JP2008223370A - Rigidly connecting structure of corner part - Google Patents

Rigidly connecting structure of corner part Download PDF

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Publication number
JP2008223370A
JP2008223370A JP2007064371A JP2007064371A JP2008223370A JP 2008223370 A JP2008223370 A JP 2008223370A JP 2007064371 A JP2007064371 A JP 2007064371A JP 2007064371 A JP2007064371 A JP 2007064371A JP 2008223370 A JP2008223370 A JP 2008223370A
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reinforcing bar
vertical wall
rebar
corner
concrete
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JP4877654B2 (en
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Norio Asami
則雄 浅見
Terumasa Osawa
照正 大澤
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HANEDA CONCRETE IND CO Ltd
Haneda Concrete Industrial Co Ltd
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HANEDA CONCRETE IND CO Ltd
Haneda Concrete Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a rigidly connecting structure of a corner part capable of resisting load stably even when offset load acts. <P>SOLUTION: This rigidly connecting structure of the corner part 1A is composed of upper ends of vertical wall parts 11 provided on both sides in the direction of width and side ends of a pile cap part 3 constituted by a form member 4 made of precast concrete and stretched over between upper end parts of the vertical wall parts 11 and a concrete placed part 5 formed by placing concrete on the form member 4. The vertical wall part 11 is provided with a hook bar 29 at the upper end, and the form member 4 is provided with an upper part reinforcing bar 23 resisting the bending moment M1 generated in the corner part 1A integrally. One end of the upper part reinforcing bar 23 is buried in the form member 4, and the upper part reinforcing bar 23 is engaged with a length reinforcing bar 30 arranged in the hook bar 29. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

本発明は、プレキャストコンクリート部材と現場打ちコンクリートとを組み合わせて構築され、ボックスカルバートや橋梁などに用いることができる隅角部の剛結構造に関するものである。   The present invention relates to a rigid connection structure at a corner that is constructed by combining a precast concrete member and a cast-in-place concrete and can be used for a box culvert or a bridge.

隅角部の剛結構造を用いたボックスカルバートや橋梁などのコンクリート構造体として、現場で型枠を組んでコンクリートを打設する現場施工によるもの、ボックス形状に形成したプレキャスト製品を現場で組み立てるもの、プレキャスト部材と現場打ちコンクリートとを組み合わせて構築するものがある。   As a concrete structure such as a box culvert or bridge using a rigid structure at the corner, it is constructed by on-site construction by placing a formwork on the site, and a precast product formed in a box shape is assembled on-site Some are constructed by combining precast members and cast-in-place concrete.

上記プレキャスト部材と現場打ちコンクリートとを組み合わせて構築する組み立て構造物として、幅方向両側に設けられ下部に自立脚部を一体に有するプレキャストコンクリート製の側壁部材と、これら側壁部材の上部間に掛け渡されるプレキャストコンクリート製の型枠部材と、この型枠部材と該型枠部材上にコンクリートを打設して形成された打設コンクリート部とからなる頂版部とを備えたコンクリート組立構造体が開示されている(例えば、特許文献1)。この特許文献1には、前記側壁部材と打設コンクリート部とを挿通する斜鉄筋を備えることを特徴とするコンクリート組立構造体が記載されている。上記構成によれば、コンクリート組立構造体は、斜鉄筋を備えることにより、側壁部材と頂版部とを強固に一体化することができるという優れた効果を発揮するものである。
特開2005−61127号公報
As an assembly structure constructed by combining the precast member and the cast-in-place concrete, a side wall member made of precast concrete that is provided on both sides in the width direction and integrally has a self-supporting leg at the lower part, and spanned between the upper parts of these side wall members. A precast concrete formwork member, and a concrete assembly structure comprising a top plate part comprising the formwork member and a cast concrete part formed by placing concrete on the formwork member are disclosed. (For example, Patent Document 1). Patent Document 1 describes a concrete assembly structure including a diagonal reinforcing bar that passes through the side wall member and the cast concrete portion. According to the said structure, a concrete assembly structure exhibits the outstanding effect that a side wall member and a top plate part can be firmly integrated by providing a diagonal reinforcement.
JP 2005-61127 A

しかしながら、上記した特許文献1においても、頂版部下側鉄筋、側壁部の内側鉄筋及び斜鉄筋が十分に定着されていないことにより、地震時や不等沈下などによる偏荷重が作用した場合に、安定的して荷重に抵抗することができないという懸念があった。   However, even in the above-described Patent Document 1, when the top plate lower rebar, the side wall inner rebar and the oblique rebar are not sufficiently fixed, when an uneven load due to an earthquake or unequal subsidence acts, There was concern that the load could not be stably resisted.

そこで本発明は上記した問題点に鑑み、偏荷重が作用した場合でも、安定して荷重に抵抗することができる隅角部の剛結構造を提供することを目的とする。   In view of the above problems, an object of the present invention is to provide a rigid connection structure of a corner portion that can stably resist a load even when an unbalanced load is applied.

上記目的を達成するために、請求項1に係る発明は、幅方向両側に設けられた縦壁部の上端と、該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、前記縦壁部は、上端にフック筋を備え、前記型枠部材は、隅角部に生じる曲げモーメントに抵抗する上部鉄筋を一体的に設け、前記上部鉄筋の一端を前記型枠部材に埋設し、前記フック筋内に配筋される長さ鉄筋に前記上部鉄筋を係合することを特徴とする。   In order to achieve the above object, the invention according to claim 1 is characterized in that an upper end of a vertical wall portion provided on both sides in the width direction, and a precast concrete formwork member spanned between the upper end portions of the vertical wall portion, In the rigid structure of the corner portion constituted by the side end of the top plate portion formed by placing the concrete on the formwork member, the vertical wall portion is at the upper end. Hook bars are provided, and the formwork member is integrally provided with an upper rebar that resists a bending moment generated at a corner portion, one end of the upper rebar is embedded in the formwork member, and the reinforcement is placed in the hook rebar. The upper reinforcing bar is engaged with the length reinforcing bar.

また、請求項2に係る発明は、請求項1において、前記型枠部材は、幅方向に連続したトラス鉄筋を一体に設けたことを特徴とする。   The invention according to claim 2 is characterized in that, in claim 1, the formwork member is integrally provided with truss reinforcing bars continuous in the width direction.

また、請求項3に係る発明は、請求項2において、前記トラス鉄筋は、前記型枠部材の幅方向長さより長く形成されていることを特徴とする。   The invention according to claim 3 is characterized in that, in claim 2, the truss reinforcing bar is formed longer than the length in the width direction of the formwork member.

また、請求項4に係る発明は、請求項1又は2において、前記型枠部材には、幅方向に延びるPC鋼材を設けたことを特徴とする。   The invention according to claim 4 is characterized in that, in claim 1 or 2, the mold member is provided with a PC steel material extending in the width direction.

また、請求項5に係る発明は、幅方向両側に設けられた縦壁部の上端と、該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、前記縦壁部は、上端にフック筋を備え、前記フック筋内に配筋される長さ鉄筋に係合した上部鉄筋と、前記型枠部材の側端に設けた補強鉄筋とを備えることを特徴とする。   According to a fifth aspect of the present invention, there is provided an upper end of the vertical wall portion provided on both sides in the width direction, a precast concrete formwork member spanned between the upper end portions of the vertical wall portion, and the upper part of the formwork member. In the rigid structure of the corner portion formed by the side end of the top plate portion formed by placing concrete portion into the concrete portion, the vertical wall portion has a hook line at the upper end, An upper reinforcing bar engaged with a length reinforcing bar arranged in the hook reinforcing bar and a reinforcing reinforcing bar provided at a side end of the formwork member are provided.

また、請求項6に係る発明は、請求項5において、前記補強鉄筋は、抜け止部を備えることを特徴とする。   The invention according to claim 6 is characterized in that, in claim 5, the reinforcing reinforcing bar includes a retaining portion.

また、請求項7に係る発明は、幅方向両側に設けられた縦壁部の上端と、該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、前記縦壁部は、上端にフック筋を備え、前記フック筋内に配筋される長さ鉄筋に係合した上部鉄筋と、前記型枠部材に突出設けたトラス鉄筋とを備え、前記トラス鉄筋は、前記型枠部材の幅方向長さより長く形成されている
ことを特徴とする。
According to a seventh aspect of the present invention, there is provided an upper end of the vertical wall portion provided on both sides in the width direction, a precast concrete formwork member spanned between the upper end portions of the vertical wall portion, and the upper part of the formwork member. In the rigid structure of the corner portion formed by the side end of the top plate portion formed by placing concrete portion into the concrete portion, the vertical wall portion has a hook line at the upper end, An upper reinforcing bar that engages with a length reinforcing bar that is arranged in the hook reinforcing bar, and a truss reinforcing bar that protrudes from the form member, and the truss reinforcing bar is formed to be longer than the length in the width direction of the form member. It is characterized by.

本発明の請求項1記載の隅角部の剛結構造によれば、フック筋内に配筋される長さ鉄筋に前記上部鉄筋を係合することにより、頂版部下側鉄筋、側壁部の内側鉄筋及び斜鉄筋を十分に定着することができるので、定着偏荷重が作用した場合でも、安定して荷重に抵抗することができる。   According to the rigid connection structure of the corner portion according to claim 1 of the present invention, by engaging the upper reinforcing bar with the length reinforcing bar arranged in the hook reinforcing bar, the top plate part lower reinforcing bar, the side wall part Since the inner reinforcing bar and the oblique reinforcing bar can be sufficiently fixed, even when the fixing uneven load is applied, the load can be stably resisted.

また、請求項2に記載の隅角部の剛結構造によれば、型枠部材と打設コンクリート部との一体化を図ることにより、せん断変形を確実に防止することができる。   Moreover, according to the rigid connection structure of the corner part of Claim 2, a shear deformation | transformation can be reliably prevented by aiming at integration of a formwork member and a placement concrete part.

また、請求項3に記載の隅角部の剛結構造によれば、より確実に隅角部の剛結を図ることができる。   Further, according to the rigid connection structure of the corner portion according to the third aspect, the corner portion can be more reliably rigidly connected.

また、請求項4に記載の隅角部の剛結構造によれば、幅方向に延びるPC鋼材を設けたことにより曲げモーメントによる変形を防止できると共に、施工性を向上することができる。   Moreover, according to the rigid connection structure of the corner part of Claim 4, the deformation | transformation by a bending moment can be prevented by providing PC steel material extended in the width direction, and workability | operativity can be improved.

また、請求項5に記載の隅角部の剛結構造によれば、必ずしも上部鉄筋を型枠部材に一体的に設けなくても、安定して荷重に抵抗することができる。   Moreover, according to the rigid connection structure of the corner part of Claim 5, even if it does not necessarily provide an upper rebar integrally with a formwork member, it can resist a load stably.

また、請求項6に記載の隅角部の剛結構造によれば、曲げモーメントが生じた場合であっても、確実に剛結状態を保持することができる。   Moreover, according to the rigid structure of the corner part of Claim 6, even if it is a case where a bending moment arises, a rigid connection state can be hold | maintained reliably.

また、請求項7に記載の隅角部の剛結構造によれば、隅角部を確実に剛結することができるので、補強鉄筋を省略することができる。   Moreover, according to the rigid connection structure of the corner | angular part of Claim 7, since a corner | angular part can be rigidly connected reliably, a reinforcing bar can be abbreviate | omitted.

(1)第1の実施形態
以下図面を参照して、本発明の好適な第1の実施形態について説明する。図1に示すコンクリート組立構造体1(以下、構造体1)は、幅方向に設けられた左右一対のプレキャストコンクリート製の側壁部材2と、前記側壁部材2の上部に設けられた頂版部3とからなり、側壁部材2と頂版部3とは、側壁部材2の上端と頂版部3の側端との結合部分に形成される隅角部1Aにおいて結合される。前記頂版部3は、前記側壁部材2の上部に掛け渡されたプレキャストコンクリート製の型枠部材4と、この型枠部材4の上部にコンクリートを打設して形成した打設コンクリート部5とからなる。
(1) First Embodiment A preferred first embodiment of the present invention will be described below with reference to the drawings. A concrete assembly structure 1 (hereinafter, “structure 1”) shown in FIG. 1 includes a pair of left and right precast concrete side wall members 2 provided in the width direction, and a top plate portion 3 provided on the side wall member 2. The side wall member 2 and the top plate portion 3 are joined at a corner portion 1A formed at a joint portion between the upper end of the side wall member 2 and the side end of the top plate portion 3. The top plate portion 3 includes a precast concrete formwork member 4 that is stretched over the side wall member 2, and a cast concrete portion 5 that is formed by placing concrete on the formwork member 4. Consists of.

側壁部材2は、縦壁部11と、該縦壁部11の下部に一体的に設けられた横方向の自立脚部12とを備える。前記縦壁部11の上面13には、前記型枠部材4の幅方向端部の載置部4Wが載置され、前記縦壁部11には前記載置部4Wに対応して、内面側に突出した張出し受部14を設けている。   The side wall member 2 includes a vertical wall portion 11 and a lateral self-standing leg portion 12 provided integrally with a lower portion of the vertical wall portion 11. On the upper surface 13 of the vertical wall portion 11, a placement portion 4W at the end in the width direction of the mold member 4 is placed, and the vertical wall portion 11 has an inner surface side corresponding to the placement portion 4W described above. The overhang receiving portion 14 is provided in a protruding manner.

型枠部材4は、ほぼ一定厚さの平板状で、構造体1の幅方向に長く、構造体1の長さ方向に短い平面略長方形の形状をなし、構造体1幅方向の両端側下面には下段部15を備え、この下段部15が前記上面13に係合載置される。   The mold member 4 is a flat plate having a substantially constant thickness, has a shape of a substantially rectangular plane that is long in the width direction of the structure 1 and short in the length direction of the structure 1. Is provided with a lower step portion 15, and the lower step portion 15 is engaged and placed on the upper surface 13.

尚、幅方向両側の自立脚部12間に設けられた底版部16は、現場打ちコンクリートなどにより形成される。   The bottom slab portion 16 provided between the free-standing leg portions 12 on both sides in the width direction is formed of spot cast concrete or the like.

また、図2に示すように、型枠部材4には、長さ方向の埋設鉄筋21が幅方向に複数並んで設けられ、これら埋設鉄筋21に縦方向の連結鉄筋22が長さ方向にほぼ等間隔に並んで配置され、それら連結鉄筋22の上部は型枠部材4の上面から上方に突設し、前記連結鉄筋22の上部には長さ方向の上部鉄筋23が結合されている。   In addition, as shown in FIG. 2, a plurality of embedded reinforcing bars 21 in the length direction are provided in the mold member 4 in a line in the width direction, and longitudinal connecting bars 22 are provided in the longitudinal direction on these embedded reinforcing bars 21. Arranged at equal intervals, the upper portions of the connecting reinforcing bars 22 project upward from the upper surface of the mold member 4, and the upper reinforcing bars 23 in the longitudinal direction are coupled to the upper portions of the connecting reinforcing bars 22.

縦壁部11には、斜め方向の鉄筋である斜鉄筋24が設けられている。この斜鉄筋24は、水平方向に対する角度が約45度である斜部25と、該斜部25に連続して形成された鉛直方向に延びる鉛直部26とからなり、縦壁部11の上面13から鉛直部26が突出するように前記斜部25が縦壁部11に埋設されている。鉛直部26の上端には、定着具27が一体的に設けられている。定着具27は、鉄筋の断面積より大きな面積を有する定着板と、鉄筋に螺着するナットとを備えることにより、抜けを防止し、縦壁部11、型枠部材4及び頂版部の密着性を向上することができる。   The vertical wall portion 11 is provided with oblique reinforcing bars 24 that are reinforcing bars in an oblique direction. The oblique reinforcing bar 24 includes an inclined portion 25 having an angle of about 45 degrees with respect to the horizontal direction, and a vertical portion 26 that is formed continuously with the inclined portion 25 and extends in the vertical direction. The inclined portion 25 is embedded in the vertical wall portion 11 so that the vertical portion 26 protrudes from the vertical wall portion 11. A fixing tool 27 is integrally provided at the upper end of the vertical portion 26. The fixing tool 27 is provided with a fixing plate having an area larger than the cross-sectional area of the reinforcing bar and a nut screwed to the reinforcing bar, thereby preventing the vertical wall portion 11, the formwork member 4, and the top plate portion from contacting each other. Can be improved.

縦壁部11には、縦方向の鉄筋が複数埋設されており、幅方向内側には、縦鉄筋28の上部が縦壁部11の上面13から突出しており、縦鉄筋28の上端には定着具27が一体的に設けられている。また、縦壁部11の幅方向外側には縦方向の鉄筋であるフック筋29が設けられている。このフック筋29は、上部を略U字状に折り返して前記上面13より上方に突設し、両端を前記側壁部材2に埋設してなる。   A plurality of vertical reinforcing bars are embedded in the vertical wall portion 11, and the upper part of the vertical reinforcing bar 28 protrudes from the upper surface 13 of the vertical wall portion 11 on the inner side in the width direction, and is fixed to the upper end of the vertical reinforcing bar 28. A tool 27 is provided integrally. Further, a hook bar 29 which is a vertical reinforcing bar is provided on the outer side in the width direction of the vertical wall portion 11. The hook bars 29 are formed such that the upper part is folded back in a substantially U shape and protrudes above the upper surface 13, and both ends are embedded in the side wall member 2.

上部鉄筋23の端部23Cは、縦鉄筋28の上部位置まで延設され、さらに、上部位置から湾曲状の下向きの大湾曲部23Aが前記フック筋29の外側まで形成され、この大湾曲部23A端部に前記フック筋29の上部の曲率とほぼ等しい小湾曲部23Bを形成し、この小湾曲部23Bから前記縦鉄筋28の位置まで上部鉄筋23の端部23Cが延設され、この端部23Cは、前記型枠部材4に埋設されている。このようにして上部鉄筋23は、フック筋29の上部位置で折り返され、端部23Cが型枠部材4に埋設されることにより、型枠部材4に一体的に設けられる。尚、前記大湾曲部23Aと小湾曲部23Bと端部23Cとは、前記上部鉄筋23を構成する鉄筋の端部側を折り曲げ加工して形成されたものである。そして、前記大湾曲部23Aは、ほぼ四分の一円弧(円の四分の一)であり、また、前記小湾曲部23Bもほぼ四分の一円弧である。このように隅角部1Aの剛結構造は、縦壁部11に設けられたフック筋29と、型枠部材4に一体的に設けられた上部鉄筋23とを、長さ鉄筋30を介して結合することにより、図1に示す曲げモーメントM1に対し確実に抵抗し得る。   The end 23C of the upper rebar 23 extends to the upper position of the vertical rebar 28, and further, a curved downward large bending portion 23A is formed from the upper position to the outside of the hook rebar 29, and this large bending portion 23A A small curved portion 23B substantially equal to the curvature of the upper portion of the hook reinforcing bar 29 is formed at the end, and an end 23C of the upper reinforcing bar 23 extends from the small curved portion 23B to the position of the vertical reinforcing bar 28. 23C is embedded in the mold member 4. Thus, the upper rebar 23 is folded back at the upper position of the hook rebar 29, and the end 23C is embedded in the mold member 4, so that the upper rebar 23 is provided integrally with the mold member 4. The large bending portion 23A, the small bending portion 23B, and the end portion 23C are formed by bending the end portions of the reinforcing bars constituting the upper rebar 23. The large curved portion 23A is approximately a quarter arc (a quarter of a circle), and the small curved portion 23B is also approximately a quarter arc. As described above, the rigid connection structure of the corner portion 1A includes the hook rebar 29 provided on the vertical wall portion 11 and the upper rebar 23 provided integrally with the mold member 4 via the length rebar 30. By coupling, it is possible to reliably resist the bending moment M1 shown in FIG.

また、長さ鉄筋30は、上面13の上方においてフック筋29内に配筋されている。フック筋29の上側と内側に配置された長さ鉄筋30はフック筋29に連結され、外側に配置された長さ鉄筋30Aは、フック筋29と小湾曲部23B側とに連結され、下側に配置された長さ鉄筋30Bは端部23C側に連結される。尚、この連結は針金などの結束具による結束や、溶着などを用いることもできる。   Further, the length reinforcing bars 30 are arranged in the hook bars 29 above the upper surface 13. The length reinforcing bar 30 arranged on the upper side and the inner side of the hook bar 29 is connected to the hook bar 29, and the length reinforcing bar 30A arranged on the outer side is connected to the hook bar 29 and the small curved portion 23B side, and the lower side. The length reinforcing bars 30B arranged in the are connected to the end 23C side. Note that this connection can be performed by binding with a binding tool such as a wire or welding.

また、型枠部材4には、該型枠部材4の幅方向に連続した骨組み構造体であるトラス鉄筋45を一体に設けている。このトラス鉄筋45は、弦材に鉄筋を用い、上弦材46の下部両側に下弦材47を配置し、それら弦材46,47は、三角形の頂点の位置にあって、両側の連結斜材48により一体に連結される。この連結斜材48は、長さ方向の上,下頂点が交互に形成された三角波型に屈曲形成されたものであり、上頂点を上弦材46に抵抗点溶接で溶着し、下頂点を下弦材47に抵抗点溶接で溶着してなる。そして、前記両下弦材47を前記型枠部材4に埋設すると共に上部を型枠部材4の上部に露出し、前記トラス鉄筋45が型枠部材4に一体に設けられている。さらに、型枠部材4には、前記斜鉄筋24の鉛直部26が挿通する挿通穴17が穿設されている。   In addition, the mold member 4 is integrally provided with a truss reinforcing bar 45 that is a framework structure continuous in the width direction of the mold member 4. The truss reinforcing bar 45 uses a reinforcing bar as a string member, and lower chord members 47 are arranged on both lower sides of the upper chord member 46. The chord members 46 and 47 are located at the apexes of the triangles and are connected diagonal members 48 on both sides. Are connected together. This connecting diagonal member 48 is bent and formed into a triangular wave shape in which the upper and lower vertices are alternately formed in the length direction, the upper vertex is welded to the upper chord material 46 by resistance spot welding, and the lower vertex is the lower chord. It is welded to the material 47 by resistance spot welding. The lower chord material 47 is embedded in the mold member 4 and the upper part is exposed at the upper part of the mold member 4, and the truss reinforcing bar 45 is provided integrally with the mold member 4. Further, the mold member 4 is provided with an insertion hole 17 through which the vertical portion 26 of the oblique reinforcing bar 24 is inserted.

また、型枠部材4には、図3に示すように、該型枠部材4の長さ方向に延びるPC鋼材51が設けられている。型枠部材4には、PC鋼材51を挿通する挿通穴(図示しない)が予め穿設されており、該挿通穴に挿入したPC鋼材51を緊張・定着した後にPC鋼材51と挿通穴との間にグラウトが充填される。これにより、型枠部材4は、図1に示す曲げモーメントM2に対し確実に抵抗して、変形を防止することができる。   Further, as shown in FIG. 3, the formwork member 4 is provided with a PC steel material 51 extending in the length direction of the formwork member 4. An insertion hole (not shown) for inserting the PC steel material 51 is drilled in the mold member 4 in advance, and after the PC steel material 51 inserted into the insertion hole is tensioned and fixed, the PC steel material 51 and the insertion hole The grout is filled in between. Thus, the mold member 4 can reliably resist the bending moment M2 shown in FIG. 1 and prevent deformation.

このPC鋼材51は、図4に示すように、型枠部材4の幅方向に複数本、本図では2本が平行に並べられている。PC鋼材51は、支圧板52を設けた一端が型枠部材4に埋設され、型枠部材4に設けた段部53に他端を表出させ、支圧板52と共にナット54を螺着することにより緊張するように構成されている。本実施形態では、2本のPC鋼材51のうちの一方は、平面視において、左端が型枠部材4に埋設され、右端が型枠部材4に設けた段部53から表出するように構成されている。また、2本のPC鋼材51のうちの他方は、平面視において、右端が型枠部材4に埋設され、左端が型枠部材4の左側端に設けた段部53から表出するように構成されている。   As shown in FIG. 4, a plurality of PC steel materials 51 are arranged in parallel in the width direction of the mold member 4, and two in this drawing. One end of the PC steel material 51 provided with the support plate 52 is embedded in the mold member 4, the other end is exposed to the stepped portion 53 provided in the mold member 4, and the nut 54 is screwed together with the support plate 52. It is configured to be more nervous. In the present embodiment, one of the two PC steel members 51 is configured so that the left end is embedded in the mold member 4 and the right end is exposed from a stepped portion 53 provided in the mold member 4 in plan view. Has been. Further, the other of the two PC steel members 51 is configured so that the right end is embedded in the mold member 4 and the left end is exposed from a stepped portion 53 provided at the left end of the mold member 4 in plan view. Has been.

段部53は、図5に示すように、型枠部材4の表面側からPC鋼材51の他端にナット54を螺合し得るように形成されている。   As shown in FIG. 5, the stepped portion 53 is formed so that a nut 54 can be screwed onto the other end of the PC steel material 51 from the surface side of the mold member 4.

次に、前記構造体1の施工方法について説明する。まず、構造体1の幅に対応して左右に側壁部材2を並べ、さらに、その側壁部材2を構造体1の長さ方向に連続して並べる。その側壁部材2は自立脚部12を有するため、現場を平坦に均したり、捨てコンクリートなどにより仕上げた箇所に設定すれば、それ自身で安定して自立したものとなる。   Next, the construction method of the structure 1 will be described. First, the side wall members 2 are arranged on the left and right according to the width of the structure 1, and further, the side wall members 2 are continuously arranged in the length direction of the structure 1. Since the side wall member 2 has a self-supporting leg portion 12, if the site is leveled flat or set to a place finished with abandoned concrete or the like, the side wall member 2 becomes stable and independent by itself.

次に、両側の側壁部材2の上部間に型枠部材4を掛け渡し、この型枠部材4を構造体1の長さ方向に隙間なく並べる。この場合、斜鉄筋24は、縦壁部11から突出している部分が鉛直方向に延びる鉛直部26となるように斜部25を縦壁部11に埋設して設けたことにより、型枠部材4を垂直に降下させるだけで側壁部材2に容易に載置することができる。そして、トラス鉄筋45を設けた型枠部材4は比較的軽量であり、吊上げ据付け作業が容易で、しかも、構造体1が幅広であっても安定した構造のものとなり、該型枠部材4を足場及びコンクリート打設時の型枠に用いることができる。尚、側壁部材2間のスパンが大きな場合は、打設コンクリート部5が硬化するまで、型枠部材4の途中を支保工などの架設支持体(図示せず)により支持するようにしてもよい。   Next, the mold member 4 is spanned between the upper portions of the side wall members 2 on both sides, and the mold members 4 are arranged without gaps in the length direction of the structure 1. In this case, the oblique reinforcing bar 24 is provided by embedding the inclined portion 25 in the vertical wall portion 11 so that the portion protruding from the vertical wall portion 11 becomes the vertical portion 26 extending in the vertical direction. Can be easily placed on the side wall member 2 by simply lowering. The formwork member 4 provided with the truss rebars 45 is relatively light and can be easily lifted and installed, and has a stable structure even when the structure 1 is wide. It can be used for scaffolding and formwork when placing concrete. In addition, when the span between the side wall members 2 is large, you may make it support the middle of the formwork member 4 by construction support bodies (not shown), such as a support work, until the placement concrete part 5 hardens | cures. .

その型枠部材4を足場として、打設コンクリート部5の配筋作業を行い、上述したように、上部鉄筋23の小湾曲部23B、フック筋29及び長さ鉄筋30の連結を行う。さらに、長さ方向に複数並べた型枠部材4において、上部鉄筋23を現場で配筋する長さ方向の鉄筋55により連結する。また、長さ鉄筋30も長さ方向に並べた複数の型枠部材4に渡って設けられており、隣合う型枠部材4同士を一体化する。また、打設コンクリート部5のコンクリートを打設する前に、側壁部材2の外周には打設コンクリート部5の型枠材を設けておき、打設コンクリート部5のコンクリートが硬化したら、側壁部材2から取り外す。   Using the formwork member 4 as a scaffold, the placing concrete portion 5 is laid, and the small bending portion 23B, the hook reinforcement 29, and the length reinforcement 30 of the upper reinforcement 23 are connected as described above. Further, in the mold members 4 arranged in the length direction, the upper rebar 23 is connected by a rebar 55 in the length direction that is arranged on site. Moreover, the length reinforcement 30 is also provided over the some formwork member 4 arranged in the length direction, and the adjacent formwork members 4 are integrated. Further, before placing the concrete of the cast concrete part 5, the formwork material of the cast concrete part 5 is provided on the outer periphery of the side wall member 2, and when the concrete of the cast concrete part 5 is hardened, the side wall member Remove from 2.

このように型枠部材4を用いて安定的に配筋作業を完了した後、型枠部材4上及び上面13上に現場打ちコンクリートを打設し、打設コンクリート部5を形成する。この打設コンクリート部5にトラス鉄筋45が埋設固定され、該打設コンクリート部5と型枠部材4とが一体化された頂版部3が得られる。さらに、型枠部材4に一体に設けた上部鉄筋23の端部23Cを、フック筋29を介して長さ鉄筋30と連結した隅角部1Aを打設コンクリート部5内に埋設することにより、構造体1の隅角部1Aにおける剛結が図られる。また、必要に応じて、底版部16を現場打ちコンクリートにより形成し、この構造体1を盛り土や埋設してボックスカルバートとすることができる。   After completing the bar placement work stably using the mold member 4 in this way, the cast-in-place concrete is cast on the mold member 4 and the upper surface 13 to form the cast concrete portion 5. A truss reinforcing bar 45 is embedded and fixed in the cast concrete portion 5 to obtain a top plate portion 3 in which the cast concrete portion 5 and the formwork member 4 are integrated. Further, by embedding the corner portion 1A in which the end portion 23C of the upper rebar 23 provided integrally with the formwork member 4 is connected to the length rebar 30 through the hook rebar 29 in the placing concrete portion 5, Rigid connection at the corner 1A of the structure 1 is achieved. Further, if necessary, the bottom plate portion 16 is formed of cast-in-place concrete, and the structure 1 can be filled or buried to form a box culvert.

上記したように本発明は、幅方向両側に設けられた縦壁部11の上端と、該縦壁部11の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材4の側端とを剛結する隅角部1Aの剛結構造において、前記縦壁部11は、上端にフック筋29を備え、前記型枠部材4は、隅角部1Aに生じる曲げモーメントM1に抵抗する上部鉄筋23を一体的に設け、前記上部鉄筋23の端部23cを前記型枠部材4に埋設し、前記フック筋29内に配筋される長さ鉄筋30に前記上部鉄筋23を係合することとした。これにより、頂版部3の下側鉄筋としての上部鉄筋23の端部23C、縦壁部11の縦鉄筋28及び斜鉄筋24を十分に定着することができるので、定着偏荷重が作用した場合でも、安定して荷重に抵抗することができる。   As described above, the present invention rigidly connects the upper end of the vertical wall portion 11 provided on both sides in the width direction and the side end of the precast concrete formwork member 4 spanned between the upper end portions of the vertical wall portion 11. In the rigid connection structure of the corner portion 1A to be connected, the vertical wall portion 11 is provided with a hook bar 29 at the upper end, and the mold member 4 has an upper reinforcing bar 23 that resists a bending moment M1 generated at the corner portion 1A. Provided integrally, the end portion 23c of the upper rebar 23 is embedded in the mold member 4, and the upper rebar 23 is engaged with a length rebar 30 arranged in the hook rebar 29. As a result, the end portion 23C of the upper rebar 23 as the lower rebar of the top plate portion 3 and the vertical rebar 28 and the oblique rebar 24 of the vertical wall portion 11 can be sufficiently fixed. However, it can stably resist the load.

また、前記型枠部材4は、幅方向に連続したトラス鉄筋45を一体に設け、前記トラス鉄筋45は、型枠部材4と打設コンクリート部5との一体化を図ることにより、型枠部材4と打設コンクリート部5との間のせん断変形を確実に防止することができる。   The formwork member 4 is integrally provided with a truss rebar 45 that is continuous in the width direction, and the truss rebar 45 is formed by integrating the formwork member 4 and the placing concrete portion 5. Shear deformation between 4 and the cast concrete part 5 can be reliably prevented.

また、前記型枠部材4には、幅方向に延びるPC鋼材51を設けたから、曲げモーメントM2による変形を防止できると共に、施工性を向上することができる。   Further, since the PC member 51 extending in the width direction is provided on the formwork member 4, deformation due to the bending moment M2 can be prevented and workability can be improved.

また、トラス鉄筋45は、図6に示すように、型枠部材4の構造体1の幅方向長さより長く、両端において端部45Aが型枠部材4から張出すように形成することとしてもよい。すなわち、前記トラス鉄筋45は、両端が型枠部材4から張出した状態で型枠部材4に一体に設けられている。このように、本実施形態に係る剛結構造では、トラス鉄筋45を前記型枠部材4の幅方向長さより長く形成することとしたから、より強固に型枠部材4と打設コンクリート部5との一体化を図ることができる。
(2)第2の実施形態
次に本発明の第2の実施形態について説明する。本実施形態に係る剛結構造は、図7に示すように、上部鉄筋23が型枠部材4と分離して設けられており、型枠部材4の側端に補強鉄筋61を設けた点において、上記第1の実施形態と異なる。補強鉄筋61は、L字形に形成され、型枠部材4の長さ方向に延びるように配置され、水平方向に延びる一端が型枠部材4に埋設されると共に、垂直方向に延びる他端が型枠部材4の側端から突出し、抜け止部61Aを構成している。このようにして、補強鉄筋61は、他端を垂直方向に曲げ形成して抜け止部61Aを構成することにより、有効定着長さを確保することとした。
Further, as shown in FIG. 6, the truss reinforcing bar 45 may be formed so as to be longer than the width direction length of the structure 1 of the mold member 4 and the end portions 45 </ b> A project from the mold member 4 at both ends. . That is, the truss reinforcing bar 45 is integrally provided on the mold member 4 with both ends projecting from the mold member 4. As described above, in the rigid structure according to the present embodiment, the truss reinforcing bar 45 is formed longer than the length in the width direction of the mold member 4, so that the mold member 4 and the placing concrete portion 5 are more firmly formed. Can be integrated.
(2) Second Embodiment Next, a second embodiment of the present invention will be described. As shown in FIG. 7, the rigid structure according to the present embodiment is such that the upper rebar 23 is provided separately from the formwork member 4, and the reinforcing rebar 61 is provided at the side end of the formwork member 4. This is different from the first embodiment. The reinforcing reinforcing bar 61 is formed in an L shape and is arranged so as to extend in the length direction of the mold member 4. One end extending in the horizontal direction is embedded in the mold member 4, and the other end extending in the vertical direction is the mold. It protrudes from the side end of the frame member 4 and constitutes a retaining portion 61A. In this way, the reinforcing reinforcing bar 61 is secured to the effective fixing length by bending the other end in the vertical direction to form the retaining portion 61A.

また、型枠部材4に設けられるPC鋼材51は、図8に示すように、型枠部材51の幅方向に複数、本図では4本が平行に並べられている。PC鋼材51は、支圧板65を設けた一端が型枠部材4に埋設され、型枠部材4の側端に設けた段部66に他端を表出させ、支圧板65と共にナット67を螺着することにより緊張するように構成されている。本実施形態では、4本のPC鋼材51のうち外側の2本は、平面視において、左端が型枠部材4に埋設され、右端が型枠部材4の右側端に設けた段部66から表出するように構成されている。また、4本のPC鋼材51のうち内側の2本は、平面視において、右端が型枠部材4に埋設され、左端が型枠部材4の左側端に設けた段部66から表出するように構成されている。   Further, as shown in FIG. 8, a plurality of PC steel materials 51 provided on the mold member 4 are arranged in parallel in the width direction of the mold member 51, and four in this figure. One end of the PC steel material 51 provided with the support plate 65 is embedded in the mold member 4, and the other end is exposed to the step portion 66 provided at the side end of the mold member 4, and the nut 67 is screwed together with the support plate 65. It is configured to be tense when worn. In the present embodiment, two of the four PC steel members 51 on the outer side are shown from a step 66 provided with the left end embedded in the mold member 4 and the right end provided on the right end of the mold member 4 in plan view. It is configured to issue. In addition, two of the four PC steel members 51 are exposed from a step portion 66 provided with a right end embedded in the mold member 4 and a left end provided on the left end of the mold member 4 in plan view. It is configured.

このように本実施形態に係る剛結構造では、補強鉄筋61を設けたことにより、上部鉄筋23を型枠部材4に必ずしも一体化的に設けなくても、強固に剛結することができる。しかも、補強鉄筋61には、抜け止部61Aを設けたことにより、曲げモーメントが生じた場合であっても、確実に剛結状態を保持することができる。さらに、補強鉄筋61は、他端を垂直方向に曲げ形成して抜け止部61Aを構成することにより、有効定着長さを確保することとしたので、確実に抜けを防止することができる。   As described above, in the rigid connection structure according to the present embodiment, by providing the reinforcing reinforcing bars 61, the upper reinforcing bars 23 can be firmly rigidly connected without necessarily being provided integrally with the mold member 4. Moreover, since the reinforcing reinforcing bar 61 is provided with the retaining portion 61A, even if a bending moment is generated, the rigid reinforcing state can be reliably maintained. Further, since the reinforcing reinforcing bar 61 is formed by bending the other end in the vertical direction to form the retaining portion 61A, the effective fixing length is secured, so that it is possible to reliably prevent the reinforcing steel bar 61 from coming off.

また、別の実施形態として、図9に示すように、補強鉄筋61に替えてトラス鉄筋45を型枠部材4の幅方向長さより長く形成することとしてもよい。こうすることにより、型枠部材4から突出したトラス鉄筋45により、隅角部1Aを確実に剛結することができるので、補強鉄筋61を省略することができる。   As another embodiment, as shown in FIG. 9, instead of the reinforcing reinforcing bars 61, the truss reinforcing bars 45 may be formed longer than the length in the width direction of the mold member 4. By doing so, the corner portion 1A can be securely bonded by the truss reinforcing bar 45 protruding from the formwork member 4, so that the reinforcing reinforcing bar 61 can be omitted.

本発明は、本実施形態に限定されるものではなく、本発明の要旨の範囲内で種々の変形実施が可能である。例えば、本実施形態では、ボックスカルバートの隅角部について説明したが、本発明はこれに限られず、橋梁や建築物の梁などの隅角部にも適用することができる。   The present invention is not limited to this embodiment, and various modifications can be made within the scope of the gist of the present invention. For example, in the present embodiment, the corner portion of the box culvert has been described. However, the present invention is not limited to this, and the present invention can also be applied to corner portions such as bridges and building beams.

また、本実施形態では、側壁部材がプレキャストコンクリート製であるものについて説明したが、本発明はこれに限らず、縦壁部材を現場打ちコンクリートにより形成することとしてもよい。   In the present embodiment, the side wall member is made of precast concrete. However, the present invention is not limited to this, and the vertical wall member may be formed of cast-in-place concrete.

また、本実施形態では、PC鋼材51が予め緊張・定着した後にPC鋼材51と挿通穴との間にグラウトを充填するポストテンション方式により緊張する場合について説明したが、本発明はこれに限らず、図10に示すように、プレテンション方式により緊張することとしてもよい。   Further, in the present embodiment, the case where the PC steel material 51 is tensioned by a post-tension method in which grout is filled between the PC steel material 51 and the insertion hole after the PC steel material 51 has been tensioned and fixed in advance has been described, but the present invention is not limited thereto. As shown in FIG. 10, it is good also as tensioning by a pretension system.

本発明の第1の実施形態に係る隅角部の剛結構造を備えた構造体の全体構成を示す縦断面図である。It is a longitudinal cross-sectional view which shows the whole structure of the structure provided with the rigid connection structure of the corner | angular part which concerns on the 1st Embodiment of this invention. 同上、隅角部の剛結構造を示す断面図である。It is sectional drawing which shows the rigid connection structure of a corner part same as the above. 同上、型枠部材内の鉄筋の配置を示す縦断面図である。It is a longitudinal cross-sectional view which shows arrangement | positioning of the reinforcing bar in a formwork member same as the above. 同上、型枠部材の平面図である。It is a top view of a formwork member same as the above. 同上、型枠部材の縦断面図である。It is a longitudinal cross-sectional view of a formwork member same as the above. 同上、変形例を示す断面図である。It is sectional drawing which shows a modification as same as the above. 本発明の第2の実施形態に係る隅角部の剛結構造を示す断面図である。It is sectional drawing which shows the rigid connection structure of the corner | angular part which concerns on the 2nd Embodiment of this invention. 同上、型枠部材の平面図である。It is a top view of a formwork member same as the above. 同上、変形例を示す断面図である。It is sectional drawing which shows a modification as same as the above. 同上、型枠部材の変形例を示す平面図である。It is a top view which shows the modification of a formwork member same as the above.

符号の説明Explanation of symbols

1A 隅角部
3 頂版部
4 型枠部材
5 打設コンクリート部
11 縦壁部
13 上面(上端)
23 上部鉄筋
23c 端部(一端)
29 フック筋
30,30A,30B 長さ鉄筋
45 トラス鉄筋
51 PC鋼材
61 補強鉄筋
61A 抜け止部
M1 曲げモーメント
1A corner 3 top plate 4 formwork 5 cast concrete
11 Vertical wall
13 Top (top)
23 Upper rebar
23c End (one end)
29 Hook muscle
30,30A, 30B rebar
45 truss rebar
51 PC steel
61 Reinforcing bar
61A Retaining part
M1 bending moment

Claims (7)

幅方向両側に設けられた縦壁部の上端と、
該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、
前記縦壁部は、上端にフック筋を備え、
前記型枠部材は、隅角部に生じる曲げモーメントに抵抗する上部鉄筋を一体的に設け、
前記上部鉄筋の一端を前記型枠部材に埋設し、
前記フック筋内に配筋される長さ鉄筋に前記上部鉄筋を係合する
ことを特徴とする隅角部の剛結構造。
The upper end of the vertical wall provided on both sides in the width direction;
A side end of a top plate portion comprising a precast concrete formwork member spanned between the upper end portions of the vertical wall portion and a placement concrete portion formed by placing concrete on the formwork member. In the rigid structure of the corner part that is configured,
The vertical wall portion includes a hook line at the upper end,
The formwork member is integrally provided with an upper reinforcing bar that resists a bending moment generated in a corner portion,
One end of the upper rebar is embedded in the formwork member,
A rigid structure of a corner portion, wherein the upper reinforcing bar is engaged with a length reinforcing bar arranged in the hook reinforcing bar.
前記型枠部材は、幅方向に連続したトラス鉄筋を一体に設けたことを特徴とする請求項1記載の隅角部の剛結構造。   The rigid structure of a corner portion according to claim 1, wherein the mold member is integrally provided with truss reinforcing bars that are continuous in the width direction. 前記トラス鉄筋は、前記型枠部材の幅方向長さより長く形成されていることを特徴とする請求項2記載の隅角部の剛結構造。   The rigid structure of a corner portion according to claim 2, wherein the truss reinforcing bar is formed longer than the length in the width direction of the mold member. 前記型枠部材には、幅方向に延びるPC鋼材を設けたことを特徴とする請求項1又は2記載の隅角部の剛結構造。   The rigid structure of a corner portion according to claim 1 or 2, wherein a PC steel material extending in the width direction is provided on the mold member. 幅方向両側に設けられた縦壁部の上端と、
該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、
前記縦壁部は、上端にフック筋を備え、
前記フック筋内に配筋される長さ鉄筋に係合した上部鉄筋と、
前記型枠部材の側端に設けた補強鉄筋と
を備えることを特徴とする隅角部の剛結構造。
The upper end of the vertical wall provided on both sides in the width direction;
A side end of a top plate portion comprising a precast concrete formwork member spanned between the upper end portions of the vertical wall portion and a placement concrete portion formed by placing concrete on the formwork member. In the rigid structure of the corner part that is configured,
The vertical wall portion includes a hook line at the upper end,
An upper rebar engaged with a length rebar arranged in the hook rebar,
A corner rigid connection structure comprising a reinforcing steel bar provided at a side end of the mold member.
前記補強鉄筋は、抜け止部を備えることを特徴とする請求項5記載の隅角部の剛結構造。   The rigid reinforcing structure for a corner portion according to claim 5, wherein the reinforcing reinforcing bar includes a retaining portion. 幅方向両側に設けられた縦壁部の上端と、
該縦壁部の上端部間に掛け渡されるプレキャストコンクリート製の型枠部材と、前記型枠部材上にコンクリートを打設して形成した打設コンクリート部とからなる頂版部の側端とで構成される隅角部の剛結構造において、
前記縦壁部は、上端にフック筋を備え、
前記フック筋内に配筋される長さ鉄筋に係合した上部鉄筋と、
前記型枠部材に突出設けたトラス鉄筋とを備え、
前記トラス鉄筋は、前記型枠部材の幅方向長さより長く形成されている
ことを特徴とする隅角部の剛結構造。
The upper end of the vertical wall provided on both sides in the width direction;
A side end of a top plate portion comprising a precast concrete formwork member spanned between the upper end portions of the vertical wall portion and a placement concrete portion formed by placing concrete on the formwork member. In the rigid structure of the corner part that is configured,
The vertical wall portion includes a hook line at the upper end,
An upper rebar engaged with a length rebar arranged in the hook rebar,
A truss rebar provided protruding from the formwork member,
The corner truss rigid connection structure characterized in that the truss reinforcing bars are formed longer than the length in the width direction of the formwork member.
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JP2016061058A (en) * 2014-09-17 2016-04-25 鹿島建設株式会社 Bar arrangement structure for reinforced concrete structure, and installation method thereof
JP2016069923A (en) * 2014-09-30 2016-05-09 高周波熱錬株式会社 Reinforced concrete structure
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