JP6829854B1 - Advanced injection device used in high-pressure injection stirring method - Google Patents
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- 238000002347 injection Methods 0.000 title claims abstract description 258
- 239000007924 injection Substances 0.000 title claims abstract description 258
- 238000000034 method Methods 0.000 title claims abstract description 43
- 238000003756 stirring Methods 0.000 title claims abstract description 24
- 239000007788 liquid Substances 0.000 claims abstract description 241
- 239000000463 material Substances 0.000 claims abstract description 182
- 238000010276 construction Methods 0.000 claims abstract description 27
- 230000008569 process Effects 0.000 claims abstract description 11
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 238000005553 drilling Methods 0.000 claims description 130
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 95
- 238000005086 pumping Methods 0.000 claims description 10
- 238000013019 agitation Methods 0.000 claims description 2
- 230000006872 improvement Effects 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 abstract 1
- 239000000243 solution Substances 0.000 abstract 1
- 229910000831 Steel Inorganic materials 0.000 description 13
- 239000010959 steel Substances 0.000 description 13
- 238000007796 conventional method Methods 0.000 description 6
- 238000009412 basement excavation Methods 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- 239000002002 slurry Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
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Abstract
【課題】先端噴射装置の大型化を招くことなく、新たな固化材液噴射手段を設けることで、施工能率を低下させることなく高強度の改良体造成を可能にする先端噴射装置を提供する。【解決手段】先端噴射装置は、圧縮エアの噴射を伴って固化材液を噴射する第１の固化材液噴射手段１０と、圧縮エアの噴射を伴うことなく固化材液を噴射する第２の固化材液噴射手段２０を有する。このうち、圧縮エアの噴射を伴う「第１の固化材液噴射手段１０」は、従来技術が具備する噴射孔と同様に、造成工程において地盤を切削・攪拌する役割を担うとともに、固化材を地盤中に投入する役割を担う。一方、本発明で新たに追加した「第２の固化材液噴射手段２０」は、改良体造成工程において固化材を地盤中に投入する役割を担う。追加した「第２の固化材液噴射手段２０」は、圧縮エアの噴射を伴わないため、切削能力は期待せずに固化材の注入および従来の噴射孔で攪拌後の地盤の再攪拌により改良品質の向上が望める。【選択図】図１PROBLEM TO BE SOLVED: To provide an advanced injection device capable of constructing a high-strength improved body without lowering the construction efficiency by providing a new solidifying material liquid injection means without inviting an increase in size of the advanced injection device. SOLUTION: A tip injection device has a first solidifying material liquid injection means 10 for injecting a solidifying material liquid with injection of compressed air, and a second solidifying material liquid for injecting the solidifying material liquid without injecting compressed air. It has a solidifying material liquid injection means 20. Of these, the "first solidifying material liquid injection means 10" that injects compressed air plays a role of cutting and agitating the ground in the construction process, as in the case of the injection holes provided in the prior art, and also forms the solidifying material. It plays the role of throwing it into the ground. On the other hand, the "second solidifying material liquid injection means 20" newly added in the present invention plays a role of injecting the solidifying material into the ground in the improved body forming step. Since the added "second solidifying material liquid injection means 20" does not involve injection of compressed air, it is improved by injecting the solidifying material and re-stirring the ground after stirring in the conventional injection hole without expecting cutting ability. Quality improvement can be expected. [Selection diagram] Fig. 1
Description
本発明は、高圧噴射攪拌工法で用いる先端噴射装置（自削孔モニター）に関するものであり、具体的には、固化材液や削孔水の送液経路を任意に選択できる機構を備えている先端噴射装置に関するものである。 The present invention relates to an advanced injection device (self-drilling hole monitor) used in a high-pressure injection stirring method, and specifically, includes a mechanism capable of arbitrarily selecting a liquid feeding path for a solidifying material liquid or drilling water. It relates to a tip injection device.
高圧噴射攪拌工法の分野では、セメント系固化材液（硬化材スラリー）を高圧で噴射するとともに、周囲に高速の空気噴射を行う「二重管工法」に分類される工法が一般的に用いられている。「二重管工法」の施工方法は、先端噴射装置を装着した二重管ロッドを用いて削孔から改良体造成（固化材液の噴射）を一連の流れの中で行う直接削孔方式と、削孔用ケーシングを用いて削孔を行った後に先端噴射装置を装着した二重管ロッドを建て込む先行削孔方式がある。 In the field of high-pressure injection stirring method, a method classified as "double pipe method" is generally used, in which a cement-based solidifying material liquid (hardened material slurry) is injected at high pressure and high-speed air is injected to the surroundings. ing. The construction method of the "double pipe construction method" is a direct drilling method in which an improved body is created (injection of solidifying material liquid) from drilling using a double pipe rod equipped with a tip injection device in a series of flows. , There is a pre-drilling method in which a double pipe rod equipped with a tip injection device is built after drilling using a casing for drilling.
高圧噴射攪拌工法の一例として、二重管工法の直接削孔方式による施工手順を図４に示す。直接削孔方式では、装置内部に送液経路（液体流路）を切り替える機構を有する先端噴射装置を使い、二重管ロッドの内管または外管から送った削孔水を先端噴射装置の先端の掘削ビットの近傍から噴射しながら地盤を削孔し、二重管ロッドおよび先端噴射装置を地盤中に挿入する。その後、送液経路を切り替え、二重管ロッドの内管から固化材液、外管から圧縮エアを送り、先端噴射装置に横向きに取り付けられた特殊孔から噴射し、ロッドを回転させながら引き上げることで柱状改良体を地中に造成する。 As an example of the high-pressure injection stirring method, FIG. 4 shows a construction procedure by the direct drilling method of the double pipe method. In the direct drilling method, a tip injection device having a mechanism for switching the liquid feeding path (liquid flow path) inside the device is used, and the drilling water sent from the inner pipe or the outer pipe of the double pipe rod is sent to the tip of the tip injection device. The ground is drilled while injecting from the vicinity of the excavation bit of the above, and the double pipe rod and the tip injection device are inserted into the ground. After that, the liquid feeding path is switched, the solidifying material liquid is sent from the inner pipe of the double pipe rod, and the compressed air is sent from the outer pipe, and the liquid is injected from the special hole attached sideways to the tip injection device, and the rod is pulled up while rotating. A columnar improved body will be created in the ground.
従来技術の先端噴射装置（自削孔モニター）を図３に示す。
従来の先端噴射装置は、
・先端噴射装置の先端に設けられた掘削ビット１０２と、
・先端噴射装置の先端に設けられ、削孔水を噴射する削孔水噴射ノズル１０５と、
・先端噴射装置の側面に設けられ、圧縮エアの噴射を伴って固化材液を横向きに噴射する固化材液噴射手段１１０と、
・削孔時には削孔水が通り、造成時には固化材液が通る液体圧送流路１４１（共用流路）と、
・液体圧送流路１４１に繋がる流路であって、削孔時に削孔水が通る削孔水用流路１４５と、
・圧縮エア噴射ノズルに向けて圧縮エアを導く圧縮エア流路１４７を
有している。
FIG. 3 shows a conventional advanced injection device (self-cutting hole monitor).
The conventional advanced injection device
The excavation bit 102 provided at the tip of the tip injection device and
A drilling water injection nozzle 105 provided at the tip of the tip injection device to inject drilling water,
The solidifying material liquid injection means 110, which is provided on the side surface of the tip injection device and injects the solidifying material liquid laterally with the injection of compressed air,
-A liquid pumping flow path 141 (common flow path) through which the drilling water passes during drilling and the solidifying material liquid passes during construction.
-A flow path connected to the liquid pumping flow path 141, which is a flow path for drilling water through which drilling water passes during drilling, and a flow path for drilling water 145.
-Has a compressed air flow path 147 that guides compressed air toward the compressed air injection nozzle.
固化材液噴射手段１１０は、
・先端噴射装置の側面に設けられた固化材液噴射ノズル１１１、
・固化材液噴射ノズルの近傍に設けられた圧縮エア噴射ノズル１１２
から構成されている。
固化材液噴射ノズル１１１と圧縮エア噴射ノズル１１２は機能的に一対の関係にあり、圧縮エア噴射ノズル１１２から圧縮エアを高圧で噴射しつつ、同時に、固化材液噴射ノズル１１１から固化材液を噴射することで、当該固化材液が圧縮エアの噴射を伴って横向きに噴射される。
The solidifying material liquid injection means 110
-The solidifying material liquid injection nozzle 111 provided on the side surface of the tip injection device,
-Compressed air injection nozzle 112 provided in the vicinity of the solidifying material liquid injection nozzle
It is composed of.
The solidifying material liquid injection nozzle 111 and the compressed air injection nozzle 112 are functionally in a pair relationship, and while injecting compressed air from the compressed air injection nozzle 112 at high pressure, the solidifying material liquid is simultaneously injected from the solidifying material liquid injection nozzle 111. By injecting, the solidifying material liquid is injected laterally with the injection of compressed air.
二重管ロッドの内管は、先端噴射装置内部の液体圧送流路１４１と削孔水用流路１４５につながっている。
二重管ロッドの外管は、先端噴射装置内部の圧縮エア流路１４７につながっている。
The inner pipe of the double pipe rod is connected to the liquid pressure feeding flow path 141 and the drilling water flow path 145 inside the tip injection device.
The outer pipe of the double pipe rod is connected to the compressed air flow path 147 inside the tip injection device.
削孔時には、二重管ロッドの内管を介して削孔水が送られ、さらに、先端噴射装置の液体圧送流路１４１とその先の削孔水用流路１４５を通り、削孔水噴射ノズル１０５から削孔水が吐出する。
削孔を終えて改良体を造成する際には、先端噴射装置内部の送液経路を、削孔水用の送液経路から固化材液用の送液経路に切り替える。
改良体造成時には、二重管ロッドの内管を介して固化材液が送られ、さらに、先端噴射装置内部の液体圧送流路１４１を通り、固化材液噴射ノズル１１１から固化材液が噴射する。このとき、固化材液噴射ノズル１１１の近傍には圧縮エア噴射ノズルが設けられているため、固化材液噴射ノズル１１１からの固化材液は、圧縮エアを伴って噴射される。
At the time of drilling, the drilling water is sent through the inner pipe of the double pipe rod, and further, the drilling water is injected through the liquid pressure feeding flow path 141 of the tip injection device and the drilling water flow path 145 beyond it. Drilling water is discharged from the nozzle 105.
When the improved body is created after the drilling is completed, the liquid feeding path inside the tip injection device is switched from the liquid feeding path for the drilled water to the liquid feeding path for the solidifying material liquid.
At the time of constructing the improved body, the solidifying material liquid is sent through the inner pipe of the double pipe rod, and further, the solidifying material liquid is injected from the solidifying material liquid injection nozzle 111 through the liquid pressure feeding flow path 141 inside the tip injection device. .. At this time, since the compressed air injection nozzle is provided in the vicinity of the solidifying material liquid injection nozzle 111, the solidifying material liquid from the solidifying material liquid injection nozzle 111 is injected together with the compressed air.
先端噴射装置内部の送液経路の切り替えは、例えば図３（Ｂ）に示すように、二重管ロッドの内管を介して装置内にスチールボール１５１を投入して削孔水と固化材液の流路を切り替える方法が一般的に用いられている。スチールボール１５１で削孔水用経路１４５を閉塞することで、液体圧送流路１４１を介して送られた固化材液が（削孔水噴射ノズル１０５から吐出することなく）固化材液噴射ノズル１１１から噴射される。 To switch the liquid feeding path inside the tip injection device, for example, as shown in FIG. 3B, a steel ball 151 is thrown into the device via the inner pipe of the double pipe rod to drill water and solidify material liquid. A method of switching the flow path of the above is generally used. By blocking the drilling water path 145 with the steel ball 151, the solidifying material liquid sent through the liquid pressure feeding flow path 141 (without being discharged from the drilling water injection nozzle 105) is solidified material liquid injection nozzle 111. Is jetted from.
前述のとおり、二重管工法をはじめとする高圧噴射攪拌工法では、固化材液（硬化材スラリー）を圧縮エアとともに地盤中に高圧で噴射することにより、地盤を切削し固化材液と混合攪拌することにより改良体を造成する。 As described above, in the high-pressure injection stirring method such as the double pipe method, the solidifying material liquid (hardened material slurry) is injected into the ground together with the compressed air at high pressure to cut the ground and mix and stir with the solidifying material liquid. By doing so, an improved body is created.
改良体造成工程において、地盤を切削する能力は、先端噴射装置からの固化材液の噴射圧力、単位時間当たりの噴射量、圧縮エアの単位時間当たりの噴射量などで決まる。したがって、固化材液の単位噴射量を大きくすることで地盤を切削する能力を高めることができる。逆に言えば、地盤を切削する能力を高めたい場合には、固化材液の単位噴射量を大きくする。 In the improved body construction process, the ability to cut the ground is determined by the injection pressure of the solidifying material liquid from the tip injection device, the injection amount per unit time, the injection amount of compressed air per unit time, and the like. Therefore, the ability to cut the ground can be enhanced by increasing the unit injection amount of the solidifying material liquid. Conversely, if it is desired to increase the ability to cut the ground, the unit injection amount of the solidifying material liquid is increased.
一方、造成する改良体の強度は、地盤中に投入する固化材（硬化材）の量で決まる。したがって、地盤への固化材の投入量を増やすことで改良体強度を高めることが出来る。逆に言えば、造成する改良体の強度を高めたい場合には、固化材の投入量を増やす。 On the other hand, the strength of the improved body to be created is determined by the amount of solidifying material (hardening material) to be put into the ground. Therefore, the strength of the improved body can be increased by increasing the amount of the solidifying material input to the ground. Conversely, if it is desired to increase the strength of the improved body to be created, the amount of solidifying material input is increased.
このため、二重管工法をはじめとする高圧噴射攪拌工法では一般的に、期待する改良体の「径」に合わせて、固化材液の噴射圧力と単位噴射量、および圧縮エアの単位噴射量などを定めている。また、期待する改良体の「強度」に合わせて、固化材の投入量、すなわち造成速度（時間）を定めている。 For this reason, in the high-pressure injection stirring method such as the double pipe method, generally, the injection pressure and unit injection amount of the solidifying material liquid and the unit injection amount of compressed air are adjusted according to the expected "diameter" of the improved body. And so on. In addition, the input amount of the solidifying material, that is, the formation speed (time) is determined according to the expected "strength" of the improved body.
以上より、通常より高強度の改良体の造成が必要な場合、通常は、固化材液の単位噴射量を高めることはせず、造成時間を多くとることで固化材の投入量を高める方法がとられている。ところが、この場合、高強度の改良体を造成する場合に施工時間が長くなり施工能率が低下するという問題が生ずる。 From the above, when it is necessary to create an improved body with higher strength than usual, usually, the unit injection amount of the solidifying material liquid is not increased, but a method of increasing the input amount of the solidifying material by increasing the forming time is used. It has been taken. However, in this case, when creating a high-strength improved body, there arises a problem that the construction time becomes long and the construction efficiency decreases.
そこで、従来同等の固化材液の噴射口を先端噴射装置に増設することが検討された。しかしながら、この場合、切削能力を高めることなく固化材液の単位投入量を高めることが出来るが、先端噴射装置の構造が複雑になるため、大型化が必要である。 Therefore, it was considered to add an injection port for the solidifying material liquid equivalent to the conventional one to the advanced injection device. However, in this case, although the unit input amount of the solidifying material liquid can be increased without increasing the cutting ability, the structure of the advanced injection device becomes complicated, so that it is necessary to increase the size.
上述した問題に鑑み、本発明の目的は、先端噴射装置の大型化を招くことなく、新たな固化材液噴射手段を設けることで、施工能率を低下させることなく高強度の改良体造成を可能にする先端噴射装置とこれを用いた高圧噴射攪拌工法を提供することにある。
In view of the above-mentioned problems, an object of the present invention is to provide a new solidifying material liquid injection means without inviting an increase in size of the advanced injection device, thereby enabling the construction of a high-strength improved body without lowering the construction efficiency. It is an object of the present invention to provide an advanced injection device and a high-pressure injection stirring method using the advanced injection device.
前述した課題を解決すべく、本発明に係る先端噴射装置は次の特徴を備えている。
（１） 従来工法では固化材液噴射時に閉塞していた削孔水用経路を利用して固化材投入及び攪拌を補助する噴射口を追加する。
（２） 削孔水経路（追加の噴射口用経路）において、削孔と固化材液噴射を切替える装置を設置する。
In order to solve the above-mentioned problems, the advanced injection device according to the present invention has the following features.
(1) An injection port is added to assist the solidifying material injection and stirring by utilizing the perforated water path that was blocked when the solidifying material liquid was injected in the conventional method.
(2) In the drilling water path (additional injection port path), a device for switching between drilling and solidifying material liquid injection will be installed.
すなわち、前述した目的は、
削孔水を噴射するための削孔水噴射手段と、
圧縮エアを伴った固化材液（圧縮エアを伴った固化材噴流）を噴射するための第１の固化材液噴射手段と、
圧縮エアを伴わない固化材液（圧縮エアを伴わない固化材噴流）を噴射するための第２の固化材液噴射手段と、
削孔時には前記削孔水噴射手段に向けて削孔水を送液し、改良体造成時には前記第１および第２の固化材液噴射手段に向けて固化材液を送液するための第１の液体圧送流路と、
前記第１の液体圧送流路に通ずる流路であって、削孔時には前記削孔水噴射手段に向けて削孔水を送液し、改良体造成時には前記第２の固化材液噴射手段に向けて固化材液を送液するための第２の液体圧送流路と、
前記第２の液体圧送流路に通ずる流路であって、削孔時に前記削孔水噴射手段に向けて削孔水を送液するための、削孔水用流路と、
を有する先端噴射装置によって達成される。
That is, the above-mentioned purpose is
Drilling water injection means for injecting drilling water and
A first solidifying material liquid injection means for injecting a solidifying material liquid accompanied by compressed air (a solidifying material jet accompanied by compressed air), and
A second solidifying material liquid injection means for injecting a solidifying material liquid without compressed air (a solidifying material jet without compressed air), and
At the time of drilling, the drilling water is sent toward the drilling water injection means, and at the time of forming an improved body, the first solidifying material liquid is sent toward the first and second solidifying material liquid injection means. Liquid pumping flow path and
A flow path leading to the first liquid pressure feeding flow path, in which the drilling water is sent toward the drilling water injection means at the time of drilling, and to the second solidifying material liquid injection means at the time of constructing an improved body. A second liquid pressure feed flow path for feeding the solidifying material liquid toward
A flow path leading to the second liquid pressure feeding flow path, which is a flow path for drilling water for sending the drilling water toward the drilling water injection means at the time of drilling.
Achieved by an advanced injection device with.
また、上記先端噴射装置は、削孔を終えて改良体造成を開始する際に、先端噴射装置が具備する送液経路を、削孔水用送液経路から固化材液用送液経路に切り替えるための、送液経路切り替え手段を、更に有している。 Further, the advanced injection device switches the liquid feeding path provided by the advanced injection device from the drilling water feeding path to the solidifying material liquid feeding path when the drilling is completed and the construction of the improved body is started. Further, it has a liquid feeding route switching means for the purpose.
上記送液経路切り替え手段は、例えば、削孔水用流路を閉塞するための球状弁体や差圧弁で構成する。 The liquid feeding route switching means is composed of, for example, a spherical valve body or a differential pressure valve for closing the perforated water flow path.
また、前述した目的は、
ロッド先端に装着した先端噴射装置の削孔水噴射手段から削孔水を噴射しながら削孔を行う削孔工程と、
削孔を終えて改良体造成を開始する前に、先端噴射装置が具備する送液経路を、削孔水用送液経路から固化材液用送液経路に切り替える、送液経路切り替え工程と、
ロッドを回転させながら引き上げる過程で、ロッド先端に装着した先端噴射装置の第１の固化材液噴射手段から圧縮エアを伴った固化材液を噴射するとともに、先端噴射装置の第２の固化材液噴射手段から圧縮エアを伴わない固化材液を噴射する、改良体造成工程と、を含む高圧噴射攪拌工法によって達成される。
In addition, the above-mentioned purpose is
The drilling process of drilling while injecting drilling water from the drilling water injection means of the tip injection device mounted on the rod tip,
A liquid feeding route switching process in which the liquid feeding path provided by the advanced injection device is switched from the drilling water feeding path to the solidifying material liquid feeding path before the drilling is completed and the construction of the improved body is started.
In the process of pulling up the rod while rotating it, the solidifying material liquid with compressed air is injected from the first solidifying material liquid injection means of the tip injection device mounted on the rod tip, and the second solidifying material liquid of the tip injection device is injected. It is achieved by a high-pressure injection stirring method including an improved body construction step of injecting a solidifying material liquid without compressed air from an injection means.
本発明の先端噴射装置は、
・圧縮エアの噴射を伴って固化材液を噴射する第１の固化材液噴射手段と、
・圧縮エアの噴射を伴うことなく固化材液を噴射する第２の固化材液噴射手段を
有している。
このうち、圧縮エアの噴射を伴う「第１の固化材液噴射手段」は、従来技術が具備する固化材液噴射手段と同様に、改良体造成工程において地盤を切削・攪拌する役割を担うとともに、固化材を地盤中に投入する役割を担う。すなわち、「第１の固化材液噴射手段」は、従来技術が具備する固化材液噴射手段と、機能的に同等である。
一方、本発明で新たに追加された「第２の固化材液噴射手段」は、改良体造成工程において固化材を地盤中に投入する役割を担っている。なお、第２の固化材液噴射手段は、圧縮エアの噴射を伴わないため、改良体造成工程において地盤を切削・攪拌する役割を担うものではない。この点で、第２の固化材液噴射手段は、第１の固化材液噴射手段と相違する。
したがって、本発明の先端噴射装置は、従来技術の先端噴射装置が具備する固化材液噴射手段と同等の固化材液噴射手段（第１の固化材液噴射手段）を備えており、これに加えて、圧縮エアの噴射を伴わない追加の固化材液噴射手段（第２の固化材液噴射手段）を備えているといえる。この出願では、第２の固化材液噴射手段を必要に応じて、「追加の固化材液噴射手段」という。
The advanced injection device of the present invention
-The first solidifying material liquid injection means for injecting the solidifying material liquid with the injection of compressed air, and
-It has a second solidifying material liquid injection means that injects the solidifying material liquid without injecting compressed air.
Of these, the "first solidifying material liquid injection means" that involves the injection of compressed air plays a role of cutting and stirring the ground in the improved body construction process, similar to the solidifying material liquid injection means provided in the prior art. , Plays the role of putting the solidifying material into the ground. That is, the "first solidifying material liquid injection means" is functionally equivalent to the solidifying material liquid injection means provided in the prior art.
On the other hand, the "second solidifying material liquid injection means" newly added in the present invention plays a role of injecting the solidifying material into the ground in the improved body forming step. Since the second solidifying material liquid injection means does not involve injection of compressed air, it does not play a role of cutting and stirring the ground in the improved body construction step. In this respect, the second solidifying material liquid injection means is different from the first solidifying material liquid injection means.
Therefore, the advanced injection device of the present invention is provided with a solidifying material liquid injection means (first solidifying material liquid injection means) equivalent to the solidifying material liquid injection means provided in the advanced injection device of the prior art, and in addition to this. Therefore, it can be said that the additional solidifying material liquid injection means (second solidifying material liquid injection means) that does not involve the injection of compressed air is provided. In this application, the second solidifying material liquid injection means is referred to as "additional solidifying material liquid injection means" as necessary.
追加の固化材液噴射手段（第２の固化材液噴射手段）は、圧縮エアの噴射を伴わないため、切削能力は期待せずに固化材の注入および従来の噴射孔で攪拌後の地盤の再攪拌により改良品質の向上が望める。 Since the additional solidifying material liquid injection means (second solidifying material liquid injection means) does not involve the injection of compressed air, the solidifying material is injected without expecting cutting ability, and the ground is agitated with the conventional injection holes. Improvement of improved quality can be expected by re-stirring.
また、追加の固化材液噴射手段（第２の固化材液噴射手段）は、圧縮エアの噴射を伴わず、また、追加の固化材液噴射手段への固化材液の送液に（従来技術が具備する削孔水用流路に相当する）第２の液体圧送流路を活用していることから、複雑な機構を持たない極めて簡易な構造の追加で済む。そのため、二重管ロッドや先端噴射装置などの大きさは従来と同サイズのものを使えることから、削孔設備も従来技術と同等のもので施工が行える。 Further, the additional solidifying material liquid injection means (second solidifying material liquid injection means) does not involve injection of compressed air, and also for sending the solidifying material liquid to the additional solidifying material liquid injection means (conventional technique). Since the second liquid pressure feed flow path (corresponding to the perforated water flow path provided by the above) is utilized, it is sufficient to add an extremely simple structure without a complicated mechanism. Therefore, since the size of the double pipe rod, the tip injection device, etc. can be the same as that of the conventional one, the drilling equipment can be constructed with the same size as the conventional technique.
上記の特徴を具備する本発明によれば、従来の改良体造成に係わる流路や形状に変化がないことから地盤の切削・攪拌の性能に影響をおよぼすことなく、従来の性能を維持したまま固化材の単位時間当たりの噴射量を増やすことができる。 According to the present invention having the above-mentioned characteristics, since there is no change in the flow path or shape related to the conventional improvement body construction, the conventional performance is maintained without affecting the cutting / stirring performance of the ground. The injection amount of the solidifying material per unit time can be increased.
高強度改良体を造成する場合においては、従来技術では、引上げ速度を落とすことによって地盤中に投入する固化材料を増やしていたが、本発明では、固化材の単位吐出量を増やすことができることから施工速度を落とさず地盤中に投入する固化材量を増やすことができる。 In the case of creating a high-strength improved body, in the prior art, the amount of solidifying material to be put into the ground was increased by slowing down the pulling speed, but in the present invention, the unit discharge amount of the solidifying material can be increased. It is possible to increase the amount of solidifying material to be put into the ground without slowing down the construction speed.
また、従来技術と同等強度の改良体を造成する場合には、単位吐出量を増やすことにより引上げ速度を速くすることができることから、造成時間の短縮が可能となる。なお、追加の固化材液噴射手段（第２の固化材液噴射手段）が具備する固化材液噴射孔は径を変えることにより単位吐出量を1.5〜2.0倍の範囲で変化が出来る。 Further, in the case of producing an improved body having the same strength as that of the conventional technique, the pulling speed can be increased by increasing the unit discharge amount, so that the production time can be shortened. The unit discharge amount of the solidifying material liquid injection hole provided by the additional solidifying material liquid injection means (second solidifying material liquid injection means) can be changed in the range of 1.5 to 2.0 times by changing the diameter.
さらに、本発明の先端噴射装置は、送液経路切り替え手段を備えているので、先端噴射装置を地盤に挿入したままの状態で、任意のタイミングで送液経路を切り替えることができる。送液経路切り替え手段の具体例としては、例えば、球状弁体（スチールボール）を投入する方法や、差圧弁を使用する方法などが挙げられる。送液経路の切り替えを、差圧弁を使用することにより行う場合には、地盤改良体造成前のスチールボールの投入による器具の脱着の手間が省け、作業性や安全性の向上が図れる。 Further, since the advanced injection device of the present invention includes the liquid feeding path switching means, the liquid feeding path can be switched at an arbitrary timing while the advanced injection device is still inserted in the ground. Specific examples of the liquid feeding path switching means include a method of inserting a spherical valve body (steel ball) and a method of using a differential pressure valve. When the liquid feeding path is switched by using the differential pressure valve, it is possible to save the trouble of attaching and detaching the equipment by inserting the steel ball before the ground improvement body is constructed, and it is possible to improve the workability and safety.
以下、図１に基づいて、高圧噴射攪拌工法で用いる先端噴射装置について説明する。 Hereinafter, the advanced injection device used in the high-pressure injection stirring method will be described with reference to FIG.
本実施形態の先端噴射装置は、図１に示すとおり、
・先端噴射装置の先端に設けられた掘削ビット２と、
・削孔水を噴射するための削孔水噴射手段５と、
・圧縮エアを伴った固化材液を噴射する第１の固化材液噴射手段１０と、
・圧縮エアを伴うことなく固化材液を噴射する第２の固化材液噴射手段２０と、
・削孔時に削孔水が通り、改良体造成時に固化材液が通る第１の液体圧送流路４１と、
・削孔時に削孔水が通り、改良体造成時に固化材液が通る第２の液体圧送流路４２と、
・削孔時に削孔水が通る削孔水用流路４５と、
・圧縮エアが通る圧縮エア流路４７と、
を有している。
As shown in FIG. 1, the advanced injection device of this embodiment is
・ The excavation bit 2 provided at the tip of the tip injection device and
・ Drilling water injection means 5 for injecting drilling water and
A first solidifying material liquid injection means 10 for injecting a solidifying material liquid accompanied by compressed air, and
A second solidifying material liquid injection means 20 that injects the solidifying material liquid without being accompanied by compressed air, and
-The first liquid pumping flow path 41 through which the drilling water passes during drilling and the solidifying material liquid passes during the construction of the improved body, and
A second liquid pressure feed flow path 42 through which the drilling water passes during drilling and the solidifying material liquid passes during the construction of the improved body.
・ A channel 45 for drilling water through which drilling water passes during drilling,
-Compressed air flow path 47 through which compressed air passes and
have.
削孔水噴射手段５は、先端噴射装置の先端部に設けられた削孔水噴射ノズル（削孔水噴射孔）で構成されている。図１（Ａ）に示すように、削孔時において、削孔水噴射ノズルから掘進方向に向けて削孔水が噴射される。 The drilling water injection means 5 is composed of a drilling water injection nozzle (drilling water injection hole) provided at the tip of the tip injection device. As shown in FIG. 1 (A), at the time of drilling, the drilling water is injected from the drilling water injection nozzle in the drilling direction.
圧縮エアを伴った固化材噴流を噴射する第１の固化材液噴射手段１０は、
・固化材液を噴射する固化材液噴射ノズル１１（固化材液噴射孔）と、
・圧縮エアを噴射する圧縮エア噴射ノズル１２（エア噴射孔）を
有している。
圧縮エア噴射ノズル１２は、固化材液噴射ノズル１１に近接した位置に設けられている。
The first solidifying material liquid injection means 10 for injecting a solidifying material jet accompanied by compressed air is
-The solidifying material liquid injection nozzle 11 (solidifying material liquid injection hole) for injecting the solidifying material liquid, and
-Has a compressed air injection nozzle 12 (air injection hole) for injecting compressed air.
The compressed air injection nozzle 12 is provided at a position close to the solidifying material liquid injection nozzle 11.
第１の固化材液噴射手段１０が具備する固化材液噴射ノズル１１と圧縮エア噴射ノズル１２は、機能的に一対の関係にある。圧縮エア噴射ノズル１２から圧縮エアを高圧で噴射しつつ、同時に、固化材液噴射ノズル１１から固化材液を噴射することで、当該固化材液が圧縮エアの噴射を伴って横向きに噴射される。 The solidifying material liquid injection nozzle 11 and the compressed air injection nozzle 12 included in the first solidifying material liquid injection means 10 are functionally in a pair relationship. By injecting the compressed air from the compressed air injection nozzle 12 at a high pressure and at the same time injecting the solidifying material liquid from the solidifying material liquid injection nozzle 11, the solidifying material liquid is injected laterally with the injection of the compressed air. ..
圧縮エアを伴わない固化材噴流を噴射する第２の固化材液噴射手段２０は、固化材液噴射ノズルで構成される。第２の固化材液噴射手段２０は、圧縮エア噴射ノズルを有していない。したがって、第２の固化材液噴射手段２０からは、固化材液が圧縮エアを伴うことなく噴射される。この点で、第２の固化材液噴射手段２０は、第１の固化材液噴射手段１０と相違する。 The second solidifying material liquid injection means 20 for injecting a solidifying material jet without compression air is composed of a solidifying material liquid injection nozzle. The second solidifying material liquid injection means 20 does not have a compressed air injection nozzle. Therefore, the solidifying material liquid is injected from the second solidifying material liquid injection means 20 without being accompanied by compressed air. In this respect, the second solidifying material liquid injection means 20 is different from the first solidifying material liquid injection means 10.
第１の液体圧送流路４１（第１の共用流路）は、削孔時には、削孔水噴射手段５に通ずる第２の液体圧送流路４２に向けて削孔水を導く。また第１の液体圧送流路４１は、改良体造成時には、第１の固化材液噴射手段１０に向けて固化材液を導くとともに、第２の固化材液噴射手段２０に繋がる第２の液体圧送流路４２に向けて固化材液を導く。 At the time of drilling, the first liquid pressure feeding flow path 41 (first common flow path) guides the drilling water toward the second liquid pressure feeding flow path 42 leading to the drilling water injection means 5. Further, the first liquid pressure feeding flow path 41 guides the solidifying material liquid toward the first solidifying material liquid injection means 10 and connects to the second solidifying material liquid injection means 20 at the time of constructing the improved body. The solidifying material liquid is guided toward the pumping flow path 42.
第２の液体圧送流路４２（第２の共用流路）は、第１の液体圧送流路４１に繋がる流路であって、削孔時には第１の液体圧送流路４１からの削孔水を削孔水噴射手段５に向けて導く。また第２の液体圧送流路４２は、改良体造成時には、第１の液体圧送流路４１からの固化材液を第２の固化材液噴射手段２０に向けて導く。 The second liquid pressure feed flow path 42 (second common flow path) is a flow path connected to the first liquid pressure feed flow path 41, and at the time of drilling, the drilled water from the first liquid pressure feed flow path 41. Is guided toward the drilled water injection means 5. Further, the second liquid pressure feed flow path 42 guides the solidifying material liquid from the first liquid pressure feeding flow path 41 toward the second solidifying material liquid injection means 20 at the time of constructing the improved body.
なお、第２の液体圧送流路４２は、形状の点において、図３に示す従来技術の削孔水用流路１４５と部分的に一致するものであるが、第２の液体圧送流路４２は、削孔時には削孔水を、改良体造成時には固化材液を導くのに対し、従来技術の削孔水用流路１４５は、削孔時には削孔水を導き、改良体造成時には閉塞しているので、両者は機能の点で相違する。 The second liquid pumping flow path 42 partially coincides with the conventional technique for drilling water flow path 145 shown in FIG. 3 in terms of shape, but the second liquid pumping flow path 42 Guides the drilling water at the time of drilling and the solidifying material liquid at the time of forming the improved body, whereas the conventional technique for drilling water flow path 145 guides the drilling water at the time of drilling and closes at the time of forming the improved body. Therefore, they differ in terms of function.
削孔水用流路３０は、第２の液体圧送流路４２に繋がる流路であって、削孔時に削孔水噴射手段５に向けて削孔水を導く。 The drilling water flow path 30 is a flow path connected to the second liquid pressure feeding flow path 42, and guides the drilling water toward the drilling water injection means 5 at the time of drilling.
圧縮エア流路４７は、第１の固化材液噴射手段１０が具備する圧縮エア噴射ノズル１２に向けて圧縮エアを導く。 The compressed air flow path 47 guides the compressed air toward the compressed air injection nozzle 12 included in the first solidifying material liquid injection means 10.
削孔時には、第１の液体圧送流路４１と、これに繋がる第２の液体圧送流路４２と、更にこれに繋がる削孔水用流路４３の組み合わせから構成される流路が、「削孔水用送液経路」として機能する。
一方、改良体造成時には、第１の液体圧送流路４１と、これに繋がる第２の液体圧送流路４２の組み合わせから構成される流路が、「固化材液用送液経路」として機能する。
At the time of drilling, a flow path composed of a combination of a first liquid pressure feed flow path 41, a second liquid pressure feed flow path 42 connected to the first liquid pressure feed flow path 41, and a hole drilling water flow path 43 connected thereto is "drilled". It functions as a "liquid feeding route for pore water".
On the other hand, at the time of constructing the improved body, the flow path composed of the combination of the first liquid pressure feed flow path 41 and the second liquid pressure feed flow path 42 connected to the first liquid pressure feed flow path 41 functions as a "liquid feed path for solidifying material liquid". ..
先端噴射装置は、当該装置が具備する送液経路を「削孔水用送液経路」から「固化材液用送液経路」に切り替えるための、送液経路切り替え手段を具備している。本実施形態では、この送液経路切り替え手段は、削孔水用流路４５を閉塞可能なスチールボール５１（球状弁体）で構成されている。 The advanced injection device is provided with a liquid feeding route switching means for switching the liquid feeding path included in the device from the "drilling water feeding path" to the "solidifying material liquid feeding path". In the present embodiment, the liquid feeding path switching means is composed of a steel ball 51 (spherical valve body) capable of closing the drilling water flow path 45.
削孔を終えて改良体造成を開始する際に、二重管ロッドを介してスチールボール５１（球状弁体）を先端噴射装置内に送り込む。図１（Ｂ）に示すように、スチールボール５１が削孔水用流路４５を閉塞することで、先端噴射装置が具備する送液経路が、削孔水用送液経路から固化材液用送液経路に切り替わる。 When the drilling is completed and the construction of the improved body is started, the steel ball 51 (spherical valve body) is sent into the tip injection device via the double pipe rod. As shown in FIG. 1 (B), the steel ball 51 blocks the perforated water flow path 45, so that the liquid feeding path provided by the tip injection device is changed from the perforated water feeding path to the solidifying material liquid. Switch to the liquid delivery route.
なお、図１に示す実施形態では、送液経路切り替え手段としてスチールボール５１を採用しているが、これに限定されるものではない。例えば、図２に示すとおり、送液経路切り替え手段として差圧弁５３を採用してもよい。 In the embodiment shown in FIG. 1, the steel ball 51 is used as the liquid feeding path switching means, but the present invention is not limited to this. For example, as shown in FIG. 2, the differential pressure valve 53 may be adopted as the liquid feeding path switching means.
図２に示す差圧弁５３は、削孔水用経路４５に設けられており、当該差圧弁が受ける圧力に応じて、削孔水用経路４５を開放または閉塞する。具体的には、差圧弁５３が受ける圧力が低圧のときには（すなわち削孔時）、開弁状態となって削孔水用経路４５を開放し、また、差圧弁５３が受ける圧力が高圧のときには（すなわち改良体造成時）、閉弁状態となって削孔水用経路４５を閉塞する。 The differential pressure valve 53 shown in FIG. 2 is provided in the drilling water path 45, and opens or closes the drilling water path 45 according to the pressure received by the differential pressure valve. Specifically, when the pressure received by the differential pressure valve 53 is low (that is, when drilling), the valve is opened to open the drilling water path 45, and when the pressure received by the differential pressure valve 53 is high. (That is, at the time of constructing the improved body), the valve is closed and the drilling water path 45 is closed.
次に、上述した構成の先端噴射装置を用いた高圧噴射攪拌工法について説明する。 Next, a high-pressure injection stirring method using the advanced injection device having the above-described configuration will be described.
１．先端噴射装置の装着
はじめに、二重管ロッドの先端に先端噴射装置を装着する。
1. 1. Installation of tip injection device First, install the tip injection device at the tip of the double pipe rod.
２．削孔
次に、ボーリングマシンを用いて削孔を開始し、削孔深度に応じて二重管ロッドを継ぎ足しながら削孔を行う。削孔は、ロッド先端に装着した先端噴射装置の削孔水噴射手段５から削孔水を噴射しながら行う。削孔水は、二重管ロッドの内管を介して先端噴射装置に向けて圧送され、さらに、先端噴射装置内の液体圧送流路４１，４２と削孔水用流路４５を通り、削孔水噴射手段５から吐出される。
2. 2. Drilling Next, drilling is started using a boring machine, and drilling is performed while adding double pipe rods according to the drilling depth. Drilling is performed while injecting drilling water from the drilling water injection means 5 of the tip injection device mounted on the rod tip. The drilling water is pumped toward the tip injection device via the inner pipe of the double pipe rod, and further passes through the liquid pressure feed channels 41 and 42 and the drilling water flow path 45 in the tip injection device to drill holes. It is discharged from the pore water injection means 5.
３．送液経路の切り替え
目標深度までの削孔が完了したら、先端噴射装置が具備する送液経路を、削孔水用送液経路から固化材液用送液経路に切り替える。
送液経路切り替え手段として図１に示すスチールボール５１を採用している場合には、二重管ロッドを介して先端噴射装置内にスチールボール５１を送り込む。スチールボール５１が削孔水用流路４５を閉塞することで、先端噴射装置が具備する送液経路が、削孔水用送液経路から固化材液用送液経路に切り替わる。
送液経路切り替え手段として図２に示す差圧弁５３を採用している場合には、次の工程で固化材液の圧送を開始することで、先端噴射装置内の差圧弁５３が高圧の液圧を受けて閉弁し、先端噴射装置が具備する送液経路が、削孔水用送液経路から固化材液用送液経路に切り替わる。
3. 3. Switching the liquid feeding route When the drilling to the target depth is completed, the liquid feeding route provided by the advanced injection device is switched from the drilling water liquid feeding path to the solidifying material liquid feeding path.
When the steel ball 51 shown in FIG. 1 is used as the liquid feeding path switching means, the steel ball 51 is fed into the tip injection device via the double pipe rod. When the steel ball 51 closes the perforated water flow path 45, the liquid feed path provided by the tip injection device is switched from the perforated water feed path to the solidifying material liquid feed path.
When the differential pressure valve 53 shown in FIG. 2 is adopted as the liquid feeding path switching means, the pressure differential valve 53 in the tip injection device is charged with a high pressure by starting the pressure feeding of the solidifying material liquid in the next step. In response to this, the valve is closed, and the liquid feed path provided by the tip injection device is switched from the liquid feed path for perforated water to the liquid feed path for solidifying material liquid.
４．改良体の造成
二重管ロッドを回転させながら引き上げる過程で、二重管ロッドの内管を介して先端噴射装置に向けて固化材液を圧送する。同時に、二重管ロッドの外管を介して先端噴射装置に向けて圧縮エアを圧送する。
4. Preparation of improved body In the process of pulling up the double pipe rod while rotating it, the solidifying material liquid is pumped toward the tip injection device via the inner pipe of the double pipe rod. At the same time, compressed air is pumped toward the tip injection device via the outer tube of the double tube rod.
その結果、ロッド先端に装着した先端噴射装置の第１の固化材液噴射手段１０から、圧縮エアを伴った固化材液を噴射される。同時に、先端噴射装置の第２の固化材液噴射手段２０から圧縮エアを伴わない固化材液が噴射される。 As a result, the solidifying material liquid accompanied by the compressed air is injected from the first solidifying material liquid injection means 10 of the tip injection device mounted on the rod tip. At the same time, the solidifying material liquid without compressed air is injected from the second solidifying material liquid injection means 20 of the tip injection device.
このように、第１の固化材液噴射手段１０からの固化材液噴射と、第２の固化材液噴射手段２０からの固化材液噴射は、同時に行われる。したがって、本実施形態によれば、先端噴射装置の地盤への挿入と引き上げを繰り返す必要がない。 As described above, the solidifying material liquid injection from the first solidifying material liquid injection means 10 and the solidifying material liquid injection from the second solidifying material liquid injection means 20 are performed at the same time. Therefore, according to the present embodiment, it is not necessary to repeatedly insert and pull up the tip injection device into the ground.
２ 掘削ビット
５ 削孔水噴射手段（削孔水噴射ノズル／削孔水噴射孔）
１０ 第１の固化材液噴射手段
１１ 固化材液噴射ノズル（固化材液噴射孔）
１２ 圧縮エア噴射ノズル（エア噴射孔）
２０ 第２の固化材液噴射手段（固化材液噴射ノズル／固化材液噴射孔）
４１ 第１の液体圧送流路（第１の共用流路）
４２ 第２の液体圧送流路（第２の共用流路）
４５ 削孔水用流路
４７ 圧縮エア流路
５１ スチールボール（球状弁体）
５３ 差圧弁
１０２ 掘削ビット
１０５ 削孔水噴射ノズル（削孔水噴射孔）
１１０ 固化材液噴射手段
１１１ 固化材液噴射ノズル（固化材液噴射孔）
１１２ 圧縮エア噴射ノズル（エア噴射孔）
１４１ 液体圧送流路（共用流路）
１４５ 削孔水用流路
１４７ 圧縮エア流路
１５１ スチールボール
2 Drilling bit 5 Drilling water injection means (drilling water injection nozzle / drilling water injection hole)
10 First solidifying material liquid injection means 11 Solidifying material liquid injection nozzle (solidifying material liquid injection hole)
12 Compressed air injection nozzle (air injection hole)
20 Second solidifying material liquid injection means (solidifying material liquid injection nozzle / solidifying material liquid injection hole)
41 First liquid pumping flow path (first common flow path)
42 Second liquid pumping flow path (second common flow path)
45 Channel for drilling water 47 Compressed air channel 51 Steel ball (spherical valve body)
53 Differential pressure valve 102 Drilling bit 105 Drilling water injection nozzle (drilling water injection hole)
110 Solidifying material liquid injection means 111 Solidifying material liquid injection nozzle (solidifying material liquid injection hole)
112 Compressed air injection nozzle (air injection hole)
141 Liquid pressure feed flow path (common flow path)
145 Pore water flow path 147 Compressed air flow path 151 Steel ball
Claims (3)
改良体造成時に地盤を切削する役割を担う手段であって、圧縮エアを伴った固化材液を噴射するための第１の固化材液噴射手段と、
改良体造成時に地盤を切削する役割を担うものではない手段であって、圧縮エアを伴わない固化材液を噴射するための第２の固化材液噴射手段と、
削孔時には、前記削孔水噴射手段に通ずる第２の液体圧送流路に向けて削孔水を導き、改良体造成時には、前記第１の固化材液噴射手段に向けて固化材液を導くとともに、前記第２の固化材液噴射手段に繋がる第２の液体圧送流路に向けて固化材液を導くための第１の液体圧送流路と、
前記第１の液体圧送流路に通ずる流路であって、削孔時には、前記第１の液体圧送流路からの削孔水を削孔水噴射手段に向けて導き、改良体造成時には、前記第１の液体圧送流路からの固化材液を前記第２の固化材液噴射手段に向けて導くための第２の液体圧送流路と、
前記第２の液体圧送流路に通ずる流路であって、削孔時に削孔水噴射手段に向けて削孔水を導くための削孔水用流路と、
を有することを特徴とする、高圧噴射攪拌工法で用いる先端噴射装置。 Drilling water injection means for injecting drilling water and
A means for cutting the ground at the time of constructing an improved body, and a first solidifying material liquid injection means for injecting a solidifying material liquid accompanied by compressed air.
A second solidifying material liquid injection means for injecting a solidifying material liquid that does not involve compressed air , which is a means that does not play a role of cutting the ground during the construction of the improved body , and
At the time of drilling, the drilling water is guided toward the second liquid pressure feed flow path leading to the drilling water injection means, and at the time of forming the improved body, the solidifying material liquid is guided toward the first solidifying material liquid injection means. At the same time, a first liquid pressure feeding flow path for guiding the solidifying material liquid toward the second liquid pressure feeding flow path connected to the second solidifying material liquid injection means, and
It is a flow path leading to the first liquid pressure feeding flow path, and at the time of drilling, the drilling water from the first liquid pressure feeding flow path is guided toward the drilling water injection means, and at the time of constructing an improved body, the said A second liquid pressure feed flow path for guiding the solidifying material liquid from the first liquid pressure feeding flow path toward the second solidifying material liquid injection means, and
A flow path leading to the second liquid pumping flow path, which is a flow path for drilling water for guiding the drilling water toward the drilling water injection means at the time of drilling.
An advanced injection device used in a high-pressure injection agitation method, which comprises.
ロッド先端に装着した先端噴射装置の削孔水噴射手段から削孔水を噴射しながら削孔を行う削孔工程と、
削孔を終えて改良体造成を開始する前に、先端噴射装置が具備する送液経路を、削孔水用送液経路から固化材液用送液経路に切り替える、送液経路切り替え工程と、
ロッドを回転させながら引き上げる過程で、ロッド先端に装着した先端噴射装置の第１の固化材液噴射手段から圧縮エアを伴った固化材液を噴射するとともに、先端噴射装置の第２の固化材液噴射手段から圧縮エアを伴わない固化材液を噴射する、改良体造成工程と、を含むことを特徴とする高圧噴射攪拌工法。 A high-pressure injection stirring method using the advanced injection device according to claim 1 or 2.
The drilling process of drilling while injecting drilling water from the drilling water injection means of the tip injection device mounted on the rod tip,
A liquid feeding route switching process in which the liquid feeding path provided by the advanced injection device is switched from the drilling water feeding path to the solidifying material liquid feeding path before the drilling is completed and the construction of the improved body is started.
In the process of pulling up the rod while rotating it, the solidifying material liquid with compressed air is injected from the first solidifying material liquid injection means of the tip injection device mounted on the rod tip, and the second solidifying material liquid of the tip injection device is injected. A high-pressure injection stirring method comprising an improved body construction step of injecting a solidifying material liquid without compressed air from an injection means.
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