JP2504682B2 - Underwater landfill method - Google Patents
Underwater landfill methodInfo
- Publication number
- JP2504682B2 JP2504682B2 JP538793A JP538793A JP2504682B2 JP 2504682 B2 JP2504682 B2 JP 2504682B2 JP 538793 A JP538793 A JP 538793A JP 538793 A JP538793 A JP 538793A JP 2504682 B2 JP2504682 B2 JP 2504682B2
- Authority
- JP
- Japan
- Prior art keywords
- soil
- lightweight
- underwater
- pipe
- cement
- 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
Description
【０００１】[0001]
【産業上の利用分野】本発明は、水中で地盤を構築する
水中埋立工法に係り、特に、気泡を含む軽量混合土で軽
量地盤を構築する水中埋立工法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater landfilling method for constructing a ground in water, and more particularly to an underwater landfilling method for constructing a lightweight ground with a lightweight mixed soil containing bubbles.
【０００２】[0002]
【従来の技術】従来の水中埋立は、一般的には、含水比
が１０００％に近い浚渫土スラリーを、例えばピストン
式圧送装置を用いて埋立て地まで管内圧送し、そして埋
立て地付近でこのスラリーから余水を分離した後、浚渫
土を水中に投下してこれを水中の基盤上に打設するとい
う方法によって実施されている。2. Description of the Related Art In conventional underwater landfill, generally, dredged soil slurry having a water content ratio of close to 1000% is pumped into a landfill site by using, for example, a piston type pumping device, and then near the landfill site. After separating the surplus water from this slurry, it is carried out by the method of dropping dredged soil into water and placing it on a basement in water.
【０００３】[0003]
【発明が解決しようとする課題】しかし、このような水
中埋立工法では、余水分離のために広い用地が必要であ
り、また、打設後、埋立地盤が脱水されて安定化するの
に長時間を要し、さらに水中の基盤が軟弱である場合に
は、かなりの地盤沈下を生ずるなどの問題がある。However, such an underwater landfilling method requires a large land for separation of spillage, and it also takes a long time for the landfill board to be dehydrated and stabilized after the construction. If it takes time and the basement in water is soft, there are problems such as considerable subsidence.
【０００４】[0004]
【課題を解決するための手段】本発明は、このような問
題を解決するために発明されたものであって、水中の基
盤が軟弱であっても地盤沈下を生じ難く、また浚渫土か
ら余水を分離させる必要もなく、さらに打設後に短時間
で埋立地盤を安定化させることができる水中埋立工法を
提供することを目的とし、高濃度浚渫土を、セメントお
よび気泡と管内混合し、その結果形成された軽量混合土
を圧縮空気により圧送管内で埋立現場まで圧送し、この
圧送管末端で圧縮空気と分離されて押し出された気泡を
含む軽量混合土を貯槽に貯蔵した後、これを水中の基盤
上に打設して軽量地盤を構築することを特徴とする、水
中埋立工法に係るものである。The present invention has been invented in order to solve such a problem, and it is difficult for land subsidence to occur even if the submerged foundation is soft, and it is not necessary to remove the dredged soil. With the aim of providing an underwater landfill method that can stabilize the landfill floor in a short time after placing without the need to separate water, high-concentration dredged soil is mixed with cement and air bubbles in the pipe, The resulting lightweight mixed soil is pumped by compressed air to the landfill site in the pumping pipe, and the lightweight mixed soil containing bubbles extruded after being separated from the compressed air at the end of the pumping pipe is stored in the storage tank and then stored in the water. The present invention relates to an underwater landfill construction method, which is characterized in that a lightweight ground is constructed by being placed on the base of the.
【０００５】本発明において用いられる高濃度浚渫土
は、含水比が９０〜２５０％のものを指している。含水
比９０％以下の高濃度浚渫土は実際には大量に得られな
い。この含水比が９０％未満になると、高濃度浚渫土は
流動性に乏しくなって管内で詰まり易くなって、これを
管内で圧縮空気により大量に輸送することが困難とな
り、他方これが２５０％よりも高くなると、埋立地盤で
所望の軽量性と強度を得るのに必要なセメント混合量が
多くなり過ぎるという不都合を生ずる。The high-concentration dredged soil used in the present invention has a water content of 90 to 250%. High-concentration dredged soil with a water content of 90% or less cannot be obtained in large quantities. When this water content ratio is less than 90%, the high-concentration dredged soil becomes poor in fluidity and easily clogs in the pipe, making it difficult to transport a large amount of this in the pipe by compressed air, while this is higher than 250%. If the height is too high, there is a disadvantage that the amount of cement to be mixed in the landfill is too large to obtain the desired lightness and strength.
【０００６】セメントとしては、コンクリート構造物ま
たはセメント製品の製造において通常使用されているい
ずれのセメントも使用することができ、例えば、普通ポ
ルトランドセメント、高炉セメント、フライアッシュセ
メントなどを使用することができる。セメントは、埋立
て地盤を短時間で安定化させて、それに所望の強度と剛
性を与え、そして高濃度浚渫土中に気泡が安定して保持
された軽量混合土を形成するために使用される。セメン
トの含有量は、所望する軽量混合土の単位体積重量、必
要な圧縮強度および気泡の混入量で変わるので、実際に
は予備試験で必要な配合を決定しなければならない。As the cement, any of the cements usually used in the production of concrete structures or cement products can be used, for example, ordinary Portland cement, blast furnace cement, fly ash cement and the like can be used. . Cement is used to stabilize landfills in a short period of time, give it the desired strength and stiffness, and form a lightweight mixed soil with stable retention of air bubbles in highly concentrated dredged soil. . Since the content of cement varies depending on the desired unit volume weight of the lightweight mixed soil, the required compressive strength, and the amount of air bubbles mixed in, it is necessary to actually determine the required composition by preliminary tests.
【０００７】気泡としては、通常気泡セメントを製造す
る際に使用される動物蛋白系またはアニオン界面活性剤
系の起泡材から得られるプレフォーム型気泡が好ましく
用いられる。気泡は、５００〜５０００ｃｐｓの粘度を
有するのが望ましい。気泡の粘度はＢ型粘度計を用いて
ローター回転数６０ｒｐｍで測定される値である。この
粘度が５００ｃｐｓ未満になると、気泡は高濃度浚渫土
中で破泡しやすくなり、他方それが５０００ｃｐｓより
も高くなると、起泡材の使用量が多くなり過ぎて経済上
好ましくない。As the cells, preform-type cells obtained from an animal protein-based or anionic surfactant-based foaming material usually used in the production of aerated cement are preferably used. The bubbles desirably have a viscosity of 500 to 5000 cps. The viscosity of bubbles is a value measured with a B-type viscometer at a rotor rotation speed of 60 rpm. When the viscosity is less than 500 cps, the bubbles are likely to be broken in the high-concentration dredged soil. On the other hand, when the viscosity is higher than 5000 cps, the amount of the foaming material used becomes too large, which is not economically preferable.
【０００８】本発明の軽量混合土の単位体積重量は１．
０５〜１．４０ｔｆ／ｍ3 が好ましい。軽量混合土の単
位体積重量が１．０５ｔｆ／ｍ3 未満になると、それの
単位体積重量が海水の比重に近くなるかあるいはそれを
下回って、海水中の打設が困難となり、他方これが１．
４０ｔｆ／ｍ3 よりも高くなると、通常の土砂の単位体
積重量に近づいて、格別軽量混合土としたメリットがな
くなって、埋立て地で地盤沈下が起こりやすくなる。The unit volume weight of the lightweight mixed soil of the present invention is 1.
05-1.40 tf / m 3 is preferable. When the unit volume weight of the lightweight mixed soil becomes less than 1.05 tf / m 3 , the unit volume weight of the lightweight soil becomes close to or lower than the specific gravity of sea water, which makes it difficult to place in the sea water, while 1.
When it is higher than 40 tf / m 3 , the unit volume weight of ordinary earth and sand is approached, and the advantage of being a special lightweight mixed soil is lost, and ground subsidence is likely to occur at the landfill site.
【０００９】高濃度浚渫土は、セメントおよび気泡と管
内混合されるが、これは混合コストを低減させるためで
ある。管内混合は、例えば、スタチックミキシング機構
を有する混合装置であり、土砂の通過による激しい摩耗
を考慮して、できるだけ構造が単純で、部品を交換し易
い混合装置を用いて行われる。The high-concentration dredged soil is mixed with cement and air bubbles in the pipe to reduce the mixing cost. The in-pipe mixing is, for example, a mixing device having a static mixing mechanism, and is performed by using a mixing device that has a simple structure and is easy to replace parts in consideration of severe wear due to passage of earth and sand.
【００１０】軽量混合土を埋立て地まで管内圧送する方
法としては、圧縮空気により圧送する方法が使用され
る。本発明による軽量混合土は土砂が分離され難いため
に、通常の浚渫土と比べて安定した状態で圧縮空気によ
り効率よく円滑に圧送することができる。圧縮空気によ
る管内圧送は、圧縮空気圧入装置を用いて行われる。As a method of pumping the lightweight mixed soil to the landfill, a method of pumping with compressed air is used. Since the lightweight mixed soil according to the present invention is difficult to separate the soil, it can be efficiently and smoothly pumped by compressed air in a stable state as compared with ordinary dredged soil. The compressed air in-pipe feeding is performed using a compressed air press-fitting device.
【００１１】圧送管の末端から軽量混合土が押し出され
る際には、圧送用の圧縮空気が分離されて、軽量混合土
はその後、一旦、貯槽に貯蔵される。軽量混合土の貯槽
は、槽内に排出機構を備えており、また打設管が接続さ
れている。When the lightweight mixed soil is extruded from the end of the pressure-feeding pipe, the compressed air for pressure-feeding is separated, and then the lightweight mixed soil is once stored in the storage tank. The lightweight mixed soil storage tank is equipped with a discharge mechanism inside the tank and is also connected with a casting pipe.
【００１２】貯槽中に貯蔵された軽量混合土は、水中で
どのように打設してもよいが、例えば、排出機構によっ
て打設管を通して水底に押し出されて基盤上に軽量地盤
が構築されることによって、水中埋立てを行うのが好都
合である。The lightweight mixed soil stored in the storage tank may be placed in any manner in water. For example, the discharge mechanism pushes the lightweight mixed soil through the placing pipe to the bottom of the water to construct the lightweight ground on the foundation. By doing so, it is convenient to perform landfilling in water.
【００１３】本発明の工法は、湖沼または河川のみなら
ず、海における水中埋立てにも利用でき、従って、本明
細書中で記載されている水中とは淡水中および海水中の
いずれをも意味している。The method of the present invention can be used not only for lakes and rivers but also for underwater landfilling in the sea. Therefore, the water described in the present specification means both freshwater and seawater. are doing.
【００１４】[0014]
【実施例】ついで図面を参照して、本発明の実施例を説
明する。図１は、本発明の水中埋立工法を遂行するため
に用いられる装置を組み合わせた一組の機構の一例を示
すブロック図である。図中、１は高濃度浚渫土供給装
置、２は圧送管、３はセメントスラリー貯槽、４はセメ
ントスラリー供給装置、５は起泡材貯槽、６はコンプレ
ッサー、７は発泡装置、８は管内混合装置、９は圧縮空
気圧入装置、１０は軽量混合土貯槽そして１１は打設管
を示す。また、１２は水、そして１３は水中の基盤を示
す。Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a block diagram showing an example of a set of mechanisms in which devices used for performing the underwater landfill method of the present invention are combined. In the figure, 1 is a high-concentration dredged soil supply device, 2 is a pressure feed pipe, 3 is a cement slurry storage tank, 4 is a cement slurry supply device, 5 is a foaming material storage tank, 6 is a compressor, 7 is a foaming device, and 8 is pipe mixing. The apparatus, 9 is a compressed air injection apparatus, 10 is a lightweight mixed soil storage tank, and 11 is a casting pipe. Further, 12 indicates water, and 13 indicates an underwater base.
【００１５】高濃度浚渫土供給装置１に、含水比１５０
％の高濃度浚渫土を用意する一方、セメントスラリー貯
槽３にセメントスラリーを導入し、そして起泡材貯槽５
に起泡材を導入した。高濃度浚渫土としては川崎市浮島
沖産の海成粘土を、セメントスラリーとしては高炉セメ
ントＢ種の水中懸濁液（水セメント比：５０％）を、そ
して起泡材としては動物蛋白系起泡材を用いた。The high-concentration dredged soil feeder 1 has a water content ratio of 150.
% High concentration dredged soil is prepared, while cement slurry is introduced into the cement slurry storage tank 3, and the foaming material storage tank 5
A foaming material was introduced into. Marine clay from off Ukishima, Kawasaki City was used as the high-concentration dredged soil, water suspension (water cement ratio: 50%) of blast furnace cement type B was used as the cement slurry, and animal protein-based foam was used as the foaming material. A foam material was used.
【００１６】高濃度浚渫土を、圧送管２を経て管内混合
装置８まで、ピストン式圧送装置（図示せず）を用いて
圧送する間に、セメントスラリー貯槽３に接続したセメ
ントスラリー供給装置４でセメントスラリーを圧送管に
供給し、そして起泡材貯槽５に接続された発泡装置７で
起泡材を発泡させた後、やはり圧送管２に供給した。気
泡の発泡倍率は２５倍であり、そして気泡の粘度は４２
００ｃｐｓであった。セメントスラリーおよび気泡の供
給量は、高濃度浚渫土に対して、それぞれ、１０容量％
および２０容量％であった。While the high-concentration dredged soil is being pressure-fed through the pressure-feeding pipe 2 to the in-pipe mixing device 8 using a piston-type pressure-feeding device (not shown), the cement-slurry supply device 4 connected to the cement-slurry storage tank 3 is used. The cement slurry was supplied to the pressure-feeding pipe, and after the foaming material was foamed by the foaming device 7 connected to the foaming-material storage tank 5, it was also supplied to the pressure-feeding pipe 2. The expansion ratio of the cells is 25 times, and the viscosity of the cells is 42.
It was 00 cps. The amount of cement slurry and bubbles supplied is 10% by volume for high-concentration dredged soil, respectively.
And 20% by volume.
【００１７】高濃度浚渫土と、セメントおよび気泡とを
管内混合装置８により混合して得られた軽量混合土を、
圧送管２を経て埋立て地付近に設置された軽量混合土貯
槽１０まで、圧縮空気圧力装置９を用いて圧縮空気によ
り圧送した。圧送管２の末端から軽量混合土が押し出さ
れる際に圧送用の圧縮空気が分離された。つぎに、この
軽量混合土を、排出機構を備えそして打設管１１が接続
された軽量混合土貯槽１０に貯蔵した後、打設管１１内
に押し込んでから、水１２中に押し出し、水中の基盤１
３上に打設した。水中の基盤上に打設された軽量混合土
の２８日後の一軸圧縮強度は２．２ｋｇｆ／ｃｍ2 であ
り、そして形成された軽量地盤の単位体積重量は１．１
５ｔｆ／ｍ3 であった。A lightweight mixed soil obtained by mixing high-concentration dredged soil with cement and air bubbles by an in-pipe mixing device 8
Compressed air was pressure-fed using the compressed air pressure device 9 to the lightweight mixed soil storage tank 10 installed near the landfill via the pressure-feeding pipe 2. Compressed air for pumping was separated when the lightweight mixed soil was extruded from the end of the pumping pipe 2. Next, after storing this lightweight mixed soil in the lightweight mixed soil storage tank 10 provided with the discharge mechanism and connected to the casting pipe 11, the lightweight mixed soil is pushed into the casting pipe 11 and then pushed into the water 12 to Foundation 1
Placed on top of 3. The uniaxial compressive strength of the lightweight mixed soil placed on the submerged foundation after 28 days is 2.2 kgf / cm 2 , and the unit volume weight of the formed lightweight ground is 1.1.
It was 5 tf / m 3 .
【００１８】[0018]
【発明の効果】本発明によれば、水中の基盤が軟弱であ
っても、これに軽量地盤を安定して構築できるので、埋
立て地の地盤沈下や周辺地盤への悪影響を軽減すること
ができ、また、埋立地盤の安定化期間を短縮できる。EFFECTS OF THE INVENTION According to the present invention, even if the underwater foundation is soft, the lightweight ground can be stably constructed, so that it is possible to reduce the ground subsidence of the landfill and the adverse effects on the surrounding ground. Also, the stabilization period of the landfill can be shortened.
【図１】図１は、本発明の水中埋立工法を行うために用
いられる機構の一例を示すブロック図である。FIG. 1 is a block diagram showing an example of a mechanism used for performing an underwater landfill method of the present invention.
１ 高濃度浚渫土供給装置 ２ 圧送管 ３ セメントスラリー貯槽 ４ セメントスラリー供給装置 ５ 起泡材貯槽 ６ コンプレッサー ７ 発泡装置 ８ 管内混合装置 ９ 圧縮空気圧入装置 １０ 軽量混合土貯槽 １１ 打設管 １２ 水 １３ 基盤 1 High-concentration dredged soil supply device 2 Pumping pipe 3 Cement slurry storage tank 4 Cement slurry supply device 5 Foaming material storage tank 6 Compressor 7 Foaming device 8 In-pipe mixing device 9 Compressed air injection device 10 Light weight mixed soil storage tank 11 Casting pipe 12 Water 13 Foundation
Claims (4)
管内混合し、その結果形成された軽量混合土を圧縮空気
により圧送管内で埋立現場まで圧送し、この圧送管末端
で圧縮空気と分離されて押し出された気泡を含む軽量混
合土を貯槽に貯蔵した後、これを水中の基盤上に打設し
て軽量地盤を構築することを特徴とする、水中埋立工
法。1. A high-concentration dredged soil is mixed with cement and air bubbles in a pipe, and the resulting lightweight mixed soil is pumped by compressed air to a landfill site in a pumping pipe, where it is separated from the compressed air at the end of the pumping pipe. An underwater landfill method characterized by constructing a lightweight ground by storing light mixed soil containing bubbles that have been extruded in a storage tank and then placing it on a submerged foundation.
である請求項１記載の水中埋立工法。2. The water content of highly concentrated dredged soil is 90 to 250%.
The underwater landfill method according to claim 1.
１．４０ｔｆ／ｍ3である請求項１または２記載の水中
埋立工法。3. The unit volume weight of the lightweight mixed soil is 1.05.
The underwater landfilling method according to claim 1 or 2, which has a rate of 1.40 tf / m 3 .
ある請求項１〜３のいずれか１項に記載の水中埋立工
法。4. The underwater landfill method according to claim 1, wherein the viscosity of the bubbles is 500 to 5000 cps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP538793A JP2504682B2 (en) | 1993-01-14 | 1993-01-14 | Underwater landfill method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP538793A JP2504682B2 (en) | 1993-01-14 | 1993-01-14 | Underwater landfill method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH06220823A JPH06220823A (en) | 1994-08-09 |
| JP2504682B2 true JP2504682B2 (en) | 1996-06-05 |
Family
ID=11609761
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP538793A Expired - Lifetime JP2504682B2 (en) | 1993-01-14 | 1993-01-14 | Underwater landfill method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2504682B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR101666074B1 (en) * | 2016-01-15 | 2016-10-14 | 한국경량혼합토 주식회사 | System that allow for high-speed site renovation using high water content dredged sediment and dredging work at the same time and method for hihg-speed site renovation |
| CN109577306B (en) * | 2018-11-28 | 2021-01-26 | 南京吉欧地下空间科技有限公司 | Foundation treatment technology and construction method of EPS foam dredger fill |
-
1993
- 1993-01-14 JP JP538793A patent/JP2504682B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH06220823A (en) | 1994-08-09 |
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