JPH09209503A - Reinforcing bar cover - Google Patents
Reinforcing bar coverInfo
- Publication number
- JPH09209503A JPH09209503A JP4057896A JP4057896A JPH09209503A JP H09209503 A JPH09209503 A JP H09209503A JP 4057896 A JP4057896 A JP 4057896A JP 4057896 A JP4057896 A JP 4057896A JP H09209503 A JPH09209503 A JP H09209503A
- Authority
- JP
- Japan
- Prior art keywords
- reinforcing bar
- bar cover
- cover according
- cover
- thermoplastic resin
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、鉄筋コンクリート
建造物を建設する際の場所打ちコンクリート杭工法で用
いられる鉄筋を保護するためのカバーに関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a cover for protecting rebar used in a cast-in-place concrete pile method when constructing a reinforced concrete structure.
【０００２】[0002]
【従来の技術】従来から、コンクリート打設工法による
建造が行なわれているが、たとえばアースドリル拡底工
法では、拡底部掘削後、一次孔底処理して鉄筋かごを建
込み、トレミーを挿入し、さらに二次孔底処理した後、
コンクリートを打設する。このコンクリート打設時に、
該鉄筋トップ付近の余盛部分となる約１〜２ｍの部分
に、鉄筋を保護するためにフィルムや布帛などを巻き付
けていたものである。2. Description of the Related Art Conventionally, construction by a concrete placing method has been carried out. For example, in the earth drill bottom expanding method, after excavating the bottom expanding part, the primary hole bottom treatment is performed and the reinforcing bar cage is installed and the tremie is inserted. After further secondary hole bottom treatment,
Pour concrete. When placing this concrete,
A film, cloth, etc. were wound around a portion of about 1 to 2 m, which is an extra portion near the top of the reinforcing bar, in order to protect the reinforcing bar.
【０００３】すなわち、コンクリート打設工法によれ
ば、生コン注入に際して最上部に泥水を含むコンクリー
トが残ることになるので、余分に生コンを注入するもの
である。この余盛部分は、コンクリート硬化後取り除か
れるものであるが、鉄筋カバーを用いた部分は、主筋と
コンクリートの縁切りができ、コンクリートのハツリ作
業の作業性に大きく影響するものであり、かつ、この取
り除き作業の際に鉄筋を損傷することが多かった。That is, according to the concrete pouring method, since concrete containing muddy water remains on the uppermost portion when pouring fresh concrete, extra raw concrete is poured. This extra part is to be removed after the concrete is hardened, but the part using the reinforcing bar cover can cut the edge of the main bar and the concrete, which greatly affects the workability of the chipping work of concrete, and Reinforcing bars were often damaged during removal work.
【０００４】[0004]
【発明が解決しようとする課題】しかし、従来から使用
されていたフィルムや布帛では、薄くて破れ易く、クッ
ション性もないので、鉄筋保護機能も満足なものではな
く、余盛部分のコンクリート取り除き作業での鉄筋の損
傷を押えることはできなかった。その上、フィルムや布
帛を鉄筋に取り付けるのに労力と時間を要し、作業性に
大きく影響を与える欠点を有していた。However, the conventionally used films and cloths are thin, easy to tear, and have no cushioning property. Therefore, the reinforcing bar protecting function is not satisfactory, and the work for removing concrete from the extra portion is not performed. I couldn't suppress the damage of the rebar in. In addition, it takes labor and time to attach the film or cloth to the reinforcing bar, which has a drawback that workability is greatly affected.
【０００５】本発明は、上述の従来技術の背景に鑑み、
多少大き目のカバーでも、鉄筋から抜け落ちにくい機能
を十分に有するので、少ない種類のカバーで工事を完成
させ得る上に、標識線によって適合するカバーを簡単に
見分けられる、優れたクッション性を有する鉄筋カバー
を提供せんとするものである。The present invention has been made in view of the background of the above-mentioned prior art.
Even with a slightly larger cover, it has enough function to prevent it from coming off the rebar, so the work can be completed with a small number of types of cover, and also a rebar cover with excellent cushioning properties that makes it easy to identify the cover that matches the marking line. Is intended to be provided.
【０００６】[0006]
【課題を解決するための手段】本発明は、かかる課題を
解決するために、次のような手段を採用する。The present invention employs the following means in order to solve the above problems.
【０００７】すなわち、本発明の鉄筋カバーは、熱可塑
性樹脂発泡体製筒状体であって、該筒状体の断面が楕円
形状を有することを特徴とするものである。That is, the reinforcing bar cover of the present invention is a tubular body made of a thermoplastic resin foam, and the tubular body has an elliptical cross section.
【０００８】[0008]
【発明の実施の形態】本発明は、従来、フィルムや布帛
などを巻き付けていた鉄筋カバーを、作業性、クッショ
ン性に優れたもので、しかも抜け落ちにくいものにせん
と、鋭意検討したところ、かかるカバーを多孔質発泡体
で構成してクッション性を付与し、さらに、楕円形状に
構成したことで、抜け落ちにくさを一挙に改善し得たも
のである。BEST MODE FOR CARRYING OUT THE INVENTION The present invention has been earnestly studied to find that a reinforcing bar cover, which has conventionally been wrapped with a film or cloth, has excellent workability and cushioning properties and is hard to come off. Since the cover is made of a porous foam to provide cushioning properties and further has an elliptical shape, it is possible to improve the difficulty of slipping off at once.
【０００９】本発明の鉄筋カバーは、場所打ちコンクリ
ート杭工法で用いられる鉄筋を保護するためのカバーで
あり、熱可塑性樹脂発泡体製筒状体で、かつ、断面が楕
円形状を有するところに特徴を有する。The reinforcing bar cover of the present invention is a cover for protecting reinforcing bars used in the cast-in-place concrete pile method, and is characterized by being a tubular body made of a thermoplastic resin foam and having an elliptical cross section. Have.
【００１０】かかる熱可塑性樹脂発泡体は、ポリスチレ
ン系、ポリオレフィン系などの樹脂発泡体で構成される
が、かかる熱可塑性樹脂発泡体の中でもポリオレフィン
系樹脂発泡体が好ましい。たとえば、ポリエチレン、ポ
リプロピレン、エチレンプロピレン共重合体、エチレン
酢酸ビニル共重合体の単独、あるいはこれらを混合した
樹脂組成物を押出機で溶融し、フロンガス等の蒸発型発
泡剤を圧入混合した後、筒状に押出すと同時に発泡して
得られる無架橋のポリオレフィン系樹脂発泡体製筒状体
が好適である。あるいはポリオレフィン系樹脂にアゾジ
カルボンアミド等の熱分解型発泡剤を混合し、溶融押出
ししてシート状とし、電子線照射後、加熱発泡して得ら
れるシート状の電子線架橋発泡体、またはポリオレフィ
ン系樹脂に熱分解型発泡剤と過酸化物やシラン化合物等
の化学架橋剤を混合し、溶融押出ししてシート状とした
後、加熱発泡して得られるシート状の化学架橋発泡体
を、加熱し筒状に丸めると同時に端面を溶着し筒状とし
たものであってもよい。これらの発泡体は通常独立気泡
構造を有する。The thermoplastic resin foam is composed of polystyrene-based or polyolefin-based resin foams, and among the thermoplastic resin foams, polyolefin-based resin foams are preferable. For example, polyethylene, polypropylene, an ethylene-propylene copolymer, an ethylene-vinyl acetate copolymer alone, or a resin composition obtained by mixing these is melted in an extruder, and an evaporative foaming agent such as Freon gas is press-mixed, and then a cylinder is formed. A tubular body made of a non-crosslinked polyolefin-based resin foam, which is obtained by extruding into a circular shape and foaming at the same time, is suitable. Alternatively, a sheet-shaped electron beam crosslinked foam obtained by mixing a heat-decomposable foaming agent such as azodicarbonamide with a polyolefin resin, melt-extruding the mixture into a sheet, and heating and foaming after irradiation with an electron beam, or a polyolefin-based resin A thermally decomposable foaming agent and a chemical cross-linking agent such as a peroxide or a silane compound are mixed with the resin, and the mixture is melt-extruded to form a sheet, which is then heat-foamed to heat the sheet-like chemically cross-linked foam. Alternatively, the end face may be welded at the same time as being rolled into a tubular shape to form a tubular shape. These foams usually have a closed cell structure.
【００１１】かかる熱可塑性樹脂発泡体の発泡倍率は５
〜１００倍が好ましく、さらに１０〜４０倍であるもの
が強度やクッション性の上から好ましい。The expansion ratio of such thermoplastic resin foam is 5
It is preferably -100 times, more preferably 10 to 40 times from the viewpoint of strength and cushioning property.
【００１２】かかる発泡体は、該発泡体単独でもよい
が、好ましくはフィルムや繊維、布帛で、外層、中層、
内層の少なくとも１層を補強した構造のものも好ましく
使用される。かかる筒状体は、２〜１０mmの範囲の肉厚
を有する発泡体が好ましい。The foam may be the foam alone, but is preferably a film, a fiber, or a cloth, and has an outer layer, a middle layer,
A structure in which at least one of the inner layers is reinforced is also preferably used. The tubular body is preferably a foam having a wall thickness in the range of 2 to 10 mm.
【００１３】本発明の鉄筋カバーは、断面が楕円形状を
有するところに特徴を有する。具体的にいえば、該筒状
体を、楕円の断面形状に押し潰したものが使用される。
すなわち、本発明の鉄筋カバーは、図１のような楕円形
状としたものであって、長径（ａ）と短径（ｂ）比（ａ
／ｂ）が、好ましくは１．２〜５、さらに好ましくは
１．５〜２．５の範囲にあるものが、抜け落ちにくさの
上から好ましく使用される。すなわち、かかる楕円形状
としたことにより、鉄筋に多少の太さ誤差があっても、
抜け落ちることなく、自力で自重に勝って問題なくカバ
ーする性質を有するのである。The reinforcing bar cover of the present invention is characterized in that it has an elliptical cross section. Specifically, a tubular body is used that is crushed into an elliptical sectional shape.
That is, the reinforcing bar cover of the present invention has an elliptical shape as shown in FIG. 1, and has a major axis (a) and a minor axis (b) ratio (a
/ B) is preferably in the range of 1.2 to 5, and more preferably in the range of 1.5 to 2.5, because it is difficult to slip out. That is, by adopting such an elliptical shape, even if there is some thickness error in the reinforcing bar,
It has the property that it does not fall out and it can overcome its own weight and cover it without problems.
【００１４】押し潰す方法は、無架橋のポリオレフィン
系樹脂発泡体の場合は、押出し直後に２枚の板状体に挟
む方法、またはシート状発泡体を筒状に丸める場合は、
偏平状の口金を通して筒状に丸める方法がとられる。As for the crushing method, in the case of a non-crosslinked polyolefin resin foam, a method of sandwiching it between two plate-like bodies immediately after extrusion, or when rolling the sheet-like foam into a tubular shape,
A method of rolling into a tubular shape through a flat-shaped base is adopted.
【００１５】かかる筒状体には、長手方向の表面に標識
線を有するもの、さらには識別用に少なくとも表面が着
色されているものが好ましく使用される。すなわち、か
かる標識線や着色そのものが、該中空体の内径、肉厚、
外径および偏平率の少なくとも１つを意味するように設
定すれば、実用に際して見分けが極めて簡単容易でよ
い。As such a cylindrical body, one having a marking line on the surface in the longitudinal direction and one having at least the surface colored for identification are preferably used. That is, the marking line or coloring itself is the inner diameter of the hollow body, the wall thickness,
If it is set so as to mean at least one of the outer diameter and the flattening rate, it will be very easy and easy to distinguish in practical use.
【００１６】本発明の鉄筋カバーは、場所打ちコンクリ
ート杭工法で用いられ、まず所定の位置を掘削すること
から始まる。次に、鉄筋かごを組立てた後、上部相当部
の主筋に本発明の鉄筋カバーを差込み、該カバーの長手
方向の２〜３ケ所を番線で巻き締て固定する。次に先に
組立てた鉄筋かごを掘削部に建て込み、コンクリートを
流し込む。コンクリートが硬化したら、余盛部のコンク
リートをはつる。すなわち、一般に杭頭のコンクリート
余盛部は泥水を含むので、強度が不充分であるために、
硬化後、この部分のコンクリートは除去されるものであ
る。このときに、本発明の鉄筋カバーを固定しておけ
ば、該カバー部分は主筋とコンクリートとの縁切りがで
き、はつり作業が容易にできるのである。該余盛部のコ
ンクリートをはつった後、基礎コンクリートを打つ。The reinforcing bar cover of the present invention is used in the cast-in-place concrete pile method, and it starts by excavating a predetermined position. Next, after assembling the cage of the reinforcing bar, the reinforcing bar cover of the present invention is inserted into the main bar of the upper portion, and the cover is fixed by winding 2 to 3 places in the longitudinal direction with a number line. Next, the previously assembled reinforcing bar cage is built in the excavation section and concrete is poured. Once the concrete has hardened, peel off the extra concrete. That is, since the piled-up concrete portion of the pile head generally contains muddy water, its strength is insufficient.
After hardening, the concrete in this part is to be removed. At this time, if the reinforcing bar cover of the present invention is fixed, the edge of the main bar and concrete can be cut off in the cover part, and the chipping work can be facilitated. After the concrete in the surplus portion is set, the concrete is poured.
【００１７】次に、本発明の鉄筋カバーの製造方法の一
例について説明するが、これに限定されるものではな
い。Next, an example of the method for manufacturing the reinforcing bar cover of the present invention will be described, but the method is not limited to this.
【００１８】ポリオレフィン系樹脂を押出機で溶融し、
蒸発型発泡剤を圧入混合した後、円形スリットダイから
押出すと同時に発泡して筒状の発泡体をを得る。この得
られた筒状発泡体を、必要ならば延伸しながら冷却する
か、およびまたは、加圧圧縮して楕円形状にする。好ま
しくは約１〜３ｍ、さらに好ましくは１〜２ｍの所定の
長さにカットして鉄筋カバーとする。The polyolefin resin is melted by an extruder,
After the evaporative foaming agent is press-mixed, it is extruded from a circular slit die and simultaneously foamed to obtain a tubular foam. The resulting tubular foam is cooled, if necessary while stretching, and / or compressed under pressure into an elliptical shape. The reinforcing bar cover is preferably cut into a predetermined length of about 1 to 3 m, more preferably 1 to 2 m.
【００１９】[0019]
【実施例】以下、実施例、比較例にて本発明をさらに詳
細に説明する。◎ 実施例１ ＭＦＲ（メルトフローレート）２．０ｇ／10min 、密度
０．９２５ｇ／cm3 である低密度ポリエチレン１００ｋ
ｇ、タルク０．４ｋｇ、ステアリン酸亜鉛０．４ｋｇを
転倒式混合器により混合した後、タンデム押出機（第１
押出機：５５φ、第２押出機７５φ）に供給した。第１
押出機のシリンダー内部にフロンガス（Ｒ１４２ｂ／Ｒ
２２＝６０／４０の混合ガス）を圧入し、溶融樹脂と混
合し、円形スリットダイから押出すと同時に発泡し、円
筒状の連続発泡体を得た。EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. ◎ Example 1 Low density polyethylene 100k having MFR (melt flow rate) of 2.0 g / 10 min and density of 0.925 g / cm 3.
g, talc 0.4 kg, and zinc stearate 0.4 kg by mixing with an inversion mixer, and then a tandem extruder (first
Extruder: 55φ, second extruder 75φ). First
CFC inside the extruder cylinder (R142b / R
22 = 60/40 mixed gas) was pressed in, mixed with the molten resin, extruded from a circular slit die and simultaneously foamed to obtain a cylindrical continuous foam.
【００２０】このときの溶融樹脂の吐出量は２８ｋｇ／
hr、フロンガスの供給量は約９ｋｇ／hrであった。The discharge amount of the molten resin at this time is 28 kg /
The supply rate of hr and CFC gas was about 9 kg / hr.
【００２１】押出直後の円筒状発泡体を上下の間隙を１
８mmに設定した２組のベルトコンベア（長さ６５cm）に
挟みながら引き取り、偏平状の筒状発泡体を得た。偏平
状とした筒状発泡体の表面に黒の油性インクを当接せし
めて長手方向に直線状の標識線を記入した。次いで、長
さを１ｍにカットして鉄筋カバーとした。Immediately after extruding, the cylindrical foam is made to have a gap of 1 above and below.
It was pulled while being sandwiched between two sets of belt conveyors (length: 65 cm) set to 8 mm to obtain a flat tubular foam. A black oil-based ink was brought into contact with the surface of the flat tubular foam, and a linear marker line was drawn in the longitudinal direction. Then, the length was cut to 1 m to obtain a reinforcing bar cover.
【００２２】かくして得られた鉄筋カバーは、内径２７
mm、外径３５mm、厚さ４mm、偏平率（ａ／ｂ）が１．６
であった。また、見掛密度は、０．０２８ｇ／cm3 で、
発泡倍率は約３５倍であった。The reinforcing bar cover thus obtained has an inner diameter of 27
mm, outer diameter 35 mm, thickness 4 mm, flatness (a / b) is 1.6
Met. The apparent density is 0.028 g / cm 3 ,
The expansion ratio was about 35 times.
【００２３】この鉄筋カバーを外径２２mmの鉄筋と、外
径１９mmの鉄筋に、それぞれ差し込んでみたところ、い
ずれの鉄筋からも抜け落ちにくい性質を有することが確
認された。また、標識線は、内径２７mmの製品を識別す
るためのものであり、他の製品と混在しても簡単に識別
することができた。 比較例１ 実施例１において、ベルトコンベアで偏平化処理しない
ものを用意した。このカバーは、ほぼ真円形状（偏平率
＝１．１）のものであった。このカバーに外径２２mm、
１９mmの２種の鉄筋を差し込んだところ、前者では抜け
落ちなかったが、後者は抜け落ちてしまった。When this rebar cover was inserted into a rebar having an outer diameter of 22 mm and a rebar having an outer diameter of 19 mm, it was confirmed that the rebar cover had a property of being hard to slip off from any rebar. Further, the marker line is for identifying a product having an inner diameter of 27 mm and can be easily identified even when mixed with other products. Comparative Example 1 In Example 1, a belt conveyor that was not flattened was prepared. The cover had a substantially circular shape (flatness ratio = 1.1). This cover has an outer diameter of 22 mm,
When inserting two types of 19 mm rebar, the former did not fall out, but the latter fell out.
【００２４】[0024]
【発明の効果】本発明によれば、外径に多少差異のある
鉄筋でも抜け落ちることなくカバーでき、サイズ種類の
少ないカバーで幅広く鉄筋をカバーすることができ、主
筋とコンクリートとの縁切りができるので、はつり作業
が簡単容易にできる利点がある。EFFECTS OF THE INVENTION According to the present invention, it is possible to cover even rebars having a slightly different outer diameter without falling out, it is possible to cover a wide range of rebars with a cover of a small size, and it is possible to cut the edge between the main bar and concrete. There is an advantage that the picking work is easy and easy.
【図１】この図は、本発明の鉄筋カバーの長径と短径を
示す断面図である。FIG. 1 is a sectional view showing a major axis and a minor axis of a reinforcing bar cover of the present invention.
ａ：長径 ｂ：短径 a: major axis b: minor axis
Claims (11)
筒状体の断面が楕円形状を有することを特徴とする鉄筋
カバー。1. A reinforcing bar cover, which is a tubular body made of a thermoplastic resin foam, wherein the tubular body has an elliptical cross section.
比（ａ／ｂ）が１．２〜５の範囲にあるものである請求
項１記載の鉄筋カバー。2. The reinforcing bar cover according to claim 1, wherein the elliptical shape has a ratio (a / b) of the major axis (a) to the minor axis (b) in the range of 1.2 to 5.
比（ａ／ｂ）が１．５〜２．５の範囲にあるものである
請求項１記載の鉄筋カバー。3. The reinforcing bar cover according to claim 1, wherein the elliptical shape has a ratio (a / b) of the major axis (a) to the minor axis (b) in the range of 1.5 to 2.5.
する請求項１記載の鉄筋カバー。4. The reinforcing bar cover according to claim 1, wherein the tubular body has a wall thickness in the range of 2 to 10 mm.
１記載の鉄筋カバー。5. The reinforcing bar cover according to claim 1, wherein the cylindrical body has a marking wire on its surface.
色されている請求項１記載の鉄筋カバー。6. The reinforcing bar cover according to claim 1, wherein at least the surface of the tubular body is colored for identification.
は着色が、該中空体の、内径、肉厚、外径および偏平率
の少なくとも１つを意味するものである鉄筋カバー。7. The reinforcing bar cover according to claim 5, wherein the marking line or coloring means at least one of an inner diameter, a wall thickness, an outer diameter and a flatness of the hollow body.
である請求項１記載の鉄筋カバー。8. The reinforcing bar cover according to claim 1, wherein the thermoplastic resin is a polyolefin resin.
ロピレン、エチレンプロピレン共重合体、エチレン酢酸
ビニル共重合体の単独あるいはこれらの混合物から選ば
れた少なくとも１種である請求項８記載の鉄筋カバー。9. The reinforcing bar cover according to claim 8, wherein the thermoplastic resin is at least one selected from polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, or a mixture thereof.
ンである請求項８記載の鉄筋カバー。10. The reinforcing bar cover according to claim 8, wherein the thermoplastic resin is non-crosslinked polyethylene.
は繊維で補強されたものである請求項１記載の鉄筋カバ
ー。11. The reinforcing bar cover according to claim 1, wherein the thermoplastic resin foam is reinforced with a film or a fiber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4057896A JPH09209503A (en) | 1996-02-01 | 1996-02-01 | Reinforcing bar cover |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4057896A JPH09209503A (en) | 1996-02-01 | 1996-02-01 | Reinforcing bar cover |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09209503A true JPH09209503A (en) | 1997-08-12 |
Family
ID=12584381
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4057896A Pending JPH09209503A (en) | 1996-02-01 | 1996-02-01 | Reinforcing bar cover |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09209503A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2464220A (en) * | 2009-12-11 | 2010-04-14 | Martin Ansell | Safety cover for concrete reinforcement bars |
| CN106368388A (en) * | 2015-07-23 | 2017-02-01 | 中国华冶科工集团有限公司 | Steel bar protection apparatus |
| CN110331725A (en) * | 2019-04-25 | 2019-10-15 | 黄宗海 | A kind of construction method of water proof pouring underwater concrete |
| CN113293859A (en) * | 2021-04-21 | 2021-08-24 | 中国化学工程第三建设有限公司 | Recyclable foundation bolt group pre-embedding positioning device and method |
-
1996
- 1996-02-01 JP JP4057896A patent/JPH09209503A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2464220A (en) * | 2009-12-11 | 2010-04-14 | Martin Ansell | Safety cover for concrete reinforcement bars |
| GB2464220B (en) * | 2009-12-11 | 2010-08-25 | Martin Ansell | An arrangement including concrete reinforcement bars and a safety device |
| CN106368388A (en) * | 2015-07-23 | 2017-02-01 | 中国华冶科工集团有限公司 | Steel bar protection apparatus |
| CN106368388B (en) * | 2015-07-23 | 2019-08-02 | 中国华冶科工集团有限公司 | Reinforcing bar protective device |
| CN110331725A (en) * | 2019-04-25 | 2019-10-15 | 黄宗海 | A kind of construction method of water proof pouring underwater concrete |
| CN113293859A (en) * | 2021-04-21 | 2021-08-24 | 中国化学工程第三建设有限公司 | Recyclable foundation bolt group pre-embedding positioning device and method |
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