JP2001303569A - Construction method for winged pile - Google Patents
Construction method for winged pileInfo
- Publication number
- JP2001303569A JP2001303569A JP2000121945A JP2000121945A JP2001303569A JP 2001303569 A JP2001303569 A JP 2001303569A JP 2000121945 A JP2000121945 A JP 2000121945A JP 2000121945 A JP2000121945 A JP 2000121945A JP 2001303569 A JP2001303569 A JP 2001303569A
- Authority
- JP
- Japan
- Prior art keywords
- pile
- steel pipe
- wing
- ground
- tip
- 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
Landscapes
- Placing Or Removing Of Piles Or Sheet Piles, Or Accessories Thereof (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、先端部又はその近
傍にねじ込み用の翼が設けられた翼付き杭の施工方法に
関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a winged pile provided with a wing for screwing at or near a tip end thereof.
【０００２】[0002]
【従来の技術】杭先端部又はその近傍にねじ込み用の翼
を設けた杭（以下、翼付き杭という）は、従来から多数
提案されており、その一部は実用化されている。この翼
付き杭は、杭体を回転することにより翼の木ネジとして
の作用により地盤中に貫入して埋設されるものであり、
低振動、低騒音、無排土で施工できること、及び翼の面
積を利用して大きな先端支持力を確保することができる
等の特徴を有する。2. Description of the Related Art Many piles provided with screwing blades at or near the tip of a pile (hereinafter referred to as "winged piles") have been proposed in the prior art, and some of them have been put to practical use. This winged pile penetrates into the ground by rotating the pile body and acting as a wood screw on the wing,
It has the features that it can be constructed with low vibration, low noise, no soil removal, and that a large tip supporting force can be secured using the area of the wing.
【０００３】[0003]
【発明が解決しようとする課題】翼付き杭は上記のよう
な特徴を有するが、最大の問題点は杭体を回転して地盤
中に貫入するために非常に大きなトルクを必要とするこ
とである。地盤中への貫入にあたっては、杭先端部が閉
塞されたものであれ、開放されたものであっても、杭先
端部が支持層に到達すると、翼と杭先端部は地盤から大
きな抵抗を受ける。そのため、一般に入手できる杭打ち
機と杭体回転用モータを使用すると、最大で外径が６０
０ｍｍ程度の杭にしか適用できないのが現状である。The winged pile has the above-mentioned features, but the biggest problem is that a very large torque is required to rotate the pile and penetrate into the ground. is there. When penetrating into the ground, whether the tip of the pile is closed or open, the wing and the tip of the pile receive great resistance from the ground when the tip of the pile reaches the support layer, even if it is open. . Therefore, if a commonly available pile driver and a pile rotation motor are used, the outer diameter can be up to 60 mm.
At present, it can only be applied to piles of about 0 mm.
【０００４】これ以上外径の大きな杭を施工する場合
は、非常に大きなトルクを発揮できる全旋回型掘削機を
使用せざるを得ないが、この機械による施工は、機械の
費用が非常に高くなるにかかわらず、施工能率が低下す
るという問題がある。また、大きなトルクをかけるた
め、杭として鋼管杭を使用する場合、設計上必要な厚さ
より厚い鋼管を使用せざるを得ない場合が多い。さら
に、捻りモーメントに弱いコンクリート杭には、翼付き
ねじ込み杭工法を適用できないという基本的な問題もあ
る。When piles having a larger outside diameter are to be constructed, it is inevitable to use a full-rotation type excavator capable of exerting a very large torque. However, construction with this machine is very expensive. Regardless, construction efficiency is reduced. In addition, when a steel pipe pile is used as a pile to apply a large torque, it is often necessary to use a steel pipe thicker than required in design. Furthermore, there is a fundamental problem that a screwed pile method with wings cannot be applied to concrete piles that are vulnerable to torsional moment.
【０００５】また、翼により翼下面の地盤がかき乱され
るため、支持層本来の支持力を発揮できないという問題
もある。さらに、設計上の問題として、杭として供用時
に翼には大きな地盤反力が作用するため、翼径が大きく
なると翼に作用する曲げモーメントが大きくなって、翼
の厚さが非常に厚くなるとともに、杭体に伝達するモー
メントも大きくなるという問題もあり、これはコスト上
大きな問題点となっている。[0005] Further, there is another problem that the ground on the lower surface of the wing is disturbed by the wing, so that the support force inherent in the support layer cannot be exhibited. Furthermore, as a design problem, a large ground reaction force acts on the wing during operation as a pile, so as the wing diameter increases, the bending moment acting on the wing increases, and the thickness of the wing becomes extremely thick. However, there is also a problem that the moment transmitted to the pile body is increased, which is a major problem in terms of cost.
【０００６】本発明は、上記のような課題を解決するた
めになされたもので、次のような翼付き杭の施工方法を
提供することを目的としたものである。 （１）小さなトルクで大径の翼付き杭を施工できるこ
と。 （２）支持層本来の支持力を発揮できること。 （３）供用時に翼に発生するモーメントを小さくするこ
と。The present invention has been made to solve the above-mentioned problems, and has as its object to provide the following method of constructing a winged pile. (1) A large-diameter winged pile can be constructed with a small torque. (2) The original support force of the support layer can be exhibited. (3) To reduce the moment generated on the wing during operation.
【０００７】[0007]
【課題を解決するための手段】本発明に係る翼付き杭の
施工方法は、先端部又は先端部近傍にねじ込み用の翼が
設けられた中空の杭を回転して地盤中に埋設する施工方
法において、杭の埋設開始時又は埋設の途中から前記中
空部に挿入したロッドの先端部又は先端部近傍に設けた
ノズルから水又は自硬性流動体からなる流体を高圧噴射
して地盤を掘削軟化すると共に、支持層に前記自硬性流
動体を噴射して掘削した地盤と混合し、翼を含む杭先端
部近傍を前記混合体の中に設置するようにしたものであ
る。According to the present invention, there is provided a method of constructing a pile with wings according to the present invention, the method comprising the steps of: rotating a hollow pile provided with a wing for screwing at a tip or in the vicinity of the tip; At the time of starting the burial of the pile or during the burial, from the nozzle provided at or near the tip of the rod inserted into the hollow part, water or a fluid composed of a self-hardening fluid is injected at high pressure to excavate and soften the ground. At the same time, the self-hardening fluid is injected into the support layer and mixed with the excavated ground, and the vicinity of the tip of the pile including the wing is set in the mixture.
【０００８】また、上記のロッドの先端部又は先端部近
傍に複数のノズルを設け、これらノズルを該ノズルから
噴射される流体が杭の中心部近傍から杭の外周付近まで
分布するように配置した。Further, a plurality of nozzles are provided at or near the tip of the rod, and these nozzles are arranged so that the fluid ejected from the nozzles is distributed from near the center of the pile to near the outer periphery of the pile. .
【０００９】さらに、上記の翼の外縁又はその近傍にノ
ズルから噴射された流体を跳ね返す返し部材を設けた。
また、上記のロッドを杭の回転方向と反対方向に回転さ
せるようにした。Further, a return member for repelling the fluid jetted from the nozzle is provided at or near the outer edge of the wing.
Further, the rod is rotated in a direction opposite to the rotation direction of the pile.
【００１０】[0010]
【発明の実施の形態】［実施の形態１］図１は本発明の
実施の形態１の説明図である。図において、１は先端部
に翼２が設けられた中空の翼付き杭を構成する鋼管杭
（以下、単に杭と記すことがある）で、翼２の中心部に
は開口部３が設けられいる。翼２は、例えば鋼管杭１の
先端部に複数の段部を設け、これら段部の下端部と隣接
する段部の上端部とを結んで傾斜面からなるレ字状の取
付部を形成し、この取付部にドーナツ状の鋼板を複数に
分割して形成した平板状の鋼製翼を溶接によって取付
け、あるいは、鋼管杭１の先端部に設けた段部の下端部
から１周して上端部に至るレ字状の取付部に、ドーナツ
状の鋼板を曲げ加工して形成した螺旋状翼を取付けて構
成してもよい。さらに、上述の鋼製翼又は螺旋状翼を鋼
管杭１の先端部近傍の外周に取付けて鋼管杭１の先端開
口部を開放するなど、その形状、構造、取付位置は適宜
選択することができる。[First Embodiment] FIG. 1 is an explanatory view of a first embodiment of the present invention. In the figure, reference numeral 1 denotes a steel pipe pile (hereinafter, may be simply referred to as a pile) constituting a hollow winged pile having a wing 2 provided at a tip portion, and an opening 3 is provided at the center of the wing 2. I have. The wing 2 is provided with a plurality of steps, for example, at the tip of the steel pipe pile 1 and connects the lower end of these steps and the upper end of an adjacent step to form a ridge-shaped mounting portion consisting of an inclined surface. A flat steel wing formed by dividing a donut-shaped steel plate into a plurality of parts is attached to the mounting part by welding, or the steel pipe pile 1 is turned around once from a lower end part of a stepped part provided at a tip end thereof, and is then upper end. A helical wing formed by bending a donut-shaped steel plate may be attached to a V-shaped attachment portion leading to the portion. Further, the shape, structure, and mounting position of the steel wing or spiral wing can be appropriately selected, such as mounting the steel wing or spiral wing on the outer periphery near the front end of the steel pipe pile 1 to open the front end opening of the steel pipe pile 1. .
【００１１】１１は先端部に複数のノズルを有するノズ
ルヘッダ１２が設けられ、鋼管杭１の中空部内に先端部
が翼２の開口部３から下方に位置するまで挿入されたロ
ッドで、中心部の軸方向にはノズルヘッダ１２に連通す
る貫通穴（図示せず）が設けられており、その上部は鋼
管杭１の杭頭部に着脱可能に固定されている。Reference numeral 11 denotes a rod provided with a nozzle header 12 having a plurality of nozzles at its tip, and inserted into the hollow portion of the steel pipe pile 1 until the tip is located below the opening 3 of the wing 2. A through hole (not shown) communicating with the nozzle header 12 is provided in the axial direction, and the upper portion thereof is detachably fixed to the pile head of the steel pipe pile 1.
【００１２】２１は杭打ち機２０に搭載された可逆に回
転するオーガーモータで、その回転軸は鋼管杭１の杭頭
部に着脱可能に連結される。２５は地表３５上に設置さ
れた貯水タンク、２６は例えばセメントミルクや薬液注
入材等からなる自硬性流動体を製造するプラント、２７
は高圧ポンプで、貯水タンク２５と高圧ポンプ２７とは
第１の管路２８で連結されており、また、プラント２６
と高圧ポンプ２７とは第２の管路２９で連結されてい
る。そして、第１、第２の管路２８，２９は例えば閉塞
位置を含む三方切換弁３０により切換接続される。３１
は一端が高圧ポンプ２７の吐出口に接続され、他端が回
転自在にロッド１１に接続されたホースである。Numeral 21 denotes a reversibly rotating auger motor mounted on the pile driver 20, and its rotation shaft is detachably connected to the pile head of the steel pipe pile 1. 25 is a water storage tank installed on the ground surface 35, 26 is a plant for producing a self-hardening fluid composed of, for example, cement milk or a chemical injection material, 27
Is a high-pressure pump, and the water storage tank 25 and the high-pressure pump 27 are connected by a first pipe 28.
The high pressure pump 27 and the high pressure pump 27 are connected by a second pipe line 29. The first and second conduits 28 and 29 are switched and connected by a three-way switching valve 30 including a closed position, for example. 31
Is a hose having one end connected to the discharge port of the high-pressure pump 27 and the other end rotatably connected to the rod 11.
【００１３】次に、上記のような本実施の形態の施工手
順の一例について説明する。 （１）図２（ａ）に示すように、ロッド１１が挿入され
た鋼管杭１の杭頭部をオーガーモータ２１の回転軸に連
結すると共に、三方切換弁３０により第１の管路２８を
介して貯水タンク２５を高圧ポンプ２７に接続する。こ
の状態で地表３５から支持層３６の手前までの区間は、
鋼管杭１を回転すると共に、鋼管杭１と一体に回転する
ロッド１１のノズルヘッダ１２から高圧ポンプ２７によ
って圧送された水を噴射し、翼２の木ネジ作用により鋼
管杭１を地盤中に貫入する。Next, an example of the construction procedure of the present embodiment as described above will be described. (1) As shown in FIG. 2 (a), the pile head of the steel pipe pile 1 in which the rod 11 is inserted is connected to the rotation shaft of the auger motor 21, and the first conduit 28 is connected by the three-way switching valve 30. The water storage tank 25 is connected to the high-pressure pump 27 via the high-pressure pump 27. In this state, the section from the ground surface 35 to just before the support layer 36 is
While rotating the steel pipe pile 1, water pumped by the high-pressure pump 27 is injected from the nozzle header 12 of the rod 11 that rotates integrally with the steel pipe pile 1, and the steel pipe pile 1 penetrates into the ground by the wood screw action of the wing 2. I do.
【００１４】噴射した水は高圧のため翼２の回転に伴っ
て地盤を掘削し、軟化（泥状化）して鋼管杭１は小さい
トルクでスムーズに地盤中に貫入される。そして、泥状
化された土砂３７の大部分は翼２の上部（鋼管杭１の外
周）に移動し、一部の土砂３７は鋼管杭１内に侵入す
る。施工中の鋼管杭１の先端部の状態を図４に示す。な
お、１４はロッド１１の位置を鋼管杭１の中心部に保持
するためのロッド位置保持金具である。Due to the high pressure of the injected water, the ground is excavated with the rotation of the wings 2 and softened (muddy), and the steel pipe pile 1 is smoothly penetrated into the ground with a small torque. Most of the muddy soil 37 moves to the upper part of the wing 2 (the outer periphery of the steel pipe pile 1), and a part of the soil 37 enters the steel pipe pile 1. FIG. 4 shows the state of the tip of the steel pipe pile 1 during construction. Reference numeral 14 denotes a rod position holding bracket for holding the position of the rod 11 at the center of the steel pipe pile 1.
【００１５】（２）鋼管杭１の先端部が支持層３６に達
したときは、図２（ｂ）に示すように（図２（ｂ）に
は、杭打ち機は省略してある）、三方切換弁３０により
ノズルヘッダ１２から噴射される水を自硬性流動体に切
換える。そして、ノズルヘッダ１２から自硬性流動体を
噴射させて鋼管杭１の予定設定深度より下方の地盤まで
掘削・軟化させると共に、引続き鋼管杭１を回転させて
泥状化した土砂と自硬性流動物とを攪拌混合させる。(2) When the tip of the steel pipe pile 1 reaches the support layer 36, as shown in FIG. 2B (pile driver is omitted in FIG. 2B). The water injected from the nozzle header 12 is switched to the self-hardening fluid by the three-way switching valve 30. Then, a self-hardening fluid is injected from the nozzle header 12 to excavate and soften the ground below the predetermined depth of the steel pipe pile 1, and the steel pipe pile 1 is continuously rotated to make muddy soil and self-hardening fluid. Are mixed with stirring.
【００１６】（３）鋼管杭１が最終深度に達したとき
は、三方切換弁３０により自硬性流動体の噴射を停止
し、図３（ａ）に示すように（図３（ａ），（ｂ）に
は、杭打ち機、高圧ポンプ等は省略してある）、鋼管杭
１を逆回転して予定設置深度まで引上げる。なお、自硬
性流動体を噴射しながら鋼管杭１を引上げてもよい。(3) When the steel pipe pile 1 reaches the final depth, the injection of the self-hardening fluid is stopped by the three-way switching valve 30, and as shown in FIG. 3A (FIGS. 3A and 3A). In b), a pile driver, a high-pressure pump, and the like are omitted), and the steel pipe pile 1 is reversely rotated to be pulled up to a planned installation depth. The steel pipe pile 1 may be pulled up while injecting the self-hardening fluid.
【００１７】（４）ついで、オーガーモータ２１の回転
軸と鋼管杭１との連結を外してロッド１１をオーガーモ
ータ２１に連結し、図３（ｂ）に示すように、鋼管杭１
を地盤中に残置した状態でロッド１１を引上げれば、施
工が完了する。施工完了後の鋼管杭１の先端部の状態を
図５に示す。図から明らかなように、翼２を含む鋼管杭
１の下部及び外周、さらに鋼管杭１内は、土砂と自硬性
流動体の混合物が固化した固化体３８によって強固に固
められるため、支持層本来の先端支持力を確保すること
ができる。また、鋼管杭１の周囲に移動した土砂３７も
圧縮されて大きな周面摩擦力を発揮する。(4) Then, the rod 11 is connected to the auger motor 21 by disconnecting the rotating shaft of the auger motor 21 and the steel pipe pile 1, and as shown in FIG.
The construction is completed by pulling up the rod 11 in a state where is left in the ground. FIG. 5 shows the state of the tip of the steel pipe pile 1 after the completion of the construction. As is apparent from the figure, the lower part and outer periphery of the steel pipe pile 1 including the wings 2 and the inside of the steel pipe pile 1 are firmly solidified by the solidified material 38 in which the mixture of earth and sand and the self-hardening fluid is solidified. Can support the tip. In addition, the earth and sand 37 moved around the steel pipe pile 1 is also compressed and exerts a large peripheral friction force.
【００１８】以上本実施の形態の施工手順の一例につい
て説明したが、これに限定するものではなく、例えば次
のような手順によって施工してもよい。 （１）自硬性流体を噴射する範囲は支持層３６だけでな
く、例えば鋼管杭１の全長あるいは先端部から全長の２
分の１程度上方までの範囲になど、適宜設定することが
できる。この場合、鋼管杭１の周囲の地盤も自硬性流体
の作用で時間とともに硬化し、より大きな周面摩擦力を
確保することができる。 （２）鋼管杭１を回転するためのトルクがきわめて小さ
い区間はノズルヘッダ１２からの水又は自硬性流動体の
噴射を行わず、硬い地盤に達してからこれを噴射しても
よい。Although an example of the construction procedure according to the present embodiment has been described above, the invention is not limited to this, and the construction may be performed according to the following procedure, for example. (1) The range in which the self-hardening fluid is injected is not limited to the support layer 36, but may be, for example, the entire length of the steel pipe pile 1 or 2
It can be set as appropriate, such as in a range up to about one-half. In this case, the ground around the steel pipe pile 1 is also hardened with time by the action of the self-hardening fluid, and a larger circumferential friction force can be secured. (2) In the section where the torque for rotating the steel pipe pile 1 is extremely small, water or self-hardening fluid may not be injected from the nozzle header 12 but may be injected after reaching the hard ground.
【００１９】（３）鋼管杭１が最終深度に達するまで水
だけてで地盤を掘削・硬化したのち、鋼管杭１を引き上
げながら自硬性流動体を噴射し、泥状化した土砂と攪拌
混合してもよい。 （４）土砂と自硬性流動体の混合物の固化体３８と、鋼
管杭１との付着を増すために、あらかじめ鋼管杭先端部
近傍の内面や外面に、鉄筋を巻くなどの付着増強措置を
講じてもよい。 （５）掘削効率を高めるために、水又は自硬性流動体中
に空気を混入させてもよい。 （６）また、ノズルヘッダ１２自体に地盤掘削機能をも
たせるために、掘削刄を設けてもよい。(3) After excavating and hardening the ground with only water until the steel pipe pile 1 reaches the final depth, the self-hardening fluid is injected while pulling up the steel pipe pile 1 and mixed with the muddy soil by stirring. You may. (4) In order to increase the adhesion between the solidified body 38 of the mixture of earth and sand and the self-hardening fluid and the steel pipe pile 1, adhesion reinforcement measures such as winding a reinforcing bar are taken in advance on the inner surface and the outer surface near the tip of the steel pipe pile. You may. (5) Air may be mixed into the water or the self-hardening fluid to increase the excavation efficiency. (6) Further, an excavation blade may be provided in order to provide the nozzle header 12 itself with a ground excavation function.
【００２０】上記のように構成した本実施の形態におい
ては、次のような効果を得ることができる。 （１）水又は自硬性流動体の高圧噴射により地盤が泥状
化するため、翼２及び鋼管杭１の先端部が地盤から受け
る抵抗が大幅に減少し、小さいトルクで鋼管杭１を回転
し地盤中にねじ込み貫入することができる。 （２）翼２の下方の地盤の乱れは自硬性流動体により固
められるため、支持層本来の先端支持力を確保すること
ができる。In the embodiment configured as described above, the following effects can be obtained. (1) Since the ground is muddy due to high-pressure injection of water or self-hardening fluid, the resistance of the wing 2 and the tip of the steel pipe pile 1 received from the ground is greatly reduced, and the steel pipe pile 1 is rotated with a small torque. It can be screwed and penetrated into the ground. (2) The turbulence of the ground below the wings 2 is solidified by the self-hardening fluid, so that the original support force at the tip of the support layer can be secured.
【００２１】（３）供用時に、土砂と自硬性流動体との
固化体３８と翼２を含む鋼管杭先端部近傍の内外面との
付着力が大きく、杭先端部、翼２及び固化体３８の３者
が一体として挙動するため、杭先端部に伝達された鉛直
荷重の一部は、固化体３８から直接鋼管杭１に伝達され
る。このため、翼２に作用する地盤反力が減少して翼２
の曲げモーメントが小さくなり、その結果、翼２の厚さ
を低減することができると共に、鋼管杭１に伝達される
曲げモーメントも小さくなる。(3) At the time of operation, the adhesion between the solidified body 38 of earth and sand and the self-hardening fluid and the inner and outer surfaces near the tip of the steel pipe pile including the wing 2 is large, and the pile tip, the wing 2 and the solidified body 38 Therefore, part of the vertical load transmitted to the pile tip is directly transmitted from the solidified body 38 to the steel pipe pile 1. For this reason, the ground reaction force acting on the wing 2 is reduced, and the wing 2
, The thickness of the blade 2 can be reduced, and the bending moment transmitted to the steel pipe pile 1 also decreases.
【００２２】［実施の形態２］図６は本発明の実施の形
態２の鋼管杭及びロッドの先端部近傍の説明図である。
本実施の形態においては、翼２は鋼管杭１の先端部近傍
の外周に取付けられており、鋼管部１の先端開口部は開
放されている。また、ロッド１の先端部に設けたノズル
ヘッダ１２には４個のノズル１３ａ，１３ｂが設けられ
ており、そのうち２個のノズル１３ａは杭断面の斜め下
方に向って噴射し、他の２個のノズル１３ｂは翼２の下
方において横方向に噴射するようになっている。[Embodiment 2] FIG. 6 is an explanatory view showing the vicinity of the tip of a steel pipe pile and a rod according to Embodiment 2 of the present invention.
In the present embodiment, the wing 2 is attached to the outer periphery near the tip of the steel pipe pile 1, and the tip opening of the steel pipe 1 is open. The nozzle header 12 provided at the tip of the rod 1 is provided with four nozzles 13a and 13b, of which two nozzles 13a inject diagonally downward in the cross section of the pile and the other two nozzles 13a. The nozzle 13b is configured to jet horizontally below the blade 2.
【００２３】水や自硬性流動体（以下、両者を合せて単
に流体ということがある）を高圧噴射し、地盤を泥状化
して翼により掘削する場合、長い距離を掘削するために
は非常に高い圧力が必要である。特に、支持層の掘削の
ためには２００kg/cm2を超える超高圧に高めなければな
らない。例えば、圧力２００kg/cm2で噴射しても５０mc
離れた位置では数kg/cm2の圧力に低下してしまう。その
ため、長い距離を掘削するためには、高圧ポンプを大型
化すると共に、ホースやロッドの継手部、ノズルなどの
部品を非常に精巧なものにしなければならず、その結
果、初期コストだけでなく保守管理コストも高価にな
る。When excavating with a wing with muddy ground by injecting water or self-hardening fluid (hereinafter, the two may be simply referred to as a fluid), it is very difficult to excavate a long distance. High pressure is required. In particular, for excavation of the support layer, the pressure must be increased to an extremely high pressure exceeding 200 kg / cm 2 . For example, 50 mC be injected at a pressure 200 kg / cm 2
At a distant position, the pressure drops to several kg / cm 2 . Therefore, in order to excavate a long distance, it is necessary to increase the size of the high-pressure pump and to make components such as hoses, rod joints, nozzles, and the like very sophisticated, and as a result, not only initial cost but also Maintenance costs are also high.
【００２４】本実施の形態は、ノズルヘッダ１２に設け
た複数のノズル１３ａ，１３ｂの設置位置を、噴射する
流体が杭中心部近傍から杭外周付近まで分布しうるよう
にしたので、個々のノズル１３ａ，１３ｂの噴流（噴射
した流体の流れ）の到達距離が短かくても、杭と翼の下
部全体を容易に掘削、軟化することができる。このよう
に、本実施の形態においては、ノズルヘッダ１２に設け
たノズル１３ａ，１３ｂの位置を調整することにより、
流体の圧力を低下しうるようにしたものである。なお、
本実施の形態における鋼管杭の施工手順は、実施の形態
１の場合と同様である。In the present embodiment, the installation positions of the plurality of nozzles 13a and 13b provided in the nozzle header 12 are set such that the fluid to be sprayed can be distributed from the vicinity of the center of the pile to the vicinity of the periphery of the pile. Even if the reach of the jets 13a and 13b (the flow of the injected fluid) is short, the entire lower part of the pile and the wing can be easily excavated and softened. As described above, in the present embodiment, by adjusting the positions of the nozzles 13a and 13b provided on the nozzle header 12,
The pressure of the fluid can be reduced. In addition,
The construction procedure of the steel pipe pile according to the present embodiment is the same as that of the first embodiment.
【００２５】［実施の形態３］図７は本発明の実施の形
態３の鋼管杭及びロッドの先端部近傍の説明図である。
本実施の形態は、実施の形態２の翼２の外縁の流体の噴
射位置に対応した位置に、噴流を跳ね返すための鋼材か
らなる返し部材１５をほぼ鉛直方向に設けたもので、ノ
ズルヘッダ１２の横方向に設けたノズル１３ｂはこの返
し部材１５をめがけて流体を噴射する。[Embodiment 3] FIG. 7 is an explanatory view showing the vicinity of the tip of a steel pipe pile and a rod according to Embodiment 3 of the present invention.
In the present embodiment, a return member 15 made of a steel material for repelling a jet is provided substantially vertically at a position corresponding to the fluid injection position on the outer edge of the blade 2 of the second embodiment. The nozzle 13b provided in the lateral direction of the above ejects fluid toward the return member 15.
【００２６】流体の噴流による地盤掘削工法において
は、地盤の硬さや土質の性状の違いにより噴流の到達距
離に大きな差が生じる。噴流の到達距離を一定にするた
めには地盤の性状に応じて流体の圧力を調整すればよい
が、地中のため確認できない。このため、掘削予定範囲
を確実に掘削するために、流体の圧力を高めに設定す
る。その結果、予想よりも軟らかい地盤や崩しやすい土
質の位置では掘削予定範囲の外まで掘削してしまい、地
盤の支持力の低下を招くことになる。In the ground excavation method using a fluid jet, there is a large difference in the reach of the jet due to differences in the hardness of the ground and the properties of the soil. In order to keep the reach of the jet constant, the pressure of the fluid may be adjusted according to the properties of the ground, but it cannot be confirmed because it is underground. For this reason, the pressure of the fluid is set to be high in order to reliably excavate the planned excavation range. As a result, if the ground is softer than expected or the soil is easily collapsed, the ground is excavated to the outside of the planned excavation range, and the bearing capacity of the ground is reduced.
【００２７】本実施の形態によれば、翼２の外縁に噴流
の返し部材１５を設けたことにより、掘削範囲を制御し
て地盤の支持力を確保することができる。なお、実施の
形態における鋼管杭の施工手順も実施の形態１の場合と
同様である。According to this embodiment, by providing the jet return member 15 at the outer edge of the wing 2, the excavation range can be controlled to secure the ground support force. In addition, the construction procedure of the steel pipe pile in the embodiment is the same as that in the case of the first embodiment.
【００２８】［実施の形態４］図８は本発明の実施の形
態４の説明図である。本実施の形態は、杭打ち機２０に
搭載したオーガーモータ２１に、互いに独立して反対方
向に回転する外軸２２と内軸２３を設け、外軸２２を鋼
管杭１の杭頭部に連結すると共に、内軸２３にロッド１
１を連結したもので、施工にあたっては鋼管杭１とロッ
ド１１を反対方向に回転させて地盤中に貫入するように
したものである。[Embodiment 4] FIG. 8 is an explanatory diagram of Embodiment 4 of the present invention. In this embodiment, an auger motor 21 mounted on a pile driver 20 is provided with an outer shaft 22 and an inner shaft 23 that rotate independently and in opposite directions, and connects the outer shaft 22 to a pile head of the steel pipe pile 1. And the rod 1
In the construction, the steel pipe pile 1 and the rod 11 are rotated in opposite directions to penetrate the ground.
【００２９】本実施の形態は上記のように構成したの
で、施工にあたっては、ノズルヘッダ１２から噴射した
自硬性流動体と、掘削軟化した土砂とが効率よく練りか
えされて均一な混合物を造ることができ、その結果、よ
り大きな支持力を得ることができる。本実施の形態の施
工手順も、鋼管杭１とロッド１１を反対方向に回転させ
る以外は、実施の形態１の場合とほぼ同様である。Since the present embodiment is configured as described above, the self-hardening fluid injected from the nozzle header 12 and the excavated softened earth and sand are efficiently kneaded to form a uniform mixture. As a result, a larger supporting force can be obtained. The construction procedure of this embodiment is almost the same as that of the first embodiment except that the steel pipe pile 1 and the rod 11 are rotated in opposite directions.
【００３０】［実施例］次に、実施の形態３に係る鋼管
杭１とロッド１１による本発明の施工方法の実施例につ
いて説明する。 （１）翼付き杭：先端部が開放された外径１０００mm、
厚さ１６mm、長さ２３ｍの鋼管杭１の先端部外周に、外
径１６００mmの螺旋状翼２を溶接により取付けた。そし
て、螺旋状翼２の外縁のノズルヘッダ１２の流体を横方
向に噴射するノズル１３ｂと対向する位置に、鋼材片か
らなる返し部材１５を設けた。[Example] Next, an example of the construction method of the present invention using the steel pipe pile 1 and the rod 11 according to the third embodiment will be described. (1) Pile with wings: Outer diameter 1000 mm with open end,
A spiral wing 2 having an outer diameter of 1600 mm was attached to the outer periphery of the tip of a steel pipe pile 1 having a thickness of 16 mm and a length of 23 m by welding. Then, a return member 15 made of a steel piece was provided at a position on the outer edge of the spiral blade 2 opposite to the nozzle 13b for ejecting the fluid in the nozzle header 12 in the lateral direction.
【００３１】（２）ロッド：外径２１０mm、長さ２４ｍ
の鋼管の先端部に、流体を横方向に噴射する左右一対の
ノズル１３ｂと、流体を斜め下方に噴射する２個のノズ
ル１３ａを有するノズルヘッダ１２を取付けた。(2) Rod: outer diameter 210 mm, length 24 m
A nozzle header 12 having a pair of left and right nozzles 13b for injecting a fluid in the lateral direction and two nozzles 13a for injecting the fluid obliquely downward is attached to the tip of the steel pipe.
【００３２】（３）施工設備：鋼管杭１を回転するモー
タは、単軸で最大トルク２５ｔ・ｍのオーガーモータを
使用した。また、流体を圧送するポンプには最高圧力２
００kg/cm2の高圧ポンプを用い、その近傍にセメントミ
ルクを製造するプラント及び貯水タンクを設置し、プラ
ントと貯水タンクを三方切換弁を介して管路で接続し
た。（４）地盤：支持層より上の地盤（地表からの深さ
２０．５ｍ）はＮ値１０前後の粘性土、支持層はＮ値が
５０を超える砂礫。(3) Construction equipment: A single-axis auger motor having a maximum torque of 25 t · m was used as a motor for rotating the steel pipe pile 1. In addition, the pump that pumps the fluid has a maximum pressure of 2
Using a high-pressure pump of 00 kg / cm 2 , a plant for producing cement milk and a water storage tank were installed in the vicinity thereof, and the plant and the water storage tank were connected by a pipe via a three-way switching valve. (4) Ground: The ground above the support layer (20.5 m depth from the ground surface) is cohesive soil with an N value of around 10, and the support layer is gravel with an N value of more than 50.
【００３３】施工にあたっては、ロッド１１の上端部を
鋼管杭１の杭頭部に連結し、鋼管杭１の杭頭部をオーガ
ーモータ２１の回転軸に連結した。ついで、一端が高圧
ポンプ２９の吐出口に接続されたホース３１の他端をロ
ッド１１に接続し、三方切換弁３０を貯水タンク２２に
切換接続した。そして、地表３５から支持層の１ｍ手前
までの区間は、圧力５０kg/cm2でノズルヘッダ１２から
水を噴射しながらロッド１１と共に鋼管杭１を回転し、
貫入した。At the time of construction, the upper end of the rod 11 was connected to the pile head of the steel pipe pile 1, and the pile head of the steel pipe pile 1 was connected to the rotation shaft of the auger motor 21. Next, the other end of the hose 31 whose one end was connected to the discharge port of the high-pressure pump 29 was connected to the rod 11, and the three-way switching valve 30 was switched and connected to the water storage tank 22. In the section from the ground surface 35 to 1 m before the support layer, the steel pipe pile 1 is rotated together with the rod 11 while spraying water from the nozzle header 12 at a pressure of 50 kg / cm 2 ,
Penetrated.
【００３４】ついで、予定設置深度から１ｍ下までの区
間は、三方切換弁をプラント側に切換えて、圧力１５０
kg/cm2でノズルヘッダ１２からセメントミルクを噴射
し、引続いて鋼管杭１を回転し、貫入した。そして、鋼
管杭１の先端部が所定深度に達したときは、鋼管杭１を
逆回転し、セメントミルクを噴射しながら予定装置深度
まで引上げ、ついで三方切換弁を閉じてセメントミルク
の噴射を中止する。ついで、鋼管杭１をオーガーモータ
２１から取外すと共にロッド１１をオーガーモータ２１
に連結し、鋼管杭１を地盤中に残置した状態でロッド１
１を引上げた。Next, in the section 1 m below the planned installation depth, the three-way switching valve is switched to the plant side and the pressure 150
Cement milk was sprayed from the nozzle header 12 at kg / cm 2 , and subsequently, the steel pipe pile 1 was rotated and penetrated. Then, when the tip of the steel pipe pile 1 reaches a predetermined depth, the steel pipe pile 1 is rotated in the reverse direction, and the cement milk is pulled up to a predetermined device depth while spraying the cement milk. Then, the three-way switching valve is closed to stop the injection of the cement milk. I do. Next, the steel pipe pile 1 is removed from the auger motor 21 and the rod 11 is connected to the auger motor 21.
To the rod 1 with the steel pipe pile 1 remaining in the ground.
1 has been raised.
【００３５】上述のような手順により翼付き杭（鋼管
杭）を地盤中に埋設したところ、鋼管杭１を小さいトル
クでスムーズに貫入することができ、また、埋設した鋼
管杭１は固化したセメントミルクと土砂との固化体３８
により、大きな先端支持力を確保することができた。When the winged pile (steel pipe pile) is buried in the ground according to the above-described procedure, the steel pipe pile 1 can penetrate smoothly with a small torque, and the buried steel pipe pile 1 is solidified cement. Solidified body 38 of milk and earth and sand
As a result, a large tip supporting force could be secured.
【００３６】[0036]
【発明の効果】本発明に係る翼付き杭の施工方法は、杭
の埋設開始時又は埋設の途中から中空部に挿入したロッ
ドの先端部又は先端部近傍に設けたノズルから水又は自
硬性流動体からなる流体を高圧噴射して地盤を掘削軟化
すると共に、支持層に自硬性流動体を噴射して掘削した
地盤と混合し、翼を含む杭先端部近傍を混合体の中に設
置するようにしたので、最大トルクは小さいが容易に入
手できる回転用のモータにより、大径の翼付き杭を能率
良く地中にねじ込み施工することができ、工費も安くな
る。また、施工中は杭と翼の下の地盤が乱れるが、自硬
性流動体によって固化されるため、支持層本来の地盤支
持力を確保することができる。さらに、杭が鉛直荷重を
受けると、杭先端部近傍、翼及び固化体が一体として挙
動するため、翼に荷重が集中せず、その結果、杭先端部
近傍や翼の厚さを低減することができ、杭材料のコスト
を低減できる。According to the method for constructing a winged pile according to the present invention, water or self-hardening fluid flows from a nozzle provided at or near the tip of a rod inserted into the hollow part at the start of burial or during burial. Inject the fluid consisting of the body at high pressure to excavate and soften the ground, and inject the self-hardening fluid into the support layer to mix it with the excavated ground, and install the vicinity of the pile tip including the wing in the mixture. Therefore, a large-diameter winged pile can be efficiently screwed into the ground with a rotation motor having a small maximum torque but easily available, and the construction cost can be reduced. In addition, the ground under the pile and the wing is disturbed during the construction, but is solidified by the self-hardening fluid, so that the original ground support force of the support layer can be secured. Furthermore, when a pile receives a vertical load, the vicinity of the tip of the pile, the wing and the solidified body behave as a unit, so that the load does not concentrate on the wing, and as a result, the thickness of the vicinity of the tip of the pile and the thickness of the wing are reduced. And the cost of pile material can be reduced.
【００３７】また、上記のロッドの先端部に設けたノズ
ルヘッダに複数のノズルを設け、これらノズルをノズル
から噴射される流体が杭の中心部近傍から杭の外周付近
まで分布するように配置したので、比較的低い流体圧力
で、杭と翼の下部全体を容易に掘削軟化することができ
る。A plurality of nozzles are provided on the nozzle header provided at the tip of the rod, and these nozzles are arranged so that the fluid ejected from the nozzles is distributed from near the center of the pile to near the outer periphery of the pile. Therefore, the entire lower part of the pile and the wing can be easily excavated and softened at a relatively low fluid pressure.
【００３８】さらに、上記の翼の外縁又はその近傍にノ
ズルから噴射された流体を跳ね返す返し部材を設けたの
で、予定範囲外の地盤を掘削、軟化させることがないた
め、本来の地盤支持力を確保することができる。Further, since a return member for repelling the fluid jetted from the nozzle is provided at or near the outer edge of the wing, the ground outside the predetermined range is not excavated and softened, so that the original ground support force is reduced. Can be secured.
【００３９】また、上記のロッドを杭の回転方向と反対
方向に回転させるようにしたので、掘削軟化した土砂と
自硬性流動物体とが効率よく練りかえされて均一な混合
物を造るとができ、これにより、より大きな地盤支持力
を得ることができる。Further, since the rod is rotated in the direction opposite to the rotation direction of the pile, the excavated softened earth and sand and the self-hardening fluid body can be efficiently kneaded to form a uniform mixture. Thereby, a larger ground support force can be obtained.
【図１】本発明の実施の形態１の説明図である。FIG. 1 is an explanatory diagram of Embodiment 1 of the present invention.
【図２】実施の形態１の施工手順の説明図である。FIG. 2 is an explanatory diagram of a construction procedure according to the first embodiment.
【図３】実施の形態１の施工手順の説明図である。FIG. 3 is an explanatory diagram of a construction procedure according to the first embodiment.
【図４】図２の施工中の杭先端部の状態を示す説明図で
ある。FIG. 4 is an explanatory view showing a state of a pile tip during construction in FIG. 2;
【図５】図３の施工後の杭先端部の状態を示す説明図で
ある。FIG. 5 is an explanatory view showing a state of a pile tip after the construction in FIG.
【図６】本発明の実施の形態２の鋼管杭及びロッドの先
端部近傍の説明図である。FIG. 6 is an explanatory view showing the vicinity of a tip of a steel pipe pile and a rod according to a second embodiment of the present invention.
【図７】本発明の実施の形態３の鋼管杭及びロッドの先
端部近傍の説明図である。FIG. 7 is an explanatory view of the vicinity of a tip of a steel pipe pile and a rod according to a third embodiment of the present invention.
【図８】本発明の実施の形態４の説明図である。FIG. 8 is an explanatory diagram of Embodiment 4 of the present invention.
１ 鋼管杭（翼付き杭） ２ 翼 ３ 開口部 １１ ロッド １２ ノズルヘッダ １３ａ，１３ｂ ノズル ２０ 杭打ち機 ２１ オーガーモータ ２５ 貯水タンク ２６ 自硬性流動体のプラント ２７ 高圧ポンプ ３１ ホース Reference Signs List 1 steel pipe pile (pile with wing) 2 wing 3 opening 11 rod 12 nozzle header 13a, 13b nozzle 20 pile driver 21 auger motor 25 water storage tank 26 plant of self-hardening fluid 27 high-pressure pump 31 hose
───────────────────────────────────────────────────── フロントページの続き (72)発明者 森 玄 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 林 正宏 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 (72)発明者 高野 公寿 東京都千代田区丸の内一丁目１番２号 日 本鋼管株式会社内 Ｆターム(参考） 2D050 AA06 AA16 CA05 CA07 CB05 CB42 CB43 ──────────────────────────────────────────────────続 き Continued on the front page (72) Gen Mori, 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan Inside Nihon Kokan Co., Ltd. (72) Inventor Masahiro Hayashi 1-2-1, Marunouchi, Chiyoda-ku, Tokyo, Japan (72) Inventor, Kotoshi Takano 1-2-1, Marunouchi, Chiyoda-ku, Tokyo F-term (reference) 2D050 AA06 AA16 CA05 CA07 CB05 CB42 CB43
Claims (4)
が設けられた中空の杭を回転して地盤中に埋設する施工
方法において、 杭の埋設開始時又は埋設の途中から前記中空部に挿入し
たロッドの先端部又は先端部近傍に設けたノズルから水
又は自硬性流動体からなる流体を高圧噴射して地盤を掘
削軟化すると共に、支持層に前記自硬性流動体を噴射し
て掘削した地盤と混合し、翼を含む杭先端部近傍を前記
混合体の中に設置することを特徴とする翼付き杭の施工
方法。1. A construction method for rotating a hollow pile provided with a wing for screwing at a tip portion or in the vicinity of the tip portion and burying the pile in the ground, comprising: While excavating and softening the ground by high-pressure injection of water or a fluid composed of a self-hardening fluid from a nozzle provided at the distal end of the inserted rod or in the vicinity of the distal end, the self-hardening fluid was injected into the support layer and excavated. A method for constructing a winged pile, wherein the pile is mixed with the ground and the vicinity of the tip of the pile including the wing is installed in the mixture.
ノズルを設け、これらノズルを該ノズルから噴射される
流体が杭の中心部近傍から杭の外周付近まで分布するよ
うに配置したことを特徴とする請求項１記載の翼付き杭
の施工方法。2. A method according to claim 1, wherein a plurality of nozzles are provided at or near the tip of the rod, and these nozzles are arranged so that the fluid ejected from the nozzles is distributed from near the center of the pile to near the outer periphery of the pile. The method for constructing a winged pile according to claim 1, wherein:
された流体を跳ね返す返し部材を設けたことを特徴とす
る請求項１又は２記載の翼付き杭の施工方法。3. A method for constructing a winged pile according to claim 1, wherein a return member for repelling the fluid ejected from the nozzle is provided at or near the outer edge of the wing.
させることを特徴とする請求項１、２又は３記載の翼付
き杭の施工方法。4. A method for constructing a winged pile according to claim 1, wherein the rod is rotated in a direction opposite to a rotation direction of the pile.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000121945A JP3731181B2 (en) | 2000-04-24 | 2000-04-24 | Construction method of winged pile |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000121945A JP3731181B2 (en) | 2000-04-24 | 2000-04-24 | Construction method of winged pile |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2001303569A true JP2001303569A (en) | 2001-10-31 |
| JP3731181B2 JP3731181B2 (en) | 2006-01-05 |
Family
ID=18632492
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000121945A Expired - Lifetime JP3731181B2 (en) | 2000-04-24 | 2000-04-24 | Construction method of winged pile |
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| Country | Link |
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| JP (1) | JP3731181B2 (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005325513A (en) * | 2004-05-12 | 2005-11-24 | Nippon Steel Corp | Construction management method of steel pile |
| JP2008174934A (en) * | 2007-01-17 | 2008-07-31 | Mitani Sekisan Co Ltd | Method and device for administrating pile hole excavation |
| JP2011236604A (en) * | 2010-05-10 | 2011-11-24 | Kubota-C. I Co Ltd | Standing pole, drill used for the same and installation method of the same |
| JP2013127178A (en) * | 2011-12-19 | 2013-06-27 | Nippon Steel & Sumitomo Metal | Tip diameter enlarged pile |
| CN104947685A (en) * | 2015-06-22 | 2015-09-30 | 郭永 | Pile driver tunneling system and foundation pit bracing technology adopting same |
| CN112343050A (en) * | 2020-10-15 | 2021-02-09 | 长江三峡集团福建能源投资有限公司 | Concrete pipe pile offshore pile sinking construction method |
Families Citing this family (1)
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|---|---|---|---|---|
| CN103981865B (en) * | 2014-05-20 | 2015-09-23 | 青岛科技大学 | A kind of manual pile driving rig of Portable Automatic charging and pile-driving method |
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2000
- 2000-04-24 JP JP2000121945A patent/JP3731181B2/en not_active Expired - Lifetime
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005325513A (en) * | 2004-05-12 | 2005-11-24 | Nippon Steel Corp | Construction management method of steel pile |
| JP4491274B2 (en) * | 2004-05-12 | 2010-06-30 | 新日本製鐵株式会社 | Steel pile construction management method |
| JP2008174934A (en) * | 2007-01-17 | 2008-07-31 | Mitani Sekisan Co Ltd | Method and device for administrating pile hole excavation |
| JP2011236604A (en) * | 2010-05-10 | 2011-11-24 | Kubota-C. I Co Ltd | Standing pole, drill used for the same and installation method of the same |
| JP2013127178A (en) * | 2011-12-19 | 2013-06-27 | Nippon Steel & Sumitomo Metal | Tip diameter enlarged pile |
| CN104947685A (en) * | 2015-06-22 | 2015-09-30 | 郭永 | Pile driver tunneling system and foundation pit bracing technology adopting same |
| CN112343050A (en) * | 2020-10-15 | 2021-02-09 | 长江三峡集团福建能源投资有限公司 | Concrete pipe pile offshore pile sinking construction method |
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| Publication number | Publication date |
|---|---|
| JP3731181B2 (en) | 2006-01-05 |
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