JP5737571B2 - Dismantling method - Google Patents

Description

  The present invention relates to a dismantling method. More specifically, the present invention relates to a method for dismantling towers such as radio towers.

Conventionally, as a radio tower or the like, a steel tower 100 configured by connecting steel pipe columns 110 vertically as shown in FIG. 9A is often used.
The steel tower 100, for example, lifts a new steel pipe pillar 110 with a crane or the like attached to the existing steel pipe pillar 110, installs it on the existing steel pipe pillar 110, connects them, and constructs them in order from the bottom (non-patent) However, the dismantling of the tower 100 can be performed by the reverse operation. That is, a crane or a simpler dismantling support column is attached to the lower steel pipe column 110, and the upper steel pipe column 110 is lifted from above and then lowered. Thus, the steel pipe pillar 110 is removed in order from the top, and the steel tower 100 is disassembled.

  FIG. 9B shows an example in which the dismantling support column is attached. In FIG. 9 (b), a dismantling column 200 having a pulley 210 on the upper side is attached to the lower steel tube column 110 to be removed, and the upper steel tube column 110 is lifted by a wire 300 hung on the pulley 210. Thereafter, the steel pipe column 110 unwound by unwinding the wire 300 is lowered.

“Transmission Line Construction Standards Manual”, p. 164, Shubunsha, 1991

  However, carrying the crane or the dismantling strut 200 to the steel tower 100 and attaching it is a burden of work. In particular, a radio tower is often installed on a mountain with no road, and it is difficult to carry and install cranes and dismantling struts 200, and a dismantling method that saves labor and facilitates the work is desired. It was rare.

  The present invention has been made in view of the above-described problems, and an object thereof is to provide a tower dismantling method that is easy to work.

The present invention for achieving the above-mentioned object is a method for disassembling a tower-like body constituted by vertically connecting pillars having flange portions at the upper end and the lower end, wherein the upper and lower pillars are replaced by upper pillars. A first wire is attached to the upper end of the upper column, a second wire is attached to the upper column, and the second wire is held at the upper end of the lower column so as to be movable up and down . With the flange connected so that the column can be tilted , the upper wire is tilted by winding the first wire and unwinding the second wire , The dismantling method is characterized in that the upper column body is lowered.

According to this dismantling method, the column body is tilted and then lowered when performing the dismantling work, so there is no need to lift the column body from above using a crane or dismantling column, and the crane or dismantling column is transported. This eliminates the need for mounting, etc., and saves work on dismantling. In addition, since the upper column body is tilted after connecting the flange portions of the upper and lower column bodies, the behavior of the column body at the time of tilting is stabilized and the work can be performed reliably and safely. Further, since the column body is tilted by winding and unwinding the wire, the column body can be tilted from the ground, and the work becomes easy. Furthermore, since the wire to be unwound does not come off in an unintended direction when the column body is tilted, the column body can be tilted more reliably and safely.

In the disassembling method of the present invention, the flange portion has a hole portion, a ring-shaped through the hole of the flange portion of the upper end of the hole and the lower side of the cylindrical body of the flange portion of the lower end of the upper cylindrical body It is desirable to attach the connecting tool to the upper body and to tilt the upper column, and then remove the connecting tool.

  According to this disassembling method, since the connecting tool is passed through the hole portion of the flange portion and the flange portions of the upper and lower column bodies are connected to each other, the upper column body is the lower column body when the column body is tilted. There is no such thing as sudden falling off of it. The attachment of the connecting tool is also easy because a hole of the existing flange is used and no special jig is required.

  Further, in the disassembling method of the present invention, it is desirable that the flange portion has a hole portion, and the first wire and the second wire are attached using the hole portion.

  In this disassembling method, since the wire is attached using the holes of the already existing flange portion, the wire attaching operation is facilitated.

  In the disassembling method of the present invention, it is desirable to use a plurality of the second wires.

  In this dismantling method, the direction in which the upper column body tilts can be controlled by adjusting the unwinding amount of each second wire, so that the behavior when the column body tilts is more stable. For example, if three wires are attached to the upper column at different positions on the plane, the behavior of the column on the plane can be easily controlled by the tension of the wires.

The disassembling method of the present invention, the after tilt the upper pillar, multiplied by the middle of the first wire pulley attached to pillar of the lower, the second wire of said upper cylindrical body It is desirable that the first wire is unwound, the first wire is unwound, and the upper column body is lowered.

  In this dismantling method, the column lowering operation can be performed only by unwinding the first wire, and the operation becomes easy. Further, since the first wire is in a state where the column body is suspended through the pulley, the wire can be unwound smoothly.

  In the disassembling method of the present invention, it is desirable that the first wire is attached to a lower end portion of the upper column body when the upper column body is lowered.

  In this dismantling method, the column body is lowered by attaching wires to the upper end portion and the lower end portion. Therefore, the column body can be lowered while maintaining the posture of the column body, and the work can be performed more reliably and safely.

  According to the present invention, it is possible to provide a method for dismantling a tower body that does not require transportation and attachment of a crane or a dismantling column, and is easy to work.

The figure which shows the steel tower 1 The figure explaining the dismantling method of 1st Embodiment The figure explaining the dismantling method of 1st Embodiment The figure explaining the dismantling method of 1st Embodiment Diagram showing wire attachment process The figure which shows the process of hanging the wire 23c on the pulley 49 The figure explaining the dismantling method of 2nd Embodiment The figure explaining the dismantling method of 3rd Embodiment The figure shown about the dismantling of the steel tower 100

[First Embodiment]
First, with reference to FIGS. 1-6, 1st Embodiment of the dismantling method of this invention is described. FIG. 1 is a diagram showing a steel tower 1 which is a tower-like body dismantled by the dismantling method of the present invention. FIG. 1A is a view of the steel tower 1 as viewed from the side, and FIG. 1B is a view showing a steel pipe column 10 constituting the steel tower 1. Here, the steel tower 1 is a radio tower that transmits and receives radio waves.

  As shown in FIG. 1 (a), the steel tower 1 is composed of a base 3, a column 5, a column 9, and the like. The base 3 is provided in the ground, and a part thereof is exposed on the ground 2. The column portion 5 is provided on the base portion 3. The column part 5 is configured by connecting a plurality of steel pipe columns 10 that are column bodies vertically. The steel pipe pillar 10 which comprises the pillar part 5 is set to 10-1 to 10-5 in order from the top. The steel pipe column 10 has an upper flange 13a at the upper end and a lower flange 13b at the lower end. In addition, an antenna 6 is provided at an intermediate part of the column part 5, and an antenna 7 and a lightning rod 8 are provided at the top part. The support column 9 is provided so as to connect the intermediate portion of the column portion 5 and the base portion 3.

FIG. 1B is a diagram showing the steel pipe column 10.
A plurality of holes 17 for bolt connection are provided at equal intervals in the circumferential direction on the upper flange 13a and the lower flange 13b of the steel pipe column 10. A rib flange 15a is provided at the upper end portion of the steel pipe column 10 so as to connect the side surface of the steel pipe column 10 and the upper flange 13a, and the side surface of the steel pipe column 10 and the lower flange 13b are provided at the lower end portion of the steel pipe column 10. A rib flange 15b is provided so as to be connected.

  The upper and lower steel pipe columns 10 are connected by passing bolts 18 through the holes 17 of the upper flange 13 a of the lower steel pipe column 10 and the lower flange 13 b of the upper steel pipe column 10 and tightening the upper ends with nuts 19.

  Next, a method for dismantling the steel tower 1 will be described with reference to FIGS.

In dismantling the steel tower 1, first, the antennas 6 and 7, the lightning rod 8, and the cable of the steel tower 1 are removed.
Next, as shown in FIG. 2 (a), a chill hole (registered trademark, hereinafter omitted) 21, which is a small winch, is installed around the steel tower 1, fixed to the ground 2 with an anchor 22, and unwound from the chill hole 21. The end of the wire 23 is attached to the upper flange 13a of the uppermost steel pipe column 10-1. Furthermore, the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the lower steel pipe column 10-2 are connected by a wire 33 (connector).

The above-described wire attachment process will be described in detail with reference to FIG.
Fig.5 (a) is the figure which looked at Fig.2 (a) from the upper direction. 5B is a cross-sectional view taken along line AA in FIG. 2A, FIG. 5C is a perspective view showing a range B in FIG. 2A, and FIG. 5D is FIG. It is a perspective view which shows the range C of (a).

  As shown in FIG. 5 (a), three chill holes 21 (21a, 21b, 21c) are arranged around the steel tower 1 at intervals of about 120 ° in the circumferential direction. From the chill holes 21a, 21b, 21c, wires 23a, 23b (second wire), 23c (first wire) are unwound toward the steel tower 1, respectively. Of these wires, the wire 23c is a “first wire” that is wound when the steel pipe column 10-1 is tilted as described later, and the wires 23a and 23b are “second wires” that are unwound.

  On the other hand, in the steel tower 1, as shown in the left figure of FIG.5 (b), the bolt 18 used for the connection of the upper flange 13a and the lower flange 13b by the steel pipe pillars 10-1 to 10-5 is about 120 degree intervals. Remove in two places and leave holes 17a, 17b. Then, the wires 23a and 23b are hung on a pulley 32 (see FIG. 2A) attached to the lower portion of the column portion 5, and as shown in the right view of FIG. 5B, the wires 23a and 17b are inserted into the holes 17a and 17b. 23b is pulled up along the column part 5 while passing through each.

The wires 23a, 23b and the wire 23c are attached to the upper flange 13a of the steel pipe column 10-1 by using a wire attaching shackle.
At this time, as shown in FIG. 5 (c), the shackles 31a, 31b, 31c are respectively attached to the three holes 17a ′, 17b ′, 17c ′ at intervals of 120 ° of the upper flange 13a, and the wires 23a, 23b are attached. , 23c are connected to the shackles 31a, 31b, 31c, respectively.
The positions of the holes 17a ′ and 17b ′ in the flange plane correspond to the holes 17a and 17b through which the wires 23a and 23b are passed, respectively.

Furthermore, as shown in FIG. 5 (d), the bolt 18 connecting the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the steel pipe column 10-2 is removed at one place in the hole 17d which is vacated, The wire 33 is wound around in a ring shape. The position of the hole 17d in the flange plane corresponds to the hole 17c ′.
Finally, tension is applied to the wires 23a, 23b, and 23c to fix the steel pipe column 10-1, and the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the steel pipe column 10-2 shown in FIG. Remove any remaining bolts 18 connecting

  When the wire 23c is wound up and the wires 23a and 23b are unwound evenly from the state of FIG. 2A, the steel pipe column 10-1 gradually tilts as shown in FIG. 2B. . The steel pipe column 10-1 tilts around the wire 33 connecting the flanges of the upper and lower steel pipe columns 10-1, 10-2. Further, the wires 23a and 23b are passed through the hole 17 of the upper flange 13a of the steel pipe column 10-2, and are held so as to be movable up and down.

  After the steel pipe column 10-1 is tilted and turned upside down, the lever hoist 41 is attached to the upper flange 13a of the steel pipe column 10-2, as shown in FIG. Pull the column 10-1 and fix it. Next, as shown in FIG. 3 (b), a pulley 49 is attached to the upper flange 13 a of the steel pipe column 10-2, the middle of the wire 23 c is pulled up and hung on the pulley 49, and the wire 23 c is connected to the steel tube column via the pulley 49. 10-1 is suspended.

  With reference to FIG. 6, the above-described process of placing the wire 23c on the pulley 49 will be described in detail. 6 (a) to 6 (d) are diagrams for explaining each procedure. The lower diagram is a view of the side surfaces of the steel pipe columns 10-1 and 10-2, and the upper diagram is the diagram of the steel pipe columns 10-1 and 10-2. It is the figure which looked at the upper surface.

First, as shown in FIG. 6A, the shackle 37 is attached to the two holes 17 of the upper flange 13 a of the steel pipe column 10-2, and the lever hoist 41 is suspended from the shackle 37 by the wire 39.
Then, the wire 43 is wound around the steel pipe column 10-1 that is tilted while passing through the hook 41 a of the lever hoist 41.

Next, as shown in FIG. 6B, the shackle 45 is attached to the hole 17 of the upper flange 13 a of the steel pipe column 10-2, and the pulley 49 is suspended from the shackle 45 by the wire 47. Moreover, the shackle 51 is also attached to the hole 17 of the lower flange 13b of the steel pipe column 10-1.
And the wire 23c is unwound, the middle is pulled up, it passes through the shackle 51, is attached to the lower flange 13b of the steel pipe column 10-1, and is hung on the pulley 49.

  Then, as shown in FIG.6 (c), wires 23a and 23b are removed from the upper flange 13a of the steel pipe column 10-1, and the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the steel pipe column 10-2 are connected. The wire 33 that has been cut is cut and removed.

  Thereafter, the lever hoist 41 is wound down to slightly lower the steel pipe column 10-1, and when the wire 23c is hung down on the pulley 49 as shown in FIG. The shackle 37 is further removed, and the steel pipe column 10-1 is hung by the wire 23c hung on the pulley 49. The removed wires 23a and 23b are attached to the upper flange 13a of the steel pipe column 10-2 using a shackle as in FIG. 5C. This state is shown in FIG.

From this state, the wire 23c is continuously unwound to lower the steel pipe column 10-1 and lower it to the ground 2 as shown in FIG.
Thereafter, the wire 23c is removed from the steel pipe column 10-1 and wound up, and is attached to the upper flange 13a of the steel pipe column 10-2 using a shackle as in FIG. When the lower flange 13b of the steel pipe column 10-2 and the upper flange 13a of the steel pipe column 10-3 are connected with a flange connecting wire, as in FIG. 5 (d), the same state as in FIG. 2 (a) is obtained. Therefore, thereafter, the same procedure is repeated, and the tower 1 can be disassembled by descending downward in order from the uppermost steel pipe column.

  As described above, according to the present embodiment, when the steel tower 1 is disassembled, it is not necessary to transport and attach a crane, a dismantling column, or the like as in the prior art, and labor is saved. Moreover, since the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the lower steel pipe column 10-2 are connected by the wire 33 and the steel pipe column 10-1 is tilted, the steel pipe column 10-1 at the time of tilting is tilted. Thus, the upper steel pipe column 10-1 does not come off the lower steel pipe column 10-2 and falls suddenly, and the operation can be performed reliably and safely.

Moreover, since the wire 23 and the wire 33 are attached using the hole 17 of the flange of the steel pipe pillar 10-1 or the steel pipe pillar 10-2, the attachment operation | work becomes easy.
Instead of using the hole 17, it is also possible to attach a wire 23 or the like by providing a wire attachment jig at the upper end or lower end of the steel pipe column 10-1 or the steel pipe column 10-2. .

  In addition, when the steel pipe column 10-1 is tilted, the three wires 23a, 23b, 23c are attached to the upper flange 13a at intervals of 120 °, and the wire 23c is taken up while the wires 23a, 23b are unwound. The behavior on the plane when the column 10-1 is tilted can be stabilized, and the column 10-1 does not fall in an unintended direction. In the present embodiment, the interval at which the wires 23a and 23b are attached is 120 °, but the interval can be determined as appropriate, and may be 90 °, for example. The same applies to the arrangement intervals of the chill holes 21a, 21b, and 21c.

  Moreover, since the wires 23a and 23b are passed through the hole 17 of the upper flange 13a of the steel pipe column 10-2 and are held so as to be movable up and down, they are arranged along the steel tower 1 even when the steel pipe column 10-1 is tilted. The tilting operation of the steel pipe column 10-1 can be performed more reliably and safely without deviating in an unintended direction. In addition, it is also possible to provide a holder at the upper end of the steel pipe column 10-2 and hold the wire 23a and the like in the same manner.

  Furthermore, after tilting the steel pipe column 10-1, the wire 23c is hung on the pulley 49 attached to the upper flange 13a of the steel pipe column 10-2, and the steel pipe column 10-1 is lowered only by unwinding the wire 23c. The descending work of the column 10-1 becomes easy. In addition, when the steel pipe column 10-1 is lowered, the wire 23c is also attached to the lower flange 13b of the steel pipe column 10-1, so that the posture of the steel pipe column 10-1 during the descent is maintained and the lowering operation is more reliable and safe. become.

[Second Embodiment]
Next, a second embodiment of the present invention will be described with reference to FIG. 7 (a) and 7 (d) are diagrams showing the procedure of the dismantling method of the second embodiment, and FIGS. 7 (b) and 7 (c) show the range D in FIG. 7 (a), respectively. 10 is a perspective view showing a range E. FIG. Elements having substantially the same configuration as those of the first embodiment are denoted by the same reference numerals and description thereof is omitted.

2nd Embodiment differs in the operation | work which attaches a wire to the uppermost steel pipe pillar 10-1.
Fig.7 (a) is a figure which shows the state which attached the wires 23a, 23b, and 23c to the steel pipe pillar 10-1. In the second embodiment, the chill holes 21a and 21b are arranged linearly with the chill hole 21c with the steel tower 1 interposed therebetween.

  Moreover, as shown in FIG.7 (b), in 2nd Embodiment, the two wires 23a and 23c are attached to the upper flange 13a of the steel pipe pillar 10-1 with the shackles 31a and 31c. The hole 17e 'for attaching the shackle 31a is spaced 180 ° from the hole 17c' for attaching the shackle 31c.

Further, as shown in FIG. 7 (c), in the second embodiment, the ring 61 (connector) is passed through the hole 17d and the lower flange 13b of the steel pipe column 10-1 and the upper flange of the steel pipe column 10-2. Connect 13a.
Further, the wire 23b is attached using the fastener 63 after passing through the hole 17f ′ of the lower flange 13b of the steel pipe column 10-1 after slightly tilting the steel pipe column 10-1 using the wires 23a and 23c. The position of the hole 17f ′ on the flange plane corresponds to the hole 17e ′.

  When the wire 23c is wound up and the wires 23a and 23b are unwound from the state shown in FIG. 7A, the steel pipe column 10-1 is tilted, and is turned upside down as shown in FIG. 7D. . Thereafter, the steel pipe column 10-1 can be lowered in the same procedure as in the first embodiment.

  Also in this embodiment, the dismantling work of the steel tower 1 is labor-saving similarly to 1st Embodiment, the behavior of the steel pipe pillar 10-1 at the time of tilting is also stabilized, and a work can be performed reliably and safely.

[Third Embodiment]
Next, a third embodiment of the present invention will be described with reference to FIG. 8 (a) and 8 (d) are diagrams showing the procedure of the dismantling method of the third embodiment, and FIG. 8 (b) and FIG. 8 (c) show the range F in FIG. 8 (a), respectively. 4 is a perspective view showing a range G. FIG. FIG. 8E is a view of the range H in FIG. 8D as viewed from above. Elements having substantially the same configuration as those of the first and second embodiments are denoted by the same reference numerals and description thereof is omitted.

  In the third embodiment, unlike the first and second embodiments, the steel tower 1 is disassembled using two wires 23a and 23c. The chill holes 21a and 21c are arranged in a straight line with the steel tower 1 in between. Fig.8 (a) is a figure which shows the state which attached the wires 23a and 23c to the uppermost steel pipe pillar 10-1.

As shown in FIG. 8B, in the third embodiment, only the wire 23c is attached to the upper flange 13a of the steel pipe column 10-1 by the shackle 31c.
On the other hand, the method of attaching the wire 23a is also different. As shown in FIG. 8 (c), the bolt 18 connecting the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the steel pipe column 10-2 is removed at one place and opened to the hole 17g ′. The end portion is attached using the fastener 65 through the wire 23a pulled up from the end. Thereafter, when the remaining bolts 18 are removed, the lower flange 13b of the steel pipe column 10-1 and the upper flange 13a of the steel pipe column 10-2 are connected by the wire 23a and the fastener 65. The hole 17g ′ is in a positional relationship on a plane that forms an interval of 180 ° with the hole 17c ′ to which the shackle 31c is attached.

Thereafter, as shown in FIGS. 8D and 8E, the wire 23c is wound up while the wire 23a is unwound and the steel pipe column 10-1 is slightly tilted, and then a roller is attached to the upper flange 13a of the steel pipe column 10-2. 67 is attached.
Then, the wire 23a is hung on the roller 67, and then the wire 23a is unwound and the wire 23c is wound to lower the steel pipe column 10-1. The steel pipe column 10-1 descends while moving toward the chill hole 21c.

  Also in the present embodiment, as in the first and second embodiments, the dismantling work of the steel tower 1 is saved, and the work can be performed reliably and safely. Further, when the steel pipe column 10-1 is lowered, the wire 23a is drawn while being hung on the roller 67, so that the wire 23a can be easily drawn.

The preferred embodiments of the dismantling method and the like according to the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It will be apparent to those skilled in the art that various changes or modifications can be conceived within the scope of the technical idea disclosed in the present application, and these naturally belong to the technical scope of the present invention. Understood.
For example, the dismantling method of the present invention has been described using the example of dismantling the steel tower 1 which is a radio tower, but the present invention is not limited to this and can be applied to dismantling various towers.

1, 100 ......... Tower 10, 110 ......... Steel tube column 13a ......... Upper flange 13b ......... Lower flange 23, 23a, 23b, 23c, 33, 300 ......... Wire 49 ......... Purley 61 ... …ring

Claims (6)

It is a dismantling method of a tower-like body configured by vertically connecting pillars having flange portions at the upper end and the lower end,
The upper and lower pillars
Attach the first wire to the upper end of the upper column,
A second wire is attached to the upper pillar,
Holding the second wire movably up and down at the upper end of the lower column,
The upper column body is tilted by winding the first wire and unwinding the second wire in a state where the upper column body is connected by a flange so that the upper column body can be tilted. Then, the dismantling method, wherein the upper column body is lowered. The flange portion has a hole,
Mounting the fitting to the ring through the hole portion of the flange portion of the upper end of the hole and the lower side of the cylindrical body of the flange portion of the lower end of said upper column body,
The disassembly method according to claim 1, wherein the connection tool is removed after the upper column body is tilted. The flange portion has a hole,
The first wire, demolition method according to claim 1 or claim 2 wherein the second wire is characterized in that it is fitted with the hole. The disassembly method according to any one of claims 1 to 3, wherein a plurality of the second wires are used. After tilting the upper pillar, multiplied by the middle of the first wire pulley attached to pillar of the lower, detached the second wire from the upper side of the cylindrical body, the first unwinding a wire, demolition method according to any one of claims 1 to 4, characterized in that unloading the upper pillar. 6. The disassembling method according to claim 5 , wherein when the upper column body is lowered, the first wire is attached to a lower end portion of the upper column body.

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