw 14-1 of the present embodiment has a length of 40cm and a width of 20 cm. The others are the same as the embodiments six, seven, eight, nine or ten.
The specific implementation mode twelve: referring to fig. 3, the diameter of each of the hoisting rod No. 1 10-1 and the hoisting rod No. 2 13-1 of the present embodiment is 3.5 cm. The others are the same as the embodiments six, seven, eight, nine, ten or eleven.
The specific implementation mode is thirteen: referring to fig. 3, the length of the insulated cantilever 1 of the present embodiment is 1m, and the insulated cantilever 1 is made of a 10cm × 10cm square tube of epoxy glass fiber reinforced plastic. The others are the same as the embodiments six, seven, eight, nine, ten, eleven or twelve.
The present invention has been described in terms of the preferred embodiments, but it is not limited thereto, and any simple modification, equivalent change and modification made to the above embodiments according to the technical spirit of the present invention will still fall within the technical scope of the present invention.
Claims (10)
1. A wire pay-off device is characterized in that: the device comprises an insulating cantilever beam (1), a No. 1 lock pin (2), a No. 1 roller (3) and a fixed pay-off device (5);
insulating cantilever beam (1) upper end processing has U type groove (4), 1 number lockpin (2) and 1 number gyro wheel (3) are arranged in U type groove (4), 1 number lockpin (2) are installed in the upper end middle part of insulating cantilever beam (1), 1 number gyro wheel (3) are installed in the upper end middle part of insulating cantilever beam (1), 1 number lockpin (2) are installed in the top of 1 number gyro wheel (3), 1 number lockpin (2) and 1 number gyro wheel (3) are parallel to each other and leave the clearance between the two, insulating cantilever beam (1) lower extreme and fixed pay-off (5) are through screw fixed connection.
2. A wire payoff device as claimed in claim 1, wherein: the front side, the rear side, the left side and the right side of the insulating cantilever beam (1) are sequentially provided with a plurality of holes (6) from top to bottom.
3. A wire payoff device as claimed in claim 2, wherein: the number of the holes (6) is 3, 4, 5 and 6.
4. A wire payoff device as claimed in claim 1, wherein: the fixed pay-off device (5) comprises a groove (5-1) and a puller bolt (5-2);
the horizontal section of the groove (5-1) is arranged on the lower end face of the insulating cantilever beam (1), and the angle iron of the cross arm is fixedly arranged in the groove (5-1) through a puller bolt (5-2) 2.
5. The wire payoff device as claimed in claim 4, wherein: the number of the jacking bolts (5-2) is 1 or 2.
6. A wire pay-off device is characterized in that: the device comprises an insulating cantilever beam (1), a No. 2 lock pin (8), a No. 2 idler wheel (9), a No. 1 hoisting device (10), a No. 3 lock pin (11), a No. 3 idler wheel (12), a No. 2 hoisting device (13) and a clamp (14);
the No. 1 hoisting device (10) comprises a No. 1 hoisting rod (10-1) and a No. 1 hoisting fixed pay-off device (10-2);
the No. 1 hoisting rod (10-1) is fixedly connected with the No. 1 hoisting fixing pay-off device (10-2), and the No. 1 hoisting rod (10-1) and the No. 1 hoisting fixing pay-off device (10-2) are an integral piece;
one end of the No. 1 hoisting rod (10-1) is fixedly connected with one end of the insulating cantilever beam (1) through a threaded lock catch, the No. 1 hoisting rod (10) is vertically connected with the insulating cantilever beam (1), the front end of the No. 1 hoisting fixing pay-off device (10-2) is provided with a No. 2 roller (9), the rear end of the No. 1 hoisting fixing pay-off device (10-2) is provided with a No. 2 lock pin (8), the No. 2 lock pin (8) is positioned above the No. 2 roller (9), and the two are arranged in parallel;
the No. 2 hoisting device (13) comprises a No. 2 hoisting rod (13-1) and a No. 2 hoisting fixed pay-off device (13-2);
one end of the No. 2 hoisting rod (13-1) is fixedly connected with the other end of the insulating cantilever beam (1) through another threaded lock catch, the No. 2 hoisting rod (13) is vertically connected with the insulating cantilever beam (1), the front end of the No. 2 hoisting fixing pay-off device (13-2) is provided with a No. 3 roller (12), the rear end of the No. 2 hoisting fixing pay-off device (13-2) is provided with a No. 3 lock pin (11), the No. 3 lock pin (11) is positioned above the No. 3 roller (12), and the two are arranged in parallel;
and a clamp (14) is arranged at one end part of the insulating cantilever beam (1).
7. The wire payoff device as claimed in claim 6, wherein: the front side and the rear side of the insulating cantilever beam (1) are sequentially provided with a plurality of holes (6) from top to bottom.
8. The wire payoff device as claimed in claim 7, wherein: the number of the holes (6) is 6, 7, 8 or 9.
9. The wire payoff device as claimed in claim 6, wherein: the fixture (14) comprises a fixed jaw (14-1) and a fixed chain (14-2);
the fixed chain (14-2) is fixedly connected to one end of the fixed jaw (14-1), the fixed jaw (14-1) is fixed on the end face of the telegraph pole, and the fixed chain (14-2) is wrapped on the telegraph pole.
10. The wire payoff device as claimed in claim 6, wherein: the No. 1 hoisting (10) and the No. 2 hoisting (13) are both made of steel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110377102.5A CN112886474A (en) | 2021-04-08 | 2021-04-08 | Wire pay-off device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110377102.5A CN112886474A (en) | 2021-04-08 | 2021-04-08 | Wire pay-off device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112886474A true CN112886474A (en) | 2021-06-01 |
Family
ID=76040556
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110377102.5A Pending CN112886474A (en) | 2021-04-08 | 2021-04-08 | Wire pay-off device |
Country Status (1)
| Country | Link |
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| CN (1) | CN112886474A (en) |
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|---|---|---|---|---|
| CN101557087A (en) * | 2009-01-20 | 2009-10-14 | 重庆市电力公司江北供电局 | High-voltage live working insulating hanging pole |
| JP2011072150A (en) * | 2009-09-28 | 2011-04-07 | Chugoku Electric Power Co Inc:The | Sheave device |
| CN102420401A (en) * | 2011-12-09 | 2012-04-18 | 河南省电力公司郑州供电公司 | Triangular insulating hanging fulcrum bar |
| CN202474707U (en) * | 2012-03-23 | 2012-10-03 | 宁夏电力公司吴忠供电局 | Paying-off pulley device of power overhead line |
| CN202474703U (en) * | 2012-03-21 | 2012-10-03 | 山东电力集团公司枣庄供电公司 | Overhead ground wire lifting mechanism |
| CN202978096U (en) * | 2012-11-01 | 2013-06-05 | 湖北省电力公司检修分公司 | Tower body propping pulley applied to extra-high voltage |
| CN204205416U (en) * | 2014-10-30 | 2015-03-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | 500kV multiple-circuit on same tower tangent tower turnover equipotential exclusive guideway |
| CN207530438U (en) * | 2017-11-30 | 2018-06-22 | 国网内蒙古东部电力有限公司检修分公司 | Tangent tower ground wire line lifter |
| CN209786641U (en) * | 2019-06-10 | 2019-12-13 | 国网黑龙江省电力有限公司哈尔滨供电公司 | Electric power liftable unwrapping wire pulley gear |
| CN211480747U (en) * | 2020-03-02 | 2020-09-11 | 国网通用航空有限公司 | Ground wire lifter utilizing construction hole operation |
-
2021
- 2021-04-08 CN CN202110377102.5A patent/CN112886474A/en active Pending
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101557087A (en) * | 2009-01-20 | 2009-10-14 | 重庆市电力公司江北供电局 | High-voltage live working insulating hanging pole |
| JP2011072150A (en) * | 2009-09-28 | 2011-04-07 | Chugoku Electric Power Co Inc:The | Sheave device |
| CN102420401A (en) * | 2011-12-09 | 2012-04-18 | 河南省电力公司郑州供电公司 | Triangular insulating hanging fulcrum bar |
| CN202474703U (en) * | 2012-03-21 | 2012-10-03 | 山东电力集团公司枣庄供电公司 | Overhead ground wire lifting mechanism |
| CN202474707U (en) * | 2012-03-23 | 2012-10-03 | 宁夏电力公司吴忠供电局 | Paying-off pulley device of power overhead line |
| CN202978096U (en) * | 2012-11-01 | 2013-06-05 | 湖北省电力公司检修分公司 | Tower body propping pulley applied to extra-high voltage |
| CN204205416U (en) * | 2014-10-30 | 2015-03-11 | 中国南方电网有限责任公司超高压输电公司柳州局 | 500kV multiple-circuit on same tower tangent tower turnover equipotential exclusive guideway |
| CN207530438U (en) * | 2017-11-30 | 2018-06-22 | 国网内蒙古东部电力有限公司检修分公司 | Tangent tower ground wire line lifter |
| CN209786641U (en) * | 2019-06-10 | 2019-12-13 | 国网黑龙江省电力有限公司哈尔滨供电公司 | Electric power liftable unwrapping wire pulley gear |
| CN211480747U (en) * | 2020-03-02 | 2020-09-11 | 国网通用航空有限公司 | Ground wire lifter utilizing construction hole operation |
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