CN111431089A - Electrified crossing construction net sealing method for power transmission line - Google Patents

Electrified crossing construction net sealing method for power transmission line Download PDF

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Publication number
CN111431089A
CN111431089A CN202010327527.0A CN202010327527A CN111431089A CN 111431089 A CN111431089 A CN 111431089A CN 202010327527 A CN202010327527 A CN 202010327527A CN 111431089 A CN111431089 A CN 111431089A
Authority
CN
China
Prior art keywords
rope
ground
line
safety net
transmission line
Prior art date
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.)
Pending
Application number
CN202010327527.0A
Other languages
Chinese (zh)
Inventor
李欣
汪盛
佘上正
刘彬
祝勇
方雄
赵春枫
盛勇
陈小元
朱培能
高国平
周哲
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Hunan Power Transmission And Transformation Engineering Co ltd
State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Original Assignee
Hunan Power Transmission And Transformation Engineering Co ltd
State Grid Corp of China SGCC
State Grid Hunan Electric Power Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Hunan Power Transmission And Transformation Engineering Co ltd, State Grid Corp of China SGCC, State Grid Hunan Electric Power Co Ltd filed Critical Hunan Power Transmission And Transformation Engineering Co ltd
Priority to CN202010327527.0A priority Critical patent/CN111431089A/en
Publication of CN111431089A publication Critical patent/CN111431089A/en
Pending legal-status Critical Current

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Classifications

    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02GINSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G1/00Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
    • H02G1/02Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables

Abstract

The invention discloses a method for blocking a live crossover construction of a power transmission line, which comprises the following steps: 1. arranging a tension field and a traction field in a pay-off section of the power transmission line to which the spanning gear belongs; 2. in the spanning gear, a temporary supporting spanning frame is arranged between the spanned line and the large-size side of the low-side iron tower, and two pairs of temporary supporting spanning frames are arranged under each phase line; 3. ground anchors are arranged between the large-size side of the low-side iron tower and the temporary supporting spanning frame and between the spanned line and the small-size side of the high-side iron tower; 4. spreading a bearing rope, wherein one end of the bearing rope is anchored to the ground anchor through the ground anchor after passing through the temporary supporting crossing frame, and the other end of the bearing rope is directly anchored to the ground through the ground anchor; 5. dragging and dropping a safety net between two in-phase bearing ropes of a spanned line; 6. adjusting the distance between the safety net and the spanning object; 7. and the distance between the safety net and the strided line is adjusted to ensure that the vertical distance between the accident state safety net and the strided line is more than 5 m. The position characteristics of the spanned objects are utilized, the overhead operation is reduced, and the net sealing operation efficiency and the safety and reliability are improved.

Description

Electrified crossing construction net sealing method for power transmission line
Technical Field
The invention belongs to the technical field of construction of crossing live lines of power transmission lines, and particularly relates to a method for blocking live crossing construction of power transmission lines.
Background
At present, the following modes are mainly adopted in a charged crossing net sealing mode: firstly, adopting tower-assembling steel holding rods as bearing beams to support the iron towers on two sides of a spanning rail, hanging protective tools such as bearing ropes, safety nets and the like, and carrying out net sealing on a spanned live line; and secondly, aiming at the condition that the low-voltage line or overhead line is low in voltage level, wood, moso bamboo or steel tube crossing frames are erected on two sides of the crossed line, and a net sealing device is hung to seal the crossed live line. The first approach is not applicable to large step-by-step distances; the second mode is not suitable for the situation that the height of the overhead line is high and is more restricted by the terrain.
Disclosure of Invention
The invention aims to provide a live crossing construction net sealing method for a power transmission line, which is suitable for various spans and has few terrain constraint conditions aiming at the defects of the prior art.
The invention provides a method for closing a net in electrified crossing construction of a power transmission line, wherein a height difference exists between two crossing iron towers, and the method comprises the following steps:
step one, arranging a tension field and a traction field in a pay-off section of a power transmission line to which a crossing gear belongs;
step two, in the spanning gear, a temporary supporting spanning frame is arranged between the spanned line and the large-size side of the low-side iron tower, and two pairs of temporary supporting spanning frames are arranged under each phase line;
thirdly, arranging ground anchors between the large-size side of the low-side iron tower and the temporary supporting spanning frame and between the spanned line and the small-size side of the high-side iron tower;
step four, spreading the bearing rope, wherein one end of the bearing rope is anchored to the ground anchor through the ground anchor after passing through the temporary supporting crossing frame, and the other end of the bearing rope is directly anchored to the ground through the ground anchor;
fifthly, dragging and dropping a safety net between two bearing ropes in the same phase of the line to be spanned;
step six, adjusting the distance between the safety net and the spanning object;
and seventhly, adjusting the distance between the safety net and the crossed line to ensure that the vertical distance between the accident state safety net and the crossed line is more than 5 m.
Further, in the first step, the distance between the traction field and the tension field is less than 8 kilometers.
In the second step, the temporary support crossing frame is a holding pole, a plurality of ground pull wires are arranged outside the temporary support crossing frame, ground anchors are matched with the bottom ends of the ground pull wires, the buried depth of the ground anchors is not less than 2.5m, the included angle between the stress direction of the ground anchors and the horizontal direction is not more than 30 degrees, and the included angle between the ground pull wires and the ground is not more than 45 degrees.
In the third step, the buried depth of the ground anchor is not less than 2 meters, and the included angle between the stress direction of the ground anchor and the horizontal direction is not more than 30 degrees.
In the fourth step, a nylon pulley is hung on the temporary support crossing frame, the primary guide rope and the secondary guide rope are sequentially unfolded through the power umbrella, and then the bearing rope is installed, wherein the included angle of the bearing rope to the ground is not more than 30 degrees.
The bearing rope comprises a Dinima rope, an anti-bending connector and a shackle; each section of the Dyneema rope is connected through a bending-resistant connector, the Dyneema ropes at two ends are wound on a brake in a splayed shape and locked through shackle, the Dyneema rope at the tail end of the bearing rope penetrates through the brake and then is fixed by adopting rope clamps, the number of the rope clamps is not less than 3, and the distance between the rope clamps is not less than 6 times of the diameter of the Dyneema rope; the other end of the brake is anchored with the ground through a steel wire rope.
And in the sixth step, after the distance between the safety net and the cross-domain object is measured, the safety net is adjusted through a tension field and a traction field.
And seventhly, arranging a control pull line on the bearing rope at a position close to the safety net to adjust the vertical distance between the safety net and the spanned object.
After the safety net is laid, a temporary stay wire is arranged on the bearing rope so as to reduce the windage yaw amplitude of the safety net.
The temporary support crossing frame is arranged on one side of the crossed live transmission line and used as a supporting device of the bearing rope, the bearing rope is anchored on the ground after passing through the temporary support crossing frame, the bearing rope is directly anchored on the ground on the other side, and the crossed power line is capped and protected by hanging the insulating safety net on the bearing rope. The characteristics of the site terrain and the position of the spanned object are effectively utilized, the high-altitude operation and the risk are reduced, the configuration of tools and equipment is reduced, and the net sealing operation efficiency and the safety and the reliability are improved.
Drawings
FIG. 1 is a cross-sectional view of a preferred embodiment of the present invention.
FIG. 2 is a layout view across a job site.
Fig. 3 is a schematic view of the arrangement of the cross-gear plane in the preferred embodiment.
Fig. 4 is the connection diagram of the tail end of the bearing rope in the preferred embodiment.
Sequence numbers of the drawings:
1-a transreceiver; 2-low side tower; 3-temporary supporting spanning frame; 4-high side iron tower; 5, anchoring the ground; 6-bearing rope; 7, a brake; 8, rope clamping; 9-steel wire rope; 01-safety net.
Detailed Description
As shown in fig. 1, the live crossing construction blocking method for the power transmission line disclosed in the embodiment is particularly suitable for the working condition that the towers on two sides of the crossed line have height difference. The construction is carried out according to the following steps:
step one, as shown in fig. 2, arranging a tension field and a traction field in a pay-off section of a power transmission line to which a crossing gear belongs, wherein the distance between the tension field and the traction field is less than eight kilometers; and selecting the place where construction equipment is convenient to enter according to different terrains of iron towers of the power transmission line.
Step two, in the spanning gear, a temporary supporting spanning frame 3 is arranged between the spanned line 1 and the large-size side of the low-side iron tower 2, two pairs of temporary supporting spanning frames are arranged under each phase line, and the distance is 6 m; the temporary supporting crossing frame adopts a 380mm steel holding pole (the allowable central axial pressure is less than or equal to 120kN), and a nylon pulley is hung on the temporary supporting crossing frame.
And four phi 16 stay wires are arranged outside each pair of temporary supporting crossing frames, the included angle of the stay wires to the ground is not more than 45 degrees, each stay wire is provided with a 100kN ground anchor, the buried depth is not less than 2.5m, and the included angle between the stress direction of the ground anchor and the horizontal direction is not more than 30 degrees.
And step three, arranging ground anchors 5 between the large-size side of the low-side iron tower and the temporary supporting spanning frame and between the spanned line and the small-size side of the high-side iron tower 4.
When the ground anchor is arranged, a group of (6) 50kN ground anchors are arranged on a small size of a high-side iron tower, a group of (6) 50kN ground anchors are arranged at a 230m position on a large size side of a low-side iron tower, the buried depth of the ground anchor is not less than 2 m, the included angle between the stress direction of the ground anchor and the horizontal direction is not more than 30 degrees, and meanwhile, the included angle between the main force bearing rope and the ground is not more than 30 degrees.
And step four, spreading the bearing rope 6 on the basis of the temporary support crossing frame, wherein two ends of the bearing rope are respectively connected with corresponding 50kN ground anchors.
During installation, the power umbrella is used for sequentially unfolding the primary guide rope and the secondary guide rope and then installing the bearing rope.
The carrier rope is composed of a phi 18 Dyneema rope, 50kN bending resistant connectors and 50kN shackles, all sections of the Dyneema ropes are connected through the bending resistant connectors, as shown in figure 4, the Dyneema ropes at two ends are wound on the brake 7 in a splayed shape and locked through the shackles, the Dyneema ropes at the tail end of the carrier rope penetrate through the brake and then are fixed by the rope clamps 8, the number of the rope clamps is not less than three, and the distance between the rope clamps is not less than six times of the diameter of the Dyneema ropes; the other end of the brake is anchored with the ground anchor through a steel wire rope 9.
And one end of the bearing rope is adjusted by using a 60kN lever block, and after the adjustment is finished, the load is transferred to the steel wire rope, so that the safety distance of the safety net to the spanned object is ensured.
And fifthly, dragging and dropping the safety net 01 between the two catenary lines in the same phase of the spanned line.
And step six, measuring the distance between the safety net and the spanning object by using an instrument, and informing two commanders to adjust the safety net after measuring data.
Step seven, adjusting the distance between the safety net and the spanned object: when the wires are laid out, the vertical distance between the safety net and the spanned object is 5 meters. When the hauling rope passes through the safety net, the vertical distance between the hauling rope and the safety net is controlled within 3 meters; when the wire passes through the safety net, the vertical distance between the wire and the safety net is controlled within 3 meters. The vertical distance between the safety net and the spanned object is ensured to be more than 5 meters under the accident condition. And a control pull line is arranged on the bearing rope at a position close to the safety net to adjust the vertical distance between the safety net and the spanned object.
After the position adjustment is finished, netting, connecting the safety nets together through safety hooks, and clamping and anchoring net corners of the safety nets and the bearing ropes; the head and tail of the safety net, and the joint of the safety net and the safety net need to be sealed by DuPont ropes and clamped with the main bearing ropes. After the safety net is laid, temporary stay wires need to be arranged on the bearing ropes so as to reduce the windage yaw amplitude of the safety net.
If the construction period is in the process of construction, and the anchor needs to be anchored overnight after the carrier rope is transited, double insurance needs to be set. After the double insurance is set, the twisted and ground part must be slowly loosened to ensure that the double insurance is anchored after being properly stressed.
The temporary support crossing frame is arranged on one side of the crossed live transmission line and used as a supporting device of the bearing rope, the bearing rope is anchored on the ground after passing through the temporary support crossing frame, the bearing rope is directly anchored on the ground on the other side, and the crossed power line is capped and protected by hanging the insulating safety net on the bearing rope. The characteristics of the site terrain and the position of the spanned object are effectively utilized, the high-altitude operation and the risk are reduced, the configuration of tools and equipment is reduced, and the net sealing operation efficiency and the safety and the reliability are improved.

Claims (9)

1. A method for blocking a power transmission line live crossing construction network is characterized by comprising the following steps:
step one, arranging a tension field and a traction field in a pay-off section of a power transmission line to which a crossing gear belongs;
step two, in the spanning gear, a temporary supporting spanning frame is arranged between the spanned line and the large-size side of the low-side iron tower, and two pairs of temporary supporting spanning frames are arranged under each phase line;
thirdly, arranging ground anchors between the large-size side of the low-side iron tower and the temporary supporting spanning frame and between the spanned line and the small-size side of the high-side iron tower;
step four, spreading the bearing rope, wherein one end of the bearing rope is anchored to the ground anchor through the ground anchor after passing through the temporary supporting crossing frame, and the other end of the bearing rope is directly anchored to the ground through the ground anchor;
fifthly, dragging and dropping a safety net between two bearing ropes in the same phase of the line to be spanned;
step six, adjusting the distance between the safety net and the spanning object;
and seventhly, adjusting the distance between the safety net and the crossed line to ensure that the vertical distance between the accident state safety net and the crossed line is more than 5 m.
2. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: in the first step, the distance between the traction field and the tension field is less than 8 kilometers.
3. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: in the second step, the temporary support crossing frame is a holding pole, a plurality of ground pull wires are arranged outside the temporary support crossing frame, ground anchors are matched with the bottom ends of the ground pull wires, the buried depth of the ground anchors is not less than 2.5m, the included angle between the stress direction of the ground anchors and the horizontal direction is not more than 30 degrees, and the included angle between the ground pull wires and the ground is not more than 45 degrees.
4. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: in the third step, the buried depth of the ground anchor is not less than 2 meters, and the included angle between the stress direction of the ground anchor and the horizontal direction is not more than 30 degrees.
5. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: in the fourth step, a nylon pulley is hung on the temporary support crossing frame, the primary guide rope and the secondary guide rope are sequentially unfolded through the power umbrella, and then the bearing rope is installed, wherein the included angle of the bearing rope to the ground is not more than 30 degrees.
6. The live-wire crossing construction blocking method for the transmission line according to claim 5, characterized in that: the bearing rope comprises a Dinima rope, an anti-bending connector and a shackle; each section of the Dyneema rope is connected through a bending-resistant connector, the Dyneema ropes at two ends are wound on a brake in a splayed shape and locked through shackle, the Dyneema rope at the tail end of the bearing rope penetrates through the brake and then is fixed by adopting rope clamps, the number of the rope clamps is not less than 3, and the distance between the rope clamps is not less than 6 times of the diameter of the Dyneema rope; the other end of the brake is anchored with the ground through a steel wire rope.
7. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: and in the sixth step, after the distance between the safety net and the cross-domain object is measured, the safety net is adjusted through a tension field and a traction field.
8. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: and seventhly, arranging a control pull line on the bearing rope at a position close to the safety net to adjust the vertical distance between the safety net and the spanned object.
9. The live-wire crossing construction blocking method for the transmission line according to claim 1, characterized in that: after the safety net is laid, a temporary stay wire is arranged on the bearing rope so as to reduce the windage yaw amplitude of the safety net.
CN202010327527.0A 2020-04-23 2020-04-23 Electrified crossing construction net sealing method for power transmission line Pending CN111431089A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010327527.0A CN111431089A (en) 2020-04-23 2020-04-23 Electrified crossing construction net sealing method for power transmission line

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010327527.0A CN111431089A (en) 2020-04-23 2020-04-23 Electrified crossing construction net sealing method for power transmission line

Publications (1)

Publication Number Publication Date
CN111431089A true CN111431089A (en) 2020-07-17

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Application Number Title Priority Date Filing Date
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Country Status (1)

Country Link
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Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2813610A1 (en) * 1978-03-30 1979-10-04 Bbc Brown Boveri & Cie Overhead protective suspension net erection - uses slider mechanism mounted between masts in first row of support uprights to pull net up into required position
CN104577875A (en) * 2014-12-29 2015-04-29 国家电网公司 Construction method of block crossover frame cable of power circuit
CN107902582A (en) * 2017-11-14 2018-04-13 汇源电气有限公司 Steep mountain carrying process on a kind of new concrete electric pole
CN207381867U (en) * 2017-11-08 2018-05-18 国网甘肃省电力公司经济技术研究院 Alive circuit light multipurpose crossing frame
CN108134339A (en) * 2017-12-14 2018-06-08 浙江省送变电工程有限公司 Assembly type overhead construction method across in isolated shelves high ferro
CN108396633A (en) * 2018-02-02 2018-08-14 中铁四局集团第二工程有限公司 Across the valley suspension bridge pumping beam body concrete construction method of one kind and device
CN207919317U (en) * 2018-02-02 2018-09-28 中铁四局集团第二工程有限公司 Across the valley suspension bridge of one kind pumping beam body concrete working device
CN109494621A (en) * 2018-12-29 2019-03-19 国家电网有限公司 Transmission line of electricity block device
CN109768502A (en) * 2019-01-30 2019-05-17 江苏省送变电有限公司 A kind of transmission line of electricity not overboard lead over strait puts Di Nima construction method

Patent Citations (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2813610A1 (en) * 1978-03-30 1979-10-04 Bbc Brown Boveri & Cie Overhead protective suspension net erection - uses slider mechanism mounted between masts in first row of support uprights to pull net up into required position
CN104577875A (en) * 2014-12-29 2015-04-29 国家电网公司 Construction method of block crossover frame cable of power circuit
CN207381867U (en) * 2017-11-08 2018-05-18 国网甘肃省电力公司经济技术研究院 Alive circuit light multipurpose crossing frame
CN107902582A (en) * 2017-11-14 2018-04-13 汇源电气有限公司 Steep mountain carrying process on a kind of new concrete electric pole
CN108134339A (en) * 2017-12-14 2018-06-08 浙江省送变电工程有限公司 Assembly type overhead construction method across in isolated shelves high ferro
CN108396633A (en) * 2018-02-02 2018-08-14 中铁四局集团第二工程有限公司 Across the valley suspension bridge pumping beam body concrete construction method of one kind and device
CN207919317U (en) * 2018-02-02 2018-09-28 中铁四局集团第二工程有限公司 Across the valley suspension bridge of one kind pumping beam body concrete working device
CN109494621A (en) * 2018-12-29 2019-03-19 国家电网有限公司 Transmission line of electricity block device
CN109768502A (en) * 2019-01-30 2019-05-17 江苏省送变电有限公司 A kind of transmission line of electricity not overboard lead over strait puts Di Nima construction method

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