JP2013189782A - Earthquake strengthening structure of concrete building - Google Patents

Earthquake strengthening structure of concrete building Download PDF

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JP2013189782A
JP2013189782A JP2012055708A JP2012055708A JP2013189782A JP 2013189782 A JP2013189782 A JP 2013189782A JP 2012055708 A JP2012055708 A JP 2012055708A JP 2012055708 A JP2012055708 A JP 2012055708A JP 2013189782 A JP2013189782 A JP 2013189782A
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steel plate
concrete
grout
outer diameter
seismic reinforcement
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JP6000581B2 (en
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Harukatsu Kadoya
治克 角屋
Satoshi Murayama
聡 村山
Yoshiteru Maruyama
喜照 丸山
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Okabe Co Ltd
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Okabe Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To provide an earthquake strengthening structure of a concrete building, capable of facilitating attachment when attaching a steel plate to a concrete skeleton even when the steel plate is deflected or respective anchors are shifted from prescribed positions and fixed respectively or fixed in a tilted state firstly, solidly distributing grout between the concrete skeleton and the steel plate further secondly, and allowing easy visual confirmation of a distribution state of the grout thirdly.SOLUTION: To a plurality of anchors 11 fixed to an RC skeleton 1, through-holes 21 of a steel plate 2 having the plurality of through-holes 21 whose inner diameter is larger than an outer diameter of the anchor 11 are inserted, nuts 4 are fastened from the top of them through washers 3, and grout 5 is filled between a front surface of the RC skeleton 1 and a back surface of the steel plate 2. Also, on the back surface of the steel plate 2, long-length spacers in a vertical direction and a horizontal direction may be provided. Also, the washer 3 may be provided with a notched part projected more than the outer diameter of the nut 4.

Description

本発明は、鉄筋コンクリート（ＲＣ）躯体などのコンクリート躯体をアンカーと鋼板によって耐震補強するコンクリート建造物の耐震補強構造に関する。   The present invention relates to a seismic reinforcement structure for a concrete building in which a concrete frame such as a reinforced concrete (RC) frame is seismically reinforced with an anchor and a steel plate.

従来のコンクリート建造物の耐震補強構造として、例えば、コンクリート躯体をアンカーと鋼板によって耐震補強する構造が提案されている（例えば、特許文献１〜３参照。）。   As a conventional seismic reinforcement structure for a concrete building, for example, a structure in which a concrete frame is seismically reinforced with an anchor and a steel plate has been proposed (see, for example, Patent Documents 1 to 3).

特開平１１−３２４３３７号公報JP-A-11-324337 特開平１０−２１９９２９号公報Japanese Patent Application Laid-Open No. 10-219929 特開平１０−２０５１３４号公報JP-A-10-205134

しかし、上述の特許文献１〜３に記載された従来のコンクリート建造物の耐震補強構造では、コンクリート躯体を大きな鋼板で覆って補強するため、鋼板の面積が大きくなる程、その重量が嵩むと共に、その全長も長くなるため、鋼板を吊り上げた際に鋼板が撓んでしまう。また、各アンカーは、それぞれコンクリート躯体の所定位置からずれて固定されたり、その躯体面に対して傾いた状態で固定される。これらのことより、鋼板をコンクリート躯体の所定位置に取り付ける際の作業性が悪いという問題がある。そのため、鋼板を複数枚に小さく分割して施工することも考えられるが、鋼板同士の境界部分のシーリングや接合などの作業が増えて、それだけ作業時間が嵩むという新たな問題が生じる。   However, in the seismic reinforcement structure of the conventional concrete building described in Patent Documents 1 to 3 described above, the concrete frame is covered with a large steel plate and reinforced, so that the larger the area of the steel plate, the greater the weight, Since the overall length is also long, the steel plate is bent when the steel plate is lifted. In addition, each anchor is fixed while being displaced from a predetermined position of the concrete frame, or is fixed in a state of being inclined with respect to the surface of the frame. From these things, there exists a problem that workability | operativity at the time of attaching a steel plate to the predetermined position of a concrete frame is bad. For this reason, it is conceivable to divide the steel plate into a plurality of pieces, but there is a new problem that the work such as sealing and joining at the boundary between the steel plates increases and the work time increases accordingly.

また、コンクリート躯体と鋼板との間には、空間を形成し、グラウト（モルタル）をその空間全体に亘って充填させることで一体化を図るが、コンクリート躯体と鋼板との間隔が大きくなるほど、またコンクリート躯体の高さが高いほど、グラウトを充填する容積が大きくなるので、グラウトは注入後から直ぐに固化し始めることを考慮すると、グラウトが空間全体に密実に行き渡らないことが懸念されると共に、その確認が困難であるという問題もある。   In addition, a space is formed between the concrete frame and the steel plate, and integration is achieved by filling grout (mortar) over the entire space. However, as the interval between the concrete frame and the steel plate increases, As the height of the concrete frame increases, the volume that fills the grout increases.Therefore, considering that the grout starts to solidify immediately after pouring, there is a concern that the grout will not spread throughout the entire space. There is also a problem that confirmation is difficult.

そこで、本発明は、このような問題点に着目してなされたもので、第１には鋼板をコンクリート躯体に取り付ける際に鋼板が撓んでも、また、各アンカーがそれぞれ所定位置からずれて固定されたり、傾いた状態で固定されたとしても、容易に取り付けることができ、第２には、さらにコンクリート躯体と鋼板との間にグラウトを密実に行き渡せることができ、第３にはグラウトの行き渡り状態を簡単に目視で確認することができるコンクリート建造物の耐震補強構造を提供することを目的とする。   Therefore, the present invention has been made paying attention to such problems. First, even when the steel plate is bent when the steel plate is attached to the concrete frame, each anchor is fixed and shifted from a predetermined position. Can be easily installed, even if it is fixed or tilted, and secondly, the grout can be more densely distributed between the concrete frame and the steel plate, and thirdly the grout An object of the present invention is to provide a seismic reinforcement structure for a concrete building which can easily visually check the spread state.

上記目的を達成するため、本発明に係るコンクリート建造物の耐震補強構造は、コンクリート躯体に固定した複数のアンカーに、そのアンカーの外径より内径が過大な複数の貫通孔を有する鋼板の該貫通孔を通しその上からナットにより締付け、コンクリート躯体の表面と鋼板の裏面との間にグラウトを充填したことを特徴とする。
ここで、鋼板の裏面には、その鋼板の左右両側とその左右両側の間に所定間隔で鉛直方向に延びる鉛直方向長尺スペーサを設けると共に、その鋼板の下側に水平方向に延びる水平方向長尺スペーサを設けても良い。
また、ナットと鋼板との間には、座金を使用し、その座金には、ナットの外径よりも突出して鋼板の貫通孔に連通する切り欠き部を設けると良い。 In order to achieve the above object, a seismic reinforcement structure for a concrete building according to the present invention includes a steel plate having a plurality of anchors fixed to a concrete frame and having a plurality of through holes whose inner diameter is larger than the outer diameter of the anchor. It is characterized in that a grout is filled between the surface of the concrete frame and the back surface of the steel plate through a hole and tightening with a nut from above.
Here, on the back surface of the steel plate, a vertical long spacer extending in the vertical direction at a predetermined interval is provided between the left and right sides of the steel plate and the left and right sides, and the horizontal length extending in the horizontal direction below the steel plate. A scale spacer may be provided.
Further, a washer is used between the nut and the steel plate, and the washer is preferably provided with a notch that protrudes from the outer diameter of the nut and communicates with the through hole of the steel plate.

本発明に係るコンクリート建造物の耐震補強構造によれば、コンクリート躯体に取り付ける鋼板には、アンカーの外径より内径が過大な複数の貫通孔が形成されているので、鋼板をコンクリート躯体に取り付ける際に鋼板が撓んでも容易に取り付けることができる。また、鋼板の裏面には鉛直方向長尺スペーサと水平方向長尺スペーサを設けた場合には、そのスペーサが鋼板の補強の役割を果たし、鋼板の撓みを減少させることができると共に、グラウトを充填する空間が区切られるため、コンクリート躯体と鋼板との間にグラウトを密実に行き渡せることができる。さらに、ナットと鋼板との間の座金に鋼板の貫通孔に連通する切り欠き部を設けた場合には、そのグラウトの行き渡り状態を簡単に目視で確認することができる。   According to the seismic reinforcement structure for a concrete building according to the present invention, a plurality of through holes whose inner diameter is larger than the outer diameter of the anchor are formed in the steel plate to be attached to the concrete case. Even if the steel plate is bent, it can be easily attached. In addition, when a vertical long spacer and a horizontal long spacer are provided on the back of the steel plate, the spacer serves to reinforce the steel plate and can reduce the bending of the steel plate and fill the grout. Since the space to be cut is divided, the grout can be distributed densely between the concrete frame and the steel plate. Furthermore, when the notch part connected to the through-hole of a steel plate is provided in the washer between a nut and a steel plate, the spread state of the grout can be easily confirmed visually.

本発明に係るコンクリート建造物の耐震補強構造の平面図、要部拡大平面図である。It is a top view of a seismic reinforcement structure of a concrete building concerning the present invention, and an important section enlarged plan view. 本発明に係るコンクリート建造物の耐震補強構造の断面図、要部拡大断面図である。It is sectional drawing of the earthquake-proof reinforcement structure of the concrete building which concerns on this invention, and principal part expanded sectional drawing. 鋼板の裏面側に長尺スペーサを設けた場合の背面図、Ａ−Ａ線断面図である。It is a rear view at the time of providing a long spacer in the back surface side of a steel plate, and an AA sectional view. 切り欠き部を設けた座金の平面図、断面図、ナット装着状態を示す平面図である。It is a top view of a washer which provided a notch part, a sectional view, and a top view showing a nut mounting state.

次に、本発明に係るコンクリート建造物の耐震補強構造の実施形態について図面を参照して説明する。   Next, an embodiment of a seismic reinforcement structure for a concrete building according to the present invention will be described with reference to the drawings.

このコンクリート建造物の耐震補強構造では、図１（ａ），（ｂ）に示すように、鉄筋コンクリート製のＲＣ躯体に固定されたアンカー１１の外径より内径が過大な複数の貫通孔２１を有する鋼板２を使用してＲＣ躯体を耐震補強する。具体的には、図２（ａ），（ｂ）の断面図および要部拡大断面図に示すように、ＲＣ躯体１にあと施工アンカー等の各アンカー１１を、頭部を突出させて固定し、その各アンカー１１の頭部に鋼板２の各貫通孔２１を通して、その上から座金３を介してナット４により締付ける。その際、ＲＣ躯体１の表面と、鋼板２の裏面との間に空間を設ける。そして、その空間にグラウト５を充填する。すると、図２（ｂ）に示すように、ＲＣ躯体１と鋼板２との間の空間に充填したグラウト５が過大孔である鋼板２の貫通孔２１の内部にも充填されて硬化するので、ＲＣ躯体１と鋼板２とアンカー１１と座金３とをさらに一体化させる。   As shown in FIGS. 1 (a) and 1 (b), the seismic reinforcement structure for a concrete building has a plurality of through holes 21 whose inner diameter is larger than the outer diameter of the anchor 11 fixed to the RC frame made of reinforced concrete. Seismic reinforcement of RC frame using steel plate 2. Specifically, as shown in the cross-sectional views and enlarged cross-sectional views of FIGS. 2A and 2B, each anchor 11 such as a post-construction anchor is fixed to the RC housing 1 with the head protruding. The through holes 21 of the steel plate 2 are passed through the heads of the anchors 11 and tightened with nuts 4 through the washers 3 from above. At that time, a space is provided between the surface of the RC housing 1 and the back surface of the steel plate 2. Then, the grout 5 is filled in the space. Then, as shown in FIG. 2 (b), the grout 5 filled in the space between the RC housing 1 and the steel plate 2 is also filled into the through hole 21 of the steel plate 2 which is an excessive hole and hardens. The RC housing 1, the steel plate 2, the anchor 11 and the washer 3 are further integrated.

このように、この耐震補強構造によれば、ＲＣ躯体１に取り付ける鋼板２には、アンカー１１の外径より内径が過大な複数の貫通孔２１が形成されているので、鋼板２１をＲＣ躯体１に取り付ける際に鋼板２が撓んでいても、また、各アンカーがそれぞれ所定位置からずれて固定されたり、傾いた状態で固定されたとしても、容易に取り付けることができ、作業性が向上する。また、鋼板２の貫通孔２１は、アンカー１１の外径より大きい過大孔であり、ＲＣ躯体１と鋼板２との間の空間に充填したグラウト５がその貫通孔２１の内部にも充填され、ＲＣ躯体１と鋼板２とアンカー１１と座金３とを一体化させるので、より強固に耐震補強できる。   Thus, according to this seismic reinforcement structure, the steel plate 2 attached to the RC housing 1 is formed with the plurality of through holes 21 whose inner diameter is larger than the outer diameter of the anchor 11. Even when the steel plate 2 is bent at the time of attachment to each other, or even if each anchor is fixed and shifted from a predetermined position, or is fixed in an inclined state, it can be attached easily and workability is improved. Further, the through hole 21 of the steel plate 2 is an excessive hole larger than the outer diameter of the anchor 11, and the grout 5 filled in the space between the RC housing 1 and the steel plate 2 is also filled in the through hole 21. Since the RC housing 1, the steel plate 2, the anchor 11, and the washer 3 are integrated, seismic reinforcement can be performed more firmly.

なお、以上の説明では、ＲＣ躯体１と鋼板２との間に空間を設けるための方法について具体的に説明しなかったが、例えば、図３（ａ），（ｂ）に示すように、鋼板２の裏面に、水平方向に所定間隔で鉛直方向に延びる鉛直方向長尺スペーサ２２を設けると共に、その鋼板２の下側に水平方向に延びる水平方向長尺スペーサ２３を設けるようにすると良い。このようにすると、長尺スペーサ２２，２３によりＲＣ躯体１と鋼板２との間の空間を簡単かつ確実に確保できると共に、その長尺スペーサ２２，２３が鋼板２の補強材の役割を果たし、鋼板２を大型化させても、鋼板２の撓みを減少させることができ、作業性が向上する。また、水平方向に所定間隔で設けた鉛直方向長尺スペーサ２２がＲＣ躯体１と鋼板２との間の空間を区分けすると共に、下方から水平方向長尺スペーサ２３がその空間を塞ぐので、ＲＣ躯体１と鋼板２との間にグラウト５を密実に行き渡せることができる。   In the above description, a method for providing a space between the RC housing 1 and the steel plate 2 has not been specifically described. For example, as shown in FIGS. It is preferable that a vertical long spacer 22 extending in the vertical direction at a predetermined interval in the horizontal direction is provided on the rear surface of 2, and a horizontal long spacer 23 extending in the horizontal direction is provided below the steel plate 2. If it does in this way, while the space between RC housing 1 and the steel plate 2 can be ensured easily and reliably by the long spacers 22 and 23, the long spacers 22 and 23 serve as a reinforcing material for the steel plate 2, Even if the steel plate 2 is enlarged, the bending of the steel plate 2 can be reduced, and workability is improved. In addition, the vertical long spacers 22 provided at predetermined intervals in the horizontal direction partition the space between the RC housing 1 and the steel plate 2, and the horizontal long spacer 23 closes the space from below. The grout 5 can be distributed densely between 1 and the steel plate 2.

また、ナット４をアンカー１１に装着して締め付ける際に座金３を使用するが、例えば、図４（ａ）〜（ｃ）に示すように、鋼板２の貫通孔２１とほぼ同じ内径の貫通孔３１の周囲に、ナット４の外径よりも突出する切り欠き部３２を所定角度毎に設けた座金３’を使用するようにしても良い。このような座金３’を使用してアンカー１１にナット４を装着した場合、図４（ｃ）に示すように切り欠き部３２が貫通孔３１を介して鋼板２の貫通孔２１に連通する。そのため、ＲＣ躯体１と鋼板２との間の空間にグラウト５を充填した際に、その切り欠き部３２を介してグラウト５が滲み出してくることから、その空間におけるグラウト５の充填状況を目視で確認できる。   Further, the washer 3 is used when the nut 4 is attached to the anchor 11 and tightened. For example, as shown in FIGS. 4 (a) to 4 (c), a through hole having substantially the same inner diameter as the through hole 21 of the steel plate 2 is used. A washer 3 ′ provided with a notch 32 protruding at a predetermined angle around the outer diameter of the nut 4 may be used around 31. When the nut 4 is attached to the anchor 11 using such a washer 3 ′, the notch 32 communicates with the through hole 21 of the steel plate 2 through the through hole 31 as shown in FIG. Therefore, when the grout 5 is filled in the space between the RC housing 1 and the steel plate 2, the grout 5 oozes out through the notch 32, so that the grout 5 filling state in the space is visually observed. It can be confirmed with.

１…ＲＣ躯体（コンクリート躯体）、１１…アンカー、２…鋼板、２１…貫通孔、２２…鉛直方向長尺スペーサ、２３…水平方向長尺スペーサ、３，３’…座金、３１…貫通孔、３２…切り欠き部、４…ナット。   DESCRIPTION OF SYMBOLS 1 ... RC frame (concrete frame), 11 ... Anchor, 2 ... Steel plate, 21 ... Through-hole, 22 ... Vertical long spacer, 23 ... Horizontal long spacer, 3, 3 '... Washer, 31 ... Through-hole, 32 ... notch, 4 ... nut.

Claims (3)

コンクリート躯体に固定した複数のアンカーに、そのアンカーの外径より内径が過大な複数の貫通孔を有する鋼板の該貫通孔を通しその上からナットにより締付け、コンクリート躯体の表面と鋼板の裏面との間にグラウトを充填したことを特徴とするコンクリート建造物の耐震補強構造。   A plurality of anchors fixed to the concrete frame are passed through the through holes of the steel plate having a plurality of through holes whose inner diameter is larger than the outer diameter of the anchors, and tightened with nuts from above, and the surface of the concrete frame and the back surface of the steel plate are Seismic reinforcement structure for concrete buildings, characterized by filling grout in between. 請求項１記載のコンクリート建造物の耐震補強構造において、
鋼板の裏面には、その鋼板の左右両側とその左右両側の間に所定間隔で鉛直方向に延びる鉛直方向長尺スペーサを設けると共に、その鋼板の下側に水平方向に延びる水平方向長尺スペーサを設けることを特徴とするコンクリート建造物の耐震補強構造。 In the earthquake-proof reinforcement structure of the concrete building according to claim 1,
On the back surface of the steel plate, there are provided vertical long spacers extending in the vertical direction at predetermined intervals between the left and right sides of the steel plate and the horizontal long spacers extending in the horizontal direction below the steel plate. Seismic reinforcement structure for concrete buildings, characterized by the provision of 請求項１または請求項２記載のコンクリート建造物の耐震補強構造において、
ナットと鋼板との間には、座金を使用し、その座金には、ナットの外径よりも突出して鋼板の貫通孔に連通する切り欠き部を設けることを特徴とするコンクリート建造物の耐震補強構造。 In the seismic reinforcement structure of a concrete building according to claim 1 or claim 2,
Seismic reinforcement of a concrete structure, characterized in that a washer is used between the nut and the steel plate, and the washer is provided with a notch that projects beyond the outer diameter of the nut and communicates with the through hole of the steel plate. Construction.
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