JP2005344455A - Disassembling method of towered structure and shock absorbing device used in the disassembling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a demolishing method of a towered structure capable of reducing occurrence of vibration and noise due to collision of dropped broken pieces onto the ground in the demolishing method in which a towered structure like a chimney or the like is broken in turns from the upper side and it is dismantled while the broken pieces are dropped. <P>SOLUTION: In the lower end of the inside of a chimney 31 to be demolished, an air membrane structure 11 in which compressed air is filled is disposed, by receiving the broken pieces 33 demolished from the upper side and from above by the air membrane structural body 11, shock of the broken pieces 33 is absorbed to reduce occurrence of vibration and noise. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a method for dismantling a tower structure such as a chimney.

  Conventionally, as a method of dismantling a tower-like structure such as a chimney, a method is known in which the tower-like structure is sequentially crushed from the upper part and dismantled while dropping crushed pieces.

That is, a work scaffold is assembled around the tower structure, and a worker uses a hand breaker or the like to suspend the work scaffold from the top, or the work scaffold and hydraulic demolition machine are lifted with a crane, and these are built into the tower structure itself. It is installed on the top of the peripheral wall and suspended from the top using a hydraulic dismantling machine, or a mast of approximately the same height as a tower-like structure is installed, and the hydraulic dismantling machine is mounted on a mast that can be raised and lowered on the mast Is mounted and then suspended from the top using a hydraulic dismantling machine (see, for example, Patent Document 1).
JP 2002-349080 A

  However, in the dismantling method in which the tower-like structure is sequentially crushed from the upper part and disassembled while dropping the crushed pieces, the dropped crushed pieces collide with the ground and generate vibration and noise. Especially when the dismantling work is performed in the vicinity of a residential area, the vibration and noise often become a problem, but conventionally, no appropriate measures have been taken.

  The present invention has been made in view of the above circumstances, and in a dismantling method in which a tower-like structure is sequentially crushed from its upper part and disassembled while dropping crushed pieces, the fallen crushed pieces are caused to collide with the ground. An object of the present invention is to provide a method for dismantling a tower-like structure that can reduce generation of vibration and noise. Furthermore, it aims at providing the impact mitigation apparatus for using in the dismantling method.

  In order to solve the above problems, the present invention has the following features.

  [1] In a dismantling method in which a tower-like structure is sequentially crushed from the upper part and disassembled while dropping the crushed pieces, an impact mitigation device including an air film structure filled with compressed air is disposed on the ground, A method for disassembling a tower-like structure, wherein the fragmented pieces are received by the air film structure.

  [2] The tower-like structure according to [1], wherein the crushed pieces are dropped into the tower-like structure, and the air film structure is disposed inside the tower-like structure. Dismantling method.

  [3] An impact mitigation device used in the method for dismantling a tower-like structure according to [1] or [2], wherein the air film structure expands when compressed air is sent into the interior, and the air film structure An impact mitigation device comprising: an air compressor for sending compressed air into a body; and an on-off valve for adjusting the amount of compressed air inside the air film structure by opening and closing the air compressor.

  [4] The impact mitigating device according to [3], wherein aramid fibers are attached to the upper surface of the air membrane structure.

  [5] The pressure relief valve for releasing the compressed air inside the air film structure to the outside when the pressure inside the air film structure becomes a predetermined pressure or more. The impact mitigation device according to [3] or [4].

  In the present invention, when the tower-like structure is sequentially crushed from the upper part and disassembled while dropping the crushed pieces, the falling crushed pieces are received by the air film structure. The impact of the crushed pieces can be absorbed and the generation of vibration and noise due to the dropped crushed pieces can be reduced.

  One embodiment of the present invention is described below.

  First, FIG. 1 shows an impact mitigation device used in a tower-like structure dismantling method according to this embodiment. In the figure, reference numeral 10 denotes an impact mitigation device, which is an air film structure 11, an air compressor 14, a connecting pipe 15 that connects the air film structure 11 and the air compressor 14, and a tip branched from the connecting pipe 15. Is provided with a branch pipe 16 that is open to the atmosphere, and an on-off valve 17 provided in the branch pipe 16.

  The air membrane structure 11 is made of a fiber membrane, and has a structure in which compressed air is fed into the inside thereof to expand, and here, the air membrane structure 11 expands into a cylindrical shape. Yes.

  And the aramid fiber is affixed on the upper surface 11a of the air film | membrane structure 11, and it prevents that the sharp protrusion (for example, reinforcing bar) in the disassembled crushed piece pierces the air film | membrane structure 11. . Incidentally, aramid fiber is a very tough fiber used in bulletproof vests and the like.

  Further, a pressure relief valve 13 is provided on the side surface 11b of the air membrane structure 11, and when the inside of the air membrane structure 11 rises above a predetermined pressure, the pressure relief valve 13 and the air membrane structure 11 The internal air is released to prevent the air film structure 11 from being damaged.

  Next, the work procedure in the method for dismantling the tower-like structure according to this embodiment will be described with reference to FIG.

  (Step 1) First, before the crushing of the chimney 31 is started, the air membrane structure 11 is contracted from the opening 32 provided at the bottom of the chimney 31 in order to carry out the crushed pieces. After carrying in, compressed air is sent from the air compressor 14 and the air film structure 11 is expanded (FIG. 2A).

  (Step 2) Using a hydraulic dismantling machine (not shown) or the like, crushing is performed sequentially from the upper part of the chimney 31, and dismantling is performed while dropping the fragments 33 into the chimney 31. The crushed pieces 33 that fall into the chimney 31 are received by the air film structure 11 (FIG. 2B). Thereby, generation | occurrence | production of the vibration and noise by the crushing piece 33 which fell is reduced. In addition, when the pressure inside the air film structure 11 rapidly increases by receiving the crushed pieces 33, the air inside the air film structure 11 is released from the pressure relief valve 13, and the air film structure 11. Damage is prevented. Further, even when a sharp protrusion such as a reinforcing bar is present in the crushed piece, since the aramid fiber is attached to the upper surface 11a of the air membrane structure 11, the sharp protrusion sticks into the air film structure 11. It is prevented.

  (Step 3) When a predetermined amount of crushed pieces 33 are accumulated, the on-off valve 17 is opened to contract the air membrane structure 11, and the crushed pieces 33 are carried out from the opening 32 (FIG. 2 (c)).

  (Step 4) When the crushed piece 33 is carried out from the opening 32, the compressed air is sent again from the air compressor 14 to expand the air film structure 11 (FIG. 2A).

  Thereafter, (Step 2) to (Step 4) are repeated.

  (Step 5) Then, when dismantling to a height at which generation of vibration and noise due to the fall of the shredded pieces 33 does not become a problem, the air film structure 11 is shrunk and carried out of the chimney 31.

  (Step 6) Thereafter, the remaining height portion is dismantled and the dismantling work is completed.

  As described above, in this embodiment, when the chimney 31 is sequentially crushed from the upper part and disassembled while dropping the crushed pieces 33, the dropped crushed pieces 33 are received by the air membrane structure 11. Therefore, it is possible to absorb the impact of the crushed pieces 33 from which the air film structure 11 has been dropped, and reduce the generation of vibration and noise due to the dropped crushed pieces 33.

  In this embodiment, the cylindrical air membrane structure 11 is used alone. However, as shown in FIG. 3, the air membrane structure 21 having a horizontal section that is part of a donut shape is also used. Also good. That is, as shown in FIG. 4, the air membrane structure 21 having a horizontal section that is part of a donut shape is combined with the outer periphery of the cylindrical air membrane structure 11 and installed inside the chimney 31. It can correspond to chimneys of various inner diameters. In FIG. 3, reference numeral 23 denotes a pressure relief valve.

  Further, if the air membrane structure is formed in a prismatic shape, it can also cope with a chimney having a rectangular cross section.

It is explanatory drawing of the impact relaxation apparatus used in one Embodiment of this invention. It is explanatory drawing of the dismantling method in one Embodiment of this invention. It is explanatory drawing of another air film structure. It is explanatory drawing of another impact relaxation apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Impact mitigation device 11 Air film structure 11a Upper surface of air film structure 11b Side surface of air film structure 13 Pressure relief valve 14 Air compressor 15 Connecting pipe 16 Branch pipe 17 On-off valve 21 Air film structure 23 Pressure relief valve 31 Chimney 32 Opening 33 Fragment

Claims (5)

  In a dismantling method in which a tower-like structure is sequentially crushed from the upper part and disassembled while dropping the crushed pieces, an impact relaxation device including an air film structure filled with compressed air is disposed on the ground, and the crushed pieces Is received by the air film structure.   2. The method for disassembling a tower-like structure according to claim 1, wherein the fragmented pieces are dropped into the tower-like structure, and the air film structure is disposed inside the tower-like structure.   It is an impact mitigation apparatus used in the dismantling method of the tower-shaped structure of Claim 1 or 2, Comprising: The air film structure which sends compressed air inside and expands, and sends compressed air to this air film structure And an on-off valve for adjusting the amount of compressed air inside the air membrane structure by opening and closing the air compressor.   4. The impact mitigation device according to claim 3, wherein aramid fibers are attached to the upper surface of the air membrane structure.   A pressure relief valve is provided for releasing compressed air inside the air film structure to the outside when the pressure inside the air film structure exceeds a predetermined pressure. 4. The impact mitigation device according to 4.

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