JP4148683B2 - Method for producing a concrete product having a hollow part - Google Patents

Method for producing a concrete product having a hollow part Download PDF

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JP4148683B2
JP4148683B2 JP2002027605A JP2002027605A JP4148683B2 JP 4148683 B2 JP4148683 B2 JP 4148683B2 JP 2002027605 A JP2002027605 A JP 2002027605A JP 2002027605 A JP2002027605 A JP 2002027605A JP 4148683 B2 JP4148683 B2 JP 4148683B2
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resin pipe
concrete product
concrete
predetermined
manufacturing
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JP2003225904A (en
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政治 金子
隆博 村上
昌雄 三浦
由紀雄 宮井
隆 岩佐
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隆 岩佐
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Description

【０００１】
【発明の属する技術分野】
暗渠ブロック、梁、床版ブロック、擁壁ブロック等中空部を有するコンクリート製品の製造方法であって、コンクリート製品製造用型枠に中空部を形成する中子部材として所要形状の樹脂パイプを所定位置に装着して、コンクリートを投入し締め固めを行い、蒸気養生槽内で所定時間所定温度の蒸気養生をし、所定時間後コンクリート製品製造用型枠を蒸気養生槽内から取り出し、中子部材を装着したままコンクリート製品を脱型し、コンクリート製品の温度が常温近傍迄自然降下することによる樹脂パイプの温度降下あるいは冷却や空冷等による強制冷却させた樹脂パイプの温度降下から樹脂パイプが所定寸法に収縮した時点でコンクリートブロックの中空部から抜去する、中空部を有するコンクリート製品の製造方法に関する。
【０００２】
また、中子部材として使用した樹脂パイプを再度中子部材として使用する、中空部を有するコンクリート製品の製造方法に関する。
【０００３】
【従来の技術】
図７を用い従来技術の中空部を有するコンクリート製品（一例として暗渠ブロック）の製造方法を説明する。汎用されている暗渠ブロックの製造用型枠ＫＴは、ベース１の前後に図示省略の前後の妻板と左右に側板２を枢着し、暗渠ブロック打設時には前記ベース上に金網を装着して左右の側板２と前後の妻板を閉じ、前後妻板に開口する中子挿入孔から回動螺杆とリンク機構による伸縮装置Ｅ等を内設した鋼板等の周縁が伸縮可能な中子部材Ｎを縮径させて挿入し挿入後に拡幅させて、コンクリートを投入し締め固めを行った後、蒸気養生槽に搬入し所定時間所定温度の養生後、蒸気養生槽から出して製造用型枠ＫＴを搬出し、前記中子部材Ｎの伸縮装置Ｅを操作して縮径させて、製造用型枠ＫＴ内から中子部材Ｎを抜き取り製造用型枠ＫＴの前後の妻板と左右の側板２を開いて暗渠ブロックを脱型している。係る製造方法では流水路となる中空部Ｈを形成するため、伸縮装置Ｅ等を内設した機構であることから製造用型枠ＫＴが高価となり打設、脱型の度に数１００ｋｇもある中子部材Ｎの着脱のため作業効率も悪く、鋼板等の中子部材Ｎは着脱の都度拡幅縮径を繰り返すため中子部材Ｎの寿命も短く修理の度に生産が阻害される等多くの欠点があった。
【０００４】
また、暗渠ブロックの全長は前記中子部材Ｎが２ｍ以上の場合は均等な縮径が困難なため、一部で使用されている長さ４ｍ上面開放のＵ字溝のような製品は造れなかった。
【０００５】
【発明が解決しようとする課題】
本発明の目的は、前記事情に鑑み案出されたもので、従来技術の欠点を排除するため、本発明の課題解決のため試作実験を繰返しコンクリート製造用型枠の中子部材に樹脂パイプを使用して、中空部を成形する中子部材が打設時に所定寸法で、脱型時には中空部寸法より縮径して容易に中子部材を抜去可能にする、中空部を有するコンクリート製品の製造方法を提供すること。
【０００６】
【課題を解決するための手段】
上記課題を解決するための創出だれた本発明は、試作実験の結果、好ましくは樹脂パイプの素材としてポリエチレン、ポリプロピレン等が適宜使用され、本発明の請求項１では、暗渠ブロック、梁、床版ブロック、擁壁ブロック等中空部を有するコンクリート製品の製造方法であって、
第１工程は、前記コンクリート製品製造用型枠に、所定形状寸法の中空部を形成する中子部材として所定形状寸法の樹脂パイプを所定位置に装着してコンクリート製品製造用型枠を閉じ、
第２工程は、コンクリートを投入し締め固めを行い、
第３工程は、蒸気養生槽内で所定時間所定温度の蒸気養生を行い、
第４工程は、所定時間後、コンクリート製品製造用型枠を蒸気養生槽内から取り出しコンクリート製品製造用型枠を開き、中子部材である樹脂パイプを装着したままコンクリート製品を脱型し、
第５工程は、コンクリート製品の温度を常温近傍まで自然冷却させることで樹脂パイプを冷却するか、水冷や空冷等により樹脂パイプを強制冷却させ、温度降下により縮径した樹脂パイプを所定形状寸法に成形された中空部内から抜去し、再度中子部材として使用する中空部を有するコンクリート製品の製造方法において、
前記樹脂パイプとして、未使用または使用後の樹脂パイプを所定時間蒸気養生槽内に搬入し高温養生した後取り出し、常温近傍迄温度降下させて樹脂パイプを所定寸法に縮径させた後、前記第１工程に用いる、
ことを特徴とする中空部を有するコンクリート製品の製造方法を構成する。
【０００７】
また、上記課題を解決するため創出された本発明の請求項２では、暗渠ブロック、梁、床版ブロック、擁壁ブロック等中空部を有するコンクリート製品の製造方法であって、
第１工程は、前記コンクリート製品製造用型枠に、所定形状寸法の中空部を形成する中子部材として所定形状寸法の樹脂パイプを所定位置に装着してコンクリート製品製造用型枠を閉じ、
第２工程は、コンクリートを投入し締め固めを行い、
第３工程は、蒸気養生槽内で所定時間所定温度の蒸気養生を行い、
第４工程は、所定時間後、コンクリート製品製造用型枠を蒸気養生槽内から取り出しコンクリート製品製造用型枠を開き、中子部材である樹脂パイプを装着したままコンクリート製品を脱型し、
第５工程は、コンクリート製品の温度を常温近傍まで自然冷却させることで樹脂パイプを冷却するか、水冷や空冷等により樹脂パイプを強制冷却させ、温度降下により縮径した樹脂パイプを所定形状寸法に成形された中空部内から抜去し、再度中子部材として使用する中空部を有するコンクリート製品の製造方法において、
前記樹脂パイプとして、未使用または使用後の樹脂パイプを全長或いは全長と外周面の一部または全面を拘束して所定時間蒸気養生槽内に搬入し高温養生した後取り出し、常温近傍迄温度降下させて樹脂パイプを所定寸法に縮径させた後、前記第１工程に用いる、
ことを特徴とする中空部を有するコンクリート製品の製造方法を構成する。
【０００８】
また、上記課題を解決するため創出された本発明の請求項３では、コンクリート製品製造用型枠に、中子部材となる樹脂パイプを装着する場合に樹脂パイプの端部を内側或いは外側または内側と外側から拘束して支持する、ことを特徴とする請求項１または２に記載の中空部を有するコンクリート製品の製造方法を構成する。
【０００９】
更にまた、上記課題を解決するため創出された本発明の請求項４では、前記第１工程において、製造用型枠の所定位置に樹脂パイプの両端部を密閉せずに全長を拘束して装着する、ことを特徴とする請求項１乃至３いずれか記載の中空部を有するコンクリート製品の製造方法を構成する。
【００１０】
【発明の実施の形態】
〔実施例〕
図１は、本発明の請求項１乃至２に係る実施例の第１乃至第３工程の概略を示す説明図、図２は、本発明の請求項１乃至２に係る実施例の第４，第５工程の概略を示す説明図で、図４は、本発明の請求項１に係る実施例を示す説明図で、図５は、本発明の請求項２に係る実施例を示す説明図で、図３は、本発明の請求項３乃至４に係る実施例の概略を示す説明図である。以下各図により本発明の実施例を説明する。
【００１１】
図１は、本発明の請求項１乃至２に係る実施例の第１乃至第３工程の概略を示す説明図で、図１（ａ）に示すのは、中空部を有するコンクリート製品の一例として暗渠ブロック製造方法の第１工程を示す図で、暗渠ブロックＢの製造用型枠Ｋ（右側板３０は省略）に所要の鉄筋Ｍを挿入し流水路を成形する中子部材として所要形状寸法の樹脂パイプ２０を製造用型枠Ｋの前後妻板４０，４０（図３により後述する前後妻板の内面に樹脂パイプ２ ０端部の上側内面を所定位置に掬い揚げる機能を有する）閉じ時に樹脂パイプ２０を所定位置に端部内面或いは外面または端部の内面と外面から保持させて、矢符ｃｌの下部図に示すよう左右側板３０と前後妻板４０を閉じる。なお、前記樹脂パイプ２０は予め鉄筋Ｍ内に入れて同時に製造用型枠Ｋに挿入することもできる。
【００１２】
図１（ｂ）は第２工程を示す図で、製造用型枠Ｋ内にコンクリートＣを投入し製造用型枠Ｋに振動、または前後運動等Ｖを加えてコンクリートＣの締め固めを行う、下部図の（ｃ）は第３工程を示す図で、締め固めの終わった製造用型枠Ｋを、所定温度（４０°Ｃ〜６５°Ｃ範囲内の）蒸気養生槽ＳＲ内に搬送して所定時間（５乃至７時間）の蒸気養生をする。
【００１３】
図２は、本発明の請求項１乃至２に係る実施例の第４，第５工程の概略を示す説明図で、図２（ｄ）は第４工程を示す図で、所定時間後製造用型枠Ｋを蒸気養生槽ＳＲ内から搬出し、下部図のように製造用型枠Ｋの前後妻板４０，４０と左右側板３０，３０を開放し、樹脂パイプ２０を装着したまま暗渠ブロックＢを脱型する。
【００１４】
図２（ｅ）は第５工程を示す図で、暗渠ブロックＢを常温近傍迄自然冷却させることで樹脂パイプを冷却するか、水冷や空冷等により樹脂パイプを強制冷却させ、所定形状寸法に形成された中空部Ｈ内面と縮径した樹脂パイプ２０の間に空隙部ができるので、樹脂パイプ２０端部を掴んで中空部Ｈから容易に抜去可能な製造方法を構成した。
【００１５】
図４は、本発明の請求項１に係る実施例を示す説明図で、図４（ａ）の未使用または使用後の樹脂パイプ２０の下側を、長手方向に多点支持して樹脂パイプの撓みを予防し所定時間所定温度の蒸気養生槽ＳＲ内に搬入し高温養生した後、図示（ｂ）のよう搬出し、図示（ｃ）の状態で常温近傍迄温度降下させて所定寸法に縮径させた樹脂パイプ２０を、前出の図１（ａ）と同じく暗渠ブロック製造用型枠Ｋに金網Ｍと共に挿入し前記請求項１記載の第１工程に用いる、中空部を有するコンクリート製品の製造方法を構成している。なお、図４（ａ）および図４（ｂ）の一点鎖線のように蒸気養生槽の代わりに温水槽中で高温養生することもできる。
【００１６】
図５は、本発明の請求項２に係る実施例を示す説明図で、前記未使用または使用後の樹脂パイプ２０は、無拘束の場合と、図５のように開口部５２を設けた板状の拘束部材５０または拘束帯５５を加えて拘束した場合とで、どちらの場合とも常温近傍迄温度降下による縮径から、成形されたコンクリートブロックの中空部より抜去することができたが、樹脂パイプの全長縮み量では、無拘束の場合に約５ｍｍ程度縮んだのに対し、図５のように拘束した場合では約１３ｍｍ程度縮ませることができることから、拘束することで樹脂パイプの抜去をより容易に可能とする。
【００１７】
図３は、本発明の請求項３乃至４に係る実施例の概略を示す説明図で、前後妻板４０，４０の内面に設けた樹脂パイプ２０端部の支持方法を示し、製造用型枠Ｋ内に挿入した樹脂パイプ２０は前後妻板４０，４０閉じにより端部内面を掬い揚げて所定位置に支承されるよう斜面を形成した支承部材４４により誘導する、または端部内面からの支承に加え樹脂パイプの端部外面からもリング状の支持部材４６で拘束して支持し、同時に支持部材４６で目地部を中空部Ｈ入口に形成して、暗渠ブロックＢの中空部Ｈを所定位置に許容寸法で成形可能にする。
【００１８】
更に、図３に示す開口部４２は、請求項４に係る実施例であって、前記第１工程において、前後妻板４０，４０に開口部４２を穿孔して樹脂パイプ２０の両端部を密閉しないで開放し、蒸気養生中温度上昇によって樹脂パイプ２０に加わる空気膨張による内圧の上昇を回避すると共に、製造用型枠の所定位置に全長を拘束することで所定の中空部成形寸法 を維持することを可能にする。
【００１９】
図６は本発明により製造可能となる各種コンクリート製品の概略図で、（ａ）乃至（ｆ）は中空部を有するコンクリート製品即ち暗渠ブロックの実施態様を示す図で符号Ｈは流水路または他の目的のための中空部で、（ｂ）に示すスリットＳＧ付の側溝、（ｄ）のグレーチングを載置する暗渠ブロック等は製造用型枠の底面に対応する型を装着し樹脂パイプを適用して容易に製造することができ、（ｇ）乃至（ｊ）の製品に付いても本発明を逸脱しない範囲で中空部Ｈ２を有するコンクリート製品を造ることができる。（ｊ）の製品は製造用型枠の底部に上部を閉鎖した樹脂パイプを片持ち支持して製造した有底のブロックである。
【００２０】
【発明の効果】
請求項１乃至２に係る本発明を適用すれば、中空部Ｈを形成するための伸縮装置Ｅ等を内設した中子部材が不要となり、製造用型枠の製作費と作業の労力と時間が半分になり中子部材の補修により生産が阻害されることもなく、作業効率が向上し製品価格がローコストになる効果がある。
【００２１】
また、請求項１乃至４に係る本発明を適用すれば、中子部材となる樹脂パイプが高温時と降下時の温度差による収縮差を記憶して、打設により成形された中空部寸法から容易に抜去可能なよう収縮するので何回も使用することができる経済効果がある。
【００２２】
また、暗渠ブロックの長さ４ｍ製品が製造可能となり、生産効率の向上と敷設作業が省力化できる効果もある。
【００２３】
更にまた、再度中子部材として使用した樹脂パイプは、数次の使用後収縮膨張の復元性が喪失した時点及び樹脂パイプ表面が損傷を受けた時点で回収し、新規製造の樹脂パイプ原料の一部としてリサイクルできる効果もある。
【図面の簡単な説明】
【図１】は、本発明の請求項１乃至２に係る実施例の第１乃至第３工程の概略を示す説明図である。
【図２】は、本発明の請求項１乃至２に係る実施例の第４，第５工程の概略を示す説明図である。
【図３】は、本発明の請求項３乃至４に係る実施例の概略を示す説明図である。
【図４】は、本発明の請求項１に係る実施例を示す説明図である。
【図５】は、本発明の請求項２に係る実施例を示す説明図である。
【図６】は、本発明により製造可能となる各種コンクリート製品の概略図である。
【図７】は、従来技術の説明図である。
【符号の説明】
Ｂ−暗渠ブロック
Ｃ−コンクリート
Ｈ−暗渠ブロックの中空部（流水路）
Ｋ−暗渠ブロック製造用型枠
Ｎ−従来技術の中子部材
Ｍ−金網
Ｖ−振動、または前後運動等の締め固め装置
ＳＲ−蒸気養生槽
２０−樹脂パイプ
３０−暗渠ブロック製造用型枠の左右側板
４０−暗渠ブロック製造用型枠の前後妻板
４２−前後妻板の開口部
４４−前後妻板内面に設けた支承部材
４６−前後妻板内面に設けた樹脂パイプの外周面を支持するリング状部材[0001]
BACKGROUND OF THE INVENTION
A method of manufacturing a concrete product having a hollow portion such as a culvert block, a beam, a floor slab block, a retaining wall block, etc., and a resin pipe having a required shape as a core member for forming the hollow portion in a concrete product manufacturing formwork at a predetermined position The concrete is put in and compacted, and steam curing is performed at a predetermined temperature for a predetermined time in the steam curing tank. After a predetermined time, the concrete product manufacturing formwork is taken out from the steam curing tank, and the core member is removed. The concrete product is removed from the mold while it is attached, and the resin pipe is adjusted to the specified dimensions from the temperature drop of the resin pipe due to the natural drop of the concrete product to near normal temperature or the forced drop of the resin pipe by cooling or air cooling. It is related with the manufacturing method of the concrete product which has a hollow part extracted from the hollow part of a concrete block, when shrinking.
[0002]
Moreover, it is related with the manufacturing method of the concrete product which has a hollow part which uses the resin pipe used as a core member again as a core member.
[0003]
[Prior art]
The manufacturing method of the concrete product (an culvert block as an example) which has a hollow part of a prior art using FIG. 7 is demonstrated. A widely used formwork KT for manufacturing a culvert block has a front panel and a side panel 2 pivoted to the left and right of the base 1 before and after the base 1, and a metal mesh is mounted on the base when the culvert block is placed. The side plate 2 and the front and rear end plates are closed, and a core member N whose outer periphery can be expanded and contracted, such as a steel plate or the like provided with a rotating screw and a telescopic device E by a link mechanism, is reduced in diameter from a core insertion hole opened in the front and rear end plates. After inserting and expanding, after putting concrete and compacting, it is carried into a steam curing tank, and after curing for a predetermined time at a predetermined temperature, it is removed from the steam curing tank and the production form KT is unloaded, The expansion / contraction device E of the core member N is operated to reduce the diameter, the core member N is extracted from the manufacturing formwork KT, the front and back side plates 2 and the left and right side plates 2 of the manufacturing formwork KT are opened, and a culvert block Is demolded. In such a manufacturing method, since the hollow portion H serving as a flowing water channel is formed, the mechanism KT for the expansion and contraction device E and the like is provided, so the manufacturing formwork KT becomes expensive, and there are several hundred kg each time it is placed and removed. The work efficiency is poor due to the attachment / detachment of the core member N, and the core member N, such as a steel plate, repeatedly expands and contracts each time it is attached / detached, so the life of the core member N is short and the production is hindered every time it is repaired. was there.
[0004]
In addition, since it is difficult to reduce the total length of the underdrain block when the core member N is 2 m or more, a product such as a U-shaped groove with a 4 m long open top surface that is used in part cannot be made. It was.
[0005]
[Problems to be solved by the invention]
The object of the present invention has been devised in view of the above circumstances, and in order to eliminate the disadvantages of the prior art, a trial experiment was repeated to solve the problems of the present invention, and a resin pipe was attached to the core member of a concrete manufacturing formwork. Use to manufacture a concrete product having a hollow portion in which the core member for forming the hollow portion has a predetermined size when placed, and when the mold is removed, the diameter is smaller than the hollow portion size so that the core member can be easily removed. Providing a method.
[0006]
[Means for Solving the Problems]
The present invention created to solve the above-mentioned problems is that, as a result of trial production, polyethylene, polypropylene, etc. are suitably used as the material of the resin pipe, and in claim 1 of the present invention, a culvert block, beam, floor slab A method for producing a concrete product having a hollow part such as a block or a retaining wall block ,
The first step is the concrete products manufacturing mold, close the resin pipe was attached to a predetermined position concrete products manufacturing mold of a predetermined shape and dimensions as the core member to form a hollow portion of a predetermined shape and size,
The second step, have a row compaction was charged with concrete,
The third step performs steam curing at a predetermined temperature for a predetermined time in a steam curing tank ,
In the fourth step, after a predetermined time, the concrete product manufacturing form is taken out of the steam curing tank, the concrete product manufacturing form is opened, and the concrete product is demolded with the resin pipe as the core member attached .
The fifth step is to cool the resin pipe by naturally cooling the concrete product to near room temperature, or forcibly cooling the resin pipe by water cooling, air cooling, etc., and reducing the diameter of the resin pipe to a predetermined shape by temperature drop. In the method for producing a concrete product having a hollow part that is removed from the molded hollow part and used again as a core member ,
As the resin pipe, an unused or used resin pipe is taken into a steam curing tank for a predetermined time, taken out after being cured at a high temperature, reduced in temperature to near normal temperature, and the resin pipe is reduced in diameter to a predetermined size, and then the first pipe is used. Used in one step,
The manufacturing method of the concrete product which has the hollow part characterized by this is comprised.
[0007]
Moreover, in Claim 2 of this invention created in order to solve the said subject, It is a manufacturing method of concrete products which have hollow parts, such as a culvert block, a beam, a floor slab block, and a retaining wall block,
In the first step, a concrete product manufacturing mold is closed at a predetermined position as a core member for forming a hollow portion of a predetermined shape on the concrete product manufacturing mold, and the concrete product manufacturing mold is closed.
In the second step, concrete is charged and compacted,
The third step performs steam curing at a predetermined temperature for a predetermined time in a steam curing tank,
In the fourth step, after a predetermined time, the concrete product manufacturing form is taken out of the steam curing tank, the concrete product manufacturing form is opened, and the concrete product is demolded with the resin pipe as the core member attached.
The fifth step is to cool the resin pipe by naturally cooling the concrete product to near room temperature, or forcibly cooling the resin pipe by water cooling, air cooling, etc., and reducing the diameter of the resin pipe to a predetermined shape by temperature drop. In the method for producing a concrete product having a hollow part that is removed from the molded hollow part and used again as a core member,
As the resin pipe, the unused or used resin pipe is taken into the steam curing tank for a predetermined time with the entire length or part of the entire length and the outer peripheral surface being restrained, taken out after high temperature curing, and the temperature is lowered to near room temperature. After reducing the diameter of the resin pipe to a predetermined dimension, used in the first step,
The manufacturing method of the concrete product which has the hollow part characterized by this is comprised.
[0008]
Moreover, in Claim 3 of this invention created in order to solve the said subject, when attaching the resin pipe used as a core member to the formwork for concrete product manufacture, the edge part of a resin pipe is made inside or outside or inside. The manufacturing method of the concrete product which has a hollow part of Claim 1 or 2 characterized by the above-mentioned .
[0009]
Furthermore , in claim 4 of the present invention created to solve the above problem, in the first step, the entire length of the resin pipe is constrained to the predetermined position of the manufacturing mold without being sealed. The manufacturing method of the concrete product which has a hollow part in any one of the Claims 1 thru | or 3 characterized by the above-mentioned is comprised.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
〔Example〕
FIG. 1 is an explanatory diagram showing an outline of first to third steps of an embodiment according to claims 1 to 2 of the present invention, and FIG. 2 is a fourth view of an embodiment according to claims 1 to 2 of the present invention. FIG. 4 is an explanatory diagram showing an outline of the fifth step, FIG. 4 is an explanatory diagram showing an embodiment according to claim 1 of the present invention, and FIG. 5 is an explanatory diagram showing an embodiment according to claim 2 of the present invention. FIG. 3 is an explanatory view showing the outline of the embodiment according to claims 3 to 4 of the present invention. Embodiments of the present invention will be described below with reference to the drawings.
[0011]
FIG. 1 is an explanatory view showing an outline of the first to third steps of an embodiment according to claims 1 and 2 of the present invention, and FIG. 1 (a) shows an example of a concrete product having a hollow portion. It is a figure which shows the 1st process of a culvert block manufacturing method. When the resin pipe 20 is closed, the resin pipe 20 is closed when the front and rear end plates 40, 40 of the manufacturing form K are closed (having a function of scooping up the upper inner surface of the resin pipe 20 at a predetermined position on the inner surface of the front and rear end plates described later with reference to FIG. 3 ). Is held at a predetermined position from the inner surface of the end portion or the outer surface or the inner surface and the outer surface of the end portion, and the left and right side plates 30 and the front and rear end plates 40 are closed as shown in the lower view of the arrow cl. The resin pipe 20 can be inserted in the reinforcing bar M and inserted into the manufacturing form K at the same time.
[0012]
FIG. 1 (b) is a diagram showing the second step, in which the concrete C is put into the production form K, and the concrete C is compacted by applying V or the like to the production form K, vibration or back-and-forth movement. (C) in the lower part is a diagram showing the third step, in which the compacted production form K is transported into the steam curing tank SR at a predetermined temperature (in the range of 40 ° C. to 65 ° C.). Steam curing for a predetermined time (5 to 7 hours).
[0013]
FIG. 2 is an explanatory view showing an outline of the fourth and fifth steps of the embodiment according to claims 1 and 2 of the present invention, and FIG. 2 (d) is a view showing the fourth step, for manufacturing after a predetermined time. The mold K is carried out of the steam curing tank SR, and the front and rear end plates 40, 40 and the left and right side plates 30, 30 of the manufacturing form K are opened as shown in the lower figure, and the culvert block B is attached with the resin pipe 20 attached. Demold.
[0014]
FIG. 2 (e) is a diagram showing the fifth step. The resin pipe is cooled by naturally cooling the underdrain block B to near room temperature, or the resin pipe is forcibly cooled by water cooling or air cooling to form a predetermined shape and dimension. Since a void portion is formed between the inner surface of the hollow portion H and the resin pipe 20 having a reduced diameter, a manufacturing method in which the end portion of the resin pipe 20 is grasped and can be easily removed from the hollow portion H is configured.
[0015]
FIG. 4 is an explanatory view showing an embodiment according to claim 1 of the present invention, and the lower side of the unused or used resin pipe 20 of FIG. After being carried into the steam curing tank SR at a predetermined temperature for a predetermined time and being cured at a high temperature, it is unloaded as shown in the figure (b), and the temperature is lowered to near room temperature in the state shown in the figure (c) to reduce it to a predetermined dimension. A resin pipe 20 having a diameter is inserted into a culvert block manufacturing form K together with a metal mesh M in the same manner as in FIG. 1 (a), and used for the first step of the concrete product having a hollow portion. It constitutes a manufacturing method. In addition, high temperature curing can also be performed in a hot water tank instead of the steam curing tank as shown by the one-dot chain line in FIGS. 4 (a) and 4 (b).
[0016]
FIG. 5 is an explanatory view showing an embodiment according to claim 2 of the present invention. The unused or used resin pipe 20 is unconstrained and a plate provided with an opening 52 as shown in FIG. In both cases, it was possible to remove from the hollow portion of the molded concrete block from the reduced diameter due to the temperature drop to near room temperature, in the case of restraint by adding a restraint member 50 or restraint band 55 in the form of resin. The total length of the pipe is reduced by about 5 mm when unconstrained, but can be reduced by about 13 mm when restrained as shown in FIG. 5. Easy to do.
[0017]
FIG. 3 is an explanatory view schematically showing an embodiment according to claims 3 to 4 of the present invention, showing a method for supporting the end portion of the resin pipe 20 provided on the inner surfaces of the front and rear end plates 40, 40, and a manufacturing form K The resin pipe 20 inserted therein is guided by a support member 44 having a slope so that the inner surface of the end is lifted by closing the front and rear end plates 40, 40, and is supported at a predetermined position, or in addition to the support from the inner surface of the end The ring-shaped support member 46 also restrains and supports it from the outer surface of the end portion of the pipe, and at the same time, a joint portion is formed at the inlet of the hollow portion H by the support member 46 so that the hollow portion H of the culvert block B is allowed to a predetermined position Can be molded.
[0018]
Furthermore, the opening 42 shown in FIG. 3 is an embodiment according to claim 4, and in the first step, the opening 42 is perforated in the front and rear end plates 40, 40 so that both ends of the resin pipe 20 are not sealed. In order to avoid a rise in internal pressure due to air expansion applied to the resin pipe 20 due to a temperature rise during steam curing, and to maintain a predetermined hollow portion molding dimension by constraining the entire length to a predetermined position of the manufacturing formwork Enable.
[0019]
FIG. 6 is a schematic view of various concrete products that can be produced according to the present invention. (A) to (f) are diagrams showing an embodiment of a concrete product having a hollow portion, that is, a culvert block. A hollow part for the purpose, a side groove with a slit SG shown in (b), a culvert block on which the grating of (d) is placed, etc., is attached with a mold corresponding to the bottom of the manufacturing formwork, and a resin pipe is applied. Thus, a concrete product having the hollow portion H2 can be produced without departing from the present invention even if it is attached to the products (g) to (j). The product (j) is a bottomed block manufactured by cantilevering a resin pipe whose upper part is closed at the bottom of a manufacturing formwork.
[0020]
【The invention's effect】
If the present invention according to claims 1 and 2 is applied, a core member having an expansion device E or the like for forming the hollow portion H becomes unnecessary, and the manufacturing cost of the manufacturing formwork, the labor and time of the work are required. The production is not hindered by repairing the core member and the work efficiency is improved and the product price is reduced.
[0021]
In addition, if the present invention according to claims 1 to 4 is applied, the resin pipe as the core member stores the difference in shrinkage due to the temperature difference between the high temperature and the descent, and from the dimension of the hollow portion formed by casting Since it shrinks so that it can be easily removed, there is an economic effect that can be used many times.
[0022]
Moreover, it becomes possible to manufacture products with a culvert block length of 4 m, which has the effect of improving production efficiency and saving labor for laying.
[0023]
Furthermore, the resin pipe used again as the core member is collected when the resilience of shrinkage and expansion after several uses is lost and when the surface of the resin pipe is damaged. There is also an effect that can be recycled as part.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing an outline of first to third steps of an embodiment according to claims 1 to 2 of the present invention.
FIG. 2 is an explanatory diagram showing an outline of fourth and fifth steps of an embodiment according to claims 1 to 2 of the present invention.
FIG. 3 is an explanatory view showing an outline of an embodiment according to claims 3 to 4 of the present invention.
FIG. 4 is an explanatory view showing an embodiment according to claim 1 of the present invention.
FIG. 5 is an explanatory view showing an embodiment according to claim 2 of the present invention.
FIG. 6 is a schematic view of various concrete products that can be produced according to the present invention.
FIG. 7 is an explanatory diagram of the prior art.
[Explanation of symbols]
B-Underdrain block C-Concrete H-Hollow portion of underdrain block (flow channel)
K-Formwork for manufacturing a culvert block N-Core member M of the prior art-Wire mesh V-Compaction device SR for vibration or back and forth motion SR-Steam curing tank 20-Resin pipe 30-Left and right of the mold for manufacturing the culvert block Side plate 40-Front and rear end plate 42 of mold for manufacturing culvert block-Opening 44 of front and rear end plate-Bearing member 46 provided on inner surface of front and rear end plate-Ring-shaped member supporting outer peripheral surface of resin pipe provided on inner surface of front and rear end plate

Claims (4)

暗渠ブロック、梁、床版ブロック、擁壁ブロック等中空部を有するコンクリート製品の製造方法であって、
第１工程は、前記コンクリート製品製造用型枠に、所定形状寸法の中空部を形成する中子部材として所定形状寸法の樹脂パイプを所定位置に装着してコンクリート製品製造用型枠を閉じ、
第２工程は、コンクリートを投入し締め固めを行い、
第３工程は、蒸気養生槽内で所定時間所定温度の蒸気養生を行い、
第４工程は、所定時間後、コンクリート製品製造用型枠を蒸気養生槽内から取り出しコンクリート製品製造用型枠を開き、中子部材である樹脂パイプを装着したままコンクリート製品を脱型し、
第５工程は、コンクリート製品の温度を常温近傍まで自然冷却させることで樹脂パイプを冷却するか、水冷や空冷等により樹脂パイプを強制冷却させ、温度降下により縮径した樹脂パイプを所定形状寸法に成形された中空部内から抜去し、再度中子部材として使用する中空部を有するコンクリート製品の製造方法において、
前記樹脂パイプとして、未使用または使用後の樹脂パイプを所定時間蒸気養生槽内に搬入し高温養生した後取り出し、常温近傍迄温度降下させて樹脂パイプを所定寸法に縮径させた後、前記第１工程に用いる、
ことを特徴とする中空部を有するコンクリート製品の製造方法。A method for producing a concrete product having a hollow portion such as a culvert block, a beam, a floor slab block, a retaining wall block ,
The first step is the concrete products manufacturing mold, close the resin pipe was attached to a predetermined position concrete products manufacturing mold of a predetermined shape and dimensions as the core member to form a hollow portion of a predetermined shape and size,
The second step, have a row compaction was charged with concrete,
The third step performs steam curing at a predetermined temperature for a predetermined time in a steam curing tank ,
In the fourth step, after a predetermined time, the concrete product manufacturing form is taken out of the steam curing tank, the concrete product manufacturing form is opened, and the concrete product is demolded with the resin pipe as the core member attached .
The fifth step is to cool the resin pipe by naturally cooling the concrete product to near room temperature, or forcibly cooling the resin pipe by water cooling, air cooling, etc., and reducing the diameter of the resin pipe to a predetermined shape by temperature drop. In the method for producing a concrete product having a hollow part that is removed from the molded hollow part and used again as a core member ,
As the resin pipe, an unused or used resin pipe is taken into a steam curing tank for a predetermined time, taken out after being cured at a high temperature, reduced in temperature to near normal temperature, and the resin pipe is reduced in diameter to a predetermined size, and then the first pipe is used. Used in one step,
A method for producing a concrete product having a hollow portion. 暗渠ブロック、梁、床版ブロック、擁壁ブロック等中空部を有するコンクリート製品の製造方法であって、A method for producing a concrete product having a hollow portion such as a culvert block, a beam, a floor slab block, a retaining wall block,
第１工程は、前記コンクリート製品製造用型枠に、所定形状寸法の中空部を形成する中子部材として所定形状寸法の樹脂パイプを所定位置に装着してコンクリート製品製造用型枠を閉じ、In the first step, a concrete product manufacturing mold is closed at a predetermined position as a core member for forming a hollow portion of a predetermined shape on the concrete product manufacturing mold, and the concrete product manufacturing mold is closed.
第２工程は、コンクリートを投入し締め固めを行い、In the second step, concrete is charged and compacted,
第３工程は、蒸気養生槽内で所定時間所定温度の蒸気養生を行い、The third step performs steam curing at a predetermined temperature for a predetermined time in a steam curing tank,
第４工程は、所定時間後、コンクリート製品製造用型枠を蒸気養生槽内から取り出しコンクリート製品製造用型枠を開き、中子部材である樹脂パイプを装着したままコンクリート製品を脱型し、In the fourth step, after a predetermined time, the concrete product manufacturing form is taken out of the steam curing tank, the concrete product manufacturing form is opened, and the concrete product is demolded with the resin pipe as the core member attached.
第５工程は、コンクリート製品の温度を常温近傍まで自然冷却させることで樹脂パイプを冷却するか、水冷や空冷等により樹脂パイプを強制冷却させ、温度降下により縮径した樹脂パイプを所定形状寸法に成形された中空部内から抜去し、再度中子部材として使用する中空部を有するコンクリート製品の製造方法において、The fifth step is to cool the resin pipe by naturally cooling the concrete product to near room temperature, or forcibly cooling the resin pipe by water cooling, air cooling, etc., and reducing the diameter of the resin pipe to a predetermined shape by temperature drop. In the method for producing a concrete product having a hollow part that is removed from the molded hollow part and used again as a core member,
前記樹脂パイプとして、未使用または使用後の樹脂パイプを全長或いは全長と外周面の一部または全面を拘束して所定時間蒸気養生槽内に搬入し高温養生した後取り出し、常温近傍迄温度降下させて樹脂パイプを所定寸法に縮径させた後、前記第１工程に用いる、As the resin pipe, the unused or used resin pipe is taken into the steam curing tank for a predetermined time with the entire length or part of the entire length and the outer peripheral surface being restrained, taken out after high temperature curing, and the temperature is lowered to near room temperature. After reducing the diameter of the resin pipe to a predetermined dimension, used in the first step,
ことを特徴とする中空部を有するコンクリート製品の製造方法。A method for producing a concrete product having a hollow portion. コンクリート製品製造用型枠に、中子部材となる樹脂パイプを装着する場合に樹脂パイプの端部を内側或いは外側または内側と外側から拘束して支持する、ことを特徴とする請求項１または２に記載の中空部を有するコンクリート製品の製造方法。3. A resin pipe serving as a core member is attached to a concrete product manufacturing form, and the end of the resin pipe is restrained and supported from the inside or outside or inside and outside. The manufacturing method of the concrete product which has a hollow part as described in 2. 前記第１工程において、製造用型枠の所定位置に樹脂パイプの両端部を密閉せずに全長を拘束して装着する、ことを特徴とする請求項１乃至３いずれか記載の中空部を有するコンクリート製品の製造方法。The hollow part according to any one of claims 1 to 3, wherein in the first step, the entire length of the resin pipe is constrained and attached to a predetermined position of the manufacturing formwork without sealing the both ends. A method for manufacturing concrete products.
JP2002027605A 2002-02-05 2002-02-05 Method for producing a concrete product having a hollow part Expired - Fee Related JP4148683B2 (en)

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