JPH07268995A - Permanent buried form for highly durable concrete, and its manufacture - Google Patents
Permanent buried form for highly durable concrete, and its manufactureInfo
- Publication number
- JPH07268995A JPH07268995A JP8528694A JP8528694A JPH07268995A JP H07268995 A JPH07268995 A JP H07268995A JP 8528694 A JP8528694 A JP 8528694A JP 8528694 A JP8528694 A JP 8528694A JP H07268995 A JPH07268995 A JP H07268995A
- Authority
- JP
- Japan
- Prior art keywords
- formwork
- concrete
- weight
- permanent
- cement
- 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.)
- Withdrawn
Links
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、コンクリート用永久埋
設型枠及びその製造方法に関するものであり、更に詳し
くは成形性に優れると共に、高耐久性、即ち耐候性に優
れ、しかも高強度を有するコンクリート用永久埋設型枠
及びその製造方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a permanent buried formwork for concrete and a method for producing the same, more specifically, it has excellent moldability, high durability, that is, excellent weather resistance and high strength. The present invention relates to a permanent buried formwork for concrete and a method for manufacturing the same.
【０００２】[0002]
【従来の技術】従来、一般に建築物等の型枠工法に用い
られる型枠材は、脱型して再利用することを前提として
使用されており、このような型枠構造としては、通常コ
ンパネと呼ばれる合板や鋼製材が使用されている。この
他近年、各種の材質で形成した型枠が使用乃至試みられ
ている。例えば薄いコンクリート板、ガラス繊維強化セ
メント板等の型枠、軽量化と美観を追求したＦＲＰ（繊
維強化プラスチック）製、リサイクルを目的としたもの
で硬質紙製捨て型枠や、近年新しい型枠として不織布と
木製型枠併用した透水性型枠等がある。2. Description of the Related Art Conventionally, formwork materials generally used in the formwork construction method for buildings and the like have been used on the premise that they are demolded and reused. Plywood and steel lumber called is used. In recent years, molds made of various materials have been used or tried. For example, thin concrete boards, glass fiber reinforced cement boards, and other forms, FRP (fiber reinforced plastic) products that are lightweight and aesthetically pleasing, and for the purpose of recycling, waste paper forms such as hard paper and recently new forms. There is a water-permeable formwork that uses both non-woven fabric and wooden formwork.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、前述の
如き型枠は、材質の違いによる固有の欠点を有してお
り、木製型枠や樹脂製型枠等では永久型枠として使用す
るためには耐火性に劣るという問題があり、また不織布
と木製型枠併用した透水性型枠や硬質紙製捨て型枠で
は、透水性を有する点で好ましいが、半永久的に使用し
得る耐久性というと問題があり、更に鋼製材、樹脂製及
びＦＲＰ製では吸水性、透水性等の性能がなく、したが
って打設するコンクリートを改質する作用がないので、
良好なコンクリート製構造物を得ることができないとい
う問題がある。一方、木製型枠の使用は、近年環境破壊
の問題、木材資源の削減や打設工法の短縮等の要望によ
り、これに代る型枠建材、特に埋設型の型枠が求められ
るようになった。However, the formwork as described above has an inherent drawback due to the difference in material, and it is not suitable for use as a permanent formwork in a wooden formwork or a resin formwork, etc. There is a problem that it is inferior in fire resistance, and a water-permeable mold that uses a non-woven fabric and a wooden mold together or a discard mold made of hard paper is preferable in that it has water permeability, but there is a problem with durability that can be used semipermanently. In addition, steel products, resin products, and FRP products do not have properties such as water absorption and water permeability, and therefore have no action to modify the concrete to be placed.
There is a problem that a good concrete structure cannot be obtained. On the other hand, the use of wooden formwork has recently led to a demand for alternative formwork building materials, especially buried formwork, due to the problems of environmental damage, requests for reducing wood resources and shortening the construction method. It was
【０００４】そこで、本発明者は、このような問題点に
ついて、検討した結果、セメントを成分とする型枠材と
しての条件は、打設したコンクリートの余剰水を吸収
して、内部コンクリートの水セメント比を小さくするこ
とが必要であり、このような吸収作用を持たせるには型
枠素材として１０％〜２５％の気孔率とする必要があ
る。型枠のメンテナンスフリー（保持、管理を必要と
しない）とするためには、耐候性に優れていることが必
須条件で、かつ型枠素材の曲げ強度が８ＭＰａ〜４５Ｍ
Ｐａという強度を必要とする。コンクリート打設時に
型枠が破壊される恐れがあるという３点である。Therefore, as a result of studying such a problem, the present inventor found that the condition of the formwork material containing cement is that the excess water of the placed concrete is absorbed and the water of the internal concrete is absorbed. It is necessary to reduce the cement ratio, and in order to have such an absorbing effect, it is necessary to make the porosity of the mold material 10% to 25%. In order to make the formwork maintenance-free (no need to hold or manage), excellent weather resistance is a prerequisite, and the bending strength of the formwork material is 8 MPa to 45 M.
It requires a strength of Pa. There are three points that the formwork may be destroyed during concrete pouring.
【０００５】したがって、この３点を満足する型枠素材
について、更に究明したところ、セメントに可塑剤を添
加した後、水で混練し、成形すると、成形性が良好とな
り、更に成形時に鉄筋を入れて成形すると共に蒸気養生
あるいは高温・高圧養生することにより得られた鉄筋入
り型枠が施工時埋設型枠として優れた性能を有するもの
であることを見出し、ここに本発明をするに至った。よ
って本発明が解決しようとする課題は、埋設型枠に鉄筋
を入れて１０％〜２５％の気孔率と８ＭＰａ以上の曲げ
強度を有し、コンクリート打設時に破壊される恐れがな
い高耐久性、即ち耐候性に優れ、しかも高強度を有する
コンクリート用永久埋設型枠を提供することにある。ま
た本発明が解決しようとする課題は、１０％〜２５％の
気孔率と８ＭＰａ以上の曲げ強度を有する埋設型枠を良
好な成形性のもとに製造することができ、高耐久性、即
ち耐候性に優れ、しかも高強度を有するコンクリート用
永久埋設型枠の製造方法を提供することにある。Therefore, when the mold material satisfying these three points was further clarified, it was found that when a plasticizer was added to cement, and then the mixture was kneaded with water and molded, the moldability was good, and further, a reinforcing bar was added during molding. The present invention has been found out that a rebar-reinforced mold obtained by steam-curing or high-temperature / high-pressure curing as well as molding has excellent performance as a buried mold at the time of construction. Therefore, the problem to be solved by the present invention is to put reinforcing bars in an embedded formwork, have a porosity of 10% to 25% and a bending strength of 8 MPa or more, and have high durability without fear of being broken during concrete pouring. That is, it is to provide a permanent buried formwork for concrete which has excellent weather resistance and high strength. Further, the problem to be solved by the present invention is that a buried form having a porosity of 10% to 25% and a bending strength of 8 MPa or more can be manufactured with good moldability, and high durability, that is, An object of the present invention is to provide a method of manufacturing a permanent buried formwork for concrete which has excellent weather resistance and high strength.
【０００６】[0006]
【課題を解決するための手段】本発明が解決しようとす
る課題は、以下の各発明によって達成される。 （１）１０％〜２５％の気孔率と８ＭＰａ以上の曲げ強
度を有するコンクリート用永久埋設型枠であって、型枠
素材がセメント、繊維、シリカ、砂、粘土、可塑剤及び
水からなり、かつ前記埋設型枠は鉄筋を有することを特
徴とするコンクリート用永久埋設型枠。 （２）曲げ強度が８ＭＰａ〜４５ＭＰａであることを特
徴とする前記第１項に記載のコンクリート用永久埋設型
枠。 （３）セメント２５重量％〜５５重量％、繊維１重量％
〜１０重量％、砂５重量％〜３０重量％、シリカ１０重
量％〜４０重量％、粘土５重量％〜３０重量％及び可塑
剤０．１重量％〜３重量％からなることを特徴とする前
記第１項又は第２項のいづれかに記載のコンクリート用
永久埋設型枠。 （４）繊維が無機系天然繊維、有機系天然繊維又は合成
繊維から選ばれた少なくとも１種以上であることを特徴
とする前記第１項又は第３項のいづれかに記載のコンク
リート用永久埋設型枠。 （５）型枠裏面が凹凸状に形成されていることを特徴と
する前記第１項又は第４項のいづれかに記載のコンクリ
ート用永久埋設型枠。 （６）前記第１項又は第５項のいづれかに記載のコンク
リート用永久埋設型枠と打設コンクリートからなるコン
クリート構造物。 （７）１０％〜２５％の気孔率と８ＭＰａ以上の曲げ強
度を有するコンクリート用永久埋設型枠の製造方法にお
いて、セメント、繊維、シリカ、砂、粘土、可塑剤及び
水の配合物を混練し、得られた混練物を成形用型枠に導
入して成形し、ついで得られた成形物を蒸気養生するこ
とを特徴とするコンクリート用永久埋設型枠の製造方
法。 （８）成形手段として、成形用型枠を用いることを特徴
とする前記第７項に記載のコンクリート用永久埋設型枠
の製造方法。 （９）成形手段として、押出し成形を用いることを特徴
とする前記第７項に記載のコンクリート用永久埋設型枠
の製造方法。 （１０）配合物がセメント２５重量％〜５５重量％、繊
維１重量％〜１０重量％、砂５重量％〜３０重量％、シ
リカ１０重量％〜４０重量％、粘土５重量％〜３０重量
％及び可塑剤０．１重量％〜３重量％からなることを特
徴とする前記第７項乃至第９項のいずれかに記載のコン
クリート用永久埋設型枠の製造方法。 （１１）繊維が無機系天然繊維、有機系天然繊維又は合
成繊維から選ばれた少なくとも１種以上であることを特
徴とする前記第７項乃至第１０項のいづれかに記載のコ
ンクリート用永久埋設型枠の製造方法。 （１２）養生として、蒸気養生に代えて高温・高圧養生
することを特徴とする前記第７項乃至第１１項のいづれ
かに記載のコンクリート用永久埋設型枠の製造方法。 （１３）養生として、蒸気養生に代えて気中養生するこ
とを特徴とする前記第７項乃至第１１項のいづれかに記
載のコンクリート用永久埋設型枠の製造方法。The problems to be solved by the present invention are achieved by the following inventions. (1) A permanent buried formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, the formwork material being cement, fiber, silica, sand, clay, a plasticizer and water, A permanent buried formwork for concrete, characterized in that the buried formwork has reinforcing bars. (2) The permanent buried formwork for concrete according to the above-mentioned item 1, which has a bending strength of 8 MPa to 45 MPa. (3) Cement 25% to 55% by weight, fiber 1% by weight
10 wt%, 5 wt% to 30 wt% sand, 10 wt% to 40 wt% silica, 5 wt% to 30 wt% clay, and 0.1 wt% to 3 wt% plasticizer. The permanent buried formwork for concrete according to any one of the above items 1 and 2. (4) The permanent burying mold for concrete according to any one of the above items 1 or 3, wherein the fibers are at least one kind selected from inorganic natural fibers, organic natural fibers and synthetic fibers. frame. (5) The permanent buried formwork for concrete according to any one of the above items 1 or 4, wherein the back surface of the formwork is formed in an uneven shape. (6) A concrete structure comprising the permanent buried formwork for concrete according to any one of the above items 1 and 5 and cast concrete. (7) In a method for producing a permanent buried formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, a mixture of cement, fiber, silica, sand, clay, a plasticizer and water is kneaded. A method for producing a permanent buried formwork for concrete, which comprises introducing the obtained kneaded product into a forming formwork and molding the product, and then subjecting the obtained formed product to steam curing. (8) The method for manufacturing a permanent buried formwork for concrete according to the item 7, wherein a formwork is used as the forming means. (9) The method for producing a permanent buried formwork for concrete according to the item 7, wherein extrusion molding is used as the molding means. (10) Cement 25% to 55% by weight, fiber 1% to 10% by weight, sand 5% to 30% by weight, silica 10% to 40% by weight, clay 5% to 30% by weight. And 0.1% to 3% by weight of a plasticizer, The method for manufacturing a permanent buried formwork for concrete according to any one of the above items 7 to 9. (11) The permanent burying mold for concrete according to any one of items 7 to 10, wherein the fiber is at least one selected from inorganic natural fibers, organic natural fibers and synthetic fibers. Frame manufacturing method. (12) The method for producing a permanent buried formwork for concrete according to any of the above items 7 to 11, characterized in that the curing is performed at high temperature and high pressure instead of steam curing. (13) The method for producing a permanent buried formwork for concrete according to any one of the above items 7 to 11, wherein the curing is performed in air instead of steam curing.
【０００７】以下、本発明について、更に詳しく説明す
ると、本発明のコンクリート用永久埋設型枠は、１０％
〜２５％の気孔率と８ＭＰａ以上の曲げ強度を有するコ
ンクリート用永久埋設型枠を構成するもので、該コンク
リート用永久埋設型枠は、型枠素材がセメント、繊維、
シリカ、砂、粘土及び可塑剤からなり、この混合物に水
を加えて混練し、得られた混練物を鉄筋を配置した成形
用型枠に導入して成形するか又は鉄筋と共に押出し成形
することにより、良好な成形性のもとに成形物が製造さ
れる。ついで得られた成形物を蒸気養生、特に好ましく
は高温・高圧養生することによって、１０％〜２５％の
気孔率と８ＭＰａ以上の曲げ強度を有する高耐久性に優
れた埋設型枠が得られ、該埋設型枠は施工時に破壊され
る恐れがなく、また施工後は、コンクリートと一体化さ
れることにより、更にいっそう耐候性及び曲げ強度の優
れたコンクリート構造物が得られる。The present invention will be described in more detail below. The permanent buried formwork for concrete of the present invention is 10%.
A permanent embedding formwork for concrete having a porosity of -25% and a bending strength of 8 MPa or more is used.
Consisting of silica, sand, clay and a plasticizer, water is added to this mixture and kneaded, and the resulting kneaded product is introduced into a molding frame in which a reinforcing bar is arranged and molded, or by extrusion molding together with the reinforcing bar. A molded product is manufactured with good moldability. Then, by subjecting the obtained molded product to steam curing, particularly preferably high temperature / high pressure curing, an embedded mold excellent in high durability having a porosity of 10% to 25% and a bending strength of 8 MPa or more is obtained, There is no risk of the buried formwork being destroyed during construction, and by being integrated with concrete after construction, a concrete structure with even better weather resistance and bending strength can be obtained.
【０００８】本発明のコンクリート用永久埋設型枠の製
造方法により、良好な成形性が得られると共に成形時に
鉄筋を入れて埋設型枠を製造することにより得られた鉄
筋入り埋設型枠は、優れた耐久性を有するが、この耐久
性は、曲げ強度と、中性化防止、塩分浸透防止、更には
凍害防止等や紫外線、風雨、更には酸性雨等の耐候性の
２種類の効果をいうものである。本発明のコンクリート
用永久埋設型枠を構成する素材としては、セメント、繊
維、シリカ、砂及び粘土であり、これらの混練物に充填
性と成形性を良くするために可塑剤を添加する。このセ
メントとしては、普通ポルトランドセメントを始め、早
強ポルトランドセメント、超早強ポルトランドセメント
などのポルトランドセメント、高炉セメント、シリカセ
メント、フライアッシュセメント等の混合セメント、ア
ルミナセメント等の任意のものが用いられる。According to the method for producing a permanent buried formwork for concrete of the present invention, good formability is obtained, and an embedded formwork with a reinforcing bar obtained by producing a buried formwork by inserting a reinforcing bar during molding is excellent. It has two types of effects: flexural strength, neutralization prevention, salt penetration prevention, frost damage prevention, and weather resistance such as ultraviolet rays, wind and rain, and acid rain. It is a thing. Cement, fiber, silica, sand and clay are used as materials for the permanent buried formwork for concrete of the present invention, and a plasticizer is added to these kneaded products in order to improve the filling property and moldability. As this cement, any one of ordinary Portland cement, Portland cement such as early strength Portland cement and super early strength Portland cement, mixed cement such as blast furnace cement, silica cement, fly ash cement, and alumina cement can be used. .
【０００９】また繊維としては、ワラストナイト、石綿
等の無機繊維、パルプ等の天然有機繊維又は合成繊維等
が挙げられ、更に具体的には天然有機繊維として、ＮＢ
Ｋパルプ、ＬＢＫパルプ、木綿パルプ、麻パルプ等のパ
ルプ、木粉、鋸屑、コルク粉、各種繊維等が挙げられ、
合成繊維としては、塩化ビニル、ナイロン、ポリアミ
ド、ポリエステル、ポリウレタン、ビニロン、ポリエチ
レン、アラミド繊維、炭素繊維等が挙げられる。これら
の繊維は、任意の長さで用いてもよいが、好ましくは１
ｍｍ〜２０ｍｍの長さのものがよく、更には２ｍｍ〜１
０ｍｍの長さのものがよい。また繊維の直径は、０．０
０１ｍｍ〜２ｍｍが好ましい。Examples of the fibers include inorganic fibers such as wollastonite and asbestos, natural organic fibers such as pulp and synthetic fibers, and more specifically, the natural organic fibers include NB.
K pulp, LBK pulp, cotton pulp, hemp pulp and other pulp, wood powder, sawdust, cork powder, various fibers, and the like,
Examples of synthetic fibers include vinyl chloride, nylon, polyamide, polyester, polyurethane, vinylon, polyethylene, aramid fiber, and carbon fiber. These fibers may be used in any length, but preferably 1
mm to 20 mm long is preferable, and further 2 mm to 1
A length of 0 mm is preferable. The fiber diameter is 0.0
01 mm to 2 mm is preferable.
【００１０】本発明に用いられるシリカは、いかなる種
類のもの、又はいかなる製造方法によって得られたもの
でもよく、無定形シリカ、シリカフューム、アモルファ
スシリカ（非晶質シリカ）、フライアッシュ等が挙げら
れる。これらのシリカの平均粒径は、０．１μｍ〜１０
０μｍである。本発明では、セメント成分にこれらのシ
リカを添加することにより曲げ強度を向上させることが
できる。また本発明に用いられる砂としては、川砂、海
砂、砂石等が挙げられる。更に本発明に用いられる粘土
は、埋設型枠の製造に際し、成形性を良好にすると共に
養生した後の製品の表面の仕上りが良くなる効果があ
る。このような粘土としては、頁岩粘土、木節粘土、蛙
目粘土、カオリン等が挙げられる。The silica used in the present invention may be of any type or obtained by any production method, and examples thereof include amorphous silica, silica fume, amorphous silica (amorphous silica) and fly ash. The average particle size of these silicas is 0.1 μm to 10 μm.
It is 0 μm. In the present invention, bending strength can be improved by adding these silicas to the cement component. Examples of the sand used in the present invention include river sand, sea sand and sand stone. Furthermore, the clay used in the present invention has the effects of improving moldability and improving the surface finish of the product after curing during the production of an embedded formwork. Examples of such clay include shale clay, kibushi clay, frog eye clay, kaolin and the like.
【００１１】また本発明に用いられるセメント、繊維、
シリカ、砂及び粘土の比率は、セメント２５重量％〜５
５重量％、繊維１重量％〜１０重量％、砂５重量％〜３
０重量％、シリカ１０重量％〜４０重量％、粘土５重量
％〜３０重量％からなり、好ましくはセメント３０重量
％〜５０重量％、繊維１重量％〜５重量％，シリカ１５
重量％〜３０重量％，砂１０重量％〜２５重量％及び粘
土１０重量％〜２０重量％からなる。セメントが２５重
量％未満では強度が低くなるので好ましくなく、セメン
トが５５重量％を越えても強度の増加はなく経済的に不
利である。また繊維が繊維１重量％未満では補強効果が
余りなく、１０重量％を越えるとかえって強度が低下す
る。本発明に用いられるシリカの量が１０重量％未満で
は、曲げ強度をより大きくすることができず、シリカが
４０重量％を越えるとかえって曲げ強度が弱くなる傾向
にあるので好ましくない。また粘土の添加量が５重量％
未満では成形性ないし表面性が十分でなく、粘土の添加
量が２０重量％を越えると得られた型枠の強度が不十分
となり好ましくない。Further, the cement, the fiber, which is used in the present invention,
The ratio of silica, sand and clay is 25% by weight of cement to 5%.
5% by weight, 1% by weight to 10% by weight of fiber, 5% by weight to 3% of sand
0 wt%, 10 wt% to 40 wt% silica, 5 wt% to 30 wt% clay, preferably 30 wt% to 50 wt% cement, 1 wt% to 5 wt% fiber, 15 silica
% To 30% by weight, 10% to 25% by weight sand, and 10% to 20% by weight clay. If the amount of cement is less than 25% by weight, the strength is lowered, which is not preferable, and if the amount of cement exceeds 55% by weight, the strength is not increased and it is economically disadvantageous. If the fiber content is less than 1% by weight, the reinforcing effect is not so great, and if it exceeds 10% by weight, the strength is rather lowered. If the amount of silica used in the present invention is less than 10% by weight, the bending strength cannot be further increased, and if the amount of silica exceeds 40% by weight, the bending strength tends to be rather weak, which is not preferable. The amount of clay added is 5% by weight
If it is less than the above range, the moldability or surface property is not sufficient, and if the amount of clay added exceeds 20% by weight, the strength of the obtained mold is insufficient, which is not preferable.
【００１２】本発明に用いられる砂の添加割合が、５重
量％未満の場合は、本質的に低コストが図れない。また
砂の添加量が、３０重量％を越えるときは、曲げ強度又
はコンクリート構造物の強度が弱くなり好ましくない。
本発明に用いられるセメント、繊維、シリカ、砂及び粘
土の混練物を形成する際に用いられる水の量は、該混練
物１００重量部に対して水２０重量部〜５５重量部が好
ましく、また得られた埋設型枠の水セメント比は、通常
の水セメント比でよいが、好ましくは水セメント比で１
５％〜５０％である。更に本発明においては、該混練物
の形成に際し、可塑剤を添加するが、この可塑剤は、セ
メント、繊維、シリカ、砂及び粘土からなる混練物の混
練中に添加しても、または予めこの混練物に可塑剤を添
加した後、混練してもよい。本発明に用いられるのに好
ましい可塑剤としては、メチルセルロース、エチルセル
ロース、ヒドロキシメチルセルロース、ポリエチレンオ
キサイド（ＰＥＯ）等があり、これらの可塑剤の添加量
は、いづれの場合でも混練物に対して０．１重量％〜３
重量％であり、該可塑剤の添加量が０．１重量％未満で
は、十分良好な成形性を得ることができない。またこの
添加量が３重量％を越えるときは、可塑化が進行しすぎ
て成形することができない。[0012] When the addition ratio of sand used in the present invention is less than 5% by weight, the cost cannot be essentially reduced. If the amount of sand added exceeds 30% by weight, the bending strength or the strength of the concrete structure becomes weak, which is not preferable.
The amount of water used in forming the kneaded product of the cement, fiber, silica, sand and clay used in the present invention is preferably 20 parts by weight to 55 parts by weight of water with respect to 100 parts by weight of the kneaded product, and The water-cement ratio of the obtained buried formwork may be a normal water-cement ratio, but is preferably 1 in water-cement ratio.
It is 5% to 50%. Further, in the present invention, a plasticizer is added during the formation of the kneaded product, which may be added during the kneading of the kneaded product of cement, fiber, silica, sand and clay, or in advance. After adding a plasticizer to the kneaded product, kneading may be performed. Preferred plasticizers for use in the present invention include methyl cellulose, ethyl cellulose, hydroxymethyl cellulose, polyethylene oxide (PEO), etc., and the amount of these plasticizers added is 0.1 to the kneaded product in any case. Wt% -3
%, And if the amount of the plasticizer added is less than 0.1% by weight, sufficiently good moldability cannot be obtained. On the other hand, if the amount added exceeds 3% by weight, plasticization will proceed too much and molding will not be possible.
【００１３】本発明のコンクリート用永久埋設型枠は、
セメント、繊維、シリカ、砂及び粘土からなる配合物に
可塑剤を添加し、更に水を加えて該配合物を混練し、得
られた混練物を鉄筋を配置した成形用型枠に導入して成
形するか又は鉄筋と共に押出し成形し、ついで得られた
成形物を蒸気養生、特に好ましくは高温・高圧養生する
ことにより製造される。このセメント、繊維、シリカ、
砂、粘土、可塑剤及び水の混練物は、十分混練して得ら
れるが、この混練時間は、比較的短時間でよく、２分〜
１５分で十分均一な混練物が得られる。更に本発明に用
いられるセメント、繊維、シリカ、砂及び粘土の混練物
を形成する際に用いられる水の量は、該混練物１００重
量部に対して水１５重量部〜５５重量部が好ましく、ま
た得られた埋設型枠の水セメント比は、通常の水セメン
ト比でよいが、好ましくは水セメント比で２０％〜５０
％である。The permanent buried formwork for concrete of the present invention comprises
A plasticizer is added to a mixture of cement, fibers, silica, sand and clay, and the mixture is kneaded by further adding water, and the obtained kneaded product is introduced into a molding frame in which a reinforcing bar is arranged. It is produced by molding or extruding with a reinforcing bar, and then subjecting the obtained molded product to steam curing, particularly preferably high temperature and high pressure curing. This cement, fiber, silica,
A kneaded product of sand, clay, a plasticizer and water can be obtained by sufficiently kneading, but the kneading time may be a relatively short time, 2 minutes to
A sufficiently uniform kneaded product is obtained in 15 minutes. Further, the amount of water used in forming a kneaded product of cement, fiber, silica, sand and clay used in the present invention is preferably 15 parts by weight to 55 parts by weight of water with respect to 100 parts by weight of the kneaded product, The water-cement ratio of the obtained buried form may be a normal water-cement ratio, but is preferably 20% to 50% in water-cement ratio.
%.
【００１４】本発明のコンクリート用永久埋設型枠の製
造方法において、前記の如く混練した混練物を鉄筋を配
置した成形用型枠に導入して成形する。この鉄筋は、通
常鉄製が用いられる。しかしこれに限らず使用できる
が、経済性を考慮すると、鉄製が好ましい。この鉄筋は
直径０．８ｍｍ〜１９ｍｍのものが好ましく、この範囲
は通常この技術分野において用いられる範囲のものであ
り、したがってこの範囲に限定されるべきものでもな
い。また前記の成形用型枠による成形は、この技術分野
で通常用いられる成形方法でよく、コンクリートを型枠
に詰めた後、機械的な振動を与えて締固めを行って成形
するが、型枠にコンクリートを投入しながら同時に振動
締固めを行うものでもよい。この締固め成形の種類に
は、振動締固め、加圧振動締固め、その他があり、棒形
振動機、型枠振動機、振動台を振動させたものなどが用
いられる。更に成形方法を具体的に挙げると、所望の
成形用型枠に鉄筋を適宜の数配置した後、該型枠に混練
物を入れ、ついで該型枠をテーブルバイブレーターに固
定して成形する方法、型枠に鉄筋を適宜の数配置した
後、混練物を入れ、棒状バイブレーターを挿入して成形
する方法、所望の成形用型枠をテーブルバイブレータ
ーに固定し、該型枠に鉄筋を適宜の数配置した後、混練
物を入れ、棒状バイブレーターを挿入して成形する方法
などがある。これらの方法で脱型して製品を製造するま
での時間は、８時間〜４８時間をみれば十分である。つ
いで、成形された埋設型枠は、脱型する前に、養生室に
入れて、蒸気養生される。この蒸気養生は、高温の蒸気
を養生室へ送って大気圧下で、温度４０℃〜８５℃、養
生時間は２時間〜３６時間で行われる。この際昇温速度
は１２℃／ｈ〜３３℃／ｈで、最高温度６０℃〜７５℃
が好ましい。また蒸気養生するまでの前置時間は１時間
〜１２時間が望ましい。更にこの養生は必要に応じて繰
り返すことができる。In the method of manufacturing a permanent buried mold for concrete according to the present invention, the kneaded product kneaded as described above is introduced into a mold for arranging reinforcing bars and molded. This rebar is usually made of iron. However, although not limited to this, iron is preferable in view of economy. The rebar preferably has a diameter of 0.8 mm to 19 mm, and this range is a range usually used in this technical field, and therefore should not be limited to this range. The molding by the molding frame may be a molding method usually used in this technical field. After the concrete is packed into the frame, mechanical vibration is applied to compact it, and the molding is performed. It is also possible to perform vibration compaction while simultaneously pouring concrete into. The types of the compaction molding include vibration compaction, pressure vibration compaction, and others, and a rod-shaped vibrating machine, a form vibrating machine, a vibrating vibrating table, and the like are used. More specifically, a molding method, after arranging an appropriate number of reinforcing bars in a desired molding frame, putting a kneaded product in the frame, and then fixing the frame to a table vibrator to mold it, After arranging an appropriate number of reinforcing bars in the mold, a method of inserting the kneaded product and inserting a rod-shaped vibrator to fix the desired molding mold on the table vibrator, and arranging an appropriate number of reinforcing bars in the mold. After that, the kneaded product may be added, and a rod-shaped vibrator may be inserted for molding. It suffices that the time required for demolding by these methods to manufacture a product is 8 hours to 48 hours. Next, the molded embedded formwork is put into a curing room and steam-cured before being demolded. This steam curing is performed by sending high temperature steam to a curing chamber under atmospheric pressure at a temperature of 40 ° C. to 85 ° C. and a curing time of 2 hours to 36 hours. At this time, the temperature rising rate is 12 ° C / h to 33 ° C / h, and the maximum temperature is 60 ° C to 75 ° C.
Is preferred. Further, the pre-positioning time before steam curing is preferably 1 to 12 hours. Furthermore, this curing can be repeated as needed.
【００１５】本発明では、この蒸気養生によりいっそう
１０％〜２５％の気孔率と８ＭＰａ以上の曲げ強度にな
るように促進される。しかしてこの範囲の気孔率を有す
ることによりコンクリートを打設すると、コンクリート
の成分がこの気孔中に流入し、該型枠と打設コンクリー
トとが一体化され、かつ余剰水が吸収されて高強度とな
り、更に耐候性に優れたものが得られる。したがって気
孔率が１０％未満の場合には、水分を含むコンクリート
の成分が十分流入しないので、型枠の性能が不十分とな
り、また気孔率が２５％を越えると型枠の成分素材が少
なくなるので、十分な耐久性が得られない。また本発明
において形成される気孔乃至細孔の大きさは、直径１０
Å〜２，５００Åが好ましい。更に本発明のコンクリー
ト用永久埋設型枠の製造方法では、８ＭＰａ以上、好ま
しくは８ＭＰａ〜４５ＭＰａの曲げ強度を有する好まし
い埋設型枠が得られる。また成形用型枠により成形され
た埋設型枠は、オートクレーブ室に入れて、高温・高圧
養生される。この高温・高圧養生は、オートクレーブ室
へ前記埋設型枠を送って、温度１５０℃〜２００℃、養
生時間は２時間〜１０時間で行われる。この際昇温速度
は５０℃／ｈ〜８０℃／ｈで、最高温度１７０℃〜１９
０℃が好ましい。またこの養生は必要に応じて繰り返す
ことができる。これらの養生のうち、高温・高圧養生が
好ましい。In the present invention, this steam curing accelerates the porosity to 10% to 25% and the bending strength to 8 MPa or more. However, when concrete is poured by having a porosity in this range, the components of the concrete flow into the pores, the formwork and the poured concrete are integrated, and excess water is absorbed to obtain high strength. Therefore, a product having excellent weather resistance can be obtained. Therefore, when the porosity is less than 10%, the components of the concrete containing water do not sufficiently flow in, so that the performance of the form becomes insufficient, and when the porosity exceeds 25%, the component material of the form becomes small. Therefore, sufficient durability cannot be obtained. The size of the pores or pores formed in the present invention is 10 mm in diameter.
Å-2,500Å is preferable. Furthermore, according to the method for producing a permanent buried formwork for concrete of the present invention, a preferable buried formwork having a bending strength of 8 MPa or more, preferably 8 MPa to 45 MPa can be obtained. Further, the embedded formwork formed by the formwork for molding is put in an autoclave chamber and cured at high temperature and high pressure. This high temperature / high pressure curing is carried out at a temperature of 150 ° C. to 200 ° C. and a curing time of 2 hours to 10 hours by sending the embedded formwork to the autoclave chamber. At this time, the temperature rising rate is 50 ° C / h to 80 ° C / h, and the maximum temperature is 170 ° C to 19 ° C.
0 ° C is preferred. This regimen can also be repeated as needed. Of these cures, high temperature and high pressure cures are preferred.
【００１６】本発明のコンクリート用永久埋設型枠の他
の製造方法においては、前記の如く混練した混練物を鉄
筋と共に押出し成形機に導入して押出し成形する。この
押出し成形は、この技術分野で通常用いられる押出し成
形方法でよく、例えば押出し機を使用して押出し用ダイ
から、混練物を押出して所望の形状に成形する。この混
練物の押出しは、シリンダー中のスクリューにより連続
的に押し出す方法である。本発明においては、このよう
に押出し成形した埋設型枠は、オートクレーブ室に入れ
て、高温・高圧養生される。この高温・高圧養生は、オ
ートクレーブ室へ前記埋設型枠を送って、温度１５０℃
〜２００℃（１０ｋｇｆ／ｃｍ2 〜１５ｋｇｆ／ｃ
ｍ2 ）、養生時間は２時間〜１０時間で行われる。この
際昇温速度は５０℃／ｈ〜８０℃／ｈで、最高温度１７
０℃〜１９０℃が好ましい。またこの養生は必要に応じ
て繰り返すことができる。また他の養生方法としては、
押出し成形した埋設型枠は、養生室に入れて、蒸気養生
される。この蒸気養生は、高温の蒸気を養生室へ送って
大気圧下で、温度４０℃〜８５℃、養生時間は２時間〜
３６時間で行われる。この際昇温速度は１２℃／ｈ〜３
３℃／ｈで、最高温度６０℃〜７５℃が好ましい。また
蒸気養生するまでの前置時間は１時間〜１２時間が望ま
しい。更にこの養生は必要に応じて繰り返すことができ
る。これらの養生の他、気中養生することもでき、これ
は通常このコンクリートの養生の技術分野のおいては周
知乃至慣用されている。In another method for manufacturing a permanent buried formwork for concrete of the present invention, the kneaded product kneaded as described above is introduced into an extrusion molding machine together with the reinforcing bar and extrusion-molded. This extrusion molding may be an extrusion molding method usually used in this technical field. For example, an extruder is used to extrude the kneaded product from an extrusion die to form a desired shape. The extrusion of this kneaded material is a method of continuously extruding it by a screw in a cylinder. In the present invention, the embedded mold thus extruded is put in an autoclave chamber and cured at high temperature and high pressure. This high temperature and high pressure curing sends the above-mentioned buried form to the autoclave chamber, and the temperature is 150 ° C.
~ 200 ° C (10 kgf / cm 2 ~ 15 kgf / c
m 2 ) and curing time is 2 to 10 hours. At this time, the heating rate is 50 ° C / h to 80 ° C / h, and the maximum temperature is 17 ° C.
0 ° C to 190 ° C is preferable. This regimen can also be repeated as needed. As another curing method,
The extrusion-molded buried formwork is put into a curing room and steam-cured. In this steam curing, high-temperature steam is sent to the curing chamber and the temperature is 40 ° C to 85 ° C under the atmospheric pressure, and the curing time is 2 hours to.
It takes 36 hours. At this time, the heating rate is 12 ° C./h to 3
A maximum temperature of 60 ° C to 75 ° C at 3 ° C / h is preferable. Further, the pre-positioning time before steam curing is preferably 1 to 12 hours. Furthermore, this curing can be repeated as needed. In addition to these curing methods, it is also possible to perform curing in the air, which is generally known or commonly used in the technical field of curing this concrete.
【００１７】本発明に用いられるコンクリート用永久埋
設型枠は、任意の形状のものが製造されるが、特に打設
コンクリートと接する面は、平面でも凹凸を有していて
もよいが、好ましくは凹凸を有するのがよい。型枠が凹
凸を有する場合には、この凹部に打設コンクリート用鉄
筋を配置するのがよい。また該凹凸の形状としては、波
型、ジグザグ型、富士山型、コの字型等が挙げられる。
凹部と凸部とが対称形であっても非対称形であってもよ
く、更にこれらの形状を組み合わせたものでもよい。本
発明に用いられる型枠素材には、砂、砂利等の骨材を加
えることができ、更に必要に応じて従来この技術分野に
おいてよく知られている添加物乃至混和材料を加えるこ
とができる。The permanent buried formwork for concrete used in the present invention is produced in any shape, and the surface in contact with the poured concrete may be flat or uneven, but is preferably. It is good to have unevenness. When the formwork has irregularities, it is preferable to place the reinforcing bars for the cast concrete in the depressions. Examples of the shape of the unevenness include a corrugated shape, a zigzag shape, a Mt. Fuji shape, and a U-shape.
The concave portion and the convex portion may be symmetrical or asymmetrical, or may be a combination of these shapes. Aggregates such as sand and gravel can be added to the mold material used in the present invention, and if necessary, additives or admixtures well known in the art can be added.
【００１８】[0018]
【作用】本発明では、セメント、繊維、シリカ、砂、粘
土及び水の配合物を混練した後、鉄筋を配置した成形用
型枠を用いて成形する際、該配合物に可塑剤を添加して
混練することにより、得られた混練物は良好な成形性の
もとに成形される。ついで該成形物である埋設型枠を蒸
気養生あるいは高温・高圧養生したので、気孔率が１０
％〜２５％であり、かつ曲げ強度が８ＭＰａ以上という
条件を満たす埋設型枠を製造することができる。しかも
この埋設型枠に鉄筋を入れることにより、埋設型枠が補
強されコンクリートの打設時における破壊を防止するこ
とができる。またこの型枠素材からなる埋設型枠は、コ
ンクリートを打設した後、該型枠とコンクリート間で一
体化されて高強度のコンクリート構造物を得ることがで
きる。In the present invention, after the mixture of cement, fiber, silica, sand, clay and water is kneaded, a plasticizer is added to the mixture at the time of molding using a molding frame in which reinforcing bars are arranged. By kneading and kneading, the obtained kneaded product is molded with good moldability. Then, the molded form, which is the molded product, was steam-cured or high-temperature / high-pressure cured, so that the porosity was 10%.
% To 25%, and a buried formwork that satisfies the condition that the bending strength is 8 MPa or more can be manufactured. In addition, by inserting a reinforcing bar into this buried formwork, the buried formwork is reinforced and it is possible to prevent the concrete from being destroyed during pouring. Further, the embedded formwork made of this formwork material can be cast into concrete and then integrated between the formwork and the concrete to obtain a high-strength concrete structure.
【００１９】[0019]
【実施例】以下、本発明の実施例を挙げて更に詳しく説
明するが、本発明は、この例によって限定されるもので
はない。EXAMPLES Hereinafter, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples.
【００２０】実施例１ 図１の部分斜視図で示される埋設型枠を製造し、これを
用いてコンクリートを打設し、コンクリート構造物を形
成した。図１において、埋設型枠１は、該埋設型枠１の
裏面に凸部１１と凹部１２を有し、凸部には鉄筋３２を
有している。埋設型枠用混練物は、セメント４１重量
％、砂１０重量％、繊維（カーボン繊維（ピッチ系）、
直径０．０１４５ｍｍ、長さ１０ｍｍ、アスペクト比６
９０）２重量％、シリカ（平均粒径１０μｍ）１５重量
％、粘土１０重量％、可塑剤としてメチルセルロース
２．０重量％及び水２０重量％を配合し、この配合物を
６分間混練し、均一な混練物を得た。ついでこの混練物
からなる型枠用素材を直径１０ｍｍの鉄筋を配置した成
形用型枠に導入して、巾３００ｍｍ、厚み（凸部）２５
ｍｍ、長さ３，０００ｍｍの埋設型枠１を成形した。充
填性および成形性は十分良好であった。ついで該成形物
を蒸気養生室を搬入し、大気圧下、前置き時間４時間、
昇温速度１５℃／時間で大気圧下、温度６０℃、養生時
間１６時間で養生した。このようにして得られた埋設型
枠１は、耐候性及び強度の優れ、高耐久性であった。Example 1 An embedded formwork shown in the partial perspective view of FIG. 1 was manufactured, and concrete was poured using this to form a concrete structure. In FIG. 1, the embedded formwork 1 has a convex portion 11 and a concave portion 12 on the back surface of the embedded formwork 1, and a reinforcing bar 32 on the convex portion. The kneaded product for the buried formwork comprises 41% by weight of cement, 10% by weight of sand, fiber (carbon fiber (pitch type),
Diameter 0.0145mm, length 10mm, aspect ratio 6
90) 2% by weight, 15% by weight of silica (average particle size 10 μm), 10% by weight of clay, 2.0% by weight of methylcellulose as a plasticizer and 20% by weight of water were mixed, and the mixture was kneaded for 6 minutes to obtain a uniform mixture. A kneaded product was obtained. Then, the material for a mold made of this kneaded product was introduced into a molding mold in which a reinforcing bar having a diameter of 10 mm was arranged, and a width of 300 mm and a thickness (convex portion) 25
The embedded formwork 1 having a length of 3,000 mm and a length of 3,000 mm was molded. The fillability and moldability were sufficiently good. Then, the molded product was loaded into a steam curing chamber and placed under atmospheric pressure for a pre-positioning time of 4 hours,
Curing was performed at a temperature rising rate of 15 ° C./hour under atmospheric pressure at a temperature of 60 ° C. and a curing time of 16 hours. The buried formwork 1 thus obtained was excellent in weather resistance and strength and had high durability.
【００２１】このようにして得られた鉄筋３２の入った
埋設型枠１を使用して図２の部分斜視図に示される如
く、コンクリート２を打設してコンクリート構造物の試
供品を作製した。この際鉄筋３１は埋設型枠１の凹部１
２とコンクリート２の外面側に配置されている。ついで
この試供品を前記の蒸気養生と同様にして養生した。こ
の試供品を用いて耐久性の試験をし、その結果を表１に
示した。比較例としては、コンクリート製型枠を用い、
この型枠にコンクリートを打設してコンクリート構造物
を形成した。また強度はシュミットハンマーの反発係数
より求めた。As shown in the partial perspective view of FIG. 2, using the thus obtained buried formwork 1 containing the reinforcing bars 32, concrete 2 was poured to prepare a sample of a concrete structure. . At this time, the reinforcing bar 31 is the recess 1 of the buried formwork 1.
2 and the outer side of the concrete 2. This sample was then cured in the same manner as steam curing described above. A durability test was conducted using this sample, and the results are shown in Table 1. As a comparative example, using a concrete formwork,
Concrete was poured into this formwork to form a concrete structure. The strength was calculated from the coefficient of restitution of the Schmidt hammer.
【００２２】実施例２ 実施例１に記載された養生方法として、蒸気養生に代え
て高温・高圧養生を行って埋設型枠１を成形した以外
は、実施例１と同様に鉄筋入り埋設型枠１を製造した。
この高温・高圧養生は、成形物をオートクレーブ室に搬
入し、温度１７９℃（１０ｋｇｆ／ｃｍ2 ）、養生時間
５時間で養生した。このようにして得られた結果を表１
に示した。Example 2 As the curing method described in Example 1, the embedded formwork 1 with reinforcing bars was formed in the same manner as in Example 1 except that the embedded formwork 1 was molded by performing high temperature and high pressure cure instead of steam curing. 1 was produced.
In this high temperature / high pressure curing, the molded product was carried into an autoclave chamber and cured at a temperature of 179 ° C. (10 kgf / cm 2 ) for a curing time of 5 hours. The results thus obtained are shown in Table 1.
It was shown to.
【００２３】実施例３ 実施例１に記載された成形方法として、押出し成形機を
用いて鉄筋と共に押出し成形して埋設型枠１を製造した
以外は、実施例１と同様に鉄筋入り埋設型枠１を製造し
た。充填性および成形性は十分良好であった。得られた
結果を表１に示す。Example 3 As the molding method described in Example 1, an embedded formwork with a reinforcing bar was manufactured in the same manner as in Example 1 except that the embedded formwork 1 was manufactured by extrusion molding together with the reinforcing bar using an extrusion molding machine. 1 was produced. The fillability and moldability were sufficiently good. The results obtained are shown in Table 1.
【００２４】実施例４ 実施例１に記載された成形方法として、押出し成形機を
用いて鉄筋と共に押出し成形して埋設型枠１を成形する
と共に、実施例２の高温・高圧養生を行って埋設型枠１
を成形した以外は、実施例１と同様に鉄筋入り埋設型枠
１を製造した。充填性および成形性は十分良好であっ
た。得られた結果を表１に示す。Example 4 As the molding method described in Example 1, an extrusion molding machine was used for extrusion molding together with the reinforcing bar to mold the embedded formwork 1, and at the same time, high temperature and high pressure curing of Example 2 was carried out for burying. Formwork 1
An embedded formwork 1 containing reinforcing bars was manufactured in the same manner as in Example 1 except that the above was molded. The fillability and moldability were sufficiently good. The results obtained are shown in Table 1.
【００２５】[0025]
【表１】 [Table 1]
【００２６】表１から明らかなように、本発明の各製造
方法により得られた鉄筋入り埋設型枠は、曲げ強度が大
きく、したがって施工時にこの埋設型枠は破壊される恐
れがない。また該埋設型枠を使用したコンクリート構造
物は強度を始め、耐候性に優れていることがわかる。As is clear from Table 1, the embedded formwork containing reinforcing bars obtained by the respective manufacturing methods of the present invention has a large bending strength, and therefore there is no risk of the embedded formwork being destroyed during construction. Further, it can be seen that the concrete structure using the embedded formwork has excellent weather resistance as well as strength.
【００２７】実施例５ 実施例１において、蒸気養生に代えて高温・高圧養生を
し、また繊維としてカーボン繊維にかえて表２に示され
るものを用いた以外は、実施例１と同様にして鉄筋の入
った埋設型枠１を製造した。得られた結果を表２に示し
た。Example 5 In the same manner as in Example 1, except that high temperature and high pressure curing was carried out in place of steam curing and carbon fiber was changed to carbon fiber as shown in Table 2. A buried formwork 1 containing reinforcing bars was manufactured. The obtained results are shown in Table 2.
【表２】 [Table 2]
【００２８】実施例６ 実施例１に記載の配合物として、セメント、繊維、シリ
カ、砂及び粘土を混合し、得られた混合物にメチルセル
ロース及び水を添加し、混練して混練物を製造する以外
は、実施例１と同様にして埋設型枠を形成し、ついで実
施例１と同様にしてコンクリート構造物を作製した。こ
の様にして得られた埋設型枠は耐候性及び曲げ強度に優
れ、高耐久性であった。コンクリート構造物も同様に耐
候性及び強度に優れていた。Example 6 The procedure of Example 1 was repeated except that cement, fiber, silica, sand and clay were mixed, methyl cellulose and water were added to the mixture, and the mixture was kneaded to produce a kneaded product. A buried formwork was formed in the same manner as in Example 1, and then a concrete structure was prepared in the same manner as in Example 1. The embedded formwork thus obtained was excellent in weather resistance and bending strength and had high durability. The concrete structure was similarly excellent in weather resistance and strength.
【発明の効果】本発明の埋設型枠及びその製造方法は、
セメント、繊維、シリカ、砂、粘土及び水の配合物に可
塑剤を添加して混練した後、鉄筋を配置した成形型枠を
用いて成形するか又は押出し成形したので、良好な充填
性及び成形性のもとに成形され、ついで、該成形物を蒸
気養生又は高温・高圧養生したことにより、気孔率が１
０％〜２５％であり、かつ曲げ強度が８ＭＰａ以上とい
う条件を満たす鉄筋入り埋設型枠を製造することがで
き、したがってこの鉄筋入り埋設型枠は、特に曲げ強度
に優れ、施工時等に破壊される恐れがないと共に耐候性
に優れたコンクリート用永久埋設型枠が得られる。特に
高温・高圧養生することにより顕著な効果を得る。更に
この埋設型枠を用いてコンクリートを打設したコンクリ
ート構造物は、型枠とコンクリート間が一体化されて高
強度かつ耐候性に優れた高耐久性のコンクリート構造物
が得られるという格別顕著な効果を奏するものである。The buried formwork and the manufacturing method thereof according to the present invention are
Good plasticity and molding are achieved by adding a plasticizer to a mixture of cement, fiber, silica, sand, clay and water, and then kneading and then molding using a molding frame in which reinforcing bars are arranged or extrusion molding. Of the porosity of 1 by being molded under the following conditions and then steam-cured or high-temperature / high-pressure cured.
It is possible to manufacture a reinforcing bar-embedded formwork that satisfies the condition of 0% to 25% and a bending strength of 8 MPa or more. Therefore, this reinforcing bar-embedded formwork is particularly excellent in bending strength and is destroyed during construction. It is possible to obtain a permanent buried formwork for concrete that has no fear of being damaged and has excellent weather resistance. In particular, a remarkable effect is obtained by curing at high temperature and high pressure. Furthermore, a concrete structure in which concrete is poured using this buried formwork is particularly remarkable in that the formwork and the concrete are integrated to obtain a high-strength and highly durable concrete structure with excellent weather resistance. It is effective.
【図１】本発明のコンクリート用永久埋設型枠を示す部
分斜視図である。FIG. 1 is a partial perspective view showing a permanent buried formwork for concrete of the present invention.
【図２】本発明のコンクリート用永久埋設型枠を使用し
たコンクリート構造物を示す部分斜視図である。FIG. 2 is a partial perspective view showing a concrete structure using the permanent buried formwork for concrete of the present invention.
１ 埋設型枠 ２ 打設コンクリート １１ 凹部 ３１、３２ 鉄筋 １２ 凸部 1 Embedded formwork 2 Casting concrete 11 Recessed parts 31, 32 Rebar 12 Convex part
───────────────────────────────────────────────────── フロントページの続き (72)発明者 河原 幸則 埼玉県大宮市北袋町一丁目297番地 三菱 マテリアル株式会社セメント研究所内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yukinori Kawahara 1-297 Kitabukuro-cho, Omiya City, Saitama Mitsubishi Materials Corporation Cement Research Institute
Claims (13)
の曲げ強度を有するコンクリート用永久埋設型枠であっ
て、型枠素材がセメント、繊維、シリカ、砂、粘土、可
塑剤及び水からなり、かつ前記埋設型枠は鉄筋を有する
ことを特徴とするコンクリート用永久埋設型枠。1. A permanent buried formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, wherein the formwork material is cement, fiber, silica, sand, clay, plasticizer and water. And a permanent buried formwork for concrete, wherein the buried formwork has a reinforcing bar.
ことを特徴とする請求項１に記載のコンクリート用永久
埋設型枠。2. The permanent buried formwork for concrete according to claim 1, which has a bending strength of 8 MPa to 45 MPa.
１重量％〜１０重量％、砂５重量％〜３０重量％、シリ
カ１０重量％〜４０重量％、粘土５重量％〜３０重量％
及び可塑剤０．１重量％〜３重量％からなることを特徴
とする請求項１又は請求項２のいずれかに記載のコンク
リート用永久埋設型枠。3. Cement 25% to 55% by weight, fiber 1% to 10% by weight, sand 5% to 30% by weight, silica 10% to 40% by weight, clay 5% to 30% by weight.
And 0.1% to 3% by weight of a plasticizer, The permanent buried formwork for concrete according to claim 1 or 2, wherein
又は合成繊維から選ばれた少なくとも１種以上であるこ
とを特徴とする請求項１乃至請求項３のいずれかに記載
のコンクリート用永久埋設型枠。4. The permanent for concrete according to claim 1, wherein the fibers are at least one selected from inorganic natural fibers, organic natural fibers and synthetic fibers. Embedded formwork.
を特徴とする請求項１乃至請求項４のいずれかに記載の
コンクリート用永久埋設型枠。5. The permanent buried formwork for concrete according to claim 1, wherein the back surface of the formwork is formed in an uneven shape.
のコンクリート用永久埋設型枠と打設コンクリートから
なるコンクリート構造物。6. A concrete structure comprising the permanent buried formwork for concrete according to claim 1 and cast concrete.
の曲げ強度を有するコンクリート用永久埋設型枠の製造
方法において、セメント、繊維、シリカ、砂、粘土、可
塑剤及び水の配合物を混練し、得られた混練物を鉄筋と
共に成形し、ついで得られた成形物を蒸気養生すること
を特徴とするコンクリート用永久埋設型枠の製造方法。7. A method for producing a permanent buried formwork for concrete having a porosity of 10% to 25% and a bending strength of 8 MPa or more, wherein a mixture of cement, fiber, silica, sand, clay, a plasticizer and water is added. A method for producing a permanent buried formwork for concrete, which comprises kneading, molding the obtained kneaded product together with a reinforcing bar, and then subjecting the obtained molded product to steam curing.
とを特徴とする請求項７に記載のコンクリート用永久埋
設型枠の製造方法。8. The method for producing a permanent buried formwork for concrete according to claim 7, wherein a forming formwork is used as the forming means.
とを特徴とする請求項７に記載のコンクリート用永久埋
設型枠の製造方法。9. The method for producing a permanent buried formwork for concrete according to claim 7, wherein extrusion molding is used as the molding means.
量％、繊維１重量％〜１０重量％、砂５重量％〜３０重
量％、シリカ１０重量％〜４０重量％、粘土５重量％〜
３０重量％及び可塑剤０．１重量％〜３重量％からなる
ことを特徴とする請求項７乃至請求項９のいずれかに記
載のコンクリート用永久埋設型枠の製造方法。10. The composition comprises 25% to 55% by weight cement, 1% to 10% fiber by weight, 5% to 30% sand, 10% to 40% silica, 5% clay.
30% by weight and 0.1% to 3% by weight of a plasticizer, The method for producing a permanent buried formwork for concrete according to any one of claims 7 to 9.
維又は合成繊維から選ばれた少なくとも１種以上である
ことを特徴とする請求項７乃至請求項１０のいづれかに
記載のコンクリート用永久埋設型枠の製造方法。11. The permanent embedding material for concrete according to claim 7, wherein the fiber is at least one selected from inorganic natural fibers, organic natural fibers and synthetic fibers. Formwork manufacturing method.
高圧養生することを特徴とする請求項７乃至請求項１１
のいづれかに記載のコンクリート用永久埋設型枠の製造
方法。12. As the curing, instead of steam curing, high temperature /
High-pressure curing is carried out, The said Claim 7 thru | or 11 characterized by the above-mentioned.
A method for producing a permanent buried formwork for concrete according to any one of 1.
生することを特徴とする請求項７乃至請求項１１のいづ
れかに記載のコンクリート用永久埋設型枠の製造方法。13. The method for producing a permanent buried formwork for concrete according to claim 7, wherein the curing is performed in air instead of steam curing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8528694A JPH07268995A (en) | 1994-04-01 | 1994-04-01 | Permanent buried form for highly durable concrete, and its manufacture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8528694A JPH07268995A (en) | 1994-04-01 | 1994-04-01 | Permanent buried form for highly durable concrete, and its manufacture |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07268995A true JPH07268995A (en) | 1995-10-17 |
Family
ID=13854333
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8528694A Withdrawn JPH07268995A (en) | 1994-04-01 | 1994-04-01 | Permanent buried form for highly durable concrete, and its manufacture |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07268995A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT500244A1 (en) * | 2004-01-07 | 2005-11-15 | Schotter Und Betonwerk Karl Sc | FRESH-CONCRETE, FIXED CONDITION AND METHOD FOR THE PRODUCTION THEREOF AND THE USE OF THE FIXED CONCRETE |
| JP2008200586A (en) * | 2007-02-19 | 2008-09-04 | Shimizu Corp | Method for cement solidification of asbestos waste |
| CN107905519A (en) * | 2017-12-29 | 2018-04-13 | 长沙紫宸科技开发有限公司 | A kind of permanent protection template for building |
| CN107916782A (en) * | 2017-12-29 | 2018-04-17 | 长沙紫宸科技开发有限公司 | A kind of cast-in-situ steel reinforced concrete beam column protectiveness rib template |
-
1994
- 1994-04-01 JP JP8528694A patent/JPH07268995A/en not_active Withdrawn
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT500244A1 (en) * | 2004-01-07 | 2005-11-15 | Schotter Und Betonwerk Karl Sc | FRESH-CONCRETE, FIXED CONDITION AND METHOD FOR THE PRODUCTION THEREOF AND THE USE OF THE FIXED CONCRETE |
| AT500244B1 (en) * | 2004-01-07 | 2007-07-15 | Schotter Und Betonwerk Karl Sc | FRESH-CONCRETE, FIXED CONDITION AND METHOD FOR THE PRODUCTION THEREOF AND THE USE OF THE FIXED CONCRETE |
| JP2008200586A (en) * | 2007-02-19 | 2008-09-04 | Shimizu Corp | Method for cement solidification of asbestos waste |
| CN107905519A (en) * | 2017-12-29 | 2018-04-13 | 长沙紫宸科技开发有限公司 | A kind of permanent protection template for building |
| CN107916782A (en) * | 2017-12-29 | 2018-04-17 | 长沙紫宸科技开发有限公司 | A kind of cast-in-situ steel reinforced concrete beam column protectiveness rib template |
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