JP7042592B2

JP7042592B2 - Concrete-filled steel pipe column demolition method

Info

Publication number: JP7042592B2
Application number: JP2017224060A
Authority: JP
Inventors: 政典河野; 孝徳起橋
Original assignee: Okumura Corp
Current assignee: Okumura Corp
Priority date: 2017-11-21
Filing date: 2017-11-21
Publication date: 2022-03-28
Anticipated expiration: 2037-11-21
Also published as: JP2019094661A

Description

本発明は、鉄骨梁と結合される仕口部位置にダイアフラムが接合されたコンクリート充填鋼管柱を対象として、簡易な部材を用い、容易な手順で、加える力も小さくて済むコンクリート充填鋼管柱解体工法に関する。 The present invention is a concrete-filled steel column dismantling method for a concrete-filled steel column in which a diaphragm is joined at the joint position to be joined to a steel beam, using a simple member, a simple procedure, and a small force to be applied. Regarding.

コンクリート充填鋼管柱を解体する技術として、特許文献１が知られている。特許文献１の「コンクリート充填鋼管柱の切断・解体工法及び鋼管切断装置」は、ＣＦＴ柱を解体・撤去する鋼管の切断・解体工法と同工法の実施に好適な鋼管切断装置を提供することを課題とし、ＣＦＴ柱の上方部に転倒防止処理を施し、鋼管切断位置の外周部へガイドレールをリング状に取り付け、当該ガイドレールのＣＦＴ柱への位置決め固定の状態を確定処理する。ガイドレールの外周部位へ、鋼管切断機構部を、ガイドレールを伝って柱の円周方向への移動が可能に取り付けて鋼管切断装置を組み立てる。鋼管切断機構部をガイドレールに沿って周回移動させつつ鋼管切断部により鋼管の切断を円周方向へ進める。切断が完了した後に、鋼管切断機構部およびガイドレールを解体し撤去する。その後、ＣＦＴ柱のコンクリートを、鋼管切断位置において切断し、又は横力ないし曲げ力を加えて折断し、若しくは軸線と直角方向の割裂力を加えて分断するようにしている。鋼管の切断位置は、梁の接合位置から離れた柱の一般部分となっている。 Patent Document 1 is known as a technique for dismantling a concrete-filled steel pipe column. Patent Document 1 "cutting / dismantling method for concrete-filled steel pipe columns and steel pipe cutting device" provides a steel pipe cutting device suitable for carrying out the same method as the steel pipe cutting / dismantling method for dismantling / removing CFT columns. As an issue, a fall prevention treatment is applied to the upper part of the CFT column, a guide rail is attached in a ring shape to the outer peripheral portion of the steel pipe cutting position, and the state of positioning and fixing of the guide rail to the CFT column is determined. A steel pipe cutting mechanism is attached to the outer peripheral part of the guide rail so that the column can be moved in the circumferential direction along the guide rail to assemble the steel pipe cutting device. While moving the steel pipe cutting mechanism part orbiting along the guide rail, the steel pipe cutting part advances the cutting of the steel pipe in the circumferential direction. After the cutting is completed, the steel pipe cutting mechanism and the guide rail are disassembled and removed. After that, the concrete of the CFT column is cut at the steel pipe cutting position, or is broken by applying a lateral force or a bending force, or is divided by applying a splitting force in the direction perpendicular to the axis. The cutting position of the steel pipe is the general part of the column away from the joint position of the beam.

他方、コンクリート充填鋼管柱の中には、鉄骨梁の接合位置に内ダイアフラムを設けるようにした技術が、特許文献２で知られている。特許文献２の「コンクリート充填鋼管柱」は、鋼管柱と、鋼管柱に充填された充填コンクリートと、一部が充填コンクリートの柱頭部に埋設された補強部材とを備えている。鋼管柱の上仕口部及び下仕口部には、鉄骨梁がそれぞれ接合されている。これらの上仕口部及び下仕口部には、上階側内ダイアフラム及び下階側内ダイアフラムがそれぞれ設けられている。補強部材は、鋼管柱の内壁面と間隔を空けた状態で充填コンクリートに埋設されており、上階側内ダイアフラムと上下方向に相対変位可能とされている。 On the other hand, in Patent Document 2, a technique of providing an inner diaphragm at a joint position of a steel frame beam in a concrete-filled steel pipe column is known. The "concrete-filled steel pipe column" of Patent Document 2 includes a steel pipe column, a filled concrete filled in the steel pipe column, and a reinforcing member partially embedded in the stigma of the filled concrete. Steel beams are joined to the upper and lower joints of the steel pipe column. An upper floor side internal diaphragm and a lower floor side internal diaphragm are provided in each of these upper and lower joints. The reinforcing member is embedded in the filled concrete at a distance from the inner wall surface of the steel pipe column, and can be displaced vertically with the inner diaphragm on the upper floor side.

特開２０１３－０７９５１５号公報Japanese Unexamined Patent Publication No. 2013-079515 特開２０１４－０６２３７９号公報Japanese Unexamined Patent Publication No. 2014-06239

特許文献１は、柱の一般部分で鋼管の切断を行い、柱を切断した位置でコンクリートを分断する技術であり、コンクリート断面が一定であるために、当該コンクリートを分断するには、大掛かりな装置で著大な分断力を加える必要がある。またその際に、大きな騒音や振動が発生するという問題があった。 Patent Document 1 is a technique for cutting a steel pipe at a general part of a column and dividing the concrete at the position where the column is cut. Since the concrete cross section is constant, it is a large-scale device for dividing the concrete. It is necessary to add a great division force. At that time, there is a problem that loud noise and vibration are generated.

特許文献２のような内ダイアフラムを有するコンクリート充填鋼管柱であっても、特許文献１の技術を適用する場合には、柱の一般部分での鋼管の切断、コンクリートの分断となり、大掛かりな装置を用い、著大な分断力を加えて解体しなければならなかった。騒音・振動の問題も同様であった。 Even for concrete-filled steel pipe columns having an inner diaphragm as in Patent Document 2, when the technology of Patent Document 1 is applied, the steel pipe is cut at the general part of the column and the concrete is divided, resulting in a large-scale device. It had to be dismantled with a great deal of dividing force. The same was true for noise and vibration problems.

本発明は上記従来の課題に鑑みて創案されたものであって、鉄骨梁と結合される仕口部位置にダイアフラムが接合されたコンクリート充填鋼管柱を対象として、簡易な部材を用い、容易な手順で、加える力も小さくて済むコンクリート充填鋼管柱解体工法を提供することを目的とする。 The present invention has been devised in view of the above-mentioned conventional problems, and is easy to use for a concrete-filled steel pipe column in which a diaphragm is joined at a joint position to be connected to a steel beam by using a simple member. It is an object of the present invention to provide a concrete-filled steel pipe column demolition method that requires a small amount of force to be applied in the procedure.

本発明にかかるコンクリート充填鋼管柱解体工法は、鉄骨梁と結合される仕口部位置に、コンクリートを流通させる貫通孔を有するダイアフラムが接合され、かつ該コンクリートが内部に充填された柱鋼管の柱解体工法であって、上記柱鋼管をその全周に亘って、上記貫通孔位置での上記コンクリートの平断面積がそれ以外の位置での平断面積よりも小さい該ダイヤフラム近傍で、上記ダイアフラムの接合位置を避けて切断して形成した切断部により、ダイアフラム付き柱鋼管部と、該ダイアフラム付き柱鋼管部から分断した分断柱鋼管部とを形成する切断工程と、上記分断柱鋼管部に、上記柱鋼管の高さ方向に沿って、上記ダイアフラムから上記鉄骨梁へわたる梁側部位に面する加力受け部材を接合する接合工程と、上記加力受け部材と上記梁側部位との間に加力手段を設置する設置工程と、上記梁側部位と上記加力受け部材との間で、上記加力手段により、上記切断部を広げるように加力して、上記ダイアフラム周辺の上記コンクリートに引張力を作用させる加力工程とを含むことを特徴とする。 In the concrete-filled steel pipe pillar dismantling method according to the present invention, a pillar having a diaphragm having a through hole for circulating concrete is joined to a joint portion connected to a steel beam, and the pillar is filled with the concrete. It is a dismantling method, and the above-mentioned diaphragm is formed in the vicinity of the diaphragm in which the flat cross-sectional area of the concrete at the through-hole position is smaller than the flat cross-sectional area at other positions over the entire circumference of the pillar steel pipe. The cutting step of forming the column steel pipe portion with a diaphragm and the divided column steel pipe portion separated from the column steel pipe portion with a diaphragm by the cut portion formed by cutting while avoiding the joining position, and the above-mentioned divided column steel pipe portion. A joining step of joining a force receiving member facing the beam side portion extending from the diaphragm to the steel beam along the height direction of the pillar steel pipe, and an application between the force receiving member and the beam side portion. Between the installation process of installing the force means and the beam side portion and the force receiving member, the force is applied so as to widen the cut portion by the force means, and the steel is pulled to the concrete around the diaphragm. It is characterized by including a force step of applying a force.

前記ダイアフラムは、前記柱鋼管内方に設けられ、該柱鋼管内に前記コンクリートを充填するための前記貫通孔を有する内ダイアフラムであることを特徴とする。 The diaphragm is an inner diaphragm provided inside the pillar steel pipe and having the through hole for filling the concrete in the pillar steel pipe.

前記ダイアフラムは、前記鉄骨梁と接合される外縁を有し、前記柱鋼管内方から外方へ突出させて設けられると共に、該柱鋼管内に前記コンクリートを充填するための前記貫通孔を有する通しダイアフラムであることを特徴とする。 The diaphragm has an outer edge to be joined to the steel beam, is provided so as to project outward from the inside of the column steel pipe, and has a through hole for filling the concrete in the column steel pipe. It is characterized by being a diaphragm.

前記加力受け部材には、前記柱鋼管の高さ方向に沿ってネジ孔が形成され、前記加力手段は、前記梁側部位に当接されるように上記ネジ孔に螺合され、ネジ込みにより該梁側部位から該加力受け部材を押圧するネジであることを特徴とする。
前記加力手段は、前記加力受け部材と前記梁側部位との間に設置され、該梁側部位から該加力受け部材を押圧するために伸長されるジャッキであることを特徴とする。 A screw hole is formed in the force receiving member along the height direction of the pillar steel pipe, and the force means is screwed into the screw hole so as to be in contact with the beam side portion and screwed. It is characterized by being a screw that presses the force receiving member from the beam side portion by crowding.
The force receiving means is a jack that is installed between the force receiving member and the beam side portion and is extended from the beam side portion to press the force receiving member.

また、本発明にかかるコンクリート充填鋼管柱解体工法は、鉄骨梁と結合される仕口部位置にダイアフラムが接合され、かつコンクリートが内部に充填された柱鋼管の柱解体工法であって、上記柱鋼管をその全周に亘って、上記ダイアフラムの接合位置を避けて切断して形成した切断部により、ダイアフラム付き柱鋼管部と、該ダイアフラム付き柱鋼管部から分断した分断柱鋼管部とを形成する切断工程と、上記分断柱鋼管部に、上記柱鋼管の高さ方向に沿って、上記ダイアフラムから上記鉄骨梁へわたる梁側部位に面する加力受け部材を接合する接合工程と、上記加力受け部材と上記梁側部位との間に加力手段を設置する設置工程と、上記梁側部位と上記加力受け部材との間で、上記加力手段により、上記切断部を広げるように加力して、上記ダイアフラム周辺の上記コンクリートに引張力を作用させる加力工程とを含み、前記ダイアフラムは、前記鉄骨梁と接合される外縁を有し、前記柱鋼管外方に設けられる外ダイアフラムであり、前記加力受け部材には、前記柱鋼管の高さ方向に沿ってネジ孔が形成され、前記加力手段は、前記梁側部位に当接されるように上記ネジ孔に螺合され、ネジ込みにより該梁側部位から該加力受け部材を押圧するネジであることを特徴とする。
Further, the concrete-filled steel pipe pillar dismantling method according to the present invention is a pillar dismantling method for a pillar steel pipe in which a diaphragm is joined at a joint position to be connected to a steel beam and concrete is filled inside. A column steel pipe portion with a diaphragm and a split column steel pipe portion separated from the beam column steel pipe portion with a diaphragm are formed by a cut portion formed by cutting the steel pipe over the entire circumference while avoiding the joint position of the diaphragm. The cutting step, the joining step of joining the force receiving member facing the beam side portion from the diaphragm to the steel beam along the height direction of the column steel pipe, and the force of the divided column steel pipe portion. The cutting portion is expanded by the force means between the installation process of installing the force means between the receiving member and the beam side portion and the beam side portion and the force receiving member. The diaphragm includes an outer edge joined to the steel beam and is provided on the outer side of the pillar steel pipe by a force step of applying a tensile force to the concrete around the diaphragm. A screw hole is formed in the force receiving member along the height direction of the pillar steel pipe, and the force means is screwed into the screw hole so as to be in contact with the beam side portion. It is a screw that presses the force receiving member from the beam side portion by screwing .

本発明にかかるコンクリート充填鋼管柱解体工法にあっては、鉄骨梁と結合される仕口部位置にダイアフラムが接合されたコンクリート充填鋼管柱を対象として、簡易な部材を用いて、容易な手順で、かつ小さな加力で騒音や振動を抑制しつつ適切にコンクリート充填鋼管柱を解体することができる。 In the concrete-filled steel pipe column demolition method according to the present invention, a simple member is used for a concrete-filled steel pipe column in which a diaphragm is joined at a joint position to be joined to a steel beam, and a simple procedure is performed. Moreover, it is possible to appropriately dismantle concrete-filled steel pipe columns while suppressing noise and vibration with a small force.

本発明にかかるコンクリート充填鋼管柱解体工法が適用される、内ダイヤフラム付きのコンクリート充填鋼管柱の一部破断斜視図である。It is a partially broken perspective view of the concrete-filled steel column with an inner diaphragm to which the concrete-filled steel column dismantling method according to the present invention is applied. 図１に示したコンクリート充填鋼管柱の側断面図である。It is a side sectional view of the concrete-filled steel pipe column shown in FIG. 本発明にかかるコンクリート充填鋼管柱解体工法の好適な一実施形態の切断工程を説明する説明図である。It is explanatory drawing explaining the cutting process of one preferable embodiment of the concrete-filled steel pipe column dismantling method which concerns on this invention. 本発明にかかるコンクリート充填鋼管柱解体工法の好適な一実施形態の接合工程を説明する説明図である。It is explanatory drawing explaining the joining process of one preferable embodiment of the concrete-filled steel pipe column dismantling method which concerns on this invention. 図４の接合工程の完了状態を示す底面図である。It is a bottom view which shows the completion state of the joining process of FIG. 図４の接合工程に用いられる加力受け部材とネジを示す斜視図である。It is a perspective view which shows the force receiving member and a screw used in the joining process of FIG. 本発明にかかるコンクリート充填鋼管柱解体工法の好適な一実施形態の設置工程及び加力工程を説明する説明図である。It is explanatory drawing explaining the installation process and the applying process of one preferable embodiment of the concrete-filled steel pipe column dismantling method which concerns on this invention. 本発明にかかるコンクリート充填鋼管柱解体工法の変形例における設置工程及び加力工程を説明する説明図である。It is explanatory drawing explaining the installation process and the force | force process in the modified example of the concrete-filled steel pipe column dismantling method which concerns on this invention. 本発明にかかるコンクリート充填鋼管柱解体工法の他の変形例における接合工程を説明する説明図である。It is explanatory drawing explaining the joining process in the other modification of the concrete-filled steel pipe column dismantling method which concerns on this invention. 図９の接合工程後の切断工程を説明する説明図である。It is explanatory drawing explaining the cutting process after the joining process of FIG. 本発明にかかるコンクリート充填鋼管柱解体工法の第２実施形態として、通しダイヤフラム付きのコンクリート充填鋼管柱に適用した場合の図７に対応する説明図である。It is explanatory drawing corresponding to FIG. 7 when it was applied to the concrete-filled steel pipe column with a through diaphragm as the 2nd Embodiment of the concrete-filled steel pipe column dismantling method which concerns on this invention. 本発明にかかるコンクリート充填鋼管柱解体工法の第３実施形態として、外ダイヤフラム付きのコンクリート充填鋼管柱に適用した場合の図７に対応する説明図である。It is explanatory drawing corresponding to FIG. 7 when applied to the concrete-filled steel pipe column with an outer diaphragm as the 3rd Embodiment of the concrete-filled steel pipe column dismantling method which concerns on this invention.

以下に、本発明にかかるコンクリート充填鋼管柱解体工法の好適な実施形態を、添付図面を参照して詳細に説明する。図１及び図２には、本発明にかかるコンクリート充填鋼管柱解体工法が適用されるコンクリート充填鋼管柱１の一例が示されている。コンクリート充填鋼管柱１は周知であって、断面多角形や断面円形の中空筒体状の柱鋼管２内部にコンクリート３を充填して、柱部材として用いるものである。 Hereinafter, a preferred embodiment of the concrete-filled steel pipe column dismantling method according to the present invention will be described in detail with reference to the attached drawings. 1 and 2 show an example of a concrete-filled steel pipe column 1 to which the concrete-filled steel pipe column dismantling method according to the present invention is applied. The concrete-filled steel pipe column 1 is well known, and is used as a column member by filling the inside of a hollow tubular column steel pipe 2 having a polygonal cross section or a circular cross section with concrete 3.

コンクリート充填鋼管柱１は、建物架構を構成するために、仕口部位置に、Ｈ形鋼などの鉄骨梁４が結合される。鉄骨梁４は、コンクリート充填鋼管柱１が建物架構内部の柱であれば前後左右の四方から、側柱であれば三方から、隅柱であれば二方から接合される。 In the concrete-filled steel pipe column 1, a steel beam 4 such as H-shaped steel is connected to the joint portion position in order to form a building frame. The steel beam 4 is joined from four sides of the front, back, left and right if the concrete-filled steel pipe column 1 is a column inside the building frame, from three sides if it is a side column, and from two sides if it is a corner column.

このようなコンクリート充填鋼管柱１の中には、柱鋼管２内方の仕口部位置に、鉄骨梁４のフランジ４ａと連続する配置で、鋼製板状部材である内ダイアフラム５が設けられるものがある。図示例では、内ダイアフラム５は上下に２枚設けられている。内ダイアフラム５には、これを上下方向に貫通して、柱鋼管２内部に充填されるコンクリート３をその上下に亘って流通させるための貫通孔６が形成されている。 In such a concrete-filled steel pipe column 1, an inner diaphragm 5 which is a steel plate-like member is provided at a joint portion inside the column steel pipe 2 in a position continuous with the flange 4a of the steel frame beam 4. There is something. In the illustrated example, two inner diaphragms 5 are provided on the upper and lower sides. The inner diaphragm 5 is formed with a through hole 6 that penetrates the inner diaphragm 5 in the vertical direction and allows the concrete 3 filled in the column steel pipe 2 to flow up and down.

貫通孔６の内径ｄはもちろん、これが内設される柱鋼管２の内径Ｄよりも小さく狭められた寸法であり、充填コンクリート３の貫通孔６位置での平断面積は、それ以外の位置での平断面積よりも小さい。 The inner diameter d of the through hole 6 is, of course, a smaller and narrower dimension than the inner diameter D of the column steel pipe 2 to which it is installed, and the flat cross-sectional area at the through hole 6 position of the filled concrete 3 is at other positions. It is smaller than the flat cross-sectional area of.

本実施形態にかかるコンクリート充填鋼管柱解体工法は、このような内ダイアフラム５を有するコンクリート充填鋼管柱１を対象として適用される。図３～図７には、本実施形態にかかるコンクリート充填鋼管柱解体工法の手順が順次示されている。 The concrete-filled steel pipe column dismantling method according to the present embodiment is applied to a concrete-filled steel pipe column 1 having such an inner diaphragm 5. 3 to 7 show sequentially the procedure of the concrete-filled steel pipe column dismantling method according to the present embodiment.

まず、図３に示すように、コンクリート充填鋼管柱１の柱鋼管２をその周方向全周に亘って切断する切断工程を行う。切断工程により、柱鋼管２には、その周方向全周に亘り、切り口となる切断部７が形成される。柱鋼管２の切断は、機械的切断や溶断など、どのような切断方法によってもよい。 First, as shown in FIG. 3, a cutting step is performed in which the pillar steel pipe 2 of the concrete-filled steel pipe pillar 1 is cut over the entire circumference in the circumferential direction. By the cutting step, the column steel pipe 2 is formed with a cutting portion 7 serving as a cut end over the entire circumference in the circumferential direction. The column steel pipe 2 may be cut by any cutting method such as mechanical cutting or fusing.

切断部７の形成位置、すなわち切断を行う位置は、内ダイアフラム５及び鉄骨梁４の接合位置を避けて、かつ当該接合位置の近傍に設定される。詳細には、切断作業を行える限り、できるだけ内ダイアフラム５に近接した位置に切断部７を形成することが望ましい。図示例では、柱高さ方向で、下側の内ダイアフラム５及び鉄骨梁４の下側のフランジ４ａの直下に切断部７が形成されている。 The forming position of the cutting portion 7, that is, the position where the cutting is performed is set in the vicinity of the joining position while avoiding the joining position of the inner diaphragm 5 and the steel frame beam 4. In detail, it is desirable to form the cutting portion 7 at a position as close to the inner diaphragm 5 as possible so that the cutting work can be performed. In the illustrated example, the cut portion 7 is formed directly below the lower inner diaphragm 5 and the lower flange 4a of the steel frame beam 4 in the column height direction.

切断工程によって、コンクリート充填鋼管柱１自体には、鉄骨梁４及び内ダイヤフラム５が接合されたままの状態の上方となるダイアフラム付き柱鋼管部２ａと、ダイアフラム付き柱鋼管部２ａから分断された下方となる分断柱鋼管部２ｂとが、切断部７で分けられて形成される。 By the cutting step, the concrete-filled steel pipe column 1 itself is separated from the column steel pipe portion 2a with a diaphragm, which is above the steel beam 4 and the inner diaphragm 5 in a joined state, and the column steel pipe portion 2a with a diaphragm. The divided column steel pipe portion 2b and the divided column steel pipe portion 2b are formed separately by the cutting portion 7.

次に、図４及び図５に示すように、分断柱鋼管部２ｂに加力受け部材８を接合する接合工程を行う。加力受け部材８は、柱鋼管２の柱高さ方向に沿って、内ダイアフラム５から鉄骨梁４へわたる梁側部位に、図示例では鉄骨梁４の下側のフランジ４ａに下方から面するように、分断柱鋼管部２ｂの外周面から外方へ迫り出すように設けられる。 Next, as shown in FIGS. 4 and 5, a joining step of joining the force receiving member 8 to the divided column steel pipe portion 2b is performed. The force receiving member 8 faces the beam side portion extending from the inner diaphragm 5 to the steel beam 4 along the column height direction of the column steel pipe 2, and faces the lower flange 4a of the steel beam 4 from below in the illustrated example. As described above, it is provided so as to protrude outward from the outer peripheral surface of the divided column steel pipe portion 2b.

本実施形態にあっては、加力受け部材８は、分断柱鋼管部２ｂの外周方向に沿って形成され、分断柱鋼管部２ｂ（コンクリート充填鋼管柱１）の柱幅寸法及び鉄骨梁４の梁幅寸法よりも僅かに狭い長さ寸法を有する断面Ｌ字状の鋼材から構成されている。 In the present embodiment, the force receiving member 8 is formed along the outer peripheral direction of the divided column steel pipe portion 2b, and has the column width dimension of the divided column steel pipe portion 2b (concrete-filled steel pipe column 1) and the steel beam 4. It is composed of a steel material having an L-shaped cross section having a length dimension slightly narrower than the beam width dimension.

加力受け部材８のＬ字状をなす一方の立て板部８ａは、加力受け部材８の長さ方向全長に亘って、分断柱鋼管部２ｂの外周面に、溶接接合等各種接合方法で接合される。加力受け部材８のＬ字状をなす他方の横板部８ｂは、その全面が下側のフランジ４ａを下方から臨むように、当該フランジ４ａ下面から下方へ間隔を隔てて位置される。 One of the L-shaped vertical plate portions 8a of the force receiving member 8 is joined to the outer peripheral surface of the divided column steel pipe portion 2b over the entire length in the length direction of the force receiving member 8 by various joining methods such as welding. Be joined. The other horizontal plate portion 8b having an L-shape of the force receiving member 8 is positioned at a distance downward from the lower surface of the flange 4a so that the entire surface thereof faces the lower flange 4a from below.

次に、図４～図７に示すように、加力受け部材８と鉄骨梁４の下側のフランジ４ａとの間に加力手段を設置する設置工程を行う。本実施形態では、加力手段としてネジ９が示されている。加力受け部材８には、その長さ方向に等間隔を隔てて、複数のネジ９をそれぞれ螺合するための複数のネジ孔８ｃが柱鋼管２の柱高さ方向に沿って貫通形成される。加力受け部材８のネジ孔８ｃに螺合されたネジ９は、鉄骨梁４の下側のフランジ４ａ下面に当接され、これにより、加力手段の設置が完了する。 Next, as shown in FIGS. 4 to 7, an installation step is performed in which the force receiving means is installed between the force receiving member 8 and the lower flange 4a of the steel frame beam 4. In this embodiment, the screw 9 is shown as the force-applying means. A plurality of screw holes 8c for screwing a plurality of screws 9 are formed through the force receiving member 8 along the column height direction of the column steel pipe 2 at equal intervals in the length direction thereof. To. The screw 9 screwed into the screw hole 8c of the force receiving member 8 is brought into contact with the lower surface of the flange 4a on the lower side of the steel frame beam 4, whereby the installation of the force means is completed.

次に、図７に示すように、ネジ９で分断柱鋼管部２ｂに設けた加力受け部材８から鉄骨梁４に加力する加力工程を行う。加力工程を実施する前のいずれかの時点で、切断部７の形成位置に露出されるコンクリート箇所に対して、予め切り欠きを入れるなど、劈開を助ける処置を行っておいても良い。鉄骨梁４の下側のフランジ４ａに当接させたネジ９をネジ込むと、分断柱鋼管部２ｂの外周面を支持面として、鉄骨梁４は、柱高さ方向上方へ向けて押圧される。 Next, as shown in FIG. 7, a force step of applying a force to the steel frame beam 4 from the force receiving member 8 provided in the divided column steel pipe portion 2b with the screw 9 is performed. At any time before the applying step, measures may be taken to assist cleavage, such as making a notch in advance in the concrete portion exposed at the forming position of the cut portion 7. When the screw 9 in contact with the lower flange 4a of the steel frame beam 4 is screwed in, the steel frame beam 4 is pressed upward in the column height direction with the outer peripheral surface of the divided column steel pipe portion 2b as the support surface. ..

加力受け部材８は分断柱鋼管部２ｂに接合されており、鉄骨梁４はダイアフラム付き柱鋼管部２ａと一体であり、これらダイアフラム付き柱鋼管部２ａと分断柱鋼管部２ｂとの間には、内ダイアフラム５近傍の切断部７で柱鋼管２が切断されているため、下側のフランジ４ａと加力受け部材８との間でネジ９により、この切断部７を広げるように当該ネジ９をネジ込み、このネジ込みによる加力で鉄骨梁４を押圧すると、内ダイアフラム５周辺のコンクリート３には引張力が作用し、この引張力でコンクリート３を劈開、すなわちコンクリート３に割りを生じさせて、コンクリート充填鋼管柱１をコンクリート３ごと分断して、解体することができる。 The force receiving member 8 is joined to the divided column steel pipe portion 2b, and the steel beam 4 is integrated with the column steel pipe portion 2a with a diaphragm, and between these the column steel pipe portion 2a with a diaphragm and the divided column steel pipe portion 2b. Since the column steel pipe 2 is cut at the cut portion 7 near the inner diaphragm 5, the screw 9 is used to widen the cut portion 7 between the lower flange 4a and the force receiving member 8 by the screw 9. When the steel beam 4 is pressed by the force of this screwing, a tensile force acts on the concrete 3 around the inner diaphragm 5, and this tensile force opens the concrete 3, that is, causes the concrete 3 to crack. The concrete-filled steel pipe column 1 can be separated together with the concrete 3 and disassembled.

本実施形態にかかるコンクリート充填鋼管柱解体工法でコンクリート３に劈開を生じさせる切断部７は、貫通孔６で上下方向に貫通する内ダイアフラム５近傍であり、この切断部７の位置は、コンクリート３の平断面積が他の部分よりも狭いので、特許文献１に比し、小さな加力で、低騒音・低振動で、コンクリート充填鋼管柱１を解体することができる。 The cut portion 7 that causes the concrete 3 to open in the concrete-filled steel pipe column dismantling method according to the present embodiment is in the vicinity of the inner diaphragm 5 that penetrates in the vertical direction through the through hole 6, and the position of the cut portion 7 is the concrete 3. Since the flat cross-sectional area of the concrete-filled steel pipe column 1 is narrower than that of other parts, the concrete-filled steel pipe column 1 can be disassembled with a small force, low noise and low vibration as compared with Patent Document 1.

また、切断手法としてワイヤソーの使用が考えられるが、ワイヤーソーでは、粉塵発生や切断部での発熱があり、これを抑えるために水処理を要するという煩雑さがあるが、本実施形態では、そのような手間を省いて施工することができる。 In addition, the use of a wire saw can be considered as a cutting method, but the wire saw has the complexity of generating dust and generating heat at the cutting portion, and water treatment is required to suppress this. It can be constructed without such trouble.

また、本実施形態では、内ダイアフラム５付近の切断部７近傍において、分断柱鋼管部２ｂに接合した加力受け部材８と鉄骨梁４の下側のフランジ４ａとの間で、分断柱鋼管部２ｂの外周面を支持面として加力するようにしたので、大掛かりな装置を用いることなく、ネジ９などの小型の加力手段で的確にコンクリート３を劈開することができる。 Further, in the present embodiment, in the vicinity of the cut portion 7 near the inner diaphragm 5, the divided column steel pipe portion is between the force receiving member 8 joined to the divided column steel pipe portion 2b and the lower flange 4a of the steel frame beam 4. Since the outer peripheral surface of 2b is applied as a support surface, the concrete 3 can be accurately opened by a small force means such as a screw 9 without using a large-scale device.

また、本実施形態では、ネジ９と加力受け部材８という簡易な部材により、そしてまた、加力受け部材８の分断柱鋼管部２ｂへの接合及びネジ９のネジ込みという容易な手順でスムーズにコンクリート充填鋼管柱１を解体することができる。ネジ９のネジ込みにより加力するので、ゆっくりと加力することができ、コンクリート３の劈開を徐々に進行させることができて、作業安全性を高く確保することができる。 Further, in the present embodiment, a simple member of the screw 9 and the force receiving member 8 is used, and the force receiving member 8 is smoothly joined to the divided column steel pipe portion 2b and the screw 9 is screwed in smoothly. The concrete-filled steel pipe column 1 can be disassembled. Since the force is applied by screwing in the screw 9, the force can be applied slowly, the cleavage of the concrete 3 can be gradually advanced, and the work safety can be ensured high.

さらに、柱鋼管２の内部に、柱高さ方向にコンクリート３が充填されるコンクリート充填鋼管柱１では、内ダイアフラム５の下方側におけるコンクリート充填度合いが、上方側ほど高くなく、内ダイヤフラム５の下面に対するコンクリート３の付着は弱い。本実施形態では、引張力を加えて劈開する切断部７を、下側の内ダイアフラム５の下側に形成するようにしているので、コンクリート充填鋼管柱１をさらに円滑に分断して、解体することができる。 Further, in the concrete-filled steel pipe column 1 in which the concrete 3 is filled inside the column steel pipe 2 in the column height direction, the degree of concrete filling on the lower side of the inner diaphragm 5 is not as high as on the upper side, and the lower surface of the inner diaphragm 5 is filled. The adhesion of concrete 3 to the concrete 3 is weak. In the present embodiment, since the cut portion 7 to be cleaved by applying a tensile force is formed on the lower side of the inner diaphragm 5 on the lower side, the concrete-filled steel pipe column 1 is further smoothly divided and disassembled. be able to.

図８には、上記実施形態の変形例が示されている。この変形例では、加力手段について、ネジ９に代えて、加力受け部材８と鉄骨梁４の下側のフランジ４ａとの間に、加力受け部材８から鉄骨梁４を押圧するために伸長されるジャッキ１０が示されている。 FIG. 8 shows a modified example of the above embodiment. In this modification, the force receiving means is used to press the steel frame beam 4 from the force receiving member 8 between the force receiving member 8 and the lower flange 4a of the steel frame beam 4 instead of the screw 9. The jack 10 to be extended is shown.

ジャッキ１０は、加力受け部材８の横板部８ｂに、下側のフランジ４ａ下に臨ませて設置される。加力受け部材８にネジ孔８ｃを形成する必要はない。ジャッキ１０を伸長させることで、ネジ９をネジ込むことと同様に、内ダイアフラム５周辺のコンクリート３に引張力を生じさせて、コンクリート３を劈開することができる。 The jack 10 is installed on the horizontal plate portion 8b of the force receiving member 8 so as to face the lower flange 4a. It is not necessary to form the screw hole 8c in the force receiving member 8. By extending the jack 10, a tensile force is generated in the concrete 3 around the inner diaphragm 5 in the same manner as when the screw 9 is screwed in, so that the concrete 3 can be cleaved.

この変形例では、ジャッキ１０と加力受け部材８という簡易な部材により、そしてまた、加力受け部材８の分断柱鋼管部２ｂへの接合及びジャッキアップという容易な手順でスムーズにコンクリート充填鋼管柱１を解体することができ、上記実施形態と同様の作用効果を奏することができる。 In this modification, the concrete-filled steel pipe column can be smoothly smoothed by a simple member of the jack 10 and the force receiving member 8, and also by the simple procedure of joining the force receiving member 8 to the split column steel pipe portion 2b and jacking up. 1 can be disassembled, and the same action and effect as those of the above embodiment can be obtained.

図９及び図１０には、上記実施形態の他の変形例が示されている。上記実施形態では、切断工程の後に、接合工程を行う場合を例示したが、柱鋼管２に切断部７を形成する切断作業に支障がなければ、予め、鉄骨梁４から間隔を隔てた位置に加力受け部材８を接合する接合工程を行い、その後、加力受け部材８と鉄骨梁４との間で柱鋼管２を切断して切断部７を形成する切断工程を行うようにしてもよい。 9 and 10 show other modifications of the above embodiment. In the above embodiment, the case where the joining step is performed after the cutting step is illustrated, but if there is no problem in the cutting work for forming the cut portion 7 in the column steel pipe 2, the position is separated from the steel frame beam 4 in advance. A joining step of joining the force receiving member 8 may be performed, and then a cutting step of cutting the column steel pipe 2 between the force receiving member 8 and the steel frame beam 4 to form the cut portion 7 may be performed. ..

また、この変形例では、切断部７が、柱高さ方向で、上側の内ダイアフラム５及び鉄骨梁４の上側のフランジ４ａの直上に形成されていて、当該切断部７によって、ダイアフラム付き柱鋼管部２ａが下方に、分断柱鋼管部２ｂが上方となるように分けられ、加力受け部材８は、梁側部位となる鉄骨梁４の上側のフランジ４ａに上方から面するように、分断柱鋼管部２ｂの外周面から外方へ迫り出すように設けられ、そして、鉄骨梁４の上側のフランジ４ａに当接させたネジ９をネジ込むと、当該上側のフランジ４ａを支持面として、分断柱鋼管部２ｂが柱高さ方向上方へ向けて押圧されるようになっている。 Further, in this modification, the cut portion 7 is formed in the column height direction directly above the upper inner diaphragm 5 and the upper flange 4a of the steel beam 4, and the cut portion 7 forms a column steel pipe with a diaphragm. The section 2a is divided so that the section 2a is on the lower side and the section column steel pipe section 2b is on the upper side, and the force receiving member 8 faces the upper flange 4a of the steel beam 4 which is the beam side portion from above. When a screw 9 which is provided so as to protrude outward from the outer peripheral surface of the steel pipe portion 2b and is brought into contact with the upper flange 4a of the steel beam 4 is screwed in, the upper flange 4a is used as a support surface to divide the steel pipe portion 2b. The column steel pipe portion 2b is pressed upward in the column height direction.

このような変形例であっても、上記実施形態と同様の作用効果を奏することはもちろんである。 Of course, even in such a modified example, the same action and effect as those of the above-described embodiment can be obtained.

図１１には、本発明にかかるコンクリート充填鋼管柱解体工法の第２実施形態として、通しダイヤフラム５付きのコンクリート充填鋼管柱１に適用した場合が示されている。 FIG. 11 shows a case where the concrete-filled steel pipe column 1 with the through diaphragm 5 is applied as the second embodiment of the concrete-filled steel pipe column dismantling method according to the present invention.

通しダイヤフラム５も従来周知であって、鉄骨梁４と接合される外縁５ａを有し、柱鋼管２内方から外方へ突出させて設けられると共に、柱鋼管２内にコンクリート３を充填するための貫通孔６を有するものである。通しダイヤフラム５は、例えばＨ形鋼製の鉄骨梁４の上下のフランジ４ａの位置に合わせて、柱鋼管２を分断するように配設され、当該柱鋼管２に溶接接合等されて設けられる。 The through diaphragm 5 is also well known in the past, and has an outer edge 5a to be joined to the steel frame beam 4, is provided so as to project from the inside to the outside of the column steel pipe 2, and is provided to fill the column steel pipe 2 with concrete 3. It has a through hole 6 of. The through diaphragm 5 is arranged so as to divide the column steel pipe 2 in accordance with the positions of the upper and lower flanges 4a of the steel frame beam 4 made of H-shaped steel, and is provided by welding to the column steel pipe 2.

通しダイヤフラム５の場合、外周側が柱鋼管２外方に突出され、この外周側の外縁５ａに鉄骨梁４のフランジ４ａが接合されることから、分断柱鋼管部２ｂに設けられる加力受け部材８は、通しダイアフラム５から鉄骨梁４のフランジ４ａにわたる梁側部位のいずれかの箇所に対し、柱高さ方向から面するようになっている。 In the case of the through diaphragm 5, the outer peripheral side is projected to the outside of the column steel pipe 2, and the flange 4a of the steel beam 4 is joined to the outer edge 5a on the outer peripheral side. Is adapted to face any part of the beam side portion extending from the through diaphragm 5 to the flange 4a of the steel beam 4 from the column height direction.

図示例にあっては、加力受け部材８は、梁側部位として、下側の通しダイアフラム５の下面に面して設けられている。フランジ４ａの下面に面して設けても良いことはもちろんである。 In the illustrated example, the force receiving member 8 is provided as a beam side portion facing the lower surface of the lower through diaphragm 5. Of course, it may be provided so as to face the lower surface of the flange 4a.

第２実施形態にあっても、ネジ９をネジ込むことによって、ダイアフラム付き鋼管部２ａを押し上げ、これにより、コンクリート充填鋼管柱１が分断され、解体されるようになっている。第２実施形態にあっても、上記実施形態と同様の作用効果を奏することはもちろんである。 Even in the second embodiment, the screw 9 is screwed in to push up the steel pipe portion 2a with a diaphragm, whereby the concrete-filled steel pipe column 1 is divided and disassembled. Of course, even in the second embodiment, the same action and effect as those in the above embodiment can be obtained.

図１２には、本発明にかかるコンクリート充填鋼管柱解体工法の第３実施形態として、外ダイヤフラム５付きのコンクリート充填鋼管柱１に適用した場合が示されている。 FIG. 12 shows a case where the concrete-filled steel pipe column 1 with the outer diaphragm 5 is applied as the third embodiment of the concrete-filled steel pipe column dismantling method according to the present invention.

第３実施形態は、上記実施形態がダイアフラム５の位置とそれ以外の位置とにおける平断面積の広狭を利用していると異なり、コンクリート３の引張強度が低いことのみを利用したものである。 The third embodiment utilizes only the low tensile strength of the concrete 3 unlike the above-described embodiment in which the wide and narrow of the flat cross-sectional area at the position of the diaphragm 5 and the position other than the diaphragm 5 is used.

外ダイヤフラム５も従来周知であって、鉄骨梁４と接合される外縁５ａを有し、柱鋼管２外方に設けられるものである。外ダイヤフラム５は、上記内ダイアフラム５や通しダイアフラム５と同様に鉄骨梁４の上下のフランジ４ａの位置に合わせて、柱鋼管２の外周面に溶接接合等されて設けられる。 The outer diaphragm 5 is also well known in the past, and has an outer edge 5a joined to the steel frame beam 4 and is provided on the outer side of the column steel pipe 2. The outer diaphragm 5 is provided by being welded to the outer peripheral surface of the column steel pipe 2 in accordance with the positions of the upper and lower flanges 4a of the steel frame beam 4 in the same manner as the inner diaphragm 5 and the through diaphragm 5.

外ダイヤフラム５の場合、その外縁５ａに鉄骨梁４のフランジ４ａが接合されることから、分断柱鋼管部２ｂに設けられる加力受け部材８は、第２実施形態と同様に、外ダイアフラム５から鉄骨梁４のフランジ４ａにわたる梁側部位のいずれかの箇所に対し、柱高さ方向から面するようになっている。 In the case of the outer diaphragm 5, since the flange 4a of the steel frame beam 4 is joined to the outer edge 5a, the force receiving member 8 provided in the divided column steel pipe portion 2b is from the outer diaphragm 5 as in the second embodiment. It faces any part of the beam side portion of the steel frame beam 4 over the flange 4a from the column height direction.

図示例にあっては、加力受け部材８は、梁側部位として、下側の外ダイアフラム５の下面に面して設けられている。フランジ４ａの下面に面して設けても良いことはもちろんである。 In the illustrated example, the force receiving member 8 is provided as a beam side portion facing the lower surface of the lower outer diaphragm 5. Of course, it may be provided so as to face the lower surface of the flange 4a.

第３実施形態にあっても、ネジ９をネジ込むことによって、ダイアフラム付き鋼管部２ａを押し上げ、これにより、コンクリート充填鋼管柱１が分断され、解体されるようになっている。 Even in the third embodiment, the screw 9 is screwed in to push up the steel pipe portion 2a with a diaphragm, whereby the concrete-filled steel pipe column 1 is divided and disassembled.

第３実施形態の場合、加力工程を実施する前のいずれかの時点で、切断部７の形成位置に露出されるコンクリート箇所に対して、予め切り欠きを入れるなど、劈開を助ける処置を行っておくことが望ましい。第３実施形態にあっても、加力の大きさは大きくする必要があるが、上記実施形態と同様の作用効果を奏することはもちろんである。 In the case of the third embodiment, measures are taken to assist cleavage, such as making a notch in advance in the concrete portion exposed at the formation position of the cut portion 7 at any time before the applying step. It is desirable to keep it. Even in the third embodiment, it is necessary to increase the magnitude of the applied force, but it goes without saying that the same action and effect as those of the above-described embodiment can be obtained.

１コンクリート充填鋼管柱
２柱鋼管
２ａダイアフラム付き鋼管部
２ｂ分断柱鋼管部
３コンクリート
４鉄骨梁
４ａフランジ
５内ダイアフラム、通しダイヤフラム、外ダイアフラム
５ａ外縁
６貫通孔
７切断部
８加力受け部材
８ｃネジ孔
９ネジ
１０ジャッキ 1 Concrete-filled steel pipe pillar 2 Pillar steel pipe 2a Steel pipe with diaphragm 2b Divided pillar steel pipe 3 Concrete 4 Steel beam 4a Flange 5 Inner diaphragm, through diaphragm, outer diaphragm 5a Outer edge 6 Through hole 7 Cut part 8 Force receiving member 8c Screw hole 9 screw 10 jack

Claims

This is a column demolition method for column steel pipes in which a diaphragm having a through hole for circulating concrete is joined to the position of the joint to be connected to the steel beam and the concrete is filled inside.
The column steel pipe is cut over the entire circumference in the vicinity of the diaphragm in which the flat cross-sectional area of the concrete at the through hole position is smaller than the flat cross-sectional area at other positions, avoiding the joint position of the diaphragm. A cutting step of forming a column steel pipe portion with a diaphragm and a divided column steel pipe portion separated from the column steel pipe portion with a diaphragm by the cut portion formed in the above process.
A joining step of joining a force receiving member facing the beam side portion from the diaphragm to the steel frame beam along the height direction of the column steel pipe to the divided column steel pipe portion.
The installation process of installing the force means between the force receiving member and the beam side portion,
Between the beam side portion and the force receiving member, a force is applied by the force means so as to widen the cut portion, and a force is applied to the concrete around the diaphragm. A concrete-filled steel pipe column demolition method characterized by including.

The concrete-filled steel pipe column dismantling according to claim 1, wherein the diaphragm is an inner diaphragm provided inside the pillar steel pipe and having the through hole for filling the concrete in the pillar steel pipe. Construction method.

The diaphragm has an outer edge to be joined to the steel beam, is provided so as to project outward from the inside of the column steel pipe, and has a through hole for filling the concrete in the column steel pipe. The concrete-filled steel pipe column dismantling method according to claim 1, wherein the diaphragm is used.

A screw hole is formed in the force receiving member along the height direction of the pillar steel pipe, and the force means is screwed into the screw hole so as to be in contact with the beam side portion and screwed. The concrete-filled steel pipe column dismantling method according to any one of claims 1 to 3 , wherein the screw presses the force receiving member from the beam side portion by crowding.

The claim means is a jack that is installed between the force receiving member and the beam side portion and is extended from the beam side portion to press the force receiving member. Item 5. The concrete-filled steel pipe column demolition method according to any one of Items 1 to 3 .

This is a column demolition method for column steel pipes in which a diaphragm is joined to the joint where it is connected to a steel beam and concrete is filled inside.
The column steel pipe portion with a diaphragm and the divided column steel pipe portion separated from the column steel pipe portion with a diaphragm are separated by a cut portion formed by cutting the column steel pipe over the entire circumference while avoiding the joint position of the diaphragm. The cutting process to form and
A joining step of joining a force receiving member facing the beam side portion from the diaphragm to the steel frame beam along the height direction of the column steel pipe to the divided column steel pipe portion.
The installation process of installing the force means between the force receiving member and the beam side portion,
Between the beam side portion and the force receiving member, a force is applied by the force means so as to widen the cut portion, and a force is applied to the concrete around the diaphragm. Including,
The diaphragm has an outer edge joined to the steel beam, and is an outer diaphragm provided on the outer side of the column steel pipe.
A screw hole is formed in the force receiving member along the height direction of the column steel pipe, and the force means is screwed into the screw hole so as to be in contact with the beam side portion and screwed. A concrete-filled steel pipe column dismantling method, characterized in that it is a screw that presses the force receiving member from the beam side portion by crowding .