JPH11117287A - Ground improved body creating method and its device - Google Patents
Ground improved body creating method and its deviceInfo
- Publication number
- JPH11117287A JPH11117287A JP29770497A JP29770497A JPH11117287A JP H11117287 A JPH11117287 A JP H11117287A JP 29770497 A JP29770497 A JP 29770497A JP 29770497 A JP29770497 A JP 29770497A JP H11117287 A JPH11117287 A JP H11117287A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- rod
- ground improvement
- improvement body
- nozzles
- 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
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、建築構造物の基礎
の造成等なかんずく軟弱地盤の改良を目的として施工す
る地盤改良剤注入工法及びその装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for injecting a soil conditioner for construction of a soft ground, especially for building a foundation of a building structure.
【０００２】[0002]
【０００３】本発明は、構造的には、平成１年特許願第
３０７７号（出願日：平成１年１月１０日）の「地盤硬
化剤噴射注入装置」、及び平成１年特許願３３６１０５
号（出願日平成１年１２月２５日）の「三重構造の噴射
ノズルを有する地盤硬化財噴射注入装置及びその注入方
法」を従来技術とする。本発明と、当該従来技術とは、
産業上の両分野が同一であり、且つ、発明の目的が大径
の地盤改良体を造成せんとする点で同一である。又、本
件発明は、引用した上記の従来技術であるいわゆる三重
管の注入ロッドを前提としている点で共通する。以上が
直接的な先行技術ではあるが、全般的には、軟弱地盤の
硬化工法即ち軟弱地盤中に地盤改良体を造成する周知の
方法として、まず、掘削ロッドにて所定地盤まで削孔
し、ついで掘削ロッドに代えて硬化剤噴射ロッド若しく
は、両者を兼用したロッドにて回転上昇しつつ硬化剤を
噴射し、削孔することにより地盤改良体を造成する方法
が存在した。この代表例であって、草分け的な工法ない
し装置は、本件出願に係る発明者のいわゆるＣＣＰ工法
である。[0003] The present invention is structurally based on a "soil hardener injection / injection device" disclosed in Japanese Patent Application No. 3077/1999 (filing date: January 10, 1999) and a Japanese Patent Application No. 336105/1999.
No. (filing date: Dec. 25, 1999), "a ground hardening material injection and injection apparatus having an injection nozzle having a triple structure and a method for injecting the same," as a prior art. The present invention and the related art,
Both industrial fields are the same, and the object of the invention is the same in that a large-diameter ground improvement body is formed. Further, the present invention is common in that it is based on the so-called triple tube injection rod which is the above-mentioned prior art cited. Although the above is a direct prior art, as a whole, as a well-known hardening method of soft ground, that is, a well-known method of creating a ground improvement body in soft ground, first, a drilling rod is drilled to a predetermined ground, Then, instead of the excavation rod, there is a method of forming a ground improvement body by injecting a hardening agent while rotating and ascending with a hardening agent injection rod or a rod serving as both, and drilling holes. This representative example, which is a pioneering method or apparatus, is the so-called CCP method of the inventor of the present application.
【０００４】[0004]
【発明が解決しようとする課題】上記代表例であるＣＣ
Ｐ工法は、当時は画期的な工法であったが、次第により
効率よく、より大径の地盤改良体を造成せんとする競争
に移行してきた。SUMMARY OF THE INVENTION The above typical CC
The P method was an epoch-making method at the time, but it has gradually shifted to competition for more efficient and larger ground improvement bodies.
【０００５】従来工法の場合、地盤改良体を造成せんと
する所望深度の最下端迄 削孔し、その後ロッドを回転
上昇しつつ硬化剤を高圧噴射するわけであるが、その
際、地盤改良体造成のための硬化剤を噴射し、それによ
って、空洞部を形成し,該改良体を造成することとな
る。この場合、実際に地盤改良体を造成せんとする空洞
部は硬化剤噴射時に同時に形成されることとなるので、
清水若しくは硬化剤が、地盤に浸透し、掘削容易な状況
となる時間が無いか、少ないこととなる。その結果とし
て、当然ながら地盤改良体を造成しようとするための空
洞部は、勢い小さなものとなる。そのため、従来ロッド
内の注入管を単管から二重管或いは三重管へと改良する
と共に、硬化剤等の噴射圧を高めるなどの工夫がなされ
てきた。In the case of the conventional construction method, a hole is drilled to the lowermost end of a desired depth at which the ground improvement body is formed, and then the hardening agent is injected at a high pressure while rotating the rod upward. A curing agent for forming is sprayed, thereby forming a cavity and forming the improved body. In this case, the cavities that actually form the ground improvement body will be formed at the same time as the curing agent is injected,
There is little or no time for fresh water or hardener to penetrate the ground and make excavation easier. As a result, of course, the cavity for creating the ground improvement body has a small momentum. For this reason, various measures have been taken to improve the injection pipe in the rod from a single pipe to a double pipe or a triple pipe and to increase the injection pressure of a curing agent or the like.
【０００６】しかしながら、これらの発明でも、目標と
する効率的で且つ大径の地盤改良体を造成するには至ら
なかった。そこで、本発明は、以下の手段をとることに
より効率的で確実な大径の地盤改良体を造成することが
できることとなった。However, even with these inventions, the targeted efficient and large-diameter ground improvement could not be created. Therefore, according to the present invention, an efficient and reliable large-diameter ground improvement body can be formed by taking the following measures.
【０００７】[0007]
【課題を解決するための手段】第一手法として、互いに
隔絶された三流路の注入管とそれに連通する３つの噴射
ノズルを具備する注入ロッドを用いて地盤中に地盤改良
体を造成する地盤改良体造成工法において、まず、該注
入ロッドを、まず地盤改良体を造成せんとする所望の深
度の上端まで、削孔ビットにて回転しつつ削孔挿入し
（第１工程）、次いで、引き続き削孔しつつも、希望す
る地盤改良体造成のための空洞を予め形成すべく、清水
を、ロッド先端部にあるモニタ部近傍であって該ロッド
の軸上略同位置に設けられた第１及び第２噴射ノズルか
ら高圧噴射するとともに、該第１及び第２噴射ノズルの
後方、即ちスイベル側よりに設けられた第３噴射ノズル
から仕上げ用清水又はエアを高圧噴射しつつ、所望の深
度まで大径削孔し（第２工程）、最後に、所望深度から
後方へ注入ロッドを回転後退しつつ、上記第１、第２及
び第３噴射ノズルから硬化剤を高圧噴射し、所望の深度
上端、即ち形成希望の地盤改良体の上端まで該ロッドを
引き上げることにより（第３工程）、大径の地盤改良体
を造成する地盤改良体造成工法とそれに使用する装置を
提供する。SUMMARY OF THE INVENTION As a first method, a ground improvement is performed in which a ground improvement body is formed in the ground by using an injection pipe having three flow paths isolated from each other and three injection nozzles communicating therewith. In the body preparation method, first, the injection rod is drilled while rotating with a drill bit to the upper end of a desired depth at which the ground improvement body is to be formed (first step), and then the drill is continuously performed. In order to preliminarily form a cavity for forming a desired ground improvement body while drilling, fresh water is provided near the monitor portion at the rod tip and provided at substantially the same position on the axis of the rod. The high-pressure injection from the second injection nozzle and the high-pressure injection of fresh water or air for finishing from the third injection nozzle provided behind the first and second injection nozzles, that is, from the swivel side, to a desired depth. Drill holes ( 2) Finally, while the injection rod is rotated backward from the desired depth, the first, second, and third injection nozzles inject a high-pressure hardener from the above-described first, second, and third injection nozzles to obtain the desired upper end of the depth, that is, the ground improvement desired to be formed. A ground improvement body forming method for forming a large-diameter ground improvement body by raising the rod to the upper end of the body (third step) and an apparatus used for the method are provided.
【０００８】また、第二手法として、互いに隔絶された
三流路の注入管であって、それらの二流路に連通する二
つの噴射ノズルと他の一つの流路に連通する二者択一式
の二つの噴射ノズルを具備する注入ロッドを用いて地盤
中に地盤改良体を造成する地盤改良体造成工法におい
て、まず、該注入ロッドを、上記の二者択一式の噴射ノ
ズルの内、当該注入ロッドの先端部に設けられた第４噴
射ノズルにて清水を噴射しつつ、所望の深度の上端ま
で、削孔ビットにて回転削孔しつつ挿入し（第１工
程）、次いで、引き続き削孔しつつも、希望する地盤改
良体造成のための空洞を予め形成すべく、清水をロッド
先端部にあるモニター部近傍に設けられた第１及び第２
噴射ノズルから高圧噴射すると共に、上記ロッド先端部
の第４噴射ノズルを原則的に閉鎖し、その後方すなわち
第１及び第２噴射ノズルと注入ロッド軸上同位置であっ
て、３つのノズルが該ロッド円周に対し略等角度になる
ように設けられた第３噴射ノズルからも清水又はエアを
高圧噴射しつつ、所望の深度まで大径削孔し（第２工
程）、最後に、所望深度から後方へ注入ロッドを回転後
退しつつ、上記第１、第２及び第３噴射ノズルから硬化
剤を高圧噴射し、所望の深度上端、即ち、形成希望の地
盤改良体の上端まで該ロッドを引き上げることにより
（第３工程）、大径の地盤改良体を造成する地盤改良体
造成工法とそれに使用する装置を提供する。[0008] As a second method, an injection pipe having three flow paths separated from each other and having two injection nozzles communicating with the two flow paths and an alternative type of injection pipe communicating with another flow path is also provided. In a ground improvement body forming method for forming a ground improvement body in the ground using an injection rod having two injection nozzles, first, the injection rod is inserted into the injection rod of the above-described alternative injection nozzle. While injecting fresh water with the fourth injection nozzle provided at the tip of the nozzle, insert while rotating and drilling with a drill bit to the upper end of the desired depth (first step), and then continue drilling In addition, in order to preliminarily form a cavity for forming a desired ground improvement body, first and second waters are provided near the monitor at the rod tip.
A high pressure injection is performed from the injection nozzle, and the fourth injection nozzle at the rod tip is closed in principle, and the rear of the injection nozzle is located at the same position on the injection rod axis as the first and second injection nozzles, and the three nozzles are A large diameter hole is drilled to a desired depth while injecting high pressure of fresh water or air from a third injection nozzle provided at substantially the same angle with respect to the rod circumference (second step). While rotating the injection rod backward from behind, a high-pressure injection of a hardening agent is performed from the first, second, and third injection nozzles, and the rod is pulled up to a desired upper end of the depth, that is, an upper end of the ground improvement body desired to be formed. By this (third step), a ground improvement body forming method for forming a large diameter ground improvement body and an apparatus used for the method are provided.
【０００９】[0009]
【作用】上記第１工程は従来の初期段階の工程である
が、第２工程に於いて清水を対象地盤に十分に浸透させ
つつ、該高圧水によって対象地盤を十分に掘削すること
ができる。特に、第一手法によれば、図１にて示すよう
に第１及び第２噴射ノズルから高圧噴射した清水をまず
浸透させつつ掘削進行し、さらに、ロッドの後方に有る
第３噴射ノズルから清水またはエアを高圧噴射すること
により、上記噴射で掘削容易となった状態の地盤を再
度、高圧噴射するため、より大径の地盤改良体用空洞を
形成することができる。The first step is a conventional initial step. In the second step, the target ground can be sufficiently excavated by the high-pressure water while the fresh water is sufficiently penetrated into the target ground. In particular, according to the first method, as shown in FIG. 1, the excavation proceeds while first penetrating the fresh water injected from the first and second injection nozzles at high pressure, and further proceeds from the third injection nozzle located behind the rod. Alternatively, by injecting air at a high pressure, the ground in a state where excavation is facilitated by the above-described injection is again injected at a high pressure, so that a cavity for a ground improvement body having a larger diameter can be formed.
【００１０】他方、上記第二手法の場合、注入ロッドの
同位置に等角度にて３つの噴射ロッドが設けてあるた
め、上記第一手法と異なり、一気に地盤改良体用空洞部
を形成することができる。On the other hand, in the case of the second method, three injection rods are provided at the same position on the injection rod at the same angle, so that unlike the first method, the cavity for the ground improvement body is formed at a stroke. be able to.
【００１１】[0011]
【発明の実施の形態】以下、図面を引用しつつ本発明の
実施の形態について説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明に係る第１の実施形態であ
る注入ロッド１０を示す概略図である。本図によれば、
注入ロッド１０の先端部のみを示しているが、まず、最
先端部には削孔ロッドの機能をも有しているため、ビッ
ト１８を有している。 このビットは、本発明を実施す
る際の第１工程である所望深度までの削孔に機能する。
該ビット１８の近傍には、モニター部１９が設けられて
おり、さらにその近傍には、第１噴射ノズル１２及び第
２噴射ノズル１３が設けられている。また、当該第１及
び第２噴射ノズルの後方即ちスイベル側よりには、第３
噴射ノズル１４が設けられている。第１及び第２噴射ノ
ズルは該注入ロッド軸上同位置にあるが、第３噴射ノズ
ル１４は、一つのみ別位置に存在することとなる。これ
により、水切りによる削孔が時差式により行われる所に
本件発明の特徴がある。FIG. 1 is a schematic view showing an injection rod 10 according to a first embodiment of the present invention. According to this figure,
Although only the tip end of the injection rod 10 is shown, the tip end has a bit 18 because it also has the function of a drilling rod. This bit functions for drilling to a desired depth, which is the first step in practicing the present invention.
A monitor unit 19 is provided near the bit 18, and a first injection nozzle 12 and a second injection nozzle 13 are further provided near the monitor unit 19. Also, the third and third swirl nozzles are located behind the first and second injection nozzles.
An injection nozzle 14 is provided. The first and second injection nozzles are located at the same position on the injection rod axis, but only the third injection nozzle 14 is located at another position. Thus, a feature of the present invention resides in that drilling by draining is performed by a time difference method.
【００１３】さらに具体的に説明をすると、第１噴射ノ
ズル１２と第２噴射ノズル１３からは、むろん他の流体
若しくは気体を噴射することができるが、原則的に、清
水１５、１６を高圧噴射する。一方、第３噴射ノズル１
４からは、先の噴射により、ゆるんだ地盤をさらに掘削
するいわゆる仕上げ用清水又はエアを高圧噴射する。こ
れらの第１、第２及び第３噴射ノズルは、特に上述の地
盤改良体造成の為の空洞部を形成するための第２工程に
おいて特に重要な意義がある。More specifically, other fluids or gases can of course be injected from the first injection nozzle 12 and the second injection nozzle 13, but in principle, the fresh water 15, 16 is injected with high pressure. I do. On the other hand, the third injection nozzle 1
From 4, high-pressure injection of so-called finishing fresh water or air for excavating loose ground further by the previous injection is performed. These first, second and third injection nozzles have a particularly important significance in the second step for forming the cavity for the above-mentioned ground improvement body formation.
【００１４】図２は、本件発明に係る第２の実施形態を
示した概略図である。即ち、ロッド本体１１の先端部に
は、他の形態と同様ビット２７を有しているが、その最
先端中心部には、ロッド掘削進行用の第４噴射ノズル２
３を有している。この噴射ノズルからは、次の工程とし
て硬化剤を噴射しても良いが、第１工程及び地盤改良体
の空洞部を形成する第２工程にあっては、通常清水を噴
射しつつ注入ロッド１０を回転させ、掘削進行すること
となる。FIG. 2 is a schematic diagram showing a second embodiment according to the present invention. That is, the rod body 11 has a bit 27 at the tip end as in the other embodiments, but a fourth injection nozzle 2 for rod excavation progress is provided at the center of the tip.
Three. From this injection nozzle, a curing agent may be injected as the next step. However, in the first step and the second step for forming the cavity of the ground improvement body, the injection rod 10 is usually injected while fresh water is being injected. Is rotated, and the excavation proceeds.
【００１５】しかし、上記第３工程に入り、注入ロッド
１０を回転上昇させながら、硬化剤を噴射する場合、当
該第４噴射ノズル２３の手前付近において、従来手法で
あれば、地上より鋼球を落下させ、ノズルを閉鎖し、そ
れにより第１及び第２噴射ノズル２０、２１とロッド軸
上同位置、等角度に設けられた第３噴射ノズル２２から
も清水またはエアを噴射する。この場合、上記第１の実
施形態と異なり、いわゆる三重管の機能を生かし一気に
地盤改良体の空洞部を形成せんとする手法である。即
ち、三重管であって、それに連通する３つの噴射ノズル
を同位置、等角度に配置し、強力かつ一気に上記空洞部
を形成することにある。ちなみに、図２におけるロッド
本体１１内の破線は、三流路における流管２８、２９、
３０をそれぞれ示している。However, in the third step, when the hardening agent is injected while rotating the injection rod 10 while rotating the injection rod 10, the steel ball is removed from the ground near the fourth injection nozzle 23 by a conventional method. The nozzle is dropped and the nozzle is closed, whereby fresh water or air is also injected from the third injection nozzle 22 provided at the same position on the rod axis and at the same angle as the first and second injection nozzles 20 and 21. In this case, unlike the first embodiment, a method of forming a hollow portion of the ground improvement body at a stretch utilizing the function of a so-called triple pipe. That is, the present invention resides in a triple tube in which three injection nozzles communicating therewith are arranged at the same position and at the same angle, and the above-mentioned hollow portion is formed powerfully and at once. Incidentally, broken lines in the rod body 11 in FIG. 2 indicate flow tubes 28, 29,
30 are each shown.
【００１６】図３は、上記第２の実施形態におけるロッ
ド本体１１の軸に対しての直角断面図即ち、Ｂ−Ｂ'断
面図である。上述のように、第１、第２及び第３噴射ノ
ズル２０、２１、２２がそれぞれ略等角度に位置してい
ることがわかる。 従って、清水、エア又は硬化剤も図
中ａ、ｂ、ｃのように略等角度に高圧噴射される。本図
は、図２に対応したものであるが、図１におけるＡ−
Ａ’断面図の場合と同様となる。FIG. 3 is a sectional view perpendicular to the axis of the rod body 11 in the second embodiment, that is, a sectional view taken along the line BB '. As described above, it can be seen that the first, second, and third injection nozzles 20, 21, and 22 are located at substantially equal angles. Accordingly, high-pressure jets of clear water, air, or a curing agent are also formed at substantially equal angles as indicated by a, b, and c in the figure. This figure corresponds to FIG. 2, but corresponds to A-
This is the same as the case of the A ′ cross-sectional view.
【００１７】以下、図４、図５及び図６に従い、本件発
明に係る工程を説明する。The process according to the present invention will be described below with reference to FIGS. 4, 5 and 6.
【００１８】図４においては、注入ロッド本体１１を操
作機構（図示なし）にて回転させ、所望の対象地盤上端
部３３より第１、第２及び第３噴射ノズルから、主とし
て清水を高圧噴射しつつ削孔開始している状態を示して
いる。その場合、留意されるべきは、第１及び第２噴射
ノズルのみで、削孔する場合、一部実線及び破線３４で
示す空洞部のみが形成されることとなるが、仕上げ用の
第３噴射ノズルから、清水またはエアを高圧噴射する
と、実線３３と破線３２にて示す様に、より大径の空洞
部を形成することができるということである。その結果
は、図５にて示す通りである。In FIG. 4, the injection rod main body 11 is rotated by an operating mechanism (not shown), and high-pressure water is mainly injected from the first, second and third injection nozzles from the desired upper end 33 of the target ground. This shows a state in which drilling has begun. In this case, it should be noted that, when drilling holes only with the first and second injection nozzles, only a hollow part indicated by a solid line and a broken line 34 is formed, but the third injection for finishing is performed. When clear water or air is injected from the nozzle at a high pressure, a cavity having a larger diameter can be formed as shown by a solid line 33 and a broken line 32. The result is as shown in FIG.
【００１９】図６は、所望の大径空洞部を形成後、注入
ロッド本体１１を回転上昇させつつ、削孔時に主として
清水用として用いた３つの噴射ノズルを使用して、硬化
剤を高圧噴射する状態を示している。即ち、この硬化剤
噴射時に、造成すべき空洞部を形成するのではなく、図
４のごとく削孔機能を持った注入ロッドを掘削進行させ
る際、高圧水を噴射させることにより、予め削孔作業を
も行っている点に、重大な意義がある。FIG. 6 shows that after forming the desired large-diameter cavity, the injection rod main body 11 is rotated upward and the hardening agent is injected under high pressure using three injection nozzles mainly used for fresh water during drilling. It shows a state in which That is, instead of forming a cavity to be formed at the time of the injection of the hardening agent, a high-pressure water is injected to advance a drilling operation by injecting high-pressure water when an injection rod having a drilling function is excavated and advanced as shown in FIG. Has significant significance.
【００２０】[0020]
【発明の効果】本件発明は、対象地盤に掘削進行する際
に、大径の空洞部を形成し対象地盤下端に到達後注入ロ
ッドを回転上昇させつつ、地盤硬化剤を充填するという
ステップを踏む工法ないし装置である点に特に特徴があ
るが、削孔過程や硬化剤充填過程に無駄を無くすると同
時に効率よく大径の空洞部を形成でき、従って、初期の
目標通り確実に大径の地盤改良体を造成することができ
る。The present invention takes the steps of filling the ground hardening agent while forming a large-diameter cavity and rotating the injection rod after reaching the lower end of the target ground when excavating the target ground. Although it is a special feature in that it is a construction method or equipment, it can efficiently form a large diameter cavity at the same time as eliminating waste in the drilling process and hardener filling process, and therefore, reliably meet the initial target with a large diameter ground. An improved body can be created.
【００２１】具体的な効果を挙げると、上記第１及び第
２噴射ノズルから、清水を高圧噴射することにより、硬
化剤を噴射する前に予め空洞部を形成することができる
わけであるが、それのみならず、仕上げ用の第３噴射ノ
ズルより清水またはエアを高圧噴射することにより、先
の噴射により緩んだ対象地盤が更に掘削され、より、大
径の空洞部を形成することができる。To give a specific effect, by injecting clear water from the first and second injection nozzles at a high pressure, a cavity can be formed in advance before the hardener is injected. In addition, by injecting fresh water or air at a high pressure from the third injection nozzle for finishing, the target ground loosened by the previous injection is further excavated, so that a cavity having a larger diameter can be formed.
【図１】本発明に係る第１の実施形態を示す概略図であ
る。FIG. 1 is a schematic diagram showing a first embodiment according to the present invention.
【図２】本発明に係る第２の実施形態を示す概略図であ
る。FIG. 2 is a schematic diagram showing a second embodiment according to the present invention.
【図３】第２の実施形態である図２に於けるＢ−Ｂ’断
面図である。FIG. 3 is a sectional view taken along the line BB ′ in FIG. 2, which is a second embodiment.
【図４】本件発明に係る第１の実施形態に於ける工程図
である。FIG. 4 is a process chart in the first embodiment according to the present invention.
【図５】本件発明に係る第１の実施形態に於ける工程図
である。FIG. 5 is a process chart in the first embodiment according to the present invention.
【図６】本件発明に係る第１の実施形態に於ける工程図
である。FIG. 6 is a process chart in the first embodiment according to the present invention.
１０ 注入ロッド １１ 注入ロッド本体 １２、２０ 第１噴射ノズル １３、２１ 第２噴射ノズル １４、２２ 第３噴射ノズル １５、１６、２４、２５ 清水又は硬化剤 １７ 清水、エア又は硬化剤 １８、２７ ビット １９ モニター部 ２３ 第４噴射ノズル ２６ 清水又は硬化剤 ３１ スライム排出用間隙 ３２ 所望の空洞部 ３４ 第１及び第２噴射ノズルのみで形成された空洞部 ３５ 形成済み所望の空洞部 ３６ 硬化剤充填済み空洞部 Reference Signs List 10 injection rod 11 injection rod body 12, 20 first injection nozzle 13, 21 second injection nozzle 14, 22 third injection nozzle 15, 16, 24, 25 fresh water or hardener 17 fresh water, air or hardener 18, 27 bits DESCRIPTION OF SYMBOLS 19 Monitor part 23 4th injection nozzle 26 Fresh water or hardener 31 Slime discharge gap 32 Desired cavity 34 Cavity formed only by the 1st and 2nd injection nozzle 35 Preformed desired cavity 36 Filled with hardener Cavity
Claims (5)
に連通する３つの噴射ノズルを具備する注入ロッドを用
いて地盤中に地盤改良体を造成する地盤改良体造成工法
において、 まず、該注入ロッドを、地盤改良体を造成せんとする所
望の深度の上端まで、削孔ビットにて回転しつつ削孔挿
入し、 次いで、引き続き削孔しつつも、希望する地盤改良体造
成のための空洞を予め形成すべく、清水を、ロッド先端
部にあるモニタ部近傍であって該ロッドの軸上略同位置
に設けられた第１及び第２噴射ノズルから高圧噴射する
とともに、該第１及び第２噴射ノズルの後方、即ちスイ
ベル側よりに設けられた第３噴射ノズルから仕上げ用清
水又はエアを高圧噴射しつつ、所望の深度まで大径削孔
し、 最後に、所望深度から後方へ注入ロッドを回転後退しつ
つ、上記第１、第２及び第３噴射ノズルから硬化剤を高
圧噴射し、所望の深度上端、即ち形成希望の地盤改良体
の上端まで該ロッドを引き上げることにより、 大径の地盤改良体を造成することを特徴とする地盤改良
体造成工法。1. A ground improvement body construction method in which a ground improvement body is formed in the ground using an injection rod having three injection channels separated from each other and three injection nozzles communicating with the injection pipe. Insert the drill hole while rotating the rod with the drill bit to the upper end of the desired depth at which the ground improvement body is to be formed. Then, while drilling, continue to drill the desired ground improvement body formation. In order to form the water in advance, high-pressure water is injected from first and second injection nozzles provided near the monitor portion at the rod tip and substantially at the same position on the axis of the rod, and the first and (2) A large diameter hole is drilled to a desired depth while injecting finishing water or air at a high pressure from the third injection nozzle provided behind the injection nozzle, that is, from the swivel side. Rotate back While the first, second, and third injection nozzles inject a high-pressure hardening agent from the first, second, and third injection nozzles, and pull the rod up to the upper end of a desired depth, that is, the upper end of the ground improvement body desired to be formed, A ground improvement body creation method characterized by creating a ground.
て、それらの二流路に連通する二つの噴射ノズルと他の
一つの流路に連通する二者択一式の二つの噴射ノズルを
具備する注入ロッドを用いて地盤中に地盤改良体を造成
する地盤改良体造成工法において、 まず、該注入ロッドを、上記の二者択一式の噴射ノズル
の内、当該注入ロッドの先端部に設けられた第４噴射ノ
ズルにて清水を噴射しつつ、所望の深度の上端まで、削
孔ビットにて回転削孔しつつ挿入し、 次いで、引き続き削孔しつつも、希望する地盤改良体造
成のための空洞を予め形成すべく、清水をロッド先端部
にあるモニター部近傍に設けられた第１及び第２噴射ノ
ズルから高圧噴射すると共に、上記ロッド先端部の第４
噴射ノズルを原則的に閉鎖し、その後方すなわち第１及
び第２噴射ノズルと注入ロッド軸上同位置であって、３
つのノズルが該ロッド円周に対し略等角度になるように
設けられた第３噴射ノズルからも清水又はエアを高圧噴
射しつつ、所望の深度まで大径削孔し、 最後に、所望深度から後方へ注入ロッドを回転後退しつ
つ、上記第１、第２及び第３噴射ノズルから硬化剤を高
圧噴射し、所望の深度上端、即ち、形成希望の地盤改良
体の上端まで該ロッドを引き上げることにより、 大径の地盤改良体を造成することを特徴とする地盤改良
体造成工法。2. An injection pipe having three flow paths separated from each other, comprising two injection nozzles communicating with the two flow paths and two alternative injection nozzles communicating with another flow path. In the ground improvement body forming method of forming a ground improvement body in the ground using an injection rod to be formed, first, the injection rod is provided at the tip of the injection rod in the alternative type of injection nozzle. While injecting fresh water with the 4th injection nozzle, insert while rotating drilling with the drill bit to the upper end of the desired depth, and then continue drilling while creating the desired ground improvement body In order to preliminarily form a cavity, fresh water is injected at a high pressure from first and second injection nozzles provided near a monitor section at the rod tip, and the fourth water of the rod tip is formed.
The injection nozzle is closed in principle, behind it, ie at the same position on the injection rod axis as the first and second injection nozzles,
Three nozzles are provided at substantially the same angle with respect to the circumference of the rod. A large diameter hole is drilled to a desired depth while also injecting high-pressure fresh water or air from a third spray nozzle. While the injection rod is rotated backward, the hardener is injected at a high pressure from the first, second and third injection nozzles, and the rod is pulled up to a desired upper end of the depth, that is, an upper end of the ground improvement body desired to be formed. A ground improvement body formation method characterized by forming a large-diameter ground improvement body.
管、 該注入管を内蔵する注入ロッド、該注入ロッドを上下動
且つ回転させ得る操作機構、該注入管に連通する噴射ノ
ズル、清水又は気体若しくは地盤硬化剤の三種の流体を
それぞれ該噴射ノズルまで圧送する圧送ポンプ、及び三
重若しくは三本のスイベルからなる地盤改良体造成装置
において、 前記噴射ノズルの内二つ即ち、第１及び第２噴射ノズル
が、該注入ロッドの先端部近傍であって、注入ロッドの
軸上略同位置に設けられると共に、他の一つの第３噴射
ノズルを該第１及び第２噴射ノズル後方即ち、スイベル
側よりに設けられていることを特徴とする地盤改良体造
成装置。3. An injection pipe having three flow paths separated from each other, an injection rod containing the injection pipe, an operation mechanism capable of moving the injection rod up and down and rotating, an injection nozzle communicating with the injection pipe, fresh water or gas. Alternatively, in a pump for feeding three kinds of fluids of the ground hardening agent to the injection nozzle, and a ground improvement body forming device including triple or three swivels, two of the injection nozzles, that is, first and second injections A nozzle is provided near the tip of the injection rod and substantially at the same position on the axis of the injection rod, and the other third injection nozzle is positioned rearward of the first and second injection nozzles, that is, from the swivel side. A ground improvement body preparation device, which is provided in
るための第３噴射ノズルが、注入ロッドの軸上であっ
て、第１及び第２噴射ノズルの後方、即ちスイベル側に
あるとともに、第１、第２及び第３噴射ノズルが、該注
入ロッドの円周に対し略等角度にあることを特徴とする
請求項３記載の地盤改良体造成装置。4. A third injection nozzle for injecting or injecting fresh water, air, or a curing agent is provided on the axis of the injection rod, behind the first and second injection nozzles, that is, on the swivel side, The ground improvement body forming apparatus according to claim 3, wherein the first, second, and third injection nozzles are at substantially equal angles with respect to the circumference of the injection rod.
注入するための第１、第２及び第３噴射ノズルが、注入
ロッドの軸上略同位置にあって、該位置の円周に対し略
等角度に配置されていることを特徴とする請求項３記載
の地盤改良体造成装置。5. A first, second and third injection nozzles for injecting or injecting fresh water or a gas or a hardening agent are located at substantially the same position on the axis of the injection rod, and are located substantially on the circumference of the position. The ground improvement body forming device according to claim 3, wherein the devices are arranged at an equal angle.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29770497A JP3825896B2 (en) | 1997-10-15 | 1997-10-15 | Ground improvement body construction method and apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29770497A JP3825896B2 (en) | 1997-10-15 | 1997-10-15 | Ground improvement body construction method and apparatus |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH11117287A true JPH11117287A (en) | 1999-04-27 |
| JP3825896B2 JP3825896B2 (en) | 2006-09-27 |
Family
ID=17850090
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP29770497A Expired - Lifetime JP3825896B2 (en) | 1997-10-15 | 1997-10-15 | Ground improvement body construction method and apparatus |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3825896B2 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002097629A (en) * | 2000-09-27 | 2002-04-02 | Yamashin Kogyo Kk | Method and device for mixing and feeding mechanically stirred air and cement milk under pressure |
| JP2016113870A (en) * | 2014-12-18 | 2016-06-23 | 東鉄工業株式会社 | Ground improving method |
| CN108590508A (en) * | 2018-03-21 | 2018-09-28 | 张晓婷 | A kind of drilling device for building monitoring |
-
1997
- 1997-10-15 JP JP29770497A patent/JP3825896B2/en not_active Expired - Lifetime
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002097629A (en) * | 2000-09-27 | 2002-04-02 | Yamashin Kogyo Kk | Method and device for mixing and feeding mechanically stirred air and cement milk under pressure |
| JP2016113870A (en) * | 2014-12-18 | 2016-06-23 | 東鉄工業株式会社 | Ground improving method |
| CN108590508A (en) * | 2018-03-21 | 2018-09-28 | 张晓婷 | A kind of drilling device for building monitoring |
| CN108590508B (en) * | 2018-03-21 | 2019-09-24 | 湖北德纳建设有限公司 | It is a kind of for build monitoring drilling device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3825896B2 (en) | 2006-09-27 |
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