JP6034348B2 - Prestressed steel pipe pile - Google Patents
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- JP6034348B2 JP6034348B2 JP2014195072A JP2014195072A JP6034348B2 JP 6034348 B2 JP6034348 B2 JP 6034348B2 JP 2014195072 A JP2014195072 A JP 2014195072A JP 2014195072 A JP2014195072 A JP 2014195072A JP 6034348 B2 JP6034348 B2 JP 6034348B2
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Description
本発明は、プレストレス鋼管杭に関する。 The present invention relates to a prestressed steel pipe pile.
鋼管杭は、材料強度が強く、容易に長尺化を図れることから、軟弱地盤の多い我が国において、橋梁基礎、港湾・臨海構造物基礎、建築基礎等の施工に広く利用されている。中でも近年は、杭基礎工法において、市街地等の狭隘な条件に適した、小口径の鋼管杭を用いることが多くなっている。 Steel pipe piles are widely used for construction of bridge foundations, harbor / seaside structure foundations, building foundations, etc. in Japan, where there are many soft grounds, because they have high material strength and can be easily elongated. In particular, in recent years, steel pipe piles with a small diameter suitable for narrow conditions such as urban areas have been frequently used in pile foundation construction methods.
従来の技術として、特許文献1には、外周面に環状またはらせん状に所定の寸法関係を有する節を設けた小口径の鋼管杭が開示されている。
特許文献1の発明によれば、外周面に設けた節によってセメント系グラウト材との付着力が確保されるため、小口径杭の支持力を十分に発揮することができるとしている。
As a conventional technique, Patent Document 1 discloses a small-diameter steel pipe pile provided with a node having a predetermined dimensional relationship in an annular shape or a spiral shape on an outer peripheral surface.
According to the invention of Patent Document 1, since the adhesion force with the cement-type grout material is ensured by the nodes provided on the outer peripheral surface, the supporting force of the small-diameter pile can be sufficiently exhibited.
しかし、従来の技術には次のような欠点があった。
<1>小口径杭は、径が小さいため、曲げ剛性が十分でなかった。
<2>小口径杭を採用する場合、所定の支持力を得るため、多数打設しなければならなかった。そのため施工コストが高かった。
<3>杭の打設には大型の建機を用いるため、狭隘な土地では施工が困難だった。
However, the conventional technique has the following drawbacks.
Since the <1> small-diameter pile has a small diameter, the bending rigidity was not sufficient.
<2> When adopting small-diameter piles, many had to be placed in order to obtain a predetermined supporting force. Therefore, the construction cost was high.
<3> Construction of a pile was difficult because it used a large construction machine.
本発明の目的は、次の効果のうち少なくともひとつを有する、プレストレス鋼管杭を提供することにある。
<1>小口径でありながら高い曲げ剛性を有すること。
<2>打設本数を減らすことができ、施工コストを削減できること。
<3>施工性が良く、狭隘な土地でも効率よく施工できること。
An object of the present invention is to provide a prestressed steel pipe pile having at least one of the following effects.
<1> Having high bending rigidity while having a small diameter.
<2> The number of placements can be reduced, and the construction cost can be reduced.
<3> Good workability and efficient construction even in narrow land.
上記のような課題を解決するための、本発明のプレストレス鋼管杭は、両端を開口した拘束管と、拘束管の両端を封鎖可能な、2つのキャップ部と、拘束管の内部に封入した、固結材と、拘束管を挿通可能な全長を有する、引張材と、を有し、キャップ部に反力を得て、引張材を緊張して、拘束管にプレストレスを付与しつつ、拘束管で固結材を拘束したことを特徴とする。 The prestressed steel pipe pile of the present invention for solving the above-described problems is sealed in a restraint pipe having both ends opened, two cap portions capable of sealing both ends of the restraint pipe, and the inside of the restraint pipe. , Having a total length that can be inserted through the constraining material and the constraining tube, having a reaction force in the cap part, tensioning the tensile material, and applying prestress to the constraining tube, It is characterized in that the consolidated material is restrained by a restraint tube.
本発明のプレストレス鋼管杭は、拘束管を、複数の分割拘束管で構成し、複数の分割拘束管を引張材で一体に連結したことを特徴とする。 The prestressed steel pipe pile of the present invention is characterized in that the restraint pipe is constituted by a plurality of split restraint pipes, and the plurality of split restraint pipes are integrally connected by a tensile material.
本発明のプレストレス鋼管杭は、分割拘束管を、螺合、嵌合、又は溶接のいずれか一つの接合手段で連結したことを特徴とする。 The prestressed steel pipe pile of the present invention is characterized in that the divided constraining pipes are connected by any one joining means of screwing, fitting, or welding.
本発明のプレストレス鋼管杭は、引張材が、PC鋼棒、PC鋼より線、又はアラミド繊維のいずれか一つ、若しくはこれらの組合せであることを特徴とする。 The prestressed steel pipe pile of the present invention is characterized in that the tensile material is any one of a PC steel bar, a PC steel stranded wire, an aramid fiber, or a combination thereof.
本発明のプレストレス鋼管杭は、以上説明した構成を有するため、次の効果の少なくともひとつを備える。
<1>拘束管にプレストレスを付与したため、小口径でありながら高い曲げ剛性を発揮できる。
<2>曲げ剛性が高いため、従来の小口径鋼管杭より打設する本数を減らすことができる。また、既設構造物の補強時、打設本数を減らすことで、コンクリートの増厚量を減らすことができる。このため、施工コストを大幅に削減できる。
<3>小口径なので小型の建機で打設できる。そのため、建築物の密集した狭隘な施工場所でも容易に施工でき、施工性が非常に高い。
<4>分割した拘束管を打ち継ぐことができる。そのため、打設場所の上部空間に制約がある場所でも長尺の鋼管杭を打設できる。
Since the prestressed steel pipe pile of the present invention has the above-described configuration, it has at least one of the following effects.
<1> Since prestress is imparted to the constraining pipe, high bending rigidity can be exhibited while having a small diameter.
<2> Since the bending rigidity is high, the number of casts can be reduced from the conventional small-diameter steel pipe pile. Moreover, the thickness of concrete can be reduced by reducing the number of placements when reinforcing existing structures. For this reason, construction cost can be reduced significantly.
<3> Since it has a small diameter, it can be placed with a small construction machine. Therefore, it can be easily constructed even in a narrow and dense construction place of a building, and the workability is very high.
<4> The divided restraint pipe can be succeeded. Therefore, it is possible to place a long steel pipe pile even in a place where the upper space of the placement place is restricted.
以下、図面を参照しながら本発明の、プレストレス鋼管杭について詳細に説明する。 Hereinafter, the prestressed steel pipe pile of the present invention will be described in detail with reference to the drawings.
[プレストレス鋼管杭]
<1>全体の構成(図1)。
本発明のプレストレス鋼管杭1は、拘束管10に軸線方向の引張力を付与した、小口径の鋼管杭である。
プレストレス鋼管杭1は、拘束管10と、キャップ部20と、固結材30と、引張材40と、を備える。
[Prestressed steel pipe pile]
<1> Overall configuration (FIG. 1).
The prestressed steel pipe pile 1 of the present invention is a small-diameter steel pipe pile in which an axial tensile force is applied to the constraining pipe 10.
The prestressed steel pipe pile 1 includes a restraint pipe 10, a
<2>拘束管。
拘束管10は、プレストレス鋼管杭1の主部材をなす鋼管である。本例ではφ100〜200mm程度の既成の円筒形鋼管を採用する。
拘束管10の周面には、穿孔50内で周囲に充填される注入材60との定着性を高めるため、節状等の突起を設けることができる。
<2> Restraint tube.
The restraint pipe 10 is a steel pipe that forms the main member of the prestressed steel pipe pile 1. In this example, an existing cylindrical steel pipe having a diameter of about 100 to 200 mm is employed.
On the peripheral surface of the constraining tube 10, a protrusion such as a node shape can be provided in order to improve the fixing property with the injection material 60 filled in the perforation 50.
<3>キャップ部。
キャップ部20、20は、拘束管10の両端を被覆すると同時に、引張材40による圧縮力を拘束管10に伝達しつつ、拘束管10内の固結材30を拘束する部材である。
キャップ部20は、拘束管10の端部を塞ぐ支圧板21と、引張材40の端部に連結する定着具23と、定着具23に付与された圧縮力を支圧板21に伝達する押え材22と、を含む。
支圧板21は、本例では、円形の板状体とする。支圧板21の拘束管10側の面には、拘束管10の内面に嵌合する突出部を設ける。
支圧板21、押え材22、定着具23は、それぞれ独立の部材とするほか、一体構造とすることができる。
<3> A cap part.
The
The
The bearing plate 21 is a circular plate-like body in this example. On the surface of the bearing plate 21 on the side of the restraint tube 10, a protrusion that fits into the inner surface of the restraint tube 10 is provided.
The bearing plate 21, the presser member 22, and the fixing tool 23 may be independent members or may be integrated.
<4>固結材。
固結材30は、拘束管10の内部に充填する硬化性の中詰材である。
本例では、固結材30に、セメントグラウト材を採用する。その他モルタルや合成樹脂等の素材を採用することもできる。
固結材30は、硬化し、拘束管10内に拘束されることによって、拘束管10と一体化し、プレストレス鋼管杭1の剛性を向上させる。
<4> Consolidated material.
The consolidated material 30 is a curable filling material that fills the inside of the restraint tube 10.
In this example, a cement grout material is used for the consolidated material 30. Other materials such as mortar and synthetic resin can also be used.
The consolidated material 30 is cured and constrained in the constraining tube 10 so as to be integrated with the constraining tube 10 and improve the rigidity of the prestressed steel pipe pile 1.
<5>引張材。
引張材40は、キャップ部20を介して拘束管10にプレストレスによる圧縮力を与える部材である。
本例では、引張材40に、PC鋼棒を採用する。その他PC鋼線、PC鋼より線、アラミド繊維等の公知の材料を採用することができる。また複数本の素材を組合わせてもよい。
引張材40の両端はキャップ部20の支圧板21と押え材22を貫通し、定着具23に連結される。
<5> Tensile material.
The tension member 40 is a member that applies a compressive force due to prestress to the restraint tube 10 through the
In this example, a PC steel rod is adopted as the tension member 40. Other known materials such as PC steel wires, PC steel strands, and aramid fibers can be used. A plurality of materials may be combined.
Both ends of the tension member 40 pass through the pressure plate 21 and the pressing member 22 of the
[プレストレス鋼管杭の製造方法]
引き続き、本発明のプレストレス鋼管杭の製造方法について詳細に説明する。
[Prestressed steel pipe pile manufacturing method]
Then, the manufacturing method of the prestressed steel pipe pile of this invention is demonstrated in detail.
<1−1>拘束管の第一開口端の封鎖。
拘束管10の一方の開口端に、支圧板21の突出部を嵌め込む。
支圧板21の外側の面に押え材22を載せる。
引張材40の一端に定着具23を連結し、他端を、押え材22、支圧板21の中央孔に連通し、拘束管10の反対側の開口から突出させる。
<1-1> Blocking of the first open end of the restraint tube.
The protruding portion of the support plate 21 is fitted into one open end of the restraint tube 10.
The presser material 22 is placed on the outer surface of the bearing plate 21.
The fixing tool 23 is connected to one end of the tension member 40, and the other end communicates with the presser member 22 and the central hole of the bearing plate 21, and protrudes from the opening on the opposite side of the restraint tube 10.
<1−2>固結材の注入。
拘束管10を、開口側を上方に向けて立て、固結材30を拘束管10の内部に、縁近くまで充填する。
<1-2> Injection of consolidated material.
The restraint tube 10 is erected with the opening side facing upward, and the consolidated material 30 is filled into the restraint tube 10 to the vicinity of the edge.
<1−3>拘束管の第二開口端の被覆(図2)。
拘束管10の開口側を支圧板21で覆う。この時、支圧板21の突出部を拘束管10の管内に嵌め込み、支圧板21の中央孔に、引張材40の先端を挿通させる。
支圧板21の上部に押え材22を設置する。押え材22の中央孔から引張材40を突出させる。
<1-3> Covering of the second open end of the restraint tube (FIG. 2).
The opening side of the restraint tube 10 is covered with a bearing plate 21. At this time, the protruding portion of the bearing plate 21 is fitted into the tube of the restraint tube 10, and the tip of the tension member 40 is inserted into the central hole of the bearing plate 21.
The presser material 22 is installed on the upper part of the bearing plate 21. The tension member 40 is protruded from the center hole of the presser member 22.
<1−4>プレストレスの導入。
拘束管10両端の支圧板21、21から反力を得て、ジャッキ等で引張材40を緊張し、引張力を加える。
引張材40に定着具23を接合し、ジャッキを開放して、キャップ部20、20を介して、拘束管10にプレストレスを導入する。
引張材40の突出した端部を適当な長さに切断する。
<1-4> Introduction of prestress.
A reaction force is obtained from the pressure bearing plates 21 and 21 at both ends of the restraint tube 10, and the tension member 40 is tensioned with a jack or the like to apply a tensile force.
The fixing tool 23 is joined to the tension member 40, the jack is opened, and prestress is introduced into the restraint tube 10 through the
The protruding end of the tension member 40 is cut to an appropriate length.
<1−5>その他の方法。
本例のプレストレス鋼管杭1の製造方法は一例であり、他の公知の方法、例えば、拘束管10の両端を封鎖した後に、注入孔から固結材30を注入したり、プレストレスの導入をプレテンション方式にする等を採用してもよい。
<1-5> Other methods.
The manufacturing method of the prestressed steel pipe pile 1 of this example is an example, and other well-known methods, for example, after sealing the both ends of the restraint pipe 10, inject | pour the consolidated material 30 from an injection hole, or introduce prestress It is also possible to adopt a pre-tension method.
<2>プレストレスの効果。
拘束管10は、引張材40によるプレストレスを受けて、軸方向に圧縮されることで、曲げ剛性が高まる。
また、拘束管10内の固結材30も、支圧板21の突出部を介して引張材40の圧縮力を受ける。これによって固結材30自体の強度も向上する。
このため、従来大口径の場所打ち杭等で施工していた補強構造等に、杭径φ100〜200mm程度の小口径杭を採用することができ、施工コストを大幅に低減することができる。また、小型の機器で施工できるため、施工性が非常に高い。
<2> Prestress effect.
The restraint tube 10 is subjected to prestress by the tensile material 40 and is compressed in the axial direction, whereby the bending rigidity is increased.
Further, the consolidated material 30 in the constraining tube 10 also receives the compressive force of the tensile material 40 through the protruding portion of the bearing plate 21. This also improves the strength of the consolidated material 30 itself.
For this reason, a small-diameter pile having a pile diameter of about φ100 to 200 mm can be employed for a reinforcing structure or the like that has been conventionally constructed with a large-diameter cast-in-place pile or the like, and the construction cost can be greatly reduced. Moreover, since it can construct with a small apparatus, workability is very high.
[拘束管を分割構造とした他の例]
拘束管10を複数の分割拘束管10Aの連結構造とした他の実施例について説明する(図3)。
本例では、拘束管10は分割構造であり、複数の分割拘束管10Aを、軸線方向に連結してなる。
分割拘束管10A同士の連結には、螺合、嵌合、溶接等の公知の接合手段を採用する。分割拘束管10Aの端部に、螺合用のネジ部等の連結機構11を設けることもできる。
すべての分割拘束管10Aを連結した後に、内部に連通した引張材40で両端部のキャップ部20、20にプレストレスを付与し、分割拘束管10A同士を軸線方向に圧縮することで、一体に連結する。
本例の場合、穿孔50内に、短尺の分割拘束管10Aを1本ずつ挿入し、穿孔50内で連結することができるため、打設場所の上方に空間上の制限がある場合でも、長尺のプレストレス鋼管杭1を形成することができる。
[Another example of a constrained pipe divided structure]
Another embodiment in which the restraint tube 10 is connected to a plurality of
In this example, the restraint tube 10 has a split structure, and is formed by connecting a plurality of
A known joining means such as screwing, fitting, welding or the like is employed for connecting the divided restricting
After connecting all the divided constraining
In the case of this example, since the short divided
1 プレストレス鋼管杭
10 拘束管
10A 分割拘束管
11 連結機構
20 キャップ部
21 支圧板
22 押え材
23 定着具
30 固結材
40 引張材
50 穿孔
DESCRIPTION OF SYMBOLS 1 Prestressed steel pipe pile 10
Claims (4)
前記拘束管の両端を封鎖可能な、2つのキャップ部と、
前記拘束管の内部に封入されている、固結材と、
前記拘束管を挿通可能な全長を有する、引張材と、を有し、
前記キャップ部に反力を得て、前記引張材が緊張されていることにより、前記拘束管にプレストレスが付与されており、前記拘束管によって前記固結材が拘束されていることを特徴とする、
プレストレス鋼管杭。 A restraint tube open at both ends;
Two cap portions capable of sealing both ends of the restraint tube;
A consolidated material enclosed in the restraint tube;
A tensile material having a total length through which the restraint tube can be inserted, and
To give a reaction force to the cap portion, by said tension member is tensioned, it said has prestress is applied to the restraining tube, and wherein said caking material is restrained by the restraining pipe To
Prestressed steel pipe pile.
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JPH093886A (en) * | 1995-06-20 | 1997-01-07 | Minoru Tomita | Concrete steel pipe compressed material |
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