JP6291288B2 - Retaining wall structure - Google Patents

Retaining wall structure Download PDF

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JP6291288B2
JP6291288B2 JP2014040031A JP2014040031A JP6291288B2 JP 6291288 B2 JP6291288 B2 JP 6291288B2 JP 2014040031 A JP2014040031 A JP 2014040031A JP 2014040031 A JP2014040031 A JP 2014040031A JP 6291288 B2 JP6291288 B2 JP 6291288B2
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wall
plate
seismic isolation
surrounding ground
building
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JP2015165067A (en
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前川 利雄
利雄 前川
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Kumagai Gumi Co Ltd
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建物の免震化のために地下に設けられる免震ピットの擁壁の構造に関する。   It relates to the structure of the retaining wall of the seismic isolation pit that is installed in the basement for seismic isolation.

従来、建物に対する地震対策のため、地盤と建物との間に積層ゴムアイソレーターのような複数の免震装置を配置することが行われている。免震装置は、掘り下げられた地盤上に形成された底盤とこれと一体をなす、矩形の四辺に沿って伸びる擁壁とが規定する免震ピット内に設置される。これによれば、地震の発生時、免震装置の働きにより、該免震装置上に支持された建物(免震建物)に生じる水平変位の大きさ及び加速度が制限され、該建物の揺れが緩和される。   2. Description of the Related Art Conventionally, a plurality of seismic isolation devices such as laminated rubber isolators are arranged between a ground and a building for earthquake countermeasures against the building. The seismic isolation device is installed in a seismic isolation pit defined by a bottom formed on the ground dug down and a retaining wall extending along the four sides of the rectangle. According to this, at the time of the occurrence of an earthquake, the magnitude and acceleration of the horizontal displacement generated in the building (base isolation building) supported on the base isolation device is limited by the operation of the base isolation device, and the shaking of the building is limited. Alleviated.

ところで、発生する地震の規模が設計上の想定規模を大きく上回ると、建物の水平変位の大きさ及びその加速度の大きさが設計上の想定の範囲を超え、前記建物の下部が擁壁に衝突し、このために前記建物が損傷し、また、前記建物内の什器の転倒被害や設備機器に対する悪影響が生じ、さらに、居住者が抱く不安感を増大させる。   By the way, if the magnitude of the earthquake that occurs is far greater than the design assumption, the horizontal displacement of the building and the acceleration will exceed the design assumption, and the lower part of the building will collide with the retaining wall. For this reason, the building is damaged, the furniture in the building falls down and the equipment is adversely affected, and the anxiety of residents is increased.

そこで、このような事態が発生したときの対策として、免震装置を取り巻く擁壁の高さを低くして、前記擁壁の外側に前記建物の下部を取り巻く土留壁を設けることが提案されている。この提案においては、想定外の大規模な地震の発生時における建物の衝突対象が前記土留壁とされかつ該土留め壁の一部が衝撃吸収性を備える改良土で構成される(後記特許文献1参照)。   Therefore, as a countermeasure when such a situation occurs, it has been proposed to reduce the height of the retaining wall surrounding the seismic isolation device and to provide a retaining wall surrounding the lower part of the building outside the retaining wall. Yes. In this proposal, a building collision target at the time of an unexpected large-scale earthquake occurs as the retaining wall, and a part of the retaining wall is constituted by improved soil having shock absorption (Patent Documents described later) 1).

特開2012−233362号公報JP 2012-233362 A

本発明の目的は、設計上の想定を大きく上回る規模の地震が発生したときにおける免震ピットの擁壁に対する建物の衝撃を緩和する新たな手段を提供することにある。   An object of the present invention is to provide a new means for mitigating the impact of a building on a retaining wall of a seismic isolation pit when an earthquake having a magnitude far exceeding design assumptions occurs.

本発明は、建物の免震化のために底盤上に設置された複数の免震装置の周囲を取り巻く擁壁の構造に係る。この擁壁の構造は、前記底盤上に載置され矩形の四辺上に位置する4つの壁板と、各壁板を鉛直に支持する支持手段であって周囲地盤に向けての傾倒又は移動を許す支持手段とを含む。   The present invention relates to a structure of a retaining wall that surrounds a plurality of seismic isolation devices installed on a bottom panel for seismic isolation of a building. This retaining wall structure is composed of four wall plates placed on the bottom plate and positioned on the four sides of the rectangle, and supporting means for vertically supporting each wall plate, and tilting or moving toward the surrounding ground. And supporting means for allowing.

本発明によれば、底盤上の各壁板は支持手段によりその周囲地盤の土水圧に抗して鉛直に支持され、前記支持手段に支持された4つの壁板は、免震装置の設置空間である免震ピットを規定する擁壁として機能する。本発明にあっては、設計上の想定を大きく上回る規模の地震の発生に伴って前記免震装置上の建物に大きさ及び加速度が共に過大な水平変位が生じ、このために、前記建物がその外壁の下部において前記擁壁に衝突するとき、衝突を受けた壁板がその周囲地盤に向けて傾倒し又は移動する。前記壁板の傾倒又は移動は、前記建物下部の前記壁板への衝突に伴って生じる衝撃力を緩和する。その結果、前記建物に生じる損傷や、該建物内の什器の転倒被害や設備機器に対する悪影響、居住者が受ける不安感が軽微なものとされる。   According to the present invention, each wall plate on the bottom plate is vertically supported by the support means against the soil water pressure of the surrounding ground, and the four wall plates supported by the support means are installed space for the seismic isolation device. It functions as a retaining wall that defines the seismic isolation pit. In the present invention, with the occurrence of an earthquake that greatly exceeds the design assumptions, the building on the seismic isolation device undergoes an excessive horizontal displacement in both size and acceleration. When colliding with the retaining wall at the lower part of the outer wall, the collided wall plate tilts or moves toward the surrounding ground. The tilting or movement of the wall plate alleviates the impact force that accompanies the collision of the lower part of the building with the wall plate. As a result, the damage that occurs in the building, the falling damage of the fixtures in the building, the adverse effect on the equipment, and the anxiety experienced by the residents are considered to be minor.

前記支持手段は、各壁板と前記底盤とに連結された、前記周囲地盤に向けての傾倒を許すストッパー付きヒンジからなるものとすることができる。これによれば、前記ストッパー付きヒンジはこれが有する一方向への回転のみを許す機能により各壁板を鉛直に支持し、また、各壁板をその周囲地盤へ向けての傾倒を許す。この例においても、さらに、前記4つの壁板を構成する互いに相対する二対の壁板を互いに他の一対の壁板の控えをなすように構成することができる。これによれば、同様に、各壁板のより確実な支持を期待することができる。   The support means may be composed of a hinge with a stopper connected to each wall plate and the bottom plate and allowing tilting toward the surrounding ground. According to this, the hinge with a stopper supports each wall board vertically by the function of allowing only rotation in one direction, and allows the wall board to tilt toward the surrounding ground. In this example as well, the two pairs of wall plates facing each other that constitute the four wall plates can be configured to serve as a pair of other wall plates. According to this, similarly, more reliable support of each wall board can be expected.

また、前記支持手段は、前記底盤上に設けられ該底盤と一体をなす、互いに平行な高さの低い外壁及び高さの高い内壁であって両壁間に各壁板の下端部を受け入れる溝を規定する外壁及び内壁を有するものとすることができる。ここにおいて、各壁板は、前記内壁の上方を前記免震装置に向けて張り出す上部を有するものとされる。   In addition, the support means is a groove provided on the bottom plate and integrally formed with the bottom plate, and has a low parallel outer wall and a high inner wall that receive the lower end of each wall plate between the two walls. It may have an outer wall and an inner wall that define Here, each wall board shall have the upper part which projects the upper direction of the said inner wall toward the said seismic isolation apparatus.

これによれば、各壁板は、前記支持手段を構成する内外の両壁により鉛直に支持される。また、各壁板は、前記内壁の上方を前記免震装置に向けて張り出す上部において、過度な水平変位をしたときの前記建物の下部と衝突する。このとき、各壁板の下端部が両壁間の前記溝内で回転しあるいはさらに前記溝を抜け出し、これにより、各壁板が前記周囲地盤に向けて倒れる。   According to this, each wall board is vertically supported by the inner and outer walls constituting the support means. Moreover, each wall board collides with the lower part of the said building when an excessive horizontal displacement is carried out in the upper part which protrudes above the said inner wall toward the said seismic isolation apparatus. At this time, the lower end part of each wall board rotates in the said groove | channel between both walls, or further escapes from the said groove | channel, and, thereby, each wall board falls toward the said surrounding ground.

各壁板の前記支持手段については、前記控え壁としての2つの壁板と、前記周囲地盤に埋設された複数のアンカー部材又は前記ストッパーヒンジとで構成することができる。   The support means of each wall plate can be constituted by two wall plates as the retaining wall and a plurality of anchor members or the stopper hinges embedded in the surrounding ground.

前記擁壁に接する前記周囲地盤の一部はこれに注入された粘性材料を含むものとすることができる。これによれば、前記周囲地盤が比較的硬いものからなる場合、前記周囲地盤を前記擁壁の近傍において軟弱なものとし、該擁壁を構成する各壁板の傾倒又は移動をより容易なものとすることができる。   A part of the surrounding ground in contact with the retaining wall may include a viscous material injected therein. According to this, when the surrounding ground is made of a relatively hard material, the surrounding ground is made soft in the vicinity of the retaining wall, and each wall plate constituting the retaining wall is more easily tilted or moved. It can be.

4つの壁板と各壁板の支持手段の一例とを示す概略的な平面図である。It is a schematic top view which shows four wall boards and an example of the support means of each wall board. 壁板と、他の例の支持手段と、免震建物とを示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows a wall board, the support means of another example, and a seismic isolation building. 地震発生時における図2の壁板及びその支持手段と、免震建物とを示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the wall board of FIG. 2 at the time of an earthquake occurrence, its support means, and a seismic isolation building. 地震発生時における他の例の壁板及びその支持手段と免震建物とを示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the wall board of the other example at the time of the occurrence of an earthquake, its support means, and a base isolation building. さらに他の例の壁板及びその支持手段と免震建物とを示す部分縦断面図である。It is a fragmentary longitudinal cross-section which shows the wall board of the other example, its support means, and a seismic isolation building.

図1を参照すると、高層ビルのような建物10、該建物の免震化のために地盤を掘り下げて地下に形成された鉄筋コンクリート製の底盤12、及び、底盤12上に設けられた擁壁14の鉛直上方から見たときの概略が示されている。   Referring to FIG. 1, a building 10 such as a high-rise building, a reinforced concrete bottom plate 12 formed underground by digging the ground for seismic isolation of the building, and a retaining wall 14 provided on the bottom plate 12. The outline when viewed from above is shown.

底盤12上の擁壁14は矩形の四辺に沿って伸びている。底盤12及び擁壁14は、積層ゴムアイソレーターのような複数の免震装置16(図2参照。但し、その一つのみを示す。)が設置される免震ピット18の床面及び周面を規定する。建物10はこれらの複数の免震装置16上に支持されている。   The retaining wall 14 on the bottom plate 12 extends along the four sides of the rectangle. The bottom plate 12 and the retaining wall 14 are provided on the floor surface and the peripheral surface of the seismic isolation pit 18 in which a plurality of seismic isolation devices 16 (see FIG. 2, only one of which is shown) such as a laminated rubber isolator are installed. Stipulate. The building 10 is supported on the plurality of seismic isolation devices 16.

本発明にあっては、擁壁14が矩形の立面形状を有する4つの壁板20からなる。これらの4つの壁板20は底盤12上に載置され前記矩形の四辺上にそれぞれ位置する。4つの壁板20は、例えば鉄筋コンクリートからなる。各壁板20は、支持手段22により、その周囲地盤24の土水圧に対抗するように鉛直に支持されている。   In the present invention, the retaining wall 14 is composed of four wall plates 20 having a rectangular vertical surface shape. These four wall plates 20 are placed on the bottom board 12 and positioned on the four sides of the rectangle. The four wall plates 20 are made of reinforced concrete, for example. Each wall plate 20 is supported vertically by the support means 22 so as to oppose the soil water pressure of the surrounding ground 24.

図1に示すところでは、4つの壁板20を構成する互いに相対する二対の壁板20が互いに他の一対の壁板20の控えをなし、前記二対の壁板が互いに他の一対の壁板に対する支持手段22をなしている。   In FIG. 1, two pairs of wall plates 20 that constitute the four wall plates 20 face each other as a pair of other wall plates 20, and the two pairs of wall plates are another pair of wall plates 20. Support means 22 for the wallboard is provided.

すなわち、互いに相対する一対の壁板20(a)、20(d)が、互いに相対する他の一対の壁板20(b)、20(c)の控えをなし、同時に、他の一対の壁板20(b)、20(c)が、一対の壁板20(a)、20(d)の控えをなしている。前記控えの作用により、対をなす2つの壁板20(a)、20(d)のそれぞれ、及び、対をなす2つの壁板20(b)、20(c)のそれぞれが鉛直に支持され、また、周囲地盤24に向けての傾倒又は移動が可能とされている。   That is, a pair of wall plates 20 (a) and 20 (d) facing each other serves as a back-up for another pair of wall plates 20 (b) and 20 (c) facing each other, and at the same time another pair of walls. The plates 20 (b) and 20 (c) form a reserve for the pair of wall plates 20 (a) and 20 (d). By the action of the stay, each of the two wall plates 20 (a) and 20 (d) making a pair and each of the two wall plates 20 (b) and 20 (c) making a pair are vertically supported. In addition, tilting or moving toward the surrounding ground 24 is possible.

前記控えの作用を得るために、図示の例にあっては、相対する一対の壁板20(a)、20(d)の内の一方の壁板20(a)の両側部に上下方向へ伸びる一対の切り欠き26が設けられ、他方の壁板20(d)の両側部には何も設けられていない。また、他の一対の壁板20(c)、20(d)のそれぞれの両側部の内の一方の側部のみに上下方向へ伸びる同様の切り欠き26が設けられている。各切り欠き26は、壁板20の内壁面の一部及び側面の一部を鉤形に切り欠いてなる。   In order to obtain the effect of the recording, in the example shown in the drawing, the vertical direction is applied to both side portions of one wall plate 20 (a) of the pair of opposing wall plates 20 (a) and 20 (d). A pair of extending cutouts 26 are provided, and nothing is provided on both sides of the other wall plate 20 (d). Moreover, the same notch 26 extended to an up-down direction is provided only in one side part of each side part of another pair of wall board 20 (c), 20 (d). Each notch 26 is formed by notching part of the inner wall surface and part of the side surface of the wall plate 20 into a bowl shape.

一対の壁板20(a)、20(d)の内の一方の壁板20(a)は、その両側部の切り欠き26に、他の一対の壁板20(b)、20(c)の側部の一部分を受け入れている。また、一対の壁板20(a)、20(d)の内の他の一方の壁板20(d)は、その両側部の一部分において、他の一対の壁板20(b)、20(c)の一側部の切り欠き26に受け入れられている。   One wall plate 20 (a) of the pair of wall plates 20 (a) and 20 (d) is provided with the other pair of wall plates 20 (b) and 20 (c) in the notches 26 on both sides thereof. Accepts part of the side. The other wall plate 20 (d) of the pair of wall plates 20 (a), 20 (d) has a pair of other wall plates 20 (b), 20 ( c) is received in a cutout 26 on one side.

前記控えの作用を得るために、図1に示す例のほか、例えば、各壁板20(a〜d)の一側部に前記切り欠きを設けたものとすることができる。この例にあっては、壁板20(a)の切り欠きに壁板20(c)の他側部の一部分が受け入れられ、壁板20(c)の切り欠きに壁板20(d)の他側部の一部分が受け入れられ、壁板20(d)の切り欠きに壁板(b)の他側部の一部分が受け入れられ、かつ、壁板20(b)の切り欠きに壁板(a)の他側部の一部分が受け入れられる。あるいは、また、前記した例のほか、例えば、互いに相対する一対の壁板20(a)、20(d)のそれぞれの両側部に前記切り欠きを設け、他方、他の一対の壁板20(b)、20(c)のそれぞれの両側部には何も設けないものとすることができる。この例にあっては、壁板20(a)の一側部の切り欠きとこれに相対する壁板20(d)の一側部の切り欠きとに、前記切り欠きが設けられていない他の壁板20(b)の両側部の一部分がそれぞれ受け入れられ、また、壁板20(a)の他側部の切り欠きとこれに相対する壁板20(d)の他側部の切り欠きとに、他の壁板20(c)の両側部の一部分がそれぞれ受け入れられる。 In addition to the example shown in FIG. 1, for example, the notch may be provided on one side of each wall plate 20 (a to d) in order to obtain the effect of the recording. In the example, a portion of the other side is accepted in wall plate into the notch of the wall plate 20 (a) 20 (c) , wall plate 20 to the notch of the wall plate 20 (c) of (d) A part of the other side is received, a part of the other side of the wall plate (b) is received in the notch of the wall plate 20 (d), and a wall plate (a ) Part of the other side is accepted. Alternatively, in addition to the above-described example, for example, the notches are provided on both side portions of a pair of wall plates 20 (a) and 20 (d) facing each other, while the other pair of wall plates 20 ( Nothing can be provided on both sides of each of b) and 20 (c). In this example, the cutout on one side of the wall plate 20 (a) and the cutout on one side of the wall plate 20 (d) opposite thereto are not provided with the cutout. A part of each side of the wall plate 20 (b) is received, and a notch on the other side of the wall plate 20 (a) and a notch on the other side of the wall plate 20 (d) opposite to the notch. In addition, a part of each side portion of the other wall plate 20 (c) is received.

なお、周囲地盤24の土水圧を受ける図示の各壁板20(a〜d)は一定の厚さ寸法を有するものであり、このため、各壁板は前記矩形の各辺の伸長方向における中央部において最も大きく撓む。この撓みをより小さいものとするため、各壁板20(a〜d)がその両側部から前記中央部に向けてそれぞれ漸増する厚さ寸法を有するものとすることができる。   The illustrated wall plates 20 (a to d) that receive the earth and water pressure of the surrounding ground 24 have a certain thickness, and for this reason, each wall plate is a center in the extending direction of each side of the rectangle. It bends most in the part. In order to make this bending smaller, each of the wall plates 20 (a to d) can have a thickness dimension that gradually increases from both side portions toward the central portion.

各壁板20の支持手段22は、図1に示すものに代えて、以下に説明する図2に示すもの、図4に示すもの、又は、図5に示すものとすることができる。また、支持手段22は、これらのものに代えて、図1に示すものと図2に示すものとの組み合わせからなるもの、図1に示すものと図4に示すものとの組み合わせからなるものとすることができる。   The support means 22 of each wall plate 20 can be the one shown in FIG. 2, the one shown in FIG. 4, or the one shown in FIG. Further, instead of these, the support means 22 is composed of a combination of the one shown in FIG. 1 and the one shown in FIG. 2, or a combination of the one shown in FIG. 1 and the one shown in FIG. can do.

図2及び図3を参照すると、4つの壁板20の内の任意の1つの壁板20と、これを支持する他の例に係る支持手段22とが示されている。なお、壁板20には、図1に示す例におけるような切り欠き26は設けられていない。   Referring to FIGS. 2 and 3, any one of the four wall plates 20 and support means 22 according to another example for supporting the wall plates 20 are shown. The wall plate 20 is not provided with a notch 26 as in the example shown in FIG.

図2及び図3に示す支持手段22は、各壁板20に連結されかつその背後の周囲地盤24に埋設された複数のアンカー部材28からなる。各アンカー部材28は壁板20に埋設された板状の一端部28aと、周囲地盤24に埋設された板状又は円筒状の他端部28bとを有し、また、一端部28aから他端部28bに向けて斜め下方へ伸びる線状の中間部28cを有する。アンカー部材28は周囲地盤24に接する壁板20に引張り力を及ぼし、これを鉛直に支持する。また、アンカー部材28は各壁板20が周囲地盤24に向けて倒れ又は移動することを許す。なお、各壁板20は例えば発泡スチロール製のシート片30を介して底盤12上に載置することができる。   The support means 22 shown in FIG.2 and FIG.3 consists of the some anchor member 28 connected with each wall board 20 and embed | buried in the surrounding ground 24 behind it. Each anchor member 28 has a plate-like one end portion 28 a embedded in the wall plate 20 and a plate-like or cylindrical other end portion 28 b embedded in the surrounding ground 24, and the other end from the one end portion 28 a to the other end. A linear intermediate portion 28c extending obliquely downward toward the portion 28b is provided. The anchor member 28 exerts a tensile force on the wall plate 20 in contact with the surrounding ground 24 and supports it vertically. In addition, the anchor member 28 allows each wall plate 20 to fall or move toward the surrounding ground 24. In addition, each wall board 20 can be mounted on the bottom board 12 via the sheet piece 30 made from a polystyrene foam, for example.

図2示す例、また、図1に示す例については、前記矩形の各辺に沿って伸びる軸線を有する複数のヒンジ(図示せず)を介して、各壁板20を前記ヒンジの軸線の周りに回転可能であるように、底盤12に連結することができる。この例にあっては、支持手段22は、各壁板20の周囲地盤28に向けての傾倒のみを許す。 In the example shown in FIG. 2 and the example shown in FIG. 1, each wall plate 20 is connected to the axis of the hinge via a plurality of hinges (not shown) having axes extending along the sides of the rectangle. It can be connected to the base 12 so that it can rotate around. In this example, the support means 22 only allows the wall plate 20 to tilt toward the surrounding ground 28.

免震装置16上に支持された建物10は、図1及び図2のいずれの例においても、設計上想定された範囲内の規模の地震が発生したとき、免震装置16の働きにより、互いに相対する壁板20相互間において水平方向に変位する。他方、前記地震の規模が設計上の想定を超える大きさであるとき、建物20は過大にまたより大きい加速度をもって水平に変位する。その結果、建物10の下部が壁板20に衝突する。   The buildings 10 supported on the seismic isolation device 16 are connected to each other by the operation of the seismic isolation device 16 when an earthquake of a scale within the range assumed in the design occurs in both the examples of FIGS. 1 and 2. It is displaced in the horizontal direction between the opposing wall plates 20. On the other hand, when the magnitude of the earthquake exceeds a design assumption, the building 20 is displaced horizontally with an excessively larger acceleration. As a result, the lower part of the building 10 collides with the wall plate 20.

この状況について、図3を参照して代表的に説明すると、衝突を受けた壁板20が周囲地盤24に向けて傾倒し、あるいは周囲地盤24を押し退けるように移動する(図示せず)。図3に示すところでは、壁板20が傾倒し、その周囲地盤24が複数のアンカー部材28と共に押し退けられている。このときの壁板20の傾倒又は移動により、建物10の壁板20に対する衝突に伴う衝撃力が緩和され、建物10に生じる損傷の程度や、該建物内の什器の転倒被害や設備機器に対する悪影響、居住者が受ける不安感が低減される。   This situation will be described representatively with reference to FIG. 3. The wall plate 20 that has received the collision is tilted toward the surrounding ground 24 or moved so as to push away the surrounding ground 24 (not shown). In the place shown in FIG. 3, the wall plate 20 is tilted, and the surrounding ground 24 is pushed away together with the plurality of anchor members 28. By tilting or moving the wall plate 20 at this time, the impact force associated with the collision of the building 10 with the wall plate 20 is alleviated, and the degree of damage occurring in the building 10, the falling damage of the fixtures in the building, and the adverse effects on the equipment and equipment. The anxiety experienced by residents is reduced.

各壁板20の支持手段22は、前記した例に代えて、図4に示すものとすることができる。図4に示す支持手段22は、複数のストッパー付きヒンジ32からなる。複数のストッパー付きヒンジ32はこれらの軸線が前記矩形の各辺に沿って伸びるように配置されている。各壁板20は複数のストッパー付きヒンジ32を介して、直立した状態から周囲地盤24に向けて回転可能であるように、底盤12に連結されている。図4は、想定外の規模の地震が生じたときに建物10がその下部において壁板20に衝突し、該壁板がストッパーヒンジ32の軸線の周りに回転して、周囲地盤24に向けて傾倒した状態を示す。前記したと同様に、壁板20の傾倒により、壁板20に対する建物10の衝撃力が緩和される。   The support means 22 of each wall plate 20 can be the one shown in FIG. 4 instead of the above example. The support means 22 shown in FIG. 4 includes a plurality of hinges 32 with stoppers. The plurality of hinges 32 with stoppers are arranged so that their axes extend along each side of the rectangle. Each wall plate 20 is connected to the bottom plate 12 through a plurality of hinges 32 with stoppers so as to be rotatable from an upright state toward the surrounding ground 24. FIG. 4 shows that when an earthquake of an unexpected magnitude occurs, the building 10 collides with the wall plate 20 in the lower part, and the wall plate rotates around the axis of the stopper hinge 32 toward the surrounding ground 24. Indicates tilted state. As described above, the impact force of the building 10 against the wall plate 20 is reduced by the inclination of the wall plate 20.

なお、建物10と各壁板20とにこれら相互の想定される衝突箇所に衝撃吸収能を有するシート片34を貼り付けておくことができる。これによれば、壁板20に建物10が衝突したときに生じる衝撃力をより一層緩和することができる。前記シート片34の貼付は、図1に示す例、図2に示す例及び後述する図5に示す例においても、同様に適用可能である。また、擁壁14を構成する各壁板20に接する周囲地盤24の一部をこれに注入された粘性材料36を含むものすることができる。これにより、周囲地盤24が比較的高い硬度を有する場合には該周囲地盤をより変形し易い軟弱なものとすることができ、周囲地盤24に対する各壁板20の傾倒又は移動をより容易なものとすることができる。周囲地盤24の一部への粘性材料36の注入も、また、図1に示す例、図2に示す例及び後述する図5に示す例に同様に適用可能である。   In addition, the sheet | seat piece 34 which has an impact-absorbing ability can be affixed on the building 10 and each wall board 20 in the collision location where these mutually assume. According to this, the impact force generated when the building 10 collides with the wall plate 20 can be further alleviated. The sticking of the sheet piece 34 can be similarly applied to the example shown in FIG. 1, the example shown in FIG. 2, and the example shown in FIG. In addition, a part of the surrounding ground 24 in contact with each wall plate 20 constituting the retaining wall 14 can include the viscous material 36 injected into this. As a result, when the surrounding ground 24 has a relatively high hardness, the surrounding ground can be more easily deformed, and the wall plates 20 can be more easily tilted or moved with respect to the surrounding ground 24. It can be. The injection of the viscous material 36 into a part of the surrounding ground 24 is also applicable to the example shown in FIG. 1, the example shown in FIG. 2, and the example shown in FIG.

支持手段22は、また、図5に示すようなものとすることができる。   The support means 22 can also be as shown in FIG.

図5に示す支持手段22は、底盤12上に設けられ該底盤と一体をなす、互いに平行な高さの低い外壁38と高さの高い内壁40とからなる。外内の両支持壁38、40はこれらの間に各壁板20の下端部42を受け入れる浅い溝44を規定する。ここにおいて、各側板20は高さの高い内壁40の上方を免震装置16に向けて、すなわち免震ピット18内に張り出す上部46を備える。   The support means 22 shown in FIG. 5 includes an outer wall 38 having a low height and an inner wall 40 having a high height, which are provided on the bottom plate 12 and are integrated with the bottom plate. Both outer and inner support walls 38, 40 define a shallow groove 44 between them for receiving the lower end 42 of each wall plate 20. Here, each side plate 20 is provided with an upper portion 46 that projects upward from the high inner wall 40 toward the seismic isolation device 16, that is, into the seismic isolation pit 18.

この例によれば、各壁板20は外内の両支持壁38、40により鉛直に支持され、背後の周囲地盤24の土水圧に対抗する。また、各壁板20の上部46は内壁40の上方を乗り越えて突出していることから、建物10に過大な水平変位が生じたとき、壁板20はその上部において建物10に衝突する。壁板20は、前記した例におけると同様、前記衝突により周囲地盤24に向けて倒れ、これにより建物10に生じる衝撃力が緩和される。なお、図2に示す例におけると同様、溝44の底に発泡スチロール製のシート片30をおき、この上に各壁板20を載置することができる。   According to this example, each wall board 20 is vertically supported by both outer and inner support walls 38 and 40, and opposes the soil water pressure of the surrounding ground 24 behind. Moreover, since the upper part 46 of each wall board 20 protrudes over the upper part of the inner wall 40, when an excessive horizontal displacement arises in the building 10, the wall board 20 collides with the building 10 in the upper part. As in the above example, the wall plate 20 falls toward the surrounding ground 24 due to the collision, and thereby the impact force generated in the building 10 is alleviated. As in the example shown in FIG. 2, a sheet piece 30 made of polystyrene foam is placed on the bottom of the groove 44, and each wall plate 20 can be placed thereon.

10 建物
12 底盤
14 擁壁
16 免震装置
18 免震ピット
20 壁板
22 支持手段
24 周囲地盤
28 アンカー部材
32 ストッパー付きヒンジ
36 粘性材料
38、40 外壁及び内壁
42 壁板の下端部
44 溝
46 壁板の上部
DESCRIPTION OF SYMBOLS 10 Building 12 Bottom board 14 Retaining wall 16 Seismic isolation device 18 Seismic isolation pit 20 Wall board 22 Support means 24 Surrounding ground 28 Anchor member 32 Hinge with stopper 36 Viscous material 38, 40 Outer wall and inner wall 42 Lower end part 44 of wall board Groove 46 Wall Top of board

Claims (4)

建物の免震化のために底盤上に設置された複数の免震装置の周囲を取り巻く擁壁の構造であって、
前記盤上に載置され矩形の四辺上に位置する4つの壁板と、
各壁板をその周囲地盤の土水圧に抗して鉛直に支持し、また、各壁板の前記周囲地盤に向けての傾倒又は移動を許す支持手段とを含み、
前記支持手段は、各壁板と前記底盤とに連結された、前記周囲地盤に向けての傾倒を許すストッパー付きヒンジからなる、擁壁の構造。
A structure of a retaining wall that surrounds a plurality of seismic isolation devices installed on the bottom for seismic isolation of the building,
Four wall plates placed on the bottom plate and positioned on four sides of the rectangle;
Each wallboard supporting vertically against the soil water pressure surrounding ground, also saw including a support means to allow tilting or moving toward the periphery ground of each wall plate,
The support means is a retaining wall structure comprising a hinge with a stopper that is connected to each wall plate and the bottom plate and allows tilting toward the surrounding ground .
前記4つの壁板を構成する互いに相対する二対の壁板は互いに他の一対の壁板の控えをなす、請求項に記載の擁壁の構造。 2. The retaining wall structure according to claim 1 , wherein two pairs of opposite wall plates constituting the four wall plates form a reserve of the other pair of wall plates. 建物の免震化のために底盤上に設置された複数の免震装置の周囲を取り巻く擁壁の構造であって、
前記底盤上に載置され矩形の四辺上に位置する4つの壁板と、
各壁板をその周囲地盤の土水圧に抗して鉛直に支持し、また、各壁板の前記周囲地盤に向けての傾倒又は移動を許す支持手段とを含み、
前記支持手段は、前記底盤上に設けられ該底盤と一体をなす、互いに平行な高さの低い外壁及び高さの高い内壁であって両壁間に各壁板の下端部を受け入れる溝を規定する外壁及び内壁を有し、
各壁板は、前記内壁の上方を前記免震装置に向けて張り出す上部を有する、擁壁の構造。
A structure of a retaining wall that surrounds a plurality of seismic isolation devices installed on the bottom for seismic isolation of the building,
Four wall plates placed on the bottom plate and positioned on four sides of the rectangle;
Supporting each wall plate vertically against the earth and water pressure of its surrounding ground, and supporting means for allowing each wall plate to tilt or move toward the surrounding ground,
The supporting means defines a groove provided on the bottom plate and integrally formed with the bottom plate, the outer wall having a low height and the inner wall having a high height and receiving the lower end of each wall plate between the two walls. An outer wall and an inner wall
Each wall plate has a retaining wall structure having an upper portion projecting above the inner wall toward the seismic isolation device .
前記擁壁に接する前記周囲地盤の一部がこれに注入された粘性材料を含む、請求項1〜のいずれか1項に記載の擁壁の構造。 The structure of the retaining wall according to any one of claims 1 to 3 , wherein a part of the surrounding ground in contact with the retaining wall includes a viscous material injected therein.
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