JP2006132081A - Footing reinforcing structure - Google Patents

Footing reinforcing structure Download PDF

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JP2006132081A
JP2006132081A JP2004318737A JP2004318737A JP2006132081A JP 2006132081 A JP2006132081 A JP 2006132081A JP 2004318737 A JP2004318737 A JP 2004318737A JP 2004318737 A JP2004318737 A JP 2004318737A JP 2006132081 A JP2006132081 A JP 2006132081A
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foundation
fiber sheet
bonded
aramid fiber
fabric foundation
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JP4033354B2 (en
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Masashi Takahashi
雅司 高橋
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Sumitomo Forestry Co Ltd
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Sumitomo Forestry Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To reinforce a continuous footing of plain concrete against differential settlement and an earthquake. <P>SOLUTION: In this footing reinforcing structure 1, aramid fiber sheets 4a and 4b as fiber sheets are bonded to both side surfaces 3a and 3b of the continuous footing 2, composed of the plain concrete, in a desired horizontal length range from a raised section of the continuous footing to an upper surface thereof. Preferably, the horizontal length of the adhesion of the sheets 4a and 4b is set to be the overall length of the continuous footing. Since a projected corner and an internal corner ordinarily exist in the continuous footing, in this case, the aramid fiber sheets are bonded in an appropriately split manner, or continuously bonded while the corner, particularly, the internal corner is held by a holding member such as a metal fitting. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、主として住宅の布基礎を補強する際の基礎補強構造に関する。   The present invention mainly relates to a foundation reinforcing structure for reinforcing a cloth foundation of a house.

最近の住宅の基礎は、フーチングである底版に立設され該フーチングとともに逆T字状断面をなす鉄筋コンクリート(以下、RC)構造の布基礎として施工されることが多く、地盤沈下や地震に対して所定の強度を有する構造になっていることがほとんどであるが、古い住宅、具体的にはRC基礎として施工すべき旨が法規で定められた昭和56年より以前の住宅については、無筋コンクリート構造の布基礎が多い。   Recent housing foundations are often constructed as reinforced concrete (RC) structure fabric foundations that stand on the bottom plate that is a footing and have an inverted T-shaped cross-section along with the footing. In most cases, the structure has a predetermined strength. However, for old houses, specifically for houses before 1986, when the law stipulates that construction should be done as an RC foundation, unreinforced concrete. There are many fabric foundations.

したがって、かかる無筋コンクリートの布基礎については、何らかの補強対策を施すのが望ましく、具体的には、既存の無筋コンクリートの布基礎にRCの増し打ちによる補強を行ったりすることが多い。   Therefore, it is desirable to take some reinforcement measures for such an unreinforced concrete cloth foundation. Specifically, the existing unreinforced concrete cloth foundation is often reinforced by RC reinforcement.

特開平11-131494JP 11-131494 A 登実-3095525Tomi-3095525 登実-3087712Tomi-3087712

しかしながら、RCの増し打ちによる補強は工期的にも費用的にも実用的ではないという問題や、公知の方法では、既存建物の布基礎に対し、地震や不同沈下に起因する面内曲げモーメントに抵抗できるだけの補強を十分かつ効率的に行うことができないという問題を生じていた。   However, there is a problem that RC reinforcement is not practical in terms of construction period or cost, and in the known method, the in-plane bending moment caused by an earthquake or non-uniform settlement is applied to the cloth foundation of an existing building. There has been a problem that the reinforcement sufficient to resist cannot be performed sufficiently and efficiently.

本発明は、上述した事情を考慮してなされたもので、不同沈下や地震に対して無筋コンクリートの布基礎を補強することが可能な基礎補強構造を提供することを目的とする。   The present invention has been made in view of the above-described circumstances, and an object of the present invention is to provide a foundation reinforcing structure capable of reinforcing an unreinforced concrete cloth foundation against uneven settlement and earthquake.

上記目的を達成するため、本発明に係る基礎補強構造は請求項1に記載したように、無筋コンクリートからなる布基礎の両側面に該布基礎の立ち上がり部から天端まで所望の水平長さ範囲で繊維シートを接着することで、前記布基礎に生じる面内曲げモーメントによるひび割れ及び面外撓みによるひび割れを抑制するように構成したものである。   In order to achieve the above object, the foundation reinforcing structure according to the present invention has a desired horizontal length from the rising portion to the top edge of the fabric foundation on both sides of the fabric foundation made of unreinforced concrete. By bonding the fiber sheet in the range, it is configured to suppress cracks due to in-plane bending moments generated in the fabric foundation and cracks due to out-of-plane bending.

また、本発明に係る基礎補強構造は、無筋コンクリートからなる布基礎の屋外側側面のうち、立ち上がり部近傍と天端近傍に一対の繊維シートを上下二段で接着するとともに、該一対の繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面に繊維シートを接着したものである。   In addition, the foundation reinforcing structure according to the present invention includes a pair of fiber sheets that are bonded in two upper and lower stages in the vicinity of the rising portion and near the top end of the outdoor side surface of the cloth foundation made of unreinforced concrete, and the pair of fibers. The fiber sheet is bonded to the indoor side surface so that the intermediate height of the sheet and the height above the ground surface is the bonding position.

また、本発明に係る基礎補強構造は、前記繊維シートをアラミド繊維シートとしたものである。   In the basic reinforcing structure according to the present invention, the fiber sheet is an aramid fiber sheet.

無筋コンクリートにクラック(ひび割れ)が入るのはコンクリートの引張強度が小さいからに他ならないが、本出願人は、そもそもなぜ無筋コンクリートからなる布基礎に引張応力が発生するのかという点について基本に立ち戻り、中規模以上の建築物に見られる地中梁とも比較しながら検討を行った。   Cracks (cracks) in unreinforced concrete are due to the fact that the tensile strength of the concrete is small, but the applicant is basically concerned about the reason why tensile stress is generated in the fabric foundation made of unreinforced concrete. We went back and examined it by comparing it with the underground beams found in medium-sized and larger buildings.

ここで、RC構造物における地中梁は、その名の通り、梁として構成してあり、不同沈下や地震による面内曲げモーメント(水平軸線回りの曲げモーメント)に対して抵抗できるように配筋量や配筋位置が設定されているが、無筋コンクリート基礎については、鉄筋が配筋されていないため、面内曲げモーメントが布基礎に作用したとき、その引張側となる箇所にひび割れが入る。   Here, the underground beam in the RC structure is configured as a beam, as the name suggests, and the reinforcement is arranged so that it can resist in-plane bending moments (bending moments around the horizontal axis) due to uneven settlement or earthquakes. Although the amount and bar arrangement are set, for unreinforced concrete foundations, there are no reinforcing bars, so when an in-plane bending moment acts on the fabric foundation, cracks will occur at the tension side. .

そして、面内曲げモーメントは、主として地耐力不足による不同沈下や地震時に柱に作用する引抜き力が原因で布基礎に強制変形や外力が作用し、それが原因で布基礎内に引張応力が発生しひび割れを生じることがわかった。   The in-plane bending moment is mainly caused by the unsettled settlement due to insufficient earth bearing capacity or the pulling force acting on the column during an earthquake, resulting in forced deformation or external force acting on the fabric foundation, which causes tensile stress in the fabric foundation. It was found that cracking occurred.

この点を踏まえれば、無筋コンクリートの布基礎側面に繊維シートを単に接着すれば足りることになる。   Considering this point, it is sufficient to simply bond the fiber sheet to the side of the cloth foundation of unreinforced concrete.

しかしながら、面内曲げモーメントが発生する状況で布基礎の一方の側だけに繊維シートを接着すると、布基礎の両側で引張抵抗力に大きな差が生じ、繊維シートを接着していない側にて布基礎が面外方向に撓み、その凸側に引張応力を生じてやはりひび割れを生じる懸念がある。   However, if the fiber sheet is bonded to only one side of the fabric foundation in a situation where an in-plane bending moment is generated, a large difference in tensile resistance occurs on both sides of the fabric foundation, and the fabric sheet is bonded to the side where the fiber sheet is not bonded. There is a concern that the foundation bends in the out-of-plane direction, and a tensile stress is generated on the convex side to cause cracks.

本出願人は、かかる着眼をもとに布基礎の両側面に該布基礎の立ち上がり部から天端まで所望の水平長さ範囲で繊維シートを接着することにより、面内曲げ抵抗が大幅に向上することを実験で確認し、かくして無筋コンクリートであっても不同沈下や地震によって生じる引張応力を繊維シートに負担させ無筋コンクリートにひび割れが生じるのを抑制することができるという知見を得るに至ったものである。   Based on this viewpoint, the applicant significantly improves the in-plane bending resistance by adhering the fiber sheet to both sides of the fabric foundation in the desired horizontal length range from the rising edge to the top edge of the fabric foundation. Thus, even in unreinforced concrete, it has been found that the tensile stress generated by uneven settlement and earthquake can be borne by the fiber sheet and cracking of unreinforced concrete can be suppressed. It is a thing.

また、本出願人は、リフォーム工事において、一階床板を剥がしたり壁を一部撤去したりといった居住者の生活変更を余儀なくする事態を回避すべく、屋外側側面のうち、立ち上がり部近傍と天端近傍に一対の繊維シートを上下二段で接着するとともに、該一対の繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面に繊維シートを接着することで、屋外側と屋内側の引張強度を釣り合うようにしつつ、一階床下での作業を軽減し、リフォーム工事をさらに効率的に行うことができる新規な発明をなすに至った。   In addition, the Applicant must avoid the situation in the renovation work near the rising part of the outdoor side surface and the ceiling so as to avoid the situation where the resident's life is forced to change, such as peeling off the first-floor floorboard or removing a part of the wall. A pair of fiber sheets are bonded in the upper and lower stages in the vicinity of the ends, and the fiber sheet is attached to the indoor side surface so that the intermediate height of the pair of fiber sheets and the height above the ground surface is the bonding position. Adhesion has led to a novel invention that can reduce the work under the first floor and balance the tensile strength between the outdoor side and the indoor side, and can perform the renovation work more efficiently.

すなわち、本発明に係る基礎補強構造においては、無筋コンクリートからなる布基礎の両側面に該布基礎の立ち上がり部から天端まで所望の水平長さ範囲で繊維シートを接着したものであり、かかる構成においては、無筋コンクリートに生じる引張応力を繊維シートが負担するため、無筋コンクリートにひび割れ、特に面内曲げモーメントによって基礎天端又は立ち上がり部に曲げひび割れが入るのを未然に防止することができるとともに、布基礎の両側面に接着するため、引張力が釣り合って面外方向、すなわち屋外側か又は室内側のいずれかに撓んで側面にひび割れが生じるといった懸念もない。   That is, in the foundation reinforcing structure according to the present invention, the fiber sheet is bonded to both sides of the fabric foundation made of unreinforced concrete in a desired horizontal length range from the rising portion to the top edge of the fabric foundation. In the configuration, since the fiber sheet bears the tensile stress generated in unreinforced concrete, it is possible to prevent cracks in unreinforced concrete, especially bending cracks at the base top edge or rising part due to in-plane bending moment. At the same time, since it adheres to both side surfaces of the fabric foundation, there is no concern that the tensile forces are balanced and bent in the out-of-plane direction, that is, either on the outdoor side or on the indoor side to cause cracks on the side surfaces.

また、本発明に係る基礎補強構造においては、無筋コンクリートからなる布基礎の屋外側側面のうち、立ち上がり部近傍と天端近傍に一対の繊維シートを上下二段で接着するとともに、該一対の繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面に繊維シートを接着したものであり、かかる構成においては、上述した発明と同様の作用効果を奏するのに加えて、屋内側を施工する際、地盤を掘削する必要がないため、作業員の負担が軽減されリフォーム工事を効率よく行うことが可能となる。   Further, in the foundation reinforcing structure according to the present invention, a pair of fiber sheets are bonded in two steps up and down in the vicinity of the rising portion and near the top end of the outdoor side surface of the cloth foundation made of unreinforced concrete, The fiber sheet is bonded to the indoor side so that the intermediate height of the fiber sheet is equal to or higher than the ground surface, and in this configuration, the same effects as the above-described invention are achieved. In addition to the above, since it is not necessary to excavate the ground when constructing the indoor side, the burden on the worker is reduced and the renovation work can be performed efficiently.

繊維シートは、アラミド繊維シートのほか、炭素繊維シートなど引張強度の高い繊維をシート状に形成したものを使用することができる。   As the fiber sheet, in addition to an aramid fiber sheet, a fiber sheet having a high tensile strength such as a carbon fiber sheet can be used.

以下、本発明に係る基礎補強構造の実施の形態について、添付図面を参照して説明する。なお、従来技術と実質的に同一の部品等については同一の符号を付してその説明を省略する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a foundation reinforcing structure according to the present invention will be described with reference to the accompanying drawings. Note that components that are substantially the same as those of the prior art are assigned the same reference numerals, and descriptions thereof are omitted.

(第1実施形態) (First embodiment)

図1は、本実施形態に係る基礎補強構造を示した図である。同図でわかるように、本実施形態に係る基礎補強構造1は、無筋コンクリートからなる布基礎2の両側面3a,3bに該布基礎の立ち上がり部から天端まで所望の水平長さ範囲で繊維シートであるアラミド繊維シート4a,4bを接着してある。なお、図示していないが、無筋コンクリートからなる布基礎2は、底版であるフーチングと一体のコンクリート構造として該フーチングに立設される場合と、フーチングはなく割栗石の上に直接設置されている場合とがある。   FIG. 1 is a view showing a foundation reinforcing structure according to the present embodiment. As can be seen in the figure, the foundation reinforcing structure 1 according to the present embodiment has a desired horizontal length range from the rising portion to the top edge of the fabric foundation on both side surfaces 3a and 3b of the fabric foundation 2 made of unreinforced concrete. Aramid fiber sheets 4a and 4b, which are fiber sheets, are bonded. Although not shown, the fabric foundation 2 made of unreinforced concrete is installed on the footing as a concrete structure integral with the bottom plate footing, or directly on the cracked stone without footing. There is a case.

アラミド繊維シート4a,4bを接着する水平長さは、布基礎の全長とするのが望ましいが、布基礎には、通常、出隅部や入隅部が存在するので、かかる場合には適宜、分割接着するか、隅部、特に入隅部を金物等の押さえ部材で押さえながら連続接着すればよい。   The horizontal length to which the aramid fiber sheets 4a and 4b are bonded is preferably the entire length of the fabric foundation. However, since the fabric foundation usually has a protruding corner portion and an entering corner portion, What is necessary is just to carry out division | attachment adhesion | attachment, or to adhere | attach continuously, pressing down a corner part, especially an entrance corner part, with pressing members, such as a metal object.

本実施形態に係る基礎補強構造1を施工するには、まず、図1(b)に示すように屋外側の地盤を掘り下げて布基礎2の屋外側側面3aを露出させる。   In order to construct the foundation reinforcing structure 1 according to this embodiment, first, as shown in FIG. 1 (b), the outdoor side ground is dug down to expose the outdoor side surface 3a of the fabric foundation 2.

次に、屋外側側面3aを清掃し、コンクリート表面の不陸調整などの下地処理を必要に応じて行った後、プライマー、下塗り用接着剤を順次塗布する。   Next, after the outdoor side surface 3a is cleaned and a ground treatment such as unevenness adjustment of the concrete surface is performed as necessary, a primer and an undercoat adhesive are sequentially applied.

次に、アラミド繊維シート4aを接着した後、再度、その上から上塗り用接着剤を塗布し、必要に応じて塗装等で仕上げを行う。   Next, after adhering the aramid fiber sheet 4a, an overcoat adhesive is applied again from above, and finishing is performed by painting or the like as necessary.

一方、屋内側、すなわち一階床下でも同様な作業を行う。すなわち、同図(b)に示すように床下の地盤を掘り下げて布基礎2の屋内側側面3bを露出させる。   On the other hand, the same operation is performed indoors, that is, under the first floor. That is, as shown in FIG. 2B, the ground under the floor is dug down to expose the indoor side surface 3b of the fabric foundation 2.

次に、布基礎2の屋内側側面3bを清掃し、コンクリート表面の不陸調整などの下地処理を必要に応じて行った後、プライマー、下塗り用接着剤を順次塗布する。   Next, after cleaning the indoor side surface 3b of the fabric foundation 2 and performing a ground treatment such as uneven adjustment of the concrete surface as necessary, a primer and an undercoat adhesive are sequentially applied.

次に、アラミド繊維シート4bを接着した後、再度、その上から上塗り用接着剤を塗布する。   Next, after adhering the aramid fiber sheet 4b, the top coating adhesive is applied again from above.

アラミド繊維シート4a,4bを施工した後は、掘り下げた地盤を埋め戻し、補強工事を完了する。なお、接着剤の種類やアラミド繊維シート4aの詳細な接着方法については、公知の手段から適宜選択すればよい。   After the aramid fiber sheets 4a and 4b are constructed, the ground dug down is backfilled to complete the reinforcement work. In addition, what is necessary is just to select suitably from a well-known means about the kind of adhesive agent and the detailed adhesion | attachment method of the aramid fiber sheet 4a.

以上説明したように、本実施形態に係る基礎補強構造1によれば、無筋コンクリートの布基礎2に生じる引張応力をアラミド繊維シート4a,4bが負担するため、無筋コンクリートからなる布基礎2にひび割れ、特に面内曲げモーメントによって基礎天端又は立ち上がり部に曲げひび割れが入るのを未然に防止することができる。   As described above, according to the foundation reinforcing structure 1 according to this embodiment, since the aramid fiber sheets 4a and 4b bear the tensile stress generated in the cloth foundation 2 of unreinforced concrete, the cloth foundation 2 made of unreinforced concrete. It is possible to prevent the occurrence of bending cracks at the base top edge or the rising portion due to cracks, particularly, in-plane bending moment.

図2(a)は、アラミド繊維シート4a,4bを施工しない場合、地耐力不足の地盤反力と柱からの鉛直荷重により、又は不同沈下による強制変形を受けることによって布基礎2に生じる面内曲げモーメントを示した曲げモーメント図、同図(b)は同図(a)の中央の柱近傍において布基礎2に生じる曲げひび割れの様子を示した側面図、同図(c)は同図(a)の両端の柱近傍において布基礎2に生じる曲げひび割れの様子を示した側面図である。   Fig. 2 (a) shows the in-plane generated in the fabric foundation 2 due to the ground reaction force and the vertical load from the column that are insufficient in earth strength, or forced deformation due to non-settlement when the aramid fiber sheets 4a and 4b are not constructed. Bending moment diagram showing bending moment, Fig. (B) is a side view showing the bending cracks that occur in the fabric foundation 2 near the center column in Fig. (A), and Fig. (C) is the figure ( It is the side view which showed the mode of the bending crack which arises in the cloth foundation 2 in the column vicinity of the both ends of a).

また、本実施形態に係る基礎補強構造1によれば、布基礎2の両側面にアラミド繊維シート4a,4bを接着するため、引張力が釣り合って面外方向、すなわち屋外側か又は室内側のいずれかに撓んで側面にひび割れが生じるといった懸念もない。   Moreover, according to the foundation reinforcement structure 1 which concerns on this embodiment, since the aramid fiber sheets 4a and 4b are adhere | attached on the both sides | surfaces of the fabric foundation 2, a tensile force balances and it is an out-of-plane direction, ie, the outdoor side or indoor side. There is no concern that any of them will bend and crack on the side.

図3は、布基礎2の屋外側側面3aだけにアラミド繊維シート4aを施工した場合、面外方向の撓みによって布基礎2に生じる曲げひび割れの様子を示した水平断面図である。   FIG. 3 is a horizontal cross-sectional view showing a state of bending cracks generated in the fabric foundation 2 due to bending in the out-of-plane direction when the aramid fiber sheet 4a is applied only to the outdoor side surface 3a of the fabric foundation 2. FIG.

本発明に係る基礎補強構造の作用効果を実証するため、曲げ加力試験を行った。   In order to demonstrate the effect of the foundation reinforcing structure according to the present invention, a bending force test was performed.

まず、長さ3,000mm、高さ400mm、幅約120mmの無筋コンクリートを試験体とし、かかる試験体を両端支持した状態で中央近傍に鉛直荷重を加える曲げ加力試験を行った結果、18kNで破壊した。   First, as a result of conducting a bending force test in which a vertical load was applied to the vicinity of the center of an unreinforced concrete having a length of 3,000 mm, a height of 400 mm, and a width of about 120 mm, with the test body supported at both ends, 18 kN Destroyed.

次に、同じ形状の無筋コンクリートの片面にアラミド繊維シートを全面に接着した試験体に対し同様に曲げ加力試験を行った結果、約25kNまで耐力が伸び、アラミド繊維シートを両面に接着した試験体(一方の面には全面接着し、他方の面には中央近傍のみ接着)では、62kNの耐荷重性を示した。   Next, as a result of performing a bending force test on a test body in which an aramid fiber sheet was bonded to the entire surface of one side of unreinforced concrete having the same shape, the yield strength was increased to about 25 kN, and the aramid fiber sheet was bonded to both surfaces. The test specimen (adhered to the entire surface and adhered to the other surface only in the vicinity of the center) showed a load resistance of 62 kN.

ちなみに、現行基準のRC基礎を想定した同形状の試験体では42kNで破壊しており、アラミド繊維シートを両面に接着することでRC基礎よりも曲げに強い構造になることができることが実証できた。   By the way, in the same shape test specimen assuming the current standard RC foundation, it was destroyed at 42 kN, and it was proved that the aramid fiber sheet can be bonded to both sides to make the structure more resistant to bending than the RC foundation. .

図4に上述した曲げ加力試験の結果を示す。   FIG. 4 shows the results of the bending force test described above.

(第2実施形態) (Second Embodiment)

次に、第2実施形態について説明する。なお、第1実施形態と実質的に同一の部品等については同一の符号を付してその説明を省略する。   Next, a second embodiment will be described. Note that components that are substantially the same as those of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.

図5は、本実施形態に係る基礎補強構造を示した図である。同図でわかるように、本実施形態に係る基礎補強構造11は、無筋コンクリートからなる布基礎2の屋外側側面3aのうち、立ち上がり部近傍と天端近傍に繊維シートである一対のアラミド繊維シート14a,14aを上下二段で接着するとともに、該一対のアラミド繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面3bにアラミド繊維シート14bを接着してある。   FIG. 5 is a view showing a foundation reinforcing structure according to the present embodiment. As can be seen from the figure, the foundation reinforcing structure 11 according to this embodiment includes a pair of aramid fibers that are fiber sheets in the vicinity of the rising portion and the top end of the outdoor side surface 3a of the cloth foundation 2 made of unreinforced concrete. The sheets 14a and 14a are bonded in two upper and lower stages, and the aramid fiber sheet 14b is attached to the indoor side surface 3b so that the intermediate height of the pair of aramid fiber sheets and the height above the ground surface is the bonding position. Is adhered.

アラミド繊維シート14a,14a及びアラミド繊維シート14bを接着する水平長さは、布基礎の全長とするのが望ましいが、布基礎には、通常、出隅部や入隅部が存在するので、かかる場合には適宜、分割接着するか、隅部、特に入隅部を金物等の押さえ部材で押さえながら連続接着すればよい。   The horizontal length for bonding the aramid fiber sheets 14a and 14a and the aramid fiber sheet 14b is preferably the entire length of the cloth foundation, but the cloth foundation usually has a protruding corner portion and an ingress corner portion. In such a case, it may be divided and bonded as appropriate, or may be continuously bonded while pressing corners, particularly corners, with a pressing member such as a hardware.

アラミド繊維シート14bは上述したように、一対のアラミド繊維シート14a,14aの中間高さであってかつ地盤面以上の高さが接着位置となるように位置決めするが、アラミド繊維シート14a,14aの中間高さは、例えばそれらの幅の中心間の範囲とし、その範囲内でアラミド繊維シート14bの幅中心がくるようにアラミド繊維シート14bの接着位置を決定するようにすればよい。   As described above, the aramid fiber sheet 14b is positioned so that it is at an intermediate height between the pair of aramid fiber sheets 14a and 14a and at a height equal to or higher than the ground surface, but the aramid fiber sheets 14a and 14a. The intermediate height may be a range between the centers of the widths, for example, and the bonding position of the aramid fiber sheet 14b may be determined so that the center of the width of the aramid fiber sheet 14b is within the range.

なお、本実施形態では、屋内側の地盤を掘り下げないため、アラミド繊維シート14bの下縁が地盤面以上となるようにする。   In the present embodiment, since the ground on the indoor side is not dug down, the lower edge of the aramid fiber sheet 14b is set to be equal to or greater than the ground surface.

本実施形態に係る基礎補強構造11を施工するには、まず、屋外側の地盤を掘り下げて布基礎2の屋外側側面3aを露出させる。   In order to construct the foundation reinforcing structure 11 according to the present embodiment, first, the outdoor side ground is dug down to expose the outdoor side surface 3 a of the fabric foundation 2.

次に、屋外側側面3aを清掃し、コンクリート表面の不陸調整などの下地処理を必要に応じて行った後、プライマー、下塗り用接着剤を順次塗布する。   Next, after the outdoor side surface 3a is cleaned and a ground treatment such as unevenness adjustment of the concrete surface is performed as necessary, a primer and an undercoat adhesive are sequentially applied.

次に、アラミド繊維シート14a,14aを上述したように上下二段にそれぞれ接着した後、再度、その上から上塗り用接着剤を塗布し、必要に応じて塗装等で仕上げを行う。   Next, after the aramid fiber sheets 14a and 14a are bonded in two upper and lower stages as described above, an overcoat adhesive is applied again from above, and finishing is performed by painting or the like as necessary.

一方、屋内側、すなわち一階床下では、床下の地盤を掘り下げず、地盤面以上の高さにて布基礎2の屋内側側面3bにアラミド繊維シート14bを接着する。   On the other hand, the aramid fiber sheet 14b is bonded to the indoor side surface 3b of the fabric foundation 2 at a height equal to or higher than the ground surface without digging the ground under the floor on the indoor side, that is, under the first floor.

すなわち、布基礎2の屋内側側面3bを清掃し、コンクリート表面の不陸調整などの下地処理を必要に応じて行った後、プライマー、下塗り用接着剤を順次塗布する。   That is, the indoor side surface 3b of the fabric foundation 2 is cleaned, and after performing a ground treatment such as uneven adjustment of the concrete surface as necessary, a primer and an undercoat adhesive are sequentially applied.

次に、アラミド繊維シート14bを接着した後、再度、その上から上塗り用接着剤を塗布する。   Next, after adhering the aramid fiber sheet 14b, the top coating adhesive is applied again from above.

アラミド繊維シート14a,14aを施工した後は、屋外側にて掘り下げた地盤を埋め戻し、補強工事を完了する。なお、接着剤の種類やアラミド繊維シート14a,14a及びアラミド繊維シート14bの詳細な接着方法については、公知の手段から適宜選択すればよい。   After the aramid fiber sheets 14a and 14a are constructed, the ground dug down on the outdoor side is backfilled to complete the reinforcement work. In addition, what is necessary is just to select suitably from a well-known means about the kind of adhesive agent, and the detailed adhesion | attachment method of the aramid fiber sheets 14a and 14a and the aramid fiber sheet 14b.

以上説明したように、本実施形態に係る基礎補強構造11によれば、無筋コンクリートからなる布基礎2の屋外側側面3aのうち、立ち上がり部近傍と天端近傍に一対のアラミド繊維シート14a,14aを上下二段で接着するとともに、該一対のアラミド繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面3bにアラミド繊維シート14bを接着するようにしたので、上述した第1実施形態と同様の作用効果を奏するほか、屋内側での地盤掘削作業が必要なくなるため、一階床下での作業性が格段に向上するとともに、それに伴って一階床板を剥がしたり壁を一部撤去したりする必要性が確実になくなり、かくして、居住者の生活を変更することなく、リフォーム工事をより効率的に行うことが可能となる。   As explained above, according to the foundation reinforcing structure 11 according to the present embodiment, a pair of aramid fiber sheets 14a in the vicinity of the rising portion and the vicinity of the top end of the outdoor side surface 3a of the fabric foundation 2 made of unreinforced concrete. 14a is bonded in two upper and lower stages, and the aramid fiber sheet 14b is bonded to the indoor side surface 3b so that the intermediate height of the pair of aramid fiber sheets and the height above the ground surface is the bonding position. As a result, the same effects as those of the first embodiment described above can be obtained, and ground excavation work on the indoor side is not required. Therefore, workability under the first floor is greatly improved, and accordingly, There is no need to peel off floorboards or remove some walls, thus making renovation work more efficient without changing the lives of residents. It made.

面内曲げモーメントによる曲げひび割れの様子や面外撓みによる曲げひび割れの様子は第1実施形態と同様であるが、面内曲げモーメントによる曲げひび割れは、図2(b)、(c)でわかるように布基礎2の立ち上がり部か、又は天端近傍であり、上下二段に配置されたアラミド繊維シート4a,4aは、かかる曲げひび割れの発生を確実に防止することができる。   Bending cracks due to in-plane bending moments and bending cracks due to out-of-plane bending are the same as in the first embodiment, but bending cracks due to in-plane bending moments can be seen in Figs. 2 (b) and 2 (c). In addition, the aramid fiber sheets 4a and 4a, which are at the rising portion of the fabric base 2 or near the top end and are arranged in two upper and lower stages, can reliably prevent the occurrence of such bending cracks.

加えて、図3に示した面外撓みによる曲げひび割れについても、屋内側に接着されたアラミド繊維シート4bによって同様に防止されることは言うまでもない。   In addition, it goes without saying that bending cracks due to out-of-plane bending shown in FIG. 3 are similarly prevented by the aramid fiber sheet 4b bonded to the indoor side.

第1実施形態に係る基礎補強構造の図であり、(a)は側面図、(b)はA−A線に沿う断面図。It is a figure of the foundation reinforcement structure concerning a 1st embodiment, (a) is a side view and (b) is a sectional view which meets an AA line. 面内曲げモーメント図とそれによる曲げひび割れを示した図。The in-plane bending moment diagram and the figure which shows the bending crack by it. 面外撓みによる曲げひび割れを示した図。The figure which showed the bending crack by the out-of-plane deflection. 曲げ加力試験の結果を示したグラフ。The graph which showed the result of the bending force test. 第2実施形態に係る基礎補強構造の図であり、(a)は側面図、(b)はB−B線に沿う断面図。It is a figure of the foundation reinforcement structure which concerns on 2nd Embodiment, (a) is a side view, (b) is sectional drawing which follows a BB line.

符号の説明Explanation of symbols

1,11 基礎補強構造
2 布基礎
3a,3b 布基礎の側面
4a,4b,14a,14b アラミド繊維シート(繊維シート)
DESCRIPTION OF SYMBOLS 1,11 Foundation reinforcement structure 2 Cloth foundation 3a, 3b Side face 4a, 4b, 14a, 14b of cloth foundation Aramid fiber sheet (fiber sheet)

Claims (3)

無筋コンクリートからなる布基礎の両側面に該布基礎の立ち上がり部から天端まで所望の水平長さ範囲で繊維シートを接着することで、前記布基礎に生じる面内曲げモーメントによるひび割れ及び面外撓みによるひび割れを抑制するように構成したことを特徴とする基礎補強構造。 By bonding the fiber sheet to both sides of the fabric foundation made of unreinforced concrete in the desired horizontal length range from the rising edge to the top edge of the fabric foundation, cracks due to in-plane bending moment generated on the fabric foundation and out-of-plane A basic reinforcement structure characterized by being configured to suppress cracking due to bending. 無筋コンクリートからなる布基礎の屋外側側面のうち、立ち上がり部近傍と天端近傍に一対の繊維シートを上下二段で接着するとともに、該一対の繊維シートの中間高さであってかつ地盤面以上の高さが接着位置となるように、屋内側側面に繊維シートを接着したことを特徴とする基礎補強構造。 Among the outdoor side surfaces of the fabric foundation made of non-reinforced concrete, a pair of fiber sheets are bonded in two upper and lower stages near the rising portion and near the top end, and the ground surface is at an intermediate height between the pair of fiber sheets A basic reinforcing structure characterized in that a fiber sheet is bonded to the side surface on the indoor side so that the above height is the bonding position. 前記繊維シートをアラミド繊維シートとした請求項1又は請求項2記載の基礎補強構造。 The basic reinforcement structure according to claim 1 or 2, wherein the fiber sheet is an aramid fiber sheet.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008121239A (en) * 2006-11-10 2008-05-29 Misawa Homes Co Ltd Reinforcement structure of foundation

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008121239A (en) * 2006-11-10 2008-05-29 Misawa Homes Co Ltd Reinforcement structure of foundation

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