JPH044411B2 - - Google Patents
Info
- Publication number
- JPH044411B2 JPH044411B2 JP59201424A JP20142484A JPH044411B2 JP H044411 B2 JPH044411 B2 JP H044411B2 JP 59201424 A JP59201424 A JP 59201424A JP 20142484 A JP20142484 A JP 20142484A JP H044411 B2 JPH044411 B2 JP H044411B2
- Authority
- JP
- Japan
- Prior art keywords
- ground
- existing underground
- porous concrete
- water
- groundwater
- 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
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 14
- 239000000463 material Substances 0.000 claims description 12
- 239000003673 groundwater Substances 0.000 claims description 9
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 4
- 238000007667 floating Methods 0.000 description 4
- 239000004576 sand Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000004568 cement Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000002245 particle Substances 0.000 description 2
- 230000035699 permeability Effects 0.000 description 2
- 239000004927 clay Substances 0.000 description 1
- 238000005056 compaction Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005339 levitation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/32—Foundations for special purposes
- E02D27/34—Foundations for sinking or earthquake territories
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Investigation Of Foundation Soil And Reinforcement Of Foundation Soil By Compacting Or Drainage (AREA)
- Foundations (AREA)
Description
【発明の詳細な説明】
〈産業上の利用分野〉
本発明は既設地中構造物の浮上を防止する方法
に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a method for preventing levitation of existing underground structures.
〈従来の技術〉
地震の発生により、砂礫、砂、粘土等の粒子の
間〓を満たしている地下水に大きな水圧が発生
し、粒子間の地下水が地盤の砂や砂礫共々大きく
移動していわゆる液状化現象を発生することが知
られている。<Conventional technology> When an earthquake occurs, large water pressure is generated in the groundwater that fills the space between particles of gravel, sand, clay, etc., and the groundwater between the particles moves greatly together with the sand and gravel on the ground, forming a so-called liquid state. It is known that this phenomenon occurs.
地盤の液状化防止対策としては、一般に次の工
法が採用されている。 The following methods are generally used to prevent ground liquefaction.
(イ) 置換え工法
対象地盤を液状化しない材料に置換える工
法。(b) Replacement method A method of replacing the target ground with a material that will not liquefy.
(ロ) 締固め工法
対象地盤を転圧したり、振動を与えることで
圧密し地盤をを締固める工法。(b) Compaction method A method of compacting the ground by compacting it by rolling the target ground or applying vibration.
(ハ) 補強工法
薬液等なんらの材料を用いて対象地盤の強度
を増す工法。(c) Reinforcement method: A method of increasing the strength of the target ground using chemicals or other materials.
(ニ) ドレーン工法
ドレーン材を地中に縦方向に構築し、載荷重
によつて地下の間〓水を排水し、地盤を脱水強
化する方法。(d) Drain construction method A method in which drain materials are constructed vertically underground, and water is drained underground by the applied load to strengthen the ground.
〈本発明が解決しようとする問題点〉
上記したような各工法は、地上に既設構造物が
存在する直下地盤や、トンネル等のような既設地
中構造物の直下地盤に対しては採用が難しい。<Problems to be Solved by the Present Invention> The above-mentioned construction methods cannot be applied to the ground directly below existing underground structures such as tunnels, etc. difficult.
すなわち、既設の構造物の直下地盤を他の材料
に置換えたり、締固めることは不可能である。 In other words, it is impossible to replace the ground directly beneath an existing structure with another material or to compact it.
さらに構造物の構築前であればドレーン工法の
採用も可能であるが、構造物の構築後は採用が極
めて困難である。 Furthermore, although it is possible to use the drain method before the structure is constructed, it is extremely difficult to use it after the structure is constructed.
特にトンネルなどの既設地中構造物にあつて
は、地震による水位上昇に伴い浮力を受け、破損
する危険があり、その解決策の提案が急務とされ
ている。 In particular, existing underground structures such as tunnels are at risk of being damaged by the buoyancy caused by rising water levels due to earthquakes, and there is an urgent need to propose solutions to this problem.
〈本発明の目的〉
本発明は単に地盤の改良、強化を目的とする従
来工法に鑑みてなされたもので、その目的とする
ところは、地震等における既設の地中構造物の浮
上を防止できる、既設地中構造物の浮上を防止す
る方法を提供することを目的とする。<Object of the present invention> The present invention was made in view of conventional construction methods that simply aim to improve and strengthen the ground, and its purpose is to prevent existing underground structures from floating up in the event of an earthquake, etc. The purpose of this invention is to provide a method for preventing existing underground structures from surfacing.
〈問題点を解決するための手段〉
本発明では、多孔質コンクリートパイプによる
高強度のドレーン材を、地上側から既設地中構造
物の直下に向けて斜めに構築する。<Means for Solving the Problems> In the present invention, a high-strength drain material made of a porous concrete pipe is constructed diagonally from the ground side directly below the existing underground structure.
これにより、地震時のみ上昇した間〓水をドレ
ーン材で排水して既設地中構造物の浮上を防止
し、併せて地盤の液状化も抑制することができ
る。 This makes it possible to drain water that has risen during an earthquake using the drain material, preventing existing underground structures from floating up, and also suppressing liquefaction of the ground.
〈実施例〉
次に本発明の一実施例を図面を参照しながら説
明する。<Example> Next, an example of the present invention will be described with reference to the drawings.
(イ) ドレーン材（第２図）
ドレーン材は高強度の多孔質コンクリートパ
イプ１で構成する。(a) Drain material (Figure 2) The drain material consists of a high-strength porous concrete pipe 1.
多孔質コンクリートパイプ１は、接続して用
いる複数の多孔質コンクリート筒と、この筒体
の外周面を被覆するフイルター２で構成する。 The porous concrete pipe 1 is composed of a plurality of porous concrete cylinders that are connected and used, and a filter 2 that covers the outer peripheral surface of the cylinders.
(ロ) 多孔質コンクリート筒
多孔質コンクリート筒は、目詰まりをしない
範囲の透水性を有する。(b) Porous concrete cylinder A porous concrete cylinder has water permeability within a range that does not cause clogging.
多孔質コンクリート筒は容易かつ短時間に間
〓水圧を排出するために、透水係数が102cm／
sec程度以上であることが望ましい。 Porous concrete cylinders have a hydraulic conductivity of 10 2 cm / 2 cm in order to easily and quickly discharge water pressure.
It is desirable that it be about sec or more.
前記条件を満足するコンクリートの配合例を
以下に例示する。 Examples of concrete formulations that satisfy the above conditions are illustrated below.
砂：８〜10部（重量）
セメント：８〜10部（重量）
水セメント比（Ｗ／Ｃ）：40〜45％
(ハ) フイルタ
フイルター２は多孔質コンクリート筒の透水
性を持続させる目的で設置する。Sand: 8-10 parts (weight) Cement: 8-10 parts (weight) Water-cement ratio (W/C): 40-45% (c) Filter Filter 2 is used to maintain the water permeability of the porous concrete cylinder. Install.
フイルタ２には水の透過を許容し、土砂の透
過を阻止する防錆処理した金網や耐塩性に優れ
たプラスチツク網等を使用できる。 The filter 2 can be made of a rust-proofed metal mesh that allows water to pass through but prevents earth and sand from passing through, or a plastic mesh that has excellent salt resistance.
〈作用〉 次に本発明の作用について説明する。<Effect> Next, the operation of the present invention will be explained.
(イ) ドレーン材の建込み（第３図）
地上側から既設地中構造物３の直下に向け斜
め方向にドレーン材である多孔質コンクリート
パイプ１を打ち込む等して構築する。(B) Installation of drain material (Figure 3) Construct by pouring the porous concrete pipe 1, which is the drain material, diagonally from the ground side directly below the existing underground structure 3.
非地震時においては地中の地下水に圧力が作
用しないから、地下水は多孔質コンクリートパ
イプ１内に浸透するだけで、排水は行われな
い。 During non-earthquake times, no pressure acts on groundwater underground, so groundwater only percolates into the porous concrete pipe 1 and is not drained.
したがつて、多孔質コンクリートパイプ１の
内外における水位は変化せず同一状態に維持さ
れる。 Therefore, the water levels inside and outside of the porous concrete pipe 1 do not change and are maintained in the same state.
この点が本発明の特徴であつて、従来のドレ
ーン工法のようにパイプ内の排水を行つて周囲
の水位を降下させる工法と根本的に異なるとこ
ろである。 This point is a feature of the present invention, and is fundamentally different from the conventional drain construction method, which drains water inside a pipe to lower the surrounding water level.
(ハ) 地震発生時（第１図）
地震が発生すると地中の間〓水圧が増してい
く。(c) When an earthquake occurs (Figure 1) When an earthquake occurs, water pressure increases underground.
既設地中構造物３の直下の地盤も同様に間〓
水圧が増大する。 Similarly, the ground directly under the existing underground structure 3 is
Water pressure increases.
多孔質コンクリートパイプ１の下部がこの直
下地盤に到達しているため、上昇しようとする
地下水が多孔質コンクリートパイプ１内に集水
する。 Since the lower part of the porous concrete pipe 1 reaches the ground directly below, groundwater that is about to rise collects inside the porous concrete pipe 1.
多孔質コンクリートパイプ１は集水した水を
急激に地上へ排水する。 The porous concrete pipe 1 rapidly drains the collected water to the ground.
その果、既設地中構造物３の直下の地盤の水
位上昇が解消され、既設地中構造物３の浮上を
効果的に阻止できる。 As a result, the rise in the water level in the ground directly below the existing underground structure 3 is eliminated, and the floating of the existing underground structure 3 can be effectively prevented.
併せて、地盤の液状化も阻止できる。 At the same time, liquefaction of the ground can also be prevented.
〈本発明の効果〉
本発明は以上説明したように、地上から既設地
中構造物の直下まで、斜めに高強度のドレーン材
を構築したことにより、地震時のみ排水して地下
水の上昇を抑え、既設地中構造物の浮上を効果的
に防止することができる。<Effects of the present invention> As explained above, the present invention constructs a high-strength drain material diagonally from the ground to just below the existing underground structure, thereby draining water only in the event of an earthquake and suppressing the rise of groundwater. , it is possible to effectively prevent existing underground structures from floating up.
また既設地中構造物の直下地盤の液状化現象も
効果的に阻止することができる。 It is also possible to effectively prevent liquefaction of the ground directly beneath existing underground structures.
第１図：地震時における排水状態を説明するた
めの説明図、第２図：多孔質コンクリートパイプ
の説明図、第３図：非地震時における地下水の状
態を説明するための説明図。
Figure 1: An explanatory diagram for explaining the state of drainage during an earthquake. Figure 2: An explanatory diagram of a porous concrete pipe. Figure 3: An explanatory diagram for explaining the state of groundwater during a non-earthquake.
Claims (1)
防止する方法において、 地上から既設地中構造物の直下まで、多孔質コ
ンクリートパイプで構成した高強度のドレーン材
を斜め方向に構築し、 常時は排水せず、地震時のみに上昇した間〓水
をドレーン材で排水して地下水の水位の上昇を抑
制することを特徴とする、 既設地中構造物の浮上を防止する方法。[Claims] 1. A method for preventing the surfacing of an existing underground structure due to rising groundwater, comprising: diagonally extending a high-strength drain material made of a porous concrete pipe from the ground to just below the existing underground structure; This method prevents existing underground structures from surfacing by constructing them and suppressing the rise in groundwater levels by draining water that rises only during earthquakes and not draining it all the time. Method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20142484A JPS6183711A (en) | 1984-09-28 | 1984-09-28 | Method of preventing liquefaction of ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20142484A JPS6183711A (en) | 1984-09-28 | 1984-09-28 | Method of preventing liquefaction of ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6183711A JPS6183711A (en) | 1986-04-28 |
| JPH044411B2 true JPH044411B2 (en) | 1992-01-28 |
Family
ID=16440847
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20142484A Granted JPS6183711A (en) | 1984-09-28 | 1984-09-28 | Method of preventing liquefaction of ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6183711A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6389716A (en) * | 1986-10-03 | 1988-04-20 | Fujita Corp | Preventing work against liquefaction of ground |
| JP2761529B2 (en) * | 1989-10-20 | 1998-06-04 | 清水建設株式会社 | Liquefaction prevention method for sand ground |
| FR2660353A1 (en) * | 1990-03-30 | 1991-10-04 | Technologies Speciales Ingenie | Earthquake resistance methods and shields |
| JP4873115B2 (en) * | 2001-08-21 | 2012-02-08 | 日本電気硝子株式会社 | Block glass panel |
| JP6283485B2 (en) * | 2013-09-09 | 2018-02-21 | 株式会社アイ・シー・ジー | Ground improvement / pile structure for liquefaction countermeasures and ground improvement / liquefaction countermeasure construction method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142815A (en) * | 1979-04-24 | 1980-11-07 | Shimizu Constr Co Ltd | Liquefaction preventing method for sandy ground |
| JPS58127822A (en) * | 1982-01-25 | 1983-07-30 | Takechi Koumushiyo:Kk | Liquefaction preventive structure of foundation ground |
-
1984
- 1984-09-28 JP JP20142484A patent/JPS6183711A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55142815A (en) * | 1979-04-24 | 1980-11-07 | Shimizu Constr Co Ltd | Liquefaction preventing method for sandy ground |
| JPS58127822A (en) * | 1982-01-25 | 1983-07-30 | Takechi Koumushiyo:Kk | Liquefaction preventive structure of foundation ground |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6183711A (en) | 1986-04-28 |
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