JP2016094734A - Method and device for demolishing steel tower - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for demolishing a steel tower that allows a crown part of the tower to be demolished safely, and eliminates a need to use a large-scale facility.SOLUTION: A demolition method for a steel tower of the present invention is for demolishing a steel tower 1 having a body part 4, and a crown part 2 at a top edge of the body part 4. The demolition method includes the steps for separating the crown part 2 from the body part 4, supporting the separated crown part 2 above the body part 4, demolishing the body part 4 in a downward direction starting from the top edge of the body part 4, at the same time lowering the crown part 2, and demolishing the crown part 2 that has been lowered.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method of dismantling a steel tower that disassembles a steel tower including a top portion having an antenna or the like, and a steel tower dismantling apparatus.

  Japanese Patent Application Laid-Open No. 2002-220945 describes a dismantling apparatus for dismantling a steel tower provided with an antenna at the top, and a dismantling method of the steel tower using this dismantling apparatus. This dismantling apparatus includes a base stage and an upper stage that are mounted on a steel tower independently of each other, and hydraulic jacks are interposed between the base stage and the upper stage. The upper stage can be raised by extending the hydraulic jack while the base stage is supported by the steel tower, and the base stage can be raised by reducing the hydraulic jack while the upper stage is supported by the steel tower. It is possible. In the dismantling method described in the above publication, the dismantling of the steel tower is sequentially progressed downward from the antenna at the top of the steel tower using such a dismantling apparatus.

  Japanese Patent Application Laid-Open No. 2010-242362 describes a method of dismantling a steel tower including an upper structure of a building having an antenna tower and an SRC building lower structure having an observation floor. In this dismantling method, the observation floor of the lower building of the building is used as a support frame and the upper building of the building is jacked down to sequentially dismantle the upper building of the building from below. The dismantling work is performed by lowering the building upper frame while cutting it with a center hole jack provided on a construction frame surrounding the building upper frame.

JP 2002-220945 A JP 2010-242362 A

  In the method of dismantling the steel tower from the antenna at the top of the steel tower sequentially downward, the antenna is first disassembled at the top of the steel tower, so that there is a problem that it is difficult to perform the work of dismantling the top safely. In addition, the method of sequentially lowering the upper structure of the building by jackdown along with the dismantling of the steel tower has a problem that equipment for preventing a fall from an earthquake and equipment for large-scale jackdown are necessary.

  It is an object of the present invention to provide a tower demolition method and a tower demolition apparatus that can safely perform the dismantling of the top and can eliminate the need for large-scale equipment.

  A method for disassembling a steel tower according to the present invention is a method for disassembling a steel tower comprising a main body and a top located at the upper end of the main body, and a step of separating the top from the main body, and the separated top above the main body. A step of supporting, a step of disassembling the main body portion downward from the upper end of the main body portion, a step of moving the top portion downward, and a step of disassembling the top portion moved downward.

  In the method of dismantling the steel tower according to the present invention, the top of the steel tower and the main body are separated, and the main body is sequentially disassembled downward while supporting the separated top. Then, the main body part is sequentially disassembled from the upper end of the main body part downward, and after the top part is moved downward, the top part is disassembled. Thus, since the top is disassembled at a lower position, the work of disassembling the top can be performed safely. Moreover, generally, the cross-sectional area of a steel tower becomes large as it goes below. Therefore, in the dismantling method according to the present invention, since dismantling is proceeding downward from the upper end of the main body, dismantling is proceeded from a portion where the cross-sectional area of the steel tower is small to a large portion. In this way, the dismantling work proceeds downward from the upper end of the main body having a small cross-sectional area, so that large equipment such as a jack device can be dispensed with.

  The tower demolition apparatus according to the present invention is a tower demolition apparatus used in the above-described demolition method, and moves the top separated from the main body upward with respect to the main body and supports the moved top. A suspension member having a support member and a horizontal portion movable between the top portion supported by the support member and the main body portion, and the iron material of the disassembled main body portion suspended from the suspension portion and moved downward. A crane member.

  The steel tower disassembly apparatus according to the present invention includes a support member that supports the top portion in a state where the top portion is moved upward with respect to the main body portion, and a crane member that moves the iron material of the disassembled main body portion downward. By using the support member and the crane member, the dismantling work can proceed. Therefore, a large jack device or the like can be eliminated. Further, in this dismantling apparatus, the dismantling operation can be performed simply by dismantling the main body portion from the top and moving the iron material downward by the crane member, so that the dismantling operation can be easily performed. Furthermore, in this dismantling apparatus, the main body can be disassembled sequentially from the top and the top can be moved downward, and then the top can be disassembled. Therefore, since the top dismantling operation can be performed at a lower position, the top dismantling operation can be performed safely.

  Another tower demolition apparatus according to the present invention is a tower demolition apparatus used in the above-described demolition method, and is installed between a main body part and a top part and climbs to move the top part upward relative to the main body part. And a crane member that has a hanging part that is movable in the horizontal direction at the lower part of the top part, and that moves the iron material of the disassembled main body part to the hanging part and moves it downward.

  Another dismantling apparatus for a steel tower according to the present invention includes a climbing apparatus interposed between a main body part and a top part, and a crane member that moves the dismantled iron material downward, and uses the climbing apparatus and the crane member. It is possible to proceed with the dismantling work. Therefore, a large jack device or the like can be eliminated. In this dismantling apparatus, the dismantling operation can proceed by simply proceeding with dismantling from the upper end of the main body and moving the iron material downward by the crane member. Therefore, the dismantling operation can be performed easily and safely.

  According to the present invention, the work of disassembling the top portion can be performed safely, and large-scale equipment can be made unnecessary.

(A) is a side view showing an example of a steel tower to which the steel tower dismantling method and the dismantling apparatus according to the first embodiment are applied. (B) is the BB sectional drawing of (a). (C) is CC sectional view taken on the line of (a). It is a side view explaining the dismantling method of the steel tower concerning 1st Embodiment. It is a side view which shows the dismantling apparatus of the steel tower which concerns on 1st Embodiment. It is a side view explaining the dismantling method of the steel tower concerning 2nd Embodiment. It is a side view which shows the dismantling apparatus of the steel tower which concerns on 2nd Embodiment. It is a side view explaining the dismantling method of the steel tower concerning 3rd Embodiment. It is a side view explaining the dismantling method of the steel tower which concerns on 4th Embodiment. It is a side view explaining the dismantling method of the steel tower concerning 5th Embodiment.

  Hereinafter, preferred embodiments of a tower demolition method and a tower demolition apparatus according to the present invention will be described in detail with reference to the drawings.

(First embodiment)
As shown in FIG. 1A, a tower 1 according to this embodiment is a radio tower installed on a rooftop S of a building, for example, and an antenna 3 is provided on the top 2 of the tower 1. The top portion 2 includes, for example, a top frame 2a that supports the antenna 3, four column portions 2b that extend downward from the top frame 2a, and a top frame 2c that connects each column portion 2b below the top frame 2a. ing.

  The steel tower 1 includes a main body 4 installed on the rooftop S and a top 2 located at the upper end of the main body 4. The main body 4 includes a lower housing 5 installed on the roof S and an upper housing 6 located on the upper portion of the lower housing 5. As shown in FIGS. 1B and 1C, for example, the lower casing 5 has an octagonal cross section, and the upper casing 6 has a quadrangular cross section. A rectangular hole 5a is formed in the central portion of the cross section of the lower housing 5, and a similar hole 6a is also formed in the central portion of the cross section of the upper housing 6, and these holes 5a. , 6a communicate with each other vertically. A top 2 is provided at the upper end of the upper housing 6.

  Next, the dismantling apparatus 10 which disassembles the steel tower 1 is demonstrated, referring FIG.2 and FIG.3. In FIG. 2, a part of the illustration is simplified for convenience. The dismantling apparatus 10 includes a mast (support member) 11 that is a column that is sequentially added to the hole 5a of the lower housing 5 and the hole 6a of the upper housing 6, and a wall crane (crane member) 12 that is attached to the upper end of the mast 11. Is provided.

  The mast 11 located at the uppermost part pushes up and supports the top frame 2 c of the top part 2 in a state where the top part 2 is cut from the main body part 4. An anti-falling member 13 is provided between the mast 11 and the main body 4, and the anti-falling member 13 holds the mast 11 so as not to fall down in the holes 5 a and 6 a. A wall crane 12 is attached to a portion between the top 2 and the main body 4 of the mast 11 located at the top.

  The wall crane 12 is detachably attached to the mast 11 and includes, for example, a beam 12a extending in the horizontal direction, a vertical member 12b, and an oblique member 12c. A suspended portion 14 is supported on the beam 12a so as to be movable along the beam 12a. The hanging part 14 includes a wire rope 14a that can extend downward to the roof S, and the iron material F of the main body part 4 disassembled at the lower end of the wire rope 14a is suspended.

  Next, a method for dismantling the steel tower 1 using the dismantling apparatus 10 will be described. First, as shown in FIG. 2A, the mast 11 is inserted into the hole 5a of the lower housing 5, and the mast 11 is added and pushed up so that a plurality of masts 11 are stacked in the hole 5a. When the stacked mast 11 reaches the hole 6a of the upper housing 6 and the uppermost mast 11 reaches the top frame 2c of the top 2, the top 2 and the main body 4 (upper housing 6) are separated ( A step of separating the top portion and the main body portion).

  As shown in FIG. 2B, after the separation between the top portion 2 and the main body portion 4 is finished, the mast 11 is continuously added, and the top frame 2 c is pushed upward by the uppermost mast 11. At this time, since the top 2 is pushed up with respect to the main body 4, a gap A is formed between the main body 4 and the top 2. In this way, the separated top 2 is supported above the main body 4 by the uppermost mast 11 (step of supporting the top).

  Next, as shown in FIG. 2C, a wall crane 12 is installed on the uppermost mast 11. Specifically, the vertical member 12b is attached to the mast 11 with the vertical member 12b of the wall crane 12 along the column member of the mast 11, and the beam 12a of the wall crane 12 extends horizontally in the gap A to The wall crane 12 is installed so as to protrude outward.

  Then, the upper housing 6 is disassembled from the upper end of the main body 4 (upper housing 6) downward. That is, the upper housing 6 is cut and disassembled, and the dismantled iron material F of the upper housing 6 is sequentially suspended from the suspension portion 14 and lowered onto the roof S. As the upper housing 6 is disassembled, the mast 11 is also lowered sequentially from the top, and the top 2 is moved downward (step of moving the top downward).

  Then, as shown in FIG. 2 (d), after the disassembly of the upper housing 6 is completed, the lower housing 5 is disassembled downward from the upper end of the lower housing 5. At this time, the lower casing 5 is cut and disassembled in the same manner as described above, and the iron material F of the disassembled lower casing 5 is sequentially suspended from the suspension section 14 and moved down, and the top section 2 is moved downward. After moving the top 2 downward while disassembling the lower housing 5 in this way, the antenna 3 and the top 2 are disassembled, and the top 2 and the antenna 3 are removed by a crane installed on the rooftop S (disassembling the top). Process).

  As described above, in the dismantling method of the steel tower 1 according to the present embodiment, the top 2 and the main body 4 are separated, and the main body 4 is sequentially disassembled downward while the separated top 2 is supported by the mast 11. To go. And the main body part 4 is disassembled sequentially from the upper end of the main body part 4 downward, and after moving the top part 2 downward, the top part 2 is disassembled. Thus, since the top part 2 is disassembled at a lower position, the work of disassembling the top part 2 can be performed safely.

  Moreover, in the dismantling method of this embodiment, since only the dismantling apparatus 10 and the top part 2 are moved up and down, facilities such as a large jack apparatus can be dispensed with.

  Moreover, in the dismantling apparatus 10 which concerns on this embodiment, the wall crane which moves the mast 11 supported in the state which moved the top part 2 with respect to the main-body part 4 upward, and the iron material F of the disassembled main-body part 4 below. 12, and the dismantling work can be advanced by using the mast 11 and the wall crane 12. Therefore, a large facility can be eliminated. Moreover, in the dismantling apparatus 10, since dismantling work can be advanced only by dismantling the main-body part 4 sequentially from the top and moving the iron material F below by the wall crane 12, dismantling work can be performed easily.

  Furthermore, in the demolition apparatus 10, the wall crane 12 is arrange | positioned so that it may extend outside the steel tower 1 from the mast 11 which passes the inside of the hole parts 5a and 6a. Therefore, compared with the case where a crane is arrange | positioned on the outer side of the steel tower 1 in the rooftop S, the working radius of a crane can be made small.

(Second Embodiment)
Next, the disassembling apparatus 20 according to the second embodiment will be described with reference to FIGS. 4 and 5. In FIG. 4, part of the illustration is simplified for convenience. In addition, the description overlapping with the above description is omitted below. The dismantling device 20 includes a climbing device 21 installed between the upper end 4a of the main body portion 4 and the lower end 2d of the top portion 2, and a suspension portion 24 that can move in the horizontal direction below the top portion 2 (top portion frame 2c). And a shuttle crane (crane member) 22.

  The climbing device 21 includes, for example, a main body portion 21a connected between the upper end 4a of the main body portion 4 and the lower end 2d of the top portion 2, and a climbing cylinder 21b that can be vertically expanded and contracted along the main body portion 21a. . The top part 2 is pushed up with respect to the main body part 4 by extension of the climbing cylinder 21b, and the top part 2 is lowered with respect to the main body part 4 by reduction of the climbing cylinder 21b.

  The shuttle crane 22 includes, for example, a circular rail 22a and a linear girder 22b that turns on a horizontal plane along the circular rail 22a. The girder 22b can expand and contract in the radial direction of the circular rail 22a, and can move inside and outside the top portion 2. A hanging part 24 is supported on the girder 22b so as to be movable along the girder 22b. The hanging part 24 includes a wire rope 24a similar to the hanging part 14, and the iron material F disassembled at the lower end of the wire rope 24a is suspended.

  Next, a method for dismantling the steel tower 1 using the dismantling apparatus 20 will be described with reference to FIG. First, the top 2 and the main body 4 (upper housing 6) are separated (step of separating the top and the main body). And the climbing apparatus 21 is installed between the lower end 2d of the top part 2 and the upper end 4a of the main-body part 4, and the top part 2 cut | disconnected by the climbing apparatus 21 is supported (process which supports a top part). Thus, in a state where the top portion 2 is supported above the main body portion 4, the shuttle crane 22 is installed below the top frame 2c. Specifically, the shuttle crane 22 is installed so that the circular rail 22a of the shuttle crane 22 runs along the horizontal plane and the girder 22b can move inside and outside the top portion 2.

  Then, as in the first embodiment, the upper housing 6 and the lower housing 5 are disassembled downward from the upper end of the main body 4 (upper housing 6), and the top 2 is moved downward (the top is moved downward). Step), and then the top 2 is disassembled (step of disassembling the top).

  As described above, in the disassembling method according to the second embodiment, the top portion 2 and the main body portion 4 are separated, and the main body portion 4 is disassembled downward while the separated top portion 2 is supported by the climbing device 21. Therefore, the same effect as the first embodiment can be obtained. The dismantling device 20 includes a climbing device 21 interposed between the upper end 4a of the main body 4 and the lower end 2d of the top portion 2, and a shuttle crane 22 that moves the dismantled iron material F downward. And the shuttle crane 22 can be used to proceed with the dismantling work. Therefore, a large-scale device can be dispensed with.

  Furthermore, in the dismantling apparatus 20, dismantling work can be advanced by simply proceeding with dismantling from the upper end 4 a of the main body 4 and moving the iron material F downward by the shuttle crane 22. Therefore, the dismantling operation can be performed easily. Further, in the disassembling apparatus 20, the disassembly of the main body 4 is advanced downward, the top 2 is moved downward, and the top 2 is disassembled in a state where the top 2 is moved downward. Therefore, since the disassembly work of the top part 2 is performed at a lower position, the disassembly work of the top part 2 can be performed safely.

(Third embodiment)
Next, the disassembling apparatus 30 and the disassembling method according to the third embodiment will be described with reference to FIG. The dismantling apparatus 30 according to the third embodiment is different from the first embodiment in that a floor climbing method is adopted. That is, the mast 31 of the dismantling apparatus 30 is a support member that is gradually pulled up while being supported by the steel frame 5b that is a horizontal member of the lower casing 5.

  Regarding the method of dismantling the steel tower 1 using the dismantling device 30, first, the mast 31 is inserted into the hole 5a of the lower housing 5, and the mast 31 is supported by the steel frame 5b within the hole 5a and pulled up several steps. Go. When the raised mast 31 reaches the hole 6a of the upper housing 6 and the upper end of the mast 31 reaches the top frame 2c of the top 2, the top 2 and the main body 4 are separated (the top and the main body are separated). Separating step). As shown in FIG. 6B, after the separation between the top portion 2 and the main body portion 4 is finished, the mast 31 is further lifted and the top frame 2 c is pushed upward by the mast 31. Thus, like the first embodiment, the separated top 2 is supported above the main body 4 by the mast 31 (step of supporting the top).

  Thereafter, as in the first embodiment, as shown in FIG. 6C, the wall crane 12 is installed at the upper end of the mast 31, and the dismantling of the upper casing 6 is advanced from the upper end of the main body portion 4 downward. . Along with this, the mast 31 is lowered, and the top 2 is also moved downward (step of moving the top downward). Then, as shown in FIG. 6D, after the disassembly of the lower housing 5 is advanced and the top 2 is moved downward, the top 2 and the antenna 3 are disassembled (step of disassembling the top). As described above, in the disassembling method according to the third embodiment, the top 2 and the main body 4 are separated, and the main body 4 is disassembled downward while the separated top 2 is supported by the mast 31. The same effect as the first embodiment can be obtained.

(Fourth embodiment)
Next, the disassembling apparatus 40 and the disassembling method according to the fourth embodiment will be described with reference to FIG. The dismantling apparatus 40 according to the fourth embodiment is different from the third embodiment in that a plurality of divided (for example, four) masts 41 are used instead of the mast 31 of the third embodiment.

  The mast 41 of the fourth embodiment is thinner than the mast 31. For example, the thickness when a plurality of masts 41 are connected is the same as the thickness of the mast 31. In this way, by narrowing the mast 41, the mast 41 is pulled up through the holes 5a and 6a even if there are steps or braces in the hole 5a of the lower casing 5 or the hole 6a of the upper casing 6. It becomes possible.

  Regarding the method of dismantling the steel tower 1 using the dismantling device 40, first, the first mast 41 is inserted into the hole 5a of the lower housing 5, and the mast 41 is supported by the steel frame 5b in the hole 5a while being several stages. Pull it up one by one. Next, as shown in FIG. 7 (a), like the first mast 41, the second mast 41 is inserted and pulled up, and all the mast 41 reaches the hole 6a of the upper casing 6, When the upper end of 41 reaches the top frame 2c of the top 2, the plurality of masts 41 are connected.

  After that, as shown in FIG. 7B, as in the third embodiment, the top 2 and the main body 4 are separated from each other, and the top 2 is lifted and supported by the plurality of masts 41 pulled up. Then, as shown in FIGS. 7 (c) and 7 (d), the wall crane 12 is installed, the upper housing 6 is disassembled from above, and the top 2 is moved downward. 3 dismantling. As described above, in the disassembling method according to the fourth embodiment, the top portion 2 and the main body portion 4 are separated, and the main body portion 4 is disassembled downward while the separated top portions 2 are supported by the plurality of masts 41. Therefore, the same effect as the third embodiment can be obtained.

(Fifth embodiment)
Next, a disassembling apparatus 50 and a disassembling method according to the fifth embodiment will be described with reference to FIG. The dismantling apparatus 50 according to the fifth embodiment is different from the first embodiment in that a plurality of divided mast groups 51 are used. That is, the plurality of mast groups 51 correspond to the mast 11 of the first embodiment.

  The mast group 51 is configured by a plurality of masts 51a being added and stacked. The mast 51a is thinner than the mast 11 like the mast 41 of the fourth embodiment. Therefore, even if a staircase or a brace exists in the hole 5a of the lower casing 5 or the hole 6a of the upper casing 6, the mast 51a can be added and stacked through the holes 5a and 6a.

  Regarding the method of dismantling the steel tower 1 using the dismantling apparatus 50, first, the mast 51a is inserted into the hole 5a of the lower housing 5, and the mast 51a is added so that a plurality of masts 51a are stacked in the hole 5a. Go. Then, as shown in FIG. 8A, the uppermost mast 51 a reaches the top frame 2 c of the top 2 to form a first mast group 51.

  Next, as shown in FIG. 8B, like the first mast group 51, the second mast group 51 is formed, and all the mast groups 51 reach the hole 6a of the upper housing 6, and the mast group When the upper end of 51 reaches the top frame 2 c of the top 2, the plurality of mast groups 51 are connected. Then, the top portion 2 and the main body portion 4 are separated, and the top portion 2 is supported by the plurality of mast groups 51.

  After that, as shown in FIG. 8C and FIG. 8D, as in the fourth embodiment, the wall crane 12 is installed, the main body 4 is disassembled from above, the top 2 is moved downward, And the top 2 is disassembled. As described above, in the disassembling method according to the fifth embodiment, the top portion 2 and the main body portion 4 are separated, and the main body portion 4 is disassembled downward while the separated top portion 2 is supported by the plurality of mast groups 51. Go. Therefore, the same effect as the third embodiment and the fourth embodiment can be obtained.

  The present invention is not limited to the above-described embodiments, and various modifications can be made without departing from the spirit and scope of the present invention.

  For example, in the above-described embodiment, an example in which the wall crane 12 or the shuttle crane 22 is used as the dismantling device has been described, but a crane member other than these cranes may be used. Further, the climbing device is not limited to the above-described climbing device 21, and various climbing devices can be used.

  Moreover, in the said embodiment, the steel tower 1 which is a radio tower installed in the rooftop S was demonstrated. However, the form of the steel tower is not limited to the above embodiment, and the shape, size, structure, or installation position may be different from that of the steel tower 1. That is, the dismantling method and dismantling apparatus according to the present invention can be applied to various steel towers other than the steel tower 1.

DESCRIPTION OF SYMBOLS 1 ... Steel tower, 2 ... Top part, 2a, 2c ... Top frame, 2b ... Column part, 3 ... Antenna, 4 ... Main body part, 4a ... Upper end, 5 ... Lower casing, 5a, 6a ... Hole part, 5b ... Steel frame, 6 ... Upper housing 10, 20, 30, 40, 50 ... Dismantling device, 11, 31, 41, 51a ... Mast (support member), 12 ... Wall crane (crane member), 13 ... Anti-falling member, 14, 24 ... Hanging part, 21 ... climbing device, 22 ... shuttle crane (crane member), 51 ... mast group, F ... iron material, S ... rooftop.

Claims (3)

In a dismantling method of a steel tower comprising a main body part and a top part located at the upper end of the main body part,
Separating the top portion and the main body portion;
Supporting the separated top portion above the body portion;
Disassembling the main body portion downward from the upper end of the main body portion and moving the top portion downward;
Dismantling the top moved downward; and
A method for dismantling a steel tower. A tower demolition apparatus used in the demolition method according to claim 1,
The top part separated from the main body part is moved upward with respect to the main body part, and a support member for supporting the moved top part,
It has a suspension part that is movable in the horizontal direction between the top part supported by the support member and the body part, and the disassembled iron material of the body part is suspended from the suspension part and moved downward. A crane member to be
A steel tower dismantling device. A tower demolition apparatus used in the demolition method according to claim 1,
A climbing device installed between the main body and the top and moving the top upward with respect to the main body;
A crane member that has a suspension part that is movable in a horizontal direction at a lower part of the top part, and that moves the iron material of the disassembled main body part to the suspension part and moves downward;
A steel tower dismantling device.