JP2009247126A - Personnel safety net - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a personnel safety net that prevents falling of a component or a tool certainly. <P>SOLUTION: A personnel safety net 1 includes a net 2 formed large enough to surround a power line 30 laid on the overhead wire arm portion 32 of an overhead wire tower 31 from the underside to the opposite sides, a wire fastening fitting 4 connected with the front end of the net 2, and a rear fixing member provided in the rear of the net 2 and connected with the steel tower 31. A lateral rod material 5 is arranged in the lateral direction intersecting the power line 30, and the front end of the net 2 is secured to the lateral rod material 5 in a developed state. A working ladder 36 stretched between the overhead wire tower 31 and the power line 30 or net extension rods 20 and 22 secured to the overhead wire tower 31 are also provided. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a fall prevention net for preventing parts and tools from dropping onto the ground during power line inspection and maintenance work.

Power lines installed on overhead towers such as steel towers and utility poles are regularly inspected, and at that time, repairs and exchanges of equipment and parts attached to the power lines are performed. Overhead construction is performed on the tower, so parts and tools may be accidentally dropped. It is difficult to eradicate fallen objects during such overhead wire construction, and at present, it depends largely on the skills of individual workers who do not generate fallen objects, but it is impossible to prevent the occurrence of fallen objects due to human error.
Therefore, measures have been taken to collect fallen objects by extending a net body under the overhead tower, which is located below the power line.

Japanese Patent Laid-Open No. 7-155656 (paragraph [0021], FIG. 3 and FIG. 6)

However, as described above, the net body stretched at the bottom of the overhead line tower is away from the power line in the height direction, so fallen objects hit the tower body in the middle and jumped in any direction, preventing fall. Sometimes useless. In addition, since the fall point cannot be predicted, there was a risk of causing a great social impact.
In addition, as a related technique, a technique in which a net body is stretched at a position below the overhead line arm portion of the overhead tower and the foreign matter and paint removed from the tower body and the overhead line arm portion are received is described in Patent Document 1 described above. ing. However, the technique disclosed in the above-mentioned document only collects foreign matter and paint at the time of painting the tower main body and the overhead arm, and cannot reliably receive parts or tools dropped from around the power line.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a fall prevention net that can reliably receive parts, tools, and the like that have been dropped during overhead wire construction.

  In order to achieve the above-mentioned object, a fall prevention net according to the present invention is connected to a net body formed in a size surrounding a power line installed in an overhead tower from below to both sides, and a front end portion of the net body. An electric wire fixing metal fitting and a rear attachment member provided at the rear part of the net body and connected to an overhead wire tower are provided.

  Moreover, in the said structure, while providing the horizontal saddle member arrange | positioned in the horizontal direction which cross | intersects a power line, it is being fixed to the said horizontal saddle member in the state which the front-end part of the net | network body expand | deployed.

  And in each above-mentioned structure, the opening part for unloading is formed in a net | network body, and the opening-and-closing member which closes this opening part so that opening and closing is possible is provided.

  Further, in each of the above-described configurations, a work ladder spanned between the overhead tower and the power line or a net extension housing fixed to the overhead tower is provided.

  According to the fall-preventing net according to the present invention, the rear mounting member provided at the rear part of the net body, in which the wire fixing metal fitting connected to the front end of the net body is fixed to the power line at an appropriate distance from the overhead tower. Is connected to the overhead tower, so that the net body is arranged so as to surround the power line and overhead wire parts from below and on both sides. Therefore, even when an operator accidentally drops replacement parts, small parts such as bolts and nuts, or tools, these can be reliably received by the net body immediately below.

  In addition, for those equipped with a horizontal frame that fixes the front end of the net body in an unfolded state, shorten the length from the front end of the net body to the wire fixing bracket, It can be configured compactly.

  And in the thing which equips the net body with the opening part for unloading and the opening-and-closing member which opens and closes this, an old part and a tool can be lifted and lowered through the opened opening part.

  Furthermore, the net body can be widely extended if it is provided with a net extension housing. Therefore, it is possible to prevent parts from falling over a wide range.

The best embodiment of the present invention will be described with reference to the drawings. The embodiment described below is merely an example embodying the present invention, and does not limit the technical scope of the present invention. FIG. 1 is a bottom view of a fall prevention net according to an embodiment of the present invention.
In the figure, a fall prevention net 1 according to this embodiment is fastened and fixed with a net body 2 formed of, for example, a mesh of 9 mm or less using, for example, polyester yarn, and a tip portion of the net body 2 being unfolded. For example, nylon provided on each side of the rear portion of the net body 2 and the wire fixing metal fitting 4 connected to the horizontal frame member 5 via a plurality of connecting members 3 made of, for example, nylon rope. Rope rear mounting members 12, 12, 13, and 13 are provided. The horizontal gutter member 5 has a length of about 1.2 m, for example, and is made of, for example, a pipe made of polyvinyl chloride.

  The net body 2 has a longitudinal length of, for example, 5.5 m and a lateral width of the rear side of, for example, 5 m. Incidentally, if the left and right width of the rear side of the net body 2 is about 2.5 m on one side, it is possible to surround both sides from the lower side of the power line 30 and the work ladder 36 with a margin in a U shape. A notch 10 is formed in the left and right central part of the rear side of the net body 2. The notch 10 communicates with an opening 11 for unloading formed in the center portion of the net body 2. A U-shaped kinkaku portion 17 is suspended from the periphery of the opening 11 in plan view. A plurality of ring portions 18, 18, 18,... Are attached to the lower edge portion of the kinkaku portion 17 at appropriate intervals in the circumferential direction. Through these ring portions 18, 18, 18,..., An opening / closing wire 19 made of, for example, nylon rope is passed. An opening / closing member 38 that closes the opening 11 so as to be freely opened and closed is constituted by the ring portions 18, 18, 18,. Locking members 15, 15, 15 are provided on one opposing side of the notch 10. Locking members 16, 16, 16, which are detachably engaged with the locking members 15, 15, 15, are disposed on the other opposing side of the notch 10 facing the locking members 15, 15, 15. Is laid. These locking members 15 and 16 are realized by, for example, hook-shaped portions and loop portions of a hook-and-loop fastener.

  Folded portions are formed on the left and right side portions of the net body 2, and the edge strips 6 and 6 are passed through the folded portions to reinforce the border. A folded portion is also formed on the rear side portion of the net body 2, and edging lines 7 and 7 are passed through the folded portion to reinforce the border. Through the planar portion of the net body 2, the front and rear through threading lines 8, 8, 8, 8, 8, 8 and the left and right direction through thread 9, 9 are passed. Due to the presence of these edging wire strips 6 and 7 and through-through wire strips 8 and 9, the shape retaining property that can surround the power line 30 without being deformed by some wind, and the insulated wire bracket 34, etc. Strength that does not break when dropped is given.

  For example, nylon rope rear attachment members 12, 12 are connected to both sides of the rear end of the opening 11 in the net body 2. These rear attachment members 12 and 12 may be configured integrally with the through-wire 9 or may be configured separately. For example, nylon rope rear attachment members 13, 13 are connected to the rear end side portions 2A, 2B of the rear side of the net body 2. For example, nylon rope-made fastening strips 14 and 14 are connected to the rear corners of the notch 10 in the net body 2. These rear mounting members 13 and 13 or fastening wire strips 14 and 14 may be formed integrally with the rimming strip wire 7 or may be formed separately.

  As shown in FIG. 2, the wire fixing metal fitting 4 includes a swinging member 23 and a swinging member 24 that are swingably connected via a hinge bolt 25. A connecting plate 27 is inserted through the tip of the hinge bolt 25, and a nut 26 is screwed. Thereby, the connecting plate 27 is held between the side surface of the swing member 23 and the nut 26. The power line 30 is clamped and fixed between the clamping surface 44 that is the inner surface of the swinging member 23 and the clamping surface 43 of the swinging member 24 that faces the clamping surface 44. These clamping surfaces 43 and 44 have a structure that does not damage the clamped power line 30. The swing member 23 is provided with a pivot shaft 41 parallel to the hinge bolt 25, and a fastening bolt 28 is pivotally supported on the pivot shaft 41. A washer 40 is inserted into the tightening bolt 28, and a nut 29 is screwed to the tip of the tightening bolt 28. Then, the clamping bolts 28 are swung so that the washer 40 is hooked on the bank portion 42 protruding from the rocking side end surface of the rocking member 24 and the nut 29 is tightened, whereby the clamping surfaces 43 and 44 are moved. The power lines 30 are tightened close to each other. A connecting tool 45 such as a carabiner is attached to the connecting hole at the tip of the connecting plate 27, and the connecting member 3 from the horizontal frame member 5 is connected to the connecting tool 45.

  As shown in FIG. 3, the fixing member 21 includes a U-shaped main body 46 formed of U-shaped steel or the like, and a holding cylinder connected to a side surface of the U-shaped main body 46 via an angle adjusting mechanism 49. A portion 48 and fastening bolts 47, 47 that are screwed into female screw holes 53, 53 formed on the upper surface of the U-shaped main body 46. The holding cylinder portion 48 is fixed with the housing 20 for net expansion. A part of the work ladder 36 is inserted between the upper and lower surfaces of the U-shaped main body 46 and is fastened and fixed by fastening bolts 47 and 47. The net extension housing 20 is fixed to the work ladder 36 spanned between the overhead tower 31 and the power line 30 via the fixing member 21. In addition, the net extension housing 22 is fixed to the overhead arm 32 of the overhead tower 31 via the fixing member 21.

Next, the operation of the fall prevention net 1 configured as described above will be described.
As shown in FIGS. 4 to 6, the overhead tower 31 to which the fall prevention net 1 is applied is a truss-structured steel tower, for example, and has a plurality of overhead arm portions 32 on which the power line 30 is constructed. A connecting portion 33 for connecting an insulated overhead wire fitting 34 such as an insulator is provided at the tip of the overhead wire arm portion 32. A clamp 35 that holds the power line 30 is connected to the tip of the insulated overhead wire fitting 34.
Therefore, the worker attaches a pulley 50 (see FIG. 7) to the overhead wire arm portion 32 above the overhead wire arm portion 32 on which the power line 30 to be constructed is installed, and passes the work ladder 36 to the rope 51. Lift it up with. The work ladder 36 is obliged to be used when working on the tower, but its end is fixed to the overhead wire arm 32 and the tip is suspended and supported on the power line 30 by the suspension member 37. Then, the operator puts the fall prevention net 1 into the storage container 52 connected to one end of the return rope 51, pulls up the return rope 51, and lifts the storage container 52 on the tower. Thereafter, the return rope 51 is pulled upward from the extended position of the fall prevention net 1.

Therefore, a mode in which the two fall prevention nets 1 and 1 are extended will be described. First, it extends from the left fall prevention net 1 toward FIG. The operator clamps the rocking members 23 and 24 of the wire fixing bracket 4 on the power line 30 at a position away from the tip of the work ladder 36 and tightens the nut 29 to fix the wire fixing bracket 4 to the power line 30. To do. Thereafter, the horizontal frame member 5 and the net body 2 are arranged below the power line 30 and the rear part of the net body 2 is drawn closer to the overhead arm part 32. Then, the horizontal frame 5 is directed in the horizontal direction substantially orthogonal to the power line 30. Thereafter, the locking members 15, 15, 15 and the locking members 16, 16, 16 are fastened, and the fastening lines 14, 14 on both sides are fastened.
Subsequently, the operator attaches the rear attachment member 13 on the side farther from the overhead wire arm portion 32 (rear end side portion 2A) to the upper overhead wire arm portion 32, and attaches the rear portion on the closer side (rear end side portion 2B). The member 13 is connected to the overhead tower 31 through the lower side of the overhead arm 32. Further, the rear mounting member 12 on the side far from the overhead wire arm portion 32 is tied to the tip of the net extension housing 22, and the near rear mounting member 12 is tied to the overhead tower 31 through the lower side of the overhead wire arm portion 32. Subsequently, the net extension housing 20 is attached to the vicinity of the tip of the working ladder 36 using the fixing member 21. The net body 2 is stretched by hooking a side portion of the net body 2 to the tip of the net-stretching housing 20. At that time, the net extension housing 20 and the net body 2 are firmly fastened so that the net body 2 does not come off due to the wind.

  Then, the right fall prevention net 1 is extended toward FIG. 4, and the same work as the extension work of the left fall prevention net 1 described above is sequentially executed in the left-right reverse direction. In addition, the rear part of the right fall prevention net 1 is overlapped with the rear part of the right fall prevention net 1 and extended. That is, the rear attachment member 13 of the rear end side portion 2B (broken line 2B in FIG. 4) of the right fall prevention net 1 is tied to the net extension housing 22, and the rear end side portion 2A (dashed line 2A in FIG. 4). The rear mounting member 13 is connected to the overhead tower 31. Thereby, the expansion work of the two fall prevention nets 1 and 1 is completed. Then, when performing operations such as overhead wire inspection, repair, replacement, etc., the opening / closing wire 19 of the opening / closing member 38 is previously squeezed to close the kinchaku portion 17 (state of FIG. 4).

  Therefore, when exchanging the insulated overhead wire fitting 34 and the clamp 35 such as the insulator series, the operator removes the power line 30 from the clamp 35 and integrally attaches the clamp 35 and the insulated overhead wire fitting 34 from the connection portion 33 of the overhead wire arm portion 32. Remove. Thereafter, it is confirmed whether or not any parts are dropped on the net body 2, and if there are any parts, they are stored in the storage container 52.

  Then, the operator loosens the opening / closing member 38 and opens the opening 11 of the kinkaku portion 17 (see FIGS. 7 and 8). Then, the old clamp 35 and the insulated overhead wire 34 that have been removed are connected to the rope 51 and lowered from the opening 11 to the ground. At this time, the storage container 52 containing the components and the like is also preferably tied to the go through 51 and lowered. Then, after the new clamp 35 and the insulated overhead wire 34 are connected to the rope 51 and unloaded, the opening and closing member 19 of the opening and closing member 38 is squeezed to close the kinchaku portion 17. Thereafter, the unloaded clamp 35 and the insulated overhead wire fitting 34 are attached to the connection portion 33.

  In the fall prevention net 1 having the above-described configuration, the net body 2 has a mesh, so that it is difficult to receive wind pressure and can see the boarding work from the ground. Further, since the net body 2 absorbs an impact, even if a fallen object falls on the net body 2, it does not jump, and even if the entire fall prevention net 1 falls, it is difficult to damage the fall destination. Since the net body 2 has a mesh of 9 mm or less, the net body 2 can be reliably received without passing the overhead wire tower 31 and the bolts and nuts used for the overhead wire work. Moreover, since the net body 2 is made of polyester, it has insulating properties and high strength. Therefore, it can withstand the drop (drop distance 3 m) of the overhead wire fitting 34 such as an insulator series of about 50 kg. And since the fall prevention net | network 1 is about 25 kg in total, it is the weight which can be handled on a tower.

  In particular, in the fall prevention net 1, the power line 30, the clamp 35, the insulated overhead wire fitting 34, the work ladder 36, and the like are positioned directly below the both sides from the lower side so as to be surrounded in a substantially U shape in a side view. Since the net body 2 is arranged, even if an operator accidentally drops a replacement part, a small part such as a bolt or nut, or a tool, these are received by the net body 2 immediately below and are received on the ground. Never fall. That is, there is no possibility of an unexpected accident in which the dropped parts hit the tower of the overhead tower 31 and jump off. Furthermore, the net body 2 is also disposed below the overhead arm portion 32.

  Moreover, since the fall prevention net 1 is provided with the net extension case 20 and the net extension case 22, the net body 2 can be extended widely. Thereby, fall prevention of components etc. can be aimed at over a wide range. And since the horizontal gutter 5 is provided, it is needless to say that the front end of the net body 2 can be reliably extended, and the length of the connecting member 3 from the front end of the net body 2 to the wire fixing bracket 4 is shortened. can do. That is, the longitudinal length of the entire fall prevention net 1 can be shortened. Incidentally, in order to keep the current width of the front end of the current net body 2 to 1.2 m when the horizontal frame 5 is not used, a strip several times longer than the connecting member 3 must be used. Further, since the distance from the work ladder 36 and the overhead wire arm portion 32 to the wire fixing bracket 4 is shortened, the fixing operation of the wire fixing bracket 4 to the power line 30 becomes safe and easy. Further, since the opening 11 and the opening / closing member 38 of the net body 2 are provided, it is a matter of course that the work can be performed with the opening 11 closed at the time of inspection, repair, and replacement. There is an advantage that a new replacement part or tool can be unloaded or an old part after unloading can be unloaded through the opening 11 opened by loosening 19.

In the above-described embodiment, an example in which the fall prevention net is applied to a triangular shape in plan view as the overhead line arm portion of the overhead line tower is shown, but the present invention is not limited thereto, and for example in plan view. The present invention can also be applied to an overhead wire arm portion having a square shape or other shapes.
In the above description, the opening / closing member for opening and closing the opening of the net body is constituted by a large number of ring portions provided at the opening edge of the kinchaku portion and the opening / closing line through the ring portion. The members are not limited to these configurations.
The overhead tower referred to in the present invention includes not only the above-described truss-structured steel tower but also a utility pole installed in an urban area, for example. In this case, for example, if the fall prevention net of the present invention is applied to a utility pole at a position adjacent to a traffic signal, damage caused by a fallen object on a signal waiting vehicle can be prevented.

It is a bottom view of the fall prevention net concerning one embodiment of the present invention. The electric wire fixing metal fitting of the said fall prevention net is shown, (A) is a top view, (B) is an external view. It is an external view which shows the fixing member of the casing for net extension of the said fall prevention net. It is a top view which shows the aspect which extended two of the said fall prevention nets below a power line and an overhead wire arm part. It is a side block diagram corresponding to FIG. It is a front block diagram corresponding to FIG. It is a side block diagram which shows the state which opened the opening part of the fall prevention net corresponding to FIG. FIG. 8 is a bottom view corresponding to FIG. 7.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Fall prevention net 2 Net body 3 Connecting member 4 Electric wire fixing metal fitting 5 Horizontal mounting member 11 Opening part 12 Rear part attaching member 13 Rear part attaching member 17 Kinchaku part 18 Ring part 19 Opening and closing wire 20 Net extension body 21 Fixing member 22 Net extension frame 30 Power line 31 Overhead tower 32 Overhead arm portion 36 Ladder for operation 38 Opening and closing member

Claims (4)

A net body formed in a size that encloses a power line installed on the overhead line tower from below to both sides, a wire fixing metal fitting connected to the front end of the net body, and a rear part of the net body. A fall prevention net comprising a rear mounting member connected to the head. The fall prevention net according to claim 1, further comprising a horizontal frame member arranged in a lateral direction intersecting with the power line, and fixed to the horizontal frame member in a state where a front end portion of the net body is unfolded. The fall prevention net according to claim 1 or 2, further comprising an opening / closing member that forms an opening for unloading in the net body and closes the opening freely. The fall prevention net according to any one of claims 1 to 3, further comprising a work ladder spanned between the overhead line tower and the power line, or a net extension housing fixed to the overhead line tower.

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