JP2807696B2 - Underground structure - Google Patents
Underground structureInfo
- Publication number
- JP2807696B2 JP2807696B2 JP2252887A JP25288790A JP2807696B2 JP 2807696 B2 JP2807696 B2 JP 2807696B2 JP 2252887 A JP2252887 A JP 2252887A JP 25288790 A JP25288790 A JP 25288790A JP 2807696 B2 JP2807696 B2 JP 2807696B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- water
- underground structure
- skeleton
- liquefaction
- 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.)
- Expired - Lifetime
Links
Landscapes
- Foundations (AREA)
- Underground Structures, Protecting, Testing And Restoring Foundations (AREA)
Description
【発明の詳細な説明】 「産業上の利用分野」 本発明は、地盤が液状化することによる浮き上がりや
沈下等の被害を防止し得る地中構造物に関するものであ
る。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underground structure capable of preventing damage such as rising and sinking due to liquefaction of the ground.
「従来の技術およびその課題」 周知のように、地震時に地盤が液状化して構造物が浮
き上がったり沈下したりする災害が発生しており、その
対策として、サンドコンパクション工法やバイブロフロ
ーテーション工法等により地盤を締め固めることが広く
行なわれているが、それらの工法では振動や騒音の発生
が避けられず、特に市街地での実施は困難である。ま
た、市街地でも実施可能な他の工法としてグラベルドレ
ーン工法や地盤をセメントにより固化してしまう工法が
あるが、それらは工費がかさむとともに必ずしも十分な
効果が得られない場合もある。"Conventional technology and its problems" As is well known, disasters occur when the ground liquefies and structures rise or sink during an earthquake, and as a countermeasure, the sand compaction method, vibro flotation method, etc. Compaction of the ground is widely practiced, but these construction methods inevitably generate vibrations and noises, and are particularly difficult to implement in urban areas. There are other methods that can be implemented in urban areas, such as the gravel drain method and the method of solidifying the ground with cement. However, these methods increase the cost and may not always provide a sufficient effect.
本発明は上記の事情に鑑みてなされたもので、地盤の
液状化による浮き上がりや沈下等の被害を有効に防止し
得る地中構造物を提供することを目的とする。The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an underground structure capable of effectively preventing damage such as uplift and settlement due to liquefaction of the ground.
「課題を解決するための手段」 本発明は、地盤が液状化することによる浮き上がりや
沈下等の被害を防止し得る地中構造物であって、地中に
設けられた躯体の周囲に地表から不透水層に達する止水
壁を設けて、この止水壁と前記躯体の壁面とをアスファ
ルト層を介して密接させてなることを特徴とするもので
ある。"Means for Solving the Problems" The present invention is an underground structure capable of preventing damage such as uplift and subsidence due to liquefaction of the ground, and is provided from the ground surface around a frame provided underground. The present invention is characterized in that a water-stop wall reaching the water-impermeable layer is provided, and the water-stop wall and the wall surface of the frame are brought into close contact with each other via an asphalt layer.
「作用」 本発明の地中構造物は、止水壁によって躯体の周囲の
地下水が流入してくることが防止される。また、止水壁
の剛性により構造物下部および周囲での地盤の液状化が
生じ難くなるとともに、仮に液状化が生じたとしても構
造物底面部の水圧上昇は構造物の接地圧以下に低く抑え
られるので浮き上がり現象は生じず、大きな被害に至る
ことが防止される。止水壁と躯体壁面との間に介装され
たアスファルト層は底面からの水および土砂の噴出を防
ぐとともに粘弾性材としての性質を有しているので、地
震時には弾性材として作用して躯体の急激な変位に対し
て抵抗力を発揮して浮き上がりや沈下を抑制する。ま
た、長期的には粘性体として作用し、地震後の水圧の消
散に伴う躯体の変位を拘束しないので、地震後は常に構
造物は底面で支持された状態になる。[Operation] In the underground structure of the present invention, the water blocking wall prevents the groundwater around the skeleton from flowing in. In addition, the rigidity of the water blocking wall makes it difficult for the ground to liquefy under and around the structure, and even if liquefaction occurs, the water pressure rise at the bottom of the structure is kept below the ground pressure of the structure. As a result, the floating phenomenon does not occur, and it is possible to prevent serious damage. The asphalt layer interposed between the water stop wall and the skeleton wall prevents water and earth and sand from escaping from the bottom surface and has the property of a viscoelastic material. Floats and sinks are suppressed by exhibiting resistance to sudden displacement of In addition, it acts as a viscous material in the long term and does not restrain the displacement of the skeleton due to the dissipation of water pressure after the earthquake, so that the structure is always supported by the bottom surface after the earthquake.
「実施例」 以下、本発明の一実施例を第１図および第２図を参照
して説明する。Embodiment An embodiment of the present invention will be described below with reference to FIG. 1 and FIG.
これらの図において符号１は液状化を生じる恐れのあ
る地盤２中に設けられて共同溝として用いられる鉄筋コ
ンクリート造の躯体、３は地表より不透水層（粘土層）
４に達するように設けらられたたとえば鉄筋コンクリー
ト造の剛性の高い止水壁、５は躯体１の壁面と止水壁3,
3との間に介装されたアスファルト層である。In these figures, reference numeral 1 denotes a reinforced concrete frame provided in the ground 2 where liquefaction may occur and used as a common ditch, and 3 denotes an impermeable layer (clay layer) from the ground surface.
4 is a rigid water-blocking wall made of, for example, reinforced concrete, and 5 is a wall of the frame 1 and a water-blocking wall 3,
It is an asphalt layer interposed between 3.
上記のように、躯体１の外側に不透水層４に達する止
水壁3,3を設けた構成の地中構造物にあっては、地盤２
の液状下による躯体１の浮き上がりや沈下といった被害
を有効に防止できるものである。As described above, in the underground structure having the water blocking walls 3 reaching the impermeable layer 4 outside the frame 1, the ground 2
This can effectively prevent damage such as lifting or sinking of the skeleton 1 due to the under liquid.
すなわち、躯体１は止水壁3,3が囲まれているため止
水壁3,3の外側で液状化が生じても躯体１の周囲に地下
水が流入してくることが防止される。また、止水壁3,3
内部の液状化による水圧上昇は止水壁3,3による外部と
の遮断により低く抑えられる。そして、なお、躯体１が
わずかでも浮き上がれば止水壁3,3の内側における水圧
は急激に低下してしまうから、それ以上の浮き上がりが
生じることがなく、したがって大きな被害に至ることが
防止される。That is, since the skeleton 1 is surrounded by the water blocking walls 3, 3, even if liquefaction occurs outside the water blocking walls 3, 3, groundwater is prevented from flowing around the skeleton 1. In addition, water stop wall 3,3
The rise in water pressure due to liquefaction inside is suppressed low by the cutoff walls 3, 3 blocking the outside. In addition, if the frame 1 rises even slightly, the water pressure inside the water blocking walls 3, 3 will drop sharply, so that no further lifting will occur, and therefore, serious damage will be prevented. You.
また、止水壁3,3の剛性が高いので、地震時に地盤２
に加わる剪断変形が止水壁3,3の剛性により低減させら
れ、これによっても地盤２の液状化が生じ難くなるとい
う利点もあり、この点で、止水壁3,3の剛性を高めてお
くことが望ましい。In addition, because the rigidity of the water blocking walls 3, 3 is high, the ground 2
Is reduced by the rigidity of the water blocking walls 3, 3 and the liquefaction of the ground 2 is less likely to occur. In this respect, the rigidity of the water blocking walls 3, 3 is increased. It is desirable to keep.
さらに、アスファルト層５は躯体１壁面の防水層とし
て作用することは勿論であるが、アスファルトは粘弾性
材としての性質を有しているので、アスファルト層５は
長期的には粘性体として作用して躯体１の変位を拘束せ
ず、したがって常時においては躯体１の荷重は止水壁3,
3に伝達されることはないが、アスファルト層５は地震
時には弾性材として作用して躯体１の急激な変位に対し
て抵抗力を発揮する。Further, the asphalt layer 5 naturally functions as a waterproof layer on the wall surface of the frame 1, but since the asphalt has properties as a viscoelastic material, the asphalt layer 5 functions as a viscous material in the long term. Does not restrict the displacement of the skeleton 1, and therefore the load of the skeleton 1 is always
Although not transmitted to 3, the asphalt layer 5 acts as an elastic material during an earthquake and exerts a resistance against a sudden displacement of the frame 1.
なお、止水壁3,3に加わる土圧はアスファルト層5,5を
介して躯体１に伝達されることになる。また、この止水
壁3,3は、止水を主目的として設けることでも勿論良い
が、不透水層４に達するものであれば仮設の山止めを転
用することも可能である。The earth pressure applied to the water blocking walls 3, 3 is transmitted to the frame 1 via the asphalt layers 5, 5. In addition, it is of course possible to provide the water blocking walls 3 and 3 mainly for water blocking, but it is also possible to divert a temporary yard stop as long as it reaches the water impermeable layer 4.
以上のように、上記実施例の地中構造物では、地盤２
の液状化による被害を有効に防止することができるもの
であり、そして、地盤２に対する締め固め等の改良作業
が不要であるので、サンドコンパクション工法やバイブ
ロフローテーション工法等の締め固め工法を実施する場
合のように騒音や振動を発生することはないし、また、
工費の点でも有利である。As described above, in the underground structure of the above embodiment, the ground 2
Since it is possible to effectively prevent damage due to liquefaction of the ground, and because improvement work such as compaction of the ground 2 is unnecessary, compaction methods such as sand compaction method and vibro flotation method are performed. It does not generate noise or vibration as in the case,
It is also advantageous in terms of construction costs.
なお、アスファルトの代わりに柔らかい粘土などを代
用しても類似の効果を得ることが可能である。また、上
記実施例は共同溝に適用したものであるが、他の一般の
地中構造物や、地下階を有する建築物の地階部分に対し
ても全く同様に適用できることはいうまでもない。A similar effect can be obtained by substituting soft clay or the like instead of asphalt. Although the above embodiment is applied to a common ditch, it goes without saying that it can be applied to other general underground structures and the ground floor portion of a building having an underground floor.
「発明の効果」 以上で詳細に説明したように、本発明の地中構造物
は、地中に設けられた躯体の周囲に地表から不透水層に
達する止水壁を設けた構成であるから、止水壁の外側で
液状化が生じても躯体の周囲に地下水が流入してくるこ
とが防止され、このため、止水壁の内側での液状化が生
じ難くなるとともに仮に液状化が生じたとしてもその水
圧上昇は低く抑えられ、かつ、躯体がわずかでも浮き上
がれば止水壁の内側における水圧は急激に低下してしま
うから、それ以上の浮き上がりが生じることがなく、し
たがって大きな被害に至ることを防止できる。また、止
水壁と躯体の壁面とをアスファルト層を介して密接させ
た構成であるから、アスファルト層の粘弾性材としての
性質により地震時にはアスファルト層が躯体の変位に対
して抵抗力を発揮する、という利点もある。[Effects of the Invention] As described in detail above, the underground structure of the present invention has a structure in which a water blocking wall that reaches an impermeable layer from the ground surface is provided around a frame provided in the ground. Therefore, even if liquefaction occurs outside the water blocking wall, groundwater is prevented from flowing around the skeleton, so that liquefaction hardly occurs inside the water blocking wall and liquefaction occurs temporarily. Even if the rise in water pressure is kept low, and even if the skeleton rises even slightly, the water pressure inside the water stop wall will drop sharply, so no further rise will occur, and therefore severe damage will occur. Can be prevented. In addition, since the water blocking wall and the wall of the skeleton are closely connected via the asphalt layer, the asphalt layer exhibits resistance to the displacement of the skeleton during an earthquake due to the properties of the asphalt layer as a viscoelastic material. There is also an advantage that.
第１図および第２図は本発明を共同溝として用いる地中
構造物に適用した場合の一実施例を示すもので、第１図
は立断面図、第２図は平面図である。 １……躯体、２……地盤、３……止水壁、４……不透水
層、５……アスファルト層。1 and 2 show an embodiment in which the present invention is applied to an underground structure using a common ditch. FIG. 1 is a vertical sectional view, and FIG. 2 is a plan view. 1 ... frame, 2 ... ground, 3 ... water barrier, 4 ... water-impermeable layer, 5 ... asphalt layer.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 渡辺 俊雄 東京都中央区京橋２丁目16番１号 清水 建設株式会社内 (72)発明者 大西 雄二 東京都中央区京橋２丁目16番１号 清水 建設株式会社内 (56)参考文献 特開 平２−140318（ＪＰ，Ａ) 特開 昭52−33308（ＪＰ，Ａ) (58)調査した分野(Int.Cl.6，ＤＢ名) E02D 27/34 E01D 31/02────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Toshio Watanabe 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Yuji 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction (56) References JP-A-2-140318 (JP, A) JP-A-52-33308 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) E02D 27/34 E01D 31/02
Claims (1)
沈下等の被害を防止し得る地中構造物であって、地中に
設けられた躯体の周囲に地表から不透水層に達する止水
壁を設けて、この止水壁と前記躯体の壁面とをアスファ
ルト層を介して密接させてなることを特徴とする地中構
造物。An underground structure capable of preventing damage such as uplift and subsidence due to liquefaction of the ground, and a water stop wall extending from the surface of the ground to an impermeable layer around a frame provided in the ground. And an underground structure wherein the water stop wall and the wall surface of the skeleton are brought into close contact with each other via an asphalt layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2252887A JP2807696B2 (en) | 1990-09-21 | 1990-09-21 | Underground structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2252887A JP2807696B2 (en) | 1990-09-21 | 1990-09-21 | Underground structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04131430A JPH04131430A (en) | 1992-05-06 |
| JP2807696B2 true JP2807696B2 (en) | 1998-10-08 |
Family
ID=17243544
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2252887A Expired - Lifetime JP2807696B2 (en) | 1990-09-21 | 1990-09-21 | Underground structure |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2807696B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2706407B2 (en) * | 1992-08-26 | 1998-01-28 | 東京瓦斯株式会社 | Water stopping method for underground storage tank structure |
-
1990
- 1990-09-21 JP JP2252887A patent/JP2807696B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04131430A (en) | 1992-05-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP2807696B2 (en) | Underground structure | |
| JPS62260919A (en) | Small pile for reinforcing foundation ground to earthquake | |
| JP4315620B2 (en) | Impermeable treatment method for managed waste landfill revetment | |
| JP2725516B2 (en) | Liquefaction countermeasures for buried structures | |
| JP2814898B2 (en) | Underground storage facility | |
| JPH02213522A (en) | Method of constructing foundations for structures in sandy soil layers | |
| JPH04131429A (en) | Underground structure | |
| JPH0352256Y2 (en) | ||
| JPH01278612A (en) | Method of taking countermeasure against liquefaction of linear structure buried in ground | |
| JP2668922B2 (en) | Seismic structure of excavated road | |
| JP2612763B2 (en) | Basic structure of structure | |
| JPS61146910A (en) | Liquefaction prevention method for sandy ground | |
| JP2524537B2 (en) | Foundation structure of underground structure | |
| JP2524536B2 (en) | Foundation structure of underground structure | |
| JPH03275813A (en) | Method for coping with liquefaction of embedded structure | |
| JPH0536044Y2 (en) | ||
| JPH01226920A (en) | Earthquake-resistant structure of river embankments | |
| JP2813835B2 (en) | Earthquake countermeasure construction method of underground structure installed in liquefied ground under pavement | |
| JPH10131208A (en) | Construction method for preventing ground from lateral flow | |
| JP3431905B2 (en) | Improved soil structure of sandy soil layer and improvement method | |
| JPH1077625A (en) | Embedment structure of culvert | |
| JPH10131209A (en) | Construction method for preventing displacement of earth structure caused by liquefied ground | |
| JPH02132216A (en) | Foundations of landfill structures | |
| JPH03212515A (en) | Foundation structure of underground structure | |
| JP3364644B2 (en) | Liquefaction countermeasures for linear structures |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20100731 Year of fee payment: 12 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110731 Year of fee payment: 13 |
|
| EXPY | Cancellation because of completion of term | ||
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20110731 Year of fee payment: 13 |