JP2995508B2 - Prevention method of backflow of excavated soil to the pile consolidation part in pile digging method - Google Patents
Prevention method of backflow of excavated soil to the pile consolidation part in pile digging methodInfo
- Publication number
- JP2995508B2 JP2995508B2 JP3256986A JP25698691A JP2995508B2 JP 2995508 B2 JP2995508 B2 JP 2995508B2 JP 3256986 A JP3256986 A JP 3256986A JP 25698691 A JP25698691 A JP 25698691A JP 2995508 B2 JP2995508 B2 JP 2995508B2
- Authority
- JP
- Japan
- Prior art keywords
- excavated soil
- pile
- rod
- spiral
- drilling
- 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
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- Earth Drilling (AREA)
Description
【０００１】[0001]
【産業上の利用分野】この発明は、杭穴の中掘工法で、
掘削ロッド逆回転時に、掘削土が杭穴根固め部へ逆流す
ることを防止する杭穴の中掘工法における掘削土の杭穴
根固め部への逆流防止方法に関する。The present invention relates to a method of digging a pile hole,
The present invention relates to a method for preventing a backflow of excavated soil to a pile-hole consolidation part in a borehole excavation method for preventing excavated soil from flowing back to a pile-hole consolidation part during a reverse rotation of a drilling rod.
【０００２】[0002]
【従来の技術】従来、杭穴の中掘工法に用いる掘削ロッ
ドでは掘削土を効率良く排土する為に、掘削ヘッドの直
上から掘削ロッドにスパイラルを取り付けて構成した掘
削ロッドを使用して杭穴を掘削していた。2. Description of the Related Art Conventionally, in a drilling rod used in a drilling method for a pile hole, in order to efficiently excavate the excavated soil, a pile is formed by attaching a spiral to the drilling rod directly above a drilling head. Drilling a hole.
【０００３】[0003]
【発明が解決しようとする課題】前記従来の技術では、
掘削完了時に掘削ヘッドを一旦逆回転して、掘削ヘッド
先端からセメントミルクを注入しながら引き上げ、再び
正回転してあるいは回転 をせずに、中空杭内を地上まで
引き上げる。この際に、掘削ロッドを逆回転するので、
スパイラル内に残っている掘削土が逆流して下方に運ば
れ、杭穴内に押し付けられる。従って、この掘削土がセ
メントミルク内に混入するので、セメントミルクの固化
後の強度が低下する問題点があった。In the above prior art,
When the drilling is completed, rotate the drilling head in the reverse direction once, pull up while injecting cement milk from the tip of the drilling head , and again
With or without rotating , inside the hollow pile to the ground
Raising Ru. At this time, since the drill rod is rotated in reverse,
The excavated soil remaining in the spiral flows backward and is carried downward, and is pressed into the pile hole. Therefore, since the excavated soil is mixed into the cement milk, there is a problem that the strength of the cement milk after solidification is reduced.
【０００４】[0004]
【課題を解決するための手段】然るにこの発明は、逆回
転時に掘削ヘッド上方に撹拌された掘削土層を形成して
掘削土の逆流を防止したので、前記問題点を解決した。However, the present invention has solved the above-mentioned problem by forming an agitated excavated soil layer above the excavation head during reverse rotation to prevent backflow of excavated soil.
【０００５】即ちこの発明は、掘削ヘッドの上方に撹拌
手段を介してスパイラルを取付けた掘削ロッドを、中空
杭内に挿入して使用し、該ロッドの正回転時に掘削土を
持ち上げるようにした杭穴の中掘工法において、杭穴掘
削完了後に、前記掘削ロッドを逆回転して、掘削ロッド
の下端から杭穴内にセメントミルクを放出しながら前記
掘削ロッドを引き上げる際に、前記掘削ロッドを前記撹
拌手段が前記中空杭内に至るまで引き上げ、前記掘削ロ
ッドの逆回転により、前記スパイラルから下方に押圧さ
れて逆送される掘削土を、前記撹拌手段で撹拌して、撹
拌手段の周辺に、撹拌された掘削土層を形成し、杭穴の
根固め部のセメントミルク内へ、前記スパイラル上から
掘削土が強制的に押し込まれることを防止することを特
徴とした杭穴の中掘工法における掘削土の逆流防止方法
である。Namely this invention, agitation above the drilling head
Drilling rod with a spiral mounted through the means , hollow
It is inserted into the pile used in drilling method in the Kuiana you lift the excavated soil during forward rotation of the rod, Kuianaho
After cutting is completed, the drilling rod is rotated in the reverse direction to
While discharging the cement milk into the pile hole from the lower end of the
When raising the drilling rod, the drilling rod is
拌means pulling until reaching the hollow pile, and more reverse rotation of the drill rod, pressing of the said spiral downward
Is in the backhaul is the excavated soil, and stirred at the stirring means, 撹
A stirred excavated soil layer is formed around the stirring means ,
From the top of the spiral into the cement milk of the root consolidation part
This is a method for preventing backflow of excavated soil in a borehole excavation method characterized by preventing excavated soil from being forcibly pushed .
【０００６】[0006]
【作用】この発明は、掘削ロッドの逆回転時に、掘削ヘ
ッドの上方に撹拌された掘削土層を形成できるので、ス
パイラルから下方に送られる掘削土と杭穴の根固め部内
の根固め液（セメントミルク）とを撹拌された掘削土層
で隔離して、掘削土の根固め液内への逆流を防止させ
る。また、掘削土を撹拌してなる撹拌された掘削土層と
根固め液とは比重が違うので、互いに混ざりにくい。[Action] The present invention, during the reverse rotation of the drill rod, drill f
The agitated excavated soil layer can be formed above the pad, so that the excavated soil sent downward from the spiral and the consolidation liquid (cement milk) in the pile consolidation section are isolated by the agitated excavated soil layer. To prevent backflow of excavated soil into the consolidation liquid. In addition, since the agitated excavated soil layer formed by agitating the excavated soil and the root consolidation liquid have different specific gravities, they are hardly mixed with each other.
【０００７】[0007]
【実施例】図面に基づきこの発明の実施例を説明する。An embodiment of the present invention will be described with reference to the drawings.
【０００８】杭穴掘削用の中空の掘削ロッド本体１の下
端部に、先端に掘削刃２、２を突設した掘削ヘッド３を
取り付ける。前記掘削ロッド本体１の上方に所定距離Ｌ
の無スパイラル部４を設けた上方に、スパイラル５を取
り付ける。前記において、距離Ｌは、杭の外径をＤとし
た時、Ｌ＝２Ｄ、とする。前記掘削ロッド本体１の無ス
パイラル部４に等間隔で放射状に撹拌棒６、６を突設
し、杭穴掘削ロッド７を構成する（図１）。前記におい
て、スパイラル５は杭穴掘削ロッド７を正回転した際
に、掘削土を上方に移送できるように形成されている。
また、図中８はセメントミルク放出口、９は拡底掘削刃
である。An excavating head 3 having excavating blades 2 and 2 at its tip is attached to the lower end of a hollow excavating rod body 1 for excavating a pile hole. A predetermined distance L above the drill rod body 1
The spiral 5 is attached above the non-spiral portion 4 provided. In the above, the distance L is L = 2D, where D is the outer diameter of the pile. Stir bars 6, 6 are radially provided at equal intervals on the non-spiral portion 4 of the drill rod body 1 to form a pile hole drill rod 7 (FIG. 1). In the above, the spiral 5 is formed so that the excavated soil can be transferred upward when the pile hole excavating rod 7 is rotated forward.
In the figure, reference numeral 8 denotes a cement milk discharge port, and reference numeral 9 denotes an enlarged bottom excavation blade.
【０００９】次に、杭穴掘削ロッド７を正回転して、杭
１０を沈設しながら、所定の杭穴１１を掘削する（図
１）。次に、拡底掘削刃９を開き、杭穴掘削ロッド７を
逆回転して、杭穴の拡底部１１ａを掘削し、掘削は完了
する（図２（ａ））。Next, the pile hole excavating rod 7 is rotated forward to excavate a predetermined pile hole 11 while the pile 10 is being laid (FIG. 1). Next, the bottom excavation blade 9 is opened, and the pile hole excavation rod 7 is rotated in the reverse direction to excavate the bottom portion 11a of the pile hole, and the excavation is completed (FIG. 2A).
【００１０】次に、杭穴掘削ロッド７を逆回転し、セメ
ントミルク放出口８からセメントミルク１２を杭穴１１
内に放出しながら、杭穴掘削ロッド７を引き上げる。こ
の際、スパイラル５上の掘削土１３は下方に押圧されて
逆流するが、杭１０内に収容された前記撹拌棒６、６の
周辺で、撹拌された掘削土層１４を形成する（図２
（ｂ））。従って、セメントミルク１２内に掘削土を混
入することを防止できる。Next, the pile hole drilling rod 7 is rotated in the reverse direction, and the cement milk 12 is discharged from the cement milk discharge port 8 into the pile hole 11.
While releasing within, bring can pull the Kuiana drill rod 7. In this case, excavated soil 13 on the spiral 5 is flow back is pressed downward, around the stirring rod 6, 6 accommodated in the pile 10, to form a Kezudoso 14 drilling which is stirred (Figure 2
(B)). Therefore, it is possible to prevent the excavated soil from being mixed into the cement milk 12.
【００１１】前記実施例において、無スパイラル部４の
距離Ｌは、Ｌ＝２Ｄ、としたが、「Ｌ＝Ｄ」乃至「Ｌ＝
３Ｄ」程度であれば可能であり、「Ｌ＜Ｄ」では粗の掘
削土層１４の厚さが薄くなり、隔離効果が少なく「Ｌ＞
３Ｄ」では、正回転時の掘削土の上方への移送効率が悪
い。また、前記実施例に使用した掘削ロッドにおいて、
杭穴掘削ヘッド７の無スパイラル部４に撹拌棒６を突設
したが、他の撹拌手段でも可能である。掘削ヘッドに拡
底用掘削刃を設けたが作動形式は任意であり、また、拡
底用掘削刃９は設けなくてもよい。In the above embodiment, the distance L of the non-spiral portion 4 is L = 2D, but "L = D" to "L = D".
3D ”is possible. In“ L <D ”, the thickness of the rough excavated soil layer 14 is small, and the isolation effect is small and“ L> D ”.
In “3D”, the efficiency of transferring the excavated soil upward during forward rotation is poor. In the drill rod used in the above embodiment,
Although the stirring rod 6 protrudes from the non-spiral portion 4 of the pile hole excavating head 7, other stirring means can be used. Although the excavating head is provided with the excavating blade for enlarging the bottom, the operation type is arbitrary, and the excavating blade 9 for enlarging the bottom may not be provided.
【００１２】[0012]
【発明の効果】この発明は、杭の中掘工法において、掘
削ロッドの掘削ヘッドの上方に、撹拌された掘削土層を
形成できるので、杭穴掘削ロッドの正回転時に、掘削土
を効率良く上方へ移送することができると共に、逆回転
時に、スパイラルから下方に送られる掘削土が押圧され
た状態で、根固め用のセメントミルク内に混入すること
を防止できる。従って、撹拌した掘削土層から掘削土
が、落下した場合であっても、比重の大きなセメントミ
ルク層の上面に留めることができ、セメントミルクと掘
削土とが混じり合うことはなく、かつ根固め部予定位置
を十分に撹拌混合できるので、強固な根固め部を形成で
きる効果がある。According to the present invention, the excavated soil can be efficiently formed at the time of forward rotation of the pile hole excavation rod because the agitated excavated soil layer can be formed above the excavation head of the excavation rod in the pile excavation method. The excavated soil sent downward from the spiral is pressed during the reverse rotation while being transported upward.
In the state, Ru can be prevented from being mixed into the cement milk for the root firm. Therefore, the excavated soil is
However, even if it falls, a cement
Can be fastened on top of the luk layer and can be dug with cement milk
Since the excavated soil does not mix with each other, and the expected location of the rooting portion can be sufficiently stirred and mixed, there is an effect that a strong rooting portion can be formed.
【図１】この発明の実施例の正面図である。FIG. 1 is a front view of an embodiment of the present invention.
【図２】（ａ）（ｂ）はこの発明の装置の使用状態を示
す正面図である。FIGS. 2A and 2B are front views showing a state of use of the apparatus of the present invention.
３ 掘削ヘッド ４ 無スパイラル部 ５ スパイラル ６ 撹拌棒（撹拌手段） ７ 杭穴掘削ヘッド１０ 杭（中空杭） １３ 掘削土 １４ 撹拌された掘削土層3 drilling head 4 No spiral portion 5 Spiral 6 stirring rod (stirring means) 7 Kuiana drilling head 10 piles (hollow pile) 13 excavated soil 14 stirred excavated soil layer
Claims (1)
パイラルを取付けた掘削ロッドを、中空杭内に挿入して
使用し、該ロッドの正回転時に掘削土を持ち上げるよう
にした杭穴の中掘工法において、杭穴掘削完了後に、前
記掘削ロッドを逆回転して、掘削ロッドの下端から杭穴
内にセメントミルクを放出しながら前記掘削ロッドを引
き上げる際に、前記掘削ロッドを前記撹拌手段が前記中
空杭内に至るまで引き上げ、前記掘削ロッドの逆回転に
より、前記スパイラルから下方に押圧されて逆送される
掘削土を、前記撹拌手段で撹拌して、撹拌手段の周辺
に、撹拌された掘削土層を形成し、杭穴の根固め部のセ
メントミルク内へ、前記スパイラル上から掘削土が強制
的に押し込まれることを防止することを特徴とした杭穴
の中掘工法における掘削土の逆流防止方法。(1)DiggingAbove the grinding headVia stirring meansS
Attached a spiralInsert the drill rod into the hollow pile
use,Lift the excavated soil when the rod rotates forward
In the drilling method of the pile holeAfter excavation of pile hole, before
Rotate the drilling rod in the reverse direction to
Pull the drill rod while discharging cement milk into the
When the drilling rod is lifted, the stirring means
Pull up to the empty pile,For reverse rotation of the drilling rod
More, it is pushed downward from the spiral and sent back
Excavated soil is stirred by the stirring means.StirAround the stirring means
ToAgitatedForming excavated soil layers,At the bottom of the pile hole
Into the ment milk,From above the spiralExcavated soil forced
Prevent intrusionPile holes characterized by
For preventing backflow of excavated soil in underground mining method.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256986A JP2995508B2 (en) | 1991-09-09 | 1991-09-09 | Prevention method of backflow of excavated soil to the pile consolidation part in pile digging method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3256986A JP2995508B2 (en) | 1991-09-09 | 1991-09-09 | Prevention method of backflow of excavated soil to the pile consolidation part in pile digging method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0598880A JPH0598880A (en) | 1993-04-20 |
| JP2995508B2 true JP2995508B2 (en) | 1999-12-27 |
Family
ID=17300141
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3256986A Expired - Lifetime JP2995508B2 (en) | 1991-09-09 | 1991-09-09 | Prevention method of backflow of excavated soil to the pile consolidation part in pile digging method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2995508B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5024692B2 (en) * | 1999-12-27 | 2012-09-12 | 三谷セキサン株式会社 | Construction method of foundation pile, ready-made pile, pile hole drilling rod |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5944486A (en) * | 1982-09-08 | 1984-03-12 | 株式会社武智工務所 | Drilling machine |
-
1991
- 1991-09-09 JP JP3256986A patent/JP2995508B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0598880A (en) | 1993-04-20 |
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