Wire breakage / fall prevention structure and construction method for wire breakage / fall prevention structure

Abstract

To provide a structure for preventing wire breakage and falling that is less subject to restrictions on the work location, and a method for constructing the structure for preventing wire breakage and falling. [Solution] The structure 900 for preventing breakage and falling of an electric wire W1 comprises a coil-shaped wire member 200 that can expand and contract while the electric wire W1 is inserted therethrough, a ring-shaped head 110, and a dead-end fitting 100 having two spiral legs 120 extending from each end of the head and capable of being wound around the electric wire W1 for attachment, wherein the two dead-end fittings 100 are attached to the electric wire W1 so that they face in opposite directions and the heads 110 are fixed to each other, and an end 240 of the wire member 200 is fixed to the head 110 of the dead-end fitting 100.

Description

[Technical Field]

[0001] The present invention relates to a wire breakage and fall prevention structure that prevents a broken wire from falling when the wire, for example, that is strung between utility poles, breaks, and a method for installing the wire breakage and fall prevention structure. [Background technology]

[0002] Conventionally, fall prevention ropes have been used to prevent electric wires strung between utility poles and the like from breaking and falling. These fall prevention ropes are attached to adjacent electric wires so as to bridge the wires. Even if one of the wires breaks and is about to fall, the fall prevention rope holds the broken wire in place, preventing it from falling. Furthermore, to prevent the wire from falling no matter where it breaks, it is necessary to attach multiple fall prevention ropes at approximately equal intervals along the entire length of the wire. When attaching fall prevention ropes, workers are required to work at high altitudes using a bucket truck carrying workers, but this work is difficult in narrow spaces where the bucket truck cannot enter. Summary of the Invention [Problem to be solved by the invention]

[0003] Therefore, in consideration of the above problems, the present invention provides a structure for preventing wire breakage and falling, and a method for installing the structure for preventing wire breakage and falling, which are less subject to restrictions on the work location. [Means for solving the problem]

[0004] In order to solve the above problems, the structure for preventing breakage and falling of the present invention is a structure for preventing breakage and falling of an electric wire, and is characterized in that it comprises a coil-shaped wire member that can expand and contract while the electric wire is inserted therethrough, a ring-shaped head, and a dead-end fitting having two spiral legs extending from each end of the head and capable of being wrapped around the electric wire and attached thereto, and the two dead-end fittings are attached to the electric wire so that they face in opposite directions and the heads of the two dead-end fittings are fixed to each other, and the ends of the wire member are fixed to the heads of the dead-end fittings.

[0005] According to the above features, by using two dead-end fasteners, it is possible to attach the wire member to any location on the electric wire. Therefore, since the wire breakage prevention structure can be installed at any location on the electric wire, there are fewer restrictions on the work location. Furthermore, because an extendable coiled wire member is used, flexible installation is possible in narrow spaces where it is not possible to install dead-end fasteners by extending the wire member.

[0006] Furthermore, the structure for preventing wire breakage and dropping of the present invention is characterized in that the winding directions of the helical leg portions of the two end fasteners are opposite to each other.

[0007] According to the above feature, even if an external force is applied in a direction that twists the helical leg portion of the fastener, the overall fastening force of the two fasteners can be maintained.

[0008] Furthermore, the wire breakage and drop prevention structure of the present invention is characterized in that at least two of the electric wires are arranged side by side and are provided with a connecting rope connecting the head of the fastening fitting attached to one of the electric wires to the head of the fastening fitting attached to the other of the electric wires.

[0009] According to the above feature, the broken electric wire is supported by the connecting rope connected to the adjacent electric wire, and the electric wire can be prevented from dropping downward. [Effects of the Invention]

[0010] According to the wire breakage and fall prevention structure and the method for installing the wire breakage and fall prevention structure of the present invention, there are fewer restrictions on the work location. [Brief explanation of the drawings]

[0011] [Figure 1] FIG. 1(a) is an overall perspective view of a terminal fastener 100, and FIG. 1(b) is an overall perspective view of a wire member 200. As shown in FIG. [Figure 2] FIG. 2 is an overall perspective view of the connecting rope 300. As shown in FIG. [Figure 3] FIG. 3 is a perspective view of an electric wire W to which the wire breakage and fall prevention structure 900 is applied. [Figure 4] 4(a) is a perspective view of the state in which the wire member 200 is attached to the electric wire W, and FIG. 4(b) is a perspective view of the state in which the first dead-end fitting 100 is attached to the electric wire W. FIG. [Figure 5] 5(a) to 5(c) are perspective views showing the state in which the second dead-end fitting 100 is attached to the electric wire W. FIG. [Figure 6] 6(a) is a perspective view showing two dead-end fittings 100 attached to an electric wire W, and FIG. 6(b) is an enlarged perspective view showing the vicinity of a head 110 of the dead-end fitting 100. FIG. [Figure 7] FIG. 7 is a perspective view of the entire completed wire breakage and drop prevention structure 900. [Figure 8] FIG. 8 is a perspective view of the entire structure 900 for preventing wire breakage and falling. [Figure 9] FIG. 9 is a perspective view of the entire structure 900 for preventing wire breakage and falling. [Explanation of symbols]

[0012] 100 Clamp 110 Head 120 Spiral leg 200 Wire material 240 End 900 Breakage and fall prevention structure W1 electric wire DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the shapes of the drawings referred to in the following description are conceptual or schematic diagrams for explaining preferred shapes and dimensions, and the dimensional ratios and the like do not necessarily correspond to the actual dimensional ratios. In other words, the present invention is not limited to the dimensional ratios in the drawings.

[0014] 1(a) shows a dead-end fitting 100 used in a wire breakage and drop prevention structure 900 of the present invention. FIG. 1(a) is an overall perspective view of the dead-end fitting 100.

[0015] As shown in FIG. 1(a), the dead-end fastener 100 is formed using a metal linear body 101 as a skeleton, the surface of which is covered with a synthetic resin coating. The dead-end fastener 100 has a head 110 bent into an annular shape and two helical legs 120 extending from each end of the head 110. The head 110 serves as a location where various components, such as the end of a wire member or a connecting rope, can be secured, as will be described later. The helical legs 120 are formed by twisting the linear body 101 into a spiral shape, and the two helical legs 120 have alternating spiral portions so that they can be wound around the electric wire W alternately.

[0016] 1(b) shows a wire member 200 used in the wire breakage / drop prevention structure 900 of the present invention. FIG. 1(b) is an overall perspective view of the wire member 200.

[0017] As shown in FIG. 1(b), the wire member 200 is formed into an expandable coil shape and is made of insulating resin. An electric wire W can be inserted into a space 210 inside the coil of the wire member 200. A connection terminal 240 is attached to one end 220 of the wire member 200. The one end 220 of the wire member 200 can be connected to the dead-end fastening device 100 by passing the linear body 101 of the head 110 of the dead-end fastening device 100 through a connection hole 241 of the connection terminal 240. Similarly, a connection terminal 250 is attached to the other terminal 230 of the wire member 200. The other terminal 230 of the wire member 200 can be connected to the dead-end fastening device 100 by passing the linear body 101 of the head 110 of the dead-end fastening device 100 through a connection hole 251 of the connection terminal 250. Although the connection terminals (240, 250) are attached to the ends (220, 230) of the wire member 200, this is not limitative and the connection terminals (240, 250) may be attached to the wire member 200 at any timing, such as attaching the connection terminals (240, 250) after attaching the wire member 200 to the electric wire W. Furthermore, although the end (220, 230) of the wire member 200 is fixed to the dead-end fitting 100 by the connection terminals (240, 250), this is not limitative and the end (220, 230) of the wire member 200 may be fixed to the dead-end fitting 100 by any method.

[0018] Next, Fig. 2 shows a connecting rope 300 used in the wire breakage and fall prevention structure 900 of the present invention. Fig. 2 is an overall perspective view of the connecting rope 300.

[0019] As shown in Figure 2, connecting rope 300 is formed using an insulating linear body as a skeleton, the surface of which is covered with a coating such as synthetic resin. Connecting rope 300 has first end 310 and second end 320 and third end 330 branching from first end 310. First end 310 has connection hole 311 through which linear body 101 in head 110 of dead-end fastener 100 can be connected. Similarly, second end 320 has connection hole 321 through which linear body 101 in head 110 of dead-end fastener 100 can be connected. Third end 330 has connection hole 331 through which linear body 101 in head 110 of dead-end fastener 100 can be connected.

[0020] Furthermore, first end 310 and second end 320 are connected by linear body 340, which is flexible. First end 310 and third end 330 are connected by linear body 350, which is flexible. Therefore, first end 310, second end 320, and third end 330 can be freely positioned and oriented while remaining connected. Note that connecting rope 300 includes first end 310, and second end 320 and third end 330 branching off from first end 310. However, the present invention is not limited to this, and connecting rope 300 may include only first end 310 and second end 320 as long as it can connect dead-end fittings 100 fixed to adjacent electric wires W in a bridging manner. Furthermore, each end (310, 320, 330) is connected to the head 110 of the fastener 100 by a connection hole (311, 321, 331), but this is not limited to this, and each end (310, 320, 330) may be equipped with a hook-shaped fixing device and connected to the head 110 of the fastener 100, or any other form may be used as long as it can be connected to the head 110 of the fastener 100.

[0021] Next, with reference to Fig. 3 to Fig. 7, a wire breakage / fall prevention structure 900 of the present invention and an installation method for the wire breakage / fall prevention structure 900 will be described. Fig. 3 is a perspective view of an electric wire W to which the wire breakage / fall prevention structure 900 is to be installed, Fig. 4(a) is a perspective view of the electric wire W with the wire member 200 attached, Fig. 4(b) is a perspective view of the electric wire W with the first dead-end fastening fitting 100 attached, Figs. 5(a) to 5(c) are perspective views of the electric wire W with the second dead-end fastening fitting 100 attached, Fig. 6(a) is a perspective view of the electric wire W with two dead-end fastening fittings 100 attached, Fig. 6(b) is an enlarged perspective view of the head 110 of the dead-end fastening fitting 100 and its vicinity, and Fig. 7 is a perspective view of the completed wire breakage / fall prevention structure 900 as a whole.

[0022] As shown in FIG. 3, a plurality of electric wires (electric wires W1 to W3) are installed on a utility pole P or the like via any member such as an insulator P2. First, when installing the wire breakage and drop prevention structure 900 of the present invention on the electric wire W1, as shown in FIGS. 3 and 4(a), a wire member 200 is attached to the electric wire W1 at any one end W5 of the electric wire W1. Specifically, since the wire member 200 is a single linear body formed in a coil shape from one end 220 to the other terminal 230, the wire member 200 is attached while rotating so as to be wound around the electric wire W1 from the terminal 230 side of the wire member 200. Then, the wire member 200 is attached to the electric wire W1 so that the electric wire W1 is inserted inside the wire member 200. The wire member 200 can be attached to the electric wire W1 by any method, such as using a dedicated device.

[0023] Next, as shown in FIG. 4(b), the first dead-end clamp 100A is attached to the electric wire W1. Specifically, the two helical legs 120A of the dead-end clamp 100A are alternately wound around the electric wire W1 to secure it. Note that before the helical legs 120A are wound, the second end 320 and the third end 330 of the connecting rope 300 are connected and secured to the head 110A of the dead-end clamp 100A. Specifically, the connecting rope 300 is secured by inserting the connection hole 321 of the second end 320 and the connection hole 331 of the third end 330 from the tip of one of the helical legs 120A before winding to the head 110A.

[0024] Next, a second fastening fixture 100B is prepared, and the connection terminal 240 of the wire member 200 is attached to the head 110B of the fastening fixture 100B. Specifically, the connection hole 241 of the connection terminal 240 of the wire member 200 is inserted from the tip of one of the spiral leg portions 120B before being wound to the head 110B, and fixed.

[0025] Then, as shown in Figure 5(a), one helical leg portion 120B of the dead-end fastening device 100B is passed through the connection hole 321 of the second end 320 and the connection hole 331 of the third end 330 of the connecting rope 300, and as shown in Figure 5(b), it is passed through to the head portion 110B of the dead-end fastening device 100B. Then, the head portion 110A of the dead-end fastening device 100A and the head portion 110B of the dead-end fastening device 100B are inserted through the connection hole 321 of the second end 320 and the connection hole 331 of the third end 330 of the connecting rope 300, and are fixed in place.

[0026] Next, as shown in Fig. 5(c), the two helical legs 120B of the dead-end fastening device 100B are alternately wound around and fixed to the electric wire W1. As a result, the helical legs 120A of the dead-end fastening device 100A are fixed toward the center of the electric wire W1 (to the right in the drawing), and the helical legs 120B of the dead-end fastening device 100B are fixed toward the opposite side of the center of the electric wire W1 (to the left in the drawing). In other words, the dead-end fastening device 100A and the dead-end fastening device 100B face in opposite directions, and their heads 110A and 110B are fixed to each other by the connecting rope 300. Therefore, the dead-end fastening device 100A and the dead-end fastening device 100B are firmly fixed together so that they do not move left or right along the electric wire W1.

[0027] Next, as shown in FIG. 6(a), the terminal 230 side of the wire member 200 is extended toward the other end W6 of the electric wire W1. At this time, the connection terminal 240 of the wire member 200 is fixed at one end W5 to the dead-end fitting 100B of the dead-end fitting 100B and therefore does not move. Then, at the other end W6, the terminal 230 of the wire member 200 is fixed so as not to move relative to the other end W6 using two dead-end fittings 100, in the same manner as shown in FIGS. 4 and 5. Then, as shown in FIG. 7, the connection terminal 240 and the terminal 230 of the extended wire member 200 are fixed so as not to move by the two dead-end fittings 100 at each of the one end W5 and the other end W6 of the electric wire W1, and the installation of the wire breakage and drop prevention structure 900 is completed.

[0028] In this way, the wire breakage and fall prevention structure 900 of the present invention uses two dead-end fastenings 100, making it possible to attach the wire member 200 to any location on the electric wire W1. Therefore, since the wire breakage and fall prevention structure 900 can be installed at any location on the electric wire W1, there are fewer restrictions on the work location. Furthermore, because an extendable coiled wire member 200 is used, flexible installation is possible in narrow spaces where a bucket truck cannot enter to install the dead-end fastenings 100; for example, the wire member 200 can be extended to avoid such a situation.

[0029] 7, the wire breakage / fall prevention structure 900 is also installed on the electric wires W2 and W3 arranged alongside the electric wire W1. The installation method is the same as the method used to install the wire breakage / fall prevention structure 900 on the electric wire W1. In this case, the first end 310 of the connecting rope 300 fixed to one end W5 of the electric wire W1 is connected to the head 110 of the dead-end fitting 100 fixed to the adjacent electric wire W2. Similarly, the first end 310 of the connecting rope 300 fixed to the electric wire W3 is connected to the head 110 of the dead-end fitting 100 fixed to the adjacent electric wire W2. As a result, the adjacent electric wires W1 and W2, and the adjacent electric wires W2 and W3 are connected by the connecting rope 300.

[0030] Here, as shown in Fig. 8, it is assumed that the electric wire W1 is broken around the center. Note that Fig. 8 is a perspective view of the entire wire breakage / fall prevention structure 900. Even if the electric wire W1 is broken around the center, the electric wire W1 is supported by the wire member 200 of the wire breakage / fall prevention structure 900, and the electric wire W1 can be prevented from falling and sagging downward. Also, as shown in Fig. 9, it is assumed that the electric wire W1 is broken near the insulator P2. Note that Fig. 9 is a perspective view of the entire wire breakage / fall prevention structure 900. Even if the electric wire W1 is broken near the insulator P2, the electric wire W1 is supported by the connecting rope 300 connected to the adjacent electric wire W2, and the electric wire W1 can be prevented from falling and sagging downward.

[0031] Although the wire breakage and fall prevention structure 900 is installed on the electric wires W2 and W3 arranged side by side with the electric wire W1, the present invention is not limited to this and the wire breakage and fall prevention structure 900 can be installed on at least two electric wires arranged side by side, that is, two electric wires, or three or more electric wires. As shown in FIG. 7, the connecting rope 300 of each electric wire breakage and fall prevention structure 900 is connected by two linear bodies (340, 350), so that adjacent electric wires are firmly connected to each other and can sufficiently withstand the weight, etc., of a fall. Furthermore, the wire member 200 is fixed at both ends (W5, W6) of the electric wire W1 by the dead-end fittings 100, but the present invention is not limited to this and the wire member 200 may be fixed to the electric wire W1 at one end (W5 or W6) by any method other than the dead-end fittings 100.

[0032] Furthermore, when the connecting rope 300 supports a fallen electric wire W, the connecting rope 300 pulls on the dead-end fastener 100. However, if the connecting rope 300 is pulled in a twisting manner in a direction that loosens the helical leg 120 of the dead-end fastener 100, the holding force of the dead-end fastener 100 may be weakened. However, as shown in FIG. 6(b), the winding direction of the helical leg 120A of the dead-end fastener 100A and the winding direction of the helical leg 120B of the dead-end fastener 100B are opposite each other. Therefore, even if the connecting rope 300 is pulled in a twisting manner in a direction that loosens the helical leg 120A of one dead-end fastener 100A, the helical leg 120B of the other dead-end fastener 100B is pulled in the opposite direction, that is, in a direction that tightens the helix. This allows the holding force of the dead-end fastener 100A and the dead-end fastener 100B to be maintained as a whole.

[0033] Although the case where the dead-end clamp is pulled by the connecting rope 300 has been described, dead-end clamp 100A and dead-end clamp 100B may also be subjected to a twisting external force from a member other than connecting rope 300. Even in such a case, the overall fixing force of dead-end clamp 100A and dead-end clamp 100B can be maintained. Since dead-end clamp 100A and dead-end clamp 100B have the same configuration, if dead-end clamp 100A and dead-end clamp 100B are attached to the electric wire W so that they face in opposite directions, the winding direction of helical leg portion 120A of dead-end clamp 100A and the winding direction of helical leg portion 120B of dead-end clamp 100B will be opposite to each other.

[0034] The wire breakage fall prevention structure and the construction method of the wire breakage fall prevention structure of the present invention are not limited to the above examples, and various modifications and combinations are possible within the scope of the claims and the scope of the embodiments, and these modifications and combinations are also included in the scope of rights.

Claims

1. A structure for preventing an electric wire from breaking and falling, a coil-shaped wire member that can be expanded and contracted while the electric wire is inserted; a dead-end fitting having an annular head and two helical leg portions extending from both ends of the head and capable of being wound around the electric wire for attachment; The two dead-end fittings are attached to the electric wire so that they face in opposite directions and the heads of the dead-end fittings are fixed to each other, A structure for preventing wire breakage and falling, characterized in that the end of the wire member is fixed to the head of the fastening fitting.

2. 2. The structure for preventing wire breakage and falling according to claim 1, wherein the spiral legs of the two end fasteners are wound in opposite directions.

3. At least two of the wires are arranged side by side, The wire breakage and drop prevention structure according to claim 1 or 2, characterized in that it is provided with a connecting rope that connects the head of the fastening fitting attached to one of the electric wires with the head of the fastening fitting attached to the other electric wire.

4. A method for installing the wire breakage and drop prevention structure according to claim 1 or 2.

5. A method for installing the wire breakage and fall prevention structure according to claim 3.

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