CN113572117B - Device and method for realizing overhead drilling by adopting single-trunk-shaped terminal tower - Google Patents
Device and method for realizing overhead drilling by adopting single-trunk-shaped terminal tower Download PDFInfo
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- CN113572117B CN113572117B CN202110651329.4A CN202110651329A CN113572117B CN 113572117 B CN113572117 B CN 113572117B CN 202110651329 A CN202110651329 A CN 202110651329A CN 113572117 B CN113572117 B CN 113572117B
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- 238000004519 manufacturing process Methods 0.000 abstract description 2
- 229910000831 Steel Inorganic materials 0.000 description 4
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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
- H02G7/00—Overhead installations of electric lines or cables
- H02G7/20—Spatial arrangements or dispositions of lines or cables on poles, posts or towers
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/08—Structures made of specified materials of metal
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/24—Cross arms
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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
- H02G1/04—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for overhead lines or cables for mounting or stretching
Abstract
The invention discloses a device and a method for realizing overhead drilling crossing by adopting a single-trunk-shaped terminal tower, which comprises a first crossing tower and a second crossing tower, wherein the first crossing tower and the second crossing tower are arranged on the same axis, a crossing lead and two horizontally-arranged crossing ground wires are connected between the first crossing tower and the second crossing tower, and the crossing ground wires are arranged above the crossing lead; the first crossing tower and the second crossing tower are symmetrically arranged on two sides of the two crossing ground wires, the first crossing tower and the second crossing tower are symmetrically arranged on the same axis, a horizontally-arranged single-loop three-phase crossing lead and the two horizontally-arranged crossing ground wires are connected between the first crossing tower and the second crossing tower, and the axis formed by the first crossing tower and the second crossing tower is orthogonal or oblique to the axis formed by the first crossing tower and the second crossing tower; the crossing lead and the crossing ground wire in the crossing rail are above the drilling lead and the drilling ground wire, the drilling ground wire is below the drilling lead, and the drilling ground wire outside the crossing rail is above the drilling lead. The invention can realize a lower overhead drilling method, reduce cable drilling and greatly reduce the manufacturing cost.
Description
Technical Field
The invention relates to a device and a method for realizing overhead drilling by adopting a single-return-to-dry terminal tower, belonging to the technical field of overhead transmission lines.
Background
So far, the crossing modes of a single overhead transmission line mainly include the following modes: 1. the more the cable is drilled, the more the cost is 3-4 times of that of the overhead drill; 2. the steel pipe double-rod structure is adopted, three-phase wires are designed to be horizontally arranged, overhead drilling is conducted, and the manufacturing cost is about 1 time that of an angle steel tower; 3. a dry-type angle steel tower is adopted, three-phase wires are arranged in a triangular mode, and overhead drilling is conducted; 4. a wine glass type angle steel tower is adopted, three-phase leads are horizontally arranged, and overhead drilling is more convenient; according to the introduction of related documents, the flashover prevention capability of the wine cup type corner tower is superior to that of the dry type corner tower, but the ice coating overload capability of the crank arm structure of the wine cup type corner tower is poor under the condition of bearing large uneven ice load, and the structural hidden danger exists; the ground wires of the latter three schemes are designed conventionally, i.e. the arrangement mode of the ground wires on the upper part and the lead wires on the lower part, and when the safe distance between the ground wires and the crossing lead wires is not enough, only the first scheme can be selected. For a 110kV dry-character-shaped terminal tower, the vertical distance between a middle phase lead and a side lead is 3.5m, the vertical distance between a ground wire and the middle phase lead is 3.0m, the total vertical distance between the ground wire and the middle phase lead is 6.5m, the minimum nominal height of the terminal tower is 9m, and the minimum total height of the terminal tower is 15.5m; the safety distance between the 110kV crossed ground wire and the 110kV crossed wire is 3m, the safety distance between the 110kV crossed wire and the 220kV crossed wire is 4m, the minimum ground height of the 110kV crossed wire which is drilled is 18.5m, and the minimum ground height of the 220kV crossed wire which is drilled is 19.5m. For a 220kV dry-character-shaped terminal tower, the vertical distance between a ground wire and a lower phase conductor is 9.5m, the minimum nominal height of the terminal tower is 9m, and the minimum total height of the terminal tower is 18.5m; a safe distance from the 220kV crossover conductor is 4m, the minimum ground height of the 220kV crossover conductor drilled over is 22.5m. In addition, the measurement and construction errors are also considered to be 0.5-1.0 m; according to the statistics of the prior engineering design project, the overhead drilling scheme accounts for 30-40%, and the cable drilling scheme accounts for 60-70%. A lower overhead drill crossing design scheme is designed, a cable drill crossing scheme is avoided, the construction cost is reduced, and the overhead drill crossing design scheme is urgent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for realizing overhead drilling by adopting a single-trunk-shaped terminal tower, which can enable a 110-220 kV drilling line to smoothly pass through a crossing part under the condition of crossing a lead to the ground by 12-13 m.
The technical scheme provided by the invention is as follows: a device for realizing overhead drilling by adopting a single-trunk-shaped terminal tower is characterized by comprising a first spanning tower and a second spanning tower, wherein the first spanning tower and the second spanning tower are arranged on the same axis, a spanning wire and two horizontally-arranged spanning ground wires are connected between the first spanning tower and the second spanning tower, and the spanning ground wires are arranged above the spanning wire; the first crossing tower and the second crossing tower are symmetrically arranged on two sides of the two crossing ground wires, the first crossing tower and the second crossing tower are symmetrically arranged on one axis, a horizontally-arranged single-loop three-phase crossing wire and the two horizontally-arranged crossing ground wires are connected between the first crossing tower and the second crossing tower, and the axis formed by the first crossing tower and the second crossing tower is orthogonal or oblique to the axis formed by the first crossing tower and the second crossing tower; the crossing lead and the crossing ground wire in the crossing rail are above the drilling lead and the drilling ground wire, the drilling ground wire is below the drilling lead, and the drilling ground wire outside the crossing rail is above the drilling lead.
Furthermore, the first tower crossing by drilling and the second tower crossing by drilling both comprise a wire cross arm and a ground wire cross arm, two lightning rods are arranged on the ground wire cross arm, one end of the ground wire cross arm is provided with a jumper wire bracket, and the lower parts of the two ends of the jumper wire bracket are respectively connected with a post insulator; the middle part and both ends of wire cross arm all are connected with wire strain insulator-string, and the bracing symmetry level of wire cross arm is connected with post insulator.
Furthermore, the first crossing tower and the second crossing tower are 10-15 m away from the two crossing ground lines.
Further, the distance between the first drilling tower and the second drilling tower is between 20 and 40 m; the ground wire crossing the drill is fixed on the tower body through the ground wire strain insulator-string, the vertical distance between the ground wire crossing the drill and the lead wire is 3.0-3.5 m, and the ground height is 5.5-6.0 m; the sag of the ground wire is 0.5m when the drill goes over, and the sag of the wire is 1.0m when the drill goes over.
Furthermore, the middle phase drill crossing wire sequentially passes through a middle phase tension string high-voltage end at the small-size side, a post insulator high-voltage end on an inclined strut of a wire cross arm at the small-size side, two post insulators below the jumper wire support, a post insulator high-voltage end on an inclined strut of a wire cross arm at the large-size side and a middle phase tension string high-voltage end at the large-size side.
Furthermore, the length of the jumper wire support is the same as the distance of the projection of the high-voltage end of the two middle-phase tension string on the large and small sides of the first crossing tower or the second crossing tower on the horizontal plane.
Furthermore, the crossing wire is a single-loop three-phase wire or a double-loop six-phase wire, and each phase wire can be a single wire or a double-split wire and is arranged horizontally or vertically.
A method for realizing overhead drilling by adopting a single-trunk-shaped terminal tower comprises the following steps:
1) Arranging a first spanning tower and a second spanning tower on one axis, connecting a horizontally arranged single-loop three-phase spanning lead and two horizontally arranged spanning ground wires between the first spanning tower and the second spanning tower, wherein the spanning ground wires are arranged above the spanning lead, and determining a spanning or drilling position between the first spanning tower and the second spanning tower according to the terrain;
2) Arranging a first crossing tower and a second crossing tower on two sides of two crossing ground wires, wherein strain insulators of middle phase wires of the first crossing tower and the second crossing tower are hung in the middle of a wire cross arm, and the first crossing tower and the second crossing tower are symmetrically arranged on one axis, and the distance between the first crossing tower and the second crossing tower is 20-40 m;
3) A horizontally arranged single-loop three-phase crossing lead and two horizontally arranged crossing ground wires are connected between the first crossing tower and the second crossing tower; the axis formed by the first crossing tower and the second crossing tower is orthogonal or oblique to the axis formed by the first drilling tower and the second drilling tower; crossing wires and crossing ground wires in the crossing gear are above the drilling crossing wires and the drilling crossing ground wires, the drilling crossing ground wires are below the drilling crossing wires, and the drilling crossing ground wires outside the crossing gear are above the drilling crossing wires;
4) The first drilling tower and the second drilling tower are 10-15 m away from the two crossing ground wires, and two lightning arresters in the crossing gear and two lightning arresters on the first drilling tower and the second drilling tower are ensured to form combined lightning protection for the three drilling wires;
5) The ground wire crossing the drill is fixed on the tower body through the ground wire tension string, the vertical distance between the ground wire crossing the drill is 3.0-3.5 m, the safety distance of the opposite wire to the ground wire under the asynchronous swinging of ice coating dancing or strong wind is met, and the ground height is 5.5-6.0 m; the arc of the ground wire which is drilled over is taken to be 0.5m no matter what the temperature is, and the ground wire is loosely erected;
6) The three-phase crossing wires are horizontally arranged, the sag is 1.0m no matter what the temperature is, and the three-phase crossing wires are loosely erected;
7) The middle phase drill passing through the wire sequentially passes through a middle phase tension string high-voltage end at the small-size side, a post insulator high-voltage end on an inclined strut of a wire cross arm at the small-size side, two post insulators below a jumper wire support, a post insulator high-voltage end on an inclined strut of a wire cross arm at the large-size side and a middle phase tension string high-voltage end at the large-size side, and is installed in a loose way;
8) The length of the jumper wire support is the same as the distance of the projections of the high-voltage ends of two middle-phase strain insulator-string in the large and small sides of the first crossing tower or the second crossing tower on the horizontal plane;
9) The post insulators are symmetrically and horizontally fixed below the inclined strut and the jumper wire bracket of the wire cross arm respectively.
The beneficial effects of the invention are:
1. the method adopts the first crossing tower and the second crossing tower to be close to the inclined lower parts of the two crossing ground wires as much as possible, and forms combined protection against the three crossing wires through the two crossing ground wires and the two lightning arresters on the first crossing tower and the second crossing tower;
2. according to the invention, the crossing ground wire in the crossing gear is arranged below the crossing wire, so that the crossing height is effectively compressed;
3. according to the method, three-phase crossing wires between a first crossing tower and a second crossing tower are horizontally arranged, and the crossing height is further compressed;
4. the length of a jumper wire bracket of a middle phase conductor is the same as the distance of the projection of the high-voltage end of the middle phase tension string on the large and small sides of a first crossing tower and a second crossing tower on a horizontal plane, so that the safety distance between the jumper wire of the middle phase conductor and a tower body is ensured;
5. the supporting insulators are symmetrically and horizontally fixed below the inclined struts and the jumper wire supports of the wire cross arm, so that the safety distance between the jumper wire of the middle-phase wire and the wire cross arm and the safety distance between the jumper wire of the middle-phase wire and the tower body are further ensured;
through the design, more overhead drills can be designed, and therefore the overhead drill has wide popularization value. The invention has the advantages of ingenious structural conception, simplicity and effectiveness, and can compress the heights of the crossing line and the crossing line to the maximum extent under the condition of ensuring the crossing safety distance, thereby effectively reducing the construction cost.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for overhead drilling using a single-return-to-dry terminal tower according to the present invention;
FIG. 2 is a schematic structural view of the spanning tower of FIG. 1;
FIG. 3 is a schematic structural view of the first drilling tower of FIG. 1;
fig. 4 is a schematic structural view of the second drilling tower of fig. 1.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1 to 4, an apparatus for realizing overhead drilling by using a single-trunk-shaped terminal tower comprises a first spanning tower 1 and a second spanning tower 2, wherein the first spanning tower 1 and the second spanning tower 2 are on one axis, a spanning wire 5 and two horizontally-arranged spanning ground wires 6 are connected between the first spanning tower 1 and the second spanning tower 2, the spanning wire 5 is a single-loop three-phase wire or a double-loop 6-phase wire, and each phase wire can be a single wire or a double-split wire, and is horizontally arranged or vertically arranged. Crossover ground 6 is above crossover conductor 5. The crossover conductor 5 between the first crossover tower 1 and the second crossover tower 2 in this embodiment is a single loop three-phase conductor arranged horizontally. The first climbing tower 3 and the second climbing tower 4 are symmetrically arranged on two sides of the two crossed ground lines 6, and the distance between the first climbing tower 3 and the second climbing tower 4 is 20-40 m. The first drilling tower 3 and the second drilling tower 4 both adopt non-standard single-loop trunk-shaped terminal towers (the towers are optimally designed on the basis of a known universal design tower type, for the universal design tower type, a middle-phase conductor strain string 12 is hung on a tower body and is arranged on a conductor cross arm 9, the vertical distance is 3.5m for 110kV, and the vertical distance is 5.5m for 220kV, the middle-phase conductor strain string 12 of the tower is hung in the middle position of the conductor cross arm 9), the first drilling tower 3 and the second drilling tower 4 both comprise the conductor cross arm 9 and a ground wire cross arm 10, two lightning rods 14 are arranged on the ground wire cross arm 10, one end of the ground wire cross arm 10 is provided with a jumper wire support 11, and the lower parts of the two ends of the jumper wire support 11 are respectively connected with a post insulator 13. The middle part and both ends of wire cross arm 9 all are connected with wire strain insulator-string 12, and the bracing symmetry level of wire cross arm 9 is connected with post insulator 13. The first drilling tower 3 and the second drilling tower 4 are symmetrically arranged on the same axis, a horizontally arranged single-loop three-phase drilling wire 7 and two horizontally arranged drilling ground wires 8 are connected between the first drilling tower and the second drilling tower, and each phase drilling wire 7 can be a single wire or a double split wire. The axis formed by the first crossing tower 1 and the second crossing tower 2 is orthogonal or oblique to the axis formed by the first drilling tower 3 and the second drilling tower 4; the crossing lead 5 and the crossing ground wire 6 in the crossing gear are above the drilling lead 7 and the drilling ground wire 8, the drilling ground wire 8 is below the drilling lead 7, the drilling ground wire 8 is fixed on the tower body through a ground wire tension string 15, the vertical distance between the drilling ground wire and the drilling lead 7 is 3.0-3.5 m, the safety distance of the opposite lead to the ground wire under the asynchronous swinging of ice coating dancing or strong wind and the like is met, and the ground height is 5.5-6.0 m; no matter the temperature, the drilled earth wire 8 is sagged by 0.5m and is loosely erected; off-grade drill-over ground wire 8 is above drill-over wire 7. The three-phase crossing wires 7 are horizontally arranged, the sag is 1.0m no matter what the temperature is, and the three-phase crossing wires are loosely erected. The middle drill crossing conductor 7 sequentially passes through the high-voltage end of the middle phase strain insulator string 12 on the small-size side, the high-voltage end of the post insulator 13 on the inclined strut of the conductor cross arm 9 on the small-size side, the high-voltage end of the post insulators 13 below the jumper wire bracket 11 and the high-voltage end of the post insulator 13 on the inclined strut of the conductor cross arm 9 on the large-size side, and the high-voltage end of the middle phase strain insulator string 12 on the large-size side, and is loosely mounted. The length of the jumper support 11 (i.e. the distance between the two post insulators 13 below the jumper support 11) is the same as the distance of the high-voltage end projection of the two middle phase tension strings 12 on the large and small number sides of the first drilled tower 3 or the second drilled tower 4 on the horizontal plane.
A method for realizing overhead drilling by adopting a single-return-to-dry terminal tower comprises the following steps:
1. a first spanning tower 1 and a second spanning tower 2 are arranged on one axis, a horizontally arranged single-loop three-phase spanning wire 5 and two horizontally arranged spanning ground wires 6 are connected between the first spanning tower 1 and the second spanning tower 2, the spanning ground wires 6 are arranged above the spanning wire 5, and a spanning (or drilling) position is determined between the first spanning tower 1 and the second spanning tower 2 according to terrain.
2. And a first drilling tower 3 and a second drilling tower 4 are arranged on two sides of the two crossing ground wires 6, the first drilling tower 3 and the second drilling tower 4 both adopt the non-standard single-trunk-type terminal tower, and the first drilling tower 3 and the second drilling tower 4 are symmetrically arranged on the same axis with the distance between the first drilling tower 3 and the second drilling tower 4 being 20-40 m.
3. A horizontally arranged single-loop three-phase crossing lead 7 and two horizontally arranged crossing ground wires 8 are connected between the first crossing tower 3 and the second crossing tower 4; the axis formed by the first crossing tower 1 and the second crossing tower 2 is orthogonal or oblique to the axis formed by the first drilling tower 3 and the second drilling tower 4; crossover wire 5 and crossover ground wire 6 within the crossover step are above drill-over wire 7 and drill-over ground wire 8, drill-over ground wire 8 is below drill-over wire 7, and drill-over ground wire 8 outside the crossover step is above drill-over wire 7.
4. The distance between the first drilling tower 3 and the second drilling tower 4 and the two crossing ground wires 6 is 10-15 m, so that the two crossing ground wires 6 in the crossing gear and the two lightning rods 14 on the first drilling tower 3 and the second drilling tower 4 form combined lightning protection for the three drilling wires 7;
5. the ground wire 8 is fixed on the tower body through the ground wire tension string 15, the vertical distance between the ground wire 8 and the ground wire 7 is 3.0-3.5 m, the safety distance of the opposite wires under asynchronous swinging such as icing waving or strong wind and the like to the ground wire is met, and the ground height is 5.5-6.0 m; no matter the temperature, the drilled earth wire 8 is sagged by 0.5m and is loosely erected;
6. the three-phase crossing wires 7 are horizontally arranged, the sag is 1.0m no matter what the temperature is, and the three-phase crossing wires are loosely erected.
7. The middle phase drill crosses the high-voltage end of the middle phase tension string 12 on the small-size side, the high-voltage end of the post insulator 13 on the inclined strut of the wire cross arm 9 on the small-size side, the high-voltage ends of the two post insulators 13 below the jumper wire bracket 11, the high-voltage end of the post insulator 13 on the inclined strut of the wire cross arm 9 on the large-size side and the high-voltage end of the middle phase tension string 12 on the large-size side in sequence, and is loosely mounted.
8. The length of the jumper support 11 (i.e. the distance between the two post insulators 13 below the jumper support 11) is the same as the distance of the high-voltage end projection of the two middle phase tension strings 12 on the large and small number sides of the first drilled tower 3 or the second drilled tower 4 on the horizontal plane.
9. The post insulators 13 are symmetrically and horizontally fixed below the diagonal brace of the wire cross arm 9 and the jumper support 11 respectively.
It should be understood that parts of the specification not set forth in detail are well within the prior art. Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. A device for realizing overhead drilling crossing by adopting a single-trunk-type terminal tower is characterized by comprising a first crossing tower (1) and a second crossing tower (2), wherein the first crossing tower (1) and the second crossing tower (2) are arranged on the same axis, a crossing lead (5) and two horizontally-arranged crossing ground wires (6) are connected between the first crossing tower (1) and the second crossing tower (2), and the crossing ground wires (6) are arranged above the crossing lead (5); the first crossing tower (3) and the second crossing tower (4) are symmetrically arranged on two sides of two crossing ground wires (6), the first crossing tower (3) and the second crossing tower (4) are symmetrically arranged on one axis, a horizontally-arranged single-loop three-phase crossing wire (7) and two horizontally-arranged crossing ground wires (8) are connected between the first crossing tower (3) and the second crossing tower (4), and the axis formed by the first crossing tower (1) and the second crossing tower (2) is orthogonal or oblique to the axis formed by the first crossing tower (3) and the second crossing tower (4); the crossing lead (5) and the crossing ground wire (6) in the crossing gear are above the drilling lead (7) and the drilling ground wire (8), the drilling ground wire (8) is below the drilling lead (7), and the drilling ground wire (8) outside the crossing gear is above the drilling ground wire (7); the first drilling tower (3) and the second drilling tower (4) both comprise a wire cross arm (9) and a ground wire cross arm (10), two lightning rods (14) are arranged on the ground wire cross arm (10), a jumper wire bracket (11) is arranged at one end of the ground wire cross arm (10), and post insulators (13) are connected below the two ends of the jumper wire bracket (11) respectively; the middle part and two ends of the wire cross arm (9) are both connected with wire strain insulator-strings (12), and the inclined struts of the wire cross arm (9) are symmetrically and horizontally connected with post insulators (13); the crossing wire (7) sequentially passes through a high-voltage end of a middle-phase tension string (12) on a small-size side, a high-voltage end of a post insulator (13) on an inclined strut of a wire cross arm (9) on the small-size side, two post insulators (13) below a jumper wire support (11), a high-voltage end of a post insulator (13) on an inclined strut of a wire cross arm (9) on a large-size side and a high-voltage end of a middle-phase tension string (12) on the large-size side.
2. The device for realizing aerial drilling by using the single-rod-shaped terminal tower is characterized in that the first drilling tower (3) and the second drilling tower (4) are 10-15 m away from two crossing ground wires (6).
3. The device for realizing aerial drilling by using the single-rod-shaped terminal tower is characterized in that the distance between the first drilling tower (3) and the second drilling tower (4) is between 20 and 40 m; the ground wire (8) is fixed on the tower body through a ground wire tension string (15), the vertical distance between the ground wire (8) and the ground wire (7) is 3.0-3.5 m, and the ground height is 5.5-6.0 m; the arc sag of the ground wire (8) is 0.5m, and the arc sag of the wire (7) is 1.0m.
4. The device for realizing aerial drilling crossing by adopting the single-trunk-shaped terminal tower is characterized in that the length of the jumper support (11) is the same as the distance of the high-voltage end projection of two middle-phase tension strings (12) on the large and small size sides of the first drilling tower (3) or the second drilling tower (4) on the horizontal plane.
5. The device for realizing the aerial drilling by using the single-trunk-shaped terminal tower is characterized in that the crossing conductor (5) is a single-loop three-phase conductor or a double-loop six-phase conductor, and each phase conductor can be a single conductor or a double-split conductor and is arranged horizontally or vertically.
6. A method for realizing overhead drilling by adopting a single-trunk-shaped terminal tower comprises the following steps:
1) Arranging a first spanning tower and a second spanning tower on one axis, connecting a horizontally arranged single-loop three-phase spanning lead and two horizontally arranged spanning ground wires between the first spanning tower and the second spanning tower, wherein the spanning ground wires are arranged above the spanning lead, and determining a spanning or drilling position between the first spanning tower and the second spanning tower according to the terrain;
2) Arranging a first crossing tower and a second crossing tower on two sides of two crossing ground wires, wherein strain insulators of middle phase wires of the first crossing tower and the second crossing tower are hung in the middle of a wire cross arm, and the first crossing tower and the second crossing tower are symmetrically arranged on one axis, and the distance between the first crossing tower and the second crossing tower is 20-40 m;
3) A horizontally arranged single-loop three-phase crossing lead and two horizontally arranged crossing ground wires are connected between the first crossing tower and the second crossing tower; the axis formed by the first crossing tower and the second crossing tower is orthogonal or oblique to the axis formed by the first drilling tower and the second drilling tower; crossing wires and crossing ground wires in the crossing gear are above the drilling crossing wires and the drilling crossing ground wires, the drilling crossing ground wires are below the drilling crossing wires, and the drilling crossing ground wires outside the crossing gear are above the drilling crossing wires;
4) The first drilling tower and the second drilling tower are 10-15 m away from the two crossing ground wires, and two lightning arresters in the crossing gear and two lightning arresters on the first drilling tower and the second drilling tower are ensured to form combined lightning protection for the three drilling wires;
5) The ground crossing wires are fixed on the tower body through the ground wire tension string, the vertical distance between the ground crossing wires and the ground crossing wires is 3.0-3.5 m, the safety distance of the opposite wires to the ground wires under asynchronous swinging of icing dancing or strong wind and the like is met, and the ground height is 5.5-6.0 m; the arc of the ground wire which is drilled over is taken to be 0.5m no matter what the temperature is, and the ground wire is loosely erected;
6) The three-phase crossing wires are horizontally arranged, the sag is 1.0m no matter what the temperature is, and the three-phase crossing wires are loosely erected;
7) The middle phase drill passing through the wire sequentially passes through a middle phase tension string high-voltage end at the small-size side, a post insulator high-voltage end on an inclined strut of a wire cross arm at the small-size side, two post insulators below a jumper wire support, a post insulator high-voltage end on an inclined strut of a wire cross arm at the large-size side and a middle phase tension string high-voltage end at the large-size side, and is installed in a loose way;
8) The length of the jumper support is the same as the distance of the projections of the high-voltage ends of two middle-phase strain insulator-string strings on the horizontal plane on the large and small sides of the first crossing tower or the second crossing tower;
9) The post insulators are symmetrically and horizontally fixed below the inclined strut and the jumper wire bracket of the wire cross arm respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110651329.4A CN113572117B (en) | 2021-06-11 | 2021-06-11 | Device and method for realizing overhead drilling by adopting single-trunk-shaped terminal tower |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110651329.4A CN113572117B (en) | 2021-06-11 | 2021-06-11 | Device and method for realizing overhead drilling by adopting single-trunk-shaped terminal tower |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113572117A CN113572117A (en) | 2021-10-29 |
| CN113572117B true CN113572117B (en) | 2022-11-22 |
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| CN202110651329.4A Active CN113572117B (en) | 2021-06-11 | 2021-06-11 | Device and method for realizing overhead drilling by adopting single-trunk-shaped terminal tower |
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| CN212957927U (en) * | 2020-07-10 | 2021-04-13 | 四川电力设计咨询有限责任公司 | Same-tower double-circuit overhead transmission line drilling tower |
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| CN103138206A (en) * | 2013-03-19 | 2013-06-05 | 黑河电业局 | Device and method to replace overhead ground wire of high-voltage overhead power transmission line by means of suspending of PPR pipes |
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| CN105155908A (en) * | 2015-08-31 | 2015-12-16 | 国核电力规划设计研究院 | Heavy icing area alternating current strain tower in shape like Chinese character 'gan' |
| CN205445086U (en) * | 2016-03-26 | 2016-08-10 | 安徽瑞能电力工程设计有限公司 | It changes novel steel pipe pole of T to be applicable to cross link |
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| CN213115749U (en) * | 2020-08-21 | 2021-05-04 | 四川电力设计咨询有限责任公司 | Single-loop power transmission iron tower with front side and rear side different call heights |
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| CN212957927U (en) * | 2020-07-10 | 2021-04-13 | 四川电力设计咨询有限责任公司 | Same-tower double-circuit overhead transmission line drilling tower |
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