JP2005126945A - Static press-in construction method for steel pipe pile - Google Patents

Static press-in construction method for steel pipe pile Download PDF

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JP2005126945A
JP2005126945A JP2003361772A JP2003361772A JP2005126945A JP 2005126945 A JP2005126945 A JP 2005126945A JP 2003361772 A JP2003361772 A JP 2003361772A JP 2003361772 A JP2003361772 A JP 2003361772A JP 2005126945 A JP2005126945 A JP 2005126945A
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steel pipe
press
slag
fitting
pile
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JP4145771B2 (en
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Sadao Yabuuchi
貞男 藪内
Masaki Akane
正樹 赤根
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Geotop Corp
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Geotop Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a static press-in construction method for a steel pipe pile preventing an expanding phenomenon of the upper layer ground caused by replenishing a filler, and suppressing a pull-in phenomenon of the upper layer ground caused by pressing in a pile. <P>SOLUTION: In a construction method using a press-in machine, the steel pipe pile 2 is inserted in a cylindrical casing 1, and the casing 1 and the steel pipe pile 2 are simultaneously pressed into the ground. While filling the filler 3 in a clearance between the casing 1 and the steel pipe pile 2, press-in and pull-up operation is repeated at predetermined strokes to sink the steel pipe pile 2, and after the steel pipe pile 2 is sunk to a predetermined depth, the casing 1 is pulled up from the ground. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、鋼管杭の静的圧入施工法に関し、特に、充填材の補充による上層地盤の押し拡げ現象を防止するとともに、杭の圧入に伴う上層地盤の引き込み現象を抑制し、特に鋼管杭の周囲に充填材を充填して支持力を増大させることができる鋼管杭の静的圧入施工法に関するものである。   The present invention relates to a method for static press-fitting of steel pipe piles, and in particular, prevents the expansion of the upper ground due to the replenishment of filler, and suppresses the pull-in phenomenon of the upper ground due to the press-fitting of the pile. The present invention relates to a method for static press-fitting of a steel pipe pile that can be filled with a filler to increase the supporting force.

従来、鋼管杭やコンクリート杭等の既製杭を打撃や圧入により埋設する工法においては、打撃及び振動工法があり、油圧ハンマーやバイブロハンマー装置等により鋼管杭やコンクリート杭等の既製杭を直接地盤に圧入する方法が知られている。   Conventionally, in the method of burying prefabricated piles such as steel pipe piles and concrete piles by hitting or press-fitting, there are hammering and vibration methods, and prefabricated piles such as steel pipe piles and concrete piles are directly placed on the ground by hydraulic hammers or vibratory hammer devices. A method of press-fitting is known.

しかしながら、従来のコンクリート節杭の圧入施工法では、例えば、図4(a)に示すように、杭周囲に充填材3を充填しながら、圧入してコンクリート節杭2を沈設すると、軟弱な上層地盤が補充される充填材3によって大きく押し拡げられる現象が発生し、この押し拡げ現象が杭周囲の基礎構造物に有害な変状を及ぼすという問題が生じる。
また、図4(b)に示すように、杭2を地盤に圧入すると、杭周囲の上層地盤の引き込み現象が発生し、大断面の杭の場合にはその分影響範囲も大きくなるので注意を要する。上記油圧ハンマーやバイブロハンマー装置等の動的圧入施工法では、打込み時の振動や騒音等の建設公害が問題とされ都市部では実施できない問題もある。
However, in the conventional method of press-fitting concrete joint piles, for example, as shown in FIG. 4 (a), when the concrete joint pile 2 is sunk by press-fitting while filling the filler 3 around the pile, a soft upper layer is formed. A phenomenon occurs in which the ground is greatly expanded by the filler 3 to be replenished, and this expansion phenomenon causes a harmful change in the foundation structure around the pile.
Also, as shown in Fig. 4 (b), when the pile 2 is press-fitted into the ground, the upper ground around the pile will be pulled in. Cost. In the dynamic press-fitting construction method such as the hydraulic hammer and the vibro hammer device, there is a problem that construction pollution such as vibration and noise at the time of driving is a problem and cannot be implemented in urban areas.

本発明は、上記従来の鋼管杭の静的圧入施工法の有する問題点に鑑み、充填材の補充による上層地盤の押し拡げ現象を防止するとともに、杭の圧入に伴う上層地盤の引き込み現象を抑制し、特に鋼管杭の周囲に充填材を充填して支持力を増大させることができる鋼管杭の静的圧入施工法を提供することを目的とする。   In view of the problems of the conventional method of static press-fitting of steel pipe piles, the present invention prevents the expansion of the upper ground due to refilling of the filler and suppresses the pull-up phenomenon of the upper ground due to the press-fitting of the pile. And it aims at providing the static press-fit construction method of the steel pipe pile which can fill a filler around a steel pipe pile especially, and can increase a supporting force.

上記目的を達成するため、本発明の鋼管杭の静的圧入施工法は、圧入機で鋼管杭を圧入する施工法において、筒状のケーシングに鋼管杭を挿入し、該ケーシングと鋼管杭を同時に地盤に圧入し、その後、鋼管杭を圧入と抜き上げ動作を繰り返しながら沈設することを特徴とする。
なお、ここでいう圧入と引き上げ動作は、鋼管杭を回転させたり、回転させずに行うことを含むものとする。
In order to achieve the above object, the static press-fitting method for steel pipe piles of the present invention is a method of press-fitting steel pipe piles with a press-fitting machine, wherein the steel pipe piles are inserted into a cylindrical casing, and the casings and steel pipe piles are simultaneously inserted. It is characterized in that it is press-fitted into the ground, and then the steel pipe pile is sunk while repeating press-fitting and pull-up operations.
Note that the press-fitting and pulling-up operations mentioned here include rotating the steel pipe pile or without rotating it.

この場合において、ケーシングの外周部に螺旋羽根を設けることができる。   In this case, a spiral blade can be provided on the outer periphery of the casing.

また、ケーシングと鋼管杭の間隙に充填材を充填しながら圧入と抜き上げ動作を繰り返すことができる。   Further, the press-fitting and pull-up operations can be repeated while filling the gap between the casing and the steel pipe pile.

鋼管杭の沈設後、鋼管杭の中空部に充填材を充填して固化させることができる。   After the steel pipe pile is set, the hollow portion of the steel pipe pile can be filled with a filler and solidified.

また、鋼管杭として節杭又は螺旋杭を使用することができる。   Moreover, a node pile or a spiral pile can be used as a steel pipe pile.

また、充填材に膨張性及び固化性を有するスラグを用いることができる。   Moreover, the slag which has expansibility and a solidification property can be used for a filler.

膨張性及び固化性を有するスラグが、製鋼スラグ、ゴミ焼却スラグ、汚泥スラグの1種若しくは2種以上の混合物からなることができる。   Slag which has expansibility and solidification nature can consist of one sort or two sorts or more of steelmaking slag, refuse incineration slag, and sludge slag.

また、膨張性及び固化性を有するスラグに、膨張性を消失した製鋼スラグ、高炉スラグ、フェロアロイスラグ、水砕スラグ、銅製錬スラグ、赤泥、フライアッシュ、ゴミ焼却灰、ガラス破砕物、廃石膏、コンクリート廃材等の産業廃棄物、石膏、生石灰、セメント、砕石、土砂、粘土等の建築用材料、人工材料、鉱物の1種若しくは2種以上を混合した、膨張性及び固化性を有するスラグの膨張性及び固化性を利用することができる。   Steel slag, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, waste incineration ash, glass crushed material, waste gypsum that have lost expansibility Slag with expandability and solidification, mixed with industrial waste such as concrete waste, gypsum, quicklime, cement, crushed stone, earth and sand, building materials such as clay, artificial materials and minerals Expansibility and solidification can be utilized.

本発明の鋼管杭の静的圧入施工法によれば、筒状のケーシングに鋼管杭を挿入し、該ケーシングと鋼管杭を同時に地盤に圧入し、その後、鋼管杭を圧入と抜き上げ動作を繰り返しながら沈設することから、鋼管杭の周囲にケーシングによる仕切壁を形成することができ、これにより、杭の周囲に充填材を充填しながら圧入と抜き上げ動作を繰り返すようにしても、充填材の補充による上層地盤の押し拡げ現象を防止するとともに、ケーシングにより地盤を剪断することから、杭の圧入に伴う上層地盤の引き込み現象を抑制して水平耐力の高い基礎を構築することができる。   According to the method of static press-fitting of steel pipe piles of the present invention, a steel pipe pile is inserted into a cylindrical casing, the casing and the steel pipe pile are simultaneously pressed into the ground, and then the steel pipe pile is repeatedly pressed and pulled up repeatedly. Therefore, it is possible to form a partition wall with a casing around the steel pipe pile, so that even if the press-in and pull-out operations are repeated while filling the filler around the pile, While preventing the expansion of the upper ground due to replenishment and shearing the ground with the casing, it is possible to construct a foundation with high horizontal strength by suppressing the pull-in phenomenon of the upper ground due to the press-fitting of the pile.

この場合、ケーシングの外周部に螺旋羽根を設けることにより、ケーシングをベースマシーンと係合させ、圧入力又は引き抜き力の反力としてケーシングに一部を負担させることができる。   In this case, by providing spiral blades on the outer peripheral portion of the casing, the casing can be engaged with the base machine, and a part of the casing can be borne as a reaction force of pressure input or extraction force.

また、ケーシングと鋼管杭の間隙に充填材を充填しながら圧入と抜き上げ動作を繰り返すことにより、周面摩擦抵抗を低減させながら圧入するとともに、ケーシングでガイドすることにより、所定量の充填材を鋼管杭を抜き上げた間隙に効率よく充填して締め固めることができる。   In addition, by repeating the press-fitting and pull-out operations while filling the gap between the casing and the steel pipe pile, press-fitting while reducing the peripheral frictional resistance, and guiding with the casing, a predetermined amount of filler It is possible to efficiently fill and compact the gaps where the steel pipe piles are pulled up.

また、鋼管杭の沈設後、鋼管杭の中空部に充填材を充填して固化させることにより、充填材を介して軸力の伝達が可能になるため鋼管杭の肉厚を薄くすることができ、さらに、水平耐力を増強することができる。   In addition, after setting the steel pipe pile, filling the hollow part of the steel pipe pile with a filler makes it possible to reduce the wall thickness of the steel pipe pile because axial force can be transmitted through the filler. Furthermore, the horizontal proof stress can be enhanced.

また、鋼管杭として節杭又は螺旋杭を使用することにより、ケーシングと鋼管節杭の間隙に充填材を充填しながら回転させずに圧入と抜き上げ動作を繰り返して、周面摩擦抵抗を低減させながら圧入するとともに、ケーシングでガイドすることにより、所定量の充填材を鋼管節杭を抜き上げた節部間隙に効率よく充填して締め固めることができる。
また、鋼管螺旋杭の場合は、正転圧入と逆転抜き上げ動作を繰り返しながら間隔をあけて配設された螺旋羽根で周囲地盤をある程度ほぐし充填材を充填しやすくして締め固めることができるので、鋼管杭の支持力や引き抜き抵抗力を高めることができる。
In addition, by using joint piles or spiral piles as steel pipe piles, the friction between the casing and the steel pipe joint piles can be reduced by repeating the press-fitting and pull-out operations without rotating while filling with a filler. While being press-fitted while being guided by the casing, a predetermined amount of filler can be efficiently filled into the joint gap between the steel pipe joint piles and compacted.
In addition, in the case of steel pipe spiral piles, it is possible to loosen the surrounding ground to some extent with helical blades arranged at intervals while repeating forward press-fitting and reverse pull-up operations, so that the filler can be easily filled and compacted. It is possible to increase the supporting force and pulling resistance of the steel pipe pile.

また、充填材に膨張性及び固化性を有するスラグ、特に、製鋼スラグ、ゴミ焼却スラグ、汚泥スラグの1種若しくは2種以上の混合物を用いることにより、製鋼スラグが膨張して固結し、鋼管杭と一体となって支持力を大幅に高めることができる。
膨張性及び固化性を有するスラグとして、膨張性を消失した製鋼スラグ、高炉スラグ、フェロアロイスラグ、水砕スラグ、銅製錬スラグ、赤泥、フライアッシュ、ゴミ焼却灰、ガラス破砕物、廃石膏、コンクリート廃材等の産業廃棄物、石膏、生石灰、セメント、砕石、土砂、粘土等の建築用材料、人工材料、鉱物の1種若しくは2種以上を混合した、膨張性及び固化性を有するスラグの膨張性及び固化性を利用することができる。
Moreover, by using one or a mixture of two or more of slag having expandability and solidification as the filler, particularly steelmaking slag, refuse incineration slag, and sludge slag, the steelmaking slag expands and consolidates. Together with the pile, the supporting force can be greatly increased.
Steel slag, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, garbage incineration ash, glass crushed material, waste gypsum, concrete that has lost expansibility as slag having expandability and solidification Industrial materials such as waste materials, gypsum, quicklime, cement, crushed stone, earth and sand, clay, and other building materials, artificial materials, and one or more of minerals mixed to expand and solidify slag expandability And solidification can be utilized.

以下、本発明の鋼管杭の静的圧入施工法の実施の形態を図面に基づいて説明する。   Hereinafter, an embodiment of a static press-fitting method for steel pipe piles according to the present invention will be described with reference to the drawings.

図1〜図2に、本発明の鋼管杭の静的圧入施工法の一実施例を示す。
この鋼管節杭の圧入施工法は、筒状のケーシング1に鋼管節杭2を挿入し、該ケーシング1と鋼管節杭2を同時に地盤に圧入し、その後、ケーシング1と鋼管節杭2の間隙に充填材3を充填しながら、所定ストロークで回転せずに圧入と抜き上げ動作を繰り返して鋼管節杭2を沈設し、鋼管節杭2を所定深度まで沈設した後にケーシング1を地盤から引き上げるようにする。
そして、鋼管節杭2の中空部に充填材を充填する。
この場合、ケーシング1の圧入は、回転させることなく直線的に又は回転させながら行うことができる。
同様に、鋼管節杭2の圧入や抜き上げ動作も、回転させることなく直線的に又は回転させながら行うことができる。
1 to 2 show an embodiment of a static press-fitting method for steel pipe piles according to the present invention.
This steel pipe joint pile press-in method is to insert a steel pipe joint pile 2 into a cylindrical casing 1, press the casing 1 and the steel pipe joint pile 2 into the ground at the same time, and then the gap between the casing 1 and the steel pipe joint pile 2. The steel pipe joint pile 2 is sunk by repeating the press-fitting and pulling-out operations without rotating at a predetermined stroke while filling the filler 3 with the steel pipe, and the casing 1 is pulled up from the ground after the steel pipe joint pile 2 is sunk to a predetermined depth. To.
Then, the hollow portion of the steel pipe joint pile 2 is filled with a filler.
In this case, the press-fitting of the casing 1 can be performed linearly or while rotating without being rotated.
Similarly, the press-fitting and extracting operation of the steel pipe joint pile 2 can be performed linearly or while rotating without rotating.

ケーシング1の外周部には螺旋羽根11が一周単位で間隔をあけて設けられており、これにより、鋼管節杭2の圧入力又は引き抜き力の反力をケーシング1に一部負担させるようにしている。
また、鋼管杭2として、節杭を使用することにより、充填材を節部間隙に効率よく充填して締め固めることができるので、鋼管節杭2の支持力や引き抜き抵抗力を高めるようにしている。
なお、鋼管杭2には、図3に示すように、鋼管41の外周に一周単位で間隔をあけて羽根42を配設した鋼管螺旋杭4を使用することもできる。このように、鋼管螺旋杭4を用いることにより、鋼管節杭と同様に鋼管杭2の支持力や引き抜き抵抗力を高めることができる。
Spiral blades 11 are provided on the outer periphery of the casing 1 at intervals of one round unit, so that the reaction force of the pressure input or pull-out force of the steel pipe joint pile 2 is partially borne by the casing 1. Yes.
In addition, by using a joint pile as the steel pipe pile 2, the filler can be efficiently filled into the joint gap and compacted, so that the support force and pulling resistance of the steel pipe joint pile 2 are increased. Yes.
In addition, as shown in FIG. 3, the steel pipe pile 2 which can arrange | position the blade | wing 42 in the outer periphery of the steel pipe 41 at intervals by one round can also be used for the steel pipe pile 2. As shown in FIG. Thus, by using the steel pipe spiral pile 4, the support force and pulling-out resistance force of the steel pipe pile 2 can be increased similarly to the steel pipe joint pile.

充填材3には、膨張性及び固化性を有するスラグを用いている。
この膨張性及び固化性を有するスラグとしては、製鋼スラグ、ゴミ焼却スラグ、汚泥スラグの1種若しくは2種以上の混合物を用いることができる。
また、膨張性及び固化性を有するスラグに、膨張性を消失した製鋼スラグ、高炉スラグ、フェロアロイスラグ、水砕スラグ、銅製錬スラグ、赤泥、フライアッシュ、ゴミ焼却灰、ガラス破砕物、廃石膏、コンクリート廃材等の産業廃棄物、石膏、生石灰、セメント、砕石、土砂、粘土等の建築用材料、人工材料、鉱物の1種若しくは2種以上を混合した、膨張性及び固化性を有するスラグの膨張性及び固化性を利用することができる。
このように、充填材3に、膨張性及び固化性を有するスラグを用いることにより、製鋼スラグを膨張して固結させ、鋼管節杭2と一体化して支持力を大幅に高めている。
As the filler 3, slag having expansibility and solidification is used.
As the slag having expandability and solidification property, one or a mixture of steelmaking slag, refuse incineration slag, and sludge slag can be used.
Steel slag, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, garbage incinerated ash, glass crushed, waste gypsum that has lost expansibility Slag with expandability and solidification, mixed with industrial waste such as concrete waste, gypsum, quicklime, cement, crushed stone, earth and sand, building materials such as clay, artificial materials and minerals Expansibility and solidification can be utilized.
Thus, by using the slag which has expansibility and a solidification property for the filler 3, the steelmaking slag is expanded and solidified, and integrated with the steel pipe joint pile 2 to greatly increase the supporting force.

次に、本実施例の鋼管杭の静的圧入施工法の施工手順を一例として説明する。
ここで、ケーシング1は鋼管製で長さが約10m、外周に一周単位で間隙をあけて螺旋羽根が配設されている。これは、鋼管節杭の節部径及び上層の軟弱地盤の性状にもよるが、同じ地層の軟弱地盤であっても地上から約5mより深い位置では土圧がかかるので鋼管節杭2の圧入による周囲地盤の側方押し拡げ現象による影響は比較的小さいことと、圧入力又は引き抜き力の反力分担とすることを考慮に入れ安全側で10mとした。
ケーシング1の内壁と杭節部21との間隔は、充填材3の最大粒径の2〜5倍程度、より好ましくは3倍程度に設定する。これにより、充填材3が途中で詰まることなく下部まで投入することができ、また、杭周囲に介在させながら鋼管節杭2を圧入することができる。
充填材3には、粒径が30mm以下程度の粒状材を用いることが好ましく、より具体的には、粒径が30mm以下の膨張性及び固化性を有する製鋼スラグに、平均粒径0.5〜5mmの水砕スラグを30パーセント程度混合した混合スラグを使用する。製鋼スラグは粒度分布の悪い方が締め固め効果が良い。
Next, the construction procedure of the static press fitting method for steel pipe piles of the present embodiment will be described as an example.
Here, the casing 1 is made of a steel pipe and has a length of about 10 m, and a spiral blade is disposed on the outer periphery with a gap in one round unit. This depends on the diameter of the steel pipe joint pile and the nature of the soft ground in the upper layer, but even if it is the soft ground of the same layer, the earth pressure is applied at a position deeper than about 5 m from the ground, so the steel pipe joint pile 2 is press-fitted. In consideration of the fact that the influence of the side ground expansion phenomenon of the surrounding ground due to is relatively small, and the reaction force sharing of the pressure input or pull-out force is taken into consideration, the safety side is set to 10 m.
The interval between the inner wall of the casing 1 and the pile node portion 21 is set to about 2 to 5 times, more preferably about 3 times the maximum particle diameter of the filler 3. Thereby, the filler 3 can be thrown down to the lower part without being clogged in the middle, and the steel pipe joint pile 2 can be press-fitted while being interposed around the pile.
As the filler 3, it is preferable to use a granular material having a particle size of about 30 mm or less. More specifically, an average particle size of 0.5 is added to a steelmaking slag having a particle size of 30 mm or less and having expandability and solidification. A mixed slag obtained by mixing about 30 percent of a granulated slag of ˜5 mm is used. Steelmaking slag has a better compaction effect when the particle size distribution is poor.

以下、図1〜図2を参照して、施工手順を説明する。
(a)ケーシング1に鋼管節杭2を挿入し、杭中心を杭芯にセットする。
(b)同時に、ケーシング1を正転圧入するとともに鋼管節杭2を回転させないで圧入する。
(c)継杭をする場合は、鋼管節杭2を地面から1m程度上方に引き上げて上部に鋼管節杭2を連結する。
(d)鋼管節杭2を回転させないで鉛直に30cm程度引き上げてから、地上からケーシング1と鋼管節杭2の間隙に混合スラグを所定量投入し、鋼管節杭2を回転させないで更に下方に押し込む。
(e)鋼管節杭2は、一定長圧入又は回転圧入してから、一定長回転又は鉛直に抜き上げる動作を繰り返しながら沈設される。
(f)上記手順(d)〜(e)を繰り返して所定深度に設置する。その後、鋼管節杭2の天端位置まで充填材3として混合スラグを充填する。
(g)ケーシング1を逆転して地上に引き上げる。
(h)杭2の沈設後、鋼管節杭2の中空部に充填材3を充填する。充填材3は、例えばスラグにセメントや石膏を混合し、早期に固化させるようにする。これにより、固化材を介して軸力の伝達が可能になり、そのために鋼管杭の肉厚を比較的薄くすることができ、さらに、水平耐力を増強することができる。
Hereinafter, the construction procedure will be described with reference to FIGS.
(A) The steel pipe joint pile 2 is inserted into the casing 1, and the pile center is set on the pile core.
(B) At the same time, the casing 1 is press-fitted in a normal direction and the steel pipe joint pile 2 is pushed in without being rotated.
(C) In the case of jointing, the steel pipe joint pile 2 is pulled up about 1 m from the ground and connected to the upper part.
(D) The steel pipe joint pile 2 is lifted vertically by about 30 cm without rotating, and then a predetermined amount of mixed slag is poured into the gap between the casing 1 and the steel pipe joint pile 2 from the ground, and the steel pipe joint pile 2 is further rotated downward without rotating. Push in.
(E) The steel pipe joint pile 2 is laid while repeating a fixed length rotation or vertical pull-out operation after a constant length press-fitting or rotary press-fitting.
(F) Repeat the above steps (d) to (e) to install at a predetermined depth. Thereafter, the mixed slag is filled as the filler 3 up to the top end position of the steel pipe joint pile 2.
(G) The casing 1 is reversed and pulled up to the ground.
(H) After the pile 2 is set, the hollow portion of the steel pipe joint pile 2 is filled with the filler 3. For the filler 3, for example, cement or gypsum is mixed with slag so as to be solidified at an early stage. As a result, axial force can be transmitted through the solidified material, so that the thickness of the steel pipe pile can be made relatively thin, and the horizontal proof stress can be enhanced.

かくして、本実施例の鋼管杭の静的圧入施工法は、筒状のケーシング1に鋼管節杭2を挿入し、該ケーシング1と鋼管節杭2を同時に地盤に圧入し、その後、鋼管節杭2を圧入と抜き上げ動作を繰り返しながら沈設することから、鋼管節杭2の周囲にケーシング1による仕切壁を形成することができ、これにより、杭の周囲に充填材3を充填しながら圧入と抜き上げ動作を繰り返すようにしても、充填材3の補充による上層地盤の押し拡げ現象を防止するとともに、ケーシング1により地盤を剪断することから、杭の圧入に伴う上層地盤の引き込み現象を抑制し、上層地盤の引き込みによる緩みを防止し、水平耐力の高い基礎を構築することができる。
この場合、ケーシング1の外周部に螺旋羽根を設けることにより、圧入力又は引き抜き力の反力としてケーシング1に一部を負担させることができ、また、鋼管節杭ではケーシング1と鋼管節杭2の間隙から充填材3をケーシング先端部に充填しながら圧入と抜き上げ動作を繰り返すことにより、周囲の充填材と孔壁を効率よく締め固めて節部の支圧効果により支持力が増大する。
そして、周面摩擦抵抗を低減させながら圧入するとともに、ケーシングでガイドすることによって、所定量の充填材3を鋼管節杭2を抜き上げた節部間隙に効率よく充填して締め固めることができる。
また、鋼管螺旋杭4では、回転圧入と逆転引き上げにより同様の動作により、節杭に比べて小さな圧入力で効果を奏することができる。
Thus, the static press-fitting method of the steel pipe pile of this embodiment is to insert the steel pipe joint pile 2 into the cylindrical casing 1 and press the casing 1 and the steel pipe pile 2 into the ground at the same time, and then the steel pipe pile. 2 is sunk while repeating press-fitting and pulling-up operations, so that a partition wall can be formed by the casing 1 around the steel pipe joint pile 2, and thereby press-fitting while filling the filler 3 around the pile. Even if the pulling-up operation is repeated, the upper layer ground is not expanded due to the replenishment of the filler 3, and the ground is sheared by the casing 1 to suppress the upper layer pull-in phenomenon due to the press-fitting of the pile. It is possible to prevent loosening due to the upper ground pulling in and to build a foundation with high horizontal strength.
In this case, by providing a spiral blade on the outer peripheral portion of the casing 1, a part of the casing 1 can be borne as a reaction force of pressure input or pull-out force. By repeating the press-fitting and pulling-up operations while filling the casing 3 with the filler 3 from the gap, the surrounding filler and the hole wall are efficiently compacted, and the supporting force is increased by the effect of supporting the joints.
Then, while press-fitting while reducing the peripheral frictional resistance, and guiding with a casing, a predetermined amount of filler 3 can be efficiently filled into the joint gap between the steel pipe joint piles 2 and compacted. .
Moreover, in the steel pipe spiral pile 4, an effect can be show | played by a small pressure input compared with a node pile by the same operation | movement by rotary press-fit and reverse rotation raising.

以上、本発明の鋼管杭の静的圧入施工法について、複数の実施例に基づいて説明したが、本発明は上記実施例に記載した構成に限定されるものではなく、各実施例に記載した構成を適宜組み合わせる等、その趣旨を逸脱しない範囲において適宜その構成を変更することができるものである。   As mentioned above, although the static press-fitting construction method of the steel pipe pile of this invention was demonstrated based on the several Example, this invention is not limited to the structure described in the said Example, It described in each Example. The configuration can be changed as appropriate within a range not departing from the gist, such as appropriately combining the configurations.

本発明の鋼管杭の静的圧入施工法は、充填材の補充による上層地盤の押し拡げ現象を防止するとともに、杭の圧入に伴う上層地盤の引き込み現象を抑制するという特性を有していることから、鋼管杭の静的な圧入施工の用途に好適に用いることができる。   The method of static press-fitting of steel pipe piles of the present invention has the property of preventing the upper-layer ground expansion phenomenon due to refilling of the filler and suppressing the pull-up phenomenon of the upper ground accompanying the press-fitting of the pile. Therefore, it can be suitably used for static press-fitting construction of steel pipe piles.

本発明の鋼管杭の静的圧入施工法の一実施例を示し、(a)〜(c)は第1〜第3工程を示す断面図である。One Example of the static press-fit construction method of the steel pipe pile of this invention is shown, (a)-(c) is sectional drawing which shows a 1st-3rd process. 同(d)〜(h)は第4〜第8工程を示す断面図である。(D)-(h) is sectional drawing which shows the 4th-8th process. 鋼管螺旋杭の正面図である。It is a front view of a steel pipe spiral pile. 従来の鋼管杭の静的圧入施工法を示し、(a)は上層地盤の押し拡げ現象を示す断面図、(b)は杭の圧入による上層地盤の引き込み現象を示す断面図である。A conventional method for static press-fitting of steel pipe piles is shown, (a) is a cross-sectional view showing the expansion phenomenon of the upper ground, and (b) is a cross-sectional view showing a pull-in phenomenon of the upper ground due to the press-fitting of the pile.

符号の説明Explanation of symbols

1 ケーシング
11 螺旋羽根
2 鋼管杭
21 杭節部
3 充填材
4 鋼管螺旋杭
41 鋼管
42 羽根
DESCRIPTION OF SYMBOLS 1 Casing 11 Spiral blade 2 Steel pipe pile 21 Pile node 3 Filler 4 Steel pipe spiral pile 41 Steel pipe 42 Blade

Claims (8)

圧入機で鋼管杭を圧入する施工法において、筒状のケーシングに鋼管杭を挿入し、該ケーシングと鋼管杭を同時に地盤に圧入し、その後、鋼管杭を圧入と抜き上げ動作を繰り返しながら沈設することを特徴とする鋼管杭の静的圧入施工法。   In a construction method in which a steel pipe pile is press-fitted with a press-fitting machine, the steel pipe pile is inserted into a cylindrical casing, the casing and the steel pipe pile are pressed into the ground at the same time, and then the steel pipe pile is laid while repeating press-fitting and pulling-up operations. A static press-fit method for steel pipe piles. ケーシングの外周部に螺旋羽根を設けることを特徴とする請求項1記載の鋼管杭の静的圧入施工法。   The method for static press-fitting of steel pipe piles according to claim 1, wherein spiral blades are provided on the outer periphery of the casing. ケーシングと鋼管杭の間隙に充填材を充填しながら圧入と抜き上げ動作を繰り返すことを特徴とする請求項1記載の鋼管杭の静的圧入施工法。   2. The method of static press-fitting of steel pipe piles according to claim 1, wherein the press-fitting and pull-up operations are repeated while filling the gap between the casing and the steel pipe piles. 鋼管杭の沈設後、鋼管杭の中空部に充填材を充填して固化させることを特徴とする請求項1、2又は3記載の鋼管杭の静的圧入施工法。   The method for static press-fitting of a steel pipe pile according to claim 1, 2 or 3, wherein after the steel pipe pile is set, the hollow portion of the steel pipe pile is filled with a filler and solidified. 鋼管杭として節杭又は螺旋杭を使用することを特徴とする請求項1、2、3又は4記載の鋼管杭の静的圧入施工法。   The method for static press-fitting of a steel pipe pile according to claim 1, 2, 3, or 4, wherein a joint pile or a spiral pile is used as the steel pipe pile. 充填材に膨張性及び固化性を有するスラグを用いることを特徴とする請求項1、2、3、4又は5記載の鋼管杭の静的圧入施工法。   The method for static press-fitting of a steel pipe pile according to claim 1, 2, 3, 4, or 5, wherein slag having expandability and solidification is used for the filler. 膨張性及び固化性を有するスラグに、製鋼スラグ、ゴミ焼却スラグ、汚泥スラグの1種若しくは2種以上の混合物を用いることを特徴とする請求項6記載の鋼管杭の静的圧入施工法。   The method for static press-fitting of a steel pipe pile according to claim 6, wherein one or a mixture of steelmaking slag, refuse incineration slag and sludge slag is used as the slag having expandability and solidification. 膨張性及び固化性を有するスラグに、膨張性を消失した製鋼スラグ、高炉スラグ、フェロアロイスラグ、水砕スラグ、銅製錬スラグ、赤泥、フライアッシュ、ゴミ焼却灰、ガラス破砕物、廃石膏、コンクリート廃材等の産業廃棄物、石膏、生石灰、セメント、砕石、土砂、粘土等の建築用材料、人工材料、鉱物の1種若しくは2種以上を混合した、膨張性及び固化性を有するスラグの膨張性及び固化性を利用できるものであることを特徴とする請求項6又は7記載の鋼管杭の静的圧入施工法。   Steel slag, blast furnace slag, ferroalloy slag, granulated slag, copper smelting slag, red mud, fly ash, waste incineration ash, glass crushed material, waste plaster, concrete Industrial materials such as waste materials, gypsum, quicklime, cement, crushed stone, earth and sand, clay, and other building materials, artificial materials, and one or more of minerals mixed to expand and solidify slag expandability The method for static press-fitting of steel pipe piles according to claim 6 or 7, wherein the solidification property can be utilized.
JP2003361772A 2003-10-22 2003-10-22 Static press-fit method for steel pipe piles Expired - Fee Related JP4145771B2 (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108612094A (en) * 2018-04-27 2018-10-02 毕建东 The method that immersed tube plants stake
CN112982518A (en) * 2021-03-19 2021-06-18 云南建投第一勘察设计有限公司 Construction method for forced compression reinforcement of static pressure pile machine
JP7116516B1 (en) * 2022-02-08 2022-08-10 株式会社スペース二十四インフォメーション Strut fixing method
CN115369864A (en) * 2022-09-01 2022-11-22 中建七局国际工程建设有限公司 Construction method of low-carbon high-strength overload prepressing pre-settling diagenetic composite pile

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108612094A (en) * 2018-04-27 2018-10-02 毕建东 The method that immersed tube plants stake
CN112982518A (en) * 2021-03-19 2021-06-18 云南建投第一勘察设计有限公司 Construction method for forced compression reinforcement of static pressure pile machine
JP7116516B1 (en) * 2022-02-08 2022-08-10 株式会社スペース二十四インフォメーション Strut fixing method
JP7411267B2 (en) 2022-02-08 2024-01-11 株式会社スペース二十四インフォメーション Post fixing method
CN115369864A (en) * 2022-09-01 2022-11-22 中建七局国际工程建设有限公司 Construction method of low-carbon high-strength overload prepressing pre-settling diagenetic composite pile

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