JP7274378B2 - Steel tower work scaffolding - Google Patents

Description

The present invention relates to a steel tower work scaffold called an overhead wire ladder, which is used by fixing to a cross arm of a steel tower when performing maintenance and inspection work on the power transmission line on the upper part of the steel tower.

2. Description of the Related Art Conventionally, an overhead wire ladder has been used in a steel tower of a power transmission line when performing maintenance and inspection work on the power transmission line, the insulator string, or the like. Attach the rear end of such an overhead wire ladder to the cross arm at the top of the steel tower, extend the wire member or rod-shaped member from the tip, hook it to the power transmission line or insulator string suspended on the steel tower, are carrying out maintenance and inspection work on transmission lines, etc.

However, if the existing electric wire, which is a transmission line, has a small diameter, it may not be possible to apply the load of the overhead wire ladder. In addition, if an electric current accidentally flows through an existing electric wire, there is a risk of electric shock to a worker, which is dangerous. Therefore, an overhead wire ladder has been developed in which the load of the overhead wire ladder is not applied to the existing transmission line.

As such an overhead wire ladder, there is an overhead wire ladder described in Patent Document 1. This overhead wire ladder is supported by overhead wire ladder fixtures consisting of cross arm side fixing brackets, supporting rods and ladder side fixing brackets suspended from cross arm steel materials at approximately the center on both sides of the overhead wire ladder. The rear end is supported on cross arm steel using a ladder fixing aid.

This overhead wire ladder has a structure in which the installation position and inclination angle of the wire ladder can be adjusted, and when performing maintenance and inspection of the power transmission line, it is possible to work in the correct posture without strain, so that the work can be done safely. Moreover, since the overhead wire ladder does not sway, it becomes easier to work on the outside of the steel tower. In this way, the overhead wire ladder can be fixed to the lower position of the cross arm, and maintenance and inspection work such as insulator replacement and overhead wire fitting inspection/repair can be carried out safely and quickly, as well as transmission line opening/closing work. That's what it means.
JP 2011-188659 A

However, in the overhead wire ladder of Patent Document 1, the approximate center of both sides of the overhead wire ladder is suspended on the cross arm steel material using the wire ladder fixture, and the rear end is suspended using the ladder fixing aid. It is hooked to the cross arm steel material, and by this, the overhead wire ladder is suspended from the cross arm steel material at three points. Moreover, the tip of this overhead wire ladder is not supported. It is unstable for a worker to work on the overhead wire ladder suspended at three points in this way.

In addition, since the overhead wire ladder is suspended from above using the wire ladder fixing fittings, the wire ladder can only be installed when there is a cross arm steel material or the like above. That is, if there is no cross arm steel or the like above, this overhead wire ladder cannot be installed, and the place where this overhead wire ladder is installed is limited. In addition, it cannot be suspended below the insulator strings or transmission lines leading out from the left and right of the cross arm of the steel tower.

The present invention has been made in view of these points. By fixing the surface composed of the strut to the side surface of the cross arm, and by connecting and supporting the tip of the scaffold material and the upper end of the strut via a branch line, even if there is no cross arm or the like above, To solve the above problems by providing a steel tower work scaffold which can be securely supported and fixed to a cross arm or the like.

According to the first aspect of the invention, there is provided a working scaffold erected for maintenance and inspection of an insulator string near the tip of a cross arm of a steel tower and a transmission line, wherein the working scaffold is detachably fixed to the cross arm. and a scaffold material whose base end is detachably fixed to the jig and whose tip protrudes downward from the power transmission line and the insulator string. A scaffold material fixed with a plurality of cross bars, the two supports of the jig being fixed to the cross arm main member and the cross arm hanging member on one side of the cross arm, and the base end fixed to the jig. A scaffolding for working on a steel tower is provided by stretching a branch line from the top end of the jig to the upper end of the jig and stretching a branch line from the upper end of the jig to a member on the other side of the cross arm.

According to a second aspect of the invention, there is provided a work scaffolding for a pylon according to claim 1, wherein the two pillars of the jig are provided with cross-arm main material hooks for hooking on the cross-arm main material of the cross-arm.

According to the third aspect of the invention, the scaffolding material is fixed to the jig by attaching a scaffolding hook with an opening facing upward to the lower end of each of the supports of the jig or to the horizontal beam that spans the lower part of the support. Two pieces are provided at intervals, and a crosspiece provided near the base end of the scaffolding material is hooked from above on the scaffolding hook, and the upper surface of the base end outside the crosspiece of the scaffolding material is the lower end of each of the posts or The scaffolding for steel tower work according to claim 1 or 2, wherein the scaffolding is superimposed on the lower surface of the cross beam.

In the invention of claim 4, the opening of each scaffolding hook is provided with a hook lid lever that always closes each opening, and each hook lid lever is installed from below the opening of the scaffolding hook. 4. The steel tower according to claim 3, wherein the opening of the scaffolding hook is opened when the upper end of each hook lid lever is pulled up against the force of the spring. used as a working scaffold.

The invention of claim 5 is the work scaffold for a steel tower according to any one of claims 1 to 4, wherein an auxiliary branch line is stretched from the tip of the scaffold material toward the cross arm in a V shape in plan view. bottom.

According to the inventions of claims 1 and 2, the working scaffold can be reliably and stably provided without hooking the leading end of the working scaffold on the power transmission line, the insulator string, or the like. That is, a scaffold for work is formed in an L shape by a ladder-shaped scaffolding material and a jig consisting of two upright pillars, and a surface composed of two pillars forming the vertical side of the L shape is formed. The ends of the scaffolding materials that are fixed to four sides of the cross arm and form the horizontal sides of the L-shape are connected to the upper end of the pillar via a branch line, and the end of the branch line is connected to the upper end of the pillar. By connecting and supporting the cross arm, the scaffolding material can be securely and stably supported and fixed to the cross arm even if there is no cross arm or the like above. Therefore, compared with the wire ladder of Patent Document 1, it can be stably fixed to a cross arm or the like, and the range of use is greatly expanded, which makes it useful.

According to the third aspect of the invention, the scaffolding material is fixed to the jig by providing a scaffolding hook on the lower end of each of the supports of the jig or on the horizontal beam that spans the lower part of the support. A crosspiece provided near the end is hooked on the scaffolding hook from above, and the base end upper surface of the outer end of the crosspiece of the scaffolding material is overlapped with the lower end of each of the columns or the lower surface of the horizontal crosspiece. Even if the scaffold member tries to rotate around the crosspiece, the upper surface of the base end of the scaffold material is restrained by the lower end of the column or the lower surface of the horizontal crosspiece, thereby preventing unnecessary movement of the scaffold material. In this manner, the jig fixed to the side surface of the cross arm and the scaffolding material can be connected to form and maintain an L-shape, and the reliability of the working scaffolding is high.

According to the fourth aspect of the invention, the scaffolding hook is provided, the opening of which is always closed by the hook lid lever. You can't get off the hook blindly. Therefore, since the connection between the jig and the scaffolding material is reliably maintained, the scaffolding for work is highly reliable.

Furthermore, according to the fifth aspect of the invention, since the auxiliary support wire is stretched from the tip of the scaffolding toward the cross arm in a V-shape in a plan view, the scaffolding does not unnecessarily sway, and the work is carried out. Workers on the scaffold can work with peace of mind.

FIG. 2 is a partial plan view of the working scaffold according to Embodiment 1 of the present invention in a state in which it is installed on a cross arm; 1 is a front view of a jig for a working scaffold according to Embodiment 1 of the present invention; FIG. 1 is a side view of a jig for a working scaffold according to Embodiment 1 of the present invention; FIG. FIG. 2 is a partial perspective view of the lower portion of the jig of the working scaffold according to Embodiment 1 of the present invention; FIG. 2 is a partial side view of a state in which an opening is opened by pulling up a rope of a scaffolding hook at a lower portion of a jig for a scaffolding according to Embodiment 1 of the present invention; 1 is a partial front view of a working scaffold according to Embodiment 1 of the present invention attached to a cross arm; FIG. FIG. 2 is a partial side cross-sectional view of a state in which a crosspiece of a cording ladder is hooked on a scaffolding hook of a jig of a working scaffolding according to Embodiment 1 of the present invention, and a section between columns arranged side by side is cut; Fig. 2 is a side view of the working scaffold according to Embodiment 1 of the present invention attached to a cross arm; Fig. 2 is a partial plan view of a state in which work scaffolds according to Embodiment 1 of the present invention are attached to both side surfaces of cross arms; 1 is a partial cross-sectional side view of a state in which work scaffolds according to Embodiment 1 of the present invention are attached to both side surfaces of cross arms; FIG.

(Embodiment example 1)
Hereinafter, a working scaffolding A for a steel tower (hereinafter simply referred to as "scaffolding A") according to Embodiment 1 of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 8, the scaffolding A of the first embodiment includes a jig 1 detachably fixed to the side surface of the cross arm C of the steel tower B, and a base end detachably attached to the jig 1. , and the tip end thereof is connected with a wire ladder 10 which is a scaffold material protruding downward from the transmission line D and the insulator string E to form an L shape.

As shown in FIGS. 2 and 3, the jig 1 consists of a post 2 consisting of two square pipes erected with a space between them and two horizontal beams (from the top, an upper long bolt 3 and a middle long bolt 4). ) are provided and fixed, and eyebolts 6 are provided on the upper front and rear surfaces of the two supports 2 of this jig 1, respectively.

In addition, on the front surfaces slightly above the lower portions of the two pillars 2, there is provided a downward cross-arm main material hook 7 for hooking on the cross-arm main material C1 of the cross-arm C. As shown in FIG. This hook 7 for cross arm main material is prepared by preparing two mounting plates 7a, and is mounted by screwing a bolt 7b to the rear surface of one of the mounting plates 7a. , and these two mounting plates 7a are screwed together with bolts 7c and nuts 7d, respectively, and fixed to each support 2. As shown in FIG.

Further, as shown in FIG. 4, scaffolding hooks 8 are provided at the lower ends of the two posts 2, respectively. These scaffolding hooks 8 are formed by extending each corner of a flat U-shaped holding portion 8c and opposite side plates of the holding portion 8c to form upward openings 8a. The lower ends of the posts 2 are fitted into the holding portions 8c of the scaffolding hooks 8, and bolts 8d are inserted into one of the through holes previously provided on both side surfaces of the lower ends and both side surfaces of the scaffolding hooks 8. Then, the bolt leg protrudes from the other hole, and the bolt leg is screwed and fixed with a nut 8e. These scaffolding hooks 8, 8 are provided side by side.

An opening 8a of each scaffolding hook 8 is provided with a hook cover lever 8b rotatable by a shaft 8g. These hook lid levers 8b are always biased by springs (not shown) so as to block the openings 8a, and each of the hook lid levers 8b closes the openings 8a of the scaffolding hooks 8. It is designed not to open against the load from below.

Both ends of a connecting rod 8f are fixedly provided at positions displaced from the shaft 8g on the opposite inner surfaces of the bent edges of the two hook lid levers 8b. A substantially daruma-shaped plate cam 8h is provided in the intermediate portion, and an opening hole is provided at the tip of the plate cam 8h, and one end of a rope 9 is tied to the opening hole and extends (see FIG. 5). ). When the rope 9 is pulled up against the force of the spring, as shown in FIG. 8a is opened.

As shown in FIG. 1, the wire ladder 10 has a ladder shape, but the width of the ladder becomes slightly narrower toward the tip.

Next, a description will be given of how the scaffolding A of the first embodiment is attached to the cross arm C of the steel tower of the transmission line. The jig 1 and the wire ladder 10 are separately lifted up to the cross arm C on the upper part of the steel tower. After that, inside the cross arm C, the scaffolding hook 8 of the jig 1 is directed to the outside of the cross arm C, and the jig 1 is erected. Subsequently, as shown in FIG. 6, the cross arm main member hook 7 of the jig 1 is hooked on the cross arm main member C1, and each portion where the front surface of each of the struts 2, 2 and the rear surface of the cross arm hanging member C2 abut against each other. Secure each by lashing with double protective ropes (13 in FIG. 6). The cross-arm main material hook 7 is hooked on the cross-arm main material C1 and then lashed with a double protective rope.

As a result, the jig 1 is fixed to the cross arm main member C1 and the cross arm suspension member C2 at a total of three points, one on the cross arm main hook 7 and two on the double protection rope.

After that, as shown in FIG. 5, the ropes 9 of the two scaffolding hooks 8 of the jig 1 are pulled up to open the respective openings 8a, and the most base of the cord ladder 10 is attached to each of the openings 8a. A crosspiece 10a provided near the end is fitted from above and hooked. Further, as shown in FIG. 7, the pulling of the rope 9 of the scaffolding hook 8 is stopped and the opening 8a of each scaffolding hook 8 is closed by the hook lid lever 8b.

Then, the base end upper surface of the outer end of the crosspiece 10a closest to the base end of the cord ladder 10 is overlapped with the lower surface of the lower end of each support 2 in each of the scaffolding hooks 8. As shown in FIG. As a result, even if the wire ladder 10 tries to rotate downward about the crosspiece 10a, the upper surface of the base end of the wire ladder 10 collides with the lower surface of the lower end of each pillar 2 and is stopped, resulting in unnecessary movement of the wire ladder 10. can be prevented. As described above, the jig 1 fixed to the side surface of the cross arm C and the wire ladder 10 are connected to each other to form an L shape. At this time, the position where the wire ladder 10 of the scaffold A protrudes is below the cross arm main member C1, below the transmission line D and the insulator string E.

Subsequently, as shown in FIG. 8, the other end of the sling belt 11, one end of which was previously fixed to the tip of the wire ladder 10, is pulled and tied to the eyebolt 6 of the post 2 of the jig 1 for support. do. A lever block (registered trademark) is interposed in advance between the other end of the sling belt 11 and the eyebolt 6 (not shown), and the tension of the sling belt 11 is adjusted by operating the lever block (registered trademark). Then, the height of the tip of the cord ladder 10 can be adjusted. Another sling belt 11 is extended from the eyebolt 6 on the rear side of the upper part of the post 2 of the jig 1 and supported by the member on the other side of the cross arm C. As shown in FIG.

Subsequently, as shown in FIG. 1, two auxiliary branch lines 12 are stretched from both sides of the tip portion of the cord ladder 10 toward the base end and the tip portion of the cross arm C in a V-shape in plan view, To prevent the rolling ladder 10 from swinging sideways.

As described above, if the scaffolding A of the first embodiment is used, the scaffolding A is formed into an L shape by the jig 1 having two upright pillars 2 and the tightening wire ladder 10. A plane consisting of two struts 2 forming the vertical side of the L-shape is fixed to the side surface of the cross arm C, and the top end of the wire ladder 10 and the top end of the strut 2 forming the horizontal side of the L-shape. is connected and supported by a sling belt 11 with a lever block (registered trademark), so that the wire ladder 10 is not supported on the transmission line D or the insulator string E, and the cross arm is placed above the wire ladder 10 Even if there is no C or the like, it can be securely supported and fixed to the cross arm C or the like.

In addition, the cross arm main material hooks 7 are provided at positions slightly above the lower portions of the posts 2, 2, and the scaffold A is attached to the cross arm C by hooking the cross arm main material C1 with these cross arm main material hooks 7. The position where the tip of the wire ladder 10 projects is below the power transmission line D and the insulator string E, and a worker rides on the wire ladder 10 of the scaffold A to perform maintenance of the power transmission line D, the insulator string E, etc. The position is suitable for inspection work.

The scaffold A can also be attached to both sides of the cross arm C, as shown in FIGS. In this case, the ends of the wire ladders 10, 10 to the eyebolts 6, 6 of the jigs 1, 1 are connected by sling belts 11, 11, and two adjacent belts erected in the cross arm C are connected. A sling belt 11 is connected to the eyebolts 6, 6 of the jigs 1, 1 to connect both the jigs 1, 1. As a result, the two scaffolds A, A can be attached in a well-balanced manner, and the stability of the scaffold A is increased.

In Embodiment 1, one cross arm main material hook 7 is provided on the two posts 2, 2, but the number of hooks may be two, and the required number may be provided. In that case, two hooks 7 for cross arm main material may be provided using the bolt holes on both sides of the mounting plate 7a. Also, the cross arm main material hook 7 may be omitted, and other methods such as simply tying with a rope may be used.

Furthermore, the scaffolding A is attached to the cross arm hanging member C2 of the cross arm C by lashing it with a double protective rope, but it is not limited to the double protective rope, and other ropes or wires may be used. Other than lashing ropes, for example, a hook may be provided in advance on each post 2 of the jig 1, and the hook may be hooked on the cross arm hanging member C2. The jig 1 and the cross arm C may be fixed with other fixing fittings.

Also, although the jig 1 is provided with two scaffolding hooks 8 to attach the cording ladder 10, the method of attaching the cording ladder 10 to the jig 1 is not limited to the scaffolding hooks 8, and other methods may be used. . Furthermore, the opening 8a of the scaffolding hook 8 is provided with a rotatable hook lid lever 8b to prevent the cord ladder 10 from being accidentally removed, but the hook lid lever 8b may be omitted. In addition, other methods may be used to prevent accidental detachment.

Also, the sling belt 11 is used to stretch the branch line from the tip of the cord ladder 10 toward the upper end of the jig 1, but the branch line is not limited to the sling belt 11, and the branch line can be stretched without any inconvenience. Anything else is fine if you can. A lever block (registered trademark) is interposed between the other end of the sling belt 11 and the eyebolt 6, and the tension of the sling belt 11 is adjusted by operating this lever block (registered trademark). However, the method of adjusting the height of the tip of the cord ladder 10 is not limited to this method, and other methods may be used. Moreover, the wire ladder 10 does not have to be ladder-shaped, and may be a scaffold material having crosspieces at the base ends.

In the above-described embodiment, the scaffolding hook 8 is provided at the lower end of each of the columns 2. However, a horizontal rail may be provided between the lower portions of the two columns 2, and the scaffolding hook 8 may be provided on the horizontal rail. Also good. In that case, the upper surface of the proximal end of the outer end of the cord ladder 10 closest to the proximal end is overlapped with the lower surface of the crosspiece.

A scaffolding B steel tower C cross arm D transmission line E insulator string 1 jig 2 post 3 upper long bolt 4 middle long bolt 5 connecting rod 6 eye bolt 7 hook for cross arm main material 8 hook for scaffolding 8a opening 8b lever for hook lid 9 rope 10 wire ladder 11 sling belt 12 auxiliary branch wire
13 Lashing points for double protective ropes

Claims (5)

In the work scaffolding that is erected during maintenance and inspection of the insulator string near the tip of the cross arm of the steel tower and the transmission line,
The scaffold for work consists of a jig detachably fixed to the cross arm, and a scaffolding material whose base end is detachably fixed to the jig and whose tip protrudes below the power transmission line and the insulator string. ,
The jig is formed by fixing two struts spaced apart by a plurality of horizontal beams, and the two struts of the jig are connected to the cross arm main member and the cross arm hanging member on one side of the cross arm. fixed,
A branch line is stretched from the tip of the scaffolding whose base end is fixed to the jig to the upper end of the jig, and a branch line is stretched from the upper end of the jig to a member on the other side of the cross arm. A scaffold for working on a steel tower, characterized in that: 2. The work scaffolding for a steel tower according to claim 1, wherein hooks for a cross arm main material to be hooked on the cross arm main material of the cross arm are provided on the two pillars of the jig. For fixing the scaffolding material to the jig, two scaffolding hooks with openings facing upward are provided at intervals at the lower end of each of the supports of the jig or on the horizontal beam that spans the lower part of the support. A crosspiece provided near the base end of the scaffolding material is hooked on the scaffolding hook from above, and the top surface of the base end outside the crosspiece of the scaffolding material overlaps the lower end of each of the columns or the lower surface of the horizontal crosspiece. The work scaffolding for a steel tower according to claim 1 or 2, characterized in that it consists of: Each scaffolding hook opening is provided with a hook lid lever that always closes each opening, and each hook lid lever opens against a load from below the opening of the scaffolding hook. First, when the upper end of each hook lid lever is pulled up against the force of the spring, the opening of the scaffolding hook is opened. scaffolding. The work scaffold for a steel tower according to any one of claims 1 to 4, characterized in that an auxiliary branch line is stretched from the tip of the scaffold member toward the cross arm in a V-shape in a plan view.

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