JPH0637767B2 - Ground improvement method combining agitation blades and high-pressure injection - Google Patents
Ground improvement method combining agitation blades and high-pressure injectionInfo
- Publication number
- JPH0637767B2 JPH0637767B2 JP63074077A JP7407788A JPH0637767B2 JP H0637767 B2 JPH0637767 B2 JP H0637767B2 JP 63074077 A JP63074077 A JP 63074077A JP 7407788 A JP7407788 A JP 7407788A JP H0637767 B2 JPH0637767 B2 JP H0637767B2
- Authority
- JP
- Japan
- Prior art keywords
- rod
- pressure
- ground
- discharge port
- rotating
- 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 - Lifetime
Links
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- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【発明の詳細な説明】 [産業上の利用分野] 本発明は土木、建築工事における地盤改良のための攪拌
翼と高圧噴射併用地盤改良工法に関するものである。TECHNICAL FIELD The present invention relates to a ground improvement method using a stirring blade and high-pressure injection for ground improvement in civil engineering and construction work.
[従来の技術] 従来、地盤改良のため攪拌翼により地盤の土壌と固化材
とを混合、攪拌して固化し、改良柱を形成する工法の一
例としては、第7図に示す如く中空のロッド1の先端付
近に1段の掘削翼2とその上方に3段(1〜5段が適宜
使用される)の攪拌翼3を固着し、ロッド1の先端付近
に吐出口4a及び最上段の攪拌翼付近のロッド1に吐出
口4bを設けた地盤改良装置を使用する工法が用いられ
ている。このロッド1の吐出口4a,4bはロッド内を
通じて地上の固化材注入ポンプと連結され、施工中前記
吐出口4a,4bの内不必要な片方の吐出口はプラグで
盲される。ロッド1は図示しない地上の施工機構で回転
・給進されるようになっている。前記第7図に示すよう
な地盤改良装置を用いて施工するには固化材を吐出口
4a、4bから地盤にてん充せずに、ロッド1を回転せ
しめつつ給進して掘削し、所定の深度まで掘削したら、
ロッド1を回転しつつ地上のポンプから圧送した固化材
を吐出口4bから吐出しながらロッド1を引き上げるこ
とにより、固化材を地盤の土壌に注入・攪拌・混合する
工法、固化材を吐出口4aから地盤にてん充しつつ、
ロッド1を回転させながらロッド1を給進し、所定の深
度まで掘削し攪拌・混合したら固化材のてん充をやめ、
ロッド1を回転しつつロッド1を引き上げることにより
固化材を地盤の土壌と攪拌・混合する工法、固化材を
吐出口4aから地盤にてん充しつつ、ロッド1を回転さ
せながらロッド1を給進し、所定の深度まで掘削し攪拌
・混合したら、更に固化材を吐出口4bから地盤にてん
充しつつ、ロッド1を回転させながらロッド1を引き上
げることにより固化材を地盤の土壌と攪拌・混合し、改
良柱10aを施工する工法がある。[Prior Art] Conventionally, as an example of a method of mixing the soil of the ground and the solidifying material with a stirring blade for solidifying the ground, stirring and solidifying, and forming an improved column, a hollow rod as shown in FIG. 7 is used. 1 stage of excavating blade 2 and 3 stages of stirring blades 3 (1 to 5 stages are appropriately used) are fixed above the tip, and discharge port 4a near the tip of rod 1 and uppermost stage stirring A construction method using a ground improvement device in which a discharge port 4b is provided in the rod 1 near the wing is used. The discharge ports 4a and 4b of the rod 1 are connected to a solidified material injection pump on the ground through the rod, and one unnecessary discharge port of the discharge ports 4a and 4b is blinded by a plug during construction. The rod 1 is rotated and fed by an unillustrated construction mechanism on the ground. In order to perform construction using the ground improvement device as shown in FIG. 7, the solidified material is not filled from the discharge ports 4a and 4b in the ground, and the rod 1 is rotated while being fed and excavated, After drilling to the depth,
A method of injecting, stirring, and mixing the solidified material into the soil of the ground by discharging the solidified material pumped from a pump on the ground while rotating the rod 1 and discharging the solidified material from the discharge opening 4b. While filling up from the ground,
Feed the rod 1 while rotating the rod 1, excavate to a predetermined depth, and after stirring and mixing, stop filling the solidified material,
The method of stirring and mixing the solidified material with the soil of the ground by pulling up the rod 1 while rotating the rod 1, while filling the solidified material in the ground from the discharge port 4a, the rod 1 is advanced while rotating the rod 1. Then, after excavating to a predetermined depth and stirring / mixing, the solidifying material is further stirred from the discharge port 4b in the ground, and the rod 1 is pulled up while rotating the rod 1 to mix / solidify the solidifying material with the soil in the ground. However, there is a construction method for constructing the improved pillar 10a.
また、他の例としては第8図に示すような中空のロッド
5の下端に高圧吐出口6を設けた地盤改良装置を用いる
工法で、ロッド5を回転せしめつつ、前記高圧吐出口6
から50kg/cm2〜300kg/cm2の高圧で固化材を高圧噴
射6aしつつ前記ロッドを給進し、その高圧噴流によっ
て地盤の土壌と固化材を攪拌・混合し、改良柱10aを
施工する工法、さらに第9図に示すようなロッド7の下
端に設ける高圧吐出口8aをパイプ8により所定の半径
まで延長した地盤改良装置を用いる工法で、前記高圧吐
出口8aから50kg/cm2〜300kg/cm2の高圧で固化材
を高圧噴射8aしつつロッド7を給進し、断面ドーナツ
状の柱状に土壌と固化材を攪拌・混合し、改良柱10b
を施工する工法がある。As another example, a construction method using a ground improvement device in which a high-pressure discharge port 6 is provided at the lower end of a hollow rod 5 as shown in FIG. 8 is used while rotating the rod 5 while the high-pressure discharge port 6 is being rotated.
To 50 kg / cm 2 to 300 kg / cm 2 at a high pressure, the rod is advanced while high-pressure jetting 6a of the solidifying material, and the high-pressure jet stirs and mixes the soil in the ground with the solidifying material to construct the improved pillar 10a. The construction method is a construction method using a ground improvement device in which a high pressure discharge port 8a provided at the lower end of the rod 7 as shown in FIG. 9 is extended to a predetermined radius by a pipe 8, and 50 kg / cm 2 to 300 kg from the high pressure discharge port 8a. The solidified material is injected at high pressure 8a at a high pressure of / cm 2 and the rod 7 is advanced to stir and mix the soil and the solidified material in a donut-shaped cross-section.
There is a construction method to construct.
前記固化材としては液状のセメント系固化材または水ガ
ラス等が使用される。A liquid cement-based solidifying material, water glass, or the like is used as the solidifying material.
[発明が解決しようとする課題] しかしながら、第7図に示す低圧吐出口4a、4bから
の低圧の固化材をてん充しつつ掘削・攪拌する装置及び
その工法又は第8図に示す装置及びその工法によれば、
第12図に示すように改良柱10a(土壌と固化材が攪
拌・混合された後固化した柱状のもの)のそれぞれを互
いに外接させて施工した場合は未改良部分11が大き
く、さらに第11図に示すように土壌固化柱10aそれ
ぞれを実用の範囲で互いにラップさせて施工した場合も
未改良部分11は残る。従って、第10図に示すような
場合、未改良部分11をなくしようとすると施工ピッチ
が小さくなり実用的でなくなると共に、工事費が高くな
り能率低下はさけられなかった。従って、未改良部分1
1をなくし、改良地盤の下方からの水が未改良部分11
を通って上昇することを防止することは困難であった。[Problems to be Solved by the Invention] However, a device for excavating and stirring while filling a low-pressure solidifying material from the low-pressure discharge ports 4a, 4b shown in FIG. 7 and its construction method, or a device shown in FIG. According to the construction method,
As shown in FIG. 12, when each of the improved columns 10a (columns solidified after the soil and the solidifying material are stirred and mixed and solidified) is circumscribed to each other, the unmodified portion 11 is large, and FIG. As shown in FIG. 5, the unimproved portion 11 remains even when the soil-solidified columns 10a are lapped with each other in a practical range. Therefore, in the case as shown in FIG. 10, if the unimproved portion 11 is to be eliminated, the construction pitch becomes small and not practical, and the construction cost becomes high and the efficiency is unavoidable. Therefore, unmodified part 1
1 and the water from the bottom of the improved ground is unmodified 11
It was difficult to prevent climbing through.
また、第9図に示すような装置による工法は中央に未改
良部分11が残り、また、ドーナツ状に固化材を土壌に
てん充するので固化材の混入割合が不均一であり、強度
がでない等の欠点があった。Further, in the construction method using the device as shown in FIG. 9, the unmodified portion 11 remains in the center, and since the solidifying material is filled with the soil in a donut shape, the mixing ratio of the solidifying material is uneven and the strength is not good. There were drawbacks such as.
また、第7図に示すような地盤改良装置による工法を第
11図に示すように、鋼矢板、コンクリート壁等の地中
の構造物内側に適用すると、改良柱10aは掘削翼2及
び攪拌翼3の回転する先端が鋼矢板12に接触しない状
態で施工しなければならないので、前記鋼矢板12と改
良柱10aの列との間に未改良部分11が残り、鋼矢板
12と改良柱10aは密着せず未改良部分11から湧き
出す水を止めることはできない。また第8図及び第9図
に示す地盤改良装置を用いると、鋼矢板12と改良柱1
0aとの密着が可能であるが、改良柱10aは工法原理
上固化材と土壌の混合・攪拌が均一でないので強度が低
く、そのため工事費が割高となる欠点があった。Further, when the construction method by the ground improvement device as shown in FIG. 7 is applied to the inside of the underground structure such as steel sheet pile, concrete wall, etc. as shown in FIG. 11, the improved pillar 10a becomes the excavation blade 2 and the stirring blade. Since the rotating tip of 3 must be installed in a state where it does not come into contact with the steel sheet pile 12, the unmodified portion 11 remains between the steel sheet pile 12 and the row of the improved columns 10a, and the steel sheet pile 12 and the improved columns 10a are It is not possible to stop the water spouting from the unmodified portion 11 without the close contact. When the ground improvement device shown in FIG. 8 and FIG. 9 is used, the steel sheet pile 12 and the improved pillar 1
However, the improved pillar 10a has a drawback that the strength and strength of the improved pillar 10a are low because mixing and stirring of the solidifying material and the soil are not uniform due to the principle of the construction method, resulting in a high construction cost.
本発明は上述した事情に鑑みてなされたものであり、中
心部を攪拌翼による攪拌により均一で強度のある柱と
し、外側部を高圧噴射による混合・攪拌により、地中の
構造物に接触させ、止水能力のあるドーナツ状の柱で取
り捲いた改良柱として施工できる、攪拌翼と高圧噴射併
用地盤改良工法を提供するものである。The present invention has been made in view of the above-mentioned circumstances, in which the central portion is made into a column having a uniform and strong strength by stirring with a stirring blade, and the outer portion is brought into contact with an underground structure by mixing and stirring by high-pressure injection. Provided is a ground improvement method using a combination of a stirring blade and high-pressure jet, which can be constructed as an improved pillar surrounded by a donut-shaped pillar having a water stopping ability.
[課題を解決するための手段] 前記課題を解決するための手段は、下記第1〜第2の請
求項よりなる。[Means for Solving the Problems] Means for solving the above problems include the following first and second claims.
(1)次の各工程の結合から成る、攪拌翼と高圧噴射併用
地盤改良工法。(1) A ground improvement method using a combination of agitation blades and high-pressure injection, which consists of combining the following steps.
先端付近に1段の掘削翼とその上方に少なくとも1
段の攪拌翼を有するロッドを回転させながらロッド下端
付近に設けた低圧吐出口からポンプ吐出側における圧力
が1kg/cm2〜15kg/cm2の固化大を吐出しつつ地盤の下
方へ所定深度までロッドを給進する工程、 前記ロッドを回転させながら、低圧吐出口から固化
材を吐出せずに、掘削翼先端付近の高圧吐出口からポン
プ吐出側における圧力が50kg/cm2〜300kg/cm2の固
化材を噴射しつつ前記ロッドを引き上げる工程、 (2)次の各工程の結合から成る、攪拌翼と高圧噴射併用
地盤改良工法。One-stage drilling blade near the tip and at least one above it
While ejecting solidified sized pressure 1kg / cm 2 ~15kg / cm 2 while rotating the low-pressure discharge port provided in the vicinity of the rod lower end of the pump discharge side a rod having a stepped stirring blade downward of the ground to a predetermined depth The step of feeding the rod, while rotating the rod, without discharging the solidified material from the low pressure discharge port, the pressure on the discharge side of the pump from the high pressure discharge port near the tip of the excavation blade is 50 kg / cm 2 to 300 kg / cm 2 (2) A ground improvement method using a stirring blade and high-pressure injection, which comprises the step of pulling up the rod while injecting the solidifying material, and (2) combining the following steps.
先端付近に1段の掘削翼とその上方に少なくとも1
段の攪拌翼を有するロッドを回転させながらロッド下端
付近に設けた低圧吐出口からポンプ吐出側における圧力
が1kg/cm2〜15kg/cm2の固化材いを吐出しつつ地盤の
下方へ所定深度までロッドを給進する工程、 前記ロッドを回転させながら少なくとも最下段の掘
削翼先端付近の高圧吐出口からポンプ吐出側における圧
力が50kg/cm2〜300kg/cm2の固化材を噴射しつつ前
記ロッドを所定深度まで引き上げる工程、 さらに、ロッドを回転させながら前記高圧吐出口か
ら、ポンプ吐出側における圧力が50kg/cm2〜300kg
/cm2の固化材を噴射しつつ地盤の下方へ所定深度まで前
記ロッドを給進する工程、 固化材を全く吐出せずに前記ロッドを回転させなが
ら攪拌して引き上げる工程。One-stage drilling blade near the tip and at least one above it
Predetermined depth below the ground while ejecting solidified material have a pressure of 1kg / cm 2 ~15kg / cm 2 in the pump discharge side from the low pressure discharge port provided in the vicinity of the rod lower end while rotating the rod with a stage stirring blades to KyuSusumu rod until step, the while the pressure at the pump discharge side from the high pressure discharge port in the vicinity of the drilling blade tip of at least the bottom while rotating the rod to inject the solidifying material of 50kg / cm 2 ~300kg / cm 2 The step of pulling up the rod to a predetermined depth, further, while rotating the rod, the pressure on the discharge side of the pump from the high pressure discharge port is 50 kg / cm 2 to 300 kg.
A step of injecting the solidifying material of / cm 2 and advancing the rod to a predetermined depth below the ground, a step of stirring and pulling up while rotating the rod without discharging the solidifying material at all.
[作 用] 改良柱の中心部は攪拌翼の回転による攪拌により土壌と
固化材の混合が均一に良く行われるので強度が高い。そ
の外側部は固化材を高圧噴射することによって得られる
高圧噴流により土壌と固化材とが攪拌されるので、中心
部に比べ若干混合状態が悪く強度は幾分低くなるが、地
中の鋼天板、構造物等に対する機械的接触がないので未
改良部分がないように接近して施工ができると共に、中
心部と合わせて大径の改良柱が施工可能である。[Operation] The strength of the central part of the improved column is high because the soil and solidifying material are mixed uniformly and well by stirring by rotating the stirring blade. The soil and the solidified material are agitated on the outer side by a high-pressure jet obtained by high-pressure injection of the solidified material, so the mixed state is a little worse and the strength is somewhat lower than in the central part. Since there is no mechanical contact with the plate, structure, etc., it is possible to work closely without any unmodified parts, and it is also possible to build large-diameter improved columns together with the central part.
[実施例] 以下、添付図に基づいて本発明の一実施例を詳細に説明
する。[Embodiment] An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.
第1図(a)〜(d)、及び第2図(a)〜(h)は、
それぞれ第1の請求項及び第2の請求項である攪拌翼と
高圧噴射併用地盤改良工法の施工順序を示す工法図であ
る。1 (a) to (d) and 2 (a) to (h),
It is a construction drawing which shows the construction order of the ground improvement construction method with a stirring blade and a high pressure injection which are the 1st claim and the 2nd claim, respectively.
この工法に使用する地盤改良装置は、第3図(a)に示
すように二重管ロッド21の先端付近に掘削翼22が固
着され、その上方に3段(1段以上で、土質及び施工条
件に応じ適宜変更される)の攪拌翼23,23,23が
配設されてロッド21に固着されている。In the ground improvement device used for this construction method, as shown in FIG. 3 (a), an excavation blade 22 is fixed near the tip of a double pipe rod 21, and there are three stages (one or more stages depending on soil quality and construction). The stirring blades 23, 23, 23 (which are appropriately changed according to the conditions) are provided and fixed to the rod 21.
なお、出願人が権利を有する特許第1197295号及
び第1197296号の共廻り防止装置を装着すると攪
拌翼23の攪拌効果が一層向上する。第3図(b)は前
記共廻り防止装置の一例である共廻り防止翼28を装着
した正面図で、この共廻り防止翼28は掘削翼22及び
攪拌翼23より大径で、かつロッド21に対し回転自在
となっているので、ロッド21を給進・引き上げして掘
削・攪拌する際に、掘削翼22及び攪拌翼23は回転す
るが共廻り防止翼28は掘削孔外周の掘削されない地盤
に食い込んで回転しないので、掘削翼で固化材と混合・
攪拌されて動く土壌がこの回転しない共廻り防止翼28
に当り、混合・攪拌が良く行われる。If the co-rotation preventing devices of the patents No. 1197295 and No. 1197296, which the applicant holds, are installed, the stirring effect of the stirring blades 23 is further improved. FIG. 3B is a front view in which a co-rotation preventing blade 28, which is an example of the co-rotation preventing apparatus, is mounted. The co-rotation preventing blade 28 has a diameter larger than that of the excavating blade 22 and the stirring blade 23 and the rod 21. Since it is rotatable, the excavation blade 22 and the agitation blade 23 rotate while the rod 21 is advanced / pulled up and excavated / stirred, but the co-rotation prevention blade 28 does not excavate the ground on the outer periphery of the excavation hole. Since it does not rotate by biting into the
The non-rotating co-rotation wing 28 where the soil that is stirred and moves does not rotate
At this time, mixing and stirring are often performed.
第3図(a)に示すように、前記ロッド21の先端付近
には低圧吐出口24が穿設されると共に、前記掘削翼2
2の先端には高圧吐出口25が開口している。図示しな
いが、高圧吐出口25は掘削翼22の先端と付根の間に
先端方向に吐出口を向けて設けてもよい。前記低圧吐出
口24及び高圧吐出口25はそれぞれ二重管の外管と内
管との隙間及び内管と連通しており、前記二重管の上端
は地上の低圧ポンプ及び高圧ポンプに連結され、前記二
重管は図示しない地上の施工機械で回転・給進されるよ
うになっている。As shown in FIG. 3 (a), a low pressure discharge port 24 is formed near the tip of the rod 21, and the excavation blade 2
A high-pressure discharge port 25 is opened at the tip of 2. Although not shown, the high-pressure discharge port 25 may be provided between the tip and the root of the excavation blade 22 with the discharge port facing the tip direction. The low-pressure discharge port 24 and the high-pressure discharge port 25 are in communication with the gap between the outer pipe and the inner pipe of the double pipe and the inner pipe, and the upper end of the double pipe is connected to the low-pressure pump and the high-pressure pump on the ground. The double pipe is rotated and fed by an unillustrated construction machine on the ground.
本発明の工法は第1の請求項及び第2の請求項からなっ
ており、以下に順次その工法を説明する。The construction method of the present invention comprises the first claim and the second claim, and the construction method will be described below in order.
第1の請求項の工法を第1図(a)〜第1図(d)に示
す。先ず、第1図(a)のようにロッド21を回転させ
ながら低圧吐出口24から低圧(ポンプ吐出側における
圧力で1kg/cm2〜15kg/cm2)の固化材を吐出しつつ地
盤中に給進させ、第1図(b)に示すように地盤の下方
所定深度までロッドを給進して掘削と同時に固化材と土
壌を攪拌・混合して中心改良柱26aを施工する。次に
低圧吐出口24からの固化材の吐出を中止し、第1図
(c)に示すように掘削翼先端の高圧吐出口25から高
圧(ポンプ吐出口側における圧力で50kg/cm2〜300
kg/cm2)の固化材を高圧噴射25aしつつロッドを回転
しながら引き上げて外側改良柱26bを第1図(d)に
示すように施工して完了する。The construction method of the first claim is shown in FIGS. 1 (a) to 1 (d). First, in the ground while ejecting solidified material of the low pressure from the low pressure discharge port 24 while rotating the rod 21 (1 kg with a pressure at the pump discharge side / cm 2 ~15kg / cm 2) as in FIG. 1 (a) As shown in FIG. 1 (b), the rod is advanced to a predetermined depth below the ground to excavate and simultaneously mix and mix the solidifying material and the soil to construct the central improvement column 26a. Then, the discharge of the solidified material from the low-pressure discharge port 24 is stopped, and as shown in FIG. 1 (c), the high-pressure discharge port 25 at the tip of the excavation blade is pressurized to a high pressure (pressure at the pump discharge port side is 50 kg / cm 2 to 300).
kg / cm 2 ) of the solidified material is injected under high pressure 25a while pulling up while rotating the rod, and the outer improvement column 26b is constructed as shown in FIG.
第1図(e)に第1図(d)のA−A線断面図を示す
が、通信改良柱26aは5〜30kg/cm2、外側改良柱2
6bは2〜10kg/cm2の強度となる。FIG. 1 (e) is a sectional view taken along the line AA of FIG. 1 (d). The communication improving column 26a is 5 to 30 kg / cm 2 , and the outer improving column 2 is
6b has a strength of 2 to 10 kg / cm 2 .
第2の請求項の工法を第2図(a)〜第2図(h)に示
す。第2図(a)〜第2図(d)までの工程は第1図
(a)〜第1図(d)と同じであるが、次に第2図
(e)及び第2図(f)に示すように、再び掘削翼先端
付近の高圧吐出口から高圧の固化材を再度噴射しつつ、
前記所定の深度までロッドを回転しながら給進し、
(c)の工程で築造された外側改良柱26bを通して高
圧噴流液が注入されるので外側改良柱26bの外径が拡
大され、次に第2図(g)及び第2図(h)に示すよう
に固化材を出さずにロッド21を回転させながら引き上
げる。The construction method of the second claim is shown in FIGS. 2 (a) to 2 (h). The steps of FIGS. 2 (a) to 2 (d) are the same as those of FIGS. 1 (a) to 1 (d), but next, FIGS. 2 (e) and 2 (f). ), While again injecting the high-pressure solidifying material from the high-pressure discharge port near the tip of the excavation blade,
Feed while rotating the rod to the predetermined depth,
Since the high-pressure jet liquid is injected through the outer improving column 26b constructed in the step (c), the outer diameter of the outer improving column 26b is enlarged, and then shown in FIGS. 2 (g) and 2 (h). As described above, the rod 21 is pulled up without rotating the solidified material.
即ち、再び掘削翼先端付近の高圧吐出口から高圧の固化
材を高圧噴射すると、噴射圧は(c)工程と同じであっ
ても、(c)工程で築造された外側改良柱26bを貫通
して削孔壁に高圧噴流液が到達して(c)工程より少し
ではあるが孔径を拡大するので、外側改良柱26bの外
径がその分拡大することになる。That is, when the high-pressure solidified material is injected again from the high-pressure discharge port near the tip of the excavation blade, even though the injection pressure is the same as that in the step (c), it penetrates the outer improvement column 26b built in the step (c). Since the high-pressure jet liquid reaches the hole-drilling wall and the hole diameter is expanded, although slightly, as compared with the step (c), the outer diameter of the outer improvement column 26b is increased accordingly.
第4図は本発明の工法による改良柱を未改良部分なくラ
ップさせた図で外側改良柱26bをラップさせた図で外
側改良柱26bをラップさせるので未改良部分が全くな
い。また、第6図は未改良部分11を残し、外側改良柱
26bを互いに少しずつラップさせた図である。FIG. 4 is a view in which the improved columns according to the method of the present invention are wrapped without any unmodified portions, and a diagram in which the outer modified columns 26b are wrapped is shown in which the outer modified columns 26b are wrapped, so that there are no unmodified portions. Further, FIG. 6 is a view in which the unmodified portion 11 is left and the outer modified columns 26b are gradually wrapped with each other.
第5図は本発明の工法による改良柱26の外側改良柱2
6bを鋼矢板12内側でラップさせて未改良部分11を
全くなくし、止水効果を高めたものである。FIG. 5 shows the outer side improved pillar 2 of the improved pillar 26 by the construction method of the present invention.
6b is wrapped inside the steel sheet pile 12 to eliminate the unmodified portion 11 at all and enhance the water blocking effect.
[発明の効果] 以上詳細に説明した本発明の攪拌翼と高圧噴射併用工法
によれば次のような効果を奏する。[Effects of the Invention] According to the method for combined use of the stirring blade and the high-pressure injection of the present invention described in detail above, the following effects are exhibited.
改良柱間の地盤改良できない部分がなくなり、止水
が完全な地盤改良が可能である。There is no part of the ground that cannot be improved between the improved columns, and it is possible to improve the ground completely by stopping water.
鋼矢板、コンクリート壁等の地中の構造物内側に本
発明の工法を適用すると、外側改良柱は固化材の高圧噴
射による施工であるから、攪拌翼等が構造物に当ること
がないので、構造物と改良柱との間に未改良部分が残ら
ず、構造物に改良柱がラップして密着するので止水が完
全である。When applying the method of the present invention to the inside of underground structures such as steel sheet piles and concrete walls, since the outer improved columns are constructions by high-pressure injection of the solidifying material, the stirring blades and the like do not hit the structure, There is no unimproved portion between the structure and the improved column, and the improved column wraps and adheres closely to the structure, so that waterproofing is complete.
従来の大径の掘削翼と攪拌翼による改良柱の施工に
比べ、これと同じ外径の本発明の改良柱の施工は、外側
改良柱が高圧の固化材の噴射による攪拌・混合によるも
のであるから馬力が小さくてすむ。Compared to the conventional construction of improved columns with large-diameter excavation blades and agitation blades, the construction of improved columns of the present invention having the same outer diameter is due to stirring and mixing by the outer improved columns by injection of high-pressure solidifying material. Because there is, horsepower is small.
地盤改良工法では一般に高圧噴射によって築造され
た地盤改良体(改良柱)は品質が悪く、また強度発現が
低いとともに高価であるが、低圧注入された固化材を攪
拌翼により混練する工法は、高品質であり廉価である。
この点本願発明は、高圧と低圧をミックスさせることに
よって、強度(品質)と経済性の調和をとりつつ未改良
部分がないように改良柱を互にラップさせて形成でき
る。In the ground improvement method, generally, the ground improvement body (improved column) constructed by high-pressure injection is poor in quality, low in strength development, and expensive, but the method of kneading the solidified material injected at low pressure with the stirring blade is high. Quality and low price.
In this respect, according to the present invention, by mixing high pressure and low pressure, the improved columns can be formed by wrapping each other so that there is no unimproved portion while keeping the strength (quality) and the economical efficiency in harmony.
【図面の簡単な説明】 第1図(a)〜(d)は第1の請求項の施工順序を示す
工法図、第1図は(e)は第1図(d)のA−A線断面
図、第2図(a)〜(h)は第2の請求項の施工順序を
示す工法図、第3図(a)は本工法に使用する攪拌翼と
高圧噴射併用地盤改良装置の正面図、第3図(b)は本
発明に使用する攪拌翼と高圧噴射併用地盤改良装置に共
廻り防止装置を取り付けた正面図、第4図は本発明の工
法による改良柱を未改良部分なくラップさせて施工した
平面図、第5図は本発明の工法による改良柱の外側改良
柱を鋼矢板内側にラップさせて施工した平面図、第6図
は未改良部分を残し外側改良柱を一部ラップさせた平面
図、第7図は従来の攪拌翼による地盤改良装置とその施
工状態の一例を示す正面図、第8図は従来の固化材の高
圧噴射による地盤改良装置とその施工状態の一例を示す
正面図、第9図は従来の固化材の高圧噴射による地盤改
良装置とその施工状態の他の例を示す正面図、第10図
は従来の工法による改良柱をラップさせて施工した平面
図、第11図は従来の工法による改良柱を鋼矢板内側に
近接して施工した平面図、第12図は従来の工法による
改良柱を互いに外接させて施工した平面図である。 1,5,7,21……ロッド、 2,22……掘削翼、3,23……攪拌翼、 4,24……低圧吐出口、 6,8a,25……高圧吐出口、 10a,10b,26……改良柱、 26a……中心改良柱、26b……外側改良柱。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 (a) to (d) are construction method diagrams showing the construction order of the first claim, and FIG. 1 (e) is a line AA of FIG. 1 (d). Sectional views, FIGS. 2 (a) to 2 (h) are construction drawings showing the construction order of the second claim, and FIG. 3 (a) is a front view of a stirring blade used in this construction method and a high-pressure jet combined ground improvement device. Fig. 3 (b) is a front view in which a co-rotation preventive device is attached to a ground improvement device using agitation blades and high-pressure injection used in the present invention, and Fig. 4 shows an improved pillar by the construction method of the present invention without unimproved parts. Fig. 5 is a plan view constructed by wrapping, and Fig. 5 is a plan view constructed by wrapping the outer improved columns of the improved columns by the method of the present invention inside the steel sheet pile, and Fig. 6 shows the outer improved columns with the unmodified portion left. FIG. 7 is a plan view showing a partially lapped portion, FIG. 7 is a front view showing an example of a ground improvement device using a conventional stirring blade and its construction state, and FIG. 8 is a conventional solidifying material. 9 is a front view showing an example of the ground improvement apparatus by high-pressure injection and its construction state, FIG. 9 is a front view showing another example of the conventional soil improvement apparatus by high-pressure injection of solidifying material, and its execution state, FIG. 10 is Fig. 11 is a plan view of the improved pillars constructed by the conventional construction method, and Fig. 11 is a plan view of the modified pillars constructed by the conventional construction method in the vicinity of the inside of the steel sheet pile. It is a top view constructed by circumscribing. 1, 5, 7, 21 ... Rod, 2, 22 ... Excavation blade, 3, 23 ... Stirring blade, 4, 24 ... Low pressure outlet, 6, 8a, 25 ... High pressure outlet, 10a, 10b , 26 …… Improvement pillar, 26a …… Center improvement pillar, 26b …… Outside improvement pillar.
Claims (2)
噴射併用地盤改良工法。 先端付近に1段の掘削翼とその上方に少なくとも1
段の攪拌翼を有するロッドを回転させながらロッド下端
付近に設けた低圧吐出口からポンプ吐出側における圧力
が1kg/cm2〜15kg/cm2の固化材を吐出しつつ地盤の下
方へ所定深度までロッドを給進する工程、 前記ロッドを回転させながら、低圧吐出口から固化
材を吐出せずに、掘削翼先端付近の高圧吐出口からポン
プ吐出側における圧力が50kg/cm2〜300kg/cm2の固
化材を噴射しつつ前記ロッドを引き上げる工程、1. A ground improvement method using a combination of a stirring blade and high-pressure injection, which comprises a combination of the following steps. One-stage drilling blade near the tip and at least one above it
While the pressure at the pump discharge side from the low pressure discharge port provided in the vicinity of the rod lower end while rotating the rod with a stage stirring blade ejects consolidated material of 1kg / cm 2 ~15kg / cm 2 below the ground to a predetermined depth The step of feeding the rod, while rotating the rod, without discharging the solidified material from the low pressure discharge port, the pressure on the discharge side of the pump from the high pressure discharge port near the tip of the excavation blade is 50 kg / cm 2 to 300 kg / cm 2 The step of pulling up the rod while injecting the solidifying material of
噴射併用地盤改良工法。 先端付近に1段の掘削翼とその上方に少なくとも1
段の攪拌翼を有するロッドを回転させながらロッド下端
付近に設けた低圧吐出口からポンプ吐出側における圧力
が1kg/cm2〜15kg/cm2の固化材を吐出しつつ地盤の下
方へ所定深度までロッドを給進する工程、 前記ロッドを回転させながら少なくとも最下段の掘
削翼先端付近の高圧吐出口からポンプ吐出側における圧
力が50kg/cm2〜300kg/cm2の固化材を噴射しつつ前
記ロッドを所定深度まで引き上げる工程、 さらに、ロッドを回転させながら前記高圧吐出口か
ら、ポンプ吐出側における圧力が50kg/cm2〜300kg
/cm2の固化材を噴射しつつ地盤の下方へ所定深度まで前
記ロッドを給進する工程、 固化材を全く吐出せずに前記ロッドを回転させなが
ら攪拌して引き上げる工程。2. A ground improvement method using a combination of a stirring blade and high-pressure jet, which comprises a combination of the following steps. One-stage drilling blade near the tip and at least one above it
While the pressure at the pump discharge side from the low pressure discharge port provided in the vicinity of the rod lower end while rotating the rod with a stage stirring blade ejects consolidated material of 1kg / cm 2 ~15kg / cm 2 below the ground to a predetermined depth a step of KyuSusumu the rod, the pressure at the pump discharge side from the high pressure discharge port in the vicinity of the drilling blade tip of at least the bottom while rotating the rod while injecting the solidifying material of 50kg / cm 2 ~300kg / cm 2 rod The pressure on the pump discharge side from the high-pressure discharge port while rotating the rod is 50 kg / cm 2 to 300 kg.
A step of injecting the solidifying material of / cm 2 and advancing the rod to a predetermined depth below the ground, a step of stirring and pulling up while rotating the rod without discharging the solidifying material at all.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074077A JPH0637767B2 (en) | 1988-03-28 | 1988-03-28 | Ground improvement method combining agitation blades and high-pressure injection |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63074077A JPH0637767B2 (en) | 1988-03-28 | 1988-03-28 | Ground improvement method combining agitation blades and high-pressure injection |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH01247611A JPH01247611A (en) | 1989-10-03 |
JPH0637767B2 true JPH0637767B2 (en) | 1994-05-18 |
Family
ID=13536746
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63074077A Expired - Lifetime JPH0637767B2 (en) | 1988-03-28 | 1988-03-28 | Ground improvement method combining agitation blades and high-pressure injection |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0637767B2 (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0730551B2 (en) * | 1992-06-16 | 1995-04-05 | ケミカルグラウト株式会社 | Control method of finished pile diameter in consolidation pile construction. |
JP5421206B2 (en) * | 2010-08-24 | 2014-02-19 | 三信建設工業株式会社 | Ground improvement method and equipment |
JP4926293B1 (en) * | 2011-09-22 | 2012-05-09 | 有限会社シモダ技術研究所 | Ground improvement method |
JP6824796B2 (en) * | 2017-03-27 | 2021-02-03 | 大成建設株式会社 | Ground improvement body construction method |
JP7333535B1 (en) * | 2022-11-30 | 2023-08-25 | 株式会社富士建 | Equipment for soil improvement by medium-pressure jet stirring, ground improvement method by medium-pressure jet stirring |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5425842U (en) * | 1977-07-23 | 1979-02-20 | ||
JPS5948248B2 (en) * | 1983-01-25 | 1984-11-26 | 株式会社 エヌ、アイ、テイ | Ground improvement device using high pressure double injection |
JPS6149019A (en) * | 1984-08-17 | 1986-03-10 | Takenaka Komuten Co Ltd | Improvement work of sandy ground |
-
1988
- 1988-03-28 JP JP63074077A patent/JPH0637767B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH01247611A (en) | 1989-10-03 |
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