JP2022077829A - Reinforcement cage and construction method of concrete structure - Google Patents

Reinforcement cage and construction method of concrete structure Download PDF

Info

Publication number
JP2022077829A
JP2022077829A JP2020188859A JP2020188859A JP2022077829A JP 2022077829 A JP2022077829 A JP 2022077829A JP 2020188859 A JP2020188859 A JP 2020188859A JP 2020188859 A JP2020188859 A JP 2020188859A JP 2022077829 A JP2022077829 A JP 2022077829A
Authority
JP
Japan
Prior art keywords
reinforcing bar
bar cage
diameter
strands
expanded
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
JP2020188859A
Other languages
Japanese (ja)
Other versions
JP7422055B2 (en
Inventor
慎一 山野辺
Shinichi Yamanobe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Kajima Corp
Original Assignee
Kajima Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Kajima Corp filed Critical Kajima Corp
Priority to JP2020188859A priority Critical patent/JP7422055B2/en
Publication of JP2022077829A publication Critical patent/JP2022077829A/en
Application granted granted Critical
Publication of JP7422055B2 publication Critical patent/JP7422055B2/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Reinforcement Elements For Buildings (AREA)
  • Piles And Underground Anchors (AREA)

Abstract

To provide a reinforcement cage capable of extending/contracting vertically and changing a diameter thereof.SOLUTION: A reinforcement cage 1 has a plurality of flexible spiral strands 11a, 11b arranged in a circumferential direction of the reinforcement cage 1 leaving an interval, the strands being disposed inside and outside with varying directions of spiraling, and the outer and inner strands 11a, 11b are connected rotatably at an intersection. The reinforcement cage 1 realizes extended and contracted states by changing an angle of intersection between the inner and outer strands 11a, 11b, and furthermore the reinforcement cage 1 is capable of changing a diameter to a small diameter in the extended state and to a wide diameter in the contracted state of the reinforcement cage 1.SELECTED DRAWING: Figure 2

Description

本発明は、鉄筋籠とこれを用いたコンクリート構造物の構築方法に関する。 The present invention relates to a reinforcing bar cage and a method for constructing a concrete structure using the same.

地盤に形成した立坑内にコンクリート基礎を構築する際、上下に伸縮可能な鉄筋籠を用いることがある（例えば、特許文献１、２等）。 When constructing a concrete foundation in a shaft formed on the ground, a reinforcing bar cage that can be expanded and contracted up and down may be used (for example, Patent Documents 1, 2, etc.).

この鉄筋籠は、PC鋼線等を用いた可とう性を有するストランドを軸方向鋼材として用い、鉄筋籠の周方向に間隔を空けて設けた複数のストランドを、上下複数段に配置した帯筋に回転可能に接合したものである。これらストランドと帯筋の交差角を変えることで上下の帯筋の間隔を増減させ、鉄筋籠を上下に伸縮させることができる。 This reinforcing bar cage uses flexible strands made of PC steel wire or the like as an axial steel material, and a plurality of strands provided at intervals in the circumferential direction of the reinforcing bar cage are arranged in multiple stages above and below. It is rotatably joined to. By changing the crossing angle between these strands and the reinforcing bars, the distance between the upper and lower reinforcing bars can be increased or decreased, and the reinforcing bar cage can be expanded and contracted up and down.

特開2008－214990号公報Japanese Unexamined Patent Publication No. 2008-214990 特開2018－172870号公報Japanese Unexamined Patent Publication No. 2018-172870

コンクリート基礎の構築時には、しばしば鉄筋籠の径を変えたいということがある。例えば基礎に拡幅部を設けるときに、その拡幅部に配筋したい、あるいは、共通の鉄筋籠を基礎の大きさに合わせて径を変えて使用したい等である。しかしながら、上下に伸縮可能な従来の鉄筋籠について、さらに径を変えることのできるものは無かった。 When constructing concrete foundations, it is often desirable to change the diameter of the rebar cage. For example, when a widening portion is provided on a foundation, it is desired to arrange reinforcement in the widening portion, or to use a common reinforcing bar cage with a different diameter according to the size of the foundation. However, none of the conventional rebar cages that can be expanded and contracted up and down can be further changed in diameter.

本発明は上記の問題に鑑みてなされたものであり、上下に伸縮可能であり、且つ径を変えることのできる鉄筋籠等を提供することを目的とする。 The present invention has been made in view of the above problems, and an object of the present invention is to provide a reinforcing bar cage or the like which can be expanded and contracted up and down and whose diameter can be changed.

前述した課題を解決するための第１の発明は、上下に伸縮可能な鉄筋籠であって、鉄筋籠の周方向に間隔を空けて配置された可とう性を有する複数本の螺旋状の軸方向鋼材が、旋回方向を変えて内外に設けられ、内外の軸方向鋼材が交差部で回転可能に接合されたことを特徴とする鉄筋籠である。 The first invention for solving the above-mentioned problems is a reinforcing bar cage that can be expanded and contracted up and down, and a plurality of flexible spiral shafts arranged at intervals in the circumferential direction of the reinforcing bar cage. It is a reinforcing bar cage characterized in that directional steel materials are provided inside and outside by changing the turning direction, and the inside and outside axial steel materials are rotatably joined at an intersection.

本発明の鉄筋籠は、可とう性を有する螺旋状の軸方向鋼材を旋回方向を変えて内外に配置し、交差部で回転可能に接合したものであり、内外の軸方向鋼材の交差角が変化することにより、伸長状態と収縮状態とを実現できる。さらに、鉄筋籠は伸長状態で細径、収縮状態で広径となり、鉄筋籠の径を変えることができる。 In the reinforcing bar cage of the present invention, a spiral axial steel material having flexibility is arranged inside and outside by changing the turning direction, and rotatably joined at the intersection, and the intersection angle of the inside and outside axial steel materials is set. By changing, an extended state and a contracted state can be realized. Further, the reinforcing bar cage has a small diameter in the extended state and a wide diameter in the contracted state, and the diameter of the reinforcing bar cage can be changed.

前記鉄筋籠を拡径させるための拡径用治具が前記鉄筋籠の下端部に設けられることが望ましい。前記拡径用治具は、前記軸方向鋼材の下端部が取り付けられた取付部と、前記取付部の下方に設けられた先端部と、前記取付部と前記先端部に両端部を取り付けて放射状に複数本配置されたアームと、を有し、前記アームは、前記先端部を通る鉛直面において回転可能に前記先端部と前記取付部に取り付けられることが望ましい。
上記の拡径用治具を用いることにより、鉄筋籠の下端部を確実に拡径させることができる。また拡径用治具を上記の取付部、先端部、アーム等から成る構成とすることで、簡易な構成の拡径用治具を用いて鉄筋籠を拡径することができる。 It is desirable that a diameter-expanding jig for expanding the diameter of the reinforcing bar cage is provided at the lower end portion of the reinforcing bar cage. The diameter-expanding jig has a mounting portion to which the lower end portion of the axial steel material is attached, a tip portion provided below the mounting portion, and both ends attached to the mounting portion and the tip portion in a radial pattern. It is desirable to have a plurality of arms arranged in the above, and the arm is rotatably attached to the tip portion and the mounting portion in a vertical plane passing through the tip portion.
By using the above-mentioned diameter-expanding jig, the diameter of the lower end of the reinforcing bar cage can be reliably expanded. Further, by configuring the diameter-expanding jig to include the above-mentioned mounting portion, tip portion, arm, and the like, the diameter of the reinforcing bar cage can be expanded by using the diameter-expanding jig having a simple configuration.

内側の前記軸方向鋼材と外側の前記軸方向鋼材とが前記鉄筋籠の下端部において連続していることも望ましい。
この場合、鉄筋籠の下端部を押し付けることで、鉄筋籠の下端部を拡径することができる。また軸方向鋼材の連続部分により、鉄筋籠の下端部をコンクリート構造物の底部に確実に定着できる。 It is also desirable that the inner axial steel material and the outer axial steel material are continuous at the lower end of the reinforcing bar cage.
In this case, the diameter of the lower end of the reinforcing bar cage can be expanded by pressing the lower end portion of the reinforcing bar cage. In addition, the continuous portion of the axial steel material ensures that the lower end of the reinforcing bar cage is firmly fixed to the bottom of the concrete structure.

前記鉄筋籠の径を拘束するための拘束リングが設けられることも望ましい。
これにより、鉄筋籠の拡径部分を必要な部分に限定できる。 It is also desirable to provide a restraint ring for restraining the diameter of the reinforcing bar cage.
As a result, the enlarged diameter portion of the reinforcing bar cage can be limited to the required portion.

第２の発明は、第１の発明の鉄筋籠を、底部に拡幅部を有する立坑内に伸長した状態で建て込み、前記鉄筋籠の下端部を拡径させてその拡径部分を前記拡幅部に配置し、前記立坑にコンクリートを打設することを特徴とするコンクリート構造物の構築方法である。 In the second invention, the reinforcing bar cage of the first invention is built in a state of being extended in a shaft having a widening portion at the bottom, the lower end portion of the reinforcing bar cage is expanded in diameter, and the expanded portion is the widened portion. It is a method of constructing a concrete structure characterized by arranging the concrete in the shaft and placing concrete in the shaft.

本発明により、上下に伸縮可能であり、且つ径を変えることのできる鉄筋籠等を提供することができる。 INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide a reinforcing bar cage or the like that can be expanded and contracted up and down and whose diameter can be changed.

基礎１００を示す図。The figure which shows the foundation 100. 鉄筋籠１を示す図。The figure which shows the reinforcing bar cage 1. 基礎１００の構築方法について説明する図。The figure explaining the construction method of the foundation 100. 拡径用治具１４、１４ａを示す図。The figure which shows the diameter expansion jig 14, 14a. 内外のストランド１１ａ、１１ｂの接合部１６の例。An example of the joint portion 16 of the inner and outer strands 11a and 11b. 内外のストランド１１ａ、１１ｂの螺旋半径の変化を示す図。The figure which shows the change of the spiral radius of the inner and outer strands 11a and 11b. 内外のストランド１１ａ、１１ｂの別の接合部１１０、１１０ａ、１１０ａ’の例。An example of another joint 110, 110a, 110a'of inner and outer strands 11a, 11b. 内外のストランド１１ａ、１１ｂの下端部同士が連続する例。An example in which the lower ends of the inner and outer strands 11a and 11b are continuous.

以下、図面に基づいて本発明の好適な実施形態について詳細に説明する。 Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

（１．基礎１００）
図１は、本発明の実施形態に係る鉄筋籠１を含むコンクリート構造物である基礎１００を示す図である。基礎１００は例えば鉄塔深礎であるが、これに限ることはない。 (1. Basic 100)
FIG. 1 is a diagram showing a foundation 100 which is a concrete structure including a reinforcing bar cage 1 according to an embodiment of the present invention. The foundation 100 is, for example, a deep foundation of a steel tower, but is not limited to this.

基礎１００は、地盤２に形成した立坑３内にコンクリートを打設して構築され、コンクリートの内部に鉄筋籠１が埋設される。 The foundation 100 is constructed by placing concrete in a shaft 3 formed in the ground 2, and a reinforcing bar cage 1 is buried inside the concrete.

基礎１００の下端部には拡幅部１０１が設けられ、鉄筋籠１の下端部には拡径用治具１４が設けられる。鉄筋籠１は、拡径用治具１４により拡幅部１０１に当たる部分で拡径し、拡径部分が拡幅部１０１内に埋設される。鉄筋籠１の拡径部分の上端には拘束リング１３が設けられ、拘束リング１３の上では鉄筋籠１が一定の径となっている。 A widening portion 101 is provided at the lower end of the foundation 100, and a diameter-expanding jig 14 is provided at the lower end of the reinforcing bar cage 1. The reinforcing bar cage 1 is expanded in a portion corresponding to the widening portion 101 by the diameter expanding jig 14, and the enlarged diameter portion is embedded in the widening portion 101. A restraint ring 13 is provided at the upper end of the enlarged diameter portion of the reinforcing bar cage 1, and the reinforcing bar cage 1 has a constant diameter on the restraint ring 13.

（２．鉄筋籠１）
図２は鉄筋籠１を示す図である。鉄筋籠１は上下に伸縮可能であり、図２（ａ）は鉄筋籠１が完全に伸びた状態、（ｃ）は鉄筋籠１を完全に縮小させた状態、（ｂ）はその中間の状態を示している。 (2. Reinforcing bar cage 1)
FIG. 2 is a diagram showing a reinforcing bar cage 1. The reinforcing bar cage 1 can be expanded and contracted up and down, FIG. 2 (a) shows a state in which the reinforcing bar cage 1 is completely extended, (c) is a state in which the reinforcing bar cage 1 is completely contracted, and (b) is an intermediate state. Is shown.

鉄筋籠１は、鉄筋籠１の周方向に間隔を空けて配置された複数本の外側ストランド１１ａと、同じく鉄筋籠１の周方向に間隔を空けて配置された複数本の内側ストランド１１ｂとを有する。外側ストランド１１ａと内側ストランド１１ｂは鉄筋籠１の軸方向鋼材であり、螺旋状に配置される。 The reinforcing bar cage 1 includes a plurality of outer strands 11a arranged at intervals in the circumferential direction of the reinforcing bar cage 1 and a plurality of inner strands 11b also arranged at intervals in the circumferential direction of the reinforcing bar cage 1. Have. The outer strand 11a and the inner strand 11b are axial steel materials of the reinforcing bar cage 1, and are arranged in a spiral shape.

外側ストランド１１ａと内側ストランド１１ｂの旋回方向は異なっており、本実施形態では、外側ストランド１１ａが下から上に行くに従って時計回りの方向に回転するのに対し、内側ストランド１１ｂは下から上に行くに従って反時計回りの方向に回転する。内外のストランド１１ａ、１１ｂは、その交差部において回転可能に接合される。なお、内外のストランド１１ａ、１１ｂは、全ての交差部において回転可能に接合される必要は無く、回転可能に接合される交差部を一部の交差部に限定することも可能である。 The turning directions of the outer strand 11a and the inner strand 11b are different, and in the present embodiment, the outer strand 11a rotates in the clockwise direction from the bottom to the top, whereas the inner strand 11b goes from the bottom to the top. It rotates in the counterclockwise direction according to. The inner and outer strands 11a and 11b are rotatably joined at the intersection thereof. The inner and outer strands 11a and 11b do not have to be rotatably joined at all the intersections, and the rotatably joined intersections can be limited to some intersections.

ストランド１１ａ、１１ｂは複数本のPC鋼線を撚り合わせたものであり、可とう性を有する。図２（ａ）～（ｃ）に示すように、ストランド１１ａ、１１ｂの交差角を変化させることで、鉄筋籠１の全長を伸縮することができる。図２（ｃ）に示すように鉄筋籠１の全長を収縮させれば鉄筋籠１が広径となり、図２（ａ）に示すように鉄筋籠１を伸長させれば鉄筋籠１は細径となる。 Strands 11a and 11b are made by twisting a plurality of PC steel wires and have flexibility. As shown in FIGS. 2A to 2C, the total length of the reinforcing bar cage 1 can be expanded or contracted by changing the crossing angles of the strands 11a and 11b. As shown in FIG. 2 (c), if the total length of the reinforcing bar cage 1 is contracted, the reinforcing bar cage 1 has a wide diameter, and if the reinforcing bar cage 1 is extended as shown in FIG. 2 (a), the reinforcing bar cage 1 has a small diameter. Will be.

（３．基礎１００の構築方法）
次に、図３等を参照して鉄筋籠１を用いた基礎１００の構築方法について説明する。 (3. Construction method of foundation 100)
Next, a method of constructing the foundation 100 using the reinforcing bar cage 1 will be described with reference to FIG. 3 and the like.

図３（ａ）に示すように、本実施形態ではまず地盤２に立坑３を形成する。立坑３の底部には拡幅部３１が形成される。 As shown in FIG. 3A, in the present embodiment, the shaft 3 is first formed on the ground 2. A widening portion 31 is formed at the bottom of the shaft 3.

その後、鉄筋籠１を収縮した状態で施工現場まで搬送し、鉄筋籠１を伸長してその径を立坑３の径に合わせ、図３（ｂ）に示すように鉄筋籠１を立坑３に建て込む。 After that, the reinforcing bar cage 1 is transported to the construction site in a contracted state, the reinforcing bar cage 1 is extended to match the diameter with the diameter of the shaft 3, and the reinforcing bar cage 1 is built in the shaft 3 as shown in FIG. 3 (b). Include.

ここで、伸長後の鉄筋籠１には、拘束リング１３と拡径用治具１４が取り付けられる。拘束リング１３は鉄筋籠１の高さ方向の中間部で鉄筋籠１を囲むように設けられ、拡径用治具１４は鉄筋籠１の下端部に設けられる。 Here, the restraint ring 13 and the diameter-expanding jig 14 are attached to the rebar cage 1 after the extension. The restraint ring 13 is provided so as to surround the reinforcing bar cage 1 at the middle portion in the height direction of the reinforcing bar cage 1, and the diameter-expanding jig 14 is provided at the lower end portion of the reinforcing bar cage 1.

拡径用治具１４は、鉄筋籠１の拡径に用いるものである。図４（ａ）は拡径用治具１４を示す図である。図に示すように、拡径用治具１４は、リング材１４１、先端部１４２、アーム１４３、取付部１４４等を有する。 The diameter-expanding jig 14 is used for expanding the diameter of the reinforcing bar cage 1. FIG. 4A is a diagram showing a diameter-expanding jig 14. As shown in the figure, the diameter-expanding jig 14 has a ring material 141, a tip portion 142, an arm 143, a mounting portion 144, and the like.

リング材１４１は、鉄筋籠１の下端部で鉄筋籠１の周方向に配置される。リング材１４１は、鉄筋籠１の拡径状態の周長より長い線状部材を、少なくとも一部が重なるようにリング状に配置したものである。重複部分の長さが変わることで、リング材１４１の径が変化する。あるいはリング材１４１に伸縮可能な線状部材を用い、当該線状部材が伸縮することでリング材１４１の径が変化するようにしてもよい。 The ring material 141 is arranged at the lower end of the reinforcing bar cage 1 in the circumferential direction of the reinforcing bar cage 1. The ring material 141 is formed by arranging linear members having a diameter longer than the peripheral length of the reinforcing bar cage 1 in a ring shape so that at least a part thereof overlaps. By changing the length of the overlapping portion, the diameter of the ring material 141 changes. Alternatively, a stretchable linear member may be used for the ring material 141 so that the diameter of the ring material 141 changes as the linear member expands and contracts.

取付部１４４は筒状の部材であり、その内部にリング材１４１が通される。取付部１４４には外側ストランド１１ａと内側ストランド１１ｂの下端部が取り付けられる。 The mounting portion 144 is a cylindrical member through which the ring material 141 is passed. The lower ends of the outer strand 11a and the inner strand 11b are attached to the attachment portion 144.

また取付部１４４には、アーム１４３の上端部が取り付けられる。アーム１４３の下端部は、先端部１４２に取り付けられる。先端部１４２は、取付部１４４の下方に配置される。アーム１４３は、先端部１４２および取付部１４４に対し、当該先端部１４２を通る鉛直面内で回転可能に接続され、先端部１４２を中心として放射状に複数本配置される。 Further, the upper end portion of the arm 143 is attached to the attachment portion 144. The lower end of the arm 143 is attached to the tip 142. The tip portion 142 is arranged below the mounting portion 144. A plurality of arms 143 are rotatably connected to the tip portion 142 and the mounting portion 144 in a vertical plane passing through the tip portion 142, and a plurality of arms 143 are radially arranged around the tip portion 142.

図４（ａ）に示すように、拡径用治具１４の先端部１４２を立坑３の底面に接触させ、この状態から更に鉄筋籠１を下降させると、図４（ｂ）に示すように拡径用治具１４のアーム１４３が外側に広がるように回転する。これによりリング材１４１の径が広がり、鉄筋籠１の下端部の径が広がる。 As shown in FIG. 4A, when the tip 142 of the diameter expansion jig 14 is brought into contact with the bottom surface of the shaft 3 and the reinforcing bar cage 1 is further lowered from this state, as shown in FIG. 4B. The arm 143 of the diameter-expanding jig 14 rotates so as to spread outward. As a result, the diameter of the ring material 141 is widened, and the diameter of the lower end portion of the reinforcing bar cage 1 is widened.

その他、図４（ｃ）の拡径用治具１４ａに示すように、リング材１４１を省略してもよい。この拡径用治具１４ａは、アーム１４３ａの両端部をいわゆるフォークエンド状に加工し、それぞれ先端部１４２ａと取付部１４４ａに取り付けたものである。 In addition, as shown in the diameter expansion jig 14a of FIG. 4C, the ring material 141 may be omitted. In this diameter expansion jig 14a, both ends of the arm 143a are processed into a so-called fork end shape and attached to the tip portion 142a and the mounting portion 144a, respectively.

先端部１４２ａは、アーム１４３ａの数に対応する複数の鉛直方向の板材１４２１を、放射状に結合したものである。取付部１４４ａは、鉛直板１４４１から鉛直方向の突出板１４４２が内側に突出するように、鉛直板１４４１と突出板１４４２を直交させて組み合わせたものである。ストランド１１ａ、１１ｂの下端部は鋼管１５１に挿入されて樹脂により鋼管１５１に固定され、当該鋼管１５１に取付板１５２が取付けられる。 The tip portion 142a is formed by radially connecting a plurality of vertical plate members 1421 corresponding to the number of arms 143a. The mounting portion 144a is a combination of the vertical plate 1441 and the protruding plate 1442 at right angles so that the protruding plate 1442 in the vertical direction protrudes inward from the vertical plate 1441. The lower ends of the strands 11a and 11b are inserted into the steel pipe 151 and fixed to the steel pipe 151 with resin, and the mounting plate 152 is attached to the steel pipe 151.

ストランド１１ａ、１１ｂの下端部の取付板１５２は、取付部１４４ａの鉛直板１４４１の両面に配置され、ボルト等により鉛直板１４４１と回転可能に接合される。またアーム１４３ａの両端部は、ボルト等により先端部１４２ａの板材１４２１、取付部１４４ａの突出板１４４２と回転可能に結合される。なお図４（ｃ）ではアーム１４３ａ、取付部１４４ａをそれぞれ１個のみ図示している。 The mounting plates 152 at the lower ends of the strands 11a and 11b are arranged on both sides of the vertical plate 1441 of the mounting portion 144a, and are rotatably joined to the vertical plate 1441 by bolts or the like. Further, both ends of the arm 143a are rotatably coupled to the plate member 1421 of the tip portion 142a and the protruding plate 1442 of the mounting portion 144a by bolts or the like. In FIG. 4C, only one arm 143a and one mounting portion 144a are shown.

鉄筋籠１の下端部の径が広がった状態を示したものが、図３（ｃ）である。鉄筋籠１の中間部の拘束リング１３は、鉄筋籠１の下端部を拡径した時に立坑３の拡幅部３１の上端に当たる位置に配置され、拘束リング１３で鉄筋籠１の径が拘束されることで、鉄筋籠１の径は立坑３の拡幅部３１に当たる位置でのみ広がる。拘束リング１３の上方では鉄筋籠１の径が元のまま一定であり、鉄筋籠１が拡径して孔壁に接触することはない。 FIG. 3C shows a state in which the diameter of the lower end portion of the reinforcing bar cage 1 is widened. The restraint ring 13 at the intermediate portion of the reinforcing bar cage 1 is arranged at a position corresponding to the upper end of the widening portion 31 of the shaft 3 when the lower end portion of the reinforcing bar cage 1 is expanded in diameter, and the diameter of the reinforcing bar cage 1 is constrained by the restraint ring 13. Therefore, the diameter of the reinforcing bar cage 1 expands only at the position corresponding to the widening portion 31 of the shaft 3. Above the restraint ring 13, the diameter of the reinforcing bar cage 1 remains constant, and the diameter of the reinforcing bar cage 1 does not expand and come into contact with the hole wall.

こうして立坑３内に鉄筋籠１を配置した後、立坑３内にコンクリートを打設することで、図１で説明した基礎１００が構築される。本実施形態では、基礎１００の拡幅部１０１に鉄筋籠１の拡径部分が埋設されることで、基礎１００に引揚力が加わった時に、引揚力が鉄筋籠１の下端部の定着部分から拡幅部１０１の上面に好適に伝達され、拡幅部１０１の上方の地盤２により引揚力に抵抗できる。 After arranging the reinforcing bar cage 1 in the shaft 3 in this way, concrete is placed in the shaft 3 to construct the foundation 100 described with reference to FIG. In the present embodiment, the enlarged diameter portion of the reinforcing bar cage 1 is embedded in the widening portion 101 of the foundation 100, so that when the lifting force is applied to the foundation 100, the lifting force is widened from the fixing portion of the lower end portion of the reinforcing bar cage 1. It is suitably transmitted to the upper surface of the portion 101, and can resist the pulling force by the ground 2 above the widening portion 101.

以上説明したように、本実施形態の鉄筋籠１は、可とう性を有する螺旋状のストランド１１ａ、１１ｂを旋回方向を変えて内外に配置し、交差部で回転可能に接合したものであり、内外のストランド１１ａ、１１ｂの交差角が変化することにより、伸長状態と収縮状態とを実現できる。さらに、鉄筋籠１は伸長状態で細径、収縮状態で広径となり、鉄筋籠１の径を変えることができる。 As described above, in the reinforcing bar cage 1 of the present embodiment, the flexible spiral strands 11a and 11b are arranged inside and outside by changing the turning direction, and are rotatably joined at the intersection. By changing the crossing angle of the inner and outer strands 11a and 11b, an extended state and a contracted state can be realized. Further, the reinforcing bar cage 1 has a small diameter in the extended state and a wide diameter in the contracted state, and the diameter of the reinforcing bar cage 1 can be changed.

また本実施形態では、拡径用治具１４を用いることにより、鉄筋籠１の下端部を確実に拡径させることができる。拡径用治具１４を前記の先端部１４２、アーム１４３、取付部１４４等から成る構成とすることで、簡易な構成の拡径用治具１４を用いて鉄筋籠１を拡径することができる。ただし、拡径用治具１４の構成は、鉄筋籠１の下端部を拡径できれば特に限定されない。 Further, in the present embodiment, by using the diameter-expanding jig 14, the lower end portion of the reinforcing bar cage 1 can be reliably expanded in diameter. By configuring the diameter-expanding jig 14 to include the tip portion 142, the arm 143, the mounting portion 144, and the like, the diameter of the reinforcing bar cage 1 can be expanded by using the diameter-expanding jig 14 having a simple configuration. can. However, the configuration of the diameter-expanding jig 14 is not particularly limited as long as the lower end portion of the reinforcing bar cage 1 can be expanded in diameter.

また本実施形態では、鉄筋籠１が拘束リング１３を有していることで、鉄筋籠１の拡径部分を必要な部分に限定できる。 Further, in the present embodiment, since the reinforcing bar cage 1 has the restraint ring 13, the enlarged diameter portion of the reinforcing bar cage 1 can be limited to a necessary portion.

しかしながら、本発明が上記の実施形態に限られることはない。例えば本実施形態ではコンクリート構造物として基礎１００を構築する例を説明したが、本発明はその他の構造物、例えば筒状構造物を立坑３内に構築する際にも適用可能である。 However, the present invention is not limited to the above embodiment. For example, in the present embodiment, an example of constructing the foundation 100 as a concrete structure has been described, but the present invention can also be applied when constructing another structure, for example, a tubular structure in the shaft 3.

また、本発明で用いる内外のストランド１１ａ、１１ｂは、旋回方向が逆向きの螺旋を描くものである。内外のストランド１１ａ、１１ｂの交差部では、ストランド１１ａ、１１ｂが回転可能に接合されるが、この接合部には、例えば図５（ａ）に示す接合部１６を用いることができる。図５（ａ）は、接合部１６を、ストランド１１ａ、１１ｂの軸方向と直交する断面において示す図である。 Further, the inner and outer strands 11a and 11b used in the present invention draw a spiral in which the turning direction is opposite. At the intersection of the inner and outer strands 11a and 11b, the strands 11a and 11b are rotatably joined, and for this joining portion, for example, the joining portion 16 shown in FIG. 5A can be used. FIG. 5A is a diagram showing the joint portion 16 in a cross section orthogonal to the axial direction of the strands 11a and 11b.

接合部１６は、小金具部１６１、１６２による組を一対設け、２組の小金具部１６１、１６２のそれぞれでストランド１１ａ、１１ｂを保持し、各組の小金具部１６１同士を軸材１６７で回転可能に接合したものである。各組の小金具部１６１同士、小金具部１６２同士はそれぞれ同じ形状となっている。 The joint portion 16 is provided with a pair of small metal fittings portions 161 and 162, and the strands 11a and 11b are held by the two sets of small metal fittings portions 161 and 162, respectively, and the small metal fitting portions 161 of each set are connected to each other by the shaft member 167. It is rotatably joined. The small metal fittings 161 and the small metal fittings 162 of each set have the same shape.

小金具部１６１は、曲面部の一端に平板部を設けた断面を有し、当該平板部には長孔１６５が形成される。曲面部の他端は、図５（ｂ）に示すように曲面部の外側へと折返された折返し部１６４となっている。曲面部の途中には、曲面部の外側へと突出する筒状部１６３が設けられる。 The small metal fitting portion 161 has a cross section in which a flat plate portion is provided at one end of the curved surface portion, and an elongated hole 165 is formed in the flat plate portion. The other end of the curved surface portion is a folded-back portion 164 folded outward of the curved surface portion as shown in FIG. 5 (b). In the middle of the curved surface portion, a cylindrical portion 163 projecting to the outside of the curved surface portion is provided.

小金具部１６２も、小金具部１６１と同じく曲面部の一端に平板部を設けた断面を有する。当該平板部には、小金具部１６１の反対側に突出する筒状の突出部１６６が設けられ、突出部１６６の内面にはネジが形成される。頭付きボルト１７の軸部を小金具部１６１の平板部の長孔１６５から突出部１６６の内部に通し、当該軸部を突出部１６６の内面のネジに螺合させることで、小金具部１６１、１６２の平板部同士が接合される。 The small metal fitting portion 162 also has a cross section in which a flat plate portion is provided at one end of the curved surface portion like the small metal fitting portion 161. The flat plate portion is provided with a cylindrical projecting portion 166 projecting on the opposite side of the small metal fitting portion 161, and a screw is formed on the inner surface of the projecting portion 166. By passing the shaft portion of the headed bolt 17 from the elongated hole 165 of the flat plate portion of the small metal fitting portion 161 into the inside of the protruding portion 166 and screwing the shaft portion into the screw on the inner surface of the protruding portion 166, the small metal fitting portion 161 , 162 flat plates are joined to each other.

一方、小金具部１６２の曲面部の他端は、図５（ｂ）に示すようにＴ字状となっている。前記した折返し部１６４は、小金具部１６１の幅方向（図５（ａ）の法線方向に対応する）の両側に一対形成されており、Ｔ字の横辺部分がこれらの折返し部１６４の内側に配置されることで、小金具部１６１、１６２の他端同士が係合する。 On the other hand, the other end of the curved surface portion of the small metal fitting portion 162 is T-shaped as shown in FIG. 5 (b). The folded portions 164 are formed in pairs on both sides of the small metal fitting portion 161 in the width direction (corresponding to the normal direction in FIG. 5A), and the side portions of the T-shape are formed in the folded portions 164. By being arranged inside, the other ends of the small metal fittings portions 161 and 162 are engaged with each other.

小金具部１６１、１６２の曲面部は筒状空間を形成し、ストランド１１ａ、１１ｂは当該筒状空間に通して保持される。前記の長孔１６５は、当該筒状空間の軸方向（図５（ａ）の法線方向に対応する）と直交する方向に形成される。 The curved surface portions of the small metal fitting portions 161 and 162 form a tubular space, and the strands 11a and 11b are held through the tubular space. The elongated hole 165 is formed in a direction orthogonal to the axial direction of the tubular space (corresponding to the normal direction in FIG. 5A).

各組の小金具部１６１同士は、筒状部１６３の位置を合わせて配置される。筒状部１６３の先端は筒状部１６３の内側に折り返され、各組の小金具部１６１同士は、この先端同士が接するように配置される。前記の軸材１６７はこれらの筒状部１６３の内部に配置される。軸材１６７の両端部は軸材１６７の外側へとフランジ状に張出しており、この張出部分が各筒状部１６３の先端の折返し部分に係合することで、軸材１６７が筒状部１６３から外れないようになっている。 The small metal fitting portions 161 of each set are arranged so that the positions of the cylindrical portions 163 are aligned with each other. The tip of the tubular portion 163 is folded back inside the tubular portion 163, and the small metal fitting portions 161 of each set are arranged so that the tips are in contact with each other. The shaft member 167 is arranged inside these tubular portions 163. Both ends of the shaft member 167 project in a flange shape to the outside of the shaft member 167, and the overhanging portion engages with the folded portion at the tip of each tubular portion 163, whereby the shaft member 167 becomes a tubular portion. It is designed so that it does not come off from 163.

ところで、ストランド１１ａ、１１ｂはそれぞれ太さを有するため、螺旋の半径は内外のストランド１１ａ、１１ｂで若干の差があり、その全長も内外のストランド１１ａ、１１ｂで異なる。したがって、内外のストランド１１ａ、１１ｂの接合部の各ストランド１１ａ、１１ｂの長さに対する間隔も異なっている。 By the way, since the strands 11a and 11b each have a thickness, the radius of the spiral is slightly different between the inner and outer strands 11a and 11b, and the total length thereof is also different between the inner and outer strands 11a and 11b. Therefore, the distance between the lengths of the respective strands 11a and 11b at the joints of the inner and outer strands 11a and 11b is also different.

また図６（ａ）に示すように、それぞれの螺旋の高さを変えた場合、高さに応じて径が変化する。図６（ａ）では、ストランド１１ａ、１１ｂの上下端がちょうど上下の位置関係にあるが、螺旋の高さを変えた場合、このようにストランド１１ａ、１１ｂの始点終点の旋回方向の位置が変わらなければ、径の変化は、外側と内側で異なる。 Further, as shown in FIG. 6A, when the height of each spiral is changed, the diameter changes according to the height. In FIG. 6A, the upper and lower ends of the strands 11a and 11b are in a vertical positional relationship, but when the height of the spiral is changed, the positions of the start points and end points of the strands 11a and 11b in the turning direction change in this way. If not, the change in diameter is different on the outside and on the inside.

そのため、図６（ｂ）に示すように、鉄筋籠１が伸長する（鉄筋籠１が縮径する）と、内外のストランド１１ａ、１１ｂの螺旋半径の差はd1からd2へと大きくなる。従って、鉄筋籠１を伸長すると内外のストランド１１ａ、１１ｂの間隔は大きくなるため、接合部として、この間隔の変化に対応できるものを使用することも望ましい。 Therefore, as shown in FIG. 6B, when the reinforcing bar cage 1 is extended (the diameter of the reinforcing bar cage 1 is reduced), the difference in the spiral radii of the inner and outer strands 11a and 11b increases from d1 to d2. Therefore, when the reinforcing bar cage 1 is extended, the distance between the inner and outer strands 11a and 11b becomes large, and it is also desirable to use a joint that can cope with the change in the distance.

すなわち、内外のストランド１１ａ、１１ｂの接合部について、ストランド１１ａ、１１ｂを回転可能に接合するのに加え、内外のストランド１１ａ、１１ｂの間隔を可変とするものを用いてもよい。 That is, with respect to the joint portions of the inner and outer strands 11a and 11b, in addition to rotatably joining the strands 11a and 11b, those having a variable spacing between the inner and outer strands 11a and 11b may be used.

図７（ａ）は内外のストランド１１ａ、１１ｂの間隔を可変とする接合部１１０の例であり、一対の挿入部１１１、頭付きピン１１２、筒体１１３等により構成される。 FIG. 7A is an example of a joint portion 110 in which the distance between the inner and outer strands 11a and 11b is variable, and is composed of a pair of insertion portions 111, a headed pin 112, a tubular body 113, and the like.

挿入部１１１は筒状の部材であり、一対の挿入部１１１のそれぞれに外側ストランド１１ａと内側ストランド１１ｂが挿入される。筒体１１３は、軸方向の一方の端部が一方の挿入部１１１に固定され、他方の端部が閉じられる。当該端部には孔１１４が設けられ、他方の挿入部１１１に固定された頭付きピン１１２の軸部が孔１１４に挿入される。頭付きピン１１２の頭部は筒体１１３内に配置され、頭部の径が孔１１４の径より大きいことにより、頭付きピン１１２が筒体１１３から外れることはない。 The insertion portion 111 is a tubular member, and the outer strand 11a and the inner strand 11b are inserted into each of the pair of insertion portions 111. One end of the tubular body 113 in the axial direction is fixed to one insertion portion 111, and the other end is closed. A hole 114 is provided at the end portion, and a shaft portion of a headed pin 112 fixed to the other insertion portion 111 is inserted into the hole 114. The head of the headed pin 112 is arranged in the cylinder 113, and the diameter of the head is larger than the diameter of the hole 114, so that the headed pin 112 does not come off from the cylinder 113.

この接合部１１０は、頭付きピン１１２が筒体１１３内を進退することで、矢印に示すように内外のストランド１１ａ、１１ｂの間隔の変化に対応できる。 The joint portion 110 can respond to changes in the spacing between the inner and outer strands 11a and 11b as shown by the arrows by moving the headed pin 112 back and forth in the tubular body 113.

図７（ｂ）は別の接合部１１０ａの例である。接合部１１０ａは、一対の挿入部１１５と板材１１６を、ボルト１１８とナット１１９により連結したものである。 FIG. 7B is an example of another joint portion 110a. The joint portion 110a is formed by connecting a pair of insertion portions 115 and a plate material 116 by bolts 118 and nuts 119.

挿入部１１５は筒状の部材であり、一対の挿入部１１５のそれぞれに外側ストランド１１ａと内側ストランド１１ｂが挿入される。各挿入部１１５は板材１１６に取り付けられる。板材１１６は孔１１７を有し、各板材１１６が孔１１７の位置を合わせて配置される。これらの孔１１７には、一方の板材１１６側からボルト１１８の軸部が通され、他方の板材１１６から突出する軸部の先端にナット１１９が設けられる。 The insertion portion 115 is a tubular member, and the outer strand 11a and the inner strand 11b are inserted into each of the pair of insertion portions 115. Each insertion portion 115 is attached to the plate material 116. The plate material 116 has holes 117, and each plate material 116 is arranged so that the positions of the holes 117 are aligned. A shaft portion of the bolt 118 is passed through these holes 117 from the side of one plate member 116, and a nut 119 is provided at the tip of the shaft portion protruding from the other plate member 116.

この接合部１１０ａは、両板材１１６がボルト１１８の軸部に沿って移動することで、板材１１６の間隔がボルト１１８の頭部とナット１１９の間隔を限度として変化し、矢印に示すように内外のストランド１１ａ、１１ｂの間隔の変化に対応できる。また、外側ストランド１１ａと内側ストランド１１ｂをそれぞれ２本一組として螺旋状に配置することも可能であり、この場合は図７（ｃ）の接合部１１０ａ’に示すように板材１１６に２つの挿入部１１５を設け、これらの挿入部１１５に２本の外側ストランド１１ａまたは２本の内側ストランド１１ｂを挿入すればよい。 In this joint portion 110a, when both plate members 116 move along the shaft portion of the bolt 118, the distance between the plate members 116 changes within the limit of the distance between the head of the bolt 118 and the nut 119, and as shown by the arrows, inside and outside. It is possible to cope with the change in the spacing between the strands 11a and 11b. Further, it is also possible to arrange the outer strands 11a and the inner strands 11b as a set of two in a spiral shape. In this case, two inserts are inserted into the plate material 116 as shown in the joint portion 110a'in FIG. The portions 115 may be provided, and two outer strands 11a or two inner strands 11b may be inserted into these insertion portions 115.

なお、前記したストランド１１ａ、１１ｂの間隔の変化は、鉄筋籠１を捩じることで元に戻すことも可能であり、内外のストランド１１ａ、１１ｂの接合部は両ストランド１１ａ、１１ｂを回転可能に接合するだけでも特に問題はない。 The change in the spacing between the strands 11a and 11b can be restored by twisting the reinforcing bar cage 1, and the joints of the inner and outer strands 11a and 11b can rotate both strands 11a and 11b. There is no particular problem just by joining to.

鉄筋籠１の伸縮に伴う内外のストランド１１ａ、１１ｂの螺旋半径の差を一定にし、間隔を保持するためには、内側のストランド１１ｂの螺旋半径を大きくする、または外側のストランド１１ａの螺旋半径を小さくする、あるいはその両方が必要になる。したがって、図５に例示したような間隔の変化に対応できない接合部１６の場合は、籠全体を捩じればよい。この捩じる角度は、一般の場合、数度から十数度程度であるが、籠の吊り方などの施工方法によっては機構が複雑になるため、そうした場合には、図７のような間隔の変化に対応できる構造とするのがよい。 In order to keep the difference between the spiral radii of the inner and outer strands 11a and 11b due to the expansion and contraction of the reinforcing bar cage 1 and to maintain the space, increase the spiral radius of the inner strand 11b or increase the spiral radius of the outer strand 11a. You need to make it smaller, or both. Therefore, in the case of the joint portion 16 that cannot cope with the change in the interval as illustrated in FIG. 5, the entire cage may be twisted. This twisting angle is generally about several degrees to a dozen degrees, but the mechanism becomes complicated depending on the construction method such as how to hang the basket, so in such a case, the interval as shown in FIG. 7 It is better to have a structure that can respond to changes in.

その他、図８（ａ）に示すように、鉄筋籠１の下端部において、鉄筋籠１の周方向に離れた位置にある内外のストランド１１ａ、１１ｂ（例えば、図４（ａ）に示す鉄筋籠１の下端において同じ傾斜となっている、当該下端において鉄筋籠１の中心に関し対称となる位置にある内外のストランド１１ａ－１、１１ｂ－１）の下端部同士をＵ字状に連続させてもよい。 In addition, as shown in FIG. 8A, the inner and outer strands 11a and 11b (for example, the reinforcing bar cage shown in FIG. 4A) located at the lower end of the reinforcing bar cage 1 at positions separated in the circumferential direction of the reinforcing bar cage 1 (for example, the reinforcing bar cage shown in FIG. 4A). Even if the lower ends of the inner and outer strands 11a-1 and 11b-1), which have the same inclination at the lower end of 1 and are symmetrical with respect to the center of the reinforcing bar cage 1 at the lower end, are continuous in a U shape. good.

この場合、鉄筋籠１の下端部を立坑３の底部に押し付けることで、図８（ｂ）に示すように鉄筋籠１の下端部に拡径部分を形成し、この拡径部分を立坑３の拡幅部３１に配置することもできる。また内外のストランド１１ａ、１１ｂを連続させることで前記した内外のストランド１１ａ、１１ｂの間隔の変化も抑制でき、内外のストランド１１ａ、１１ｂの連続部分により、鉄筋籠１の下端部の基礎１００のコンクリートへの定着効果も高めることができる。 In this case, by pressing the lower end portion of the reinforcing bar cage 1 against the bottom portion of the shaft 3, a diameter-expanded portion is formed at the lower end portion of the reinforcing bar cage 1 as shown in FIG. It can also be arranged in the widening portion 31. Further, by making the inner and outer strands 11a and 11b continuous, the change in the interval between the inner and outer strands 11a and 11b can be suppressed, and the continuous portion of the inner and outer strands 11a and 11b makes the concrete of the foundation 100 at the lower end of the reinforcing bar cage 1. The fixing effect on concrete can also be enhanced.

また、前記の拡径用治具１４（１４ａ）を鉄筋籠１の下端部とその上方に複数段設け、これらの拡径用治具１４の先端部１４２（１４２ａ）同士を鉛直材で接続してもよい。これにより、図４（ｂ）に示す工程で鉄筋籠１の下端部の拡径用治具１４（１４ａ）だけでなくその上方の拡径用治具１４（１４ａ）も拡径し、鉄筋籠１の上下の複数箇所で同時に拡径部分を形成することができる。 Further, the diameter-expanding jig 14 (14a) is provided in a plurality of stages at the lower end portion of the reinforcing bar cage 1 and above the lower end portion thereof, and the tip portions 142 (142a) of the diameter-expanding jig 14 are connected to each other by a vertical material. You may. As a result, in the process shown in FIG. 4B, not only the diameter-expanding jig 14 (14a) at the lower end of the reinforcing bar cage 1 but also the diameter-expanding jig 14 (14a) above the diameter-expanding jig 14 (14a) is expanded, and the reinforcing bar cage is expanded. The enlarged diameter portion can be formed at a plurality of locations above and below 1 at the same time.

以上、添付図面を参照して、本発明の好適な実施形態について説明したが、本発明は係る例に限定されない。当業者であれば、本願で開示した技術的思想の範疇内において、各種の変更例または修正例に想到し得ることは明らかであり、それらについても当然に本発明の技術的範囲に属するものと了解される。 Although preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that a person skilled in the art can come up with various modified or modified examples within the scope of the technical idea disclosed in the present application, and these also naturally belong to the technical scope of the present invention. Understood.

１：鉄筋籠
２：地盤
３：立坑
１１ａ：外側ストランド
１１ｂ：内側ストランド
１３：拘束リング
１４、１４ａ：拡径用治具
３１、１０１：拡幅部
１００：基礎
１４１：リング材
１４２：先端部
１４３：アーム
１４４：取付部 1: Reinforcing bar cage 2: Ground 3: Shaft sinking 11a: Outer strand 11b: Inner strand 13: Restraint ring 14, 14a: Diameter expansion jig 31, 101: Widening portion 100: Foundation 141: Ring material 142: Tip portion 143: Arm 144: Mounting part

Claims (6)

上下に伸縮可能な鉄筋籠であって、
鉄筋籠の周方向に間隔を空けて配置された可とう性を有する複数本の螺旋状の軸方向鋼材が、旋回方向を変えて内外に設けられ、内外の軸方向鋼材が交差部で回転可能に接合されたことを特徴とする鉄筋籠。 It is a rebar basket that can be expanded and contracted up and down.
Multiple flexible spiral axial steel materials arranged at intervals in the circumferential direction of the reinforcing bar cage are provided inside and outside by changing the turning direction, and the inner and outer axial steel materials can rotate at the intersection. A reinforced basket characterized by being joined to. 前記鉄筋籠を拡径させるための拡径用治具が前記鉄筋籠の下端部に設けられたことを特徴とする請求項１記載の鉄筋籠。 The reinforcing bar cage according to claim 1, wherein a diameter-expanding jig for expanding the diameter of the reinforcing bar cage is provided at the lower end portion of the reinforcing bar cage. 前記拡径用治具は、
前記軸方向鋼材の下端部が取り付けられた取付部と、
前記取付部の下方に設けられた先端部と、
前記取付部と前記先端部に両端部を取り付けて放射状に複数本配置されたアームと、
を有し、
前記アームは、前記先端部を通る鉛直面において回転可能に前記先端部と前記取付部に取り付けられることを特徴とする請求項２記載の鉄筋籠。 The diameter expansion jig is
The mounting part to which the lower end of the axial steel material is mounted and
The tip provided below the mounting portion and
A plurality of arms arranged radially with both ends attached to the attachment portion and the tip portion, and
Have,
The reinforcing bar cage according to claim 2, wherein the arm is rotatably attached to the tip portion and the mounting portion in a vertical plane passing through the tip portion. 内側の前記軸方向鋼材と外側の前記軸方向鋼材とが前記鉄筋籠の下端部において連続していることを特徴とする請求項１記載の鉄筋籠。 The reinforcing bar cage according to claim 1, wherein the inner axial steel material and the outer axial steel material are continuous at the lower end portion of the reinforcing bar cage. 前記鉄筋籠の径を拘束するための拘束リングが設けられたことを特徴とする請求項２から請求項４のいずれかに記載の鉄筋籠。 The reinforcing bar cage according to any one of claims 2 to 4, wherein a restraining ring for restraining the diameter of the reinforcing bar cage is provided. 請求項２から請求項５のいずれかに記載の鉄筋籠を、底部に拡幅部を有する立坑内に伸長した状態で建て込み、前記鉄筋籠の下端部を拡径させてその拡径部分を前記拡幅部に配置し、
前記立坑にコンクリートを打設することを特徴とするコンクリート構造物の構築方法。 The reinforcing bar cage according to any one of claims 2 to 5 is built in a state of being extended in a shaft having a widening portion at the bottom, and the lower end portion of the reinforcing bar cage is expanded in diameter to expand the diameter of the expanded portion. Placed in the widened part,
A method for constructing a concrete structure, which comprises placing concrete in the shaft.
JP2020188859A 2020-11-12 2020-11-12 Method of constructing reinforced cages and concrete structures Active JP7422055B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2020188859A JP7422055B2 (en) 2020-11-12 2020-11-12 Method of constructing reinforced cages and concrete structures

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2020188859A JP7422055B2 (en) 2020-11-12 2020-11-12 Method of constructing reinforced cages and concrete structures

Publications (2)

Publication Number Publication Date
JP2022077829A true JP2022077829A (en) 2022-05-24
JP7422055B2 JP7422055B2 (en) 2024-01-25

Family

ID=81706883

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2020188859A Active JP7422055B2 (en) 2020-11-12 2020-11-12 Method of constructing reinforced cages and concrete structures

Country Status (1)

Country Link
JP (1) JP7422055B2 (en)

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009127413A (en) 2007-11-20 2009-06-11 Yutaka Abe Cross spiral-reinforcement structure
JP2018172870A (en) 2017-03-31 2018-11-08 東日本旅客鉄道株式会社 Reinforcing bar cage and method of building reinforcing bar cage

Also Published As

Publication number Publication date
JP7422055B2 (en) 2024-01-25

Similar Documents

Publication Publication Date Title
JP6871781B2 (en) Reinforcing bar cage pile head fixing and holding structure
JP4757047B2 (en) Connection method and structure of pile and column member using frame and frame
CN104204377A (en) Reinforcement assembly and shear reinforcing bars used for reinforced concrete structure
JP2018172870A (en) Reinforcing bar cage and method of building reinforcing bar cage
JP2022077829A (en) Reinforcement cage and construction method of concrete structure
US20200200297A1 (en) Concrete Reinforcement Elements and Structures
EP1284316B1 (en) Net body using spiral wires
US20040237449A1 (en) Spiral ties for reinforced columns
KR102000261B1 (en) A quadrilateral lattice girder having high strength Spider
JP5836865B2 (en) Joint structure between steel pipe pile and pile head, and concrete foundation construction method using this joint structure
KR101644449B1 (en) Phc pile using joint plate and connecting fin
JP7422054B2 (en) Concrete structure construction method and concrete structure
JP5340852B2 (en) Hollow body edge with welded wire mesh for connection, wire mesh and fence provided with the same
JP3131259U (en) Frame structure of a column structure using helical muscles
KR200394047Y1 (en) corrugated steel plate and connection apparatus of the same
JP2020029662A (en) Reinforcement structure and composite slab structure provided with the same
JP2020190158A (en) Method for constructing structure, and structure
JP4841899B2 (en) Construction method of soil cement column wall
JPH0715167B2 (en) Method for constructing cast-in-place concrete reinforced concrete pile and reinforced basket used for this method
JP7129327B2 (en) Reinforcing member and method for manufacturing reinforcing member
JP7422053B2 (en) Method of constructing concrete structures and reinforcing cages
KR102203621B1 (en) Hoop bar locking device
JP5739219B2 (en) Assembly jigs for concrete products and concrete product reinforcement
JP4488853B2 (en) Coupling jig and housing
JP2009264045A (en) Reinforcement arrangement construction method of concrete construction beam

Legal Events

Date Code Title Description
A621 Written request for application examination

Free format text: JAPANESE INTERMEDIATE CODE: A621

Effective date: 20230427

TRDD Decision of grant or rejection written
A977 Report on retrieval

Free format text: JAPANESE INTERMEDIATE CODE: A971007

Effective date: 20231220

A01 Written decision to grant a patent or to grant a registration (utility model)

Free format text: JAPANESE INTERMEDIATE CODE: A01

Effective date: 20240109

A61 First payment of annual fees (during grant procedure)

Free format text: JAPANESE INTERMEDIATE CODE: A61

Effective date: 20240115

R150 Certificate of patent or registration of utility model

Ref document number: 7422055

Country of ref document: JP

Free format text: JAPANESE INTERMEDIATE CODE: R150