JP2009126731A - Cement hardened body and manufacturing method thereof - Google Patents
Cement hardened body and manufacturing method thereof Download PDFInfo
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- JP2009126731A JP2009126731A JP2007301153A JP2007301153A JP2009126731A JP 2009126731 A JP2009126731 A JP 2009126731A JP 2007301153 A JP2007301153 A JP 2007301153A JP 2007301153 A JP2007301153 A JP 2007301153A JP 2009126731 A JP2009126731 A JP 2009126731A
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- 239000004568 cement Substances 0.000 title claims abstract description 72
- 238000004519 manufacturing process Methods 0.000 title claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims abstract description 8
- 239000000203 mixture Substances 0.000 claims description 39
- 238000005336 cracking Methods 0.000 abstract description 7
- 230000015572 biosynthetic process Effects 0.000 abstract 1
- 238000005266 casting Methods 0.000 abstract 1
- 230000002950 deficient Effects 0.000 abstract 1
- 239000011435 rock Substances 0.000 abstract 1
- 238000000034 method Methods 0.000 description 18
- 239000003365 glass fiber Substances 0.000 description 11
- 239000000835 fiber Substances 0.000 description 8
- 239000011433 polymer cement mortar Substances 0.000 description 8
- 238000009415 formwork Methods 0.000 description 5
- 239000003513 alkali Substances 0.000 description 4
- 239000004567 concrete Substances 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000011230 binding agent Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- 239000012209 synthetic fiber Substances 0.000 description 3
- 229920002994 synthetic fiber Polymers 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000011247 coating layer Substances 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 238000000576 coating method Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- HNPDNOZNULJJDL-UHFFFAOYSA-N ethyl n-ethenylcarbamate Chemical compound CCOC(=O)NC=C HNPDNOZNULJJDL-UHFFFAOYSA-N 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 239000010410 layer Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 description 1
- 239000011505 plaster Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 230000000452 restraining effect Effects 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 229920002803 thermoplastic polyurethane Polymers 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
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Abstract
Description
本発明はセメント硬化体に関する。 The present invention relates to a hardened cement body.
例えば、セメントや高炉スラグ等の水硬性物質を結合材としたモルタル、コンクリート、セメントペースト等のセメント組成物の硬化体（以下、セメント硬化体）は、セメント等の結合材が硬化する過程で発生する水和熱や自己収縮・乾燥収縮などの影響によって、ひび割れが発生していることは周知の通りである。 For example, hardened bodies of cement compositions such as mortar, concrete, and cement paste (hereinafter referred to as hardened cement) that use hydraulic substances such as cement and blast furnace slag as binders are generated in the process of hardening of binders such as cement. It is well known that cracks are generated due to the effects of heat of hydration and self-shrinkage / dry shrinkage.
このひび割れを抑制（防止）する為、繊維で出来たネットをセメント硬化体中に埋設しておくことが提案されている。例えば、アスファルト含浸紙よりなる防水シート材の片面全体に、ビニルウレタン樹脂エマルジョンを主体とし微細粉末状の無機成分を混合した混合組成物を塗布し乾燥したモルタル接着性の塗層を設け、該塗層内には合成繊維などの補強繊維を網目状に含有せしめてなることを特徴としたモルタル施工用の下地シートが提案（実公昭５９−２４７５２号公報）提案されている。又、セメント系スラリーをスリットから平板状に吐出せしめ、振動成型板により圧密化する前および／または後に耐アルカリ性ガラス繊維ネットを埋設してなり、前記ガラス繊維ネットは目付３０〜２００ｇ／ｍ２で、かつ、目間隔５〜２０ｍｍであることを特徴とするガラス繊維強化セメント板の製造方法が提案（特公昭６０−３２５６９号公報）提案されている。又、建築物躯体の表面に左官用塗材の塗層を形成させるための建築物への下地塗り施工方法において、建築物躯体の塗面にポリマーセメントモルタルを塗ること、次いでそのポリマーセメントモルタルの未乾燥状態においてその表面に合成繊維ネットを張り鏝によってポリマーセメントモルタルを補充しながら表面に沿って鏝を滑らかに動かしネットを埋入すること、ポリマーセメントモルタルの乾燥後そのポリマーセメントモルタル内に鋲を打ち込み、鋲頭部でネット埋入ポリマーセメントモルタルの外表面を抑えること、最後に前記ネット埋入ポリマーセメントモルタル及び鋲頭部の外側に第２のポリマーセメントモルタルを塗り付けることを含む工程により建築物躯体にポリマーセメントモルタル塗層を接合することを特徴とする建築物への下地塗り施工方法が提案（特公平８−３０３８１号公報）提案されている。
さて、ネットを埋設したセメント硬化体とネットを埋設していないセメント硬化体とを比べると、ネットを埋設したセメント硬化体のひび割れが抑制されていることは明らかであった。 Now, comparing the hardened cement body with the net embedded and the hardened cement body without the net embedded, it was clear that cracking of the hardened cement body with the net embedded was suppressed.
ところで、これまでに提案の技術は、繊維製ネットをセメント硬化体における主面に沿って全面に亘って設け、これによってひび割れ防止を図っているものである。 By the way, the technique proposed so far provides a fiber net over the entire surface along the main surface of the hardened cement body, thereby preventing cracks.
しかしながら、全面に亘ってネットを配設する作業は大変である。すなわち、作業効率が非常に悪い。そして、コストも高く付く。 However, the work of arranging the net over the entire surface is difficult. That is, work efficiency is very bad. And the cost is high.
かつ、型枠内に全面的に張られたネット上からセメント組成物を流し込もうとした場合、セメント組成物がネットの目に引っ掛り、即ち、目詰まりを引き起こすようになり、特に、セメント組成物における粗骨材などは目詰まりを引き起こす可能性が高く、その結果、所謂、ジャンカ等の打設不良を引き起こす恐れが高い。そして、こうなってしまうと、ひび割れ防止とは言っておれない。 In addition, when trying to pour the cement composition from the net stretched entirely in the formwork, the cement composition gets caught in the net, i.e., clogs. Coarse aggregates and the like in the composition are highly likely to cause clogging, and as a result, there is a high risk of causing poor placement of so-called jumpers. And if this is the case, it cannot be said to prevent cracking.
従って、本発明が解決しようとする課題は、ひび割れ防止を効果的に抑制でき、かつ、ジャンカ等の打設不良も改善される技術を提供することである。 Therefore, the problem to be solved by the present invention is to provide a technique capable of effectively suppressing cracking prevention and improving a placement failure such as a jumper.
前記の課題は、ネット状帯が格子状に配設されてなる
ことを特徴とするセメント硬化体によって解決される。
The above-mentioned problem is solved by a hardened cement body in which net-like bands are arranged in a lattice pattern.
又、セメント硬化体における鉄筋にネット状帯が取り付けられて該ネット状帯が格子状に配設されてなる
ことを特徴とするセメント硬化体によって解決される。
Further, the problem is solved by a hardened cement body characterized in that a net-like band is attached to a reinforcing bar in the hardened cement body, and the net-like band is arranged in a lattice shape.
又、上記のセメント硬化体であって、好ましくは、ネット状帯の幅の２〜４０倍の間隔を開けて該ネット状帯が格子状に配設されてなることを特徴とするセメント硬化体によって解決される。 Also, the hardened cement body, preferably the hardened cement body, wherein the net-like belts are arranged in a lattice pattern with an interval of 2 to 40 times the width of the net-like belts. Solved by.
又、格子状にネット状帯を配設するネット状帯配設工程と、
前記ネット状帯が格子状に配設された箇所にセメント組成物を供給するセメント組成物供給工程
とを具備することを特徴とするセメント硬化体の製造方法によって解決される。
In addition, a net-like band arranging step of arranging a net-like band in a lattice shape,
This is solved by a method for producing a hardened cement body, comprising a cement composition supplying step of supplying a cement composition to a place where the net-like band is arranged in a grid pattern.
又、未硬化のセメント組成物中にネット状帯を格子状に埋設する埋設工程
を具備することを特徴とするセメント硬化体の製造方法によって解決される。
Moreover, it solves by the manufacturing method of the hardened cement body characterized by including the embedding process which embeds a net-like strip | belt in a grid | lattice form in an unhardened cement composition.
本発明のセメント硬化体は、ネット状帯が格子状に配設されてなるから、ひび割れが効果的に抑制される。しかも、ネット状帯が格子状に配設されてなるから、格子における開口からセメント組成物は型枠内の下部まで流れ落ち、ネット状帯によってセメント組成物が邪魔され難く、即ち、セメント組成物が均一に供給されるから、ジャンカと言った欠陥も起き難い。従って、本発明になるセメント硬化体の強度は優れた特長を奏する。 In the hardened cement body of the present invention, since the net-like belts are arranged in a lattice shape, cracks are effectively suppressed. Moreover, since the net-like belts are arranged in a lattice pattern, the cement composition flows down from the openings in the lattice to the lower part of the mold, and the cement composition is not easily disturbed by the net-like belts. Since it is supplied uniformly, it is difficult for defects such as janka to occur. Therefore, the strength of the hardened cement body according to the present invention has an excellent feature.
本発明になるセメント硬化体は、例えばセメントや高炉スラグ等の水硬性物質を結合材としたモルタル、コンクリート、セメントペースト等のセメント組成物の硬化体である。そして、ネット状帯が格子状に配設された（張られた）ものである。例えば、鉄筋にネット状帯が取り付けられて格子状に配設された（張られた）ものである。ここで、格子状とは、好ましくは、ネット状帯の幅の２〜４０倍の間隔を開けて配設された（張られた）ものである。更に好ましくは、約５倍以上（特に、７倍以上。そして、２０倍以下）の間隔を開けて格子状に設けられた（張られた）ものである。ここで、ネット状帯の幅の２〜４０倍の間隔を開けて該ネット状帯が格子状に配設されてなるのが好ましいのは、間隔が２倍未満の小さな寸法であると、全面に亘っての敷設に近いものとなって、本発明の特長が奏され難く、逆に、４０倍を越えて大きな寸法のものになってしまうと、ひび割れ抑制効果が小さくなるからである。 The cement hardened body according to the present invention is a hardened body of a cement composition such as mortar, concrete, cement paste and the like using a hydraulic substance such as cement or blast furnace slag as a binder. The net-like band is arranged (stretched) in a lattice shape. For example, a net-like band is attached to a reinforcing bar and is arranged (tensioned) in a lattice shape. Here, the lattice shape is preferably arranged (stretched) with an interval of 2 to 40 times the width of the net-like band. More preferably, they are provided (stretched) in a lattice pattern with an interval of about 5 times or more (particularly 7 times or more and 20 times or less). Here, it is preferable that the net-like strips are arranged in a lattice pattern with an interval of 2 to 40 times the width of the net-like strips. This is because the advantage of the present invention is hardly exhibited, and conversely, if the size is larger than 40 times, the effect of suppressing cracking is reduced.
本発明において、ネット状帯は、好ましくは一つの方向に長いテープ状のものである。従って、所定の幅を持つ。この幅は、好ましくは１００〜１０００ｍｍ（特に、１２０〜５００ｍｍ）である。又、本発明において、ネット状帯は、例えば網目状のものである。すなわち、ネット状帯は、例えば少なくとも二つの方向に存する糸（ここでは、単に、糸と称しているが、これは、繊維そのものであったり、複数本の繊維が撚られたものであったり、或いは複数本の繊維が撚られたものが更に撚られたものであったり、或いは紐や幅狭なシート状のものであったりする。）が交差した網である。この場合、短手方向（横方向）の糸１本に対して長手方向（縦方向）の糸が１本の割合でネット状帯が編まれたものでも良いが、短手方向（横方向）の糸１本に対して長手方向（縦方向）の糸が複数本の割合で編まれたネット状帯の方がひび割れ防止の観点からは好ましい。尚、上記ネット状帯を構成する糸には、アラミド繊維などの合成繊維、炭素繊維、ガラス繊維などの弾性係数が高い繊維を、適宜、選択できる。但し、セメントとの親和性やコストを鑑みると、ガラス繊維製の糸が好ましい。中でも、耐アルカリ性のガラス繊維が好ましい。例えば、酸化ジルコニウム（ＺｒＯ２）を１４質量％以上含有するガラス繊維が挙げられる。或いは、糸を用いて網状に織る代わりに、所定幅のシートに所定広さの開口部を形成したものでも良い。又は、シートを、所謂、エキスバンドメタルの如くに構成させることによって網目状に構成したものでも良い。要するに、一つの方向に長手のものであって、これに開口部が無数に有るものであれば良い。開口部の形状は如何なるものでも良い。例えば、三角形、四角形、五画形、六角形と言った多角形が代表的なものとして挙げられる。但し、ネット状帯（網状帯）の作製コストを鑑みたならば、ネット状帯（網状帯）における開口部の好ましい形状は四角形である。そして、四角形であっても、本発明の特長は十分に奏され、問題は無い。前記開口部は、次のような特徴のものであることが好ましい。例えば、（ネット状帯における開口部の中の縦１０ｍｍ以上で横１０ｍｍ以上の大きさの開口部の全面積）／（ネット状帯の全面積）が０．２〜０．９（特に、０．４〜０．８）である。又、縦１０ｍｍ以上で横１０ｍｍ以上の開口部の大きさ（矩形換算面積）が１００ｍｍ2〜１００００ｍｍ2（特に、１５０ｍｍ2〜５０００ｍｍ2）である。これは、開口部が上記のような大きさの場合に、ひび割れ抑制効果が一層向上していたからによる。又、ネット状帯の両側のセメント組成物の一体性が高いからである。 In the present invention, the net-like band is preferably in the form of a tape that is long in one direction. Therefore, it has a predetermined width. This width is preferably 100 to 1000 mm (particularly 120 to 500 mm). In the present invention, the net-like band is, for example, a net-like band. That is, the net-like band is, for example, a thread existing in at least two directions (here, simply referred to as a thread, this is a fiber itself or a plurality of fibers twisted, Alternatively, a net in which a plurality of twisted fibers are twisted, or a string or a narrow sheet-like shape is crossed. In this case, a net-like band may be knitted at a ratio of one longitudinal (longitudinal) yarn to one short (lateral) yarn. From the viewpoint of preventing cracking, a net-like band in which a plurality of yarns in the longitudinal direction (longitudinal direction) are knitted at a ratio of one yarn to one yarn is preferred. In addition, as a thread | yarn which comprises the said net-like belt | band | zone, the fiber with high elastic coefficients, such as synthetic fibers, such as an aramid fiber, carbon fiber, glass fiber, can be selected suitably. However, in view of affinity with cement and cost, glass fiber yarn is preferred. Among these, alkali resistant glass fibers are preferable. For example, a glass fiber containing 14% by mass or more of zirconium oxide (ZrO 2 ) can be given. Alternatively, instead of weaving a net using yarn, a sheet having a predetermined width may be formed in a sheet having a predetermined width. Alternatively, the sheet may be configured in a mesh shape by being configured like a so-called expanded metal. In short, it may be long in one direction and has an infinite number of openings. The opening may have any shape. For example, polygons such as a triangle, a quadrangle, a five-stroke shape, and a hexagon are typical examples. However, in view of the production cost of the net-like band (net-like band), the preferred shape of the opening in the net-like band (net-like band) is a quadrangle. And even if it is a quadrangle, the features of the present invention are sufficiently exhibited and there is no problem. The opening preferably has the following characteristics. For example, (total area of the opening having a size of 10 mm or more in the opening in the net-like band and a size of 10 mm or more) / (total area of the net-like band) is 0.2 to 0.9 (in particular, 0 .4 to 0.8). Also, the size of the transverse 10mm or more openings in the longitudinal 10mm or more (rectangular conversion area) 100mm 2 ~10000mm 2 (in particular, 150mm 2 ~5000mm 2) is. This is because the crack suppressing effect was further improved when the opening was as described above. Moreover, it is because the integrity of the cement composition on both sides of the net-like band is high.
本発明になるセメント硬化体の製造方法は、格子状にネット状帯を配設するネット状帯配設工程と、前記ネット状帯が格子状に配設された箇所にセメント組成物を供給するセメント組成物供給工程とを具備する。或いは、未硬化のセメント組成物中にネット状帯を格子状に埋設する埋設工程を具備する。又は、未硬化のセメント組成物中にネット状帯を埋設する埋設工程と、前記ネット状帯が格子状に埋設された未硬化のセメント組成物を所定箇所に供給する供給工程とを具備する。何れの手法をも採用できる。但し、好ましくは前者の手法である。尚、格子状にネット状帯を配設する手法としては、例えば未硬化のセメント組成物の混練物中にネット状帯を格子状に埋設する手法、ネット状帯を格子状に配置した型枠内に未硬化のセメント組成物の混練物を打ち込む手法、ネット状帯を格子状に配置した後でセメント組成物を吹き付ける手法、セメント硬化体表面に接着剤でネット状帯を貼り付ける手法などが考えられる。しかしながら、未硬化のセメント組成物の混練物中にネット状帯を格子状に埋設する手法、ネット状帯を格子状に配置した型枠内に未硬化のセメント組成物の混練物を打ち込む手法が好ましい。そして、型枠内にネット状帯を格子状に配置した後でセメント組成物の混練物を打ち込む場合、型枠の内側にネット状帯を直接あるいはセパレータ若しくは取付具を介して格子状に配置し、この格子状にネット状帯が配置された後で型枠内にセメント組成物を打ち込む手法や、配設された鉄筋にネット状帯を取り付けて格子状に配置し、この後で型枠内にセメント組成物を打ち込む手法を適宜用いることが出来る。 The method for producing a hardened cement body according to the present invention includes a net-like band arranging step of arranging a net-like band in a lattice shape, and supplying a cement composition to a place where the net-like band is arranged in a lattice shape. A cement composition supplying step. Alternatively, an embedding step of embedding a net-like band in a lattice shape in an uncured cement composition is provided. Alternatively, the method includes an embedding step of embedding a net-like band in an uncured cement composition, and a supplying step of supplying an uncured cement composition in which the net-like band is embedded in a lattice shape to a predetermined location. Any method can be adopted. However, the former method is preferred. In addition, as a method of arranging the net-like band in a lattice shape, for example, a method of embedding the net-like band in a lattice shape in a kneaded material of an uncured cement composition, a formwork in which the net-like band is arranged in a lattice shape There are a method of driving a kneaded mixture of uncured cement composition into the inside, a method of spraying the cement composition after arranging the net-like belts in a lattice shape, a method of attaching a net-like belt with an adhesive to the surface of the hardened cement body, etc. Conceivable. However, there is a method of embedding a net-like band in a lattice shape in a kneaded product of an uncured cement composition, and a method of driving a kneaded material of an uncured cement composition into a mold having net-like bands arranged in a lattice shape. preferable. Then, when the kneaded material of the cement composition is driven after the net-like bands are arranged in a grid in the mold, the net-like bands are arranged inside the mold directly or via a separator or a fixture. After the net-like band is arranged in the grid shape, the cement composition is driven into the formwork, or the net-like band is attached to the arranged reinforcing bars and arranged in the lattice form, and then the formwork A method of implanting the cement composition into can be appropriately used.
次に、本発明を具体的に説明する。 Next, the present invention will be specifically described.
図１〜図６は本発明になるセメント硬化体の製造（倉庫土間コンクリートの打設）工程説明図であり、図１は配筋後における説明図、図２はネット状帯を格子状に張っている段階での説明図、図３はネット状帯を格子状に張り終わった段階での説明図、図４，５は格子状に張ったネット状帯の一部拡大説明図、図６はセメント組成物（コンクリート組成物）を打設している段階での説明図である。図７はネット状帯がロール状に巻回されている状態の斜視図である。 1 to 6 are explanatory diagrams of the process for producing a hardened cement body according to the present invention (placement of concrete for warehouse soil), FIG. 1 is an explanatory diagram after bar arrangement, and FIG. 2 is a net-like band stretched in a lattice shape. FIG. 3 is an explanatory diagram at the stage where the net-like band has been stretched into a lattice shape, FIGS. 4 and 5 are partially enlarged explanatory diagrams of the net-like belt stretched in a lattice shape, and FIG. It is explanatory drawing in the stage which is placing the cement composition (concrete composition). FIG. 7 is a perspective view showing a state in which the net-like belt is wound in a roll shape.
先ず、図１に示される通り、所定の個所、例えば５５ｍ×２３ｍの大きさの倉庫の土間に型枠が設けられると共に格子（格子寸法：開口部寸法：１８．７ｃｍ×１８．７ｃｍ）状に鉄筋が配筋される。尚、図１では、ネット状帯は示されていない。 First, as shown in FIG. 1, a formwork is provided in a predetermined place, for example, a 55 m × 23 m warehouse soil, and in a lattice (grid size: opening size: 18.7 cm × 18.7 cm) shape. Reinforcing bars are arranged. In FIG. 1, the net-like band is not shown.
次に、図２，３，４，５に白線でネット状帯が示される通り、ネット状帯が格子（格子寸法：開口部寸法：１２９．５ｃｍ×１２９．５ｃｍ、１２９．５ｃｍ×１４９．５ｃｍ、１４９．５ｃｍ×１２９．５ｃｍ、又は１４９．５ｃｍ×１４９．５ｃｍ）状に張られる。尚、この時、図４からも判る通り、長手方向に二つ折りにしたネット状帯（二つ折り後の幅は１０．５ｃｍ）の中央を５０ｃｍ間隔で鉄筋に対して取り付けられることで、ネット状帯は格子状に張られる。すなわち、縦方向において約１２９．５ｃｍ又は１４９．５ｃｍの間隔を置いて順にネット状帯が張られたものであり、又、横方向においても約１２９．５ｃｍ又は１４９．５ｃｍの間隔を置いて順にネット状帯が張られたものである。尚、縦方向および横方向とも、１２９．５ｃｍと１４９．５ｃｍの間隔は交互になるようにした。尚、言うまでも無いが、図からも判る通り、格子状に張ったネット状帯の格子寸法は、格子状に組み付けられた鉄筋の格子寸法よりも遥かに大きい。 Next, as shown by the white lines in FIGS. 2, 3, 4 and 5, the net-like bands are lattices (lattice dimensions: opening dimensions: 129.5 cm × 129.5 cm, 129.5 cm × 149.5 cm). 149.5 cm × 129.5 cm, or 149.5 cm × 149.5 cm). At this time, as can be seen from FIG. 4, the center of the net-shaped band folded in half in the longitudinal direction (the width after bi-folding is 10.5 cm) is attached to the reinforcing bar at intervals of 50 cm. The belt is stretched in a grid pattern. That is, a net-like band is stretched in order with an interval of about 129.5 cm or 149.5 cm in the vertical direction, and also in the horizontal direction in order with an interval of about 129.5 cm or 149.5 cm. A net-like belt is stretched. Note that the intervals of 129.5 cm and 149.5 cm were alternated in the vertical direction and the horizontal direction. Needless to say, as can be seen from the figure, the lattice size of the net-like band stretched in a lattice shape is much larger than the lattice size of the reinforcing bars assembled in the lattice shape.
さて、図２，３，４，５に白線で示される如くにネット状帯が格子状に張られた後、図６に示される如く、セメント組成物が型枠内に流し込まれる。そして、ネット状帯がセメント組成物中に埋設されることになる。この後、放置によってセメント組成物が硬化すると、本発明になるセメント硬化体が得られる。 Now, after the net-like bands are stretched in a lattice shape as shown by white lines in FIGS. 2, 3, 4 and 5, the cement composition is poured into the mold as shown in FIG. A net-like band is then embedded in the cement composition. Thereafter, when the cement composition is cured by being left standing, a cured cement according to the present invention is obtained.
さて、上記で用いたネット状帯は、長さが６０ｍ、幅が２１ｃｍ程度の帯を長手方向に二つ折りにしたものを用いた。尚、帯と言っても、図２，３，４，５等からも理解される通り、紐（或は糸、若しくは幅狭なテープ）を用いて網状に組合わせたものである。従って、このネット状帯自体も、格子状に編まれたものであると言っても差し支えが無いものである。すなわち、このネット状帯自体も、長手方向に約２ｃｍ強（約２．３ｃｍ）で短手方向に約2ｃｍ弱（約１．６ｃｍ）の大きさの開口を繰り返して有するものである。更に詳しく説明すると、縦方向（長手方向）には、例えば３本の固まった（３本が一組に纏まった）ガラス繊維（耐アルカリ性のガラス繊維）製の糸（糸幅：約３ｍｍ、糸厚：約０．７ｍｍ）が約１５〜１７ｍｍの間隔（短手方向において約１５〜１７ｍｍの間隔）を開けて設けられている。又、（ネット状帯における開口部の中の縦１０ｍｍ以上で横１０ｍｍ以上の大きさの開口部の全面積）／（ネット状帯の全面積）が０．４５である。尚、固まって設けられている３本の糸は、互いに、接していても良い。従って、糸幅が約３ｍｍの糸を３本用いる代わりに、糸幅が９ｍｍの糸を用いても良い。但し、本実施形態では、糸幅が約３ｍｍの糸を３本用いたことから、３本の糸が固まっているとは言うものの、現実的には、縦糸間に、僅かな隙間、例えば１ｍｍ程度の隙間が設けられている。そして、このような僅かと雖も隙間の有る方が、該隙間を介して両側のセメント組成物同士が一体化するので、ひび割れ抑制の観点から好ましいものであった。ところで、例えば左側から１，２，３番目の糸が固まって長手方向に設けられ、４番目の糸が３番目の糸とは約１５〜１７ｍｍの間隔を開けて縦方向に設けられ、そして４，５，６番目の糸が、また、同様に固まって長手方向に設けられ、又、７番目の糸が６番目の糸とは約１５〜１７ｍｍの間隔を開けて長手方向に設けられ、そして７，８，９番目の糸が、また、同様に固まって長手方向に設けられ、又、１０番目の糸が９番目の糸とは約１５〜１７ｍｍの間隔を開けて長手方向に設けられ、そして１０，１１，１２番目の糸が、また、同様に固まって長手方向に設けられ、又、１３番目の糸が１２番目の糸とは約１５〜１７ｍｍの間隔を開けて長手方向に設けられ、そして１３，１４，１５番目の糸が、また、同様に固まって長手方向に設けられ、又、１６番目の糸が１５番目の糸とは約１５〜１７ｍｍの間隔を開けて長手方向に設けられ、そして１６，１７，１８番目の糸が、また、同様に固まって長手方向に設けられ、又、１９番目の糸が１８番目の糸とは約１５〜１７ｍｍの間隔を開けて長手方向に設けられ、そして１９，２０，２１番目の糸が、また、同様に固まって長手方向に設けられたものである。短手方向には、ガラス繊維（耐アルカリ性のガラス繊維）製の糸（糸幅：約２．３ｍｍ、糸厚：約０．５ｍｍ、糸長：約２１０ｍｍ）１本が約２２〜２４ｍｍの間隔を開けて設けられている。尚、この短手方向の糸は、上記長手方向の糸（３本の糸）に対して、順に、裏・表となるように配されている。すなわち、左から１，２，３番目の縦糸の上（表面上）に横糸が配されているとすると、左から４，５，６番目の縦糸の下（裏面下）に横糸が配され、そして左から７，８，９番目の縦糸の上（表面上）に横糸が配され、次の１０，１１，１２番目の縦糸の下（裏面下）に横糸が配され、そして次の１３，１４，１５番目の縦糸の上（表面上）に横糸が配され、次の１６，１７，１８番目の縦糸の下（裏面下）に横糸が配され、そして次の１９，２０，２１番目の縦糸の上（表面上）に横糸が配されると言った形態である。又、上記の横糸に隣接する横糸は、左から１，２，３番目の縦糸の下（裏面下）に横糸が配され、左から４，５，６番目の縦糸の上（表面上）に横糸が配され、そして左から７，８，９番目の縦糸の下（裏面下）に横糸が配され、次の１０，１１，１２番目の縦糸の上（表面上）に横糸が配され、そして次の１３，１４，１５番目の縦糸の下（裏面下）に横糸が配され、次の１６，１７，１８番目の縦糸の上（表面上）に横糸が配され、そして次の１９，２０，２１番目の縦糸の下（裏面下）に横糸が配されると言った形態である。勿論、この上下関係は、３本の糸が一塊では無く、１本１本が順に交互と言った形態でも差し支え無い。又、縦糸や横糸は複数の繊維で出来ており、従って縦糸と横糸との交点においては、縦糸の間を横糸が抜けるようになっている。すなわち、縦糸の繊維間を横糸が抜けるように縦糸と横糸とは編まれている。そして、縦糸と横糸との交点には樹脂が含浸させられていて、縦糸と横糸とは交点でズレが起きないように互いに接着されている。 The net-like band used above was obtained by folding a band having a length of about 60 m and a width of about 21 cm in the longitudinal direction. Note that the band is a net-like combination using a string (or a thread or a narrow tape) as understood from FIGS. Therefore, it can be said that the net-like belt itself is knitted in a lattice shape. In other words, the net-like band itself has an opening having a size of about 2 cm (about 2.3 cm) in the longitudinal direction and about 2 cm (about 1.6 cm) in the short direction. More specifically, in the longitudinal direction (longitudinal direction), for example, three solid (three bundles) glass fiber (alkali-resistant glass fiber) yarn (yarn width: about 3 mm, yarn) (Thickness: about 0.7 mm) is provided with an interval of about 15-17 mm (interval of about 15-17 mm in the short direction). Further, (the total area of the opening having a size of 10 mm or more in the opening in the net-like band and a size of 10 mm or more) / (the total area of the net-like band) is 0.45. In addition, the three yarns provided in a solid state may be in contact with each other. Therefore, instead of using three yarns having a yarn width of about 3 mm, a yarn having a yarn width of 9 mm may be used. However, in the present embodiment, since three yarns having a yarn width of about 3 mm are used, the three yarns are solidified, but in reality, a slight gap between the warp yarns, for example, 1 mm, for example. A gap of a degree is provided. And it is preferable from the viewpoint of cracking suppression that such a slight gap and a gap between the cement compositions on both sides are integrated through the gap. By the way, for example, the first, second, and third yarns from the left side are solidified and provided in the longitudinal direction, and the fourth yarn is provided in the longitudinal direction with an interval of about 15 to 17 mm from the third yarn. 5th and 6th yarns are similarly set in the longitudinal direction, and the 7th yarn is provided in the longitudinal direction with a spacing of about 15 to 17 mm from the 6th yarn, and The seventh, eighth, and ninth yarns are similarly set in the longitudinal direction, and the tenth yarn is provided in the longitudinal direction with an interval of about 15 to 17 mm from the ninth yarn. The tenth, eleventh, and twelfth yarns are similarly set in the longitudinal direction, and the thirteenth yarn is provided in the longitudinal direction with an interval of about 15 to 17 mm from the twelfth yarn. , And the 13th, 14th and 15th yarns are also solidified in the longitudinal direction The 16th yarn is provided in the longitudinal direction with a spacing of about 15-17 mm from the 15th yarn, and the 16th, 17th and 18th yarns are also set in the longitudinal direction And the 19th yarn is provided in the longitudinal direction with an interval of about 15 to 17 mm from the 18th yarn, and the 19th, 20th and 21st yarns are also solidified in the longitudinal direction. It is provided in the direction. In the short direction, one glass fiber (alkali-resistant glass fiber) yarn (yarn width: about 2.3 mm, yarn thickness: about 0.5 mm, yarn length: about 210 mm) is about 22-24 mm apart. Is provided. The short-side yarns are arranged so that the front and back sides are in order with respect to the above-mentioned longitudinal yarns (three yarns). That is, if weft is arranged on the first, second and third warps from the left (on the surface), the weft is arranged under the fourth, fifth and sixth warps from the left (under the back), Then, the weft is arranged on the seventh, eighth and ninth warps from the left (on the surface), the weft is arranged under the tenth, eleventh and twelfth warps (below the back), and the next 13, The weft yarn is arranged above the 14th and 15th warp yarns (on the surface), the weft yarn is arranged below the 16th, 17th and 18th warp yarns (under the back surface), and the next 19, 20, 21st warp yarns This is a form in which wefts are arranged on the warp (on the surface). The weft adjacent to the above-mentioned weft is arranged below the first, second and third warps from the left (under the back), and above the fourth, fifth and sixth warps (from the top) from the left. The weft is arranged, and the weft is arranged under the seventh, eighth and ninth warps from the left (below the back surface), and the weft is arranged on the next tenth, eleventh and twelfth warps (on the surface), And the weft yarn is arranged under the next 13, 14, 15th warp yarn (under the back surface), the weft yarn is arranged on the next 16, 17, 18th warp yarn (on the surface), and the next 19, This is a form in which wefts are arranged under the 20th and 21st warp yarns (under the back surface). Of course, this vertical relationship may be such that the three yarns are not one lump but one by one alternately. The warp and weft are made of a plurality of fibers. Therefore, at the intersection of the warp and the weft, the weft can be removed between the warps. That is, the warp and the weft are knitted so that the weft can be removed between the fibers of the warp. The intersection of the warp and the weft is impregnated with resin, and the warp and the weft are bonded to each other so that no deviation occurs at the intersection.
さて、上記実施形態では、ネット状帯の幅の２〜４０倍の寸法を開けてネット状帯を格子状に配設したものである。すなわち、全面にネット状帯を敷設したものでは無い。従って、ネット状帯の使用量が少なくて済む。すなわち、経済的である。かつ、ネット状帯の使用量が少ないと言うことは、それだけ、敷設作業性にも優れることである。従って、この面からも経済的である。 By the way, in the said embodiment, the size of 2-40 times the width | variety of a net-like belt | band | zone is opened, and a net-like belt | band | zone is arrange | positioned in the grid | lattice form. That is, it is not a net-like belt laid on the entire surface. Therefore, the amount of net strips used can be reduced. That is, it is economical. In addition, the fact that the amount of net strips used is small means that the laying workability is excellent. Therefore, it is economical also from this aspect.
又、ネット状帯が全面に亘って敷設されたものでは無いから、セメント組成物を型枠の上から流し込んでも、ネット状帯が殆ど邪魔にならない。仮に、ネット状帯の上に流されたセメント組成物がネット状帯によって遮られても、ネット状帯の左右からネット状帯の下側にセメント組成物は流れ込む。従って、ジャンカ等の打設不良が引き起こされることも無い。 In addition, since the net-like band is not laid over the entire surface, even if the cement composition is poured from above the mold, the net-like band hardly disturbs. Even if the cement composition flowed on the net-like band is blocked by the net-like band, the cement composition flows from the left and right sides of the net-like band to the lower side of the net-like band. Therefore, no placement failure such as a jumper is caused.
又、ネット状帯が全面的に敷設されていなくとも、ひび割れは効果的に抑制されていた。 Moreover, even if the net-like band was not laid all over, the crack was effectively suppressed.
Claims (5)
ことを特徴とするセメント硬化体。 A hardened cement body in which net-like bands are arranged in a lattice pattern.
ことを特徴とするセメント硬化体。 A hardened cement body, wherein a net-like band is attached to a reinforcing bar in the hardened cement body, and the net-like band is arranged in a lattice shape.
ことを特徴とする請求項１又は請求項２のセメント硬化体。 The hardened cement body according to claim 1 or 2, wherein the net-like bands are arranged in a lattice pattern with an interval of 2 to 40 times the width of the net-like band.
前記ネット状帯が格子状に配設された箇所にセメント組成物を供給するセメント組成物供給工程
とを具備することを特徴とするセメント硬化体の製造方法。 A net-like band arranging step of arranging a net-like band in a lattice shape;
And a cement composition supplying step of supplying a cement composition to a place where the net-like belts are arranged in a lattice pattern.
を具備することを特徴とするセメント硬化体の製造方法。
A method for producing a hardened cement body, comprising an embedding step of embedding a net-like band in a lattice shape in an uncured cement composition.
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| JP2001226849A (en) * | 2000-02-09 | 2001-08-21 | Toray Ind Inc | Reinforcing woven fabric |
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| JP2005120547A (en) * | 2003-10-20 | 2005-05-12 | Ube Nitto Kasei Co Ltd | Reinforcing material made from fiber-reinforced thermoplastic resin and method for producing the same |
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| JPH01102161A (en) * | 1987-10-14 | 1989-04-19 | Nippon Oil Co Ltd | Structure material for reinforcement |
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| JP2001020147A (en) * | 1999-07-01 | 2001-01-23 | Nippon Mitsubishi Oil Corp | Mesh woven fabric for reinforcement and method for reinforcing material |
| JP2001226849A (en) * | 2000-02-09 | 2001-08-21 | Toray Ind Inc | Reinforcing woven fabric |
| JP2002194855A (en) * | 2000-12-22 | 2002-07-10 | Nippon Mitsubishi Oil Corp | Grating-like material, method of manufacturing grating- like material and method of reinforcement |
| JP2003105876A (en) * | 2001-09-28 | 2003-04-09 | Shimizu Corp | Structural body of waterproof concrete |
| JP2005120547A (en) * | 2003-10-20 | 2005-05-12 | Ube Nitto Kasei Co Ltd | Reinforcing material made from fiber-reinforced thermoplastic resin and method for producing the same |
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| JP4958173B2 (en) | 2012-06-20 |
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