JP2004263414A - Tip implement for steel pipe jacking pile and steel pipe pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a tip implement for a steel pipe jacking pile capable of greatly reducing the manufacturing cost by remarkably reducing the kinds of the tip implement of a steel pipe jacking pile in comparison with the conventional cases and preventing the spiral cutting edge from being damaged by the underground stones, and further, greatly reducing the construction cost of a well in comparison with conventional cases. <P>SOLUTION: The tip implement is fixed to the extremity of a pile, when a steel pipe pile is pressed in the underground. An opposite side position opposite to the undeerground press in part has a tapered face wherein the diameter gradually decreases as the above side position goes to the direction of the pile from the outside to the inside and press in extremity side to the direction of the pile and the section is formed of straight lines or curved lines. The external surface of the tip implement is provided with one or more spiral excavation brades. In the rotational vicinity of the extremity of the excavation brade of the tip implement, an earth reservoir for the earth excavated by the excavation brades is formed in the rotational vicinity of the tip of the excavation breads. Moreover, one or more holes are formed in the tip implement for introducing the underground water into the inside of the steel pipe pile. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【００２３】
次に、本実施形態１の鋼管杭圧入用先端具１の使用方法を図１（ｂ）−（ｄ）を参照して説明する。本実施形態１は、一種類の先端具１を、互いに径が異なる複数種類の鋼管杭４ａ，４ｂ，４ｃのために共用できるという点に特徴がある。すなわち、径が比較的小さい鋼管杭４ａを地中に圧入するときは、図１（ｂ）に示すように、前記鋼管杭４ａの先端を、前記先端具１の背面部３のテーパー面の上端３ｂ近傍部（直径が小さい部分）に当接させて溶接することにより、鋼管杭４ａに先端具１を固定することができる（なお、図において５ａは溶接部分である）。また、径が中くらいの鋼管杭４ｂを地中に圧入するときは、図１（ｃ）に示すように、前記鋼管杭４ｂの先端を、前記先端具１の背面部３のテーパー面の中央部分（直径が中くらいの部分）に当接させて溶接することにより、鋼管杭４ｂに先端具１を固定することができる（なお、図において５ｂは溶接部分である）。さらに、径が比較的大きい鋼管杭４ｃを地中に圧入するときは、図１（ｄ）に示すように、前記鋼管杭４ｃの先端を、前記先端具１の背面部３のテーパー面の下端３ａ近傍部（直径が大きい部分）に当接させて溶接することにより、鋼管杭４ｃに先端具１を固定することができる（なお、図において５ｃは溶接部分である）。
【００２４】
このように、本実施形態１によれば、一種類の先端具１を、例えば約１００−１５０ｍｍの範囲（又は、約２００−２６０ｍｍの範囲、あるいは、約３００−４００の範囲）内の互いに径の異なる複数種類の鋼管杭に共通に固定し使用することができるようになるので、先端具の種類を大幅に減少させて、先端具の製造コストを大幅に低減させ、鋼管杭の圧入工事のコストを低減させることができるようになる。
【００２５】
また、特に、本実施形態１では、一種類の先端具１を用意しておくだけで、工事現場で、互いに径が異なる複数種類の基礎杭の中の所望の種類の鋼管杭を選んで、それに先端具１を溶接して使用することができるので、従来のように予め先端具を固定した多種類の鋼管杭を倉庫などに保管しておく必要がなくなる。したがって、本実施形態１によれば、工事で使用すべき鋼管杭を現場で選んでそれに多種類の鋼管杭に共用可能な先端具を現場で溶接・固定すればよいという柔軟な対応が可能になり、従来のように直ちには使用する予定のない鋼管杭（先端具を固定したもの）を予め多量に倉庫に保管しておくという無駄なことをする必要がなくなり、工事の施工コストを大幅に低減することが可能になる。
【００２６】
また、本実施形態１では、地中に圧入する先端部の反対側の背面部３を外側から内側に向かうにしたがって且つ図示下方（圧入先端側）から図示上方（杭の方向）に向かうにしたがって徐々に直径が縮小するテーパー状に形成しているので、例えば、杭の圧入個所を間違えたときや調査用の杭を圧入するときなどにおいて圧入した杭を地上に引き抜く必要があるときでも、引き抜き時に土の抵抗を最小にすることができ、引き抜き作業を極めて容易に行えるようになる（これに対して、前記背面部３がテーパー状に形成されていないときは、引き抜き時に土が抵抗となって容易に引き抜くことができなくなってしまう）。
【００２７】
（実施形態２） 次に、図２（ａ）は本発明の実施形態２による鋼管杭圧入用先端具１１を示す斜視図、図２（ｂ）は図２（ａ）の先端具１１をその逆さ（下）方向から見たときの状態を示す斜視図である。図２において、１２は地中に圧入されるときの圧入先端となる略円錐状の先端部、１３は前記先端部１２の反対側に位置し鋼管杭と対向するテーパー状の背面部である。
【００２８】
本実施形態２においては、前記先端部１２の外表面に、２つの螺旋状の掘削刃１４，１５が備えられている。また、本実施形態２では、前記先端部１２には、前記掘削刃１４，１５の先端１４ａ，１５ａの回転方向の近傍部分に、それぞれ窪み１６，１７が形成されている。これらの窪み１６，１７は、前記掘削刃１４，１５により掘削された土を圧縮した状態で溜め込んでおくためのものである。
【００２９】
すなわち、本実施形態２では、鋼管杭圧入先端具１１の先端部１２に前述のような窪み１６，１７を形成しているので、前記先端具１１が地中に圧入されて前記掘削刃１４，１５が土を掘削していくとき、掘削された土は直ちに前記掘削刃１４，１５を伝って上方に移動するのではなく、いったん前記窪み１６，１７の中に溜め込まれて圧縮させられる。その結果、前記掘削刃１４，１５が地中で掘削した土や石は、掘削刃１４，１５に当たる前に、まず、前記窪み１６，１７に溜め込まれて圧縮された土に当たるようになる。よって、本実施形態２によれば、例えば、前記掘削刃１４，１５が地中で硬い石を掘削した場合でも、その石は前記掘削刃１４，１５に当たる前に前記窪み１６，１７中に溜まった土に当たるので、前記石により前記掘削刃１４，１５が損傷してしまうことが有効に防止されるようになる。
【００３０】
（実施形態３） 次に、図３は本発明の実施形態３による鋼管杭圧入用先端具２１を示す斜視図である。図３において、２２は前記先端具２１の圧入先端となる円錐状の先端部、２３は前記先端部２２の反対側に位置して杭と対向するテーパー状の背面部、２３ｃは前記背面部２３の図示上方（杭に対向する側）の中央に形成された開口部である。
【００３１】
本実施形態３による先端具２１は、井戸掘り工事に使用することを予定している。本実施形態３の先端具２１では、前記先端部２２に複数の穴２４が形成されている。この穴２４は、地下水を前記先端具２１の内部に導入し、更にその地下水を前記開口部２３ｃを介してパイプ状の杭の内部に導入するためのものである。
【００３２】
すなわち、本実施形態３の先端具２１を使用して井戸掘り工事を行う場合は、この先端具２１を鋼管杭（図示せず）に溶接・固定して、この先端具２１と杭を地中に圧入する。そして、前記先端具２１が地下水まで到達したとき、前記先端具２１と杭をそのまま埋め殺しの状態にし、前記先端具２１の前記穴２４から地下水を前記杭の中に導入して上昇させ飲用水などに利用する。
【００３３】
従来の井戸掘り工事においては、（１）例えば８−１０ｍｍ径のビット（先端具）を付けた鋼管を地中に圧入し、（２）その鋼管をいったん引き抜いて、（３）その引き抜いた後にできた穴の中に地下水を導入するためのパイプを入れる、という少なくとも３つの工程を経る必要があったので、井戸の施工コストが高くなってしまっていた。これに対して、本実施形態３の先端具２１を使用すれば、前記の先端具２１を付けた鋼管を地中に圧入して埋め殺しにするというただ一つの工程だけで地下水を飲用水などに利用することができるようになるので、井戸の施工コストを大幅に低減することができるようになる。
【００３４】
以上、本発明の実施形態について説明してきたが、本発明はこれらに限られるものではなく様々な変更が可能である。例えば、前記の各実施形態１−３においては、鋼管杭圧入用先端具として、円錐状の先端部とテーパー状の背面部との双方とも断面が直線状に形成されているものを示しているが、本発明においては、断面が曲線状に形成されたものを含んでいてもよい。
【００３５】
すなわち、本発明においては、図４（ａ）に示すように、先端具３１は、地中に圧入される圧入先端となる先端部３２が断面曲線状に形成され、且つ、杭に対向する側の背面部３３が断面曲線状のテーパー状に形成されていてもよい。また、本発明においては、図４（ｂ）に示すように、先端具４１は、地中に圧入される圧入先端となる先端部４２が断面曲線状に形成され、且つ、杭に対向する側の背面部４３が断面直線状のテーパー状に形成されていてもよい。さらに、本発明においては、図４（ｃ）に示すように、先端具５１は、地中に圧入される圧入先端となる先端部５２が断面直線状（円錐状）に形成され、且つ、杭に対向する側の背面部５３が断面曲線状のテーパー状に形成されていてもよい。
【００３６】
また、本発明においては、鋼管杭圧入用先端具の略テーパー状の面に、鋼管杭との位置ズレを防止するための位置ズレ防止手段、例えば、一つ又は複数の凹状の窪み、一つ又は複数の突起、凹凸面、又は、一つ又は複数のネジ（位置ズレ防止用ネジ）挿入用穴などを備えるようにしてもよい。
【００３７】
また、本発明においては、鋼管杭の、前記先端具の前記略テーパー状の面に当接される下端部又は内壁部に、前記略テーパー状の面との位置ズレを防止するための凹状又は凸状部分を形成するようにしてもよい。
【００３８】
さらに、本発明においては、鋼管杭の、前記先端具の前記略テーパー状の面に当接される下端部の近傍部分に、一つ又は複数の穴であって地下水を前記鋼管杭の内部に導入するための穴を形成するようにしてもよい。
【００３９】
【発明の効果】
以上に説明したように、本発明の鋼管杭圧入用先端具においては、地中に圧入される先端部と反対側に位置して杭に対向している部分を略テーパー状に形成するようにしたので、互いに異なる径を有している複数種類の杭を、一種類の先端具の前記略テーパー状の面に共通に固定できるようになる。したがって、本発明によれば、一種類の先端具を、互いに径の異なる複数種類の杭のために共通に使用することができるようになるので、先端具の種類を大幅に減少させて、先端具の製造コストを大幅に低減させ、杭の圧入工事のコストを大幅に低減させることができるようになる。
【００４０】
また、本発明においては、一種類の先端具を用意しておくだけで、工事現場で、互いに径が異なる複数種類の杭の中の所望の種類の杭を選んで、それに先端具を固定して圧入のために使用することができるので、従来のように予め先端具を固定した多種類の杭を倉庫などに保管しておく必要がなくなる。したがって、本発明によれば、工事で使用すべき杭を現場で選んでそれに多種類の杭に共用可能な先端具を現場で溶接・固定すればよいという現場での柔軟な対応が可能になり、従来のように直ちには使用する予定のない杭（先端具を固定したもの）を予め多量に倉庫に保管しておくという無駄なことをする必要がなくなり、工事の施工コストを大幅に低減することが可能になる。
【００４１】
また、本発明においては、地中に圧入する先端部の反対側の背面部を外側から内側に向かうにしたがって且つ圧入先端側から杭の方向に向かうにしたがって徐々に直径が縮小する略テーパー状に形成しているので、例えば、杭の圧入個所を間違えたときや調査用の杭を圧入するときなどにおいて圧入した杭を地上に引き抜く必要があるときでも、引き抜き時に土の抵抗を最小にすることができ、引き抜き作業を極めて容易に行えるようになる。
【００４２】
また、本発明においては、鋼管杭圧入先端具の先端部に備えられた掘削刃先端の圧入方向近傍に一つ又は複数の窪みを形成するようにしているので、前記先端具が地中に圧入されて前記掘削刃が土を掘削していくとき、掘削された土はいったん前記窪みの中に溜め込まれて圧縮させられるようになる。そのため、本発明によれば、前記掘削刃が地中で掘削した土や石は、前記掘削刃に当たる前に、まず、前記窪みに溜め込まれて圧縮された土に当たるようになる。したがって、本発明によれば、例えば、前記掘削刃が地中で硬い石を掘削した場合でも、その石は前記掘削刃に当たる前に前記窪み中に溜まった土に当たるようになるので、前記石により掘削刃が損傷してしまうことが有効に防止されるようになる。
【００４３】
また、本発明において、鋼管杭圧入用先端具の略テーパー状の面に、鋼管杭とのズレを防止するための位置ズレ防止手段（一つ又は複数の凹状の窪み、一つ又は複数の突起、凹凸面、又は、一つ又は複数のネジ挿入用穴など）を備えるようにしたときは、鋼管杭と先端具との溶接部分の位置決めを極めて容易に且つ高精度に行うことができるようになる。また、鋼管杭の、前記先端具の前記略テーパー状の面に当接・対向される下端部又は内壁部に、前記略テーパー状の面との位置ズレを防止するための凹状又は凸状部分を形成するようにしたときも、同様の効果が得られる。
【００４４】
さらに、本発明においては、鋼管杭圧入用先端具の先端部に一つ又は複数の穴を形成するようにし、この穴から地下水を前記先端具の内部に導入し、更にその地下水を前記先端具の開口部を介してパイプ状の杭の内部に導入できるようにしている。したがって、本発明によれば、井戸掘り工事を行う場合に、本発明の先端具をパイプ状の杭に固定して地中に圧入し、前記先端具が地下水に到達したとき、前記先端具と杭をそのまま埋め殺しの状態にするだけで、前記先端具の前記穴から地下水を前記パイプ状の杭の中に導入して飲用水などに利用することができるので、従来と比べて井戸堀り工事の施工コストを大幅に低減させられるようになる。また、鋼管杭の、前記先端具の前記略テーパー状の面に当接される下端部の近傍部分に、一つ又は複数の穴であって地下水を前記鋼管杭の内部に導入するための穴を形成するようにしたときも、同様の効果が得られる。
【図面の簡単な説明】
【図１】本発明の実施形態１による鋼管杭圧入用先端具の構成と使用方法を説明するための図。
【図２】本発明の実施形態２による鋼管杭圧入用先端具の構成を説明するための図。
【図３】本発明の実施形態３による井戸堀工事用の杭圧入用先端具の構成を説明するための図。
【図４】本発明の他の実施形態による鋼管杭圧入用先端具の構成を説明するための図。
【図５】従来の鋼管杭圧入用先端具の構成を説明するための図。
【符号の説明】
１，１１，２１，３１，４１，５１，Ｂ 鋼管杭圧入用先端具
２，１２，２２，３２，４２，５２ 先端部
３，１３，２３，３３，４３，５３ 背面部
３ａ 下端
３ｂ 上端
３ｃ，２３ｃ 開口部
４ａ，４ｂ，４ｃ，Ａ 鋼管杭
１４，１５ 掘削刃
１４ａ，１５ａ 掘削刃の先端
１６，１７ 窪み
２３ｃ 開口部
２４ 穴[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a steel pipe pile press-fitting tool for rotationally press-fitting a steel pile into a ground for use as a foundation pile, groundwater use or boring survey, and a steel pipe pile to which the tip is attached.
[0002]
[Prior art]
Conventionally, to inject foundation piles for civil engineering and construction work (often buried after being injected) into the ground, or to insert piles for boring surveys (pulled out after the injection) into the ground. In order to facilitate press fitting to the lower end of a steel pipe pile, a tip is fixed by welding or the like. This tip is used regardless of the method of press-fitting the pile. In the past, there were many hitting methods and vibration methods for press-fitting piles.However, due to problems such as noise and vibration damage to nearby residents, recently a spiral drilling blade was installed. In many cases, a rotating method is employed in which the tip is rotated and excavated and pressed into the ground in the vertical direction (for example, see Patent Document 1).
[0003]
FIG. 5 is a view showing an example of a steel pipe pile A and a steel pipe pile press-fitting tip B fixed to the tip of the steel pipe pile A, which is conventionally used. In the example shown in FIG. 5, the upper surface of the tip tool B is fixed to the lower end of the steel pipe pile A by welding (see FIG. 5B). Conventionally, a tip tool B is welded and fixed to each steel pipe pile A in a factory in advance, and they are stored in a warehouse, and only those required at the construction site are transported from the warehouse to the construction site.
[Patent Document 1]
JP-A-11-256576
[Problems to be solved by the invention]
However, as described above, the conventional steel pipe pile press-fitting tips were previously fixed to each foundation pile (or survey pile) at the factory and stored in a warehouse. It is necessary to manufacture as many types of tip tools as the number of types of piles having different diameters, and there is a problem that the manufacturing cost of the tip tools increases.
[0005]
Moreover, in the conventional pile press-fitting tip provided with a spiral excavation blade on the outer peripheral surface, there is a problem that in the process of press-fitting, a hard stone in the ground hits the excavation blade and the excavation blade is damaged. .
[0006]
Furthermore, in conventional well digging work, a stake with a tip tool is pressed into the ground to dig a hole for a well, and then the stake is pulled up and a pipe for further introducing well water is inserted. Thus, there was a problem that the construction cost of the well became high because multi-stage work was required.
[0007]
The present invention has been made in view of such a problem of the prior art, and a steel pipe capable of significantly reducing the number of types of tip press-fitting tools compared to conventional steel pipes and significantly reducing the manufacturing cost thereof. An object of the present invention is to provide a tip for press-fitting a pile and a steel pipe pile.
[0008]
Further, the present invention provides a steel pipe pile press-fitting tip which can prevent a spiral excavating blade provided on the steel pipe pile press-fitting tip from being damaged by hitting an underground stone or the like. Aim.
[0009]
Further, another object of the present invention is to provide a steel pipe pile press-fitting tip tool and a steel pipe pile that can significantly reduce the construction cost of a well compared to the related art.
[0010]
[Means for Solving the Problems]
The steel pipe pile press-fitting tip according to the present invention for solving such a problem of the prior art is a tip for fixing the steel pipe pile to the tip of the pile when press-fitting the steel pipe pile into the ground, The part located on the opposite side of the press-fitted tip part and facing the pile gradually decreases in diameter from the outside to the inside and from the press-fitting tip side toward the pile. And a substantially tapered surface having a substantially tapered surface with a straight or curved cross section.
[0011]
Further, in the steel pipe pile press-fitting tip according to the present invention, one or a plurality of spiral excavation blades are provided at a tip portion of the tip fitting that is pressed into the ground, and It is preferable that a dent is formed near the rotation direction of the tip of the excavation blade for storing the soil excavated by the excavation blade in a compressed state.
[0012]
In addition, in the steel pipe pile press-fitting tip of the present invention, it is preferable that the substantially tapered surface is provided with a position deviation preventing means for preventing a position deviation from the steel tube pile.
[0013]
In the tip device for press-fitting steel pipe piles according to the present invention, it is preferable that the displacement prevention means is one or a plurality of concave depressions formed on the substantially tapered surface.
[0014]
Further, in the steel pipe pile press-fitting tip device of the present invention, it is preferable that the positional deviation preventing means is one or a plurality of protrusions formed on the substantially tapered surface.
[0015]
In the tip device for press-fitting steel pipe piles according to the present invention, it is preferable that the misalignment preventing means is an uneven surface formed on the substantially tapered surface.
[0016]
In the tip device for press-fitting steel pipe piles of the present invention, the displacement prevention means is one or a plurality of screws (screw prevention screws) insertion holes formed in the substantially tapered surface. Is desirable.
[0017]
Further, in the steel pipe pile press-fitting tip of the present invention, one or a plurality of holes are used to introduce groundwater into the steel pipe pile in the part or the substantially tapered surface to be pressed into the ground. It is desirable that a hole for the hole be formed.
[0018]
Further, the steel pipe pile to which the steel pipe pile press-fitting tip of the present invention is fixed has a lower end portion or an inner wall portion which abuts and is opposed to the substantially tapered surface, and has a positional deviation from the substantially tapered surface. It is preferable that a concave or convex portion for preventing the formation is formed.
[0019]
Further, the steel pipe pile to which the steel pipe pile press-fitting tip of the present invention is fixed has a hole or a plurality of holes in the vicinity of a lower end portion abutting on the substantially tapered surface, and the groundwater is supplied to the steel pipe pile. It is desirable that a hole for introducing into the inside of the pile is formed.
[0020]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG. 1A is a perspective view showing a tip 1 for press-fitting a steel pipe pile according to Embodiment 1. FIG. In FIG. 1 (a), reference numeral 2 denotes a tip portion formed such that a lower end 2a is sharpened so as to easily dig in the ground at the time of pile press-fitting, and 3 denotes a steel pipe pile located on the opposite side of the tip portion 2. And the rear part facing the same. In the first embodiment, the distal end portion 2 is formed in a conical shape whose lower end 2a is sharp in the drawing and whose diameter gradually increases toward the upper part in the drawing. The back portion 3 has a lower end 3a shown in the drawing continuous with an upper end 2b shown in the front end portion 2, and the upper end 3b in the drawing forms a circular opening 3c. It is formed in a tapered shape having a linear cross section whose diameter gradually decreases as it proceeds toward the upper end 3b.
[0021]
Further, the steel pipe pile press-fitting tip 1 of the first embodiment is formed of a casting. Specific components of this casting are, for example, C (carbon), Si (silica), Mn (manganese), P (phosphorus), S (sulfur), Cr (potassium), Mo (molybdenum), V (vanadium) ), Etc., and examples of their mixing ratios are as shown in the following table.
[0022]
[Table 1]

[0023]
Next, a method of using the steel pipe pile press-fitting tip 1 according to the first embodiment will be described with reference to FIGS. The first embodiment is characterized in that one type of tip 1 can be shared for a plurality of types of steel pipe piles 4a, 4b, 4c having different diameters. That is, when the steel pipe pile 4a having a relatively small diameter is pressed into the ground, as shown in FIG. 1 (b), the tip of the steel pipe pile 4a is connected to the upper end of the tapered surface of the back part 3 of the tip tool 1. The tip 1 can be fixed to the steel pipe pile 4a by abutting and welding the vicinity of the portion 3b (the portion having a small diameter) (5a is a welded portion in the figure). When the steel pipe pile 4b having a medium diameter is pressed into the ground, the tip of the steel pipe pile 4b is positioned at the center of the tapered surface of the back part 3 of the tip tool 1 as shown in FIG. The tip 1 can be fixed to the steel pipe pile 4b by abutting and welding a portion (a portion having a medium diameter) (5b is a welded portion in the figure). When the steel pipe pile 4c having a relatively large diameter is pressed into the ground, as shown in FIG. 1D, the tip of the steel pipe pile 4c is connected to the lower end of the tapered surface of the back part 3 of the tip device 1. The tip 1 can be fixed to the steel pipe pile 4c by abutting and welding to a portion near the 3a (a portion having a large diameter) (5c is a welded portion in the figure).
[0024]
As described above, according to the first embodiment, one type of the distal end tool 1 is diametrically connected to each other within, for example, a range of about 100 to 150 mm (or a range of about 200 to 260 mm, or a range of about 300 to 400). Can be fixed and used in common for multiple types of steel pipe piles of different types, greatly reducing the types of tips, significantly reducing the manufacturing cost of the tips, and The cost can be reduced.
[0025]
In particular, in the first embodiment, by simply preparing one type of tip 1, at a construction site, selecting a desired type of steel pipe pile from a plurality of types of foundation piles having different diameters from each other, In addition, since the tip 1 can be used by welding, there is no need to store various types of steel pipe piles to which the tip is fixed in advance in a warehouse as in the related art. Therefore, according to the first embodiment, it is possible to flexibly cope with selecting a steel pipe pile to be used in construction on site, and welding and fixing a tip tool that can be shared with various types of steel pipe pile on site. This eliminates the need to store a large amount of steel pipe piles (fixed tip tools) that are not planned to be used immediately in the warehouse as in the past, thus greatly reducing construction costs. It becomes possible to reduce.
[0026]
Further, in the first embodiment, as the rear portion 3 opposite to the tip portion that is pressed into the ground goes from the outside to the inside, and from the lower side in the figure (the press-in tip side) toward the upper side in the figure (the direction of the pile). Because it is formed in a tapered shape whose diameter gradually decreases, for example, when it is necessary to pull out a press-fitted pile to the ground when making a mistake in the press-fitting place of a pile or when pressing a pile for investigation, pull out In some cases, the resistance of the soil can be minimized, and the extraction operation can be performed extremely easily. (On the other hand, when the back surface portion 3 is not formed in a tapered shape, the soil becomes a resistance during the extraction. And cannot be easily pulled out).
[0027]
(Embodiment 2) Next, FIG. 2 (a) is a perspective view showing a tip 11 for press-fitting steel pipe piles according to Embodiment 2 of the present invention, and FIG. 2 (b) shows the tip 11 of FIG. 2 (a). It is a perspective view which shows the state when seen from an upside-down (down) direction. In FIG. 2, reference numeral 12 denotes a substantially conical tip that serves as a press-fitting tip when pressed into the ground, and reference numeral 13 denotes a tapered back face located opposite to the tip 12 and facing the steel pipe pile.
[0028]
In the second embodiment, two spiral excavating blades 14 and 15 are provided on the outer surface of the distal end portion 12. In the second embodiment, recesses 16 and 17 are formed in the distal end portion 12 in the vicinity of the distal ends 14a and 15a of the excavating blades 14 and 15 in the rotation direction. These depressions 16 and 17 are for storing soil excavated by the excavation blades 14 and 15 in a compressed state.
[0029]
That is, in the second embodiment, since the recesses 16 and 17 as described above are formed in the distal end portion 12 of the steel pipe pile press-fitting tip 11, the tip 11 is pressed into the ground and the excavation blades 14 and 17 are pressed. When the soil is excavated by the excavator 15, the excavated soil does not immediately move upward along the excavation blades 14 and 15, but is temporarily stored in the depressions 16 and 17 and compressed. As a result, the soil and stones excavated in the ground by the excavation blades 14 and 15 first strike the soil that is stored in the depressions 16 and 17 and compressed before striking the excavation blades 14 and 15. Therefore, according to the second embodiment, for example, even when the excavation blades 14 and 15 excavate hard stones in the ground, the stones accumulate in the depressions 16 and 17 before hitting the excavation blades 14 and 15. Since the rocks hit the soil, the stones effectively prevent the drilling blades 14 and 15 from being damaged.
[0030]
Third Embodiment Next, FIG. 3 is a perspective view showing a steel pipe pile press-fitting tip 21 according to a third embodiment of the present invention. In FIG. 3, reference numeral 22 denotes a conical distal end serving as a press-fitting distal end of the distal end tool 21, reference numeral 23 denotes a tapered rear surface located opposite to the distal end 22 and facing the pile, and reference numeral 23 c denotes the rear surface 23. Is an opening formed in the center of the upper part of the drawing (the side facing the pile).
[0031]
The tip tool 21 according to the third embodiment is intended to be used for well digging work. In the tip device 21 of the third embodiment, a plurality of holes 24 are formed in the tip portion 22. The hole 24 is for introducing groundwater into the inside of the tip tool 21 and for introducing the groundwater into the pipe-shaped pile through the opening 23c.
[0032]
That is, when a well digging work is performed using the tip 21 of the third embodiment, the tip 21 is welded and fixed to a steel pipe pile (not shown), and the tip 21 and the pile are put underground. Press into. When the tip tool 21 reaches the groundwater, the tip tool 21 and the pile are buried and killed, and groundwater is introduced into the pile from the hole 24 of the tip tool 21 to raise the potable water. Use it for
[0033]
In the conventional well excavation work, (1) a steel pipe provided with a bit (tip) having a diameter of, for example, 8 to 10 mm is pressed into the ground, (2) the steel pipe is once drawn, and (3) after the drawing. The construction cost of the well became high because it was necessary to go through at least three steps of inserting a pipe for introducing groundwater into the formed hole. On the other hand, if the tip 21 of the third embodiment is used, the groundwater is made into potable water or the like by a single process of pressing the steel pipe with the tip 21 into the ground to bury the steel pipe. Therefore, the construction cost of the well can be significantly reduced.
[0034]
The embodiments of the present invention have been described above. However, the present invention is not limited to these, and various modifications can be made. For example, in each of Embodiments 1-3 described above, as the steel pipe pile press-fitting tip, both the conical tip portion and the tapered back portion are formed with straight sections. However, in the present invention, the cross section may include one having a curved shape.
[0035]
That is, in the present invention, as shown in FIG. 4 (a), the tip tool 31 has a tip portion 32 which is a press-fitting tip that is press-fitted into the ground, and has a cross-sectional curved shape, and has a side facing the pile. May be formed in a tapered shape having a curved cross section. In addition, in the present invention, as shown in FIG. 4 (b), the tip 41 has a tip portion 42 that is a press-fitting tip that is press-fitted into the ground, and has a curved section, and has a side facing the pile. May be formed in a tapered shape having a linear cross section. Further, in the present invention, as shown in FIG. 4 (c), in the tip tool 51, the tip 52 serving as a press-fitting tip to be press-fitted into the ground is formed in a linear cross section (conical shape), and May be formed in a tapered shape having a curved cross section.
[0036]
Further, in the present invention, on the substantially tapered surface of the steel pipe pile press-fitting tip, a positional deviation preventing means for preventing positional deviation from the steel pipe pile, for example, one or a plurality of concave dents, Alternatively, a plurality of projections, an uneven surface, or one or a plurality of screws (position shift preventing screws) insertion holes may be provided.
[0037]
Further, in the present invention, the lower end portion or the inner wall portion of the steel pipe pile, which is in contact with the substantially tapered surface of the tip tool, has a concave shape or a concave shape for preventing a positional deviation from the substantially tapered surface. You may make it form a convex part.
[0038]
Further, in the present invention, in a portion near the lower end portion of the steel pipe pile, which is in contact with the substantially tapered surface of the tip tool, one or a plurality of holes are provided to allow groundwater to flow into the steel pipe pile. A hole for introduction may be formed.
[0039]
【The invention's effect】
As described above, in the steel pipe pile press-fitting tip device of the present invention, the portion facing the pile located on the side opposite to the tip portion that is pressed into the ground is formed in a substantially tapered shape. As a result, a plurality of types of piles having different diameters can be commonly fixed to the substantially tapered surface of one type of tip. Therefore, according to the present invention, one type of tip can be used in common for a plurality of types of piles having different diameters from each other. The manufacturing cost of the tool can be greatly reduced, and the cost of the press-fitting work of the pile can be significantly reduced.
[0040]
Further, in the present invention, by simply preparing one type of tip, at the construction site, selecting a desired type of pile from a plurality of types of piles having different diameters from each other, fixing the tip to it. Since it can be used for press-fitting, it is not necessary to store various types of piles to which a tip is fixed in advance in a warehouse or the like as in the related art. Therefore, according to the present invention, it is possible to flexibly deal with a situation in which a pile to be used in construction work is selected on site and a tip tool that can be used for various types of piles is welded and fixed on site. This eliminates the need to store a large number of piles (fixed tip tools) that are not planned to be used immediately in the warehouse as in the past, and greatly reduces construction costs. It becomes possible.
[0041]
Further, in the present invention, the diameter of the back surface opposite to the tip portion which is pressed into the ground is gradually reduced as going from the outside toward the inside and gradually from the press-fitting tip side toward the pile. Since it is formed, for example, when it is necessary to pull out a press-fitted pile to the ground when inserting a pile at the wrong place or when inserting a survey pile, minimize the soil resistance when pulling out. And the pull-out operation can be performed extremely easily.
[0042]
Further, in the present invention, since one or a plurality of depressions are formed near the press-fitting direction of the tip of the excavating blade provided at the tip of the steel pipe pile press-fitting tip, the tip is pressed into the ground. Then, when the excavation blade excavates the soil, the excavated soil is temporarily stored in the depression and compressed. Therefore, according to the present invention, the soil or stone excavated by the excavation blade in the ground first hits the soil accumulated in the depression and compressed before hitting the excavation blade. Therefore, according to the present invention, for example, even when the excavation blade excavates a hard stone in the ground, the stone hits the soil accumulated in the depression before hitting the excavation blade. Damage to the excavation blade is effectively prevented.
[0043]
Further, in the present invention, the substantially tapered surface of the steel pipe pile press-fitting tip has a position deviation preventing means (one or more concave depressions, one or more projections) for preventing deviation from the steel pipe pile. , Uneven surface, or one or a plurality of screw insertion holes, etc.) so that the welded portion between the steel pipe pile and the tip tool can be positioned extremely easily and with high precision. Become. In addition, a concave or convex portion for preventing a positional deviation from the substantially tapered surface on a lower end portion or an inner wall portion of the steel pipe pile, which is in contact with and opposed to the substantially tapered surface of the tip tool. The same effect can be obtained also when forming.
[0044]
Further, in the present invention, one or more holes are formed at the tip of the steel pipe pile press-fitting tip, groundwater is introduced into the tip from the hole, and the groundwater is further transferred to the tip. Through the opening of the pipe-shaped pile. Therefore, according to the present invention, when performing well digging work, the tip tool of the present invention is fixed to a pipe-shaped pile and pressed into the ground, and when the tip tool reaches groundwater, the tip tool and By simply burying and killing the pile, groundwater can be introduced into the pipe-shaped pile from the hole of the tip tool and used for drinking water, etc. The construction cost of the construction can be greatly reduced. One or more holes for introducing groundwater into the inside of the steel pipe pile are provided in a portion near a lower end portion of the steel pipe pile which is in contact with the substantially tapered surface of the tip tool. The same effect can be obtained also when forming.
[Brief description of the drawings]
FIG. 1 is a view for explaining a configuration and a method of using a steel pipe pile press-fitting tip according to a first embodiment of the present invention.
FIG. 2 is a view for explaining a configuration of a steel pipe pile press-fitting tip according to a second embodiment of the present invention.
FIG. 3 is a view for explaining a configuration of a tip for press-fitting a pile for well digging work according to a third embodiment of the present invention.
FIG. 4 is a view for explaining the configuration of a steel pipe pile press-fitting tip according to another embodiment of the present invention.
FIG. 5 is a view for explaining a configuration of a conventional steel pipe pile press-fitting tip.
[Explanation of symbols]
1,11,21,31,41,51, B Tip for steel pipe pile press-fitting 2,12,22,32,42,52 Tip 3,13,23,33,43,53 Back part 3a Lower end 3b Upper end 3c , 23c Openings 4a, 4b, 4c, A Steel pipe piles 14, 15 Drilling blades 14a, 15a Drilling blade tips 16, 17 Recess 23c Opening 24 holes

Claims (10)

A tip tool for fixing the steel pipe pile to the tip of the pile when rotating press-fitting into the ground,
The portion located on the opposite side of the tip portion that is pressed into the ground and facing the pile gradually moves from the outside toward the inside and from the press-fitting tip side toward the pile. A tip fitting for steel pipe pile press-fitting, characterized in that it is formed to have a substantially tapered surface whose diameter is reduced and a substantially tapered surface whose cross section is straight or curved. In Claim 1, one or more spiral digging blades are provided at the tip portion of the tip tool that is pressed into the ground, and near the rotation direction of the digging blade tip of the tip tool. A recess for storing soil excavated by the excavating blade is formed in the tip for steel pipe pile press-fitting. 3. The steel pipe pile press-fitting tip according to claim 1, wherein the substantially tapered surface is provided with a deviation preventing means for preventing deviation from the steel pipe pile. The tip fitting for steel pipe pile press-fitting according to claim 3, wherein the displacement preventing means is one or a plurality of concave depressions formed on the substantially tapered surface. The tip fitting for press-fitting steel pipe piles according to claim 3, wherein the displacement preventing means is one or a plurality of protrusions formed on the substantially tapered surface. The tip fitting for press-fitting steel pipe piles according to claim 3, wherein the displacement preventing means is an uneven surface formed on the substantially tapered surface. The tip fitting for press-fitting steel pipe piles according to claim 3, wherein the displacement preventing means is one or a plurality of screw insertion holes formed in the substantially tapered surface. In any one of Claims 1-7, in order to introduce | transduce groundwater into the inside of the said steel pipe pile in one or several holes in the front-end | tip part or the said substantially tapered surface press-fitted in the ground. A tip for press-fitting steel pipe piles, wherein a hole is formed. A steel pipe pile to which the steel pipe pile press-fitting tip according to any one of claims 1 to 8 is fixed, wherein the substantially tapered surface is provided on a lower end portion or an inner wall portion facing the substantially tapered surface. A steel pipe pile, wherein a concave or convex portion for preventing deviation from the steel pipe is formed. A steel pipe pile to which the steel pipe pile press-fitting tip according to any one of claims 1 to 8 is fixed, wherein one or more pieces are provided near a lower end portion abutting on the substantially tapered surface. Wherein the hole for introducing groundwater into the steel pipe pile is formed.

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