JP3423038B2 - Cement admixture for jet grouting method and jet grouting method using the same - Google Patents
Cement admixture for jet grouting method and jet grouting method using the sameInfo
- Publication number
- JP3423038B2 JP3423038B2 JP22163993A JP22163993A JP3423038B2 JP 3423038 B2 JP3423038 B2 JP 3423038B2 JP 22163993 A JP22163993 A JP 22163993A JP 22163993 A JP22163993 A JP 22163993A JP 3423038 B2 JP3423038 B2 JP 3423038B2
- Authority
- JP
- Japan
- Prior art keywords
- cement
- ground
- parts
- jet grouting
- jet
- 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
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/04—Portland cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00732—Uses not provided for elsewhere in C04B2111/00 for soil stabilisation
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/70—Grouts, e.g. injection mixtures for cables for prestressed concrete
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Description
【０００１】[0001]
【産業上の利用分野】本発明は、ジェットグラウト工法
用のセメント混和材、セメント組成物、及びそれを用い
たジェットグラウト工法、詳しくは、地盤中に0.5〜５
ｍ程度の円柱状の硬化体を造成して地盤改良を行う際に
用いる、ジェットグラウト工法用のセメント混和材、セ
メント組成物、及びそれを用いたジェットグラウト工法
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cement admixture for a jet grout method, a cement composition, and a jet grout method using the same, more specifically, 0.5 to 5 in the ground.
The present invention relates to a cement admixture for a jet grout method, a cement composition, and a jet grout method using the same, which are used when a columnar hardened body of about m is formed to improve the ground.
【０００２】[0002]
【従来の技術とその課題】軟弱地盤のように不良地盤を
改良する工法として、最近、ジェットグラウト工法が実
施されている。2. Description of the Related Art Recently, a jet grouting method has been implemented as a method for improving defective ground such as soft ground.
【０００３】ジェットグラウト工法とは、セメントと水
とを混合して混練したセメントミルクを、地中を回転し
ているパイプに導入し、高圧で噴射し、地盤を改良する
工法である。ジェットグラウト工法は大きく二種類に分
けられる。その一つは、空気を伴った超高圧のセメント
ミルクを、地盤中に回転しながら噴射して、地盤を切削
すると同時に、掘削に伴ってでる、掘削土とセメントミ
ルクなどが混合されたスライムを地表に排出し、円柱状
の硬化体を造成するＪＳＧ工法(Jumbo Jet-Special Gro
ut)といわれる工法であり、もう一つは、空気を伴った
超高圧水を地盤中で回転しながら噴射して地盤を切削
し、そのスライムを地表に排出するとともにセメントミ
ルクを同時に充填させＪＳＧ工法より硬化体径が太い円
柱状の硬化体を造成するコラムジェットグラウト工法で
ある(日本ジェットグラウト協会技術資料)。The jet grout method is a method in which cement milk prepared by mixing and kneading cement and water is introduced into a pipe rotating in the ground and injected at high pressure to improve the ground. The jet grout method is roughly divided into two types. One of them is to inject super-high pressure cement milk accompanied by air into the ground while rotating it to cut the ground, and at the same time, to produce slime that is mixed with excavated soil and cement milk, etc. The JSG method (Jumbo Jet-Special Gro) that discharges to the surface of the earth and creates a cylindrical hardened body
ut) is another method, and the other is to inject ultra-high pressure water accompanied by air while rotating in the ground to cut the ground, discharge the slime to the ground surface and simultaneously fill the cement milk with JSG. This is a column jet grout method that creates a columnar hardened body with a larger diameter than the method (Japan Jet Grout Association technical data).
【０００４】しかしながら、これらの工法では、セメン
トミルクを高圧噴射して、粘土を伴った粘性土や、土砂
と混合した際に、粘度が上昇したりして、注入が不完全
となり、地盤を切削した際に発生したスライムが地表に
排出されず、注入圧で地盤が持ち上がったり、地盤改良
されないなどの課題があった。However, in these construction methods, when cement milk is injected at high pressure and mixed with clay-like cohesive soil or clay and sand, the viscosity rises and the injection becomes incomplete, and the ground is cut. There was a problem that the slime generated at the time of doing was not discharged to the surface of the ground, the ground was lifted by the injection pressure, and the ground was not improved.
【０００５】本発明者は、ジェットグラウト工法におけ
る前記課題を解決すべく種々検討を重ねた結果、特定の
セメント組成物を使用することによって、前記課題を解
消し、強固な地盤改良ができる知見を得て本発明を完成
するに至った。The present inventor has conducted various studies to solve the above-mentioned problems in the jet grout method, and as a result, has found that the use of a specific cement composition can solve the above-mentioned problems and make a strong ground improvement. Thus, the present invention has been completed.
【０００６】[0006]
【課題を解決するための手段】即ち、本発明は、リン酸
のナトリウム塩又はカリウム塩、及び硫酸塩を含有して
なり、硫酸塩１００部に対してリン酸塩が１５〜５０部
であることを特徴とするジェットグラウト工法用のセメ
ント混和材であり、セメントと該セメント混和材を含有
してなるジェットグラウト工法用のセメント組成物であ
り、さらには、該セメント組成物と水とを混合してなる
セメントミルクを地盤中に高圧注入して、土砂と混合し
て硬化することを特徴とするジェットグラウト工法であ
る。That is, the present invention relates to phosphoric acid.
Sodium or potassium salts, and Ri Na contain <br/> sulfate, phosphate 15-50 parts per 100 parts of sulfate
A cement admixture for a jet grout method characterized by being a cement composition for a jet grout method containing cement and the cement admixture, and further, the cement composition and water Is a jet grout method characterized by injecting cement milk prepared by mixing the above with high pressure into the ground, mixing with cement and hardening.
【０００７】以下、詳しく本発明を説明する。The present invention will be described in detail below.
【０００８】本発明に係る無機硫酸塩としては、各種硫
酸塩、亜硫酸塩、及び重亜硫酸塩等があり、それらの塩
としては、カルシウム塩、ナトリウム塩、カリウム塩、
及びマグネシウム塩等がある。また、硫酸アルミニウム
カリウムに代表されるミョウバンや、ミョウバン石を焼
成した焼成ミョウバン石などの使用も可能であり、これ
らの内、凝結防止や強度発現性の面から硫酸カルシウム
の使用が好ましい。無機硫酸塩の粒度は、特に限定され
るものではないが、ブレーン値で2,000cm2/g以上が好ま
しい。The inorganic sulfates according to the present invention include various sulfates, sulfites, bisulfites and the like. Those salts include calcium salt, sodium salt, potassium salt,
And magnesium salts. It is also possible to use alum represented by potassium aluminum sulphate or calcined alum stone obtained by calcining alum stone. Of these, calcium sulfate is preferably used from the viewpoints of prevention of coagulation and strength development. The particle size of the inorganic sulfate is not particularly limited, but a Blaine value of 2,000 cm 2 / g or more is preferable.
【０００９】本発明に係るリン酸塩としては、ナトリウ
ム塩やカリウム塩が使用可能であるが、これらの内、凝
結防止や強度発現性の面からリン酸一ナトリウム(NaH2P
O4)の使用が好ましい。リン酸塩の粒度は、特に限定さ
れるものではなく、一般に市販されている製品粒度であ
れば問題なく使用可能であるが、溶解しやすい面から0.
25mm以下が好ましい。リン酸塩の使用量は、無機硫酸塩
100重量部に対して、15〜50重量部である。15重量部未
満ではセメントの凝結を防ぐことが難しく、50重量部を
超えると短期・長期強度発現性が不良となる可能性があ
る。As the phosphate according to the present invention, sodium salts and potassium salts can be used. Among them, monosodium phosphate (NaH 2 P) is used from the viewpoint of preventing coagulation and developing strength.
The use of O 4 ) is preferred. The particle size of the phosphate is not particularly limited, and can be used without any problem as long as it is a product particle size that is generally commercially available, but it is easy to dissolve from the viewpoint of 0.
It is preferably 25 mm or less. The amount of phosphate used is inorganic sulfate
Per 100 parts by weight, 15 to 50 wt parts. If it is less than 15 parts by weight, it is difficult to prevent the setting of cement, and if it exceeds 50 parts by weight, the short-term and long-term strength development properties may be poor.
【００１０】無機硫酸塩とリン酸塩とを含有するセメン
ト混和材の使用量は、セメントとセメント混和材の合計
100重量部に対して、0.5〜15重量部が好ましく、１〜10
重量部がより好ましい。0.5重量部未満ではセメントの
凝結を防ぐことが難しく、15重量部を超えると初期強度
発現性が不良となる可能性がある。The amount of cement admixture containing inorganic sulfate and phosphate is the total amount of cement and cement admixture.
With respect to 100 parts by weight, 0.5 to 15 parts by weight is preferable, 1 to 10
More preferably parts by weight. If it is less than 0.5 part by weight, it is difficult to prevent the setting of cement, and if it exceeds 15 parts by weight, the initial strength development may be poor.
【００１１】セメントとしては、普通、早強、超早強、
及び中庸熱等の各種ポルトランドセメントや、これらの
ポルトランドセメントに高炉スラグ又はフライアッシュ
などを混合した各種混合セメント、並びに、市販の注入
用微粒子セメント等が挙げられる。As cement, normal, early strength, super early strength,
And various portland cements such as moderate heat, various mixed cements obtained by mixing these portland cements with blast furnace slag or fly ash, and commercially available fine particle cements for injection.
【００１２】本発明において使用する水の量は、特に制
限されるものではないが、例えば、セメント組成物100
重量部に対して、50〜300重量部使用することが好まし
い。本発明では、さらに、粘性土や土砂の状態によりベ
ントナイトや減水剤などのセメント混和剤等を、また、
スライムの粘性の低下と強度発現性を向上させる面から
さらにアルカリ炭酸塩を併用することが好ましい。The amount of water used in the present invention is not particularly limited, but for example, the cement composition 100
It is preferable to use 50 to 300 parts by weight based on parts by weight. In the present invention, further, a cement admixture such as bentonite and a water reducing agent depending on the state of cohesive soil and sediment,
From the viewpoint of reducing the viscosity of slime and improving the strength development, it is preferable to further use an alkali carbonate.
【００１３】本発明において、混合・混練条件は、特に
限定されるものではないが、セメント組成物を、例え
ば、回転数10〜500ppm程度で回転するグラウトミキサー
に投入して、あらかじめ混合しておくことが好ましい。In the present invention, the mixing / kneading conditions are not particularly limited, but the cement composition is put into a grout mixer rotating at a rotation number of 10 to 500 ppm and mixed in advance. It is preferable.
【００１４】次に、本発明のジェットグラウト工法用の
セメント組成物を用いたジェットグラウト工法について
説明する。Next, the jet grout method using the cement composition for the jet grout method of the present invention will be described.
【００１５】まず、地盤改良が必要な箇所を削孔する。
削孔深さは、特に制限されるものではないが、例えば、
40ｍ程度が通常行われている。削孔径は、前記ジェット
グラウト工法用のセメント組成物と水とを混合したセメ
ントミルクを噴射する径115〜150mm程度のパイプが挿入
できる大きさがあればよく、特に制限されるものではな
い。次に、その削孔に二重又は三重のパイプを挿入し、
前記セメント組成物からなるセメントミルクを圧送して
噴射する。セメントミルクの圧送には、グラウトポン
プ、超高圧ポンプ、及びコンプレッサー等が用いられ
る。セメントミルクの圧送圧力は、50〜700kgf/cm2程度
が通常行われている。圧送量は、特に制限されるもので
はないが、例えば、30〜200リットル/min程度である。First, a hole that needs to be improved is ground.
The drilling depth is not particularly limited, but for example,
About 40m is usually done. The drilling diameter is not particularly limited as long as it can be inserted into a pipe having a diameter of 115 to 150 mm for injecting cement milk in which the cement composition for the jet grout method and water are mixed. Next, insert a double or triple pipe into the hole,
Cement milk consisting of the cement composition is pressure-fed and jetted. A grout pump, an ultra-high pressure pump, a compressor, and the like are used for pumping cement milk. The pumping pressure of cement milk is usually about 50 to 700 kgf / cm 2 . The pumping amount is not particularly limited, but is, for example, about 30 to 200 liters / min.
【００１６】セメントミルクが充填される円柱状の硬化
体の直径は、地中への充填深度により圧力損失が異な
り、充填深度が15〜40ｍの場合、１〜５ｍ程度である。The diameter of the cylindrical hardened body filled with the cement milk is about 1 to 5 m when the filling depth is 15 to 40 m and the pressure loss varies depending on the filling depth into the ground.
【００１７】[0017]
【実施例】以下、本発明を実施例に基づいてさらに説明
する。EXAMPLES The present invention will be further described below based on examples.
【００１８】実施例１
表１に示す配合のセメント混和材を調整し、セメントと
セメント混和材100重量部に対して、10重量部混合し、
水／セメント組成物比を150％とし、モルタルミキサー
で２分間混合してセメントミルクを調製した。このセメ
ントミルクと粘性土を容積比で、セメントミルク：粘性
土＝0.5：１の割合に配合し、モルタルミキサーで２分
間混合して混合物を作成した。この混合物の粘度をＢ型
粘度計で所定時間測定した。また、この混合物を４×４
×16cmの型枠にいれ、硬化させて作った供試体を使用し
て所定材令の圧縮強度を測定した。結果を表１に併記す
る。Example 1 A cement admixture having the composition shown in Table 1 was prepared and mixed with 10 parts by weight of 100 parts by weight of cement and the cement admixture,
A water / cement composition ratio was set to 150%, and mixed with a mortar mixer for 2 minutes to prepare cement milk. The cement milk and the cohesive soil were mixed in a volume ratio of cement milk: cohesive soil = 0.5: 1 and mixed with a mortar mixer for 2 minutes to prepare a mixture. The viscosity of this mixture was measured with a B-type viscometer for a predetermined time. Also, this mixture is 4 × 4
A compressive strength of a predetermined material was measured by using a test piece prepared by placing it in a mold of × 16 cm and curing it. The results are also shown in Table 1.
【００１９】 ＜使用材料＞ セメント ：電気化学工業社製、普通ポルトランドセメント 無機硫酸塩Ａ：市販無水セッコウ粉砕品、ブレーン値5,500cm2/g 無機硫酸塩B：硫酸ナトリウム、試薬一級 無機硫酸塩Ｃ：硫酸アルミニウムカリウム、試薬一級 リン酸塩ａ ：リン酸一ナトリウム、試薬一級 リン酸塩ｂ ：トリポリリン酸ナトリウム、試薬一級 粘性土 ：石灰石表土、新潟県西頸城郡青海町産、含水比80％<Materials used> Cement: Ordinary Portland cement manufactured by Denki Kagaku Kogyo Co., Ltd. Inorganic sulfate A: Commercial anhydrous gypsum pulverized product, Blaine value 5,500 cm 2 / g Inorganic sulfate B: Sodium sulfate, reagent first-grade inorganic sulfate C : potassium aluminum sulphate, reagents primary phosphate a: sodium phosphate monobasic, reagents primary phosphate b: sodium tripolyphosphate, reagents primary cohesive soil: limestone topsoil, Niigata Prefecture Nishi頸castle County, Qinghai cho, water content of 80%
【００２０】[0020]
【表１】 [Table 1]
【００２１】表１から明らかなように、リン酸塩を使用
しないと流動性がでず、無機硫酸塩とリン酸塩を併用す
ると流動性が付与され、圧縮強度の発現性が良好とな
る。As is clear from Table 1, the fluidity is not obtained without using the phosphate, and the fluidity is imparted when the inorganic sulfate and the phosphate are used in combination, and the compressive strength is exhibited well.
【００２２】実施例２
実施例１表１の実験No.1- 8のセメント混和材を、セメ
ント100重量部に対して５重量部混合し、水／セメント
組成物比150％のセメントミルクを調整し、深さ20ｍ、
注入圧力200kgf/cm2でＪＳＧ工法の施工を実施した。そ
の結果、土壌の硬さを示すＮ値が０の粘性土の地盤で施
工したが、スライムの上昇が極めて良く、スライムは３
時間後でも硬化しなかった。このためスライムの処理が
極めて円滑に行われた。施工後、施工した所を掘削した
ところ、２ｍの径のパイル状硬化体が確認され、材令１
日の圧縮強度は6.3kgf/cm2であり、材令28日の圧縮強度
は21kgf/cm2であった。また、本発明のセメント組成物
を使用してない比較例では、スライムの粘度が上昇し、
流動性がなく、このためスライムがケーシングとの間に
つまりぎみで周囲の地盤が膨張した。さらに、施工１日
後掘削を行ったが、比較例である実験No.1- 2は処理径
が2.2ｍであったが硬化していなかった。圧縮強度は、
材令１日で０kgf/cm2、材令28日で0.8kgf/cm2であっ
た。なお、実験No.1- 1の処理径は0.8ｍと実施例に比べ
著しく小さかった。Example 2 Example 1 5 parts by weight of the cement admixture of Experiment No. 1-8 in Table 1 was mixed with 100 parts by weight of cement to prepare cement milk having a water / cement composition ratio of 150%. Depth of 20m,
The JSG method was applied at an injection pressure of 200 kgf / cm 2 . As a result, it was constructed on the ground of cohesive soil with N value of 0, which indicates the hardness of the soil.
It did not cure after hours. Therefore, the slime treatment was performed extremely smoothly. After the construction, when excavating the constructed place, a pile-like cured body with a diameter of 2 m was confirmed.
The day's compressive strength was 6.3 kgf / cm 2 , and the compressive strength on the 28th day was 21 kgf / cm 2 . Further, in Comparative Examples not using the cement composition of the present invention, the viscosity of the slime increases,
There was no fluidity, which caused the slime to swell between itself and the casing, causing the surrounding ground to expand. Further, excavation was carried out one day after the construction, and in Experiment No. 1-2, which is a comparative example, the treated diameter was 2.2 m, but it was not cured. The compressive strength is
0 kgf / cm 2 in wood age 1 day was 0.8 kgf / cm 2 in wood age 28 days. The treatment diameter of Experiment No. 1-1 was 0.8 m, which was significantly smaller than that of the example.
【００２３】実施例３
実施例１表１の実験No.1- 8のセメント混和材を用い、
セメント100重量部に対するセメント混和材の使用量を
を表２に示すように変化したこと以外は実施例１と同様
に行った。結果を表２に併記する。Example 3 Example 1 Using the cement admixture of Experiment No. 1-8 in Table 1,
Example 1 was repeated except that the amount of the cement admixture used with respect to 100 parts by weight of cement was changed as shown in Table 2. The results are also shown in Table 2.
【００２４】[0024]
【表２】 [Table 2]
【００２５】その結果、本発明のセメント組成物を使用
したスライムの流動性は良好であり、材令１日後の圧縮
強度発現性も良好であった。As a result, the fluidity of the slime using the cement composition of the present invention was good, and the compressive strength development after 1 day of age was also good.
【００２６】実施例４
実施例１表１の実験No.1- 8のセメント混和材を用い、
水・セメント組成物比を表３に示すように変化したこと
以外は実施例１と同様に行った。結果を表３に併記す
る。Example 4 Example 1 Using the cement admixture of Experiment No. 1-8 in Table 1,
Example 1 was repeated except that the water / cement composition ratio was changed as shown in Table 3. The results are also shown in Table 3.
【００２７】[0027]
【表３】 [Table 3]
【００２８】[0028]
【発明の効果】本発明のジェットグラウト工法用のセメ
ント組成物を使用することによって、セメントの凝結の
防止、凝結時間の改善、注入性や充填性の改善等の効果
があり、また、流動性が良好なため、スライムの上がり
が良好である、地盤の膨れがない、スライム処理に人手
がかからない、処理径が大きく定形化した円柱状の硬化
体が形成される等の効果があり、さらには、造成された
硬化体の強度が強いことから、杭の支持力が大きい、セ
メント使用量やセメントペースト注入量を減少でき、施
工速度を速めることが可能となるなどの効果を奏する。 EFFECT OF THE INVENTION By using the cement composition for the jet grout method of the present invention, there are effects such as prevention of setting of cement, improvement of setting time, improvement of injection property and filling property, and fluidity. As a result, the slime rises well, there is no swelling of the ground, there is no need for manipulating the slime treatment, and there is the effect that a cylindrical hardened body with a large treated diameter is formed, and so on. The strength of the hardened body thus formed is strong, so that the pile has a large bearing force, the amount of cement used and the amount of cement paste injected can be reduced, and the construction speed can be increased .
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ Ｃ０９Ｋ 17/08 Ｃ０９Ｋ 17/08 Ｐ 17/10 17/10 Ｐ Ｅ０２Ｄ 3/12 １０１ Ｅ０２Ｄ 3/12 １０１ //(Ｃ０４Ｂ 28/02 Ｃ０４Ｂ 22:14 Ａ 22:14 Ｂ 22:16 Ａ 22:16 14:10 Ｚ 14:10） 103:22 103:22 103:30 103:30 Ｃ０９Ｋ 103:00 Ｃ０９Ｋ 103:00 (58)調査した分野(Int.Cl.7，ＤＢ名) C04B 22/14 C04B 22/16 C04B 28/02 C09K 17/02 C09K 17/06 C09K 17/08 C09K 17/10 E02D 3/12 101 ─────────────────────────────────────────────────── ─── Continued Front Page (51) Int.Cl. 7 Identification Code FI C09K 17/08 C09K 17/08 P 17/10 17/10 P E02D 3/12 101 E02D 3/12 101 // (C04B 28 / 02 C04B 22:14 A 22:14 B 22:16 A 22:16 14:10 Z 14:10) 103: 22 103: 22 103: 30 103: 30 C09K 103: 00 C09K 103: 00 (58) Field (Int.Cl. 7 , DB name) C04B 22/14 C04B 22/16 C04B 28/02 C09K 17/02 C09K 17/06 C09K 17/08 C09K 17/10 E02D 3/12 101
Claims (3)
及び硫酸塩を含有してなり、硫酸塩１００部に対してリ
ン酸塩が１５〜５０部であることを特徴とするジェット
グラウト工法用のセメント混和材。1. A sodium salt or potassium salt of phosphoric acid,
And Ri Na contain sulfate, Li per 100 parts of sulfate
A cement admixture for the jet grout method , characterized in that the phosphate is 15 to 50 parts .
材を含有してなるジェットグラウト工法用のセメント組
成物。2. A cement composition for a jet grout method, which comprises cement and the cement admixture according to claim 1.
のセメント組成物と水とを混合して混練したセメントミ
ルクを、地盤中に高圧注入して、土砂と混合して硬化す
ることを特徴とするジェットグラウト工法。3. A cement milk prepared by mixing and kneading the cement composition for jet grouting method according to claim 2 and water, is injected into the ground under high pressure, and is mixed with earth and sand to be hardened. Jet grout method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22163993A JP3423038B2 (en) | 1993-09-07 | 1993-09-07 | Cement admixture for jet grouting method and jet grouting method using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22163993A JP3423038B2 (en) | 1993-09-07 | 1993-09-07 | Cement admixture for jet grouting method and jet grouting method using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0769695A JPH0769695A (en) | 1995-03-14 |
| JP3423038B2 true JP3423038B2 (en) | 2003-07-07 |
Family
ID=16769933
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22163993A Expired - Fee Related JP3423038B2 (en) | 1993-09-07 | 1993-09-07 | Cement admixture for jet grouting method and jet grouting method using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3423038B2 (en) |
-
1993
- 1993-09-07 JP JP22163993A patent/JP3423038B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0769695A (en) | 1995-03-14 |
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