JP6853299B2

JP6853299B2 - Joining structure and joining method of concrete structures

Info

Publication number: JP6853299B2
Application number: JP2019097009A
Authority: JP
Inventors: 安永　正道; 正道安永
Original assignee: Kajima Corp
Current assignee: Kajima Corp
Priority date: 2019-05-23
Filing date: 2019-05-23
Publication date: 2021-03-31
Anticipated expiration: 2035-07-28
Also published as: JP2019135376A

Description

本発明は、コンクリート構造物の接合構造及び接合方法に関する。 The present invention relates to a joining structure and a joining method of a concrete structure.

従来、予め工場で製作され施工現場において接合されるプレキャスト型枠やプレキャスト部材といったコンクリート構造物が知られている。例えば、特許文献１には、互いに対向配置されるプレキャストコンクリート製の型枠本体を有するコンクリート構造物が記載されている。このコンクリート構造物では、型枠本体に主鉄筋が埋設されている。また、対向配置される型枠本体間には、せん断補強筋が配筋され、コンクリートが打設される。 Conventionally, concrete structures such as precast formwork and precast members that are manufactured in advance at a factory and joined at a construction site are known. For example, Patent Document 1 describes a concrete structure having a precast concrete formwork body arranged so as to face each other. In this concrete structure, the main reinforcing bar is embedded in the formwork body. Further, shear reinforcing bars are arranged between the formwork bodies arranged to face each other, and concrete is placed.

特開平７−８０８２２号公報Japanese Unexamined Patent Publication No. 7-80822

一般に、このような従来の技術では、複数のピースに分割されたコンクリート構造物が互いに接合されることによって、より大きなコンクリート構造物が構築される。例えば、コンクリート構造物が上下に数段、左右に数列連続して接合されることによって、擁壁、竪壁、壁高欄等の構造物が構築される。この場合、隣接するコンクリート構造物に埋設された主筋（縦鉄筋及び横鉄筋）が互いに接合される。 Generally, in such a conventional technique, a larger concrete structure is constructed by joining concrete structures divided into a plurality of pieces to each other. For example, a structure such as a retaining wall, a vertical wall, or a wall balustrade is constructed by continuously joining concrete structures in several stages vertically and several rows horizontally. In this case, the main reinforcing bars (vertical reinforcing bars and horizontal reinforcing bars) buried in the adjacent concrete structures are joined to each other.

そのため、複数のコンクリート構造物を所定の位置に設置したうえで、隣接するコンクリート構造物に埋設された主筋を互いに接合する必要があり、施工に手間が掛かっていた。また、例えばコンクリート構造物内に主筋が埋設されていない場合（例えばプレキャスト型枠の一形態）、対向配置されるコンクリート構造物間に別途主筋を配設する必要があった。 Therefore, it is necessary to install a plurality of concrete structures at predetermined positions and then join the main bars embedded in the adjacent concrete structures to each other, which is troublesome for construction. Further, for example, when the main bar is not embedded in the concrete structure (for example, one form of the precast formwork), it is necessary to separately arrange the main bar between the concrete structures arranged opposite to each other.

本発明は、施工の手間を低減することができるコンクリート構造物の接合構造及び接合方法を提供することを目的とする。 An object of the present invention is to provide a joining structure and a joining method of a concrete structure capable of reducing the labor of construction.

本発明の一形態は、互いに接合された複数のコンクリート構造物の接合構造であって、コンクリート構造物には、連設方向に沿って延在する主筋が埋設され、連設方向に互いに接合される一方のコンクリート構造物は、他方のコンクリート構造物に接合される第１の接合面を有した第１の接合部を備え、他方のコンクリート構造物は、一方のコンクリート構造物に接合される第２の接合面を有した第２の接合部を備え、第１の接合部では、主筋の端部が他方のコンクリート構造物側に第１の接合面から突出し、第２の接合部では、主筋の端部が、第２の接合面まで、又は、第２の接合面よりも手前の位置まで延在し、第１の接合面における主筋の端部と第２の接合面における主筋の端部とは、連設方向において所定距離重複している。 One embodiment of the present invention is a joint structure of a plurality of concrete structures joined to each other, in which main bars extending along the continuous connection direction are embedded and joined to each other in the continuous connection direction. One concrete structure comprises a first joint having a first joint surface to be joined to the other concrete structure, and the other concrete structure is joined to one concrete structure. A second joint having two joint surfaces is provided, in which the end of the main bar protrudes toward the other concrete structure from the first joint surface, and in the second joint, the main bar The end of the main bar extends to the second joint surface or to a position in front of the second joint surface, and the end of the main bar at the first joint surface and the end of the main bar at the second joint surface. Is overlapped by a predetermined distance in the continuous installation direction.

このようなコンクリート構造物の接合構造によれば、予めコンクリート構造物に主筋が埋設されているため、コンクリート構造物を設置した後に別途主筋を配設する必要がない。そして、一方のコンクリート構造物における第１の接合面と他方のコンクリート構造物における第２の接合面とが互いに接合された状態で、それぞれの主筋の端部同士が連設方向において所定距離重複している。これにより、主筋の端部同士が、いわゆる重ね継手を構成することになるので、別途主筋同士を接合する必要がない。したがって、施工の手間を低減することができる。 According to such a joint structure of the concrete structure, since the main bar is embedded in the concrete structure in advance, it is not necessary to separately dispose the main bar after installing the concrete structure. Then, in a state where the first joint surface of one concrete structure and the second joint surface of the other concrete structure are joined to each other, the ends of the main bars overlap each other by a predetermined distance in the continuous installation direction. ing. As a result, the ends of the main bars form a so-called lap joint, so that it is not necessary to separately join the main bars to each other. Therefore, the labor of construction can be reduced.

また、第１の接合面における主筋の端部と第２の接合面における主筋の端部とは、連設方向に直交する方向において主筋の径以下の距離で互いに隣接して配置されている構成でもよい。この場合、主筋同士が近接又は接触されることにより、主筋同士の重複部分が重ね継手として有効に機能する。 Further, the end of the main bar on the first joint surface and the end of the main bar on the second joint surface are arranged adjacent to each other at a distance equal to or less than the diameter of the main bar in the direction orthogonal to the continuous connection direction. But it may be. In this case, when the main bars are brought close to each other or in contact with each other, the overlapping portion of the main bars effectively functions as a lap joint.

また、コンクリート構造物には、一対の主筋が埋設されており、一対の主筋は連設方向に直交する方向に互いに対向して配置されている構成でもよい。この構成によれば、コンクリート構造物をプレキャスト部材として用いることができる。 Further, a pair of main bars are embedded in the concrete structure, and the pair of main bars may be arranged so as to face each other in a direction orthogonal to the continuous installation direction. According to this configuration, a concrete structure can be used as a precast member.

また、コンクリート構造物は、連設方向に直交する方向に離間して対になるように配置されており、当該離間して配置されたコンクリート構造物間にコンクリート又はモルタルが充填されている構成でもよい。この構成によれば、コンクリート構造物をプレキャスト型枠として用いることができる。 Further, the concrete structures are arranged so as to be separated from each other in a direction orthogonal to the continuous installation direction, and concrete or mortar is filled between the separated concrete structures. Good. According to this configuration, the concrete structure can be used as a precast formwork.

また、コンクリート構造物には、連設方向と直交する方向に突出するせん断補強鉄筋が形成されており、せん断補強鉄筋は、離間して配置されたコンクリート構造物間に配置されている構成でもよい。この構成によれば、コンクリート構造物を設置した後に、別途せん断補強鉄筋を配設する必要がない。 Further, the concrete structure is formed with shear reinforcing bars protruding in a direction orthogonal to the continuous installation direction, and the shear reinforcing bars may be arranged between the concrete structures arranged apart from each other. .. According to this configuration, it is not necessary to separately dispose the shear reinforcing bars after installing the concrete structure.

また、せん断補強鉄筋では、離間して配置される一方側のコンクリート構造物から突出するせん断補強鉄筋と他方側のコンクリート構造物から突出するせん断補強鉄筋とが、連設方向にせん断補強鉄筋の径以下の距離で互いに隣接して配置されている構成でもよい。この場合、近接又は接触されているせん断補強鉄筋同士が重ね継手として有効に機能する。 Further, in the shear reinforcing bar, the shear reinforcing bar protruding from the concrete structure on one side and the shear reinforcing bar protruding from the concrete structure on the other side, which are arranged apart from each other, have the diameter of the shear reinforcing bar in the continuous installation direction. It may be configured so as to be adjacent to each other at the following distances. In this case, the shear reinforcing bars in close proximity or in contact with each other effectively function as a lap joint.

また、本発明によるコンクリート構造物の接合方法は、連設方向に沿って延在する主筋と、連設方向に形成された第１の接合面から突出する主筋の端部と、を備える一方のコンクリート構造物と、連設方向に沿って延在する主筋と、連設方向に形成された第２の接合面まで、又は、当該第２の接合面よりも手前の位置まで延在する主筋の端部と、を備える他方のコンクリート構造物とを互いに接合する接合方法であって、一方のコンクリート構造物及び他方のコンクリート構造物のいずれか一方が設置されている状態で、一方のコンクリート構造物及び他方のコンクリート構造物のいずれか他方を上方から下方に垂直に移動させることによって、一方のコンクリート構造物と他方のコンクリート構造物との主筋の端部同士が、連設方向において所定距離重複するとともに、第１の接合面と第２の接合面とが互いに接合するように配置される工程を含む。 Further, the method for joining a concrete structure according to the present invention includes one of a main bar extending along the continuous connection direction and an end portion of the main bar protruding from the first joint surface formed in the continuous connection direction. A concrete structure, a main bar extending along the continuous connection direction, and a main bar extending to a second joint surface formed in the continuous connection direction or to a position in front of the second joint surface. A joining method in which an end portion and the other concrete structure provided with the same are joined to each other, and one concrete structure is installed in a state where one of the one concrete structure and the other concrete structure is installed. And by moving the other of the other concrete structures vertically from above to below, the ends of the main bars of one concrete structure and the other concrete structure overlap by a predetermined distance in the continuous installation direction. At the same time, it includes a step of arranging the first joint surface and the second joint surface so as to join each other.

このようなコンクリート構造物の接合方法によれば、一方のコンクリート構造物及び他方のコンクリート構造物のいずれか他方を上方から下方に垂直に移動させることによって、一方のコンクリート構造物と他方のコンクリート構造物との接合面同士が互いに当接される。このとき、主筋の端部同士が連設方向に所定距離重複する。この状態では、主筋同士は、いわゆる重ね継手によって接合されることになるので、別途主筋同士を接合する必要がない。したがって、施工の手間を低減することができる。 According to such a method of joining concrete structures, one concrete structure and the other concrete structure are vertically moved from above to below by either one of the concrete structures and the other. The joint surfaces with the object are brought into contact with each other. At this time, the ends of the main bars overlap each other by a predetermined distance in the continuous installation direction. In this state, the main bars are joined by so-called lap joints, so that it is not necessary to separately join the main bars. Therefore, the labor of construction can be reduced.

また、工程において、一方のコンクリート構造物と他方のコンクリート構造物との端部同士が、連設方向に直交する方向において主筋の径以下の距離で互いに隣接して配置される構成でもよい。この場合、主筋同士が近接又は接触されることにより、主筋同士の重複部分が重ね継手として有効に機能する。 Further, in the process, the ends of one concrete structure and the other concrete structure may be arranged adjacent to each other at a distance equal to or less than the diameter of the main bar in the direction orthogonal to the continuous installation direction. In this case, when the main bars are brought close to each other or in contact with each other, the overlapping portion of the main bars effectively functions as a lap joint.

本発明のコンクリート構造物の接合構造及び接合方法によれば、施工の手間を低減することができる。 According to the joining structure and joining method of the concrete structure of the present invention, it is possible to reduce the labor of construction.

プレキャスト部材の組み立て工程を示す図である。It is a figure which shows the assembly process of a precast member. プレキャスト部材の水平方向の断面図である。It is sectional drawing in the horizontal direction of a precast member. プレキャスト部材を連設方向に沿って垂直に切断した断面図である。It is sectional drawing which cut the precast member vertically along the continuous installation direction. プレキャスト部材が接合されている状態を示す断面図である。It is sectional drawing which shows the state which the precast member is joined. プレキャスト部材が接合されている状態を示す断面図である。It is sectional drawing which shows the state which the precast member is joined. プレキャスト型枠の水平方向の断面図である。It is sectional drawing in the horizontal direction of the precast formwork. プレキャスト型枠を連設方向に直交する方向に切断した断面図である。It is sectional drawing which cut the precast formwork in the direction orthogonal to the continuous installation direction. プレキャスト型枠が接合されている状態を示す断面図の一例である。This is an example of a cross-sectional view showing a state in which the precast formwork is joined. プレキャスト型枠が上下に接合されている状態を示す断面図である。It is sectional drawing which shows the state which the precast formwork is joined up and down.

以下、本発明に係る実施の形態について図面を参照しながら具体的に説明する。便宜上、実質的に同一の要素には同一の符号を付し、その説明を省略する場合がある。本発明は、主筋が埋設されたコンクリート構造物に広く適用可能であるが、ここではプレキャスト部材及びプレキャスト型枠に適用した場合の例について説明する。なお、以下の説明において、「直交」とは厳密に直交する場合のみならず、例えば機能的又は作用的に直交とみなし得る程度に交差する場合を含む。また、「水平」及び「鉛直」についても、機能的又は作用的に水平及び鉛直とみなし得る場合を含む。 Hereinafter, embodiments according to the present invention will be specifically described with reference to the drawings. For convenience, substantially the same elements may be designated by the same reference numerals and the description thereof may be omitted. The present invention is widely applicable to concrete structures in which main bars are embedded, but here, an example when applied to a precast member and a precast formwork will be described. In the following description, "orthogonal" includes not only the case of being strictly orthogonal but also the case of intersecting to the extent that it can be regarded as orthogonal functionally or functionally. In addition, "horizontal" and "vertical" also include cases where they can be regarded as horizontal and vertical functionally or functionally.

（第１実施形態）
図１は、コンクリート構造物としてのプレキャスト部材の組み立て工程を示す図である。図示例では、左右に４列連設されたプレキャスト部材１の３段目が組み上げられている工程が示されている。このように本実施形態では、プレキャスト部材１が上下に数段、左右に数列連続して接合されることによって、擁壁、竪壁、壁高欄等の鉄筋コンクリート構造物が構築される。以下、プレキャスト部材１の構造、及び、互いに接合された複数のプレキャスト部材１の接合構造Ｃ１について詳細に説明する。なお、以下の説明では、水平方向のうち、プレキャスト部材１が連設される方向を連設方向とし、この連設方向に直交する方向をプレキャスト部材１の幅方向とする。 (First Embodiment)
FIG. 1 is a diagram showing an assembly process of a precast member as a concrete structure. In the illustrated example, a process in which the third stage of the precast members 1 arranged in four rows on the left and right is assembled is shown. As described above, in the present embodiment, a reinforced concrete structure such as a retaining wall, a vertical wall, and a wall balustrade is constructed by continuously joining the precast members 1 in several stages vertically and in several rows horizontally. Hereinafter, the structure of the precast member 1 and the joining structure C1 of the plurality of precast members 1 joined to each other will be described in detail. In the following description, of the horizontal directions, the direction in which the precast members 1 are continuously connected is defined as the continuous connecting direction, and the direction orthogonal to the continuous connecting direction is defined as the width direction of the precast members 1.

図２は、プレキャスト部材１の水平方向の断面図である。また、図３は、プレキャスト部材１を連設方向に沿って垂直に切断した断面図である。なお、図３では、せん断補強鉄筋１７が省略されている。図２、３に示されるように、プレキャスト部材１は、略直方体形状の部材本体３と、部材本体３に埋設された主筋１１及びせん断補強鉄筋１７とを有している。 FIG. 2 is a cross-sectional view of the precast member 1 in the horizontal direction. Further, FIG. 3 is a cross-sectional view of the precast member 1 cut vertically along the continuous installation direction. In FIG. 3, the shear reinforcing bar 17 is omitted. As shown in FIGS. 2 and 3, the precast member 1 has a member main body 3 having a substantially rectangular parallelepiped shape, a main bar 11 embedded in the member main body 3, and a shear reinforcing reinforcing bar 17.

部材本体３は、コンクリートによって形成されており、連設方向の一方の端部に接合面（第１の接合面）５ａを有した接合部（第１の接合部）５が形成され、他方の端部に接合面（第２の接合面）７ａを有した接合部（第２の接合部）７が形成されている。一方の接合部５では、端面が連設方向に直交する平面となっており、これによって接合面５ａが形成されている。また、他方の接合部７では、幅方向の両端のみに接合面７ａが形成されている。図示例の接合部７は、部材本体３から連設方向に突出する一対の接合片９を有している。接合片９は、部材本体３の幅方向の両端３ａからそれぞれ内側に所定の厚みを有している。また、接合片９は、部材本体３の上端から下端まで延在している。これにより、接合片９同士は幅方向に離間して配置されることになり、接合片９同士の間に所定の空間ＳＰが形成される。この空間ＳＰは、部材本体３の上端から下端まで連続しており、連設方向の他方側、上方及び下方に対して開放されている。また、接合片９の連設方向の端面によって接合面７ａが形成されている。なお、接合片９はコンクリートによって部材本体３と一体的に形成されている。 The member main body 3 is formed of concrete, and a joint portion (first joint portion) 5 having a joint surface (first joint surface) 5a is formed at one end in the continuous connection direction, and the other. A joint portion (second joint portion) 7 having a joint surface (second joint surface) 7a is formed at the end portion. On the other hand, the joint portion 5 has an end surface that is a plane orthogonal to the continuous installation direction, whereby the joint surface 5a is formed. Further, in the other joint portion 7, the joint surfaces 7a are formed only at both ends in the width direction. The joint portion 7 of the illustrated example has a pair of joint pieces 9 protruding from the member main body 3 in the continuous installation direction. The joint piece 9 has a predetermined thickness inward from both ends 3a in the width direction of the member main body 3. Further, the joint piece 9 extends from the upper end to the lower end of the member main body 3. As a result, the joining pieces 9 are arranged apart from each other in the width direction, and a predetermined space SP is formed between the joining pieces 9. This space SP is continuous from the upper end to the lower end of the member main body 3, and is open to the other side, the upper side, and the lower side in the continuous connection direction. Further, the joint surface 7a is formed by the end faces of the joint pieces 9 in the continuous installation direction. The joint piece 9 is integrally formed with the member main body 3 by concrete.

主筋１１は、プレキャスト部材１の幅方向の両端側において互いに対向するように一対設けられている。この主筋１１は、連設方向に沿って水平に延在する横鉄筋１３と、横鉄筋１３に直交して鉛直方向に延在する縦鉄筋１５とを有している。横鉄筋１３は、鉛直方向に所定の間隔で複数配置されている。一方の接合部５では、横鉄筋１３の端部１３ａが接合面５ａから突出している。図示例における横鉄筋１３の端部１３ａは、半円形のループ形状であり、上下に隣接する２本の横鉄筋１３から延在している。横鉄筋１３における接合面５ａから突出している部分の連設方向の長さＬ１は、プレキャスト部材１の他端に形成された接合片９の連設方向の長さＬ２と略同じになっている。 A pair of main bars 11 are provided so as to face each other on both end sides of the precast member 1 in the width direction. The main reinforcing bar 11 has a horizontal reinforcing bar 13 extending horizontally along the continuous installation direction and a vertical reinforcing bar 15 extending in the vertical direction orthogonal to the horizontal reinforcing bar 13. A plurality of horizontal reinforcing bars 13 are arranged at predetermined intervals in the vertical direction. At the one joint portion 5, the end portion 13a of the horizontal reinforcing bar 13 protrudes from the joint surface 5a. The end portion 13a of the horizontal reinforcing bar 13 in the illustrated example has a semicircular loop shape and extends from two horizontal reinforcing bars 13 adjacent to the top and bottom. The length L1 of the portion of the horizontal reinforcing bar 13 protruding from the joint surface 5a in the continuous connection direction is substantially the same as the length L2 of the joint piece 9 formed at the other end of the precast member 1 in the continuous connection direction. ..

また、他方の接合部７では、横鉄筋１３の端部１３ｂが、接合面７ａまで延在している。この端部１３ｂも一方側と同様に半円形のループ形状であり、上下に隣接する２本の横鉄筋１３から延在している。横鉄筋１３の他方側の端部１３ｂは、部材本体３及び接合片９から露出しており、接合片９の内側面９ａに接している。すなわち、接合片９は、部材本体３におけるかぶりコンクリートとなる。横鉄筋１３は、他方側の端部１３ｂから一方側の端部１３ａにかけてプレキャスト部材１の幅方向内側に向かって傾くように配置されている。これにより、幅方向に離間して設けられる一対の横鉄筋１３における一方側の端部１３ａ同士の幅方向の間隔Ｄ１は、他方側の端部１３ｂ同士の間隔Ｄ２に比べて横鉄筋１３の鉄筋径の約２〜３倍小さく設定される。 Further, in the other joint portion 7, the end portion 13b of the horizontal reinforcing bar 13 extends to the joint surface 7a. The end portion 13b also has a semicircular loop shape as on one side, and extends from two lateral reinforcing bars 13 adjacent to the upper and lower sides. The other end 13b of the horizontal reinforcing bar 13 is exposed from the member main body 3 and the joint piece 9, and is in contact with the inner side surface 9a of the joint piece 9. That is, the joint piece 9 becomes the cover concrete in the member main body 3. The horizontal reinforcing bar 13 is arranged so as to be inclined inward in the width direction of the precast member 1 from the end portion 13b on the other side to the end portion 13a on the one side. As a result, the distance D1 in the width direction between the ends 13a on one side of the pair of horizontal reinforcing bars 13 provided apart from each other in the width direction is larger than the distance D2 between the ends 13b on the other side. It is set to be about 2 to 3 times smaller than the diameter.

縦鉄筋１５は、横鉄筋１３に当接して、横鉄筋１３に対してプレキャスト部材１の幅方向の内側に配置されている。本実施形態では、縦鉄筋１５は、横鉄筋１３のうち、部材本体３に埋設された部分と、部材本体３の連設方向の一方側に突出した部分とに当接して配置されている。横鉄筋１３と縦鉄筋１５とは、例えば鉄線（番線）等によって互いに固定されている。縦鉄筋１５の下端１５ａは、部材本体３よりも下方に延在している。また、部材本体３に埋設された縦鉄筋１５の上端１５ｂは、部材本体３の上部に埋設された筒状のシース６内に配置されている。縦鉄筋１５を重ね継手で接続する場合は、下端１５ａから上端１５ｂにかけて連設方向一方側に向かって傾くように配置されている。これにより、縦鉄筋１５の上端１５ｂは、下端１５ａに比べて鉄筋径の分だけ連設方向に沿ってずれている。 The vertical reinforcing bar 15 is in contact with the horizontal reinforcing bar 13 and is arranged inside the precast member 1 in the width direction with respect to the horizontal reinforcing bar 13. In the present embodiment, the vertical reinforcing bar 15 is arranged in contact with a portion of the horizontal reinforcing bar 13 that is embedded in the member main body 3 and a portion of the horizontal reinforcing bar 13 that protrudes to one side in the continuous connection direction. The horizontal reinforcing bar 13 and the vertical reinforcing bar 15 are fixed to each other by, for example, an iron wire (number line) or the like. The lower end 15a of the vertical reinforcing bar 15 extends below the member main body 3. Further, the upper end 15b of the vertical reinforcing bar 15 embedded in the member main body 3 is arranged in the tubular sheath 6 embedded in the upper part of the member main body 3. When the vertical reinforcing bars 15 are connected by a lap joint, they are arranged so as to be inclined toward one side in the continuous installation direction from the lower end 15a to the upper end 15b. As a result, the upper end 15b of the vertical reinforcing bar 15 is deviated from the lower end 15a along the continuous installation direction by the diameter of the reinforcing bar.

せん断補強鉄筋１７は、一対の主筋１１間において連設方向と直交する方向に水平に配置されており、横鉄筋１３に対して連結されている。すなわち、せん断補強鉄筋１７は、幅方向の一方側に配置された横鉄筋１３と他方側に配置された横鉄筋１３との両方に接続されることによって、これら横鉄筋１３同士を連結している。図示例では、せん断補強鉄筋１７は、横鉄筋１３における部材本体３に埋設され部分のみに連結されており、横鉄筋１３の連設方向における両側の端部１３ａ，１３ｂには設けられていない。 The shear reinforcing reinforcing bars 17 are horizontally arranged between the pair of main reinforcing bars 11 in a direction orthogonal to the connecting direction, and are connected to the horizontal reinforcing bars 13. That is, the shear reinforcing reinforcing bars 17 are connected to each other by being connected to both the horizontal reinforcing bars 13 arranged on one side in the width direction and the horizontal reinforcing bars 13 arranged on the other side. .. In the illustrated example, the shear reinforcing reinforcing bar 17 is embedded in the member main body 3 of the horizontal reinforcing bar 13 and connected only to the portion, and is not provided at the end portions 13a and 13b on both sides of the horizontal reinforcing bar 13 in the continuous connection direction.

図４は、互いに接合されている状態の２つのプレキャスト部材１を示す水平方向の断面図である。図５は、互いに接合されている状態の２つのプレキャスト部材１を連設方向に沿って垂直に切断した断面図である。図４に示されるように、左右に接合された２つのプレキャスト部材１では、一方のプレキャスト部材１における連設方向の他方側の接合部７と、他方のプレキャスト部材１における連設方向の一方側の接合部５とが接合された接合構造Ｃ１を形成している。この接合構造Ｃ１では、接合部５の接合面５ａと接合部７の接合面７ａとが互いに当接されている。この状態では、接合部７における一対の接合片９間に形成された空間ＳＰ内に、接合部５から突出した主筋１１の端部（端部１３ａとこれに連結された縦鉄筋１５）が配置される。また、接合構造Ｃ１では、一方のプレキャスト部材１における横鉄筋１３の端部１３ｂと、他方のプレキャスト部材１における横鉄筋の端部１３ａとが連設方向において互いに重複して延在している。すなわち、この重複する部分では連設方向に直交するいずれかの方向（本実施形態では水平方向）に端部１３ａと端部１３ｂとが隣接して配置されている。そして、この隣接する端部１３ａ，１３ｂによって重ね継手が形成されている。本実施形態では、一方の横鉄筋１３の端部１３ｂと他方の横鉄筋の端部１３ａとの上下方向の位置が同じである（図５参照）。また、重ね継手が形成されている接合構造Ｃ１では、横鉄筋１３の端部１３ａと横鉄筋の端部１３ｂの端部とが、水平方向に鉄筋径の分だけずれている（図４参照）。接合構造Ｃ１における一対の接合片９間に形成された空間ＳＰ内には、モルタル、コンクリート（間詰めコンクリート）等の充填材８が充填されている。 FIG. 4 is a horizontal sectional view showing two precast members 1 in a state of being joined to each other. FIG. 5 is a cross-sectional view in which two precast members 1 in a state of being joined to each other are vertically cut along the connecting direction. As shown in FIG. 4, in the two precast members 1 joined to the left and right, the joint portion 7 on the other side in the continuous connection direction of one precast member 1 and one side in the continuous connection direction in the other precast member 1. A joint structure C1 is formed in which the joint portion 5 of the above is joined. In this joint structure C1, the joint surface 5a of the joint portion 5 and the joint surface 7a of the joint portion 7 are in contact with each other. In this state, the end portion (end portion 13a and the vertical reinforcing bar 15 connected to the end portion 13a) of the main bar 11 protruding from the joint portion 5 is arranged in the space SP formed between the pair of joint pieces 9 in the joint portion 7. Will be done. Further, in the joint structure C1, the end 13b of the horizontal reinforcing bar 13 in one precast member 1 and the end 13a of the horizontal reinforcing bar in the other precast member 1 overlap each other in the continuous direction and extend. That is, in this overlapping portion, the end portion 13a and the end portion 13b are arranged adjacent to each other in any direction (horizontal direction in the present embodiment) orthogonal to the continuous installation direction. A lap joint is formed by the adjacent ends 13a and 13b. In the present embodiment, the vertical positions of the end 13b of one horizontal reinforcing bar 13 and the end 13a of the other horizontal reinforcing bar 13 are the same (see FIG. 5). Further, in the joint structure C1 in which the lap joint is formed, the end portion 13a of the horizontal reinforcing bar 13 and the end portion of the end portion 13b of the horizontal reinforcing bar are displaced in the horizontal direction by the diameter of the reinforcing bar (see FIG. 4). .. The space SP formed between the pair of joint pieces 9 in the joint structure C1 is filled with a filler 8 such as mortar and concrete (stitched concrete).

また、図５に示されるように、上下方向に接合されるプレキャスト部材１では、互いの左右方向（連設方向）の位置が揃うように、下側のプレキャスト部材１に上側のプレキャスト部材１が載置される。この状態では、上側のプレキャスト部材１における縦鉄筋１５の下端１５ａが、下側のプレキャスト部材１の上部に埋設されたシース６内に納まっている。シース６内では、縦鉄筋１５同士が上下方向に所定距離だけ重複している。なお、シース６内には、例えばモルタルが充填されている。 Further, as shown in FIG. 5, in the precast member 1 joined in the vertical direction, the upper precast member 1 is attached to the lower precast member 1 so that the positions in the left-right direction (continuous installation direction) are aligned with each other. It will be placed. In this state, the lower end 15a of the vertical reinforcing bar 15 in the upper precast member 1 is housed in the sheath 6 embedded in the upper part of the lower precast member 1. In the sheath 6, the vertical reinforcing bars 15 overlap each other by a predetermined distance in the vertical direction. The sheath 6 is filled with, for example, mortar.

上記のプレキャスト部材の接合構造を形成する接合方法について、図１のように既設のプレキャスト部材１の上に別のプレキャスト部材１を配置する場合を例として説明する。図示例では、水平方向の一方側に配置されたプレキャスト部材１Ａと下段に配置されたプレキャスト部材１Ｂとに対して新たなプレキャスト部材１Ｃが接合されている。 The joining method for forming the joining structure of the precast member will be described by taking as an example a case where another precast member 1 is arranged on the existing precast member 1 as shown in FIG. In the illustrated example, a new precast member 1C is joined to the precast member 1A arranged on one side in the horizontal direction and the precast member 1B arranged in the lower stage.

接合の工程では、まず、新たなプレキャスト部材１Ｃが既設のプレキャスト部材１上の所定の位置に鉛直に吊り込まれる。本実施形態では、下段に配置されたプレキャスト部材１Ｂに対して左右方向の位置が揃うように、下段のプレキャスト部材１Ｂの上方に吊り上げられたプレキャスト部材１Ｃが下方に垂直に移動される。このとき、下段のプレキャスト部材１Ｂにおけるシース６内には予めモルタルが充填されている。そのため、新たなプレキャスト部材１Ｃが下段のプレキャスト部材１Ｂ上に配置されると、図５に示されるように、上側のプレキャスト部材１Ｃにおける縦鉄筋１５の下端１５ａが、下側のプレキャスト部材１Ｂにおけるシース６内のモルタルに挿入される。 In the joining process, first, a new precast member 1C is vertically suspended at a predetermined position on the existing precast member 1. In the present embodiment, the precast member 1C suspended above the lower precast member 1B is vertically moved downward so that the positions in the left-right direction are aligned with respect to the precast member 1B arranged in the lower stage. At this time, the sheath 6 in the lower precast member 1B is pre-filled with mortar. Therefore, when a new precast member 1C is arranged on the lower precast member 1B, as shown in FIG. 5, the lower end 15a of the vertical reinforcing bar 15 in the upper precast member 1C becomes a sheath in the lower precast member 1B. It is inserted into the mortar in 6.

また、この状態では、図４及び５に示されるように、水平方向の一方側に配置されたプレキャスト部材１Ａの接合面７ａと、新たに配置されたプレキャスト部材１Ｃの接合面５ａとが当接されている。また、水平方向の一方側に配置されたプレキャスト部材１Ａの他方側の接合部７に露出した横鉄筋１３の端部１３ｂと、新たに配置されたプレキャスト部材１Ｃから突出した横鉄筋１３の端部１３ａとが、連設方向において互いに重複して重ね継手を構成している。プレキャスト部材１Ｃにおける横鉄筋１３の端部１３ａとプレキャスト部材１Ａにおける横鉄筋１３の端部１３ｂとは、連設方向に直交する水平方向において横鉄筋１３の径以下の距離で互いに隣接して配置される。 Further, in this state, as shown in FIGS. 4 and 5, the joint surface 7a of the precast member 1A arranged on one side in the horizontal direction and the joint surface 5a of the newly arranged precast member 1C are in contact with each other. Has been done. Further, the end portion 13b of the horizontal reinforcing bar 13 exposed at the joint portion 7 on the other side of the precast member 1A arranged on one side in the horizontal direction, and the end portion of the horizontal reinforcing bar 13 protruding from the newly arranged precast member 1C. 13a and 13a overlap each other in the continuous installation direction to form a lap joint. The end 13a of the horizontal reinforcing bar 13 in the precast member 1C and the end 13b of the horizontal reinforcing bar 13 in the precast member 1A are arranged adjacent to each other at a distance equal to or less than the diameter of the horizontal reinforcing bar 13 in the horizontal direction orthogonal to the continuous installation direction. To.

続いて、連設方向に隣接するプレキャスト部材１Ａ，１Ｃ同士の仮接合及び転倒防止の措置を講じ、一対の接合片９間に形成された空間ＳＰ内に、モルタル、コンクリート等の充填材８を打設する。打設された充填材８の強度が発現した後に仮接合及び転倒防止の措置が解除されることによって、複数のプレキャスト部材１が接合された鉄筋コンクリート構造物が構築される。 Subsequently, measures are taken to temporarily join the precast members 1A and 1C adjacent to each other in the continuous installation direction and to prevent them from tipping over, and a filler 8 such as mortar or concrete is placed in the space SP formed between the pair of joint pieces 9. Place. After the strength of the cast filler 8 is developed, the temporary joining and the fall prevention measures are released, so that a reinforced concrete structure in which a plurality of precast members 1 are joined is constructed.

以上説明したコンクリート構造物としてのプレキャスト部材１の接合構造Ｃ１によれば、予めプレキャスト部材１に主筋１１が埋設されているため、プレキャスト部材１を設置した後に別途主筋１１を配設する必要がない。そして、プレキャスト部材１Ｃを上方から下方に垂直に移動させるという比較的単純な動作によって、プレキャスト部材１Ｃとプレキャスト部材１Ａとの接合面５ａ，７ａ同士を互いに当接させることができる。プレキャスト部材１Ｃとプレキャスト部材１Ａとの接合面５ａ，７ａ同士が互いに当接された状態で、横鉄筋１３の端部１３ａ，１３ｂ同士が連設方向に重複している。これにより、横鉄筋１３同士は、いわゆる重ね継手によって接合されることになり、別途横鉄筋１３同士を接合する必要がない。したがって、施工の手間を低減することができる。 According to the joint structure C1 of the precast member 1 as the concrete structure described above, since the main bar 11 is embedded in the precast member 1 in advance, it is not necessary to separately dispose the main bar 11 after installing the precast member 1. .. Then, the joint surfaces 5a and 7a of the precast member 1C and the precast member 1A can be brought into contact with each other by a relatively simple operation of vertically moving the precast member 1C from the upper side to the lower side. In a state where the joint surfaces 5a and 7a of the precast member 1C and the precast member 1A are in contact with each other, the ends 13a and 13b of the horizontal reinforcing bars 13 overlap each other in the continuous installation direction. As a result, the horizontal reinforcing bars 13 are joined by so-called lap joints, and it is not necessary to separately join the horizontal reinforcing bars 13 to each other. Therefore, the labor of construction can be reduced.

また、本実施形態では、一方のプレキャスト部材１Ｃにおける横鉄筋１３の端部１３ａと他方のプレキャスト部材１Ａにおける横鉄筋１３の端部１３ｂとは、連設方向に直交する方向において横鉄筋１３の径以下の距離で互いに隣接して配置されている構成となっている。この場合、横鉄筋１３同士が近接又は接触されていることにより、端部１３ａ，１３ｂの横鉄筋１３同士の重複した部分が重ね継手として有効に機能する。 Further, in the present embodiment, the end portion 13a of the horizontal reinforcing bar 13 in one precast member 1C and the end portion 13b of the horizontal reinforcing bar 13 in the other precast member 1A have the diameter of the horizontal reinforcing bar 13 in a direction orthogonal to the continuous installation direction. They are arranged adjacent to each other at the following distances. In this case, since the horizontal reinforcing bars 13 are close to each other or in contact with each other, the overlapping portions of the horizontal reinforcing bars 13 at the ends 13a and 13b function effectively as a lap joint.

（第２実施形態）
本実施形態のコンクリート構造物は、プレキャスト型枠１０１である。このプレキャスト型枠１０１では、離間して対向配置されたプレキャスト型枠１０１間にコンクリート等が打設されることによって、擁壁、竪壁、壁高欄等の鉄筋コンクリート構造物が構築される。以下、プレキャスト型枠１０１の構造、及び、互いに接合された複数のプレキャスト型枠１０１の接合構造Ｃ２について、主として第１実施形態と相違する点について説明し、同一の要素や部材については同一の符号を付して詳しい説明は省略する。なお、以下の説明では、水平方向のうち、プレキャスト型枠１０１が連設される方向を連設方向とし、この連設方向に直交する方向をプレキャスト型枠１０１の幅方向とする。また、対向配置されるプレキャスト型枠１０１同士の対向する側を内側とし、内側の反対側を外側とする。 (Second Embodiment)
The concrete structure of this embodiment is a precast formwork 101. In the precast formwork 101, reinforced concrete structures such as retaining walls, vertical walls, and wall balustrades are constructed by placing concrete or the like between the precast formwork 101s arranged so as to face each other. Hereinafter, the structure of the precast formwork 101 and the joining structure C2 of a plurality of precast formwork 101s joined to each other will be described mainly on differences from the first embodiment, and the same elements and members will have the same reference numerals. A detailed description will be omitted. In the following description, of the horizontal directions, the direction in which the precast formwork 101 is continuously provided is defined as the continuous connection direction, and the direction orthogonal to the continuous connection direction is defined as the width direction of the precast formwork 101. Further, the opposite side of the precast formwork 101s arranged facing each other is the inner side, and the opposite side of the inner side is the outer side.

図６は、プレキャスト型枠１０１の水平方向の断面図である。また、図７は、プレキャスト型枠１０１を連設方向に直交する方向に切断した断面図である。図６、７に示されるように、プレキャスト型枠１０１は、略直方体形状の型枠本体１０３と、型枠本体１０３に埋設された主筋１１１及びせん断補強鉄筋１１７とを有している。 FIG. 6 is a cross-sectional view of the precast formwork 101 in the horizontal direction. Further, FIG. 7 is a cross-sectional view of the precast form 101 cut in a direction orthogonal to the continuous installation direction. As shown in FIGS. 6 and 7, the precast formwork 101 has a formwork body 103 having a substantially rectangular parallelepiped shape, a main bar 111 embedded in the formwork body 103, and a shear reinforcing reinforcing bar 117.

型枠本体１０３は、コンクリートによって形成されており、連設方向の一方の端部に接合面（第１の接合面）１０５ａを有した接合部（第１の接合部）１０５が形成され、他方の端部に接合面（第２の接合面）１０７ａを有した接合部（第２の接合部）１０７が形成されている。一方の接合部１０５では、端面が連設方向に直交する平面となっており、これによって接合面１０５ａが形成されている。また、他方の接合部１０７では、幅方向の外側のみに接合面１０７ａが形成されている。図示例の接合部１０７は、型枠本体１０３から連設方向に突出する接合片１０９を有している。接合片１０９は、型枠本体１０３の幅方向外側の端部１０３ａから内側に所定の厚みを有している。また、接合片１０９は、型枠本体１０３の上端から下端まで延在している。また、接合片１０９の連設方向の端面によって接合面１０７ａが形成されている。なお、接合片１０９はコンクリートによって型枠本体１０３と一体的に形成されている。 The formwork body 103 is formed of concrete, and a joint portion (first joint portion) 105 having a joint surface (first joint surface) 105a is formed at one end in the continuous installation direction, and the other. A joint portion (second joint portion) 107 having a joint surface (second joint surface) 107a is formed at the end portion of the joint. On the other hand, the joint portion 105 has an end surface that is a plane orthogonal to the continuous installation direction, whereby the joint surface 105a is formed. Further, in the other joint portion 107, the joint surface 107a is formed only on the outer side in the width direction. The joint portion 107 of the illustrated example has a joint piece 109 projecting from the mold body 103 in the continuous installation direction. The joint piece 109 has a predetermined thickness inward from the outer end portion 103a in the width direction of the form main body 103. Further, the joint piece 109 extends from the upper end to the lower end of the form main body 103. Further, the joint surface 107a is formed by the end faces of the joint pieces 109 in the continuous installation direction. The joint piece 109 is integrally formed with the formwork body 103 by concrete.

主筋１１１は、型枠本体１０３内に埋設されており、連設方向に沿って水平に延在する横鉄筋１１３と、横鉄筋１１３に直交して略鉛直方向に延在する縦鉄筋１１５とを有している。横鉄筋１１３は、鉛直方向に所定の間隔で複数配置されている。一方の接合部１０５では、横鉄筋１１３の端部１１３ａが接合面１０５ａから突出している。横鉄筋１１３の端部１１３ａは、第１実施形態（例えば図３参照）と同様に、半円形のループ形状であり、上下に隣接する２本の横鉄筋１１３から延在している。横鉄筋１１３における接合面１０５ａから突出している部分の連設方向の長さＬ３は、接合片１０９の連設方向の長さＬ４と略同じになっている。 The main reinforcing bar 111 is embedded in the formwork main body 103, and has a horizontal reinforcing bar 113 extending horizontally along the continuous installation direction and a vertical reinforcing bar 115 extending in a substantially vertical direction orthogonal to the horizontal reinforcing bar 113. Have. A plurality of horizontal reinforcing bars 113 are arranged at predetermined intervals in the vertical direction. In one joint portion 105, the end portion 113a of the horizontal reinforcing bar 113 protrudes from the joint surface 105a. Similar to the first embodiment (see, for example, FIG. 3), the end portion 113a of the horizontal reinforcing bar 113 has a semicircular loop shape and extends from two vertically adjacent horizontal reinforcing bars 113. The length L3 of the portion of the horizontal reinforcing bar 113 protruding from the joint surface 105a in the continuous connection direction is substantially the same as the length L4 of the joint piece 109 in the continuous connection direction.

また、他方の接合部１０７では、横鉄筋１１３の端部１１３ｂが、接合面１０７ａまで延在している。この端部１１３ｂも一方側と同様に半円形のループ形状であり、上下に隣接する２本の横鉄筋１１３から延在している。横鉄筋１１３の他方側の端部１１３ｂは、型枠本体１０３及び接合片１０９から露出しており、接合片１０９の内側面１０９ａに接している。すなわち、接合片１０９は、型枠本体１０３におけるかぶりコンクリートの延長となっている。横鉄筋１１３は、他方側の端部１１３ｂから一方側の端部１１３ａにかけてプレキャスト型枠１０１の幅方向内側に向かって傾くように配置されている。これにより、横鉄筋１１３における一方側の端部１１３ａは、他方側の端部１１３ｂに比べてプレキャスト型枠の幅方向内側に鉄筋径の分だけずれている。 Further, in the other joint portion 107, the end portion 113b of the horizontal reinforcing bar 113 extends to the joint surface 107a. The end portion 113b also has a semicircular loop shape as on one side, and extends from two horizontal reinforcing bars 113 adjacent to the top and bottom. The other end 113b of the horizontal reinforcing bar 113 is exposed from the formwork main body 103 and the joint piece 109, and is in contact with the inner side surface 109a of the joint piece 109. That is, the joint piece 109 is an extension of the cover concrete in the formwork body 103. The horizontal reinforcing bar 113 is arranged so as to be inclined inward in the width direction of the precast form 101 from the other end 113b to the one end 113a. As a result, the one-sided end 113a of the horizontal reinforcing bar 113 is displaced inward in the width direction of the precast formwork by the amount of the reinforcing bar diameter as compared with the other-side end 113b.

縦鉄筋１１５は、横鉄筋１１３に当接して、横鉄筋１１３よりも幅方向の内側に配置されている。本実施形態では、縦鉄筋１１５は、横鉄筋１１３のうち、型枠本体１０３に埋設された部分と、型枠本体１０３の連設方向の一方側に突出した端部１１３ａとに当接して配置されている。横鉄筋１１３と縦鉄筋１１５とは、例えば鉄線（番線）等によって互いに固定されている。縦鉄筋１１５の下端側１１５ａは、型枠本体１０３よりも下方に延在している。また、型枠本体１０３に埋設された縦鉄筋１１５の上端１１５ｂは、第１実施形態と同様に、型枠本体１０３の上部に埋設された筒状のシース６内に配置されている。 The vertical reinforcing bar 115 is in contact with the horizontal reinforcing bar 113 and is arranged inside the horizontal reinforcing bar 113 in the width direction. In the present embodiment, the vertical reinforcing bar 115 is arranged in contact with the portion of the horizontal reinforcing bar 113 embedded in the formwork main body 103 and the end portion 113a protruding on one side in the continuous connection direction of the formwork main body 103. Has been done. The horizontal reinforcing bar 113 and the vertical reinforcing bar 115 are fixed to each other by, for example, an iron wire (number line) or the like. The lower end side 115a of the vertical reinforcing bar 115 extends below the form main body 103. Further, the upper end 115b of the vertical reinforcing bar 115 embedded in the formwork body 103 is arranged in the tubular sheath 6 embedded in the upper part of the formwork body 103, as in the first embodiment.

せん断補強鉄筋１１７は、横鉄筋１１３に連結されており、型枠本体１０３の内側面１０３ｂから連設方向に直交する方向に水平に突出している。せん断補強鉄筋１１７における内側面１０３ｂから突出している部分の長さは、離間して対向配置される一対のプレキャスト型枠１０１間の間隔と略同じとなるように設計されている。図示例におけるせん断補強鉄筋１１７は、上下に隣接する２本の横鉄筋１１３に接合されたループ形状をなしており、内側面１０３ｂから突出した先端は半円形状となっている。また、せん断補強鉄筋１１７は、上下方向及び連設方向において所定の間隔で複数配置されている。図示例では、せん断補強鉄筋１１７は、横鉄筋１１３における型枠本体１０３に埋設された部分のみに連結されており、横鉄筋１１３の連設方向における両側の端部１１３ａ，１１３ｂには設けられていない。 The shear reinforcing reinforcing bar 117 is connected to the horizontal reinforcing bar 113, and projects horizontally from the inner side surface 103b of the formwork main body 103 in a direction orthogonal to the continuous installation direction. The length of the portion of the shear reinforcing bar 117 protruding from the inner surface 103b is designed to be substantially the same as the distance between the pair of precast formwork 101 arranged so as to face each other. The shear reinforcing reinforcing bar 117 in the illustrated example has a loop shape joined to two horizontal reinforcing bars 113 adjacent to the top and bottom, and the tip protruding from the inner side surface 103b has a semicircular shape. Further, a plurality of shear reinforcing bars 117 are arranged at predetermined intervals in the vertical direction and the continuous installation direction. In the illustrated example, the shear reinforcing reinforcing bars 117 are connected only to the portions of the horizontal reinforcing bars 113 embedded in the formwork body 103, and are provided at the ends 113a and 113b on both sides of the horizontal reinforcing bars 113 in the continuous installation direction. Absent.

図８は、互いに接合されている状態のプレキャスト型枠１０１を示す水平方向の断面図である。図９は、互いに接合されている状態のプレキャスト型枠１０１を連設方向と直交する方向に切断した鉛直方向の断面図である。図８に示されるように、本実施形態では、複数のプレキャスト型枠１０１が連設方向に互いに接合されている。また、このように接合された複数のプレキャスト型枠１０１は、同様に接合された複数のプレキャスト型枠１０１と対になるように連設方向に直交する方向に離間して対向配置される。 FIG. 8 is a horizontal sectional view showing the precast formwork 101 in a state of being joined to each other. FIG. 9 is a cross-sectional view in the vertical direction in which the precast formwork 101 in a state of being joined to each other is cut in a direction orthogonal to the continuous installation direction. As shown in FIG. 8, in the present embodiment, a plurality of precast formwork 101s are joined to each other in the continuous installation direction. Further, the plurality of precast formwork 101s joined in this way are arranged so as to be paired with the plurality of precast formwork 101s similarly joined so as to be separated from each other in a direction orthogonal to the continuous installation direction.

連設方向に接合された二つのプレキャスト型枠１０１では、一方のプレキャスト型枠１０１における接合部１０７と、他方のプレキャスト型枠１０１における接合部１０５とが接合されて、接合構造Ｃ２を形成している。この接合構造Ｃ２では、接合部１０５の接合面１０５ａと接合部１０７の接合面１０７ａとが互いに当接されている。この状態では、一方のプレキャスト型枠１０１における横鉄筋１１３の端部１１３ｂと、他方のプレキャスト型枠１０１における横鉄筋１１３の端部１１３ａとが連設方向において互いに重複して延在している。すなわち、この重複する部分では連設方向に直交する方向に端部１１３ａと端部１１３ｂとが隣接して配置されている。そして、端部１１３ａ，１１３ｂによって重ね継手が形成されている。また、第１実施形態と同様に、端部１１３ａと端部１１６ｂとでは、上下方向の位置が同じであり、端部１１３ａは端部１１３ｂに対して幅方向に鉄筋径の分だけずれている。幅方向に対向配置されたプレキャスト型枠１０１間には、充填材８が充填されている。 In the two precast formwork 101 joined in the continuous direction, the joint portion 107 in one precast formwork 101 and the joint portion 105 in the other precast formwork 101 are joined to form a joint structure C2. There is. In this joint structure C2, the joint surface 105a of the joint portion 105 and the joint surface 107a of the joint portion 107 are in contact with each other. In this state, the end 113b of the horizontal reinforcing bar 113 in one precast formwork 101 and the end 113a of the horizontal reinforcing bar 113 in the other precast formwork 101 overlap each other and extend in the continuous direction. That is, in this overlapping portion, the end portion 113a and the end portion 113b are arranged adjacent to each other in the direction orthogonal to the continuous installation direction. A lap joint is formed by the ends 113a and 113b. Further, as in the first embodiment, the end portion 113a and the end portion 116b have the same vertical position, and the end portion 113a is deviated from the end portion 113b by the reinforcing bar diameter in the width direction. .. Filler 8 is filled between the precast formwork 101 arranged to face each other in the width direction.

図８、図９に示されるように、幅方向に離間して対向配置されたプレキャスト型枠１０１同士では、せん断補強鉄筋１１７が対向するプレキャスト型枠１０１の内側面１０３ｂ側に突出している。幅方向の一方側のプレキャスト型枠１０１から突出したせん断補強鉄筋１１７と、他方側のプレキャスト型枠１０１から突出したせん断補強鉄筋１１７とは、連設方向に若干のずれ（例えば鉄筋径と同程度のずれ）を有して配置されている。これにより、せん断補強鉄筋１１７同士は、連設方向において重なり合うように配置されている。なお、プレキャスト型枠１０１（縦鉄筋１１５）の上下方向の接合に関しては、第１実施形態におけるプレキャスト部材１（縦鉄筋１５）の接合と同様であるため、その説明を省略する。 As shown in FIGS. 8 and 9, in the precast formwork 101s arranged so as to be separated from each other in the width direction, the shear reinforcing bars 117 project toward the inner side surface 103b side of the precast formwork 101 facing each other. The shear reinforcing bar 117 protruding from the precast formwork 101 on one side in the width direction and the shear reinforcing bar 117 protruding from the precast formwork 101 on the other side are slightly displaced in the continuous installation direction (for example, about the same as the diameter of the reinforcing bar). It is arranged with a deviation). As a result, the shear reinforcing bars 117 are arranged so as to overlap each other in the continuous installation direction. Since the joining of the precast formwork 101 (vertical reinforcing bar 115) in the vertical direction is the same as the joining of the precast member 1 (vertical reinforcing bar 15) in the first embodiment, the description thereof will be omitted.

上記のプレキャスト型枠１０１の接合構造Ｃ２を形成する接合方法は、第１実施形態におけるプレキャスト部材１の接合方法と略同じであるが、幅方向に対向するようにプレキャスト型枠１０１を配置する点で相違している。すなわち、接合の工程では、まず、第１実施形態と同様に、新たなプレキャスト型枠１０１が既設のプレキャスト型枠１０１上の所定の位置に鉛直に吊り込まれる。この状態では、図８に示されるように、連設方向の一方側に配置されたプレキャスト型枠１０１Ａの接合面１０７ａと、新たに配置されたプレキャスト型枠１０１Ｃの接合面１０５ａとが当接されている。また、プレキャスト型枠１０１Ａの接合部１０７に露出した横鉄筋１１３の端部１１３ｂと、新たに配置されたプレキャスト型枠１０１Ｃから突出した横鉄筋１１３の端部１１３ａとが、連設方向において互いに重複して重ね継手を構成している。プレキャスト型枠１０１Ｃにおける横鉄筋１１３の端部１１３ａとプレキャスト型枠１０１Ａにおける横鉄筋１１３の端部１１３ｂとは、連設方向に直交する水平方向において横鉄筋１１３の径以下の距離で互いに隣接して配置される。 The joining method for forming the joining structure C2 of the precast formwork 101 is substantially the same as the joining method for the precast member 1 in the first embodiment, but the precast formwork 101 is arranged so as to face each other in the width direction. Is different. That is, in the joining step, first, as in the first embodiment, the new precast form 101 is vertically suspended at a predetermined position on the existing precast form 101. In this state, as shown in FIG. 8, the joint surface 107a of the precast formwork 101A arranged on one side in the continuous installation direction and the joint surface 105a of the newly arranged precast formwork 101C are in contact with each other. ing. Further, the end portion 113b of the horizontal reinforcing bar 113 exposed at the joint portion 107 of the precast formwork 101A and the end portion 113a of the horizontal reinforcing bar 113 protruding from the newly arranged precast formwork 101C overlap each other in the continuous installation direction. To form a lap joint. The end 113a of the horizontal reinforcing bar 113 in the precast formwork 101C and the end 113b of the horizontal reinforcing bar 113 in the precast formwork 101A are adjacent to each other at a distance equal to or less than the diameter of the horizontal reinforcing bar 113 in the horizontal direction orthogonal to the continuous installation direction. Be placed.

そして、本実施形態では、配置されたプレキャスト型枠１０１の幅方向に離間して対向するように、別途、複数のプレキャスト型枠１０１が接合されるように配置される。対向するプレキャスト型枠１０１同士では、互いのせん断補強鉄筋１１７が連設方向にずれて接触しない位置関係になっている。そのため、プレキャスト型枠１０１を鉛直方向の上方から下方に移動させることによって、所定の位置に配置することができる。これにより、連設方向に接合された複数のプレキャスト型枠１０１が幅方向に離間して対向配置される。 Then, in the present embodiment, a plurality of precast formwork 101s are separately arranged so as to be joined so as to be separated from each other in the width direction of the arranged precast formwork 101s. The precast formwork 101 facing each other are in a positional relationship in which the shear reinforcing bars 117 are displaced from each other in the continuous installation direction and do not come into contact with each other. Therefore, the precast form 101 can be arranged at a predetermined position by moving it from above to below in the vertical direction. As a result, the plurality of precast formwork 101 joined in the continuous installation direction are arranged so as to face each other apart in the width direction.

続いて、プレキャスト型枠１０１同士の仮接合及び転倒防止の措置を講じ、幅方向に対向配置されたプレキャスト型枠１０１間に、充填材８を打設する。打設された充填材８の強度が発現した後に仮接合及び転倒防止の措置が解除されることによって、複数のプレキャスト型枠１０１が接合された鉄筋コンクリート構造物が構築される。 Subsequently, measures are taken to temporarily join the precast formwork 101 to each other and prevent them from tipping over, and the filler 8 is placed between the precast formwork 101 arranged to face each other in the width direction. After the strength of the cast filler 8 is developed, the temporary joining and the fall prevention measures are released, so that a reinforced concrete structure in which a plurality of precast formwork 101 are joined is constructed.

以上のようなプレキャスト型枠１０１では、連設方向と直交する方向に突出するせん断補強鉄筋１１７が形成されている。そして、せん断補強鉄筋１１７は、離間して配置されたプレキャスト型枠１０１間に配置されている。この構成によれば、プレキャスト型枠１０１を設置した後に、別途せん断補強鉄筋を配設する必要がない。 In the precast formwork 101 as described above, a shear reinforcing bar 117 projecting in a direction orthogonal to the continuous installation direction is formed. The shear reinforcing bars 117 are arranged between the precast formwork 101 arranged apart from each other. According to this configuration, it is not necessary to separately dispose the shear reinforcing bars after installing the precast formwork 101.

また、離間して配置される一方側のプレキャスト型枠１０１から突出するせん断補強鉄筋１１７と他方側のプレキャスト型枠１０１から突出するせん断補強鉄筋１１７とが、連設方向にせん断補強鉄筋１１７の径以下の距離で互いに隣接して配置されている。この構成によれば、近接又は接触されているせん断補強鉄筋１１７同士が重ね継手として有効に機能する。 Further, the shear reinforcing bars 117 protruding from the precast formwork 101 on one side and the shearing reinforcing bars 117 protruding from the precast formwork 101 on the other side are arranged apart from each other, and the diameters of the shear reinforcing bars 117 project in the continuous installation direction. They are placed adjacent to each other at the following distances. According to this configuration, the shear reinforcing bars 117 that are in close proximity or in contact with each other function effectively as a lap joint.

以上、本発明の実施の形態について図面を参照して詳述したが、具体的な構成はこの実施形態に限られるものではない。例えば、横鉄筋１３の端部１３ｂが第２の接合面７ａまで延在している例を示したが、これに限定されない。横鉄筋の端部は、隣接する他のコンクリート構造物における横鉄筋の端部と連設方向に所定距離重複し得る形態であればよく（例えば、第１実施形態では端部１３ａと端部１３ｂとが重複している）、例えば、接合面よりも手前の位置まで延在する形態でもよい。 Although the embodiment of the present invention has been described in detail with reference to the drawings, the specific configuration is not limited to this embodiment. For example, an example is shown in which the end portion 13b of the horizontal reinforcing bar 13 extends to the second joint surface 7a, but the present invention is not limited to this. The end portion of the horizontal reinforcing bar may be in a form that can overlap with the end portion of the horizontal reinforcing bar in another adjacent concrete structure by a predetermined distance in the continuous installation direction (for example, in the first embodiment, the end portion 13a and the end portion 13b). ), For example, it may extend to a position in front of the joint surface.

また、せん断補強鉄筋１１７が横鉄筋１１３における型枠本体１０３に埋設された部分のみに連結されている形態を示したが、これに限定されない。例えば、せん断補強鉄筋は、第１の接合部における第１の接合面から突出した横鉄筋の端部１３ａ，１１３ａにも連結されてよい。 Further, although the shear reinforcing bar 117 is connected only to the portion of the horizontal reinforcing bar 113 embedded in the formwork body 103, the present invention is not limited to this. For example, the shear reinforcing bar may also be connected to the ends 13a, 113a of the horizontal reinforcing bar protruding from the first joint surface at the first joint.

また、横鉄筋１３の端部１１３ａ，１１３ｂ及びせん断補強鉄筋１１７の先端部が、半円形状のループ状に形成されている例を示したが、これに限定されない。横鉄筋の端部及びせん断補強鉄筋の先端部は、互いに重複する他の鉄筋と重ね継手を形成できればよく、例えば、先端が半円形状に湾曲した半円形フックや、先端に定着プレートが設けられたタイプでもよい。 Further, an example is shown in which the ends 113a and 113b of the horizontal reinforcing bars 13 and the tips of the shear reinforcing bars 117 are formed in a semicircular loop shape, but the present invention is not limited to this. The end of the horizontal reinforcing bar and the tip of the shear reinforcing bar need only be able to form a lap joint with other reinforcing bars that overlap each other. For example, a semicircular hook having a curved tip or a fixing plate at the tip is provided. It may be a type.

また、せん断補強鉄筋としてループ状に加工したものを代表例として示したが、場所打ち部の空間が狭いなど、せん断補強鉄筋の重ね継手長が十分に取れない場合には、せん断補強鉄筋の端部を水平面においてＬ型に曲げ加工することも可能である。 In addition, a loop-shaped shear reinforcing bar is shown as a typical example, but if the lap joint length of the shear reinforcing bar is not sufficient, such as when the space of the cast-in-place portion is narrow, the end of the shear reinforcing bar is shown. It is also possible to bend the portion into an L shape on a horizontal surface.

また、プレキャスト型枠１０１のせん断補強鉄筋１１７が予め横鉄筋１１３に連結されている例を示したが、これに限定されない。例えば、プレキャスト型枠にアンカー部材のみ埋設されている形態でもよい。この場合、現場での設置作業よりも前の段階でアンカー部材に対してせん断補強鉄筋が接合される。 Further, the example in which the shear reinforcing bar 117 of the precast form 101 is connected to the horizontal reinforcing bar 113 in advance is shown, but the present invention is not limited to this. For example, only the anchor member may be embedded in the precast formwork. In this case, the shear reinforcing bar is joined to the anchor member at a stage prior to the on-site installation work.

また、プレキャスト部材１の接合部７に一対の接合片９が形成されている例を示したが、これに限定されない。例えば、プレキャスト部材の連設方向の両端部にそれぞれ１つずつ接合片が形成される構成でもよい。このような構成であっても、一対のプレキャスト部材が接合された場合には、一方のプレキャスト部材の接合片と他方のプレキャスト部材の接合片とによって一対の接合片が形成される。 Further, an example in which a pair of joint pieces 9 are formed at the joint portion 7 of the precast member 1 is shown, but the present invention is not limited to this. For example, one joint piece may be formed at each end of the precast member in the continuous installation direction. Even with such a configuration, when a pair of precast members are joined, a pair of joint pieces is formed by the joint piece of one precast member and the joint piece of the other precast member.

また、例えば、プレキャスト部材１Ｃにおける横鉄筋１３の端部１３ａとプレキャスト部材１Ａにおける横鉄筋１３の端部１３ｂとが、水平方向において互いに隣接して配置される例を示したが、これに限定されない。接合される一対のコンクリート構造物における一方のコンクリート構造物の横鉄筋と、他方のコンクリート構造物の横鉄筋とは、連設方向に所定距離重複していればよく、例えば、鉛直方向にずれて配置されてもよい。 Further, for example, an example is shown in which the end portion 13a of the horizontal reinforcing bar 13 in the precast member 1C and the end portion 13b of the horizontal reinforcing bar 13 in the precast member 1A are arranged adjacent to each other in the horizontal direction, but the present invention is not limited thereto. .. The horizontal reinforcing bars of one concrete structure and the horizontal reinforcing bars of the other concrete structure in the pair of concrete structures to be joined need only overlap by a predetermined distance in the continuous installation direction, for example, they are displaced in the vertical direction. It may be arranged.

また、図８では、幅方向に対向するプレキャスト型枠１０１同士が平面視において点対称となるように配置されているが、例えば、幅方向に対向するプレキャスト型枠同士が連設方向に沿った線を中心線として平面視において線対称となるように配置されてもよい。 Further, in FIG. 8, the precast formwork 101s facing each other in the width direction are arranged so as to be point-symmetrical in a plan view. For example, the precast formworkes facing each other in the width direction are arranged along the continuous arrangement direction. It may be arranged so as to be line-symmetrical in a plan view with the line as the center line.

１…プレキャスト部材（コンクリート構造物）、３…部材本体、５，１０５…第１の接合部、５ａ，１０５ａ…第１の接合面、６…シース、７，１０７…第２の接合部、７ａ，１０７ａ…第２の接合面、８…充填材（コンクリート）、９，１０９…接合片、１１，１１１…主筋、１３，１１３…横鉄筋（主筋）、１３ａ，１３ｂ，１１３ａ，１１３ｂ…端部、１５，１１５…縦鉄筋（主筋）、１５ａ…縦鉄筋の下端、１０１（１０１Ａ，１０１Ｃ）…プレキャスト型枠（コンクリート構造物）、１０３…型枠本体、１１７…せん断補強鉄筋、Ｃ１，Ｃ２…接合構造、Ｄ１，Ｄ２…横鉄筋の幅方向の間隔、Ｌ１〜Ｌ４…横鉄筋の重ね長、ＳＰ…空間。
1 ... Precast member (concrete structure), 3 ... Member body, 5,105 ... First joint, 5a, 105a ... First joint surface, 6 ... Sheath, 7,107 ... Second joint, 7a , 107a ... Second joint surface, 8 ... Filler (concrete), 9,109 ... Joint piece, 11,111 ... Main bar, 13,113 ... Horizontal reinforcing bar (main bar), 13a, 13b, 113a, 113b ... End , 15, 115 ... Vertical reinforcing bars (main reinforcing bars), 15a ... Lower end of vertical reinforcing bars, 101 (101A, 101C) ... Precast formwork (concrete structure), 103 ... Formwork body 117 ... Shear reinforcing bars, C1, C2 ... Joining structure, D1, D2 ... Spacing in the width direction of the horizontal reinforcing bars, L1 to L4 ... Overlapping length of the horizontal reinforcing bars, SP ... Space.

Claims

It is a joint structure of multiple concrete structures that are joined to each other to form a wall structure.
In the concrete structure, a main bar extending along the continuous direction along the horizontal direction is embedded.
One concrete structure joined to each other in the continuous direction includes a first joint having a first joint surface joined to the other concrete structure.
The other concrete structure comprises a second joint having a second joint surface to be joined to the one concrete structure.
The second joint includes a joint piece protruding from the other concrete structure along the continuous direction.
The second joint surface is an end surface of the joint piece in the continuous direction.
In the first joint, the end of the main bar projects toward the other concrete structure from the first joint surface.
In the second joint, the end of the main bar extends to the second joint surface or to a position in front of the second joint surface and is exposed from the joint piece.
The end of the main bar on the first joint surface and the end of the main bar on the second joint surface overlap by a predetermined distance in the continuous direction .
The concrete structures are arranged so as to be paired with each other separated in the horizontal direction orthogonal to the continuous installation direction.
A joint structure of concrete structures in which concrete or mortar is filled between the separated concrete structures.

The distance between the end of the main bar on the first joint surface and the end of the main bar on the second joint surface is equal to or less than the diameter of the main bar in the radial direction of the main bar orthogonal to the continuous direction. The joint structure of the concrete structure according to claim 1, which is arranged adjacent to each other.

A pair of the main bars are embedded in the concrete structure.
The joint structure of a concrete structure according to claim 1 or 2, wherein the pair of main bars are arranged so as to face each other in a horizontal direction orthogonal to the continuous installation direction.

The concrete structure is formed with shear reinforcing bars protruding in the horizontal direction orthogonal to the continuous installation direction.
The joint structure of a concrete structure according to any one of claims 1 to 3, wherein the shear reinforcing bars are arranged between the concrete structures arranged apart from each other.

In the shear reinforcing bar, the shear reinforcing bar protruding from the concrete structure on one side and the shear reinforcing bar protruding from the concrete structure on the other side, which are arranged apart from each other, are arranged in the continuous direction. The joint structure of the concrete structure according to claim 4 , which is arranged adjacent to each other at a distance equal to or less than the diameter of the above.

It is a joint structure of multiple concrete structures that are joined to each other to form a wall structure.
In the concrete structure, a main bar extending along the continuous direction along the horizontal direction is embedded.
One concrete structure joined to each other in the continuous direction includes a first joint having a first joint surface joined to the other concrete structure.
The other concrete structure comprises a second joint having a second joint surface to be joined to the one concrete structure.
The second joint includes a joint piece protruding from the other concrete structure along the continuous direction.
The second joint surface is an end surface of the joint piece in the continuous direction.
In the first joint, the end of the main bar projects toward the other concrete structure from the first joint surface.
In the second joint, the end of the main bar extends to the second joint surface or to a position in front of the second joint surface and is exposed from the joint piece.
The end of the main bar on the first joint surface and the end of the main bar on the second joint surface overlap by a predetermined distance in the continuous direction.
The joint pieces are formed in pairs at the second joint portion of the other concrete structure, separated in the horizontal direction orthogonal to the continuous connection direction.
A joint structure of a concrete structure in which concrete or mortar is filled between the pair of joint pieces arranged apart from each other.

It is a joining method of concrete structures that joins one concrete structure and the other concrete structure along the continuous installation direction along the horizontal direction.
The one concrete structure includes a main bar extending in the continuous direction and an end portion of the main bar protruding from the first joint surface formed in the continuous direction.
The other concrete structure includes a main bar extending along the continuous connection direction, a joint piece protruding from the other concrete structure along the continuous connection direction, and a joint piece in the continuous connection direction. It extends to a second joint surface, which is an end surface , or to a position in front of the second joint surface, and is provided with an end portion of the main bar exposed from the other concrete structure.
The joining method is
With either one of the one concrete structure and the other concrete structure installed, one of the one concrete structure and the other concrete structure is vertically moved from the upper side to the lower side. By causing the one concrete structure and the other concrete structure to be adjacent to each other in the continuous installation direction, the ends of the main bars of the one concrete structure and the other concrete structure are adjacent to each other. However, in the step of arranging the first joint surface and the second joint surface so as to be in contact with each other while overlapping by a predetermined distance in the continuous installation direction.
A horizontal direction orthogonal to the continuous installation direction, using the one concrete structure and the other concrete structure arranged so that the first joint surface and the second joint surface are in contact with each other as a formwork. A method for joining concrete structures , which comprises a step of arranging the formwork in pairs so as to be separated from each other and filling concrete or mortar between the formwork arranged apart from each other.

In the step, the ends of the main bars of the one concrete structure and the other concrete structure are adjacent to each other at a distance equal to or less than the diameter of the main bars in the radial direction of the main bars orthogonal to the continuous installation direction. 7. The method for joining concrete structures according to claim 7.