JP6780063B2 - Pile head reinforcement structure - Google Patents

Pile head reinforcement structure Download PDF

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JP6780063B2
JP6780063B2 JP2019106778A JP2019106778A JP6780063B2 JP 6780063 B2 JP6780063 B2 JP 6780063B2 JP 2019106778 A JP2019106778 A JP 2019106778A JP 2019106778 A JP2019106778 A JP 2019106778A JP 6780063 B2 JP6780063 B2 JP 6780063B2
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pile head
plate
shaped portion
pile
reinforcing member
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JP2019143475A (en
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横山　眞一
眞一 横山
平山　貴章
貴章 平山
内海　祥人
祥人 内海
隆祐 竹内
隆祐 竹内
照久 田中
照久 田中
純一 堺
純一 堺
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Fukuoka University
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本発明は、応力伝達作用及び定着力を十分に確保することが可能であって、基礎中に埋設される配筋と干渉が生じるおそれを低減できると共に、杭頭部に対して応力伝達可能に設ける作業を容易化することが可能で、構造強度を適切に確保できる杭頭補強構造に関する。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to sufficiently secure a stress transmission action and a fixing force, reduce the possibility of interference with the reinforcement arrangement buried in the foundation, and enable stress transmission to the pile head. The present invention relates to a pile head reinforcement structure that can facilitate the work of installation and can appropriately secure the structural strength.

杭と基礎との間で杭頭部に作用する力を伝達するために、基礎中に上部側が埋設されると共に、下部側が杭頭部と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造として、特許文献１が知られている。 In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is buried in the foundation, and the lower side is provided with the pile head so that stress can be transmitted. Patent Document 1 is known as a reinforcing structure.

特許文献１の「既製杭と基礎スラブとの接続方法」は、少ない鉄筋使用量で既製杭と基礎スラブとを強固に接続する方法を提供することを課題とし、既製杭の外径より大径で、内側にガイドが設けられ且つ外側に鉄筋が溶着された金属短管を既製杭の杭頭部分に装着した後、金属短管と既製杭との隙間に基礎スラブを形成するためのコンクリートを充填し杭頭部を補強するとともに、既製杭と形成された基礎スラブとを一体化させるようにしている。 The "method of connecting a ready-made pile and a foundation slab" of Patent Document 1 has an object of providing a method of firmly connecting a ready-made pile and a foundation slab with a small amount of reinforcing bars, and has a diameter larger than the outer diameter of the ready-made pile. Then, after mounting a metal short pipe with a guide on the inside and welded reinforcing bars on the outside to the pile head of the ready-made pile, concrete for forming a foundation slab in the gap between the metal short pipe and the ready-made pile is installed. The pile head is filled and reinforced, and the ready-made pile and the formed foundation slab are integrated.

特開平１０−２６６２２７号公報Japanese Unexamined Patent Publication No. 10-266227

特許文献１では、一般に断面が円形状の鉄筋を短管に溶着するようにしている。基礎と杭との間で杭頭部に作用する曲げモーメントや軸力を伝達するために鉄筋を用いる場合、十分な応力伝達作用を確保し、かつ確実に鉄筋を定着させるためには、鉄筋の長さとして、当該鉄筋の径の３０〜４０倍の長さが必要であり、鉄筋と基礎中に埋設される配筋との干渉が生じてしまう。 In Patent Document 1, a reinforcing bar having a circular cross section is generally welded to a short pipe. When a reinforcing bar is used to transmit the bending moment and axial force acting on the pile head between the foundation and the pile, in order to secure a sufficient stress transmission action and to securely fix the reinforcing bar, the reinforcing bar must be used. The length needs to be 30 to 40 times the diameter of the reinforcing bar, and interference between the reinforcing bar and the reinforcing bar embedded in the foundation occurs.

また、鉄筋としては、良好な定着を確保するために、凹凸のある異形鉄筋などが用いられ、フレア溶接によって接合を行うため、溶接技術が至難であり、溶接欠陥を生じやすかった。 Further, as the reinforcing bar, a deformed reinforcing bar having irregularities or the like is used in order to secure good fixing, and since joining is performed by flare welding, the welding technique is extremely difficult and welding defects are likely to occur.

このような課題は、鉄筋を短管に接合する場合に限らず、杭頭部に直接接合する場合であっても、同様であった。 Such a problem was not limited to the case of joining the reinforcing bar to the short pipe, but was the same even when the reinforcing bar was directly joined to the pile head.

本発明は上記従来の課題に鑑みて創案されたものであって、応力伝達作用及び定着力を十分に確保することが可能であって、基礎中に埋設される配筋と干渉が生じるおそれを低減できると共に、杭頭部に対して応力伝達可能に設ける作業を容易化することが可能で、構造強度を適切に確保できる杭頭補強構造を提供することを目的とする。 The present invention has been devised in view of the above-mentioned conventional problems, and it is possible to sufficiently secure a stress transmitting action and a fixing force, and there is a possibility that interference may occur with the reinforcing bars buried in the foundation. It is an object of the present invention to provide a pile head reinforcing structure which can reduce the amount of stress, facilitate the work of providing stress transmission to the pile head, and can appropriately secure the structural strength.

本発明にかかる杭頭補強構造は、杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、上記杭頭補強部材は、上記杭頭部に接合され、上記鋼製部分との間で応力伝達する上下方向縦向き板状部分と、該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備え、前記杭頭補強部材の前記上下方向縦向き板状部分は、前記鋼製部分に面する接合周面部を有して、該接合周面部が該鋼製部分に溶接接合される鋼製中空筒体で形成されることを特徴とする。 In the pile head reinforcement structure according to the present invention, in order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation and the lower side is made of steel of the pile head. A pile head reinforcing structure having a portion and a pile head reinforcing member provided so as to be able to transmit stress. The pile head reinforcing member is joined to the pile head and transmits stress to and from the steel portion in the vertical direction. The pile head reinforcing member is provided with a vertical plate-shaped portion, a through hole that horizontally penetrates the vertical vertical plate-shaped portion, and a protruding portion projecting from the surface of the vertical vertical plate-shaped portion. The vertical plate-shaped portion in the vertical direction has a joint peripheral surface portion facing the steel portion, and the joint peripheral surface portion is formed of a steel hollow cylinder to be welded to the steel portion. It is characterized by.

本発明にかかる杭頭補強構造は、杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、上記杭頭補強部材は、上記杭頭部に接合され、上記鋼製部分との間で応力伝達する上下方向縦向き板状部分と、該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備え、前記杭頭補強部材の前記上下方向縦向き板状部分は、前記杭頭部を、間隔を隔てて包囲する鋼製中空筒体と、該杭頭部から隙間を隔てて、該鋼製中空筒体の内周面に接合して設けられる鋼製板とから構成され、上記上下方向縦向き板状部分は、上記中空筒体内部に充填される充填材を介して、上記杭頭部に接合されることを特徴とする。 In the pile head reinforcement structure according to the present invention, in order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation and the lower side is made of steel of the pile head. A pile head reinforcing structure having a portion and a pile head reinforcing member provided so as to be able to transmit stress. The pile head reinforcing member is joined to the pile head and transmits stress to and from the steel portion in the vertical direction. The pile head reinforcing member is provided with a vertical plate-shaped portion, a through hole that horizontally penetrates the vertical vertical plate-shaped portion, and a protruding portion projecting from the surface of the vertical vertical plate-shaped portion. The vertically oriented plate-shaped portion in the vertical direction includes a hollow cylinder made of steel that surrounds the pile head at intervals and an inner peripheral surface of the hollow cylinder made of steel with a gap from the pile head. It is characterized in that the vertically oriented plate-shaped portion in the vertical direction is joined to the pile head via a filler filled inside the hollow cylinder. And.

前記突出部は、前記貫通孔をその周りから包囲する形態で形成されることを特徴とする。 The protruding portion is characterized in that it is formed so as to surround the through hole from the periphery thereof.

本発明にかかる杭頭補強構造は、杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、前記杭頭補強部材は、前記杭頭部の直上を横向き方向に跨ぐ横向き板状部分を備え、該横向き板状部分は、上記杭頭部を挟んで当該杭頭部の両側に配置される上下方向縦向き板状部分を連結し、上記杭頭補強部材は、上記杭頭部の前記鋼製部分との間で応力伝達するために、少なくとも該上下方向縦向き板状部分及び上記横向き板状部分のいずれかが該杭頭部に接合されると共に、該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備えることを特徴とする。
In the pile head reinforcement structure according to the present invention, in order to transmit the force acting on the pile head between the pile and the foundation, the upper side is embedded in the foundation and the lower side is made of steel of the pile head. It is a pile head reinforcing structure having a portion and a pile head reinforcing member provided so as to be able to transmit stress, and the pile head reinforcing member includes a lateral plate-like portion straddling directly above the pile head in the lateral direction, and the lateral plate. The shaped portion connects the vertically oriented plate-shaped portions arranged on both sides of the pile head with the pile head interposed therebetween, and the pile head reinforcing member is connected to the steel portion of the pile head. In order to transmit stress between the piles, at least one of the vertical vertical plate-shaped portion and the horizontal plate-shaped portion is joined to the pile head and penetrates the vertical vertical plate-shaped portion in the horizontal direction. It is characterized by including a through hole and a protruding portion projecting from the surface of the vertically oriented plate-shaped portion in the vertical direction.

前記突出部は、前記貫通孔をその周りから包囲する形態で形成されることを特徴とする。 The protruding portion is characterized in that it is formed so as to surround the through hole from the periphery thereof.

前記横向き板状部分を横向きに貫通する貫通孔と、該横向き板状部分の表面から突設される突出部とを備えることを特徴とする。 It is characterized by including a through hole that laterally penetrates the lateral plate-shaped portion and a protruding portion that protrudes from the surface of the lateral plate-shaped portion.

前記杭頭部には、その周方向に沿って環状の鋼製鍔部が形成され、該鍔部に前記杭頭補強部材が接合されることを特徴とする。 An annular steel flange portion is formed on the pile head along the circumferential direction, and the pile head reinforcing member is joined to the flange portion.

前記杭頭部は中空筒状に形成され、前記横向き板状部分は、基礎を構築するコンクリートを堰き止めるための堰部材を備えることを特徴とする。 The pile head is formed in a hollow tubular shape, and the lateral plate-shaped portion is provided with a weir member for damming the concrete forming the foundation.

前記杭頭部は中空筒状に形成され、前記横向き板状部分は、上記杭頭部の内方に垂下される垂下部分を備え、該垂下部分の下端には、杭頭部の内方を上下に仕切る仕切り部材が備えられ、さらに、上記垂下部分を横向きに貫通する貫通孔と、該垂下部分の表面から突設される突出部とを備えることを特徴とする。 The pile head is formed in a hollow tubular shape, the lateral plate-shaped portion is provided with a hanging portion that hangs inward of the pile head, and the inside of the pile head is provided at the lower end of the hanging portion. A partition member for partitioning the upper and lower parts is provided, and further, a through hole for laterally penetrating the hanging portion and a protruding portion protruding from the surface of the hanging portion are provided.

本発明にかかる杭頭補強構造にあっては、応力伝達作用及び定着力を十分に確保することができ、基礎中に埋設される配筋と干渉が生じるおそれを低減できると共に、杭頭部に対して応力伝達可能に設ける作業を容易化することができ、構造強度を適切に確保することができる。 In the pile head reinforcing structure according to the present invention, the stress transmission action and the fixing force can be sufficiently secured, the possibility of interference with the reinforcing bars buried in the foundation can be reduced, and the pile head can be covered. On the other hand, the work of providing stress transferability can be facilitated, and the structural strength can be appropriately secured.

本発明に係る杭頭補強構造の第１実施形態を示す側面図である。It is a side view which shows the 1st Embodiment of the pile head reinforcement structure which concerns on this invention. 図１に示した杭頭補強構造に備えられる貫通孔及び突出部を説明する説明図である。It is explanatory drawing explaining the through hole and the protrusion provided in the pile head reinforcement structure shown in FIG. 図１に示した杭頭補強構造への配筋の適用を説明する斜視図である。It is a perspective view explaining the application of the bar arrangement to the pile head reinforcement structure shown in FIG. 第１実施形態に係る杭頭補強構造の変形例を示す斜視図である。It is a perspective view which shows the modification of the pile head reinforcement structure which concerns on 1st Embodiment. 本発明に係る杭頭補強構造の第２実施形態を示す側面図である。It is a side view which shows the 2nd Embodiment of the pile head reinforcement structure which concerns on this invention. 図５に示した杭頭補強構造の斜視図である。It is a perspective view of the pile head reinforcement structure shown in FIG. 第２実施形態に係る杭頭補強構造の変形例を示す側断面図である。It is a side sectional view which shows the modification of the pile head reinforcement structure which concerns on 2nd Embodiment. 本発明に係る杭頭補強構造の第３実施形態を示す斜視図である。It is a perspective view which shows the 3rd Embodiment of the pile head reinforcement structure which concerns on this invention. 本発明に係る杭頭補強構造の第４実施形態を示す斜視図である。It is a perspective view which shows the 4th Embodiment of the pile head reinforcement structure which concerns on this invention. 図９に示した杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure shown in FIG. 図９に示した杭頭補強構造に用いられる部品を説明する説明図である。It is explanatory drawing explaining the part used for the pile head reinforcement structure shown in FIG. 第４実施形態の第１変形例に係る杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure which concerns on 1st modification of 4th Embodiment. 第４実施形態の第２変形例に係る杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 2nd modification of 4th Embodiment. 図１３に示した杭頭補強構造に用いられる部品を説明する説明図である。It is explanatory drawing explaining the part used for the pile head reinforcement structure shown in FIG. 第４実施形態の第３変形例に係る杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure which concerns on 3rd modification of 4th Embodiment. 図１５に示した杭頭補強構造に用いられる部品の一部である杭頭補強部材の平面視及び側面視をそれぞれ示す説明図である。It is explanatory drawing which shows the plan view and the side view of the pile head reinforcement member which is a part of the part used for the pile head reinforcement structure shown in FIG. 第４実施形態の第４変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。It is explanatory drawing which shows the plan view and the side view of the assembled state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on 4th modification of 4th Embodiment, respectively. 第４実施形態の第５変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。It is explanatory drawing which shows the plan view and the side view of the assembled state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on 5th modification of 4th Embodiment, respectively. 本発明に係る杭頭補強構造の第５実施形態を示す斜視図である。It is a perspective view which shows the 5th Embodiment of the pile head reinforcement structure which concerns on this invention. 図１９に示した杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure shown in FIG. 図１９に示した杭頭補強構造に用いられる部品を説明する説明図である。It is explanatory drawing explaining the part used for the pile head reinforcement structure shown in FIG. 第５実施形態の第１変形例に係る杭頭補強構造を説明する説明図である。It is explanatory drawing explaining the pile head reinforcement structure which concerns on 1st modification of 5th Embodiment. 図２２に示した杭頭補強構造に用いられる部品の一部である杭頭補強部材の構成部品例を説明する説明図である。It is explanatory drawing explaining the example of the component part of the pile head reinforcement member which is a part of the part used for the pile head reinforcement structure shown in FIG. 第５実施形態の第２変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。It is explanatory drawing which shows the plan view and the side view of the assembled state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on the 2nd modification of 5th Embodiment, respectively. 第５実施形態の第３変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。It is explanatory drawing which shows the plan view and the side view of the assembled state of the pile head reinforcement member applied to the pile head reinforcement structure which concerns on 3rd modification of 5th Embodiment, respectively.

以下に、本発明にかかる杭頭補強構造の好適な実施形態を、添付図面を参照して詳細に説明する。図１は、第１実施形態に係る杭頭補強構造の側面図、図２は、図１に示した杭頭補強構造に備えられる貫通孔及び突出部を説明する説明図、図３は、図１に示した杭頭補強構造への配筋の適用を説明する斜視図である。 Hereinafter, a preferred embodiment of the pile head reinforcing structure according to the present invention will be described in detail with reference to the accompanying drawings. FIG. 1 is a side view of the pile head reinforcing structure according to the first embodiment, FIG. 2 is an explanatory view for explaining a through hole and a protruding portion provided in the pile head reinforcing structure shown in FIG. 1, and FIG. 3 is a view. It is a perspective view explaining the application of the reinforcement arrangement to the pile head reinforcement structure shown in 1.

各種杭が周知であるが、本実施形態に係る杭頭補強構造は、少なくとも杭頭部１ａに鋼管部分（図では、杭頭部自体が鋼管部分である場合を示している）を有する鋼管杭（Ｓ杭）や外殻鋼管付き高強度コンクリート杭（ＳＣ杭）などの杭１に適用される。基礎２中には、基礎鉄筋２ａが埋設される。そして、杭１の杭頭部１ａを基礎２に埋設する際には、杭１と基礎２との間で杭頭部１ａに作用する力を伝達するために、杭頭補強部材３が配設される。 Various types of piles are well known, but in the pile head reinforcement structure according to the present embodiment, a steel pipe pile having a steel pipe portion (in the figure, the pile head itself is a steel pipe portion) at least at the pile head 1a. It is applied to pile 1 such as (S pile) and high-strength concrete pile (SC pile) with outer shell steel pipe. The foundation reinforcing bar 2a is buried in the foundation 2. Then, when the pile head 1a of the pile 1 is embedded in the foundation 2, the pile head reinforcing member 3 is arranged in order to transmit the force acting on the pile head 1a between the pile 1 and the foundation 2. Will be done.

杭頭補強部材３は、基礎２中に上部側が埋設され、下部側が杭頭部１ａの鋼製部分と応力伝達可能に設けられる。従来であれば、杭頭補強部材として異形鉄筋が用いられていて、この場合、鋼管部分に異形鉄筋をフレア溶接し、そして当該鉄筋を基礎に定着することによって、杭と基礎とは剛接合（固定）であると見なされる。 The upper side of the pile head reinforcing member 3 is embedded in the foundation 2, and the lower side is provided so as to be able to transmit stress to the steel portion of the pile head 1a. Conventionally, deformed reinforcing bars have been used as pile head reinforcing members. In this case, the deformed reinforcing bars are flared welded to the steel pipe portion, and the reinforcing bars are fixed to the foundation to rigidly join the pile and the foundation. (Fixed) is considered.

第１実施形態に係る杭頭補強構造は、図１及び図３に示すように、従来の異形鉄筋に代わる杭頭補強部材３として、杭１の杭芯に沿う上下方向に縦向きに長い、上下方向縦向き板状部分３ａと、上下方向縦向き板状部分３ａを、上下方向と交差する左右方向に沿って、横向きに貫通する貫通孔３ｂと、上下方向縦向き板状部分３ａの表面３ｃから突設される突出部３ｄ（図２参照）とを備える鋼製部材を用いて構成される。 As shown in FIGS. 1 and 3, the pile head reinforcement structure according to the first embodiment is a pile head reinforcement member 3 that replaces the conventional deformed reinforcing bar, and is vertically long in the vertical direction along the pile core of the pile 1. A through hole 3b that penetrates the vertical plate-shaped portion 3a in the vertical direction and the vertical plate-shaped portion 3a in the vertical direction in the horizontal direction along the horizontal direction intersecting the vertical direction, and the surface of the vertical plate-shaped portion 3a in the vertical direction. It is constructed by using a steel member having a protruding portion 3d (see FIG. 2) projecting from 3c.

杭頭補強部材３は、杭頭部１ａの周りに間隔を隔てて複数配列される。図示例では、杭頭補強部材３は、杭頭部１ａの周りに互いに等間隔を隔てて（杭頭部２ａ周りに６０°間隔で）、かつ杭芯を中心とする放射方向へ向かって杭頭部１ａから外方に突出させて、６枚が配列して設けられる。 A plurality of pile head reinforcing members 3 are arranged around the pile head 1a at intervals. In the illustrated example, the pile head reinforcing members 3 are spaced apart from each other around the pile head 1a (at intervals of 60 ° around the pile head 2a) and piled in the radial direction centered on the pile core. Six sheets are arranged and provided so as to project outward from the head 1a.

本実施形態にあっては、杭頭補強部材３の上下方向縦向き板状部分３ａは全体が、適宜な一定厚さの一枚の鋼製板で形成される。図示例では、鋼製板は、縦長帯状の長方形で形成されているが、後述する接合面部３ｅが杭頭部１ａの鋼製部分に対し接する態様であれば、その他の形状であってもよい。 In the present embodiment, the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 is entirely formed of a single steel plate having an appropriate constant thickness. In the illustrated example, the steel plate is formed of a vertically long strip-shaped rectangle, but other shapes may be used as long as the joint surface portion 3e described later is in contact with the steel portion of the pile head 1a. ..

杭頭補強部材３の上下方向縦向き板状部分３ａは、下部側が杭頭部１ａの鋼製部分に、隅肉溶接などの一般的な溶接技術により、溶接接合され、これにより鋼製部分との間での応力伝達が確保される。また、杭頭補強部材３の上下方向縦向き板状部分３ａは、上部側が基礎２を形成するコンクリート中に埋設され、これにより、杭頭部１ａに作用する力を、杭１と基礎２との間で伝達する作用が確保される。 The vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 is welded to the steel portion of the pile head 1a on the lower side by a general welding technique such as fillet welding, thereby joining the steel portion. Stress transfer is ensured between. Further, the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 is embedded in the concrete whose upper side forms the foundation 2, whereby the force acting on the pile head 1a is applied to the pile 1 and the foundation 2. The action of transmitting between them is ensured.

図示例にあっては、杭頭補強部材３の上下方向縦向き板状部分３ａは、杭頭部１ａの鋼製部分に対して溶接接合される上下長さ（下部側の長さ）Ｌ１が、杭頭部１ａから上方へ突出されて基礎２中に埋設される上下長さ（上部側の長さ）Ｌ２よりも短く設定される。溶接接合の強度や基礎２との定着性能によっては、上下長さＬ１を上下長さＬ２よりも長くしたり、上下長さＬ１と上下長さＬ２を、ほぼ同じ長さに設定しても良い。 In the illustrated example, the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 has a vertical length (lower length) L1 that is welded to the steel portion of the pile head 1a. , It is set shorter than the vertical length (length on the upper side) L2 which is projected upward from the pile head 1a and embedded in the foundation 2. Depending on the strength of the welded joint and the fixing performance with the foundation 2, the vertical length L1 may be longer than the vertical length L2, or the vertical length L1 and the vertical length L2 may be set to substantially the same length. ..

杭頭補強部材３の上下方向縦向き板状部分３ａは詳細には、その外形形態を画するいくつかの面のうち、杭頭部１ａの鋼製部分に面する接合面部３ｅを有し、この接合面部３ｅが鋼製部分に突き当てられた状態で、両者が溶接接合される。 In detail, the vertically oriented plate-shaped portion 3a of the pile head reinforcing member 3 has a joint surface portion 3e facing the steel portion of the pile head 1a among several surfaces defining its outer shape. In a state where the joint surface portion 3e is abutted against the steel portion, both are welded and joined.

第１実施形態では、接合面部３ｅは、鋼製板（上下方向縦向き部分３ａ）の板表面３ｃ以外の、板端面とされる。図示例に係る長方形の鋼製板の場合には、２つの板表面３ｃ以外の、４つの平坦な板端面のうち、杭芯に沿う上下方向の２つの板端面のいずれかが、杭頭部１ａの鋼製部分に突き当てて溶接接合される接合面部３ｅとされる。この接合面部３ｅは、平坦であって、鋼製部分に対し接する態様で突き当てられ、隅肉溶接等の一般的な溶接技術で鋼製部分に溶接接合される。 In the first embodiment, the joint surface portion 3e is a plate end surface other than the plate surface 3c of the steel plate (vertical vertical portion 3a). In the case of the rectangular steel plate according to the illustrated example, one of the two plate end faces in the vertical direction along the pile core among the four flat plate end faces other than the two plate surfaces 3c is the pile head. It is a joint surface portion 3e that is abutted against the steel portion of 1a and welded and joined. The joint surface portion 3e is flat, is abutted against the steel portion, and is welded to the steel portion by a general welding technique such as fillet welding.

図２は、貫通孔３ｂ及び突出部３ｄを説明する説明図であって、図２（Ａ）は、上下方向縦向き板状部分３ａに一体的に設けられる場合を示し、図２（Ｂ）は、上下方向縦向き板状部分３ａに、貫通孔３ｂ付きの突出部３ｄが別体で設けられる場合を示し、図２（Ｃ）は、貫通孔３ｂを形成した上下方向縦向き板状部分３ａに、穴部３ｆを有する突出部３ｄが別体で設けられる場合を示している。 2A and 2B are explanatory views for explaining the through hole 3b and the protruding portion 3d, and FIG. 2A shows a case where the through hole 3b and the protruding portion 3d are integrally provided in the vertically oriented plate-shaped portion 3a, and FIG. 2 shows a case where a protruding portion 3d with a through hole 3b is separately provided in the vertical vertical plate-shaped portion 3a, and FIG. 2C shows a vertical vertical plate-shaped portion having the through hole 3b formed. 3a shows a case where the protruding portion 3d having the hole portion 3f is separately provided.

上下方向縦向き板状部分３ａに形成される貫通孔３ｂは、これを介して、基礎２を構築するために打設されるコンクリートを杭頭補強部材３周りに円滑に流動させ、充填性を高めると同時に、当該コンクリートを杭頭補強部材３にムラなく密実に付着してそれらを確実に一体化させる。 Through the through hole 3b formed in the vertically oriented plate-shaped portion 3a in the vertical direction, the concrete cast for constructing the foundation 2 is smoothly flowed around the pile head reinforcing member 3 to improve the filling property. At the same time, the concrete is evenly and densely adhered to the pile head reinforcing member 3 to surely integrate them.

また、上下方向縦向き板状部分３ａに設けられる突出部３ｄは、杭頭補強部材３周囲に付着するコンクリートに対する杭頭補強部材３の定着性を向上し、杭頭部１ａに作用する曲げモーメントやせん断力、軸力を杭１と基礎２との間で伝達する作用を確実化する。 Further, the protruding portion 3d provided in the vertically oriented plate-shaped portion 3a improves the fixability of the pile head reinforcing member 3 to the concrete adhering to the periphery of the pile head reinforcing member 3, and the bending moment acting on the pile head 1a. And the action of transmitting shearing force and axial force between pile 1 and foundation 2 are ensured.

図２（Ａ）の場合は、鋼製板（上下方向縦向き板状部分３ａ）にバーリング加工で貫通孔３ｂを形成するようにし、その際に生じる立ち上がり部分が突出部３ｄとされる。 In the case of FIG. 2A, a through hole 3b is formed in a steel plate (vertical vertical plate-shaped portion 3a) by burring, and the rising portion generated at that time is defined as a protruding portion 3d.

図２（Ｂ）の場合は、貫通孔３ｂを有しかつ上下方向縦向き板状部分３ａの板厚よりも長さの長い長尺パイプピースを、上下方向縦向き板状部分３ａに形成した穴３ｇ内部に接合固定するようにし、長尺パイプピースが突出部３ｄとされる。 In the case of FIG. 2B, a long pipe piece having a through hole 3b and longer than the plate thickness of the vertical vertical plate-shaped portion 3a was formed in the vertical vertical plate-shaped portion 3a. The long pipe piece is defined as the protruding portion 3d so as to be joined and fixed inside the hole 3g.

図２（Ｃ）の場合は、上下方向縦向き板状部分３ａに貫通孔３ｂを形成すると共に、当該貫通孔３ｂと略同径の穴部３ｆを有する短尺パイプピースを、穴部３ｆと貫通孔３ｂを位置合わせして、上下方向縦向き板状部分３ａの板表面３ｃに接合固定するようにし、短尺パイプピースが突出部３ｄとされる。 In the case of FIG. 2C, a through hole 3b is formed in the vertically oriented plate-shaped portion 3a in the vertical direction, and a short pipe piece having a hole portion 3f having a diameter substantially the same as the through hole 3b is penetrated through the hole portion 3f. The holes 3b are aligned so as to be joined and fixed to the plate surface 3c of the vertically oriented plate-shaped portion 3a, and the short pipe piece is defined as the protruding portion 3d.

図示例にあっては、突出部３ｄは、貫通孔３ｂをその周りから包囲する形態で形成されている。従って、貫通孔３ｂと突出部３ｄは同数で４つずつ形成されている。このように形成すれば、貫通孔３ｂを介して流動するコンクリートを、スムーズに突出部３ｄ周りに送り込んで密実な付着が確保されると同時に、その突出部３ｄによって定着性能が向上される。しかしながら、貫通孔３ｂと突出部３ｄとは、別々に個別に、互いに異なる位置に形成してもよく、従って、異なる個数で形成されていてもよい。 In the illustrated example, the protruding portion 3d is formed so as to surround the through hole 3b from the periphery thereof. Therefore, the same number of through holes 3b and 4 protruding portions 3d are formed. When formed in this way, the concrete flowing through the through hole 3b is smoothly fed around the protrusion 3d to ensure a solid adhesion, and at the same time, the fixing performance is improved by the protrusion 3d. However, the through holes 3b and the protrusions 3d may be individually formed at different positions from each other, and therefore may be formed in different numbers.

第１実施形態に係る杭頭補強構造の作用について説明すると、図１に示すように、地表面Ｇから突出している杭頭部１ａの鋼製部分に、杭頭補強部材３の上下方向縦向き板状部分３ａの下部側を溶接して、杭頭部１ａに杭頭補強部材３を接合する。これにより、杭頭補強部材３が杭頭部１ａから上方に突出される。 Explaining the operation of the pile head reinforcing structure according to the first embodiment, as shown in FIG. 1, the pile head reinforcing member 3 is vertically oriented in the vertical direction on the steel portion of the pile head 1a protruding from the ground surface G. The lower side of the plate-shaped portion 3a is welded to join the pile head reinforcing member 3 to the pile head 1a. As a result, the pile head reinforcing member 3 is projected upward from the pile head 1a.

次いで、基礎２中に埋設する基礎鉄筋２ａを配筋した後、これら鉄筋２ａ、杭頭補強部材３の上部側並びに杭頭部１ａを埋設するようにして、基礎２を構築するコンクリートを打設する。コンクリートの打設により、杭頭部１ａに作用する曲げモーメントやせん断力、軸力は、杭頭補強部材３によって基礎２と杭１との間で伝達される。 Next, after arranging the foundation reinforcing bars 2a to be buried in the foundation 2, the concrete for constructing the foundation 2 is placed by burying these reinforcing bars 2a, the upper side of the pile head reinforcing member 3 and the pile head 1a. To do. The bending moment, shearing force, and axial force acting on the pile head 1a due to the placement of concrete are transmitted between the foundation 2 and the pile 1 by the pile head reinforcing member 3.

第１実施形態に係る杭頭補強構造では、従来の鉄筋に代えて、上記構成を備える杭頭補強部材３を備えるようにしていて、杭頭補強部材３の上下方向縦向き板状部分３ａに備えた貫通孔３ｂと突出部３ｄとにより、コンクリートの充填性を確保しつつ、コンクリートに対する定着性を向上することができるので、短尺な杭頭補強部材３を用いて、応力伝達作用を適切かつ十分に確保することができ、さらに、基礎２中に埋設される基礎鉄筋２ａと干渉が生じるおそれを低減することができる。 In the pile head reinforcing structure according to the first embodiment, the pile head reinforcing member 3 having the above configuration is provided instead of the conventional reinforcing bar, and the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 is provided. Since the through hole 3b and the protruding portion 3d provided can improve the fixing property to the concrete while ensuring the filling property of the concrete, the short pile head reinforcing member 3 can be used to appropriately perform the stress transmission action. It can be sufficiently secured, and the possibility of interference with the foundation reinforcing bar 2a embedded in the foundation 2 can be reduced.

また、杭頭補強部材３が上下方向縦向き板状部分３ａを有していて、凸凹のある異形鉄筋とは異なり、一般的な溶接技術で杭頭部１ａの鋼製部分に溶接接合することができ、従って、杭頭部１ａに対して応力伝達可能に設ける作業を容易化することができると同時に、溶接欠陥などの発生を抑えて、構造強度を適切に確保することができる。 Further, the pile head reinforcing member 3 has a vertically oriented plate-shaped portion 3a in the vertical direction, and unlike a deformed reinforcing bar having irregularities, it is welded to the steel portion of the pile head 1a by a general welding technique. Therefore, it is possible to facilitate the work of providing the pile head 1a so that stress can be transmitted, and at the same time, it is possible to suppress the occurrence of welding defects and appropriately secure the structural strength.

突出部３ｄが、貫通孔３ｂをその周りから包囲する形態で形成されるようにしたので、これら突出部３ｄと貫通孔３ｂとを別々に形成する場合に比べて、合理的かつ効率的にこれら両者を備えることができ、狭いスペースであってもこれらを多数設けることができると共に、貫通孔３ｂを介して充填性良く流動されるコンクリートが、スムーズに突出部３ｄ周りに送り込まれて、両者の密実な付着を確保することができる。 Since the protruding portion 3d is formed so as to surround the through hole 3b from around the protruding portion 3d, these are rational and efficient as compared with the case where the protruding portion 3d and the through hole 3b are formed separately. Both can be provided, and a large number of these can be provided even in a narrow space, and concrete that flows through the through hole 3b with good filling property is smoothly fed around the protrusion 3d, and both of them are provided. A solid adhesion can be ensured.

杭頭補強部材３の上下方向縦向き板状部分３ａが、鋼製部分に面する接合面部３ｅを有して、接合面部３ｅが鋼製部分に溶接接合される鋼製板で形成されるので、短尺であっても広い定着面積が確保され、かつまた、接合面部３ｅを利用して、容易かつ確実な接合作業で、杭頭補強部材３を杭頭部１ａの鋼製部分に応力伝達可能に設けることができる。 Since the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 has a joint surface portion 3e facing the steel portion, and the joint surface portion 3e is formed of a steel plate welded to the steel portion. A wide fixing area is secured even if it is short, and the pile head reinforcing member 3 can be stress-transmitted to the steel part of the pile head 1a by using the joint surface portion 3e for easy and reliable joining work. Can be provided in.

上下方向縦向き板状部分３ａを構成する鋼製板は、杭頭部１ａの周りに間隔を隔てて複数配列され、接合面部３ｅは鋼製板の板端面であるので、板表面３ｃが杭頭部１ａ外方へ向かって広がる複数の鋼製板により、広い定着領域を確保して、杭頭部１ａを的確かつ十分に補強することができる。 A plurality of steel plates constituting the vertically oriented plate-shaped portion 3a are arranged around the pile head 1a at intervals, and the joint surface portion 3e is the plate end surface of the steel plate, so that the plate surface 3c is a pile. A wide fixing area can be secured by the plurality of steel plates extending outward from the head 1a, and the pile head 1a can be accurately and sufficiently reinforced.

図３に示すように、杭頭補強部材３の貫通孔３ｂに、基礎２に施工される基礎鉄筋２ａを挿通しても良い。これにより、杭頭部１ａに作用する曲げモーメントやせん断力に対する曲げ耐力、せん断耐力を向上させることができる。また、基礎鉄筋２ａに代えて、杭頭補強部材３と杭頭部１ａ周囲のコンクリートとの定着性能をさらに高めるべく、杭頭部１ａの外周面周りに配設される複数本の補強鉄筋を別途用意し、これら補強鉄筋を杭頭補強部材３の貫通孔３ｂにそれぞれ挿通するようにしても良い。この場合、一般周知の継手手段で補強鉄筋の端部同士を連結すれば、定着性能をさらに高めることができると同時に、複数配列された杭頭補強部材３が一体化されることに伴う協働作用により、杭頭補強構造としての性能を向上することができる。 As shown in FIG. 3, the foundation reinforcing bar 2a to be constructed on the foundation 2 may be inserted into the through hole 3b of the pile head reinforcing member 3. As a result, it is possible to improve the bending strength and the shearing strength against the bending moment and the shearing force acting on the pile head 1a. Further, instead of the foundation reinforcing bar 2a, in order to further improve the fixing performance between the pile head reinforcing member 3 and the concrete around the pile head 1a, a plurality of reinforcing bars arranged around the outer peripheral surface of the pile head 1a are provided. It may be prepared separately and these reinforcing reinforcing bars may be inserted into the through holes 3b of the pile head reinforcing member 3, respectively. In this case, if the ends of the reinforcing bars are connected to each other by a well-known joint means, the fixing performance can be further improved, and at the same time, the cooperation associated with the integration of the plurality of arranged pile head reinforcing members 3 By the action, the performance as a pile head reinforcing structure can be improved.

図４は、第１実施形態に係る杭頭補強構造の変形例を示す斜視図である。この変形例では、上下方向縦向き板状部分３ａの接合面部３ｅは、上記実施形態の板端面に代えて、鋼製板の板表面３ｃとされている。 FIG. 4 is a perspective view showing a modified example of the pile head reinforcing structure according to the first embodiment. In this modification, the joint surface portion 3e of the vertically oriented plate-shaped portion 3a is a plate surface 3c of a steel plate instead of the plate end surface of the above embodiment.

板表面３ｃを杭頭部１ａの鋼製部分に押し当てて、当該板表面３ｃ周囲に対し、鋼製部分に対する溶接接合が行われる。この変形例では、溶接接合に代えて、作業が簡便で接合品質が一定のボルト接合を用いても良い。この変形例では、貫通孔３ｂの一部が杭頭部１ａで塞がれる取り付け構造となるが、その他の点は上記実施形態と同等であり、同様な作用効果を奏することができる。 The plate surface 3c is pressed against the steel portion of the pile head 1a, and the steel portion is welded to the periphery of the plate surface 3c. In this modification, instead of the welded joint, a bolt joint that is easy to work and has a constant joint quality may be used. In this modification, a part of the through hole 3b is closed by the pile head 1a, but the other points are the same as those of the above embodiment, and the same effect can be obtained.

図５及び図６には、本発明に係る杭頭補強構造の第２実施形態が示されている。図５は、第２実施形態に係る杭頭補強構造の側面図、図６は、図５に示した杭頭補強構造の斜視図である。 5 and 6 show a second embodiment of the pile head reinforcing structure according to the present invention. FIG. 5 is a side view of the pile head reinforcing structure according to the second embodiment, and FIG. 6 is a perspective view of the pile head reinforcing structure shown in FIG.

第２実施形態は、鋼製板を用いる第１実施形態と異なり、杭頭補強部材４の上下方向縦向き板状部分４ａが鋼製中空筒体で形成される。すなわち、杭頭補強部材４の上下方向縦向き板状部分４ａは、第１実施形態では平板状であったが、第２実施形態では、板状素材から加工成形される筒状とされる。中空筒体の外形形態は、杭頭部１ａの鋼製部分に合わせて通常、円筒状に形成される。杭頭部１ａの形態に合わせる限り、言い換えれば、鋼製部分の形態に沿う形状であれば、その他の形状であっても良い。 In the second embodiment, unlike the first embodiment in which a steel plate is used, the vertical vertical plate-shaped portion 4a of the pile head reinforcing member 4 is formed of a hollow steel cylinder. That is, the vertically oriented plate-shaped portion 4a of the pile head reinforcing member 4 has a flat plate shape in the first embodiment, but in the second embodiment, it has a tubular shape processed and molded from a plate-shaped material. The outer shape of the hollow cylinder is usually formed in a cylindrical shape in accordance with the steel portion of the pile head 1a. As long as it matches the shape of the pile head 1a, in other words, any other shape may be used as long as it conforms to the shape of the steel portion.

中空筒体状の上下方向縦向き板状部分４ａは、杭頭部１ａの鋼製部分の外径寸法よりも僅かに大きな内径寸法で形成される。これにより、杭頭補強部材４を杭頭部１ａに装着した際、その上下方向縦向き板状部分４ａは、杭頭部１ａの外周面にほぼ隙間なく密着される。そして、中空筒体の内周面が鋼製部分に面する接合周面部とされる。接合周面部を有する上下方向縦向き板状部分４ａの下部側が、杭頭部１ａに対しその周りに沿って、隅肉溶接などの一般的な溶接技術を用いて、溶接接合される。なお、中空筒体状の上下方向縦向き板状部分４ａと杭頭部１ａとの溶接接合は、接合周面部である中空筒体の内周面の、杭頭部１ａの鋼管部分上端に位置する部分を、全周に亘って溶接接合しても良い。 The vertical vertical plate-shaped portion 4a having a hollow tubular body is formed with an inner diameter dimension slightly larger than the outer diameter dimension of the steel portion of the pile head 1a. As a result, when the pile head reinforcing member 4 is attached to the pile head 1a, the vertically oriented plate-shaped portion 4a thereof is brought into close contact with the outer peripheral surface of the pile head 1a with almost no gap. Then, the inner peripheral surface of the hollow cylinder is a joint peripheral surface portion facing the steel portion. The lower side of the vertically oriented plate-shaped portion 4a having the joint peripheral surface portion is welded to the pile head 1a along the circumference thereof by using a general welding technique such as fillet welding. The weld joint between the vertical vertical plate-shaped portion 4a in the shape of a hollow cylinder and the pile head 1a is located at the upper end of the steel pipe portion of the pile head 1a on the inner peripheral surface of the hollow cylinder which is the joint peripheral surface portion. The portion to be welded may be welded and joined over the entire circumference.

これにより、上下方向縦向き板状部分４ａの上部側が、基礎２中に埋設される。中空筒体状の上下方向縦向き板状部分４ａには、その全周にわたり、第１実施形態で説明した貫通孔３ｂ及び突出部３ｄが形成される。 As a result, the upper side of the vertically oriented plate-shaped portion 4a is embedded in the foundation 2. The through hole 3b and the protruding portion 3d described in the first embodiment are formed in the vertical vertical plate-shaped portion 4a in the shape of a hollow cylinder over the entire circumference thereof.

第２実施形態に係る杭頭補強構造も、第１実施形態と同様に、杭頭補強部材３の上下方向縦向き板状部分４ａに備えた貫通孔３ｂと突出部３ｄとにより、コンクリートの充填性を確保しつつ、コンクリートに対する定着性を向上することができるので、短尺な杭頭補強部材４を用いて、応力伝達作用を適切かつ十分に確保することができ、さらに、基礎２中に埋設される基礎鉄筋２ａと干渉が生じるおそれを低減することができる。 Similar to the first embodiment, the pile head reinforcing structure according to the second embodiment is also filled with concrete by the through holes 3b and the protruding portions 3d provided in the vertical vertical plate-shaped portion 4a of the pile head reinforcing member 3. Since it is possible to improve the fixing property to concrete while ensuring the property, it is possible to appropriately and sufficiently secure the stress transmission action by using the short pile head reinforcing member 4, and further, it is buried in the foundation 2. It is possible to reduce the possibility of interference with the basic reinforcing bar 2a.

また、杭頭補強部材４が、中空筒体状の上下方向縦向き板状部分４ａを有していて、一般的な溶接技術で杭頭部１ａの鋼製部分に溶接接合することができ、従って、杭頭部１ａに対して応力伝達可能に設ける作業を容易化することができると同時に、溶接欠陥などの発生を抑えて、構造強度を適切に確保することができる。 Further, the pile head reinforcing member 4 has a hollow tubular body-shaped vertical plate-shaped portion 4a, which can be welded to the steel portion of the pile head 1a by a general welding technique. Therefore, it is possible to facilitate the work of providing the pile head 1a so that stress can be transmitted, and at the same time, it is possible to suppress the occurrence of welding defects and the like, and to appropriately secure the structural strength.

図７は、第２実施形態に係る杭頭補強構造の変形例を示す側断面図である。上記第２実施形態では、杭頭補強部材４は、その中空筒体状の上下方向縦向き板状部分４ａが杭頭部１ａの鋼製部分の外径寸法よりも僅かに大きな内径寸法で形成される場合であったが、この変形例では、杭頭部１ａの鋼製部分の内径寸法よりも僅かに小さな外径寸法で形成される。これにより、杭頭補強部材４を杭頭部１ａに装着した際、その上下方向縦向き板状部分４ａは、杭頭部１ａの内周面にほぼ隙間なく密着される。そして、中空筒体の外周面が鋼製部分に面する接合周面部とされる。その他の構成は、上記第２実施形態と同様である。このような変形例であっても、上記第１及び第２実施形態と同様の作用効果を奏することはもちろんである。 FIG. 7 is a side sectional view showing a modified example of the pile head reinforcing structure according to the second embodiment. In the second embodiment, the pile head reinforcing member 4 is formed with a hollow tubular vertical plate-shaped portion 4a having an inner diameter dimension slightly larger than the outer diameter dimension of the steel portion of the pile head 1a. However, in this modified example, the pile head 1a is formed with an outer diameter slightly smaller than the inner diameter of the steel portion. As a result, when the pile head reinforcing member 4 is attached to the pile head 1a, the vertically oriented plate-shaped portion 4a thereof is brought into close contact with the inner peripheral surface of the pile head 1a with almost no gap. Then, the outer peripheral surface of the hollow cylinder is a joint peripheral surface portion facing the steel portion. Other configurations are the same as those in the second embodiment. Of course, even in such a modified example, the same action and effect as those of the first and second embodiments can be obtained.

図８は、本発明に係る杭頭補強構造の第３実施形態を示す斜視図である。第３実施形態は、杭頭補強部材５の下部側を杭頭部１ａの鋼製部分に応力伝達可能に設ける手段が、溶接接合に代えて、基礎２を形成するコンクリートあるいはその他のグラウト材の充填による場合である。杭頭補強部材５の上下方向縦向き板状部分は、貫通孔が形成されない鋼製中空筒体５ａ及び貫通孔３ｂ及び突出部３ｄが形成された鋼製の鋼製板５ｂから構成される。 FIG. 8 is a perspective view showing a third embodiment of the pile head reinforcing structure according to the present invention. In the third embodiment, the means for providing the lower side of the pile head reinforcing member 5 to the steel portion of the pile head 1a so as to be able to transmit stress is made of concrete or other grout material forming the foundation 2 instead of welding. This is the case by filling. The vertical vertical plate-shaped portion of the pile head reinforcing member 5 is composed of a steel hollow cylinder 5a in which no through hole is formed and a steel plate 5b in which a through hole 3b and a protrusion 3d are formed.

中空筒体５ａは、杭頭部１ａを包囲して、杭頭部１ａ周りの地表面Ｇ上に設けられる。中空筒体５ａの内周面と杭頭部１ａの外周面とは、これらの間にコンクリート等を充填するために、間隔が隔てられる。中空筒体５ａの内周面には、その周方向に沿って間隔を隔てて、好ましくは等間隔で、鋼製板５ｂが溶接接合して設けられる。中空筒体５ａの内周面だけでなく、外周面にも鋼製板５ｂを溶接接合して設けるようにしても良い。 The hollow cylinder 5a surrounds the pile head 1a and is provided on the ground surface G around the pile head 1a. The inner peripheral surface of the hollow cylinder 5a and the outer peripheral surface of the pile head 1a are separated from each other in order to fill concrete or the like between them. Steel plates 5b are welded and joined to the inner peripheral surface of the hollow cylinder 5a at intervals, preferably at equal intervals, along the circumferential direction thereof. A steel plate 5b may be welded and joined not only on the inner peripheral surface of the hollow cylinder 5a but also on the outer peripheral surface.

鋼製板５ｂは、杭芯（中空筒体５ａの軸芯）を中心とする放射方向に沿って、中空筒体５ａの内周面から内方へ突出させて設けられる。鋼製板５ｂは、板端面が中空筒体５ａに接合され、板表面が杭芯を中心とする放射方向に沿わされる。鋼製板５ｂは、杭頭部１ａの外周面との間に隙間を隔てるように配設される。鋼製板５ｂには、上述した貫通孔３ｂ及び突出部３ｄが形成される。 The steel plate 5b is provided so as to project inward from the inner peripheral surface of the hollow cylinder 5a along the radial direction centered on the pile core (the shaft core of the hollow cylinder 5a). The end surface of the steel plate 5b is joined to the hollow cylinder 5a, and the plate surface is along the radial direction centered on the pile core. The steel plate 5b is arranged so as to separate a gap from the outer peripheral surface of the pile head 1a. The steel plate 5b is formed with the above-mentioned through holes 3b and protrusions 3d.

杭頭補強部材５は、杭頭部１ａを外方から包囲するように配設され、中空筒体５ａ内部に、杭頭部１ａに対して杭頭補強部材５を応力伝達可能に接合するコンクリート等が充填される。 The pile head reinforcing member 5 is arranged so as to surround the pile head 1a from the outside, and concrete that joins the pile head reinforcing member 5 to the pile head 1a so that stress can be transmitted inside the hollow cylinder 5a. Etc. are filled.

第３実施形態に係る杭頭補強構造では、上記構成を備える杭頭補強部材５を備えるようにしていて、上下方向縦向き板状部分を構成する鋼製板５ｂに備えた貫通孔３ｂと突出部３ｄとにより、コンクリート等の充填性を確保しつつ、コンクリート等に対する定着性を向上することができるので、短尺な杭頭補強部材５を用いて、応力伝達作用を適切かつ十分に確保することができ、さらに、基礎２中に埋設される基礎鉄筋２ａと干渉が生じるおそれを低減することができる。 In the pile head reinforcing structure according to the third embodiment, the pile head reinforcing member 5 having the above configuration is provided, and the through holes 3b and protrusions provided in the steel plate 5b constituting the vertically oriented plate-shaped portion in the vertical direction are provided. Since it is possible to improve the fixability to concrete or the like while ensuring the filling property of concrete or the like by the portion 3d, it is necessary to appropriately and sufficiently secure the stress transmission action by using the short pile head reinforcing member 5. Further, it is possible to reduce the possibility of interference with the foundation reinforcing bar 2a embedded in the foundation 2.

また、杭頭補強部材５を、コンクリート等の充填によって杭頭部１ａに応力伝達可能に接合して設けることができるので、当該接合作業を単純な充填作業によって容易化することができると同時に、構造的な欠陥の発生などを抑えて、構造強度を適切に確保することができる。 Further, since the pile head reinforcing member 5 can be provided by joining the pile head reinforcing member 5 to the pile head 1a so as to be able to transmit stress by filling concrete or the like, the joining work can be facilitated by a simple filling work, and at the same time. It is possible to appropriately secure the structural strength by suppressing the occurrence of structural defects.

図９から図１８には、本発明に係る杭頭補強構造の第４実施形態が示されている。第４実施形態は、中空筒状の杭、例えば鋼管杭（Ｓ杭）に適用して好ましいものである。図９は、第４実施形態に係る杭頭補強構造の斜視図、図１０は、図９に示した杭頭補強構造を説明する説明図であって、図１０（ａ）は平面図、図１０（ｂ）は正面図、図１０（ｃ）は側面図、図１０（ｄ）は図１０（ａ）中、Ａ−Ａ線矢視断面図、図１１は、図９に示した杭頭補強構造に用いられる部品を説明する説明図であって、図１１（ａ）及び（ｂ）はそれぞれ杭頭補強部材の正面図、図１２は、第４実施形態の第１変形例に係る杭頭補強構造を説明する説明図であって、図１２（ａ）は斜視図、図１２（ｂ）は、図１２（ａ）中、Ｂ−Ｂ線矢視断面図、図１３は、第４実施形態の第２変形例に係る杭頭補強構造を説明する説明図であって、図１３（ａ）は斜視図、図１３（ｂ）は、図１３（ａ）中、Ｃ−Ｃ線矢視断面図、図１４は、図１３に示した杭頭補強構造に用いられる部品を説明する説明図であって、図１４（ａ）は堰部材の平面図、図１４（ｂ）は、堰部材の他の例の平面視及び側面視をそれぞれ示す図、図１５は、第４実施形態の第３変形例に係る杭頭補強構造を説明する説明図であって、図１５（ａ）は斜視図、図１５（ｂ）は、図１５（ａ）中、Ｄ−Ｄ線矢視断面図、図１６は、図１５に示した杭頭補強構造に用いられる部品の一部である杭頭補強部材の平面視及び側面視をそれぞれ示す説明図、図１７は、第４実施形態の第４変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図、図１８は、第４実施形態の第５変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。 9 to 18 show a fourth embodiment of the pile head reinforcing structure according to the present invention. The fourth embodiment is preferably applied to a hollow tubular pile, for example, a steel pipe pile (S pile). 9 is a perspective view of the pile head reinforcing structure according to the fourth embodiment, FIG. 10 is an explanatory view for explaining the pile head reinforcing structure shown in FIG. 9, and FIG. 10A is a plan view and a view. 10 (b) is a front view, FIG. 10 (c) is a side view, FIG. 10 (d) is a cross-sectional view taken along the line AA in FIG. 10 (a), and FIG. 11 is a pile head shown in FIG. 11 (a) and 11 (b) are front views of the pile head reinforcing member, respectively, and FIG. 12 is a pile according to the first modification of the fourth embodiment, which are explanatory views for explaining the parts used in the reinforcing structure. 12 (a) is a perspective view, FIG. 12 (b) is a sectional view taken along line BB in FIG. 12 (a), and FIG. 13 is a fourth view, which is an explanatory view for explaining the head reinforcement structure. It is explanatory drawing explaining the pile head reinforcement structure which concerns on the 2nd modification of embodiment, FIG. 13A is a perspective view, and FIG. 13B is a line arrow CC in FIG. 13A. The cross-sectional view and FIG. 14 are explanatory views for explaining the parts used in the pile head reinforcing structure shown in FIG. 13, FIG. 14A is a plan view of the dam member, and FIG. 14B is a dam. A view showing a plan view and a side view of other examples of the member, respectively, FIG. 15 is an explanatory view for explaining the pile head reinforcement structure according to the third modification of the fourth embodiment, and FIG. 15A is an explanatory view. A perspective view, FIG. 15 (b) is a cross-sectional view taken along the line DD in FIG. 15 (a), and FIG. 16 is a pile head which is a part of parts used in the pile head reinforcing structure shown in FIG. Explanatory views and side views showing the plan view and the side view of the reinforcing member, respectively, show the plan view and the side view of the assembled state of the pile head reinforcing member applied to the pile head reinforcing structure according to the fourth modification of the fourth embodiment. 18 and 18 are explanatory views showing a plan view and a side view of the assembled state of the pile head reinforcing member applied to the pile head reinforcing structure according to the fifth modification of the fourth embodiment, respectively.

まず、第４実施形態について、図９〜図１１を参照して説明すると、杭頭補強部材３は、杭頭部１ａの直上を水平横向き方向に跨ぐ鋼製の横向き板状部分３ｈを備える。横向き板状部分３ｈは、上下方向縦向き板状部分３ａ、例えば第１実施形態で説明した上下方向縦向き板状部分３ａに連設される。 First, the fourth embodiment will be described with reference to FIGS. 9 to 11. The pile head reinforcing member 3 includes a steel lateral plate-shaped portion 3h that straddles directly above the pile head 1a in the horizontal horizontal direction. The horizontal plate-shaped portion 3h is continuously provided with the vertical vertical plate-shaped portion 3a, for example, the vertical vertical plate-shaped portion 3a described in the first embodiment.

横向き板状部分３ｈは、例えば平面長方形状の外形形態を画する面のうち、板表裏の板表面３ｃが横向きに向けられ、板表面３ｃ以外の四方の板端面のうち、跨ぐ方向の板端面が上下方向縦向き板状部分３ａに向けられ、跨ぐ方向と交差する方向の一対の板端面の一方（前述した接合面部３ｅとなる）が杭頭部１ａの上向き頂面１ｂに向けられ、他方の板端面が上方に向くようにして、杭頭部１ａ直上に板表面３ｃを立てた状態で設けられる。 In the sideways plate-shaped portion 3h, for example, among the surfaces that demarcate the outer shape of a flat rectangular shape, the plate surface 3c on the front and back of the plate is directed sideways, and among the plate end surfaces on all sides other than the plate surface 3c, the plate end surface in the straddling direction Is directed toward the vertical plate-shaped portion 3a in the vertical direction, and one of the pair of plate end surfaces (which becomes the joint surface portion 3e described above) in the direction of straddling and intersecting is directed toward the upward top surface 1b of the pile head 1a, and the other. The plate surface 3c is provided in a state of standing directly above the pile head 1a so that the plate end surface of the plate faces upward.

横向き板状部分３ｈは、杭頭部１ａを挟んで当該杭頭部１ａの両側に配置される上下方向縦向き板状部分３ａを連結する。従って、杭頭補強部材３は、杭頭部１ａを水平横向き方向に跨ぐ向きにおいて、中央に横向き板状部分３ｈを備え、横向き板状部分３ｈの両端それぞれに上下方向縦向き板状部分３ａを備えて構成される。 The horizontal plate-shaped portion 3h connects the vertical vertical plate-shaped portions 3a arranged on both sides of the pile head 1a with the pile head 1a interposed therebetween. Therefore, the pile head reinforcing member 3 is provided with a horizontal plate-shaped portion 3h in the center in a direction straddling the pile head 1a in the horizontal horizontal direction, and vertically oriented plate-shaped portions 3a are provided at both ends of the horizontal plate-shaped portion 3h. Be prepared.

図示例では、杭頭補強部材３は、上下方向縦向き板状部分３ａと横向き板状部分３ｈとが単一の板材から一体的に形成されている。もちろん、横向き板状部分３ｈと上下方向縦向き板状部分３ａとを別体で形成して、一体的に接合するようにしても良い。 In the illustrated example, in the pile head reinforcing member 3, the vertical plate-shaped portion 3a and the horizontal plate-shaped portion 3h are integrally formed from a single plate material. Of course, the horizontal plate-shaped portion 3h and the vertical vertical plate-shaped portion 3a may be formed as separate bodies and integrally joined.

また図示例では、杭頭部１ａが平断面円形状であって、杭頭補強部材３は、横向き板状部分３ｈが杭頭部１ａの中心（杭芯）を経過するように、当該杭頭部１ａをその直径方向に跨ぐように配置されている。しかしながら、杭頭補強部材３は、横向き板状部分３ｈが杭頭部１ａの直上を跨ぐ形態であれば、直径方向に跨ぐことに限定されず、杭芯を避けた位置を跨ぐ形態（例えば、後述する井桁状）であっても良い。 Further, in the illustrated example, the pile head 1a has a circular shape with a flat cross section, and the pile head reinforcing member 3 has a pile head such that the lateral plate-shaped portion 3h passes through the center (pile core) of the pile head 1a. The portion 1a is arranged so as to straddle the portion 1a in the radial direction thereof. However, the pile head reinforcing member 3 is not limited to straddling in the radial direction as long as the lateral plate-shaped portion 3h straddles directly above the pile head 1a, and straddles a position avoiding the pile core (for example,). It may be in the shape of a stake, which will be described later.

また、図示例では、２つの杭頭補強部材３の横向き板状部分３ｈが杭頭部１ａの中心（杭芯）で直交配置されている。従って、上下方向縦向き板状部分３ａは、４つ備えられ、これら上下方向縦向き板状部分３ａは、杭頭部１ａの周りに適宜間隔を隔てて配列される。 Further, in the illustrated example, the lateral plate-shaped portions 3h of the two pile head reinforcing members 3 are arranged orthogonally at the center (pile core) of the pile head 1a. Therefore, four vertical vertical plate-shaped portions 3a are provided, and these vertical vertical plate-shaped portions 3a are arranged around the pile head 1a at appropriate intervals.

図１１に示すように、例えば各横向き板状部分３ｈの横向き方向中央には、これらを板厚方向に貫通して、下向き嵌め合わせ溝６と上向き嵌め合わせ溝７とが形成され、これら嵌め合わせ溝６，７を上下に嵌め合わせることにより、２つの杭頭補強部材３は、それらの横向き板状部分３ｈが嵌め合わせ構造で組み合わされている。 As shown in FIG. 11, for example, in the center of each lateral plate-shaped portion 3h in the lateral direction, a downward fitting groove 6 and an upward fitting groove 7 are formed by penetrating them in the plate thickness direction, and these fitting grooves are formed. By fitting the grooves 6 and 7 vertically, the two pile head reinforcing members 3 are combined with their lateral plate-shaped portions 3h in a fitting structure.

しかしながら、杭頭補強部材３を３つ以上用い、それらの横向き板状部分３ｈを杭頭部１ａ直上で放射状に配列し、６つ以上の上下方向縦向き板状部分３ａを備えるようにしても良い。このような場合を想定すると、杭頭補強部材３同士の組立は、上記嵌め合わせ構造に限られず、２つ以上の横向き板状部分３ｈを、杭頭部１ａの周方向に循環するように放射状に並べて、互いに溶接接合して構成される。あるいは、いずれかの横向き板状部分３ｈの板表面に、他の横向き板状部分３ｈの板端面を突き合わせて溶接接合して構成される。 However, even if three or more pile head reinforcing members 3 are used and their lateral plate-shaped portions 3h are arranged radially directly above the pile head 1a, six or more vertical vertical plate-shaped portions 3a are provided. good. Assuming such a case, the assembly of the pile head reinforcing members 3 is not limited to the above-mentioned fitting structure, and two or more lateral plate-shaped portions 3h are radially circulated in the circumferential direction of the pile head 1a. It is constructed by arranging them side by side and welding them together. Alternatively, the plate surface of any of the lateral plate-shaped portions 3h is welded and joined by abutting the plate end surfaces of the other lateral plate-shaped portions 3h.

横向き板状部分３ｈには、上述した上下方向縦向き板状部分３ａと同様にして、貫通孔３ｂと突出部３ｄとが備えられる。図示例では、貫通孔３ｂ及び突出部３ｄは、杭頭部１ａの中心を挟んで上下に１つずつ、４つ設けられている。横向き板状部分３ｈの両端側の上下方向縦向き板状部分３ａそれぞれにも、上下に１つずつ設けられている。また、図示例では、連続する横向き板状部分３ｈ及び上下方向縦向き板状部分３ａの突出部３ｄが、すべて同じ向きに突設されているが、突設方向は適宜に異ならせても良い。 The horizontal plate-shaped portion 3h is provided with a through hole 3b and a protruding portion 3d in the same manner as the vertical vertical plate-shaped portion 3a described above. In the illustrated example, four through holes 3b and four protruding portions 3d are provided one above and one below the center of the pile head 1a. Each of the vertically oriented vertical plate-shaped portions 3a on both end sides of the horizontally oriented plate-shaped portion 3h is also provided one above and one below. Further, in the illustrated example, the continuous horizontal plate-shaped portion 3h and the protruding portion 3d of the vertical vertical plate-shaped portion 3a are all projecting in the same direction, but the projecting directions may be appropriately different. ..

要するに、第４実施形態に用いられる杭頭補強部材３は、上下方向縦向き板状部分３ａに加えて、当該上下方向縦向き板状部分３ａと連結されると共に杭頭部１ａの直上を横向き方向に跨ぐ横向き板状部分３ｈを備えて構成されると共に、これら板状部分３ａ，３ｈのいずれにも貫通孔３ｂ及び突出部３ｄが備えられ、杭頭部１ａの上向き頂面１ｂに対し、これに向けられた横向き板状部分３ｈの板端面（接合面部３ｅ）を載せることで、杭頭部１ａ上に仮置きされるようになっている。 In short, the pile head reinforcing member 3 used in the fourth embodiment is connected to the vertical vertical plate-shaped portion 3a in addition to the vertical vertical plate-shaped portion 3a, and is horizontally oriented directly above the pile head 1a. A lateral plate-shaped portion 3h straddling the direction is provided, and each of the plate-shaped portions 3a and 3h is provided with a through hole 3b and a protruding portion 3d, with respect to the upward top surface 1b of the pile head 1a. By placing the plate end surface (joint surface portion 3e) of the lateral plate-shaped portion 3h directed to this, it is temporarily placed on the pile head 1a.

第４実施形態では、杭頭補強部材３は、杭頭部１ａの鋼製部分との間で応力伝達するために、上下方向縦向き板状部分３ａ及び横向き板状部分３ｈの少なくともいずれか一方が杭頭部１ａに溶接接合される。 In the fourth embodiment, the pile head reinforcing member 3 has at least one of a vertical plate-shaped portion 3a and a horizontal plate-shaped portion 3h in order to transmit stress to and from the steel portion of the pile head 1a. Is welded to the pile head 1a.

図示例では、杭頭部１ａの上向き頂面１ｂに対し、これに向けられた横向き板状部分３ｈの板端面が接合面部３ｅとされ、この接合面部３ｅと杭頭部１ａの上向き頂面１ｂとが突き合わされて溶接接合され、これにより横向き板状部分３ｈそのものによって、そしてまた当該横向き板状部分３ｈを介して上下方向縦向き板状部分３ａが杭頭部１ａに接合されることによって、これら板状部分３ａ，３ｈと鋼製部分との間の応力伝達が確保される。 In the illustrated example, with respect to the upward top surface 1b of the pile head 1a, the plate end surface of the lateral plate-shaped portion 3h directed to the joint surface portion 3e is defined as the joint surface portion 3e, and the joint surface portion 3e and the upward top surface 1b of the pile head 1a. Are abutted and welded together, thereby joining the vertical plate-like portion 3a to the pile head 1a by the lateral plate-like portion 3h itself, and also by joining the vertical vertical plate-like portion 3a via the horizontal plate-like portion 3h. Stress transmission between these plate-shaped portions 3a and 3h and the steel portion is ensured.

第４実施形態では、杭頭補強部材３の上下方向縦向き板状部分３ａに加えて、横向き板状部分３ｈによって鋼製部分との間での応力伝達が確保される。また、杭頭補強部材３の上下方向縦向き板状部分３ａ及び横向き板状部分３ｈが、基礎２を形成するコンクリート中に埋設され、これにより、杭頭部１ａに作用する力を、杭１と基礎２との間で伝達する作用が確保される。 In the fourth embodiment, in addition to the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3, the horizontal plate-shaped portion 3h secures stress transmission to and from the steel portion. Further, the vertical vertical plate-shaped portion 3a and the horizontal plate-shaped portion 3h of the pile head reinforcing member 3 are embedded in the concrete forming the foundation 2, thereby exerting a force acting on the pile head 1a on the pile 1. The action of transmitting between and the foundation 2 is ensured.

第４実施形態に係る杭頭補強構造の作用について説明すると、図９に示すように、地表面Ｇから突出している杭頭部１ａの鋼製部分に、杭頭補強部材３の横向き板状部分３ｈの接合面部３ｅを溶接して、杭頭部１ａに杭頭補強部材３を接合する。これにより、杭頭補強部材３が杭頭部１ａ上方に突設される。 Explaining the operation of the pile head reinforcing structure according to the fourth embodiment, as shown in FIG. 9, a lateral plate-shaped portion of the pile head reinforcing member 3 is formed on a steel portion of the pile head 1a protruding from the ground surface G. The joint surface portion 3e of 3h is welded to join the pile head reinforcing member 3 to the pile head 1a. As a result, the pile head reinforcing member 3 is projected above the pile head 1a.

次いで、基礎中に埋設する基礎鉄筋を配筋した後、これら鉄筋、杭頭補強部材３並びに杭頭部１ａを埋設するようにして、基礎を構築するコンクリートを打設する。コンクリートの打設により、杭頭部１ａに作用する曲げモーメントやせん断力、軸力は、杭頭補強部材３によって基礎と杭１との間で伝達される。 Next, after arranging the foundation reinforcing bars to be buried in the foundation, the concrete for constructing the foundation is placed by burying these reinforcing bars, the pile head reinforcing member 3 and the pile head 1a. The bending moment, shearing force, and axial force acting on the pile head 1a due to the placement of concrete are transmitted between the foundation and the pile 1 by the pile head reinforcing member 3.

第４実施形態に係る杭頭補強構造にあっては、杭頭補強部材３が、杭頭部１ａの直上を横向き方向に跨ぐ横向き板状部分３ｈを備え、横向き板状部分３ｈは、杭頭部１ａを挟んで当該杭頭部１ａの両側に配置される上下方向縦向き板状部分３ａを連結して構成されるので、横向き板状部分３ｈ自体、そしてまた横向き板状部分３ｈを介する上下方向縦向き板状部分３ａの杭頭部１ａへの接合によって、鋼製部分との応力伝達性能を向上することができる。 In the pile head reinforcing structure according to the fourth embodiment, the pile head reinforcing member 3 includes a lateral plate-shaped portion 3h straddling directly above the pile head 1a in the lateral direction, and the lateral plate-shaped portion 3h is a pile head. Since the vertical vertical plate-shaped portions 3a arranged on both sides of the pile head 1a are connected to each other with the portion 1a in between, the horizontal plate-shaped portion 3h itself and the upper and lower portions via the horizontal plate-shaped portion 3h are also provided. By joining the vertically oriented plate-shaped portion 3a to the pile head 1a, the stress transfer performance with the steel portion can be improved.

横向き板状部分３ｈを備えることにより、上下方向縦向き板状部分３ａの杭頭部１ａ上方への突出量を抑えることができ、杭頭部１ａ直上に配される基礎配筋等各種配筋との干渉をなくして、杭頭部１ａの四方に均等に配筋することができる。また、杭頭補強部材３が、杭頭部１ａから側方へ向かって張り出すので、大きな曲げ抵抗力を発揮させることができる。 By providing the horizontal plate-shaped portion 3h, it is possible to suppress the amount of protrusion of the vertical plate-shaped portion 3a in the vertical direction upward of the pile head 1a, and various reinforcements such as foundation reinforcement arranged directly above the pile head 1a. Reinforcements can be evenly distributed on all sides of the pile head 1a without interference with Further, since the pile head reinforcing member 3 projects laterally from the pile head 1a, a large bending resistance force can be exerted.

横向き板状部分３ｈは、上下方向縦向き板状部分３ａに連結されるので、杭頭補強部材３自体の強度を増大することができる。施工に際しては、横向き板状部分３ｈを利用して杭頭補強部材３を杭頭部１ａ上に仮置きすることができて、作業性を向上することができる。横向き板状部分３ｈに設けられる貫通孔３ｂ及び突出部３ｄは、上下方向縦向き板状部分３ａに設けられる貫通孔３ｂ及び突出部３ｄと同様の構成及び作用効果を確保することができる。 Since the horizontal plate-shaped portion 3h is connected to the vertical plate-shaped portion 3a in the vertical direction, the strength of the pile head reinforcing member 3 itself can be increased. At the time of construction, the pile head reinforcing member 3 can be temporarily placed on the pile head 1a by using the lateral plate-shaped portion 3h, and the workability can be improved. The through hole 3b and the protruding portion 3d provided in the lateral plate-shaped portion 3h can secure the same configuration and action and effect as the through hole 3b and the protruding portion 3d provided in the vertical vertical plate-shaped portion 3a.

そしてこのような第４実施形態であっても、上記第１実施形態と同様の作用効果を奏することはもちろんである。 And, of course, even in such a fourth embodiment, the same action and effect as those in the first embodiment can be obtained.

図１２には、第４実施形態に係る杭頭補強構造の第１変形例が示されている。第１変形例では、杭頭部１ａには、横向き板状部分３ｈが接合される環状の上向き頂面１ｂに、その周方向に沿って環状の鋼製鍔部として鍔部材８が溶接接合され、この鍔部材８に杭頭補強部材３の横向き板状部分３ｈの接合面部３ｅが溶接接合される。別体の鍔部材８に代えて、杭頭部１ａの上向き頂面１ｂにこれを拡張する加工を施して、鋼製鍔部を杭頭部１ａに一体的に形成するようにしてもよい。鍔部材８は、予め杭頭補強部材３側に接合しておくようにしても良い。 FIG. 12 shows a first modification of the pile head reinforcing structure according to the fourth embodiment. In the first modification, a flange member 8 is welded to the pile head 1a as an annular steel flange portion along the circumferential direction to the annular upward top surface 1b to which the lateral plate-shaped portion 3h is bonded. , The joint surface portion 3e of the lateral plate-shaped portion 3h of the pile head reinforcing member 3 is welded to the flange member 8. Instead of the separate collar member 8, the upward top surface 1b of the pile head 1a may be subjected to a process to extend the pile head 1a so that the steel collar portion is integrally formed with the pile head 1a. The collar member 8 may be joined to the pile head reinforcing member 3 side in advance.

第４実施形態では、杭頭部１ａの上向き頂面１ｂに対し、単に突き合わせて横向き板状部分３ｈの接合面部３ｅを溶接接合するため、溶接長を十分に確保できないと共に、その杭頭部１ａの上向き頂面１ｂ周辺が応力集中により局部的な変形を起こす場合があるが、第１変形例では、鍔部材８を備えることにより、溶接長を長く確保することができ、鋼製部分と杭頭補強部材３との接合強度を高く確保することができる。また、鍔部材８によって、応力伝達作用を営む杭頭部１ａの上向き頂面１ｂ周辺の強度を増強することができ、局部的な変形を防止することができる。 In the fourth embodiment, since the joint surface portion 3e of the lateral plate-shaped portion 3h is simply welded to the upward top surface 1b of the pile head 1a, the welding length cannot be sufficiently secured and the pile head 1a is formed. The area around the upward top surface 1b may be locally deformed due to stress concentration, but in the first deformation example, by providing the flange member 8, the welding length can be secured long, and the steel portion and the pile It is possible to secure a high joint strength with the head reinforcing member 3. Further, the flange member 8 can increase the strength around the upward top surface 1b of the pile head 1a that performs a stress transmitting action, and can prevent local deformation.

図１３及び図１４には、第４実施形態に係る杭頭補強構造の第２変形例が示されている。第２変形例は、鋼管杭などのように杭頭部１ａが中空筒状に形成されている場合に、杭頭補強部材３の横向き板状部分３ｈに、基礎を構築するコンクリートを堰き止めるための鋼製の堰部材９を備えるようにしたものである。 13 and 14 show a second modification of the pile head reinforcing structure according to the fourth embodiment. In the second modification, when the pile head 1a is formed in a hollow tubular shape like a steel pipe pile, the concrete for constructing the foundation is dammed to the lateral plate-shaped portion 3h of the pile head reinforcing member 3. The steel weir member 9 is provided.

堰部材９は、杭頭部１ａの内方に挿入可能に、杭頭部１ａの内径以下の外径の板材で形成される。図示例では、杭頭部１ａが平断面円形状なので、堰部材９は図１４（ａ）に示すように、円形状に形成されている。しかしながら、堰部材９は、杭頭部１ａの内方に挿入可能で、コンクリートを堰き止める形状であれば、円形状に限定されず、杭頭部１ａの平断面と異なる形状であっても良い。また図示例では、横向き板状部分３ｈには、杭頭部１ａの内方へ挿入可能な延長部分３ｉが形成され、この延長部分３ｉに堰部材９が溶接接合されている。 The weir member 9 is formed of a plate material having an outer diameter equal to or smaller than the inner diameter of the pile head 1a so that it can be inserted inside the pile head 1a. In the illustrated example, since the pile head 1a has a circular shape with a flat cross section, the weir member 9 is formed in a circular shape as shown in FIG. 14A. However, the weir member 9 is not limited to a circular shape as long as it can be inserted inside the pile head 1a and has a shape that dams concrete, and may have a shape different from the plan cross section of the pile head 1a. .. Further, in the illustrated example, an extension portion 3i that can be inserted inward of the pile head 1a is formed in the lateral plate-shaped portion 3h, and the weir member 9 is welded to the extension portion 3i.

図示例では、２つの杭頭補強部材３の横向き板状部分３ｈが直交しているので、延長部分３ｉは平面十字状に形成されていて、堰部材９はこの十字状の延長部分３ｉに接合されている。堰部材９には、図１４（ｂ）に示すように、横向き板状部分３ｈもしくは延長部分３ｉが形成されている場合には当該延長部分３ｉの下端側の形態に合わせて、嵌め込み溝１０を形成し、この嵌め込み溝１０を介して、横向き板状部分３ｈ等に接合するようにしても良い。図示例では、十字状の嵌め込み溝１０が示されている。 In the illustrated example, since the lateral plate-shaped portions 3h of the two pile head reinforcing members 3 are orthogonal to each other, the extension portion 3i is formed in a plane cross shape, and the weir member 9 is joined to the cross-shaped extension portion 3i. Has been done. As shown in FIG. 14B, the weir member 9 is provided with a fitting groove 10 according to the shape of the lower end side of the extension portion 3i when the lateral plate-like portion 3h or the extension portion 3i is formed. It may be formed and joined to the lateral plate-shaped portion 3h or the like through the fitting groove 10. In the illustrated example, the cross-shaped fitting groove 10 is shown.

嵌め込み溝１０を形成する場合、堰部材９は、１枚の板材９ａの上に、嵌め込み溝１０分の間隔を隔てる複数枚の板片９ｂを重ね合わせ接合することで形成するようにしてもよい。 When forming the fitting groove 10, the weir member 9 may be formed by superimposing and joining a plurality of plate pieces 9b separated by an interval of 10 minutes on one plate material 9a. ..

延長部分３ｉにより、杭頭補強部材３を杭頭部１ａに嵌め合わせて、前後左右水平方向に対する位置決めをすることができる。また、杭頭補強部材３の平面上の向きを設定する場合、延長部分３ｉを利用することで、杭頭補強部材３を杭頭部１ａ周りに回して向きを設定することができる。 With the extension portion 3i, the pile head reinforcing member 3 can be fitted to the pile head 1a and positioned in the front-back, left-right, and horizontal directions. Further, when setting the orientation of the pile head reinforcing member 3 on a plane, the orientation can be set by turning the pile head reinforcing member 3 around the pile head 1a by using the extension portion 3i.

第２変形例にあっても、杭頭補強部材３は、横向き板状部分３ｈの接合面部３ｅと杭頭部１ａの上向き頂面１ｂとが突き合わされて溶接接合され、これにより応力伝達が確保される。堰部材９の端縁を杭頭部１ａの内面に溶接接合しても良い。さらに、延長部分３ｉを杭頭部１ａの内面に溶接接合しても良い。第２変形例では、基礎を構築するコンクリートを堰き止めるための堰部材９を備えたので、杭１内部にコンクリートが入り込むことを抑制することができる。 Even in the second modification, the pile head reinforcing member 3 is welded by abutting the joint surface portion 3e of the lateral plate-shaped portion 3h and the upward top surface 1b of the pile head 1a, thereby ensuring stress transmission. Will be done. The edge of the weir member 9 may be welded to the inner surface of the pile head 1a. Further, the extension portion 3i may be welded and joined to the inner surface of the pile head 1a. In the second modification, since the weir member 9 for damming the concrete for constructing the foundation is provided, it is possible to prevent the concrete from entering the inside of the pile 1.

また、堰部材９、そしてまた延長部分３ｉにより、杭頭補強部材３と鋼製部分との溶接長を長く確保できて、鋼製部分と杭頭補強部材３との接合強度を高く確保することができる。また、堰部材９、そしてまた延長部分３ｉによって、応力伝達作用を営む杭頭部１ａの上向き頂１ｂ面周辺の強度を増強することができる。 Further, the weir member 9 and the extension portion 3i can secure a long welding length between the pile head reinforcing member 3 and the steel portion, and secure a high joint strength between the steel portion and the pile head reinforcing member 3. Can be done. Further, the weir member 9 and also the extension portion 3i can enhance the strength around the upward top 1b surface of the pile head 1a that performs the stress transmission action.

図１５及び図１６には、第４実施形態に係る杭頭補強構造の第３変形例が示されている。図９〜図１４に示した第４実施形態に用いられる杭頭補強部材３では、上下方向縦向き板状部分３ａが杭頭部１ａ上方に位置される場合であったが、第２変形例を示す図１３と対比することで理解されるように、第３変形例では、上下方向縦向き板状部分３ａが、杭頭部１ａの側方で、杭芯に沿う上下方向に沿って垂下されている。 15 and 16 show a third modification of the pile head reinforcing structure according to the fourth embodiment. In the pile head reinforcing member 3 used in the fourth embodiment shown in FIGS. 9 to 14, the vertical plate-shaped portion 3a was located above the pile head 1a, but the second modification As can be understood by comparing with FIG. 13, in the third modification, the vertical plate-shaped portion 3a in the vertical direction hangs down along the vertical direction along the pile core on the side of the pile head 1a. Has been done.

従って、第３変形例では、杭頭補強部材３を、上記第２変形例で説明したように溶接接合し得ることに加えて、上記第１実施形態と同様に、上下方向縦向き板状部分３ａを杭頭部１ａに溶接接合することが可能であって、さらには、両方の板状部分３ａ，３ｈを、そしてまた堰部材９も、杭頭部１ａに溶接接合しても良い。 Therefore, in the third modification, in addition to being able to weld and join the pile head reinforcing member 3 as described in the second modification, as in the first embodiment, the vertical plate-shaped portion in the vertical direction It is possible to weld 3a to the pile head 1a, and further, both plate-shaped portions 3a and 3h, and also the dam member 9 may be welded to the pile head 1a.

また、図１６に示すように、杭頭補強部材３の組立としては、図１４（ｂ）に示した嵌め込み溝１０を用いることなく、杭頭部１ａを跨ぐ方向でいずれかの杭頭補強部材３の横向き板状部分３ｈの中央に、他の杭頭補強部材３の横向き板状部分３ｈを当該跨ぐ方向で二分したものを溶接接合して、これを単体ユニット１１として設置施工するようにしても良い。 Further, as shown in FIG. 16, as the assembly of the pile head reinforcing member 3, one of the pile head reinforcing members in the direction straddling the pile head 1a without using the fitting groove 10 shown in FIG. 14 (b). At the center of the lateral plate-shaped portion 3h of 3, the lateral plate-shaped portion 3h of the other pile head reinforcing member 3 is divided into two in the straddling direction and joined by welding, and this is installed and constructed as a single unit 11. Is also good.

第３変形例では、杭頭部１ａに対する杭頭補強部材３の溶接長を自在に長く確保することができ、応力伝達性能をさらに向上することができる。 In the third modification, the welding length of the pile head reinforcing member 3 with respect to the pile head 1a can be freely secured to be long, and the stress transmission performance can be further improved.

図１７には、第４実施形態に係る杭頭補強構造の第４変形例が示されている。第４変形例の杭頭補強部材３では、図１２に示した上記第１変形例に対し、横向き板状部分３ｈの貫通孔３ｂ及び突出部３ｄが省略されている。 FIG. 17 shows a fourth modification of the pile head reinforcing structure according to the fourth embodiment. In the pile head reinforcing member 3 of the fourth modified example, the through hole 3b and the protruding portion 3d of the lateral plate-shaped portion 3h are omitted from the first modified example shown in FIG.

図１８には、第４実施形態に係る杭頭補強構造の第５変形例が示されている。第５変形例の杭頭補強部材３は、図１３に示した十字形に組み合わせた上記第２変形例に対し、杭芯を包囲するようにして、４つの杭頭補強部材３の横向き板状部分３ｈを平面井桁状に組んで構成されている。 FIG. 18 shows a fifth modification of the pile head reinforcing structure according to the fourth embodiment. The pile head reinforcing member 3 of the fifth modified example has a lateral plate shape of the four pile head reinforcing members 3 so as to surround the pile core with respect to the second modified example combined in the cross shape shown in FIG. The portion 3h is assembled in a flat grid shape.

第５変形例では、平面井桁状であることから、杭頭部１ａの狭いスペースに、定着面積を効率よく確保できる稠密さと構造的な剛強さを備える杭頭補強部材３の組立体１２を構成することができ、高い応力伝達性能を確保することができる。 In the fifth modification, since the pile head has a flat girder shape, the assembly 12 of the pile head reinforcing member 3 having the density and structural rigidity that can efficiently secure the fixing area is configured in the narrow space of the pile head 1a. And high stress transfer performance can be ensured.

以上説明した第４実施形態の各種変形例のいずれにあっても、上記第１実施形態及び第４実施形態が奏する作用効果と同様の作用効果を奏することはもちろんである。 It goes without saying that any of the various modifications of the fourth embodiment described above will have the same effects as those of the first and fourth embodiments.

図１９から図２５には、本発明に係る杭頭補強構造の第５実施形態が示されている。第５実施形態も、中空筒状の杭、例えば鋼管杭（Ｓ杭）に適用して好ましいものである。図１９は、第５実施形態に係る杭頭補強構造の斜視図、図２０は、図１９に示した杭頭補強構造を説明する説明図であって、図２０（ａ）は平面図、図２０（ｂ）は側面図、図２０（ｃ）は図２０（ａ）中、Ｅ−Ｅ線矢視断面図、図２１は、図１９に示した杭頭補強構造に用いられる部品を説明する説明図であって、図２１（ａ）及び（ｂ）はそれぞれ杭頭補強部材の正面図、図２１（ｃ）は仕切り部材の平面図、図２２は、第５実施形態の第１変形例に係る杭頭補強構造を説明する説明図であって、図２２（ａ）は斜視図、図２２（ｂ）は、図２２（ａ）中、Ｆ−Ｆ線矢視断面図、図２３は、図２２に示した杭頭補強構造に用いられる部品の一部である杭頭補強部材の構成部品例を説明する説明図であって、図２３（ａ）は、横向き板状部分の平面視及び側面視をそれぞれ示す説明図、図２３（ｂ）は、垂下部分の平面視及び側面視をそれぞれ示す説明図、図２４は、第５実施形態の第２変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図、図２５は、第５実施形態の第３変形例に係る杭頭補強構造に適用される杭頭補強部材の組立状態の平面視及び側面視をそれぞれ示す説明図である。 19 to 25 show a fifth embodiment of the pile head reinforcing structure according to the present invention. The fifth embodiment is also preferably applied to a hollow tubular pile, for example, a steel pipe pile (S pile). 19 is a perspective view of the pile head reinforcing structure according to the fifth embodiment, FIG. 20 is an explanatory view for explaining the pile head reinforcing structure shown in FIG. 19, and FIG. 20A is a plan view and a view. 20 (b) is a side view, FIG. 20 (c) is a sectional view taken along line EE in FIG. 20 (a), and FIG. 21 describes the parts used in the pile head reinforcing structure shown in FIG. 21 (a) and 21 (b) are front views of the pile head reinforcing member, FIG. 21 (c) is a plan view of the partition member, and FIG. 22 is a first modification of the fifth embodiment. 22 (a) is a perspective view, FIG. 22 (b) is a sectional view taken along the line FF in FIG. 22 (a), and FIG. 23 is an explanatory view for explaining the pile head reinforcement structure according to the above. 23 (a) is an explanatory view for explaining a component example of the pile head reinforcing member which is a part of the parts used in the pile head reinforcing structure shown in FIG. 22, and FIG. 23 (a) is a plan view of the lateral plate-shaped portion. 23 (b) is an explanatory view showing the plan view and the side view of the hanging portion, respectively, and FIG. 24 is the pile head reinforcement structure according to the second modification of the fifth embodiment. An explanatory view showing a plan view and a side view of the assembled state of the applied pile head reinforcing member, FIG. 25 shows the pile head reinforcing member applied to the pile head reinforcing structure according to the third modification of the fifth embodiment. It is explanatory drawing which shows the plan view and the side view of the assembled state respectively.

まず、第５実施形態について、図１９〜図２１を参照して説明する。第５実施形態は、図９に示した第４実施形態と対比すると、杭頭補強部材３の横向き板状部分３ａは、中空筒状に形成された杭頭部１ａの内方に垂下される垂下部分３ｊと、垂下部分３ｊの下端に溶接接合され、杭頭部１ａ内方をその上方と下方とに仕切る鋼製板状の仕切り部材１３とを含み、垂下部分３ｊには、当該垂下部分３ｊを横向きに貫通する貫通孔３ｂ及び垂下部分３ｊの表面から突設される突出部３ｄとが設けられている。 First, the fifth embodiment will be described with reference to FIGS. 19 to 21. In the fifth embodiment, as compared with the fourth embodiment shown in FIG. 9, the lateral plate-shaped portion 3a of the pile head reinforcing member 3 is hung inward of the pile head 1a formed in a hollow tubular shape. The hanging portion 3j includes a steel plate-shaped partition member 13 welded to the lower end of the hanging portion 3j and partitioning the inside of the pile head 1a into upper and lower portions thereof, and the hanging portion 3j includes the hanging portion. A through hole 3b that laterally penetrates 3j and a protruding portion 3d that protrudes from the surface of the hanging portion 3j are provided.

垂下部分３ｊは、横向き板状部分３ｈから一体に垂下される板状の鋼製部分である。杭頭補強部材３は、上述したように例えば十字状に組んで構成されることから、杭頭部１ａ内方に垂下される垂下部分３ｊも、十字状形態で杭頭部１ａ内方に位置される。 The hanging portion 3j is a plate-shaped steel portion that is integrally hung from the lateral plate-shaped portion 3h. Since the pile head reinforcing member 3 is assembled in a cross shape as described above, the hanging portion 3j hanging inward of the pile head 1a is also positioned inward of the pile head 1a in a cross shape. Will be done.

杭頭部１ａ内方に仕切り部材１３が設けられ、仕切り部材１３の上方には、杭頭部１ａ内方に充填するコンクリートが打設される。仕切り部材１３は、杭頭部１ａの内面に溶接接合することが好ましい。すなわち、第５実施形態は、杭頭部１ａ内で垂下部分３ｊと鋼管部分とが、杭頭部１ａ内方に中詰めされる打設コンクリートによって接合されるものである。貫通孔３ｂ及び突出部３ｄの構成及び作用効果は、上記実施形態と同様である。 A partition member 13 is provided inside the pile head 1a, and concrete to be filled inside the pile head 1a is placed above the partition member 13. The partition member 13 is preferably welded to the inner surface of the pile head 1a. That is, in the fifth embodiment, the hanging portion 3j and the steel pipe portion are joined in the pile head 1a by the cast concrete filled inward in the pile head 1a. The configuration and action of the through hole 3b and the protruding portion 3d are the same as those in the above embodiment.

図２１には、部品構成が示されていて、図１１に示した場合と同様に、例えば互いに組み合わされる２つの杭頭補強部材３の一方の横向き板状部分３ｈと、他方の垂下部分３ｊの横向き方向中央には、これらを板厚方向に貫通して、下向き嵌め合わせ溝１４と上向き嵌め合わせ溝１５とが形成され、これら嵌め合わせ溝１４，１５を上下に嵌め合わせることにより、横向き板状部分３ｈと垂下部分３ｊとが嵌め合わせ構造で組み合わされて、２つの杭頭補強部材３が組み付けられる。 FIG. 21 shows a component configuration, for example, one lateral plate-shaped portion 3h of two pile head reinforcing members 3 combined with each other and the other hanging portion 3j, as in the case shown in FIG. In the center in the lateral direction, these are penetrated in the plate thickness direction to form a downward fitting groove 14 and an upward fitting groove 15, and by fitting these fitting grooves 14 and 15 up and down, a horizontal plate shape is formed. The portion 3h and the hanging portion 3j are combined in a fitting structure, and the two pile head reinforcing members 3 are assembled.

しかしながら、第４実施形態で説明したように、杭頭補強部材３を３つ以上用い、それらの横向き板状部分３ｈを杭頭部１ａ直上で放射状に配列し、６つ以上の上下方向縦向き板状部分３ａを備えるようにしても良い。 However, as described in the fourth embodiment, three or more pile head reinforcing members 3 are used, and their lateral plate-shaped portions 3h are arranged radially directly above the pile head 1a, and six or more vertically oriented vertically. The plate-shaped portion 3a may be provided.

このような場合を想定すると、杭頭補強部材３同士の組立は、上記嵌め合わせ構造に限られず、２つ以上の横向き板状部分３ｈ及び垂下部分３ｊを、杭頭部１ａの周方向に循環するように放射状に並べて、互いに溶接接合して構成される。あるいは、いずれかの横向き板状部分３ｈ及び垂下部分３ｊの板表面に、他の横向き板状部分３ｈ及び垂下部分３ｊの板端面を突き合わせて溶接接合して構成される。そして、組み立てられた垂下部分３ｊの下端に、仕切り部材１３が溶接接合される。 Assuming such a case, the assembly of the pile head reinforcing members 3 is not limited to the above-mentioned fitting structure, and two or more lateral plate-shaped portions 3h and hanging portions 3j are circulated in the circumferential direction of the pile head 1a. They are arranged in a radial pattern so as to be welded to each other. Alternatively, the plate surface of any of the lateral plate-shaped portions 3h and the hanging portion 3j is welded and joined by abutting the plate end surfaces of the other lateral plate-shaped portions 3h and the hanging portion 3j. Then, the partition member 13 is welded to the lower end of the assembled hanging portion 3j.

第５実施形態に係る杭頭補強構造の作用について説明すると、図１９に示すように、地表面Ｇから突出している杭頭部１ａ内方に向かって垂下部分３ｊを挿入しつつ、杭頭補強部材３を、横向き板状部分３ｈを介して杭頭部１ａ上に仮置き設置する。これにより、杭頭補強部材３の横向き板状部分３ｈ及び上下方向縦向き板状部分３ａが杭頭部１ａ上方に突設されると共に、垂下部分３ｊ及び仕切り部材１３が杭頭部１ａ内方に設置される。 Explaining the operation of the pile head reinforcement structure according to the fifth embodiment, as shown in FIG. 19, the pile head is reinforced while the hanging portion 3j is inserted toward the inside of the pile head 1a protruding from the ground surface G. The member 3 is temporarily placed and installed on the pile head 1a via the lateral plate-shaped portion 3h. As a result, the horizontal plate-shaped portion 3h and the vertical vertical plate-shaped portion 3a of the pile head reinforcing member 3 are projected above the pile head 1a, and the hanging portion 3j and the partition member 13 are inside the pile head 1a. Will be installed in.

次いで、基礎中に埋設する基礎鉄筋を配筋した後、これら鉄筋、杭頭補強部材３並びに杭頭部１ａを埋設するようにして、基礎を構築するコンクリートを打設する。コンクリートの一部は、杭頭部１ａの上向き頂部１ｂからその内方に充填され、仕切り部材１３上方の杭頭部１ａ内に中詰めされる。当該コンクリートによって、杭頭部１ａの鋼製部分と杭頭補強部材３、詳細には、鋼製部分と上下方向縦向き板状部分３ａとが、垂下部分３ｊ及び横向き板状部分３ｈを介して、接合される。 Next, after arranging the foundation reinforcing bars to be buried in the foundation, the concrete for constructing the foundation is placed by burying these reinforcing bars, the pile head reinforcing member 3 and the pile head 1a. A part of the concrete is filled inward from the upward top portion 1b of the pile head 1a, and is filled in the pile head 1a above the partition member 13. With the concrete, the steel portion of the pile head 1a and the pile head reinforcing member 3, specifically, the steel portion and the vertically oriented plate-shaped portion 3a via the hanging portion 3j and the horizontally oriented plate-shaped portion 3h. , Joined.

そしてまた打設されたコンクリートにより、杭頭部１ａに作用する曲げモーメントやせん断力、軸力は、杭頭補強部材３によって基礎２と杭１との間で伝達される。 Further, the bending moment, the shearing force, and the axial force acting on the pile head 1a by the cast concrete are transmitted between the foundation 2 and the pile 1 by the pile head reinforcing member 3.

第５実施形態に係る杭頭補強構造にあっては、第４実施形態の構成に加えて、横向き板状部分３ｈは、中空筒状体の杭頭部１ａの内方に垂下される垂下部分３ｊを備え、垂下部分３ｊの下端には、杭頭部１ａの内方を上下に仕切る仕切り部材１３が備えられ、さらに、垂下部分３ｊを横向きに貫通する貫通孔３ｂと、垂下部分３ｊの表面から突設される突出部３ｄとを備えているので、垂下部分３ｊ及び横向き板状部分３ｈそのもの、そしてまた垂下部分３ｊ及び横向き板状部分３ｈを介する上下方向縦向き板状部分３ａの杭頭部１ａへの接合によって、鋼製部分との応力伝達性能を向上することができる。 In the pile head reinforcement structure according to the fifth embodiment, in addition to the configuration of the fourth embodiment, the lateral plate-shaped portion 3h is a hanging portion that hangs inward of the pile head 1a of the hollow tubular body. 3j is provided, and a partition member 13 for partitioning the inside of the pile head 1a up and down is provided at the lower end of the hanging portion 3j, and further, a through hole 3b penetrating the hanging portion 3j laterally and a surface of the hanging portion 3j. Since it is provided with a projecting portion 3d projecting from, the pile head of the vertical plate-shaped portion 3a via the hanging portion 3j and the horizontal plate-shaped portion 3h itself, and also via the hanging portion 3j and the horizontal plate-shaped portion 3h. By joining to the portion 1a, the stress transfer performance with the steel portion can be improved.

垂下部分３ｊは、横向き板状部分３ｈ及び上下方向縦向き板状部分３ａに連結されるので、杭頭補強部材３自体の強度を増大することができる。施工に際しては、コンクリートによって杭頭補強部材３と鋼管部分とを接合できるので、当該接合のための溶接作業量を削減することができ、施工性を向上することができる。また、横向き板状部分３ｈを利用して杭頭補強部材３を杭頭部１ａ上に仮置きすることができて、作業性を向上することができる。 Since the hanging portion 3j is connected to the horizontal plate-shaped portion 3h and the vertical vertical plate-shaped portion 3a, the strength of the pile head reinforcing member 3 itself can be increased. At the time of construction, since the pile head reinforcing member 3 and the steel pipe portion can be joined by concrete, the amount of welding work for the joining can be reduced and the workability can be improved. Further, the pile head reinforcing member 3 can be temporarily placed on the pile head 1a by using the lateral plate-shaped portion 3h, and the workability can be improved.

垂下部分３ｊに設けられる貫通孔３ｂ及び突出部３ｄは、横向き板状部分３ｈ及び上下方向縦向き板状部分３ａに設けられる貫通孔３ｂ及び突出部３ｄと同様の作用効果を確保することができる。垂下部分３ｊにより、杭頭補強部材３を杭頭部１ａに嵌め合わせて、前後左右水平方向に位置決めをすることができる。また、杭頭補強部材３の平面上の向きを設定する場合、垂下部分３ｊを利用することで、杭頭補強部材３を杭頭部１ａ周りに回して向きを設定することができる。 The through hole 3b and the protruding portion 3d provided in the hanging portion 3j can secure the same action and effect as the through hole 3b and the protruding portion 3d provided in the horizontal plate-shaped portion 3h and the vertical vertical plate-shaped portion 3a. .. With the hanging portion 3j, the pile head reinforcing member 3 can be fitted to the pile head 1a and positioned in the front-back, left-right, and horizontal directions. Further, when setting the orientation of the pile head reinforcing member 3 on a plane, the orientation can be set by turning the pile head reinforcing member 3 around the pile head 1a by using the hanging portion 3j.

そしてこのような第５実施形態であっても、上記第１実施形態及び第４実施形態と同様の作用効果を奏することはもちろんである。 And, even in such a fifth embodiment, it goes without saying that the same effects as those in the first and fourth embodiments are exhibited.

図２２及び図２３には、第５実施形態に係る杭頭補強構造の第１変形例が示されている。第１変形例は、杭頭補強部材３の横向き板状部分３ｈを杭頭部１ａに溶接接合する場合に、有利なものである。 22 and 23 show a first modification of the pile head reinforcing structure according to the fifth embodiment. The first modification is advantageous when the lateral plate-shaped portion 3h of the pile head reinforcing member 3 is welded to the pile head 1a.

この第１変形例は、図１５に示した第４実施形態の第３変形例と対比すると、杭頭部１ａには、環状の鍔部材８が溶接接合され、この鍔部材８に杭頭補強部材３の横向き板状部分３ｈの接合面部３ｅが溶接接合される。 In comparison with the third modification of the fourth embodiment shown in FIG. 15, this first modification has an annular collar member 8 welded to the pile head 1a, and the pile head is reinforced by the flange member 8. The joint surface portion 3e of the lateral plate-shaped portion 3h of the member 3 is welded and joined.

第５実施形態では、杭頭部１ａ内方へのコンクリートの中詰めによって杭頭補強部材３を鋼製部分に接合するが、第１変形例では、溶接長を確保可能な鍔部材８を備えることにより、横向き板状部分３ｈを鋼製部分に付加的に長い溶接長で溶接することが可能で、鋼製部分と杭頭補強部材３との接合強度を高く確保することができる。また、鍔部材８によって、応力伝達作用を営む杭頭部１ａの上向き頂面１ｂ周辺の強度を増強することができ、局部的な変形を防止することができる。 In the fifth embodiment, the pile head reinforcing member 3 is joined to the steel portion by filling the pile head 1a inward with concrete, but in the first modification, the flange member 8 capable of securing the welding length is provided. As a result, the lateral plate-shaped portion 3h can be welded to the steel portion with an additionally long welding length, and a high joint strength between the steel portion and the pile head reinforcing member 3 can be ensured. Further, the flange member 8 can increase the strength around the upward top surface 1b of the pile head 1a that performs a stress transmitting action, and can prevent local deformation.

また、図２３に示すように、杭頭補強部材３の組立としては、図２１に示した嵌め込み構造ではなく、仕切り部材１３付きの垂下部分３ｊを第１部品１６とし、横向き板状部分３ｈ及び上下方向縦向き板状部分３ａを主体とするものを第２部品１７として作製し、これら部品１６，１７を後付けで接合して組立を完了するようにしても良い。 Further, as shown in FIG. 23, as the assembly of the pile head reinforcing member 3, instead of the fitting structure shown in FIG. 21, the hanging portion 3j with the partition member 13 is used as the first component 16, and the lateral plate-shaped portion 3h and the lateral plate-shaped portion 3h A second component 17 may be manufactured mainly having a vertically oriented plate-shaped portion 3a in the vertical direction, and these components 16 and 17 may be retrofitted to complete the assembly.

図２４には、第５実施形態に係る杭頭補強構造の第２変形例が示されている。第２変形例は、第４実施形態の第４変形例に対応する。第２変形例の杭頭補強部材３では、図１９に示した上記第５実施形態に対し、複数の杭頭補強部材３のうち、いずれかの杭頭補強部材３の垂下部分３ｊが省略されている。 FIG. 24 shows a second modification of the pile head reinforcing structure according to the fifth embodiment. The second modification corresponds to the fourth modification of the fourth embodiment. In the pile head reinforcing member 3 of the second modification, the hanging portion 3j of any of the pile head reinforcing members 3 is omitted from the plurality of pile head reinforcing members 3 with respect to the fifth embodiment shown in FIG. ing.

図２５には、第５実施形態に係る杭頭補強構造の第３変形例が示されている。第３変形例の杭頭補強部材３は、第４実施形態の第５変形例に対応し、図１９に示した十字形に組み合わせた第５実施形態に対し、杭芯を包囲するようにして、４つの杭頭補強部材３の横向き板状部分３ｈ及び垂下部分３ｊを平面井桁状に組んで構成されている。 FIG. 25 shows a third modification of the pile head reinforcing structure according to the fifth embodiment. The pile head reinforcing member 3 of the third modification corresponds to the fifth modification of the fourth embodiment, and surrounds the pile core with respect to the fifth embodiment combined in the cross shape shown in FIG. The four pile head reinforcing members 3 are formed by assembling the lateral plate-shaped portions 3h and the hanging portions 3j in a flat girder shape.

第３変形例では、平面井桁状であることから、杭頭部１ａの狭いスペースに、定着面積を効率よく確保できる稠密さと構造的な剛強さを備える杭頭補強部材３の組立体を構成することができ、高い応力伝達性能を確保することができる。 In the third modification, since the pile head has a flat girder shape, an assembly of the pile head reinforcing member 3 having a denseness and structural rigidity that can efficiently secure a fixing area is formed in a narrow space of the pile head 1a. It is possible to ensure high stress transfer performance.

以上説明した第５実施形態の各種変形例のいずれにあっても、上記第１実施形態、第４実施形態、並びに第５実施形態が奏する作用効果と同様の作用効果を奏することはもちろんである。 It goes without saying that any of the various modifications of the fifth embodiment described above will have the same effects as those of the first embodiment, the fourth embodiment, and the fifth embodiment. ..

上記実施形態では、突出部３ｄを上下方向縦向き板状部分３ａの片側へ突出させる場合を例示して説明したが、両側へ突出させるようにしても良いことはもちろんである。 In the above embodiment, the case where the protruding portion 3d is projected to one side of the vertically oriented plate-shaped portion 3a has been described as an example, but it is needless to say that the protruding portion 3d may be projected to both sides.

またこれら第４及び第５実施形態についても、図３に示したように、杭頭補強部材３の貫通孔３ｂに、基礎２に施工される基礎鉄筋２ａを挿通しても良いことはもちろんである。 Further, also in these 4th and 5th embodiments, as shown in FIG. 3, it goes without saying that the foundation reinforcing bar 2a to be constructed on the foundation 2 may be inserted into the through hole 3b of the pile head reinforcing member 3. is there.

１ 杭
１ａ 杭頭部
２ 基礎
３，４，５ 杭頭補強部材
３ａ，４ａ 上下方向縦向き板状部分
３ｂ 貫通孔
３ｃ 板表面
３ｄ 突出部
３ｅ 接合面部
３ｈ 横向き板状部分
３ｊ 垂下部分
５ａ 中空筒体
５ｂ 板
８ 鍔部材
９ 堰部材
１３ 仕切り部材 1 Pile 1a Pile head 2 Foundation 3, 4, 5 Pile head reinforcing member 3a, 4a Vertical vertical plate-shaped part 3b Through hole 3c Plate surface 3d Protruding part 3e Joint surface part 3h Horizontal plate-shaped part 3j Hanging part 5a Hollow cylinder Body 5b Plate 8 Pile member 9 Dam member 13 Partition member

Claims (9)

杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、
上記杭頭補強部材は、上記杭頭部に接合され、上記鋼製部分との間で応力伝達する上下方向縦向き板状部分と、該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備え、
前記杭頭補強部材の前記上下方向縦向き板状部分は、前記鋼製部分に面する接合周面部を有して、該接合周面部が該鋼製部分に溶接接合される鋼製中空筒体で形成されることを特徴とする杭頭補強構造。 In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is buried in the foundation and the lower side is provided with the steel part of the pile head so that stress can be transmitted. It is a pile head reinforcement structure with a reinforcing member,
The pile head reinforcing member is joined to the pile head and has a vertical vertical plate-shaped portion that transmits stress to and from the steel portion, and a through hole that horizontally penetrates the vertical vertical plate-shaped portion. And a protruding portion projecting from the surface of the vertically oriented plate-shaped portion in the vertical direction.
The vertical plate-shaped portion of the pile head reinforcing member has a joint peripheral surface portion facing the steel portion, and the joint peripheral surface portion is welded to the steel portion. Pile head reinforcement structure characterized by being formed in. 杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、
上記杭頭補強部材は、上記杭頭部に接合され、上記鋼製部分との間で応力伝達する上下方向縦向き板状部分と、該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備え、
前記杭頭補強部材の前記上下方向縦向き板状部分は、前記杭頭部を、間隔を隔てて包囲する鋼製中空筒体と、該杭頭部から隙間を隔てて、該鋼製中空筒体の内周面に接合して設けられる鋼製板とから構成され、
上記上下方向縦向き板状部分は、上記中空筒体内部に充填される充填材を介して、上記杭頭部に接合されることを特徴とする杭頭補強構造。 In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is buried in the foundation and the lower side is provided with the steel part of the pile head so that stress can be transmitted. It is a pile head reinforcement structure with a reinforcing member,
The pile head reinforcing member is joined to the pile head and has a vertical vertical plate-shaped portion that transmits stress to and from the steel portion, and a through hole that horizontally penetrates the vertical vertical plate-shaped portion. And a protruding portion projecting from the surface of the vertically oriented plate-shaped portion in the vertical direction.
The vertically oriented plate-shaped portion of the pile head reinforcing member includes a steel hollow cylinder that surrounds the pile head at intervals and a steel hollow cylinder that surrounds the pile head at intervals. It is composed of a steel plate that is joined to the inner peripheral surface of the body.
The pile head reinforcing structure is characterized in that the vertically oriented plate-shaped portion in the vertical direction is joined to the pile head via a filler filled inside the hollow cylinder. 前記突出部は、前記貫通孔をその周りから包囲する形態で形成されることを特徴とする請求項１または２に記載の杭頭補強構造。 The pile head reinforcing structure according to claim 1 or 2, wherein the protruding portion is formed so as to surround the through hole from the periphery thereof. 杭と基礎との間で杭頭部に作用する力を伝達するために、該基礎中に上部側が埋設されると共に、下部側が該杭頭部の鋼製部分と応力伝達可能に設けられる杭頭補強部材を有する杭頭補強構造であって、
前記杭頭補強部材は、前記杭頭部の直上を横向き方向に跨ぐ横向き板状部分を備え、
該横向き板状部分は、上記杭頭部を挟んで当該杭頭部の両側に配置される上下方向縦向き板状部分を連結し、
上記杭頭補強部材は、上記杭頭部の前記鋼製部分との間で応力伝達するために、少なくとも該上下方向縦向き板状部分及び上記横向き板状部分のいずれかが該杭頭部に接合されると共に、
該上下方向縦向き板状部分を横向きに貫通する貫通孔と、上記上下方向縦向き板状部分の表面から突設される突出部とを備えることを特徴とする杭頭補強構造。 In order to transmit the force acting on the pile head between the pile and the foundation, the upper side is buried in the foundation and the lower side is provided with the steel part of the pile head so that stress can be transmitted. It is a pile head reinforcement structure with a reinforcing member,
The pile head reinforcing member includes a lateral plate-shaped portion that straddles directly above the pile head in the lateral direction.
The horizontal plate- shaped portion connects the vertical vertical plate-shaped portions arranged on both sides of the pile head with the pile head in between.
In order to transmit stress between the pile head reinforcing member and the steel portion of the pile head, at least one of the vertically oriented plate-shaped portion and the horizontally oriented plate-shaped portion is sent to the pile head. As well as being joined
A pile head reinforcing structure including a through hole that horizontally penetrates the vertically oriented plate-shaped portion and a protruding portion that protrudes from the surface of the vertically oriented vertically oriented plate-shaped portion. 前記突出部は、前記貫通孔をその周りから包囲する形態で形成されることを特徴とする請求項４に記載の杭頭補強構造。 The pile head reinforcing structure according to claim 4, wherein the protruding portion is formed so as to surround the through hole from the periphery thereof. 前記横向き板状部分を横向きに貫通する貫通孔と、該横向き板状部分の表面から突設される突出部とを備えることを特徴とする請求項４または５に記載の杭頭補強構造。 The pile head reinforcing structure according to claim 4 or 5, further comprising a through hole that laterally penetrates the lateral plate-shaped portion and a protruding portion that protrudes from the surface of the lateral plate-shaped portion. 前記杭頭部には、その周方向に沿って環状の鋼製鍔部が形成され、該鍔部に前記杭頭補強部材が接合されることを特徴とする請求項４〜６いずれかの項に記載の杭頭補強構造。 Any of claims 4 to 6, wherein an annular steel collar portion is formed on the pile head along the circumferential direction, and the pile head reinforcing member is joined to the collar portion. Pile head reinforcement structure described in. 前記杭頭部は中空筒状に形成され、前記横向き板状部分は、基礎を構築するコンクリートを堰き止めるための堰部材を備えることを特徴とする請求項４〜７いずれかの項に記載の杭頭補強構造。 The item according to any one of claims 4 to 7, wherein the pile head is formed in a hollow tubular shape, and the lateral plate-shaped portion is provided with a weir member for damming the concrete forming the foundation. Pile head reinforcement structure. 前記杭頭部は中空筒状に形成され、前記横向き板状部分は、上記杭頭部の内方に垂下される垂下部分を備え、該垂下部分の下端には、杭頭部の内方を上下に仕切る仕切り部材が備えられ、さらに、上記垂下部分を横向きに貫通する貫通孔と、該垂下部分の表面から突設される突出部とを備えることを特徴とする請求項４〜８いずれかの項に記載の杭頭補強構造。 The pile head is formed in a hollow tubular shape, and the lateral plate-shaped portion includes a hanging portion that hangs inward of the pile head, and the inside of the pile head is provided at the lower end of the hanging portion. 4. Pile head reinforcement structure described in the section.
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