JP2002061202A - Foundation structure and its construction method - Google Patents
Foundation structure and its construction methodInfo
- Publication number
- JP2002061202A JP2002061202A JP2000252197A JP2000252197A JP2002061202A JP 2002061202 A JP2002061202 A JP 2002061202A JP 2000252197 A JP2000252197 A JP 2000252197A JP 2000252197 A JP2000252197 A JP 2000252197A JP 2002061202 A JP2002061202 A JP 2002061202A
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- Prior art keywords
- foundation
- reinforcing
- concrete
- damping
- pile
- Prior art date
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Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、主としてＲＣ杭、
ＳＲＣ杭といったコンクリート系圧縮材の基礎構造及び
その構築方法に関する。TECHNICAL FIELD The present invention mainly relates to an RC pile,
The present invention relates to a foundation structure of a concrete-based compressed material such as an SRC pile and a method of constructing the same.
【０００２】[0002]
【従来の技術】杭基礎は、上部構造物の鉛直荷重を支持
することが主目的であって圧縮強度特性が重要となるこ
とは言うまでもないが、地震時には、上部構造物からの
水平力によって杭頭に大きなせん断力や曲げモーメント
が作用するのみならず、振動方向の水平幅に対する高さ
の比率によっては、上部構造物にロッキング振動が生じ
て端部側が浮き上がろうとするため、該箇所に接続され
た杭に大きな引抜力が作用することがある。2. Description of the Related Art It is a matter of course that a pile foundation has a primary purpose of supporting a vertical load of an upper structure and compressive strength characteristics are important. Not only does a large shearing force or bending moment act on the head, but depending on the ratio of height to horizontal width in the vibration direction, rocking vibration occurs in the upper structure and the end side tends to float, Large pulling forces may act on the connected piles.
【０００３】かかる場合には、杭に過大な引抜力が作用
し、該杭あるいは杭が接合された基礎スラブに亀裂が生
じて引張破壊を生じたり、引抜力作用下の曲げ耐力やせ
ん断耐力の低下によって、曲げ破壊やせん断破壊が生
じ、その結果、杭本来の鉛直荷重を支持する機能が失わ
れるといった事態を招く。In such a case, an excessive pulling force acts on the pile, and a crack is generated in the pile or the foundation slab to which the pile is joined, resulting in tensile failure or a decrease in bending strength or shear strength under the action of the pulling force. The drop causes bending or shear failure, and as a result, a situation in which the function of supporting the original vertical load of the pile is lost.
【０００４】このような状況を踏まえ、本出願人は、上
部構造物のロッキング振動による杭や基礎スラブの破壊
を防止すべく、杭頭部から突出する主筋と基礎スラブと
の鉛直相対変位を許容する接合形式を検討してきた。[0004] In view of such a situation, the applicant of the present invention allows vertical relative displacement between a main bar projecting from a pile head and a foundation slab in order to prevent a pile or a foundation slab from being destroyed by rocking vibration of an upper structure. We have been examining the type of joining to be performed.
【０００５】[0005]
【発明が解決しようとする課題】かかる接合形式によれ
ば、剛接合のときとは異なり、杭やスラブに引き抜き力
が作用するのを防止することが可能となる。According to this type of connection, unlike the case of the rigid connection, it is possible to prevent the pulling force from acting on the pile or slab.
【０００６】しかしながら、きわめて大きな地震に遭遇
した場合には、上部構造物のロッキング振動により杭頭
部の主筋が基礎スラブから完全に抜け出てしまい、構造
物が転倒するおそれがあるため、基礎スラブ内での杭主
筋の定着長さを十分に確保しなければならないという問
題を生じていた。[0006] However, when an extremely large earthquake is encountered, the main vibration of the pile head is completely removed from the foundation slab due to the rocking vibration of the upper structure, and the structure may fall down. There was a problem that it was necessary to secure a sufficient anchoring length of the pile main bar at the site.
【０００７】本発明は、上述した事情を考慮してなされ
たもので、引抜力に伴う杭やスラブの破壊を防止しつつ
構造物の転倒を防止することが可能な基礎構造及びその
構築方法を提供することを目的とする。The present invention has been made in consideration of the above-mentioned circumstances, and provides a basic structure capable of preventing a pile or a slab from being broken due to a pulling force and preventing a structure from tipping over, and a method of constructing the same. The purpose is to provide.
【０００８】[0008]
【課題を解決するための手段】上記目的を達成するた
め、本発明に係る基礎構造は請求項１に記載したよう
に、杭又は柱からなる圧縮材の頭部にスラブ又はフーチ
ングからなる基礎部材が接合されるとともに前記圧縮材
及び前記基礎部材のうち、少なくともいずれか一方がコ
ンクリートで形成されてなる基礎構造において、前記圧
縮材の頭部から突出する補強材を該補強材の周囲に所定
の減衰部材が配置された状態にて前記基礎部材内に埋設
して前記補強材と前記基礎部材との鉛直相対変位を前記
減衰部材で減衰させるように構成するとともに、前記補
強材の頂部近傍を取り囲む頂部空間を前記基礎部材内に
設け、該頂部空間の下方に形成された当接面との間に所
定の間隙が形成されるよう前記補強材の頂部近傍に所定
のストッパーを取り付けたものである。In order to achieve the above object, according to the present invention, there is provided a foundation member comprising a slab or a footing on the head of a compression member comprising a pile or a pillar. In a basic structure in which at least one of the compression member and the base member is formed of concrete, a reinforcing member protruding from a head of the compression member is provided around a periphery of the reinforcing member. While the damping member is disposed, the damping member is embedded in the base member so that the vertical relative displacement between the reinforcing member and the base member is damped by the damping member, and surrounds the vicinity of the top of the reinforcing member. A top space is provided in the base member, and a predetermined stopper is mounted near the top of the reinforcing member so that a predetermined gap is formed between the base member and a contact surface formed below the top space. Those were.
【０００９】また、本発明に係る基礎構造の構築方法は
請求項２に記載したように、杭又は柱からなる圧縮材の
頭部にコンクリートで形成されたスラブ又はフーチング
からなる基礎部材が接合されてなる基礎構造の構築方法
において、前記圧縮材の頭部から突出する補強材の周囲
に所定の減衰部材を配置するとともに該補強材の頂部近
傍に所定のストッパーを取り付け、前記ストッパーを取
り囲むようにかつ該ストッパーの下方に所定の間隙が形
成されるように前記補強材の頂部近傍に中空型枠部材を
取り付け、かかる状態で前記減衰部材及び前記中空型枠
部材の周囲にコンクリートを打設して前記基礎部材を形
成するものである。According to a second aspect of the present invention, there is provided a method for constructing a foundation structure, wherein a foundation member made of concrete slab or footing is joined to a head of a compression member consisting of a pile or a pillar. In the method for constructing a basic structure, a predetermined damping member is arranged around a reinforcing member protruding from the head of the compression member, and a predetermined stopper is attached near a top of the reinforcing member so as to surround the stopper. A hollow form member is attached near the top of the reinforcing member so that a predetermined gap is formed below the stopper, and concrete is cast around the damping member and the hollow form member in such a state. It forms the base member.
【００１０】また、本発明に係る基礎構造の構築方法
は、収縮自在なコンクリート流入防止材を前記中空型枠
部材内に充填し、しかる後に前記コンクリートを打設す
るものである。[0010] In the method for constructing a foundation structure according to the present invention, a concrete inflow-preventing material that can be contracted is filled in the hollow form member, and then the concrete is poured.
【００１１】本発明に係る基礎構造及びその構築方法に
おいては、圧縮材の頭部から突出する補強材が該補強材
の周囲に所定の減衰部材が配置された状態にて基礎部材
内に埋設してあるため、上部構造物にロッキング振動が
生じた場合、圧縮材から突出する補強材は、基礎部材内
から抜け出すとともに、その抜け出しに伴って減衰部材
による減衰力が発生する。In the basic structure and the method of constructing the same according to the present invention, a reinforcing member projecting from the head of the compression member is embedded in the basic member with a predetermined damping member disposed around the reinforcing member. Therefore, when rocking vibration occurs in the upper structure, the reinforcing member protruding from the compression member escapes from the inside of the base member, and a damping force is generated by the damping member with the escape.
【００１２】すなわち、補強材と基礎部材との鉛直相対
変位が許容されることによって、圧縮材や基礎部材にお
ける引張応力の発生が未然に防止されるとともに、上述
した鉛直相対変位の発生に伴って減衰部材が減衰力を発
生させるため、上部構造物のロッキング振動は速やかに
収れんする。That is, by permitting the vertical relative displacement between the reinforcing member and the base member, the generation of tensile stress in the compression member and the base member is prevented beforehand, and the vertical relative displacement is caused by the above-described vertical relative displacement. Since the damping member generates a damping force, the rocking vibration of the upper structure is quickly reduced.
【００１３】一方、補強材の頂部近傍を取り囲む頂部空
間を基礎部材内に設け、該頂部空間の下方に形成された
当接面との間に所定の間隙が形成されるように補強材の
頂部近傍に所定のストッパーを取り付けてあるため、補
強材と基礎部材との鉛直相対変位に一定の制限が設けら
れることとなり、上部構造物の転倒が未然に防止され
る。On the other hand, a top space surrounding the top of the reinforcing material is provided in the base member, and the top of the reinforcing material is formed so that a predetermined gap is formed between the reinforcing member and a contact surface formed below the top space. Since a predetermined stopper is mounted in the vicinity, a certain restriction is provided on the vertical relative displacement between the reinforcing member and the base member, and the overstructure is prevented from falling down.
【００１４】すなわち、かかる鉛直相対変位がストッパ
ーと頂部空間下方に形成された当接面との間隙内に収ま
っている場合、いいかえれば、中小地震の場合には、上
部構造物は上述したように圧縮材及び基礎部材に引張応
力を発生させることなく、しかも補強材と基礎部材との
鉛直相対変位に伴う減衰作用によってロッキング振動が
抑制されるが、大地震の場合には、補強材に取り付けら
れたストッパーが基礎部材内の頂部空間下方に形成され
た当接面に当たって鉛直相対変位が拘束されるため、補
強材が基礎部材から抜け出すおそれはなくなり、かくし
て、上部構造物の転倒が未然に防止される。That is, when the vertical relative displacement is contained in the gap between the stopper and the contact surface formed below the top space, in other words, in the case of a small or medium-sized earthquake, the upper structure is formed as described above. Rocking vibration is suppressed by the damping effect of the vertical relative displacement between the reinforcing material and the base member without generating tensile stress on the compressed material and the base member. The vertical stopper is prevented from falling out of the base member because the stopper hits the contact surface formed below the top space in the base member, so that the reinforcing member does not fall out of the base member, thus preventing the upper structure from overturning. You.
【００１５】圧縮材としては、主として杭が該当する
が、地下階などの柱も含まれる。基礎部材としては、主
として基礎スラブや地下スラブが該当するが、フーチン
グも含まれる。補強材としては、鉄筋をはじめ鉄骨も含
まれる。The compressed material mainly corresponds to a pile, but also includes a pillar such as a basement floor. The foundation members mainly include foundation slabs and underground slabs, but also include footings. Reinforcing materials include steel frames as well as reinforcing bars.
【００１６】減衰部材をどのように構成するかは任意で
あり、摩擦減衰型、粘性減衰型、履歴減衰型のいずれを
用いてもかまわない。The configuration of the damping member is arbitrary, and any of a friction damping type, a viscous damping type, and a hysteretic damping type may be used.
【００１７】摩擦減衰型の減衰部材を用いる場合は、補
強材と基礎部材との隙間に粒状あるいは粉状物質を充填
してこれを減衰部材とし、これら粒状物質あるいは粉状
物質の相互接触による摩擦熱を利用したり、減衰部材の
摩擦面と補強材又は基礎部材の接触面との滑動に伴う摩
擦熱を利用したりすることができるが、かかる減衰部材
としては、例えば自動車用ブレーキに使用されている摩
擦材、例えば金属粉を焼結させた焼結合金パッドを使用
することが考えられる。In the case of using a friction damping type damping member, a gap between the reinforcing member and the base member is filled with a particulate or powdery material, and this is used as a damping member. It is possible to use heat, or to utilize frictional heat generated by sliding between the friction surface of the damping member and the contact surface of the reinforcing member or the base member.For example, such a damping member is used for an automobile brake. It is conceivable to use a friction material, for example, a sintered alloy pad obtained by sintering metal powder.
【００１８】粘性減衰型の減衰部材を用いる場合は、補
強材と基礎部材との隙間に減衰部材として粘弾性材を充
填することによって粘性抵抗を利用することができる。When a viscous damping type damping member is used, the viscous resistance can be used by filling a gap between the reinforcing member and the base member with a viscoelastic material as a damping member.
【００１９】履歴減衰型の減衰部材を用いる場合は、補
強材の引抜き動作に係る運動エネルギーは、減衰部材自
体の履歴減衰によって吸収され、引抜き動作を速やかに
減衰することができるが、かかる減衰部材としては、例
えば高減衰ゴムや減衰性の高い樹脂を補強材と基礎部材
との隙間に注入固化させて使用することが考えられる。When a hysteretic damping type damping member is used, the kinetic energy associated with the pull-out operation of the reinforcing member is absorbed by the hysteretic damping of the damping member itself, and the pull-out operation can be rapidly attenuated. For example, it is conceivable to use a high-damping rubber or a resin having a high damping property which is injected into a gap between the reinforcing member and the base member and solidified.
【００２０】ストッパーと当接面との間に間隙を設ける
にあたっては、中小地震時は構造物のロッキング振動を
十分吸収できるようになおかつ大地震時には浮き上がり
を拘束して構造物の転倒を防止できるように適宜その大
きさを設定すればよい。When a gap is provided between the stopper and the contact surface, the rocking vibration of the structure can be sufficiently absorbed during a small or medium-sized earthquake, and the structure can be prevented from overturning by restraining the uplift during a large earthquake. The size may be set as appropriate.
【００２１】ストッパーをどのように構成するかは任意
であり、例えば、ナットで構成して補強材に螺合するよ
うにしたり、プレートで構成したものを補強材に溶接し
たりする構成が考えられる。The configuration of the stopper is arbitrary. For example, a configuration in which the stopper is formed by a nut so as to be screwed to the reinforcing member or a plate formed by a plate is welded to the reinforcing member can be considered. .
【００２２】基礎部材のコンクリートを打設する前に補
強材の頂部近傍に取り付ける中空型枠部材は、打設時の
コンクリートの圧力に耐えられる強度を有するととも
に、コンクリート打設後は頂部空間となる内部空間にコ
ンクリートが流入することのないよう高い水密性を保持
できるものであればその構造や取付け方法は任意である
が、収縮自在なコンクリート流入防止材を中空型枠部材
内に充填し、しかる後にコンクリートを打設するように
したならば、中空型枠部材に高い水密性をもたせなくと
も、コンクリート打設時における中空型枠部材内へのコ
ンクリート流入を防止することができる。なお、コンク
リート流入防止材は収縮自在であるので、地震時におけ
る頂部空間内でのストッパーの上下動、すなわち補強材
と基礎部材との鉛直相対変位を妨げることもない。The hollow form member attached to the vicinity of the top of the reinforcing member before the concrete of the base member is cast has strength enough to withstand the pressure of the concrete at the time of casting, and becomes a top space after the concrete is cast. Any structure and mounting method can be used as long as it can maintain high watertightness so that concrete does not flow into the internal space.However, a contractible concrete inflow prevention material is filled in the hollow form member, and accordingly, If the concrete is cast later, it is possible to prevent the concrete from flowing into the hollow form member at the time of placing the concrete without giving the hollow form member high watertightness. Since the concrete inflow prevention member is contractible, it does not hinder the vertical movement of the stopper in the top space during the earthquake, that is, the vertical relative displacement between the reinforcing member and the foundation member.
【００２３】コンクリート流入防止材は、中空型枠部材
内へのコンクリートの流入を防止しなおかつコンクリー
ト打設後における頂部空間内でのストッパーの上下動を
許容するのであればどのように構成するかは任意であ
り、例えば、ゴムやクッション材等の低剛性の材料を用
いることが考えられる。The concrete inflow preventive member is configured to prevent the inflow of concrete into the hollow form member and to allow the stopper to move up and down in the top space after the concrete is cast. It is optional, and it is conceivable to use a low-rigidity material such as rubber or a cushion material.
【００２４】[0024]
【発明の実施の形態】以下、本発明に係る基礎構造及び
その構築方法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。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing the construction of a basic structure according to the present invention. It is to be noted that the same reference numerals are given to components and the like that are substantially the same as those in the conventional technology, and description thereof will be omitted.
【００２５】図１(a)は、本実施形態に係る基礎構造を
示した全体断面図、図１(b)は杭頭近傍の詳細断面図で
ある。本実施形態に係る基礎構造は図１(a)でわかるよ
うに、圧縮材であるＲＣ杭１の頭部から突出する補強材
である鉄筋５をその周囲に減衰部材としての高減衰ゴム
６を配置した状態にて基礎部材としてのＲＣ基礎スラブ
２内に埋設してあるが、該ＲＣ基礎スラブには同図(b)
に示すように定着スリーブ３を埋設してあり、鉄筋５及
びその周囲に配置された高減衰ゴム６は、定着スリーブ
３内に挿入される形で基礎スラブ２に埋設してある。FIG. 1A is an overall sectional view showing a foundation structure according to this embodiment, and FIG. 1B is a detailed sectional view near a pile head. As can be seen from FIG. 1 (a), the foundation structure according to the present embodiment includes a reinforcing bar 5 which is a reinforcing member projecting from the head of an RC pile 1 which is a compressed material, and a high damping rubber 6 as a damping member around the reinforcing bar 5. It is buried in the RC base slab 2 as a base member in the arranged state.
As shown in (1), the fixing sleeve 3 is embedded, and the reinforcing bar 5 and the high-damping rubber 6 disposed around it are embedded in the base slab 2 so as to be inserted into the fixing sleeve 3.
【００２６】定着スリーブ３は、図１(c)に示すよう
に、全体をほぼ中空円筒形状に形成し、その外周面に凹
凸７を設けてＲＣ基礎スラブ２との付着強度を確保する
ように構成してある。かかる定着スリーブ３は、例えば
繊維強化プラスチックで形成することができる。As shown in FIG. 1 (c), the entire fixing sleeve 3 is formed in a substantially hollow cylindrical shape, and irregularities 7 are provided on the outer peripheral surface thereof so that the adhesive strength with the RC base slab 2 is ensured. It is composed. The fixing sleeve 3 can be formed of, for example, a fiber-reinforced plastic.
【００２７】高減衰ゴム６は、鉄筋５と定着スリーブ３
との隙間に充填して構成してあり、鉄筋５とＲＣ基礎ス
ラブ２との間で鉛直相対変位が生じたとき、該変位が強
制変形として作用して履歴減衰が発揮されるようになっ
ている。The high-damping rubber 6 includes the reinforcing bar 5 and the fixing sleeve 3.
When a vertical relative displacement occurs between the reinforcing bar 5 and the RC foundation slab 2, the displacement acts as a forced deformation to exhibit hysteresis damping. I have.
【００２８】一方、ＲＣ基礎スラブ２内には、図１(b)
でよくわかるように鉄筋５の頂部近傍を取り囲むように
頂部空間９を形成してあるとともに、該頂部空間の下方
に形成された当接面８との間に間隙ｄが形成されるよ
う、ストッパー１０を鉄筋５の頂部近傍に取り付けてあ
る。ストッパー１０は、例えばリング状鋼板を鉄筋５に
嵌め込んだ上、溶接等で固定するようにすればよい。On the other hand, in the RC basic slab 2, FIG.
The top space 9 is formed so as to surround the vicinity of the top of the reinforcing bar 5, and the stopper d is formed so that a gap d is formed between the top surface 9 and the contact surface 8 formed below the top space. 10 is attached near the top of the reinforcing bar 5. The stopper 10 may be formed, for example, by fitting a ring-shaped steel plate to the reinforcing bar 5 and then fixing it by welding or the like.
【００２９】ストッパー１０と当接面８との間に間隙ｄ
を設けるにあたっては、中小地震時には、図示しない上
部構造物のロッキング振動を十分吸収できるよう、ま
た、大地震時には、ロッキング振動による上部構造物の
浮き上がりを拘束してその転倒を防止できるよう、その
大きさを適宜設定する。A gap d between the stopper 10 and the contact surface 8
In order to ensure that rocking vibrations of the upper structure (not shown) can be sufficiently absorbed during a small or medium-sized earthquake, and that the upper structure can be prevented from overturning due to the rocking vibration during a large earthquake. Is set appropriately.
【００３０】なお、頂部空間９は、鉄筋５の頂部近傍を
取り囲むように取り付けられた中空型枠部材４の内部空
間として形成され、当接面８は、該中空型枠材の底面と
して形成される。The top space 9 is formed as an internal space of the hollow form member 4 attached so as to surround the vicinity of the top of the reinforcing bar 5, and the contact surface 8 is formed as a bottom surface of the hollow form material. You.
【００３１】本実施形態に係る基礎構造を構築するに
は、まず、ＲＣ杭１を現場打設しあるいは既製のものを
打ち込んだ後、図２(a)に示すように、該ＲＣ杭の天端
から上方に突出している鉄筋５に定着スリーブ３を嵌め
込み、該定着スリーブと鉄筋５との隙間に同図矢印に示
すように高減衰ゴム６を注入する。In order to construct the foundation structure according to the present embodiment, first, the RC pile 1 is cast in place or a ready-made one is driven in. Then, as shown in FIG. The fixing sleeve 3 is fitted into a reinforcing bar 5 projecting upward from the end, and a high-attenuation rubber 6 is injected into a gap between the fixing sleeve and the reinforcing bar 5 as shown by an arrow in the figure.
【００３２】このとき、定着スリーブ３の中心を鉄筋５
の中心に位置合わせすることによって、定着スリーブ３
と鉄筋５との隙間間隔が全周でほぼ同寸法となるように
するのがよい。At this time, the center of the fixing sleeve 3 is
The center of the fixing sleeve 3
It is preferable that the gap between the steel bar 5 and the reinforcing bar 5 has substantially the same dimension over the entire circumference.
【００３３】次に、図２(b)に示すように、鉄筋５の頂
部近傍にストッパー１０を取り付け、次いで、該ストッ
パーを取り囲むようにかつ該ストッパーの下方に所定の
間隙ｄが形成されるように鉄筋５の頂部近傍に中空型枠
部材４を取り付ける。Next, as shown in FIG. 2B, a stopper 10 is attached near the top of the reinforcing bar 5, and a predetermined gap d is formed so as to surround the stopper and beneath the stopper. The hollow form member 4 is attached near the top of the reinforcing bar 5.
【００３４】このとき、中空型枠部材４は、打設時のコ
ンクリートの圧力に耐えられる強度を有するとともに、
コンクリート打設後は頂部空間９となる内部空間にコン
クリートが流入することのないよう高い水密性を保持で
きるように取り付ける。At this time, the hollow form member 4 has strength enough to withstand the pressure of the concrete at the time of casting.
After the concrete is cast, it is attached so as to maintain high watertightness so that the concrete does not flow into the internal space serving as the top space 9.
【００３５】中空型枠部材４の取付けが完了したなら
ば、ＲＣ基礎スラブ２の型枠工事を行った後、コンクリ
ート打設を行ってＲＣ基礎スラブ２を形成し、定着スリ
ーブ３及び中空型枠部材１０を該スラブ内に埋設する。
なお、ＲＣ杭１の天端とＲＣ基礎スラブ２の底面との間
については、引張力が伝達しないように縁を切ってお
く。When the mounting of the hollow form member 4 is completed, the RC base slab 2 is subjected to form work, and then concrete is cast to form the RC base slab 2, and the fixing sleeve 3 and the hollow formwork are formed. The member 10 is embedded in the slab.
In addition, the edge between the top end of the RC pile 1 and the bottom surface of the RC foundation slab 2 is cut so that the tensile force is not transmitted.
【００３６】図３及び図４は本実施形態に係る基礎構造
及びその構築方法の作用を示した図である。本実施形態
に係る基礎構造及びその構築方法においては、ＲＣ杭１
の頭部から突出する鉄筋５を該鉄筋の周囲に配置された
高減衰ゴム６とともに定着スリーブ３内に挿入された状
態にてＲＣ基礎スラブ２内に埋設してあるため、図３に
示すように、上部構造物１１に地震によるロッキング振
動が生じた場合、ＲＣ杭１から突出する鉄筋５は、ＲＣ
基礎スラブ２内から抜け出すとともに、その抜け出しに
伴って高減衰ゴム６による減衰力が発生する。FIGS. 3 and 4 are views showing the operation of the basic structure and the method of constructing the same according to the present embodiment. In the foundation structure and the construction method according to the present embodiment, the RC pile 1
3 is buried in the RC base slab 2 while being inserted into the fixing sleeve 3 together with the high-attenuation rubber 6 arranged around the reinforcing bar, as shown in FIG. In addition, when rocking vibration occurs due to the earthquake in the upper structure 11, the reinforcing bar 5 protruding from the RC pile 1
With the escape from the base slab 2, a damping force by the high damping rubber 6 is generated with the escape.
【００３７】すなわち、鉄筋５とＲＣ基礎スラブ２との
鉛直相対変位が許容されることによって、ＲＣ杭１やＲ
Ｃ基礎スラブ２における引張応力の発生が未然に防止さ
れるとともに、上述した鉛直相対変位の発生に伴って高
減衰ゴム６から減衰力を発生させるため、上部構造物１
１のロッキング振動は速やかに収れんする。That is, since the vertical relative displacement between the reinforcing bar 5 and the RC foundation slab 2 is allowed, the RC pile 1 and the R
The occurrence of tensile stress in the C foundation slab 2 is prevented beforehand, and the damping force is generated from the high damping rubber 6 with the occurrence of the above-described vertical relative displacement.
The rocking vibration of No. 1 quickly resolves.
【００３８】一方、図１で説明したように、鉄筋５の頂
部近傍を取り囲む頂部空間９をＲＣ基礎スラブ２内に設
け、該頂部空間の下方に形成された当接面８との間に所
定の間隙ｄが形成されるように鉄筋５の頂部近傍に所定
のストッパー１０を取り付けてあるため、鉄筋５とＲＣ
基礎スラブ２との鉛直相対変位に一定の制限が設けられ
ることとなり、上部構造物１１の転倒が未然に防止され
る。On the other hand, as described in FIG. 1, a top space 9 surrounding the vicinity of the top of the reinforcing bar 5 is provided in the RC foundation slab 2 and a predetermined space is provided between the top space 9 and the contact surface 8 formed below the top space. The predetermined stopper 10 is attached near the top of the reinforcing bar 5 so that the gap d of the reinforcing bar 5 is formed.
A certain restriction is provided on the vertical relative displacement with respect to the foundation slab 2, and the upper structure 11 is prevented from falling down.
【００３９】すなわち、かかる鉛直相対変位がストッパ
ー１０と頂部空間９下方に形成された当接面８との間隙
ｄ内に収まっている場合、いいかえれば、中小地震の場
合には、上部構造物１１は、上述したようにＲＣ杭１及
びＲＣ基礎スラブ２に引張応力を発生させることなく、
しかも鉄筋５とＲＣ基礎スラブ２との鉛直相対変位に伴
う減衰作用によってロッキング振動が抑制されるが、大
地震の場合には、図４に示すように、鉄筋５に取り付け
られたストッパー１０がＲＣ基礎スラブ２内の頂部空間
９下方に形成された当接面８に当たって鉛直相対変位が
拘束されるため、鉄筋５がＲＣ基礎スラブ２から抜け出
すおそれはなくなり、かくして、上部構造物１１の転倒
が未然に防止される。That is, when the vertical relative displacement is contained within the gap d between the stopper 10 and the contact surface 8 formed below the top space 9, in other words, in the case of a small or medium-sized earthquake, the upper structure 11 Does not generate tensile stress in the RC pile 1 and the RC foundation slab 2 as described above,
In addition, the rocking vibration is suppressed by the damping action caused by the vertical relative displacement between the reinforcing bar 5 and the RC foundation slab 2, but in the case of a large earthquake, as shown in FIG. Since the vertical relative displacement is restrained by hitting the contact surface 8 formed below the top space 9 in the foundation slab 2, there is no possibility that the reinforcing bar 5 will fall out of the RC foundation slab 2, and thus the upper structure 11 is not overturned. Is prevented.
【００４０】以上説明したように、本実施形態に係る基
礎構造及びその構築方法によれば、中小地震時には、高
減衰ゴム６による減衰作用を受けつつ設定された間隙ｄ
の範囲内で鉄筋５とＲＣ基礎スラブ２との鉛直相対変位
が許容されるので、ＲＣ杭１やＲＣ基礎スラブ２には引
張応力が発生せず、それらの引張破壊並びに引抜力に伴
う曲げ耐力やせん断耐力の低下による曲げ破壊やせん断
破壊を未然に防止することが可能となる。As described above, according to the foundation structure and the method of constructing the same according to the present embodiment, at the time of a small-to-medium-sized earthquake, the gap d set while receiving the damping action of the high damping rubber 6 is used.
The vertical relative displacement between the reinforcing bar 5 and the RC foundation slab 2 is allowed within the range of the above, so that no tensile stress is generated in the RC pile 1 or the RC foundation slab 2, and the bending strength associated with their tensile fracture and pull-out force. It is possible to prevent bending or shear failure due to a decrease in shear strength or shear strength.
【００４１】一方、大地震時には、間隙ｄを超える鉄筋
５とＲＣ基礎スラブ２との鉛直相対変位が拘束されるの
で、上部構造物１１のロッキング振動によるＲＣ基礎ス
ラブ２の浮き上がりはその範囲内で行われることとな
り、上部構造物１１が転倒することを未然に防止するこ
とができる。On the other hand, at the time of a large earthquake, the vertical relative displacement between the reinforcing bar 5 and the RC foundation slab 2 that exceeds the gap d is restricted, so that the rising of the RC foundation slab 2 due to the rocking vibration of the upper structure 11 is within the range. As a result, the upper structure 11 can be prevented from falling down.
【００４２】本実施形態では、ＲＣ杭を前提とし、その
杭頭から突出する鉄筋を定着スリーブ３に挿入するよう
にしたが、圧縮材としてはＲＣ杭に限られず、例えばＳ
ＲＣ杭であれば、該杭から突出する鉄骨に定着材を被せ
るようにしてもよい。In the present embodiment, the RC pile is assumed to be used, and the reinforcing bar projecting from the pile head is inserted into the fixing sleeve 3. However, the compression material is not limited to the RC pile, and may be, for example, an S pile.
In the case of an RC pile, a fixing material may be placed on a steel frame protruding from the pile.
【００４３】また、本実施形態では、圧縮材をＲＣ杭
１、基礎部材をＲＣ基礎スラブ２としたが、本発明に係
る基礎構造はかかる構成に限定されるものではなく、圧
縮材が鋼管杭の場合であっても基礎部材であるＲＣ基礎
スラブの引張破壊を防止することができるし、基礎部材
が鋼製梁で構成されるような場合であっても、ＲＣ杭の
引張破壊を防止することができる。In this embodiment, the compression member is the RC pile 1 and the foundation member is the RC foundation slab 2. However, the foundation structure according to the present invention is not limited to such a configuration, and the compression member is a steel pipe pile. In this case, the tensile failure of the RC foundation slab as the foundation member can be prevented, and even when the foundation member is made of steel beams, the tensile failure of the RC pile is prevented. be able to.
【００４４】また、本実施形態では、減衰部材として高
減衰ゴム６を使用したが、これに代えて減衰性の高い樹
脂を注入するようにしてもよい。In the present embodiment, the high damping rubber 6 is used as the damping member, but a resin having a high damping property may be injected instead.
【００４５】また、本実施形態では、高減衰ゴム６を注
入固化させるように構成したが、これに代えて、鉄筋５
に高減衰ゴム等で形成した減衰シートを巻き付け、その
上から定着スリーブ３を被せるようにしてもよい。In the present embodiment, the high damping rubber 6 is injected and solidified.
Alternatively, a damping sheet formed of a high damping rubber or the like may be wound around the fixing sleeve 3.
【００４６】また、本実施形態では、減衰部材として履
歴減衰型の材料を使用したが、これに代えて、粘性減衰
型や摩擦減衰型の減衰部材を使用してもよい。摩擦減衰
型の減衰部材を使用した場合は、例えば、金属粉を付着
させて構成した外周摩擦面を設けて減衰部材を構成する
ことができ、かかる場合においては、円筒状の減衰部材
を鉄筋５に被せて溶接等により該鉄筋に固定し、該減衰
部材の上から定着スリーブ３を被せるようにすればよ
い。In this embodiment, a hysteretic damping type material is used as the damping member. Alternatively, a viscous damping type or friction damping type damping member may be used. When a friction damping type damping member is used, for example, an outer circumferential friction surface formed by attaching metal powder can be provided to form the damping member. In such a case, the cylindrical damping member is replaced with a reinforcing bar 5. , And fixed to the rebar by welding or the like, and the fixing sleeve 3 may be placed over the damping member.
【００４７】また、本実施形態では、減衰部材である高
減衰ゴム６を定着スリーブ３と鉄筋５との間に充填する
ようにしたが、かかる定着スリーブ３は必ずしも必要で
はなく、場合によっては、シート状の高減衰ゴムを鉄筋
５の周囲に巻き付け、かかる状態でＲＣ基礎スラブ２を
構築するようにしてもよい。In the present embodiment, the high damping rubber 6 as the damping member is filled between the fixing sleeve 3 and the reinforcing bar 5, but such a fixing sleeve 3 is not always necessary. A sheet-like high damping rubber may be wound around the reinforcing bar 5 and the RC base slab 2 may be constructed in such a state.
【００４８】また、本実施形態では、中空型枠部材４
は、打設時のコンクリートの圧力に耐えられる強度を有
するとともに、コンクリート打設後は頂部空間９となる
内部空間にコンクリートが流入することのないよう高い
水密性を保持して取り付けるようにしたが、これにかえ
て、図５に示すように、収縮自在なコンクリート流入防
止材２１を中空型枠部材４内に充填し、しかる後にコン
クリートを打設するようにしてもよい。かかる構成によ
れば、中空型枠部材４に高い水密性をもたせなくとも、
コンクリート打設時における中空型枠部材４内へのコン
クリート流入を防止することができる。なお、コンクリ
ート流入防止材２１は収縮自在であるので、地震時にお
ける頂部空間９内でのストッパー１０の上下動、すなわ
ち鉄筋５とＲＣ基礎スラブ２との鉛直相対変位を妨げる
こともない。In this embodiment, the hollow form member 4
Has a strength capable of withstanding the pressure of the concrete at the time of casting, and is mounted with high watertightness so that concrete does not flow into the internal space which is the top space 9 after the concrete is poured. Alternatively, as shown in FIG. 5, a contractible concrete inflow prevention member 21 may be filled in the hollow form member 4 and then concrete may be poured. According to such a configuration, even if the hollow form member 4 does not have high watertightness,
It is possible to prevent concrete from flowing into the hollow form member 4 at the time of placing concrete. Since the concrete inflow prevention member 21 is contractible, it does not hinder the vertical movement of the stopper 10 in the top space 9 during the earthquake, that is, the vertical relative displacement between the reinforcing bar 5 and the RC foundation slab 2.
【００４９】コンクリート流入防止材２１は、中空型枠
部材４内へのコンクリートの流入を防止しなおかつコン
クリート打設後における頂部空間９内でのストッパー１
０の上下動を許容するのであればどのように構成するか
は任意であり、例えば、ゴムやクッション材等の低剛性
の材料を用いることが考えられる。The concrete inflow preventing member 21 prevents the concrete from flowing into the hollow form member 4 and stops the stopper 1 in the top space 9 after the concrete is cast.
The configuration is arbitrary as long as it allows zero vertical movement, and for example, a low-rigidity material such as rubber or a cushion material may be used.
【００５０】[0050]
【発明の効果】以上述べたように、本発明に係る基礎構
造及びその構築方法によれば、中小地震時には、減衰部
材による減衰作用を受けつつ設定された間隙の範囲内で
補強材と基礎部材との鉛直相対変位が許容されるので、
圧縮材や基礎部材には引張応力が発生せず、それらの引
張破壊並びに引抜力に伴う曲げ耐力やせん断耐力の低下
による曲げ破壊やせん断破壊を未然に防止することが可
能となる。As described above, according to the foundation structure and the method of constructing the same according to the present invention, in the event of a small or medium-sized earthquake, the reinforcing member and the foundation member are kept within the gap set while being subjected to the damping action of the damping member. Vertical relative displacement is allowed,
Tensile stress is not generated in the compressed material or the base member, and it is possible to prevent the fracture and the shear failure due to the tensile fracture and the decrease in the bending strength and the shear strength associated with the pull-out force.
【００５１】一方、大地震時には、上述した間隙を超え
る補強材と基礎部材との鉛直相対変位が拘束されるの
で、上部構造物のロッキング振動による基礎部材の浮き
上がりは該間隙内で行われることとなり、上部構造物が
転倒することを未然に防止することができる。On the other hand, at the time of a large earthquake, the vertical relative displacement between the reinforcing member and the base member exceeding the above-mentioned gap is restricted, so that the lifting of the base member due to rocking vibration of the upper structure is performed in the gap. In addition, the upper structure can be prevented from falling down.
【００５２】[0052]
【図１】本実施形態に係る基礎構造を示した図であり、
(a)は全体断面図、(b)は杭頭近傍の詳細断面図、(c)は
一部を断面表示した定着スリーブの側面図。FIG. 1 is a diagram showing a basic structure according to an embodiment;
(a) is an overall cross-sectional view, (b) is a detailed cross-sectional view near a pile head, and (c) is a side view of a fixing sleeve with a partial cross-sectional view.
【図２】本実施形態に係る基礎構造を構築している様子
を示した図。FIG. 2 is a view showing a state where a basic structure according to the embodiment is being constructed.
【図３】本実施形態に係る基礎構造及びその構築方法の
作用を示した図。FIG. 3 is a view showing the operation of the basic structure and the method of constructing the basic structure according to the embodiment.
【図４】本実施形態に係る基礎構造及びその構築方法の
作用を示した図。FIG. 4 is a view showing the operation of the basic structure and the method of constructing the basic structure according to the embodiment.
【図５】本実施形態の変形例に係る基礎構造を示した図
で、一部を断面表示した詳細図。FIG. 5 is a view showing a basic structure according to a modified example of the embodiment, and is a detailed view partially showing a cross section.
１ ＲＣ杭（圧縮材） ２ ＲＣ基礎スラブ（基礎部材） ４ 中空型枠部材 ５ 鉄筋（補強材） ６ 高減衰ゴム（減衰部材） ８ 当接面 ９ 頂部空間 １０ ストッパー ２１ コンクリート流入防止材 Reference Signs List 1 RC pile (compressed material) 2 RC foundation slab (foundation member) 4 Hollow form member 5 Reinforcing bar (reinforcing material) 6 High damping rubber (damping member) 8 Contact surface 9 Top space 10 Stopper 21 Concrete inflow prevention material
Claims (3)
又はフーチングからなる基礎部材が接合されるとともに
前記圧縮材及び前記基礎部材のうち、少なくともいずれ
か一方がコンクリートで形成されてなる基礎構造におい
て、 前記圧縮材の頭部から突出する補強材を該補強材の周囲
に所定の減衰部材が配置された状態にて前記基礎部材内
に埋設して前記補強材と前記基礎部材との鉛直相対変位
を前記減衰部材で減衰させるように構成するとともに、
前記補強材の頂部近傍を取り囲む頂部空間を前記基礎部
材内に設け、該頂部空間の下方に形成された当接面との
間に所定の間隙が形成されるよう前記補強材の頂部近傍
に所定のストッパーを取り付けたことを特徴とする基礎
構造。1. A foundation comprising a slab or footing base member joined to the head of a compression member consisting of a pile or a pillar, and at least one of the compression member and the base member being formed of concrete. In the structure, a reinforcing member protruding from a head of the compression member is embedded in the base member in a state where a predetermined damping member is disposed around the reinforcing member, and a vertical line is formed between the reinforcing member and the base member. While being configured to attenuate the relative displacement with the damping member,
A top space surrounding the top of the reinforcing material is provided in the base member, and a predetermined space is formed near the top of the reinforcing material such that a predetermined gap is formed between the reinforcing member and a contact surface formed below the top space. The basic structure, which is equipped with a stopper.
リートで形成されたスラブ又はフーチングからなる基礎
部材が接合されてなる基礎構造の構築方法において、 前記圧縮材の頭部から突出する補強材の周囲に所定の減
衰部材を配置するとともに該補強材の頂部近傍に所定の
ストッパーを取り付け、前記ストッパーを取り囲むよう
にかつ該ストッパーの下方に所定の間隙が形成されるよ
うに前記補強材の頂部近傍に中空型枠部材を取り付け、
かかる状態で前記減衰部材及び前記中空型枠部材の周囲
にコンクリートを打設して前記基礎部材を形成すること
を特徴とする基礎構造の構築方法。2. A method of constructing a foundation structure in which a base member made of concrete or a slab or footing made of concrete is joined to a head of a compression member made of a pile or a pillar, wherein the reinforcement projecting from the head of the compression member is provided. A predetermined damping member is arranged around the material and a predetermined stopper is attached near the top of the reinforcing member, and the reinforcing member is formed so as to surround the stopper and form a predetermined gap below the stopper. Attach a hollow form member near the top,
In this state, concrete is poured around the damping member and the hollow form member to form the foundation member, and the foundation structure is constructed.
記中空型枠部材内に充填し、しかる後に前記コンクリー
トを打設する請求項２記載の基礎構造の構築方法。3. The method according to claim 2, wherein a shrinkable concrete inflow prevention material is filled in the hollow form member, and then the concrete is poured.
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| JP2000252197A JP3741198B2 (en) | 2000-08-23 | 2000-08-23 | Basic structure and construction method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000252197A JP3741198B2 (en) | 2000-08-23 | 2000-08-23 | Basic structure and construction method |
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| Publication Number | Publication Date |
|---|---|
| JP2002061202A true JP2002061202A (en) | 2002-02-28 |
| JP3741198B2 JP3741198B2 (en) | 2006-02-01 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005113389A (en) * | 2003-10-03 | 2005-04-28 | Geotop Corp | Structure for joining pile head at low fixing degree |
| JP2006169787A (en) * | 2004-12-15 | 2006-06-29 | Fujita Corp | Structure for joining pile and footing together |
| CN106400828A (en) * | 2016-06-01 | 2017-02-15 | 中交第二航务工程局有限公司 | Steel pipe composite pile foundation applicable to deep water and coral reef geology |
| CN110284420A (en) * | 2019-06-25 | 2019-09-27 | 东南大学 | Full precast pier-the suspended deck structure of Self-resetting and its assembly method for being easy to repair after shaking |
| CN114411697A (en) * | 2022-01-28 | 2022-04-29 | 华川建设集团有限公司 | High-strength structure for building earthquake prevention and earthquake prevention method |
-
2000
- 2000-08-23 JP JP2000252197A patent/JP3741198B2/en not_active Expired - Fee Related
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005113389A (en) * | 2003-10-03 | 2005-04-28 | Geotop Corp | Structure for joining pile head at low fixing degree |
| JP2006169787A (en) * | 2004-12-15 | 2006-06-29 | Fujita Corp | Structure for joining pile and footing together |
| JP4508854B2 (en) * | 2004-12-15 | 2010-07-21 | 株式会社フジタ | Pile and footing joint structure |
| CN106400828A (en) * | 2016-06-01 | 2017-02-15 | 中交第二航务工程局有限公司 | Steel pipe composite pile foundation applicable to deep water and coral reef geology |
| CN110284420A (en) * | 2019-06-25 | 2019-09-27 | 东南大学 | Full precast pier-the suspended deck structure of Self-resetting and its assembly method for being easy to repair after shaking |
| CN110284420B (en) * | 2019-06-25 | 2021-03-09 | 东南大学 | Self-resetting full-prefabricated pier-bearing platform structure easy to restore after earthquake and assembling method thereof |
| CN114411697A (en) * | 2022-01-28 | 2022-04-29 | 华川建设集团有限公司 | High-strength structure for building earthquake prevention and earthquake prevention method |
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| Publication number | Publication date |
|---|---|
| JP3741198B2 (en) | 2006-02-01 |
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