JP2003090146A - Lower structure for base isolation building - Google Patents
Lower structure for base isolation buildingInfo
- Publication number
- JP2003090146A JP2003090146A JP2001281864A JP2001281864A JP2003090146A JP 2003090146 A JP2003090146 A JP 2003090146A JP 2001281864 A JP2001281864 A JP 2001281864A JP 2001281864 A JP2001281864 A JP 2001281864A JP 2003090146 A JP2003090146 A JP 2003090146A
- Authority
- JP
- Japan
- Prior art keywords
- retaining wall
- pit
- cantilever slab
- tip
- building
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Building Environments (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は基礎上に設置した免
震装置に支持されている免震建築物における下部構造に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a substructure of a base-isolated building supported by a base-isolation device installed on a foundation.
【０００２】[0002]
【従来の技術】地震や強風によって建築物が大きく揺れ
るのを抑制するために、基礎と建築物との間に免震装置
を介装し、この免震装置によって地震時等において発生
する振動を吸収させるようにした免震建築物が広く知ら
れている。2. Description of the Related Art A seismic isolation device is provided between a foundation and a building in order to prevent a building from significantly shaking due to an earthquake or a strong wind. Seismic-isolated buildings that absorb the energy are widely known.
【０００３】このような免震建築物の１つの具体的な構
造としては、図４に示すように、地中に所定深さのピッ
ト21を掘削すると共に該ピット21の下方の地盤に基礎22
を造成してこの基礎22により上記ピット21の底面に施工
したピット床スラブ23を支持させ、さらに、該ピット床
スラブ23上の複数箇所に一定高さの下側支持部材26を一
体に打設すると共に各下側支持部材26上に免震装置25を
設置し、この免震装置25上に上側支持部材27を介して建
築物30を支持させてなる免震建築物がある。As one specific structure of such a seismic isolated building, as shown in FIG. 4, a pit 21 having a predetermined depth is excavated in the ground and a foundation 22 is formed on the ground below the pit 21.
The pit floor slab 23 constructed on the bottom surface of the pit 21 is supported by the foundation 22, and the lower support members 26 having a constant height are integrally formed at a plurality of locations on the pit floor slab 23. In addition, there is a seismic isolated building in which the seismic isolation device 25 is installed on each lower support member 26, and the building 30 is supported on the seismic isolation device 25 via the upper support member 27.
【０００４】このように構成した免震構造物において
は、地震発生時に振動によってピット21の擁壁24と免震
装置25上の上側支持部材27とが衝突する虞れがあるの
で、これを避けるために、擁壁24と上側支持部材27との
対向面間の間隙部ｂを、予想される最大水平変位量に余
裕を持たせた距離に設定している。しかしながら、この
ような間隙部ｂを設けておくと、雨水がこの間隙部ｂの
上方からピット21内に浸入して免震装置25等に悪影響を
及ぼすことになる。In the seismic isolation structure constructed as described above, there is a possibility that the retaining wall 24 of the pit 21 and the upper support member 27 on the seismic isolation device 25 may collide due to vibration when an earthquake occurs. For this reason, the gap b between the facing surfaces of the retaining wall 24 and the upper support member 27 is set to a distance that allows the expected maximum horizontal displacement amount to have a margin. However, if such a gap b is provided, rainwater will enter the pit 21 from above the gap b and adversely affect the seismic isolation device 25 and the like.
【０００５】従って、ピット21内への雨水の浸入を防止
するために、従来から建築物30の最下層階側の外壁に上
記間隙部ｂを覆ったキャンチスラブ32を突設し、このキ
ャンチスラブ32の先端部を上記ピット21の擁壁24から外
側の地表面上方にまで突出させ且つ該キャンチスラブ32
の上面を先端に向かって下方に傾斜する傾斜面に形成し
て雨水を擁壁外にまで案内し、キャンチスラブ32の先端
部下面に設けている水切り部33から擁壁外の地表面に滴
下或いは流下させている。Therefore, in order to prevent rainwater from entering the pit 21, a cantilever slab 32 which covers the above-mentioned gap b is projectingly provided on the outer wall of the lowermost floor of the building 30 in the past. The tip of the cantilever slab 32 is projected from the retaining wall 24 of the pit 21 to a position above the outer ground surface and
The rainwater is guided to the outside of the retaining wall by forming the upper surface of the slanted surface downwardly toward the tip, and dripping from the draining part 33 provided on the lower surface of the tip of the cantilever slab 32 to the ground surface outside the retaining wall. Or it is flowing down.
【０００６】[0006]
【発明が解決しようとする課題】しかしながら、上記免
震建築物30を狭い敷地内に構築する場合には、キャンチ
スラブ32の先端部がピット21の擁壁24から敷地境界線Ａ
側に突出しているので、該キャンチスラブ32の先端と敷
地境界線Ａとの間の幅がそれだけ狭くなることになる。
この幅ａは、一般的に避難時等において人が通行可能な
65cm幅にしておくことが要求されるが、上記のように水
切りのためにキャンチスラブ32の先端部を擁壁24から敷
地境界線Ａ側に突出させると、上記必要な幅を確保する
ことが困難になるという問題点があった。However, when constructing the seismic isolated building 30 in a narrow site, the tip of the cantilever slab 32 is separated from the retaining wall 24 of the pit 21 to the site boundary line A.
Since it projects to the side, the width between the tip of the cantilever slab 32 and the site boundary line A becomes narrower by that amount.
This width a is generally passable by people during evacuation.
It is required to have a width of 65 cm, but if the tip of the cantilever slab 32 is projected from the retaining wall 24 to the site boundary line A side for draining as described above, the required width can be secured. There was a problem that it would be difficult.
【０００７】さらに、キャンチスラブ32の張り出し長さ
をその先端がピット21の擁壁24から外側の地表面上に達
するまで長くすると、強度上、その厚みを増大させた
り、梁を設ける必要が生じて建築費が高くつくという問
題点があった。Further, if the extension length of the cantilever slab 32 is increased until the tip reaches from the retaining wall 24 of the pit 21 to the outside ground surface, it is necessary to increase its thickness or to provide a beam for strength. There was a problem that the construction cost was high.
【０００８】本発明は上記のような問題点に鑑みてなさ
れたもので、キャンチスラブの張り出し長さを短くして
いるにもかかわらず、該キャンチスラブの先端水切り部
からの擁壁外への雨水の確実な排出を可能にし、敷地境
界線とキャンチスラブの先端間に上記必要な幅を確保し
得るようにした免震建築物の下部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-mentioned problems, and despite the fact that the extension length of the cantilever slab is shortened, it extends to the outside of the retaining wall from the tip draining portion of the cantilever slab. An object of the present invention is to provide a substructure of a base-isolated building that enables reliable discharge of rainwater and can secure the required width between the site boundary line and the tip of the cantilever slab.
【０００９】[0009]
【課題を解決するための手段】上記目的を達成するため
に、本発明の免震建築物の下部構造は、請求項１に記載
したように、基礎上に設けたピット内に免震装置を設置
し、この免震装置によって建築物を支持させていると共
に建築物の下部から水平方向に先端が上記ピットの擁壁
上に達する位置までキャンチスラブを張り出して該キャ
ンチスラブの先端部下面に設けている水切り部から滴下
する水を擁壁外に排出するように構成している免震構造
物の下部構造において、上記水切り部をピットの擁壁の
上端面に近接状態で対向させていると共に該擁壁の上端
面に水切り部から滴下する水を擁壁外に排出する案内面
を形成してなる構造としている。In order to achieve the above object, the substructure of the base-isolated building of the present invention has a seismic isolation device installed in a pit provided on a foundation as described in claim 1. It is installed and the building is supported by this seismic isolation device, and the cantilever slab is extended from the bottom of the building to the position where the tip reaches the retaining wall of the pit in the horizontal direction, and is provided on the lower surface of the tip of the cantilever. In the lower structure of the seismic isolation structure that is configured to discharge the water dripping from the draining part outside the retaining wall, the draining part is opposed to the upper end surface of the retaining wall of the pit in a close state. A guide surface is formed on the upper end surface of the retaining wall to discharge the water dripping from the draining portion to the outside of the retaining wall.
【００１０】請求項２に係る発明は、上記請求項１に記
載の免震建築物の下部構造において、ピットの擁壁の上
端にピット内に向かって張り出している突縁部を突設
し、この突縁部の上方にキャンチスラブの先端部を位置
させていると共に突縁部の上端面に、キャンチスラブの
先端部下面に設けている水切り部から滴下する水を擁壁
外に排出する案内面を形成していることを特徴とする。According to a second aspect of the present invention, in the substructure of the base-isolated building according to the first aspect, a projecting edge portion protruding toward the inside of the pit is provided at the upper end of the retaining wall of the pit. A guide for discharging the water dripping from the drainer provided on the lower surface of the tip of the cantilever slab to the upper end face of the cantilever slab while the tip of the cantilever slab is located above the projecting edge. It is characterized by forming a surface.
【００１１】請求項３に係る発明は、上記擁壁の上端面
又は擁壁の突縁部上端面に形成している案内面の好まし
い形状に関するものであって、この案内面をピットの擁
壁の外壁面に向かって斜め下方に傾斜した傾斜面として
いることを特徴とする。なお、このような傾斜面以外
に、擁壁の上端面又は擁壁の突縁部上端面に、条溝を設
けておき、この条溝内から擁壁外に雨水を排出する通路
等を形成した構造としておくこともできる。The invention according to claim 3 relates to a preferred shape of a guide surface formed on the upper end surface of the retaining wall or the upper edge surface of the projecting edge portion of the retaining wall, wherein the guide surface is a pit retaining wall. It is characterized in that it has an inclined surface which is inclined obliquely downward toward the outer wall surface. In addition to such an inclined surface, a groove is formed on the upper end surface of the retaining wall or the upper edge surface of the retaining edge of the retaining wall to form a passage for discharging rainwater from inside the groove to the outside of the retaining wall. It can also be set as a structure.
【００１２】[0012]
【作用】建築物の下部に張り出しているキャンチスラブ
によってピットの擁壁とピット内における建築物の下部
との間の間隙部を覆っており、従って、雨水が該間隙部
に浸入することなくこのキャンチスラブの上面を伝って
該キャンチスラブの先端部に達し、その先端部下面に設
けている水切り部によって擁壁の上端面上に滴下、或い
は流下する。この際、擁壁の上端面には雨水を擁壁外に
排出する案内面を形成しているので、水切り部を設けて
いるキャンチスラブの先端部を擁壁外の地表面側に突出
させることなく、水切り部から擁壁の上端面上に滴下、
或いは流下する雨水を上記案内面によって擁壁外の地表
面に確実に排出することができる。[Function] The cantilever slab that projects to the bottom of the building covers the gap between the retaining wall of the pit and the bottom of the building inside the pit, and therefore rainwater does not enter this gap. It reaches the tip of the cantilever slab along the upper surface of the cantilever, and drops or flows down on the upper end surface of the retaining wall by a draining portion provided on the lower surface of the tip. At this time, a guide surface for discharging rainwater to the outside of the retaining wall is formed on the upper end surface of the retaining wall.Therefore, the tip of the cantilever slab provided with the water draining portion should be projected to the ground surface side outside the retaining wall. Instead, dripping from the draining part on the upper end surface of the retaining wall,
Alternatively, the rainwater that flows down can be reliably discharged to the ground surface outside the retaining wall by the guide surface.
【００１３】このように、キャンチスラブの先端部を擁
壁から外側に突出させることなく雨水の排出が行えるの
で、キャンチスラブの先端面と敷地境界線との間の幅を
広くとることができ、従って、避難時等において人が通
行するのに必要な幅を確保することができるものであ
り、また、キャンチスラブの張り出し長さが短いので、
肉厚を薄くしても所定の強度を維持し得るから、材料費
の削減を図ることができる。As described above, since the rainwater can be discharged without the tip of the cantilever slab protruding outward from the retaining wall, the width between the tip of the cantilever slab and the site boundary line can be widened. Therefore, it is possible to secure a width necessary for a person to pass through at the time of evacuation and the like, and since the extension length of the cantilever slab is short,
Since the predetermined strength can be maintained even if the wall thickness is made thin, the material cost can be reduced.
【００１４】さらに、請求項２に記載したように、ピッ
トの擁壁の上端にピット内に向かって張り出している突
縁部を突設し、この突縁部の上方にキャンチスラブの先
端部を位置させていると共にその先端部下面に設けてい
る水切り部の下方における上記突縁部の上端面に、擁壁
外に排水する案内面を形成しておくことによって、キャ
ンチスラブを擁壁の上方まで張り出すことなく、その先
端部下面に設けている水切り部から滴下或いは流下する
水を突縁部の上端面に形成している案内面を通じて擁壁
外に確実に排出することができ、また、このように構成
するとキャンチスラブの張り出し長さが一層短くてす
み、材料費の低減は勿論、キャンチスラブの先端面と敷
地境界線との間の幅を一層広くとることができる。Further, as described in claim 2, a projecting edge portion protruding toward the inside of the pit is provided at the upper end of the retaining wall of the pit, and a tip portion of the cantilever slab is provided above the projecting edge portion. The cantilever slab is formed above the retaining wall by forming a guide surface for draining the retaining wall outside the retaining wall on the upper end surface of the projecting edge portion below the water draining portion provided on the lower surface of the tip portion of the retaining wall. It is possible to reliably discharge the water dripping or flowing down from the water draining portion provided on the lower surface of the tip end to the outside of the retaining wall through the guide surface formed on the upper end surface of the projecting edge portion without overhanging to the bottom. With such a configuration, the overhanging length of the cantilever can be further shortened, and the material cost can be reduced and the width between the tip surface of the cantilever and the site boundary line can be made wider.
【００１５】擁壁の上端面やこの擁壁の上端からピット
内に向かって突設している突縁部の上端面に形成した上
記排水案内面としては請求項３に記載したように、擁壁
の外側面に向かって斜め下方に傾斜させた傾斜面からな
るので、形状が簡単で容易に形成することができると共
にこの傾斜面によって確実に擁壁外に排出することがで
きる。As the drainage guide surface formed on the upper end surface of the retaining wall or the upper end surface of the projecting edge portion projecting from the upper end of the retaining wall toward the inside of the pit, as described in claim 3, Since it is an inclined surface that is inclined obliquely downward toward the outer side surface of the wall, it can be easily formed with a simple shape, and can be reliably discharged outside the retaining wall by this inclined surface.
【００１６】[0016]
【発明の実施の形態】次に、本発明の具体的な実施の形
態を図面について説明すると、１は敷地境界線Ａに隣接
した地中に掘削、形成している所定深さの基礎部造成用
ピットで、このピット１の下方の地中にコンクリートの
打設によって基礎２を造成していると共に該基礎２の上
端に連なるピット１の底面に基礎２と一体の一定厚みを
有するピット床スラブ３を同じくコンクリートの打設に
よって造成してあり、さらに、ピット２の周壁面に下端
が床スラブ３と一体化し、上端面がピット１の開口端、
即ち、地表面Ｂに達している所定の肉厚を有する擁壁４
をコンクリートの打設によって一体に造成している。こ
の擁壁４の上端面には、その幅方向の中央部から地表面
Ｂ側、即ち、該擁壁４の外壁面上端に向かって斜め下方
に傾斜した傾斜面からなる排水案内面4aを形成してい
る。BEST MODE FOR CARRYING OUT THE INVENTION Next, a concrete embodiment of the present invention will be described with reference to the drawings. 1 is a foundation portion having a predetermined depth which is excavated and formed in the ground adjacent to the site boundary line A. A pit floor slab having a constant thickness integrated with the foundation 2 on the bottom surface of the pit 1 that is continuous with the upper end of the foundation 2 by forming concrete in the ground below the pit 1 3 is also formed by pouring concrete, and the lower end is integrated with the floor slab 3 on the peripheral wall surface of the pit 2, and the upper end surface is the open end of the pit 1.
That is, the retaining wall 4 reaching the ground surface B and having a predetermined wall thickness
Is made by casting concrete. On the upper end surface of the retaining wall 4, a drainage guide surface 4a is formed which is an inclined surface inclined obliquely downward from the center portion in the width direction toward the ground surface B side, that is, toward the upper end of the outer wall surface of the retaining wall 4. is doing.
【００１７】また、上記ピット１内において、その床ス
ラブ３上の複数箇所には免震装置５が設置されてあり、
これらの免震装置５によって建築物10を支持させてい
る。詳しくは、建築物10における各柱11の下方に位置す
る床スラブ３上にこの床スラブ３と一体に造成した一定
高さを有するコンクリート製の短柱形状の下側支持部材
６を配設し、各下側支持部材６上に上記免震装置５を載
置してその下面を下側支持部材６に固定していると共に
この免震装置５上に同じく一定高さを有するコンクリー
ト製の短柱形状の上側支持部材７を載置してその下面を
免震装置５の上面に固定してあり、該上側支持部材７の
上面で建築物10の柱11の下端面を支持している。In the pit 1, seismic isolation devices 5 are installed at a plurality of locations on the floor slab 3.
The building 10 is supported by these seismic isolation devices 5. Specifically, on the floor slab 3 located below each of the columns 11 in the building 10, the lower support member 6 made of concrete and having a constant height and integrally formed with the floor slab 3 is provided. , The base isolation device 5 is placed on each lower support member 6 and the lower surface of the base isolation device 5 is fixed to the lower support member 6. A pillar-shaped upper support member 7 is placed and the lower surface thereof is fixed to the upper surface of the seismic isolation device 5, and the upper surface of the upper support member 7 supports the lower end surface of the pillar 11 of the building 10.
【００１８】上記免震装置５としては、ゴム板を積層し
てなる積層ゴムや、ゴム板と金属板との積層体、或い
は、すべり支承、転がり支承、弾塑性減衰材、流体系減
衰材等の適宜な免震装置を採用することができる。As the seismic isolation device 5, a laminated rubber formed by laminating rubber plates, a laminated body of rubber plates and metal plates, a sliding bearing, a rolling bearing, an elastic-plastic damping material, a fluid damping material, etc. Appropriate seismic isolation device can be adopted.
【００１９】ピット１内に設置された上記免震装置５に
おいて、建築物10の外壁側の柱11を支持している免震装
置５上の上側支持部材７とピット１の擁壁４とは、地震
発生時に互いの衝突を避けるために、所定幅（距離）の
間隙部ｂを存して対向している。この間隙部ｂの幅寸法
は、予想される大地震時の解析水平変位量に余裕をもた
せた寸法であって、一般的には50cm位に設定されてい
る。In the seismic isolation device 5 installed in the pit 1, the upper support member 7 on the seismic isolation device 5 supporting the column 11 on the outer wall side of the building 10 and the retaining wall 4 of the pit 1 are In order to avoid collision with each other when an earthquake occurs, they face each other with a gap b having a predetermined width (distance). The width dimension of the gap b is a dimension that has a margin for the expected analysis horizontal displacement amount at the time of a large earthquake, and is generally set to about 50 cm.
【００２０】上記建築物10における最下階層（一階層）
の床スラブ12は、ピット１の上端開口部の高さ位置に設
けられていると共にこの高さ位置に相当する建築物10の
下部外壁に、該外壁から水平方向に先端部が上記擁壁４
の上方に達する位置までキャンチスラブ13を張り出して
あり、このキャンチスラブ13によってピット１の擁壁４
と免震装置５上の上側支持部材７間の間隙部ｂの上方空
間部を覆って雨水がピット１内に吹き込むのを防止して
いる。The lowest floor (one floor) in the building 10
The floor slab 12 is provided at the height position of the upper end opening of the pit 1, and is provided on the lower outer wall of the building 10 corresponding to this height position, and the front end portion of the floor slab 12 extends horizontally from the outer wall.
A cantilever slab 13 is extended to a position reaching above the pit 1. The cantilever slab 13 allows the retaining wall 4 of the pit 1 to be extended.
The rainwater is prevented from blowing into the pit 1 by covering the space above the gap b between the upper support members 7 on the seismic isolation device 5.
【００２１】キャンチスラブ13はその上面を建築物10の
外壁側から先端に向かって下方に緩傾斜した傾斜面13a
に形成していると共に、先端部下面を擁壁４の上端面か
ら上方に僅かな隙間を存して対向させてあり、さらに、
その先端面13b は地表面Ｂ側に突出することなく擁壁４
の外壁面の上方、又は、該外壁面から内側に没入させた
位置となるようにキャンチスラブ13の張り出し長さを設
定して該キャンチスラブ13の先端面13b と敷地境界線Ａ
との間の幅（距離）ａを避難時等において人が通行可能
な65cm幅以上に形成していると共に、キャンチスラブ13
の先端部下面に、擁壁４の上端面に形成している上記排
水案内面4aに近接させた状態で対向した断面下向きコ字
状の水切り部14を設けている。The cantilever slab 13 has its upper surface gently inclined downward from the outer wall side of the building 10 toward the tip.
In addition, the lower surface of the tip end portion is made to face upward from the upper end surface of the retaining wall 4 with a slight gap, and
The tip surface 13b of the retaining wall 4 does not project to the ground surface B side.
The extension length of the cantilever slab 13 is set so as to be located above the outer wall surface of the cantilever slab 13 or inside the outer wall surface.
The width (distance) a between the cantilever slab 13 and the width is 65 cm or more so that a person can pass through it during evacuation.
On the lower surface of the tip end portion, there is provided a water draining portion 14 having a downward U-shaped cross section, which is opposed to the drainage guide surface 4a formed on the upper end surface of the retaining wall 4 and is close to the drainage guide surface 4a.
【００２２】このように建築物10の下部構造を構成して
いるので、降雨時において雨水がキャンチスラブ13の傾
斜上面を伝って先端に達すると、その先端面13b から滴
下、或いは流下すると共に該先端面13b の下端から内側
に回り込んだ雨水は水切り部14によってそれ以上建築物
10側に流動するのを阻止され、該水切り部14によって水
切りされて擁壁４の排水案内面4a上に滴下或いは流下
し、該案内面4aを通じて擁壁４外の地表面Ｂ側に排水さ
れる。なお、キャンチスラブ13の先端面13b と敷地境界
線Ａとの間の幅（距離）ａが避難時等において人が通行
可能な65cm幅以上に形成することができれば、キャンチ
スラブ13の先端面13b を擁壁４の外壁から地表面Ｂ側に
僅かに突出させた構造としておいてもよく、要するに、
キャンチスラブ13の先端部下面に設けている水切り部14
を擁壁４の上端排水案内面4a上に対向させた構造として
おけばよい。Since the substructure of the building 10 is constructed in this way, when rainwater reaches the tip along the inclined upper surface of the cantilever slab 13 during rainfall, it drops or flows down from the tip surface 13b. Rainwater flowing inward from the lower end of the tip surface 13b is further removed by the draining part 14 in the building.
It is prevented from flowing to the 10 side, is drained by the water draining portion 14, drops or flows down on the drainage guide surface 4a of the retaining wall 4, and is drained to the ground surface B side outside the retaining wall 4 through the guide surface 4a. It In addition, if the width (distance) a between the tip surface 13b of the cantilever slab 13 and the site boundary line A can be formed to be 65 cm or more so that a person can pass through during evacuation, the tip surface 13b of the cantilever slab 13 can be formed. May have a structure in which it slightly protrudes from the outer wall of the retaining wall 4 to the ground surface B side, in short,
Drainer 14 provided on the lower surface of the tip of the cantilever slab 13.
May be arranged so as to face the upper end drainage guide surface 4a of the retaining wall 4.
【００２３】図３は、本発明の建築物の下部構造におけ
る別な実施の形態を示すもので、上記実施の形態におい
ては、建築物10の外壁からのキャンチスラブ13の張り出
し長さをその先端部がピット１の擁壁４の上方に達する
までの長さに形成しているが、この実施の形態において
は、キャンチスラブ13の張り出し長さをその先端部が擁
壁４の上方に達することなく、さらに短くした構造とし
ているものである。FIG. 3 shows another embodiment of the substructure of the building according to the present invention. In the above embodiment, the length of the cantilever slab 13 protruding from the outer wall of the building 10 is set to the tip thereof. The part is formed to have a length until it reaches above the retaining wall 4 of the pit 1, but in this embodiment, the protruding length of the cantilever slab 13 is such that the tip portion thereof reaches above the retaining wall 4. Instead, it has a shorter structure.
【００２４】即ち、ピット１の上記擁壁４の上端に、該
上端からピット１内に向かって所定幅を有する突縁部4b
を突設してあり、この突縁部4bの上端面に、擁壁４の上
端面に向かって斜め下方に緩やかに傾斜した排水案内面
4cを形成している。なお、この排水案内面4cは突縁部4b
の上端面における外側半部分に形成しているが、全突出
幅に亘って傾斜した排水案内面としておいてもよく、ま
た、この排水案内面4cの下傾端に連なる上記擁壁４の上
端面を水平な面に形成しているが、この擁壁４の上端面
も上記排水案内面4cの下傾端から擁壁４の外壁上端にま
でさらに下方に傾斜した傾斜面に形成しておいてもよ
い。That is, at the upper end of the retaining wall 4 of the pit 1, a projecting edge portion 4b having a predetermined width from the upper end toward the inside of the pit 1 is formed.
And a drainage guide surface gently inclined obliquely downward toward the upper end surface of the retaining wall 4 on the upper end surface of the projecting edge portion 4b.
Forming 4c. In addition, this drainage guide surface 4c has a ridge 4b.
Although it is formed on the outer half of the upper end surface of the drainage guide surface, it may be formed as a drainage guide surface that is inclined over the entire projecting width. Although the end surface is formed as a horizontal surface, the upper end surface of the retaining wall 4 is also formed as an inclined surface that is further inclined downward from the downwardly inclined end of the drainage guide surface 4c to the upper end of the outer wall of the retaining wall 4. You may stay.
【００２５】一方、上記建築物10の外壁から張り出して
いるキャンチスラブ13の先端部は擁壁４の上記突縁部4b
上に近接させた状態で位置させてあり、その先端部下面
に設けている水切り部14を排水案内面4cの上傾端部上に
対向させている。On the other hand, the front end of the cantilever slab 13 protruding from the outer wall of the building 10 is the projecting edge 4b of the retaining wall 4.
The water draining portion 14 provided on the lower surface of the tip end portion of the drainage guide surface 4c is positioned so as to be close to the upper side and faces the upper inclined end portion of the drainage guide surface 4c.
【００２６】上記突縁部4bの張り出し長さ、即ち、ピッ
ト１の内方に向かって突出した突出幅が大きいと、大き
な地震が発生した時に、該突縁部4bの突出内端面と免震
装置５上に上部支持部材７を介して支持されている建築
物10の柱11の対向下端部とが衝突する虞れが生じるの
で、これらの突縁部4bの突出内端面と柱11との対向面間
の間隙部ｃの寸法（距離）が、予想される大地震時の解
析水平変位量に余裕を持たせた寸法、即ち、上述したよ
うに、擁壁４の内面と上部支持部材７との対向面間の間
隙部ｂの寸法に略等しくなるように、突縁部4bの突出幅
を設定している。その他の構成については上記図１、図
２で示した実施の形態と同様であるので、同一部分には
同一符号を付して詳細な説明を省略する。If the projecting length of the projecting edge 4b, that is, the projecting width projecting inward of the pit 1 is large, when the large earthquake occurs, the projecting inner end surface of the projecting edge 4b and the base isolation are isolated. Since there is a possibility that the lower ends of the columns 11 of the building 10 supported on the device 5 via the upper support member 7 may collide with each other, the projecting inner end surfaces of these projecting edge portions 4b and the columns 11 may collide with each other. The dimension (distance) of the gap c between the facing surfaces is a dimension that allows a predicted analysis horizontal displacement amount during a large earthquake, that is, as described above, the inner surface of the retaining wall 4 and the upper support member 7 The projecting width of the projecting edge 4b is set so as to be approximately equal to the size of the gap b between the surfaces facing each other. Since other configurations are similar to those of the embodiment shown in FIGS. 1 and 2, the same parts are designated by the same reference numerals and detailed description thereof will be omitted.
【００２７】このように建築物10の下部構造を構成して
いるので、降雨時において雨水がキャンチスラブ13の傾
斜上面を伝って先端に達すると、その先端面13b から擁
壁４の上記突縁部4bの排水案内面4c上に滴下、或いは流
下すると共に該先端面13b の下端から内側に回り込んだ
雨水は水切り部14によってそれ以上建築物10側に流動す
るのを阻止され、該水切り部14によって水切りされて同
様に上記突縁部4bの排水案内面4c上に滴下、或いは流下
し、該排水案内面4cから擁壁４の上端面を通じて擁壁４
外の地表面Ｂ側に排水される。Since the substructure of the building 10 is constructed in this manner, when rainwater reaches the tip through the inclined upper surface of the cantilever slab 13 during rainfall, the tip surface 13b of the cantilever slab 13 leads to the above-mentioned edge of the retaining wall 4. Rainwater dripping or flowing down on the drainage guide surface 4c of the portion 4b and flowing inward from the lower end of the tip surface 13b is blocked by the draining portion 14 from further flowing to the building 10 side, and the draining portion Similarly, the water is drained by 14 and drops or flows down onto the drainage guide surface 4c of the projecting edge portion 4b, and the retaining wall 4 passes from the drainage guide surface 4c through the upper end surface of the retaining wall 4.
It is drained to the outside surface B side.
【００２８】この建築物10の下部構造によれば、建築物
10が敷地境界線Ａにかなり接近した敷地内に建築された
場合であっても、キャンチスラブ13の先端をピット１の
擁壁４の上端面から内側に位置させることができるの
で、敷地境界線Ａと該キャンチスラブ13の先端面との間
の幅（距離）ａを避難時等において人が通行可能な65cm
幅以上の幅に容易に設定することができる。According to the substructure of this building 10,
Even if 10 is built on the site that is quite close to the site boundary line A, the tip of the cantilever slab 13 can be located inside from the upper end surface of the retaining wall 4 of the pit 1, so the site boundary line A width (distance) a between A and the tip surface of the cantilever slab 13 is 65 cm that allows a person to pass through during evacuation.
It can be easily set to a width larger than the width.
【００２９】なお、以上のいずれの実施の形態において
も、擁壁４の上端面、又は擁壁４の上端から内方に張り
出している突縁部4bの上端面に設けて排水案内面4b又は
4cを地表面Ｂ側に向かって斜め下方に緩やかに傾斜した
傾斜面によって形成しているが、この傾斜面に代えて、
キャンチスラブ13の先端部下面に設けている水切り部14
に対向する擁壁４の上端面、又は突縁部4bの上端面に断
面Ｖ字状或いは断面Ｕ字状の条溝を設けておき、この条
溝の適所から地表面Ｂ或いは地中に連通する排出通路を
形成した構造としておいてもよい。In any of the above embodiments, the drainage guide surface 4b or the drain guide surface 4b is provided on the upper end surface of the retaining wall 4 or on the upper end surface of the projecting edge portion 4b protruding inward from the upper end of the retaining wall 4.
4c is formed by an inclined surface that is gently inclined downward toward the ground surface B side. Instead of this inclined surface,
Drainer 14 provided on the lower surface of the tip of the cantilever slab 13.
Is provided on the upper end surface of the retaining wall 4 or the upper end surface of the projecting edge portion 4b facing each other with a V-shaped or U-shaped cross section, and communicates from an appropriate position of the groove to the ground surface B or the ground. The discharge passage may be formed to have a structure.
【００３０】[0030]
【発明の効果】以上のように本発明の免震建築物の下部
構造によれば、基礎上に設けたピット内に免震装置を設
置し、この免震装置によって建築物を支持させていると
共に建築物の下部から水平方向に先端部が上記ピットの
擁壁上に達する位置までキャンチスラブを張り出して該
キャンチスラブの先端部下面に設けている水切り部から
滴下する水を擁壁外に排出するように構成している免震
構造物の下部構造において、上記水切り部をピットの擁
壁の上端面に近接状態で対向させていると共に該擁壁の
上端面に水切り部から滴下する水を擁壁外に排出する案
内面を形成しているので、キャンチスラブの張り出し長
さが短くなって敷地境界線と該キャンチスラブの先端面
との間に、避難時等において人が通行するのに必要な十
分な幅を確保することができるものであり、その上、キ
ャンチスラブの張り出し長さが短いので、肉厚を薄くし
ても所定の強度を得ることができると共に材料費の削減
を図ることができるものである。As described above, according to the substructure of the seismic isolation building of the present invention, the seismic isolation device is installed in the pit provided on the foundation, and the seismic isolation device supports the building. At the same time, the cantilever slab is projected horizontally from the bottom of the building to a position where the tip reaches the retaining wall of the pit, and the water dripping from the drainer provided on the lower surface of the tip of the cantilever is discharged outside the retaining wall. In the lower structure of the seismic isolation structure configured to do so, the water draining portion is made to face the upper end surface of the retaining wall of the pit in close proximity, and the water dropping from the draining portion is applied to the upper end surface of the retaining wall. Since the guide surface that discharges to the outside of the retaining wall is formed, the projecting length of the cantilever slab is shortened so that people can pass between the site boundary line and the tip surface of the cantilever slab during evacuation. Ensuring the necessary and sufficient width Preparative are those can, In addition, since the short overhang length of Kyanchisurabu, in which it is possible to reduce the material cost it is possible to be thinned the thickness obtain a predetermined strength.
【００３１】さらに、キャンチスラブの先端部下面に設
けている水切り部をピットの擁壁の上端排水案内面上に
対向させているので、キャンチスラブの張り出し長さを
短くしているにもかかわらず、キャンチスラブの水切り
部から擁壁の上端面上に滴下、或いは流下する雨水を上
記案内面によって擁壁外の地表面に確実に排出すること
ができる。Further, since the water draining portion provided on the lower surface of the tip of the cantilever slab is opposed to the upper end drainage guide surface of the retaining wall of the pit, the overhanging length of the cantilever slab is shortened. The rainwater dripping or flowing down from the draining portion of the cantilever onto the upper end surface of the retaining wall can be reliably discharged to the ground surface outside the retaining wall by the guide surface.
【００３２】また、請求項２に係る発明によれば、上記
ピットの擁壁の上端にピット内に向かって張り出してい
る突縁部を突設し、この突縁部の上方にキャンチスラブ
の先端部を位置させているので、キャンチスラブの張り
出し長さをさらに短くすることができ、従って、建築物
が敷地境界線にかなり接近した敷地内に建築された場合
であっても、敷地境界線と該キャンチスラブの先端面と
の間に、避難時等において人が充分に通行可能な幅を確
保することができる。その上、上記突縁部の上端面に、
キャンチスラブの先端部下面に設けている水切り部から
滴下する水を擁壁外に排出する案内面を形成しているの
で、キャンチスラブの張り出し長さを擁壁の内面に達し
ない短い長さに形成していても、キャンチスラブの先端
部下面に設けている水切り部から滴下或いは流下する水
を突縁部の上端面に形成している案内面を通じて擁壁外
に確実に排出することができる。According to the second aspect of the present invention, a projecting edge portion protruding toward the inside of the pit is provided at the upper end of the retaining wall of the pit, and the tip of the cantilever slab is provided above the projecting edge portion. Since the part is located, the extension length of the cantilever slab can be further shortened, and therefore, even if the building is built on the site considerably close to the site boundary line, It is possible to secure a sufficient width between the cantilever slab and the tip end surface of the cantilever slab so that a person can pass through it during evacuation or the like. In addition, on the upper end surface of the protruding edge,
Since the guide surface that discharges the water dripping from the draining part provided on the lower surface of the tip of the cantilever slab is formed outside the retaining wall, the extension length of the cantilever slab is set to a short length that does not reach the inner surface of the retaining wall. Even if it is formed, it is possible to reliably discharge the water dripping or flowing down from the water draining portion provided on the lower surface of the tip portion of the cantilever slab to the outside of the retaining wall through the guide surface formed on the upper end surface of the projecting edge portion. .
【００３３】さらにまた、請求項３に係る発明によれ
ば、上記案内面をピットの擁壁の外壁面に向かって斜め
下方に傾斜した傾斜面としているので、形状が簡単で容
易に形成することができると共にこの傾斜面によって雨
水を確実に擁壁外に排出することができる。Further, according to the invention of claim 3, since the guide surface is an inclined surface inclined obliquely downward toward the outer wall surface of the retaining wall of the pit, the shape is simple and easy to form. In addition, this inclined surface can reliably discharge rainwater to the outside of the retaining wall.
【図１】本発明の一実施の形態を示す縦断側面図、FIG. 1 is a vertical sectional side view showing an embodiment of the present invention,
【図２】その要部の拡大縦断側面図、FIG. 2 is an enlarged vertical side view of the main part,
【図３】本発明の別な実施の形態を示す縦断側面図、FIG. 3 is a vertical sectional side view showing another embodiment of the present invention,
【図４】従来例を示す縦断側面図。FIG. 4 is a vertical sectional side view showing a conventional example.
Ａ 敷地境界線 Ｂ 地表面 １ ピット ２ 基礎 ３ ピットの床スラブ ４ 擁壁 4a 排水案内面 4b 突縁部 ５ 免震装置 10 建築物 13 キャンチスラブ 14 水切り部 A site boundary line B ground surface 1 pit 2 foundation 3 pit floor slab 4 retaining wall 4a Drainage guide surface 4b ridge 5 seismic isolation device 10 buildings 13 Canchi Slab 14 Drainer
フロントページの続き Ｆターム(参考） 2E001 DA03 DG02 EA02 FA12 FA21 FA71 HA06 KA02 Continued front page F term (reference) 2E001 DA03 DG02 EA02 FA12 FA21 FA71 HA06 KA02
Claims (3)
置し、この免震装置によって建築物を支持させていると
共に建築物の下部から水平方向に先端部が上記ピットの
擁壁上に達する位置までキャンチスラブを張り出して該
キャンチスラブの先端部下面に設けている水切り部から
滴下する水を擁壁外に排出するように構成している免震
構造物の下部構造において、上記水切り部をピットの擁
壁の上端面に近接状態で対向させていると共に該擁壁の
上端面に水切り部から滴下する水を擁壁外に排出する案
内面を形成していることを特徴とする免震建築物の下部
構造。1. A seismic isolation device is installed in a pit provided on a foundation, and the seismic isolation device is used to support a building, and the tip of the seismic isolation device horizontally extends from the bottom of the building onto the retaining wall of the pit. In the lower structure of the seismic isolation structure, which is configured to project the cantilever slab up to the position where the water drops dripping from the drainer provided on the lower surface of the tip of the cantilever slab to the outside of the retaining wall. And a guide surface for discharging the water dripping from the draining portion to the outside of the retaining wall. The upper portion of the retaining wall of the pit is closely opposed to the upper surface of the retaining wall. Substructure of seismic isolated building.
て張り出している突縁部を突設し、この突縁部の上方に
キャンチスラブの先端部を位置させていると共に突縁部
の上端面に、キャンチスラブの先端部下面に設けている
水切り部から滴下する水を擁壁外に排出する案内面を形
成していることを特徴とする請求項１に記載の免震建築
物の下部構造。2. A projecting edge portion protruding toward the inside of the pit is provided at the upper end of the retaining wall of the pit, and the tip of the cantilever slab is located above the projecting edge portion and the projecting edge portion is formed. The seismic isolated building according to claim 1, wherein the upper end surface is formed with a guide surface for discharging the water dripping from the water draining portion provided on the lower surface of the tip of the cantilever slab to the outside of the retaining wall. Substructure.
て斜め下方に傾斜した傾斜面からなることを特徴とする
請求項１又は請求項２に記載の免震建築物の下部構造。3. The substructure of the seismic isolated building according to claim 1, wherein the guide surface is an inclined surface inclined obliquely downward toward the outer wall surface of the retaining wall of the pit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001281864A JP4638095B2 (en) | 2001-09-17 | 2001-09-17 | Substructure of base-isolated building |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001281864A JP4638095B2 (en) | 2001-09-17 | 2001-09-17 | Substructure of base-isolated building |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003090146A true JP2003090146A (en) | 2003-03-28 |
| JP4638095B2 JP4638095B2 (en) | 2011-02-23 |
Family
ID=19105610
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452999A (en) * | 2013-09-23 | 2015-03-25 | 建研科技股份有限公司 | Self-displacement shock insulation trench system |
| JP2015172291A (en) * | 2014-03-12 | 2015-10-01 | 大成建設株式会社 | Sliding bearing structure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58108015U (en) * | 1982-01-20 | 1983-07-22 | 株式会社竹中工務店 | Waterproof structure for curtain wall side joints applying isobaric theory |
| JPH11131601A (en) * | 1997-11-04 | 1999-05-18 | Yurugi Kensetsu Kk | Base isolation building with clearance intercepting device inserted in it |
| JP2000145200A (en) * | 1998-11-05 | 2000-05-26 | Soken Sekkei:Kk | Aspect-ratio vibration-isolation device |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104452999A (en) * | 2013-09-23 | 2015-03-25 | 建研科技股份有限公司 | Self-displacement shock insulation trench system |
| CN104452999B (en) * | 2013-09-23 | 2016-08-10 | 建研科技股份有限公司 | Self-displacement shock insulation trench system |
| JP2015172291A (en) * | 2014-03-12 | 2015-10-01 | 大成建設株式会社 | Sliding bearing structure |
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| JP4638095B2 (en) | 2011-02-23 |
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