Construction method of wire across river

Abstract

The present application relates to a kind of wire river crossing stringing construction methods, comprising the following steps: completing the water in the tower assembly work, and the tower is hung with pay-off pulley assembly;Through unmanned aerial vehicle, guide rope is laid out, first steel wire rope is pulled to the opposite bank of river by guide rope, and both ends of first steel wire rope are anchored to ground by anchoring rope;Lay out wire, first use unmanned aerial vehicle to lay out guide rope, guide rope is connected together with wire, then cooperate with pay-off pulley assembly to pull wire;After wire is in place, clamp is used to fix wire in place on first steel wire rope;Walking basket is set on first steel wire rope, personnel is moved to walking basket in the tower nearby, and walking basket is moved to the jointing point of two adjacent wires to joint the end of two wires;From the selection of pulley, the technology of jointing and the method of construction, three dimensions are discussed, a kind of technology without jointing pipe over pulley is discussed, the safety of construction is guaranteed, and the quality of construction is improved.

Description

Technical Field

[0001] The invention relates to a method for constructing a conductor stringing across a river, belonging to the technical field of power transmission lines. Background Art

[0002] ACCC (aluminum composite carbon core) conductor, also known as carbon fiber conductor, is a new type of conductor featuring strong tensile strength, high transmission capacity, light weight, low loss, low sag, high-temperature resistance, energy conservation, and environmental protection. It offers significant advantages over traditional steel-core aluminum stranded wire in terms of mechanical, thermal, and electrical properties. ACCC conductor has low bending strength, so during the stringing process, the payout pulley becomes a critical quality control point to prevent excessive bending and subsequent breakage of the composite core rod.

[0003] For example, a Chinese patent published on August 2, 2022, with patent publication number CN114843939A, discloses a carbon fiber conductor stringing construction method. This method protects the carbon fiber conductor during payout, storage, and stringing, as well as by arranging a tensioner along the line direction, to prevent the carbon fiber conductor from bending.

[0004] However, when crossing extremely long rivers (over 3.6 km), the conductors must be spliced, as the current maximum conductor reel length is 3.6 km. Since the conductor splices cannot be directly passed through the payout pulley, special construction methods are required to ensure payout quality. Summary of the Invention

[0005] The object of the present invention is to provide a method for constructing a wire across a river to solve the problems raised in the above-mentioned background technology.

[0006] The technical solutions of the present invention are as follows:

[0007] A method for constructing a wire across a river comprises the following steps:

[0008] The underwater assembly of the tower is completed, and the pay-out pulley assembly is hung on the tower;

[0009] A guide rope is deployed by a drone, and the guide rope pulls the first steel wire rope to the other side of the river, and both ends of the first steel wire rope are anchored to the ground by anchor ropes;

[0010] To deploy the conductor, first use the drone to deploy the guide rope, which is connected to the conductor, and then cooperates with the pay-out pulley assembly to pull the conductor;

[0011] After the conductor is in place, a clamp is used to fix the conductor in place on the first wire rope;

[0012] A walking basket is set on the first wire rope, and personnel move to the walking basket from the nearest tower. The walking basket moves to the connection point of two adjacent conductors to connect the ends of the two conductors.

[0013] Preferably, the pay-off pulley assembly includes a support iron and at least two groups of pulleys installed in a line and in parallel on the support iron.

[0014] Preferably, the diameter of the pulley is more than 20 times the diameter of the wire.

[0015] Preferably, the ends of the two wires are connected via a core connecting assembly.

[0016] Preferably, the core connection assembly includes a wedge-shaped clamp seat, a wedge-shaped clamp and a connector. The wedge-shaped clamp seat and the wedge-shaped clamp cooperate to clamp and fix the end of the wire. The two wedge-shaped clamp seats are connected into one by the connector.

[0017] Preferably, after the wedge-shaped clamp seat and the wedge-shaped clamp cooperate to clamp the carbon core of the conductor, the carbon core is exposed by more than 50 mm.

[0018] Preferably, the core connection assembly further comprises an external compression tube, both ends of which are respectively crimped onto the ends of two adjacent wires.

[0019] Preferably, when laying out the conductor, the guide rope is connected to the second steel wire rope, and then the second steel wire rope is pulled by the strand, and then the second steel wire rope and the conductor are connected together through the walking board.

[0020] Preferably, the outermost conductor has one end fixed to the shore via a third steel wire rope.

[0021] Preferably, the wire is a carbon fiber wire.

[0022] The present invention has the following beneficial effects:

[0023] ACCC is widely used in power transmission lines worldwide, particularly in Southeast Asia and South Asia, where well-developed river systems and wide river spans are common, often using ACCC conductors for these crossings. This patent proposes a method for constructing ultra-long tension sections across rivers suitable for ACCC conductors. By considering pulley selection, splicing techniques, and construction methods, this patent explores a process that eliminates the need to pass splicing tubes through pulleys, ensuring construction safety and improving quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a process flow chart of the present invention;

[0025] Figure 2 This is a schematic diagram of the existing pay-off pulley assembly and the conductor;

[0026] Figure 3 This is a schematic diagram of the improved pay-off pulley assembly and the conductor in cooperation with the present invention;

[0027] Figure 4 Schematic diagram of the pay-off pulley assembly of the present invention;

[0028] Figure 5 Schematic diagram of the cooperation between the wedge-shaped clamp seat, the wedge-shaped clamp and the carbon core of the conductor of the present invention;

[0029] Figure 6 This is a schematic diagram of the present invention after two wires are crimped and connected to the external pressure pipe;

[0030] Figure 7 This is a schematic diagram of step 1 of an embodiment of the present invention;

[0031] Figure 8 This is a schematic diagram of step 2 of an embodiment of the present invention;

[0032] Figure 9 This is a schematic diagram of step three of an embodiment of the present invention;

[0033] Figure 10 This is a schematic diagram of step 4 of an embodiment of the present invention;

[0034] Figure 11 Schematic diagram of the wedge clamp of the present invention.

[0035] 12. Anchor rope; 13. Conductor; 14. First wire rope; 15. Second wire rope; 16. Board; 17. Third wire rope; 18. Clamp; 20. Pole tower; 21. Traveling basket;

[0036] 100. Pay-off pulley assembly; 1. Pulley; 3. Tower crossarm; 4. Support iron; 6. Marking;

[0037] 7. Carbon core; 8. Wedge-shaped clamp seat; 9. Wedge-shaped clamp; 10. Connector; 11. External pressure pipe. DETAILED DESCRIPTION

[0038] The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Example: Figure 1-11 As shown:

[0040] The conductor 13 is an ACCC conductor (carbon fiber conductor).

[0041] like Figure 2 As shown, the existing pay-off pulley assembly 100 is a single pulley; Figure 3As shown, the improved pay-out pulley assembly 100 is a double pulley. The envelope angle of the conductor 13 refers to the central angle of the conductor 13 corresponding to the envelope interval of the pulley 1. In other words, during the transmission line stringing construction, when the conductor 13 is in the pulley 1 and in contact with the pulley 1, the angle between the two tangent points of the conductor 13 and the center of the pulley 1 is the angle between the conductor 13 and the pulley 1.

[0042] The envelope angle of the payout pulley assembly 100 directly affects the bending of the conductor 13. Therefore, reducing the envelope angle is an effective measure to prevent damage and breakage of the carbon fiber conductor core rod. Different conductor types require payout pulley assemblies 100 of varying sizes. Based on the performance of ACCC conductors, the diameter of the pulley 1 in the payout pulley assembly 100 must be at least 20 times the diameter of the conductor 13.

[0043] like Figure 4 As shown, taking into account the particularity of the ACCC conductor, a double pulley is used to reduce the envelope angle. The double pulley pay-off pulley assembly 100 comprises: a pulley 1, a tower crossarm 3 and a support iron 4. The tower crossarm 3 and the support iron 4 are relatively fixed and connected as a whole. The tower crossarm 3 is fixed on the tower 20 as a supporting member of the pulley 1. The main function of the support iron 4 is to ensure the synchronous displacement of the two groups of pulleys 1.

[0044] ACCC wire crimping process:

[0045] The crimping process of carbon fiber composite core conductors is significantly different from that of steel core aluminum stranded wires commonly used in previous transmission line projects.

[0046] (1) Wire stripping:

[0047] When the carbon fiber composite core conductor is crimped and broken, it is not allowed to use cutters such as wire cutters. Use a bench saw and cut in a circular motion. That is, use a rotary saw. Stop sawing when only 1 / 2 of the inner aluminum strand is left, and then break it manually.

[0048] When sawing off the core rod, a pre-breaking point should be set 200mm before the formal breaking point. In order to prevent the core rod skin of the conductor 13 from cracking, it is necessary to rotate and cut a circular ring with a depth of not less than 0.5mm at the imprint. When the core rod is about to be sawed through, the saw should be moved lightly to prevent the outer layer of the core rod from splitting; and the oil stains on the composite core should be wiped off with a dry cloth, and the composite core should be gently polished with special fine sandpaper, and then the powder should be wiped off with a dry cloth.

[0049] (2) Core connection components such as Figure 5 As shown:

[0050] The first step is to insert the carbon core 7 of the conductor 13 into the wedge clamp seat 8, and then insert the carbon core 7 into the wedge clamp 9 and clamp the carbon core 7. The wedge clamp 9 slides into the wedge clamp seat 8 as a whole, ensuring that the carbon core 7 is exposed 50mm from the edge of the wedge clamp 9. Then the wedge clamp seat 8 is moved backward with force to lock the wedge clamp 9. After locking, ensure that the carbon core 7 is still exposed 50mm. At this time, Figure 5 shown.

[0051] The second step is to screw the connector 10 into the wedge-shaped clamp seat 8 and tighten it with a wrench.

[0052] The third step is to tighten the connector 10 and the wedge clamp seat 8. Check that there should be about 30mm of carbon core 7 exposed near the end of the wire 13, and the tapered end of the wedge clamp 9 should be pulled out 5mm from the end of the wedge clamp seat 8. The installation process at the other end is exactly the same. Finally, use two wrenches to tighten the connector 10 synchronously. Figure 6 shown.

[0053] (3) External aluminum tube crimping:

[0054] When crimping the external compression tube 11 of the carbon fiber composite core conductor, apply a release agent to the tube 11 to facilitate smooth demolding after crimping. Install the external compression tube 11 according to the pre-marked markings, then apply pressure at the center mark. Push the inner liner into the external compression tube 11. Starting 8 mm from the marked lines at both ends of the external compression tube 11, apply pressure in sequence toward the end of the tube 11 (the end away from the connector 10). The overlap between the molds should be no less than 5 mm.

[0055] 5.3 Construction method of ACCC conductor with ultra-long span across river:

[0056] (1) Construction preparation: Complete the underwater assembly of the tower 20, check that the anchor bolts and tower bolts are tightened and meet the design tightening torque and anti-loosening and anti-disassembly requirements. It is strictly forbidden to carry out line construction when the anchor nuts are not tightened in place.

[0057] (2) A pay-out pulley assembly 100 is hung on each group of towers 20, and is deployed to a guide rope by a drone. The guide rope pulls the first steel wire rope 14 to the other side of the river, and both ends of the first steel wire rope 14 are anchored to the ground through corresponding anchor ropes 12; Figure 7 shown.

[0058] (3) Before laying out conductor 13, a sampling test should be carried out to confirm that the diameter, surface condition, pitch-diameter ratio and lay direction of the ground wire meet the requirements of relevant specifications.

[0059] (4) Deploy the first conductor section 13. First, use the drone to deploy a guide rope, which is connected to one strand of the second steel wire rope 15. Then, the guide rope is used to pull two strands of the second steel wire rope 15. Then, the second steel wire rope 15 and the first conductor section 13 are connected together using the walking board 16, and then the first conductor section 13 is pulled.

[0060] (5) After the first section of the conductor 13 is in place, the right end of the first section of the conductor 13 is fixed to the shore using the third wire rope 17, and the first section of the conductor 13 is fixed to the wire rope 14 using the clamp 18. After the fixing is completed, repeat the (4) process and continue to pull the second section of the conductor 13; Figure 8 shown.

[0061] (6) After the second section of conductor 13 is in place, the second section of conductor 13 is fixed to the wire rope 14 using the clamp 18. The walking basket 21 is lifted, and the support point of the walking basket 21 is on the first wire rope 14. Then, personnel go up to the walking basket 21 on the nearest tower 20, and use the walking propulsion device of the walking basket 21 to reach the connection point of the two adjacent sections of ACCC conductors, and connect the two sections of conductor 13; Figure 9 shown.

[0062] (7) After the connection is completed, lower the walking basket 21 and transport it to another section of the connection room for preparation. Continue to pull the third section of the conductor 22. After the third section of the conductor 13 is in place, use the clamp 18 to fix the conductor section on the wire rope 14. Lift the walking basket 21, the support point of the walking basket 21 is on the wire rope 14, and then the personnel climb up the basket on the nearest tower cross arm, and reach the connection point of the ACCC conductor through the walking propulsion device to connect the two sections of the conductor, such as Figure 10 shown.

[0063] (8) At the same time, the middle and upper conductors should be deployed according to steps 3-7. After the conductors are deployed, they should be tightened in time. The interphase sub-conductors should be tightened at the same time. After the sag meets the standard, the process should be repeated step by step.

[0064] (9) Crimp the ends and secure them to the pole tower 20.

[0065] The structure of wedge-shaped clamp 9 is as follows Figure 11 As shown, torque is applied to compress the clamp, thereby achieving conductor wrapping force. The wedge-shaped supports (8) cooperate with the wedge-shaped clamp (9) to limit and secure the clamp during conductor tensioning. The connector (10) is a double-threaded connection device that connects the eight wedge-shaped supports to each other, ensuring they can withstand axial loads.

[0066] The clamp 18 is a conventional metal fixture for fixing the conductors. The track 16 is a device that connects the conductors and the traction wires during the stringing process. It is currently a conventional construction tool. For example, Chinese patent publication number CN218603044U discloses a traction track for deploying ultra-high voltage transmission lines.

[0067] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention's description and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for constructing a wire across a river, characterized in that: The following steps are involved: The underwater assembly of the pole tower (20) is completed, and a line-releasing pulley assembly (100) is hung on the pole tower (20); A guide rope is deployed by a drone, the guide rope pulls the first steel wire rope (14) to the other side of the river, and both ends of the first steel wire rope (14) are anchored to the ground by an anchor rope (12); Deploying the conductor (13), first deploying a guide rope using a drone, connecting the guide rope to the conductor (13), and then cooperating with a pay-out pulley assembly (100) to pull the conductor (13); After the conductor (13) is in place, the clamp (18) is used to fix the conductor (13) in place on the first steel wire rope (14); A walking hanging basket (21) is arranged on the first steel wire rope (14), and a person moves to the walking hanging basket (21) from the nearest pole tower (20), and the walking hanging basket (21) moves to the connection point of two adjacent conductors (13) to connect the ends of the two sections of conductors (13); The pay-off pulley assembly (100) comprises a support iron (4) and at least two groups of pulleys (1) mounted in a line and in parallel on the support iron (4).

2. A method for stringing a conductor across a river as claimed in claim 1, characterized in that: The diameter of the pulley (1) is more than 20 times the diameter of the wire (13).

3. A method for stringing a conductor across a river as claimed in claim 1, characterized in that: The ends of two sections of wire (13) are connected via a core connecting assembly.

4. A method for stringing a conductor across a river as claimed in claim 3, characterized in that: The core connection assembly comprises a wedge-shaped clamp seat (8), a wedge-shaped clamp (9) and a connector (10). The wedge-shaped clamp seat (8) and the wedge-shaped clamp (9) cooperate to clamp and fix the end of the wire (13). The two wedge-shaped clamp seats (8) are connected into one body via the connector (10).

5. A method for stringing a conductor across a river as claimed in claim 4, characterized in that: After the wedge-shaped clamp seat (8) and the wedge-shaped clamp (9) cooperate to clamp the carbon core (7) of the conductor (13), the carbon core (7) is exposed for more than 50 mm.

6. A method for stringing a conductor across a river as claimed in claim 4, characterized in that: The core connection assembly further comprises an external compression tube (11), both ends of the external compression tube (11) being respectively compressed onto the ends of two adjacent wires (13).

7. A method for stringing a conductor across a river as claimed in claim 1, characterized in that: When the conductor (13) is deployed, the guide rope is connected to one strand of the second steel wire rope (15), and then two strands of the second steel wire rope (15) are pulled by one strand, and then the second steel wire rope (15) and the conductor (13) are connected together through the walking board (16).

8. A method for stringing a conductor across a river as claimed in claim 1, characterized in that: The outermost conductor (13) is fixed to the shore at one end by a third steel wire rope (17).

9. A method for stringing a conductor across a river as claimed in claim 1, characterized in that: The wire (13) is a carbon fiber wire.

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