JP2848100B2 - Underground pile driving method - Google Patents
Underground pile driving methodInfo
- Publication number
- JP2848100B2 JP2848100B2 JP4085499A JP8549992A JP2848100B2 JP 2848100 B2 JP2848100 B2 JP 2848100B2 JP 4085499 A JP4085499 A JP 4085499A JP 8549992 A JP8549992 A JP 8549992A JP 2848100 B2 JP2848100 B2 JP 2848100B2
- Authority
- JP
- Japan
- Prior art keywords
- pile
- earth
- auger
- auger blade
- sand
- 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
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Description
【0001】[0001]
【産業上の利用分野】この発明は、鋼管杭やPC杭など
の中空の既製杭を地中に埋め込む中掘り式杭打ち工法に
関し、特に、杭の中空部の地盤を掘削するオーガ羽根に
対する土砂の不着を防止する技術改良に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mid-digging pile driving method for embedding a hollow ready-made pile such as a steel pipe pile or a PC pile in the ground, and more particularly, to a method for excavating soil in an auger blade for excavating a hollow ground of a pile. The present invention relates to a technical improvement for preventing non-sticking.
【0002】[0002]
【従来の技術】よく知られているように中掘り式杭打ち
工法では、既製杭の中空部を掘削しながら杭自重、圧入
または打撃を加えることにより杭を沈設させる。杭内の
掘削には一般にアースオーガが用いられる。杭打ちに伴
う騒音や振動を低減したい場合にこの中掘り式杭打ち工
法が適している。2. Description of the Related Art As is well known, in a mid-digging pile driving method, a pile is laid by excavating a hollow portion of a ready-made pile by applying its own weight, press-fitting, or hitting. An earth auger is generally used for excavation in a pile. This digging type pile driving method is suitable for reducing noise and vibration caused by pile driving.
【0003】[0003]
【発明が解決しようとする課題】中掘り式杭打ち工法の
場合、杭の沈設に伴う土砂の掘削と、掘削した土砂を杭
頭部より排出する処理とを円滑に進めることが、施工速
度を向上させる上での重要なポイントである。掘削と掘
削土砂の排出処理の作業を行う上で大きな問題になるの
は、オーガ羽根に土砂が付着しやすいということであ
る。特に粘性の高い地盤をアースオーガで掘削する場
合、オーガ羽根と土砂との摩擦力、付着力、結合力が大
きいので、掘削抵抗が大きく、トルクの大きな駆動装置
を用いても満足な速度で掘削することができない。また
杭頭部から掘削土砂を排出する際にも、粘性土は強固に
オーガ羽根に付着しているので、これを掻き落とすのに
非常に手数がかかる。通常はスコップなどを用いて人力
でオーガ羽根の付着土砂を取り除いている。この作業を
自動化する掻き落とし装置も開発されているが、地上側
の機械設備が複雑で大型になるという問題がある。特に
中掘り式杭打ち工法では掘削しながら杭を圧入または打
撃する装置がアースオーガに付設されているので、これ
だけでも地上側の装置が複雑になっており、付着土砂の
掻き落とし装置をさらに追加するのは難しい。[0009] In the case of the middle-digging type pile driving method, the excavation of the soil and the excavation of the excavated soil from the pile head can be smoothly carried out, and the construction speed can be reduced. This is an important point in improving. A major problem in excavation and excavation work is that the auger blades are liable to sediment. Especially when excavating highly viscous ground with an earth auger, the frictional force, adhesion and bonding force between the auger blade and the earth and sand are large, so the excavation resistance is large and the excavation is at a satisfactory speed even with a large torque driving device Can not do it. Also, when the excavated earth and sand is discharged from the pile head, the viscous soil is firmly attached to the auger blade, so it takes a lot of trouble to scrape off the soil. Usually, the soil attached to the auger blade is removed manually using a scoop or the like. Although a scraping device for automating this operation has been developed, there is a problem that the mechanical equipment on the ground side is complicated and large. Especially in the medium digging type pile driving method, a device that presses or hits the pile while excavating is attached to the earth auger, so the device on the ground side alone is complicated, and a device for scraping off attached sediment is further added. Hard to do.
【0004】この発明は前述した従来の問題点に鑑みな
されたもので、その目的は、アースオーガを用いて中掘
り式杭打ち工法を実施するに際し、オーガ羽根と掘削土
砂との摩擦力、付着力、結合力を弱めて掘削と掘削土砂
の排出処理を能率よく行えるようにすることにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has as its object the purpose of performing a mid-digging pile driving method using an earth auger, the frictional force between an auger blade and excavated earth and sand, and an additional force. An object of the present invention is to make excavation and excavated earth and sand discharge processing efficient by weakening the bonding force and the binding force.
【0005】[0005]
【課題を解決するための手段】そこでこの発明では、一
部または全部が金属部材からなる中空の既製杭を立設
し、その杭の中空部の地盤をアースオーガにより掘削し
ながら杭を地中に沈設させる中掘り式杭打ち工法におい
て、杭打ち過程または杭打ち後の地中にあるオーガ羽根
と前記杭の金属部材との間に前記オーガ羽根をマイナス
極とし前記金属部材をプラス極として直流電圧を印加し
て通電し、前記杭の中空部内の土砂に含まれる電解質溶
液を媒介として電気分解を生じさせて前記オーガ羽根表
面から水素ガスを発生させ、これによってオーガ羽根と
土砂との結合を弱めるようにした。Therefore, according to the present invention, a hollow ready-made pile partially or entirely made of a metal member is erected, and the ground is excavated in the hollow part of the pile by an earth auger while the pile is underground. In the digging type pile driving method, the auger blade is a negative pole between the auger blade in the ground during the pile driving process or after the pile driving and the metal member of the pile, and the DC A voltage is applied and energized, and electrolysis is caused by the electrolyte solution contained in the earth and sand in the hollow portion of the pile to generate hydrogen gas from the surface of the auger blade, thereby forming a bond between the auger blade and the earth and sand. I tried to weaken it.
【0006】[0006]
【作用】通常の条件の地盤であれば相当量の水分を含ん
でおり、また多くの電解質を含んでいる。したがって地
盤に2つの電極を挿入して直流電圧を印加すると、土砂
中の電解質溶液を媒介として電極間で電気分解反応が生
じ、マイナス極側に水素ガスが発生する。これと同じ現
象が前記のオーガ羽根と杭の金属部材との間で起き、オ
ーガ羽根の表面から水素ガスが発生する。このガス発生
時のガスの膨張などによって、オーガ羽根の表面と土砂
塊とが剥離し、オーガ羽根の回転に対する土砂の摩擦力
が低減するし、羽根に付着した土砂も容易に脱落するよ
うになる。また電気浸透現象によって地中の水分がマイ
ナス極(オーガ羽根)側に集り、オーガ羽根の表面まわ
りの土砂が柔らかくなる効果も生じ、前記のガス発生の
効果をいっそう高める。The ground under normal conditions contains a considerable amount of water and contains a large amount of electrolyte. Therefore, when two electrodes are inserted into the ground and a DC voltage is applied, an electrolysis reaction occurs between the electrodes via the electrolyte solution in the earth and sand, and hydrogen gas is generated on the negative electrode side. The same phenomenon occurs between the auger blade and the metal member of the pile, and hydrogen gas is generated from the surface of the auger blade. Due to the expansion of the gas at the time of the gas generation, the surface of the auger blade is separated from the earth and sand mass, the frictional force of the earth and sand against the rotation of the auger blade is reduced, and the earth and sand attached to the blade is also easily dropped. . Also, due to the electroosmosis phenomenon, moisture in the ground collects on the minus pole (auger blade) side, and the effect of softening the earth and sand around the surface of the auger blade also occurs, thereby further enhancing the above-described gas generation effect.
【0007】[0007]
【実施例】中掘り式杭打ち工法によりPC杭を沈設する
様子を図1に示している。同図のように、ベースマシン
1により支柱2が垂直に支持され、オーガ駆動装置3、
杭圧入装置4、杭頭部押え装置5が支柱2にガイドされ
て上下に移動するように取り付けられている。PC杭6
が支柱2に沿うように垂直に立設され、その上端に杭頭
部押え装置5が当てがわれ、油圧駆動式の杭圧入装置4
が杭頭部押え装置5を介してPC杭6に圧入力を加え
る。オーガ駆動装置3から下方に導出されている長いオ
ーガ軸7が杭圧入装置4、杭頭部押え装置5を貫通して
PC杭6の中空部に入り込んでいる。このオーガ軸7の
周囲にスクリュー状のオーガ羽根8が一体的に設けられ
ており、オーガ駆動装置3によってオーガ羽根8を回転
させてPC杭6の中空部の地盤を掘削する。以上はアー
スオーガを用いた中掘り式杭打ち工法の一般的な実施形
態である。FIG. 1 shows a state in which a PC pile is laid by a medium digging type pile driving method. As shown in the figure, the support column 2 is vertically supported by the base machine 1, and the auger driving device 3,
The pile press-in device 4 and the pile head holding device 5 are mounted so as to move up and down while being guided by the columns 2. PC pile 6
Is vertically erected along the column 2, and a pile head holding device 5 is applied to the upper end thereof, and a hydraulically driven pile press-in device 4 is provided.
Applies a pressure input to the PC pile 6 via the pile head holding device 5. A long auger shaft 7 extending downward from the auger driving device 3 penetrates the pile press-in device 4 and the pile head holding device 5 and enters the hollow portion of the PC pile 6. A screw-shaped auger blade 8 is integrally provided around the auger shaft 7, and the auger drive device 3 rotates the auger blade 8 to excavate the ground in the hollow portion of the PC pile 6. The above is a general embodiment of the inside digging type pile driving method using the earth auger.
【0008】次にこの発明の特徴部分について詳述す
る。Next, the features of the present invention will be described in detail.
【0009】図2に要部の詳細を示すように、一般的な
PC杭6では、その上端と下端にそれぞれ金属リング6
aが一体に付設されているとともに、内部には全長にわ
たって鋼棒6bが埋め込まれている。そして杭6の上端
と下端の金属リング6aは鋼棒6bを介して電気的に接
続されている。これら金属リング6aおよび鋼棒6bが
前述した既製杭の金属部材に相当する。As shown in detail in FIG. 2, a typical PC pile 6 has metal rings 6 at its upper and lower ends, respectively.
a is integrally provided, and a steel rod 6b is embedded inside the steel rod 6b over its entire length. The metal rings 6a at the upper and lower ends of the pile 6 are electrically connected via a steel bar 6b. The metal ring 6a and the steel bar 6b correspond to the metal members of the above-mentioned ready-made pile.
【0010】この実施例では、適宜な直流電源9を用意
し、PC杭6の頭部の金属リング6aをリード線10を
介して電源9のプラス端子に接続する。リード線10と
金属リング6aとは適宜な締結具を介して、あるいは溶
接してしっかりと接続し、この金属リング6aと杭頭部
押え装置5とが電気的に絶縁されるように、杭頭部押え
装置5の絶縁材5aのみが金属リング6aに当たる構成
にしている。これで地中に埋設されているPC杭6の先
端の金属リング6aと内部の鋼棒6bとが直流電源9の
プラス極に接続されたことになる。In this embodiment, an appropriate DC power supply 9 is prepared, and a metal ring 6a at the head of the PC pile 6 is connected to a positive terminal of the power supply 9 via a lead wire 10. The lead wire 10 and the metal ring 6a are firmly connected to each other through appropriate fasteners or by welding, and the metal ring 6a and the pile head holding device 5 are electrically insulated from each other. The configuration is such that only the insulating material 5a of the part holding device 5 contacts the metal ring 6a. Thus, the metal ring 6a at the tip of the PC pile 6 buried underground and the steel bar 6b inside are connected to the positive pole of the DC power supply 9.
【0011】一方、前記のオーガ軸7およびオーガ羽根
8は金属製で、これを次の構成で直流電源9のマイナス
極に接続する。つまり、オーガ軸7の根元部分の外周に
軸と一体に回転するスリップリング11を取り付けると
ともに、常にスリップリング11に摺接するブラシ12
をオーガ駆動装置3のフレーム部分に取り付ける。そし
てブラシ12と直流電源9のマイナス端子とをリード線
13で接続する。On the other hand, the auger shaft 7 and the auger blade 8 are made of metal and are connected to the negative pole of the DC power supply 9 in the following configuration. That is, the slip ring 11 that rotates integrally with the shaft is attached to the outer periphery of the root portion of the auger shaft 7, and the brush 12 that always slides on the slip ring 11.
To the frame portion of the auger drive 3. Then, the brush 12 and the negative terminal of the DC power supply 9 are connected by the lead wire 13.
【0012】杭6の打込み過程では、杭先端の金属リン
グ6a、鋼棒6bとオーガ羽根8は地中にある。土砂を
挟んで地中に存在するオーガ羽根8と金属リング6aと
に前述の極性で直流電圧を印加すると、土砂中の電解質
溶液を媒介として電流が流れ、電気分解反応が起きる。
その結果、マイナス極であるオーガ羽根8とオーガ軸7
の地中部分の表面から水素ガスが発生するとともに、土
砂中の水分がマイナス極側に集る。ガス発生時にはガス
の膨張作用などにより、オーガ軸7とオーガ羽根8の表
面に付着している土砂塊が浮き上がるように剥離する。In the process of driving the pile 6, the metal ring 6a, the steel rod 6b, and the auger blade 8 at the tip of the pile are underground. When a DC voltage having the above-mentioned polarity is applied to the auger blade 8 and the metal ring 6a existing in the ground with earth and sand therebetween, an electric current flows through the electrolyte solution in the earth and sand to cause an electrolysis reaction.
As a result, the negative pole of the auger blade 8 and the auger shaft 7
Hydrogen gas is generated from the surface of the underground part, and moisture in the earth and sand collects on the minus pole side. At the time of gas generation, the earth and sand mass adhering to the surfaces of the auger shaft 7 and the auger blade 8 are separated from the surface of the auger blade 8 so as to float due to the expansion action of the gas.
【0013】したがって、前記のように直流電源9によ
り通電しながら掘削と杭打込みを行えば、オーガ羽根8
の回転に対する土砂の抵抗力が小さい状態で掘削を円滑
に能率よく進めることができる。Therefore, if excavation and pile driving are performed while energizing the DC power source 9 as described above, the auger blade 8
Excavation can be smoothly and efficiently performed in a state where the resistance of the earth and sand to the rotation of the soil is small.
【0014】また杭打ちを終了した段階で、使用したオ
ーガ羽根8(オーガ軸7)を杭内に残置したままで他の
機械設備をベースマシン1とともに次の杭打ち場所へ移
動し、その間に打込んだ杭6の金属リング6aと残置し
たオーガ羽根8との間に前記の極性で適宜時間通電して
おく。その後、残置したオーガ羽根8をクレーンなどで
抜き取る際に、通電による前記の土砂付着防止効果が発
揮されて、オーガ羽根8に付着している土砂は容易に脱
落し、土砂の掻き取り除去作業が大幅に省力化される。When the pile driving is completed, the other mechanical equipment is moved to the next pile driving place together with the base machine 1 while the used auger blade 8 (auger shaft 7) remains in the pile. Electricity is supplied between the metal ring 6a of the driven pile 6 and the remaining auger blade 8 with the above-mentioned polarity for an appropriate time. Thereafter, when the remaining auger blade 8 is extracted with a crane or the like, the above-described effect of preventing the adhesion of the earth and sand by the energization is exerted, the earth and sand attached to the auger blade 8 easily falls off, and the work of scraping and removing the earth and sand is performed. Significant labor savings.
【0015】[0015]
【発明の効果】以上詳細に説明したように、この発明に
よれば、中掘り式杭打ち工法において打込む杭の金属部
材と掘削用オーガ羽根とに直流電圧を印加して地中で通
電するという簡単な設備で容易に実施できる手段によっ
て、掘削中のオーガ羽根に対する土砂の摩擦力、抵抗力
を大幅に減少させることができ、比較的小さなトルクで
円滑に能率よく掘削と杭打ちを進めることができる。掘
削土砂の排出処理時にも土砂塊が容易にオーガ羽根から
脱落するので、後処理の作業も非常に簡単になる。As described above in detail, according to the present invention, a DC voltage is applied to the metal member of the pile to be driven and the auger blade for excavation in the mid-digging type pile driving method, thereby energizing underground. By means of simple equipment that can be easily implemented, the frictional force and resistance of earth and sand against the auger blade during excavation can be greatly reduced, and drilling and pile driving can proceed smoothly and efficiently with relatively small torque. Can be. Even when the excavated earth and sand is discharged, the earth and sand mass easily falls off the auger blade, so that the post-processing work is also very simple.
【図1】この発明の一実施例による中掘り式杭打ち工法
の実施形態を示す図である。FIG. 1 is a view showing an embodiment of a middle digging type pile driving method according to an embodiment of the present invention.
【図2】同上実施例の要部詳細図である。FIG. 2 is a detailed view of a main part of the embodiment.
1 ベースマシン 2 支柱 3 オーガ駆動装置 4 杭圧入装置 5 杭頭部押え装置 6 PC杭 6a 金属リング 6b 鋼棒 7 オーガ軸 8 オーガ羽根 9 直流電源 10 リード線 11 スリップリング 12 ブラシ 13 リード線 DESCRIPTION OF SYMBOLS 1 Base machine 2 Prop 3 Auger drive 4 Pile press-in device 5 Pile head holding device 6 PC pile 6a Metal ring 6b Steel rod 7 Auger shaft 8 Auger blade 9 DC power supply 10 Lead wire 11 Slip ring 12 Brush 13 Lead wire
フロントページの続き (72)発明者 黒島 勇 東京都千代田区神田司町2丁目3番地 株式会社大林組東京本社内 (56)参考文献 特開 昭59−192129(JP,A) 特開 昭52−155808(JP,A) (58)調査した分野(Int.Cl.6,DB名) E02D 7/00Continuation of front page (72) Inventor Isamu Kuroshima 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo head office (56) References JP-A-59-192129 (JP, A) JP-A-52-155808 (JP, A) (58) Fields investigated (Int. Cl. 6 , DB name) E02D 7/00
Claims (1)
の既製杭を立設し、その杭の中空部の地盤をアースオー
ガにより掘削しながら杭を地中に沈設させる中掘り式杭
打ち工法において、杭打ち過程または杭打ち後の地中に
あるオーガ羽根と前記杭の金属部材との間に前記オーガ
羽根をマイナス極とし前記金属部材をプラス極として直
流電圧を印加して通電し、前記杭の中空部内の土砂に含
まれる電解質溶液を媒介として電気分解を生じさせて前
記オーガ羽根表面から水素ガスを発生させ、これによっ
てオーガ羽根と土砂との結合を弱めることを特徴とする
中掘り式杭打ち工法。1. A mid-digging type pile driving method in which a hollow prefabricated pile partially or entirely made of a metal member is erected, and the pile is submerged in the ground while excavating the ground in the hollow portion of the pile with an earth auger. In the pile driving process or between the metal member of the pile and the auger blade in the ground after the pile driving, the auger blade is a negative pole and the metal member is a positive pole, and a DC voltage is applied and energized, An inner digging method characterized in that electrolysis is caused by the electrolyte solution contained in the earth and sand in the hollow portion of the pile to generate hydrogen gas from the surface of the auger blade, thereby weakening the bond between the auger blade and the earth and sand. Pile driving method.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4085499A JP2848100B2 (en) | 1992-04-07 | 1992-04-07 | Underground pile driving method |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4085499A JP2848100B2 (en) | 1992-04-07 | 1992-04-07 | Underground pile driving method |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH05287739A JPH05287739A (en) | 1993-11-02 |
JP2848100B2 true JP2848100B2 (en) | 1999-01-20 |
Family
ID=13860630
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4085499A Expired - Lifetime JP2848100B2 (en) | 1992-04-07 | 1992-04-07 | Underground pile driving method |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2848100B2 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP7108495B2 (en) * | 2018-08-20 | 2022-07-28 | 株式会社技研製作所 | Construction tools and equipment |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59192129A (en) * | 1983-04-13 | 1984-10-31 | Zenitakagumi:Kk | Sheathing work |
-
1992
- 1992-04-07 JP JP4085499A patent/JP2848100B2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH05287739A (en) | 1993-11-02 |
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