JP2005139703A - Reinforcing construction method of existing concrete pile - Google Patents

Reinforcing construction method of existing concrete pile Download PDF

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JP2005139703A
JP2005139703A JP2003376671A JP2003376671A JP2005139703A JP 2005139703 A JP2005139703 A JP 2005139703A JP 2003376671 A JP2003376671 A JP 2003376671A JP 2003376671 A JP2003376671 A JP 2003376671A JP 2005139703 A JP2005139703 A JP 2005139703A
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steel pipe
existing
pile
concrete
diameter
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Kenzo Aoki
健三 青木
Kazuyuki Miyamoto
和徹 宮本
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Toyo Techno Corp
Marugo Foundation Corp
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Toyo Techno Corp
Marugo Foundation Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcing construction method of an existing concrete pile, capable of inexpensively and diametrally expanding a head part of an existing steel pipe concrete pile to a steel pipe concrete structure having a further large diameter, by facilitating the connection of a shaft part of a pile and a diametrally expanding part. <P>SOLUTION: In this reinforcing construction method of the existing concrete pile for arranging a steel pipe 1 in a pile head part, a reinforcement 2 is extended upward from the steel pipe 1 arranged in the pile head part; a diametrally expanding steel pipe 3 having a large diameter is arranged on the outer periphery of this reinforcement 2; and concrete 4 is placed inside this diametrally expanding steel pipe 3. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

本発明は、既設コンクリート杭の補強工法に関し、特に、杭の軸部と拡径部との接続を容易にし、既設鋼管コンクリート杭や既設場所打ちコンクリート杭の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる既設コンクリート杭の補強工法に関するものである。   The present invention relates to a method for reinforcing an existing concrete pile, and in particular, facilitates connection between a shaft portion and a diameter-expanded portion of a pile, and a steel pipe concrete structure having a larger diameter than the head of an existing steel pipe concrete pile or an existing cast-in-place concrete pile. The present invention relates to a method for reinforcing an existing concrete pile that can be expanded at low cost.

鋼管コンクリート杭を構築した後、上部構造物の設計が変更になり、構築した鋼管コンクリート杭では、水平耐力が不足するような場合には、鋼管コンクリート杭の構築本数を増やす等の対処が必要になり、コストがかかるという問題があった。   After the construction of steel pipe concrete piles, the design of the superstructure has been changed, and if the steel pipe concrete piles built have insufficient horizontal strength, it is necessary to take measures such as increasing the number of steel pipe concrete piles constructed. Therefore, there is a problem that costs are high.

ところで、この対処方法として、既設鋼管コンクリート杭の頭部を拡径して、さらに径の大きい鋼管コンクリート構造とすることが考えられるが、径の異なる鋼管同士を接続する方法として、図２に示すような、円板７１やテーパー管７２、リブプレート７３を採用すると、円板７１やテーパー管７２は拡径が大きくなった場合（特に軸部径がφ１５００ｍｍ以上の場合）、材料費及び加工費が非常に高価なものとなり、また、リブプレート７３は軸部Ｔ１と拡径部Ｔ２の直径の差が６００ｍｍ以上（隙間が３００ｍｍ以上）ないとリブプレート７３と拡径用鋼管３との溶接が困難であるという問題があった。さらに、拡径用鋼管３として内面リブ付鋼管を使用する場合は、リブプレート７３が当たる内面リブを削る必要が生じるが、この研削はガスを用いると拡径用鋼管３を傷付けるおそれがあるため、グラインダーにて行う必要があり、その結果、加工費が非常に高価なものとなるという問題があった。   By the way, as a coping method, it is conceivable to enlarge the head of the existing steel pipe concrete pile to obtain a steel pipe concrete structure having a larger diameter. As a method for connecting steel pipes having different diameters, FIG. When the circular plate 71, the tapered tube 72, and the rib plate 73 are employed as described above, when the diameter of the circular plate 71 and the tapered tube 72 is increased (particularly when the diameter of the shaft is φ1500 mm or more), the material cost and the processing cost are increased. The rib plate 73 is welded to the rib plate 73 and the steel pipe 3 for diameter expansion unless the difference in diameter between the shaft portion T1 and the diameter expanded portion T2 is 600 mm or more (the gap is 300 mm or more). There was a problem that it was difficult. Furthermore, when using a steel pipe with an inner surface rib as the diameter expansion steel pipe 3, it is necessary to cut the inner surface rib against which the rib plate 73 hits. However, this gas may damage the diameter expansion steel pipe 3 if gas is used. Therefore, there is a problem that it is necessary to carry out with a grinder, and as a result, the processing cost becomes very expensive.

また、上記の場合のほか、既設の構造物を取り壊して新しい構造物を構築する場合には、基礎を構築し直すことが通常行われているが、既設の基礎の取り壊しや新しい基礎の構築に、手数とコストがかかるという問題があった。   In addition to the above cases, when constructing a new structure by demolishing an existing structure, it is common practice to rebuild the foundation. There was a problem that it took time and money.

さらに、これらのことは、既設鋼管コンクリート杭のほか、既設場所打ちコンクリート杭についてもいえることであった。   In addition to the existing steel pipe concrete piles, these were also true for the existing cast-in-place concrete piles.

本発明は、上記の既設コンクリート杭に係る問題点に鑑み、杭の軸部と拡径部との接続を容易にし、既設鋼管コンクリート杭や既設場所打ちコンクリート杭の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる既設コンクリート杭の補強工法を提供することを目的とする。   In view of the problems associated with the above-described existing concrete pile, the present invention facilitates the connection between the shaft portion and the expanded diameter portion of the pile, and the head of the existing steel pipe concrete pile or the existing cast-in-place concrete pile has a larger diameter. An object of the present invention is to provide a method for reinforcing an existing concrete pile that can be expanded to a concrete structure at low cost.

上記目的を達成するため、本第１発明の既設コンクリート杭の補強工法は、少なくとも杭頭部に鋼管を配設した既設コンクリート杭の補強工法において、杭頭部に配設した鋼管から上方に鉄筋を延設するとともに、該鉄筋の外周に大径の拡径用鋼管を配設し、該拡径用鋼管の内部にコンクリートを打設することを特徴とする。   In order to achieve the above object, the method for reinforcing an existing concrete pile according to the first aspect of the present invention is a reinforcing method for an existing concrete pile in which a steel pipe is disposed at least at the pile head. And a large-diameter expansion steel pipe is disposed on the outer periphery of the reinforcing bar, and concrete is placed inside the expansion-diameter steel pipe.

また、同じ目的を達成するため、本第２発明の既設コンクリート杭の補強工法は、内部に鉄筋を配した既設場所打ちコンクリート杭の補強工法において、既設場所打ちコンクリート杭の頭部の鉄筋を露出させるとともに、該鉄筋の外周に大径の拡径用鋼管を配設し、該拡径用鋼管の内部にコンクリートを打設することを特徴とする。   In order to achieve the same purpose, the existing concrete pile reinforcement method of the second invention is the reinforcement method of the existing cast-in-place concrete pile with the reinforcing bars inside, and the reinforcement of the head of the existing cast-in-place concrete pile is exposed. In addition, a large-diameter steel pipe for expanding the diameter is disposed on the outer periphery of the reinforcing bar, and concrete is placed inside the steel pipe for expanding the diameter.

本第１発明の既設コンクリート杭の補強工法によれば、既設鋼管コンクリート杭の杭頭部に配設した鋼管から上方に鉄筋を延設するとともに、鉄筋の外周に大径の拡径用鋼管を配設し、拡径用鋼管の内部にコンクリートを打設することから、この打設したコンクリートと鉄筋により拡径用鋼管と杭頭部の鋼管とを接続することができ、これにより、杭の軸部と拡径部との接続を容易にし、既設鋼管コンクリート杭の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる。   According to the reinforcing method of the existing concrete pile of the first invention, the reinforcing bar is extended upward from the steel pipe disposed on the pile head portion of the existing steel pipe concrete pile, and a large-diameter steel pipe for expanding the diameter is provided on the outer periphery of the reinforcing bar. Since the concrete is placed and the concrete is placed inside the steel pipe for expansion, the steel pipe for expansion and the steel pipe of the pile head can be connected by the placed concrete and the reinforcing bar. The connection between the shaft portion and the enlarged diameter portion is facilitated, and the head of the existing steel pipe concrete pile can be expanded at a low cost into a steel pipe concrete structure having a larger diameter.

また、本第２発明の既設コンクリート杭の補強工法によれば、既設場所打ちコンクリート杭の頭部の鉄筋を露出させるとともに、鉄筋の外周に大径の拡径用鋼管を配設し、拡径用鋼管の内部にコンクリートを打設することから、この打設したコンクリートと鉄筋により拡径用鋼管と杭頭部の鋼管とを接続することができ、これにより、杭の軸部と拡径部との接続を容易にし、既設場所打ちコンクリート杭の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる。   Moreover, according to the reinforcement method of the existing concrete pile of this 2nd invention, while exposing the reinforcement of the head of the existing cast-in-place concrete pile, arrange | positioning the large diameter steel pipe for diameter expansion on the outer periphery of a reinforcement, Since concrete is cast inside the steel pipe, the steel pipe for diameter expansion and the steel pipe at the head of the pile can be connected by the cast concrete and the reinforcing bar. And the head of the existing cast-in-place concrete pile can be expanded to a steel pipe concrete structure with a larger diameter at a low cost.

以下、本発明の既設コンクリート杭の補強工法の実施の形態を図面に基づいて説明する。   DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments of a method for reinforcing an existing concrete pile according to the present invention will be described with reference to the drawings.

図１に、本発明の既設コンクリート杭の補強工法の第１実施例を示す。
この既設コンクリート杭の補強工法は、杭頭部に鋼管１を配設した既設鋼管コンクリート杭Ｐ１の補強工法において、杭頭部に配設した鋼管１から上方に鉄筋２を延設するとともに、この鉄筋２の外周に大径の拡径用鋼管３を配設し、この拡径用鋼管３の内部にコンクリート４を打設し、この打設したコンクリート４と鉄筋２により拡径用鋼管３と既設場所打ちコンクリート杭Ｐ１の杭頭部の鋼管１とを接続するようにしたものである。 In FIG. 1, the 1st Example of the reinforcement construction method of the existing concrete pile of this invention is shown.
This existing concrete pile reinforcement method is the same as the reinforcement method of the existing steel pipe concrete pile P1 in which the steel pipe 1 is arranged at the pile head, and the reinforcing bars 2 are extended upward from the steel pipe 1 arranged at the pile head. A large-diameter steel pipe 3 for expanding the diameter is disposed on the outer periphery of the reinforcing bar 2, and concrete 4 is placed inside the steel pipe 3 for expanding the diameter. The steel pipe 1 of the pile head of the existing cast-in-place concrete pile P1 is connected.

具体的には、杭頭部の鋼管１の上部外側に周方向に複数の鉄筋２を溶接し、この鉄筋２に、拡径用鋼管３として径の大きい内面リブ付鋼管をかぶせ、この内面リブ付鋼管の内部にコンクリート４を打設することにより既設鋼管コンクリート杭Ｐ１の軸部Ｔ１と拡径部Ｔ２を接続している。
なお、図において、５は既設場所打ち鋼管コンクリート杭Ｐ１のコンクリート、６は鉄筋かごを示している。 Specifically, a plurality of reinforcing bars 2 are welded in the circumferential direction to the upper outer side of the steel pipe 1 at the head of the pile, and a steel pipe with an inner rib having a large diameter is applied to the reinforcing bar 2 as a steel pipe 3 for expanding the diameter. By placing concrete 4 inside the attached steel pipe, the shaft part T1 and the expanded diameter part T2 of the existing steel pipe concrete pile P1 are connected.
In addition, in the figure, 5 shows the concrete of the existing cast-in-place steel pipe concrete pile P1, and 6 has shown the reinforcing steel cage.

鉄筋２の定着長Ｌは、拡径用鋼管３からコンクリート４を介しての応力伝達により決まるが、一般的には４０ｄ（ｄ：鉄筋径）あれば充分である。
また、この鉄筋２を拡径用鋼管４の上部まで立ち上げて、拡径部Ｔ２を鋼管鉄筋コンクリート構造としてもよい。
また、拡径用鋼管３と杭頭部の鋼管１との直径の差は、拡径用鋼管３から鉄筋２への応力伝達をスムースにするためには３００ｍｍ以下が望ましい。
なお、鉄筋２の鋼管１への固着方法には、溶接のほか、鋼管１に雌ねじ部材（図示省略）を溶接し、この雌ねじ部材にねじ鉄筋を螺合する方法等、任意の固着方法を採用することができる。 The fixing length L of the reinforcing bar 2 is determined by the stress transmission from the steel pipe 3 for diameter expansion through the concrete 4, but generally 40d (d: diameter of the reinforcing bar) is sufficient.
Further, the reinforcing bar 2 may be raised up to the upper portion of the steel pipe 4 for diameter expansion, and the diameter-expanded portion T2 may have a steel pipe reinforced concrete structure.
Further, the difference in diameter between the steel pipe for diameter expansion 3 and the steel pipe 1 at the head of the pile is preferably 300 mm or less in order to smoothly transfer the stress from the steel pipe for diameter expansion 3 to the rebar 2.
In addition to welding, the fixing method of the reinforcing bar 2 to the steel pipe 1 employs any fixing method such as a method of welding a female screw member (not shown) to the steel pipe 1 and screwing the screw reinforcing bar into the female screw member. can do.

以下に、より具体的な実例を挙げる。
鋼管径１８００ｍｍ、板厚１４ｍｍの既設場所打ち鋼管コンクリート杭Ｐ１の上部に、鋼管径２０００ｍｍ、板厚１６ｍｍの拡径用鋼管３を設置する拡頭場所打ち鋼管コンクリート杭を築造するに当たり、既設杭の鋼管１の上部にＤ３２の鉄筋２を５６本溶接した。溶接長は１６０ｍｍ、定着長Ｌは１２８０ｍｍであった。 More specific examples are given below.
The steel pipe of the existing pile is used for the construction of the head-expansion cast-in-place steel pipe concrete pile in which the steel pipe diameter 2000mm and the plate thickness 16mm are installed on the upper part of the existing cast-in-place steel pipe concrete pile P1 having a steel pipe diameter of 1800mm and a plate thickness of 14mm. 56 D32 rebars 2 were welded to the top of 1. The welding length was 160 mm, and the fixing length L was 1280 mm.

この既設コンクリート杭の補強工法は、杭頭部に鋼管１を配設した既設鋼管コンクリート杭Ｐ１の補強工法において、杭頭部に配設した鋼管１から上方に鉄筋２を延設するとともに、この鉄筋２の外周に大径の拡径用鋼管３を配設し、この拡径用鋼管３の内部にコンクリート４を打設し、この打設したコンクリート４と鉄筋２により拡径用鋼管３と既設場所打ち鋼管コンクリート杭Ｐ１の杭頭部の鋼管１とを接続することができ、これにより、杭の軸部Ｔ１と拡径部Ｔ２との接続を容易にし、既設鋼管コンクリート杭Ｐ１の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる。
そして、この既設コンクリート杭の補強工法は、既設場所打ち鋼管コンクリート杭やＳＣ杭の補強に適している。 This existing concrete pile reinforcement method is the same as the reinforcement method of the existing steel pipe concrete pile P1 in which the steel pipe 1 is arranged at the pile head, and the reinforcing bars 2 are extended upward from the steel pipe 1 arranged at the pile head. A large-diameter steel pipe 3 for expanding the diameter is disposed on the outer periphery of the reinforcing bar 2, and concrete 4 is placed inside the steel pipe 3 for expanding the diameter. The steel pipe 1 of the pile head of the existing cast-in-place steel pipe concrete pile P1 can be connected, thereby facilitating the connection between the shaft portion T1 of the pile and the enlarged diameter portion T2, and the head of the existing steel pipe concrete pile P1 Can be expanded to a steel pipe concrete structure having a larger diameter at a low cost.
And this reinforcement method of an existing concrete pile is suitable for reinforcement of the existing cast-in-place steel pipe concrete pile and SC pile.

図３に、本発明の既設コンクリート杭の補強工法の第２実施例を示す。
この既設コンクリート杭の補強工法は、内部に鉄筋６を配した既設場所打ちコンクリート杭Ｐ２の補強工法において、既設場所打ちコンクリート杭Ｐ２の頭部の鉄筋６を露出させるとともに、この鉄筋６の外周に大径の拡径用鋼管３を配設し、この拡径用鋼管３の内部にコンクリート４を打設し、この打設したコンクリート４と鉄筋６により拡径用鋼管３と既設場所打ちコンクリート杭Ｐ２とを接続するようにしたものである。 In FIG. 3, the 2nd Example of the reinforcement construction method of the existing concrete pile of this invention is shown.
This existing concrete pile reinforcement method is the same as the reinforcement method of the existing cast-in-place concrete pile P2 in which the reinforcing bars 6 are arranged, while exposing the reinforcing bar 6 at the head of the existing cast-in-place concrete pile P2 and on the outer periphery of the reinforcing bar 6 A large-diameter steel pipe 3 for expansion is arranged, concrete 4 is placed inside the steel pipe 3 for expansion, and the steel pipe 3 for expansion and the existing cast-in-place concrete pile are placed by the concrete 4 and the reinforcing bars 6 P2 is connected.

具体的には、既設場所打ちコンクリート杭Ｐ２の頭部の鉄筋６を、既設の構造物のフーチングＦを取り壊して露出させ、この鉄筋６に、拡径用鋼管３として径の大きい内面リブ付鋼管をかぶせ、この内面リブ付鋼管の内部にコンクリート４を打設することにより既設場所打ちコンクリート杭Ｐ２の軸部Ｔ１と拡径部Ｔ２を接続している。
なお、図において、５は既設場所打ちコンクリート杭Ｐ２のコンクリート、６は鉄筋（鉄筋かご）を示している。 Specifically, the rebar 6 at the head of the existing cast-in-place concrete pile P2 is exposed by tearing off the footing F of the existing structure, and a steel pipe with an inner rib having a large diameter as the steel pipe 3 for diameter expansion is exposed to the rebar 6 And the shaft portion T1 and the expanded diameter portion T2 of the existing cast-in-place concrete pile P2 are connected by placing concrete 4 inside the steel pipe with the inner surface rib.
In addition, in the figure, 5 has shown the concrete of the existing cast-in-place concrete pile P2, and 6 has shown the reinforcement (rebar cage).

鉄筋６の定着長Ｌは、拡径用鋼管３からコンクリート４を介しての応力伝達により決まるが、一般的には４０ｄ（ｄ：鉄筋径）あれば充分である。
また、この鉄筋６を拡径用鋼管４の上部まで立ち上げて、拡径部Ｔ２を鋼管鉄筋コンクリート構造としてもよい。
また、拡径用鋼管３と既設場所打ちコンクリート杭Ｐ２との直径の差は、拡径用鋼管３から鉄筋６への応力伝達をスムースにするためには３００ｍｍ以下が望ましい。
なお、既設の構造物のフーチングＦの位置の鉄筋６の損傷が激しい場合や鉄筋６の定着長Ｌが充分とれない場合には、既設場所打ちコンクリート杭Ｐ２本体部分を取り壊して必要な長さの鉄筋６を露出させる（損傷が激しい部分は切除する）ようにする。 The fixing length L of the reinforcing bar 6 is determined by the stress transmission from the diameter-expanding steel pipe 3 through the concrete 4, but generally 40d (d: diameter of the reinforcing bar) is sufficient.
Further, the reinforcing bar 6 may be raised up to the upper part of the steel pipe 4 for expanding the diameter, and the enlarged diameter part T2 may have a steel pipe reinforced concrete structure.
In addition, the difference in diameter between the diameter expanding steel pipe 3 and the existing cast-in-place concrete pile P2 is preferably 300 mm or less in order to smoothly transmit the stress from the diameter expanding steel pipe 3 to the reinforcing bar 6.
If the rebar 6 is severely damaged at the position of the footing F of the existing structure, or if the fixing length L of the rebar 6 is not sufficient, the existing cast-in-place concrete pile P2 main body portion is demolished. The rebar 6 is exposed (the part that is severely damaged is excised).

この既設コンクリート杭の補強工法は、既設場所打ちコンクリート杭Ｐ２の頭部の鉄筋６を露出させるとともに、鉄筋６の外周に大径の拡径用鋼管３を配設し、拡径用鋼管３の内部にコンクリート４を打設し、この打設したコンクリート４と鉄筋６により拡径用鋼管３と既設場所打ちコンクリート杭Ｐ２とを接続することができ、これにより、杭の軸部Ｔ１と拡径部Ｔ２との接続を容易にし、既設場所打ちコンクリート杭Ｐ２の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができる。   This existing concrete pile reinforcement method exposes the rebar 6 at the head of the existing cast-in-place concrete pile P2 and disposes a large-diameter steel pipe 3 for expansion on the outer periphery of the steel bar 6. Concrete 4 is cast in the interior, and the expanded steel pipe 3 and the existing cast-in-place concrete pile P2 can be connected by the cast concrete 4 and the reinforcing bar 6, so that the shaft portion T1 of the pile and the expanded diameter can be connected. The connection with the portion T2 can be facilitated, and the head of the existing cast-in-place concrete pile P2 can be expanded to a steel pipe concrete structure having a larger diameter at a low cost.

以上、本発明の既設コンクリート杭の補強工法について、そ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、例えば、上杭全長に亘って鋼管を配設した既設鋼管コンクリート杭（ＳＣ杭等）に適用する等、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。   As mentioned above, although the reinforcement construction method of the existing concrete pile of this invention was demonstrated based on the Example, this invention is not limited to the structure described in the said Example, For example, a steel pipe over the upper pile full length The structure can be changed as appropriate without departing from the spirit of the present invention, such as application to existing steel pipe concrete piles (SC piles, etc.).

本発明の既設コンクリート杭の補強工法は、杭の軸部と拡径部との接続を容易にし、既設鋼管コンクリート杭や既設場所打ちコンクリート杭の頭部をさらに径の大きい鋼管コンクリート構造に低廉に拡径することができるという特性を有していることから、既設場所打ち鋼管コンクリート杭やＳＣ杭、さらには、既設場所打ちコンクリート杭の頭部拡径の用途に用いることができ、例えば、鋼管コンクリート杭を構築した後、上部構造物の設計が変更になり、構築した鋼管コンクリート杭では、水平耐力が不足するような場合や、既設の構造物を取り壊して新しい構造物を構築する際に、既設の構造物の基礎を構築し直すことなくそのまま利用する場合に好適に用いることができる。   The method of reinforcing an existing concrete pile according to the present invention facilitates the connection between the shaft portion and the enlarged diameter portion of the pile, and the head of the existing steel pipe concrete pile or the existing cast-in-place concrete pile is made cheaper to a steel pipe concrete structure having a larger diameter. Since it has the property of being able to expand the diameter, it can be used for the application of the existing cast-in-place steel pipe concrete pile and SC pile, and further to the head diameter expansion of the existing cast-in-place concrete pile. After constructing a concrete pile, the design of the superstructure was changed, and in the constructed steel pipe concrete pile, when the horizontal strength is insufficient, or when constructing a new structure by demolishing an existing structure, It can be suitably used when the existing structure is used as it is without reconstructing the foundation.

本発明の既設コンクリート杭の補強工法による一施工例を示す断面図である。It is sectional drawing which shows one construction example by the reinforcement construction method of the existing concrete pile of this invention. 異径の鋼管同士を接続する方法を示し、（ａ）は円板、（ｂ）はテーパー管、（ｃ）はリブプレートをそれぞれ用いた鋼管コンクリート杭の断面図である。It shows a method of connecting steel pipes of different diameters, (a) is a cross-sectional view of a steel pipe concrete pile using a disk, (b) a tapered pipe, and (c) a rib plate. 本発明の既設コンクリート杭の補強工法による一施工例を示す断面図で、（ａ）は施工前、（ｂ）は施工後を示す。It is sectional drawing which shows one construction example by the reinforcement construction method of the existing concrete pile of this invention, (a) shows before construction, (b) shows after construction.

符号の説明Explanation of symbols

１ 杭頭部の鋼管
２ 鉄筋
３ 拡径用鋼管
４ コンクリート
５ 既設杭のコンクリート
６ 鉄筋かご
Ｐ１ 既設鋼管コンクリート杭
Ｐ２ 既設場所打ちコンクリート杭
Ｔ１ 杭の軸部
Ｔ２ 拡径部
Ｌ 定着長
Ｆ フーチング DESCRIPTION OF SYMBOLS 1 Steel pipe of a pile head 2 Reinforcement 3 Steel pipe for expansion 4 Concrete 5 Concrete of existing pile 6 Reinforcement cage P1 Existing steel pipe concrete pile P2 Existing cast-in-place concrete pile T1 Pile shaft T2 Expanded part L Fixing length F Footing

Claims (2)

少なくとも杭頭部に鋼管を配設した既設鋼管コンクリート杭の補強工法において、杭頭部に配設した鋼管から上方に鉄筋を延設するとともに、該鉄筋の外周に大径の拡径用鋼管を配設し、該拡径用鋼管の内部にコンクリートを打設することを特徴とする既設コンクリート杭の補強工法。   In the reinforcement method for existing steel pipe concrete piles with a steel pipe at least at the pile head, a reinforcing bar is extended upward from the steel pipe arranged at the pile head, and a large-diameter steel pipe for expanding the diameter is provided on the outer periphery of the reinforcing bar. A method for reinforcing an existing concrete pile, wherein the concrete pile is disposed and concrete is placed inside the steel pipe for expanding the diameter. 内部に鉄筋を配した既設場所打ちコンクリート杭の補強工法において、既設場所打ちコンクリート杭の頭部の鉄筋を露出させるとともに、該鉄筋の外周に大径の拡径用鋼管を配設し、該拡径用鋼管の内部にコンクリートを打設することを特徴とする既設コンクリート杭の補強工法。   In the reinforcement method of existing cast-in-place concrete piles with reinforcing bars inside, the reinforcing bars at the head of the existing cast-in-place concrete piles are exposed, and a large-diameter steel pipe for expansion is arranged on the outer periphery of the reinforcing bars. A method for reinforcing an existing concrete pile characterized by placing concrete inside a steel pipe for diameter.
JP2003376671A 2003-11-06 2003-11-06 Reinforcing construction method of existing concrete pile Pending JP2005139703A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104153359A (en) * 2014-07-16 2014-11-19 大连大金马基础建设有限公司 Prestressed concrete sparse-rebar pile
CN109577322A (en) * 2018-04-13 2019-04-05 常熟理工学院 A kind of constructing device for inside soil body existing pile foundation pile extension
CN111927141A (en) * 2020-09-21 2020-11-13 中冶沈勘秦皇岛工程设计研究总院有限公司 Existing reinforced concrete column head structure and manufacturing method thereof
CN114232702A (en) * 2021-12-06 2022-03-25 天津市政工程设计研究总院有限公司 A kind of steel pipe pile joint reinforcement method and reinforcement structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104153359A (en) * 2014-07-16 2014-11-19 大连大金马基础建设有限公司 Prestressed concrete sparse-rebar pile
CN104153359B (en) * 2014-07-16 2017-03-22 大连大金马基础建设有限公司 Construction method of prestressed concrete sparse-rebar pile
CN109577322A (en) * 2018-04-13 2019-04-05 常熟理工学院 A kind of constructing device for inside soil body existing pile foundation pile extension
CN111927141A (en) * 2020-09-21 2020-11-13 中冶沈勘秦皇岛工程设计研究总院有限公司 Existing reinforced concrete column head structure and manufacturing method thereof
CN114232702A (en) * 2021-12-06 2022-03-25 天津市政工程设计研究总院有限公司 A kind of steel pipe pile joint reinforcement method and reinforcement structure

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