JP3881306B2 - How to install the fall prevention net - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a ladder-like electric wire fixing structure (hereinafter referred to as “vertical”) continuously arranged at an angle close to vertical on a steel tower mainly made of steel materials in electrical equipment and telecommunications equipment. If the installation and fixing work of electric wires and cables from the upper part of the tower to the foundation part of the tower is performed along with the ladder) It is related with the method of attaching the fall prevention net | network for preventing a person's fall or the fall of the material or tool at the time of work.
[0002]
[Prior art]
In recent years, there is an urgent need to construct a high-speed and large-capacity information communication network in order to cope with mobile communication such as Internet connection services and mobile phones. For this reason, work is underway to install electrical facilities such as power lines and power lines for wireless telecommunications facilities and related equipment on steel towers. This work involves adding equipment such as antennas to the upper part of the tower and drawing cables such as power lines and power lines from the upper part of the tower to the power control building. Along a vertical ladder (Ladder) for lifting and lowering and a stair for lifting and lowering to a foundation on the ground at an angle close to the vertical, it extends to the power control building. When the cable is lowered to the foundation along the vertical ladder or the like, the cable is laid by striking the vertical ladder or the like from the upper part of the tower to the foundation at intervals of 50 cm along the vertical ladder or the like.
[0003]
Moreover, before laying the cable, it is necessary to attach a fall prevention net to the entire work area at intervals of about 5 m from the upper part of the steel tower to the base part in order to prevent the worker from falling or the material or tool from falling. In this way, the installation interval of the fall prevention net is set to 5 m because the fall speed at the fall will be too fast if the height difference is wide enough, so even if it is received by the fall prevention net, it will be extended by the load of the human body. This is because there is a high possibility that the human body will come into contact with the steel tower structure, and the damage to the worker can be serious and fatal.
[0004]
In addition, the fall prevention net is generally installed by using a vertical ladder, etc., where an operator climbs to the top of the steel tower and attaches it to the foundation at an interval of about 5 m in order from the work position on the top. Do. This fall prevention net is usually formed by knitting a net made of nylon fiber or the like from about 3 m square to about 5 m square, and each apex (square) is similarly provided with a connection string of nylon fiber etc. It is. The worker pulls up the fall prevention net one by one from the ground base to the place where the fall prevention net is installed, or pulls it down to the work table above the tower, etc. Connect to the beams and pillars of the tower structure one by one. This is usually done by spreading one side of the fall prevention net laterally inside the tower (the side where cables such as vertical ladders are routed) and connecting the connecting strings at both ends (two vertices) to the appropriate structure of the tower structure. This is done by tying them to different positions. When the fall prevention net is raised or lowered by the worker or the material or tool is raised or lowered, the fall prevention net is expanded to a range wider than the range where the fall or fall is expected. The slack of the fall prevention net is adjusted to such an extent that sufficient shock absorption is obtained, and the remaining two apex connecting strings are tied to the steel tower structure and fixed as a whole.
[0005]
The reason why we prepared four vertical ropes and installed all the fall prevention nets on the ground at intervals of 5 m in advance, and then installed them one by one on the tower without lifting them all together. Because the beams and braces of the structures that exist in various places of the tower are obstructed, it is impossible to lift with the fall prevention net attached, and the weight of the entire fall prevention net is heavy, and it is difficult to pull it up manually. It is.
[0006]
[Patent Document 1]
Japanese Patent Laid-Open No. 1-249073
[Patent Document 2]
JP 2002-339594 A
[Problems to be solved by the invention]
However, when performing the above-described fall prevention net installation work, the worker himself has a knitting rope attached to the tip of the connecting string, and walks through the vertical ladder etc. through the beams, braces and columns etc. It is necessary to move laterally to the opposite side of the ladder, etc., and to attach the remaining two apex connecting cords with an appropriate slack in the steel tower structure on the opposite side. Since the installation work of the fall prevention net is performed at a high place on the steel tower, triple safety is secured to prevent the fall of the worker. The first of them is to attach one end of the parent net (α) to the top of the steel tower and the other end to the worker. The second is to attach the parent rope (β) attached to the safety belt to the waist before the worker moves sideways. The parent rope (β) has a length that allows lateral movement. The third is to wrap the auxiliary rope (γ) around the waist at the mounting location so that the mounting location is fixed and both hands can be used before attaching the remaining two connection strings after lateral movement. . However, this auxiliary rope (γ) needs to be installed in advance in the lateral movement place.
[0009]
As described above, in order to ensure safety when laying cables such as a power line and a power line, it is necessary to attach a fall prevention net, and conventionally, in order to attach this fall prevention net, further, a parent network (α) It was a very time-consuming and inefficient work because it was necessary to ensure safety using the parent rope (β) and the auxiliary rope (γ).
[0010]
The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a method for attaching a fall prevention net capable of attaching the fall prevention net in a short time.
[0011]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the invention according to claim 1 is a method in which an operator falls or a material or a tool falls before a cable is laid along a ladder or an ascending / descending stairs from an upper part of a steel tower to a foundation part on the ground. In the method of attaching a fall prevention net, the step of suspending a wire rope from the upper part of the steel tower to the foundation part, and two vertical fittings in which the hook fitting is attached in advance by a lifting adjustment fitting Attaching the wire rope to the upper end of the rope, and pulling up the two vertical ropes from the base by lifting the wire rope; and pulling up the fall prevention net to the vicinity of the installation location of the tower, A step of attaching a connection string at the two apexes of the raised fall prevention net to the tower structure on the ladder side of the tower, and the two vertical ropes in front Pulling to the ladder side, connecting the connection cords at the two vertices that have not yet been attached to each hook metal fitting of the pulled-up vertical rope, and fixing the drawing line in the vicinity of the lowermost ends of the two vertical ropes And a step of pulling and fixing the two vertical ropes by using a wire drawing device.
[0012]
Here, as long as two vertical ropes can be pulled up, only one or two or more may be used as the “wire rope” of the present invention (the same applies hereinafter).
[0013]
The invention according to claim 2 is provided with a fall prevention net for preventing a worker from falling or dropping a material or a tool before laying a cable along a ladder or an ascending / descending stairs from an upper part of a steel tower to a foundation part on the ground. In the method of attaching the fall prevention net to be attached, a step of suspending two wire ropes from the upper part of the tower to the foundation part, and the wire ropes at the upper ends of two vertical ropes that have been previously crimped with fasteners. Attaching and pulling up the two vertical ropes from the base to the upper part by pulling up the wire rope, and pulling up the fall prevention net to the vicinity of the installation position of the tower, and two apexes of the raised fall prevention net Attaching the connecting string to the tower structure on the ladder side of the tower, and pulling the two vertical ropes to the ladder side with an operating rod, and it is still attached Connecting each of the two apex connecting strings to the upper side of each fastener of the drawn vertical rope, and using a wire drawing device for fixing the drawing wire in the vicinity of the lowermost ends of the two vertical ropes, And a step of pulling and fixing two vertical ropes.
[0014]
The invention according to claim 3 is the method of attaching a fall prevention net according to claim 1 or 2, wherein the vertical rope is a parent rope used for fall prevention in high-altitude work.
[0015]
The invention according to claim 4 is the method of attaching the fall prevention net according to claim 1 or 2, characterized in that the operation rod can be expanded and contracted in a multistage manner.
[0016]
The invention according to claim 5 is the fall prevention net mounting method according to claim 4, wherein the operation rod is provided with a hook-shaped tip metal fitting for hooking the vertical rope to the tip. .
[0017]
The invention according to claim 6 is characterized in that the lifting adjustment fitting can be attached so as to be freely movable at an arbitrary interval on the vertical rope. This is a method of attaching the net.
[0018]
The invention according to claim 7 is the method of attaching the fall prevention net according to claim 2, wherein the clasp is made of a metal ring and caulked to the vertical rope.
[0019]
DETAILED DESCRIPTION OF THE INVENTION
A first embodiment according to the present invention will be described below with reference to FIGS. 1 to 4 are views showing a method for attaching a fall prevention net and an attachment device according to the present embodiment.
[0020]
As shown in FIG. 1, the steel tower 100 is generally provided with a vertical ladder (A) for raising and lowering workers. The vertical ladder A is a ladder that is used by an operator to move up and down when a cable such as a power line or a power line of a device such as an antenna is dropped from the upper part of the tower 100 to the foundation on the ground. When the cable is lowered to the foundation along the vertical ladder A, the cable is laid by striking the cable from the top of the tower to the foundation along the vertical ladder A at intervals of 50 cm. Moreover, in order to ensure the strength of the steel tower 100, the steel tower 100 is provided with a plurality of beams B from the upper part to the foundation part. Furthermore, the work place C for workers is provided in the upper part of the steel tower. In the steel tower 100 having such a structure, a method for mounting the fall prevention net 4 and a mounting tool will be described below.
[0021]
First, as shown in FIG. 1, a route is selected to pass between each beam B from the work place C on the uppermost stage while considering the installation range of the fall prevention net 4, and the line rope 10 is connected to the ground from the work place C. Two pieces are suspended to the base (in the direction of arrow a) (step S1). The wire rope 10 is a rope having a smaller outer diameter than a vertical rope 1 described later, and an attachment hook 11 for attaching and pulling the vertical rope 1 is provided at the tip.
[0022]
Next, as shown in FIG. 2, the operator attaches a plurality of lifting adjustment fittings 2 and hook fittings 5 at an interval of 5 m in advance according to the height from the work place C to the base portion. Is attached to the attachment hook 11 of the wire rope 10 and pulled up from the base to the top (in the direction of arrow b) (step S2). The two vertical ropes 2 are attached to the two passing ropes 10 and pulled up. As the vertical rope 2, it is necessary to be able to withstand the load at the time of the operator's crash, so the parent rope generally used for preventing the crash at high-altitude work is used. The confirmed connecting hook is provided.
[0023]
Furthermore, the vertical rope 2 is provided with a plurality of lifting adjustment fittings 2 that can be freely moved at arbitrary intervals on the vertical rope 2. As this lifting adjustment fitting 2, a parent rope gripping device such as a fall prevention elevator adapted to the outer diameter of the vertical rope 1 is used, and can be easily attached from the middle of the vertical rope 1 so that the operator can fall. It is suitable to have a rope gripping ability that can sufficiently withstand the impact load of the above and to have a function of easily moving the gripping position by operating the gripping function.
[0024]
Further, each lifting adjustment fitting 2 is attached with a hook fitting 5 by a string or the like, and is devised so that a connection string 6 described later provided at the four corners of the fall prevention net 4 can be easily attached.
[0025]
In addition, when the shape of the tower 100 is expanded so that it falls to the base with the attachment of the fall prevention net 4, the lifting / lowering adjustment fitting 2 not only hangs the vertical rope 1 itself but also the shape of the tower 100. It is also used as a gripping tool for the vertical rope 1 when it is obliquely extended. Further, the tip (lower end) of the vertical rope 1 is wound and accumulated in a state where it can be easily pulled up to a position close to the vertical ladder A where the operator ascends and descends. The load at the time of drawing work can be reduced.
[0026]
Next, the operator pulling the upper direction fall protection network 4 in order to near the mounting location, as shown in FIG. 3, the connection of the two vertices of the vertical ladder A side of the steel tower structure D in fall protection network 4 straps 6 ₁ ties _{6 2} (step S3). This fall prevention net 4 is formed by knitting a net of nylon fiber or the like from about 3 m square to about 5 m square in accordance with the range of work such as cable laying, and each apex (square) is also made of nylon fiber. A connecting string 6 is provided. Further, when connecting the connection strings 6 ₁ , 6 ₂ , since the worker also moves up and down along the work side for laying the cable of the vertical ladder A, the space E that allows the operator's body to pass therethrough. To secure it, tie it with a slack. Furthermore, after the operator passes, a measure such as temporarily trapping the fall prevention net 4 with the vertical ladder A is performed as necessary.
[0027]
Next, as shown in FIG. 3, the operator attaches the master rope type safety belt with the vertical ladder A to prevent the self-falling, and puts the operation rod 3 with the hook-shaped tip metal fitting 7 at the tip. Extending, pulling the vertical rope 1 toward the self side (vertical ladder A side), and connecting the connection strings 6 ₃ and 6 ₄ not yet attached to the hook metal fitting 5 connected to the lifting adjustment metal fitting 2 (step S4). . The operation rod 3 can be expanded and contracted in a multi-stage manner so that an operator can easily carry the vertical ladder A so as not to be hindered when the vertical ladder A is moved up and down, and the large rod shape on which the vertical rope 1 can be easily hooked. A shaped end fitting 7 is provided.
[0028]
The operation for attaching one fall prevention net 4 is completed as described above, and the installation of all the fall prevention nets 4 is completed by repeating this work.
[0029]
Finally, when all the fall prevention nets 4 have been attached, a tensioner 12 is used to fix the vertical rope 1 at a position close to the lowermost end of the vertical rope 1, and the vertical ladder A side is The vertical rope 1 is pulled in an appropriate load in the direction in which the rope 1 is separated (arrow d direction), and is fixed in a state in which the fall prevention net 4 has an appropriate slack (step S5).
[0030]
When it is determined that the installation height of the fall prevention net 4 has a problem such as contact with the steel tower structure when the attachment of the four connection strings 6 of the fall prevention net 4 is realized, the operation rod 3 is used. Fine adjustment of the installation height may be performed by pulling the vertical rope 1 and moving the position of the lifting adjustment fitting 2.
[0031]
Further, when two vertical ropes 1 are pulled up, if the fall prevention net 4 up to a certain height is connected to the height of the tower 100 due to the structure of the steel tower 100, it is possible to pull it up. It is possible to efficiently pull up the prevention net 4 and the vertical rope 1 at the same time.
[0032]
As described above, according to the present embodiment, the vertical rope 1 to which the connection cords 6 ₃ , 6 ₄ at the two vertices of the fall prevention net 4 can be attached is pulled up to the upper part of the steel tower 100, and then the fall prevention net 4 The other two apex connecting cords 6 ₁ , 6 ₂ are attached to the tower structure D of the tower 100, and then the vertical rope 1 is pulled to the vertical ladder A side (arrow c side) with an operating rod, and then the connecting string 6 _3, attached 6 ₄ to hook fitting 5 on the installed lift adjustment bracket 2 perpendicularly rope 1. As a result, as in the prior art, the worker secures safety using the parent net (α), the parent rope (β), and the auxiliary rope (γ), and then, from the vertical ladder, the beam, bracing, pillars, etc. Since there is no need to walk through and move laterally to the opposite side of the vertical ladder, the fall prevention net can be attached in a short time.
[0033]
[Second Embodiment]
The second embodiment according to the present invention will be described below with reference to FIG. In addition, FIG. 5 is the figure which showed the attachment method and attachment fixture of the fall prevention net | network concerning this embodiment.
[0034]
In the present embodiment, the fall prevention net 4 is basically attached by the same operation procedure as that of the first embodiment, but the instruments used are different. That is, the vertical rope 1 ′ obtained by caulking the clasp 8 made of a metal ring every 5 m or at a finer interval is used. With this clasp 8, the connecting rope 6 connected from the four corners of the fall prevention net 4 by giving the outer diameter difference by caulking so as not to hinder the transportation and pulling of the vertical rope 1 ′ itself. _When the connecting hook 9 attached to the tip of ₃ ', 6 ₄ ' is attached to the vertical rope 1 ', it is prevented from sliding down from the upper end of the clasp 8 to the lower part. The connecting hook 9 can freely rotate about the vertical rope 1 ′, and an inner diameter that allows the outer diameter of the vertical rope 1 ′ to be easily inserted but cannot pass through the outer diameter of the clasp 8 is formed. It is a connecting device such as a hook or a carabiner, and is attached to each end of the connecting cords 6 ₃ ′ and 6 ₄ ′ at the two apexes of the fall prevention net 4 ′. Since it is the same structure except this, the same code | symbol is attached | subjected and description is abbreviate | omitted.
[0035]
In addition, the installation work of the fall prevention net 4 ′ in the present embodiment is different only in the above step S4, and therefore, only the different steps will be described. That is, as shown in FIG. 5, the operator extends the operation rod 3 with the hook-shaped tip metal fitting 7 at the tip in a state in which the master rope type safety belt is attached with the vertical ladder A and the self-falling is prevented. Then, the vertical rope 1 is pulled toward the self side (vertical ladder A side), and the connecting hook 9 is attached to the vertical rope 1 'portion on the upper side of the clasp 8, and the connecting cords 6 ₃ ', 6 that are not attached are attached. ₄ 'is connected (step S4'). Thereby, the work of attaching one fall prevention net 4 ′ is completed, and by repeating this work, the attachment of all the fall prevention nets 4 ′ is completed.
[0036]
As described above, according to the present embodiment, instead of the lifting adjustment fitting 2 and the hook fitting 5 in the first embodiment, only the clasp 8 is attached to the vertical rope 1 ′. In addition to the effect of the embodiment, when pulling up the vertical rope 1 ′, there is an effect that the vertical rope 1 ′ is not caught by a beam or a brace of the steel tower 100.
[0037]
The connecting hook 9 may be omitted and the connecting rope 6 may be directly connected to the vertical rope 1. In this case, although a little time is required for attachment, the presence of the clasp 8 makes it possible to attach the fall prevention net 4 ′ that does not easily fall down even when an impact load is applied during the fall.
[0038]
Moreover, although the fall prevention net | network 4 (4 ') can be implemented in the work range which continues in the vertical direction of the steel tower 100 in the procedure (step) in the said 1st and 2nd embodiment, this attachment method is a vertical rope. The present invention can be applied to installation of a fall prevention net in a continuous work range of a structure inclined by the route of 1 (1 ′) and the shape of the steel tower 100.
[0039]
Furthermore, although each said embodiment demonstrated the case where an operator raises / lowers using the vertical dollar A, it is not restricted to this, The case where it raises / lowers using the raising / lowering stairs may be sufficient.
[0040]
【The invention's effect】
As described above, according to the present invention, the vertical rope to which the two connecting cords (6 ₃ , 6 ₄ ) of the fall prevention net can be attached is raised to the upper part of the steel tower, and then the other fall prevention net Attach the connection cord (6 ₁ , 6 ₂ ) at the top of the tower to the tower structure of the tower, then pull the vertical rope toward the ladder such as the vertical ladder with the operating rod, and then connect the connection cord (6 ₃ , 6 ₄ ) Attach it to the hook fitting of the lifting adjustment fitting attached to the vertical rope. This eliminates the need for the worker to walk from the ladder through beams, braces, and pillars to the opposite side of the ladder, so that the fall prevention net can be installed in a short time. Play.
[Brief description of the drawings]
FIG. 1 is a view showing a method for attaching a fall prevention net and a fixture according to a first embodiment of the present invention.
FIG. 2 is a view showing a method for attaching a fall prevention net and an attachment device according to the first embodiment of the present invention.
FIG. 3 is a view showing a method for attaching a fall prevention net and an attachment device according to the first embodiment of the present invention.
FIG. 4 is a view showing a method for attaching a fall prevention net and an attachment device according to the first embodiment of the present invention.
FIG. 5 is a view showing a method for attaching a fall prevention net and an attachment device according to a second embodiment of the present invention.
[Explanation of symbols]
1 (1 ') Vertical rope 2 Lifting adjustment fitting 3 Operation rod 4 (4') Fall prevention net 5 Hook fitting 6 Connection string 7 Tip fitting 8 Fastening fitting 9 Connection hook 10 Wire rope 11 Mounting hook 12 Tension wire 100 Steel tower A Vertical ladder B Beam C Work place D Space

Claims (7)

In the installation method of the fall prevention net which attaches the fall prevention net which prevents the fall of the worker or the material or the tool before laying the cable along the ladder or the stairs for raising and lowering from the upper part of the steel tower to the ground base ,
Suspending two wire ropes from the top of the tower to the foundation;
Step of pulling up the two vertical ropes from the base to the upper part by attaching the wire rope to the upper ends of the two vertical ropes to which the hook metal fitting is previously attached by the lifting adjustment metal fitting and pulling up the wire rope When,
The step of pulling up the fall prevention net to the vicinity of the installation location of the tower, and attaching the connection cord at the two apexes of the raised fall prevention net to the tower structure on the ladder side of the tower;
Pulling the two vertical ropes to the ladder side with an operating rod, and connecting each of the two apex connecting strings not yet attached to each hook metal fitting of the pulled vertical rope;
Pulling and fixing the two vertical ropes using a wire drawing device that fixes the drawing wire in the vicinity of the lowermost ends of the two vertical ropes;
A method of mounting a fall prevention net, characterized in that In the installation method of the fall prevention net which attaches the fall prevention net which prevents the fall of the worker or the material or the tool before laying the cable along the ladder or the stairs for raising and lowering from the upper part of the steel tower to the ground base ,
Suspending two wire ropes from the top of the tower to the foundation;
Attaching the wire rope to the upper ends of two vertical ropes that have been previously crimped with fasteners, and pulling the two vertical ropes upward from the base by pulling up the wire rope;
The step of pulling up the fall prevention net to the vicinity of the installation location of the tower, and attaching the connection cord at the two apexes of the raised fall prevention net to the tower structure on the ladder side of the tower;
Pulling the two vertical ropes to the ladder side with an operating rod, and connecting the connection vertices of two vertices that have not yet been attached to the upper side of each fastener of the pulled vertical ropes;
Pulling and fixing the two vertical ropes using a wire drawing device that fixes the drawing wire in the vicinity of the lowermost ends of the two vertical ropes;
A method of mounting a fall prevention net, characterized in that The method for attaching a fall prevention net according to claim 1 or 2, wherein the vertical rope is a parent rope used for fall prevention in high-altitude work. The method for attaching a fall prevention net according to claim 1 or 2, wherein the operation rod is extendable and retractable in a multistage manner. The method of claim 4, wherein the operation rod is provided with a hook-shaped tip metal fitting for hooking the vertical rope to the tip. The method for attaching a fall prevention net according to claim 1, wherein the elevating metal fitting can be attached so as to be freely movable at an arbitrary interval on the vertical rope. The method according to claim 2, wherein the clasp is made of a metal ring and caulked to the vertical rope.

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