JP6605168B1 - Pipe work scaffold - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scaffold for in-pipe work that is less likely to be laterally shifted even when an operator moves and contributes to improvement of work safety. The in-pipe work scaffold according to the present invention is used for work inside a pipe member installed with a gradient, and includes a ladder part and an inner surface band connected to the ladder part. The inner band is an annular member urged outward in the circumferential direction, and the ladder connected to the inner band is fixed at a fixed position inside the pipe member by bringing the inner band into contact with the inner surface of the pipe member. It is supposed to be. [Selection] Figure 1

Description

  The present invention relates to an in-pipe work scaffold used for work in a pipe.

  Due to the nature, hydraulic iron pipes for hydroelectric power generation and underground pipes for rivers are installed with a certain degree of gradient. For example, a hydraulic iron pipe for hydropower generation needs to rotate a water turbine for power generation using water passing therethrough, and is installed with a gradient of about 25 to 35 degrees. In such a pipe, operations such as joining of pipe members and painting of the inner surface of the pipe are performed. In the work, a scaffold is built inside the pipe member, and the worker moves on the scaffold to perform the work.

  2. Description of the Related Art Conventionally, as a scaffold used for work in a pipe, one having a support rope fixed to an upper portion of a pipe member and a ladder device suspended from the support rope has been proposed (Patent Document 1).

JP 2007-23494 A

  Since the ladder device described in Patent Document 1 is a ladder device suspended from a support rope, there is a problem in that the operator is likely to slip laterally when moving the ladder device.

  SUMMARY OF THE INVENTION An object of the present invention is to provide an in-pipe work scaffold that is less likely to slip laterally even if an operator moves, and that contributes to improved work safety.

The in-pipe work scaffold according to the present invention is used by being installed inside the pipe member when working inside the pipe member installed with a gradient, and is connected to the ladder part and the ladder part. It has an inner band. The ladder portion has a length that can be accommodated in one pipe member. Inner surface band Ru annular member der biased toward the circumferential direction outside. The ladder portion is disposed inside the inner band so as to intersect the inner band. When the curved surface of the inner surface band facing the inner surface of the pipe member comes into contact with the inner surface of the tube member without a gap , the inner surface band is fixed to the contact position of the tube member, and the ladder portion connected to the inner surface band is The inside of the member is fixed at a position along the inner surface of the pipe member on the installation surface side .

  In the pipe work scaffold according to the present invention, the inner surface band biased toward the outer side in the circumferential direction is brought into contact with the inner surface of the pipe member, so that the ladder portion connected to the inner band is placed at a fixed position inside the pipe member. Since it is made to be fixed, even if an operator moves on a ladder part, a ladder part does not slip sideways easily. As a result, it is possible to ensure higher safety than the conventional scaffold.

The perspective view which shows an example of the scaffold for pipe work of this invention. The use condition explanatory drawing of the scaffold for pipe work of this invention. (A) is the III-III end view of FIG. 2, (b) is the A section enlarged view of (a). (A) is the IV-IV end view of FIG. 2, (b) is the B section enlarged view of (a). (A) is the VV end view of FIG. 2, (b) is the C section enlarged view of (a). (A) is the VI-VI end view of FIG. 2, (b) is the D section enlarged view of (a).

(Embodiment)
An example of the in-pipe work scaffold according to the present invention will be described with reference to the drawings. As an example, the in-pipe work scaffold shown in FIG. 1 includes a ladder part 10, an inner surface band 20 connected to the ladder part 10, and a scaffold part 30 connected to the ladder part 10. Although omitted in FIG. 1, an inner surface band 20 similar to the inner surface band 20 on the upper end side is provided on the lower end side of the ladder portion 10 (see FIG. 2).

  As an example, the ladder portion 10 shown in FIG. 1 includes two longitudinal frames 11 that are elongated in the longitudinal direction of the pipe member P, and a plurality of legrests 12 that are installed between the two longitudinal frames 11. The two vertical frames 11 are arranged in parallel in the width direction of the pipe member P, and the plurality of leg rods 12 are arranged in parallel in the length direction of the two vertical frames 11. Yes.

  The footrest 12 of this embodiment has washers 13 welded to both ends in the longitudinal direction (see FIGS. 3A and 3B). A nut 14 is welded to each washer 13. The opening of the washer 13 and the nut 14 communicates with the opening of the footrest bar 12.

  Each footrest 12 is disposed between the vertical frames 11 and is coupled to the vertical frame 11 by screwing bolts 15 inserted from the outside of the vertical frames 11 into the nuts 14.

  In this embodiment, a flat bar is used as the vertical frame 11, but other than the flat bar can be used for the vertical frame 11. Moreover, although the square pipe is used for the leg rod 12, things other than square pipes, such as a round pipe, can also be used.

  The length of the ladder portion 10 can be appropriately designed according to the length of the pipe member P. In any case, it is preferable that the length be within the single pipe member P. By making it shorter than the length of one pipe member P, it is difficult to cause troubles in operations such as welding and painting. In the case where the length of the ladder portion 10 is long enough to bend depending on the weight of the operator or the like, it is preferable to provide the reinforcing jig 40 at an intermediate portion of the ladder portion 10.

  As an example, the reinforcing jig 40 shown in FIG. 1 includes a contact plate 41, a rubber plate 42 provided on the outer surface of the contact plate 41, and a connecting flange 43 erected on the inner surface side of the contact plate 41. ing. The abutting plate 41 and the rubber plate 42 are members addressed to the inner surface of the pipe member P, and are rolled so as to easily abut against the pipe member P. Reinforcing ribs 44 are provided between the contact plate 41 and the connection flange 43 so as to intersect the contact plate 41 and the connection flange 43.

  As shown in FIGS. 3A and 3B, the reinforcing jig 40 is connected to the ladder portion 10 by using bolts 15 and nuts 14 used for connecting the vertical frame 11 and the foot rod 12. Specifically, the connecting flange 43 of the reinforcing jig 40 is directed to the outside of the vertical frame 11, and the bolt 15 inserted from the outside of the connecting flange 43 is screwed into the nut 14 positioned inside the vertical frame 11. It is connected to the ladder part 10 by.

  In this embodiment, a case where two reinforcing jigs 40 are provided at intervals in the longitudinal direction of each vertical frame 11 of the ladder portion 10 is taken as an example, but one reinforcing jig 40 is provided for each vertical frame 11. One or three or more can be provided. It should be noted that the same number of reinforcing jigs 40 are provided at the same position on the left and right vertical frames 11 so that the deflection and rattling of the ladder portion 10 can be effectively suppressed.

  As shown in FIG. 2, an inner band 20 is provided at positions near the upper end and the lower end of the ladder portion 10. The inner surface band 20 of this embodiment is formed by connecting three belt-like members 21 into an annular shape. In this embodiment, a rolled flat bar is used as the band-shaped member 21. As shown in FIGS. 4A and 4B, a buffer plate 22 is provided on the outer periphery of the inner surface band 20. An existing rubber plate or the like can be used for the buffer plate 22.

  At both ends of each band-shaped member 21, a connection plate 23 used for connection with the other band-shaped member 21 is projected inward. Each connecting plate 23 is provided with a reinforcing rib 24 in a direction intersecting with the connecting plate 23.

  The adjacent first and second belt-like members 21 are end-to-end with no gaps, and the opposing connecting plates 23 are connected by bolts 25 and nuts 26. Similarly, the end faces of the second and third belt-like members 21 are attached to each other without a gap, and the opposing connecting plates 23 are connected by bolts 25 and nuts 26.

  On the other hand, the third and first belt-like members 21 are arranged with a gap S between their end faces, and both connecting plates 23 are connected by bolts (tension bolts) 25 and nuts 26. In this embodiment, the gap S between the third and first strip members 21 is about 5 cm, but the gap S may be wider or narrower.

  The inner band 20 can be increased or decreased in diameter by adjusting the tightening force of the bolt 25 and the nut 26. Specifically, the diameter can be increased by loosening the tightening of the bolt 25 and the nut 26, and the diameter can be decreased by tightening the tightening.

  In this embodiment, two engagement plates 27 project from the first belt-like member 21 at intervals. The connection plate 27 is a member used for connection with the ladder portion 10. The connection plate 27 of this embodiment is a rectangular flat plate provided with bolt insertion holes, and is welded to the inner surface of the inner surface band 20.

  As shown in FIGS. 4A and 4B, the inner surface band 20 has the connecting plate 27 superimposed on the outside of the vertical frame 11 of the ladder portion 10, and the bolts 15 inserted from the outside are placed inside the vertical frame 11. It is connected to the ladder portion 10 by being screwed to the nut 14 positioned.

  As shown in FIGS. 1 and 2, a scaffold portion 30 is provided at a position near the upper end of the ladder portion 10. In this embodiment, one scaffold part 30 is provided for each of the vertical frames 11 of the ladder part 10.

  As an example, the scaffold 30 shown in FIG. 1 includes a front leg member 31, a rear leg member 32, and a work scaffold 33. The front leg member 31 and the rear leg member 32 are support legs that support the work scaffold 33. In this embodiment, square pipes are used as the front leg member 31, the rear leg member 32 and the work scaffold 33. A thing other than a square pipe can also be used for the front leg material 31, the rear leg material 32, and the work scaffold 33.

  The working scaffold 33 of this embodiment includes three vertical members 33a arranged at intervals, and two erected members 33b laid so as to straddle the three vertical members 33a. The vertical members 33a can be more or less than three. Further, the construction material 33b can be more or less than two.

  In the work scaffold 33, the front leg member 31 is welded to the back side of the front erection material 33b. In the work scaffold 33, a leg connecting flange 34 projects downward on the back side of the rear construction material 33b. The upper end side of the rear leg member 32 is addressed to the leg connecting flange 34, and the rear leg member 32 and the work scaffold 33 are connected by fastening the nut 26 to the bolt 25 inserted through these members.

  As shown in FIGS. 5 (a) and 5 (b), the work scaffold 33 is configured such that the lower end side of the front leg 31 is overlapped with the outside of the vertical frame 11 and the bolt 15 inserted from the outside is positioned inside the vertical frame 11. 6 (a) and 6 (b), the lower end side of the rear leg member 32 is overlapped with the outer side of the vertical frame 11, and the bolt 15 inserted from the outer side is connected to the vertical frame. 11 is coupled to the ladder portion 10 by being screwed into a nut 14 positioned inside the inside.

  In this embodiment, the work footing 33 is made horizontal by making the front leg material 31 shorter than the rear leg material 32. By making the work scaffold 33 horizontal, the worker can easily maintain the posture, and as a result, the worker can safely perform various operations.

  In the in-pipe work scaffold according to this embodiment, the inner band 20, the scaffold portion 30, and the reinforcing jig 40 are connected to the ladder portion 10 with bolts 15 and nuts 14, so that each member can be separated from the ladder portion 10. it can.

  The manhole formed when installing the pipe member P is as narrow as about 500 mm in diameter, but by allowing each member to be separated from the ladder portion 10 as in this embodiment (the work scaffold in the pipe can be disassembled), Carrying into and out of the manhole can be carried out smoothly. In addition, problems such as peeling of coating due to the contact of each member with the inner surface of the pipe member P are unlikely to occur.

  Further, in this embodiment, since the inner band 20 is constituted by a plurality of (three in this embodiment) band-like members 21 that can be divided, the inner band 20 can be smoothly carried in and out. .

  Furthermore, in this embodiment, since a flat bar that can be bent to some extent is used as the vertical frame 11, it is carried into the manhole as compared to the case where a rigid material that cannot be bent is used as the vertical frame 11. And can be carried out smoothly from the manhole.

(Other embodiments)
In the embodiment, the case where two inner surface bands 20 are provided is taken as an example, but the inner surface band 20 may be one or three or more.

  In the said embodiment, although the case where the scaffold part 30 is provided is taken as an example, since the ladder part 10 functions also as a scaffold, the scaffold part 30 can also be abbreviate | omitted.

  In the embodiment, the case where the reinforcing jig 40 is provided is taken as an example. However, the reinforcing jig 40 may be provided as necessary, and may be omitted when unnecessary.

The embodiment is an example, a ladder portion 10, the inner surface band 20, the scaffold section 30, the configuration of the reinforcing fixture 40 may be other configurations in a range capable of attaining the intended purpose.

(Example of use)
An example of using the in-pipe work scaffold of the present invention will be described.
(1) In the state where the inner surface band 20 is smaller than the inner diameter of the pipe member P, the in-pipe work scaffold is carried into the pipe member P.
(2) The bolt 25 is loosened at a desired position, the diameter of the inner surface band 20 is increased and brought into contact with the inner surface of the pipe member P.
(3) When the inner surface band 20 is brought into contact with the inner surface of the pipe member P, the in-pipe work scaffold is positioned at a predetermined position of the pipe member P by the urging force of the inner surface band 20 outward in the circumferential direction.
(4) An operator puts his / her feet on the ladder unit 10 and the scaffold unit 30 and performs various operations such as painting and welding.
(5) After the operation is completed, the bolt 25 is tightened to reduce the diameter of the inner surface band 20 and away from the inner surface of the pipe member P.
(6) After separating the inner band 20 from the inner surface of the pipe member P, the in-pipe work scaffold is removed or moved into the next pipe member P.

  The in-pipe work scaffold of the present invention can be installed inside various pipe members P and used as a scaffold. In particular, it can be effectively used when working inside a pipe member P (inclined pipe member P) installed with a gradient, such as a hydraulic iron pipe for hydroelectric power generation or a river subsidence pipe.

DESCRIPTION OF SYMBOLS 10 Ladder part 11 Vertical frame 12 Suspension stick 13 Washer 14 Nut 15 Bolt 20 Inner surface band 21 Band-shaped member 22 Buffer plate 23 Connection plate 24 Reinforcement rib 25 Bolt 26 Nut 27 Joint plate 30 Scaffolding part 31 Front leg member 32 Rear leg member 33 Working scaffold 33a Vertical member 33b Installation member 34 Leg connecting flange 40 Reinforcing jig 41 Contact plate 42 Rubber plate 43 Connecting flange 44 Reinforcing rib P Pipe member S Gap

Claims (6)

In Working inside the tube member to be installed with a gradient, a pipe work platform to be used installed inside of the tube member,
A ladder part and an inner band connected to the ladder part;
The ladder part has a length that can be accommodated in one pipe member,
The inner band is an annular member biased toward the outer side in the circumferential direction,
The ladder portion is disposed inside the inner band in a direction intersecting with the inner band,
When the curved surface facing the inner surface of the tube member of the inner surface band comes into contact with the inner surface of the tube member without a gap , the inner surface band is fixed at the contact position of the tube member and the ladder connected to the inner surface band The part is fixed inside the pipe member and at a position along the inner surface on the installation surface side of the pipe member .
A scaffold for in-pipe work. In the pipe work scaffold according to claim 1,
Two or more inner bands were provided at intervals in the longitudinal direction of the ladder.
A scaffold for in-pipe work. In the pipe work scaffold according to claim 1 or 2,
The ladder part is provided with a reinforcing jig for preventing the deflection of the ladder part.
A scaffold for in-pipe work. In the pipe work scaffold according to any one of claims 1 to 3,
The ladder part is provided with a scaffolding part on which workers can put their feet,
The scaffold portion includes a support leg and a work scaffold supported by the support leg,
The working scaffold is horizontally supported by the support legs;
A scaffold for in-pipe work. In the in-pipe work scaffold according to any one of claims 1 to 4,
The inner band, the reinforcing jig and the scaffold part can be separated from the ladder part,
A scaffold for in-pipe work. In the pipe work scaffold according to any one of claims 1 to 5,
The inner surface band is composed of a plurality of connected band-shaped members,
Each of the band-shaped members has a size that can pass through a manhole formed when the tube member is installed.
A scaffold for in-pipe work.

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