JP5700608B1 - Reinforced joint structure of precast concrete slab - Google Patents

Reinforced joint structure of precast concrete slab Download PDF

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JP5700608B1
JP5700608B1 JP2014128787A JP2014128787A JP5700608B1 JP 5700608 B1 JP5700608 B1 JP 5700608B1 JP 2014128787 A JP2014128787 A JP 2014128787A JP 2014128787 A JP2014128787 A JP 2014128787A JP 5700608 B1 JP5700608 B1 JP 5700608B1
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joint
precast concrete
rebar
reinforcing bar
upper joint
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JP2016008410A (en
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祐介 ▲高▼木
祐介 ▲高▼木
崇 小林
崇 小林
幸夫 廣井
幸夫 廣井
中村 定明
定明 中村
山本 豊
豊 山本
永康 張
永康 張
神吉 祐輔
祐輔 神吉
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株式会社Ihiインフラ建設
ジャパンライフ株式会社
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Abstract

【課題】本発明は、プレキャストコンクリート床版同士の接合部の長さを短く設定して施工でき、幅員分割施工においては施工時の作業幅や車両通行幅を広く確保でき、プレキャストコンクリート床版の橋軸直角方向をPC構造として設計した場合にRC構造の範囲を狭くでき、鉄筋径の増大や床版厚の増加をももたらすことのないプレキャストコンクリート床版の鉄筋継手構造を提供することを目的とする。【解決手段】本願発明は、相隣るプレキャストコンリート床版を接続するプレキャストコンクリート床版の鉄筋継手構造であり、上部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が下向きに張り出して形成され、下部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が上向きに張り出して形成されてなり、継手空間内では上部継手鉄筋及び下部継手鉄筋が突き合わされて配置されてコンクリートが打設されることを特徴とする。【選択図】 図1An object of the present invention is to set the length of a joint portion between precast concrete floor slabs to be short, and in width division construction, it is possible to secure a wide work width and vehicle passage width at the time of construction. The purpose of the present invention is to provide a precast concrete slab reinforcement joint structure that can narrow the range of the RC structure when the bridge axis perpendicular direction is designed as a PC structure, and does not increase the diameter of the reinforcing bar or increase the thickness of the slab. And The present invention is a reinforced joint structure of a precast concrete floor slab that connects adjacent precast concrete floor slabs, and a locking part that projects in a substantially semi-disc shape faces downward from the tip of the upper joint rebar. From the tip of the lower joint reinforcing bar, a locking part that protrudes in a substantially semi-disc shape is formed to protrude upward, and the upper joint reinforcing bar and the lower joint reinforcing bar are abutted in the joint space. It is arranged and concrete is laid. [Selection] Figure 1

Description

本発明は、プレキャストコンクリート床版同士の接合部における鉄筋継手構造に関するものである。
The present invention relates to a reinforced joint structure at a joint between precast concrete slabs.

プレキャストコンクリート床版の鉄筋継手構造としては、主に重ね継手構造やループ鉄筋継手構造が一般的に知られている。   As a reinforced joint structure of a precast concrete floor slab, a lap joint structure and a loop reinforced joint structure are generally known.

ここで、重ね継手構造(図10参照)によって鉄筋を継ぐ場合には、いわゆる道路橋示方書で定められた必要重ね継手長は、一般的に鉄筋径の30倍程度となり、例えば、鉄筋径D19の場合には接合部の長さは650mm程度の長さとなる。   Here, when reinforcing bars are joined by a lap joint structure (see FIG. 10), the required lap joint length defined in the so-called road bridge specifications is generally about 30 times the diameter of the reinforcing bar, for example, the reinforcing bar diameter D19. In this case, the length of the joint is about 650 mm.

そして、この長さは、ループ鉄筋継手構造の接合部の長さよりも長くなってしまい、その接合部に打設される現場打ちコンクリートの量も多いものであった。   And this length became longer than the length of the junction part of a loop rebar joint structure, and the amount of the cast-in-place concrete poured in the junction part was also large.

前記接合部の現場打ちコンクリートは、プレキャストコンクリート床版で打設されるコンクリートよりも高価であり、当該打設量が多いとコストが割高になってしまいきわめて不経済となる。   The cast-in-place concrete at the joint is more expensive than concrete cast with a precast concrete slab, and if the cast amount is large, the cost becomes high and it becomes very uneconomical.

また、現場打ちコンクリートの量が多いことで、現場の作業時間が長くなるとの課題がある。   In addition, there is a problem that the working time at the site becomes longer due to the large amount of the on-site concrete.

さらに、二車線以上の幅員を有する既設床版につきプレキャストコンクリート床版を取り替える作業は、例えば、一般車両の片側通行を確保しながらプレキャストコンクリート床版の取り替え作業を行うものとなり、もって前記プレキャストコンクリート床版を橋軸直角方向に分割する幅員分割施工が採用される。   Further, the work of replacing the precast concrete floor slab with an existing floor slab having a width of two or more lanes is, for example, the work of replacing the precast concrete floor slab while ensuring one-side traffic of a general vehicle, and thus the precast concrete floor slab The width division construction that divides the plate in the direction perpendicular to the bridge axis is adopted.

しかしながら、前記幅員分割施工で、前記接合部の幅が長くなると、幅員の幅によっては施工の作業幅や車両通行幅を広く確保できないとの課題があった(図8、図9参照)。   However, when the width of the joint portion is increased in the width division construction, there is a problem that the work work width and the vehicle passage width cannot be secured widely depending on the width of the width (see FIGS. 8 and 9).

また、プレキャストコンクリート床版の橋軸直角方向をプレストレストコンクリート構造(PC構造)として設計した場合には、接合部が長いことで鉄筋コンクリート構造(RC構造)の範囲が広くなり、耐久性の面でも不利となるとの課題がある。   In addition, when the pre-cast concrete slab is designed in the direction perpendicular to the bridge axis as a prestressed concrete structure (PC structure), the long joint part widens the range of reinforced concrete structure (RC structure), which is disadvantageous in terms of durability. There is a problem to become.

次に、ループ鉄筋継手(図11参照)にて鉄筋を継ぐ場合には、必要重ね継手長を前述した重ね継手構造よりも短くすることで接合部の長さを短くできるが、いわゆる道路橋示方書で定められる鉄筋の曲げ内半径によってループ形状が決定するため、重ね継手構造に比べて床版厚が厚くなるとの課題がある。   Next, when connecting a reinforcing bar with a loop reinforcing bar joint (see FIG. 11), the length of the joint can be shortened by making the required lap joint length shorter than the lap joint structure described above. Since the loop shape is determined by the bending radius of the reinforcing bar defined in the book, there is a problem that the floor slab thickness becomes thicker than that of the lap joint structure.

床版厚が厚くなると、所定の計画高に適用できない場合や、床版重量が増加するために反力や応力が増加し、支承部や既設桁、下部構造が構造的に不利となる課題がある。
If the floor slab thickness is increased, it may not be possible to apply to the predetermined planned height, or the reaction force and stress will increase due to the increase in floor slab weight, which will cause structural disadvantages for the bearings, existing girders and substructure is there.

特開2008−303538号公報JP 2008-303538 A

かくして、本発明は前記従来の課題を解決するために創案されたものであり、プレキャストコンクリート床版同士の接合部の長さを短く設定して施工でき、もって現場打ちコンクリートの打設量を減少すること、及び現場の作業時間を短くすることができ、幅員分割施工においては、施工時の作業幅や車両通行幅を広く確保でき、プレキャストコンクリート床版の橋軸直角方向をプレストレストコンクリート構造(PC構造)として設計した場合に、鉄筋コンクリート構造(RC構造)の範囲を狭くでき、しかも、鉄筋径の増大や床版厚の増加をももたらすことのないプレキャストコンクリート床版の鉄筋継手構造を提供することを目的とするものである。
Thus, the present invention was devised to solve the above-mentioned conventional problems, and can be constructed by setting the length of the joint portion between the precast concrete floor slabs short, thereby reducing the amount of cast-in-place concrete. And the work time at the site can be shortened. In the width division construction, the work width and the vehicle passage width during construction can be secured widely, and the pre-stressed concrete structure (PC To provide a reinforced joint structure for precast concrete slabs that can narrow the range of reinforced concrete structures (RC structures) when designed as a structure, and that does not increase the diameter of the reinforcing bars or the thickness of the slabs It is intended.

本願発明によるプレキャストコンクリート床版の鉄筋継手構造は、
プレキャストコンクリート床版の接合端部から突設された上部継手鉄筋及び下部継手鉄筋を介し、相隣るプレキャストコンクリート床版を接続するプレキャストコンクリート床版の鉄筋継手構造であり、
前記プレキャストコンクリート床版の接合端面厚み方向の同一線上に間隔をおいて一対の上部継手鉄筋及び下部継手鉄筋が突設され、該一対の上部継手鉄筋及び下部継手鉄筋は、前記接合端面の長手方向に向かい間隔をおいて複数設けられ、
前記上部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が下向きに張り出して形成されると共に、該係止部の上面部は上部継手鉄筋の上面と略面一となるよう形成され、下部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が上向きに張り出して形成されると共に、該係止部の下面部は下部継手鉄筋の下面と略面一となるよう、前記上部継手鉄筋及び下部継手鉄筋先端部を加熱して金型に収納し、熱間鍛造して上部継手鉄筋及び下部継手鉄筋と一体形成されてなり、
相隣るプレキャストコンクリート床版からの前記上部継手鉄筋及び下部継手鉄筋を突き合わせるように配置し、相隣る他方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋と、該上部継手鉄筋及び下部継手鉄筋と接合端面の長手方向に向かい隣り合う上部継手鉄筋及び下部継手鉄筋との間に、一方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋が収まるよう、一方側のプレキャストコンクリート床版を下側に移動させて、相隣るプレキャストコンクリート床版が直線状になるよう配置し、
前記上部継手鉄筋及び下部継手鉄筋が突き合わされて配置された継手空間内にコンクリートが打設される、
ことを特徴とし、
または、
プレキャストコンクリート床版の接合端部から突設された上部継手鉄筋及び下部継手鉄筋を介し、相隣るプレキャストコンクリート床版を接続するプレキャストコンクリート床版の鉄筋継手構造であり、
前記プレキャストコンクリート床版の接合端面厚み方向の同一線上に間隔をおいて一対の上部継手鉄筋及び下部継手鉄筋が突設され、該一対の上部継手鉄筋及び下部継手鉄筋は、前記接合端面の長手方向に向かい間隔をおいて複数設けられ、
前記上部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が下向きに張り出して形成されると共に、該係止部の上面部は上部継手鉄筋の上面と略面一となるよう形成され、下部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が上向きに張り出して形成されると共に、該係止部の下面部は下部継手鉄筋の下面と略面一となるよう、前記上部継手鉄筋及び下部継手鉄筋先端部を加熱して金型に収納し、熱間鍛造して上部継手鉄筋及び下部継手鉄筋と一体形成されてなり、
相隣るプレキャストコンクリート床版からの前記上部継手鉄筋及び下部継手鉄筋を突き合わせるように配置し、相隣る他方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋と、該上部継手鉄筋及び下部継手鉄筋と接合端面の長手方向に向かい隣り合う上部継手鉄筋及び下部継手鉄筋との間に、一方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋が収まるよう、一方側のプレキャストコンクリート床版を下側に移動させて、相隣るプレキャストコンクリート床版が直線状になるよう配置し、
前記上部継手鉄筋及び下部継手鉄筋が突き合わされて配置された継手空間内にコンクリートが打設され、
前記継手鉄筋間の引張力を前記継手鉄筋とコンクリートの付着力及び前記係止部の支圧力とで伝達する、
ことを特徴とし、
または、
前記継手鉄筋先端部に形成された係止部は、継手鉄筋先端部を略1000℃に加熱して金型に収納し、熱間鍛造して形成した、
ことを特徴とするものである。
Reinforced joint structure of precast concrete floor slab according to the present invention,
Reinforced joint structure of precast concrete floor slabs connecting adjacent precast concrete slabs via upper joint rebar and lower joint rebars protruding from the joint end of the precast concrete slab,
A pair of upper joint reinforcing bars and lower joint reinforcing bars protrude from the precast concrete floor slab on the same line in the joining end face thickness direction, and the pair of upper joint reinforcing bars and lower joint reinforcing bars are arranged in the longitudinal direction of the joining end face. A plurality are provided at intervals toward the
A locking portion that protrudes in a substantially semi-disc shape is formed to project downward from the tip of the upper joint rebar, and the upper surface of the locking portion is substantially flush with the upper surface of the upper joint rebar. A locking portion that is formed in a substantially semi-disc shape and projects upward from the tip of the lower joint reinforcing bar is formed upward, and the lower surface portion of the locking portion is substantially flush with the lower surface of the lower joint reinforcing bar. The upper joint rebar and the lower joint rebar tip are heated and stored in a mold, and hot forged to be integrally formed with the upper joint rebar and the lower joint rebar,
The upper joint rebar and the lower joint rebar from the adjacent precast concrete floor slabs are abutted against each other, and the upper joint rebar and the lower joint rebar protruding from the adjacent precast concrete floor slab, The upper joint reinforcing bar and the lower joint reinforcing bar projecting from the precast concrete slab on one side can be accommodated between the upper joint reinforcing bar and the lower joint reinforcing bar and the upper joint reinforcing bar and the lower joint reinforcing bar adjacent to each other in the longitudinal direction of the joint end face. Move the precast concrete floor slabs on one side to the lower side, and arrange the adjacent precast concrete slabs in a straight line,
Concrete is placed in a joint space in which the upper joint rebar and the lower joint rebar are butted together.
It is characterized by
Or
Reinforced joint structure of precast concrete floor slabs connecting adjacent precast concrete slabs via upper joint rebar and lower joint rebars protruding from the joint end of the precast concrete slab,
A pair of upper joint reinforcing bars and lower joint reinforcing bars protrude from the precast concrete floor slab on the same line in the joining end face thickness direction, and the pair of upper joint reinforcing bars and lower joint reinforcing bars are arranged in the longitudinal direction of the joining end face. A plurality are provided at intervals toward the
A locking portion that protrudes in a substantially semi-disc shape is formed to project downward from the tip of the upper joint rebar, and the upper surface of the locking portion is substantially flush with the upper surface of the upper joint rebar. A locking portion that is formed in a substantially semi-disc shape and projects upward from the tip of the lower joint reinforcing bar is formed upward, and the lower surface portion of the locking portion is substantially flush with the lower surface of the lower joint reinforcing bar. The upper joint rebar and the lower joint rebar tip are heated and stored in a mold, and hot forged to be integrally formed with the upper joint rebar and the lower joint rebar,
The upper joint rebar and the lower joint rebar from the adjacent precast concrete floor slabs are abutted against each other, and the upper joint rebar and the lower joint rebar protruding from the adjacent precast concrete floor slab, The upper and lower joint reinforcing bars projecting from the precast concrete slab on one side fit between the upper and lower joint reinforcing bars and the upper and lower joint reinforcing bars adjacent to each other in the longitudinal direction of the joint end face. Move the precast concrete floor slabs on one side to the lower side, and arrange the adjacent precast concrete slabs in a straight line,
Concrete is placed in the joint space where the upper joint rebar and the lower joint rebar are butted together,
The tensile force between the joint rebars is transmitted by the adhesion force between the joint rebar and concrete and the support pressure of the locking portion.
It is characterized by
Or
The engaging portion formed at the joint reinforcing bar tip was formed by heating the joint reinforcing bar tip to approximately 1000 ° C. and storing it in a mold, and hot forging.
It is characterized by this.

よって、継手鉄筋の先端部を例えば半楕円形の拡径に加工した継手鉄筋とし、これを使用することによって、従来の重ね継手構造よりも必要重ね継手長を短くして接合部の長さを短くできる。また、ループ鉄筋継手構造のように継手鉄筋の曲げ内半径によって床版厚が厚くなることがない。
Therefore, the tip of the joint rebar is, for example, a joint rebar processed into a semi-elliptical diameter expansion, and by using this, the required lap joint length is shortened compared to the conventional lap joint structure and the length of the joint is reduced. Can be shortened. Further, the floor slab thickness does not increase due to the bending inner radius of the joint rebar unlike the loop rebar joint structure.

本発明によるプレキャストコンクリート床版の鉄筋継手構造であれば、接合部の長さを短くすることができるため、現場打ちコンクリートの打設量を減少することや現場打ちコンクリートの打設量を減少させることで、コストを安価にし、現場の作業時間を短くすることができる。   With the reinforced joint structure of the precast concrete slab according to the present invention, the length of the joint can be shortened, so that the amount of cast-in-place concrete is reduced and the amount of cast-in-place concrete is reduced. As a result, the cost can be reduced and the work time on site can be shortened.

また、幅員分割施工において、接合部の長さを短くすることで、施工時の作業幅や車両通行幅を広く確保できる。そして、プレキャストコンクリート床版の橋軸直角方向をプレストレストコンクリート構造(PC構造)として設計した場合に、鉄筋コンクリート構造(RC構造)の範囲を狭くでき、耐久性を向上させることが出来る。   Moreover, in the width division construction, by shortening the length of the joint portion, it is possible to ensure a wide working width and vehicle passage width during construction. And when the bridge axis perpendicular direction of a precast concrete slab is designed as a prestressed concrete structure (PC structure), the range of a reinforced concrete structure (RC structure) can be narrowed and durability can be improved.

さらに、道路橋示方書で定められるかぶりで決定する鉄筋の有効高が小さく、鉄筋径の増大や床版厚の増加をもたらすことがないとの優れた効果を奏する。
Further, the effective height of the reinforcing bar determined by the cover defined by the road bridge specification is small, and there is an excellent effect that the reinforcing bar diameter is not increased and the floor slab thickness is not increased.

本発明の構成説明図(1)である。It is composition explanatory drawing (1) of this invention. 本発明の構成説明図(2)である。It is composition explanatory drawing (2) of this invention. 本発明の構成説明図(3)である。It is composition explanatory drawing (3) of this invention. 本発明の構成説明図(4)である。It is composition explanatory drawing (4) of this invention. 本発明の構成説明図(5)である。It is a structure explanatory view (5) of the present invention. 本発明の構成説明図(6)である。It is a structure explanatory view (6) of the present invention. 本発明の構成説明図(7)である。It is structure explanatory drawing (7) of this invention. 本発明の使用例を説明する説明図(1)である。It is explanatory drawing (1) explaining the usage example of this invention. 本発明の使用例を説明する説明図(2)である。It is explanatory drawing (2) explaining the usage example of this invention. 従来の構成説明図(1)である。It is conventional structure explanatory drawing (1). 従来の構成説明図(2)である。It is conventional composition explanatory drawing (2).

以下、本発明を図に基づいて説明する。   Hereinafter, the present invention will be described with reference to the drawings.

図1乃至図4に本発明の一実施例を示す。
符号1はプレキャストコンクリート床版を示し、該プレキャストコンクリート床版1の接合端部2からは上部継手鉄筋3及び下部継手鉄筋4がプレキャストコンクリート床版1の前方に向かって突設されている。
1 to 4 show an embodiment of the present invention.
Reference numeral 1 denotes a precast concrete floor slab, and an upper joint rebar 3 and a lower joint rebar 4 protrude from the joint end 2 of the precast concrete floor slab 1 toward the front of the precast concrete floor slab 1.

そして、この上部継手鉄筋3の先端部からは、略半円盤状に張り出す係止部5が下向きに張り出して形成されると共に、該係止部5の上面部6は、前記上部継手鉄筋3の上面と略面一となるよう形成されている(図5(a)、(b)参照)。   And from the front-end | tip part of this upper joint reinforcing bar 3, while the latching | locking part 5 projecting in a substantially semi-disc shape is projected and formed downward, the upper surface part 6 of this latching | locking part 5 is the said upper joint reinforcement 3 It is formed so as to be substantially flush with the upper surface (see FIGS. 5A and 5B).

また、下部継手鉄筋4の先端部からは、略半円盤状に張り出す係止部5が前記上部継手鉄筋3の場合とは異なり、上向きに張り出して形成されている。そして、この係止部4の下面部7は下部継手鉄筋4の下面と略面一となるよう形成されている。   Unlike the case of the upper joint rebar 3, a locking portion 5 that projects in a substantially semi-disc shape is formed to project upward from the tip of the lower joint rebar 4. The lower surface portion 7 of the locking portion 4 is formed so as to be substantially flush with the lower surface of the lower joint reinforcing bar 4.

ここで、前記係止部4の形成方法については、何ら限定されるものではないが、前記継手鉄筋の先端部を略1000℃程度に加熱し、その後、加熱した先端部を金型に収納し、もって熱間鍛造して形成することが考えられる。   Here, the method of forming the locking portion 4 is not limited in any way, but the tip of the joint rebar is heated to about 1000 ° C., and then the heated tip is stored in a mold. Therefore, it is conceivable to form by hot forging.

しかして、プレキャストコンクリート床版1の接合端部2から突設された上部継手鉄筋3及び下部継手鉄筋4を介し、相隣るプレキャストコンクリート床版1、1を接続するものとなる。 Thus, the adjacent precast concrete floor slabs 1 and 1 are connected via the upper joint rebar 3 and the lower joint rebar 4 protruding from the joint end 2 of the precast concrete floor slab 1.

すなわち、図2に示すように、各々のプレキャストコンクリート床版1、1の接合端部2から突設された上部継手鉄筋3及び下部継手鉄筋4を突き合わせるようにして配置し、一方側のプレキャストコンクリート床版1を下側に移動させて、相隣るプレキャストコンクリート床版1、1を直線状に、すなわち図3に示すように設置する。   That is, as shown in FIG. 2, it arrange | positions so that the upper joint reinforcement 3 and the lower joint reinforcement 4 which protruded from the joining edge part 2 of each precast concrete floor slab 1 and 1 may be faced | matched, and the one side precast The concrete floor slab 1 is moved downward, and the adjacent precast concrete floor slabs 1 and 1 are installed in a straight line, that is, as shown in FIG.

符号8は、相隣るプレキャストコンクリート床版1、1を直線状に、すなわち図3に示すように設置した際の接合部であり、この接合部8内にコンクリートが打設されてプレキャストコンクリート床版1、1が接続されるものとなる。   Reference numeral 8 denotes a joint when the adjacent precast concrete floor slabs 1 and 1 are installed in a straight line, that is, as shown in FIG. 3, and the concrete is cast into the joint 8 so that the precast concrete floor The plates 1 and 1 are connected.

ここで、前述したように、上部継手鉄筋3の先端部に形成された係止部5は下向きに張り出すと共に、その上面部は図3,図5から理解されるように、上部継手鉄筋3の上面と略面一となるよう形成されており、また下部継手鉄筋4の先端部に形成された係止部5は、上向きに張り出すと共に、その下面部は図2、図3から理解されるように、下部継手鉄筋4の下面と略面一となるよう形成されている。   Here, as described above, the locking portion 5 formed at the tip of the upper joint rebar 3 projects downward, and the upper surface portion of the upper joint rebar 3 is understood from FIGS. 3 and 5. The engaging portion 5 formed at the tip of the lower joint reinforcing bar 4 protrudes upward, and its lower surface portion is understood from FIGS. 2 and 3. Thus, it is formed so as to be substantially flush with the lower surface of the lower joint rebar 4.

よって、図6に示すように、係止部5の形状が正円状に正楕円状に張り出し、上部継手鉄筋3の上面と略面一に上面部6を形成せず、また下部継手鉄筋4についても、その下面と略面一に下面部7を形成しない場合と、本発明の係止部5の様に、上部継手鉄筋3の上面と略面一に上面部6を形成し、また下部継手鉄筋4についても、その下面と略面一に下面部7を形成した場合では明らかに「かぶり」幅が異なり、本発明の係止部5の場合には図6(b)に示すようにかぶり幅を狭く形成でき、もって継手鉄筋の有効高を大きく取ることが出来るものとなる。   Therefore, as shown in FIG. 6, the shape of the locking portion 5 projects into a perfect ellipse in a perfect circle, does not form the upper surface portion 6 substantially flush with the upper surface of the upper joint rebar 3, and the lower joint rebar 4 In the case where the lower surface portion 7 is not formed substantially flush with the lower surface thereof, the upper surface portion 6 is formed substantially flush with the upper surface of the upper joint rebar 3 as in the case of the locking portion 5 of the present invention, and the lower portion. The joint rebar 4 also has a different “cover” width when the lower surface portion 7 is formed substantially flush with the lower surface thereof. In the case of the locking portion 5 of the present invention, as shown in FIG. The cover width can be narrowed, and the effective height of the joint rebar can be increased.

なお、本発明の継手構造により、前記接合部8における継手鉄筋間の引張力を前記上部継手鉄筋3、下部継手鉄筋4とコンクリートとの付着力及び前記係止部5の支圧力とで伝達するものとしてある。   In addition, with the joint structure of this invention, the tensile force between the joint reinforcements in the said junction part 8 is transmitted with the adhesive force of the said upper joint reinforcement 3, the lower joint reinforcement 4, and concrete, and the support pressure of the said latching | locking part 5. FIG. As a thing.

次に、図7,図8、図9に本発明を二車線以上の幅員を有する既設床版、すなわちプレキャストコンクリート床版1を取り替える作業に適用した具体例を示す。   Next, FIG. 7, FIG. 8, and FIG. 9 show specific examples in which the present invention is applied to an operation for replacing an existing floor slab having a width of two or more lanes, that is, a precast concrete floor slab 1.

本件のような具体例の場合は、例えば、一般車両の片側通行を確保しながらプレキャストコンクリート床版1の取り替え作業を行なわなければならない。従って、プレキャストコンクリート床版1を橋軸直角方向に分割する幅員分割施工が採用される(図7乃至図9参照)。   In the case of a specific example like this case, for example, the replacement work of the precast concrete floor slab 1 must be performed while ensuring one-way traffic of a general vehicle. Therefore, the width division construction which divides the precast concrete floor slab 1 in the direction perpendicular to the bridge axis is adopted (see FIGS. 7 to 9).

しかしながら、前記幅員分割施工で、前記接合部8の幅が長くなると、幅員の幅によっては施工の作業幅や車両通行幅を広く確保できない。また、プレキャストコンクリート床版1の橋軸直角方向をプレストレストコンクリート構造(PC構造)として設計した場合には、接合部が長いことで鉄筋コンクリート構造(RC構造)の範囲が広くなり、耐久性の面でも不利となる。   However, when the width of the joint portion 8 is increased in the width division construction, the construction work width and the vehicle passage width cannot be secured depending on the width of the width. In addition, when the pre-stressed concrete slab 1 is designed as a prestressed concrete structure (PC structure) in the direction perpendicular to the bridge axis, the long joints will widen the range of reinforced concrete structure (RC structure), and also in terms of durability. Disadvantageous.

しかし、本発明を適用すれば、図9(b)に示すように、車両通行幅を広く確保できることが出来るのである。
However, if the present invention is applied, a wide vehicle passage width can be secured as shown in FIG. 9B.

1 プレキャストコンクリート床版
2 接合端部
3 上部継手鉄筋
4 下部継手鉄筋
5 係止部
6 係止部の上面部
7 係止部の下面部
8 接合部
DESCRIPTION OF SYMBOLS 1 Precast concrete floor slab 2 Joint edge part 3 Upper joint reinforcement 4 Lower joint reinforcement 5 Locking part 6 Upper surface part of a locking part 7 Lower surface part 8 of a locking part

Claims (3)

プレキャストコンクリート床版の接合端部から突設された上部継手鉄筋及び下部継手鉄筋を介し、相隣るプレキャストコンクリート床版を接続するプレキャストコンクリート床版の鉄筋継手構造であり、
前記プレキャストコンクリート床版の接合端面厚み方向の同一線上に間隔をおいて一対の上部継手鉄筋及び下部継手鉄筋が突設され、該一対の上部継手鉄筋及び下部継手鉄筋は、前記接合端面の長手方向に向かい間隔をおいて複数設けられ、
前記上部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が下向きに張り出して形成されると共に、該係止部の上面部は上部継手鉄筋の上面と略面一となるよう形成され、下部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が上向きに張り出して形成されると共に、該係止部の下面部は下部継手鉄筋の下面と略面一となるよう、前記上部継手鉄筋及び下部継手鉄筋先端部を加熱して金型に収納し、熱間鍛造して上部継手鉄筋及び下部継手鉄筋と一体形成されてなり、
相隣るプレキャストコンクリート床版からの前記上部継手鉄筋及び下部継手鉄筋を突き合わせるように配置し、相隣る他方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋と、該上部継手鉄筋及び下部継手鉄筋と接合端面の長手方向に向かい隣り合う上部継手鉄筋及び下部継手鉄筋との間に、一方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋が収まるよう、一方側のプレキャストコンクリート床版を下側に移動させて、相隣るプレキャストコンクリート床版が直線状になるよう配置し、
前記上部継手鉄筋及び下部継手鉄筋が突き合わされて配置された継手空間内にコンクリートが打設される、
ことを特徴とするプレキャストコンクリート床版の鉄筋継手構造。
Reinforced joint structure of precast concrete floor slabs connecting adjacent precast concrete slabs via upper joint rebar and lower joint rebars protruding from the joint end of the precast concrete slab,
A pair of upper joint reinforcing bars and lower joint reinforcing bars protrude from the precast concrete floor slab on the same line in the joining end face thickness direction, and the pair of upper joint reinforcing bars and lower joint reinforcing bars are arranged in the longitudinal direction of the joining end face. A plurality are provided at intervals toward the
A locking portion that protrudes in a substantially semi-disc shape is formed to project downward from the tip of the upper joint rebar, and the upper surface of the locking portion is substantially flush with the upper surface of the upper joint rebar. A locking portion that is formed in a substantially semi-disc shape and projects upward from the tip of the lower joint reinforcing bar is formed upward, and the lower surface portion of the locking portion is substantially flush with the lower surface of the lower joint reinforcing bar. The upper joint rebar and the lower joint rebar tip are heated and stored in a mold, and hot forged to be integrally formed with the upper joint rebar and the lower joint rebar,
The upper joint rebar and the lower joint rebar from the adjacent precast concrete floor slabs are abutted against each other, and the upper joint rebar and the lower joint rebar protruding from the adjacent precast concrete floor slab, The upper joint reinforcing bar and the lower joint reinforcing bar projecting from the precast concrete slab on one side can be accommodated between the upper joint reinforcing bar and the lower joint reinforcing bar and the upper joint reinforcing bar and the lower joint reinforcing bar adjacent to each other in the longitudinal direction of the joint end face. Move the precast concrete floor slabs on one side to the lower side, and arrange the adjacent precast concrete slabs in a straight line,
Concrete is placed in a joint space in which the upper joint rebar and the lower joint rebar are butted together.
Reinforced joint structure of precast concrete slab characterized by that.
プレキャストコンクリート床版の接合端部から突設された上部継手鉄筋及び下部継手鉄筋を介し、相隣るプレキャストコンクリート床版を接続するプレキャストコンクリート床版の鉄筋継手構造であり、
前記プレキャストコンクリート床版の接合端面厚み方向の同一線上に間隔をおいて一対の上部継手鉄筋及び下部継手鉄筋が突設され、該一対の上部継手鉄筋及び下部継手鉄筋は、前記接合端面の長手方向に向かい間隔をおいて複数設けられ、
前記上部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が下向きに張り出して形成されると共に、該係止部の上面部は上部継手鉄筋の上面と略面一となるよう形成され、下部継手鉄筋の先端部からは、略半円盤状に張り出す係止部が上向きに張り出して形成されると共に、該係止部の下面部は下部継手鉄筋の下面と略面一となるよう、前記上部継手鉄筋及び下部継手鉄筋先端部を加熱して金型に収納し、熱間鍛造して上部継手鉄筋及び下部継手鉄筋と一体形成されてなり、
相隣るプレキャストコンクリート床版からの前記上部継手鉄筋及び下部継手鉄筋を突き合わせるように配置し、相隣る他方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋と、該上部継手鉄筋及び下部継手鉄筋と接合端面の長手方向に向かい隣り合う上部継手鉄筋及び下部継手鉄筋との間に、一方側のプレキャストコンクリート床版から突設された上部継手鉄筋及び下部継手鉄筋が収まるよう、一方側のプレキャストコンクリート床版を下側に移動させて、相隣るプレキャストコンクリート床版が直線状になるよう配置し、
前記上部継手鉄筋及び下部継手鉄筋が突き合わされて配置された継手空間内にコンクリートが打設され、
前記継手鉄筋間の引張力を前記継手鉄筋とコンクリートの付着力及び前記係止部の支圧力とで伝達する、
ことを特徴とするプレキャストコンクリート床版の鉄筋継手構造。
Reinforced joint structure of precast concrete floor slabs connecting adjacent precast concrete slabs via upper joint rebar and lower joint rebars protruding from the joint end of the precast concrete slab,
A pair of upper joint reinforcing bars and lower joint reinforcing bars protrude from the precast concrete floor slab on the same line in the joining end face thickness direction, and the pair of upper joint reinforcing bars and lower joint reinforcing bars are arranged in the longitudinal direction of the joining end face. A plurality are provided at intervals toward the
A locking portion that protrudes in a substantially semi-disc shape is formed to project downward from the tip of the upper joint rebar, and the upper surface of the locking portion is substantially flush with the upper surface of the upper joint rebar. A locking portion that is formed in a substantially semi-disc shape and projects upward from the tip of the lower joint reinforcing bar is formed upward, and the lower surface portion of the locking portion is substantially flush with the lower surface of the lower joint reinforcing bar. The upper joint rebar and the lower joint rebar tip are heated and stored in a mold, and hot forged to be integrally formed with the upper joint rebar and the lower joint rebar,
The upper joint rebar and the lower joint rebar from the adjacent precast concrete floor slabs are abutted against each other, and the upper joint rebar and the lower joint rebar protruding from the adjacent precast concrete floor slab, The upper joint reinforcing bar and the lower joint reinforcing bar projecting from the precast concrete slab on one side can be accommodated between the upper joint reinforcing bar and the lower joint reinforcing bar and the upper joint reinforcing bar and the lower joint reinforcing bar adjacent to each other in the longitudinal direction of the joint end face. Move the precast concrete floor slabs on one side to the lower side, and arrange the adjacent precast concrete slabs in a straight line,
Concrete is placed in the joint space where the upper joint rebar and the lower joint rebar are butted together,
The tensile force between the joint rebars is transmitted by the adhesion force between the joint rebar and concrete and the support pressure of the locking portion.
Reinforced joint structure of precast concrete slab characterized by that.
前記継手鉄筋先端部に形成された係止部は、継手鉄筋先端部を略1000℃に加熱して金型に収納し、熱間鍛造して形成した、
ことを特徴とする請求項1又は請求項2記載のプレキャストコンクリート床版の鉄筋継手構造。
The engaging portion formed at the joint reinforcing bar tip was formed by heating the joint reinforcing bar tip to approximately 1000 ° C. and storing it in a mold, and hot forging.
The rebar joint structure for precast concrete slabs according to claim 1 or claim 2, wherein:
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CN114589805B (en) * 2022-03-21 2023-04-14 江西省交通工程集团建设有限公司 Prefabricated reinforced concrete rectangular bridge deck prefabricating method

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