JPH061621Y2 - Triple tube rod tip device for ground improvement - Google Patents
Triple tube rod tip device for ground improvementInfo
- Publication number
- JPH061621Y2 JPH061621Y2 JP19962487U JP19962487U JPH061621Y2 JP H061621 Y2 JPH061621 Y2 JP H061621Y2 JP 19962487 U JP19962487 U JP 19962487U JP 19962487 U JP19962487 U JP 19962487U JP H061621 Y2 JPH061621 Y2 JP H061621Y2
- Authority
- JP
- Japan
- Prior art keywords
- flow path
- main body
- injection hole
- grout material
- extension
- 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
Landscapes
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
Description
【考案の詳細な説明】 産業上の利用分野 本考案は地盤改良用三重管ロッドの先端装置に関する。TECHNICAL FIELD The present invention relates to a tip device for a triple pipe rod for ground improvement.
従来の技術とその問題点 従来提供されている地盤改良用三重管ロッドの先端装置
は削孔能力がなく、従って三重管ロッドにより地盤改良
を行う場合には、ケーシングチューブにより孔壁が保護
されたガイドホールを削孔し、次にガイドホール内に三
重管ロッドを建込んで後、ケーシングチューブの引抜き
を必要とし、三重管ロッドの建込みに多大の時間と手数
を要していた。Conventional technology and its problems The tip device of the triple tube rod for ground improvement that has been provided so far does not have hole drilling ability, and therefore, when improving the ground with the triple tube rod, the hole wall was protected by the casing tube. After the guide hole was drilled and then the triple pipe rod was installed in the guide hole, it was necessary to pull out the casing tube, and it took a lot of time and labor to install the triple pipe rod.
本考案は、三重管ロッドの先端装置に削孔能力をもたせ
ることにより、上記従来の問題点を一掃しようとするも
のである。The present invention seeks to eliminate the above-mentioned conventional problems by making the tip device of the triple pipe rod have a drilling capability.
問題点を解決するための手段 本考案は、地盤改良用三重管ロッドの下端に接続される
先端装置本体と、該本体の下記流路の一つを適宜閉じる
閉塞部材との組合せ構造を有し、上記本体は上部に、上
記のロッドより高圧水の供給を受ける中心流路と、同ロ
ッドより高圧エア及びグラウト材の個別供給を受ける、
中心より外側の内外２本の流路を有していると共に下端
に、削孔水噴孔及びグラウト材噴孔を有するビットを具
備し、上記高圧水流路及び高圧エア流路は上記本体の上
部側壁に開口された上部噴孔に、またグラウト材流路は
下部側壁に開口された下部噴孔に接続され、更に高圧水
流路は、上記本体内を下方へ延長された第１延長流路を
介して下端ビットの削孔水噴孔に接続されていると共
に、第１延長流路の途中に、該流路内に適宜落し込まれ
る閉塞部材の受止部が設けられ、更にグラウト材流路は
本体内を下方へ延長された第２延長流路を介して上記下
端ビットのグラウト材噴孔に接続されていると共に、第
２延長流路の途中に開閉弁が備えられ、該開閉弁は通常
は閉状態を保持し、高圧水流路側よりの水圧を受けると
作動して開状態を保持するよう構成されていることを特
徴とするの地盤改良用三重管ロッドの先端装置係る。Means for Solving the Problems The present invention has a combination structure of a tip device main body connected to the lower end of a ground improvement triple pipe rod and a closing member for appropriately closing one of the following flow paths of the main body. , The upper part of the main body receives a high-pressure water supplied from the rod, and a high-pressure air and individual grout material supplied from the rod.
A bit having two internal and external flow paths outside the center and a drilled water injection hole and a grout material injection hole at the lower end is provided, and the high pressure water flow path and the high pressure air flow path are located above the main body. The grout material flow path is connected to the upper injection hole opened on the side wall, the grout material flow path is connected to the lower injection hole opened on the lower side wall, and the high-pressure water flow path is a first extension flow path extending downward in the main body. It is connected to the drilling water injection hole of the lower end bit via a through hole, and a receiving portion of a closing member is provided in the middle of the first extension flow path, which is appropriately dropped into the flow path. Is connected to the grout material injection hole of the lower end bit through a second extension flow path extending downward in the main body, and an opening / closing valve is provided in the middle of the second extension flow path. Normally, it keeps the closed state, and when it receives water pressure from the high-pressure water flow path side, it operates and keeps the open state. That is configured to according tip device triple tube rod for soil improvement to said.
実施例 以下に本考案の一実施例を添付図面にもとづき説明する
と次の通りである。Embodiment An embodiment of the present invention will be described below with reference to the accompanying drawings.
図に於いて、（１）は地盤改良用の三重管ロッド（ａ）
の下端に接続される先端装置本体であって、該本体
（１）は上記ロッド（ａ）の中心流路（ａ１）より高圧
水の供給を受ける中心流路（２）と、同ロッド（ａ）の
内外２本の同心状流路（ａ２）（ａ３）より、高圧エア
及びグラウト材例えばセメントミルクの供給を受ける同
心状の内外２本の流路（３），（４）が形成されてい
る。尚図では内側を高圧エア流路（３）、外側をグラウ
ト材流路（４）となした場合を示したが、この逆であっ
てもよい。In the figure, (1) is a triple pipe rod for ground improvement (a)
A main body (1) connected to the lower end of the rod (a), wherein the main body (1) receives a high-pressure water from the central flow passage (a 1 ) of the rod (a), From the two inner and outer concentric flow channels (a 2 ) and (a 3 ), there are two concentric inner and outer flow channels (3) and (4) that are supplied with high-pressure air and a grout material such as cement milk. Has been formed. In the figure, the inside is the high pressure air flow path (3) and the outside is the grout material flow path (4), but the reverse is also possible.
更に上記本体（１）の下端には、中心を境として左右２
個、都合４個の削孔水噴孔（５ａ）…と、中心にグラウ
ト材噴孔（５ｂ）を有するビット（５）が備えられる。
噴孔（５ａ）…（５ｂ）は図示のように直列状に設けら
れていてもよいし、或は上部噴孔（６）にみられるよう
に同心状に設けられていてもよい。ビット（５）として
本体（１）より大径のものが示されているが、本体
（１）と同形のものであってもよい。Further, at the lower end of the main body (1), there are two
A bit (5) having a single hole, water hole (5a) ..., and a grout material hole (5b) in the center is provided.
The injection holes (5a) ... (5b) may be provided in series as shown, or may be provided concentrically as seen in the upper injection holes (6). Although the bit (5) has a larger diameter than the main body (1), it may have the same shape as the main body (1).
本体（１）の上部の三本の流路のうち中心の高圧水流路
（２）及びこれより外側の高圧エア流路（３）は、本体
（１）の側壁上部に開口された内外２重構成の上部噴孔
（６）に個別に接続され、常法通り高圧水は内側噴孔
（６ａ）、高圧エア外側噴孔（６ｂ）より噴射されるよ
うな構成になっている。また最外側のグラウト材流路
（４）は、本体（１）の下部側壁に開口された下部噴孔
（７）に接続されている。The central high-pressure water flow path (2) and the high-pressure air flow path (3) outside the main flow path among the three flow paths in the upper part of the main body (1) are double inside and outside opened on the upper side wall of the main body (1). The high pressure water is individually connected to the upper injection hole (6) of the structure, and the high pressure water is injected from the inner injection hole (6a) and the high pressure air outer injection hole (6b) in the usual manner. Further, the outermost grout material flow path (4) is connected to a lower injection hole (7) opened in a lower side wall of the main body (1).
中心の高圧水流路（２）は本体（１）内を下方へ延長さ
れた第１延長流路（２ａ）を介して、下端ビット（５）
の削孔水噴孔（５ａ）…に接続され、第１延長流路（２
ａ）の途中には、段落ち部（８）が形成されている。こ
の段落ち部（８）は、高圧水流路（２）をその延長部に
於て適宜閉塞するために、該流路（２）内に落し込まれ
る閉塞部材（９）例えば鋼球を受止するためのものであ
り、段落ち部（８）に代え適宜の受止め手段を採用でき
る。また閉塞部材（９）の形状を受止め手段によって適
宜決定すればよく、例えば火格子状の受止め手段を採用
する場合には、円盤状のものでもよい。The high pressure water channel (2) at the center has a lower end bit (5) through a first extension channel (2a) extending downward in the body (1).
Of the first extension flow path (2).
A step drop portion (8) is formed in the middle of a). The step-down part (8) receives a closing member (9), for example, a steel ball, which is dropped into the flow path (2) in order to appropriately close the high pressure water flow path (2) at its extension. In place of the step-down portion (8), an appropriate receiving means can be adopted. Further, the shape of the closing member (9) may be appropriately determined by the receiving means, and for example, when the grate-like receiving means is adopted, it may be a disc shape.
最外側のグラウト材流路（４）は、本体（１）内を下方
へ延長された第２延長流路（４ａ）を介して下端ビット
（５）のグラウト材噴孔（５ｂ）に接続される。第１及
び第２延長流路（２ａ），（４ａ）の噴孔（５ａ）（５
ｂ）への接続は、液溜め（１０ａ）（１０ｂ）を介して
行うことが好ましい。尚液溜め（１０ａ）は環状に形成
されている。The outermost grout material flow path (4) is connected to the grout material injection hole (5b) of the lower end bit (5) through a second extension flow path (4a) extending downward in the main body (1). It The injection holes (5a) (5) of the first and second extension flow paths (2a), (4a)
The connection to b) is preferably made via the liquid reservoirs (10a) (10b). The liquid reservoir (10a) is formed in an annular shape.
第２延長流路（４ａ）の途中に、該流路（４ａ）を適宜
開閉するための開閉弁（１１）が備えられる。開閉弁
（１１）は通常は保持バネ（１２）により閉状態を保持
するが、第１延長流路（２ａ）の分岐部（２ａ１）より
高圧水の水圧を受けると、保持バネ（１２）に抗して下
動し、開状態を保持するような構成になっている。An on-off valve (11) for appropriately opening and closing the flow path (4a) is provided in the middle of the second extension flow path (4a). The on-off valve (11) normally holds the closed state by the holding spring (12), but when receiving the water pressure of the high pressure water from the branch portion (2a 1 ) of the first extension flow path (2a), the holding spring (12). It is constructed so that it moves downward against and keeps the open state.
第１図は弁（１１）の閉状態を示し、閉状態即ち上動位
置にある時は、第２延長流路（４ａ）の途中に設けられ
た接続口（４ａ１）（４ａ２）をその下部の大径部（１
１ａ）に於て遮断するが、水圧を受けて下動すると、上
部の小径部（１１ｂ）が接続口（４ａ１）（４ａ２）と
一致し、小径部（１１ｂ）周囲の周隙（１１ｂ１）を通
じて接続口（４ａ１）（４ａ２）を連結し、流路（４
ａ）を開放する。開状態の状況が第２図に示されてい
る。FIG. 1 shows the closed state of the valve (11), and when the valve is in the closed state, that is, in the upward movement position, the connection ports (4a 1 ) (4a 2 ) provided in the middle of the second extension flow path (4a) are opened. Large diameter part (1
1a), but when moving downward due to water pressure, the upper small diameter portion (11b) coincides with the connection ports (4a 1 ) (4a 2 ) and the circumferential gap (11b) around the small diameter portion (11b). 1 ) to connect the connection ports (4a 1 ) (4a 2 ) and
Open a). The open situation is shown in FIG.
本考案による先端装置に於ては、三重管ロッド（ａ）の
地盤内への建込み時には、高圧水流路（２）及びこれに
付属する第１延長流路（２ａ）は、閉塞部材（９）の閉
塞から解放されており、全長に亘って開通されている。In the tip device according to the present invention, when the triple pipe rod (a) is installed in the ground, the high pressure water flow path (2) and the first extension flow path (2a) attached thereto are closed by the closing member (9). ) Is released from the blockage and is opened over the entire length.
而してこの第１図に示す状態で高圧水を三重管ロッド
（ａ）の流路（ａ１）よりこれに接続する先端装置本体
（１）の中心の流路（２）に供給すると、高圧水は、流
路（２）及びその延長流路（２ａ）から、これに接続す
る噴孔（５ａ）を通って下端ビット（５）の下方へ削孔
水として噴射される。When high-pressure water is supplied from the channel (a 1 ) of the triple pipe rod (a) to the central channel (2) of the tip device main body (1) connected thereto in the state shown in FIG. 1, The high-pressure water is jetted as drilling water from the flow channel (2) and its extension flow channel (2a) through the injection holes (5a) connected to the flow channel (2) and below the lower end bit (5).
よってこのような削孔水による削孔案内と下端ビット
（５）による切削案内とにより、三重管ロッド（ａ）を
地盤内の所定深度まで挿入して行くことができる。Therefore, the triple pipe rod (a) can be inserted to a predetermined depth in the ground by the drilling guide by the drilling water and the cutting guide by the lower end bit (5).
このような削孔操作中には、高圧水の一部が上部噴孔
（６）より噴出される。この噴射水に流路（３）よりの
高圧エアを添わせるようにすれば周囲の地盤を切削で
き、ロッド（ａ）の周囲に、地盤改良操作時に必要なス
ライムの排出通路を形成できる。このような排出通路を
形成するために、図示のように下端ビット（５）の径
を、ロッド（ａ）より大径としておいてもよい。下端ビ
ット（５）を大径とする場合には、高圧エアの供給は省
略してもよい。During such drilling operation, a part of the high pressure water is ejected from the upper injection hole (6). If the high-pressure air from the flow path (3) is added to this jet water, the surrounding ground can be cut, and a slime discharge passage necessary for the ground improvement operation can be formed around the rod (a). In order to form such a discharge passage, the diameter of the lower end bit (5) may be set larger than that of the rod (a) as shown. When the lower end bit (5) has a large diameter, the supply of high pressure air may be omitted.
上記の削孔操作中においては、グラウト材流路（４）の
延長流路（４ａ）に備えた開閉弁（１１）が、削孔水と
して利用される高圧水の水圧を受けて下動し、第２図に
示されるようにグラウト材の延長流路（４ａ）を開放す
るので、上記ロッド（ａ）の最外流路（ａ３）を通じ
て、その下端に接続する流路（４），（４ａ）にグラウ
ト材例えばセメントミルク、セメントベントナイトなど
を供給することにより、下端ビット（５）の噴孔（５
ｂ）よりグラウト材を噴射できる。噴出されたグラウト
材は削孔後に於ける孔壁を安定化する働きをし、このよ
うなグラウト材の噴出は、特に崩壊し易い砂レキ層や滞
水層等を対する削孔時に有用である。尚グラウト材の一
部は、下部噴孔（７）より噴射されるが、このグラウト
材はロッド（ａ）の側壁を伝って削孔により生ずる泥水
と共に地上に排出されるので、特に問題はない。During the above boring operation, the on-off valve (11) provided in the extension flow path (4a) of the grout material flow path (4) moves downward by receiving the water pressure of the high pressure water used as boring water. As shown in FIG. 2, since the extension flow channel (4a) of the grout material is opened, the flow channels (4), () connected to the lower end of the rod (a) through the outermost flow channel (a 3 ). By supplying grout material such as cement milk or cement bentonite to 4a), the injection hole (5) of the lower end bit (5) is
The grout material can be jetted from b). The spouted grout material acts to stabilize the hole wall after drilling, and such spouting of grout material is particularly useful when drilling a sand gravel layer or an aquifer, which tends to collapse. . A part of the grout material is jetted from the lower injection hole (7), but this grout material is transmitted along the side wall of the rod (a) and discharged to the ground along with the muddy water generated by the drilling, so there is no particular problem. .
このようにして地盤内に先端装置の削孔案内で所定深度
まで三重管ロッド（ａ）を挿入した後は、該ロッド
（ａ）の中心流路（ａ１）を通じて、これに接続する先
端装置の中心流路（２）内に閉塞部材（９）を落し込
み、該部材（９）を第１図に破線で示されるように段落
ち部（８）に受止させる。In this way, after the triple pipe rod (a) is inserted into the ground by the drilling guide of the tip device to a predetermined depth, the tip device is connected to this through the central channel (a 1 ) of the rod (a). The closing member (9) is dropped into the central flow path (2) of the device and the member (9) is received by the step-down portion (8) as shown by a broken line in FIG.
段落ち部（８）に受止された閉塞部材（９）は、高圧水
流路の延長流路（２ａ）を閉じ、またこの延長流路（４
ａ）閉により弁（１１）が高圧水より解放され、保持バ
ネ（１２）の働きで閉位置に自動復元し、よってグラウ
ト材の延長流路（４ａ）も閉じられる。The closing member (9) received by the step-down portion (8) closes the extension flow path (2a) of the high-pressure water flow path, and the extension flow path (4).
a) When closed, the valve (11) is released from the high-pressure water, and the holding spring (12) automatically restores the closed position, so that the extension channel (4a) of the grout material is also closed.
而して先端装置は通常の先端装置と実質的に同一の構造
となり、常法通り、三重管ロッドによる地盤改良を実施
できる。Thus, the tip device has substantially the same structure as the ordinary tip device, and the ground can be improved by the triple pipe rod in the usual manner.
効果 このように本考案先端装置は削孔機能を保持するので、
従来装置にみられるような三重管ロッド建込みのための
削孔やケーシングチューブの引抜きなどの予備的な作業
は一切不要となり、三重管ロッドによる地盤改良を施工
能率よく実施できる特徴を有する。更に改良地盤の土質
などによって、削孔水単独による削孔と、削孔水６及び
グラウト材併用の削孔の使い分けができ、便利である。Effect In this way, since the tip device of the present invention retains the drilling function,
It does not require any preparatory work such as drilling for the triple pipe rod installation and pulling out the casing tube as seen in the conventional device, and has the feature that the ground improvement by the triple pipe rod can be carried out efficiently. Further, depending on the soil quality of the improved ground, it is convenient to use the drilling water alone and the drilling water 6 and the grout material in combination.
第１図は本考案の一実施例を示す縦断面図、第２図は開
閉弁の開時の状態を示す部分断面図、第３図は下面図で
ある。 図において、（１）は先端装置本体、（２），（３）及
び（４）は流路、（５）は下端ビット、（６）は上部噴
孔、（７）は下部噴孔、（８）は段落ち部、（９）は閉
塞部材、（１０ａ）（１０ｂ）は液溜め部、（１１）は
開閉弁、（１２）は保持バネである。FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention, FIG. 2 is a partial cross-sectional view showing a state when the on-off valve is open, and FIG. 3 is a bottom view. In the figure, (1) is the tip device body, (2), (3) and (4) are flow paths, (5) is a lower end bit, (6) is an upper injection hole, (7) is a lower injection hole, ( 8) is a step-down portion, 9 is a closing member, 10a and 10b are liquid reservoirs, 11 is an opening / closing valve, and 12 is a holding spring.
Claims (1)
る先端装置本体と、該本体の下記流路の一つを適宜閉じ
る閉塞部材との組合せ構造を有し、上記本体は上部に、
上記ロッドより高圧水の供給を受ける中心流路と、同ロ
ッドより高圧エア及びグラウト材の個別供給を受ける、
中心より外側の内外２本の流路を有していると共に下端
に、削孔水噴孔及びグラウト材噴孔を有するビットを具
備し、上記高圧水流路及び高圧エア流路は上記本体の上
部側壁に開口された上部噴孔に、またグラウト材流路は
下部側壁に開口された下部噴孔に接続され、更に高圧水
流路は、上記本体内を下方へ延長された第１延長流路を
介して下端ビットの削孔水噴孔に接続されていると共
に、第１延長流路の途中に、該流路内に適宜落し込まれ
る閉塞部材の受止部が設けられ、更にグラウト材流路は
本体内を下方へ延長された第２延長流路を介して上記下
端ビットのグラウト材噴孔に接続されていると共に、第
２延長流路の途中に開閉弁が備えられ、該開閉弁は通常
は閉状態を保持し、高圧水流路側よりの水圧を受けると
作動して開状態を保持するよう構成されていることを特
徴とするの地盤改良用三重管ロッドの先端装置。1. A combination structure of a tip device main body connected to a lower end of a ground improvement triple pipe rod and a closing member for appropriately closing one of the following flow paths of the main body, wherein the main body is provided at an upper portion,
A central flow path that receives the supply of high-pressure water from the rod, and an individual supply of high-pressure air and grout material from the rod.
A bit having two internal and external flow paths outside the center and a drilled water injection hole and a grout material injection hole at the lower end is provided, and the high pressure water flow path and the high pressure air flow path are located above the main body. The grout material flow path is connected to the upper injection hole opened on the side wall, the grout material flow path is connected to the lower injection hole opened on the lower side wall, and the high-pressure water flow path is a first extension flow path extending downward in the main body. It is connected to the drilling water injection hole of the lower end bit via a through hole, and a receiving portion of a closing member is provided in the middle of the first extension flow path, which is appropriately dropped into the flow path. Is connected to the grout material injection hole of the lower end bit through a second extension flow path extending downward in the main body, and an opening / closing valve is provided in the middle of the second extension flow path. Normally, it keeps the closed state, and when it receives water pressure from the high-pressure water flow path side, it operates and keeps the open state. Soil improvement for triple pipe rod tip device to, characterized in that it is configured to.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19962487U JPH061621Y2 (en) | 1987-12-28 | 1987-12-28 | Triple tube rod tip device for ground improvement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19962487U JPH061621Y2 (en) | 1987-12-28 | 1987-12-28 | Triple tube rod tip device for ground improvement |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01156230U JPH01156230U (en) | 1989-10-26 |
| JPH061621Y2 true JPH061621Y2 (en) | 1994-01-12 |
Family
ID=31490068
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19962487U Expired - Lifetime JPH061621Y2 (en) | 1987-12-28 | 1987-12-28 | Triple tube rod tip device for ground improvement |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH061621Y2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5250729B2 (en) * | 2008-04-06 | 2013-07-31 | 前田建設工業株式会社 | Underground consolidated body construction method and underground solid body creation device for creating a solid body using the method |
| JP6942001B2 (en) * | 2017-08-03 | 2021-09-29 | 株式会社不動テトラ | High pressure injection device |
| CN110258543B (en) * | 2019-06-20 | 2024-04-19 | 浙江省送变电工程有限公司 | Cement mixing pile guniting hole device capable of being opened and closed automatically |
-
1987
- 1987-12-28 JP JP19962487U patent/JPH061621Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01156230U (en) | 1989-10-26 |
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