Connecting fittings for prefabricated camless construction method and wire extension and fastening method using same

Abstract

To provide a coupling metal fitting for a prefabricated camless method that can reduce a stress applied during extension and tightening of a power transmission wire, can be repeatedly used, and leads to an improvement in workability, and a wire extending and wire tightening method using the same.SOLUTION: A coupling metal fitting for a prefabricated camless method is composed of a camless metal fitting, a tool for wire extension, and a tool for wire tightening. The camless metal fitting is composed of two or three camless metal fittings including a first camless metal fitting and a second camless metal fitting coupled to each other. The first camless metal fitting is coupled to an end of a compression clamp at one end in a longitudinal direction via a first coupling shaft. The second camless metal fitting is coupled to the tool for wire extension at the other end in the longitudinal direction via a third coupling shaft. The tool for wire extension is coupled to an end of a wire connector at the other end in the longitudinal direction via a fourth coupling shaft. The tool for wire tightening is coupled to the first camless metal fitting via a tool for wire tightening attachment part.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to connecting fittings for prefabricated kamaress construction method and a wire extension and fastening method using the same, and more specifically, to connecting fittings for prefabricated kamaress construction method which reduce the bending stress applied to the connecting fittings for the prefabricated kamaress construction method when extending and fastening power lines by reducing the number of parts and making them lighter, and which can be used repeatedly by preventing deformation, etc., and which can improve the workability and shorten the work time for extending and fastening wires, and a wire extension and fastening method using the same.

[0002] In this specification, "extension" refers to the work of stringing the power line by passing it through a cart attached to the tower and stretching it with a winch over a 2 to 4 km section between transmission line towers (hereinafter referred to as towers), and "tightening" refers to the work of adjusting the slack (sag) of the extended power line to a level determined in advance by design. [Background technology]

[0003] FIG. 9 is an explanatory diagram showing the operation of extending a power transmission line using a conventional prefabricated camless construction method. On the ground, the end of the power transmission line (L) is pressed into a compression-type retention clamp (31), and a cam-alongless fitting (hereinafter referred to as a cam-along fitting (32)) is provided on the end of the compression-type retention clamp (31) on the attachment side of the power transmission line (L) and on the opposite end.

[0004] A fork-shaped member (hereinafter also referred to as a clevis portion) (32a) is provided at one end of the camless fitting (32), and is rotatably connected to the eye portion (31a) of the compression-type strain clamp (31). An eye portion (32b) is provided at the other end of the camless fitting (32), and is rotatably connected to a wire connector (33) of a wire (W) for drawing a line. An attachment portion (32c) having an attachment hole (32c') for attaching a wire fastening fitting when fastening the power transmission line (L) to a steel tower is formed between the clevis portion (32a) and the eye portion (32c).

[0005] In the conventional prefabricated kamaress construction method, the kamaress fittings (32) are not only attached to the tower via the insulator device during wiring and ultimately become a component part of the insulator device, but are also made of a high-strength material so as to be sufficiently resistant to the twisting that occurs when the transmission line (L) passes through the wire-drawing pulley (K1) when it is pulled by the wire-drawing wire, as shown in FIG. 9.

[0006] When the power line (L) moves on the wire-drawing iron car (K1), a pushing force is applied to the power line (L). However, since the power line (L) is a twisted wire, the orientation of the strands of the twisted wire is different from the direction of travel of the power line (L), so the strands are pried on the wheel surface and move. This phenomenon generates pulling resistance and causes the strands to stretch slightly. In addition, the weight of the wire and the pulling tension push the power line (L) against the wheel surface, causing nicking (scratches on the wire surface). The amount of nicking increases with the number of passes over the wire-drawing iron car (K1) and the pushing force on the iron car. This pushing force is proportional to the wire tension and inversely proportional to the diameter of the wire-drawing iron car (K1). In addition, the power line (L) may rotate when passing over the wire-drawing iron car (K1). Due to these physical phenomena, the power transmission line (L) elongates due to the movement of the wires, and also due to the untwisting or tightening caused by rotation, and further due to nicking, resulting in so-called permanent elongation.

[0007] Patent Document 1 discloses a kamaress fitting that has multiple oscillating block bodies (kamaress fittings) and multiple pivot shafts that pivotally connect the oscillating block bodies (kamaress fittings) to deal with deformation caused by tensile forces applied during wire drawing and tightening operations, with one end pivotally connected to the power transmission line side and the other end pivotally connected to the drawing wire side. In the case of the kamaress fitting of Patent Document 1, the intermediate oscillating block body (kamaress fitting) has a tool mounting portion to which a wire tightening tool is attached and an eye portion connected to the end of the tool mounting portion, and the oscillating block body (kamaress fitting) pivotally connected to the power transmission line side has a clevis portion pivotally connected to the eye portion of the oscillating block body (kamaress fitting). Therefore, when a tensile force acts on the intermediate swing block body (kamaress fitting) during wire-drawing work, the distance from the point of application of this tensile force to the clevis part becomes relatively short, which has the effect of preventing deformation of the eye part and the clevis part due to the tensile force applied during wire-drawing work and wire-tightening work. However, this approach has the disadvantage of requiring a large number of parts.

[0008] Patent Document 2 discloses a wiring method for wiring extended power transmission cables, as well as a connecting fitting and a connecting fitting unit including the connecting fitting for use in the wiring method. In Patent Document 2, three kamaress fittings are connected to a short clamp for use, but during extension and tightening of the wire, a large bending load is applied to the kamaress fittings due to the passing of the iron car and the oscillation and rotation of the power transmission line. Therefore, among the overhead line fittings, the kamaress fittings must be made of a special material that has the highest strength and is expensive, such as nickel-chrome steel, and furthermore, it is unavoidable to limit the tension and the iron car embrace angle during work. In addition, during cable replacement work, it was necessary to attach pads to the uneven areas of the camless fittings to allow the hanging wheels, which have a smaller diameter than the wire-drawing wheels, to pass through smoothly. Furthermore, with regard to the tensioning tool (parallel clevis link), even if the mounting part is precisely manufactured so that it fits tightly to the right-angle clevis link or right-angle link for attaching the tensioning tool to the kamares fitting, the bending load applied during tensioning is large, causing partial contact and concentrating stress on the contact points, resulting in problems such as deformation or damage to the kamares fitting and peeling of the surface plating. [Prior art documents] [Patent documents]

[0009] [Patent Document 1] JP 2003-169412 A [Patent Document 2] JP 2012-125093 A Summary of the Invention [Problem to be solved by the invention]

[0010] In order to solve the above-mentioned problems of the prior art, the present invention reduces the number of parts and the weight of the connecting fittings for the prefabricated kamaress construction method. The object of the present invention is to provide a connecting fitting for the prefabricated kamaress construction method that reduces the bending stress applied to the connecting fittings for the prefabricated kamaress construction method when extending and fastening a power transmission line, prevents deformation, etc., enables repeated use of the kamaress fittings, and improves the workability and shortens the work time for extending and fastening a power transmission line, as well as a connecting fitting for the prefabricated kamaress construction method and a connecting and fastening method using the same. [Means for solving the problem]

[0011] The invention according to claim 1 is a connecting metal fitting for a prefabricated camless construction method for use in extending and fastening a transmission line between steel towers, The connecting fittings for the prefabricated kamaress construction method include a kamaress fitting, a wire drawing tool, and a wire tightening tool, The kamaress fittings are made up of two or three kamaress fittings including a first kamaress fitting and a second kamaress fitting whose longitudinal ends are rotatably connected to each other via a connecting shaft, The first camless fitting has the other end in the longitudinal direction rotatably connected to an end of the compression clamp via a first connecting shaft, The second camless fitting has another end in the longitudinal direction rotatably connected to a wire drawing tool via a third connecting shaft, The other end of the wire drawing tool in the longitudinal direction is rotatably connected to the end of the wire connector via a fourth connecting shaft, The present invention relates to a connecting fitting for use in prefabricated kamaress construction, characterized in that the wiring tool is rotatably connected to the first kamaress fitting via a wiring tool mounting portion.

[0012] The invention according to claim 2 is characterized in that the width D1 in the direction perpendicular to the surface where the clevis part or the eye part of the first camless fitting or the second camless fitting contacts the hanging trolley is substantially equal to the width D2 in the direction perpendicular to the surface where the clevis part or the eye part of the second camless fitting or the extension tool contacts the hanging trolley, and the relationship between the groove width D3 of the connecting part via the third connecting shaft of the second camless fitting through which the hanging trolley passes and the extension tool and the diameter D4 of the hanging trolley is D3 < D4. It relates to the connecting fitting for the prefabricated camless method according to claim 1.

[0013] The invention according to claim 3 is a connecting fitting for the prefabricated camless method used for extending and tensioning transmission lines installed between iron towers, The connecting fitting for the prefabricated camless method comprises a camless fitting, an extension tool, and a tensioning tool. One end of the camless fitting in the longitudinal direction is rotatably connected to the end of the compression clamp via a first connecting shaft, and the other end in the longitudinal direction is rotatably connected to the extension tool via a second connecting shaft. The other end of the extension tool in the longitudinal direction is rotatably connected to another extension tool via a third connecting shaft. The other end of the other extension tool in the longitudinal direction is rotatably connected to the end of the wire connector via a fourth connecting shaft. The tensioning tool is rotatably connected to the camless fitting through the mounting hole of the tensioning tool mounting part. It relates to the connecting fitting for the prefabricated camless method.

[0014] The invention according to claim 4 is characterized in that the width D1 in the direction perpendicular to the surface where the clevis part or the eye part of the camless fitting or the extension tool contacts the hanging trolley is substantially equal to the width D2 in the direction perpendicular to the surface where the clevis parts or the eye parts of the adjacent extension tools contact the hanging trolley, and the relationship between the groove width D3 of the connecting part via the fourth connecting shaft of the extension tool through which the hanging trolley passes and the wire connector and the diameter D4 of the hanging trolley is D3 < D4. It relates to the connecting fitting for the prefabricated camless method according to claim 3.

[0015] The invention of claim 5 relates to a connecting fitting for prefabricated kamaress construction method described in any one of claims 1 to 4, wherein the kamaress fitting is selected from the group consisting of right-angle clevis, right-angle clevis link, angle clevis, angle clevis link, right-angle link, and angle link.

[0016] The invention of claim 6 relates to a method for extending and fastening a power transmission line between steel towers using the connecting fittings for the prefabricated camless construction method, wherein the extending tool, which is a part of the connecting fittings for the prefabricated camless construction method, is used during the extending work and can be removed before the fastening work. Effect of the Invention

[0017] According to the invention of claim 1, the connecting fittings for the prefabricated kamaress construction method are composed of a kamaress fitting, a wire drawing tool, and a wire tightening tool, and the kamaress fittings are composed of two or three kamaress fittings including a first kamaress fitting and a second kamaress fitting, the longitudinal ends of which are rotatably connected to each other via a connecting shaft, the other longitudinal end of the first kamaress fitting is rotatably connected to an end of a compression clamp via a first connecting shaft, and the second kamaress fitting is composed of a first kamaress fitting and a second kamaress fitting, the other longitudinal end of which is rotatably connected to an end of a compression clamp via a first connecting shaft, and the other longitudinal end of the second kamaress fitting is rotatably connected to an end of a compression clamp via a first connecting shaft, and the other longitudinal end of the first kamaress fitting is rotatably connected to an end of a compression clamp via a first connecting shaft, and the other longitudinal end of the second kamaress fitting is rotatably connected to an end of a compression clamp via a first connecting shaft. The other end in the longitudinal direction is rotatably connected to the wire drawing tool via a third connecting shaft, and the other end in the longitudinal direction of the wire drawing tool is rotatably connected to the end of the wire connector via a fourth connecting shaft, and the wire tightening tool is rotatably connected to the first kamaress fitting via the wire tightening tool mounting portion, so that the bending load applied to the connecting fitting for the prefabricated kamaress construction method during drawing and tightening is reduced, and deformation of the kamaress fitting and peeling of the surface plating can be prevented. In addition, the wire tightening tool used when tightening the wire does not need to be manufactured to precise dimensions so that the mounting part of the wire tightening tool fits tightly against the coverless fitting to which the wire tightening tool is attached, and a general-purpose tool that is not limited by structure or shape can be used.

[0018] According to the invention according to claim 2, the width D1 in the direction perpendicular to the surface where the clevis part or eye part of the first camless fitting or the second camless fitting contacts the hanging trolley, and the width D2 in the direction perpendicular to the surface where the clevis part or eye part of the second camless fitting or the extension tool contacts the hanging trolley are substantially equal. Since the relationship between the groove width D3 of the connecting part via the third connecting shaft of the second camless fitting through which the hanging trolley passes and the extension tool and the diameter D4 of the hanging trolley is D3 < D4, in extension work such as when used for replacing electric wires, when passing the hanging trolley, the sway of the transmission line due to steps can be suppressed. Therefore, there is no need for a pad for eliminating the steps of the conventionally used camless fitting. For this reason, the time for attaching and detaching the pad can be shortened, and the workability can be improved.

[0019] According to the invention according to claim 3, the connecting fitting for the prefabricated camless method is composed of a camless fitting, an extension tool, and a tensioning tool. One end in the longitudinal direction of the camless fitting is rotatably connected to the end of the compression clamp via a first connecting shaft, and the other end in the longitudinal direction is rotatably connected to the extension tool via a second connecting shaft. One end in the longitudinal direction of the extension tool is rotatably connected to another extension tool via a third connecting shaft. One end in the longitudinal direction of the other extension tool is rotatably connected to the end of the wire connector via a fourth connecting shaft. The tensioning tool is rotatably connected to the camless fitting through the mounting hole of the tensioning tool mounting part. Therefore, the bending load applied to the camless fitting during extension and tensioning is reduced, and deformation of the camless fitting and peeling of the surface plating can be prevented. Also, even in the tensioning tool used during tensioning, there is no need to manufacture it with precise dimensions so that the mounting part of the tensioning tool adheres closely to the camless fitting to which the tensioning tool is mounted, and a general-purpose tool that does not adhere to the structure and shape can be used.

[0020] According to the invention according to claim 4, the width D1 in the direction perpendicular to the surface where the clevis part or the eye part of the camales fitting or the extension tool contacts the suspension trolley, and the width D2 in the direction perpendicular to the surface where the clevis part or the eye part of the adjacent extension tools contact the suspension trolley are substantially equal. Since the relationship between the groove width D3 of the connection part via the fourth connecting shaft of the extension tool and the wire connector through which the suspension trolley passes and the diameter D4 of the suspension trolley is D3 < D4, when passing the suspension trolley in extension work such as when used for wire replacement, the sway of the transmission line due to the step can be suppressed. Therefore, there is no need for a pad to eliminate the step of the conventionally used camales fitting. For this reason, the time for attaching and detaching the pad can be shortened, and the workability can be improved.

[0021] According to the invention according to claim 5, since the camales fitting is selected from the group consisting of a right-angle clevis, a right-angle clevis link, an angle clevis, an angle clevis link, a right-angle link, and an angle link, it is not a high-strength and expensive camales fitting using a special material such as chrome molybdenum steel, but a tool commonly used in the construction method of overhead transmission lines and the like, and a lightweight, inexpensive, and highly versatile material can be used.

[0022] According to the invention according to claim 6, it is a method for extending and tensioning a transmission line between towers using a connecting fitting for the prefabricated camales method. The extension tool, which is a part of the connecting fitting for the prefabricated camales method, is used during the extension work and can be removed before the tensioning work. Therefore, the removed extension tool can be reused. Also, compared with the conventional tensioning work, the number of parts can be reduced, the workability can be improved, and the working time of the worker (especially the working time at high places) can be shortened.

Brief Description of the Drawings

[0023] [Figure 1] It is a plan view of a connecting fitting for the prefabricated camales method according to an embodiment of the present invention. (a) is a plan view of a connecting fitting for the prefabricated camales method according to an embodiment of the present invention, and (b) is a plan view showing the 90° side direction of (a). [Diagram 2]1A is a plan view of a connecting fitting for prefabricated kamaress construction method according to a modified example of the present invention, and FIG. 1B is a plan view showing a 90° side view of the plan view of FIG. 1A. [Diagram 3] FIG. 11 is a plan view for explaining the situation in which a sling sheave passes through a connecting fitting for a prefabricated kamaress construction method according to an embodiment of the present invention, where (a) is a plan view of a connecting fitting for a prefabricated kamaress construction method according to one embodiment of the present invention, (b) is a plan view showing a 90° side direction of (a), (c) is an explanatory diagram when a sling sheave passes through (a), and (d) is an explanatory diagram when a sling sheave passes through (b). [Figure 4] FIG. 11 is a plan view showing a connecting fitting for a prefabricated kamaress construction method in the prior art, where (a) is a plan view showing a conventional connecting fitting for a prefabricated kamaress construction method, (b) is a plan view showing a 90° side view of (a), and (c) is a plan view of a kamaress fitting when a tensioning tool is connected to it. [Diagram 5] FIG. 1 is a plan view showing one embodiment of a fastening tool for connecting two or one kamaress fittings according to the present invention, where (a) is a plan view showing the fastening tool for two kamaress fittings, and (b) is a plan view showing the fastening tool for one kamaress fitting. [Figure 6] 1A and 1B are explanatory diagrams of a measurement experiment on the stress and strain generated against a tensile load when drawing a wire in a camares fitting according to the present invention, where (a) is an explanatory diagram of the experimental conditions, and (b) is a diagram showing the measurement results. [Figure 7] 1A and 1B are explanatory diagrams of a measurement experiment on the amount of generated stress and generated strain against a tensile load during wire drawing in a comparative example, where (a) is an explanatory diagram of the experimental conditions, and (b) is a diagram showing the measurement results. [Figure 8] 5A and 5B are explanatory diagrams of a measurement experiment on the amount of generated stress and generated strain against a tensile load during fastening of a wire in a comparative example, where (a) is an explanatory diagram of the experimental conditions, and (b) is a diagram showing the measurement results. [Figure 9] FIG. 1 is a perspective view of a wire-drawing iron car portion when implementing a conventional prefabricated camless construction method. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0024] Hereinafter, preferred embodiments of a connecting fitting for a prefabricated camaress construction method according to the present invention will be described with reference to the drawings. The connecting fitting for the prefabricated camares construction method according to the present invention will be described with reference to Figs. 1 to 4.

[0025] FIG. 1 is a plan view of a connecting fitting (1) for a prefabricated kamaress construction method according to an embodiment of the present invention, in which a first kamaress fitting (21) and a second kamaress fitting (22) are both composed of a right-angle clevis link (CLR) (2). FIG. 2 is a plan view of a connecting fitting (1) for prefabricated kamaress construction according to a modified example of the present invention, in which the first kamaress fitting (21) is composed of a right-angle clevis (CR) (3) and the second kamaress fitting (22) is composed of a right-angle link (LR) (4).

[0026] As shown in Figures 1 and 2, the connecting fitting (1) for prefabricated kamaress construction method according to the present invention is composed of a kamaress fitting, a wire drawing tool (5), and a wire tightening tool (not shown in Figures 1 and 2). In addition, the first kamaress fitting (21) and the second kamaress fitting (22) are tools commonly used in the extension and tightening methods of overhead transmission lines, and any of the following may be used as long as they are obvious to those skilled in the art, such as a right-angle clevis (3), a right-angle clevis link (2), an angle clevis, an angle clevis link, a right-angle link (4), an angle link, etc.

[0027] The connecting fitting (1) for the prefabricated kamaress construction method integrates the first kamaress fitting (21) and the second kamaress fitting (22) by connecting the first kamaress fitting (21) and the second kamaress fitting (22) with a second connecting shaft (12). The connecting fitting (1) for the prefabricated kamaress construction method has a roughly elliptical shape when viewed from above, and is connected to the wire connector (33) in the following order from the short clamp (C): the first kamaress fitting (21), the second kamaress fitting (22), and the wire extension tool (5). The components of the connecting fitting (1) for the prefabricated kamaress construction method each have a connecting shaft at its longitudinal end, and the short clamp (C) and the first kamaress fitting (21) are rotatably connected by the first connecting shaft (11), the first kamaress fitting (21) and the second kamaress fitting (22) by the second connecting shaft (12), the second kamaress fitting (22) and the wire drawing tool (5) by the third connecting shaft (13), and the wire drawing tool (5) and the wire connector (33) by the fourth connecting shaft (14). During the wire fastening operation, the wire fastening tool (6) is rotatably connected to the first camless fitting (21) via a wire fastening tool attachment portion (not shown in Figs. 1 and 2).

[0028] As described above, the first kamaress fitting (21) and the second kamaress fitting (22) are members having the same shape (see FIG. 1). However, they may each be a different member. For example, the first kamaress fitting (21) may be the kamaress fitting shown in FIG. 1, and the second kamaress fitting (22) may be the kamaress fitting shown in FIG.

[0029] The shape of the connecting fitting (1) for the prefabricated kamaress construction method is not limited to an approximately elliptical shape when viewed from above, and may be any shape, such as an oval shape, a rectangular shape, or the like, as long as it allows the first kamaress fitting (21) and the second kamaress fitting (22) to be integrated together. Furthermore, the shapes of the second connecting shaft (12) and the third connecting shaft (13) are such that they can be rotatably connected to the first kamares fitting (21) and the second kamares fitting (22), and may be any shape that is obvious to a person skilled in the art.

[0030] As described above, the connecting mechanism of the first kamaress fitting (21) and the second kamaress fitting (22) of the connecting fitting (1) for the prefabricated kamaress construction method is not particularly limited. For example, as shown in FIG. 1(a), the first kamaress fitting (21) and the second kamaress fitting (22) may be connected by a cotter pin (P) provided on both ends thereof. In addition, the first connecting shaft (11), the second connecting shaft (12), and the third connecting shaft (13) may use not only cotter pins (P) but also any other components that are commonly used for connections, such as bolts, and that are obvious to those skilled in the art.

[0031] FIG. 3 is a plan view for explaining the situation in which a hoist (K2) passes through a connecting fitting (1) for a prefabricated kamaress construction method according to an embodiment of the present invention, where (a) is a plan view of the connecting fitting (1) for a prefabricated kamaress construction method according to one embodiment of the present invention, (b) is a plan view showing a 90° side direction of (a), (c) is an explanatory diagram when the hoist (K2) passes through (a), and (d) is an explanatory diagram when the hoist (K2) passes through (b).

[0032] The sling car (K2) is used in the sling extension method adopted for the replacement and removal of power lines. The sling car (K2) is used by hanging a large number of them from the support wires (electric wires or support ropes) stretched between steel towers, and is used to replace, remove, and install power lines.

[0033] The slinging method is a method in which a metal cart is hung not only from a steel tower but also from an existing transmission line in a span, a transmission line that has been extended, or a newly erected wire rope (support wire), and the transmission line is pulled on the metal cart by a messenger wire. The method prevents the transmission line and the wire rope for extension in the span from sagging by supporting them with a small metal cart (slinging cart (K2)) hung from an existing transmission line, a transmission line that has been extended, or a newly erected wire rope (support wire). Since the transmission line is supported by a support wire to prevent sagging, the extension tension of the transmission line is small, and the load on the transmission line is significantly less than in the pull-out extension method, and it is applied to extension that requires low tension, such as replacing deteriorated electric cables. The distinctive feature of the sling method is that it allows cable to be laid without installing protective equipment even if there are objects passing through within the laying area, and it is used for laying cable in locations where it is difficult to construct scaffolding, such as urbanized areas with a large number of objects to be protected, and at extra-high voltage, railway and expressway crossings, or where live parts are close by.

[0034] Figs. 3(a) and 3(b) show the connecting fitting (1) for the prefabricated camless method shown in Fig. 1. In this connecting fitting (1) for the prefabricated camless method, the length from the first connecting shaft (11) to the second connecting shaft (12) of the first camless fitting (21) is 90 mm, the length from the second connecting shaft (12) to the third connecting shaft (13) of the second camless fitting (22) is 80 mm, and the length from the third connecting shaft (13) to the fourth connecting shaft (14) of the extension tool (5) is 80 mm. The sum of the lengths of these three parts is 250 mm. Also, when the width in the direction perpendicular to the surface where the clevis part or eye part of the first camless fitting (21) or the second camless fitting (22) contacts the suspension trolley (K2) is D1, and the width in the direction perpendicular to the surface where the clevis part or eye part of the second camless fitting (22) or the extension tool (5) contacts the suspension trolley (K2) is D2, in one embodiment according to the present invention, as shown in (c), the lengths of both D1 and D2 are 80 mm and are substantially equal. Further, when the groove width of the connecting part via the third connecting shaft (13) between the second camless fitting (22) and the extension tool (5) through which the suspension trolley (K2) passes is D3, and the diameter of the suspension trolley (K2) is D4, in one embodiment according to the present invention, as shown in (c), when D3 < D4, the amount of strain generated when the suspension trolley (K2) passes through the connecting fitting (1) for the prefabricated camless method can be reduced. Thus, the connecting fitting (1) for the prefabricated camless method shown in Fig. 3 can reduce the amount of strain generated when the suspension trolley passes through, so it is difficult to deform and can be safely used for a long time.

[0035] Fig. 4 shows a connecting fitting for the prefabricated camless method in the prior art. (a) is a plan view showing a conventional product of the connecting fitting for the prefabricated camless method, (b) is a plan view showing the 90° side direction of (a), and (c) is a plan view showing the state when a tensioning tool (6) is connected to the intermediate camless fitting (23).

[0036] As shown in Fig. 4, in the conventional connecting fitting for the prefabricated camless method, it is connected to the wire connector (33) in the order of the first camless fitting (21), the intermediate camless fitting (23), and the extension tool (5) from the short clamp (C) side. The conventional prefabricated kamaress construction connecting fitting (1) of the present invention is configured with an intermediate kamaress fitting (23) between the first kamaress fitting (21) and the wire drawing tool (5) as shown in Fig. 4, the length between the second connecting shaft (12) and the third connecting shaft (13) being 160 mm, which is twice as long as the second kamaress fitting (22) of Fig. 1. Since the intermediate kamaress fitting (23) has a length twice as long as the second kamaress fitting (22) of Fig. 1 of the present invention, when the sling (K2) passes through the conventional prefabricated kamaress construction connecting fitting, it must overcome a groove width (D3) larger than the diameter (D4) of the sling (K2), which causes the power line to sway and a large bending stress to be applied to the kamaress fittings, etc., causing deformation and peeling of the plating on the surface. In addition, the connecting fittings for the conventional prefabricated kamaress construction method each have a connecting shaft at its longitudinal end, and the short clamp (C) and the first kamaress fitting (21) are rotatably connected by the first connecting shaft (11), the first kamaress fitting (21) and the intermediate kamaress fitting (23) by the second connecting shaft (12), the intermediate kamaress fitting (23) and the wire drawing tool (5) by the third connecting shaft (13), and the wire drawing tool (5) and the wire connector (33) by the fourth connecting shaft (14). During the wire tightening operation, the wire tightening tool (6) is connected via the wire tightening tool attachment portion (15) of the intermediate camless fitting (23).

[0037] FIG. 5 shows one embodiment of a fastening tool for connecting two or one kamaress fittings according to the present invention, where (a) is a plan view showing the fastening tool when there are two kamaress fittings, and (b) shows the fastening tool when there is one kamaress fitting. In the case of two kamaress fittings as shown in (a), the first kamaress fitting (21) and the fastening tool (6) are connected via the fastening tool attachment portion (15). In the case of one kamaress fitting as shown in (b), a mounting hole is provided in the tensioning tool mounting portion (15) of the first kamaress fitting (21) to connect the tensioning tool (6), but the location, number and shape of the mounting holes in the tensioning tool mounting portion (15) are not particularly limited. As shown in FIG. 5, the wire tightening tool (6) according to the present invention may be, for example, a special parallel clevis (7) or a U-clevis (8), but any component that is obvious to a person skilled in the art may be used.

[0038] An example of the prefabricated camaress construction method according to the present invention will be described below. Note that the construction method described below is only an example and is not limited to this. In the following example, the wiring work is carried out using the connecting fitting (1) for the prefabricated kamaress construction method according to the present invention, but this is not limited to this, and any connecting fitting (1) for the prefabricated kamaress construction method that can carry out the following steps and that is obvious to a person skilled in the art may be used.

[0039] First, the work of extending the power transmission line will be carried out. During the wire-drawing operation, the first kamaress fitting (21) is rotatably connected to the short clamp (C), and the drawing wire is connected to the drawing tool (5) at the other end of the connecting fitting for the prefabricated kamaress construction method via a wire connector (33). A wire-drawing cart (K1) is attached to the steel tower in the wire-drawing section, and the messenger wires stretched from the drum yard to each steel tower, and from each steel tower to the engine yard are wound up with a winch to pull the transmission line (L) connected to the end. The method of the wire extension work and the tools used therefor are not particularly limited, and any method and tools may be used as long as they are normally used in the wire extension work of a power transmission line (L) and are obvious to a person skilled in the art.

[0040] After the wire-drawing work is completed, the wire-tightening work is carried out. The connecting fitting (1) for the prefabricated kamaress construction method according to the present invention allows the wire-drawing tool (5) to be removed, and after the wire-drawing tool (5) is removed, the wire-tightening work may be carried out by connecting the wire-tightening tool (6) to the wire-tightening tool attachment portion (15) of the first kamaress fitting (21). This makes it possible to reduce the number of parts used during the wiring work, thereby improving workability and shortening the work time (particularly the work time at high altitudes). In addition, the wire-drawing tool (5) that can be removed after the wire-drawing work is completed is not particularly limited, and any tool that is normally used when drawing a power transmission line (L) and is obvious to a person skilled in the art can be used. EXAMPLES

[0041] The effects of the present invention will be made clearer by showing examples of the connecting fitting for the prefabricated camless construction method and the wire extension and fastening construction method using the same, as follows. However, the present invention is not limited to the following examples.

[0042] (Measurement of stress and strain generated by tensile load during wire drawing) The stress and strain generated in the kamaress metal fittings due to the tensile load during cable extension was measured using the kamaress metal fittings used in the prefabricated kamaress construction method according to the present invention and conventional kamaress metal fittings. As the kamaress fitting according to the present invention, the kamaress fitting shown in FIG. 1 was used. As a comparative example, CLPK-2423PK (manufactured by Nippon Katan Co., Ltd.) was used as the kamaress fitting. Table 1 shows the stress (N / mm2) generated at the positions (P-1, P-2) shown in FIG. 6(a) when tensile loads of 10, 20, 30 and 38 kN were applied to the camless fitting according to the present invention with a wheel wrap angle of 45°. 2 ) and the amount of generated strain (μs) are shown.

[0043] [Table 1]

[0044] Table 2 shows the stress (N / mm2) generated at the positions (P-3, P-4, P-5, P-6) shown in Figure 7(a) when tensile loads of 10, 20, 30, and 38 kN were applied to a conventional camless fitting as a comparative example with a wheel wrap angle of 45°. 2 ) and the amount of generated strain (μs) are shown.

[0045] [Table 2]

[0046] As shown in Tables 1 and 2, the stress (N / mm 2 ) and the amount of generated strain (μs) were smaller than those of the comparative example. The stress generated in the kamaress fitting according to the present invention was approximately 43% of the stress generated in the conventional kamaress fitting. From these results, the stress (N / mm 2 ) and the amount of generated strain (μs) were smaller than those of the conventional product. Therefore, the kamares fitting according to the present invention can be used repeatedly and safely for a longer period of time than the conventional product.

[0047] (Measurement of stress and strain caused by tensile load during fastening) Next, the stress and strain against the tensile load during fastening were measured using the connecting fitting for the prefabricated kamaress construction method according to the present invention and the conventional connecting fitting for the prefabricated kamaress construction method. As the connecting metal fitting for the prefabricated kamaress construction method according to the present invention, the connecting metal fitting for the prefabricated kamaress construction method shown in FIG. 1 was used. As a comparative example, a conventional connecting metal fitting for the prefabricated kamaress construction method was used. The kamaress metal fitting was CLPK-2423PK (manufactured by Nippon Katan Co., Ltd.). Table 3 shows the stress (N / mm2) generated at the positions (P-7, P-8, P-9, P-10, P-11) shown in FIG. 8(a) when tensile loads of 10, 20, 30, 40, 50, and 55 kN were applied using the conventional connecting fittings for the prefabricated camless construction method of the comparative example. 2 ) and the amount of generated strain (μs) are shown.

[0048] [Table 3]

[0049] On the other hand, when tensile loads of 10, 20, 30, 40, 50, and 55 kN were applied to the kamaress metal fitting shown in FIG. 1 using the connecting fitting for prefabricated kamaress construction according to the present invention, no stress or distortion was generated in the kamaress metal fitting. As a result, by using the connecting fittings for the prefabricated kamaress construction method according to the present invention, it is possible to prevent distortion of the wiring tool due to bending stress and peeling of the plating on the surface during wiring. Therefore, by using the connecting fittings for the prefabricated kamaress construction method according to the present invention for wiring work, the same kamaress fittings can be used repeatedly for a long period of time. [Industrial Applicability]

[0050] The connecting fittings for the prefabricated kamaress construction method according to the present invention reduce the bending stress (amount of strain) applied to the kamaress fittings and the like during the extension and fastening of the power transmission line, thereby reducing the risk of deformation, damage, and peeling of the plating on the surface of the kamaress fittings and fastening tools, and can therefore be used repeatedly for a long period of time. In addition, the number of parts and weight of the kamaress fittings can be reduced by using tools made of general-purpose materials, and furthermore, the extension tools can be removed before the fastening work, allowing them to be used repeatedly, leading to cost reduction. In addition, they can be effectively used to ensure the safety of the public and the safety of workers performing the extension and fastening work, improve workability, and shorten work hours and construction periods. Therefore, the connecting fitting for the prefabricated camless construction method according to the present invention can be suitably used for wire extension and tightening work between steel towers. [Explanation of symbols]

[0051] 1. Prefabricated Kamaress Construction Method Connecting Fittings 2 Right angle clevis link (CLR) 3 Right angle clevis (CR) 4 Right angle link (LR) 5 Wire extension tools 6 Tensioning tools 7 Special Parallel Clevis 8 U clevis 11 1st connection shaft 12 2nd connection shaft 13 Third connection shaft 14 4th connection shaft 15 Wire tightening tool attachment 21 First Kamares fitting 22 Second Kamares fitting 23 Intermediate Kamaress bracket 31 Compression type clamp 31a Eye Section 32 Kamares fittings 32a Clevis part 32b Eye Section 32c Eye Club 32c' mounting hole 33 Wire Connector C Short Clamp D1 The width perpendicular to the surface where the clevis or eye of the camless fitting or wire drawing tool contacts the sling. D2 The width in the direction perpendicular to the surface where the clevis or eye of the camless fitting or wire drawing tool contacts the sling. D3 Gap width of the connecting part through the connecting shaft through which the sling wheel passes D4 Diameter of the shackle K1 Metal wheel for wire extension K2 hanging wheel P Cotter Pin L Power Line

Claims

1. A prefabricated connecting fitting for use in extending and fastening a power transmission line between steel towers, The connecting fittings for the prefabricated kamaress construction method include a kamaress fitting, a wire drawing tool, and a wire tightening tool, The kamaress fittings include two or three kamaress fittings including a first kamaress fitting and a second kamaress fitting, the longitudinal ends of which are rotatably connected to each other via a connecting shaft, The first camless fitting has another end in a longitudinal direction rotatably connected to an end of a compression clamp via a first connecting shaft, The second camless fitting has another end in a longitudinal direction rotatably connected to a wire drawing tool via a third connecting shaft, The other end of the wire drawing tool in the longitudinal direction is rotatably connected to the end of the wire connector via a fourth connecting shaft, A connecting fitting for use in a prefabricated kamaress construction method, characterized in that the wiring tool is rotatably connected to the first kamaress fitting via a wiring tool mounting portion.

2. The connecting fitting for the prefabricated kamaress construction method according to claim 1, characterized in that a width D1 in a direction perpendicular to a surface where the clevis portion or eye portion of the first kamaress fitting or the second kamaress fitting contacts the hoist and a width D2 in a direction perpendicular to a surface where the clevis portion or eye portion of the second kamaress fitting or the wire drawing tool contacts the hoist are approximately equal, and a relationship between a groove width D3 of a connection portion via a third connecting shaft of the second kamaress fitting and the wire drawing tool through which the hoist passes and a diameter D4 of the hoist is D3 < D4.

3. A prefabricated connecting fitting for use in extending and fastening a power transmission line between steel towers, The connecting fittings for the prefabricated kamaress construction method include a kamaress fitting, a wire drawing tool, and a wire tightening tool, The camless fitting has one end in a longitudinal direction rotatably connected to an end of the compression clamp via a first connecting shaft, and the other end in a longitudinal direction rotatably connected to the wire drawing tool via a second connecting shaft, The other end of the wire drawing tool in the longitudinal direction is rotatably connected to another wire drawing tool via a third connecting shaft, the other end of the other wire drawing tool in the longitudinal direction is rotatably connected to the end of the wire connector via a fourth connecting shaft; A connecting fitting for prefabricated kamaress construction, characterized in that the wiring tool is rotatably connected to the kamaress fitting through a mounting hole in the wiring tool mounting portion.

4. The connecting fitting for the prefabricated kamaress construction method as described in claim 3, characterized in that a width D1 perpendicular to a surface where the clevis portion or eye portion of the kamaress fitting or the wire drawing tool contacts the hoist and a width D2 perpendicular to a surface where the clevis portion or eye portion of adjacent wire drawing tools contacts the hoist are approximately equal, and a relationship between a groove width D3 of a connection portion between the wire drawing tool and the fourth connecting shaft of the wire connector through which the hoist passes and a diameter D4 of the hoist is D3 < D4.

5. The connecting fitting for the prefabricated kamaress construction method according to any one of claims 1 to 4, wherein the kamaress fitting is selected from the group consisting of right-angle clevises, right-angle clevis links, angle clevises, angle clevis links, right-angle links, and angle links.

6. A method for extending and fastening a power transmission line between steel towers using a connecting fitting for a prefabricated kamaress construction method as described in claim 1 or 3, wherein the extending tool, which is part of the connecting fitting for the prefabricated kamaress construction method, is used during the extending work and can be removed before the fastening work.

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