JPH03212506A - Auger for constructing soil cement synthetic pile - Google Patents
Auger for constructing soil cement synthetic pileInfo
- Publication number
- JPH03212506A JPH03212506A JP706490A JP706490A JPH03212506A JP H03212506 A JPH03212506 A JP H03212506A JP 706490 A JP706490 A JP 706490A JP 706490 A JP706490 A JP 706490A JP H03212506 A JPH03212506 A JP H03212506A
- Authority
- JP
- Japan
- Prior art keywords
- auger
- movable blade
- blade
- support member
- movable
- 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
- 239000004568 cement Substances 0.000 title claims abstract description 66
- 239000002689 soil Substances 0.000 title claims abstract description 44
- 238000003756 stirring Methods 0.000 claims abstract description 29
- 239000002131 composite material Substances 0.000 claims description 21
- 238000009412 basement excavation Methods 0.000 claims description 16
- 238000010276 construction Methods 0.000 claims description 13
- 238000013019 agitation Methods 0.000 claims description 12
- 239000000463 material Substances 0.000 abstract description 10
- 238000005520 cutting process Methods 0.000 abstract description 7
- 238000002347 injection Methods 0.000 description 6
- 239000007924 injection Substances 0.000 description 6
- 238000004898 kneading Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000000034 method Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- 238000003466 welding Methods 0.000 description 3
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 239000008267 milk Substances 0.000 description 2
- 210000004080 milk Anatomy 0.000 description 2
- 235000013336 milk Nutrition 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004567 concrete Substances 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 238000003825 pressing Methods 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
- Earth Drilling (AREA)
- Consolidation Of Soil By Introduction Of Solidifying Substances Into Soil (AREA)
- Piles And Underground Anchors (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、建設関係の基礎工事に適用されるソイルセ
メント合成杭の造成に使用するオーガーに関するもので
ある。[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an auger used for creating soil-cement composite piles applied to construction-related foundation work.
ソイルセメント合成杭の造成方法の一例として、特開昭
64−48926号公報により開示された方法が知られ
ている。この方法は、鋼管、コンクリート管等の中空管
内に貫通させたオーガーロッドの先端部に、拡開した状
態が中空管の外径より大きな外径であるオーガー刃を設
はセメントミルク等の注入材を地中に注入しながら、そ
のオーガー刃の回転により土と強制攪拌することにより
、中空管の外径より大きな外径のソイルセメント柱を造
成しつつ、同時に中空管をその中空管の自重あるいは圧
入力によりソイルセメント柱に埋め込み、ソイルセメン
ト合成杭造成後は、オーガー刃を縮退させ、オーガーヘ
ッドを中空管内を通して引き上げて工事を終了するソイ
ルセメント合成杭造成法である。As an example of a method for constructing a soil-cement composite pile, a method disclosed in Japanese Patent Application Laid-Open No. 64-48926 is known. In this method, an auger blade that has an outer diameter larger than the outer diameter of the hollow tube when expanded is installed at the tip of an auger rod that penetrates a hollow pipe such as a steel pipe or concrete pipe. By injecting the material into the ground and forcibly stirring it with the soil through the rotation of the auger blade, a soil cement column with an outer diameter larger than the outer diameter of the hollow pipe is created, and at the same time, the hollow pipe is This is a soil-cement composite pile construction method in which the pipe is embedded in a soil-cement pillar using its own weight or pressure force, and after construction of the soil-cement composite pile, the auger blade is retracted and the auger head is pulled up through the hollow pipe to complete the construction.
従来、このようなソイルセメント合成杭造成法に使用す
るオーガーとしては、固定刃と可動刃とを有し、可動刃
については、オーガーロッドの回転力および地盤の抵抗
力を利用して拡開縮退させる構造のオーガー(−例とし
て特開昭55−23247号公報参照)、オーガーロッ
ドの軸力および地盤の抵抗力を利用して拡開縮退させる
構造のオーガー(−例として特開昭57127016号
公報参照)、オーガーに、軸力。Conventionally, the auger used in this soil-cement composite pile construction method has a fixed blade and a movable blade, and the movable blade expands and contracts using the rotational force of the auger rod and the resistance of the ground. an auger with a structure that expands and retracts using the axial force of the auger rod and the resistance force of the ground (see Japanese Patent Laid-Open No. 57127016 as an example). ), axial force on the auger.
回転力あるいは地盤の抵抗力の代りに、地上からの指示
による機械力あるいは油圧力を与えて、可動刃を拡開縮
退させるように構成したオーガー等が知られている。Augers and the like are known in which a movable blade is expanded and retracted by applying mechanical or hydraulic pressure in response to instructions from the ground instead of rotational force or ground resistance.
然るに、地盤の抵抗力を利用して可動刃を拡開縮退させ
るオーガーにおいては、可動刃取付部の目詰まり、地中
の障害物等により、地盤の抵抗力を十分に利用できない
場合、地上において可動刃が計画どおり拡開しているか
否かを確認できないという問題があった。However, with an auger that expands and retracts the movable blade using the resistance of the ground, if the resistance of the ground cannot be fully utilized due to clogging of the movable blade mounting part, obstructions underground, etc. There was a problem in that it was not possible to confirm whether the movable blade was expanding as planned.
またソイルセメント合成杭の施工においては、掘削能力
、推進能力の向上のため、オーガーヘッド先端にスクリ
ューヘッドを取付け、地中の深部の支持層では、支持力
に見合う高強度ソイルセメントを造成するために、練り
返しを行なう、前記スクリューヘッドは螺旋状になって
おり、スクリューヘッドにより支持層の地盤を乱さない
ようにするため、オーガーヘッドを引き上げながら練り
返しをする時には、オーガーロッドによりオーガーヘッ
ドおよびスクリューヘッドを逆転させる。In addition, when constructing soil-cement composite piles, a screw head is attached to the tip of the auger head to improve excavation and propulsion capabilities, and in the support layer deep underground, a high-strength soil cement commensurate with the bearing capacity is created. The screw head has a spiral shape, and in order to prevent the screw head from disturbing the ground of the supporting layer, when kneading is performed while pulling up the auger head, the auger rod is used to move the auger head and Reverse the screw head.
このような場合、オーガーロッドの回転力および地盤の
抵抗力を利用して可動刃を拡開させる構造のオーガーヘ
ッドを使用したときは、オーガーロフトによりオーガー
ヘッドを逆転させると、可動刃が縮退するため、土と注
入材との攪拌が不十分となり、そのため高強度のソイル
セメントを造成できないばかりでなく、ソイルセメント
の品質のばらつきが増大するという問題があった。In such cases, when using an auger head that uses the rotating force of the auger rod and the resistance force of the ground to expand the movable blade, the movable blade will retract when the auger head is reversed using the auger loft. As a result, the soil and the injection material are not sufficiently stirred, which not only makes it impossible to create high-strength soil cement, but also increases the variation in quality of the soil cement.
またオーガーロッドの軸力および地盤の抵抗力を利用し
て可動刃を拡開させる構造のオーガーヘッドを使用した
ときも、オーガーヘッドを引き上げた際に、可動刃が縮
退するため、同様な問題があった。Also, when using an auger head that uses the axial force of the auger rod and the resistance force of the ground to expand the movable blade, the same problem occurs because the movable blade retracts when the auger head is pulled up. there were.
一方、地上からの指示による機械力あるいは油圧力を利
用して可動刃を拡開させる構造のオーガーを使用した場
合は、理論上、正確な拡開縮退が得られるが、セメント
ミルク等の注入材はオーガーロフトの内空間を利用して
オーガーヘッドの先端部に供給されるため、地上からの
指示による機械力あるいは油圧力を伝達する装置をオー
ガーロッド内に組み込むと、オーガーロッドが大径化す
ると共に、その構造が複雑化し、そのためオーガーロッ
ドが高価になると共に、その゛重量が増大して施工性が
悪くなり、粗雑な扱いをすると故障し易いという問題が
あるばかりでなく、例えば20Mを越えるような長尺の
中空管を使用する場合は、オーガーロフトの継ぎ足しが
必要となるため、接続部の機構が複雑になるばかりでな
く、セメントミルク等の注入材の侵入により、オーガー
ロッドの接続部において故障を生じる恐れがあった。On the other hand, when using an auger whose movable blades are expanded using mechanical or hydraulic pressure given instructions from the ground, theoretically accurate expansion and retraction can be obtained; is supplied to the tip of the auger head using the internal space of the auger loft, so if a device that transmits mechanical or hydraulic pressure from the ground is incorporated into the auger rod, the diameter of the auger rod will increase. At the same time, the structure becomes complicated, which makes the auger rod expensive, increases its weight, impairs workability, and tends to break down if handled roughly. When using a long hollow tube like this, it is necessary to add an auger loft, which not only complicates the connection mechanism, but also prevents the auger rod connection from entering due to cement milk or other injection material. There was a risk of failure in the parts.
この発明は、前述の問題を解決し、中空管よりも大きい
一定の外径を持った高品質のソイルセメント柱を容易に
施工できるソイルセメント合成杭施工用オーガーを提供
することを目的とするものである。The purpose of this invention is to solve the above-mentioned problems and provide an auger for constructing soil-cement composite piles that can easily construct high-quality soil-cement columns having a constant outer diameter larger than that of hollow pipes. It is something.
前記目的を達成するために、この発明のソイルセメント
合成杭施工用オーガーにおいては、中空管7内のオーガ
ーロッド12の下部に連結されたオーガー支軸1に可動
刃支持部材2が固定され、その可動刃支持部材2にオー
ガー可動刃3の基端部が枢軸4により枢着され、オーガ
ー可動刃3の先端側が中空管7の外面を越えて突出して
いるオーガー可動刃拡開状態で、掘削攪拌終了後に切断
されるオーガー可動刃固定用シャーピング6が、オーガ
ー可動刃支持部材2とオーガー可動刃3とにわたって挿
通されている。In order to achieve the above object, in the auger for soil cement synthetic pile construction of the present invention, a movable blade support member 2 is fixed to an auger support shaft 1 connected to a lower part of an auger rod 12 in a hollow tube 7, The proximal end of the auger movable blade 3 is pivotally attached to the movable blade support member 2 by a pivot 4, and the auger movable blade 3 is in an expanded state in which the distal end side of the auger movable blade 3 protrudes beyond the outer surface of the hollow tube 7. A sharpening 6 for fixing the auger movable blade, which is cut after the completion of excavation and agitation, is inserted across the auger movable blade support member 2 and the auger movable blade 3.
また攪拌状態を良くするために、オーガー支軸1に、可
動刃支持部材2の上下方向に隣り合う位置において支持
部材2Aを回動自在に取付け、その支持部材2Aに攪拌
補助翼3Aの基端部を枢軸4により枢着し、攪拌補助翼
3Aの先端がオーガー可動刃3の先端を越えて横方向に
突出している状態で、掘削攪拌終了後に切断される攪拌
補助翼固定用シャーピン6Aを、支持部材2Aと攪拌補
助翼3Aの基端部とにわたって挿通ずる。In addition, in order to improve the stirring state, a support member 2A is rotatably attached to the auger support shaft 1 at a position vertically adjacent to the movable blade support member 2, and the base end of the stirring auxiliary blade 3A is attached to the support member 2A. The shear pin 6A for fixing the agitation auxiliary blade, which is cut off after excavation and agitation is completed, is pivoted by the pivot 4 and the tip of the agitation auxiliary blade 3A protrudes laterally beyond the tip of the auger movable blade 3. It is inserted through the support member 2A and the base end of the stirring auxiliary blade 3A.
また硬質の中間層があってもこれを容易に掘削してセメ
ントと攪拌すると共に、硬質の支持層をも容易に掘削し
てセメントと攪拌できるようにするために、オーガー支
軸1の先端部にスクリューヘッド9を固定する。In addition, even if there is a hard intermediate layer, this can be easily excavated and mixed with cement, and in order to be able to easily excavate the hard supporting layer and mix it with cement, the tip of the auger support shaft 1 is Fix the screw head 9 to.
さらにまた、縮退されたオーガー可動刃をスクリューヘ
ッドに収容できるようにするために、スクリューヘッド
IOに割り込み空間17を設ける。Furthermore, an interruption space 17 is provided in the screw head IO in order to accommodate the retracted auger movable blade in the screw head.
掘削攪拌中は、オーガー可動刃3が拡開状態で可動刃支
持部材2に対しシャーピン6により固定され、かつ掘削
攪拌終了後は、シャーピン6を切断することにより、オ
ーガー可動刃3を縮退させ、中空管7を通ってオーガー
ヘッドを地上で回収できるので、中空管7の外径より大
きく且つ一定の外径のソイルセメント柱13を確実に造
成できるばかりでなく、中空管7をソイルセメント柱を
造成しながら精度よくソイルセメント柱内に埋設するこ
とができる。During excavation agitation, the auger movable blade 3 is fixed to the movable blade support member 2 in an expanded state by a shear pin 6, and after the excavation agitation is completed, the auger movable blade 3 is retracted by cutting the shear pin 6, Since the auger head can be collected on the ground through the hollow tube 7, it is possible not only to reliably create a soil cement column 13 with a constant outer diameter that is larger than the outer diameter of the hollow tube 7, but also to remove the hollow tube 7 from soil. It is possible to bury the cement pillar within the soil cement pillar with high precision while creating the cement pillar.
またオーガー支軸lに、可動刃支持部材2の上下方向に
隣り合う位置において支持部材2Aを回動自在に取付け
、その支持部材2Aに攪拌補助翼3Aの基端部を枢軸4
により枢着し、攪拌補助翼3Aの先端がオーガー可動刃
3の先端を越えて横方向に突出している状態で、掘削攪
拌終了後に切断される攪拌補助翼固定用シャーピン6A
を、支持部材2Aと攪拌補助翼3Aの基端部とにわたっ
て挿通した場合は、掘削攪拌の際に、攪拌補助翼3Aの
先端側が地盤に係合して、その攪拌補助翼3Aの回転が
防止され、かつその攪拌補助翼3Aによってオーガー可
動刃3とソイルセメントとの共回わりが防止されるので
、ソイルセメントの攪拌混合状態が良くなる。Further, a support member 2A is rotatably attached to the auger support shaft 1 at a position vertically adjacent to the movable blade support member 2, and the base end of the stirring auxiliary blade 3A is attached to the support member 2A on the pivot 4.
The shear pin 6A for fixing the stirring auxiliary vane is cut off after excavation and stirring is completed with the tip of the stirring auxiliary vane 3A protruding laterally beyond the tip of the auger movable blade 3.
is inserted between the support member 2A and the base end of the stirring auxiliary blade 3A, the tip side of the stirring auxiliary blade 3A engages with the ground during excavation and stirring, preventing rotation of the stirring auxiliary blade 3A. In addition, the stirring auxiliary blades 3A prevent the auger movable blade 3 and the soil cement from rotating together, so that the soil cement is stirred and mixed well.
またオーガー支軸1の先端部にスクリューヘッド9を取
付けることにより、硬い中間層があっても掘削攪拌して
ソイルセメント柱13を貫通施工できると共に、支持層
を掘削攪拌してその支持層に根入れしたソイルセメント
合成支持杭を確実に築造できる。さらに支持層において
は、オーガーヘッドにおける拡開されたオーガー可動刃
の外径を変えることなく、オーガーへ7ドを逆転させて
ソイルセメントの練り返しを行なうことができるので、
オーガーヘッドの引上げ時にスクリューヘッドにより支
持地盤を乱すことがない。Furthermore, by attaching the screw head 9 to the tip of the auger support shaft 1, it is possible to penetrate the soil cement column 13 by excavating and agitating even if there is a hard intermediate layer, and also by excavating and agitating the supporting layer. It is possible to reliably construct soil-cement composite support piles. Furthermore, in the support layer, the soil cement can be kneaded by re-mixing the soil cement by reversing the direction of the auger without changing the outer diameter of the expanded movable auger blade in the auger head.
The screw head does not disturb the supporting ground when the auger head is pulled up.
さらにまた、スクリューヘッドにオーガー可動刃3を収
納できる割り込み空間17を設けることにより、大きな
スクリューへラドをオーガー支軸1の先端部に取付けて
も、オーガー可動刃3を縮退させることができる。Furthermore, by providing the cut-in space 17 in the screw head in which the auger movable blade 3 can be accommodated, the auger movable blade 3 can be retracted even if a large screw rad is attached to the tip of the auger support shaft 1.
次にこの発明を図示の例によって詳細に説明する。 Next, the present invention will be explained in detail using illustrated examples.
第1図ないし第3図は第1発明の実施例を示すものであ
って、垂直なオーガー支軸1に、複数の可動刃支持部材
2の中間部が、上下方向に間隔をおいて嵌合され、各可
動刃支持部材2はオーガー支軸1に対しボルトまたは溶
接により固定され、かつ前記オーガー支軸1の上部は、
垂直な中空管7の中心部に配置されたオーガーロッド1
2の下端部に固定され、さらに可動刃支持部材2の両端
部に、オーガー可動刃3の基端部が水平なボルトからな
る枢軸4により枢着され、その枢軸4の先端部に抜は止
め用ナツト5が螺合されている。1 to 3 show an embodiment of the first invention, in which intermediate portions of a plurality of movable blade support members 2 are fitted onto a vertical auger support shaft 1 at intervals in the vertical direction. Each movable blade support member 2 is fixed to the auger support shaft 1 by bolts or welding, and the upper part of the auger support shaft 1 is
Auger rod 1 placed in the center of vertical hollow tube 7
2, and furthermore, the base end of the auger movable blade 3 is pivotally attached to both ends of the movable blade support member 2 by a pivot shaft 4 made of a horizontal bolt, and the distal end of the pivot shaft 4 is prevented from being pulled out. A nut 5 is screwed together.
各オーガー可動刃3が拡開された状態すなわち水平に配
置された状態で、オーガー可動刃3の基端部と可動刃支
持部材2の端部とにわたってシャーピン6が挿通され、
そのシャーピン6によりオーガー可動刃3が拡開状態に
保持され、かつ拡開状態では、オーガー可動刃3が中空
管7の外面よりも外側に突出し、前記オーガー支軸1に
取付けられた可動刃支持部材2と、その可動刃支持部材
2に取付けられたオーガー可動刃3とによりオーガーヘ
ッド16が構成されている。With each auger movable blade 3 in an expanded state, that is, in a horizontally arranged state, a shear pin 6 is inserted between the base end of the auger movable blade 3 and the end of the movable blade support member 2,
The auger movable blade 3 is held in the expanded state by the shear pin 6, and in the expanded state, the auger movable blade 3 protrudes outward from the outer surface of the hollow tube 7, and the movable blade attached to the auger support shaft 1 An auger head 16 is constituted by the support member 2 and the auger movable blade 3 attached to the movable blade support member 2.
前記シャーピン6の先端部に抜は止め用割りピン24が
挿通され、かつそのシャーピン6における被せん断位置
に、V形断面のせん所用環状溝23が設けられている。A split pin 24 for preventing removal is inserted into the tip of the shear pin 6, and an annular groove 23 for shearing with a V-shaped cross section is provided at the position of the shear pin 6 to be subjected to shearing.
前記各可動刃支持部材2の外径は中空管7の内径よりも
小さく設定され、前述のように各オーガー可動刃3が拡
開された状態で、掘削攪拌が行なわれる。また掘削攪拌
終了後は、オーガーロッド12によりオーガーヘッド1
6を引き上げて、オーガー可動刃3を中空管7の下端部
に係合させ、次いでオーガーロッド12によりオーガー
支軸1を介して可動刃支持部材2を強力に引き上げるこ
とにより、シャーピン6を切断し、枢軸4を中心として
、オーガー可動刃3を第1図に鎖線で示す縮退位置に回
動させ、オーガーヘッド16の外径を中空管7の内径よ
りも小さ(する。The outer diameter of each of the movable blade supporting members 2 is set smaller than the inner diameter of the hollow tube 7, and as described above, excavation and stirring are performed with each of the auger movable blades 3 being expanded. Also, after the excavation agitation is completed, the auger head 1 is moved by the auger rod 12.
6 to engage the auger movable blade 3 with the lower end of the hollow tube 7, and then forcefully pull up the movable blade support member 2 via the auger support shaft 1 with the auger rod 12, thereby cutting the shear pin 6. Then, the auger movable blade 3 is rotated about the pivot shaft 4 to the retracted position shown by the chain line in FIG.
複数段のオーガー可動刃3を設ける場合は、縮退した状
態のオーガー可動刃3が相互に重なり合って、縮退に支
障を来たすことがないように、上下のオーガー可動刃3
の拡開縮退の回転面を、オーガー支軸lの周囲方向に偏
位させてもよい。When providing multiple stages of auger movable blades 3, the upper and lower auger movable blades 3 should be arranged so that the auger movable blades 3 in the retracted state do not overlap each other and cause problems in retraction.
The rotational surface of the expansion/retraction may be offset in the circumferential direction of the auger support shaft l.
また第1図ないし第3図に示すように、オーガー可動刃
3を、オーガー可動刃回転方向に直角な面内で拡開縮退
するように、水平な枢軸4により可動刃支持部材2に枢
着してもよく、第4図に示すように、オーガー可動刃3
をオーガー可動刃回転方向と同一面上で拡開縮退するよ
うに、垂直な枢軸4により可動刃支持部材2に枢着して
もよい。Further, as shown in FIGS. 1 to 3, the auger movable blade 3 is pivoted to the movable blade support member 2 by a horizontal pivot 4 so that it can expand and retract in a plane perpendicular to the rotational direction of the auger movable blade. As shown in Fig. 4, the auger movable blade 3
The movable blade support member 2 may be pivotally connected to the movable blade support member 2 by a vertical pivot shaft 4 so as to expand and retract on the same plane as the rotation direction of the auger movable blade.
第4図の場合は、オーガー可動刃3を縮退方向に回動さ
せるように働くばねを、オーガー可動刃3に係合させて
おくのが好ましい。In the case of FIG. 4, it is preferable to engage the auger movable blade 3 with a spring that operates to rotate the auger movable blade 3 in the retracting direction.
またセメントからなる注入材を地上から地中に供給する
ために、オーガー支軸lおよびオーガーロッド12を中
空にし、かつオーガー支軸1の先端部(下端部)に注入
材の吐出口8を設ける。In addition, in order to supply the injection material made of cement from the ground to the ground, the auger support shaft 1 and the auger rod 12 are made hollow, and a discharge port 8 for the injection material is provided at the tip (lower end) of the auger support shaft 1. .
第5図は攪拌混合状態が良(なるように構成した第2発
明の例を示すものであって、オーガー支軸1に、可動刃
支持部材2の上下方向に隣り合う位置において支持部材
2Aが回動自在に取付けられ、その支持部材2Aに攪拌
補助翼3Aの基端部が枢軸4により風着され、攪拌補助
翼3Aの先端がオーガー可動刃3の先端を越えて横方向
に突出している状態で、掘削攪拌終了後に切断される攪
拌補助翼固定用シャーピン6Aが、支持部材2Aと攪拌
補助翼3Aの基端部とにわたって挿通されている。FIG. 5 shows an example of the second invention configured to achieve a good agitation and mixing state. It is rotatably attached, and the base end of the stirring auxiliary blade 3A is attached to the support member 2A by a pivot shaft 4, and the tip of the stirring auxiliary blade 3A protrudes laterally beyond the tip of the auger movable blade 3. In this state, a shear pin 6A for fixing the agitation auxiliary blade, which is cut after the completion of excavation and stirring, is inserted between the support member 2A and the base end of the agitation auxiliary blade 3A.
第6図は第3発明の実施例を示すものであって、掘削能
力を向上させるために、オーガー支軸1の先端部(下端
部)に一対のスクリューへラド9が支軸周囲方向に間隔
をおいて配置されてボルトまたは溶接により固定され、
一対のスクリューヘッド9の外径は中空管7の外径より
も小さ(なっているが、その他の構成は第1発明の実施
例の場合と同様である。FIG. 6 shows an embodiment of the third invention, in which a pair of screw rods 9 are provided at the tip (lower end) of the auger support shaft 1 at intervals in the circumferential direction of the support shaft in order to improve excavation performance. and fixed by bolts or welding,
The outer diameter of the pair of screw heads 9 is smaller than the outer diameter of the hollow tube 7, but the other configurations are the same as in the embodiment of the first invention.
第7図は第4発明の実施例を示すものであって、掘削能
力を向上させるために、中空管7の内径よりも小さくか
つ前記一対のスクリューヘッド9の外径よりも大きい外
径を有する一対のスクリューヘッド10が、オーガー支
軸1の先端部にボルトまたは溶接により固定され、さら
に一対のスクリューヘッド10の間に、最下段のオーガ
ー可動刃3を下向きに縮退したとき、そのオーガー可動
刃3を収容できる割り込み空間17が設けられている。FIG. 7 shows an embodiment of the fourth invention, in which the outer diameter is smaller than the inner diameter of the hollow tube 7 and larger than the outer diameter of the pair of screw heads 9, in order to improve the excavation ability. A pair of screw heads 10 are fixed to the tip of the auger support shaft 1 by bolts or welding, and when the lowermost auger movable blade 3 is retracted downward between the pair of screw heads 10, the auger movable blade 3 is retracted downward. A cut-in space 17 is provided in which the blade 3 can be accommodated.
なおこの発明を実施する場合、シャーピン6としてはせ
ん所用環状溝を有するボルトを使用し、そのボルトに抜
は止め用ナツトを螺合してもよい。When carrying out the present invention, a bolt having an annular groove for drilling may be used as the shear pin 6, and a nut for preventing removal may be screwed into the bolt.
次にこの発明のソイルセメント合成杭施工用オーガーを
使用して、ソイルセメント合成杭を施工する場合の施工
例を、第8図ないし第13図によって説明する。Next, an example of construction of a soil-cement composite pile using the auger for constructing a soil-cement composite pile of the present invention will be described with reference to FIGS. 8 to 13.
なおオーガーロッド12に回転力を与え、かつ中空管7
を支持して下降させる装置は公知であるので、その詳細
な図示を省略する。Note that the rotational force is applied to the auger rod 12, and the hollow tube 7
Since the device for supporting and lowering is well known, detailed illustration thereof will be omitted.
まず第8図に示すように、地盤11上の所定の位置に、
内部にオーガーロッド12を挿通させた中空管7を垂直
状態で配置し、次に第9図に示すように、オーガーロッ
ド12の上端部をオーガー駆動装置14の駆動軸に連結
すると共に、中空管7の上端部を中空管クランプ装置1
5に連結し、かつシャーピン6を使用したオーガー可動
刃3を拡開位置に保持したオーガーヘッド16における
オーガー支軸lの上端部をオーガーロッド12の下端部
に連結し、さらにオーガー駆動装置14から中空管7に
軸力を伝達すると共に、オーガーヘッド16と中空管7
の下端部との距離を一定に保持するために、オーガー駆
動装置14と中空管クランプ装置15との間に、伸縮装
置を備えている連結装置18を介在させて結合する。First, as shown in Fig. 8, at a predetermined position on the ground 11,
The hollow tube 7 with the auger rod 12 inserted therein is arranged vertically, and then, as shown in FIG. 9, the upper end of the auger rod 12 is connected to the drive shaft of the auger drive device 14, and Hollow tube clamp device 1
5 and which holds the auger movable blade 3 using a shear pin 6 in the expanded position, the upper end of the auger support shaft l in the auger head 16 is connected to the lower end of the auger rod 12, and further from the auger drive device 14. While transmitting axial force to the hollow tube 7, the auger head 16 and the hollow tube 7
In order to maintain a constant distance from the lower end of the auger drive device 14 and the hollow tube clamp device 15, a coupling device 18 having a telescoping device is interposed and coupled.
次に第1O図に示すように、オーガー支軸1の先端の吐
出口8からセメントミルク等の硬化性注入材を地中に注
入しながら、オーガー駆動装置14によりオーガーロフ
ト12を介してオーガーヘッド16を正回転して、地盤
11の土と前記硬化性注入材とを強制攪拌し、かつ中空
管7.オーガーロフト12およびオーガーヘッド16を
下降していくことにより、中空管7の外径よりも大きな
外径のソイルセメント柱13を造成して行き、かつ中空
管7を造成されたソイルセメント柱13の中に埋設して
いく。Next, as shown in FIG. 1O, while injecting a hardening material such as cement milk into the ground from the discharge port 8 at the tip of the auger support shaft 1, the auger drive device 14 moves it through the auger loft 12 to the auger head. 16 in the forward direction to forcibly stir the soil in the ground 11 and the hardenable injection material, and the hollow tube 7. By descending the auger loft 12 and the auger head 16, a soil cement column 13 having an outer diameter larger than the outer diameter of the hollow tube 7 is created, and a soil cement column in which the hollow tube 7 is created. I will bury it in 13.
中空管7の埋設にあたっては、中空管の自重あるいは圧
入力を利用してもよい、また中空管7を下降するとき、
ソイルセメントの抵抗を軽減するために、中空管7を回
転させてもよい。When burying the hollow tube 7, the hollow tube's own weight or pressing force may be used. Also, when lowering the hollow tube 7,
The hollow tube 7 may be rotated to reduce the resistance of the soil cement.
地中の深部の支持層19においてソイルセメント柱を造
成する場合、高強度のソイルセメント柱を造成するため
、支持層19の僅か上方の位置から高濃度の注入材を地
中に注入する。またソイルセメント柱13の混合状態を
均一化するために、オーガーロッド12によりオーガー
ヘッド16を回転させながら上下移動させて、練り返し
を行なってもよい。When constructing a soil cement column in the support layer 19 deep underground, a highly concentrated injection material is injected into the ground from a position slightly above the support layer 19 in order to create a high-strength soil cement column. Further, in order to make the mixed state of the soil cement column 13 uniform, kneading may be performed by moving the auger head 16 up and down while rotating it using the auger rod 12.
練り返しを行なう場合は、中空管7と共にオーガーヘッ
ド16を上下移動させてもよ(、あるいは中空管7を一
時的に固定した状態で、連結装置18の伸縮装置により
オーガーロッド12およびオーガーヘッド16を上下移
動させる。またスクリューヘッド9あるいはスクリュー
ヘッドlOが練り返し時に支持地盤を乱さないようにす
るために、オーガーロッド12およびオーガーヘッド1
6を引上げる際に、そのオーガーロッド12によりオー
ガーヘッド16を逆回転させる。When performing kneading, the auger head 16 may be moved up and down together with the hollow tube 7 (or the hollow tube 7 may be temporarily fixed and the auger rod 12 and the auger rod 12 and the auger The head 16 is moved up and down.In order to prevent the screw head 9 or the screw head 1O from disturbing the supporting ground during kneading, the auger rod 12 and the auger head 1 are
6, the auger head 16 is reversely rotated by the auger rod 12.
中空管7が所定の深さまで到達したとき、第11図に示
すように、油圧チャック付きホルダー等のような中空管
ホルダー20により、中空管7を一時的に把持して固定
し、次いでオーガーロフト12を引上げていく。このよ
うにすると、まず拡開しているオーガー可動刃3が中空
管7の下端部に突き当たったのち、オーガーロッド12
の引上刃によりシャーピン6が切断され、オーガー可動
刃3が縮退される。オーガー可動刃3が複数段設けられ
ている場合は、前記の工程が反復して行なわれて、全数
のオーガー可動刃3が縮退される。When the hollow tube 7 reaches a predetermined depth, as shown in FIG. 11, the hollow tube 7 is temporarily gripped and fixed by a hollow tube holder 20 such as a holder with a hydraulic chuck. Next, the auger loft 12 is pulled up. In this way, the expanded movable auger blade 3 first hits the lower end of the hollow tube 7, and then the auger rod 12
The shear pin 6 is cut by the pull-up blade, and the auger movable blade 3 is retracted. When a plurality of stages of auger movable blades 3 are provided, the above steps are repeated to retract all the auger movable blades 3.
次に第12図に示すように、オーガーロッド12および
オーガーヘッド16を、中空管7内を通って引上げて撤
去する。第13図は造成されたソイルセメント合成杭2
1を示している。Next, as shown in FIG. 12, the auger rod 12 and auger head 16 are pulled up through the hollow tube 7 and removed. Figure 13 shows the constructed soil cement composite pile 2.
1 is shown.
第4図のように、オーガー可動刃3を、オーガー可動刃
回転方向と同一面上で拡開縮退するように、可動刃支持
部材2に枢着した場合は、第14図に示すように、中空
管7の下端部に予めシャーピン切断用突起22を固定し
ておき、中空管7が所定の深さに到達したとき、オーガ
ーロフト12によりオーガーヘッド16を若干引上げて
回動することにより、オーガー可動刃3を前記突起22
に衝突させてシャーピン6を切断し、オーガー可動刃3
を縮退させる。As shown in FIG. 4, when the auger movable blade 3 is pivotally attached to the movable blade support member 2 so as to expand and retract on the same plane as the auger movable blade rotation direction, as shown in FIG. A shear pin cutting protrusion 22 is fixed in advance to the lower end of the hollow tube 7, and when the hollow tube 7 reaches a predetermined depth, the auger head 16 is slightly pulled up and rotated by the auger loft 12. , the auger movable blade 3 is attached to the protrusion 22
The shear pin 6 is cut by colliding with the auger movable blade 3.
degenerate.
ソイルセメント合成杭を施工する場合、中空管7とソイ
ルセメント柱13との合成効果を高めるために、外面に
突起を固定した中空管7を使用してもよい、またオーガ
ーロフト12を中空管7内の中央部に保持するために、
オーガーロッド12に複数のスペーサを上下方向に間隔
をおいて取付けてもよい。When constructing soil-cement composite piles, in order to enhance the composite effect of the hollow tube 7 and the soil-cement pillar 13, a hollow tube 7 with protrusions fixed to its outer surface may be used, or an auger loft 12 may be installed inside the hollow tube 7. In order to hold it in the center inside the empty tube 7,
A plurality of spacers may be attached to the auger rod 12 at intervals in the vertical direction.
この発明によれば、掘削攪拌中は、拡開されたオーガー
可動刃3をシャーピン6により可動刃支持部材2に固定
し、掘削攪拌終了後は、シャーピン6を切断することに
より、オーガー可動刃3を縮退させて、オーガーヘッド
16を、中空管7内を通って撤去することができるので
、下記の効果が得られる。According to this invention, during excavation stirring, the expanded auger movable blade 3 is fixed to the movable blade support member 2 by the shear pin 6, and after the excavation agitation is finished, the auger movable blade 3 is fixed by cutting the shear pin 6. Since it is possible to retract the auger head 16 and remove it through the hollow tube 7, the following effects can be obtained.
(1) 中空管7の外径より大きい一定の外径を有す
るソイルセメント柱13を確実に造成することができる
。(1) The soil cement column 13 having a constant outer diameter larger than the outer diameter of the hollow tube 7 can be reliably created.
(2) ソイルセメント柱13の品質にバラツキが少
なく、特に支持l119においては、その支持層19を
乱すことなく、バラツキの少ない高品質高強度のソイル
セメント柱13を造成することができる。(2) There is little variation in the quality of the soil cement columns 13, and especially in the support l119, high quality and high strength soil cement columns 13 with little variation can be created without disturbing the support layer 19.
(3) ソイルセメント柱13を造成しながら、同時
に中空管7を埋設していくことができるので、中空管7
をソイルセメント柱13中に精度よく埋設できる。その
ため支持力の大きいソイルセメント合成杭を造成するこ
とができる。(3) Since the hollow pipes 7 can be buried at the same time as the soil cement pillars 13 are being created, the hollow pipes 7 can be buried at the same time.
can be buried in the soil cement pillar 13 with high precision. Therefore, soil-cement composite piles with large bearing capacity can be constructed.
(4) 長尺のソイルセメント合成杭を施工する場合
、オーガーロフト12の継ぎ足し連結部は、中空ロッド
を連結するだけでよいので、連結部の構造が単純であり
、かつ施工トラプルが少ない。(4) When constructing long soil-cement composite piles, the connecting portion of the auger loft 12 only needs to be connected with hollow rods, so the structure of the connecting portion is simple and there are fewer construction problems.
(5) 信幀性の高い高支持力のソイルセメント合成
杭を、無騒音、無振動で、確実にかつ簡単に施工できる
。(5) Soil-cement composite piles with high reliability and high bearing capacity can be constructed reliably and easily without noise or vibration.
またオーガー支軸1の先端部にスクリューヘッド9を取
付けることにより、硬い中間層があっても、容易に掘削
攪拌してソイルセメント柱13を貫通施工できると共に
、支持層19をも掘削攪拌して、その支持1119に根
入れしたソイルセメント合成杭21を確実に築造するこ
とができ、かつ支持1i19においては、オーガーヘッ
ド16における拡開されたオーガー可動刃3の外径を変
えることなく、オーガーヘッド16を逆転させて、ソイ
ルセメントの練す返しを行なうことができるので、オー
ガーヘッド16の引上げ時にオーガーヘッド16により
支持地盤を乱すことがない。Furthermore, by attaching the screw head 9 to the tip of the auger support shaft 1, even if there is a hard intermediate layer, it is possible to easily excavate and stir to penetrate the soil cement column 13, and also to drill and stir the support layer 19. , the soil cement composite pile 21 embedded in the support 1119 can be reliably constructed, and in the support 1i19, the auger head Since the soil cement can be mixed by reversing the auger head 16, the supporting ground is not disturbed by the auger head 16 when the auger head 16 is pulled up.
さらにまた、スクリューへラド10にオーガー可動刃3
を収納できる割り込み空間17を設けることにより、大
きなスクリューヘッド10をオーガー支軸lの先端部に
取付けても、オーガー可動刃3を縮退させることができ
る。Furthermore, the auger movable blade 3 is added to the screw head 10.
By providing the cut-in space 17 that can accommodate the auger movable blade 3, even when a large screw head 10 is attached to the tip of the auger support shaft l, the auger movable blade 3 can be retracted.
第1図ないし第3図は第1発明の実施例を示すものであ
って、第1図はソイルセメント合成杭施工用オーガーの
側面図、第2図はそのオーガーにおけるオーガー可動刃
枢着部およびシャーピン取付部を拡大して示す縦断側面
図、第3図は可動刃支持部材に対するオーガー可動刃の
取付部を分解して示す斜視図である。第4図は可動刃支
持部材に対するオーガー可動刃の取付部の変形例を示す
分解斜視図である。第5図は第2発明の実施例に係るソ
イルセメント合成施工用オーガーを示す側面図、第6図
は第3発明の実施例に係るソイルセメント合成杭施工用
オーガーを示す側面図、第7図は第4発明の実施例に係
るソイルセメント合成杭施工用オーガーを示す側面図で
ある。第8図ないし第13図はこの発明のソイルセメン
ト合成杭施工用オーガーを使用してソイルセメント合成
杭を築造する場合の施工順序を示す概略縦断側面図、第
14図は第4図に示すシャーピンを切断する手段を示す
斜視図である。
図において、1はオーガー支軸、2は可動刃支持部材、
2Aは支持部材、3はオーガー可動刃、3Aは攪拌補助
翼、4は枢軸、5はナツト、6はシャーピン、6Aは攪
拌補助翼固定用シャーピン、7は中空管、8は吐出口、
9および10はスクリューヘッド、11は地盤、12は
オーガーロフト、13はソイルセメント柱、14はオー
ガー駆動装置、15は中空管クランプ装置、16はオー
ガーヘッド、17は割り込み空間、18は連結装置、1
9は支持層、20は中空管ホルダー 21はソイルセメ
ント合成杭、22はシャーピン切断用突起、23はせん
断用環状溝、24は割りピンである。
第1図
第5図
3′
第6区1 to 3 show an embodiment of the first invention, in which FIG. 1 is a side view of an auger for constructing soil-cement synthetic piles, and FIG. FIG. 3 is an enlarged longitudinal sectional side view showing the shear pin attachment part, and FIG. 3 is an exploded perspective view showing the attachment part of the auger movable blade to the movable blade support member. FIG. 4 is an exploded perspective view showing a modification of the mounting portion of the auger movable blade to the movable blade support member. FIG. 5 is a side view showing an auger for soil cement synthetic pile construction according to an embodiment of the second invention, FIG. 6 is a side view showing an auger for soil cement synthetic pile construction according to an embodiment of the third invention, and FIG. FIG. 7 is a side view showing an auger for constructing soil-cement synthetic piles according to an embodiment of the fourth invention. Figures 8 to 13 are schematic vertical sectional side views showing the construction order when constructing soil cement composite piles using the soil cement composite pile construction auger of the present invention, and Figure 14 is a shear pin shown in Figure 4. FIG. 3 is a perspective view showing a means for cutting. In the figure, 1 is an auger support shaft, 2 is a movable blade support member,
2A is a support member, 3 is a movable auger blade, 3A is a stirring auxiliary blade, 4 is a pivot, 5 is a nut, 6 is a shear pin, 6A is a shear pin for fixing the stirring auxiliary blade, 7 is a hollow tube, 8 is a discharge port,
9 and 10 are screw heads, 11 is the ground, 12 is an auger loft, 13 is a soil cement column, 14 is an auger drive device, 15 is a hollow tube clamp device, 16 is an auger head, 17 is an interruption space, and 18 is a coupling device ,1
9 is a support layer, 20 is a hollow tube holder, 21 is a soil cement composite pile, 22 is a shear pin cutting protrusion, 23 is an annular groove for shearing, and 24 is a cotter pin. Figure 1 Figure 5 3' Ward 6
Claims (4)
れたオーガー支軸1に可動刃支持部材2が固定され、そ
の可動刃支持部材2にオーガー可動刃3の基端部が枢軸
4により枢着され、オーガー可動刃3の先端側が中空管
7の外面を越えて突出しているオーガー可動刃拡開状態
で、掘削攪拌終了後に切断されるオーガー可動刃固定用
シャーピン6が、オーガー可動刃支持部材2とオーガー
可動刃3とにわたって挿通されているソイルセメント合
成杭施工用オーガー。(1) The movable blade support member 2 is fixed to the auger support shaft 1 connected to the lower part of the auger rod 12 in the hollow tube 7, and the base end of the auger movable blade 3 is attached to the movable blade support member 2 via the pivot shaft 4. The auger movable blade fixing shear pin 6, which is cut after the completion of excavation and agitation, is pivotally attached to the auger movable blade 3 and the auger movable blade 3 is in an expanded state where the tip side protrudes beyond the outer surface of the hollow tube 7. An auger for constructing soil cement synthetic piles that is inserted between a blade support member 2 and an auger movable blade 3.
に隣り合う位置において支持部材2Aが回動自在に取付
けられ、その支持部材2Aに攪拌補助翼3Aの基端部が
枢軸4により枢着され、攪拌補助翼3Aの先端がオーガ
ー可動刃3の先端を越えて横方向に突出している状態で
、掘削攪拌終了後に切断される攪拌補助翼固定用シャー
ピン6Aが、支持部材2Aと攪拌補助翼3Aの基端部と
にわたって挿通されている請求項1記載のソイルセメン
ト合成杭施工用オーガー。(2) A support member 2A is rotatably attached to the auger support shaft 1 at a position vertically adjacent to the movable blade support member 2, and the base end of the stirring auxiliary blade 3A is attached to the support member 2A by the pivot 4. The shear pin 6A for fixing the stirring auxiliary blade, which is cut off after the completion of excavation and stirring, is pivotally mounted and the tip of the stirring auxiliary blade 3A protrudes laterally beyond the tip of the auger movable blade 3. The auger for constructing soil cement synthetic piles according to claim 1, which is inserted through the base end of the aileron 3A.
けられている請求項1または2記載のソイルセメント合
成杭施工用オーガー。(3) The auger for constructing soil cement synthetic piles according to claim 1 or 2, wherein a screw head is provided at the tip of the auger support shaft 1.
ーヘッドが、縮退されたオーガー可動刃3を収納できる
割り込み空間17を備えている請求項1または2記載の
ソイルセメント合成杭施工用オーガー。(4) The auger for soil-cement composite pile construction according to claim 1 or 2, wherein the screw head attached to the tip of the auger support shaft 1 is provided with an interruption space 17 in which the retracted movable auger blade 3 can be accommodated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP706490A JP2688622B2 (en) | 1990-01-18 | 1990-01-18 | Auger for soil cement composite pile construction and soil cement composite pile construction method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP706490A JP2688622B2 (en) | 1990-01-18 | 1990-01-18 | Auger for soil cement composite pile construction and soil cement composite pile construction method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH03212506A true JPH03212506A (en) | 1991-09-18 |
JP2688622B2 JP2688622B2 (en) | 1997-12-10 |
Family
ID=11655639
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP706490A Expired - Lifetime JP2688622B2 (en) | 1990-01-18 | 1990-01-18 | Auger for soil cement composite pile construction and soil cement composite pile construction method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2688622B2 (en) |
Cited By (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06173254A (en) * | 1992-07-02 | 1994-06-21 | Mitani Sekisan Co Ltd | Concrete pile installation method in hollow excavation method, and excavation device, veneering device and excavating blade in hollow excavation method |
US5411353A (en) * | 1993-09-01 | 1995-05-02 | Taki; Osamu | Soil solidification apparatus with a shear blade of adjustable length and rotation speed for creating a ribbed soil-cement pile |
US5484233A (en) * | 1994-03-01 | 1996-01-16 | Kabushiki Kaisha Ask Ken Kyusho | Excavator and a method of forming a modified ground in an earthen foundation with the use of the same |
US5503501A (en) * | 1994-03-01 | 1996-04-02 | Kabushiki Kaisha Ask Kenkyusho | Excavator and a method of forming a modified ground in an earthen foundation with the use of the same |
JPH0892952A (en) * | 1994-09-27 | 1996-04-09 | Ask Kenkyusho:Kk | Ground improvement device and ground improvement method |
US5645376A (en) * | 1993-09-01 | 1997-07-08 | Taki; Osamu | Soil solidification apparatus with a shear blade of adjustable length and rotation speed for creating a ribbed soil-cement pile |
JP2006342560A (en) * | 2005-06-08 | 2006-12-21 | Toyo Asano Found Co Ltd | Construction method of foundation pile |
JP2017061787A (en) * | 2015-09-24 | 2017-03-30 | 前田製管株式会社 | Head for drilling expanded hole |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP6710236B2 (en) * | 2018-05-23 | 2020-06-17 | 和夫 渡邉 | Drilling stirrer |
-
1990
- 1990-01-18 JP JP706490A patent/JP2688622B2/en not_active Expired - Lifetime
Cited By (9)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH06173254A (en) * | 1992-07-02 | 1994-06-21 | Mitani Sekisan Co Ltd | Concrete pile installation method in hollow excavation method, and excavation device, veneering device and excavating blade in hollow excavation method |
US5411353A (en) * | 1993-09-01 | 1995-05-02 | Taki; Osamu | Soil solidification apparatus with a shear blade of adjustable length and rotation speed for creating a ribbed soil-cement pile |
US5645376A (en) * | 1993-09-01 | 1997-07-08 | Taki; Osamu | Soil solidification apparatus with a shear blade of adjustable length and rotation speed for creating a ribbed soil-cement pile |
US5484233A (en) * | 1994-03-01 | 1996-01-16 | Kabushiki Kaisha Ask Ken Kyusho | Excavator and a method of forming a modified ground in an earthen foundation with the use of the same |
US5503501A (en) * | 1994-03-01 | 1996-04-02 | Kabushiki Kaisha Ask Kenkyusho | Excavator and a method of forming a modified ground in an earthen foundation with the use of the same |
JPH0892952A (en) * | 1994-09-27 | 1996-04-09 | Ask Kenkyusho:Kk | Ground improvement device and ground improvement method |
JP2006342560A (en) * | 2005-06-08 | 2006-12-21 | Toyo Asano Found Co Ltd | Construction method of foundation pile |
JP4589813B2 (en) * | 2005-06-08 | 2010-12-01 | 株式会社トーヨーアサノ | How to build an enlarged bulb for root consolidation |
JP2017061787A (en) * | 2015-09-24 | 2017-03-30 | 前田製管株式会社 | Head for drilling expanded hole |
Also Published As
Publication number | Publication date |
---|---|
JP2688622B2 (en) | 1997-12-10 |
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