JP2003261941A - Underwater back filling method and underwater back filling material - Google Patents

Underwater back filling method and underwater back filling material

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Publication number
JP2003261941A
JP2003261941A JP2002062929A JP2002062929A JP2003261941A JP 2003261941 A JP2003261941 A JP 2003261941A JP 2002062929 A JP2002062929 A JP 2002062929A JP 2002062929 A JP2002062929 A JP 2002062929A JP 2003261941 A JP2003261941 A JP 2003261941A
Authority
JP
Japan
Prior art keywords
underwater
liquid
soil
filling
construction
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
Application number
JP2002062929A
Other languages
Japanese (ja)
Inventor
Yasushi Omodaka
安志 面高
Akita Kawakami
明大 川上
Masahiro Yoshihara
正博 吉原
Hideo Takahashi
秀夫 高橋
Original Assignee
Sumitomo Osaka Cement Co Ltd
住友大阪セメント株式会社
Esutekku:Kk
株式会社エステック
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sumitomo Osaka Cement Co Ltd, 住友大阪セメント株式会社, Esutekku:Kk, 株式会社エステック filed Critical Sumitomo Osaka Cement Co Ltd
Priority to JP2002062929A priority Critical patent/JP2003261941A/en
Publication of JP2003261941A publication Critical patent/JP2003261941A/en
Pending legal-status Critical Current

Links

Abstract

<P>PROBLEM TO BE SOLVED: To provide an underwater back filling material enabling addition of a large volume of soil to be treated and having a high underwater separated resistance and such an underwater back filling method capable of solving the problem that a large volume of soil produced at a site is difficult to effectively use as the underwater back filling material since the water content per unit volume is high in the conventional underwater back filling work even though an underwater back filling work to the back of a revetment or the like is required for the ground subsidence prevention or the hollow filling when a wharf or the revetment is formed. <P>SOLUTION: A hardener liquid containing cement and soil to be treated is mixed with a plasticizer containing attapulgite and a phosphate dispersant to use as a plastic back filling material, and the back filling material is poured into an underwater construction site. <P>COPYRIGHT: (C)2003,JPO

Description

【発明の詳細な説明】Detailed Description of the Invention
【0001】[0001]
【発明の属する技術分野】本発明は、水中埋戻し施工方
法および水中施工用埋戻し材に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an underwater backfilling method and an underwater backfilling material.
【0002】[0002]
【従来の技術】岸壁や護岸を造成する際には、一般に、
地盤沈下防止や空洞充填のために護岸背面等への水中埋
戻し施工が必要とされる。従来の水中埋戻し施工として
は、例えば、現地発生土に硬化液、増粘剤、気泡剤等を
添加したものを埋戻し材として使用し、これを低速度で
打設する方法が開示されている(特許第2864301
号公報)。しかしながら、埋戻し材の打設速度を低速度
にすると、施工に要する日数が増し、施工コストが高く
なるという問題がある。また、増粘材等は高価であり、
且つミキサーに付着しやすく洗浄が必要となり、作業が
煩雑になるという問題がある。
2. Description of the Related Art Generally, when building a quay or a seawall,
In order to prevent ground subsidence and to fill cavities, it is necessary to backfill the back of the seawall with water. As a conventional underwater backfilling construction, for example, a method in which a hardening liquid, a thickener, a foaming agent or the like is added to a locally generated soil as a backfilling material, and this is placed at a low speed is disclosed. (Patent No. 2864301
Issue). However, when the casting speed of the backfill material is set to a low speed, there is a problem that the number of days required for construction increases and the construction cost increases. In addition, thickening materials are expensive,
In addition, there is a problem that it easily adheres to the mixer and requires cleaning, which complicates the work.
【0003】そこで本発明者らは、斯かる水中施工用埋
戻し材の水中分離抵抗性を高めつつ、打設速度を早める
べく、ベントナイト、メタカオリン又はアタパルジャイ
ト等の粘土を含む泥水と、セメントミルクとを別個に調
製し、これらを埋戻しの際に混合しつつ施工するような
二液性の水中施工用埋戻し材、及びその施工方法を発明
するに至った(特開2001−152454)。斯かる
水中施工用埋戻し材及びその施工方法によれば、高速度
で水中に打設しても密度・強度等のバラツキが少なく水
中分離抵抗性が高まるという利点が得られることとな
る。
Therefore, the inventors of the present invention have prepared a muddy water containing clay such as bentonite, metakaolin or attapulgite, and cement milk in order to enhance the resistance to separation in water of such a backfill material for underwater construction and accelerate the casting speed. Has been separately prepared, and a two-component underwater backfill material for underwater construction, in which these materials are mixed and applied during backfilling, and a construction method thereof have been invented (Japanese Patent Laid-Open No. 2001-152454). According to such a backfill material for underwater construction and its construction method, even if it is placed in water at a high speed, there is little variation in density, strength, etc., and the advantage that the resistance to separation in water is enhanced can be obtained.
【0004】しかしながら、該従来技術によれば、水中
施工用埋戻し材の単位体積当たりの水量が多いため、多
量の現場発生土を水中施工用埋戻し材として有効利用す
ることが困難であった。
However, according to the conventional technique, since the amount of water per unit volume of the backfill material for underwater construction is large, it is difficult to effectively use a large amount of onsite soil as the backfill material for underwater construction. .
【0005】[0005]
【発明が解決しようとする課題】そこで、本発明は、多
量の被処理土を添加することができ、同時に高い水中分
離抵抗性を有する水中施工用埋戻し材を提供すること、
及びそのような水中埋戻し施工方法を提供することを課
題とする。
Therefore, the present invention provides a backfill material for underwater construction, to which a large amount of soil to be treated can be added and which at the same time has high resistance to separation in water.
Another object is to provide such an underwater backfilling construction method.
【0006】[0006]
【課題を解決するための手段】前記課題を解決すべく、
本発明は、セメントおよび被処理土を含む硬化液と、ア
タパルジャイトおよびリン酸塩系分散剤を含む可塑化液
とを混合して可塑性の埋戻し材とし、該埋戻し材を水中
の施工場所に注入することを特徴とする水中埋戻し施工
方法を提供する。また、該水中埋戻し施工方法におい
て、前記可塑化液が、アタパルジャイト100重量部に
対してリン酸塩系分散剤を1.2〜4重量部、水を17
0〜500重量部含んでなることを特徴とする。また、
該水中埋戻し施工方法において、前記硬化液が、セメン
ト100重量部に対して被処理土を50〜3000重量
部含んでなることを特徴とする。
[Means for Solving the Problems] To solve the above problems,
The present invention provides a plastic backfill material by mixing a hardening liquid containing cement and treated soil, and a plasticizing liquid containing attapulgite and a phosphate dispersant, and the backfilling material is placed in an underwater construction site. Provided is an underwater backfilling method characterized by injecting. In the underwater backfilling method, the plasticizing liquid contains 1.2 to 4 parts by weight of a phosphate dispersant and 17 parts of water with respect to 100 parts by weight of attapulgite.
It is characterized in that it comprises 0 to 500 parts by weight. Also,
In the underwater backfilling method, the hardening liquid contains 50 to 3000 parts by weight of the treated soil with respect to 100 parts by weight of cement.
【0007】さらに、本発明は、セメントおよび被処理
土を含む硬化液と、アタパルジャイトおよびリン酸塩系
分散剤を含む可塑化液とが、混合されてなることを特徴
とする水中施工用埋戻し材を提供する。
Furthermore, the present invention is a backfill for underwater construction characterized in that a hardening liquid containing cement and treated soil and a plasticizing liquid containing attapulgite and a phosphate dispersant are mixed. Provide the material.
【0008】[0008]
【発明の実施の形態】本発明において、硬化液(A液)
は、セメントと被処理土とを混合してなる懸濁液であ
る。該A液を構成するセメントとしては、普通、早強、
超早強、白色、耐流酸塩、中庸熱、低熱などの各種ポル
トランドセメント、該ポルトランドセメントに高炉スラ
グ、フライアッシュ混合した混合セメント、ジェットセ
メント、アルミナセメントなどの特殊セメント、および
セメント系固化材などを使用することができる。
BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, a curing liquid (liquid A)
Is a suspension obtained by mixing cement and treated soil. As the cement constituting the liquid A, normal, early strength,
Various types of Portland cement such as ultra-fast strength, white color, oxalate resistant, moderate heat, low heat, etc., special cement such as blast furnace slag, fly ash mixed cement, jet cement, alumina cement, etc., and cement-based solidifying material Etc. can be used.
【0009】また、本発明においてA液に添加する被処
理土とは、建設残土、現地発生土、気泡混合土、浚渫
土、フライアッシュなど、微粒分を多く含み、主に泥状
となったものである。該被処理土をA液に用いる際に
は、該被処理土をそのまま用いるか、或いは該被処理土
の含水比を調整して用いてもよい。該被処理土として
は、従来、建設副産物として廃棄処分されていたものに
ついても使用することができる。尚、建設残土や建設発
生土にセメントを添加して調整されたいわゆる「流動化
処理土」については、本発明においてA液としてそのま
ま利用することができる。
In the present invention, the treated soil to be added to the liquid A contains a large amount of fine particles such as construction residual soil, locally-generated soil, bubble-mixed soil, dredged soil, fly ash, etc. It is a thing. When the treated soil is used as the liquid A, the treated soil may be used as it is, or the water content of the treated soil may be adjusted. As the soil to be treated, it is possible to use the soil that has been conventionally discarded as a construction by-product. The so-called "fluidized soil" prepared by adding cement to the remaining construction soil or soil generated after construction can be used as it is as the liquid A in the present invention.
【0010】A液の配合は、セメント100重量部に対
して、被処理土を50〜3000重量部(固形分換
算)、水を20〜1500重量部(前記被処理土中に含
まれる水を含む)とすることが好ましい。A液中に被処
理土を50〜3000重量部(固形分換算)配合するこ
とにより、水中施工用埋戻し材の単位セメント量を維持
して強度を確保しつつ、該被処理土の使用量を増やして
これを有効利用することが可能となる。
The liquid A is mixed in an amount of 50 to 3000 parts by weight of soil to be treated (calculated as solid content) and 20 to 1500 parts by weight of water (water contained in the soil to be treated to 100 parts by weight of cement). Including) is preferable. By mixing 50 to 3000 parts by weight of the treated soil (converted to a solid content) in the liquid A, the amount of the treated soil used while maintaining the unit cement amount of the backfill material for underwater construction and ensuring the strength It becomes possible to increase this and to utilize this effectively.
【0011】また、A液には必要に応じて、減水剤、遅
延剤、分散剤などの混和剤や砂、レキ、発泡ビーズ等を
添加することができ、これによって水中施工用埋戻し材
の単位水量、凝結時間、流動性、および比重の調整を行
うことができる。
If necessary, admixtures such as water-reducing agents, retarders, dispersants, sand, rubs, foam beads, etc. can be added to the liquid A, whereby the backfill material for underwater construction can be prepared. Adjustments to unit water volume, setting time, fluidity, and specific gravity can be made.
【0012】そして、A液を調製する場合には、該A液
のフロー値が160〜350mmとなるようにすること
が好ましい。A液のフロー値が160〜350mmであ
れば、配管による輸送が容易となるだけでなく、B液と
の攪拌混合によって均質な水中施工用埋戻し材が得られ
ることとなる。また、混和剤を用いずに材料分離を防止
する観点よりフロー値を350mm以下とすることが好
ましいが、混和剤などを用いる場合には、この限りでは
ない。
When the solution A is prepared, it is preferable that the flow value of the solution A is 160 to 350 mm. When the flow value of the liquid A is 160 to 350 mm, not only the transportation by piping is easy, but also a homogeneous backfill material for underwater construction can be obtained by stirring and mixing with the liquid B. Further, the flow value is preferably 350 mm or less from the viewpoint of preventing material separation without using an admixture, but this is not the case when an admixture or the like is used.
【0013】一方、B液を構成する可塑化材としては、
アタパルジャイトを使用することが必要である。アタパ
ルジャイトの品質については特に限定はないが、80メ
ッシュふるいを通過するような粒径のものが好ましい。
On the other hand, as the plasticizing material constituting the liquid B,
It is necessary to use attapulgite. The quality of the attapulgite is not particularly limited, but those having a particle size that allows it to pass through an 80 mesh sieve are preferable.
【0014】 また、リン酸系分散剤としては、ピロリ
ン酸ナトリウム、トリポリリン酸ナトリウム、テトラポ
リリン酸ナトリウムを使用することができる。
As the phosphoric acid-based dispersant, sodium pyrophosphate, sodium tripolyphosphate, and sodium tetrapolyphosphate can be used.
【0015】該B液の配合は、アタパルジャイト100
重量部に対して、リン酸系分散剤を1.2〜4重量部と
することが好ましい。このように、アタパルジャイトに
特定量のリン酸系分散剤を添加することにより、アタパ
ルジャイト100重量部に対して水量を200重量部と
いう低い割合とした場合であっても、ダマを生じさせる
ことなく均一な懸濁液とすることができる。即ち、該B
液における水量は、アタパルジャイト100重量部に対
して170〜500重量部、好ましくは170〜300
重量部とすることにより、B液の濃縮を図ることができ
る。
The composition of the liquid B is 100% attapulgite.
The amount of the phosphoric acid-based dispersant is preferably 1.2 to 4 parts by weight with respect to parts by weight. In this way, by adding a specific amount of phosphoric acid-based dispersant to attapulgite, even if the amount of water is as low as 200 parts by weight with respect to 100 parts by weight of attapulgite, it will be uniform without causing lumps. It can be a suspension. That is, the B
The amount of water in the liquid is 170 to 500 parts by weight, preferably 170 to 300 parts by weight with respect to 100 parts by weight of attapulgite.
By adjusting the content to be by weight, the solution B can be concentrated.
【0016】斯かる配合によって調製されたB液は、フ
ロー値が200mm程度のものとなり、圧送に適した流
動性を有するものとなる。そして、前記A液と攪拌混合
した際には、従来と同様に、優れた水中分離抵抗性を付
与するものとなる。
The liquid B prepared by such blending has a flow value of about 200 mm and has fluidity suitable for pressure feeding. Then, when mixed with the liquid A by stirring, excellent separation resistance in water is imparted as in the conventional case.
【0017】本発明に係る水中施工用埋戻し材は、例え
ば、上記のようにして個別に調製されたA液とB液と
が、パイプ等によって別々に施工場所まで圧送された
後、施工場所において瞬時に攪拌混合されてなるもので
ある。A液とB液との混合割合は、使用目的や各液の配
合に応じて適宜決定されるものであるが、A液:B液=
1:0.05〜1:1(体積比)とすることが好まし
い。B液の割合が前記範囲より少ない場合には、可塑化
作用による水中分離抵抗性が低下するおそれがあり好ま
しくない。また、B液の割合が前記範囲より多い場合に
は、単位体積当たりのセメント量が少なくなって強度不
足を招くか、或いは被処理土の使用量を減らす必要があ
るため好ましくない。
The backfill material for underwater construction according to the present invention is, for example, after the A solution and the B solution individually prepared as described above are separately pumped to the construction site by pipes or the like, and then the construction site. In, the mixture is agitated and mixed in an instant. The mixing ratio of the liquid A and the liquid B is appropriately determined according to the purpose of use and the composition of each liquid, but the liquid A: the liquid B =
It is preferably 1: 0.05 to 1: 1 (volume ratio). If the proportion of the liquid B is less than the above range, the resistance to separation in water due to the plasticizing action may be lowered, which is not preferable. On the other hand, if the proportion of the liquid B is higher than the above range, the amount of cement per unit volume is reduced, resulting in insufficient strength, or it is necessary to reduce the amount of the treated soil, which is not preferable.
【0018】また、作製された水中施工用埋戻し材のフ
ロー値は、日本道路公団規格試験法であるシリンダー法
で、80〜150mmが好ましく、80〜120mmが
より好ましい。該フロー値とすることにより、水中への
打設の際に、濁りや材料分離を生じることなく施工する
ことができる。前記A液とB液とを攪拌混合する手段と
しては、A液とB液とを均一に混合できるものを使用で
き、通常、合流管に邪魔板を挿入したスタティックミキ
サーを用いるが、可塑化の程度や現場の状況に応じてモ
ルタルミキサー、ミキサー車などを使用することもでき
る。そして、斯かる水中埋戻し施工方法および水中施工
用埋戻し材は、湾岸部や海洋の人口島などの造成だけで
なく、地下水や流水のある空洞の充填等にも適用するこ
とができる。
The flow value of the prepared backfill material for underwater construction is preferably 80 to 150 mm, more preferably 80 to 120 mm, according to the cylinder method, which is a standard test method of the Japan Highway Public Corporation. By setting the flow value, it is possible to carry out the construction without causing turbidity or material separation at the time of placing into water. As the means for stirring and mixing the liquid A and the liquid B, one capable of uniformly mixing the liquid A and the liquid B can be used, and a static mixer in which a baffle plate is inserted in a confluent pipe is usually used, but Mortar mixer, mixer truck, etc. can be used depending on the degree and the situation of the site. The underwater backfilling method and the backfilling material for underwater construction can be applied not only to the construction of a bay or an artificial island of the ocean, but also to filling a cavity with groundwater or running water.
【0019】また、このようにA液とB液とをパイプ等
によって別々に施工現場まで圧送する方法においては、
施工部位毎の水の有無によってA液のみからなる従来型
の埋戻し材と、A液とB液とを混合した水中施工用埋戻
し材とを容易に切り替えることができる。即ち、水のな
い施工部位には、A液のみを圧送し、水のある施工部位
にはA液とB液両方を圧送して混合すれば、安定した施
工を維持しながら被処理土を含むA液をより多く使用す
ることができる。
In this way, in the method of separately pumping the liquid A and the liquid B to the construction site by a pipe or the like,
It is possible to easily switch between the conventional backfill material consisting of the liquid A and the backfill material for underwater construction in which the liquid A and the liquid B are mixed depending on the presence or absence of water in each construction site. That is, if the solution A is pumped only to the construction site without water and both the solutions A and B are pumped and mixed to the construction site with water, the soil to be treated is contained while maintaining stable construction. More liquid A can be used.
【0020】[0020]
【実施例】以下、実施例および比較例を挙げて本発明に
ついてさらに詳細に説明する。
EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples.
【0021】(実施例1)セメントとして固化材(住友
大阪セメント社製、タフロック3型)を使用し、関東ロ
ーム(千葉県佐倉市で採取、自然含水比113.6%、
土粒子密度2.653g/cm3)に加水混練して作成
したローム泥水を被処理土として使用し、該固化材とロ
ーム泥水とを混合して硬化液(A液)を調製した。ま
た、アタパルジャイトと水とピロリン酸ナトリウムとを
混合して可塑化液(B液)を調製した。そして、該A液
と該B液とを攪拌混合して実施例1の水中施工用埋戻し
材(A液+B液)を作製した。A液およびB液の配合を
表1に示す。
(Example 1) [0021] A solidifying material (manufactured by Sumitomo Osaka Cement Co., Ltd., Tough lock type 3) was used as cement, and Kanto loam (collected in Sakura City, Chiba Prefecture, natural water content ratio 113.6%,
Soil particle density of 2.653 g / cm 3 ) was used as the soil to be treated, which was prepared by hydro-kneading, and the solidifying material was mixed with the loam muddy water to prepare a hardening liquid (Liquid A). Further, attapulgite, water, and sodium pyrophosphate were mixed to prepare a plasticizing liquid (liquid B). Then, the solution A and the solution B were mixed by stirring to prepare a backfill material for underwater construction in Example 1 (solution A + solution B). Table 1 shows the formulations of solutions A and B.
【0022】(実施例2〜4)また、A液の配合および
B液の配合をそれぞれ変化させて実施例2〜4の水中施
工用埋戻し材を作製した。各々の配合を表1に示す。
(Examples 2 to 4) Further, the backfill material for underwater construction of Examples 2 to 4 was produced by changing the composition of the solution A and the composition of the solution B, respectively. The respective formulations are shown in Table 1.
【0023】(実施例5)また、同様にして、被処理土
として粘性土(千葉県手賀沼で採取、自然含水比46.
5%、土粒子密度2.592g/cm3)を用いた場合
の水中施工用埋戻し材を作製した。配合を表2に示す。
(Example 5) Similarly, cohesive soil (collected in Teganuma, Chiba Prefecture, natural moisture content of 46.
A backfill material for underwater construction was prepared using 5% and a soil particle density of 2.592 g / cm 3 . The formulation is shown in Table 2.
【0024】(比較例1)また、前記固化材とローム泥
水とからなるA液のみによって比較例1の水中施工用埋
戻し材を作製した。配合を表1にあわせて示す。
(Comparative Example 1) A backfill material for underwater construction of Comparative Example 1 was prepared using only the liquid A containing the solidifying material and loam mud. The formulation is also shown in Table 1.
【0025】[0025]
【表1】 [Table 1]
【0026】[0026]
【表2】 [Table 2]
【0027】(フロー試験)実施例1〜5および比較例
1の硬化液(A液)および水中施工用埋戻し材(A液+
B液)について、日本道路公団規格「エアモルタル及び
エアミルクの試験方法(JHSA313−1992)」
のコンシステンシー試験方法のシリンダー法により、フ
ロー値を測定した。
(Flow Test) Curing liquid (A liquid) of Examples 1 to 5 and Comparative Example 1 and backfill material for underwater construction (A liquid +
Liquid B), Japan Highway Public Corporation Standard "Test method for air mortar and air milk (JHSA313-1992)"
The flow value was measured by the cylinder method of the consistency test method of.
【0028】(水中分離抵抗性試験)実施例1〜5およ
び比較例1の水中施工用埋戻し材について、土木学会規
準「水中不分離性コンクリートの水中分離度試験方法
(JSCE−D104)」に準じて試験を行い、懸濁物
質量が50mg/l以下の基準を満たすものを○、基準
を満たさないものを×として評価した。
(Underwater Separation Resistance Test) Regarding the backfill materials for underwater construction of Examples 1 to 5 and Comparative Example 1, the Society of Civil Engineers standard “Underwater Separation Test Method for Underwater Non-Separable Concrete (JSCE-D104)” was applied. The test was carried out according to the criteria, and those in which the amount of suspended matter satisfied the criteria of 50 mg / l or less were evaluated as ◯, and those in which the criteria were not satisfied were evaluated as x.
【0029】(強度試験)実施例1〜5および比較例1
の水中施工用埋戻し材を用いてφ5×10cmの供試体
を作製し、水中養生した7日後のものについて、地盤工
学会基準「一軸圧縮試験(JGS0511)」に準じて
一軸圧縮強さを測定した。
(Strength Test) Examples 1 to 5 and Comparative Example 1
Using a backfill material for underwater construction, a φ5 × 10 cm specimen was prepared, and the uniaxial compressive strength of the specimen after 7 days of underwater curing was measured in accordance with the Geotechnical Society standard “Uniaxial compression test (JGS0511)”. did.
【0030】フロー試験、水中分離抵抗性試験および強
度試験の結果を表3に示す。
The results of the flow test, the separation resistance test in water and the strength test are shown in Table 3.
【0031】[0031]
【表3】 [Table 3]
【0032】表3に示した結果によれば、実施例、比較
例いずれの場合においても、A液としてのフロー値は1
60mm以上となっており、圧送する場合に必要な流動
性を有していることが分かる。しかしながら、比較例1
では、該A液をそのまま水中打設しなければならず、こ
のようにフロー値が200mmを越える場合には、水中
における分離抵抗性に劣るものとなる。一方、実施例1
〜5によれば、A液とB液と攪拌混合することにより水
中施工用埋戻し材のフロー値を、いずれも120mm以
下とすることができ、水中分離抵抗性に優れたものとな
っていることが分かる。
According to the results shown in Table 3, the flow value as the liquid A is 1 in both the examples and the comparative examples.
It is 60 mm or more, and it can be seen that it has fluidity necessary for pressure feeding. However, Comparative Example 1
Then, the liquid A must be poured into water as it is, and when the flow value exceeds 200 mm, the separation resistance in water becomes poor. On the other hand, Example 1
According to Nos. 5 to 5, the flow value of the backfill material for underwater construction can be set to 120 mm or less by stirring and mixing the liquid A and the liquid B, and the water separation resistance is excellent. I understand.
【0033】また、7日後の一軸圧縮強さ試験の結果を
比較すると、実施例1〜5の水中施工用埋戻し材は、い
ずれも0.1N/mm2以上の強度が得られており、多
量の被処理土を用いても水中埋戻し材として所定の性能
を有したものとなっていることがわかる。
Comparing the results of the uniaxial compressive strength test after 7 days, the backfill materials for underwater construction of Examples 1 to 5 all had a strength of 0.1 N / mm 2 or more, It can be seen that even if a large amount of treated soil is used, it has a predetermined performance as an underwater backfill material.
【0034】[0034]
【発明の効果】以上のように、本発明に係る水中施工用
埋戻し材および水中埋戻し施工方法によれば、被処理土
の使用量を増やした場合にも、水中分離抵抗性と所定の
強度を確保した水中埋め戻し施工が可能となる。即ち、
現場発生土や流動化処理土など、従来、建設副産物とし
て廃棄処分する必要があったものを有効に利用すること
が可能となる。
As described above, according to the backfilling material for underwater construction and the underwater backfilling method according to the present invention, even if the amount of the treated soil is increased, the water separation resistance and the predetermined value can be obtained. Underwater backfilling that ensures strength is possible. That is,
It becomes possible to effectively use the soil that has conventionally been required to be disposed of as a construction by-product such as the soil generated at the site and the fluidized soil.
フロントページの続き (72)発明者 川上 明大 東京都千代田区六番町6番地28 住友大阪 セメント株式会社内 (72)発明者 吉原 正博 東京都千代田区六番町6番地28 住友大阪 セメント株式会社内 (72)発明者 高橋 秀夫 東京都江東区東陽7−5−8 株式会社エ ステック内 Fターム(参考) 2D043 CA01 EA06 2D045 AA04 BA01 CA00 4H026 CA01 CA06 CB02 CC06 Continued front page    (72) Inventor Meiji Kawakami             28 Sumitomo Osaka, 6-6 Rokubancho, Chiyoda-ku, Tokyo             Inside Cement Co., Ltd. (72) Inventor Masahiro Yoshihara             28 Sumitomo Osaka, 6-6 Rokubancho, Chiyoda-ku, Tokyo             Inside Cement Co., Ltd. (72) Inventor Hideo Takahashi             7-5-8 Toyo, Koto-ku, Tokyo             In the stick F-term (reference) 2D043 CA01 EA06                 2D045 AA04 BA01 CA00                 4H026 CA01 CA06 CB02 CC06

Claims (4)

    【特許請求の範囲】[Claims]
  1. 【請求項1】 セメントおよび被処理土を含む硬化液
    と、アタパルジャイトおよびリン酸塩系分散剤を含む可
    塑化液とを混合して可塑性の埋戻し材とし、該埋戻し材
    を水中の施工場所に注入することを特徴とする水中埋戻
    し施工方法。
    1. A plastic backfill material is obtained by mixing a hardening liquid containing cement and soil to be treated with a plasticizing liquid containing attapulgite and a phosphate dispersant, and the backfilling material is a submerged construction site. A method for backfilling in water, which is characterized by injecting into the ground.
  2. 【請求項2】 前記可塑化液が、アタパルジャイト10
    0重量部に対してリン酸塩系分散剤を1.2〜4重量
    部、水を170〜500重量部含んでなることを特徴と
    する請求項1記載の水中埋戻し施工方法。
    2. The attapulgite 10 is used as the plasticizing liquid.
    The underwater backfilling method according to claim 1, wherein 1.2 to 4 parts by weight of a phosphate dispersant and 170 to 500 parts by weight of water are contained with respect to 0 part by weight.
  3. 【請求項3】 前記硬化液が、セメント100重量部に
    対して被処理土を50〜3000重量部含んでなること
    を特徴とする請求項1又は2に記載の水中埋戻し施工方
    法。
    3. The underwater backfilling method according to claim 1, wherein the hardening liquid contains 50 to 3000 parts by weight of the treated soil with respect to 100 parts by weight of cement.
  4. 【請求項4】 セメントおよび被処理土を含む硬化液
    と、アタパルジャイトおよびリン酸塩系分散剤を含む可
    塑化液とが、混合されてなることを特徴とする水中施工
    用埋戻し材。
    4. A backfill material for underwater construction, comprising a mixture of a hardening liquid containing cement and treated soil and a plasticizing liquid containing attapulgite and a phosphate dispersant.
JP2002062929A 2002-03-08 2002-03-08 Underwater back filling method and underwater back filling material Pending JP2003261941A (en)

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Publication Number Publication Date
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Country Link
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106149738A (en) * 2016-08-22 2016-11-23 中交天航港湾建设工程有限公司 A kind of device and construction method setting filling bag based on enclosed waters location bank of tubes
CN107326909A (en) * 2017-06-10 2017-11-07 中交天航南方交通建设有限公司 A kind of flat board is refuted to drawing jackstone construction method

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106149738A (en) * 2016-08-22 2016-11-23 中交天航港湾建设工程有限公司 A kind of device and construction method setting filling bag based on enclosed waters location bank of tubes
CN107326909A (en) * 2017-06-10 2017-11-07 中交天航南方交通建设有限公司 A kind of flat board is refuted to drawing jackstone construction method

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