JPH03177485A - Drilling stabilizing solution kneaded with seawater - Google Patents
Drilling stabilizing solution kneaded with seawaterInfo
- Publication number
- JPH03177485A JPH03177485A JP31645089A JP31645089A JPH03177485A JP H03177485 A JPH03177485 A JP H03177485A JP 31645089 A JP31645089 A JP 31645089A JP 31645089 A JP31645089 A JP 31645089A JP H03177485 A JPH03177485 A JP H03177485A
- Authority
- JP
- Japan
- Prior art keywords
- seawater
- attapulgite
- bentonite
- parts
- sodium salt
- 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.)
- Granted
Links
- 239000013535 sea water Substances 0.000 title claims abstract description 25
- 230000000087 stabilizing effect Effects 0.000 title abstract description 23
- 238000005553 drilling Methods 0.000 title description 7
- 229960000892 attapulgite Drugs 0.000 claims abstract description 26
- 229910052625 palygorskite Inorganic materials 0.000 claims abstract description 26
- DPXJVFZANSGRMM-UHFFFAOYSA-N acetic acid;2,3,4,5,6-pentahydroxyhexanal;sodium Chemical compound [Na].CC(O)=O.OCC(O)C(O)C(O)C(O)C=O DPXJVFZANSGRMM-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000440 bentonite Substances 0.000 claims abstract description 22
- 229910000278 bentonite Inorganic materials 0.000 claims abstract description 22
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000000203 mixture Substances 0.000 claims abstract description 12
- RTZKZFJDLAIYFH-UHFFFAOYSA-N ether Substances CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 6
- 125000001033 ether group Chemical group 0.000 claims abstract description 6
- 238000006467 substitution reaction Methods 0.000 claims abstract description 6
- 239000004568 cement Substances 0.000 abstract description 21
- 238000002156 mixing Methods 0.000 abstract description 19
- 230000006866 deterioration Effects 0.000 abstract description 5
- 238000011109 contamination Methods 0.000 abstract description 2
- 239000001768 carboxy methyl cellulose Substances 0.000 abstract 2
- 235000019812 sodium carboxymethyl cellulose Nutrition 0.000 abstract 2
- 229920001027 sodium carboxymethylcellulose Polymers 0.000 abstract 2
- 239000003381 stabilizer Substances 0.000 description 24
- 239000007788 liquid Substances 0.000 description 17
- 239000008186 active pharmaceutical agent Substances 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- 239000000463 material Substances 0.000 description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 7
- 229910001868 water Inorganic materials 0.000 description 7
- 238000009412 basement excavation Methods 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 238000001914 filtration Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 5
- 239000003795 chemical substances by application Substances 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 239000012530 fluid Substances 0.000 description 4
- 238000004898 kneading Methods 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000005054 agglomeration Methods 0.000 description 3
- 230000002776 aggregation Effects 0.000 description 3
- 239000004927 clay Substances 0.000 description 3
- 239000013505 freshwater Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000000725 suspension Substances 0.000 description 3
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 2
- 230000002411 adverse Effects 0.000 description 2
- 230000005484 gravity Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 230000003313 weakening effect Effects 0.000 description 2
- 235000006506 Brasenia schreberi Nutrition 0.000 description 1
- 244000267222 Brasenia schreberi Species 0.000 description 1
- 229920000881 Modified starch Polymers 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 229910001424 calcium ion Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 235000012343 cottonseed oil Nutrition 0.000 description 1
- 230000018044 dehydration Effects 0.000 description 1
- 238000006297 dehydration reaction Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- GUJOJGAPFQRJSV-UHFFFAOYSA-N dialuminum;dioxosilane;oxygen(2-);hydrate Chemical compound O.[O-2].[O-2].[O-2].[Al+3].[Al+3].O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O GUJOJGAPFQRJSV-UHFFFAOYSA-N 0.000 description 1
- 239000002270 dispersing agent Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 229910001425 magnesium ion Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 235000019426 modified starch Nutrition 0.000 description 1
- 229910052901 montmorillonite Inorganic materials 0.000 description 1
- CMWTZPSULFXXJA-VIFPVBQESA-N naproxen Chemical compound C1=C([C@H](C)C(O)=O)C=CC2=CC(OC)=CC=C21 CMWTZPSULFXXJA-VIFPVBQESA-N 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 229910000029 sodium carbonate Inorganic materials 0.000 description 1
- 235000017550 sodium carbonate Nutrition 0.000 description 1
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 241000894007 species Species 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000002195 synergetic effect Effects 0.000 description 1
- 239000002562 thickening agent Substances 0.000 description 1
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
- C04B28/001—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 unburned clay
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、海水練り掘削安定液に関し、詳しくは、セメ
ント水和物の混入に対して性能劣化を起こさない海水練
り掘削安定液に関するものである。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a seawater-drilling stabilizing liquid, and more particularly, to a seawater-drilling stabilizing liquid that does not cause performance deterioration when mixed with cement hydrate. be.
地下連続壁構築工事においては坑壁崩壊防止のために掘
削安定液が用いられ、また地下トンネル掘削工事、特に
泥水シールド工法による掘削工事には泥水が用いられて
いる。従来の掘削安定液（以下、単に安定液ともいう）
においては一般に清水が用いられていたが、沖合人工島
構築あるいは海底トンネル構築等の工事においては、こ
れらの工事に用いられる安定液の調製に必要な清水が必
ずしも十分に得られず、安定液のベースとして清水の代
わりに海水の使用が余儀なくされる場合が増大している
。In underground continuous wall construction work, excavation stabilizing fluid is used to prevent pit wall collapse, and muddy water is used in underground tunnel excavation work, especially excavation work using the muddy water shield method. Conventional drilling stabilizing fluid (hereinafter also simply referred to as stabilizing fluid)
However, in construction works such as offshore artificial island construction or undersea tunnel construction, it is not always possible to obtain enough fresh water to prepare the stabilizing liquid used in these works, and the stabilizing liquid is Increasingly, it is necessary to use seawater as a base instead of fresh water.
このように海水を用いる掘削安定液を調製する場合には
、この海水が多量のＣａイオンやＭｇイオン等を含むた
めに、清水中では満足な粘性付与作用を発揮する粘性付
与材でも十分な性能を発揮することができず、また、前
記地下連続壁構築工事における地盤掘削あるいは地盤改
良が施された地盤のシールド掘進のような掘削工事を遂
行する場合には、安定液にセメント水和物が混入して海
水練り安定液の劣化が起こり、その結果、安定液はその
性能を喪失して泥膜を弱化させ、甚だしい場合には溝壁
の崩壊または噴発事故等の重大なトラブルを引き起こす
ので、従来から、海水中でも十分な粘性付与作用を発揮
し、かつ耐セメント性が改善された海水練り安定液の開
発が要望されている。When preparing a drilling stabilizing fluid using seawater in this way, since this seawater contains a large amount of Ca ions, Mg ions, etc., even a viscosity-imparting agent that exhibits a satisfactory viscosity-imparting effect in fresh water may not have sufficient performance. In addition, when performing excavation work such as ground excavation in the underground continuous wall construction work or shield excavation of ground that has been improved, cement hydrate may be added to the stabilizing liquid. This can cause the seawater mixing stabilizer to deteriorate, resulting in the stabilizer losing its performance and weakening the mud film, which in extreme cases can cause serious problems such as collapse of trench walls or blowout accidents. There has been a demand for the development of a seawater mixing stabilizer that exhibits a sufficient viscosity imparting effect even in seawater and has improved cement resistance.
上述のような要望に答えて、海水にモンモリロナイト、
アタパルジャイトまたはセリサイト系の無機質粘土とカ
ルボキシメチルセルロースナトリウム塩を加えてなる安
定液が提案されているけれども（特公昭５７−２５５８
５号公報）、この安定液でも、セメント水和物の混入に
より粘度が低下して、目詰め材の前記無機質粘土が凝集
し、また必要な安定液比重が保持されない結果、逸泥や
泥膜弱化に基づく溝壁崩壊を招くという問題があった。In response to the above requests, we added montmorillonite to seawater.
A stabilizing solution made by adding attapulgite or sericite-based inorganic clay and carboxymethyl cellulose sodium salt has been proposed (Japanese Patent Publication No. 57-2558).
Even in this stabilized liquid, the viscosity decreases due to the mixing of cement hydrate, the inorganic clay of the plugging material aggregates, and the required specific gravity of the stabilized liquid is not maintained, resulting in loss of sludge and mud film. There was a problem in that the groove wall collapsed due to weakening.
そこで、本発明者等は、上述の問題に鑑みて、地盤間隙
の目詰め材としてアタパルジャイトとベントナイトを採
用する一方、粘性付与材として種々のエーテル置換度を
有するカルボキシメチルセルロースナトリウム塩を採用
した海水練り安定液について、その安定液に安定液劣化
の主因となるセメント水和物として微粉状のセメントペ
ースト硬化物（目開き０．８５ｍｍの篩を通過するもの
）を添加してから２〜３日間放置した後に性能を調べる
という条件の下で、その組成、アタパルジャイトとベン
トナイトとの配合比およびカルボキシメチルセルロース
ナトリウム塩のエーテル置換度が安定液のファンネル粘
度、ＡＰＩ濾過試験による脱水量、泥膜の強さおよび耐
セメント性のような安定液の性能に及ぼす影響を種々調
査した結果、（１）アタパルジャイト単独ではセメント
水和物による凝集を起こして、ファンネル粘度（以下、
ＦＶと略す）を大きく低下させる傾向があり、一方ベン
トナイト単独ではセメント水和物による凝集を起こし難
く、またＦＶの低下およびＡＰＩ濾過試験による脱水量
（以下、ＷＬと略す）が少ないけれども、濾過試験にお
いて形成される泥膜が柔らかくて、アタパルジャイト単
独使用の場合に比べて泥膜の強さが小さく、溝壁安定化
の作用が劣ること、
（２）アタパルジャイトとベントナイトとを併用すると
、ＡＰＩ濾過試験による脱水量が小さくなるとともに、
耐セメント性も向上し、さらにＡＰＩ濾過試験において
形成される泥膜の強さが増大し、このようなアタパルジ
ャイトとベントナイトとの相乗作用に基づく改善効果は
アタパルジャイトとベントナイトとの重量による配合割
合が２：１〜１：２であるときに得られること、
（３）セメント水和物がカルボキシメチルセルロースナ
トリウム塩の粘性付与作用を阻害して、安定液の粘性を
低下させ、泥水機能を劣化させる度合は、このカルボキ
シメチルセルロースナトリウム塩のエーテル置換度（以
下、ＤＳと略す）にも依存して、このＤＳが大きくなる
ほど上記の度合は著しくなり、アタパルジャイトとベン
トナイトとを前記の配合比で含み、かつカルボキシメチ
ルセルロースナトリウム塩を含む海水練り安定液におい
て前記のような改善効果を得るためには、カルボキシメ
チルセルロースナトリウム塩のＤＳが１．２以下でなけ
ればならないこと、および
（４）前記のような配合比のアタパルジャイトとベント
ナイトの混合物および前記のようなりＳを有するカルボ
キシメチルセルロースナトリウム塩を含有する海水練り
安定液において前記のような改善効果を得るためには、
さらに、海水１００容量部に対してアタパルジャイトと
ベントナイトの混合物を０．５〜５．０重量部およびＤ
Ｓ＋・２以下のカルボキシメチルセルロースナトリウム
塩を０・３〜１．０重量部含有させなければならないこ
と、を見出した。Therefore, in view of the above-mentioned problems, the present inventors adopted attapulgite and bentonite as fillers for ground gaps, and seawater kneading using carboxymethyl cellulose sodium salts with various degrees of ether substitution as viscosity imparting agents. Regarding the stabilizing liquid, add finely powdered hardened cement paste (those that pass through a sieve with a mesh size of 0.85 mm) as cement hydrate, which is the main cause of stabilized liquid deterioration, and then leave it for 2 to 3 days. Under the conditions that the composition, blending ratio of attapulgite and bentonite, and degree of ether substitution of carboxymethyl cellulose sodium salt were determined after the stabilization, the funnel viscosity of the stabilizer, the amount of water removed by the API filtration test, the strength of the mud film, and the As a result of various investigations into the effects on the performance of stabilizers such as cement resistance, we found that (1) Attapulgite alone causes agglomeration due to cement hydrate, and the funnel viscosity (hereinafter referred to as
On the other hand, bentonite alone is difficult to cause agglomeration due to cement hydrate, and although the decrease in FV and the amount of water removed (hereinafter abbreviated as WL) in the API filtration test are small, the filtration test (2) When attapulgite and bentonite are used in combination, the mud film formed is soft and the strength of the mud film is lower than when attapulgite is used alone, and the effect of stabilizing the groove wall is inferior. The amount of dehydration due to
The cement resistance is also improved, and the strength of the mud film formed in the API filtration test is increased.The improvement effect based on the synergistic effect of attapulgite and bentonite is due to the fact that the weight ratio of attapulgite and bentonite is 2. (3) The degree to which cement hydrate inhibits the viscosity-imparting effect of carboxymethylcellulose sodium salt, lowers the viscosity of the stabilizing liquid, and deteriorates the muddy water function is: , the degree of ether substitution (hereinafter abbreviated as DS) of this carboxymethyl cellulose sodium salt also increases, the higher this DS, the more remarkable the above degree becomes. In order to obtain the above-mentioned improvement effect in a seawater kneading stabilizer containing sodium salt, the DS of carboxymethylcellulose sodium salt must be 1.2 or less, and (4) attapulgite with the above-mentioned blending ratio. In order to obtain the above-mentioned improvement effect in a seawater kneading stabilizer containing a mixture of and bentonite and carboxymethylcellulose sodium salt having S as described above,
Furthermore, 0.5 to 5.0 parts by weight of a mixture of attapulgite and bentonite and D
It has been found that 0.3 to 1.0 parts by weight of carboxymethyl cellulose sodium salt of S+.2 or less must be contained.
本発明は、上記知見に基づいて発明されたもので、耐セ
メント性に優れた海水練り掘削安定液を提供することを
目的とし、
海水１００容量部に対して２：１〜１：２の重量割合の
アタパルジャイトとベントナイトの混合物０・５〜１・
０重量部およびエーテル置換度が１・２以下であるカル
ボキシメチルセルロースナトリウム塩０．３〜１．０重
量部を含有する海水練り掘削安定液、
に係るものである。The present invention was invented based on the above knowledge, and aims to provide a seawater mixing drilling stabilizing liquid with excellent cement resistance. Mixture of attapulgite and bentonite in proportion 0.5~1.
0 parts by weight and 0.3 to 1.0 parts by weight of carboxymethyl cellulose sodium salt having a degree of ether substitution of 1.2 or less.
以下、本発明を具体的に説明する。 The present invention will be specifically explained below.
本発明の安定液において、アタパルジャイトとベントナ
イトとの重量割合が、２：１を越えてアタパルジャイト
が多くなると、セメント水和物との接触またはそれの混
入により凝集が起こりやすくなって、ＦＶの低下が著し
くなり、一方上記割合が１＝２を越えてベントナイトが
多くなると、十分な泥膜の強さが得られないところから
、本発明においてはアタパルジャイトとベントナイトと
の重量による配合割合を２＝１〜１：２と定めた。In the stabilizer of the present invention, if the weight ratio of attapulgite to bentonite exceeds 2:1 and the amount of attapulgite increases, agglomeration tends to occur due to contact with or mixing with cement hydrate, resulting in a decrease in FV. On the other hand, if the above ratio exceeds 1 = 2 and the amount of bentonite increases, sufficient strength of the mud film cannot be obtained. The ratio was set at 1:2.
本発明の安定液において、カルボキシメチルセルロース
ナトリウム塩のＤＳが１．２を越えると、セメント水和
物が混入した場合のＦＶ低下が著しくなるとともにスラ
イム量が増大し、それによってＷＬの増大および懸濁安
定性の悪化を招くところから、本発明ではカルボキシメ
チルセルロースナトリウム塩のＤＳを１．２以下と定め
た。このＤＳはさらに０．８〜１．２であるのが好まし
い。In the stabilizer of the present invention, when the DS of carboxymethyl cellulose sodium salt exceeds 1.2, the FV decreases significantly when cement hydrate is mixed, and the amount of slime increases, resulting in an increase in WL and suspension. In the present invention, the DS of carboxymethylcellulose sodium salt is set to 1.2 or less, since this would lead to deterioration of stability. It is further preferable that this DS is 0.8 to 1.2.
本発明の安定液において、アタパルジャイトとベントナ
イトの混合物の海水１００容量部に対する配合割合が０
．５重量部未満になると、必要な粘性が得ることが困難
になり、かつ地盤間隙の目詰の効果が小さくなるととも
に、ＷＬが大きくなり、一方上記割合が５・０重量部を
越えると、不必要に材料費が高くなるとともに、粘性が
大きくなり過ぎて掘削土砂と安定液との分離に支障をき
たすところから、本発明ではアタパルジャイトとベント
ナイトの混合物の海水１００容量部に対する配合割合を
０．５〜５・０重量部と定めた。この配合割合は好まし
くは１．０〜３．０重量部である。In the stabilizer of the present invention, the blending ratio of the mixture of attapulgite and bentonite to 100 parts by volume of seawater is 0.
．． If it is less than 5 parts by weight, it will be difficult to obtain the necessary viscosity, the effect of clogging the soil gap will be reduced, and the WL will become large. In the present invention, the blending ratio of the mixture of attapulgite and bentonite to 100 parts by volume of seawater is set at 0.5 because the material cost increases and the viscosity becomes too large, which hinders the separation of the excavated soil and the stabilizing liquid. ~5.0 parts by weight. This blending ratio is preferably 1.0 to 3.0 parts by weight.
本発明の安定液において、カルボキシメチルセルロース
ナトリウム塩の海水ｌＯＯ容量容量対する配合割合が０
・３重量部未満になると、安定液の粘性が不足してＷＬ
が増大し、坑壁安定性が不十分となり、一方上記割合が
１・０重量部を越えると、粘性が過度に高くなって掘削
土砂分離上好ましくなく、かつ材料コスト的に不利とな
るところから、本発明ではカルボキシメチルセルロース
ナトリウム塩の海水１００容量部に対する配合割合を０
・３〜１・０重量部と定めた。この配合割合は好ましく
は０．１１〜０・８重量部である。In the stabilizer of the present invention, the blending ratio of carboxymethyl cellulose sodium salt to 100 volume of seawater is 0.
・If the amount is less than 3 parts by weight, the viscosity of the stabilizing liquid will be insufficient and WL
If the above ratio exceeds 1.0 parts by weight, the viscosity becomes excessively high, which is unfavorable for separation of excavated soil and disadvantageous in terms of material cost. In the present invention, the blending ratio of carboxymethylcellulose sodium salt to 100 parts by volume of seawater is 0.
- It was set at 3 to 1.0 parts by weight. This blending ratio is preferably 0.11 to 0.8 parts by weight.
本発明の海水練り掘削安定液中には、従来様々な安定液
に対して、その性能を改変するために加えることが知ら
れている種々の材料または添加剤、例えば市販の変質防
止剤、各燐酸塩等の分散剤、ソーダ灰等のｐＨ調節剤、
綿実しばり滓等の逸泥防止剤およびポリアクリル酸ソー
ダまたは澱粉誘導体等の増粘剤等のうちの１種または２
種以上を必要に応じて添加することができる。The seawater mixing drilling stabilizing liquid of the present invention contains various materials or additives that are known to be added to various stabilizing liquids in order to modify their performance, such as commercially available deterioration prevention agents, etc. Dispersants such as phosphates, pH regulators such as soda ash,
One or two of sludge prevention agents such as cottonseed slag and thickeners such as sodium polyacrylate or starch derivatives.
More than one species can be added as needed.
本発明による海水練り安定液の代表的な組成は次のとお
りである。A typical composition of the seawater kneading stabilizer according to the present invention is as follows.
海水 １００容量部アタパル
ジャイト ０．５〜１．５ 重１部ベントナ
イト ０・５〜１・５重量部カルボキシメ
チルセルロースナトリウム塩ｏ、ｑ〜０．６重量部
本発明の安定液は常法に従って調製することができ、例
えば、海水にカルボキシメチルセルロースナトリウム塩
を溶解させた後、生成した溶液にアタパルジャイトおよ
びベントナイトを投入して、これらを撹拌下に混合する
ことによって調製される。Seawater 100 parts by volume Attapulgite 0.5 to 1.5 parts by weight Bentonite 0.5 to 1.5 parts by weight Carboxymethylcellulose sodium salt o, q to 0.6 parts by weight The stabilizer of the present invention is prepared according to a conventional method. For example, it can be prepared by dissolving carboxymethylcellulose sodium salt in seawater, adding attapulgite and bentonite to the resulting solution, and mixing them under stirring.
ついで、実施例を参照して本発明を説明するが、本発明
は勿論これらの実施例に限定されない。Next, the present invention will be explained with reference to Examples, but the present invention is of course not limited to these Examples.
実施例１
８００ｄの？毎水にＤＳが１．２であるカルボキシメチ
ルセルロースナトリウム塩４ｇを溶解した後、生成した
溶液にそれぞれ第１表に示される配合量のアタパルジャ
イトおよびベントナイトを投入し、家庭用ａキサ−で１
．５分間攪拌することによって、本発明安定液１〜３、
アタパルジャイトとベントナイトとの割合が本発明の範
囲から外れた比較安定液１〜３およびアタパルジャイト
単独を含む従来安定液をそれぞれ調製し、これらの安定
液の比重、ファンネル粘度（ＦＶ）、ＰＨ，ＡＰＩ濾過
試験による脱水量（ＷＬ）、泥膜厚みおよび泥膜強さを
測定した。Example 1 800d? After dissolving 4 g of carboxymethylcellulose sodium salt with a DS of 1.2 in each water, attapulgite and bentonite were added to the resulting solution in the amounts shown in Table 1, and the mixture was mixed with a household axer for 1 hour.
．． By stirring for 5 minutes, stabilizers 1 to 3 of the present invention,
Comparative stabilizers 1 to 3 in which the ratio of attapulgite and bentonite is out of the range of the present invention and a conventional stabilizer containing attapulgite alone were prepared, and the specific gravity, funnel viscosity (FV), PH, and API filtration of these stabilizers were determined. The amount of water removed (WL), mud film thickness, and mud film strength were measured by the test.
ついで、上記各安定液にセメントペースト硬化体微粉末
（目開き０・８５ｍｍの篩を通過するもの）２２ｇを加
えた後、時々攪拌しながら２日間放置し、そのときの各
安定液に関する上記の特性値に加えて、スライム量を測
定した。Next, 22 g of cement paste hardened fine powder (passed through a sieve with a mesh size of 0.85 mm) was added to each of the above stabilizers, and the mixture was left for 2 days with occasional stirring. In addition to the characteristic values, the amount of slime was measured.
以上の測定結果を第１表に示した。The above measurement results are shown in Table 1.
（以下余白）
第１表
且彰ｍｊコ批れる、および水分を多く含み、極めで吹ら
かくて簡単に取れることを意味する。(Hereinafter in the margin) 1st table and sho mj koreru means that it contains a lot of water, is extremely soft, and can be easily removed.
第１表に示される結果から、アタパルジャイトに対し、
本発明の範囲を越えてベントナイトを多く含む比較安定
液１〜３では、セメントペースト硬化体の混入如何に拘
らず、泥膜強さが十分でなく、一方ベントナイトが併用
されないでアタパルジャイト単独を含む従来安定液では
セメントペースト硬化体混入によるＦＶの低下およびＷ
Ｌの増大が著しく、その結果アタパルジャイト微粒子は
凝集し易くなって、その懸濁安定性が劣化するのに対し
、本発明安定液１〜３は、全体としてバランスのとれた
優れた性状を示すばかりでなく、セメントペースト硬化
体の混入によて、ＦＶ、ＷＬおよび泥膜強さが悪影響を
受は難い優れた安定性を発揮することがわかる。From the results shown in Table 1, for attapulgite,
Comparative stabilizers 1 to 3 containing a large amount of bentonite beyond the scope of the present invention did not have sufficient mud film strength regardless of whether or not hardened cement paste was mixed. In the stabilizing liquid, there is a decrease in FV and W due to the contamination of hardened cement paste.
The increase in L is significant, and as a result, the attapulgite fine particles tend to aggregate and their suspension stability deteriorates, whereas the stabilizers 1 to 3 of the present invention show excellent, well-balanced properties as a whole. However, it can be seen that the addition of the hardened cement paste exhibits excellent stability in which FV, WL, and mud film strength are hardly adversely affected.
実施例２
第２表に示されるような種々のＤＳを有するカルボキシ
メチルセルロースナトリウム塩４ｇを８００ ｍｌの海
水に溶解した後、生成した溶液に各々８ｇのアタパルジ
ャイトおよびベントナイトを投入し、家庭用ξキサ−で
１．５分間攪拌することによって、本発明安定液４〜６
および本発明の範囲外のＤＳを有するカルボキシメチル
セルロースナトリウム塩を用いた比較安定液４〜５をそ
れぞれ調製し、ついでこれらの安定液について実施例１
と同様にしてその性状を測定し、この測定結果を第２表
に示した。Example 2 After dissolving 4 g of carboxymethyl cellulose sodium salt having various DS as shown in Table 2 in 800 ml of seawater, 8 g of each of attapulgite and bentonite were added to the resulting solution, and household ξ By stirring for 1.5 minutes at
Comparative stabilizers 4 and 5 using carboxymethylcellulose sodium salt having a DS outside the range of the present invention were prepared, respectively, and then Example 1 was prepared for these stabilizers.
Its properties were measured in the same manner as above, and the measurement results are shown in Table 2.
（以下余白）
第２表
第２表に示される結果から、１・４または１．５のＤＳ
を有するカルボキシメチルセルロースナトリウム塩を用
いた比較安定液４〜５では、セメントペースト硬化体混
入によるＦＶの低下およびＷＬの増大が著しいうえに、
上記硬化体混入後のスライム量が多く、その結果粘土微
粒子が凝集し易くなって、その懸濁安定性が劣化するの
に対し、０．７〜１．２のＤＳを有するカルボキシメチ
ルセルロースナトリウム塩を用いた本発明安定液４〜６
においてはセメントベート硬化体が混入しても満足なＦ
ＶおよびＷＬが保持されるとともに、スライム量が少な
く、上記硬化体による悪影響を受は難い優れた耐セメン
ト性が得られることがわかる。(Left below) From the results shown in Table 2, DS of 1.4 or 1.5
Comparative stabilizers 4 to 5 using carboxymethylcellulose sodium salt having
The amount of slime after mixing the above-mentioned hardened material is large, and as a result, the clay particles tend to aggregate and their suspension stability deteriorates. Stabilizers of the present invention used 4 to 6
In this case, even if cementbate hardened material is mixed in, the F is satisfactory.
It can be seen that V and WL are maintained, the amount of slime is small, and excellent cement resistance is obtained that is hardly affected by the adverse effects of the hardened material.
以上述べた説明から明らかなように、本発明によると、
耐セメント性に優れ、したがって今後も次第に活発化す
ると予想される沖合人工島や海底トンネル等の構築工事
において有利に使用できる海水練り掘削安定液が提供さ
れる。As is clear from the above description, according to the present invention,
Provided is a seawater mixing stabilizing liquid that has excellent cement resistance and can therefore be advantageously used in construction work for offshore artificial islands, undersea tunnels, etc., which is expected to become increasingly active in the future.
手続補正書 平底２年１月３１日 １゜ ２゜ ３゜ ４゜Procedural amendment flat bottom 2 years january 31st 1゜ 2゜ 3゜ 4゜
Claims (1)
アタパルジャイトとベントナイトの混合物０．５〜５．
０重量部およびエーテル置換度が１．２以下であるカル
ボキシメチルセルロースナトリウム塩０．３〜１．０重
量部を含有する海水練り掘削安定液。A mixture of attapulgite and bentonite in a weight ratio of 2:1 to 1:2 based on 100 parts by volume of seawater, 0.5 to 5.
0 parts by weight and 0.3 to 1.0 parts by weight of carboxymethyl cellulose sodium salt having a degree of ether substitution of 1.2 or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316450A JPH0796677B2 (en) | 1989-12-07 | 1989-12-07 | Stabilizer for seawater drilling |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1316450A JPH0796677B2 (en) | 1989-12-07 | 1989-12-07 | Stabilizer for seawater drilling |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH03177485A true JPH03177485A (en) | 1991-08-01 |
| JPH0796677B2 JPH0796677B2 (en) | 1995-10-18 |
Family
ID=18077224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1316450A Expired - Lifetime JPH0796677B2 (en) | 1989-12-07 | 1989-12-07 | Stabilizer for seawater drilling |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0796677B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323674A (en) * | 2021-05-17 | 2021-08-31 | 中铁工程装备集团有限公司 | Intelligent remote control shield tunneling machine and method for simulating 3D test bed |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725585A (en) * | 1980-07-22 | 1982-02-10 | Akihide Tanaka | Square duct |
-
1989
- 1989-12-07 JP JP1316450A patent/JPH0796677B2/en not_active Expired - Lifetime
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5725585A (en) * | 1980-07-22 | 1982-02-10 | Akihide Tanaka | Square duct |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113323674A (en) * | 2021-05-17 | 2021-08-31 | 中铁工程装备集团有限公司 | Intelligent remote control shield tunneling machine and method for simulating 3D test bed |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0796677B2 (en) | 1995-10-18 |
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