JP3975938B2 - Seismic reinforcement method for existing buildings - Google Patents

Seismic reinforcement method for existing buildings Download PDF

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Publication number
JP3975938B2
JP3975938B2 JP2003040020A JP2003040020A JP3975938B2 JP 3975938 B2 JP3975938 B2 JP 3975938B2 JP 2003040020 A JP2003040020 A JP 2003040020A JP 2003040020 A JP2003040020 A JP 2003040020A JP 3975938 B2 JP3975938 B2 JP 3975938B2
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Japan
Prior art keywords
concrete block
floor
column
bonded
vertical
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Expired - Lifetime
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JP2003040020A
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JP2004250904A (en
Inventor
安彦 増田
康平 栗田
憲 三浦
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Obayashi Corp
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Obayashi Corp
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【0001】
【発明の属する技術分野】
本発明は、既存建物の耐震補強方法に関し、特に小型プレキャストコンクリートブロックを組積して壁面を耐震補強する方法の改良に関する。
【0002】
【従来の技術】
既存建物の耐震補強工事において、溝形鋼や、平鋼、L形鋼にアンカー筋を溶接し、アンカー筋を内向きに配置した状態で鋼材を既存の柱梁架構の内面に接着し、その後鋼材で囲われた内側に鉄筋籠などを配筋した上で、柱梁架構の両側に型枠を配置し、コンクリート打設により耐震壁を構築する方法がある(特許文献1)。この方法では、後施工アンカー打設に伴う振動騒音の発生がない反面、型枠などの建込作業や、コンクリート打設とその養生などにより施工期間が長くなり、加えて休日などを利用した工事となるため、生コンなど資材調達の面での課題があった。
【0003】
これに対し、コンクリートブロックを組積して耐震壁とする方法も提案されている(特許文献2)。この方法では、型枠が不要である点や、コンクリートブロック間の隙間にグラウトを充填すればよいため、多量のコンクリートを必要としない点で、工期短縮に有効である。ところが、その反面柱及び梁の内側にコンクリートブロックのピッチに応じたアンカー筋を後施工により打設する必要があり、振動騒音の面で課題があった。
【0004】
したがって、前者の鋼材接着手法によりアンカーを柱梁架構の内側に固定した状態で柱架構の内側に、後者の手法によりコンクリートブロックを組積するようにできれば、両者の利点を享有できる。
【0005】
【特許文献1】
特開2001−27048公報
【0006】
【特許文献2】
特開平11−13291号公報
【0007】
【発明が解決しようとする課題】
しかしながら実際には、特に隅角部や柱際において、アンカー筋はコンクリートブロックに干渉し、組積し難いものとなり、実用化は不可となる。それ故、ブロック組積方法では、後施工によるアンカー打設作業が必須であり、これにより振動、騒音が発生することは仕方がないものとされていた。
【0008】
本発明は、以上の技術課題を解決するものであり、その目的は、コンクリートブロックを組積みして耐震壁を構築するにあたり、横アンカー筋の干渉を防止しつつ、組積毎に振動騒音を発生することなく横アンカー筋を後付けできるようにした既存建物の耐震補強方法を提供するものである。
【0009】
【課題を解決するための手段】
前記目的を達成するため、本発明方法は、柱梁架構を構成する床、一対の柱、及び梁により囲われた内部空間を縦横に区画し、各区画に応じた縦横長寸法であって、その上下左右に凹溝を形成したプレキャストコンクリートブロックを組積して耐震壁を構築する方法において、前記床の上面、柱の内側及び梁の下面にそれぞれに鋼板を接着し、かつ床と梁に接着される鋼板には,前記コンクリートブロックの左右継目位置に対応する位置に縦アンカー筋を突設する一方で、柱に接着される鋼板には前記コンクリートブロックの上下継目位置に対応する位置にナットを横設してなり、前記柱間に各コンクリートブロックを横列させた状態で、前記ナットに横アンカー筋をねじ込み固定する作業を一段目から最上段まで繰返すことを特徴とする。
【0010】
したがって、本発明方法にあっては、コンクリートブロックの組積に際しては、横アンカー筋による干渉がなく、その後ナットに横アンカー筋をねじ込めばよいため、コンクリートブロックの組積による利点を享有しつつ後打施工による騒音、振動の発生を防止できる。
【0011】
【発明の実施の形態】
以下、本発明の好ましい実施の形態につき、添付図面を参照して詳細に説明する。図1〜図6は本発明方法の施工手順を示す。
【0012】
先ず,図1は耐震補強壁施工前の柱梁架構を示し、床1とその両側に配置された柱2と梁3によって囲われる扁平長方形の空間4内にコンクリートブロック造の耐震補強壁を構築しようとするものである。
【0013】
空間4の面積が特定されたなら、図2の想像線で示す縦横の区画線により、空間4を縦複数に区画し、各区画を後述するプレキャストコンクリートブロックの組積空間とする。次いで、組積空間を構成する床1の上面、両柱2,2の向かい合う面及び梁3の下面に鋼材5を接着剤6を介して貼着する。鋼材5としては、図示のごとく平鋼でもよいが、溝形鋼、アングル鋼なども使用可能であることは勿論である。
【0014】
床1の表面に取付けた鋼材5及び梁3の下面に取付けた鋼材5には、その縦区画線上に沿って縦アンカー筋7の基部が溶接によって突設固定されている。また、図3の一部に拡大して示すように、柱2に接着される鋼材5には横区画線に沿って長ナット8の基部が溶接によって固定されている。
【0015】
図4は、前述のコンクリートブロック9を示すもので、その外形は前記縦横の区画線で囲われた大きさの長方形ブロックであって、その前後上下にはそれぞれ縦方向及び横方向に、隣合うブロック9との継目位置において配筋を縦通及び横通させるための半円状の目地溝9aが形成されている。
【0016】
次に、以上におけるコンクリートブロック9の組積手順を図5を用いて説明する。まず、(a)に示すように、最初のコンクリートブロック9を床1と柱2の隅角部に設置する。このとき、長ナット8はコンクリートブロック9の溝9aより突出せず、また床側から突出する縦アンカー筋7も溝9aの半円中心に突出しているため、この位置で干渉されることなくコンクリートブロック9を設置できる。
【0017】
その後、次々とコンクリートブロック9を他方側の柱位置まで横列状態に配置できる。この作業において、コンクリートブロック9の厚みは鋼材5の幅と等しいため、鋼材5の幅に合わせてコンクリートブロック9を配置すれば、組積時における正確な配列ができる。
【0018】
一段目の配列完了後は、(b)に示すように、長ナット8に横アンカー筋10をねじ込み固定する。このねじ込み作業は、コンクリートブロック9の上部側目地溝9aによる空間内で行えるため無理なく行うことができる。
【0019】
その後、縦アンカー筋7に縦筋11を接続する。接続作業は番線、溶接などによって行うことができる。また、横アンカー筋10にも(c)に示すように、横筋12を接続し、これら縦横筋11,12の交差位置を番線などで結合した後、コンクリートブロック9の溝9a内に目地コンクリートをグラウトすれば、第一段目のコンクリートブロック9列が完成する。
【0020】
さらに、その後、(c)に示すように、二段目のコンクリートブロック9の組積を行うが、少なくとも柱位置の隅角部位置にコンクリートブロック9を配置した後に長ナット8に横アンカー筋10をねじ込んだ後は第一段目と同様な手順で組積が可能であり、以後最上段の梁3の位置まで組積と配筋及びグラウト充填作業の交互繰返しが可能となるのである。
【0021】
図6、図7は、施工完了後の耐震補強壁を示すものである。同図において、各コンクリートブロック9の上下左右の継目位置中心には縦筋11,横筋12が格子状に配列されているとともに、各コンクリートブロック9の溝9a及び目地位置には前述のグラウト14が充填され、各コンクリートブロック9同士を強固に結合した一枚の耐震壁を形成している。
【0022】
【発明の効果】
以上の説明により明らかなように、本発明による既存建物の耐震補強方法によれば、コンクリートブロックを組積みして耐震壁を構築するにあたり、横アンカー筋の干渉を防止しつつ組積毎に、振動騒音を発生することなく横アンカー筋を後付けできる。
【図面の簡単な説明】
【図1】本発明方法が適用される柱梁架構の正面図である。
【図2】同柱梁架構内部を縦横複数の区画に区画するとともに、それぞれの面に鋼材を建て込んだ状態を示す正面図である。
【図3】図2のA−A線における一部拡大部分を含む断面図である。
【図4】プレキャストコンクリートブロックの三面図である。
【図5】(a)〜(c)はコンクリートブロックの組積手順を示す説明図である。
【図6】耐震補強壁の完成状態を示す正面図である。
【図7】図6のB−B線における断面図である。
【符号の説明】
1 床
2 柱
3 梁
4 内部空間
5 鋼板
6 接着剤
7 縦アンカー筋
8 長ナット
9 プレキャストコンクリートブロック
9a 目地溝
10 横アンカー筋
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a seismic reinforcement method for an existing building, and more particularly to an improvement in a method for seismic reinforcement of a wall surface by stacking small precast concrete blocks.
[0002]
[Prior art]
In the seismic reinforcement work for existing buildings, anchor bars are welded to channel steel, flat steel, and L-shaped steel, and the steel is bonded to the inner surface of the existing column beam frame with the anchor bars positioned inward. There is a method of constructing a seismic wall by placing concrete frames on both sides of a column beam frame after placing reinforcing bars etc. on the inner side surrounded by steel materials (Patent Document 1). With this method, there is no generation of vibration noise due to post-installation anchor placement, but the construction period becomes longer due to construction work such as formwork, concrete placement and curing, etc. In addition, construction using holidays etc. Therefore, there was a problem in the procurement of materials such as ready-mixed concrete.
[0003]
On the other hand, a method of building concrete blocks into a seismic wall has also been proposed (Patent Document 2). This method is effective for shortening the construction period in that a mold is not required and a gap between concrete blocks is filled with grout, so that a large amount of concrete is not required. However, on the other hand, anchor bars according to the pitch of the concrete block need to be placed inside the columns and beams by post-construction, which has a problem in terms of vibration noise.
[0004]
Accordingly, if the concrete block can be stacked inside the column frame while the anchor is fixed to the inside of the column beam frame by the former steel material bonding method, the advantages of both can be enjoyed.
[0005]
[Patent Document 1]
JP, 2001-27048, A
[Patent Document 2]
Japanese Patent Application Laid-Open No. 11-13291
[Problems to be solved by the invention]
In practice, however, the anchor bars interfere with the concrete blocks, especially at the corners and at the edges of the columns, making it difficult to lay them together, making practical application impossible. Therefore, in the block assembling method, anchor placement work by post-construction is essential, and it has been unavoidable that vibration and noise are generated.
[0008]
The present invention solves the above technical problems. The purpose of the present invention is to construct a seismic wall by assembling concrete blocks. It is intended to provide a seismic reinforcement method for an existing building that can be retrofitted with horizontal anchor bars without any occurrence.
[0009]
[Means for Solving the Problems]
In order to achieve the above object, the method of the present invention divides a floor, a pair of columns, and an internal space surrounded by a beam constituting a column beam structure vertically and horizontally, and has a vertically and horizontally long dimension corresponding to each partition, In the method of building a seismic wall by stacking precast concrete blocks with concave grooves on the top, bottom, left and right, a steel plate is bonded to each of the top surface of the floor, the inside of the column, and the bottom surface of the beam, and the floor and the beam The steel plate to be bonded is provided with vertical anchor bars at positions corresponding to the left and right seam positions of the concrete block, while the steel plate to be bonded to the column has nuts at positions corresponding to the upper and lower seam positions of the concrete block. In a state where the concrete blocks are arranged in a row between the columns, the operation of screwing and fixing a horizontal anchor bar to the nut is repeated from the first stage to the uppermost stage.
[0010]
Therefore, in the method of the present invention, when the concrete blocks are assembled, there is no interference by the horizontal anchor bars, and after that, it is only necessary to screw the horizontal anchor bars into the nut. Generation of noise and vibration due to post-installation can be prevented.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 6 show a construction procedure of the method of the present invention.
[0012]
First, Fig. 1 shows a column-beam frame before construction of a seismic reinforcement wall, and a concrete block-type seismic reinforcement wall is constructed in a flat rectangular space 4 surrounded by a floor 1, columns 2 and beams 3 arranged on both sides thereof. It is something to try.
[0013]
When the area of the space 4 is specified, the space 4 is divided into a plurality of vertical sections by vertical and horizontal dividing lines shown by imaginary lines in FIG. 2, and each section is set as a masonry space of a precast concrete block described later. Next, a steel material 5 is adhered to the upper surface of the floor 1 constituting the masonry space, the surfaces facing both the columns 2 and 2, and the lower surface of the beam 3 with an adhesive 6. As shown in the figure, the steel material 5 may be flat steel, but it is of course possible to use channel steel or angle steel.
[0014]
In the steel material 5 attached to the surface of the floor 1 and the steel material 5 attached to the lower surface of the beam 3, the base portion of the vertical anchor bar 7 is protruded and fixed along the longitudinal division line by welding. 3, the base of the long nut 8 is fixed to the steel material 5 bonded to the column 2 by welding along the horizontal dividing line.
[0015]
FIG. 4 shows the concrete block 9 described above, the outer shape of which is a rectangular block having a size enclosed by the vertical and horizontal division lines, and the vertical and horizontal directions are adjacent to each other in the vertical and horizontal directions. A semicircular joint groove 9a is formed at the joint position with the block 9 for longitudinal and transverse reinforcement.
[0016]
Next, the masonry procedure of the concrete block 9 in the above is demonstrated using FIG. First, as shown to (a), the first concrete block 9 is installed in the corner part of the floor 1 and the pillar 2. As shown in FIG. At this time, the long nut 8 does not protrude from the groove 9a of the concrete block 9, and the vertical anchor bar 7 protruding from the floor also protrudes to the center of the semicircle of the groove 9a. Block 9 can be installed.
[0017]
Thereafter, the concrete blocks 9 can be arranged in a row in succession to the column position on the other side. In this operation, since the thickness of the concrete block 9 is equal to the width of the steel material 5, if the concrete block 9 is arranged in accordance with the width of the steel material 5, an accurate arrangement at the time of assembling can be performed.
[0018]
After completion of the first stage arrangement, as shown in (b), the horizontal anchor bar 10 is screwed and fixed to the long nut 8. Since this screwing operation can be performed in the space defined by the upper joint groove 9a of the concrete block 9, it can be performed without difficulty.
[0019]
Thereafter, the vertical bars 11 are connected to the vertical anchor bars 7. Connection work can be performed by wire, welding, or the like. Further, as shown in (c), the horizontal bars 12 are connected to the horizontal anchor bars 10, and the crossing positions of these vertical and horizontal bars 11 and 12 are connected by a line or the like, and then the joint concrete is put into the grooves 9 a of the concrete block 9. If grouted, 9 rows of concrete blocks in the first stage are completed.
[0020]
Further, as shown in (c), the second-stage concrete block 9 is stacked. After the concrete block 9 is disposed at least at the corner position of the column position, the horizontal anchor bar 10 is connected to the long nut 8. After screwing, the masonry can be done in the same procedure as in the first stage, and the masonry, bar arrangement and grout filling operations can be repeated alternately up to the position of the uppermost beam 3.
[0021]
6 and 7 show the seismic reinforcement wall after the completion of construction. In the figure, vertical streaks 11 and lateral streaks 12 are arranged in a lattice pattern at the center of the joint position of each concrete block 9 in the top, bottom, left, and right, and the grout 14 described above is located at the groove 9a and joint position of each concrete block 9. A single earthquake-resistant wall is formed which is filled and the concrete blocks 9 are firmly coupled to each other.
[0022]
【The invention's effect】
As is clear from the above explanation, according to the seismic reinforcement method for an existing building according to the present invention, when building a seismic wall by assembling concrete blocks, for each masonry while preventing the interference of lateral anchor bars, Lateral anchor bars can be retrofitted without generating vibration noise.
[Brief description of the drawings]
FIG. 1 is a front view of a column beam structure to which the method of the present invention is applied.
FIG. 2 is a front view showing a state in which the inside of the column beam frame is divided into a plurality of vertical and horizontal sections, and a steel material is built in each surface.
FIG. 3 is a cross-sectional view including a partially enlarged portion taken along line AA in FIG.
FIG. 4 is a three-sided view of a precast concrete block.
FIGS. 5A to 5C are explanatory views showing a concrete block assembling procedure. FIGS.
FIG. 6 is a front view showing a completed state of the earthquake-proof reinforcement wall.
7 is a cross-sectional view taken along line BB in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Floor 2 Column 3 Beam 4 Internal space 5 Steel plate 6 Adhesive 7 Longitudinal anchor bar 8 Long nut 9 Precast concrete block 9a Joint groove 10 Lateral anchor bar

Claims (1)

柱梁架構を構成する床、一対の柱、及び梁により囲われた内部空間を縦横に区画し、各区画に応じた縦横長寸法であって、その上下左右に凹溝を形成したプレキャストコンクリートブロックを組積して耐震壁を構築する方法において、
前記床の上面、柱の内側及び梁の下面にそれぞれに鋼板を接着し、かつ床と梁に接着される鋼板には,前記コンクリートブロックの左右継目位置に対応する位置に縦アンカー筋を突設する一方で、柱に接着される鋼板には前記コンクリートブロックの上下継目位置に対応する位置にナットを横設してなり、
前記柱間に各コンクリートブロックを横列させた状態で、前記ナットに横アンカー筋をねじ込み固定する作業を一段目から最上段まで繰返すことを特徴とする既存建物の耐震補強方法。
A precast concrete block that divides the internal space surrounded by the floor, a pair of columns, and beams that make up the column beam frame vertically and horizontally, and has vertical and horizontal dimensions corresponding to each compartment, and grooves are formed vertically and horizontally. In the method of building a seismic wall by building
Steel plates are bonded to the upper surface of the floor, the inner side of the column, and the lower surface of the beam, and the vertical anchor bars protrude from the steel plate bonded to the floor and the beam at positions corresponding to the left and right joint positions of the concrete block. On the other hand, the steel plate to be bonded to the pillar is provided with a nut horizontally at a position corresponding to the upper and lower joint position of the concrete block,
A method for seismic reinforcement of an existing building, characterized in that the work of screwing and fixing a horizontal anchor bar to the nut is repeated from the first stage to the uppermost stage in a state where the concrete blocks are arranged in a row between the columns.
JP2003040020A 2003-02-18 2003-02-18 Seismic reinforcement method for existing buildings Expired - Lifetime JP3975938B2 (en)

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JP2008208643A (en) * 2007-02-27 2008-09-11 Ohbayashi Corp Structure and method for joining existing skeleton and new skeleton together
JP5026830B2 (en) * 2007-03-22 2012-09-19 鹿島建設株式会社 Reinforced concrete block wall
JP5507051B2 (en) * 2008-03-21 2014-05-28 大成建設株式会社 Seismic wall
JP2010126999A (en) * 2008-11-27 2010-06-10 Ohbayashi Corp Method of reinforcing existing skeleton, and reinforcing structure of existing skeleton
JP2011220075A (en) * 2010-04-14 2011-11-04 Ohbayashi Corp Wall construction method, wall, and face block
CN111719885B (en) * 2020-03-21 2021-10-26 东莞市大乘建筑工程技术有限公司 Laminated concrete reinforced floor and construction process

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