JP3881343B2

JP3881343B2 - Method and apparatus for disassembling cylindrical structure

Info

Publication number: JP3881343B2
Application number: JP2004034996A
Authority: JP
Inventors: 登西垣
Original assignee: 宮地建設工業株式会社
Priority date: 2004-02-12
Filing date: 2004-02-12
Publication date: 2007-02-14
Anticipated expiration: 2024-02-12
Also published as: JP2005226295A

Description

本発明は、老朽化した鉄筋コンクリート製煙突や鋼製煙突などの筒状構造物、特に鉄塔などに周囲を支持されていない自立型の筒状構造物をその基端部から順次解体する筒状構造物の解体方法およびその解体装置に関する。 The present invention is a cylindrical structure in which a cylindrical structure such as an aged reinforced concrete chimney or steel chimney, in particular, a self-supporting cylindrical structure that is not supported by a steel tower or the like is sequentially disassembled from its base end. The present invention relates to an object dismantling method and an apparatus for disassembling the object.

老朽化した煙突などの筒状構造物を解体するには、例えば、大型クローラクレーンのブームを筒状構造物の頂部へ延ばして筒状構造物を頂部から解体する方法や、筒状構造物を登り降りする解体装置によって筒状構造物を頂部から解体する方法が採られていた。
これらの方法では筒状構造物を頂部から解体するため、周辺へ解体片や粉塵が飛散するおそれがあり、特に焼却施設のダイオキシンに汚染された煙突においては近隣住民へ悪影響を及ぼすおそれがある。 In order to dismantle a cylindrical structure such as an old chimney, for example, a method of extending a boom of a large crawler crane to the top of the tubular structure and disassembling the tubular structure from the top, or a tubular structure A method of disassembling the cylindrical structure from the top with a dismantling device that climbs up and down has been adopted.
In these methods, the cylindrical structure is dismantled from the top, so there is a risk that dismantling pieces and dust will be scattered to the surrounding area, and in particular, in the chimney contaminated with dioxins in the incineration facility, there is a risk of adversely affecting neighboring residents.

そこで、筒状構造物である塔体の周囲に作業台を配置し、この作業台に塔体の側面を吊下げて固定した後、その固定部より下方の塔体を切断して取り除き、その取り除いた分だけ塔体を降下させて再び作業台に固定し、上記切断作業を繰り返すようにした塔体の解体方法が考えられている（例えば、特許文献１参照）。これにより、高所での解体作業がなくなり、解体物等が高所から飛来落下することがなくなるというものである。
特開平７−１０２７９３号公報 Therefore, after placing a work table around the tower body which is a cylindrical structure and fixing the side surface of the tower body to this work table, the tower body below the fixing part is cut and removed, There has been considered a method of disassembling the tower body in which the tower body is lowered and fixed to the work table again, and the above cutting operation is repeated (see, for example, Patent Document 1). As a result, the dismantling work at the high place is eliminated, and the dismantled object or the like is prevented from flying and falling from the high place.
JP-A-7-102793

しかしながら、筒状構造物は細長い形状で鉛直に立設しており、その基端部から順次解体する場合、筒状構造物をその下端部付近で保持すると、解体時に風、地震等によって発生する転倒モーメントにより筒状構造物が不安定になり易く、その転倒モーメントを支持するために上記作業台等の仮設構造物、仮設設備を大掛かりなものとする必要がある。 However, the cylindrical structure is vertically elongated and has a vertical shape. When dismantling from its base end, if the cylindrical structure is held near its lower end, it will be generated by wind, earthquake, etc. The cylindrical structure is likely to become unstable due to the overturning moment, and it is necessary to make the temporary structure such as the work table and the temporary equipment large in order to support the overturning moment.

本発明の課題は、筒状構造物を保持しながらその基端部から順次解体する際に、筒状構造物を安定して保持し、解体のための仮設構造物、仮設設備を小規模なものとすることである。 An object of the present invention is to stably hold a cylindrical structure when sequentially disassembling the tubular structure while holding the tubular structure, and to provide a temporary structure and temporary equipment for dismantling on a small scale. Is to be.

以上の課題を解決するため、本発明は、例えば図１に示すように、筒状構造物（鉄筋コンクリート製煙突１、以下「煙突１」という。）を保持しながらその基端部から順次解体する方法であって、筒状構造物（煙突１）の重心Ｇよりも上方の位置でこの筒状構造物（煙突１）の水平移動を拘束することを特徴とする。 In order to solve the above problems, the present invention , for example, as shown in FIG. 1, sequentially disassembles from a base end portion of a tubular structure (reinforced concrete chimney 1, hereinafter referred to as “chimney 1”) while holding it. It is a method, Comprising: The horizontal movement of this cylindrical structure (chimney 1) is restrained in the position above the gravity center G of a cylindrical structure (chimney 1), It is characterized by the above-mentioned.

このように、解体しようとする筒状構造物（煙突１）を保持しながら、その重心Ｇよりも上方の位置で水平移動を拘束することにより、筒状構造物（煙突１）の転倒モーメントを有効に押さえ、安定して筒状構造物（煙突１）を保持することができる。また、その転倒モーメントを支持するための仮設構造物、仮設設備を小規模なものとすることができる。 In this way, by holding the cylindrical structure (chimney 1) to be dismantled and restraining the horizontal movement at a position above the center of gravity G, the overturning moment of the cylindrical structure (chimney 1) is reduced. It can hold down effectively and can hold a cylindrical structure (chimney 1) stably. Further, the temporary structure and the temporary equipment for supporting the overturning moment can be made small.

さらに、本発明は、前記筒状構造物の解体方法において、例えば図６、７に示すように、筒状構造物（煙突１）の地上近傍の所定高さに貫通口１６を形成し、この貫通口１６に筒身支持梁５を挿入し、この筒身支持梁５で筒状構造物（煙突１）の荷重を支持することを特徴とする。 Furthermore, the present invention provides a method for disassembling the cylindrical structure , wherein , as shown in FIGS. 6 and 7, for example, the through-hole 16 is formed at a predetermined height near the ground of the cylindrical structure (chimney 1). The cylindrical support beam 5 is inserted into the through-hole 16, and the cylindrical support beam 5 supports the load of the cylindrical structure (chimney 1).

このように、筒状構造物（煙突１）の地上近傍の所定高さに貫通口１６を形成し、この貫通口１６に筒身支持梁５を挿入し、この筒身支持梁５により筒状構造物（煙突１）を支持することにより、筒状構造物（煙突１）を確実に支持し、安定して筒状構造物（煙突１）を保持することができる。 In this way, the through hole 16 is formed at a predetermined height near the ground surface of the cylindrical structure (chimney 1), and the cylindrical support beam 5 is inserted into the through hole 16, and the cylindrical support beam 5 forms a cylindrical shape. By supporting the structure (chimney 1), the cylindrical structure (chimney 1) can be reliably supported, and the cylindrical structure (chimney 1) can be stably held.

また、本発明は、例えば図１に示すように、筒状構造物（煙突１）を保持しながらその基端部から順次解体する装置であって、筒状構造物（煙突１）の重心よりも上方に位置してこの筒状構造物（煙突１）の水平移動を拘束する筒身拘束手段３を備えることを特徴とする。 Further, the present invention is an apparatus for sequentially dismantling from a base end portion of a cylindrical structure (chimney 1) while holding the cylindrical structure (chimney 1) as shown in FIG. Is also provided with a cylinder restraining means 3 which is located above and restrains the horizontal movement of the cylindrical structure (chimney 1).

このように、解体しようとする筒状構造物（煙突１）を保持しながら、筒身拘束手段３が、筒状構造物（煙突１）の重心よりも上方の位置で筒状構造物（煙突１）の水平移動を拘束するため、筒状構造物（煙突１）の転倒モーメントを有効に押さえ、解体装置２が安定して筒状構造物（煙突１）を保持することができる。また、その転倒モーメントを支持するための解体装置２等の仮設構造物、仮設設備を小規模なものとすることができる。 In this way, while holding the cylindrical structure (chimney 1) to be disassembled, the cylindrical body restraining means 3 is located at a position above the center of gravity of the cylindrical structure (chimney 1). Since the horizontal movement of 1) is constrained, the overturning moment of the cylindrical structure (chimney 1) can be effectively suppressed, and the dismantling device 2 can stably hold the cylindrical structure (chimney 1). Further, the temporary structure such as the dismantling device 2 and the temporary equipment for supporting the overturning moment can be reduced in size.

さらに、本発明は、前記筒状構造物（煙突１）の解体装置２において、例えば図６、７に示すように、筒状構造物（煙突１）の地上近傍の所定高さに形成される貫通口１６に挿入される筒身支持梁５で筒状構造物（煙突１）の荷重を支持する筒身支持手段４を備えることを特徴とする。 Further, according to the present invention, in the dismantling apparatus 2 for the cylindrical structure (chimney 1), as shown in FIGS. 6 and 7, for example, the cylindrical structure (chimney 1) is formed at a predetermined height near the ground. A cylindrical body support means 4 for supporting the load of the cylindrical structure (chimney 1) with the cylindrical body support beam 5 inserted into the through-hole 16 is provided.

このように、筒身支持手段４が、筒状構造物（煙突１）の地上近傍の所定高さに形成される貫通口１６に挿入される筒身支持梁５で筒状構造物（煙突１）の荷重を支持するため、筒状構造物（煙突１）を確実に支持し、解体装置２が安定して筒状構造物（煙突１）を保持することができる。 Thus, the cylindrical structure (chimney 1) is formed by the cylindrical support beam 5 inserted into the through-hole 16 formed at a predetermined height near the ground surface of the cylindrical structure (chimney 1). ) To support the cylindrical structure (chimney 1) with certainty, and the dismantling device 2 can stably hold the cylindrical structure (chimney 1).

本発明の具体的な筒状構造物の解体装置としては、例えば図１に示すように、筒状構造物（煙突１）を保持しながらその基端部から順次解体する装置であって、筒状構造物（煙突１）の側周にほぼ等間隔に立設する複数の支柱１０に支持される架台９と、前記架台９に配置される複数のリフトダウン装置８と、前記リフトダウン装置８に保持され、筒状構造物（煙突１）の重心Ｇよりも上方に位置してこの筒状構造物（煙突１）の水平移動を拘束する筒身拘束手段３と、前記筒身拘束手段３から巻上装置６を介して吊り下げられ、筒状構造物（煙突１）の地上近傍の所定高さに形成される貫通口１６（図７参照。）に挿入される筒身支持梁５で筒状構造物（煙突１）の荷重を支持する筒身支持手段４と、を備える。 As a specific cylindrical structure disassembling apparatus of the present invention, for example, as shown in FIG. 1, an apparatus for sequentially disassembling a cylindrical structure (chimney 1) from its base end while holding the cylindrical structure. A frame 9 supported by a plurality of support columns 10 erected at substantially equal intervals on the side periphery of the structure (chimney 1), a plurality of lift-down devices 8 disposed on the frame 9, and the lift-down device 8 And a cylindrical body restraining means 3 which is positioned above the center of gravity G of the cylindrical structure (chimney 1) and restrains the horizontal movement of the cylindrical structure (chimney 1), and the cylindrical body restraining means 3 A cylindrical support beam 5 that is suspended from a hoisting device 6 and inserted into a through-hole 16 (see FIG. 7) formed at a predetermined height near the ground surface of the cylindrical structure (chimney 1). Cylinder support means 4 for supporting the load of the cylindrical structure (chimney 1).

このように、解体しようとする筒状構造物（煙突１）を複数の支柱１０に支持される架台９とこの架台９に配置される複数のリフトダウン装置８で保持しながら、筒身拘束手段３が、筒状構造物（煙突１）の重心Ｇよりも上方の位置で筒状構造物（煙突１）の水平移動を拘束することにより、筒状構造物（煙突１）の転倒モーメントを有効に押さえ、解体装置２が安定して筒状構造物（煙突１）を保持することができる。また、その転倒モーメントを支持するための仮設構造物、仮設設備を小規模なものとすることができる。さらに、筒身拘束手段３から巻上装置６を介して吊り下げられた筒身支持手段４が、筒状構造物（煙突１）の地上近傍の所定高さに形成される貫通口１６に挿入される筒身支持梁５で筒状構造物（煙突１）の荷重を支持することにより、筒状構造物（煙突１）を確実に支持し、解体装置２が安定して筒状構造物（煙突１）を保持することができる。
そして、筒身拘束手段３により筒状構造物（煙突１）を拘束したままの状態で、筒身支持梁５を貫通口１６から抜き取り、再び筒状構造物（煙突１）の地上近傍の所定高さに貫通口１６を形成し、巻上装置６を地上近傍の所定高さまで巻き上げ、貫通口１６に筒身支持梁５を挿入した後、リフトダウン装置８を作動させて筒身拘束手段３のみをその地上近傍の所定高さに相当する高さ分上昇させる。こうして筒身拘束手段３および筒身支持手段４を上方に盛り替えることができる。 In this way, while holding the cylindrical structure (chimney 1) to be disassembled by the gantry 9 supported by the plurality of columns 10 and the plurality of lift-down devices 8 arranged on the gantry 9, the cylinder restraining means 3 restrains the horizontal movement of the cylindrical structure (chimney 1) at a position above the center of gravity G of the cylindrical structure (chimney 1), thereby effectively using the overturning moment of the cylindrical structure (chimney 1). The dismantling device 2 can hold the cylindrical structure (chimney 1) stably. Further, the temporary structure and the temporary equipment for supporting the overturning moment can be made small. Further, the cylinder support means 4 suspended from the cylinder restraint means 3 via the hoisting device 6 is inserted into the through-hole 16 formed at a predetermined height near the ground of the cylindrical structure (chimney 1). By supporting the load of the cylindrical structure (chimney 1) with the cylindrical support beam 5 to be supported, the cylindrical structure (chimney 1) is reliably supported, and the dismantling apparatus 2 is stabilized and the cylindrical structure ( The chimney 1) can be held.
Then, with the tubular structure (chimney 1) being restrained by the tubular body restraining means 3, the tubular support beam 5 is removed from the through-hole 16, and again the predetermined vicinity of the tubular structure (chimney 1) near the ground. The through-hole 16 is formed at a height, the hoisting device 6 is wound up to a predetermined height near the ground, and the tubular support beam 5 is inserted into the through-hole 16, and then the lift-down device 8 is operated to operate the tubular restraining means 3. Is raised by a height corresponding to a predetermined height near the ground. In this way, the barrel restraining means 3 and the barrel support means 4 can be rearranged upward.

本発明の具体的な筒状構造物の解体方法としては、例えば図１に示すように、上記筒状構造物の解体装置を用いて筒状構造物（煙突１）を保持しながらその基端部から順次解体する方法であって、前記筒身拘束手段３で筒状構造物（煙突１）の水平移動を拘束するとともに、前記筒身拘束手段３から巻上装置６を介して吊り下げられた筒身支持手段４で筒状構造物（煙突１）の荷重を支持し、前記筒身支持梁５が挿入された貫通口１６（図７参照）の位置よりも下方の位置で筒状構造物（煙突１）を切断して搬出し、その切断して搬出した分だけ前記リフトダウン装置８により筒状構造物（煙突１）を保持しながら下降させ、前記筒身拘束手段３および筒身支持手段４を上方に盛り替える。 As a specific method of disassembling a cylindrical structure according to the present invention, for example, as shown in FIG. 1, the base end of the tubular structure (chimney 1) is held while the cylindrical structure disassembling apparatus is used. In which the tubular structure (chimney 1) is restrained from horizontal movement by the tubular restraining means 3 and is suspended from the tubular restraining means 3 via a hoisting device 6. The tubular structure supporting means 4 supports the load of the tubular structure (chimney 1), and the tubular structure is positioned below the position of the through-hole 16 (see FIG. 7) into which the tubular support beam 5 is inserted. The object (chimney 1) is cut out and carried out, and the lifted down device 8 is lowered while holding the cylindrical structure (chimney 1) by the amount cut and carried out, and the cylinder restraining means 3 and cylinder The support means 4 is rearranged upward.

このように、解体しようとする筒状構造物（煙突１）を複数の支柱１０に支持される架台９とこの架台９に配置される複数のリフトダウン装置８で保持しながら、筒身拘束手段３により筒状構造物（煙突１）の重心Ｇよりも上方の位置で水平移動を拘束するため、筒状構造物（煙突１）の転倒モーメントを有効に押さえ、安定して筒状構造物（煙突１）を保持することができる。また、その転倒モーメントを支持するための仮設構造物、仮設設備を小規模なものとすることができる。さらに、筒状構造物（煙突１）の地上近傍の所定高さに貫通口１６を形成し、この貫通口１６に、前記筒身拘束手段３から巻上装置６を介して吊り下げられた筒身支持手段４の筒身支持梁５を挿入し、この筒身支持梁５により筒状構造物（煙突１）を支持することにより、筒身支持手段４が筒状構造物（煙突１）を確実に支持し、安定して筒状構造物（煙突１）を保持することができる。
そして、筒身拘束手段３により筒状構造物（煙突１）を拘束したままの状態で、筒身支持梁５を貫通口１６から抜き取り、再び筒状構造物（煙突１）の地上近傍の所定高さに貫通口１６を形成し、巻上装置６を地上近傍の所定高さまで巻き上げ、貫通口１６に筒身支持梁５を挿入した後、リフトダウン装置８を作動させて筒身拘束手段３のみをその地上近傍の所定高さに相当する高さ分上昇させる。こうして筒身拘束手段３および筒身支持手段４を上方に盛り替えることができる。 In this way, while holding the cylindrical structure (chimney 1) to be disassembled by the gantry 9 supported by the plurality of columns 10 and the plurality of lift-down devices 8 arranged on the gantry 9 , the cylinder restraining means 3 restrains the horizontal movement at a position above the center of gravity G of the cylindrical structure (chimney 1), so that the overturning moment of the cylindrical structure (chimney 1) is effectively suppressed, and the cylindrical structure ( The chimney 1) can be held. Further, the temporary structure and the temporary equipment for supporting the overturning moment can be made small. Furthermore, a through-hole 16 is formed at a predetermined height near the ground of the cylindrical structure (chimney 1), and a cylinder suspended from the cylinder restraining means 3 through the hoisting device 6 at the through-hole 16 insert the cylinder body support beam 5 of the body support means 4, by supporting tubular structure (the chimney 1) the cylindrical body supporting beams 5, cylindrical body supporting means 4 the tubular structure (the chimney 1) It can support reliably and can hold a cylindrical structure (chimney 1) stably.
Then, with the tubular structure (chimney 1) being restrained by the tubular body restraining means 3, the tubular support beam 5 is removed from the through-hole 16, and again the predetermined vicinity of the tubular structure (chimney 1) near the ground. The through-hole 16 is formed at a height, the hoisting device 6 is wound up to a predetermined height near the ground, and the tubular support beam 5 is inserted into the through-hole 16, and then the lift-down device 8 is operated to operate the tubular restraining means 3. Is raised by a height corresponding to a predetermined height near the ground. In this way, the barrel restraining means 3 and the barrel support means 4 can be rearranged upward.

本発明によれば、解体しようとする筒状構造物を複数の支柱に支持される架台とこの架台に配置される複数のリフトダウン装置で保持しながら、その重心よりも上方の位置で水平移動を拘束することにより、筒状構造物の転倒モーメントを有効に押さえ、安定して筒状構造物を保持することができる。また、その転倒モーメントを支持するための仮設構造物、仮設設備を小規模なものとすることができる。さらに、筒状構造物の地上近傍の所定高さに貫通口を形成し、この貫通口に、筒身拘束手段から巻上装置を介して吊り下げられた筒身支持手段の筒身支持梁を挿入し、この筒身支持梁により筒状構造物を支持することにより、筒状構造物を確実に支持し、安定して筒状構造物を保持することができる。
そして、筒身拘束手段により筒状構造物を拘束したままの状態で、筒身支持梁を貫通口から抜き取り、再び筒状構造物の地上近傍の所定高さに貫通口を形成し、巻上装置を地上近傍の所定高さまで巻き上げ、貫通口に筒身支持梁を挿入した後、リフトダウン装置を作動させて筒身拘束手段のみをその地上近傍の所定高さに相当する高さ分上昇させる。こうして筒身拘束手段および筒身支持手段を上方に盛り替えることができる。 According to the present invention, a cylindrical structure to be disassembled is horizontally moved at a position above the center of gravity while being held by a gantry supported by a plurality of columns and a plurality of lift-down devices arranged on the gantry. By restraining the above, it is possible to effectively suppress the overturning moment of the cylindrical structure and stably hold the cylindrical structure. Further, the temporary structure and the temporary equipment for supporting the overturning moment can be made small. Furthermore, a through-hole is formed at a predetermined height near the ground of the cylindrical structure, and a tubular support beam of the tubular support means suspended from the tubular restraining means via the hoisting device is formed in the through-hole. By inserting and supporting the cylindrical structure with the cylindrical support beam, the cylindrical structure can be reliably supported and the cylindrical structure can be stably held.
Then, with the tubular structure restrained by the tubular body restraining means, the tubular support beam is removed from the through hole, and the through hole is formed again at a predetermined height near the ground of the tubular structure. After the device is rolled up to a predetermined height near the ground, and a cylindrical support beam is inserted into the through hole, the lift-down device is operated to raise only the cylindrical restraint means by a height corresponding to the predetermined height near the ground. . In this way, the cylinder restraining means and the cylinder supporting means can be rearranged upward.

以下、図を参照して本発明を実施するための最良の形態を詳細に説明する。
本実施の形態は、筒状構造物である鉄筋コンクリート製煙突１（以下、「煙突１」という。）の解体に適用したものである。図１は、本実施の形態に係る煙突の解体工法及び解体装置の概要を説明する側面図、図２は、同平面図である。 Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.
This embodiment is applied to the dismantling of a reinforced concrete chimney 1 (hereinafter referred to as “chimney 1”) that is a cylindrical structure. FIG. 1 is a side view for explaining an outline of a chimney demolition method and a demolition apparatus according to the present embodiment, and FIG. 2 is a plan view thereof.

図１に示すように、煙突１は、鉄塔などに周囲を支持されていない自立型の円柱状のものであり、その断面が基端部から頂部にかけて漸減する形状をしている。この煙突１の筒身１ａの基端部の下方には、煙突１の荷重を支持する鉄筋コンクリート製の煙突基礎１ｃが構築されている。 As shown in FIG. 1, the chimney 1 is a self-supporting columnar shape whose periphery is not supported by a steel tower or the like, and has a shape in which the cross section gradually decreases from the base end portion to the top portion. A chimney foundation 1c made of reinforced concrete that supports the load of the chimney 1 is constructed below the base end portion of the cylindrical body 1a of the chimney 1.

まず、このような煙突１の筒身１ａを解体するための解体装置２について説明する。図３（ａ）、（ｂ）はそれぞれ解体装置２を示す平面図、側面図である。この解体装置２は、煙突１の側周にほぼ等間隔に立設する４本の支柱１０に支持される架台９と、この架台９に配置される４基のリフトダウン装置８と、このリフトダウン装置８に保持され、煙突１の筒身１ａの重心よりも上方に位置してこの煙突１の筒身１ａの水平移動を拘束する筒身拘束手段３と、この筒身拘束手段３から吊り下げられ、煙突１の筒身１ａの地上近傍の所定高さに形成される貫通口１６に挿入される筒身支持梁５で煙突１の筒身１ａの荷重を支持する筒身支持手段４、等を備えている。 First, the dismantling apparatus 2 for disassembling such a cylinder 1a of the chimney 1 will be described. 3A and 3B are a plan view and a side view showing the disassembling apparatus 2, respectively. The dismantling device 2 includes a gantry 9 supported by four struts 10 erected on the side periphery of the chimney 1 at substantially equal intervals, four lift-down devices 8 disposed on the gantry 9, and the lift A cylinder restraining means 3 that is held by the down device 8 and is located above the center of gravity of the cylinder 1a of the chimney 1 and restrains the horizontal movement of the cylinder 1a of the chimney 1, and suspended from the cylinder restraining means 3 A cylinder support means 4 which supports the load of the cylinder 1a of the chimney 1 with a cylinder support beam 5 which is lowered and inserted into the through hole 16 formed at a predetermined height near the ground of the cylinder 1a of the chimney 1; Etc.

図３（ｂ）に示すように、煙突１の煙突基礎１ｃ上に煙突１の側周にほぼ等間隔に４つの支柱基礎１０ａが設けられ、それぞれの支柱基礎１０ａ上に支柱１０が複数の支柱材１０ｂを連接して設けられている。そして、これらの支柱１０に支持されて架台９が組み立てられている。 As shown in FIG. 3 (b), four strut bases 10a are provided on the chimney base 1c of the chimney 1 at substantially equal intervals around the side of the chimney 1, and the struts 10 have a plurality of struts on each strut base 10a. The material 10b is connected and provided. The gantry 9 is assembled by being supported by these columns 10.

リフトダウン装置８は、図３（ｂ）に示すように、前記架台９上に煙突１の筒身１ａの側周を取り囲んで４箇所に配置されている。各リフトダウン装置８は、２台のジャッキ８ａと１本のリフティングバー８ｂとで構成されている。ジャッキ８ａのストロークごとにリフティングバー８ｂの盛替操作を行い、所定高さをリフトダウンさせて煙突１の筒身１ａを保持しながら昇降させることができる。 As shown in FIG. 3 (b), the lift-down device 8 is arranged at four locations on the frame 9 so as to surround the side periphery of the cylinder 1 a of the chimney 1. Each lift-down device 8 is composed of two jacks 8a and one lifting bar 8b. The repositioning operation of the lifting bar 8b is performed for each stroke of the jack 8a, and the predetermined height can be lifted down and moved up and down while holding the cylinder 1a of the chimney 1.

筒身拘束手段３は、図３に示すように、上方においてリフトダウン装置８により保持され、煙突１の筒身１ａの重心Ｇよりも上方に位置して、煙突１の筒身１ａの側周を取り囲んで組み立てられている。この筒身拘束手段３は、筒身１ａに当接してその水平移動を拘束する上枠材３ａと、この上枠材３ａを支持する下枠材３ｂとからなる。上枠材３ａには、筒身１ａの断面の漸減に追従させるように、径方向内方へ付勢する油圧装置等の付勢手段（図示せず）が設けられている。下枠材３ｂは、上方においてリフトダウン装置８のリフティングバー８ｂによって保持され、下方において筒身１ａを支持する筒身支持手段４を吊り下げている。 As shown in FIG. 3, the cylinder restraining means 3 is held by the lift-down device 8 at the upper side, and is positioned above the center of gravity G of the cylinder 1 a of the chimney 1, so that the side circumference of the cylinder 1 a of the chimney 1 is Is assembled around. The cylinder restraining means 3 includes an upper frame member 3a that abuts the cylinder 1a and restrains the horizontal movement thereof, and a lower frame member 3b that supports the upper frame member 3a. The upper frame member 3a is provided with urging means (not shown) such as a hydraulic device for urging radially inward so as to follow the gradual decrease of the cross section of the cylindrical body 1a. The lower frame member 3b is held by the lifting bar 8b of the lift-down device 8 in the upper part and suspends the cylinder support means 4 that supports the cylinder 1a in the lower part.

この筒身拘束手段３の設置される高さは、煙突１の筒身１ａの壁厚やライニング厚さを基に算出した煙突１の筒身１ａの重心Ｇよりも上方の位置に設定されている。また、前記支柱１０や架台９の高さは、この筒身拘束手段３が設置される高さに応じて設定されている。 The installation height of the cylinder restraining means 3 is set at a position above the center of gravity G of the cylinder 1a of the chimney 1 calculated based on the wall thickness and lining thickness of the cylinder 1a of the chimney 1. Yes. Further, the heights of the support column 10 and the gantry 9 are set according to the height at which the cylindrical body restraining means 3 is installed.

このように、解体しようとする煙突１の筒身１ａを保持しながら、その重心Ｇよりも上方に位置してこの煙突１の筒身１ａの水平移動を拘束する筒身拘束手段３を備えることにより、煙突１の転倒モーメントを有効に押さえ、安定して煙突１を保持することができる。また、その転倒モーメントを支持するための解体装置２等の仮設構造物、仮設設備を小規模なものとすることができる。 As described above, the cylinder restraining means 3 is provided which is positioned above the center of gravity G and restrains the horizontal movement of the cylinder 1a of the chimney 1 while holding the cylinder 1a of the chimney 1 to be disassembled. Thus, the overturning moment of the chimney 1 can be effectively suppressed and the chimney 1 can be held stably. Further, the temporary structure such as the dismantling device 2 and the temporary equipment for supporting the overturning moment can be reduced in size.

筒身支持手段４は、図３（ｂ）に示すように、煙突１の筒身１ａの地上近傍の所定の高さにおいて煙突１の筒身１ａの荷重を支持する筒身支持梁５と、この筒身支持梁５を吊り下げて支持する巻上装置６とからなる。 As shown in FIG. 3 (b), the cylinder support means 4 includes a cylinder support beam 5 that supports the load of the cylinder 1 a of the chimney 1 at a predetermined height near the ground of the cylinder 1 a of the chimney 1, It comprises a hoisting device 6 that suspends and supports the cylindrical support beam 5.

巻上装置６は、煙突１の筒身１ａの側周を取り囲んで８箇所に設けられ、筒身拘束手段３の下枠材３ｂの下端に固定されている。各巻上装置６には、図６に示すように、チェーン等の吊材６ａが２本吊り下げられており、各吊材６ａの下端部には筒身支持梁５と接続するための吊ピース６ｂが設けられている。この巻上装置６は、筒身支持梁５を吊り下げ支持することができ、また巻き上げることができる。 The hoisting device 6 is provided at eight locations surrounding the side periphery of the cylinder 1 a of the chimney 1, and is fixed to the lower end of the lower frame member 3 b of the cylinder restraining means 3. As shown in FIG. 6, two hoisting materials 6 a such as chains are hung on each hoisting device 6, and a hanger piece for connecting to the cylindrical support beam 5 at the lower end of each hoisting material 6 a. 6b is provided. This hoisting device 6 can suspend and support the cylindrical support beam 5 and can also wind it up.

筒身支持梁５は、図６、７に示すように、Ｈ形鋼であり、その両端部付近の上面に巻上装置６の吊ピース６ｂが取り付けられ、吊ピース６ｂの取付箇所には、補強材５ｂが溶接されている。そして、２本の筒身支持梁５が、水平にした状態で上下に十字状に重ねて配置されている。これらの筒身支持梁５は、煙突１の筒身１ａの地上近傍の所定高さに形成すれる貫通口１６に挿入される。 As shown in FIGS. 6 and 7, the cylindrical support beam 5 is an H-shaped steel, and the suspension piece 6 b of the hoisting device 6 is attached to the upper surface in the vicinity of both ends thereof. The reinforcing material 5b is welded. And the two cylindrical support beams 5 are arranged in a cross shape in the vertical direction in a horizontal state. These cylindrical support beams 5 are inserted into through-holes 16 formed at a predetermined height near the ground surface of the cylindrical body 1 a of the chimney 1.

また、図３（ｂ）に示すように、これらの筒身支持梁５を鉛直方向に案内するガイド材７が各筒身支持梁５の両端部の外方に設けられ、筒身支持梁５の両端部には、ガイド材７に当接して回転可能なローラ５ａが取り付けられている。 Further, as shown in FIG. 3B, guide members 7 for guiding the cylindrical support beams 5 in the vertical direction are provided outside the both ends of each cylindrical support beam 5. At both ends, rollers 5a that are in contact with the guide member 7 and are rotatable are attached.

このように、煙突１の筒身１ａの地上近傍の所定高さに形成される貫通口１６に挿入される筒身支持梁５で煙突１の筒身１ａを支持する筒身支持手段４を備えることにより、煙突１の筒身１ａを確実に支持し、安定して煙突１の筒身１ａを保持することができる。そして、筒身支持梁５がガイド材７に沿って案内され、また、煙突１の筒身１ａの下端部が水平移動を拘束されているので、安定した状態で煙突１の筒身１ａを下降させることができる。 In this way, the cylinder support means 4 is provided which supports the cylinder 1a of the chimney 1 with the cylinder support beam 5 inserted into the through-hole 16 formed at a predetermined height near the ground of the cylinder 1a of the chimney 1. By this, the cylinder 1a of the chimney 1 can be reliably supported, and the cylinder 1a of the chimney 1 can be stably held. And the cylindrical support beam 5 is guided along the guide material 7, and since the lower end of the cylindrical body 1a of the chimney 1 is restrained from horizontal movement, the cylindrical body 1a of the chimney 1 is lowered in a stable state. Can be made.

また、解体装置２は、上記の構成の他に、煙突１の筒身１ａを所定の高さで切断する筒身切断手段（図示しない）や、切断された筒身切断片１ｂを煙突１の下方から搬出するための搬出レール１１やこの搬出レール１１上を移動する搬出台車（図示しない）等の筒身搬出手段や、搬出された筒身切断片１ｂを解体する筒身解体重機１２等の解体手段を備えている。 In addition to the above-described configuration, the dismantling device 2 includes a barrel cutting means (not shown) that cuts the barrel 1a of the chimney 1 at a predetermined height, and the cut barrel cut piece 1b of the chimney 1 Such as a carry-out rail 11 for carrying out from below, a carry-out means such as a carry-out carriage (not shown) moving on the carry-out rail 11, a barrel-disintegrating weight machine 12 for breaking up the carried-out cut piece 1 b, etc. Dismantling means are provided.

次に、上記構成からなる解体装置２を用いて、前記煙突１を解体する方法について説明する。図４、５は、この煙突１の解体手順の概要を示している。まず、煙突１の解体を始める準備として、煙突基礎１ｃの上面の一部を露出させるように地盤を掘削し、解体装置２を煙突基礎１ｃに支持させながら設置していく。 Next, a method of dismantling the chimney 1 using the dismantling apparatus 2 having the above configuration will be described. 4 and 5 show an outline of the procedure for disassembling the chimney 1. First, as preparation for starting the dismantling of the chimney 1, the ground is excavated so as to expose a part of the upper surface of the chimney foundation 1c, and the dismantling device 2 is installed while being supported by the chimney foundation 1c.

解体装置２を設置する手順としては、掘削によって一部露出した煙突基礎１ｃの上面に支柱１０を支持する支柱基礎１０ａを煙突１の側周にほぼ等間隔に４箇所構築する。この支柱基礎１０ａ上に支柱材１０ｂを連接して４本の支柱１０を所定の高さまで立設する。ここで、所定の高さとは、煙突１の筒身１ａの重心よりも上方になるように設定された筒身拘束手段３の位置に対応した高さである。また、支柱１０には、必要に応じ水平材１０ｃや斜材１０ｄ、控え索１０ｅを設ける。 As a procedure for installing the dismantling apparatus 2, four pillar foundations 10a that support the pillars 10 on the upper surface of the chimney foundation 1c partially exposed by excavation are constructed on the side periphery of the chimney 1 at almost equal intervals. The column material 10b is connected on the column base 10a, and the four columns 10 are erected up to a predetermined height. Here, the predetermined height is a height corresponding to the position of the cylinder restraining means 3 set so as to be above the center of gravity of the cylinder 1 a of the chimney 1. Moreover, the support | pillar 10 is provided with the horizontal material 10c, the diagonal material 10d, and the reservation rope 10e as needed.

立設した支柱１０の上端部に支持させて架台９を煙突１の筒身１ａの側周を取り囲むように組み立てる。組み立てられた架台９上に煙突１の筒身１ａの側周を取り囲んで、前記リフトダウン装置８をほぼ等間隔に４箇所に配置する。これらのリフトダウン装置８の下端部に前記筒身拘束手段３を、煙突１の筒身１ａの重心Ｇよりも上方の位置で煙突１の筒身１ａの側周を取り囲むように取り付け、この筒身１ａの水平移動を拘束する。 The gantry 9 is assembled so as to surround the side periphery of the cylindrical body 1a of the chimney 1 while being supported by the upper end of the upright column 10. The lift-down devices 8 are arranged at approximately four positions at equal intervals so as to surround the side periphery of the cylinder 1a of the chimney 1 on the assembled base 9. The cylinder restraining means 3 is attached to the lower end of these lift-down devices 8 so as to surround the side circumference of the cylinder 1a of the chimney 1 at a position above the center of gravity G of the cylinder 1a of the chimney 1. The horizontal movement of the body 1a is restrained.

このように、その重心Ｇよりも上方の位置で水平移動を拘束することにより、煙突１の筒身１ａを保持した際に、煙突１の筒身１ａの転倒モーメントを有効に押さえ、安定して煙突１の筒身１ａを保持することができる。また、その転倒モーメントを支持するための仮設構造物、仮設設備を小規模なものとすることができる。 In this way, by restraining the horizontal movement at a position above the center of gravity G, when the cylinder body 1a of the chimney 1 is held, the falling moment of the cylinder body 1a of the chimney 1 is effectively suppressed, and stable. The cylinder 1a of the chimney 1 can be held. Further, the temporary structure and the temporary equipment for supporting the overturning moment can be made small.

そして、この筒身拘束手段３の下方に前記筒身支持梁５を除く前記筒身支持手段４を取り付けておく。また、この筒身支持梁５を案内する前記ガイド材７を予め立設しておく。 The tubular body support means 4 excluding the tubular body support beam 5 is attached below the tubular body restraining means 3. Further, the guide member 7 for guiding the cylindrical support beam 5 is erected in advance.

さらに、煙突１の地上近傍における、煙突１の筒身１ａの切断、後記する貫通口１６の形成および筒身解体重機１２による筒身切断片１ｂの解体等の作業を行う領域を取り囲んで足場１３やトラス１４を組み立て、区画養生シート１５で覆う。 Further, in the vicinity of the chimney 1 near the ground, the scaffold 13 surrounds an area where work such as cutting of the cylinder 1 a of the chimney 1, formation of a through-hole 16 to be described later, and dismantling of the cylinder cutting piece 1 b by the cylinder lifting machine 12 is performed. The truss 14 is assembled and covered with the section curing sheet 15.

このように、地上近傍において、区画養生シートで覆うことにより、煙突１を切断または破砕する際に発生する解体片や粉塵が、外側に飛散するのを防止することができる。特に、ダイオキシン汚染施設に対しては効果的である。 In this way, by covering with the section curing sheet in the vicinity of the ground, it is possible to prevent dismantling pieces and dust generated when cutting or crushing the chimney 1 from being scattered outside. It is especially effective for dioxin contaminated facilities.

そして、図６、７に示すように、貫通口１６を、煙突１の筒身１ａの地上近傍の所定高さに形成する。煙突１の筒身１ａの円周上において貫通口１６が形成される位置は、水平にした状態で上下に十字状に重ねて構成した２本の筒身支持梁５が挿入される位置である。この形成された貫通口１６にＨ形鋼等の筒身支持梁５を挿入し、すでに取り付けてある巻上装置６の吊材６ａに吊ピース６ｂを介して接続する。なお、貫通口１６の大きさは、筒身支持梁の挿入、抜取りのために所定の隙間を確保している。また、筒身支持梁５の上端面と貫通口１６の上辺との間に堅木等の緩衝材１７を挿入する。 Then, as shown in FIGS. 6 and 7, the through-hole 16 is formed at a predetermined height near the ground surface of the cylinder 1 a of the chimney 1. The position where the through-hole 16 is formed on the circumference of the cylindrical body 1a of the chimney 1 is a position where two cylindrical support beams 5 configured to be stacked in a cross shape vertically are inserted in a horizontal state. . The cylindrical support beam 5 such as H-shaped steel is inserted into the formed through-hole 16 and connected to the suspension member 6a of the hoisting device 6 already attached via the suspension piece 6b. In addition, the size of the through-hole 16 ensures a predetermined gap for insertion and extraction of the cylindrical support beam. Further, a buffer material 17 such as hardwood is inserted between the upper end surface of the cylindrical support beam 5 and the upper side of the through-hole 16.

このように、煙突１の筒身１ａの地上近傍の所定高さに貫通口１６を形成し、この貫通口１６に筒身支持梁５を挿入し、この筒身支持梁５により煙突１の筒身１ａを支持する際に、煙突１の筒身１ａを確実に支持し、安定して煙突１の筒身１ａを保持することができる。 In this way, the through-hole 16 is formed at a predetermined height near the ground surface of the cylinder 1 a of the chimney 1, and the cylinder support beam 5 is inserted into the through-hole 16, and the cylinder of the chimney 1 is formed by the cylinder support beam 5. When supporting the body 1a, the cylinder 1a of the chimney 1 can be reliably supported, and the cylinder 1a of the chimney 1 can be stably held.

以上で、煙突１への解体装置２の設置作業は、後述する搬出レール１１、搬出台車とその周辺の構成部材を除いて終了である。 With the above, the installation work of the dismantling device 2 to the chimney 1 is completed except for a carry-out rail 11, a carry-out carriage and its peripheral components described later.

このように、解体装置２の設置作業は、ほぼ煙突１の重心Ｇの高さまでであり、煙突１の頂部にまで達する高所作業とはならず、作業の安全性を向上させることができるとともに、解体装置設置のためのクレーンを小型化し、安全設備を簡素化することができる。また、作業エリアを小さくできるため、市街地の狭い工事条件下においてはメリットが大きい。 Thus, the installation work of the dismantling device 2 is almost up to the height of the center of gravity G of the chimney 1 and is not a high-place work reaching the top of the chimney 1 and can improve the safety of the work. The crane for installing the dismantling device can be downsized and the safety equipment can be simplified. In addition, since the work area can be made small, the merit is great under the construction conditions where the city area is narrow.

次に、煙突１の筒身１ａの切断、搬出、解体作業に入る。まず、煙突１の筒身１ａの基端部を地表面付近の位置Ｓ１で輪切り状態に切断する。このときには、煙突１の筒身１ａには前記筒身拘束手段３および筒身支持手段４が取り付けられており、煙突１の筒身１ａが転倒するおそれはない。 Next, cutting, carrying out, and disassembling work of the cylindrical body 1a of the chimney 1 are started. First, the base end portion of the cylinder 1a of the chimney 1 is cut into a ring-cut state at a position S1 near the ground surface. At this time, the cylinder restraint means 3 and the cylinder support means 4 are attached to the cylinder 1a of the chimney 1, and there is no possibility that the cylinder 1a of the chimney 1 will fall down.

そして、リフトダウン装置８を作動させて、一旦下端部が切断された煙突１の筒身１ａを上昇させる。筒身１ａを上昇させて保持した状態で、切断された筒身切断片１ｂを搬出するための搬出レール１１を、上昇させた筒身１ａの下方から側方まで敷設し、その搬出レール１１上に搬出台車を移動可能に配置する。 And the lift-down apparatus 8 is operated and the cylinder 1a of the chimney 1 from which the lower end part was once cut | lifted is raised. In the state where the cylinder 1a is raised and held, a carry-out rail 11 for carrying out the cut piece 1b is laid from the lower side of the raised cylinder 1a to the side, and on the carry-out rail 11 An unloading cart is arranged to be movable.

再度、リフトダウン装置８を作動させて、煙突１の筒身１ａをガイド材７に案内させて下降させ、搬出台車上に載置する。そして、リフトダウン装置８により煙突１を支持しつつ、煙突１の筒身１ａをその基端部から上方へ一定寸法、例えば筒身支持梁５の挿入位置のほぼ半分の高さの位置Ｓ２で輪切り状態に切断する。 The lift-down device 8 is actuated again, the cylinder 1a of the chimney 1 is guided down by the guide member 7, and placed on the carry-out carriage. Then, while supporting the chimney 1 by the lift-down device 8, the cylinder 1a of the chimney 1 is fixed upward from its base end, for example, at a position S2 that is almost half the height of the insertion position of the cylinder support beam 5. Cut into a circle.

煙突１の筒身１ａが切断されると、煙突１の筒身１ａの重心Ｇの位置は上方に移動するが、前記筒身拘束手段３をこの移動後の重心位置Ｇよりも上方に設定しておけばよい。 When the cylinder 1a of the chimney 1 is cut, the position of the center of gravity G of the cylinder 1a of the chimney 1 moves upward, but the cylinder restraining means 3 is set above the center of gravity G after the movement. Just keep it.

そして、リフトダウン装置８を作動させて煙突１の筒身１ａをわずかに上昇させて保持し、筒身切断片１ｂが載置された搬出台車を煙突１の筒身１ａの下方から側方へ移動させ、筒身切断片１ｂを搬出する。搬出された筒身切断片１ｂは、筒身解体重機１２により所定の場所で破砕するなどして処理する。また、搬出台車は、次の筒身切断片１ｂを搬出するために煙突１の筒身１ａの下方に戻される。 Then, the lift-down device 8 is actuated to slightly raise and hold the cylinder 1a of the chimney 1, and the unloading carriage on which the cylinder cut piece 1b is placed is moved from the lower side of the cylinder 1a of the chimney 1 to the side. It is made to move and the cylinder cut piece 1b is carried out. The barrel cut piece 1b carried out is processed by being crushed at a predetermined location by the barrel body weight removing machine 12. Further, the carry-out cart is returned to the lower side of the cylinder 1a of the chimney 1 in order to carry out the next cylinder-cut piece 1b.

切断、搬出されて空間となった部分に、リフトダウン装置８を作動させることにより、残った煙突１の筒身１ａを下降させ、再び搬出台車上に載置する。そして、リフトダウン装置８により煙突１を保持しつつ、煙突１の筒身１ａをその基端部から上方へ一定寸法、筒身支持梁５の挿入位置のやや下方の位置Ｓ３で輪切り状態に切断する。そして、最初の筒身切断片１ｂの搬出と同様に、煙突１の筒身１ａの下方から側方へ搬出する。その後、リフトダウン装置８を作動させて煙突１の筒身１ａを再び下降させる。 The cylinder 1a of the remaining chimney 1 is lowered by operating the lift-down device 8 in the space that has been cut and carried out, and placed again on the carry-out carriage. Then, while holding the chimney 1 by the lift-down device 8, the cylinder 1a of the chimney 1 is cut from the base end portion to a certain size and cut into a ring shape at a position S3 slightly below the insertion position of the cylinder support beam 5. To do. And it carries out to the side from the downward direction of the cylinder 1a of the chimney 1 similarly to the carrying-out of the first cylinder cut piece 1b. Thereafter, the lift-down device 8 is operated to lower the cylinder 1a of the chimney 1 again.

以上の２回の煙突１の筒身１ａの切断、搬出作業により、筒身支持梁５が地表面付近まで下降した状態となるので、筒身拘束手段３および筒身支持手段４を上方に盛り替える。まず、筒身拘束手段３により煙突１の筒身１ａを拘束したままの状態で、筒身支持梁５を吊ピース６ｂから取外し、貫通口１６から抜き取って分解する。 The cylindrical support beam 5 is lowered to the vicinity of the ground surface by cutting and carrying out the cylindrical body 1a of the chimney 1 twice, so that the cylindrical body restraining means 3 and the cylindrical body support means 4 are raised upward. Change. First, in a state where the tube body 1a of the chimney 1 is held by the tube body restraining means 3, the tube body support beam 5 is removed from the suspension piece 6b, and is taken out from the through-hole 16 and disassembled.

そして、再び地上近傍の所定高さに貫通口１６を形成し、巻上装置６で吊ピース６ｂをその地上近傍の所定高さまで巻き上げる。この貫通口１６に筒身支持梁５を組み立てて挿入し、再び巻上装置６の吊材６ａに吊ピース６ｂと接続する。筒身支持梁５を煙突１の筒身１ａに取り付けた後、リフトダウン装置８を作動させて筒身拘束手段３のみをその地上近傍の所定高さに相当する高さ分上昇させる。 Then, the through hole 16 is formed again at a predetermined height near the ground, and the hoisting device 6 winds the suspension piece 6b to a predetermined height near the ground. The cylindrical support beam 5 is assembled and inserted into the through-hole 16 and connected to the suspension member 6a of the hoisting device 6 again with the suspension piece 6b. After attaching the cylinder support beam 5 to the cylinder 1a of the chimney 1, the lift-down device 8 is operated to raise only the cylinder restraining means 3 by a height corresponding to a predetermined height near the ground.

以上の筒身１ａの切断搬出、下降および筒身拘束手段３、筒身支持手段４の盛替えの作業を繰り返して、煙突１の筒身１ａをその基端部から順次解体していく。 The above-described operations of cutting and unloading the barrel 1a, lowering, and refilling the barrel restraint means 3 and the barrel support means 4 are repeated, and the barrel 1a of the chimney 1 is sequentially disassembled from its base end.

煙突１の筒身１ａが順次解体され、その筒身１ａの頂部が筒身拘束手段３のやや上方の位置にまで下降すると、図５（ａ）から図５（ｂ）に示す状態となる。これ以上筒身１ａを下降させると筒身拘束手段３により筒身１ａを拘束できなくなるため、リフトダウン装置８のリフティングバー８ｂを継ぎ足して、筒身拘束手段３が残った煙突１の筒身１ａの重心Ｇの位置よりも上方に位置するように、筒身拘束手段３を下降させる。そして、上記した筒身１ａの切断、下降および筒身拘束手段３、筒身支持手段４の盛替えの作業を同様に繰り返して順次解体していく。 When the cylinder 1a of the chimney 1 is sequentially disassembled and the top of the cylinder 1a is lowered to a position slightly above the cylinder restraining means 3, the state shown in FIGS. 5 (a) to 5 (b) is obtained. If the barrel 1a is further lowered, the barrel 1a cannot be restrained by the barrel restraining means 3. Therefore, the lifting bar 8b of the lift-down device 8 is added to the cylinder 1a of the chimney 1 where the barrel restraining means 3 remains. The cylinder restraining means 3 is lowered so as to be positioned above the position of the center of gravity G of the cylinder. Then, the above-described cutting and lowering of the barrel 1a and the replacement of the barrel restraint means 3 and the barrel support means 4 are repeated in the same manner and sequentially disassembled.

さらに煙突１の筒身１ａの解体が進み、煙突１の筒身１ａの重心Ｇが筒身支持梁５よりも下方の位置にまで下降し、リフトダウン装置８のリフティングバー８ｂを継ぎ足すことができない状態となった場合には、煙突１の筒身１ａの重心Ｇがその筒身支持梁５の十分に下方に位置するため、煙突１の頂部付近を筒身支持梁５のみで支持しても、残った煙突１の筒身１ａを安定して下降させ解体することができる。 Further, dismantling of the cylinder 1a of the chimney 1 proceeds, the center of gravity G of the cylinder 1a of the chimney 1 descends to a position below the cylinder support beam 5, and the lifting bar 8b of the lift-down device 8 can be added. When it becomes impossible, since the center of gravity G of the cylinder 1a of the chimney 1 is located sufficiently below the cylinder support beam 5, the vicinity of the top of the chimney 1 is supported only by the cylinder support beam 5. However, the remaining cylinder 1a of the chimney 1 can be stably lowered and disassembled.

以上で、煙突１の筒身１ａの解体作業は終了し、解体装置２を撤去すれば煙突１の解体工事が完了する。 With the above, the dismantling work of the cylinder 1a of the chimney 1 is completed, and the dismantling work of the chimney 1 is completed when the dismantling device 2 is removed.

このように、煙突１の筒身１ａを保持しながら、常に筒身拘束手段３により煙突１の筒身１ａの重心Ｇよりも上方の位置で水平移動を拘束するため、煙突１の筒身１ａの転倒モーメントを有効に押さえ、安定して煙突１の筒身１ａを保持することができる。また、その転倒モーメントを支持するための解体装置２等の仮設構造物、仮設設備を小規模なものとすることができる。 Thus, the cylinder 1a of the chimney 1 is always restrained by the cylinder restraining means 3 at a position above the center of gravity G of the cylinder 1a of the chimney 1 while holding the cylinder 1a of the chimney 1. The cylinder 1a of the chimney 1 can be stably held by effectively suppressing the overturning moment. Further, the temporary structure such as the dismantling device 2 and the temporary equipment for supporting the overturning moment can be reduced in size.

さらに、煙突１の筒身１ａの地上近傍の所定高さに貫通口１６を形成し、この貫通口１６に筒身支持梁５を挿入し、この筒身支持梁５により煙突１の筒身１ａを支持することにより、常に筒身支持手段４が煙突１の筒身１ａを確実に支持し、安定して煙突１の筒身１ａを保持することができる。 Further, a through-hole 16 is formed at a predetermined height near the ground surface of the cylinder 1 a of the chimney 1, and the cylinder support beam 5 is inserted into the through-hole 16, and the cylinder 1 a of the chimney 1 is inserted by the cylinder support beam 5. By supporting this, the cylinder support means 4 can always reliably support the cylinder 1a of the chimney 1 and stably hold the cylinder 1a of the chimney 1.

なお、以上の実施の形態においては、鉄筋コンクリート製の円柱状の煙突１を解体の対象としたが、本発明はこれに限定されるものではなく、鋼製等の筒状構造物でも良く、角形断面等の筒状構造物でも良い。また、煙突１本体が複数の場合であっても、本発明を適用できることは勿論である。 In the above embodiment, the cylindrical chimney 1 made of reinforced concrete is the object of dismantling, but the present invention is not limited to this, and may be a cylindrical structure made of steel, etc. A cylindrical structure such as a cross section may be used. Of course, the present invention can be applied even when the chimney 1 has a plurality of main bodies.

また、リフトダウン装置８を２台のジャッキ８ａと１本のリフティングバー８ｂからなるものとしたが、筒状構造物を所定高さ上昇、下降させることができるものであれば良く、その構成等は任意である。その他、筒身拘束手段３、筒身支持手段４等の具体的な細部構造等についても適宜に変更可能であることは勿論である。
また、筒身支持梁５の設置高さや筒身１ａの１回の切断寸法は、任意であり、筒状構造物の高さや荷重に応じて適宜に設定可能である。 In addition, the lift-down device 8 is composed of two jacks 8a and one lifting bar 8b. However, the lift-down device 8 only needs to be able to raise and lower the cylindrical structure by a predetermined height. Is optional. In addition, it is needless to say that specific details such as the cylinder restraining means 3 and the cylinder supporting means 4 can be appropriately changed.
Moreover, the installation height of the cylinder support beam 5 and the one-time cutting dimension of the cylinder 1a are arbitrary, and can be appropriately set according to the height and load of the cylindrical structure.

本発明を適用した実施の形態である、煙突１の解体の概要を説明する側面図である。It is a side view explaining the outline | summary of the dismantling of the chimney 1 which is embodiment which applied this invention. 同、煙突１の解体の概要を説明する平面図である。It is a top view explaining the outline | summary of the dismantling of the chimney. 同、煙突１の解体装置２を示す図であり、（ａ）は平面図、（ｂ）は側面図である。It is a figure which shows the dismantling apparatus 2 of the chimney 1, and (a) is a top view, (b) is a side view. 同、煙突１の解体を開始した状態を示す側面図である。It is a side view which shows the state which started demolition of the chimney. 同、煙突１の解体が進んだ状態を示す側面図である。It is a side view which shows the state which the dismantling of the chimney 1 advanced. 同、筒身支持梁５を設置した状態を示す図であり（ａ）は横断面図、（ｂ）は側面図である。The figure which shows the state which installed the cylindrical support beam 5 similarly, (a) is a cross-sectional view, (b) is a side view. 同、貫通口１６に筒身支持梁５を挿入した状態を示す詳細図である。FIG. 5 is a detailed view showing a state where the cylindrical support beam 5 is inserted into the through-hole 16.

Explanation of symbols

１鉄筋コンクリート製煙突（筒状構造物）
１ａ筒身
１ｂ筒身切断片
２解体装置
３筒身拘束手段
４筒身支持手段
５筒身支持梁
６巻上装置
７ガイド材
８リフトダウン装置
９架台
１０支柱
１１搬出レール
１２筒身解体重機
１６貫通口
Ｇ重心 1 Reinforced concrete chimney (tubular structure)
DESCRIPTION OF SYMBOLS 1a Cylinder 1b Cylinder cut piece 2 Cylinder restraint means 4 Cylinder restraint means 4 Cylinder support means 5 Cylinder support beam 6 Hoisting device 7 Guide material 8 Lift-down apparatus 9 Base 10 Support | pillar 11 Unloading rail 12 Through hole G Center of gravity

Claims

An apparatus for sequentially dismantling from a base end portion of a cylindrical structure while holding the cylindrical structure,
A pedestal supported by a plurality of support columns standing at substantially equal intervals on the side periphery of the cylindrical structure;
A plurality of lift-down devices arranged on the mount;
A cylinder restraining means that is held by the lift-down device and is located above the center of gravity of the cylindrical structure and restrains the horizontal movement of the cylindrical structure;
The tubular structure is supported by a tubular support beam that is suspended from the tubular restraining means via a hoisting device and inserted into a through-hole formed at a predetermined height near the ground of the tubular structure. A tubular structure disassembling apparatus comprising:

A method of sequentially dismantling from a base end portion of a tubular structure while holding the tubular structure using the tubular structure disassembling apparatus according to claim 1,
The cylindrical body restraining means restrains the horizontal movement of the tubular structure, and the tubular body supporting means suspended from the tubular body restraining means via a hoisting device supports the load of the cylindrical structure,
Cutting and unloading the cylindrical structure at a position below the position of the through-hole into which the cylindrical support beam is inserted,
Disassembling the cylindrical structure characterized in that the cylindrical structure is lowered while being held by the lift-down device by the amount cut and carried out, and the cylinder restraining means and the cylinder supporting means are rearranged upward. Method.