JP4865650B2 - Reinforcing methods and structures for concrete structures. - Google Patents

Reinforcing methods and structures for concrete structures. Download PDF

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JP4865650B2
JP4865650B2 JP2007194470A JP2007194470A JP4865650B2 JP 4865650 B2 JP4865650 B2 JP 4865650B2 JP 2007194470 A JP2007194470 A JP 2007194470A JP 2007194470 A JP2007194470 A JP 2007194470A JP 4865650 B2 JP4865650 B2 JP 4865650B2
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support
concrete
shear reinforcement
reinforcing
arch plate
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JP2007285119A (en
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大滝健
前田欣昌
岡野晃久
村上達也
井出進一
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Railway Technical Research Institute
Tokyu Construction Co Ltd
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Tokyu Construction Co Ltd
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Description

本発明は、支柱で支持した梁のようなコンクリート構造物の補強方法、および補強構造に関するものである。
The present invention relates to a method for reinforcing a concrete structure such as a beam supported by a column, and a reinforcing structure.

鉄道の高架のような、支柱で梁を支持したコンクリート構造物が劣化した場合の補強方法として、コンクリートを巻きたてて厚さを増加する方法、あるいは鋼板を巻きたてて強度を増加させる方法が開発されている。

As a reinforcement method when a concrete structure supporting a beam with a pillar such as a railway overpass deteriorates, a method of increasing the thickness by winding concrete or a method of increasing the strength by winding a steel plate Has been developed.

前記したような従来のコンクリート構造物の補強方法にあっては、次のような問題点がある。
<イ> コンクリートを巻いて厚さを増加する方法では、コンクリートを打設するための底型枠を梁の下に配置しなければならない。そのためには梁下面に型枠支保工を設置しなければならない。本明細書では下から荷重を支保する仮設材を支保工と呼ぶことにする。この底型枠を支保工を使わずに施工しようとすれば多数のアンカーを梁の下面に、上向きの姿勢で打ちこむ作業が必要となる。
<ロ> 特に流動性の高いコンクリートを打設する場合には強固な支保工が必要となる。また支保工なしに施工する場合には多数のアンカーを梁の下面に、上向きの姿勢で打ち込む作業が必要となる。
<ハ> また、梁側面に配置するせん断補強筋は、梁の下面でL字状に折り曲げ、その折り曲げ端を梁の下面で溶接するという、手間のかかる作業が必要となる。
<ニ> コンクリートの梁の周囲を鋼板で巻きたてる方法は、建設費、維持管理費が高価である。
<ホ> 鋼板を梁に取りつけるには、梁に設置するボルト穴と、鋼板に開口するボルト穴の位置を正確に一致させなければならず、高い精度が要求される。
<ヘ> 分割した鋼板をボルトで取りつけ、その後に溶接して一体化する必要があり、溶接後の塗装、およびそのメンテナンスが必要となる。
<ト> アンカーによって定着した側面の鋼板にせん断補強筋効果を期待する構成である。したがってそのような要求に十分耐え得るだけの多数のアンカーが必要となる。
The conventional method for reinforcing a concrete structure as described above has the following problems.
<I> In the method of increasing the thickness by winding concrete, the bottom formwork for placing concrete must be placed under the beam. For this purpose, a formwork supporter must be installed on the underside of the beam. In this specification, a temporary material that supports a load from below is referred to as a support work. If it is going to construct this bottom formwork without using a supporting work, it will be necessary to drive many anchors on the lower surface of the beam in an upward posture.
<B> In particular, when placing concrete with high fluidity, a strong support is required. Moreover, when constructing without supporting work, it is necessary to drive a large number of anchors into the lower surface of the beam in an upward posture.
<C> Further, the shear reinforcement bars arranged on the side surfaces of the beam require a laborious work of bending the L-shape on the lower surface of the beam and welding the bent end on the lower surface of the beam.
<D> The method of winding the periphery of a concrete beam with a steel plate is expensive in construction cost and maintenance cost.
<E> In order to attach the steel plate to the beam, the position of the bolt hole installed in the beam and the position of the bolt hole opened in the steel plate must be exactly matched, and high accuracy is required.
<F> It is necessary to attach the divided steel plates with bolts and then weld and integrate them, and painting after the welding and maintenance thereof are required.
<G> A configuration in which a shear reinforcement effect is expected on the side steel plate fixed by the anchor. Therefore, a large number of anchors that can sufficiently withstand such demands are required.

上記のような従来の課題を解決した本発明は、両側を支柱などの支持体で支持されているコンクリート構造物である梁の下面と側面の補強方法であって、補強すべき位置の両側の支持体に支持棚を取りつけ、両側の支持棚の間に、アーチ状のアーチ板を配置し、このアーチ板にせん断補強筋の一端を取りつけ、このせん断補強筋の他端は、補強対象のコンクリートに、側面から取りつけ、前記のアーチ板と、せん断補強筋の外側に配置した側面型枠との内部にコンクリートを打設して行うコンクリート構造物の補強方法を特徴とするものである。 The present invention that has solved the conventional problems as described above is a method for reinforcing the lower and side surfaces of a beam, which is a concrete structure that is supported on both sides by a support such as a column, on both sides of the position to be reinforced. A support shelf is attached to the support, an arched arch plate is placed between the support shelves on both sides, and one end of the shear reinforcement bar is attached to this arch plate, and the other end of the shear reinforcement bar is the concrete to be reinforced. Further, the present invention is characterized in that the concrete structure is reinforced by placing concrete inside the arch plate and the side mold disposed outside the shear reinforcement bars.

また本発明は、両側を支柱などの支持体で支持されているコンクリート構造物である梁の下面と側面の補強方法であって、支持体の外側に鉛直方向に主筋を配置し、この主筋を避ける状態で、支持体に支持棚を取りつけ、両側の支持棚の間に、アーチ状のアーチ板を配置し、このアーチ板にせん断補強筋の一端を取りつけ、このせん断補強筋の他端は、補強対象のコンクリートに、側面から取りつけ、前記のアーチ板と、せん断補強筋の外側に配置した側面型枠との内部、および支持体の主筋の外側に配置した支持体用型枠の内部にコンクリートを打設して行うコンクリート構造物の補強方法を特徴とするものである。
Further, the present invention is a method for reinforcing the lower and side surfaces of a beam, which is a concrete structure supported on both sides by a support such as a support, and a main bar is arranged in a vertical direction outside the support, and the main bar is In a state to avoid, attach a support shelf to the support, place an arched arch plate between the support shelves on both sides, attach one end of the shear reinforcement to this arch plate, the other end of this shear reinforcement is Concrete attached to the concrete to be reinforced from the side, inside the arch plate and the side mold placed outside the shear reinforcement, and inside the support mold placed outside the main bar of the support It is characterized by a method of reinforcing a concrete structure performed by placing the

本発明のコンクリート構造物の補強方法は以上説明したようになるから次のような効果を得ることができる。
<1> 補強すべき位置の両側の支持体に支持棚を取りつけ、この支持棚の間にアーチ状にアーチ板を配置する構成であるから、梁の下に支保工を組み立てる作業、あるいは梁の下面に底型枠を支持するための多数のアンカーを打ち込む作業が不要であり、経済的である。
<2> せん断補強筋がアーチ板をも支持する構成であるから、確実にアーチ板を支持することができる。
<3> せん断補強筋の一端をアーチ板の一部にボルトで取りつける構成を採用すれば溶接作業が不要となり施工性が向上する。
Since the concrete structure reinforcing method of the present invention is as described above, the following effects can be obtained.
<1> Since the support shelf is attached to the support bodies on both sides of the position to be reinforced, and the arch plate is arranged between the support shelves, the work of assembling the support work under the beam, or the beam The operation of driving a large number of anchors for supporting the bottom mold on the lower surface is unnecessary and economical.
<2> Since the shear reinforcement bars are configured to support the arch plate, the arch plate can be reliably supported.
<3> If the structure which attaches the end of a shear reinforcement to a part of arch board with a volt | bolt is employ | adopted, welding will become unnecessary and workability will improve.

以下図面を参照しながら本発明のコンクリート構造物の補強方法の実施例を説明する。   Embodiments of the reinforcing method for concrete structures of the present invention will be described below with reference to the drawings.

<1>全体の構成。
本発明のコンクリート構造物の補強方法は、両側を支柱1などの支持体で支持されているコンクリート構造物の下面の補強方法である。
補強する対象はコンクリート梁2に限らず、コンクリートのスラブの下面などを対象とすることができる。
両側の支持体は支柱1に限らず、壁面などを対象とすることができる。
<1> Overall configuration.
The method for reinforcing a concrete structure according to the present invention is a method for reinforcing the lower surface of a concrete structure that is supported on both sides by a support such as a column 1.
The object to be reinforced is not limited to the concrete beam 2 but can be the lower surface of a concrete slab.
The support bodies on both sides are not limited to the support column 1 and can be a wall surface or the like.

<2>支柱棚3の取り付け。
例えば梁2を支持しているその両側の支柱1の表面に支柱棚3を取りつける。
この支柱棚3は例えば断面がL字状のアングル材を使用することができる。
この支柱棚3を、支柱1などの支持体の表面にアンカーで固定する。
<2> Attaching the column shelf 3.
For example, the column shelf 3 is attached to the surface of the column 1 on both sides supporting the beam 2.
For example, an angle member having an L-shaped cross section can be used for the column shelf 3.
The column shelf 3 is fixed to the surface of a support such as the column 1 with an anchor.

<3>アーチ板4の配置。
両側の支柱棚3の間に、アーチ状に曲げて形成したアーチ板4を配置する。
このアーチ板4は例えば亜鉛メッキを施した鋼板を、曲面状に曲げて使用する。
この鋼板で構成したアーチ板4の上面には、長手方向に沿って両縁にH鋼などの型鋼41を取りつけて補強する。
当然、この型鋼41もアーチ板と同一の曲率で曲面状に曲げて構成してある。
アーチ板4の両縁に取りつけた補強用の型鋼41には、外側から多数の個所に切り欠き41aを形成する。
この切り欠き41aは、外側が開放しているから、後述するせん断補強筋5を外側から挿入することができる。
アーチ板4の両端は、支柱棚3の上に搭載し、その端部を溶接して固定する。
この溶接は端部だけでよいから作業は簡単である上に、溶接によってアーチ板4の亜鉛メッキが受ける損傷も限られた一部だけであるから、該当する箇所の補修塗装を行えばよい。
<3> Arrangement of the arch plate 4.
Between the support racks 3 on both sides, an arch plate 4 formed in an arch shape is disposed.
As this arch plate 4, for example, a galvanized steel plate is bent into a curved surface.
On the upper surface of the arch plate 4 made of this steel plate, a steel plate 41 such as H steel is attached to both edges along the longitudinal direction for reinforcement.
Of course, this steel plate 41 is also bent and formed into a curved surface with the same curvature as the arch plate.
The reinforcing steel plate 41 attached to both edges of the arch plate 4 is formed with notches 41a at a number of locations from the outside.
Since the cutout 41a is open on the outside, a shear reinforcing bar 5 described later can be inserted from the outside.
Both ends of the arch plate 4 are mounted on the column shelf 3, and the ends thereof are fixed by welding.
This welding is simple because only the end portion is required, and only a part of the damage that the galvanizing of the arch plate 4 is damaged by the welding may be performed, so that the corresponding portion may be repaired.

<4>せん断補強筋5の取りつけ。
せん断補強筋5は、補強する部分に配置する鉄筋である。
このせん断補強筋5は、取付けに際して水平に挿入する水平部51と、鉛直に配置する鉛直部52によってL字状に形成する。
せん断補強筋5を梁2に取りつけるには、梁2に水平方向からアンカー孔を削孔し、そのアンカー孔にせん断補強筋5の上側の水平部分を側面方向から挿入して接着剤で固定する。
一方、せん断補強筋5の鉛直部52の下端にはねじ山を形成しておく。
そして、せん断補強筋5の下端を、アーチ板4の補強用の型鋼41の切り欠き41aに外側から挿入する。
上記したように、この切り欠き41aは、外側が開放しているから、せん断補強筋5を外側から挿入することができる。
そしてせん断補強筋5のネジ山にナット53を締付けることによって、型鋼41のフランジを上下両側から締付ければ、せん断補強筋5と型鋼41とを一体化することができる。
このようにボルトとナット53の組み合わせでアーチ板4を梁2に取りつければ、熟練工による溶接作業を必要とせず、迅速な作業を行うことができる。
このような構成のせん断補強筋5を多数本配置すれば、多数の個所において、せん断補強筋5によってアーチ板4を補強対象の梁2から吊り下げることができる。
なお、せん断補強筋5は、L字型に直交した形状に限るものではなく、図5に示すように、アンカー孔21を上向きでかつ、鉛直でない角度で削孔しそれにあわせた形状でせん断補強筋5を形成して使用することも可能である。
その場合にはせん断補強筋5は、鉛直部52と、非水平部54とによって構成することになる。
<4> Mounting of the shear reinforcement 5
The shear reinforcing bar 5 is a reinforcing bar arranged at a portion to be reinforced.
The shear reinforcing bar 5 is formed in an L shape by a horizontal part 51 that is inserted horizontally during mounting and a vertical part 52 that is vertically arranged.
In order to attach the shear reinforcement 5 to the beam 2, an anchor hole is drilled in the beam 2 from the horizontal direction, and the upper horizontal portion of the shear reinforcement 5 is inserted into the anchor hole from the side surface and fixed with an adhesive. .
On the other hand, a thread is formed at the lower end of the vertical portion 52 of the shear reinforcement 5.
Then, the lower end of the shear reinforcement 5 is inserted into the notch 41a of the reinforcing steel plate 41 of the arch plate 4 from the outside.
As described above, since the cutout 41a is open on the outside, the shear reinforcing bar 5 can be inserted from the outside.
Then, by tightening the nut 53 to the thread of the shear reinforcement bar 5, the shear reinforcement bar 5 and the mold steel 41 can be integrated by tightening the flange of the steel mold 41 from both the upper and lower sides.
Thus, if the arch board 4 is attached to the beam 2 by the combination of the bolt and the nut 53, a welding operation by a skilled worker is not required, and a quick operation can be performed.
If a large number of shear reinforcement bars 5 having such a configuration are arranged, the arch plate 4 can be suspended from the beam 2 to be reinforced by the shear reinforcement bars 5 at a large number of locations.
The shear reinforcing bar 5 is not limited to a shape orthogonal to the L-shape, and as shown in FIG. 5, the anchor hole 21 is drilled upward and at a non-vertical angle, and shear reinforcement is performed in accordance with the shape. It is also possible to use the muscle 5 by forming it.
In that case, the shear reinforcement 5 is constituted by the vertical portion 52 and the non-horizontal portion 54.

<5>コンクリートの打設。
上記のような構成によって梁2に取りつけたアーチ板4の両側に、側面型枠6を取り付ける。
この側面型枠6は、せん断補強筋5の外側に配置することになる。
そしてアーチ板4と、せん断補強筋5の外側に配置した側面型枠6との内部にコンクリートを打設する。
コンクリートとして流動性の高いコンクリートを使用した場合には大きい側圧が発生するが、上記したようにアーチ板4はその両端は支柱棚3に支持され、中間は多数本のせん断補強筋5によっても支持されているため、底型枠を確実に支保して安全にコンクリートの打設を行うことができる。
こうして梁2の下部と側部の厚さを増すことによってコンクリート構造物を補強することができるが、アーチ板4は埋設型枠であり、支保工であるだけでなく曲げ補強材としても機能するから、強度の向上に貢献する。
せん断補強筋5は、アーチ板4を支持する支持部材として機能すると同時にせん断補強材として機能して、コンクリート部材の強度の向上に貢献する。
<5> Placing concrete.
The side form frames 6 are attached to both sides of the arch plate 4 attached to the beam 2 with the above-described configuration.
The side surface formwork 6 is arranged outside the shear reinforcing bar 5.
Then, concrete is placed inside the arch plate 4 and the side mold 6 disposed outside the shear reinforcement 5.
When concrete with high fluidity is used as concrete, a large lateral pressure is generated. As described above, both ends of the arch plate 4 are supported by the column shelf 3, and the middle is also supported by a large number of shear reinforcement bars 5. Therefore, concrete can be placed safely by securely supporting the bottom formwork.
Although the concrete structure can be reinforced by increasing the thickness of the lower and side portions of the beam 2 in this way, the arch plate 4 is an embedded formwork and functions not only as a support work but also as a bending reinforcement. Contributes to strength improvement.
The shear reinforcement 5 functions as a support member that supports the arch plate 4 and at the same time functions as a shear reinforcement, contributing to an improvement in the strength of the concrete member.

<6>支持体も補強する実施例。(図4)
以上の実施例は、梁2のように、両側を支柱1などの支持体で支持されているコンクリート構造物の下面の補強方法であった。
この実施例はさらに両側の支柱1なども同時に補強する場合について説明する。
まず支柱1のような支持体の表面が劣化していれば、その劣化層を削り取ってしまう。
削りとった面の外側に支柱1に支柱棚3を取りつける。
その後、支持棚3の外側に、鉛直方向に主筋11を配置する。
そのためには支柱棚3は櫛の歯のような状態で切りこみを入れておき、この切りこみの位置が主筋11の一致するように構成すればよい。
こうして取りつけた両側の支柱棚3の間に、アーチ板4を配置し、せん断補強筋5の配置など、上記の実施例と同様の作業を行う。
その後に、アーチ板4と、せん断補強筋5の外側に配置した側面型枠との内部、および支柱1の主筋11の外側に配置した支柱用型枠の内部にコンクリートを打設する。
こうして梁2のようなコンクリート構造物の下面だけの補強だけでなく、構造物を支持する支柱1や壁面のような支持体も同時に補強することができる。
<6> Example in which the support is also reinforced. (Fig. 4)
The embodiment described above is a method for reinforcing the lower surface of a concrete structure such as the beam 2 that is supported on both sides by a support such as the support column 1.
In this embodiment, a case in which the struts 1 on both sides are reinforced at the same time will be described.
First, if the surface of the support like the support column 1 is deteriorated, the deteriorated layer is scraped off.
A column shelf 3 is attached to the column 1 on the outside of the cut surface.
Thereafter, the main bars 11 are arranged in the vertical direction outside the support shelf 3.
For this purpose, the column shelf 3 is cut in a state like a comb tooth, and the position of the cut may be configured to coincide with the main muscle 11.
The arch plate 4 is disposed between the column shelves 3 on both sides thus mounted, and the same operations as in the above-described embodiment are performed, such as the disposition of the shear reinforcement bars 5.
After that, concrete is placed in the interior of the arch plate 4 and the side mold disposed outside the shear reinforcement bar 5 and the interior of the column mold disposed outside the main bar 11 of the column 1.
Thus, not only the reinforcement of the lower surface of the concrete structure such as the beam 2 but also the support such as the support column 1 and the wall surface for supporting the structure can be reinforced at the same time.

本発明のコンクリート構造物の補強方法の実施例の説明図。Explanatory drawing of the Example of the reinforcement method of the concrete structure of this invention. 支柱にアーチ板や型鋼を取り付ける状態の側面からの説明図。Explanatory drawing from the side of the state which attaches an arch board and a shape steel to a support | pillar. 支柱にアーチ板や型鋼を取付ける状態の断面からの説明図。Explanatory drawing from the cross section of the state which attaches an arch board and a shape steel to a support | pillar. 支柱の表面も補強する場合の説明図。Explanatory drawing in the case of also reinforcing the surface of a support | pillar. せん断補強筋の他の形状の説明図。Explanatory drawing of the other shape of a shear reinforcement.

符号の説明Explanation of symbols

1:支柱
2:梁
3:支持棚
4:アーチ板
41:型鋼
41a:切り欠き
5:せん断補強筋
1: Prop
2: Beam
3: Support shelf
4: Arch board
41: Shape steel
41a: Notch
5: Shear reinforcement

Claims (5)

両側を支柱などの支持体で支持されているコンクリート構造物である梁の下面と側面の補強方法であって、
補強すべき位置の両側の支持体に支持棚を取りつけ、
両側の支持棚の間に、アーチ状のアーチ板を配置し、
このアーチ板にせん断補強筋の一端を取りつけ、
このせん断補強筋の他端は、補強対象のコンクリートに、側面から取りつけ、
前記のアーチ板と、せん断補強筋の外側に配置した側面型枠との内部にコンクリートを打設して行う、
コンクリート構造物の補強方法。
A method of reinforcing the lower and side surfaces of a beam, which is a concrete structure supported on both sides by a support such as a support,
Attach a support shelf to the support on both sides of the position to be reinforced,
Place an arched arch plate between the support shelves on both sides,
Attach one end of the shear reinforcement to this arch plate,
The other end of this shear reinforcement is attached to the concrete to be reinforced from the side ,
Performing by placing concrete inside the arch plate and the side mold placed outside the shear reinforcement,
A method of reinforcing concrete structures.
両側を支柱などの支持体で支持されているコンクリート構造物である梁の下面と側面の補強方法であって、
支持体の外側に鉛直方向に主筋を配置し、
この主筋を避ける状態で、支持体に支持棚を取りつけ、
両側の支持棚の間に、アーチ状のアーチ板を配置し、
このアーチ板にせん断補強筋の一端を取りつけ、
このせん断補強筋の他端は、補強対象のコンクリートに、側面から取りつけ、
前記のアーチ板と、せん断補強筋の外側に配置した側面型枠との内部、
および支持体の主筋の外側に配置した支持体用型枠の内部にコンクリートを打設して行う、
コンクリート構造物の補強方法。
A method of reinforcing the lower and side surfaces of a beam, which is a concrete structure supported on both sides by a support such as a support,
Place the main bars in the vertical direction outside the support,
In a state avoiding this main bar, attach a support shelf to the support,
Place an arched arch plate between the support shelves on both sides,
Attach one end of the shear reinforcement to this arch plate,
The other end of this shear reinforcement is attached to the concrete to be reinforced from the side ,
The inside of the arch plate and a side mold placed outside the shear reinforcement,
And by placing concrete inside the support formwork placed outside the main bars of the support,
A method of reinforcing concrete structures.
アーチ板の上面には補強用の型鋼を取りつけて構成した、
請求項1または請求項2記載の、コンクリート構造物の補強方法。
The upper surface of the arch plate is constructed by attaching a reinforcing steel plate.
The method for reinforcing a concrete structure according to claim 1 or 2.
せん断補強筋の一端は、
アーチ板の上面に取りつけた補強用の型鋼の切り欠きに挿入し、せん断補強筋のネジ部とナットによって型鋼に固定した、
請求項1または請求項2記載の、コンクリート構造物の補強方法。
One end of the shear reinforcement is
It was inserted into the notch of the reinforcing steel plate attached to the upper surface of the arch plate, and fixed to the steel plate with the screw part and nut of the shear reinforcement bar.
The method for reinforcing a concrete structure according to claim 1 or 2.
両側を支柱などの支持体で支持されているコンクリート構造物である梁の下面と側面の補強構造であって、
補強すべき位置の両側の支持体に取りつけた支持棚と、
両側の支持棚の間に、アーチ状に配置したアーチ板と、
このアーチ板に一端を取りつけ、他端を補強対象のコンクリートに側面から取りつけたせん断補強筋と、
せん断補強筋を包囲する状態で、アーチ板の上部に打設したコンクリートによって構成した、
コンクリート構造物の補強構造。
Reinforcement structure of the lower and side surfaces of the beam, which is a concrete structure supported on both sides by a support such as a support,
A support shelf attached to the support on both sides of the position to be reinforced,
Between the support shelves on both sides, an arch plate arranged in an arch shape,
One end is attached to this arch plate, the other end is attached to the concrete to be reinforced from the side , and
Constructed by concrete placed on top of the arch plate in a state surrounding the shear reinforcement.
Reinforcement structure for concrete structures.
JP2007194470A 2007-07-26 2007-07-26 Reinforcing methods and structures for concrete structures. Active JP4865650B2 (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846753A (en) * 2015-05-28 2015-08-19 大连市市政设计研究院有限责任公司 Bridge deck opening maintaining method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52109720A (en) * 1976-03-10 1977-09-14 Shiyoobondo Kk Method of reinforcing reinforced concrete floor board

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104846753A (en) * 2015-05-28 2015-08-19 大连市市政设计研究院有限责任公司 Bridge deck opening maintaining method

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