JP2957668B2 - Prevention device for spring and sediment inflow when drilling casing in drilling of high spring pressure ground - Google Patents
Prevention device for spring and sediment inflow when drilling casing in drilling of high spring pressure groundInfo
- Publication number
- JP2957668B2 JP2957668B2 JP24863790A JP24863790A JP2957668B2 JP 2957668 B2 JP2957668 B2 JP 2957668B2 JP 24863790 A JP24863790 A JP 24863790A JP 24863790 A JP24863790 A JP 24863790A JP 2957668 B2 JP2957668 B2 JP 2957668B2
- Authority
- JP
- Japan
- Prior art keywords
- casing
- drilling
- spring
- prevention device
- rubber packing
- 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 - Fee Related
Links
Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、高湧水圧地盤の削孔におけるケーシング引
き抜き時の湧水及び土砂流入防止装置に関する。Description: TECHNICAL FIELD The present invention relates to a spring and sediment inflow prevention device at the time of pulling out a casing in drilling a high spring pressure ground.
［従来の技術］ 従来、崩壊性のある高湧水圧地盤における削孔は一般
に、第６図に示すように逆止弁付きビットすなわちクロ
ーネンビット３によるケーシング1Aの打ち込み方法で行
われていた。[Prior Art] Conventionally, drilling in a collapsed high spring pressure ground has generally been performed by a method of driving a casing 1A with a bit with a check valve, that is, a Kronen bit 3, as shown in FIG.
この方法では、所定深度まで削孔したのち、円筒状構
造物（例えば水抜きパイプ、薬液注入パイプ、アンカー
テンドン等）10（第７図）をケーシング1A内に挿入する
までケーシング1A内は、クローネンビット３により完全
に止水されている。In this method, after drilling to a predetermined depth, the inside of the casing 1A is closed until a cylindrical structure (for example, a drain pipe, a chemical injection pipe, an uncurtain don, etc.) 10 (FIG. 7) is inserted into the casing 1A. The water is completely stopped by the bit 3.
しかし、円筒状構造物10を所定の位置に挿入してから
第７図に示すようにケーシング1Aの引き抜きを開始する
と同時に、ケーシング1Aの先端に取付けたクローネンビ
ット３が脱落する。そのため、矢印で示すように湧水と
土砂がケーシング1Aと円筒状構造物10との間の隙間Ａに
流入してボーリング孔Ｂ内を閉塞する。したがって、ケ
ーシング1Aを引き抜き時に円筒状構造物10が供上がりし
たり、ボーリング孔Ｂ内に充填する注入材が完全に注入
できなかったり、あるいはケーシング1Aを引き抜くこと
ができなくなるなどの不具合が発生する。However, as shown in FIG. 7, after the cylindrical structure 10 is inserted into a predetermined position, the pulling out of the casing 1A starts, and at the same time, the kronen bit 3 attached to the tip of the casing 1A falls off. Therefore, as shown by the arrow, spring water and earth and sand flow into the gap A between the casing 1A and the cylindrical structure 10, and block the borehole B. Therefore, problems occur such as the cylindrical structure 10 being lifted when the casing 1A is pulled out, the injection material filling the bore hole B being unable to be completely injected, or the casing 1A being unable to be pulled out. .
一般的に井戸等の噴出防止技術は知られており、例え
ば特公昭60−73994号公報に開示されている。しかしな
がら、かかる公知技術を水抜きパイプや薬液注入パイプ
或いはアンカーテンドン等に適用しようとしても、それ
らのパイプやアンカーテンドンの周囲のケーシングを引
抜くものではないので不適当である。In general, a technique for preventing eruption of wells and the like is known, and is disclosed, for example, in Japanese Patent Publication No. 60-73994. However, it is not appropriate to apply such a known technique to a drain pipe, a chemical injection pipe, an uncurtain don, or the like, since the casing around those pipes or uncurtain don is not pulled out.
［発明が解決しようとする課題］ したがって本発明の目的は、ケーシング引き抜き時に
円筒状構造物が供上がりすることがなく、かつ注入材が
注入不能になることがない高湧水圧地盤の削孔における
湧水及び土砂流入防止装置を提供するにある。[Problems to be Solved by the Invention] Accordingly, an object of the present invention is to provide a drilling method for a high spring pressure ground in which a cylindrical structure is not lifted when a casing is pulled out and an injection material cannot be injected. An object of the present invention is to provide a spring and sediment inflow prevention device.
［課題を解決するための手段］ 本発明によれば、ドライブシューにクローネンビット
が着脱自在に印篭嵌合されているケーシング引き抜き時
の湧水及び土砂流入防止装置において、そのドライブシ
ューのクローネンビットに近い部分の内周に固定リング
半径方向内方に突出して設けられ、その固定リングには
ゴムパッキングが押えリングと取付ボルトで取付けら
れ、そのゴムパッキングは挿入される円筒状構造物の外
径よりも小径の円孔が設けられ、その円孔から延びる放
射状のスリットが形成されている。[Means for Solving the Problems] According to the present invention, in a spring and sediment inflow prevention device at the time of pulling out a casing in which a kronen bit is detachably fitted to a drive shoe, the kronen of the drive shoe is provided. A fixing ring is provided on the inner periphery of the portion close to the bit so as to protrude inward in the radial direction, and a rubber packing is attached to the fixing ring with a holding ring and a mounting bolt, and the rubber packing is provided outside the cylindrical structure to be inserted. A circular hole having a diameter smaller than the diameter is provided, and a radial slit extending from the circular hole is formed.
［作用］ 上記のように構成された湧水及び土砂流入装置におい
ては、所定深度まで削孔したのち、ケーシング円筒状構
造物を挿入し、構造物の先端部をゴムパッキングに挿通
する。これによりケーシングと円筒状構造物との間の隙
間は、ゴムパッキングでシールされる。そこで、ケーシ
ングを引き抜くと、クローネンビットは脱落するが、前
記隙間は円筒状構造物に沿って移動するゴムパッキング
によりシールされ、湧水及び土砂のその隙間への流入が
防止される。[Operation] In the spring and sediment inflow device configured as described above, after drilling to a predetermined depth, the casing cylindrical structure is inserted, and the tip of the structure is inserted into the rubber packing. Thereby, the gap between the casing and the cylindrical structure is sealed with the rubber packing. Then, when the casing is pulled out, the kronen bit falls off, but the gap is sealed by a rubber packing moving along the cylindrical structure, thereby preventing spring water and earth and sand from flowing into the gap.
［実施例］ 以下図面を参照して本発明の実施例を説明する。Embodiment An embodiment of the present invention will be described below with reference to the drawings.
第１図ないし第３図において、全体を符号１で示すケ
ーシングのドライブシュー２には、クローネンビット３
が着脱自在に印篭嵌合されている。In FIGS. 1 to 3, a drive shoe 2 of a casing, generally designated by the reference numeral 1,
Are removably fitted to the seals.
そのドライブシュー２のクローネンビット３に近い部
分の内周には、固定リング４が突設され、そのリング４
には、押えリング５と取付ボルト６とによりシール体で
ある全体を符号７で示すゴムパッキングが取付けられて
いる。A fixing ring 4 is protruded from an inner periphery of the drive shoe 2 near the kronen bit 3, and the ring 4
, A rubber packing indicated by reference numeral 7 as a whole, which is a seal body, is attached by a holding ring 5 and a mounting bolt 6.
このゴムパッキング７には、円筒状構造物である例え
ば水抜きパイプ10の外径より若干小径の円孔８と、複数
（図示の例では12条）の放射状のスリット９とが形成さ
れている。The rubber packing 7 is formed with a circular hole 8 having a diameter slightly smaller than the outer diameter of, for example, a drainage pipe 10 which is a cylindrical structure, and a plurality (12 in the illustrated example) of radial slits 9. .
施工に際し、削孔が完了したら（第３図）、ケーシン
グ１内に水抜きパイプ10を挿入し、その先端部をゴムパ
ッキング７に挿通する（第４図）。したがって、水抜き
パイプ10とケーシング１との間の隙間Ａは、ゴムパッキ
ング７でシールされる。なお、図中の符号11はスリーブ
バルブである。When drilling is completed at the time of construction (FIG. 3), a drain pipe 10 is inserted into the casing 1 and its tip is inserted through the rubber packing 7 (FIG. 4). Therefore, the gap A between the drain pipe 10 and the casing 1 is sealed by the rubber packing 7. Reference numeral 11 in the figure denotes a sleeve valve.
次いで、ケーシング１を矢印の方に引き抜くと（第５
図）、クローネンビット３が脱落し、削孔Ｂ内に矢印ａ
のように湧水、土砂が流入するが、ゴムパッキング７に
より隙間Ａへの流入が防止される。Next, when the casing 1 is pulled out in the direction of the arrow (fifth
(Fig.), Kronen bit 3 falls off, and arrow a
Although the spring water and the earth and sand flow in as described above, the rubber packing 7 prevents the water from flowing into the gap A.
［発明の効果］ 以上の通り、本発明によれば、下記のすぐれた効果を
奏する。[Effects of the Invention] As described above, according to the present invention, the following excellent effects can be obtained.
（ａ） ケーシングの引き抜きに際し、クローネンビッ
トが脱落しても、ゴムパッキングにより湧水や土砂が円
筒構造物とケーシングとの間に流入しない。(A) When the casing is pulled out, even if the kronen bit falls off, spring water and earth and sand do not flow between the cylindrical structure and the casing due to the rubber packing.
（ｂ） したがって円筒状構造物の供上がりや注入材の
注入不良が生じない。(B) Therefore, the rise of the cylindrical structure and the poor injection of the injection material do not occur.
（ｃ） 円筒状構造物の挿入に支障が生ぜず、作業性が
阻害されない。(C) The insertion of the cylindrical structure is not hindered, and the workability is not hindered.
第１図は本発明の一実施例を示す側断面図、第２図は第
１図のＡ矢視図、第３図、第４図及び第５図は施工状態
の削孔完了時、水抜きパイプ挿入時及びケーシング引き
抜き時を示す側断面図、第６図及び第７図は従来方法に
おける削孔完了時及びケーシング引き抜き時の状態を示
す側断面図である。 １……ケーシング、２……ドライブシュー、３……クロ
ーネンビット、７……ゴムパッキングFIG. 1 is a side sectional view showing an embodiment of the present invention, FIG. 2 is a view taken in the direction of arrow A in FIG. 1, and FIGS. FIGS. 6 and 7 are side sectional views showing a state where drilling is completed and a state where the casing is pulled out according to the conventional method when inserting the drawn pipe and when pulling out the casing, respectively. 1 ... casing, 2 ... drive shoe, 3 ... krone bit, 7 ... rubber packing
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭56−41985（ＪＰ，Ａ) 特開 昭63−289115（ＪＰ，Ａ) 特開 昭60−73994（ＪＰ，Ａ) 実開 昭62−143747（ＪＰ，Ｕ) 実開 昭56−87591（ＪＰ，Ｕ) (58)調査した分野(Int.Cl.6，ＤＢ名) E21B 33/10 - 33/1295 ──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-41985 (JP, A) JP-A-63-289115 (JP, A) JP-A-60-73994 (JP, A) 143747 (JP, U) Shokai 56-87591 (JP, U) (58) Fields investigated (Int. Cl. 6 , DB name) E21B 33/10-33/1295
Claims (1)
自在に印篭嵌合されているケーシング引き抜き時の湧水
及び土砂流入防止装置において、そのドライブシューの
クローネンビットに近い部分の内周に固定リングが半径
方向内方に突出して設けられ、その固定リングにはゴム
パッキングが押えリングと取付ボルトで取付けられ、そ
のゴムパッキングは挿入される円筒状構造物の外径より
も小径の円孔が設けられ、その円孔から延びる放射状の
スリットが形成されていることを特徴とする高湧水圧地
盤の削孔におけるケーシング引き抜き時の湧水及び土砂
流入防止装置。In a spring and sediment inflow prevention device at the time of pulling out a casing in which a kronen bit is detachably fitted to a drive shoe, a fixing ring is provided on an inner periphery of a portion near the kronen bit of the drive shoe. Is provided to protrude inward in the radial direction, a rubber packing is attached to the fixing ring with a holding ring and a mounting bolt, and the rubber packing has a circular hole smaller in diameter than the outer diameter of the cylindrical structure to be inserted. And a radial slit extending from the circular hole, wherein a spring and sediment inflow prevention device at the time of pulling out a casing in drilling a high spring pressure ground.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24863790A JP2957668B2 (en) | 1990-09-20 | 1990-09-20 | Prevention device for spring and sediment inflow when drilling casing in drilling of high spring pressure ground |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP24863790A JP2957668B2 (en) | 1990-09-20 | 1990-09-20 | Prevention device for spring and sediment inflow when drilling casing in drilling of high spring pressure ground |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04128492A JPH04128492A (en) | 1992-04-28 |
| JP2957668B2 true JP2957668B2 (en) | 1999-10-06 |
Family
ID=17181074
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP24863790A Expired - Fee Related JP2957668B2 (en) | 1990-09-20 | 1990-09-20 | Prevention device for spring and sediment inflow when drilling casing in drilling of high spring pressure ground |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2957668B2 (en) |
-
1990
- 1990-09-20 JP JP24863790A patent/JP2957668B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04128492A (en) | 1992-04-28 |
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