JPH0732879Y2 - Fixed ladder - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a fixed ladder which is used by being fixed to a predetermined place such as a substation or a cave.

(Prior Art) FIG. 9 shows an aerial terminal mount installed in a substation. That is, the aerial terminating base has a structure in which the terminating installation base 2 is horizontally mounted on the upper ends of a pair of columns 1, 1, and the aerial terminating portion 3 is fixed on the terminating installation base 2. Each air terminal 3 is installed via a branch cable 5 on a high voltage power cable 4 of 22 KV or more.

When performing maintenance, inspection, repair, etc. of the aerial terminal end portion 3 in the aerial terminal mount having the above configuration, the upper portion of the conventionally portable ordinary ladder 6 is hung on the end portion of the terminal installation base 2 to perform the work. The person climbed this ladder 6 and was on the terminal installation base 2.

(Problems to be solved by the invention) However, in the substation, since an overhead wire is often laid above the aerial terminal pedestal, the ladder 6 may contact the overhead wire when the ladder 6 is hung. Was very dangerous.

It is conceivable to fix the ladder 6 to the column 1 or the like in advance, but in this case, since the upper part of the ladder 6 projects above the terminal installation base 2, the upper end of the ladder 6 and the air located in the vicinity thereof The distance A from the terminal portion 3 becomes small, and there is a risk that discharge will occur between them.

It is conceivable to fix the ladder 6 to the pillar 1 etc. so that the upper end does not project beyond the terminal installation base 2, but in this case, when the operator is mounted on or dismounted from the terminal installation base 2, the upper part of the vertical girder of the ladder 6 Since it is not possible to hold the robot, a fall accident may occur.

FIG. 10 is a cross-sectional view of a cave, in which 7 indicates a metal plate. Receiving objects 8 are supported on the uprights 7 at a predetermined interval, and cables 9 are laid on the respective receiving objects 8.

By the way, a branching cave 10 (or an emergency exit) for branching the cable 9 is normally communicated with such a cave upside. In order to ascend and descend to the branch cave 10, conventionally, a U-shaped scaffolding metal fitting 11 fixed to the side wall of the cave is used. However, when a worker moves up and down using the scaffolding metal fitting 11, there is no scaffolding metal fitting that can be held by hand when the foot is put on the topmost scaffolding metal fitting 11, and thus a fall accident may occur. is there.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a fixed ladder that can be safely moved up and down and can be set with a large distance from the high-voltage section. .

(Means for Solving the Problems) In the present invention, a plurality of transverse girders are provided between a pair of longitudinal girders, and one longitudinal girder is movably attached along the length direction of the longitudinal girder. In the fixed ladder including an auxiliary vertical girder whose tip side is operated so as to project and retract from one end, and a support portion which is provided on the one vertical girder and supports the auxiliary vertical girder in a protruding state, A receiving portion provided on the other end side of the girder, and an abutting portion provided on the base end of the auxiliary vertical girder and operably protruding and abutting on the receiving portion at its retracted position, To do.

(Operation) The vertical girder is fixed to a predetermined position by the fixing portion, and the fixed ladder of the present invention is fixed in advance.

At the time of use, an operator on the floor surface lifts the contact part from the receiving part, projects the auxiliary stringer from the stringer, and supports the contact part by the support part.

Therefore, since it is a fixed type, there is no danger of contacting dangerous materials around it such as overhead lines, and the auxiliary stringer is retracted when not in use, so it can be used for high voltage parts such as the air terminal part. Can hold large intervals.

Further, since the auxiliary vertical girder is projected during use, it is possible to safely move up and down by gripping the auxiliary vertical girder.
Then, when the work is completed, the worker can get off the ladder, remove the contact portion from the support portion on the floor surface, and bring the contact portion into contact with the receiving portion, so that the operation of projecting and retracting the auxiliary stringer can be performed safely. It is possible.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

1 and 3 are perspective views showing the essential parts of the fixed ladder 20 according to the present invention, and FIG. 4 is a front view of the same ladder 20.

First, referring to FIG. 4, the fixed ladder 20 of the present invention comprises a pair of vertical girders 21 and 22 arranged in parallel.
A plurality of horizontal girders 23 are provided at equal intervals. The above is the same configuration as the conventional ladder.

As shown in FIGS. 1 and 4, an auxiliary column girder 24 is arranged along the length direction on the side of one column girder 21. The auxiliary vertical girder 24 is composed of a long columnar rod body, and has an abutting portion 24a formed by being bent in an L shape at the lower portion.
The contact portion 24a is accommodated in a receiving portion 25 having an L-shaped cross section, which is provided below the vertical girder 21, with its tip protruding so that it can be lifted. The upper part of the auxiliary girder 24 is inserted above the girders 21 by the support plates 26, 26 protruding in the thickness direction. Therefore, the auxiliary vertical girder 24 is abutted at the receiving portion 25.
Since 24a is supported, the support plates 26, 26 are prevented from slipping out, and are supported by the support plates 26, 26 so as to be able to project along the longitudinal direction (upward) of the longitudinal girder 21. The upper end 24b of the auxiliary vertical girder 24 is slightly projected from the upper end of the vertical girder 21 when the contact portion 24a is accommodated in the receiving portion 25 and is not used.

A supporting portion 27 is provided substantially at the center of the vertical girder 21. As shown in FIGS. 1 and 2, the support portion 27 has a U-shaped cutout 2 for vertically inserting the contact portion 24a into the bottom wall.
8 are provided. Further, a U-shaped receiving recess 29 for abutting and supporting the abutting portion 24a is provided on the rising wall of the supporting portion 27.

The other vertical girder 22 is provided with fixing portions 30 and 30, as shown in FIGS. 3 and 4. As shown in FIG. 3, these fixing portions 30 include a support plate 31 extending in a direction orthogonal to the cross beam 23 and a substantially circular fitting portion integrally formed at the tip of the support plate 31. 32, a tightening plate 33 extending from both ends of the fitting portion 32 so as to face each other, a tightening bolt 34 inserted into the tightening plates 33, 33, and screwed to the tightening bolt 34. Consisting of a nut 35. The fitting portion 32 is configured such that a substantially half portion thereof is opened outward by the hinge 36.

Next, a usage mode of the fixed ladder 20 of the present invention will be described.

That is, as shown in FIG. 3, the fitting portions 32 of the fixing portions 30 and 30 are
Open through the hinge 36 and, as shown in FIG.
, And tighten the tightening bolts 34 to bring the tightening plates 33, 33 closer to each other and reduce the diameter of the fitting part 32.
Thereby, the fixed ladder 20 of the present invention is fixed to the column 1.

When the fixed ladder 20 fixed in this way is not used, the tip 24b of the auxiliary vertical girder 24 projects slightly above the vertical girder 21, and therefore is positioned below the terminal installation base 2. Therefore, it is possible to set and hold a large distance between the aerial end portion 3 and the auxiliary vertical girder 24, so that no discharge occurs between them.

When the fixed ladder 20 is used, as shown in FIG. 5, an operator on a floor surface (not shown) receives the contact portion 24a of the auxiliary vertical girder at the receiving portion 2a.
Lifted from 5, and inserted into the notch 28 of the support portion 27 from below. Then, in the state where the contact portion 24a is located above the support portion 27 (see the alternate long and short dash line), the contact portion 24a is rotated 90 degrees, and the contact portion 24a is directly engaged and brought into contact therewith. The contact portion 24a is supported by the support portion 27. Therefore,
The auxiliary girder 24 corresponds to the distance between the receiving portion 25 and the supporting portion 27 (for example, 50
cm) project above the stringer 21 only. Therefore, as shown in FIG. 6, since the auxiliary vertical girder 24 projects above the terminal installation base 2, the auxiliary vertical girder 24 is used when the operator is placed on the terminal installation base 2 or gets off the base 2. You can hold it. Then, when the work is completed, the worker can dismount the abutment portion 24a from the support portion 27 on the floor surface after coming off the ladder and bring the abutment portion 25 into contact with the auxiliary vertical girder 24 to retract it. . As a result, it is possible to reliably prevent the worker from falling from the fixed ladder 20.

FIG. 7 shows an example in which the fixed ladder 20 of the present invention is applied to a cave. This fixed ladder 20 is used for raising and lowering an operator in place of a scaffolding metal fitting (see FIG. 10), and is fixed to a side wall of a cave. That is, this fixed ladder 20 is
This fixed portion 30 'has a flange 37 at the tip of the support plate 31 embedded in the side wall of the cave, which allows the fixed ladder 20' to be fixed.
Is fixed in the cave. The other structure of the fixed ladder 20 is the same as that of the above-mentioned embodiment.

Now, when going up and down between the cave and the branch cave 10, the auxiliary girders 24 are projected and supported in exactly the same way as described above, and are positioned above the bottom wall of the branch cave 10. Let Therefore, the worker can always grasp the auxiliary longitudinal girder 24 when going up and down between the cave and the branch cave 10, so that a fall accident can be prevented.

In the above two embodiments, the fixing portion 30 or 30 'may be attached to the vertical girder 21 on the side of the auxiliary vertical girder 24.
30 or 30 'may be attached to both stringers 21,22.

Further, the fixing portions 30 and 30 'are changed into various structures corresponding to the fixing portions.

That is, FIG. 8 is a perspective view of a fixing portion according to another embodiment, and this fixing portion 30 extends in parallel with the fitting halves 32a and 32b having a substantially semicircular shape and one fitting half 32a. Pillar plates 31a and 31a fixed to the opposing surfaces of the vertical girders 21 and 22, respectively, and tightening plates 33a and 3 extending oppositely from both ends of both fitting halves 32a and 32b.
3b and the tightening bolts 34 that penetrate the tightening plates 33a and 33b.
And a nut 35 screwed to the bolt 34.

In the fixing portion 30 of this embodiment, the fitting halves 32a and 32b are fitted to the column 1 shown in FIG. 6, and the tightening bolt 34 and nut 35 are attached.
The fixed ladder of the present invention can be fixed to the column 1 by tightening and fixing the tightening plates 33a and 33b with.

(Effect of the Invention) As described above, according to the present invention, the auxiliary girder is fixed at a predetermined position by the fixing part, and the auxiliary girder is projected from the girder to be supported by the supporting part during use. There is no risk of contact with surrounding dangerous materials, and since the auxiliary stringer is retracted when not in use, a large gap can be maintained with respect to the high voltage part, and the auxiliary stringer can be held when used. It is possible to provide a fixed ladder that can be safely lifted and lowered.

Further, since the projecting and retracting operations of the auxiliary stringer can be performed on the floor surface, it is possible to further secure the safety of the worker.

[Brief description of drawings]

1 and 2 are perspective views of a main portion of a fixed ladder according to the present invention and a cross-sectional view showing a support portion of the ladder, FIG. 3 is a perspective view of a fixed portion of the ladder, and FIG. 4 is the same. Front view showing the entire ladder,
FIG. 5 is a side view showing a usage mode of the ladder, FIG. 6 is a configuration diagram showing an example in which the ladder is applied to an aerial terminal mount, and FIG. 7 is a cross section showing an example in which the ladder is applied to a cave. 8 and 9 are perspective views of a fixing portion according to another embodiment of the present invention, and FIGS. 9 and 10.
The drawings are a configuration diagram and a cross-sectional view, respectively, showing a conventional raising / lowering method for an air-terminating base and a cave. 1 ... Support pillar, 3 ... Air terminal part, 20 ... Fixed ladder, 2
1,22 …… Vertical girder, 23 …… Horizontal girder, 24 …… Auxiliary girder, 24a ……
Abutment part, 27 ... Support part, 30, 30 '... Fixed part.

Claims (1)

[Scope of utility model registration request] 1. A plurality of transverse girders are provided between a pair of longitudinal girders,
An auxiliary girder that is movably attached to one of the girders so that its tip end side can project and retract from one end of the girder, and the auxiliary girder provided on the one girder. In a fixed ladder provided with a supporting portion for supporting the stringer in a protruding state, a receiving portion provided on the other end side of the one stringer and a base end of the auxiliary stringer at the retracted position thereof. A fixed ladder comprising: a contact portion that operably projects and contacts the receiving portion.