JPH0384115A - Excavated casing - Google Patents
Excavated casingInfo
- Publication number
- JPH0384115A JPH0384115A JP21997689A JP21997689A JPH0384115A JP H0384115 A JPH0384115 A JP H0384115A JP 21997689 A JP21997689 A JP 21997689A JP 21997689 A JP21997689 A JP 21997689A JP H0384115 A JPH0384115 A JP H0384115A
- Authority
- JP
- Japan
- Prior art keywords
- casing
- casings
- normal
- cutting head
- peripheral surface
- 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
- 230000002093 peripheral effect Effects 0.000 claims abstract description 7
- 238000005096 rolling process Methods 0.000 claims description 24
- 238000009412 basement excavation Methods 0.000 claims description 15
- 238000005056 compaction Methods 0.000 abstract description 7
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004576 sand Substances 0.000 description 15
- 238000005553 drilling Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 239000011800 void material Substances 0.000 description 4
- 238000010276 construction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 239000003638 chemical reducing agent Substances 0.000 description 2
- 230000003028 elevating effect Effects 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
Landscapes
- Earth Drilling (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、大口径の場所打杭を施工するための掘削ケー
シングに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an excavation casing for constructing large diameter cast-in-place piles.
場所打杭の施工において、ケーシングを建込みながらそ
の内部をハンマーグラブやドロップハンマー等の削孔機
で掘削していくオールケーシング工法が知られており、
ベノトエ法などはその一つである。In the construction of cast-in-place piles, the all-casing method is known, in which the inside of the casing is excavated with a drilling machine such as a hammer grab or drop hammer while the casing is being erected.
The Benotoe method is one of them.
このベノトエ法はケーシングを揺動しながら地盤に建込
むが、ケーシング自体には転石や岩盤などを削り割る能
力がないため、ドロップハンマー等の削孔機をケーシン
グに先行させて挿入し、掘りやすい状態を作り出してか
らケーシング先端をそこへ圧入していくものであって、
小割した転石等の排出に別途ハンマーグラブを使用する
などの削孔機の交換なども必要となり、作業性がきわめ
て悪いだけでなく、地下水の流速が100m/H以上あ
る地盤にあってはハンマーグラブによる先行掘削によっ
て地盤が崩壊しケーシングの挿入が不可能となって掘削
できない。たとえ掘削できたとしても、地下水によって
生コンが流失するため、生コンの投入が出来ない、また
、ハンマーグラブによる先行掘削により孔壁の崩壊がお
き、これに伴って地盤地下を招く恐れがあるなどの理由
で地下水の有無に大きく左右されるものであった。In this Benotoe method, the casing is erected into the ground by shaking it, but since the casing itself does not have the ability to cut and crack boulders or bedrock, a drilling machine such as a drop hammer is inserted in advance of the casing, making it easier to dig. After creating the condition, the tip of the casing is press-fitted into it.
It is necessary to replace the drilling machine, such as using a separate hammer grab to discharge small pieces of boulders, etc. Not only is the workability extremely poor, but it is also necessary to use a hammer in ground where the groundwater flow rate is over 100 m/h. Preliminary excavation with a grab caused the ground to collapse, making it impossible to insert the casing, making it impossible to excavate. Even if excavation is possible, ready-mixed concrete cannot be poured in because it will be washed away by groundwater.Additionally, preliminary excavation using a hammer grab may cause the hole wall to collapse, which may lead to underground formation. For this reason, it was highly dependent on the presence or absence of groundwater.
そこで、発明者は地下水の有無に全く左右されない掘削
方法としてケーシングの先端にカッタービットを設け、
ケーシングの回転速度、面圧、ビットの形状や角度を適
宜選定することでケーシング自体に岩盤や転石を切れる
能力を与え、このケーシングを先行させながら土砂の排
出をハンマーグラブ等で行う工法(エクセル工法と称す
)を考え出して実施している。Therefore, the inventor installed a cutter bit at the tip of the casing as an excavation method that was completely unaffected by the presence or absence of groundwater.
By appropriately selecting the casing's rotational speed, surface pressure, bit shape and angle, the casing itself has the ability to cut through rock and boulders, and this construction method uses a hammer grab, etc., to discharge earth and sand while the casing is in front. ) has been devised and implemented.
このような工法で一番重要なポイントは、該ケーシング
周面の地層をいかにして不透水層に形成するかにあり、
先に本発明者は実願昭57−185595号(実開昭5
9−89188号公報)としてケーシング先端で掘削し
た土砂をケーシング外周へと押出し、これをケーシング
本体全長に形成した突起条により外周地盤を各地層の圧
密限界近くまで圧密してボイド率を低減し、不透水層を
形成するものを提案した。The most important point in this construction method is how to form the stratum around the casing into an impermeable layer.
Previously, the present inventor filed Utility Application No. 57-185595
9-89188), the earth and sand excavated at the tip of the casing is pushed out to the outer periphery of the casing, and the outer ground is consolidated to near the consolidation limit of each stratum using protrusions formed along the entire length of the casing body, reducing the void ratio. We proposed a method that forms an impermeable layer.
しかし、この実願昭57−185595号のものでは圧
密壁はケーシング本体の長さ方向の全体で形成されるも
のであり、掘削時の摩擦抵抗を大きくする原因にもなる
ことがある。However, in this Japanese Utility Model Application No. 57-185595, the consolidation wall is formed over the entire length of the casing body, which may cause increased frictional resistance during excavation.
そこで、本発明者は特願昭62−125533号〈特開
昭63−289114号公報)でケーシングの先端に嵌
合しボルト止めで固定するカッティングヘッドとして、
下端面にカッタービットを配設し、外周面を上下方向の
旋回溝形成部と肉厚な転圧部とに区画したものを提案し
た。Therefore, the present inventor proposed a cutting head that fits into the tip of the casing and is fixed with bolts in Japanese Patent Application No. 62-125533 (Japanese Unexamined Patent Publication No. 63-289114).
We have proposed a structure in which a cutter bit is disposed on the lower end surface, and the outer circumferential surface is divided into a vertical turning groove forming section and a thick rolling section.
このカッティングヘッドによれば、ケーシングを回転さ
せながら建込む時に、そのヘッドの下端面のカッタービ
ットで削られた土砂はヘッドの外側に押出され一部はそ
の外周面の転圧部で孔壁に圧密される。また、残りの土
砂は旋回溝形成部の溝に導かれて上昇しつつ転圧部によ
り孔壁に圧密される。According to this cutting head, when the casing is rotated and erected, the earth and sand scraped by the cutter bit on the lower end of the head is pushed out to the outside of the head, and some of it is pressed against the hole wall by the rolling part on the outer circumferential surface. Consolidated. In addition, the remaining earth and sand are guided by the grooves of the swirl groove forming part and rise, and are consolidated on the hole wall by the rolling part.
このように孔壁が圧密されることで、ケーシング周面の
摩擦が除去される。By compacting the hole wall in this way, friction on the casing circumferential surface is eliminated.
前記特願昭62−125533号のカッティングヘッド
はケーシング全体が比較的短い時はかなり有効なもので
あるが、大深度の掘削を行うために、多数のケーシング
を長さ方向に継ぎ足して全体に長いケーシングとなる時
は該カッティングヘッドで圧密形成された孔壁が劣化し
て所望の効果が期待できないおそれがある。The cutting head disclosed in Japanese Patent Application No. 62-125533 is quite effective when the entire casing is relatively short, but in order to perform deep excavation, a large number of casings are added in the length direction to make the entire casing longer. When forming a casing, there is a risk that the hole wall compacted by the cutting head may deteriorate and the desired effect may not be expected.
本発明の目的は前記従来例の不都合を解消し、大深度の
掘削でも充分孔壁を圧密させて不透水層を効果的に形成
できる掘削ケーシングを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide an excavation casing which eliminates the disadvantages of the conventional examples and which can sufficiently consolidate the hole wall and effectively form an impermeable layer even when excavating at great depths.
本発明は前記目的を達成するため、回転可能な通常ケー
シングを長さ方向に複数接続する場合に、その接続の適
宜個所に、外周面に上下方向の旋回溝と肉厚な転圧部と
を設け、上下端に通常ケーシングへの嵌合継手を形成し
た接続用短尺ケーシングを介在させ、また、接続された
通常ケーシングの最下端に外周面を上下方向の旋回溝形
成部と肉厚な転圧部とに区画し、上端に通常ケーシング
への嵌合継手を設け、下端面にカッタービットを有する
短尺ケーシングのカッティングヘッドを配設したことを
要旨とするものである。In order to achieve the above object, the present invention provides vertical turning grooves and thick rolling sections on the outer circumferential surface at appropriate locations of the connections when a plurality of rotatable normal casings are connected in the longitudinal direction. A short connecting casing with a fitting joint to the normal casing is interposed at the upper and lower ends, and a thick rolling groove is formed on the outer peripheral surface of the connected normal casing at the bottom end with a vertical turning groove forming part. The gist is that the casing is divided into two parts, a fitting joint to the normal casing is provided at the upper end, and a cutting head of a short casing having a cutter bit is provided at the lower end.
本発明によれば、ケーシングを回転させながら建込む時
に、そのカッティングヘッドの下端面のカッタービット
で削られた土砂はヘッドの外側に押出され一部はその外
周面の転圧部で孔壁に圧密される。また、残りの土砂は
旋回溝形成部の溝に導かれて上昇しつつ転圧部により孔
壁に圧密される。According to the present invention, when the casing is rotated and erected, the earth and sand scraped by the cutter bit on the lower end of the cutting head is pushed out to the outside of the head, and some of the earth and sand is pressed against the hole wall by the rolling part on the outer circumferential surface. Consolidated. In addition, the remaining earth and sand are guided by the grooves of the swirl groove forming part and rise, and are consolidated on the hole wall by the rolling part.
このように先ずカッチ゛イングヘッドで孔壁が圧密され
ることで、ケーシング周面の摩擦が除去される。In this way, the cutting head first consolidates the hole wall, thereby eliminating friction on the casing peripheral surface.
一方、掘削とともにケーシング全体が地盤中に建込まれ
ていき、前記カッティングヘッドでの圧密個所はケーシ
ングの中間部に移行し劣化して崩れを生じる。On the other hand, as the casing is excavated, the entire casing is erected into the ground, and the compacted area at the cutting head moves to the middle part of the casing, where it deteriorates and collapses.
これに対して、接続用短尺ケーシングがある部分がその
場所にくると前記カッティングヘッドと同様に、崩れた
土砂は旋回溝でケーシングの外側に押出され一部はその
外周面の転圧部で孔壁に圧密され、また残りの土砂は旋
回溝形成部の溝に導かれて上昇しつつ転圧部により孔壁
に圧密され、再度孔壁の補強がなされ、以下同様にその
上方の接続用短尺ケーシングでも孔壁の補強がなされ、
大深度の掘削孔でもその全長に圧密壁が確実に得られる
。On the other hand, when the part with the short connecting casing comes to that location, the collapsed soil is pushed out to the outside of the casing by the swirl groove, and some of it is pierced by the rolling part on the outer circumferential surface, similar to the cutting head. The remaining earth and sand are guided into the grooves of the swirl groove forming section and rise up, compacted against the hole wall by the rolling compaction section, reinforcing the hole wall again, and in the same way, the remaining earth and sand are introduced into the grooves of the swirling groove forming section, and are compacted onto the hole wall. The hole walls of the casing are also reinforced,
A consolidated wall can be reliably obtained throughout the entire length of a deep excavation hole.
以下、図面について本発明の実施例を詳細に説明する。 Embodiments of the present invention will be described in detail below with reference to the drawings.
第1図は本発明の掘削ケーシングの1実施例を示す1部
切欠いた正面図で、図中2は鋼管による通常ケーシング
でこれは長さ方向に複数接続する。FIG. 1 is a partially cutaway front view showing one embodiment of the excavation casing of the present invention. In the figure, 2 is a normal casing made of steel pipes, which are connected in plural in the length direction.
このように通常ケーシング2を複数接続するに際し、本
発明は接続用短尺ケーシング18を2本または3本おき
の接続個所に介在させる。When connecting a plurality of normal casings 2 in this manner, the present invention interposes short connecting casings 18 at every second or third connection point.
この接続用短尺ケーシング18は、第2図、第3図に示
すように、上下端に前記通常ケーシング2への雄型嵌合
継手19aと雌型嵌合継手19bとを設け、外周面を上
下方向の旋回溝20と肉厚な転圧部21とに区画したも
のである。図中22は嵌合継手19a+19bに形成し
たボルト孔を示す。As shown in FIGS. 2 and 3, this short casing 18 for connection is provided with a male fitting joint 19a and a female fitting joint 19b to the normal casing 2 at the upper and lower ends, and the outer peripheral surface is connected to the upper and lower ends. It is divided into a turning groove 20 in the direction and a thick rolling part 21. In the figure, 22 indicates bolt holes formed in the fitting joints 19a+19b.
接続用短尺ケーシング18は前記転圧部21以外の部分
では通常ケーシング2外径と同一の外径であり、転圧部
21はこれを肉厚とすることで通常ケーシング2より僅
かに外側に突出させ、かつ端縁をテーパーに形成する。The connecting short casing 18 has the same outer diameter as the normal casing 2 except for the rolling part 21, and the rolling part 21 is made thicker so that it protrudes slightly outward from the normal casing 2. and the edges are tapered.
また、旋回溝20は矩形な転圧部21を上下方向で間隔
を置いて形成することで該転圧部21間に同時に形成さ
れる。Furthermore, the swirl grooves 20 are simultaneously formed between the rectangular rolling portions 21 by forming them at intervals in the vertical direction.
さらに、転圧部21は短尺ケーシング18の周面方向で
も間隔を置いて形成し、その間に前記旋回溝20と交差
する縦溝23が設けられるようにした。Further, the rolling portions 21 are formed at intervals in the circumferential direction of the short casing 18, and a vertical groove 23 intersecting with the swirl groove 20 is provided between them.
このようにして通常ケーシング2のうち、2本または3
本おきではこの接続用短尺ケーシング18を用いて接続
し、他は通常の接続をおこなうが、該接続用短尺ケーシ
ング18の配置や転圧部21の形状等は掘削の深度や地
層の状態に応じて適宜選択できる。In this way, two or three of the normal casings 2 are
In this case, this connection short casing 18 is used for connection, and other connections are made normally, but the arrangement of the connection short casing 18 and the shape of the compaction part 21 etc. depend on the depth of excavation and the condition of the strata. You can select as appropriate.
さらに、接続されたケーシング2の先端にはカッティン
グヘッド1を嵌合しボルト止めで固定する。Further, the cutting head 1 is fitted to the tip of the connected casing 2 and fixed with bolts.
第4図に示すように該カッティングへラド1は上端に通
常ケーシング2への嵌合継手3を形成し、下端面にはカ
ッタービット4を植設したもので、外周面は凹部に突条
5を設けその間を旋回溝6とした旋回溝形成部と肉厚で
ケーシング本体2より僅かに外側に突出する転圧部7と
に区画形成するが、図示の例ではこの旋回溝形成部と転
圧部7とはそれぞれ一対ずつ対向するように形成した。As shown in FIG. 4, the cutting blade 1 has a fitting joint 3 for a normal casing 2 at its upper end, a cutter bit 4 is implanted at its lower end, and a protrusion 5 in a recess on its outer circumferential surface. It is divided into a swirl groove forming part with a swirl groove 6 between them and a rolling part 7 which is thick and slightly protrudes outward from the casing body 2. In the illustrated example, this swirl groove forming part and rolling A pair of portions 7 were formed to face each other.
転圧部7は断面形状が、回転方向に対して先細となる勾
玉状に形成してテーパー面7aを有するものとし、この
テーパー面7aを介して掘削土砂を回転により外方に押
圧出来るようにしである。The rolling section 7 has a cross-sectional shape that is tapered in the direction of rotation and has a tapered surface 7a, so that the excavated soil can be pressed outward by rotation through this tapered surface 7a. It is.
前記突条5のうちの数個は途中を切断し、砂利等を逃す
横−溝8を形成する。Some of the protrusions 5 are cut in the middle to form horizontal grooves 8 through which gravel and the like can escape.
次に、使用法について説明する。Next, how to use it will be explained.
第5図は使用状態を示すもので、図中10はケーシング
建込み機であり、モータ12と減速機13及びこれらに
より回転するケーシングチャック機構14からなるケー
シング駆動部15を昇降ジヤツキ16によりリーグマス
ト11を介して昇降自在に支承する。FIG. 5 shows the state of use, and 10 in the figure is a casing erection machine, in which a casing driving unit 15 consisting of a motor 12, a reducer 13, and a casing chuck mechanism 14 rotated by these is moved to a league mast by an elevating jack 16. 11 so that it can be raised and lowered freely.
なお、このケーシング建込み機10は移動機構をもつベ
ースマシンタイプでなく、据え置きタイプで、昇降ジヤ
ツキ16を脚とするものでもよい。Note that this casing erection machine 10 is not a base machine type having a moving mechanism, but may be a stationary type, and may be of a stationary type, and the lifting jack 16 is used as a leg.
前記ケーシング建込み機14のケーシング駆動部15に
、チャック機構14でケーシング2等の外周を固定する
ようにケーシング2等をセットし、モータ12を始動す
れば減速機13を介してチャック機構14が回転し、該
チャック機構14で押えられたケーシング2や接続用短
尺ケーシング18及びその先端のカッティングヘッド1
も一方向にゆっくりと回転する。When the casing 2 etc. are set in the casing drive section 15 of the casing erecting machine 14 so that the outer periphery of the casing 2 etc. is fixed by the chuck mechanism 14, and the motor 12 is started, the chuck mechanism 14 is moved through the reducer 13. The rotating casing 2 held by the chuck mechanism 14, the connecting short casing 18, and the cutting head 1 at its tip.
It also rotates slowly in one direction.
先端のカッタービット4での切削土砂や石くずは、ヘッ
ド1の外側へ押し出され、その一部はヘッドlの転圧部
7で孔壁に圧密される。また残りの土砂等は旋回溝6に
沿って上昇しつつ転圧部7によって孔壁に圧密される。The dirt and stone chips cut by the cutter bit 4 at the tip are pushed out to the outside of the head 1, and some of them are compacted into the hole wall by the rolling part 7 of the head 1. Further, the remaining earth and sand rises along the swirl groove 6 and is compacted onto the hole wall by the rolling section 7.
昇降ジヤツキ16はフリーとなっており、このようにし
てヘッド1及びケーシング2等が地盤に建込まれていく
と、自重でケーシング駆動部15も下降するが、その最
下位まで達すると、チャック機構を一度ゆるめて昇降ジ
ヤツキ16を伸ばして駆動部15を押し上げ、再度ケー
シング2等の上部をチャック機構14で固定して同様の
動作を繰返す。The lifting jack 16 is free, and as the head 1, casing 2, etc. are built into the ground in this way, the casing drive unit 15 also descends due to its own weight, but when it reaches the lowest position, the chuck mechanism is loosened once, the lifting jack 16 is extended to push up the drive unit 15, and the upper part of the casing 2 etc. is fixed again with the chuck mechanism 14, and the same operation is repeated.
一方、ヘッド1内で輪切りにされた土砂はハンマーグラ
ブや他の掘削パケット等の掘削機17をケーシング2等
内へ上方から吊下し、これで掘削、排土する。On the other hand, an excavator 17 such as a hammer grab or other excavation packet is suspended from above into the casing 2 to excavate and remove the earth and sand cut into rings within the head 1.
前記孔壁の圧密についてさらに説明すると、カッティン
グヘッドlは、ケーシング2等の先端に結合するもので
あるから、カッタービット4で切削された土砂の一部は
すぐに孔壁に圧密される。To further explain the consolidation of the hole wall, since the cutting head 1 is connected to the tip of the casing 2, etc., a portion of the earth and sand cut by the cutter bit 4 is immediately consolidated into the hole wall.
通常、ボイド率はローム層では約60〜70%、砂層で
は約35〜45%、礫層では約25〜35%であるがカ
ッティングヘッド1によれば、各地層の圧密限界近くま
で圧密して、ボイド率を下げ不透水層を形成できるもの
である。Normally, the void ratio is about 60 to 70% for loam layers, about 35 to 45% for sand layers, and about 25 to 35% for gravel layers, but according to cutting head 1, each layer is consolidated close to the consolidation limit. , which can lower the void ratio and form an impermeable layer.
一方、掘削とともにケーシング全体が地盤中に建込まれ
ていき、前記カッティングヘッド1での圧密個所はケー
シングの中間部に移行し、ケーシング2と擦れ合うなど
すると劣化して崩れを生じる。On the other hand, as the casing is being excavated, the entire casing is erected into the ground, and the consolidated part of the cutting head 1 moves to the middle part of the casing, and when it rubs against the casing 2, it deteriorates and collapses.
これに対して、接続用短尺ケーシング18がある部分が
その場所にくると、前記カッティングへラド1と同様に
、崩れた土砂は旋回溝20でケーシング18の外側に押
出され、一部はその外周面の転圧部21で再度孔壁に圧
密される。また、残りの土砂は旋回溝20に導かれて上
昇しつつ転圧部21により孔壁に圧密され、土のボイド
率を下げて孔壁の補強がなされる。On the other hand, when the part of the short connecting casing 18 comes to that location, the collapsed earth and sand are pushed out of the casing 18 by the turning groove 20, similar to the cutting gear 1, and a part of it is pushed out around the outer periphery. It is again consolidated into the hole wall at the surface rolling part 21. Further, the remaining earth and sand are guided into the swirl groove 20 and ascend, and are compacted onto the hole wall by the rolling compaction section 21, thereby reducing the void ratio of the soil and reinforcing the hole wall.
以下同様にその上方の接続用短尺ケーシング18でも孔
壁の補強がなされ、このように何段階かに分けて2重、
3重に孔壁を圧密することで、大深度の掘削孔でもその
全長にわたり圧密壁が確実に得られる。Similarly, the hole wall is reinforced in the short connection casing 18 above it, and in this way, it is divided into several stages, double layered,
By consolidating the hole wall in three layers, a consolidated wall can be reliably obtained over the entire length of the hole, even in a deep excavation hole.
以上述べたように本発明の掘削ケーシングは、回転可能
な通常ケーシングを長さ方向に複数接続するような大深
度の掘削孔を形成する場合でも、該掘削孔の全長にわた
り孔壁を確実に圧密することで孔壁の崩壊を完全に防止
できるとともに、ケーシング周面の摩擦が除去され、ま
た不透水層が形成できるので地下水の流速が速いところ
でも場所打ち杭の施工が可能となるものである。As described above, the drilling casing of the present invention reliably consolidates the hole wall over the entire length of the drilling hole, even when forming a deep drilling hole in which multiple rotatable regular casings are connected longitudinally. This completely prevents the collapse of the hole wall, eliminates friction on the casing surface, and forms an impermeable layer, making it possible to construct cast-in-place piles even in areas where underground water flows quickly. .
第1図は本発明の掘削ケーシングの1実施例を示す一部
切欠いた正面図、第2図は接続用短尺ケーシングの側面
図、第3図は同上横断平面図、第4図はカッティングヘ
ッドの側面図、第5図は使用状態を示す側面図である。
1・・・カッティングヘッド
2・・・通常ケーシング
3・・・嵌合継手
5・・・突条
7・・・転圧部
8・・・横溝
10・・・ケーシング建込み機
11・・・リーグマスト 12・・・モータ13・・
・減速l1114・・・チャック機構4・・・カッター
ビット
6・・・旋回溝
7a・・・テーパー面
15・・・ケーシング駆動部
16・・・昇降ジヤツキ 17・・・掘削機18・・
・接続用短尺ケーシングFig. 1 is a partially cutaway front view showing one embodiment of the excavation casing of the present invention, Fig. 2 is a side view of a short casing for connection, Fig. 3 is a cross-sectional plan view of the same, and Fig. 4 is a view of the cutting head. Side view, FIG. 5 is a side view showing the state of use. 1... Cutting head 2... Normal casing 3... Fitting joint 5... Projection 7... Rolling section 8... Lateral groove 10... Casing erecting machine 11... League Mast 12...Motor 13...
・Deceleration l1114...Chuck mechanism 4...Cutter bit 6...Swivel groove 7a...Tapered surface 15...Casing drive unit 16...Elevating jack 17...Excavator 18...
・Short casing for connection
Claims (1)
合に、その接続の適宜個所に、外周面に上下方向の旋回
溝と肉厚な転圧部とを設け、上下端に通常ケーシングへ
の嵌合継手を形成した接続用短尺ケーシングを介在させ
、また、接続された通常ケーシングの最下端に、外周面
を上下方向の旋回溝形成部と肉厚な転圧部とに区画し、
上端に通常ケーシングへの嵌合継手を設け、下端面にカ
ッタービットを有する短尺ケーシングのカッティングヘ
ッドを配設したことを特徴とする掘削ケーシング。When connecting multiple rotatable normal casings in the length direction, vertical turning grooves and thick rolling parts are provided on the outer peripheral surface at appropriate locations of the connections, and the upper and lower ends are fitted with the normal casings. A short connecting casing formed with a joint is interposed, and the outer circumferential surface is divided into a vertical swirl groove forming part and a thick rolling part at the lowest end of the connected normal casing,
An excavation casing characterized by having a fitting joint for a regular casing at its upper end and a short casing cutting head having a cutter bit at its lower end.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1219976A JPH0613767B2 (en) | 1989-08-25 | 1989-08-25 | Drilling casing |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1219976A JPH0613767B2 (en) | 1989-08-25 | 1989-08-25 | Drilling casing |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0384115A true JPH0384115A (en) | 1991-04-09 |
JPH0613767B2 JPH0613767B2 (en) | 1994-02-23 |
Family
ID=16743977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1219976A Expired - Lifetime JPH0613767B2 (en) | 1989-08-25 | 1989-08-25 | Drilling casing |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0613767B2 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015140512A (en) * | 2014-01-27 | 2015-08-03 | 株式会社技研製作所 | casing bit |
CN111927334A (en) * | 2020-07-28 | 2020-11-13 | 山东省路桥集团有限公司 | Integrated construction device and construction method for reinforcing existing pile foundation based on slurry control |
CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63194994U (en) * | 1987-05-29 | 1988-12-15 | ||
JPS6443695A (en) * | 1987-08-07 | 1989-02-15 | Sun Tech Inc | Casing expansion joint device in excavator |
-
1989
- 1989-08-25 JP JP1219976A patent/JPH0613767B2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS63194994U (en) * | 1987-05-29 | 1988-12-15 | ||
JPS6443695A (en) * | 1987-08-07 | 1989-02-15 | Sun Tech Inc | Casing expansion joint device in excavator |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2015140512A (en) * | 2014-01-27 | 2015-08-03 | 株式会社技研製作所 | casing bit |
CN111927334A (en) * | 2020-07-28 | 2020-11-13 | 山东省路桥集团有限公司 | Integrated construction device and construction method for reinforcing existing pile foundation based on slurry control |
CN113309080A (en) * | 2021-04-19 | 2021-08-27 | 中铁十九局集团第三工程有限公司 | Construction method of double-casing cast-in-situ bored pile |
Also Published As
Publication number | Publication date |
---|---|
JPH0613767B2 (en) | 1994-02-23 |
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