JP3055033B2 - Creating artificial islands - Google Patents
Creating artificial islandsInfo
- Publication number
- JP3055033B2 JP3055033B2 JP2274552A JP27455290A JP3055033B2 JP 3055033 B2 JP3055033 B2 JP 3055033B2 JP 2274552 A JP2274552 A JP 2274552A JP 27455290 A JP27455290 A JP 27455290A JP 3055033 B2 JP3055033 B2 JP 3055033B2
- Authority
- JP
- Japan
- Prior art keywords
- landfill
- revetment
- artificial island
- ground improvement
- ground
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 （発明が属する技術分野） 本発明は人工島の造成方法に関する。Description: TECHNICAL FIELD The present invention relates to a method for creating an artificial island.
（発明の課題とその特徴点） 従来、人工島を造成する場合は、造成区域全体の海底
地盤を適宜手段で地盤改良し、その周縁に沿って護岸を
築造した後、その内方区域を浚渫土、砂等で埋立ててい
るのが通例であるが、この従来例は、地盤改良区域が大
きい上、比較的堅固な護岸を必要とするため、工事コス
トや施工期間の面で問題があった。(Problems of the invention and its features) Conventionally, when constructing an artificial island, the seabed ground of the entire development area is improved by appropriate means, a seawall is built along the periphery, and then the inner area is dredged. It is customary to bury it with soil, sand, etc., but this conventional example has problems in terms of construction costs and construction period because the ground improvement area is large and relatively solid revetments are required. Was.
本発明は、前記従来例と比較して、工事コストの低減
や工事期間の短縮が期待できる人工島の造成方法を提供
することを目的としているものであって、その構成上の
特徴は特許請求の範囲に記載したとおりである。An object of the present invention is to provide a method for constructing an artificial island that can be expected to reduce the construction cost and the construction period, as compared with the conventional example. As described in the range.
本発明で用いる埋立材は、内部に気泡を含んでいるた
め、その単位体積重量が1.05〜1.25t/m3程度で、従来の
埋立土に比べて軽量であり、また、セメント固化材を含
んでいるため、その固化後に２〜5kg f/cm2程度の圧縮
強度を持つようになる。Landfill material used in the present invention, because it contains air bubbles therein, its specific weight is of about 1.05~1.25t / m 3, a lightweight compared to conventional landfill soil, also comprising a cement solidifying material Therefore, after solidification, it has a compressive strength of about 2 to 5 kg f / cm 2 .
（発明の具体的説明） 本発明の一実施態様の説明図である図面において、１
は地盤改良部、２は護岸、３は埋立部を示している。(Detailed Description of the Invention) FIG.
Indicates a ground improvement section, 2 indicates a revetment, and 3 indicates a reclamation section.
地盤改良部１は、造成する人工島の輪郭に沿って適宜
巾Ｂの海底地盤を地盤改良して形成するが、地盤改良の
手段は任意である。The ground improvement unit 1 forms the seabed ground having a width B appropriately along the contour of the artificial island to be formed by ground improvement, but the ground improvement means is arbitrary.
地盤改良部１の上に築造する護岸２の形式は任意であ
り、図示の重力式に限定されない。The type of the revetment 2 to be built on the ground improvement part 1 is arbitrary, and is not limited to the gravity type shown in the figure.
埋立部３には、粘性土に水、セメント系固化材、起泡
剤、及び分離低減剤を攪拌混合して成る埋立材を中詰め
するが、埋立材の各材料の混合割合を例示すると、次の
とおりである。The landfill part 3 is filled with a landfill material obtained by stirring and mixing water, a cement-based solidifying material, a foaming agent, and a separation-reducing agent into a viscous soil. When the mixing ratio of each material of the landfill material is exemplified, It is as follows.
粘性土 500kg/m3 水 500kg/m3 固化材 150kg/m3 起泡剤 4kg/m3 分離低減剤 1kg/m3 埋立材の中詰めは水中施工で行うが、その作業は、海
上の作業船の混合プラントからモルタルポンプで送っ
て、埋立区域４内の水面下に挿入したシュートの下端か
ら排出させて行うものである。Cohesive soil 500 kg / m 3 Water 500 kg / m 3 Solidified material 150 kg / m 3 Foaming agent 4 kg / m 3 Separation reducing agent 1 kg / m 3 Filling of landfill material is performed underwater, but the work is offshore It is sent from a mixing plant of a ship by a mortar pump and discharged from the lower end of a chute inserted below the water surface in the landfill area 4.
（発明の効果） 本発明は次のような作用効果を奏する。(Effects of the Invention) The present invention has the following effects.
海底の軟弱地盤を人工島の輪郭に沿って適宜巾で地盤
改良し、この地盤改良部の上に護岸を築造ことにより、
護岸本体についての安定性・安全性を確保でき、護岸で
囲まれた埋立部相当下の海底の軟弱地盤の地盤改良を行
わなくて良く、 その後、護岸で囲まれた埋立部に粘性土、水、セメン
ト系固化材、起泡材及び分離低減剤を攪拌混合してなる
埋立材を水中施工で中詰めすることにより、該埋立材は
海水と同等か僅かに重い程度の軽量化（単位体積重量:
1.05〜1.25t/m3）になり、且つ、適度な固化機能（圧縮
強度:2〜5kg f/cm2））を有するものとなり、埋立材に
よる荷重と地盤支持力とのバランスをとることが比較的
容易になり、「護岸で囲まれた埋立部」は地盤改良を行
わなくて良い。By improving the soft ground on the seafloor with appropriate width along the contour of the artificial island and constructing a revetment on this ground improvement part,
The stability and safety of the revetment main body can be ensured, and it is not necessary to improve the soft ground on the seabed under the reclaimed area surrounded by the revetment. By filling the landfill material, which is made by stirring and mixing a cement-based solidifying material, a foaming material, and a separation-reducing agent, underwater construction, the landfill material can be reduced in weight to about the same or slightly heavier than seawater (unit volume weight). :
1.05 to 1.25 t / m 3 ) and has an appropriate solidification function (compressive strength: 2 to 5 kg f / cm 2 )), and can balance the load from the landfill material and the ground support force. It is relatively easy, and "landfills surrounded by revetments" do not require ground improvement.
また、人工島として、前記埋立部上に構造物を建造し
たときに発生する地盤沈下を小さく抑えることができ
る。In addition, land subsidence that occurs when a structure is built on the landfill as an artificial island can be suppressed to a small level.
さらに、本発明の埋立材は上記のとおり固化するの
で、地震等が起こった場合にも砂のように液状化する恐
れがない。また、埋立材が適度の固化強度であり、その
後、掘削する場合（構造物を構築する際、掘削が必要と
される場合がある。）も、掘削作業が容易である。Further, since the landfill material of the present invention is solidified as described above, there is no possibility of liquefaction like sand even when an earthquake or the like occurs. Also, when the landfill material has an appropriate solidification strength and is subsequently excavated (excavation may be required when constructing a structure), the excavation work is easy.
護岸で囲まれた埋立部に前記埋立材を「水中施工で中
詰めする」ことにより、埋立部内に海水が存在し、その
ような状態のまま前記埋立材で中詰めし、護岸の内外で
のバランスを保ちながら護岸で囲まれた内部を埋め立て
る。By filling the landfill material in the landfill surrounded by revetment by `` filling it in underwater construction '', seawater exists in the landfill, and it is filled with the landfill material in such a state, and inside and outside the revetment Reclaim the interior surrounded by seawall while maintaining balance.
もし、護岸で囲まれた内部を空にして、そこに埋立材
を投入することを考えると、護岸本体には外部の水深相
当の水圧を受けることになり、護岸本体はきわめて強度
の高い構造としなければならず、護岸工事費の高騰化及
び築造期間の長期化をまねくことになる。If the interior surrounded by revetment is emptied and landfill material is put into it, the revetment body will be subjected to water pressure equivalent to the external water depth, and the revetment body will have an extremely strong structure. This will increase the cost of revetment work and prolong the construction period.
したがって、護岸の内外でのバランスを保ちながら内
部の埋立を行うことにより、護岸構造を簡易にすること
ができ、工事コストの低減および工事期間の短縮化を図
れ、本願発明の前記埋立材は、海水より僅かに重く且つ
固化材の他に分離低減剤をも含有しているから、前記埋
立材が分離することなく水中にてスムーズに着底し、順
次中詰めされる。Therefore, by reclaiming the inside while keeping the balance inside and outside the revetment, it is possible to simplify the revetment structure, reduce the construction cost and shorten the construction period, the landfill material of the present invention, Since it is slightly heavier than seawater and also contains a separation reducing agent in addition to the solidified material, the landfill material can be smoothly settled in water without being separated, and sequentially packed.
図面は本発明説明用の縦断面図である。 1:地盤改良部、2:護岸、3:埋立部、4:構造物。 The drawings are longitudinal sectional views for explaining the present invention. 1: ground improvement section, 2: seawall, 3: landfill section, 4: structure.
フロントページの続き (72)発明者 松下 正憲 東京都台東区台東１―２―１ 不動建設 株式会社内 (72)発明者 深田 久 東京都台東区台東１―２―１ 不動建設 株式会社内 (72)発明者 入島 文雄 東京都台東区台東１―２―１ フドウ技 研株式会社内 (72)発明者 石崎 仁 千葉県船橋市習志野台５―25―４ (72)発明者 吉原 正博 千葉県船橋市新高根３―27―１ (56)参考文献 特開 昭63−19315（ＪＰ，Ａ) 特開 平２−31812（ＪＰ，Ａ) 特開 昭56−48415（ＪＰ，Ａ) 特公 昭55−48132（ＪＰ，Ｂ２) (58)調査した分野(Int.Cl.7，ＤＢ名) E02B 17/00 - 17/08 E02B 3/18 Continued on the front page (72) Inventor Masanori Matsushita 1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd. (72) Inventor Hisashi Fukata 1-2-1 Taito, Taito-ku, Tokyo Fudo Construction Co., Ltd. (72 Inventor Fumio Irishima 1-2-1 Taito, Taito-ku, Tokyo (72) Inventor Jin Ishizaki 5-25-4 Narashinodai, Funabashi City, Chiba Prefecture (72) Inventor Masahiro Yoshihara Funabashi City, Chiba Prefecture 2-27-1 Shintakane (56) References JP-A-63-19315 (JP, A) JP-A-2-31812 (JP, A) JP-A-56-48415 (JP, A) 48132 (JP, B2) (58) Fields investigated (Int. Cl. 7 , DB name) E02B 17/00-17/08 E02B 3/18
Claims (1)
宜巾で地盤改良し、この地盤改良部の上に護岸を築造し
た後、該護岸で囲まれた埋立部に、粘性土に水、セメン
ト系固化材、起泡剤、及び分離低減剤を攪拌混合して成
る埋立材を水中施工で中詰めすることを特徴とする人工
島の造成方法。(1) A soft ground on the seabed is improved with an appropriate width along the contour of an artificial island, and a revetment is constructed on the ground improvement portion. What is claimed is: 1. A method for creating an artificial island, comprising: filling a landfill material obtained by stirring and mixing water, a cement-based solidifying material, a foaming agent, and a separation reducing agent by underwater construction.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2274552A JP3055033B2 (en) | 1990-10-12 | 1990-10-12 | Creating artificial islands |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2274552A JP3055033B2 (en) | 1990-10-12 | 1990-10-12 | Creating artificial islands |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04149308A JPH04149308A (en) | 1992-05-22 |
| JP3055033B2 true JP3055033B2 (en) | 2000-06-19 |
Family
ID=17543316
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2274552A Expired - Fee Related JP3055033B2 (en) | 1990-10-12 | 1990-10-12 | Creating artificial islands |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3055033B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5142795B2 (en) * | 2008-04-08 | 2013-02-13 | 株式会社冨士機 | Deep ground improvement method |
-
1990
- 1990-10-12 JP JP2274552A patent/JP3055033B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04149308A (en) | 1992-05-22 |
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