JP2023181577A - Scaffold structure - Google Patents

Abstract

To provide a scaffold structure allowing safety upon repair work in a manhole to be improved and installation of a small bore manhole and the like to be easily carried out.SOLUTION: A scaffold structure is provided with: a foldable receiving frame 1 placed on an upper surface of a flange part 44 projecting in a horizontal direction from a wall surface forming a cylindrical space in a circular shape in a plan view toward a central axis extending in a vertical direction so as to abut thereon at three points or more; and scaffold boards placed on the receiving frame. The receiving frame may be formed in a square frame shape, a scaffold board 21 may be formed in a circular grating type in a top view, and scaffold boards 51, 52 in foldable plate-like shapes may be used.SELECTED DRAWING: Figure 4

Description

The present invention relates to a scaffolding structure used for reconstruction work of manholes used in sewage facilities and the like.

Existing concrete manholes installed in the sewage pipeline network have corroded areas on their inner surfaces due to corrosion caused by hydrogen sulfide, etc. and deterioration over time, and if left unrepaired, earth pressure from the surrounding area will This can cause cracks in the corroded parts, which can lead to water leakage or collapse accidents.

Therefore, in order to carry out the above-mentioned repair work without excavation, the present applicant constructed a jig by attaching an outer panel mainly made of an elastic synthetic resin material to the outer surface of the inner frame. By combining a plurality of cylindrical parts into a cylindrical shape, we have provided a jig assembly for reconstructing sewerage facilities that has excellent mechanical strength, is lightweight, and keeps manufacturing costs low (see Patent Document 1).

When performing reconstruction work on sewage facilities using the jig assembly described in Patent Document 1, when working at heights of 1.8 m or more, measures must be taken to prevent falls or scaffolding must be installed. need to be done. As simple scaffolds for manholes, there are those that are fixed to steps and those that are suspended, as described in Patent Document 2 and the like.

Japanese Patent Application Publication No. 2010-133175 JP2009-270317A

However, since the above-mentioned conventional simple scaffolding has a small scaffolding area and lacks stability, there is a concern that safety may be reduced when performing repair work etc. inside a manhole. Another problem is that it is not easy to bring or construct scaffolding in manholes with small diameters.

Therefore, the present invention has been made in view of the above-mentioned problems, and the present invention improves safety when performing repair work etc. inside a manhole, and also enables scaffolding to be easily installed even in a manhole with a small diameter. The purpose is to provide structure.

In order to achieve the above object, the present invention provides a scaffolding structure in which the upper surface of a flange portion that protrudes horizontally toward a central axis extending vertically from a wall surface forming a circular cylindrical space in plan view. It is characterized by comprising a foldable receiving frame that is placed so as to be in contact with each other at three or more places, and a scaffold board that is placed on the receiving frame.

According to the present invention, the scaffold can be formed so as to close the entire horizontal plane inside the columnar space, so it is possible to improve safety when performing repair work etc. within the columnar space. In addition, since the receiving frame is configured to be foldable, it can be easily installed in small-diameter manholes, etc., and is easy to handle and convenient to store.

In the scaffolding structure described above, the receiving frame can be formed into a square frame shape. Further, the scaffold board may be a grating scaffold board that is circular in top view and can be folded into a semicircle, or a foldable flat scaffold board may be used.

Further, the wall surface forming the circular cylindrical space in a plan view may be a wall surface of a jig assembly installed in an existing concrete manhole installed in a sewage pipe network, and the present invention Repair work, etc. can be efficiently carried out within an existing manhole using the scaffolding structure related to this.

As described above, according to the present invention, it is possible to provide a scaffolding structure that increases safety when performing repair work etc. inside a manhole and can be easily installed even in a manhole with a small diameter.

FIG. 2 is a schematic diagram showing a receiving frame constituting the scaffolding structure according to the present invention, in which (a) is a plan view showing a folded state, (b) a front view showing a one step expanded state, and (c) a plan view showing a state in which it is unfolded. (d) is a plan view showing the fully opened state. 1 is a schematic diagram showing a grating scaffold constituting a scaffold structure according to the present invention, in which (a) is a plan view showing a state folded in half, (b) is a sectional view taken along the line DD in (a), and (c ) A plan view showing the fully opened state; (d) is a cross-sectional view taken along line E--E of (c). FIG. 1B is a cross-sectional front view for explaining how to install the receiving frame shown in FIG. 1 in a manhole, and FIG. 2B is a partially cutaway perspective view. 2 is a diagram showing a state in which the grating scaffold shown in FIG. 2 is placed on the receiving frame shown in FIG. 1, in which (a) is a top view and (b) is a cross-sectional front view showing a state in which it is installed in a manhole. 2 is a diagram showing a second embodiment of the scaffolding structure according to the present invention, in which (a) is a top view showing a state in which a scaffold board is placed on the receiving frame of FIG. 1, and (b) is a state in which it is installed in a manhole. FIG.

Next, embodiments for carrying out the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a receiving frame 1 constituting a scaffolding structure according to the present invention, and in the folded state shown in FIG. The other frame member 3 is rotatably connected to a shaft 5 fixed to the first connecting portion 4 . Also, below (on the back side) of the two frame members 2 and 3, one of the two frame members 12 and 13 is fixed to the second connection part 14, and the other frame member 13 is fixed to the second connection part 14. It is rotatably connected to a shaft 15 fixed to the connecting part 14.

Connecting members 6, 7, 16, 17 are fixed to one end of the frame members 2, 3, 12, 13 on the side not connected to the first connecting part 4 or the second connecting part 14, respectively, and will be described in detail below. As such, the connecting members 6 and 16 are rotatable with respect to each other by a hinge, and the connecting members 7 and 17 are also configured to be rotatable with respect to each other by a hinge.

1(b) and (c) show a state in which the frame members 2 and 12 are rotated (expanded) in the direction of arrow A and the frame members 3 and 13 are rotated in the direction of arrow B from the state of FIG. 1(a). . The frame members 3 and 13 are rotatable relative to the first connecting part 4 and the second connecting part 14 via shafts 5 and 15, respectively, but are rotated from the state shown in FIG. 1(c) by a stopper (not shown). There is no further expansion, and the frame members 3 and 13 are opened at 90° relative to the frame members 2 and 12.

Next, from the state of FIGS. 1(b) and 1(c), with the frame members 12 and 13 fixed, move the frame members 2 and 3 in the direction of arrow C, that is, from the state of FIG. , 3 in a direction upward away from the plane of the paper, and then rotated 180° so as to drop it toward the plane of the paper, resulting in the fully open state shown in FIG. 1(d).

In the state shown in FIG. 1(d), the connecting members 6, 16 and 7, 17 are connected by hinges 8, 9, respectively, and the back surfaces of the connecting members 6, 7, 16, 17 are located in the same plane. The back surfaces of these and the back surfaces of the first connecting portion 4 and the second connecting portion 14 are also maintained in the same plane, forming a square frame-shaped receiving frame 1 when viewed from above.

Next, the grating scaffold 21 constituting the scaffold structure according to the present invention will be explained with reference to FIG. 2.

As shown in FIGS. 2(a) and 2(b), the grating scaffold 21 is fixed to semicircular grating scaffold boards 22 and 23 and to the surface of the scaffold board 22 with two bolts 27 and two bolts 28. The two supporting plates 24, 25 and the surface of the scaffold board 23 are fixed with two bolts (not shown in FIGS. 2(a) and (b), corresponding to the bolts 29 in FIG. 2(c)). The two grating scaffold boards 22 and 23 are configured to be rotatable with respect to each other by a hinge 30. Note that the bolts are not shown in FIGS. 2(b) and 2(d).

When the scaffolding board 22 is fixed in the state shown in FIGS. 2(a) and (b) and the scaffolding board 23 is rotated 180 degrees in the direction of arrow F, it becomes as shown in FIGS. 2(c) and (d). , since the surfaces of the scaffolding board 22 and the scaffolding board 23 are located on the same plane, and the supporting plates 24 to 26 are interposed between the scaffolding board 22 and the scaffolding board 23, the scaffolding board 22 and the scaffolding board 23 are further rotated. I can't. Therefore, as will be described later, by placing the grating scaffold 21 in the states shown in FIGS. 2(c) and 2(d) on the receiving frame 1, it can be used as a scaffold.

Next, an example of installing the receiving frame 1 and the grating scaffold 21 in a manhole will be explained.

The manhole 41 illustrated in FIG. 3 is a prefabricated manhole made of a plurality of concrete blocks, and a jig assembly 43 is installed inside. The jig assembly 43 is used for reconstruction work of the manhole 41, etc., and is made of resin, metal, etc. and has a cylindrical shape as a whole, with a flange 44 extending horizontally from the inner wall toward the vertical central axis. protrudes in the direction.

First, insert the folded receiving frame 1 (the state shown in FIG. 1(a)) into the opening 42 of the manhole 41, spread it out inside the manhole 41 as shown in FIG. Place it on the top surface.

Next, as shown in FIG. 4, the grating scaffold 21 is placed on the receiving frame 1 located on the upper surface of the flange portion 44, and the scaffold is completed within the manhole 41. By maintaining the illustrated state of the grating scaffold 21, it can withstand the load applied to the top surface.

According to the above-mentioned scaffolding structure, the scaffolding can be formed so as to close the entire horizontal surface inside the jig assembly 43, so it is possible to improve safety when performing repair work or the like. Further, since the receiving frame 1 and the grating scaffold 21 are configured to be foldable, they can be easily installed in a small-diameter manhole 41, etc., and are easy to handle and convenient to store.

Next, another embodiment of the scaffolding structure according to the present invention will be described with reference to FIG.

In this embodiment, foldable flat scaffolding boards 51 and 52 are used in place of the grating scaffolding 21. The other configurations are the same as those of the above embodiment.

The scaffold board 51 is made up of two trapezoidal plates 53 and 54 connected by hinges 55 and 56 fixed to the upper surface of each plate 53 and 54, so that the scaffold board 51 can be folded. It is in a state of being The hinges 55, 56 allow the plates 53, 54 to maintain the state shown and to withstand loads applied to their top surfaces. The scaffolding board 52 has a line-symmetric shape with the scaffolding board 51 when viewed from above, but is configured similarly to the scaffolding board 51. The scaffold board 51 and the scaffold board 52 form an octagonal scaffold as a whole when viewed from above.

Also in this embodiment, since the scaffold can be formed so as to cover the entire horizontal surface inside the jig assembly 43, safety during repair work etc. can be improved. Furthermore, since the scaffolding board 51 and the scaffolding board 52 are foldable, they are easy to handle and convenient to store.

In the above embodiment, the receiving frame 1 is formed into a square frame shape when viewed from above, and the four corner portions are placed on the upper surface of the flange portion 44, but the configuration of the receiving frame 1 is not limited to this. Other configurations may also be adopted as long as they are placed in contact with the flange portion 44 at three or more locations and are foldable. Furthermore, the scaffolding boards placed on the receiving frame 1 are not limited to the grating scaffolding 21 and the scaffolding boards 51 and 52 having the above configuration.

Further, the scaffolding structure according to the present invention can be used in addition to the jig assembly 43 described above, and can be used in a horizontal direction from a wall surface forming a circular cylindrical space in a plan view toward a central axis extending in a vertical direction. It can be installed on any structure that has a protruding flange.

1 Receiving frame 2, 3, 12, 13 Frame member 4 First connecting part 5, 15 Axis 6, 7, 16, 17 Connecting member 8, 9 Hinge 14 Second connecting part 21 Grating scaffolding 22, 23 Scaffolding boards 24 to 26 Support Boards 27 to 29 Bolts 30 Hinge 41 Manhole 42 Opening 43 Jig assembly 44 Flange portions 51, 52 Scaffolding boards 53, 54 Boards 55, 56 Hinge

Claims (5)

A collapsible receiving frame that is placed so as to abut at three or more places on the upper surface of a flange that protrudes horizontally toward a central axis extending vertically from a wall surface forming a circular cylindrical space in plan view. and,
A scaffold structure comprising a scaffold board placed on the receiving frame. The scaffolding structure according to claim 1, wherein the receiving frame is formed into a square frame shape. 3. The scaffold structure according to claim 1, wherein the scaffold board is a grating scaffold board that is circular in top view and is foldable into a semicircle. 3. The scaffolding structure according to claim 1, wherein the scaffolding board is a foldable flat plate. Claim 1, wherein the wall surface forming the circular cylindrical space in plan view is a wall surface of a jig assembly installed in an existing concrete manhole installed in a sewage pipe network. Or the scaffold structure according to 2.

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