JPH0457836B2 - - Google Patents
Info
- Publication number
- JPH0457836B2 JPH0457836B2 JP62125533A JP12553387A JPH0457836B2 JP H0457836 B2 JPH0457836 B2 JP H0457836B2 JP 62125533 A JP62125533 A JP 62125533A JP 12553387 A JP12553387 A JP 12553387A JP H0457836 B2 JPH0457836 B2 JP H0457836B2
- Authority
- JP
- Japan
- Prior art keywords
- casing
- head
- groove forming
- forming part
- turning groove
- 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
- 238000005096 rolling process Methods 0.000 claims description 19
- 238000005553 drilling Methods 0.000 claims description 7
- 239000004576 sand Substances 0.000 description 13
- 238000009412 basement excavation Methods 0.000 description 7
- 238000010276 construction Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000007596 consolidation process Methods 0.000 description 4
- 239000003673 groundwater Substances 0.000 description 4
- 239000003638 chemical reducing agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005056 compaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011435 rock Substances 0.000 description 1
- 239000002689 soil Substances 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000011800 void material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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
削孔ケーシング用のヘツドに関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a head for a drilled 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ツプハン
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、ベノト工法などはその一つ
である。
In the construction of cast-in-place piles, an all-casing method is known in which the inside of the casing is excavated with a drilling machine such as a hammer grab or a drop hammer while the casing is being erected, and the Benoto method is one such method.
このベノト工法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、ドロツプハンマー等
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つて、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
悪いばかりでなく、地下水の流速が100m／Ｈ以
上ある地盤にあつてはハンマーグラブによる先行
掘削によつて地盤が崩壊しケーシングの挿入が不
可能となつて掘削できない。たとえ掘削できたと
しても、地下水によつ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
伴つて地盤沈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つた。 This Benoto construction method casing is built into the ground while rocking, but since the casing itself does not have the ability to cut through boulders or bedrock, a drilling machine such as a drop hammer is inserted in advance of the casing to make it easier to dig. The tip of the casing is press-fitted into the casing after it is created, and it is necessary to use a separate hammer grab to eject small pieces of boulder, etc., and it is also necessary to replace the hole-drilling machine, which is extremely inefficient. In the case of ground where the flow rate of groundwater is 100 m/h or more, the ground collapses due to preliminary excavation with a hammer grab, making it impossible to insert the casing and therefore excavation is not possible. Even if the excavation is possible, the ready-mixed concrete will be washed away by groundwater.
Ready-mixed concrete cannot be added. In addition, the preliminary excavation with a hammer grab could cause collapse of the hole wall, which could lead to ground subsidence, which greatly affected 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ツター
ビツトを設け、ケーシングの回転速度、面圧、ビ
ツ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
グラブ等で行なう工法（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 is completely unaffected by the presence or absence of groundwater, and by appropriately selecting the rotational speed of the casing, the surface pressure, and the shape and angle of the bit, the casing itself can cut through rock and boulders. We devised and are implementing a construction method (referred to as the Excel construction method) in which the casing is advanced and the earth and sand is discharged using a hammer grab.
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59−89188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.
No. (Utility Model Publication No. 59-89188), 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 compacted to near the consolidation limit of each stratum using protrusions formed along the entire length of the casing body, thereby creating voids. We proposed a method that reduces the water rate and 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 along the entire length of the casing body, which may cause increased frictional resistance during excavation.
本発明の目的は前記従来例の不都合を解消し、
削孔が行われるケーシング先端部近傍で孔壁を圧
密限界近くまで圧密させて不透水層を効果的に形
成できる削孔ケーシング用のヘツドを提供するこ
とにある。 The purpose of the present invention is to eliminate the disadvantages of the conventional example,
To provide a head for a drilled casing that can effectively form an impermeable layer by consolidating the hole wall close to the consolidation limit near the tip of the casing where the hole is drilled.
本発明は前記目的を達成するため、回転ケーシ
ングの先端に結合する短尺筒体で、その下端面に
カツタービツトを配設した削孔ケーシング用のヘ
ツドにおいて、該ヘツドの外周面に凹部を形成
し、この凹部に突条を設けその間を旋回溝とした
旋回溝形成部を設け、この旋回溝形成部の左右は
この旋回溝形成部の横幅程度の幅で、肉厚でケー
シング本体より僅かに外側に突出する転圧部とし
て形成し、さらに、転圧部は断面形状が、回転方
向に対して先細となる匂玉状に形成してあり、ま
た、前記突条のうちの数個は途中を切断し、砂利
等を逃す横溝を形成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 a head for a drilling casing which is a short cylindrical body connected to the tip of a rotary casing and has a cutter bit disposed on its lower end surface, and a recess is formed on the outer circumferential surface of the head. A turning groove forming part is provided in which a protrusion is provided in this concave part and a turning groove is formed between them, and the left and right sides of this turning groove forming part have a width approximately equal to the width of this turning groove forming part, and the wall thickness is slightly outward from the casing body. The rolling part is formed as a protruding rolling part, and the rolling part has a cross-sectional shape tapered in the direction of rotation, and some of the protrusions are cut in the middle. The main idea is that horizontal grooves were formed to allow gravel, etc. to escape.
本発明によれば、ケーシングを一方向に連続回
転させるとそのヘツドの下端面のカツタービツト
で削られた土砂はヘツ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 continuously rotated in one direction, the earth and sand scraped by the cutter bit on the lower end surface of the head is pushed out to the outside of the head, and some of it is consolidated into the hole wall by the rolling part on the outer peripheral surface. Ru. Also,
The remaining earth and sand are guided by the grooves of the swirling groove forming section and rise, and are compacted onto the hole wall by the rolling compaction section.
さらに、旋回溝形成部の溝に導かれた土砂に混
入する砂利等は突条の横溝で逃すことができる。 Furthermore, gravel and the like mixed in the earth and sand guided into the grooves of the swirl groove forming portion can be released by the lateral grooves of the protrusions.
〔実施例〕
以下、図面について本発明の実施例を詳細に説
明する。[Embodiments] Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
第１図は本発明のヘツドの正面図、第２図はそ
の底面図で、該ヘツド１は短尺筒体からなり、そ
の上端にはケーシング本体２への嵌合継手３を形
成し、下端面にはカツタービツト４を植設する
が、このカツタービツト４の多くはそのテーパー
面がヘツド１の外周に向くように配慮した。 FIG. 1 is a front view of the head of the present invention, and FIG. 2 is a bottom view thereof. The head 1 is made of a short cylindrical body, and a fitting joint 3 to the casing body 2 is formed at the upper end, and the lower end surface A cutter bit 4 is installed in the head 1, and most of the cutter bits 4 are designed so that their tapered surfaces face the outer periphery of the head 1.
ヘツド１の外周面に凹部１８を形成し、この凹
部１８内に突条５を設けその間を旋回溝６とした
旋回溝形成部とする。 A recess 18 is formed on the outer circumferential surface of the head 1, and a protrusion 5 is provided in the recess 18, with a revolving groove 6 formed therebetween to form a revolving groove.
また、該旋回溝形成部の左右はこの旋回溝形成
部の幅と同程度の幅で、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とし、さらに
旋回溝形成部の下部も狭い高さで同様な転圧部７
とした。 In addition, the left and right sides of the turning groove forming part have a width comparable to the width of the turning groove forming part, and have a wall thickness that is similar to the width of the turning groove forming part.
The rolling pressure part 7 is made to protrude slightly outward, and the lower part of the swirl groove forming part is also narrow in height and has a similar rolling pressure part 7.
And so.
このようにしてヘツド１の外周面に旋回溝形成
部と転圧部７を区画形成するが、転圧部７は旋回
溝形成部の左右および下部に位置してこの旋回溝
形成部を囲むものであり、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。 In this way, a swirling groove forming part and a rolling pressure part 7 are defined on the outer circumferential surface of the head 1, and the rolling groove forming part 7 is located on the left, right, and lower sides of the swirling groove forming part and surrounds this swirling groove forming part. In the illustrated example, each pair of swirl groove forming portions and rolling pressure portions 7 are 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
となる匂玉状に形成してあつて、掘削土砂を回転
により外方に押圧出来るようにしてある。 The rolling section 7 has a cross-sectional shape that is tapered in the direction of rotation, so that it can press the excavated earth and sand outward by rotation.
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。 Several of the protrusions 5 are cut in the middle to form lateral grooves 8 through which gravel and the like can escape.
なお、ケーシング２及びヘツド１は内部を中空
とした２重壁体で形成する２重ケーシング構造と
なつており、図示は省略するが内部に送液管を配
し、必要に応じてその端をヘツド１の外周に噴出
ノズル９として臨ませる。 The casing 2 and the head 1 have a double casing structure formed by a double wall with a hollow interior, and although not shown in the drawings, a liquid feeding pipe is arranged inside, and the end of the pipe can be connected as necessary. A jet nozzle 9 is placed on the outer periphery of the head 1.
次に、使用法及び動作について説明する。 Next, usage and operation will be explained.
ヘツド１は、ケーシング本体２へ継手３を介し
て嵌合し、ボルト止めで固定する。 The head 1 is fitted into the casing body 2 via the joint 3 and fixed with bolts.
図中１０はベースマシンであり、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
チヤツク機構１４からなるケーシング駆動部１５
を短尺なリーダマスト１１に上下動自在に取付
け、かつ減速機１３の外側に昇降ジヤツキ１６を
設けている。 In the figure, 10 is a base machine, and a casing drive unit 15 includes a motor 12, a reducer 13, and a casing chuck mechanism 14 rotated by these.
is attached to a short leader mast 11 so as to be movable up and down, and a lifting jack 16 is provided outside the reduction gear 13.
かかるベースマシン１０のケーシング駆動部１
５に、チヤツク機構１４でケーシング本体２の外
周を固定するようにケーシング本体２をセツト
し、モータ１２を始動すれば減速機１３を介して
チヤツク機構１４が回転し、該チヤツク機構１４
で押えられたケーシング本体２及びその先端のヘ
ツド１も一方向にゆつくりと回転する。 Casing drive section 1 of such base machine 10
5, the casing body 2 is set so that the outer periphery of the casing body 2 is fixed by the chuck mechanism 14, and when the motor 12 is started, the chuck mechanism 14 rotates via the reducer 13, and the chuck mechanism 14 is rotated.
The casing main body 2 and the head 1 at its tip also rotate slowly in one direction.
ヘツド１の下端面はカツタービツト４で地盤を
切削し、地盤中へ切込まれてゆく。 The lower end surface of the head 1 is cut into the ground by a cutter bit 4.
このカツタービツト４での切削土砂や石くず
は、ヘツド１の外側へ押し出され、第４図に示す
ようにその一部はヘツド１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に沿つて
上昇しつつ転圧部７によつて孔壁に圧密される。 The earth and sand and stone chips cut by the cutter bit 4 are pushed out to the outside of the head 1, and some of them are compacted into the hole wall by the rolling section 7 of the head 1, as shown in FIG. Further, the remaining earth and sand rises along the swirl groove 6 and is compacted onto the hole wall by the rolling section 7.
このようにしてヘツド１及びケーシング本体２
が地盤に建込まれていくと、自重でケーシング駆
動部１５もリーダマスト１１を下降するが、その
最下位まで達すると、チヤツク機構１４を一度ゆ
るめて昇降ジヤツキ１６を伸して駆動部１５を押
し上げ、再度ケーシング本体２の上部をチヤツク
機構１４で固定して同様の動作を繰返す。 In this way, the head 1 and the casing body 2
As it is built into the ground, the casing drive unit 15 also moves down the leader mast 11 due to its own weight, but when it reaches the lowest point, the chuck mechanism 14 is loosened and the lifting jack 16 is extended to move the drive unit 15 down. Push it up, fix the upper part of the casing body 2 again with the chuck mechanism 14, and repeat the same operation.
一方、ヘツド１内で輪切りにされた土砂はハン
マーグラブ等の掘削機１７をケーシング本体２内
へ上方から吊下し、これで排出する。 On the other hand, the earth and sand cut into rings within the head 1 are discharged by an excavator 17 such as a hammer grab suspended from above within the casing body 2.
以上述べたように、本発明の削孔ケーシング用
のヘツドは、回転ケーシングの先端に結合する短
尺筒体で、その下端面にカツタービツトを配設し
た削孔ケーシング用のヘツドであるから、カツタ
ービツトで切削された土砂の一部はすぐに孔壁に
圧密されて、特に、ボイド率がローム層では約60
〜70％、砂層では約35〜45％、礫層では約25〜35
％であるが本発明のヘツドによれば、各地層の圧
密限界近くまで圧密して、不透水層を形成できる
ものである。また、ケーシング先端部のみで土砂
圧密作用を行うものであるから掘削時の摩擦抵抗
を減じ効率的な削孔を実現できるものである。
As described above, the head for a drilled casing of the present invention is a short cylindrical body that is connected to the tip of a rotating casing, and has a cutter bit disposed on its lower end surface. Some of the excavated earth and sand is immediately consolidated into the hole wall, especially when the void ratio is about 60 in the loam layer.
~70%, about 35-45% in sand layer, about 25-35 in gravel layer
%, but according to the head of the present invention, each layer can be consolidated close to its consolidation limit to form an impermeable layer. In addition, since the soil compaction effect is performed only at the tip of the casing, the frictional resistance during excavation can be reduced and efficient drilling can be achieved.
さらに、土砂の転圧部はケーシングの全長に設
けることなく先端のヘツドにのみあるので、ケー
シングの回転に際して余分な負荷をかけることが
ないものとなる。 Further, since the earth and sand compacting portion is not provided along the entire length of the casing, but only at the head at the tip, no extra load is applied when the casing rotates.
特に、転圧部は旋回溝形成部に横並びに位置
し、転圧部で孔壁に圧密され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さらに転圧部
により孔壁に圧密されるという相互作用が効果的
に得られるものである。 In particular, the rolling section is located side by side with the swirling groove forming section, and the remaining earth and sand consolidated on the hole wall in the rolling section is guided into the groove of the swirling groove forming section and rises, and is further moved by the rolling section to the hole wall. This effectively creates an interaction in which the material is compacted.
第１図は本発明の削孔ケーシング用のヘツドの
正面図、第２図は同上Ａ−Ａ切断断面図、第３図
は建込状態の正面図、第４図は建込時のヘツド部
の正面図である。
１……ヘツド、２……ケーシング本体、３……
嵌合継手、４……カツタービツト、５……突条、
６……旋回溝、７……転圧部、８……横溝、９…
…噴出ノズル、１０……ベースマシン、１１……
リーダマスト、１２……モータ、１３……減速
機、１４……チヤツク機構、１５……駆動部、１
６……昇降ジヤツキ、１７……掘削機、１８……
凹部。
Fig. 1 is a front view of the head for a drilling casing according to the present invention, Fig. 2 is a cross-sectional view taken along the line A-A of the same as above, Fig. 3 is a front view of the head in the built-in state, and Fig. 4 is the head portion when built. FIG. 1...Head, 2...Casing body, 3...
Fitting joint, 4...Cutter bit, 5...Protrusion,
6...Swivel groove, 7...Rolling section, 8...Horizontal groove, 9...
...Blowout nozzle, 10...Base machine, 11...
Leader mast, 12...Motor, 13...Reducer, 14...Chuck mechanism, 15...Drive unit, 1
6... Lifting jack, 17... Excavator, 18...
recess.
Claims (1)
で、その下端面にカツタービツトを配設した削孔
ケーシング用のヘツドにおいて、該ヘツドの外周
面に凹部を形成し、この凹部に突条を設けその間
を旋回溝とした旋回溝形成部を設け、この旋回溝
形成部の左右はこの旋回溝形成部の横幅程度の幅
で、肉厚でケーシング本体より僅かに外側に突出
する転圧部として形成し、さらに、転圧部は断面
形状が回転方向に対して先細となる匂玉状に形成
してあり、また、前記突条のうちの数個は途中を
切断し、砂利等を逃す横溝を形成したことを特徴
とする削孔ケーシング用のヘツド。1. A short cylindrical body that is connected to the tip of a rotating casing, and a head for a drilling casing that has a cutter bit on its lower end surface.A recess is formed on the outer circumferential surface of the head, and a protrusion is provided in the recess to create a space between the two. A turning groove forming part is provided as a turning groove, and the left and right sides of this turning groove forming part are formed as rolling pressure parts having a width approximately equal to the width of the turning groove forming part and having a wall thickness and protruding slightly outward from the casing main body, Further, the rolling section was formed in a cross-sectional shape tapering in the direction of rotation, and some of the protrusions were cut in the middle to form horizontal grooves for letting gravel and the like escape. A head for a drilled casing, which is characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12553387A JPS63289114A (en) | 1987-05-21 | 1987-05-21 | Head for drill casing |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12553387A JPS63289114A (en) | 1987-05-21 | 1987-05-21 | Head for drill casing |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63289114A JPS63289114A (en) | 1988-11-25 |
| JPH0457836B2 true JPH0457836B2 (en) | 1992-09-14 |
Family
ID=14912543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12553387A Granted JPS63289114A (en) | 1987-05-21 | 1987-05-21 | Head for drill casing |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS63289114A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021055273A (en) * | 2019-09-27 | 2021-04-08 | 株式会社オトワコーエイ | Head of boring casing |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH076190B2 (en) * | 1989-02-16 | 1995-01-30 | 株式会社松沢基工 | Pile construction method |
| JP5716055B2 (en) * | 2013-06-21 | 2015-05-13 | 前田建設工業株式会社 | Construction method of ground improvement pile |
| CN108589707A (en) * | 2018-05-14 | 2018-09-28 | 上海腾尚基础工程有限公司 | A kind of full-sleeve long screw auger and churning driven combined type construction |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627486B2 (en) * | 1980-06-18 | 1987-02-17 | Matsushita Electric Ind Co Ltd |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989186U (en) * | 1982-12-06 | 1984-06-16 | 株式会社長谷川工務店 | drilling shaft |
| JPS5989188U (en) * | 1982-12-08 | 1984-06-16 | 株式会社松沢基工 | drilling casing |
| JPS59116490U (en) * | 1983-01-24 | 1984-08-06 | 株式会社長谷川工務店 | Earth Ogre |
| JPH0240151Y2 (en) * | 1985-06-28 | 1990-10-26 |
-
1987
- 1987-05-21 JP JP12553387A patent/JPS63289114A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS627486B2 (en) * | 1980-06-18 | 1987-02-17 | Matsushita Electric Ind Co Ltd |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2021055273A (en) * | 2019-09-27 | 2021-04-08 | 株式会社オトワコーエイ | Head of boring casing |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63289114A (en) | 1988-11-25 |
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