JPH01102129A - Preventor for permanent displacement of buried object by liquefaction of ground - Google Patents
Preventor for permanent displacement of buried object by liquefaction of groundInfo
- Publication number
- JPH01102129A JPH01102129A JP62256317A JP25631787A JPH01102129A JP H01102129 A JPH01102129 A JP H01102129A JP 62256317 A JP62256317 A JP 62256317A JP 25631787 A JP25631787 A JP 25631787A JP H01102129 A JPH01102129 A JP H01102129A
- Authority
- JP
- Japan
- Prior art keywords
- ground
- buried
- liquefied
- liquefaction
- buried object
- 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.)
- Pending
Links
- 238000006073 displacement reaction Methods 0.000 title claims abstract description 8
- 238000005243 fluidization Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 4
- 238000010276 construction Methods 0.000 description 4
- 239000012530 fluid Substances 0.000 description 3
- 239000003673 groundwater Substances 0.000 description 3
- 239000002245 particle Substances 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000006378 damage Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
Landscapes
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は傾斜基盤上の流動化地盤に埋設される沈埋管、
ガス供給用埋設管等の埋設物の、地盤の流動化時におけ
る永久変位防止装置に係るものである。Detailed Description of the Invention (Industrial Application Field) The present invention relates to an immersed pipe buried in fluidized ground on a sloped foundation;
This relates to a device to prevent permanent displacement of buried objects such as buried gas supply pipes when the ground becomes fluidized.
（従来の技術）
地下水を有する砂質地盤は、大地震時に土粒子の組合せ
が密になることから地下水の存在する空間が小さくな）
、間隙水圧が上昇し、同間隙水圧と上載荷重による圧力
とが等しくなるときに完全な液状化を生起する。(Conventional technology) In sandy ground that has groundwater, the space in which groundwater exists is small because the combination of soil particles becomes dense during a major earthquake.
, the pore water pressure increases and complete liquefaction occurs when the pore water pressure and the pressure due to the overburden load become equal.
地盤が液状化すると、地盤上の構造物は沈下や破壊を生
起し、地盤中の埋設物はその見掛けの密度が液状化地盤
の密度より小さい場合には浮上する。When the ground liquefies, structures on the ground sink or break, and objects buried in the ground float up if their apparent density is lower than the density of the liquefied ground.
而して液状化地盤の下に位置する基盤が傾斜している場
合、液状化地盤は流動してその永久変位量は数メートル
にも達する。If the foundation located under the liquefied ground is inclined, the liquefied ground will flow and its permanent displacement will reach several meters.
従って傾斜基盤上の流動化地盤に埋設され、アンカーま
たは杭基礎を介して前記基盤に支持された埋設物は、流
動する液状化地盤に押し流されるのを防止、または軽減
する必要がある。Therefore, it is necessary to prevent or reduce the possibility that buried objects buried in fluidized ground on a sloped foundation and supported by the foundation via anchors or pile foundations will be swept away by the flowing liquefied ground.
従来の工法は地盤の流動化全防止する工法であって、地
下水を抜く工法、地盤を締固める工法、液状化しない材
料と置換する工法、シートパイル等で締切シ、締切られ
た部分の地盤が液状化しても、液状化した地盤の粒子が
シートパイルの外部に流出するのを抑止し、液状化地盤
上の盛土の沈下、破壊を軽減する工法が提案されている
。Conventional construction methods are methods that completely prevent fluidization of the ground, including methods for draining groundwater, compacting the ground, replacing it with materials that do not liquefy, and using sheet piles, etc., to prevent the ground from becoming fluid. Even in the event of liquefaction, construction methods have been proposed that prevent particles from the liquefied ground from flowing out of the sheet pile and reduce the settling and destruction of embankments on liquefied ground.
（発明が解決しようとする問題点）
前記従来の工法は特定の個所に対しては有効であるが、
広汎、または長大な地盤に対しては経済性の面で難点が
あ夛、シートパイルで締切る工法は経済性の点で問題が
あるのみならず、締切られた地盤内が液状化するため、
埋設物の液状化対策としてこの工法を採用することは不
適当である。(Problems to be solved by the invention) Although the conventional construction methods described above are effective for specific locations,
There are many disadvantages in terms of economic efficiency when dealing with extensive or long ground, and the method of closing with sheet piles not only has problems in terms of economy, but also because the inside of the closed ground becomes liquefied.
It is inappropriate to adopt this construction method as a countermeasure against liquefaction of buried objects.
（問題点を解決するための手段）
本発明はこのような問題点を解決するために提案された
もので、傾斜基盤上の液状化地盤に埋設され、アンカー
または杭基礎を介して前記基盤上に支持された埋設物を
流線形に形成してなり、地盤が液状化して流動した際の
埋設物に対する流動化地盤の抵抗を軽減せしめるように
構成してなることを特徴とする地盤の液状化による埋設
物の永久変位防止装置に係るものである。(Means for Solving the Problems) The present invention was proposed in order to solve the above problems. Liquefaction of the ground, characterized in that the buried objects supported by the ground are formed into a streamlined shape, and are configured to reduce the resistance of the fluidized ground against the buried objects when the ground liquefies and flows. This relates to a permanent displacement prevention device for buried objects.
（作用）
本発明においては前記したように、傾斜基盤上の液状化
地盤に埋設され、アンカーまたは杭基礎を介して前記基
盤上に支持された埋設物を流線形に形成したので、前記
地盤が液状化してしかも流動する場合、埋設物に対する
流動化地盤の抵抗が軽減され、液状化地盤のみが流動化
するとともに、埋設物の浮上、沈下がアンカーまたは杭
基礎によって防止され、埋設物は原位置に保持される。(Function) As described above, in the present invention, the buried object is formed into a streamlined shape, which is buried in the liquefied ground on the sloped foundation and supported on the foundation via the anchor or pile foundation. When liquefying and flowing, the resistance of the fluidized ground to the buried object is reduced, and only the liquefied ground becomes fluid, and anchors or pile foundations prevent the buried object from rising or sinking, and the buried object remains in its original location. is maintained.
（実施例） 以下本発明を図示の実施例について説明する。(Example) The present invention will be described below with reference to the illustrated embodiments.
調査、設計段階で把握される傾斜基盤（１）上の液状化
地盤（２）の流動を想定し、同地盤（２）内の埋設物（
３）の形状を流線形とするとともに、同埋設物（３）を
アンカー、または杭基礎（４）を介して前記基盤（１）
に定着、支持する。Assuming the flow of the liquefied ground (2) on the sloped foundation (1), which is understood at the survey and design stage, the buried objects (
3) is streamlined, and the buried object (3) is attached to the foundation (1) via an anchor or pile foundation (4).
established and supported.
図示の実施例は前記したように構成されて込るので、切
震時において前記地盤（２）が液状化し、しかも矢印に
示すように流動する場合、流線形状の埋設物（３）に対
する流動化地盤の抵抗が軽減され、液状化地盤（２）の
み流動するとともに、埋設物（３）の浮上、沈下がアン
カーまたは杭基礎（４）によって防止され、埋設物（３
）は原位置に保持される。Since the illustrated embodiment is configured as described above, when the ground (2) liquefies during an earthquake and flows as shown by the arrow, the flow to the streamlined buried object (3) The resistance of the liquefied ground is reduced, and only the liquefied ground (2) flows, and the floating and sinking of the buried object (3) is prevented by the anchor or pile foundation (4), and the buried object (3)
) is held in its original position.
（発明の効果）
このように本発明によれば傾斜基盤上の液状化地盤に埋
設され、アンカーまたは杭基礎を介して前記基盤上に支
持された埋設物の形状を、流体内で抵抗が小さくなる流
線形として、埋設物が流動する液状化地盤に押し流され
るのを軽減、防止するものである。(Effects of the Invention) As described above, according to the present invention, the shape of the buried object buried in the liquefied ground on the sloped foundation and supported on the foundation via the anchor or pile foundation can be changed to a shape with low resistance in the fluid. This streamlined shape reduces and prevents buried objects from being swept away by the flowing liquefied ground.
第１図は本発明に係る地盤の液状化による埋設物の永久
変位防止装置の一実施例を示す縦断面図である。
（１）・・・傾斜基盤、 （２）・・・液状化地盤
、（３）・・・埋設物、 （４）・・・アンカーまた
は杭基礎。FIG. 1 is a longitudinal sectional view showing an embodiment of the device for preventing permanent displacement of buried objects due to liquefaction of the ground according to the present invention. (1)...Sloped foundation, (2)...Liquefied ground, (3)...Buried objects, (4)...Anchor or pile foundation.
Claims (1)
基礎を介して前記基盤上に支持された埋設物を流線形に
形成してなり、地盤が液状化して流動した際の埋設物に
対する流動化地盤の抵抗を軽減せしめるように構成して
なることを特徴とする地盤の液状化による埋設物の永久
変位防止装置。The buried object is buried in liquefied ground on a sloped foundation and supported on the foundation via anchors or pile foundations, and is formed into a streamlined shape to prevent fluidization of the buried object when the ground liquefies and flows. A device for preventing permanent displacement of buried objects due to liquefaction of the ground, characterized by being configured to reduce ground resistance.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256317A JPH01102129A (en) | 1987-10-13 | 1987-10-13 | Preventor for permanent displacement of buried object by liquefaction of ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62256317A JPH01102129A (en) | 1987-10-13 | 1987-10-13 | Preventor for permanent displacement of buried object by liquefaction of ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01102129A true JPH01102129A (en) | 1989-04-19 |
Family
ID=17290985
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62256317A Pending JPH01102129A (en) | 1987-10-13 | 1987-10-13 | Preventor for permanent displacement of buried object by liquefaction of ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01102129A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009013061A (en) * | 2008-08-29 | 2009-01-22 | Asahi Glass Co Ltd | Method and apparatus for aligning glass plate and method for bending glass plate |
| KR101368765B1 (en) * | 2012-06-15 | 2014-03-03 | 삼성중공업 주식회사 | Pipe for undersea |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59219589A (en) * | 1983-05-27 | 1984-12-10 | 日本鋼管株式会社 | Method of ground liquefaction countermeasure construction ofburied duct |
-
1987
- 1987-10-13 JP JP62256317A patent/JPH01102129A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59219589A (en) * | 1983-05-27 | 1984-12-10 | 日本鋼管株式会社 | Method of ground liquefaction countermeasure construction ofburied duct |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009013061A (en) * | 2008-08-29 | 2009-01-22 | Asahi Glass Co Ltd | Method and apparatus for aligning glass plate and method for bending glass plate |
| KR101368765B1 (en) * | 2012-06-15 | 2014-03-03 | 삼성중공업 주식회사 | Pipe for undersea |
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