JP7298886B2 - Method of installing scaffolding around tubular structure - Google Patents

Description

The present invention relates to a method of installing scaffolding around a tubular structure.

When dismantling a cylindrical structure such as a large chimney, work scaffolds are first installed around the chimney at predetermined height positions. Next, a worker on the working scaffold cuts the tubular structure at a predetermined length position from above. The cut part is suspended to the ground by a crane. By repeating this from the top to the bottom of the tubular structure, the tubular structure is dismantled.

Recently, in order to install the work scaffold more efficiently, a steel band is installed around the cylindrical structure at a predetermined height position, and the scaffold bracket is attached to the locking opening provided in the steel band. is proposed (Patent Document 1).

The scaffolding bracket has a horizontal portion at the top. Accordingly, a work scaffold can be constructed around the tubular structure by installing scaffolding boards over the horizontal portions of a plurality of scaffolding brackets installed around the tubular structure.

JP-A-2000-170376

As described above, various methods have been proposed as scaffold installation methods for dismantling tubular structures.

However, from the viewpoint of efficiency, even the conventional methods still have room for improvement.

For example, the method described in US Pat. No. 5,900,006 requires attaching steel bands along the circumference of a tubular structure at multiple heights.

Each steel band is constructed by connecting a plurality of band parts arranged along the circumferential direction with bolts. Therefore, when the diameter of the tubular structure increases, the number of necessary band parts increases, and accordingly, a large number of connecting operations are required. In particular, in the case of a large cylindrical structure whose height exceeds 60m, the number of height positions where steel bands should be installed increases, so it is necessary to connect more parts. .

SUMMARY OF THE INVENTION The present invention has been made in view of such problems, and an object of the present invention is to provide a scaffolding installation method that can be carried out more efficiently when dismantling a tubular structure. do.

In the present invention, a method for installing scaffolding around a tubular structure, comprising:
(1) a step of welding a plurality of fixing members along the periphery of the tubular structure at a predetermined height position of the tubular structure, each fixing member having an insertion port; ,
(2) preparing a scaffolding bracket having a protruding member and a horizontal member, and inserting the protruding member of the scaffolding bracket into the insertion opening of each fixing member; , wherein the horizontal members of the scaffolding bracket are radially projected;
(3) installing a scaffolding member using the horizontal member of the scaffolding bracket;
A method is provided, comprising:

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a scaffolding installation method that can be carried out more efficiently when dismantling a tubular structure.

FIG. 4 is a diagram schematically showing the flow of a method for installing scaffolding according to an embodiment of the present invention; It is the figure which showed an example of a cylindrical structure typically. 1 is a schematic perspective view of a fixing member utilized in a method of installing scaffolding according to an embodiment of the present invention; FIG. 1 is a top view schematically showing a step of a method of installing scaffolding according to an embodiment of the present invention; FIG. 1 is a schematic side view of a scaffolding bracket utilized in a method of installing scaffolding according to one embodiment of the present invention; FIG. 1 is a top view schematically showing a step of a method of installing scaffolding according to an embodiment of the present invention; FIG. 1 is a top view schematically showing a step of a method of installing scaffolding according to an embodiment of the present invention; FIG.

The present invention will be described below with reference to the drawings.

(Method of installing scaffolding for demolition of cylindrical structure according to one embodiment of the present invention)
FIG. 1 schematically shows a flow of a method of installing scaffolding (hereinafter referred to as "first installation method") according to an embodiment of the present invention.

As shown in Figure 1, the first installation method is:
(1) A step of welding fixing members at predetermined intervals along the circumference of the cylindrical structure at predetermined height positions of the cylindrical structure, wherein the fixing members have insertion openings. , a step (step S110);
(2) preparing a scaffolding bracket having a protruding member and a horizontal member, and inserting the protruding member of the scaffolding bracket into the insertion opening of each fixing member; , the horizontal members of the scaffolding bracket are radially projected (step S120);
(3) installing a scaffolding member using the horizontal member of the scaffolding bracket (step S130);
have

Each step will be described in detail below with reference to FIGS.

(Step S110)
FIG. 2 schematically shows an example of the configuration of the tubular structure 1 to which the first installation method is applied.

In the example shown in FIG. 2, the tubular structure 1 comprises a steel chimney. The height of the tubular structure 1 is not particularly limited, but is, for example, in the range of 60m to 250m, or may exceed 250m.

In addition, in FIG. 2 , a steel tower 20 is shown around the tubular structure 1 . When the cylindrical structure 1 is a tall steel chimney, it is difficult to make the cylindrical structure 1 stand on its own, so such a steel tower support type is generally adopted.

However, as a method of installing a scaffold for dismantling the steel tower 20, a conventional method can be adopted. Therefore, the description of the method of installing the scaffolding for dismantling the steel tower 20 is omitted here. Generally, when dismantling the pylon-supported cylindrical structure 1, both the pylon structure 1 and the pylon 20 are dismantled simultaneously. That is, both are dismantled from above, with the height levels similarly decreasing.

When installing a scaffold for dismantling the tubular structure 1 , first, a fixing member is installed around the tubular structure 1 . The fixing member is installed on the outer peripheral surface of the tubular structure 1 by welding.

FIG. 3 schematically shows one form of the fixing member 110. As shown in FIG.

As shown in FIG. 3, the fixing member 110 is composed of a metal band 115 and has a projection for the insertion port 120 in the central portion in the longitudinal direction. The metal strip 115 is made of a material that can be welded to the outer peripheral surface of the tubular structure 1, such as steel.

Furthermore, the fixing member 110 may have one or more holes 125 in the protrusion for the insertion port 120 . However, hole 125 is not an essential configuration.

A plurality of fixing members 110 are installed along the outer peripheral surface at a predetermined height level of the tubular structure 1 . Generally, there are multiple height levels at which the securing member 110 is installed. For example, all necessary fixing members 110 may be installed from the top end to the bottom surface of the cylindrical structure 1 before dismantling is started.

When the fixing members 110 are installed at multiple height levels of the tubular structure 1, the height intervals may range, for example, from 5 m to 30 m.

Note that the uppermost fixing member 110 may be installed at the tip of the tubular structure 1 or the top of the steel tower 20 .

FIG. 4 schematically shows a state in which the fixing member 110 is installed around the tubular structure 1 at a certain height level.

In the example shown in FIG. 4, 12 fixing members 110 are installed on the outer peripheral surface 5 of the cylindrical structure 1 at regular intervals. However, the number of fixing members 110 to be installed is appropriately selected according to the dimensions of the outer peripheral surface 5 of the tubular structure 1 .

Typically, at each height level, the fixing members 110 are spaced apart from each other by 0.3 m to 1 m along the circumferential direction.

(Step S120)
A scaffolding bracket is then installed in each outlet 120 of the securing member 110 .

FIG. 5 schematically shows an example of the configuration of the scaffolding bracket 140. As shown in FIG. A side view of the scaffolding bracket 140 is shown in FIG.

As shown in FIG. 5, scaffolding bracket 140 has projecting member 142 , horizontal member 144 , vertical member 146 and diagonal member 148 . Each member of the scaffolding bracket 140 is made of steel.

The projecting member 142 has a substantially plate-like shape extending in the vertical direction. One or two or more through holes 143 may be formed in the protruding member 142 at predetermined positions. However, the through hole 143 does not necessarily need to be installed and may be omitted.

The horizontal member 144 has a substantially prismatic shape extending in the horizontal direction. The vertical member 146 has a substantially prismatic shape extending in the vertical direction.

One end of horizontal member 144 is joined to projecting member 142 and the other end of horizontal member 144 is joined to diagonal member 148 . The vertical member 146 is joined to the longitudinal middle portion of the horizontal member 144 . A contact member 150 is installed at the lower end of the diagonal member 148 .

As will be described later, when the scaffolding bracket 140 is attached to the insertion port 120 of the fixing member 110, the abutting member 150 is brought into contact with the outer peripheral surface 5 of the tubular structure 1, and the scaffolding bracket It has a role to stabilize 140.

However, the contact member 150 is an optional member, and the scaffolding bracket 140 does not necessarily have the contact member 150 .

When attaching the scaffolding bracket 140 to the fixing member 110 , the projecting member 142 of the scaffolding bracket 140 is inserted downward from above into the insertion opening 120 of the fixing member 110 .

Accordingly, the scaffolding bracket 140 is attached to the fixing member 110 , and the scaffolding bracket 140 can be supported by the fixing member 110 .

At this time, a stop pin (not shown) may be inserted into the through hole 143 of the scaffolding bracket 140 so as to pass through the hole 125 of the fixing member 110 . By inserting the stop pin, it is possible to prevent the scaffolding bracket 140 from being detached from the fixing member 110 at unintended timing.

FIG. 6 schematically shows a state in which the scaffolding bracket 140 is attached to the fixing member 110. As shown in FIG.

As shown in FIG. 6 , as a result of mounting the scaffolding bracket 140 , the horizontal members 144 of the scaffolding bracket 140 radially protrude from the outer peripheral surface 5 of the tubular structure 1 .

(Step S130)
The scaffolding members are then placed on the horizontal members 144 of the scaffolding brackets 140 and interconnected to form the scaffolding.

The configuration and shape of the scaffold member are not particularly limited. The scaffolding member may be, for example, aluminum flooring. For example, a scaffolding may be constructed by laying flooring over the horizontal members 144 .

FIG. 7 schematically shows a state in which the floor material 180 is installed on the horizontal member 144 of the scaffolding bracket 140. As shown in FIG. By installing the floor material 180 on the horizontal member 144 , a doughnut-shaped scaffolding 185 can be configured over the outer peripheral surface 5 of the tubular structure 1 .

In addition, in the example shown in FIG. 7, the scaffolding 185 is configured by combining floor materials 180 having two types of shapes. However, scaffolding 185 may be configured using more types of flooring 180 .

Scaffolding 185 may also have stanchions and/or handrails (not shown).

Through the steps described above, the scaffolding 185 can be installed at a predetermined height level of the tubular structure 1 .

The first method of installation allows scaffolding 185 to be constructed without the use of conventional steel bands. In the first installation method, it is possible to install the scaffolding 185 more efficiently without the need to connect the band parts to each other.

Also, in the first installation method, the scaffolding bracket 140 is used by inserting the projecting member 142 into the insertion port 120 of the fixing member 110 . Therefore, the used scaffolding bracket 140 can be easily recovered by pulling out the protruding member 142 from the insertion opening 120 . Therefore, the scaffold bracket 140 can be reused.

Such a scaffolding 185 may be used for dismantling the tubular structure 1 .

Dismantling of the tubular structure 1 may be carried out as follows.

First, the fixing members 110 and the scaffolding brackets 140 are installed at all necessary height levels on the outer peripheral surface of the cylindrical structure 1 to construct all the scaffoldings 185 .

Next, a worker stands on the first scaffold, which is usually the top, and cuts the tubular structure 1 across the outer peripheral surface 5 at the first height position by the worker. The first portion of the cut tubular structure 1 is suspended to the ground by a crane.

Next, a worker standing on a second scaffolding cuts the tubular structure 1 at a second height position in a similar manner. The cut second portion is suspended to the ground by a crane.

By repeating such steps, the cylindrical structure 1 may be dismantled.

Alternatively, first, the fixing member 110 and the scaffolding bracket 140 are installed at one height level on the upper outer peripheral surface of the cylindrical structure 1, and the first scaffolding 185 is constructed at the first height level.

Next, a worker stands on the first scaffolding 185, and the worker cuts the cylindrical structure 1 along the outer peripheral surface 5 at the first height position. The cut first portion of the tubular structure 1 is suspended to the ground by a crane.

A second scaffolding 185 is then constructed at a second height level in a similar manner. Further, a worker standing on the second scaffolding 185 cuts the cylindrical structure 1 along the outer peripheral surface 5 at the second height position. The second portion of the cut tubular structure 1 is suspended to the ground by a crane.

By repeating such steps, the cylindrical structure 1 may be dismantled.

In addition, when the steel tower 20 exists around the cylindrical structure 1 as shown in FIG.

Therefore, scaffolding is also constructed around the steel tower 20 . The scaffolding for this pylon 20 may be constructed in any manner.

A method for installing scaffolding according to an embodiment of the present invention has been described above. However, one embodiment of the present invention is not limited to the above aspect.

For example, in the above example, a steel chimney was assumed as the tubular structure 1, but the tubular structure 1 may be a building such as a tower.

Further, the scaffolding 185 does not necessarily need to be used only for dismantling the tubular structure 1. For example, the scaffolding 185 can also be applied when the tubular structure 1 is painted or repaired.

Additionally, the configuration of the securing members 110 and scaffolding brackets 140 shown is merely one example. The scaffolding bracket 140 may have any configuration as long as it can be attached to the fixing member 110 and the scaffolding 185 can be installed thereon.

In addition, various modifications are possible.

1 Cylindrical Structure 5 Peripheral Surface 20 Steel Tower 110 Fixing Member 115 Metal Band 120 Insertion Port 125 Hole 140 Scaffolding Bracket 142 Protruding Member 143 Through Hole 144 Horizontal Member 146 Vertical Member 148 Diagonal Member 150 Contact Member 180 Floor Material 185 Scaffolding

Claims (2)

A method for installing scaffolding around a cylindrical structure, comprising:
The tubular structure is a steel chimney with a height of more than 60 m,
The method is
(1) A step of welding a plurality of fixing members along the periphery of a tubular structure at a predetermined height position of the tubular structure, each fixing member having a projection for an insertion port. a step of having a substantially belt-like form, wherein the convex portion is formed with a hole ;
(2) A step of preparing a protruding member having a through-hole and a scaffolding bracket having a horizontal member, and inserting the protruding member of the scaffolding bracket into the insertion port of each fixing member, wherein the through-hole has the hole a step of fixing the scaffolding bracket to the fixing member by inserting a pin so as to pass through the scaffolding bracket so that the horizontal member of the scaffolding bracket protrudes radially from the circumference of the tubular structure;
(3) installing a scaffolding member using the horizontal member of the scaffolding bracket;
A method. said scaffolding bracket having a diagonal member connected to the distal end of said horizontal member;
2. The method of claim 1 , wherein the diagonal member has an abutment member below the protruding member that abuts the outer surface of the tubular structure.

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