CN117013440A

CN117013440A - Construction method for overhead laying of large-span high-voltage cable

Info

Publication number: CN117013440A
Application number: CN202311076466.5A
Authority: CN
Inventors: 丁昆; 蒋革; 欧阳林; 戴乐; 刘晓鹏
Original assignee: Nanjing Shengzhihua Energy Technology Co ltd
Current assignee: Nanjing Shengzhihua Energy Technology Co ltd
Priority date: 2023-08-24
Filing date: 2023-08-24
Publication date: 2023-11-07

Abstract

The application relates to a construction method for overhead laying of a large-span high-voltage cable, which belongs to the technical field of overhead laying of cables and comprises the following steps: s1, positioning and installing a cable drum; s2, connecting a cable end of the cable drum with an elevating moving device; s3, opening one side of the rotating seat of the roller, which faces the lifting moving device; s4, the lifting moving device drives the cable to sequentially pass through the rollers on the towers; s5, temporarily grounding the front end and the tail end of the cable; s6, the ground wire is tightly connected and accessories are installed. The application has the effect of high installation efficiency of overhead cable laying.

Description

Construction method for overhead laying of large-span high-voltage cable

Technical Field

The application relates to the technical field of aerial cable laying, in particular to a construction method for aerial cable laying of a large-span high-voltage cable.

Background

The overhead line mainly refers to an overhead open line, is erected above the ground, and is a power transmission line for transmitting electric energy by fixing a power transmission wire on a tower erected on the ground by using an insulator. The power transmission corridor is convenient to erect and maintain, has low cost, is easily affected by weather and environment (such as strong wind, lightning stroke, pollution, ice and snow and the like) to cause faults, occupies more land area, and is easy to cause electromagnetic interference to surrounding environment.

The common overhead cable laying method is that a traction field and a tension field are arranged, a plurality of towers are positioned between the traction field and the tension field, the traction field comprises a traction machine and a traction rope, the tension field comprises a tension machine, constructors pass the traction rope through idler wheels arranged on the towers at present, then the traction rope and wires are connected through electric power fittings, the traction machine recovers the traction rope, the tension machine gradually releases the cable, and after the cable passes through all fixed idler wheels, the cable is arranged on an insulator and the idler wheels are removed, so that overhead cable laying is completed.

For the related technology, each time the cable overhead laying is carried out, the traction rope needs to pass through the rollers on all the towers, so that the laying efficiency is lower.

Disclosure of Invention

The application provides a construction method for overhead laying of a large-span high-voltage cable, which aims to improve the installation efficiency of overhead laying of the cable.

The construction method for overhead laying of the large-span high-voltage cable provided by the application adopts the following technical scheme:

a construction method for overhead laying of a large-span high-voltage cable comprises the following steps:

s1, positioning and installing a cable drum;

s2, connecting a cable end of the cable drum with an elevating moving device;

s3, opening an opening on one side of the rotating seat of the roller, which faces the lifting moving device;

s4, the lifting moving device drives the cable to sequentially pass through the rollers on the towers;

s5, temporarily grounding the front end and the tail end of the cable;

s6, the ground wire is tightly connected and accessories are installed.

By adopting the technical scheme, the overhead threading of the cable is directly driven by the overhead moving device, and the construction step of threading the guide rope is omitted, so that the installation efficiency of overhead laying of the cable is improved.

Optionally, in step S1, the cable reel is first set up with a support table before positioning, and the cable reel and the tensioner are mounted on the support table.

Through adopting above-mentioned technical scheme, cable drum and tensioner are all installed on the brace table, and cable drum winding cable is unreeled through the tensioner. The overhead cable drum can reduce the friction force of the cable to the roller on the tower pole, so that the wire can be pulled more smoothly.

Optionally, between the step S4 and the step S5, performing a step S4.1, replacing the cable drum and performing cable splicing;

the supporting table is provided with a clamping piece for temporarily fixing the tail end of the cable.

Through adopting above-mentioned technical scheme, make the cable laying of long span normally go on to the holder realizes fixing the cable end on the supporting bench, avoids appearing when changing the cable drum, and the cable end falls the inconvenient condition of lifting up the supporting seat with the cable end from the supporting bench after falling.

Optionally, add and hold the piece and include the bull stick, bull stick one end with the brace table rotates to be connected, the bull stick with the one end that the brace table rotated to be connected is provided with first grip block, first grip block is fixed on the brace table and with first grip block rotates to be connected, the one end that first grip block was kept away from to the bull stick is provided with the arm-tie, the arm-tie is kept away from one end of bull stick has been seted up the locating hole, be provided with the second grip block on the bull stick, the second grip block is located first grip block with between the arm-tie, the constant head tank has been seted up on the brace table, the constant head tank inserts and has had with the stopper of locating hole adaptation, the stopper passes when the locating hole is pegged graft in the spliced groove, first grip block with the second grip block presss from both sides tight cable end.

Through adopting above-mentioned technical scheme, when changing the cable drum, put the cable end between first grip block and second grip block, then pulling arm-tie to constant head tank department, first grip block and second grip block clamp cable end this moment, insert the stopper in the constant head tank restriction arm-tie removal afterwards to realize fixing the cable end on the brace table.

Optionally, the overhead moving device comprises a moving vehicle, an operation platform for the ascending operation of an electric worker is arranged on the moving vehicle, and a fixing clamp for clamping the front end of the cable is arranged on the operation platform.

Through adopting above-mentioned technical scheme, with anchor clamps centre gripping cable front end, the staff is at the laying condition of platform observation cable of ascending a height, and the locomotive drives the platform of ascending a height and removes, and anchor clamps drive cable removal lays, realizes passing the locomotive with the locomotive drive cable and passes the gyro wheel on a plurality of poles in proper order.

Optionally, the mounting fixture includes the mounting panel, the mounting panel is connected with the dead lever, the dead lever with operating platform connects, be provided with butt board and regulating plate on the mounting panel, regulating plate threaded connection has adjusting bolt, adjusting bolt rotates and is connected with the tight board of butt, the tight board of butt is located the regulating plate with between the butt board, the cable front end is located the butt board with between the butt board, the butt board with the butt board presss from both sides the cable front end.

Through adopting above-mentioned technical scheme, rotate adjusting bolt, make adjusting bolt drive to support tight board and remove and make to support tight board with the cable end tightly support on the board that supports, because the mounting panel passes through the dead lever and is connected with moving platform to time moving platform is when removing, and the mounting panel drives the cable front end and removes along with the locomotive together.

Optionally, the bottom of operation platform is provided with the connecting plate, the connecting plate is connected with the stiffening rod, the stiffening rod is connected with the dead lever, the stiffening rod towards the direction downward sloping of locomotive sets up.

Through adopting above-mentioned technical scheme, because cable mass is heavier, when the cable end is fixed on the mounting panel, the dead lever of encorbelmenting is crooked deformation easily, and the rigid structure of dead lever has been strengthened to the reinforcing rod, and then reduces the condition that the dead lever appears warping.

Optionally, between step S2 and step S3, step S2.1 is performed to install a rail and position the moving route of the overhead moving apparatus.

Through adopting above-mentioned technical scheme, the track sets up according to the position of tower pole, and the track makes overhead travelling device walk according to the prescribed route, avoids the off normal circumstances that leads to the cable to drop from the gyro wheel.

Optionally, the track includes two guided ways, one side that the guided way deviates from mutually is provided with the locating plate, the locating plate wears to be equipped with the stock, the stock anchors ground, the spliced groove has been seted up to guide rail one end, the guide rail other end is provided with the grafting piece, the grafting piece is pegged graft in adjacent the spliced groove of guide rail, the overhead moving device is followed the guided way removes.

Through adopting above-mentioned technical scheme, the locomotive removes under the removal of guided way, after the locomotive passes through the guided way, can demolish the guided way, then transport the guided way to the tower pole department that does not erect the electric wire and carry out the concatenation of guided way to can realize that the locomotive is going on simultaneously with the guide rail is laid in the removal threading, save the material that the guide rail was laid and improve threading efficiency.

Optionally, be provided with the extension rod on the overhead travelling device, the both ends of extension rod all are provided with the leading wheel, the guided way is shape track, two the opening direction of guided way sets up relatively, the leading wheel is located the homonymy the guided way.

Through adopting above-mentioned technical scheme, the locomotive is located between two guide rails, and the distance between two guide rails has been widened in the setting of extension rod, reduces when the locomotive appears shifting with the guide rail friction lead to locomotive and guide rail to appear wearing and tearing the condition.

In summary, the present application includes at least one of the following beneficial technical effects:

1. the overhead threading device has the advantages that the overhead moving device directly drives the cable to carry out overhead threading, the construction step of threading by the guide rope is omitted, and therefore the installation efficiency of overhead laying of the cable is improved;

2. the moving vehicle moves under the movement of the guide rail, after the moving vehicle passes through the guide rail, the guide rail can be removed, and then the guide rail is transferred to a tower pole where no electric wire is erected for splicing the guide rail, so that the moving vehicle can perform moving threading and guide rail laying simultaneously, the guide rail laying materials are saved, and the threading efficiency is improved;

3. when changing the cable drum, put the cable end between first grip block and second grip block, then pull the arm-tie to constant head tank department, first grip block and second grip block clamp cable end this moment, insert the stopper and restrict the arm-tie removal in the constant head tank afterwards to realize fixing the cable end on the brace table.

Drawings

Fig. 1 is a schematic overall structure of an embodiment of the present application.

Fig. 2 is an enlarged schematic view of the portion a in fig. 1.

Fig. 3 is an enlarged schematic view of a portion B in fig. 1.

Fig. 4 is an enlarged schematic view of a portion C in fig. 1.

Fig. 5 is a schematic structural view of an embodiment of the present application for embodying an overhead traveling apparatus.

Fig. 6 is a schematic diagram of a track structure embodying an embodiment of the present application.

Fig. 7 is an enlarged schematic view of a portion D in fig. 6.

Fig. 8 is a schematic structural diagram of a positioning slot according to an embodiment of the present application.

Fig. 9 is an enlarged schematic view of the portion E in fig. 8.

Reference numerals illustrate: 1. a support table; 11. a positioning groove; 12. a limiting block; 2. an elevating moving device; 21. a moving vehicle; 22. an operating platform; 23. an extension rod; 24. a guide wheel; 3. a fixing clamp; 31. a mounting plate; 32. an abutting plate; 33. an adjusting plate; 34. a pressing plate; 35. an adjusting bolt; 36. a fixed rod; 37. a connecting plate; 38. a reinforcing rod; 4. a track; 41. a guide rail; 42. a positioning plate; 43. a bolt; 44. a plug-in groove; 45. a plug block; 5. a clamping member; 51. a rotating rod; 52. pulling a plate; 521. positioning holes; 53. a first clamping plate; 54. and a second clamping plate.

Detailed Description

The application is described in further detail below with reference to fig. 1-9.

The embodiment of the application discloses a construction method for overhead laying of a large-span high-voltage cable.

The construction method for overhead laying of the large-span high-voltage cable comprises the following steps:

s1, positioning and installing cable drum

As shown in fig. 1, a supporting table 1 is positioned and erected at the starting point of cable laying, cable reels are arranged in a high position, and the supporting table 1 can be erected as a supporting table 1 by a temporary scaffold according to the height of a tower pole, and can also be a lifting platform. The cable drum and the tensioner are both arranged on the supporting table 1, and the cable wound on the cable drum is unreeled through the tensioner. The overhead cable drum can reduce the friction force of the cable to the roller on the tower pole, so that the wire can be pulled more smoothly.

S2, connecting a cable end of the cable drum with the lifting mobile device 2;

as shown in fig. 1 and 2, the elevating moving apparatus 2 includes a moving vehicle 21, and the moving vehicle 21 may be selected according to the tower height, for example: straight arm type aerial work platform mobile vehicle (applicable to 20-58 meters), scissor type aerial work platform mobile vehicle (applicable to 3-22 meters), crank arm type aerial work platform mobile vehicle (applicable to 10-45 meters) or mast type aerial work platform mobile vehicle (applicable to 3-14 meters). The embodiment of the application adopts a straight arm type aerial work platform mobile vehicle, an operation platform 22 for the ascending operation of a power supply worker is arranged on the mobile vehicle 21, and a fixing clamp 3 for fixing the cable end head with the mobile vehicle 21 is arranged on the operation platform 22.

The fixing clamp 3 comprises a mounting plate 31, an abutting plate 32 and an adjusting plate 33 are arranged on the mounting plate 31, an abutting plate 34 is arranged on the adjusting plate 33, an adjusting bolt 35 is connected with the adjusting plate 33 in a threaded mode, the adjusting bolt 35 is rotationally connected with the abutting plate 34, a cable end is placed on the mounting plate 31, the cable end is located between the abutting plate 32 and the abutting plate 34, and the adjusting bolt 35 is rotated to enable the adjusting bolt 35 to drive the abutting plate 34 to move and enable the abutting plate 34 to tightly abut the cable end on the abutting plate 32. The mounting plate 31 is connected with a fixing rod 36, and the fixing rod 36 is connected with the operation platform 22.

The bottom of operation platform 22 is provided with connecting plate 37, and connecting plate 37 bolted connection has stiffener 38, and stiffener 38 one end is connected with the bottom of connecting plate 37, and the one end that stiffener 38 kept away from connecting plate 37 is connected with dead lever 36 bolted connection, and stiffener 38 is towards the direction downward sloping of locomotive 21 setting.

One end of the moving vehicle 21 far away from the tower pole is provided with a plurality of balancing weights, so that the situation that the moving vehicle 21 overturns during threading due to large weight of a wire is avoided.

S2.1, installing a track 4, and positioning a moving route of the moving device;

as shown in fig. 3, when the track 4 is installed, the distance between the moving vehicle 21 and the tower is calculated according to the distance between the roller and the tower and the length of the fixed rod 36, when the moving vehicle 21 passes through the roller with the cable end, then a mark point is made on the ground according to the calculated distance between the moving vehicle 21 and the tower, and the distance between the mark point and the tower is the distance between the moving vehicle 21 and the tower. The reinforcing bar head is inserted on the mark point and then the stay wire is pulled, and the track 4 is paved along the direction of the stay wire.

As shown in fig. 3, 5 and 7, the track 4 comprises two guide rails 41, the position of the moving vehicle 21 is between the two guide rails 41, the guide rails 41 are -shaped, the bottom of the moving vehicle 21 is provided with an extension rod 23, the extension rod 23 is a T-shaped rod, two ends of the extension rod 23 are both rotationally connected with guide wheels 24, and the guide wheels 24 are positioned in the guide rails 41 on the same side. The two sides that two guide rails 41 deviate from each other are all provided with locating plate 42, and locating plate 42 wears to be equipped with stock 43, and stock 43 one end inserts ground. The guide rail 41 has one end provided with a plug groove 44, the other end of the guide rail 41 is provided with a plug block 45, and the plug blocks 45 of adjacent guide rails 41 are inserted into adjacent plug holes.

After the moving vehicle 21 passes through the guide rail 41, the guide rail 41 can be removed, and then the guide rail 41 is transported to a tower pole where no electric wire is erected to splice the guide rail 41, so that the moving vehicle 21 can perform moving threading and guide rail laying simultaneously, guide rail laying materials are saved, and threading efficiency is improved.

S3, opening an opening on one side of the rotating seat of the roller, which faces the moving device;

the insulator is installed on the tower pole, and the insulator is connected with rotating the seat, and the gyro wheel rotates to be connected on rotating the seat, rotates the seat and is type seat, rotates the opening direction of seat and setups in the direction of deviating from the tower pole to make dead lever 36 can pass and rotate the seat and carry out the aerial laying of cable.

S4, the moving device drives the cable to sequentially pass through the rollers on the towers;

during the moving process of the mobile vehicle 21, the fixed rod 36 penetrates into the rotating seat, the mounting plate 31 is positioned in the rotating seat, the mobile vehicle 21 runs at a low speed, and the running speed is controlled between 10 km/h and 20 km/h. The moving carriage 21 moves along the guide rail, so that the cable is not separated from the pulley and is not separated from the rotating seat all the time when the moving carriage 21 performs the cable threading. The overhead threading of the cable is directly driven by the moving vehicle 21, the construction step of threading the guide rope is omitted, and the threading and the guide rail laying are synchronously carried out, so that the moving vehicle 21 does not need to pause to wait for the guide rail laying during the threading, and the construction efficiency of the overhead laying of the cable is improved as a whole.

Before the cable is threaded, a grounding pulley is required to be installed on the cable, so that damage to a human body caused by static electricity generated by friction during unreeling of a tensioner is avoided.

S4.1, replacing a cable drum and carrying out cable lap joint;

as shown in fig. 4, 8 and 9, a terminal clamping piece 5 for temporarily fixing a cable is arranged on the supporting table 1, the clamping piece 5 comprises two rotating rods 51, the two rotating rods 51 are all of an L shape and are parallel to each other, the two rotating rods 51 are connected with a pulling plate 52 in a rotating mode, the pulling plate 52 is located at one end of the rotating rod 51, a first clamping plate 53 is arranged at one end, far away from the rotating rod 51, of the pulling plate 52, and the first clamping plate 53 is fixedly connected with the supporting table 1 and is connected with the two rotating rods 51 in a rotating mode. The first clamping plate 53 is located at an end of the rotating rod 51 remote from the pulling plate 52. The two rotating rods 51 are fixedly connected with a second clamping plate 54, the second clamping plate 54 is located between the first clamping plate 53 and the pulling plate 52, and the opposite side surfaces of the first clamping plate 53 and the second clamping plate 54 are rough surfaces.

The locating hole 521 has been seted up to the one end that the arm-tie 52 was kept away from bull stick 51, has seted up constant head tank 11 on the brace table 1, has peg graft stopper 12 in the constant head tank 11, stopper 12 and locating hole 521 adaptation.

When the cable drum is replaced, the cable tail end is placed between the first clamping plate 53 and the second clamping plate 54, then the pulling plate 52 is pulled to the positioning groove 11, at the moment, the first clamping plate 53 and the second clamping plate 54 clamp the cable tail end, and then the limiting block 12 is inserted into the positioning groove 11 to limit the pulling plate 52 to move, so that the cable tail end is fixed on the supporting table 1, and the situation that the cable tail end is inconvenient to lift to the supporting table 1 after falling from the supporting table 1 when the cable drum is replaced is avoided.

S5, temporarily grounding the front end and the tail end of the cable;

s6, mounting the ground wire tightening wire and the accessories;

and measuring the distance between the supporting structures according to the length and the position of the required ground wire, planning the installation positions of the insulators and the supporting structures, and installing the insulators on the planned supporting structures so as to support the ground wire. Ensuring the insulator is stable and properly insulated, connecting the earth wire to the support structure or insulator using connectors, and gradually tightening the earth wire using wire clamps and wire rope pulleys. Ensuring that the conductive wires maintain proper tension between the support structures and avoid over tightening. The ground lead is secured to the support structure using a bolt wrench and wrench set. The moderate fastening force is ensured so as to keep the position of the ground wire stable. And a grounding device, a lightning rod and other grounding accessories are arranged on the grounding wire.

The implementation principle of the embodiment of the application is as follows: the friction between the cable and the rollers is reduced when the cable is pulled by the cable coil, then the cable end is connected with the fixed clamp 3, the moving trolley moves along the track 4 to drive the cable to sequentially pass through the rollers of a plurality of towers, after the moving trolley 21 passes through the guide rail 41, the guide rail 41 can be removed, then the guide rail 41 is transferred to the tower where the wires are not erected to splice the guide rail 41, and finally the ground lead is tightly connected with accessories, so that overhead laying of the wires is completed, the moving trolley 21 can simultaneously carry out moving threading and track 4 laying, the material laid by the track 4 is saved, and the threading efficiency is improved.

The above embodiments are not intended to limit the scope of the present application, so: all equivalent changes in structure, shape and principle of the application should be covered in the scope of protection of the application.

Claims

1. A construction method for overhead laying of a large-span high-voltage cable is characterized by comprising the following steps: the method comprises the following steps:

s1, positioning and installing a cable drum;

s2, connecting a cable end of the cable drum with the lifting moving device (2);

s3, opening one side of the rotating seat of the roller, which faces the lifting moving device (2);

s4, the lifting moving device (2) drives the cable to sequentially pass through the rollers on the towers;

s5, temporarily grounding the front end and the tail end of the cable;

s6, the ground wire is tightly connected and accessories are installed.

2. The construction method for aerial laying of large-span high-voltage cables according to claim 1, characterized in that: in step S1, a supporting table (1) is erected before the cable drum is positioned, and the cable drum and the tensioner are installed on the supporting table (1).

3. The construction method for aerial laying of large-span high-voltage cables according to claim 2, characterized in that: step S4.1 is carried out between the step S4 and the step S5, the cable coil is replaced, and the cable is lapped;

the supporting table (1) is provided with a clamping piece (5) for temporarily fixing the tail end of the cable.

4. A construction method for aerial laying of a large-span high-voltage cable according to claim 3, wherein: the clamping piece (5) comprises a rotating rod (51), one end of the rotating rod (51) is rotationally connected with the supporting table (1), a first clamping plate (53) is arranged at one end of the rotating rod (51) which is rotationally connected with the supporting table (1), the first clamping plate (53) is fixed on the supporting table (1) and rotationally connected with the first clamping plate (53), a pulling plate (52) is arranged at one end, far away from the first clamping plate (53), of the rotating rod (51), a locating hole (521) is formed in one end, far away from the rotating rod (51), of the pulling plate (52), a second clamping plate (54) is arranged on the rotating rod (51), the second clamping plate (54) is located between the first clamping plate (53) and the pulling plate (52), a locating groove (11) is formed in the supporting table (1), a limiting block (12) which is matched with the locating hole (521) is inserted into the locating groove (11), and the limiting block (12) penetrates through the locating hole (521) to clamp the first clamping plate (53) and the second clamping plate (53).

5. The construction method for aerial laying of large-span high-voltage cables according to claim 1, characterized in that: the lifting mobile device (2) comprises a mobile vehicle (21), an operation platform (22) for the climbing operation of an electric worker is arranged on the mobile vehicle (21), and a fixing clamp (3) for clamping the front end of a cable is arranged on the operation platform (22).

6. The construction method for aerial laying of the large-span high-voltage cable according to claim 5, wherein: the fixing clamp (3) comprises a mounting plate (31), the mounting plate (31) is connected with a fixing rod (36), the fixing rod (36) is connected with an operation platform (22), an abutting plate (32) and an adjusting plate (33) are arranged on the mounting plate (31), the adjusting plate (33) is in threaded connection with an adjusting bolt (35), the adjusting bolt (35) is rotationally connected with an abutting plate (34), the abutting plate (34) is located between the adjusting plate (33) and the abutting plate (32), a front end of a cable is located between the abutting plate (34) and the abutting plate (32), and the abutting plate (32) and the front end of the cable is clamped by the abutting plate (34).

7. The construction method for aerial laying of large-span high-voltage cables according to claim 6, characterized in that: the bottom of operation platform (22) is provided with connecting plate (37), connecting plate (37) are connected with stiffening rod (38), stiffening rod (38) are connected with dead lever (36), stiffening rod (38) towards the direction downward sloping of locomotive (21) sets up.

8. The construction method for aerial laying of large-span high-voltage cables according to claim 1, characterized in that: between step S2 and step S3, step S2.1 is performed to install the rail (4) and position the moving route of the overhead moving apparatus (2).

9. The construction method for aerial laying of large-span high-voltage cables according to claim 8, characterized in that: the track (4) comprises two guide rails (41), one side, away from each other, of each guide rail (41) is provided with a locating plate (42), an anchor rod (43) is arranged in a penetrating mode through the locating plates (42), the anchor rods (43) are anchored into the ground, an inserting groove (44) is formed in one end of each guide rail, an inserting block (45) is arranged at the other end of each guide rail (41), the inserting blocks (45) are inserted into the inserting grooves (44) of the adjacent guide rails, and the lifting moving device (2) moves along the guide rails (41).

10. The construction method for aerial laying of large-span high-voltage cables according to claim 9, characterized in that: the lifting moving device is characterized in that an extension rod (23) is arranged on the lifting moving device (2), guide wheels (24) are arranged at two ends of the extension rod (23), each guide rail (41) is a -shaped rail (4), the opening directions of the two guide rails (41) are opposite, and the guide wheels (24) are located in the guide rails (41) on the same side.