JPH02112517A - Composite grouting technique using dual pipe - Google Patents
Composite grouting technique using dual pipeInfo
- Publication number
- JPH02112517A JPH02112517A JP63266746A JP26674688A JPH02112517A JP H02112517 A JPH02112517 A JP H02112517A JP 63266746 A JP63266746 A JP 63266746A JP 26674688 A JP26674688 A JP 26674688A JP H02112517 A JPH02112517 A JP H02112517A
- Authority
- JP
- Japan
- Prior art keywords
- grout
- pipe
- setting
- injection
- ground
- 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 29
- 239000002131 composite material Substances 0.000 title claims description 7
- 230000009977 dual effect Effects 0.000 title 1
- 239000011440 grout Substances 0.000 claims abstract description 86
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 24
- 238000002347 injection Methods 0.000 claims description 85
- 239000007924 injection Substances 0.000 claims description 85
- 239000007788 liquid Substances 0.000 claims description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 8
- 238000001879 gelation Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 6
- 239000000499 gel Substances 0.000 description 5
- 229910052751 metal Inorganic materials 0.000 description 5
- 239000002184 metal Substances 0.000 description 5
- NBIIXXVUZAFLBC-UHFFFAOYSA-N Phosphoric acid Chemical compound OP(O)(O)=O NBIIXXVUZAFLBC-UHFFFAOYSA-N 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 description 3
- XEKOWRVHYACXOJ-UHFFFAOYSA-N Ethyl acetate Chemical compound CCOC(C)=O XEKOWRVHYACXOJ-UHFFFAOYSA-N 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000004576 sand Substances 0.000 description 3
- WCUXLLCKKVVCTQ-UHFFFAOYSA-M Potassium chloride Chemical compound [Cl-].[K+] WCUXLLCKKVVCTQ-UHFFFAOYSA-M 0.000 description 2
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 229910000147 aluminium phosphate Inorganic materials 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- -1 ethyl acetate Chemical class 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000005086 pumping Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 description 1
- VMHLLURERBWHNL-UHFFFAOYSA-M Sodium acetate Chemical compound [Na+].CC([O-])=O VMHLLURERBWHNL-UHFFFAOYSA-M 0.000 description 1
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002378 acidificating effect Effects 0.000 description 1
- 150000007513 acids Chemical class 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 239000002075 main ingredient Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
- 235000011164 potassium chloride Nutrition 0.000 description 1
- 239000001103 potassium chloride Substances 0.000 description 1
- RUOJZAUFBMNUDX-UHFFFAOYSA-N propylene carbonate Chemical compound CC1COC(=O)O1 RUOJZAUFBMNUDX-UHFFFAOYSA-N 0.000 description 1
- 230000002787 reinforcement Effects 0.000 description 1
- 239000001632 sodium acetate Substances 0.000 description 1
- 235000017281 sodium acetate Nutrition 0.000 description 1
- 229910052938 sodium sulfate Inorganic materials 0.000 description 1
- 235000011152 sodium sulphate Nutrition 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 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」
この発明は、軟弱地盤の止水や地盤強化を目的として行
うグラウト注入工法に関し、特に内管、外管とからなる
二重管を用いてゲル化時間の異なる瞬結グラウトと緩結
グラウトを交互に注入する複合注入工法に関するもので
ある。[Detailed Description of the Invention] "Industrial Application Field" This invention relates to a grout injection method for the purpose of water stoppage and ground reinforcement in soft ground, and in particular, the grout injection method using a double pipe consisting of an inner pipe and an outer pipe. This relates to a composite injection method in which instant setting grout and slow setting grout with different gelation times are alternately injected.
「従来の技術、発明が解決せんとする問題点」近年、グ
ラウト注入工法は、二重管（詳しくは二重管ロッド）を
用いた複合注入工法が、簡単な装置で最も合理的な注入
工法として、多くの現場で使用されるようになってきた
。``Prior art and problems to be solved by the invention'' In recent years, the grout injection method has become more efficient, with the compound injection method using double pipes (more specifically, double pipe rods) being the most rational method using simple equipment. As such, it has come to be used in many workplaces.
すなわち、二重管Ｏラド（先端にメタルクラウン装着）
を用いて、注入位置まで空孔し、空孔に用いた二重管ロ
ッドをそのまま注入管として用い、まず空孔時に生じた
注入管周囲の間隙や、地盤内の大きな間隙や弛い部分に
ゲル化時間（通常３０秒程度以下）が短くホモゲル強度
の大きい瞬結グラウトを充填（主効果はグラウトバッカ
ー）し、次にゲル化時間の長い（通常１〜２分以上）の
緩結グラウトを地盤の小さい間隙や密な部分に浸透させ
て、地盤全体を均一に固結し、止水や地盤強化を図るグ
ラウト注入工法である。In other words, double tube O-rad (metal crown attached to the tip)
Using the hole, make a hole up to the injection position, use the double pipe rod used for the hole as the injection pipe, and first fill in the gap around the injection pipe that was created when the hole was made, or the large gap or loose part in the ground. Fill with instant setting grout that has a short gelation time (usually about 30 seconds or less) and high homogel strength (main effect is grout backer), then fill with slow setting grout that has a long gelation time (usually 1 to 2 minutes or more). This is a grout injection method that infiltrates small gaps and dense areas in the ground to uniformly solidify the entire ground, stopping water and strengthening the ground.
また、複合注入工法に使用する瞬結並びに緩結グラウト
の注入システムは、いろいろな方法があるが、その中で
も合理的な方法は、二重管のいずれかの管路に縁結グラ
ウトを通し、瞬結グラウトは前記緩結グラウトに他方の
管路から急結剤を通して、両液を合流させる方法であり
本発明もこの方法に属するものである。In addition, there are various methods for injection systems for instant setting and slow setting grout used in the composite injection method, but the most reasonable method is to pass edged grout through one of the pipes of the double pipe, Instant setting grouting is a method in which a quick setting agent is passed through the slow setting grout from the other pipe line and the two liquids are combined, and the present invention also belongs to this method.
このような注入システムを実施するために従来は、下記
に示すような先端装置及び注入工法（特に瞬結グラウト
の合流方法）が実用化されているが、いずれのものも欠
点がある（図は緩結グラウトの合流方法を模式的に示し
たものである。なお、先端装置の構造的部分は省略しで
ある。）
＋１）イ方法
この方法は、もつとも簡単な装置で二重管ロッドをその
まま用いるもので第３図に示す。In order to implement such injection systems, the following advanced devices and injection methods (particularly the merging method of flash setting grout) have been put into practical use, but all of them have drawbacks (the figure shows This is a schematic illustration of the method of merging loosely set grout.The structural part of the tip device is omitted.) +1) Method A This method uses a very simple device to connect the double pipe rod as it is. The device used is shown in Figure 3.
外管１の先端にメタルクラウン３を装着し、内管２は、
外管ｌより短く先端部には混合室４が設けられている。A metal crown 3 is attached to the tip of the outer tube 1, and the inner tube 2 is
A mixing chamber 4 is provided at the tip, which is shorter than the outer tube 1.
しかし実際には、注入時には加圧状態であるため、縁結
グラウトＡと急結剤Ｂは同一方向に平行して吐出される
ため、注入管内では緩結グラウトＡと急結剤Ｂの接触面
の一部は混合されるが、多くは混合されることなく注入
管外に放出され、地盤中で徐々（時間差）に混合する形
態をとるため、ゲル化時間がバラついて均一なものが得
られ難いという欠点があった。However, in reality, because the pressure is applied during injection, edge-setting grout A and quick-setting agent B are discharged in parallel in the same direction. Some of it is mixed, but most of it is released outside the injection pipe without being mixed, and because it mixes gradually (with a time difference) in the ground, the gelation time varies and a uniform product is not obtained. The drawback was that it was difficult.
また、ゲル化時間が極端に短い（例えば、数秒以下）場
合には、単純な構造の混合室といえども注入管内で局部
的にゲル化したものが邪魔となって、緩結グラウトの注
入が困難になってしまうという欠点、あるいは管壁に付
着したものが次第に堆積し、閉塞現象を起こすことが多
いというような欠点があった。In addition, if the gelation time is extremely short (for example, several seconds or less), even if the mixing chamber has a simple structure, locally gelled material in the injection pipe will interfere with the injection of slow-setting grout. The disadvantages are that it becomes difficult to use, or that things that adhere to the tube wall gradually accumulate, often causing a clogging phenomenon.
（２１０方法（第４．５図）
この四方法は、注入管内において緩結グラウトＡと急結
剤Ｂを特殊な装置を用いて混合した後、注入管（外管）
の壁面（図４）の注入孔５あるいは外管より突き出た内
管（図５）の注入孔５より瞬結グラウトを注入する工法
である。(210 method (Figure 4.5)) These four methods involve mixing slow-setting grout A and quick-setting agent B in the injection pipe using a special device, and then
This is a construction method in which instantaneous setting grout is injected through the injection hole 5 in the wall surface (Fig. 4) or the injection hole 5 in the inner pipe (Fig. 5) protruding from the outer pipe.
この四方法は、イ方法に比べて注入管内に十分に混合さ
れるため、この点については特に問題はない。In these four methods, there is no particular problem in this respect because the mixture is more thoroughly mixed in the injection tube than in method A.
しかしながら、通常二重管に用いる二重管ロッドは、外
径４０．５■園（内径３８．５１−）と小さく、さらに
この中に鋼鉄製の内管があり、この外管と内管を接続し
た混合機能を有した特種な先端装置を内蔵し、さらに注
入管空孔時には外管を通じたポーリング水が下方に放出
できる機能を兼ね備えた複雑な装置からなっている。However, the double pipe rod normally used for double pipes is small with an outer diameter of 40.5 mm (inner diameter 38.51 mm), and there is also a steel inner tube inside the rod, which connects the outer and inner tubes. It is a complex device that has a built-in special tip device with a connected mixing function, and also has a function that allows polling water to be discharged downward through the outer tube when the injection tube is empty.
このことは、先端装置が非常に高価になる欠点があり、
また複雑な装置からなっているのでグラウト流路が非常
に小さいものとなり、特にゲル化時間が非常に短い瞬結
グラウトの場合は注入管内を閉塞（ゲル化）して縁結グ
ラウトの吐出を妨げるか、注入管内を完全に閉塞しなく
てもゲルの一部が装置内に付着することは避けられず、
したがって続いて送液されるグラウトの内圧が高まり、
地盤中への注入圧を正確に読取ることは不可能となる等
の欠点がある。This has the disadvantage that advanced equipment becomes very expensive.
In addition, since it consists of a complicated device, the grout flow path is very small, and especially in the case of instant setting grout, which has a very short gelation time, it will block (gel) the inside of the injection pipe and prevent the discharge of edged grout. Or, even if the inside of the injection tube is not completely occluded, it is inevitable that some of the gel will adhere to the inside of the device.
Therefore, the internal pressure of the grout that is subsequently pumped increases,
There are drawbacks such as the impossibility of accurately reading the injection pressure into the ground.
「問題点を解決するための手段」
この発明は前記従来の課題を解決するために前記内管の
先端が外管より長く形成され、また内管の先端部は閉塞
し、内管壁面に複数の注入孔を設け、外管の先端には吐
出口を有する装置を用い、この内管、外管のいずれかの
流路に縁結グラウト、残りの流路に急結剤を送液し、両
者を注入管外で合流させてなる瞬結グラウトを注入管周
囲や地盤の大きい間隙に注入し、次に前記急結剤の合流
を中止して、縁結グラウトを地盤の小さい間隙に注入す
ることにより、注入管外の地盤に設けられた人工的な混
合室（空洞部）において緩結グラウトと急結剤とを直角
に合流させるため、非常に均一な瞬結グラウトが得られ
、また管外混合であるため、ゲル化時間が非常に短い瞬
結グラウトでも管内混合とは異なり、何ら制約されるこ
ともなく、どのような土地条件にでも対処できる優れた
グラウトが得られ、さらに注入管外での混合であるため
。"Means for Solving the Problems" In order to solve the above-mentioned conventional problems, the present invention provides that the distal end of the inner tube is formed longer than the outer tube, the distal end of the inner tube is closed, and a plurality of Using a device with an injection hole and a discharge port at the tip of the outer tube, the edge grout is sent to either the inner or outer tube channel, and the quick-setting agent is sent to the remaining channel, Instant setting grout, which is made by merging both outside the injection pipe, is injected into the area around the injection pipe and into large gaps in the ground, then the merging of the quick setting agent is stopped, and edge bonding grout is injected into small gaps in the ground. This allows the slow-setting grout and quick-setting agent to meet at right angles in an artificial mixing chamber (cavity) installed in the ground outside the injection pipe, resulting in a very uniform instant-setting grout. Because it is externally mixed, unlike in-tube mixing, even instant setting grout with a very short gelation time is not subject to any restrictions, making it possible to obtain an excellent grout that can be used in any land conditions. Because it is mixed outside.
先端装置が簡単かつ安価で、作動のトラブルなく円滑に
施工することを可能とした複合注入工法を提案するもの
である
「実施例」
以下この発明を図面に示す実施例について説明すると、
本発明に用いる先端装置は第１図に示すように外管１と
内管２とからなる二重管の外管ｌの先端にメタルクラウ
ン３が装着され、内管２の先端部中にその内管の延長と
しての注入部内管２°がスライド自在に内装されており
この注入部内管２°はその先端部が閉鎖され壁面には注
入孔４が設けられており、注入の際には内管２中に送液
されたグラウトの液圧により外管１の先端吐出口部５よ
り前方に押し出されるように構成されている。``Example'' which proposes a composite injection method in which the advanced device is simple and inexpensive, and allows smooth construction without any trouble in operation.Hereinafter, an example of this invention shown in the drawings will be explained.
As shown in FIG. 1, the tip device used in the present invention is a double tube consisting of an outer tube 1 and an inner tube 2. A metal crown 3 is attached to the tip of the outer tube 1, and a metal crown 3 is attached to the tip of the inner tube 2. An injection section inner tube 2°, which is an extension of the inner tube, is slidably installed inside the injection section. The grout is configured to be pushed forward from the distal end outlet portion 5 of the outer tube 1 by the hydraulic pressure of the grout fed into the tube 2.
この注入部内管２°の壁面に設ける注入孔４の位置や数
は特定されるものではないが、１個から複数個、好まし
くは２〜６個設けることが注入に伴う管内抵抗を小さく
押えられ、かつ安定した管内抵抗値となることから好ま
しい。Although the position and number of the injection holes 4 provided on the wall surface of the inner tube 2° of the injection section are not specified, it is preferable to provide one to a plurality of injection holes, preferably two to six, in order to keep the resistance inside the tube small due to injection. , and a stable pipe resistance value, which is preferable.
また、本発明の先端装置の外管部（外管流路又はその先
端吐出口部５）には、必要に応じて注入管外からのグラ
ウト等の逆流などを防止するための逆止弁を設けること
ができる。In addition, the outer pipe part (the outer pipe flow path or its distal end outlet part 5) of the tip device of the present invention is provided with a check valve to prevent backflow of grout etc. from outside the injection pipe, if necessary. can be provided.
次に、上記注入管による本発明の注入施工について、工
程順に説明する。Next, the injection work of the present invention using the above-mentioned injection pipe will be explained in order of steps.
（１）先ず第２図（ａ）に示すように、上記二重管ロッ
ドを用いて外管ｌの流路６にポーリング水を送水しなが
ら注入位置まで全孔する。(1) First, as shown in FIG. 2(a), while supplying polling water to the channel 6 of the outer tube 1 using the double tube rod, all the holes are made to the injection position.
（３）次に第３図（ｂ）に示すように、注入管全体を内
管２中の注入部内管２゛を押し出すに充分な位置まで引
き上げ（引き戻し） 引き上げ跡には空洞７が残ること
になる。(3) Next, as shown in Fig. 3(b), pull up (pull back) the entire injection tube to a position sufficient to push out the injection section inner tube 2'' in the inner tube 2, leaving a cavity 7 in the pulled up position. become.
（４）この状態で第３図（Ｃ）に示すように、内管２の
流路６°に緩結グラウトＡを圧送し、内管２内に装填さ
れている注入部内管２°を緩結グラウトＡの液圧で外管
１の先端前方に押し出し、この緩結グラウトＡを注入部
内管２°の注入孔４から軸方向にほぼ直角に吐出させる
と同時に、外管ｌの流路６に圧送された急結剤Ｂを外管
１の先端の吐出口部５より軸方向前方に吐出させ、両液
を交差状に合流させる。(4) In this state, as shown in Fig. 3(C), loosely set grout A is fed under pressure into the flow path 6° of the inner tube 2, and the injection part inner tube 2° loaded in the inner tube 2 is loosened. The loosely set grout A is pushed out to the front of the tip of the outer tube 1 by the hydraulic pressure of the loosely set grout A, and is discharged from the injection hole 4 in the inner tube 2° of the injection part almost at right angles to the axial direction. The quick-setting agent B that has been pressure-fed is discharged forward in the axial direction from the discharge port 5 at the tip of the outer tube 1, and the two liquids are merged in a cross shape.
この場合、注入部内管２°は、緩結グラウトＡの圧送前
に水を圧送することによりその液圧で突出させても良い
。In this case, the injection part inner pipe 2° may be caused to protrude by the hydraulic pressure by pumping water before the loose setting grout A is pumped.
そして、緩結グラウトＡ及び急結剤Ｂは空洞７内にそれ
ぞれ吐出し、この空胴７を地盤内に設けた人工的混合室
として緩結グラウトＡと急結剤Ｂが直角にて合流されて
得られた瞬結グラウトが注入管周囲の大きな隙間及び地
盤の大きな間隙や弛い部分に注入される。Then, the slow-setting grout A and quick-setting agent B are each discharged into the cavity 7, and this cavity 7 serves as an artificial mixing chamber provided in the ground, where the slow-setting grout A and quick-setting agent B are joined at right angles. The instant-setting grout obtained is injected into large gaps around the injection pipe and into large gaps and loose parts of the ground.
（５）続いて第３図（Ｃ）の状態において、（４）の急
結剤Ｂの合流を中止し、縁結グラウトＡのみを瞬結グラ
ウトが注入し得なかった地盤の小さい間隙や弛い部分に
注入する。(5) Next, in the state shown in Figure 3 (C), stop the merging of the quick setting agent B in (4) and apply only the edge bonding grout A to small gaps in the ground where the quick setting grout could not be injected or Inject into the affected area.
（６）次に注入管を所定位置まで引き上げ（引き戻し）
で前記＋４１ 、 （５１の工程を行い、この工程を連
続的に行うことを特徴とする複合注入工法である。(6) Next, pull the injection tube up to the specified position (pull back)
This is a composite injection method characterized by carrying out the above-mentioned +41 and (51 steps) and performing these steps continuously.
以上に本発明工法を順を追って説明したが、本発明の最
も特徴とすることは、（４）の示す縁結グラウトＡと急
結剤Ｂの合流方法である。The construction method of the present invention has been explained step by step above, but the most distinctive feature of the present invention is the method of merging the edge-joining grout A and quick-setting agent B shown in (4).
すなわち、注入管外の地盤に設けられた人工的な混合室
（空洞７）において、両液を直角に合流させるため、非
常に均一な瞬結グラウトが得られることである。That is, since both liquids are joined at right angles in an artificial mixing chamber (cavity 7) provided in the ground outside the injection pipe, a very uniform instantaneous grout can be obtained.
また、管外混合であるため、ゲル化時間が非常に短い瞬
結グラウトでも管内混合とは異なり何ら制約されること
もなく、どのような土地条件にでも対処できる優れたグ
ラウトが得られる。In addition, since it is mixed outside the tube, even instant grout, which has a very short gelation time, is not subject to any restrictions unlike mixing inside the tube, and an excellent grout that can be used in any land conditions can be obtained.
さらに、注入管外での混合であるため、注入部内管４が
簡単であるため安価であり、また作動のトラブルがない
等、施工が容易である。Furthermore, since the mixing is performed outside the injection tube, the injection part inner tube 4 is simple and therefore inexpensive, and there are no operational troubles, making construction easy.
本発明に用いるグラウトの調合は、調合槽で調合するか
、あるいは注入管（内管）に入るまでの間（注入ポンプ
の前後から注入管にいたるまでのホース又はバイブ）で
合流する等の方法を用いることができる。The grout used in the present invention can be mixed in a mixing tank, or by combining the grout in a hose or vibrator from before and after the injection pump to the injection pipe before entering the injection pipe (inner pipe). can be used.
次に、本発明に用いるグラウト材について述べる。Next, the grout material used in the present invention will be described.
本発明のグラウトの主剤は水ガラスであり、緩結グラウ
トには水ガラスをアルカリ領域でゲル化させるアルカリ
系（グラウトのＰ Ｈはアルカリ性）と水ガラスを中性
−酸性領域でゲル化させる非アルカリ系（グラウトのＰ
Ｈは中性−酸性）とがあり、それぞれ従来からこの種の
硬化剤として使用していたものを用いることができる。The main ingredient of the grout of the present invention is water glass, and the slow-setting grout includes an alkaline system that gels water glass in an alkaline range (PH of the grout is alkaline) and a non-alkaline system that gels water glass in a neutral-acid range. Alkaline (grout P)
H is neutral to acidic), and those conventionally used as this type of curing agent can be used.
また、急結剤としては、緩結グラウトがアルカリ系の場
合には主として酸類（硫酸、リン酸酢酸等）や無機塩（
例えば塩化カリウム、硫酸ナトリウム、重炭酸ナトリウ
ム等） 酢酸エチルのようなエステル類、有機塩（例え
ば酢酸ソーダ等）を用いる。これらは単独または二種以
上を併用しても良い。In addition, when the slow setting grout is alkaline, the quick setting agent is mainly acids (sulfuric acid, phosphoric acid, acetic acid, etc.) and inorganic salts (
(e.g., potassium chloride, sodium sulfate, sodium bicarbonate, etc.), esters such as ethyl acetate, and organic salts (e.g., sodium acetate, etc.). These may be used alone or in combination of two or more.
また非アルカリ系の場合にはアルカリ性の物質（液のＰ
Ｈがアルカリ性）を用いて瞬結グラウトとする。In addition, in the case of non-alkaline substances, alkaline substances (liquid P
(H is alkaline) to make instant setting grout.
次に本発明の実施例について述べる。Next, examples of the present invention will be described.
実施例に用いたグラウトはアルカリ系で、その配合は１
ｍ″当り水ガラス（ＪＩＳＢ号）２５０β、炭酸プロピ
レン２０β、水７３０Ｉ２、ゲル化時間２７分（液温２
５℃）、グラウト（７） Ｐ Ｈ１１，Ｏ１’あった。The grout used in the example was alkaline and its composition was 1.
water glass (JISB No.) 250β, propylene carbonate 20β, water 730I2, gelation time 27 minutes (liquid temperature 2
5°C), grout (7) PH11,O1'.
また、急結剤の配合は、Ｉｍ”当りリン酸８０２水９２
０β（着色剤で着色）で、前記緩結グラウトと２二ｌの
比率（２が緩結グラウト）で混合したところ、ゲル化時
間は５秒の瞬結グラウト（ゲルのＰＨ９，５）が得られ
た。In addition, the composition of the quick-setting agent is 802 phosphoric acid and 92 parts water per Im''.
0β (colored with a coloring agent) and mixed with the above-mentioned slow-setting grout at a ratio of 22 liters (2 is slow-setting grout), an instant-setting grout (gel pH 9.5) with a gelation time of 5 seconds was obtained. It was done.
現場は東京部下の細砂層（Ｎ値２０）においてＧＬ−４
，０ｍ地点で本発明工法（第２図）の手順を実施した。The site is GL-4 in the fine sand layer (N value 20) below Tokyo.
, the procedure of the construction method of the present invention (Fig. 2) was carried out at the 0m point.
まず、緩結グラウトＡの吐出量毎分８Ｉ２、急結剤Ｂの
吐出量毎分８Ｉ２として瞬結グラウト２゜ｐを注入した
ところ、注入圧は３〜６．５ｋｇｆ／ｃｍ”であった。First, instant setting grout 2°p was injected with a discharge rate of 8I2/min for slow setting grout A and a discharge rate of 8I2/min for rapid setting agent B, and the injection pressure was 3 to 6.5 kgf/cm''.
次に、急結剤Ｂの圧送を中止し緩結グラウトを８０１２
注入したところ、注入圧４〜４．５ｋｇｆ／ｃ＋ｓ２で
あった。Next, stop pumping the quick setting agent B and apply the slow setting grout 8012.
When injected, the injection pressure was 4 to 4.5 kgf/c+s2.
さらに、注入管（二重管）を４０ｃｍ引き上げて前記注
入を４ステップ行ったが、施工は順調であり、グラウト
のリークは全くなかった。Furthermore, the injection pipe (double pipe) was pulled up by 40 cm and the injection was performed in four steps, but the construction went smoothly and there was no grout leakage at all.
また、注入圧は、各ステップともほとんど同じであった
。Moreover, the injection pressure was almost the same in each step.
注入後掘削してみたところ、注入管周囲に大きな隙間や
地盤の粗い部分に瞬結グラウトが充填されており、細か
い細砂層には縁結グラウトが十分に浸透固結しているこ
とが確認できた。When we excavated the area after injection, we found that large gaps around the injection pipe and rough areas of the ground were filled with flash-setting grout, and it was confirmed that the edge-setting grout had sufficiently penetrated and solidified into the fine sand layer. Ta.
また、注入圧は、各ステップともほとんど同じであった
６注入後、掘削してみたところ、注入管周囲に大きな隙
間や地盤の粗い部分に瞬結グラウトが充填されており、
細かい細砂層には緩結グラウトが十分に浸透固結してい
ることが確認できた。In addition, the injection pressure was almost the same in each step.After 6 injections, we excavated and found that large gaps around the injection pipe and rough areas of the ground were filled with flash-setting grout.
It was confirmed that the loosely set grout had sufficiently penetrated and solidified into the fine sand layer.
（比較例）
比較例は、第２図（ａ）の二重管先端装置を使用した以
外のグラウト並びに施゛工条件は実施例と全く同じであ
った。(Comparative Example) In the comparative example, the grout and the working conditions were exactly the same as in the example except that the double pipe tip device shown in FIG. 2(a) was used.
まず、瞬結グラウトを２０９注入したところ、注入圧は
初め３ ｋｇｆ／ｃｍ”程度であったが、最後には８〜
ｌＯｋｇｆ／ｃ＋＋”と比較的高い圧力となり、管内の
閉塞がうかがわれた。First, when 209% of flash setting grout was injected, the injection pressure was about 3 kgf/cm'' at first, but in the end it was 8~8 kgf/cm.
The pressure reached a relatively high level of 10 kgf/c++, indicating a blockage inside the tube.
さらに、引き続き緩結グラウトの注入を行ったが圧力は
７〜９ ｋｇｆ／ｃｍ”と高い値を示した。Furthermore, although slow setting grout was subsequently injected, the pressure showed a high value of 7 to 9 kgf/cm''.
次に、注入管を４０ｃ＋ｎ引き上げて瞬結グラウトを注
入したところ、圧力は３０ｋｇｆ／ｃｍ”以上に上昇し
たので中止した。Next, when the injection pipe was pulled up by 40c+n and instant setting grout was injected, the pressure rose to more than 30 kgf/cm'', so the injection was stopped.
このため、注入管を引き抜いて二重管の先端部を調べた
ところ、装置内の流路は瞬結グラウトで閉塞されていた
。For this reason, when the injection tube was pulled out and the tip of the double tube was examined, it was found that the flow path inside the device was blocked by flash-setting grout.
そして、二重管の先端部を整備して、再度注入管を設定
し注入したところ、同様な結果となった。Then, when the tip of the double tube was adjusted, the injection tube was set up again, and injection was performed, the same result was obtained.
すなわち、このような従来の方法では、ゲル化時間が極
端に短い瞬結グラウトの注入は不適であることが分かっ
た。That is, it has been found that such conventional methods are not suitable for injecting instant setting grout whose gelation time is extremely short.
第１図はこの発明に用いる注入管の先端装置を示す縦断
面図、第２図（ａ１〜（Ｃ１はこの発明の注入工程を示
す縦断面図、第３〜５図は従来の注入管の先端装置を示
す縦断面図である。
ｌ・・外管、２・・内管、２° ・・注入部内管、３・
・メタルクラウン、４・・注入孔、５・・吐出口部、６
・・外管流路、６° ・・内管流路、７・・空胴、Ａ・
・緩結グラウト、Ｂ・・急結剤。Fig. 1 is a longitudinal sectional view showing the tip device of the injection tube used in the present invention, Fig. 2 (A1 to C1 are longitudinal sectional views showing the injection process of the invention, and Figs. 3 to 5 are longitudinal sectional views showing the tip device of the injection tube used in the present invention). It is a vertical cross-sectional view showing the tip device. 1. Outer tube, 2. Inner tube, 2°. Injection part inner tube, 3.
・Metal crown, 4. Injection hole, 5. Discharge port, 6
・・Outer tube flow path, 6° ・・Inner tube flow path, 7・・Cavity, A・
- Slow setting grout, B... Rapid setting agent.
Claims (1)
の異なる二種のグラウトを交互に注入する複合注入工法
において、 Ａ）前記内管先端部に外管先端前方に突出する先端が閉
鎖された注入部内管をスライド自在に挿嵌し、前記注入
部内管壁面に注入孔を設け、外管の先端には吐出口を有
する先端装置を用い、Ｂ）地中に貫入した前記二重管を
所定長さ引き戻した後、その内管、外管のいずれかの流
路に緩結グラウト、外管の流路に急結剤を送液し、前記
内管に送液した液の液圧で前記注入部内管を前記二重管
の前方に生じた空胴に突出させ、この空胴内に吐出した
緩結グラウトと急結剤とを合流させて得られた瞬結グラ
ウトを注入管周囲や地盤の大きい間隙に注入し、 Ｃ）次に前記急結剤の合流を中止し、前記緩結グラウト
を地盤の小さい間隙に注入し、 Ｄ）前記注入管を連続的又はステップをきざむことによ
って引き上げながら瞬結グラウトと緩結グラウトを交互
かつ繰り返して注入することを特徴とした複合注入工法
。[Scope of Claims] 1) A composite injection method in which two types of grout, instant setting and slow setting, are alternately injected using a double pipe consisting of an inner pipe and an outer pipe, comprising: A) the tip of the inner pipe; An injection part inner tube with a closed tip protruding forward from the outer tube tip is slidably inserted into the injection part, an injection hole is provided on the wall surface of the injection part inner tube, and a tip device having a discharge port is used at the tip of the outer tube. , B) After pulling back the double pipe that has penetrated into the ground by a predetermined length, a slow setting grout is sent to the flow path of either the inner pipe or the outer pipe, and an quick setting agent is sent to the flow path of the outer pipe. , the injection part inner tube is made to protrude into the cavity formed in front of the double tube by the hydraulic pressure of the liquid sent to the inner tube, and the slow-setting grout discharged into this cavity is joined with the quick-setting agent. Inject the resulting instant setting grout into large gaps around the injection pipe and in the ground; C) Next, stop the merging of the quick setting agent and inject the slow setting grout into small gaps in the ground; D) A composite injection method characterized in that instant setting grout and loose setting grout are alternately and repeatedly injected while the injection pipe is pulled up continuously or in steps.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266746A JPH02112517A (en) | 1988-10-21 | 1988-10-21 | Composite grouting technique using dual pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63266746A JPH02112517A (en) | 1988-10-21 | 1988-10-21 | Composite grouting technique using dual pipe |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02112517A true JPH02112517A (en) | 1990-04-25 |
Family
ID=17435133
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63266746A Pending JPH02112517A (en) | 1988-10-21 | 1988-10-21 | Composite grouting technique using dual pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02112517A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0688330A (en) * | 1992-06-29 | 1994-03-29 | Kyokado Eng Co Ltd | Ground injection chemical |
| JP2019099984A (en) * | 2017-11-30 | 2019-06-24 | パナソニックＩｐマネジメント株式会社 | Heat insulation sheet and manufacturing method therefor, and electronic device and battery unit |
| CN111472346A (en) * | 2020-04-30 | 2020-07-31 | 中国二十二冶集团有限公司 | Construction method for reinforcing soil around pile body of cast-in-place pile |
| CN114250976A (en) * | 2022-01-19 | 2022-03-29 | 江苏方建质量鉴定检测有限公司 | Nondestructive slurry supplementing construction method for realizing slurry return at cavity bottom by using double-cavity compensator |
-
1988
- 1988-10-21 JP JP63266746A patent/JPH02112517A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0688330A (en) * | 1992-06-29 | 1994-03-29 | Kyokado Eng Co Ltd | Ground injection chemical |
| JP2019099984A (en) * | 2017-11-30 | 2019-06-24 | パナソニックＩｐマネジメント株式会社 | Heat insulation sheet and manufacturing method therefor, and electronic device and battery unit |
| CN111472346A (en) * | 2020-04-30 | 2020-07-31 | 中国二十二冶集团有限公司 | Construction method for reinforcing soil around pile body of cast-in-place pile |
| CN114250976A (en) * | 2022-01-19 | 2022-03-29 | 江苏方建质量鉴定检测有限公司 | Nondestructive slurry supplementing construction method for realizing slurry return at cavity bottom by using double-cavity compensator |
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