JP2014084573A - Pile head joint structure - Google Patents

Pile head joint structure Download PDF

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JP2014084573A
JP2014084573A JP2012231860A JP2012231860A JP2014084573A JP 2014084573 A JP2014084573 A JP 2014084573A JP 2012231860 A JP2012231860 A JP 2012231860A JP 2012231860 A JP2012231860 A JP 2012231860A JP 2014084573 A JP2014084573 A JP 2014084573A
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pile head
steel pipe
pile
joint
cylindrical
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JP6027391B2 (en
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Harukatsu Kadoya
治克 角屋
Toru Watanabe
亨 渡辺
Takaaki Hirayama
貴章 平山
Yuya Suwa
裕哉 諏訪
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Okabe Co Ltd
岡部株式会社
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Abstract

PROBLEM TO BE SOLVED: To provide a pile head joint structure that enables stress transfer between a pile and a footing to be efficiently performed by securing predetermined bond strength without making the weld amount of a joint of a steel pipe and a connection member larger than necessary.SOLUTION: A pile head joint structure, in which a plurality of pile head reinforcement joint members 2 are provided along an outer peripheral surface of a pile head of such a pile 1 using a steel pipe 11 as a steel pipe concrete pile or a steel pipe pile, includes a cylindrical body 21 into which a pile head reinforcement is inserted and supported, and a pair of connection plates 22 and 22, the one-end sides of which are provided in such a state as to sandwich the cylindrical body 21 from both the sides and the other-end sides of which are welded to an outer peripheral surface of the steel pipe 11.

Description

本発明は、鋼管コンクリート杭または鋼管杭等の鋼管を使用した杭の杭頭部の鋼管外周面に沿って複数の杭頭鉄筋接合部材を設けた杭頭接合構造に関する。   The present invention relates to a pile head joint structure in which a plurality of pile head rebar joint members are provided along a steel pipe outer peripheral surface of a pile head of a pile using a steel pipe such as a steel pipe concrete pile or a steel pipe pile.

杭とフーチング(基礎コンクリート)とは、杭頭部に設けた複数本の杭頭鉄筋をフーチング内に定着することで結合される。また、杭に関し、近年、需要が増えつつある鋼管コンクリート杭や鋼管杭は、杭体の耐力が高いことから、他の杭よりも杭頭部に作用する曲げモーメントが大きくなるとともに、各杭頭鉄筋に生じる引張力も大きくなる。   The pile and the footing (foundation concrete) are combined by fixing a plurality of pile head reinforcing bars provided on the pile head in the footing. In addition, with regard to piles, steel pipe concrete piles and steel pipe piles, for which demand has been increasing in recent years, have a higher bending moment acting on the pile heads than other piles because the pile bodies have higher yield strength, and each pile head The tensile force generated in the reinforcing bar also increases.

これら鋼管コンクリート杭などの杭頭接合構造としては、直接、杭頭部の鋼管外周面に杭頭鉄筋を溶接するのが一般的だが、上述したように杭頭鉄筋に生じる引張力が大きいことから、溶接性が懸念される太径の鉄筋や高強度材の鉄筋を採用することが難しい。故に、杭頭部の鋼管外周面に沿って、多数の杭頭鉄筋が設けられることになり、溶接や配筋などの作業性が悪い。   As for the pile head joint structure such as these steel pipe concrete piles, it is common to weld the pile head rebar directly to the steel pipe outer peripheral surface of the pile head. It is difficult to employ large diameter reinforcing bars or high strength steel bars, which are feared for weldability. Therefore, many pile head reinforcing bars will be provided along the steel pipe outer peripheral surface of a pile head, and workability | operativity, such as welding and reinforcement, is bad.

このようなことから、一端側に杭頭鉄筋が接続される接続部材を鋼管外周面に溶着させた杭頭接合構造が数多く開示されている(例えば、特許文献1〜3参照。)。これら杭頭接合構造は、杭頭部の鋼管外周面から離れた位置に杭頭鉄筋を設けるため、杭頭鉄筋に生じる引張力が小さくなり、杭頭鉄筋の本数を減らすことができる。また、鋼管外周面に杭頭鉄筋を直接溶接しなくて済むため、太径や高強度材の杭頭鉄筋を採用し易くなるという効果がある。   For this reason, many pile head joint structures in which a connecting member to which a pile head reinforcing bar is connected to one end side are welded to the outer peripheral surface of a steel pipe have been disclosed (see, for example, Patent Documents 1 to 3). Since these pile head joint structures provide pile head reinforcing bars at positions away from the steel pipe outer peripheral surface of the pile heads, the tensile force generated in the pile head reinforcing bars is reduced, and the number of pile head reinforcing bars can be reduced. Moreover, since it is not necessary to weld a pile head reinforcement directly to a steel pipe outer peripheral surface, there exists an effect that it becomes easy to employ | adopt the pile head reinforcement of a large diameter or a high strength material.

特公平03−054736号公報Japanese Patent Publication No. 03-054736 特開2001−182079号公報JP 2001-182079 A 特開2002−115248号公報JP 2002-115248 A

しかしながら、前記特許文献1〜3に記載の杭頭接合構造では、それぞれ次のような問題点がある。   However, the pile head joint structures described in Patent Documents 1 to 3 have the following problems.

(1)特許文献1に記載の杭頭接合構造の問題点
(i)平板がカプラーの中心(杭頭鉄筋に生じる引張力の中心)線から鋼管(杭)側の周面位置に溶着されているため、杭頭部に曲げモーメントが作用した際、その溶接部には局所的に応力が集中してしまい、その溶接部の破壊が懸念され、より多くの溶接量が必要になる。
(ii)平板が鋼管外周面に溶着される構成であることから、杭頭部に曲げモーメントが作用した際、鋼管自体が面外変形するのを防ぐために平板の高さ(鉛直方向の長さ)を大きくして、溶接長さを長くする必要がある。
(iii)平板が応力を負担する構成であることから、平板自体が面外変形するのを防ぐために平板の板厚を厚くする必要があり、板厚が薄い鋼管に溶接する際に欠陥が生じ易い。また、平板に面外方向のせん断力が作用した際、平板と鋼管との溶接部には曲げなどの力も負荷されるため、より多くの溶接量が必要になる。
(iv)杭頭鉄筋に太径や高強度材を採用した場合、その杭頭鉄筋が備える耐力に対して十分に応力伝達できるだけの接合(溶接)耐力が必要になるため、平板とカプラー、鋼管外周面との溶接長さが長くなり、カプラーの全長や平板の高さを大きくする必要がある。
(1) Problems of the pile head joint structure described in Patent Document 1 (i) The flat plate is welded to the circumferential surface position on the steel pipe (pile) side from the center of the coupler (center of tensile force generated in the pile head rebar). Therefore, when a bending moment is applied to the pile head, stress is locally concentrated on the welded portion, and there is a concern about the destruction of the welded portion, which requires a larger amount of welding.
(Ii) Since the flat plate is welded to the outer peripheral surface of the steel pipe, when the bending moment is applied to the pile head, the height of the flat plate (length in the vertical direction) is used to prevent the steel pipe itself from being deformed out of plane. ) Must be increased to increase the welding length.
(Iii) Since the flat plate bears stress, it is necessary to increase the thickness of the flat plate in order to prevent the flat plate itself from being deformed out of plane, and defects occur when welding to a steel pipe with a thin plate thickness. easy. Further, when a shearing force in the out-of-plane direction acts on the flat plate, the welding portion between the flat plate and the steel pipe is also loaded with a force such as bending, so that a larger amount of welding is required.
(Iv) When a large diameter or high strength material is used for the pile head rebar, the joint (weld) proof strength that can sufficiently transmit stress to the proof strength of the pile head rebar is required. The weld length with the outer peripheral surface becomes longer, and it is necessary to increase the overall length of the coupler and the height of the flat plate.

(2)特許文献2,3に記載の杭頭接合構造の問題点
(i)杭頭部に曲げモーメントが作用した際、杭頭鉄筋に生じる引張力や圧縮力は支圧板やナット(座金)を介して接続部材の上面または下面のみに作用するため、接続部材と鋼管との溶接部には局所的に応力が集中してしまい、その溶接部の破壊が懸念され、その破壊を防止するためにはより多くの溶接量が必要になる。
(ii)接続部材の内部に充填されるコンクリートや固化材と杭頭鉄筋とが接触状態であるため、杭頭鉄筋に引張力が生じた際に、その接触している周囲のコンクリート等に割裂が生じてしまい、接続部材自体の変形や、鋼管との溶接部に悪影響を及ぼす虞がある。つまり、コンクリート等による拘束効果が低減する虞がある。
(2) Problems with the pile head joint structures described in Patent Documents 2 and 3 (i) When a bending moment is applied to the pile head, the tensile and compressive forces generated in the pile head rebar are the bearing plates and nuts (washers). In order to act on only the upper or lower surface of the connecting member via the joint, stress is locally concentrated on the welded portion between the connecting member and the steel pipe, and there is a concern about the destruction of the welded portion, in order to prevent the destruction. Requires more welding.
(Ii) Since the concrete or solidification material filled inside the connecting member is in contact with the pile head reinforcement, when a tensile force is generated in the pile head reinforcement, the surrounding concrete, etc. in contact with it is split. May occur, which may adversely affect the deformation of the connecting member itself and the welded portion with the steel pipe. That is, there is a possibility that the restraining effect by concrete or the like is reduced.

そこで、本発明は、このような問題点に着目してなされたもので、鋼管や接続部材における接合部(溶接部)の溶接量を必要以上に多くすることなく所定の接合強度を確保し、杭とフーチングとの間の応力伝達を効率良く行うことができる杭頭接合構造を提供することを目的とする。   Therefore, the present invention has been made paying attention to such problems, ensuring a predetermined joint strength without increasing the welding amount of the joint portion (welded portion) in the steel pipe or connecting member more than necessary, An object of the present invention is to provide a pile head joint structure capable of efficiently performing stress transmission between a pile and a footing.

上記目的を達成するため、本発明に係る杭頭接合構造は、鋼管コンクリート杭または鋼管杭における杭頭部の鋼管外周面に沿って複数の杭頭鉄筋接合部材を設けた杭頭接合構造であって、杭頭鉄筋接合部材は、杭頭鉄筋が挿入される筒状体と、一端側が筒状体をその両側から挟むような状態で設けられていると共に、他端側が鋼管外周面に溶着された一対の接続板とで構成したことを特徴とする。
ここで、一対の接続板の一端側は、筒状体の長手方向の中心線を超えて延出し、一対の接続板では、それぞれ、その内側面と筒状体の外周面とにより鋼管側および鋼管側とは反対側の2箇所に隅を形成しており、それら全ての隅を溶着すると良い。
また、筒状体は、その内部に杭頭鉄筋の雄ネジ部に螺合する雌ネジ部が形成されていると良い。
In order to achieve the above object, a pile head joint structure according to the present invention is a pile head joint structure in which a plurality of pile head reinforcing bar joint members are provided along the steel pipe outer peripheral surface of a pile head in a steel pipe concrete pile or a steel pipe pile. The pile head rebar joint member is provided with a tubular body into which the pile head rebar is inserted and one end side sandwiching the tubular body from both sides, and the other end side is welded to the outer peripheral surface of the steel pipe. It is characterized by comprising a pair of connecting plates.
Here, one end side of the pair of connection plates extends beyond the center line in the longitudinal direction of the cylindrical body, and in the pair of connection plates, the steel pipe side and the outer peripheral surface of the cylindrical body respectively. Corners are formed at two locations opposite to the steel pipe side, and it is preferable to weld all of these corners.
Moreover, it is good for the cylindrical body to have the internal thread part screwed together in the internal thread part of a pile head reinforcement inside.

本発明に係る杭頭接合構造では、杭頭鉄筋が挿入される筒状体と、一端側が筒状体をその両側から挟むような状態で設けられていると共に、他端側が鋼管外周面に溶着された一対の接続板とで杭頭鉄筋接合部材を構成したため、鋼管や杭頭鉄筋接合部材における接合部(溶接部)の溶接量を必要以上に多くすることなく所定の接合強度を確保できる共に、杭とフーチングとの間で効率良く応力伝達を行うことができる。   In the pile head joint structure according to the present invention, the cylindrical body into which the pile head rebar is inserted and the one end side are provided in such a state that the cylindrical body is sandwiched from both sides, and the other end side is welded to the outer peripheral surface of the steel pipe. Since the pile head rebar joint member is composed of a pair of connected plates, a predetermined joint strength can be ensured without increasing the welding amount of the joint (welded part) in the steel pipe or pile head rebar joint member more than necessary. The stress can be transmitted efficiently between the pile and the footing.

本発明に係る杭頭接合構造の一例を示す正面図である。It is a front view which shows an example of the pile head junction structure which concerns on this invention. その杭頭接合構造の左側面図である。It is a left view of the pile head junction structure. その杭頭接合構造におけるA−A線断面図である。It is an AA line sectional view in the pile head junction structure. その杭頭接合構造の拡大平面図である。It is an enlarged plan view of the pile head joint structure. 他の筒状体を使用した杭頭接合構造の拡大平面図である。It is an enlarged plan view of a pile head joint structure using another cylindrical body. さらに他の筒状体を使用した杭頭接合構造の拡大平面図である。Furthermore, it is an enlarged plan view of the pile head joint structure using another cylindrical body. 接続板の形状の違いによる掘削土量の差を示す正面図である。It is a front view which shows the difference in the amount of excavated soil by the difference in the shape of a connection board. 杭頭接合構造の他の例を示す拡大平面図である。It is an enlarged plan view which shows the other example of a pile head junction structure. 杭頭接合構造のさらに他の例を示す拡大平面図である。It is an enlarged plan view which shows the other example of a pile head junction structure. 杭頭接合構造のさらに他の例を示す拡大平面図である。It is an enlarged plan view which shows the other example of a pile head junction structure.

次に、本発明に係る杭頭接合構造の実施形態について、図面を参照して説明する。
図1〜図3に示すように、この杭頭接合構造は、鋼管コンクリート杭(SC杭)または鋼管杭(S杭)等の鋼管11を使用した杭1における杭頭部の鋼管外周面に沿って60度や90度等の適宜間隔で杭頭鉄筋接合部材2を複数設けたもので、杭頭鉄筋接合部材2に杭頭鉄筋3を挿入して螺合すると共に、ナット41で締め付けて結合するように構成されている。杭頭鉄筋3は、図示しない基礎コンクリートのフーチング内に挿入されて定着することで杭1と基礎コンクリートとを結合するもので、ここでは一例としてネジ節鉄筋(異形棒鋼)を使用している。なお、図1〜図3では、説明の便宜上、杭1の杭頭部に1つの杭頭鉄筋接合部材2のみ図示していないが、実際には、鋼管11の外周面に沿って適宜間隔で複数設けられている。
Next, an embodiment of a pile head joint structure according to the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, this pile head joint structure is along the steel pipe outer peripheral surface of the pile head in the pile 1 using the steel pipe 11 such as a steel pipe concrete pile (SC pile) or a steel pipe pile (S pile). A plurality of pile head rebar joint members 2 are provided at appropriate intervals such as 60 degrees and 90 degrees, and the pile head rebar joint members 2 are inserted into the pile head rebar joint members 2 and screwed together. Is configured to do. The pile head rebar 3 joins the pile 1 and the foundation concrete by being inserted into a footing of foundation concrete (not shown) and fixed, and here, as an example, a threaded reinforcing bar (deformed bar) is used. In FIG. 1 to FIG. 3, for convenience of explanation, only one pile head reinforcing member 2 is not shown in the pile head of the pile 1, but actually, at an appropriate interval along the outer peripheral surface of the steel pipe 11. A plurality are provided.

杭頭鉄筋接合部材2は、筒状体21と、一対の接続板22,22とで構成されている。筒状体21は、杭頭鉄筋3の雄ネジ部31が挿入されるもので、図4等に示すように外周面が六角形である一方、その内周面には、杭頭鉄筋3の雄ネジ部31に螺合する雌ネジ部21aが形成されている。ここで、筒状体21について、このように雌ネジ部21aが内部に形成されたものを用いれば、杭頭部に曲げモーメントが作用した際、杭頭鉄筋3に生じる引張力や圧縮力が、筒状体21を介して一対の接続板22,22の上下方向全長に亘ってそれぞれ作用することになり、接続板22,22と鋼管11との溶接部53には局所的に応力が集中することはないので好適である。なお、後述する雌ネジ部21aが内部に形成されていない筒状体であっても、杭頭鉄筋3に生じる引張力や圧縮力が、接続板22,22の上面または下面のみでなく筒状体にも作用するため、溶接部53に局所的に応力が集中することを抑制できる。   The pile head reinforcing bar joining member 2 includes a cylindrical body 21 and a pair of connection plates 22 and 22. The cylindrical body 21 is inserted with the male thread portion 31 of the pile head rebar 3, and the outer peripheral surface is hexagonal as shown in FIG. 4 and the like, while the inner peripheral surface thereof has the pile head rebar 3 of the pile head rebar 3. A female screw portion 21 a that is screwed into the male screw portion 31 is formed. Here, if the cylindrical body 21 having the female screw portion 21a formed therein is used, when a bending moment is applied to the pile head, a tensile force or a compressive force generated in the pile head rebar 3 is generated. The pair of connecting plates 22, 22 act through the entire length in the vertical direction through the cylindrical body 21, and stress is locally concentrated on the welded portion 53 between the connecting plates 22, 22 and the steel pipe 11. It is suitable because it does not. In addition, even if it is the cylindrical body in which the internal thread part 21a mentioned later is not formed in the inside, the tensile force and compression force which arise in the pile head reinforcement 3 are not only the upper surface or lower surface of the connection plates 22 and 22, but cylindrical. Since it also acts on the body, local concentration of stress on the welded portion 53 can be suppressed.

一対の接続板22,22は、それぞれ、一端側(筒状体21側)が筒状体21をその両側から挟むように溶着されていると共に、他端側(鋼管11側)が鋼管11の外周面に溶着されている。ここで、一対の接続板22,22は、図1や図3に示すように、その正面視の形状を筒状体21から鋼管11に向かうに従って下端部が徐々に下方へ拡幅する形状にすることにより、筒状体21と鋼管11への応力伝達に必要な溶接長を確保している。また、一対の接続板22,22の一端側は、筒状体21の長手方向の中心線21cを超え、少なくとも筒状体21において鋼管11から最遠の外周面、すなわち図4では六角形の筒状体21の最遠角部21b以上、延出させている。つまり、この杭頭鉄筋接合部材2では、図1に示すように正面視した場合に、一対の接続板22,22から筒状体21の最遠角部21bが突出しないように構成されている。   The pair of connection plates 22, 22 are welded so that one end side (tubular body 21 side) sandwiches the cylindrical body 21 from both sides, and the other end side (steel pipe 11 side) is the steel pipe 11. It is welded to the outer peripheral surface. Here, as shown in FIG. 1 and FIG. 3, the pair of connection plates 22, 22 has a shape in which the lower end portion gradually widens downward as it goes from the tubular body 21 to the steel pipe 11. By this, the welding length required for the stress transmission to the cylindrical body 21 and the steel pipe 11 is ensured. Further, one end side of the pair of connection plates 22 and 22 exceeds the center line 21c in the longitudinal direction of the cylindrical body 21, and is at least the outer peripheral surface of the cylindrical body 21 from the steel pipe 11, that is, a hexagonal shape in FIG. The cylindrical body 21 extends beyond the farthest corner 21b. That is, this pile head reinforcing bar joining member 2 is configured such that the farthest-angle portion 21b of the cylindrical body 21 does not protrude from the pair of connection plates 22 and 22 when viewed from the front as shown in FIG. .

そして、一対の接続板22,22と筒状体21との接合は、図4等に示すように、一対の接続板22,22の内側面と六角形の筒状体21の外周面とがそれぞれ形成する鋼管11側の隅(すみ)と、鋼管11側とは反対側の隅(すみ)の2箇所をすみ肉溶接等により溶着する。つまり、筒状体21は、一対の接続板22,22にその両側を挟まれた状態で、かつ、4箇所で溶着されることになる。なお、図上、各2箇所の51,52が一対の接続板22,22と筒状体21との間の溶接部である。   As shown in FIG. 4 and the like, the pair of connection plates 22 and 22 and the cylindrical body 21 are joined by the inner surface of the pair of connection plates 22 and 22 and the outer peripheral surface of the hexagonal cylindrical body 21. Two portions, ie, a corner on the steel pipe 11 side to be formed and a corner (cham) on the side opposite to the steel pipe 11 side are welded by fillet welding or the like. That is, the cylindrical body 21 is welded at four locations in a state where both sides thereof are sandwiched between the pair of connection plates 22 and 22. In the figure, 51 and 52 at two locations are welds between the pair of connection plates 22 and 22 and the cylindrical body 21.

そのため、この杭頭鉄筋接合部材2を使用した実施形態の杭頭接合構造によれば、2枚の接続板22,22を使用して筒状体21を鋼管11に接合しているので、杭頭鉄筋に結合されるカプラーを1枚の平板で鋼管に溶接する特許文献1の従来技術に比べて、杭頭鉄筋3を介し基礎コンクリートから鋼管11へ応力が伝達される際、鋼管11を面外へ曲げる力が2枚の接続板22,22に分散されることになり、平板の高さを大きくすることなく耐力・剛性ともに強固な接合部を形成できることになる。   Therefore, according to the pile head joining structure of the embodiment using this pile head rebar joining member 2, the cylindrical body 21 is joined to the steel pipe 11 using the two connection plates 22, 22. Compared with the prior art of Patent Document 1 in which a coupler coupled to the head reinforcing bar is welded to the steel pipe with a single flat plate, when the stress is transmitted from the foundation concrete to the steel pipe 11 via the pile head reinforcing bar 3, the steel pipe 11 is faced. The outward bending force is distributed to the two connection plates 22, 22, so that a strong joint with both strength and rigidity can be formed without increasing the height of the flat plate.

また、この杭頭鉄筋接合部材2では、一対の接続板22,22が平行に取り付けられているので、施工時に杭1に対して一対の接続板22,22を垂直に取り付けることが容易になるという効果も得られる。また、1枚の平板とカプラーを溶接する特許文献1の従来技術に比べて、この杭頭鉄筋接合部材2では、2枚の接続板22,22と筒状体21とを使用するので、接続板22,22の板厚を薄くすることができ、溶接施工が容易で品質の良い溶接部を確保できると共に、特許文献2に開示されたU字状プレートのように折曲げ成形によって生じる有害な塑性化部分がこの杭頭鉄筋接合部材2には設けられない。また、図4等に示すように、筒状体21の外側面は六角であるため、一対の接続板22,22の内側面との間の隅(すみ)に自然に開先が形成され、溶接作業が容易になると共に、品質の良い杭頭鉄筋接合部材2を製造できる。   Moreover, in this pile head reinforcement joining member 2, since a pair of connection plates 22 and 22 are attached in parallel, it becomes easy to attach a pair of connection plates 22 and 22 perpendicularly with respect to the pile 1 at the time of construction. The effect is also obtained. Moreover, compared with the prior art of patent document 1 which welds one flat plate and a coupler, since this pile head reinforcement joining member 2 uses the two connection plates 22 and 22 and the cylindrical body 21, it is connected. It is possible to reduce the plate thickness of the plates 22 and 22, and to secure a welded portion that is easy to weld and of good quality, and is harmful due to bending as in the U-shaped plate disclosed in Patent Document 2. A plasticized portion is not provided in the pile head reinforcing bar joining member 2. Moreover, as shown in FIG. 4 etc., since the outer side surface of the cylindrical body 21 is a hexagon, a groove | channel is naturally formed in the corner (cham) between the inner side surfaces of a pair of connection plates 22 and 22, While welding work becomes easy, the quality pile head reinforcement joining member 2 can be manufactured.

また、一対の接続板22,22と筒状体21とは、図4等に示すように、それぞれ、2箇所の溶接部51,52で溶着され、合計4箇所で溶着されることになるので、1枚の平板とカプラーを溶接する特許文献1の従来技術に比べてより多くの溶接長が得られる。そのため、鋼管11に対する溶接長を確保しつつ、筒状体21およびそれに溶着される部分の接続板22,22の上下方向の長さを短くすることができる。   Further, as shown in FIG. 4 and the like, the pair of connection plates 22 and 22 and the cylindrical body 21 are welded at two welded portions 51 and 52, respectively, and are welded at a total of four locations. More welding lengths can be obtained as compared with the prior art of Patent Document 1 in which one flat plate and a coupler are welded. Therefore, it is possible to shorten the length in the vertical direction of the tubular body 21 and the connection plates 22 and 22 of the portion welded thereto while securing the weld length to the steel pipe 11.

さらに、この杭頭鉄筋接合部材2では、基礎コンクリートの打設時には、図4等に示すように一対の接続板22,22と杭1との間の空間(空隙)23にコンクリートが詰まることになる。そのため、一対の接続板22,22に応力が伝達された場合には、一対の接続板22,22がその空間23内に充填されたコンクリートを拘束した状態で一体的に抵抗するので、杭頭鉄筋接合部材2や鋼管11が面外に変形し難くなる。また、一対の接続板22,22と鋼管11の間の空間23に充填されたコンクリートは、筒状体21によって定着体である杭頭鉄筋3とは直接接しないため、杭頭鉄筋3に引張力が生じたとしても割裂が生じることはなく、コンクリートによる拘束効果が低減するような虞がない。   Furthermore, in this pile head reinforcement joining member 2, when foundation concrete is laid, the concrete is clogged in the space (gap) 23 between the pair of connection plates 22 and 22 and the pile 1 as shown in FIG. Become. Therefore, when stress is transmitted to the pair of connection plates 22 and 22, the pair of connection plates 22 and 22 integrally resist in a state in which the concrete filled in the space 23 is constrained. The reinforcing bar joining member 2 and the steel pipe 11 are not easily deformed out of plane. In addition, the concrete filled in the space 23 between the pair of connection plates 22 and 22 and the steel pipe 11 is not directly in contact with the pile head rebar 3 that is a fixing body by the tubular body 21, and therefore is pulled to the pile head rebar 3. Even if force is generated, splitting does not occur, and there is no fear that the constraining effect by concrete is reduced.

また、この杭頭鉄筋接合部材2では、一対の接続板22,22と六角形の筒状体21との間が4箇所で溶着されるだけでなく、各接続板22,22それぞれにおける2箇所の溶接部51,52は、図4に示すように、筒状体21の長手方向の中心線21cを通り、各接続板22,22に対し垂直な平面に対し、線対称の位置に設けられる。そのため、杭頭鉄筋11および筒状体21に作用する引張力に対し、その中心線21cを挟んだ各接続板22,22における2箇所の溶接部51,52がそれぞれ反力として作用することになる。即ち、中心線21cから鋼管側の周面位置に溶着される溶接部52,52だけでなく、それら位置とは線対称の位置にある鋼管側とは反対側の溶接部51,51も反力として作用することから、杭頭部に曲げモーメントが作用しても、溶接部52,52に局所的に応力が集中することはなく、期待する溶接耐力を十分に発揮できる。   Moreover, in this pile head rebar joining member 2, not only four places are welded between a pair of connection plates 22 and 22 and the hexagonal cylindrical body 21, but two locations in each of the connection plates 22 and 22, respectively. As shown in FIG. 4, the welded portions 51 and 52 are provided at positions symmetrical with respect to a plane perpendicular to the connection plates 22 and 22 through the center line 21 c in the longitudinal direction of the cylindrical body 21. . Therefore, with respect to the tensile force acting on the pile head rebar 11 and the tubular body 21, the two welded portions 51 and 52 in each of the connection plates 22 and 22 sandwiching the center line 21c act as reaction forces, respectively. Become. That is, not only the welded portions 52 and 52 welded from the center line 21c to the circumferential surface position on the steel pipe side, but also the welded portions 51 and 51 on the opposite side of the steel pipe side that are in a line-symmetrical position with respect to those positions. Therefore, even if a bending moment acts on the pile head, stress is not locally concentrated on the welded parts 52, 52, and the expected welding strength can be sufficiently exhibited.

また、一対の接続板22,22それぞれの他端側は、図4等に示すように開先加工されており、鋼管11の外周面との間で形成される外側の隅(すみ)を溶込み溶接により溶接して、溶接部53を形成している。なお、鋼管11の外周面は湾曲しているので、接続板22,22の他端側の開先加工は省略しても良い。また、一対の接続板22,22それぞれにおいて、鋼管11の外周面との間で形成される外側の隅(すみ)と内側の隅(すみ)の2箇所を、すみ肉溶接等により溶接しても良い。   Further, the other end side of each of the pair of connection plates 22 and 22 is grooved as shown in FIG. 4 and the like, and melts an outer corner formed with the outer peripheral surface of the steel pipe 11. The welded portion 53 is formed by welding by lap welding. In addition, since the outer peripheral surface of the steel pipe 11 is curved, the groove processing on the other end side of the connection plates 22 and 22 may be omitted. Further, in each of the pair of connection plates 22 and 22, two outer corners (filled corners) and inner corners (filled corners) formed between the outer peripheral surfaces of the steel pipe 11 are welded by fillet welding or the like. Also good.

なお、上記の説明では、筒状体21は、図1〜図4に示すように、外周面が六角形で、その内周面に雌ネジ部21aが形成されているものとして説明したが、本発明では、これに限らず、図5に示すように、外周面が円形で、その内周面には雌ネジ部21a’が形成された筒状体21’でも良いし、図6に示すように、外周面が円形もしくは図1〜図4に示す筒状体21のように六角形等の多角形で、その内周面には雌ネジ部が形成されてない筒状体21”でも良い。ただし、図6に示す筒状体21”の場合、内周面に雌ネジ部が形成されてないため、杭頭鉄筋3を連結する場合には、図7に示すように、筒状体21”の上下でナット41,42により締め付ける必要がある。そのため、図7で右側に示す正面視で方形の接続板22’よりも、図7で左側に示す正面視で下端部が筒状体21”から鋼管11に向かうに従って下端部が徐々に下方へ拡幅する接続板22の方が、接続板22と鋼管11との溶接長を確保しつつも、下側のナット42の取り付け作業スペースを確保することができる。その結果、杭頭部における掘削土量を減らすことができ、さらに作業性が向上する。なお、図7では、杭頭鉄筋として、外周面が竹節状の異形鉄筋の杭頭鉄筋3’を使用している。   In the above description, the cylindrical body 21 is described as having a hexagonal outer peripheral surface and a female screw portion 21a formed on the inner peripheral surface thereof as shown in FIGS. In the present invention, not limited to this, as shown in FIG. 5, a cylindrical body 21 ′ having a circular outer peripheral surface and a female screw portion 21 a ′ formed on the inner peripheral surface thereof may be used, as shown in FIG. 6. As described above, the outer peripheral surface is a circular shape or a polygonal shape such as a hexagon like the cylindrical body 21 shown in FIGS. 1 to 4, and the inner peripheral surface of the cylindrical body 21 ″ not formed with a female thread portion. However, in the case of the cylindrical body 21 ″ shown in FIG. 6, since the internal thread portion is not formed on the inner peripheral surface, when connecting the pile head reinforcing bars 3, as shown in FIG. It is necessary to tighten with the nuts 41 and 42 above and below the body 21 ". Therefore, than the rectangular connecting plate 22 'in the front view shown on the right side in FIG. In the front view shown on the left side in FIG. 7, the connecting plate 22 whose lower end portion gradually widens downward as the lower end portion moves from the tubular body 21 ″ to the steel pipe 11 has a longer welding length between the connecting plate 22 and the steel pipe 11. While securing, it is possible to secure an installation work space for the lower nut 42. As a result, the amount of excavated soil at the pile head can be reduced, and workability is further improved. In FIG. 7, a pile head reinforcing bar 3 ′ having a deformed reinforcing bar with an outer peripheral surface is used as the pile head reinforcing bar.

また、図8に示すように、一対の接続板22,22と鋼管11との間の接合部分にそれぞれ裏当て金24,24を設けて溶込み溶接等を行っても良い。裏当て金24,24を使用して溶込み溶接等を行うことにより、溶接品質の良い杭頭鉄筋接合部材2を製造できる。また、図8に示すように一対の接続板22,22それぞれと裏当て金24,24とをすみ肉溶接してさらに溶接部54,54を設けても良い。なお、この場合、筒状体は、図8に示す筒状体21”に限らず、図1〜図4に示す筒状体21や図5に示す筒状体21’も使用でき、このことは後述する図9および図10でも同様である。   Moreover, as shown in FIG. 8, you may perform penetration welding etc. by providing the backing metal 24 and 24 in the junction part between a pair of connection plates 22 and 22 and the steel pipe 11, respectively. By performing penetration welding using the backing metal 24, 24, it is possible to manufacture the pile head rebar joint member 2 having good welding quality. In addition, as shown in FIG. 8, a pair of connection plates 22 and 22 and backing metal 24 and 24 may be fillet welded and further welded portions 54 and 54 may be provided. In this case, the cylindrical body is not limited to the cylindrical body 21 ″ shown in FIG. 8, but the cylindrical body 21 shown in FIGS. 1 to 4 and the cylindrical body 21 ′ shown in FIG. 5 can also be used. The same applies to FIGS. 9 and 10 described later.

また、本発明では、図1〜図8に示すように接続板22,22’の一端部は、筒状体21,21’,21”の最遠端まで延出する必要はなく、接続板22,22’が筒状体21,21’,21”を両側から挟んだ状態で接合または一体成形できれば十分であるため、例えば、図9に示すように筒状体21”の中心線21c”付近まで延出していれば良い。   Moreover, in this invention, as shown in FIGS. 1-8, it is not necessary for the one end part of connection board 22,22 'to extend to the farthest end of cylindrical body 21,21', 21 '', and a connection board For example, as shown in FIG. 9, the center line 21c ″ of the cylindrical body 21 ″ is sufficient because it is sufficient that the 22 and 22 ′ can be joined or integrally formed with the cylindrical bodies 21, 21 ′ and 21 ″ sandwiched from both sides. It only has to extend to the vicinity.

また、図1〜図9に示すように平板状の接続板22,22’ではなく、図10に示すように、湾曲した一対の接続板22”,22”を使用することもできる。湾曲した一対の接続板22”,22”を使用することで、接続板22”,22”の他端側と鋼管11の外周面との間に自然に開先が形成されるため、開先加工の手間を省略でき、作業性が向上する。また、鋼管11に対する一対の接続板22” ,22”の他端部の溶接間距離が大きくなるので、この点でも、鋼管11の面外変形に対する抵抗が増大する。   Further, instead of the flat connection plates 22 and 22 ′ as shown in FIGS. 1 to 9, a pair of curved connection plates 22 ″ and 22 ″ can be used as shown in FIG. 10. By using a pair of curved connection plates 22 ″ and 22 ″, a groove is naturally formed between the other end side of the connection plates 22 ″ and 22 ″ and the outer peripheral surface of the steel pipe 11. Processing time can be saved and workability is improved. Further, since the distance between the welds of the other end portions of the pair of connection plates 22 ″ and 22 ″ with respect to the steel pipe 11 is increased, the resistance to the out-of-plane deformation of the steel pipe 11 is increased also in this respect.

1…杭、11…鋼管、2,2’…杭頭鉄筋接合部材、21,21’,21”…筒状体、21a,21a’…雌ネジ部、22,22’,22”…接続板、3,3’…杭頭鉄筋、31…雄ネジ部、51,52,53,54…溶接部。   DESCRIPTION OF SYMBOLS 1 ... Pile, 11 ... Steel pipe, 2, 2 '... Pile head reinforcement member 21, 21, 21', 21 "... Cylindrical body, 21a, 21a '... Female thread part, 22, 22', 22" ... Connection board 3, 3 '... Pile head rebar, 31 ... Male thread part, 51, 52, 53, 54 ... Welded part.

Claims (3)

鋼管コンクリート杭または鋼管杭における杭頭部の鋼管外周面に沿って複数の杭頭鉄筋接合部材を設けた杭頭接合構造であって、
杭頭鉄筋接合部材は、杭頭鉄筋が挿入される筒状体と、一端側が筒状体をその両側から挟むような状態で設けられていると共に、他端側が鋼管外周面に溶着された一対の接続板とで構成したことを特徴とする杭頭接合構造。
A pile head joint structure in which a plurality of pile head rebar joint members are provided along the steel pipe outer peripheral surface of the pile head in a steel pipe concrete pile or a steel pipe pile,
The pile head rebar joint member is a pair of a tubular body into which the pile head rebar is inserted and one end side is provided in such a state that the tubular body is sandwiched from both sides, and the other end side is welded to the outer peripheral surface of the steel pipe. A pile head joint structure characterized by comprising a connecting plate.
請求項1記載の杭頭接合構造において、
一対の接続板の一端側は、筒状体の長手方向の中心線を超えて延出し、一対の接続板では、それぞれ、その内側面と筒状体の外周面とにより鋼管側および鋼管側とは反対側の2箇所に隅を形成しており、それら全ての隅を溶着することを特徴とする杭頭接合構造。
In the pile head joint structure according to claim 1,
One end side of the pair of connection plates extends beyond the center line in the longitudinal direction of the cylindrical body. In the pair of connection plates, the steel pipe side and the steel pipe side are respectively defined by the inner side surface and the outer peripheral surface of the cylindrical body. Is a pile head joint structure characterized in that corners are formed at two locations on the opposite side and all the corners are welded.
請求項1または請求項2記載の杭頭接合構造において、
筒状体は、その内部に杭頭鉄筋の雄ネジ部に螺合する雌ネジ部が形成されていることを特徴とする杭頭接合構造。
In the pile head joint structure according to claim 1 or claim 2,
The tubular body has a pile head joint structure in which a female screw portion that is screwed into a male screw portion of the pile head reinforcing bar is formed therein.
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016079593A (en) * 2014-10-11 2016-05-16 株式会社クラウン Pile head reinforcement member with bearing pressure resisting metal fitting, and pile head connection structure using pile head reinforcement member with bearing pressure resisting metal fitting
JP2016089539A (en) * 2014-11-07 2016-05-23 岡部株式会社 Pile-head joint structure for steel pipe-reinforced concrete pile
JP2017172310A (en) * 2016-03-22 2017-09-28 株式会社B&B技術事務所 Anchor reinforcement connection metal fitting
JP2017197917A (en) * 2016-04-25 2017-11-02 学校法人福岡大学 Pile head connection member, and pile head connection structure using the same

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62153418A (en) * 1985-12-26 1987-07-08 Noguchi Kenchiku Jimusho:Kk Pile with connector for reinforcing bar
JP2003049437A (en) * 2001-08-03 2003-02-21 Okabe Co Ltd Metal fitting for welding reinforcement installation coupler to steel pipe pile
JP2011106240A (en) * 2009-11-20 2011-06-02 Okabe Co Ltd Pile head joint structure

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62153418A (en) * 1985-12-26 1987-07-08 Noguchi Kenchiku Jimusho:Kk Pile with connector for reinforcing bar
JP2003049437A (en) * 2001-08-03 2003-02-21 Okabe Co Ltd Metal fitting for welding reinforcement installation coupler to steel pipe pile
JP2011106240A (en) * 2009-11-20 2011-06-02 Okabe Co Ltd Pile head joint structure

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2016079593A (en) * 2014-10-11 2016-05-16 株式会社クラウン Pile head reinforcement member with bearing pressure resisting metal fitting, and pile head connection structure using pile head reinforcement member with bearing pressure resisting metal fitting
JP2016089539A (en) * 2014-11-07 2016-05-23 岡部株式会社 Pile-head joint structure for steel pipe-reinforced concrete pile
JP2017172310A (en) * 2016-03-22 2017-09-28 株式会社B&B技術事務所 Anchor reinforcement connection metal fitting
JP2017197917A (en) * 2016-04-25 2017-11-02 学校法人福岡大学 Pile head connection member, and pile head connection structure using the same

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