JPS62253687A - Grouting process for improving foundation of highly water-permeable ground - Google Patents
Grouting process for improving foundation of highly water-permeable groundInfo
- Publication number
- JPS62253687A JPS62253687A JP6589286A JP6589286A JPS62253687A JP S62253687 A JPS62253687 A JP S62253687A JP 6589286 A JP6589286 A JP 6589286A JP 6589286 A JP6589286 A JP 6589286A JP S62253687 A JPS62253687 A JP S62253687A
- Authority
- JP
- Japan
- Prior art keywords
- cement
- grout
- ground
- viscosity
- water
- 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
Links
- 238000000034 method Methods 0.000 title claims description 13
- 239000011440 grout Substances 0.000 claims abstract description 49
- 239000004568 cement Substances 0.000 claims abstract description 48
- 239000002562 thickening agent Substances 0.000 claims abstract description 20
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 14
- 229920003086 cellulose ether Polymers 0.000 claims abstract description 8
- 239000000463 material Substances 0.000 claims description 12
- 239000000203 mixture Substances 0.000 abstract description 8
- 230000006872 improvement Effects 0.000 abstract description 6
- 230000000694 effects Effects 0.000 abstract description 4
- 239000011398 Portland cement Substances 0.000 abstract description 3
- 229920000609 methyl cellulose Polymers 0.000 abstract description 2
- 239000001923 methylcellulose Substances 0.000 abstract description 2
- 238000012360 testing method Methods 0.000 description 11
- 238000002347 injection Methods 0.000 description 9
- 239000007924 injection Substances 0.000 description 9
- 230000029058 respiratory gaseous exchange Effects 0.000 description 9
- 239000000440 bentonite Substances 0.000 description 6
- 229910000278 bentonite Inorganic materials 0.000 description 6
- SVPXDRXYRYOSEX-UHFFFAOYSA-N bentoquatam Chemical compound O.O=[Si]=O.O=[Al]O[Al]=O SVPXDRXYRYOSEX-UHFFFAOYSA-N 0.000 description 6
- 230000007423 decrease Effects 0.000 description 5
- 239000011230 binding agent Substances 0.000 description 4
- 229920002678 cellulose Polymers 0.000 description 4
- 239000001913 cellulose Substances 0.000 description 4
- 239000004927 clay Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 4
- 238000002474 experimental method Methods 0.000 description 3
- 230000001965 increasing effect Effects 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- 229920002134 Carboxymethyl cellulose Polymers 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000007596 consolidation process Methods 0.000 description 2
- 238000009472 formulation Methods 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000011435 rock Substances 0.000 description 2
- 229920003169 water-soluble polymer Polymers 0.000 description 2
- 235000010627 Phaseolus vulgaris Nutrition 0.000 description 1
- 244000046052 Phaseolus vulgaris Species 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 239000011083 cement mortar Substances 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 239000000084 colloidal system Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 230000002706 hydrostatic effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 125000002496 methyl group Chemical group [H]C([H])([H])* 0.000 description 1
- 235000010981 methylcellulose Nutrition 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 239000004570 mortar (masonry) Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002904 solvent Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 238000011041 water permeability test Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Soil Conditioners And Soil-Stabilizing Materials (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、河川工事、トンネル工事に付帯する地盤改良
のためのグラウト工法に関し、特に高透水性地盤の地盤
改良に実施して好適なグラウト工法に関するものである
。[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a grouting method for ground improvement associated with river construction and tunnel construction, and particularly relates to a grouting method suitable for ground improvement of highly permeable ground. It is related to construction methods.
［従来技術］
グラウチング技術指針には、「ダムグラウトの材料は、
原則としてセメントとする。」と明記されている。これ
はセメントの強度、耐久性、無公害性を重視しているも
のである。このセメントの性質を活かしながら、難グラ
ウチング地盤に対しては、注入材についてもいろいろ工
夫がなされている。[Prior art] The grouting technical guidelines state that ``Dam grout materials must be
As a general rule, use cement. ” is clearly stated. This emphasizes the strength, durability, and pollution-free nature of cement. While taking advantage of the properties of cement, various ideas have been devised regarding injection materials for ground that is difficult to grout.
難グラウチング地盤の一つに、例えば亀裂の多い岩盤あ
るいはルーズな砂礫のような高透水性地盤が挙げられる
。高透水性地盤では静水圧程度の注入でも大暑の注入湯
となり、改良範囲外へ注入材が逸失つし、改良！！囲内
の地盤の空隙以上の注入遇によっても改良されない場合
が多い。Examples of ground that are difficult to grout include highly permeable ground such as rock with many cracks or loose gravel. In highly permeable ground, even injection with a hydrostatic pressure will result in extremely hot injection water, and the injection material will be lost outside the improvement area. ! In many cases, it is not improved even by pouring more than the void in the ground within the enclosure.
これらの高透水性地盤に対するグラウチング方法は、低
圧注入、注入の一時中所などの管理によっても解決しな
い場合もあり、注入材に工夫が必要である。一般には下
記のような注入材が選定される。These grouting methods for highly permeable ground may not solve the problem even with low-pressure injection, temporary injection midpoint control, etc., and it is necessary to devise a suitable injection material. In general, the following injection materials are selected.
■ 急硬性グラウト ＬＷ・デンカＥＳ ｅｔｃ■
高粘性グラウ［・ ベントナイトの混和■ 粗粒グラウ
ト 砂・おがくず・豆・繊維等の混和
■ 低価格グラウト 砂・スラッジ・廃材の混和
■の高粘性グラウトについては、今までベントナイト等
の粘土を混和することによってセメントグラウトに粘性
をましていた。しかし、粘土の産地によって性状が大き
く異なっており、またハンドリングの点でも、ベントナ
イトの溶解楕が必要で、溶解後の経過時囚の違いにより
粘性が大きく変化してしまうものであ、る。■ Rapid hardening grout LW/Denka ES etc■
High viscosity grout [mixing with bentonite■ Coarse grout mixing with sand, sawdust, beans, fibers, etc.■ Low-priced grout mixing with sand, sludge, waste materials■ Until now, clay such as bentonite has been mixed with high viscosity grout. This caused the cement grout to become viscous. However, the properties of the clay vary greatly depending on where it is produced, and in terms of handling, it is necessary to melt bentonite, and the viscosity changes greatly depending on the time after melting.
また、このベントナイト等の粘土を混和したグラウトは
注入中あるいは注入後に粘土とセメントが分離し、固結
強度の得られない部分が存在することになったり、また
分離しない部分においてもセメントグラウトに比べて著
しく固結強度である。In addition, with grout mixed with clay such as bentonite, the clay and cement separate during or after injection, resulting in areas where consolidation strength cannot be obtained, and even in areas where they do not separate, compared to cement grout. It has remarkable consolidation strength.
高透水性地盤においては岩盤の亀裂幅あるいは砂礫の粒
子間隙幅が大きいことから流水抵抗、水圧抵抗などの条
件を考えると、従来の高粘性グラウトのこのような性状
は著しい欠点となる。In highly permeable ground, the width of cracks in the rock or the width of the gaps between grains in sand and gravel are large, so when considering conditions such as water flow resistance and hydraulic resistance, these properties of conventional high-viscosity grouts are a significant drawback.
こうした従来の高粘性グラウトの欠点を補い、セメント
グラウトの特徴である高強度、長期にわたる耐久性、無
公害性を発揮する新しい高粘性グラウト工法の開発が望
まれている。There is a need for the development of a new high-viscosity grouting method that compensates for these shortcomings of conventional high-viscosity grout and exhibits the high strength, long-term durability, and pollution-free nature of cement grout.
［発明の目的］
したがって、本発明の目的は、高透水性の地盤を好適に
改良できるグラウト工法を提供するにある。[Object of the Invention] Therefore, an object of the present invention is to provide a grouting method that can suitably improve highly permeable ground.
［発明の構成］
本発明によれば、セメント・水比が１：１のセメントグ
ラウトを基準として、セメントｆｆ１ｆｆｉに対して０
．１〜１．５ｍｍの水溶性セルロースエーテルを主成分
とする増粘剤を添加して混合し、その混合材を地盤に注
入して地盤改良を行うものである。[Configuration of the Invention] According to the present invention, based on cement grout with a cement/water ratio of 1:1, 0 for cement ff1ffi.
．． A thickener mainly composed of 1 to 1.5 mm of water-soluble cellulose ether is added and mixed, and the mixed material is injected into the ground to improve the ground.
［実施例］
本発明は、基本的には増結剤をセメントグラウトに添加
したものを用いたグラウｉ・工法に係るものであり、本
発明者らは、増結剤につき以下に検討し、実用化試験を
行った。[Example] The present invention basically relates to a grout method using a cement grout in which a binder is added. The test was conducted.
セメントグラウトに増結剤を添加し、粘性が増加すると
、ブリージングの減少が得られる一方で、多少なりとも
強度が低下することは避けられない。Adding binders to cement grouts to increase their viscosity can reduce breathing, but it is inevitable that the strength will be reduced to some extent.
増粘剤がグラウトの主材であるセメントの水和反応を阻
害しないためには、非イオン性であることが望ましい。In order for the thickener not to inhibit the hydration reaction of cement, which is the main material of grout, it is desirable that the thickener be nonionic.
また溶媒となる水に対し溶解性である必要がある。これ
ら性質を満足し、かつ１物に対し無害の確かめられたも
のを増結剤として選定する必要がある。It also needs to be soluble in water, which serves as a solvent. It is necessary to select a thickening agent that satisfies these properties and is confirmed to be harmless to one substance.
高粘性グラウト用として従来から用いらているベントナ
イト以外の増粘剤としては、有機系の水溶性高分子があ
げられ、数多くのものがあるが、セメントグラウトに混
和してで強度面の悪影響がなく、安定した高粘性を発現
するものでなければならない。Thickeners other than bentonite that have traditionally been used for high-viscosity grout include organic water-soluble polymers, and there are many of them, but they have a negative impact on strength when mixed with cement grout. It must exhibit stable and high viscosity.
セルロース系の水溶性高分子はセメントモルタルの保水
剤として、メチルセル１コースの名前で広く知られ普及
している。このうち泥水工法などで広く用いられている
ＣＭＣ（カルボキシル・メチル・セルロース）はセルロ
ース誘導体であるがイオン性であるため、セメント系で
は不溶化し粘性は発現しない。Cellulose-based water-soluble polymers are widely known and popular as methyl cell 1 course as a water retention agent for cement mortar. Among these, CMC (carboxyl methyl cellulose), which is widely used in muddy water construction methods, is a cellulose derivative, but since it is ionic, it becomes insolubilized in cement systems and does not develop viscosity.
したがって、ここではノニオン性セルロース系とアクリ
ル系の市販されている混和剤３Ｉｉを選びだしグラウ■
・性状の予（！試験を行った。Therefore, here we selected commercially available nonionic cellulose-based and acrylic-based admixtures 3Ii.
・Prediction of properties (!Tests were conducted.
この試験結果を第１図および第２図に示す。The test results are shown in FIGS. 1 and 2.
上記の実験の結果、グラウトに使用する混和剤としては
、ハンドリングの点から粘性のある薬剤の「ままこ」の
少ない均一なグラウトとなるセルロース系がまた、その
うちでも商品名アスカクリーンが適していることがわか
った。したがって本発明に係るグラウト工法においては
、水溶性セルロースエーテル（ノニオン性のメチルセル
ロース）を主成分としたアスカクリーンを増結剤として
用いる。As a result of the above experiments, cellulose-based admixtures are suitable for use in grouting because they produce a uniform grout with less viscous "mamako" from the viewpoint of handling, and among these, the product name Asuka Clean is suitable. I understand. Therefore, in the grouting method according to the present invention, Asuka Clean, which is mainly composed of water-soluble cellulose ether (nonionic methylcellulose), is used as a binder.
セメント種類、増結剤添加量、セメント水比を変えて本
発明の有効範囲設定を目的として室内配合試験を行った
。Indoor mixing tests were conducted with the purpose of determining the effective range of the present invention by changing the type of cement, the amount of thickening agent added, and the cement water ratio.
試験配合
セメント種類；普通ポルトランド・早強・コロイド・ス
ーパーファイン
セメント水比：１：１ １：２ １：６増粘剤（アスカ
クリーン）添加１ｉ：ｏｌ、 Ｏ。Test blended cement type: Ordinary Portland, early strength, colloid, super fine cement Water ratio: 1:1 1:2 1:6 Thickener (Asuka Clean) added 1i:ol, O.
５１．０％ただしセメント重量に対するｆｆ１ｆｆｉ百
分率
温度２０℃
測定項目
粘性：Ｐロート Ｂ型回転粘度計
ブリージング率
一輪圧縮強度（２０℃気中養生、材令１・３・７・１４
・２８日）
固結体の透水試験
試験結果を第３図ないし第５図に示す。51.0% However, ff1ffi percentage relative to cement weight Temperature 20℃ Measurement item Viscosity: P funnel B type rotational viscometer Breathing rate Single wheel compressive strength (20℃ air curing, material age 1, 3, 7, 14
・28th) The results of the water permeability test of the solidified bodies are shown in Figures 3 to 5.
増粘材の添加量と粘性の変化
（１） どの種類のセメントに対しても増結効果がある
。Changes in the amount of thickener added and viscosity (1) It has an increasing effect on all types of cement.
セメント重量の１％程度の添加で、Ｗ／Ｃ−１のフロー
ト値は４０〜５０秒程度になる。Addition of about 1% of the weight of cement results in a float value of W/C-1 of about 40 to 50 seconds.
（２） 水セメント比が小さり（薄くセメントミルク）
なると、添加間を増しても粘性があまり上らない。これ
は溶液に対する増粘剤の濃度が低下するためと考えられ
る。(2) Water-cement ratio is small (thin cement milk)
Then, even if the addition interval is increased, the viscosity will not increase much. This is thought to be due to a decrease in the concentration of the thickener in the solution.
（３） 温度５℃の場合において同様の実験を行った結
果、温度が低下すると粘性が増加する。(3) A similar experiment was conducted at a temperature of 5°C, and the results showed that as the temperature decreased, the viscosity increased.
増粘剤の添加間と１リージング率の変化ブリージング率
については、土木学会市販のポリエチレン製袋にて約４
００ｃｃ採取し、Ｐずみ水の体積の比率である。Changes in breathing rate between the addition of thickener and one breathing rate The breathing rate is approximately 4.
00 cc was collected, which is the volume ratio of P-rich water.
（１） どの種類のセメントに対しても添加量を増すと
ブリージング率は小さくなる。(1) The breathing rate decreases as the amount added to any type of cement increases.
（２） 通常使用されているセメントグラウトの配合Ｗ
／Ｃ−１でも、セメント最の０．５％程度の添加でブリ
ージングは５％以下となり、懸濁型の安定グラウトとな
る。(2) Composition W of commonly used cement grout
Even in /C-1, the breathing becomes 5% or less when cement is added at about 0.5%, resulting in a suspension-type stable grout.
（３） どの種類の水セメント比でも増粘剤の添加によ
りブリージング率が減少する。(3) The addition of thickener reduces the breathing rate at any type of water-cement ratio.
以上の試験結果に基づき、本発明はセメント・水比が１
：１のセメントグラウトを基準として、セメント１ｆｆ
ｉに対して０．１〜１．５重量の水溶性セルロースエー
テルを主成分とする増粘剤を添加して混合したものとす
る。水溶性セルロースエーテルを主成分とする増粘剤の
添加間がセメント重量に対して０．１重量以下であると
、所期の目的を達成するための粘性およびブリージング
防止効果が得られず、１．５重通以上であると、粘性が
高くなりすぎ、かつ不経済である。改良地盤の透水係数
にもよるが、普通ポルトランドセメントを使用し、セメ
ント水、比１：１の場合、水溶性セルロースエーテルを
主成分とする増粘剤の添加量は、通常、セメントｆｆ１
ｆｌｉに対して０．５〜１゜０重量とする。Based on the above test results, the present invention has a cement/water ratio of 1.
:Cement 1ff based on 1 cement grout
0.1 to 1.5 weight of a thickener mainly composed of water-soluble cellulose ether is added to and mixed with i. If the addition interval of the thickener mainly composed of water-soluble cellulose ether is less than 0.1 weight based on the weight of cement, the desired viscosity and anti-bleeding effect will not be obtained; If it is more than .5 times, the viscosity becomes too high and it is uneconomical. Although it depends on the hydraulic conductivity of the improved ground, when ordinary Portland cement is used and the cement water ratio is 1:1, the amount of thickener mainly composed of water-soluble cellulose ether added is usually 1:1 to 1:1 to cement water.
The weight should be 0.5 to 1°0 relative to fli.
増結剤の添加間と一軸圧縮強度の変化
誘過ポルトランドセメントにいて述べると、増粘剤を添
加すると一軸圧縮強度は低下している。Changes in unconfined compressive strength induced by addition of thickening agent Regarding Portland cement, the unconfined compressive strength decreases when a thickener is added.
しかし−軸圧縮強度が低下する添加量の範囲は、セメン
ト重量のＯ〜０．５％程度の範囲であり、それ以上添加
しても強度はあまり変らない。これは０．５％程度の添
加でブリージング率が無視できるものとなり、それ以上
の添加によっても変化がないことと一致しているａｏ、
５％以上の添加半時の固結体の比重は、およそ１．５で
一軸圧縮強度は材令９日で５０ Ｄ ｆ ／ ａｊを越
え、材令２８日では概ね１００に９ｆ／ｃｉとなる。However, the range of addition amount in which the axial compressive strength decreases is approximately 0 to 0.5% of the cement weight, and even if it is added beyond that, the strength does not change much. This is consistent with the fact that the breathing rate becomes negligible with the addition of about 0.5%, and there is no change even with the addition of more than that.
The specific gravity of the solids after addition of 5% or more is approximately 1.5, and the unconfined compressive strength exceeds 50 D f / aj at 9 days of age, and approximately 9 f/ci to 100 at 28 days of age. .
ポンプ圧送試験結果
当初強精グラウトは、高粘性であることからポンプ圧送
の際、高圧力となり耐圧の配管設備の必要が１測された
。実験では、耐圧３５ Ｋｙ ｆ ／−のグラウトホー
スを使用したが、圧送用ｗｉ１００ｍで充分に圧送可能
であることが判明した。例えば添加間０．５％（フロー
！ｉ１１：１４．５秒）の配合で、圧力１０Ｋｙｒ／ｄ
のとき流ｆＢ１０１１２／ｍｉｎであり、この配合より
高粘性の添加量１．０％（７〇−値：３８．１秒）の配
合では、圧力１５Ｋｇｆ ／ Ｃｉのとぎ流ｆｆ１９Ｆ
Ｎ！／ｍｉｎであった。As a result of the pumping test, the high viscosity of the grout caused high pressure when it was pumped, making it necessary to use pressure-resistant piping equipment. In the experiment, a grout hose with a pressure resistance of 35 Ky f /- was used, and it was found that the grout hose could be sufficiently pumped with a pressure feed width of 100 m. For example, with a blend of 0.5% (flow! i11: 14.5 seconds) during addition, the pressure is 10 Kyr/d.
The current is fB10112/min, and in a formulation with a higher viscosity addition of 1.0% (70-value: 38.1 seconds), the pressure is 15Kgf/Ci and the flow is ff19F.
N! /min.
ハンドリング
微粒の粉末は、溶解時に粘性のある「ままこ」をつくり
やすい。試験の結果、微粉末のアスカクリーンとセメン
トの粉末の一部または全品によく混合した侵、水に投入
すると、好結果が得られた。Handling: Fine-grained powders tend to form viscous "mamako" when dissolved. As a result of the test, good results were obtained when finely powdered Asuka Clean was thoroughly mixed with some or all of the cement powder and added to water.
従来からあるグラウト材の粘性と、本発明のグラウト工
法に用いる「強精グラウト」の粘性との比較試験を行っ
た。その結果を第６図Ｊ５よび第７図に示す。この図か
ら「強精グラウト」は高粘性を示すセメントベン］・ナ
イトやモルタルよりもはるかに高い粘性を示しているこ
がわかる。従来の高粘性グラウトと本発明のグラウト工
法に用いる「強精グラウトＪとの一軸圧縮強度試験を行
った。A comparative test was conducted to compare the viscosity of conventional grouting materials and the viscosity of the "strong grout" used in the grouting method of the present invention. The results are shown in FIG. 6 J5 and FIG. 7. This figure shows that ``reinforced grout'' exhibits a much higher viscosity than cement benite and mortar, which have high viscosity. A uniaxial compressive strength test was conducted on a conventional high-viscosity grout and a "strong grout J" used in the grouting method of the present invention.
その結果を第８図に示す。この図から従来の高粘性グラ
ウトは、粘性を上げると強度が著しく低下しているのが
わかる。これらの高粘性グラウトでは、セメントベント
ナイトでフロー値１８秒程度の配合が均一なグラウトの
作成の限界と考えられるが、本発明のグラウト工法に用
いる「強精グラウト」の場合これより高粘性でのグラウ
トも作成可能であり、流動性もよい。The results are shown in FIG. This figure shows that the strength of conventional high-viscosity grout decreases significantly as the viscosity increases. For these high-viscosity grouts, a blend with cement bentonite with a flow value of about 18 seconds is considered to be the limit for creating a uniform grout, but in the case of the "reinforced grout" used in the grouting method of the present invention, a blend with a higher viscosity than this is considered to be the limit. Grout can also be made and has good fluidity.
［発明の効果］
本発明に係る高透水性地盤の地盤他車のためのグラウト
工法による長所を要約すれば、次のようである。[Effects of the Invention] The advantages of the grouting method for vehicles on highly permeable ground according to the present invention can be summarized as follows.
（１） 増結剤の添加量を変えることにより、自在に粘
度が変えられる。(1) Viscosity can be freely changed by changing the amount of binder added.
（２） 高粘性においても流動性が充分にある。(2) Sufficient fluidity even at high viscosity.
（３） 高粘性においても充分な強度の発現がある。(3) Sufficient strength is exhibited even at high viscosity.
（４） 材料分離がなく安定したグラウトである。(4) Stable grout with no material separation.
（５） セメント系グラウトであり、無公害Ｃある。(5) It is a cement-based grout and is non-polluting.
（６） 対象地盤の空隙あるいはクラックの大きさに応
じて粘性を適当に定めること
により、注入作業中に温石、圧力をほ
ぼ一定値にフンｌ−Ｇ−ルすることができる。(6) By appropriately determining the viscosity according to the size of the voids or cracks in the target ground, it is possible to maintain the hot stone pressure at a nearly constant value during the pouring operation.
（７） 高い粘性により、グラウトの改良範囲外への逸
出を少なくすることができる。(7) High viscosity can reduce grout migration outside the improvement range.
第１図は増粘剤の選定予備試験結果を示す図、第２図は
強精グラウトとしての評価を示す図、第３図は各種類の
セメントおよびセメント水化に対するアスカ添加量とプ
リージング、プレバクトフロー値、粘度、−軸圧縮強度
の試験結果を示す図、第４図はアスカ添加ｍとＢ型精度
の関係を示す図、第５図は各配合の粘性係数を示す図、
第６図は従来の高粘性グラウトとアスカ添加の強精グラ
ウトとの粘性比較（粘性係数）を示す因、第７図は従来
の高粘性グラウトとアスカ添加の強精グラウトとの粘性
比較（プレバクトフロー値）を示す図、第８図は従来の
高粘性グラウトとアスカ添加の強精グラウトとの粘性（
Ｐ［ｌＩ−ト）と−軸圧縮強度（材令２８日）の関係を
示す図である。
第４図
グラウト用アスカの添加量とＢ型精度の関係第６図
第７図
グラウト材の粘性比較（プレバクドア０−値）第８図
Ｏｔｏ ２０ ３０ リプレバ
クトフロー値（Ｓ）Figure 1 shows the results of a preliminary test for selecting thickeners, Figure 2 shows the evaluation as a toughening grout, and Figure 3 shows the amount of Asuka added to each type of cement and cement hydration, as well as pleating and pre-preparation. Figure 4 shows the relationship between Asuka addition m and Type B accuracy, Figure 5 shows the viscosity coefficient of each formulation,
Figure 6 shows a viscosity comparison (viscosity coefficient) between a conventional high viscosity grout and a reinforced grout with Ascar added. Fig. 8 shows the viscosity (bact flow value) of conventional high viscosity grout and reinforced grout containing Asuka.
It is a figure showing the relationship between P[lI-t) and -axial compressive strength (wood age 28 days). Fig. 4 Relationship between the addition amount of Asuka for grout and B type accuracy Fig. 6 Fig. 7 Comparison of viscosity of grout materials (prevacuo door 0-value) Fig. 8 Oto 20 30 Reprevacuto flow value (S)
Claims (1)
て、セメント重量に対して０．１〜１．５重量の水溶性
セルロースエーテルを主成分とする増粘剤を添加して混
合し、その混合材を地盤に注入して地盤改良を行うこと
を特徴とする高透水性地盤の地盤改良のためのグラウト
工法。Based on cement grout with a cement/water ratio of 1:1, a thickener mainly composed of water-soluble cellulose ether is added and mixed in an amount of 0.1 to 1.5 weight based on the weight of cement. A grouting method for improving highly permeable ground, which is characterized by improving the ground by injecting material into the ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6589286A JPS62253687A (en) | 1986-03-26 | 1986-03-26 | Grouting process for improving foundation of highly water-permeable ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6589286A JPS62253687A (en) | 1986-03-26 | 1986-03-26 | Grouting process for improving foundation of highly water-permeable ground |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS62253687A true JPS62253687A (en) | 1987-11-05 |
Family
ID=13300065
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6589286A Pending JPS62253687A (en) | 1986-03-26 | 1986-03-26 | Grouting process for improving foundation of highly water-permeable ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62253687A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03161613A (en) * | 1989-11-17 | 1991-07-11 | Nippon Kaijo Koji Kk | Technique of improvement of water-bottom ground |
| JPH04166508A (en) * | 1990-10-30 | 1992-06-12 | Jdc Corp | Lightweight, highly fluid reinforcing soil |
| JP2007332593A (en) * | 2006-06-13 | 2007-12-27 | Nittoc Constr Co Ltd | Grouting system and grout |
| JP2014084554A (en) * | 2012-10-19 | 2014-05-12 | Maeda Corp | Ground liquefaction prevention method using high-viscosity fluid material |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217059A (en) * | 1985-07-12 | 1987-01-26 | 三信建設工業株式会社 | Cementitious slurry composition for grout |
-
1986
- 1986-03-26 JP JP6589286A patent/JPS62253687A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6217059A (en) * | 1985-07-12 | 1987-01-26 | 三信建設工業株式会社 | Cementitious slurry composition for grout |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH03161613A (en) * | 1989-11-17 | 1991-07-11 | Nippon Kaijo Koji Kk | Technique of improvement of water-bottom ground |
| JPH04166508A (en) * | 1990-10-30 | 1992-06-12 | Jdc Corp | Lightweight, highly fluid reinforcing soil |
| JP2007332593A (en) * | 2006-06-13 | 2007-12-27 | Nittoc Constr Co Ltd | Grouting system and grout |
| JP2014084554A (en) * | 2012-10-19 | 2014-05-12 | Maeda Corp | Ground liquefaction prevention method using high-viscosity fluid material |
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