JPH0565712A - Borer - Google Patents
BorerInfo
- Publication number
- JPH0565712A JPH0565712A JP22898191A JP22898191A JPH0565712A JP H0565712 A JPH0565712 A JP H0565712A JP 22898191 A JP22898191 A JP 22898191A JP 22898191 A JP22898191 A JP 22898191A JP H0565712 A JPH0565712 A JP H0565712A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- tip
- bit
- pipe
- tip bit
- 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)
- Earth Drilling (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、被改良地盤にスリーブ
バイプ建込み用孔をケーシング掘りするための削孔装置
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drilling device for casing digging a sleeve-vip building hole in an improved ground.
【０００２】[0002]
【従来技術とその問題点】スリーブ注入による地盤改良
工法は既に多くの施工実績を残しており、その施工工程
を概略的に示すと、図５の通りである。図５において、
左から順に、ケーシングａによるボーリング工程、シー
ルグラウトｂの充填工程、スリーブパイプ（外管）ｃの
設置工程、ケーシングａの引抜き工程、クラッキングと
水押し工程及びグラウト注入工程を示し、クラッキング
と水押し及びグラウト注入には、インジェクションパイ
プ（内管）ｄが適用される。2. Description of the Prior Art The ground improvement method by sleeve injection has already made many construction results, and its construction process is schematically shown in FIG. In FIG.
From left to right, the boring process using the casing a, the filling process of the seal grout b, the installing process of the sleeve pipe (outer pipe) c, the drawing process of the casing a, the cracking and water pressing process, and the grout injection process are shown in order from the left. The injection pipe (inner pipe) d is applied to the grout injection.
【０００３】このようなスリーブ注入工法を被圧水下で
の施工に適用する場合、ケージング継ぎ足し作業時に於
ける既設ケーシング管口よりの湧き水防止対策が必要に
なる。When such a sleeve pouring method is applied to construction under pressured water, it is necessary to take measures to prevent spring water from spouting from the existing casing pipe at the time of caging addition work.
【０００４】本発明はこのような湧き水防止対策が万全
で、しかもケーシング掘りによるボーリングを安全確実
に達成し得るような削孔装置を提供しようとするもので
ある。The present invention intends to provide a hole drilling device which can take such measures against spouting water perfectly and can achieve boring by digging a casing in a safe and reliable manner.
【０００５】[0005]
【問題点を解決するための手段】本発明は、薬液注入に
より改良される被改良地盤にスリーブパイプ建込み用孔
をケーシング掘りするための装置であって、ケーシング
と、該ケーシングの先端に挿脱自在且つ一体回転可能に
挿着された先端ビットとを具備し、該先端ビットには先
端に開口する逆止弁付噴口が設けられ、ケーシングと先
端ビット間には、通常はケーシングを先端ビットに対し
抜止め状態に保持し、必要時にはケーシング内へのスリ
ーブパイプの挿入設置をキーとして、ケーシングを上記
抜止め状態から解放するストッパー機構が備えられてい
ることを特徴とする削孔装置に係る。SUMMARY OF THE INVENTION The present invention is an apparatus for digging a casing for a sleeve pipe erection hole in a ground to be improved which is improved by injecting a chemical liquid, the device being inserted into a casing and a tip of the casing. A tip bit that is detachably and integrally rotatably inserted, the tip bit is provided with an injection port with a check valve that opens at the tip, and a casing is normally provided between the casing and the tip bit. On the other hand, the present invention relates to a hole drilling device, which is provided with a stopper mechanism that holds the casing in a retaining state and releases the casing from the retaining state with the insertion and installation of the sleeve pipe into the casing as a key when necessary. ..
【０００６】[0006]
【実施例】以下に本発明の一実施例を添附図面にもとづ
き説明すると、次の通りである。本発明削孔装置は、図
１に示すようにケーシング１と、該ケーシング１の先端
に、挿脱自在に挿着された先端ビット２とを備えてい
る。An embodiment of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the hole drilling device of the present invention includes a casing 1 and a tip bit 2 that is removably inserted into the tip of the casing 1.
【０００７】先端ビット２は基端側に中空管状の差込み
部２１を有し、該差込み部２１はケーシング１の先端部
内に略々摺り合せ状に挿着可能な外径を有している。The tip bit 2 has a hollow tubular insertion portion 21 on the base end side, and the insertion portion 21 has an outer diameter capable of being inserted into the tip portion of the casing 1 in a substantially sliding manner.
【０００８】挿着状態において、ケーシング１を先端ビ
ット２に回止めするために、図４に概略的に示すよう
に、該ビット２の差込み部２１の外周面に係止突部２２
が、またケーシング１の先端部の内周面に上記係止突部
２２に対し軸方向から係脱される係止溝１２が、それぞ
れ、例えば１８０°の間隔で２ヶ所に形成されている。
先端ビット２は図１に示すようにケーシング１を通じて
供給される削孔水を地盤に向け噴出するための噴口２３
（図４では省略されている）を有し、該噴口２３には、
被圧水の逆流を防止するための逆止弁２４が保持バネ２
５と共に備えられている。In order to fix the casing 1 to the tip bit 2 in the inserted state, as shown schematically in FIG. 4, a locking projection 22 is provided on the outer peripheral surface of the insertion portion 21 of the bit 2.
However, on the inner peripheral surface of the tip portion of the casing 1, there are formed two engaging grooves 12 which are engaged with and disengaged from the engaging projections 22 in the axial direction, respectively, at intervals of, for example, 180 °.
As shown in FIG. 1, the tip bit 2 is an injection port 23 for ejecting drilling water supplied through the casing 1 toward the ground.
(Not shown in FIG. 4), the nozzle 23 has
The check valve 24 for preventing the backflow of the pressurized water is the holding spring 2
It is equipped with 5.
【０００９】ケーシング１と先端ビット２との間には、
通常はケーシング１を先端ビット２に対し抜止め状態に
保持し、必要時には、ケーシング１内へのスリープパイ
プ３の挿入設置をキーとして抜止め状態より解放するス
トッパー機構４が備えられている。Between the casing 1 and the tip bit 2,
Normally, a stopper mechanism 4 is provided which holds the casing 1 in a state where it is prevented from being pulled out from the tip bit 2, and when necessary, uses the insertion and installation of the sleep pipe 3 in the casing 1 as a key to release it from the state where it is pulled out.
【００１０】ストッパ機構４は、先端ビット２の差込み
部２１に設けられた孔４１内に出没自在に装入されたボ
ール４２と、差込み部２１内に軸方向に移動可能に装入
された筒子４３とを構成要素として含み、筒子４３は上
記孔４１と一致する閉位置と、上記孔４１より先端側に
ずれる開位置とを選択的にとり得るよう構成されてい
て、通常は保持バネ４４と位置規制ストッパ４５とによ
り閉位置に保持されている。The stopper mechanism 4 includes a ball 42 inserted into and retractable from a hole 41 provided in the insertion portion 21 of the tip bit 2, and a cylinder inserted into the insertion portion 21 so as to be movable in the axial direction. 43 as a component, the cylinder 43 is configured so as to selectively take a closed position that coincides with the hole 41 and an open position that is displaced to the tip side from the hole 41. It is held in the closed position by the restriction stopper 45.
【００１１】図１に示すように、筒子４３が閉位置にあ
るときは、筒子４３はボール４２の下端を受止するの
で、ボール４２は外方へ突出して、ケーシング１の先端
部内周面の半球状凹部４６に係止し、ケーシング１を抜
止めする。As shown in FIG. 1, when the cylinder 43 is in the closed position, the cylinder 43 receives the lower end of the ball 42, so that the ball 42 projects outward and the inner peripheral surface of the tip portion of the casing 1 is covered. It is locked in the hemispherical recess 46 to prevent the casing 1 from coming off.
【００１２】一方図２に示すようにケーシング１内にス
リーブパイプ３を挿入設置し、この挿入設置で該パイプ
３の先端を介し筒子４３を保持バネ４４に抗し先端方の
開位置まで押動すると、ボール４２は筒子４３による受
止から解放されて、孔４１内に没入可能となり、よって
ケーシング１は抜止め状態から解放され、先端ビット２
から切離可能な状態となる。On the other hand, as shown in FIG. 2, the sleeve pipe 3 is inserted and installed in the casing 1, and by this insertion and installation, the cylinder 43 is pushed through the tip of the pipe 3 against the holding spring 44 to the open position toward the tip. Then, the ball 42 is released from being received by the tube 43 and can be retracted into the hole 41, so that the casing 1 is released from the retaining state and the tip bit 2 is released.
It becomes possible to disconnect from.
【００１３】筒子４３は開位置に於ては、スリーブパイ
プ３の先端部と差込み部２１との間に、ボール４２の孔
４１内没入に必要な周隙４７を形成することが必要であ
る。この目的のために、スリープパイプ３の先端部３１
は、差込み部２１の内径よりも、径が細くなっている。In the open position of the cylinder 43, it is necessary to form a circumferential gap 47 between the tip end of the sleeve pipe 3 and the insertion portion 21, which is necessary for the ball 42 to be retracted into the hole 41. For this purpose, the tip 31 of the sleep pipe 3 is
Has a diameter smaller than the inner diameter of the insertion portion 21.
【００１４】スリーブパイプ３の挿入設置状態に於て
は、該パイプ３は保持バネ４４のバネ力を受けてケーシ
ングパイプ１内より押し出される傾向となる。この押し
出し傾向に対抗するために、スリープパイプ３の先端細
径部３１に後続する部分の外周面にねじ部３２を形成
し、該ねじ部３２を、差込み部２１の基端部の内周面に
形成したねじ部２３に螺合するような構成にすることが
できる。また先端ビット２への螺合接続でスリープパイ
プ３は挿入設置状態を安定確実に保持できる。When the sleeve pipe 3 is inserted and installed, the pipe 3 tends to be pushed out of the casing pipe 1 by the spring force of the holding spring 44. In order to counteract this pushing tendency, a threaded portion 32 is formed on the outer peripheral surface of the portion of the sleep pipe 3 subsequent to the tip small diameter portion 31, and the threaded portion 32 is formed on the inner peripheral surface of the base end portion of the insertion portion 21. It can be configured to be screwed into the screw portion 23 formed in the above. Further, the sleep pipe 3 can be stably and reliably held in the inserted and installed state by being screwed to the tip bit 2.
【００１５】図１は削孔形成作業時の状況を示し、ケー
シング１の先端に先端ビット２が挿着され、またストッ
パー機構４は、ケーシング１を先端ビット２に対し抜止
めしている。この図１に示す状態でケーシング１に削孔
水を供給しつつ回転を与えることにより、先端ビット２
並びに該ビット２の噴口２３より噴出される削孔水との
削孔案内で、被改良地盤に所定深度の削孔を形成するこ
とができる。尚図１には便宜的にスリープパイプ３が示
されているが、削孔作業時には、ケーシング１内には、
スリーブパイプ３は存在しない。FIG. 1 shows a situation at the time of forming a hole. A tip bit 2 is attached to the tip of a casing 1, and a stopper mechanism 4 holds the casing 1 against the tip bit 2. In the state shown in FIG. 1, by rotating the casing 1 while supplying drilling water, the tip bit 2
In addition, by drilling guide with the drilling water ejected from the nozzle 23 of the bit 2, it is possible to form a hole having a predetermined depth in the improved ground. Although the sleep pipe 3 is shown in FIG. 1 for convenience, during the drilling work, the inside of the casing 1 is
The sleeve pipe 3 does not exist.
【００１６】被改良地盤への削孔作業は、所定深度に達
するまで、ケーシング１を継ぎ足しながら行なわれる
が、先端ビット２の噴口２３には逆止弁２４が備えられ
ているので、仮に被圧水下での施工であっても被圧水が
噴口２３を通じケーシング１内に逆流するという虞れが
なくなり、ケーシング１の継ぎ足し作業を湧水の危険性
なしに安全に行い得る。The drilling work on the ground to be improved is carried out while replenishing the casing 1 until a predetermined depth is reached, but since the injection port 23 of the tip bit 2 is provided with a check valve 24, it is temporarily pressed. Even if the construction is performed under water, there is no fear that the water under pressure will flow back into the casing 1 through the injection port 23, and the work of adding the casing 1 can be safely performed without the danger of spring water.
【００１７】また削孔作業はケーシング１を先端ビット
２に対しストッパー機構４を介し抜止めした状態で行な
われるので、ケーシング１の継足し作業時や逆回転作業
など、回転が中断することがあっても、ケーシング１と
先端ビット２との間に自然切離が生ずるという危険性が
なく、先端ビット２を必要時に切離し得る構造であるに
拘わらず、削孔作業を安全確実に遂行できる。Further, since the drilling work is performed in a state where the casing 1 is fixed to the tip bit 2 via the stopper mechanism 4, the rotation of the casing 1 may be interrupted at the time of adding the casing 1 or the reverse rotation work. However, there is no risk of natural separation between the casing 1 and the tip bit 2, and the drilling operation can be safely and reliably performed regardless of the structure that allows the tip bit 2 to be separated when necessary.
【００１８】ケーシング１による削孔作業を終了した後
は、図２に示すようにケーシング１内にスリーブパイプ
３が挿入設置される。このスリーブパイプ３の挿入設置
をキーとして、ストッパー機構４がケーシング１を抜止
め状態から解放し、よってケーシング１は先端ビット２
から切離可能な態勢となる、而して図２に示す状態でケ
ーシング１を引抜くことにより、スリーブパイプ３を挿
入設置位置に、先端ビット２とともに残すことができ
る。先端ビット２は、地盤改良作業終了後は、上記パイ
プ２と共に埋め殺される。After the drilling work by the casing 1 is completed, the sleeve pipe 3 is inserted and installed in the casing 1 as shown in FIG. The stopper mechanism 4 releases the casing 1 from the retaining state by using the insertion and installation of the sleeve pipe 3 as a key.
When the casing 1 is pulled out in the state shown in FIG. 2, the sleeve pipe 3 can be left at the insertion installation position together with the tip bit 2. The tip bit 2 is buried together with the pipe 2 after the ground improvement work is completed.
【００１９】ケーシング１の引抜き作業時におけるケー
シング１内よりの湧き水を防止するために、該ケーシン
グ１の先端部の内周面にシールリング１１が装着されて
いる。このシーリング１１はケーシング１の引抜きにつ
れ、スリーブパイプ３上を摺動し、ケーシング１と上記
パイプ３間の隙間を閉じる。A seal ring 11 is attached to the inner peripheral surface of the tip of the casing 1 in order to prevent spring water from coming out of the casing 1 when the casing 1 is pulled out. As the casing 1 is pulled out, this sealing 11 slides on the sleeve pipe 3 to close the gap between the casing 1 and the pipe 3.
【００２０】ケーシング１を引抜いた後は、挿入設置さ
れたスリーブパイプ３並びに該パイプ３内に挿入される
インジェクションパイプ（図５参照）を利用して、削孔
内へのシールグラウト充填工程及びクラッキングと水押
し工程を経てグラウトの注入による地盤改良が行なわれ
る。After the casing 1 is pulled out, the sleeve pipe 3 inserted and installed and the injection pipe (see FIG. 5) inserted into the pipe 3 are used to fill the seal grout into the drilled hole and cracking. The ground is improved by pouring grout through the water pushing process.
【００２１】[0021]
【効果】本発明削孔装置によれば、先端ビットの噴口に
逆止弁が備えられているので、ケーシングよりの湧き水
防止対策が万全となり、被圧水下でも安全に施工でき
る。[Effect] According to the drilling device of the present invention, since the check valve is provided at the injection port of the tip bit, the measure for preventing the spring water from the casing is perfect, and it can be safely installed even under pressured water.
【００２２】更にケーシングを先端ビットから必要時に
切離し得る構造であるに拘わらず、通常はストッパー機
構の働きで、ケーシングは先端ビットから抜止めされて
いるので、削孔作業に不用意に切離が生ずるという危険
性がなく、作業安全に施工できる。Further, regardless of the structure in which the casing can be separated from the tip bit when necessary, since the casing is usually retained by the stopper bit by the action of the stopper mechanism, the casing is inadvertently separated during drilling work. There is no danger that it will occur, and work can be performed safely.
【図１】本発明の一実施例を示す縦断面図である。FIG. 1 is a vertical sectional view showing an embodiment of the present invention.
【図２】スリープパイプ挿入設置時の状況を示す第１図
に対応する図である。FIG. 2 is a diagram corresponding to FIG. 1 showing a situation when a sleep pipe is inserted and installed.
【図３】ケーシングの引抜き状況を示す第１図に対応す
る図である。FIG. 3 is a view corresponding to FIG. 1 showing a situation of pulling out a casing.
【図４】ケーシングと先端ビットとの接続構造を示す部
分詳細図である。FIG. 4 is a partial detailed view showing a connection structure between a casing and a tip bit.
【図５】従来の地盤改良工法の一例を示す説明図であ
る。FIG. 5 is an explanatory diagram showing an example of a conventional ground improvement method.
１ ケーシング ２ 先端ビット ３ スリーブパイプ ４ ストッパー機構 1 Casing 2 Tip bit 3 Sleeve pipe 4 Stopper mechanism
Claims (1)
スリーブパイプ建込み用孔をケーシング掘りするための
装置であって、ケーシングと、該ケーシングの先端に挿
脱自在且つ一体回転可能に挿着された先端ビットとを具
備し、該先端ビットには先端に開口する逆止弁付噴口が
設けられ、ケーシングと先端ビット間には、通常はケー
シングを先端ビットに対し抜止め状態に保持し、必要時
にはケーシング内へのスリーブパイプの挿入設置をキー
として、ケーシングを上記抜止め状態から解放するスト
ッパー機構が備えられていることを特徴とする削孔装
置。1. A device for digging a casing for a sleeve pipe erection hole in a ground to be improved, which is improved by injecting a chemical liquid, wherein the casing and a tip of the casing are detachably and integrally rotatably attached. The tip bit is provided with a check valve injection port that opens to the tip, and between the casing and the tip bit, the casing is normally held in a state in which it is prevented from coming off from the tip bit, A hole drilling device, comprising a stopper mechanism for releasing the casing from the retaining state when the sleeve pipe is inserted and installed into the casing when necessary.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3228981A JPH07103545B2 (en) | 1991-09-09 | 1991-09-09 | Sleeve pipe installation device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3228981A JPH07103545B2 (en) | 1991-09-09 | 1991-09-09 | Sleeve pipe installation device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0565712A true JPH0565712A (en) | 1993-03-19 |
| JPH07103545B2 JPH07103545B2 (en) | 1995-11-08 |
Family
ID=16884901
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3228981A Expired - Fee Related JPH07103545B2 (en) | 1991-09-09 | 1991-09-09 | Sleeve pipe installation device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07103545B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007016394A (en) * | 2005-07-05 | 2007-01-25 | Koken Boring Mach Co Ltd | Pipe installing construction method and hole drilling device |
| JP2008115612A (en) * | 2006-11-06 | 2008-05-22 | Alloy Kogyo Kk | Drilling tool |
| JP2014125781A (en) * | 2012-12-26 | 2014-07-07 | Ohbayashi Corp | Method for burying outer pipe for chemical injection, and chemical injection method using buried outer pipe |
| JP2017089263A (en) * | 2015-11-11 | 2017-05-25 | 株式会社大阪防水建設社 | Soil sampling method |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5466510A (en) * | 1977-11-04 | 1979-05-29 | Sanshin Kensetsu Kogyo Kk | Method of and device for draining ground |
| JPS54147611A (en) * | 1978-05-12 | 1979-11-19 | Sanshin Kensetsu Kogyo Kk | Method of construction of chemicals injection |
-
1991
- 1991-09-09 JP JP3228981A patent/JPH07103545B2/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5466510A (en) * | 1977-11-04 | 1979-05-29 | Sanshin Kensetsu Kogyo Kk | Method of and device for draining ground |
| JPS54147611A (en) * | 1978-05-12 | 1979-11-19 | Sanshin Kensetsu Kogyo Kk | Method of construction of chemicals injection |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007016394A (en) * | 2005-07-05 | 2007-01-25 | Koken Boring Mach Co Ltd | Pipe installing construction method and hole drilling device |
| JP4738075B2 (en) * | 2005-07-05 | 2011-08-03 | 鉱研工業株式会社 | Pipe installation method and drilling device |
| JP2008115612A (en) * | 2006-11-06 | 2008-05-22 | Alloy Kogyo Kk | Drilling tool |
| JP2014125781A (en) * | 2012-12-26 | 2014-07-07 | Ohbayashi Corp | Method for burying outer pipe for chemical injection, and chemical injection method using buried outer pipe |
| JP2017089263A (en) * | 2015-11-11 | 2017-05-25 | 株式会社大阪防水建設社 | Soil sampling method |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH07103545B2 (en) | 1995-11-08 |
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