JP3668974B1 - Concrete slab and method for constructing concrete slab - Google Patents

Concrete slab and method for constructing concrete slab Download PDF

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JP3668974B1
JP3668974B1 JP2004025624A JP2004025624A JP3668974B1 JP 3668974 B1 JP3668974 B1 JP 3668974B1 JP 2004025624 A JP2004025624 A JP 2004025624A JP 2004025624 A JP2004025624 A JP 2004025624A JP 3668974 B1 JP3668974 B1 JP 3668974B1
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concrete
plate
tension plate
tension
girder
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JP2005213976A (en
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長瀬覚
塚原悌信
清水正巳
松木田正義
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Taisei Corp
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Abstract

【課題】 経済的に構築でき、耐久性に優れたコンクリート床版及びコンクリート床版の構築方法を提供すること。
【解決手段】 現場でコンクリートを打設して構築するコンクリート床版であって、間隔を置いて配置した複数の桁部材2,2と、引張部材であって前記桁部材2,2間に架け渡す引張板1と、前記引張板1の上面に打設するコンクリート3と、からなり、前記引張板1の端部を板の面方向に凹凸となるように成形し、該凹凸部11と前記桁部材2を溶接によって固定したことを特徴とするものである。
【選択図】図1
PROBLEM TO BE SOLVED: To provide a concrete floor slab that can be economically constructed and excellent in durability and a method for constructing a concrete floor slab.
A concrete floor slab constructed by placing concrete on-site, and a plurality of girder members 2 and 2 arranged at intervals, and a tension member that extends between the girder members 2 and 2 It consists of a tension plate 1 to be handed over and concrete 3 to be placed on the upper surface of the tension plate 1, and the end portion of the tension plate 1 is formed to be uneven in the surface direction of the plate, The girder member 2 is fixed by welding.
[Selection] Figure 1

Description

本発明は、現場でコンクリートを打設して構築するコンクリート床版及びその構築方法に関するものである。
The present invention relates to a concrete slab that is constructed by placing concrete on site and a construction method thereof.

現場でコンクリートを打設してコンクリート床版を構築するために、従来から色々な方法が実施されてきた。
最も古くから実施されている方法は、型枠と支保工を使用する方法で、コンクリートの下面を形成する位置に型枠を設置し、型枠の上面に打設するコンクリートの荷重を支持するために型枠の下に支保工を配置する方法である。また、コンクリート製の撤去不要の埋設型枠を使用して床版を構築する方法もある。
さらに、特許文献1に開示されているように、専用のデッキプレートaを主桁b間に架け渡し、その上面にコンクリートを打設してコンクリート床版を構築する方法もある(図4参照)。この方法では、コンクリートの荷重はデッキプレートaの曲げ耐力で支持されるため、デッキプレートaは主桁b上に設置されるだけか、またはずれ止め程度に固定されているに過ぎない。
特開平8−93108号公報
Conventionally, various methods have been implemented to construct concrete floor slabs by placing concrete on site.
The method that has been practiced since the oldest is to use a formwork and a support, in order to support the concrete load placed on the upper surface of the formwork by installing the formwork at the position where the lower surface of the concrete is formed This is a method of placing a support under the formwork. There is also a method of constructing a floor slab using a concrete formwork that does not require removal.
Furthermore, as disclosed in Patent Document 1, there is also a method of constructing a concrete floor slab by placing a dedicated deck plate a between main beams b and placing concrete on the upper surface thereof (see FIG. 4). . In this method, since the concrete load is supported by the bending strength of the deck plate a, the deck plate a is only installed on the main beam b or is fixed to the extent of slippage prevention.
JP-A-8-93108

前記した従来のコンクリート床版及びコンクリート床版の構築方法にあっては、次のような問題点がある。
<1>撤去式の型枠及び支保工を使用する方法では、支保工の設置及び撤去作業を床下の狭い空間で行わなければならず、作業効率が悪い。また、型枠を撤去した後にコンクリート面が露出するため、塩害などに対する長期耐久性が乏しい。
<2>コンクリート製の埋設型枠は、部材が厚く重量が大きいため、取り扱いにくく、大型クレーンを配備しなければならない場合もある。
<3>デッキプレートaの形状は曲げ剛性で設定されているため、主桁b,b間の間隔が広くなったり、構築するコンクリート床版の厚さが厚くなったりすると、デッキプレートaの断面またはデッキプレートaを構成している鋼板の肉厚が大きくなり、材料費が高くなるため不経済である。
The above-described conventional concrete slabs and concrete floor slab construction methods have the following problems.
<1> In the method of using the removable formwork and the support work, the support work must be installed and removed in a narrow space under the floor, and the work efficiency is poor. Moreover, since the concrete surface is exposed after removing the formwork, long-term durability against salt damage is poor.
<2> Since the embedded formwork made of concrete is thick and heavy, it is difficult to handle, and a large crane may need to be deployed.
<3> Since the shape of the deck plate a is set by bending rigidity, the cross section of the deck plate a is increased when the distance between the main girders b and b is increased or the thickness of the concrete slab to be built is increased. Or the thickness of the steel plate which comprises the deck plate a becomes large, and since material cost becomes high, it is uneconomical.

上記のような課題を解決するために、本発明のコンクリート床版は、現場でコンクリートを打設して構築するコンクリート床版であって、間隔をおいて配置した複数の桁部材と、引張部材であって前記桁部材間に架け渡す引張板と、前記引張板の上面に打設するコンクリートと、からなり、前記引張板には前記コンクリートの荷重を作用させることによって面方向の引張り力を発生させ、前記引張り力に対抗できるように、前記引張板の縁端部を凹凸状に形成し、該凹凸部と前記桁部材を溶接によって固定することができる。
また、現場でコンクリートを打設して構築するコンクリート床版の構築方法において、間隔をおいて複数の桁部材を配置し、引張部材である引張板を前記桁部材間に架け渡し、前記引張板には前記コンクリートの荷重を作用させることによって面方向の引張り力を発生させ、前記引張り力に対抗できるように、前記引張板の縁端部を凹凸状に形成した凹凸部を前記桁部材に溶接によって固定し、前記引張板の上面にコンクリートを打設する、コンクリート床版の構築方法である。
In order to solve the above-described problems, the concrete floor slab of the present invention is a concrete floor slab constructed by placing concrete on site, and includes a plurality of girder members arranged at intervals, and a tension member The tension plate spans between the girder members and the concrete placed on the upper surface of the tension plate, and a tensile force in the surface direction is generated by applying a load of the concrete to the tension plate. Then, the edge portion of the tension plate can be formed in a concavo-convex shape so as to counter the tensile force, and the concavo-convex portion and the girder member can be fixed by welding.
Further, in a method for constructing a concrete slab that is constructed by placing concrete on site, a plurality of girder members are arranged at intervals, a tension plate as a tension member is bridged between the girder members, and the tension plate In order to generate a tensile force in the surface direction by applying a load of the concrete and to counter the tensile force, an uneven portion in which an edge portion of the tension plate is formed in an uneven shape is welded to the girder member. It is a construction method of a concrete floor slab in which the concrete is fixed by and concrete is placed on the upper surface of the tension plate.

本発明のコンクリート床版及びコンクリート床版の構築方法は、上記した課題を解決するための手段により、次のような効果の少なくとも一つを得ることができる。
<1>引張り力を付与できる引張板を使用することで、型枠の断面が小さくなり、薄肉の板材を埋設型枠として使用できるので経済的である。
<2>コンクリート床版の下面が引張板で覆われることになるため、塩害などに対する耐久性が向上する。また、引張板の表面を防食加工したり、ステンレス製の引張板を使用したりすることで更に耐久年数を延ばすことができる。
<3>薄肉の引張材を埋設型枠として使用できるため、取り扱い易く、床版全体の重量の削減も可能である。
The concrete floor slab and the method for constructing the concrete floor slab of the present invention can obtain at least one of the following effects by means for solving the above-described problems.
<1> By using a tension plate capable of imparting a tensile force, the cross section of the mold is reduced, and a thin plate material can be used as an embedded mold, which is economical.
<2> Since the lower surface of the concrete slab is covered with a tension plate, durability against salt damage and the like is improved. Further, the durability can be further extended by subjecting the surface of the tension plate to anticorrosion processing or using a stainless steel tension plate.
<3> Since a thin tensile material can be used as an embedded formwork, it is easy to handle and the weight of the entire floor slab can be reduced.

以下、図面を参照しながら本発明の実施の形態について説明する。   Hereinafter, embodiments of the present invention will be described with reference to the drawings.

<1>コンクリート床版
コンクリート床版は、現場でコンクリートを打設して構築する床版である。本発明のコンクリート床版は、複数の桁部材2,2・・・と、桁部材2,2間に架け渡す引張板1と、引張板1の上面に打設するコンクリート3によって構成する。
コンクリート3は、通常、鉄筋31を配置した鉄筋コンクリートとし、引張板1を設置した後に引張板1の上面で鉄筋31を組み立てる。また、コンクリート3と桁部材2の一体化を図る場合には、孔の開いた有孔ジベル板21を桁部材2の上面に固定し、コンクリート3の内部に埋め込まれるようにする方法がある。
<1> Concrete floor slab Concrete floor slab is a floor slab constructed by placing concrete on site. The concrete slab of the present invention is constituted by a plurality of girder members 2, 2..., A tension plate 1 spanned between the girder members 2 and 2, and concrete 3 placed on the upper surface of the tension plate 1.
The concrete 3 is usually reinforced concrete in which the reinforcing bars 31 are arranged, and the reinforcing bars 31 are assembled on the upper surface of the tension plate 1 after the tension plate 1 is installed. Further, when integrating the concrete 3 and the girder member 2, there is a method in which a perforated diver plate 21 having a hole is fixed to the upper surface of the girder member 2 and embedded in the concrete 3.

<2>引張板
引張板1は、引張材料からなる板状の部材である。例えば、薄肉の鋼板、ステンレス板などが使用できる。
本発明のコンクリート床版に用いる引張板1は、ケーブル張力の概念を利用した構造である。すなわち、引張板1に所定の撓み量10を確保しておき、引張板1の上面にコンクリート3を打設して荷重を作用させると、引張板1の面方向に引張り力が発生する。引張板1の固定は、この引張り力に抵抗できるように、その端部を桁部材2に固定する。
この引張り力に対して、引張板1にその許容できる引張強度(例えば降伏強度)まで抵抗させると、引張板1は薄肉部材で済むため経済的である。
<2> Tensile plate The tension plate 1 is a plate-like member made of a tensile material. For example, a thin steel plate or stainless steel plate can be used.
The tension plate 1 used for the concrete slab of the present invention has a structure utilizing the concept of cable tension. That is, when a predetermined deflection amount 10 is secured on the tension plate 1 and the concrete 3 is placed on the upper surface of the tension plate 1 and a load is applied, a tensile force is generated in the surface direction of the tension plate 1. The end of the tension plate 1 is fixed to the girder member 2 so that the tensile force can be resisted.
If the tensile plate 1 is made to resist the tensile force to an allowable tensile strength (for example, yield strength) against this tensile force, the tensile plate 1 is economical because a thin member is sufficient.

以上のような引張部材としての機能を引張板1に求める場合は、引張板1の端部に発生した引張り力に対抗できるように桁部材2に固定しておく必要がある。このため、単に引張板1の直線状の端部を溶接で桁部材2に溶接するのみでは引張り力に対抗できない場合は、例えば引張板1の端部を板の面方向に凹凸となるように成形し、凹凸部11と桁部材2を溶接で結合させる。すなわち、端部を凹凸に成形すると、端部が直線の場合に比べて溶接長を長くすることができるので、結合力を高めることができる。また、凹凸部11を形成する代わりに、溶接による結合と高張力ボルトによる結合を組み合わせるなどしてもよい。   When the function as the tension member as described above is required for the tension plate 1, it is necessary to fix the tension member 1 to the girder member 2 so that the tensile force generated at the end of the tension plate 1 can be countered. For this reason, when it is not possible to counter the tensile force simply by welding the linear end of the tension plate 1 to the girder member 2, for example, the end of the tension plate 1 is uneven in the surface direction of the plate. It shape | molds and the uneven | corrugated | grooved part 11 and the girder member 2 are couple | bonded by welding. That is, when the end portion is formed into an uneven shape, the weld length can be increased as compared with the case where the end portion is a straight line, and thus the bonding force can be increased. Further, instead of forming the concavo-convex portion 11, a combination by welding and a combination by high tension bolts may be combined.

引張板1の撓み量10が大きくなるように設定すると、端部に発生する引張り力も小さくなるため、端部を固定する方法も簡単にできる。しかし、撓み量10が増えた分だけコンクリートの打設量も増加するため、引張板1の固定に要する費用とコンクリート3の打設量を比較して、総費用が最も小さくなるように設計するのが好ましい。
If the bending amount 10 of the tension plate 1 is set to be large, the tensile force generated at the end portion is also reduced, so that the method for fixing the end portion can be simplified. However, since the amount of concrete placement increases as the amount of flexure 10 increases, the cost required to fix the tension plate 1 and the amount of concrete 3 are compared, and the total cost is designed to be the smallest. Is preferred.

実施例では、本発明のコンクリート床版の構築方法について説明する。
まず、桁部材2とそれに交差する交差桁22を格子状に配置する(図3参照)。コンクリート床版と桁部材2の一体化を図る場合には、桁部材2及び交差桁22の上面には、上方に突出するように有孔ジベル板21を取り付けておく方法がある。
そして、桁部材2,2間に引張板1を架け渡す。引張板1には、例えばコンクリート床版の塩害対策として厚さ2mm程度のステンレス板が使用できる。凹凸部11を形成した引張板1の端部を桁部材2,2の上面に設置し、交差桁22と引張板1の端部は重ならないようにする。このように2点支持とすることで、一方向に所定の撓み量10を確保させる。凹凸部11は、凹凸の形状に沿って溶接を行うことで桁部材2,2に固定する。
引張板1を桁部材2,2に固定した後に、鉄筋31を配置する。桁部材2や交差桁22と交差する方向に配置する下側の鉄筋31は、有孔ジベル板21の孔に鉄筋31を通すことで配置でき、コンクリート床版と桁部材2の固定度を高めることができる。
鉄筋31の配置後に引張板1の上面と、桁部材2及び交差桁22の上面を、底面側の埋設型枠としてコンクリート3を打設する。コンクリート3を打設すると、その荷重によって引張板1に引張り力が作用し、桁部材2に力が伝達され、コンクリート床版の形状が保持される。
コンクリート3が硬化すると、桁部材2と引張板1とコンクリート3が一体となったコンクリート床版が完成する。引張板1は埋設型枠となるため、撤去する必要はない。また、コンクリート3の下面が引張板1で被覆されることになるため、コンクリート3の耐久性を向上させることができる。
In the examples, a method for constructing a concrete slab of the present invention will be described.
First, the girder member 2 and the crossing girder 22 that intersects the girder member 2 are arranged in a grid pattern (see FIG. 3). When integrating the concrete floor slab and the girder member 2, there is a method of attaching a perforated dowel plate 21 on the upper surfaces of the girder member 2 and the cross girder 22 so as to protrude upward.
Then, the tension plate 1 is bridged between the girder members 2 and 2. For the tension plate 1, for example, a stainless plate having a thickness of about 2 mm can be used as a countermeasure against salt damage of a concrete floor slab. The end of the tension plate 1 on which the concavo-convex portion 11 is formed is installed on the upper surface of the girder members 2 and 2 so that the cross girder 22 and the end of the tension plate 1 do not overlap. In this way, by using two-point support, a predetermined amount of bending 10 is ensured in one direction. The uneven portion 11 is fixed to the beam members 2 and 2 by welding along the uneven shape.
After the tension plate 1 is fixed to the girder members 2 and 2, the reinforcing bars 31 are arranged. The lower reinforcing bar 31 arranged in the direction crossing the girder member 2 and the crossing girder 22 can be arranged by passing the reinforcing bar 31 through the hole of the perforated gibber plate 21, and the degree of fixation between the concrete floor slab and the girder member 2 is increased. be able to.
After the reinforcing bars 31 are arranged, the concrete 3 is placed using the upper surface of the tension plate 1 and the upper surfaces of the girder member 2 and the crossing girder 22 as the embedded formwork on the bottom surface side. When the concrete 3 is placed, a tensile force acts on the tension plate 1 by the load, the force is transmitted to the girder member 2, and the shape of the concrete slab is maintained.
When the concrete 3 is hardened, a concrete floor slab in which the girder member 2, the tension plate 1, and the concrete 3 are integrated is completed. Since the tension plate 1 becomes an embedded formwork, it is not necessary to remove it. Moreover, since the lower surface of the concrete 3 will be coat | covered with the tension plate 1, durability of the concrete 3 can be improved.

本発明のコンクリート床版の実施例の説明図Explanatory drawing of the Example of the concrete floor slab of this invention コンクリート床版の実施例の断面図Sectional view of a concrete slab embodiment コンクリート床版の実施例の平面図Plan view of concrete slab embodiment 従来のデッキプレートを使用したコンクリート床版の構築方法の実施例の説明図Explanatory drawing of the example of the construction method of the concrete floor slab using the conventional deck plate

符号の説明Explanation of symbols

1・・・引張板
11・・凹凸部
2・・・桁部材
3・・・コンクリート
DESCRIPTION OF SYMBOLS 1 ... Tensile plate 11 ... Uneven part 2 ... Girder member 3 ... Concrete

Claims (2)

現場でコンクリートを打設して構築するコンクリート床版であって、
間隔をおいて配置した複数の桁部材と、
引張部材であって前記桁部材間に架け渡す引張板と、
前記引張板の上面に打設するコンクリートと、からなり、
前記引張板には前記コンクリートの荷重を作用させることによって面方向の引張り力を発生させ、
前記引張り力に対抗できるように、前記引張板の縁端部を凹凸状に形成し、該凹凸部と前記桁部材を溶接によって固定したことを特徴とする、
コンクリート床版。
It is a concrete floor slab that is constructed by placing concrete on site,
A plurality of girder members arranged at intervals, and
A tension plate that spans between the girder members,
A concrete to be placed on the upper surface of the tension plate,
The tensile plate generates a tensile force in the surface direction by applying a load of the concrete,
In order to be able to counter the tensile force, an edge of the tension plate is formed in an uneven shape, and the uneven portion and the girder member are fixed by welding,
Concrete floor slab.
現場でコンクリートを打設して構築するコンクリート床版の構築方法において、
間隔をおいて複数の桁部材を配置し、
引張部材である引張板を前記桁部材間に架け渡し、
前記引張板には前記コンクリートの荷重を作用させることによって面方向の引張り力を発生させ、
前記引張り力に対抗できるように、前記引張板の縁端部を凹凸状に形成した凹凸部を前記桁部材に溶接によって固定し、
前記引張板の上面にコンクリートを打設する、
コンクリート床版の構築方法。
In the construction method of the concrete slab that is constructed by placing concrete on site,
Arrange multiple girder members at intervals,
A tension plate that is a tension member is bridged between the girder members,
The tensile plate generates a tensile force in the surface direction by applying a load of the concrete,
In order to be able to counter the tensile force, the uneven portion formed in the uneven shape of the edge of the tension plate is fixed to the girder member by welding,
Placing concrete on the upper surface of the tension plate,
Construction method for concrete slabs.
JP2004025624A 2004-02-02 2004-02-02 Concrete slab and method for constructing concrete slab Expired - Fee Related JP3668974B1 (en)

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