JPH0316883B2 - - Google Patents
Info
- Publication number
- JPH0316883B2 JPH0316883B2 JP60038219A JP3821985A JPH0316883B2 JP H0316883 B2 JPH0316883 B2 JP H0316883B2 JP 60038219 A JP60038219 A JP 60038219A JP 3821985 A JP3821985 A JP 3821985A JP H0316883 B2 JPH0316883 B2 JP H0316883B2
- Authority
- JP
- Japan
- Prior art keywords
- concrete
- formwork
- pipe
- reinforcing material
- fibrous reinforcing
- 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.)
- Expired - Lifetime
Links
Landscapes
- Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
Description
ａ 産業上の利用分野
本発明は、遠心力コンクリート製品の製造方法
に関する。
ｂ 従来の技術
従来、ヒユーム管などの遠心力コンクリート製
品の管体中に、鋼繊維などの繊維状補強材を混入
して管体の耐力を補強することが行われている。
該繊維状補強材を遠心力コンクリート製品の管
体中に混入する方法としては、
(イ) コンクリートを混練する際に、繊維状補強材
を混合し、その混合物を型枠内に投入して成形
する方法（Pre−Mix法）、
(ロ) 型枠内に所定量のコンクリートを投入したの
ち、該コンクリートが未固化のうちに、ベルト
コンベア等を用いて、繊維状補強材を型枠内に
投入して成形し、遠心力によつて管体中に該繊
維状補強材を混入する方法、
などが行われている。
ｃ 発明が解決しようとする問題点
しかし、上記(イ)の方法では、コンクリートの混
練中に繊維状補強材が凝集してフアイバーボール
が形成されるため、管体中に該補強材が不均一に
分布する結果となる。しかも、混入率がコンクリ
ートの容積に対して最大２％程度にとどまるた
め、管体耐力の補強効果が小さい。
また(ロ)の方法では、繊維状補強材を投入する際
に、該繊維状補強材が重なり合つて未固化のコン
クリート表面に落下し、コンクリートと混合しな
い繊維状補強材のみからなる層が管壁内に形成さ
れ、補強効果が半減する。しかもコンクリートと
繊維状補強材を別個に投入するため、管体の成形
に長時間を要する、などの問題があつた。
ｄ 問題点を解決するための手段
本発明は、上記問題点を解決するために、横置
きして回転する型枠内にコンクリートまたはモル
タルを投入すると同時に、これに並行して繊維状
補強材を先端が型枠内周面に近接し、かつ型枠の
回転方向に開口するように曲折された圧送管を用
いて前記投入されるコンクリートまたはモルタル
内に打込むことを特徴とする遠心力コンクリート
製品の製造方法を提供するものである。
上記繊維状補強材は、通常、使用されるもので
よく、特に制限されないが、例えばテツサ、アン
ダカツトフアイバー、シンコーフアイバーなどの
鋼繊維、耐アルカリ性のガラス短繊維、炭素繊
維、ポリアミド繊維、または有機質短繊維などを
挙げることができる。該繊維状補強材の太さ、長
さ、形状等は、繊維状補強材の種類、管体の所要
強度等に応じて適宜決定することができる。例え
ば、鋼繊維の場合、換算直径0.3〜0.8mm、長さ10
〜60mmのものを使用することができる。
また、上記繊維状補強材の型枠内への圧送管に
よる打込みは、コンクリートの投入と同時並行的
に、管体の円周方向に繊維状補強材が配列するよ
うに、先端が型枠内周面に近接し、かつ型枠の回
転方向に開口部を有するように曲折された圧送管
を用いて行われる。該圧送管は、繊維状補強材の
供給源と連通している。
上記曲折部および開口部の形状、曲折角度等
は、投入される繊維状補強材の種類、形状等に応
じて適宜決定される。
上記圧送管における圧送空気は、上記開口部に
おける圧送空気圧が、３〜６Kg／cm2の範囲になる
ように調節するのが望ましい。
また、上記繊維状補強材は、管体の全層にわた
つて投入して管体全体の耐力を補強することがで
きるが、さらに、遠心力コンクリート製品の用途
に応じて管体の一部分に該繊維状補強材を分布せ
しめ、その部分の耐力を特に補強することもでき
る。例えば、管壁の内層のみに繊維状補強材を分
布せしめて、該内層を補強することができる。ま
た管壁に、中間層を介してその内層と外層のみに
繊維状補強材を分布せしめ、外層および内層を補
強することもできる。
以下、図示の実施例を参照して、本発明を詳細
に説明する。
実施例 １
第１図は、本発明方法により、管壁内層のモル
タル層内に鋼繊維を分布させた内径600mm、管肉
厚50mm、長さ1000mmの遠心力コンクリート管を製
造する装置を示す。図中、１は遠心力成形機、２
は型枠、３はコンクリート供給装置、４は鋼繊維
供給装置、５は鋼繊維供給装置に連設した鋼繊維
圧送管、６はキユアリングボツクスを示す。
まず、遠心力成形機１内に型枠２を横置きし、
該型枠２内に補強用鉄筋７（管体に対するらせん
筋の鉄筋比1.5％）を配設する。
次に、型枠２をモーター８および該モーター８
に連動する駆動部９によつて回転させながら、ベ
ルトコンベアー１０を介してコンクリート供給装
置３から、下記組成のコンクリートを型枠２内に
供給装置を等速で前後進させながら型枠２の全長
にわたり投入し、肉厚40mmの管壁外層を形成す
る。
砂 率 40％
水 比 38％
セメント量 550Kg／m3
減水剤 5.5Kg／m3
次いで、下記組成のモルタルをコンクリート供
給装置３より、ベルトコンベアー１０を解して型
枠２内投入するとともに、
砂 比 1.0％
水 比 38％
減水剤 1.2％
換算直径0.6mm、長さ30mmの鋼繊維（神戸製鋼
(株)製の切削フアイバー）１１を同時並行的に鋼繊
維供給装置４から圧送管５を通り、圧送空気１３
により該圧送管５の端部に設けた曲折部１４の先
端開口部１５から型枠２内へ打込む。該先端開口
部１５からの鋼繊維１０の投入は、第２図Ａおよ
びＢに示すように、該鋼繊維１０が可及的に遠心
力コンクリート管の管壁の内周方向に配列される
ように行われる。
上記内外層の形成後、常法によりキユアリング
ボツクス６内において締め固め、養生、硬化を行
なつて、第３図のように、補強用鉄筋６を埋設し
た管壁外層１６と、鋼繊維１０が均一に分布した
管壁内層たるモルタル層１７を有する遠心力コン
クリート管を得る。
次に、鋼繊維の投入量を変えることにより、モ
ルタル内層（10mm厚）に対する容積比を変えて成
形した遠心力コンクリート管（実施例）、および
鋼繊維を従来方法と同様にベルトコンベアーによ
り撒布、投入して成形した遠心力コンクリート管
（比較例）について、それぞれ外圧試験を行つた。
その結果を表１に示す。
a. Industrial Application Field The present invention relates to a method for manufacturing centrifugal concrete products. b. Prior Art Conventionally, fibrous reinforcing materials such as steel fibers have been mixed into the pipe bodies of centrifugal concrete products such as humid pipes to reinforce the yield strength of the pipe bodies. The method of mixing the fibrous reinforcing material into the pipe body of a centrifugal concrete product is as follows: (a) When mixing concrete, fibrous reinforcing material is mixed, and the mixture is poured into a formwork and formed. (Pre-Mix method), (b) After pouring a specified amount of concrete into the formwork, and while the concrete is still unsolidified, use a belt conveyor, etc. to add fibrous reinforcing material into the formwork. A method is used in which the fibrous reinforcing material is mixed into the tube by centrifugal force. c Problems to be solved by the invention However, in the method (a) above, the fibrous reinforcing material aggregates to form fiber balls during mixing of concrete, so the reinforcing material is spread unevenly in the tube. This results in a distribution of . Moreover, since the mixing ratio is limited to a maximum of about 2% of the concrete volume, the effect of reinforcing the tube strength is small. Furthermore, in method (b), when the fibrous reinforcing material is introduced, the fibrous reinforcing material overlaps and falls onto the unsolidified concrete surface, creating a layer consisting only of the fibrous reinforcing material that does not mix with the concrete. Formed within the wall, the reinforcing effect is halved. Moreover, since the concrete and the fibrous reinforcing material were added separately, there were problems such as the long time it took to form the tube. d Means for Solving the Problems In order to solve the above problems, the present invention, in order to solve the above problems, introduces concrete or mortar into a formwork that is placed horizontally and rotates, and at the same time, a fibrous reinforcing material is placed in parallel with this. A centrifugal concrete product characterized in that it is poured into the concrete or mortar to be poured using a pressure feed pipe bent so that its tip is close to the inner circumferential surface of the formwork and opens in the rotational direction of the formwork. The present invention provides a method for manufacturing. The above-mentioned fibrous reinforcing material may be one that is normally used, and is not particularly limited, but includes, for example, steel fibers such as Tetsusa, undercut fibers, and Shinko fibers, alkali-resistant short glass fibers, carbon fibers, polyamide fibers, or organic materials. Examples include short fibers. The thickness, length, shape, etc. of the fibrous reinforcing material can be appropriately determined depending on the type of fibrous reinforcing material, the required strength of the tube, etc. For example, in the case of steel fiber, the equivalent diameter is 0.3 to 0.8 mm and the length is 10
~60mm can be used. In addition, when pouring the above-mentioned fibrous reinforcing material into the formwork using a pressure-feeding pipe, at the same time as concrete is being poured, the fibrous reinforcing material is arranged in the circumferential direction of the pipe body, so that the tip of the fibrous reinforcing material is placed inside the formwork. This is carried out using a pressure feeding tube that is bent so as to be close to the circumferential surface and has an opening in the direction of rotation of the formwork. The pumping tube communicates with a source of fibrous reinforcement. The shapes, bending angles, etc. of the bent portions and openings are appropriately determined depending on the type, shape, etc. of the fibrous reinforcing material to be introduced. The pressurized air in the pressurized pipe is desirably adjusted so that the pressurized air pressure at the opening is in the range of 3 to 6 kg/cm 2 . In addition, the above-mentioned fibrous reinforcing material can be applied to all layers of the pipe to reinforce the strength of the entire pipe, but depending on the application of the centrifugal concrete product, it may be applied to a portion of the pipe. It is also possible to distribute fibrous reinforcing material to particularly strengthen the bearing strength of the area. For example, the fibrous reinforcing material can be distributed only in the inner layer of the tube wall to reinforce the inner layer. It is also possible to distribute the fibrous reinforcing material only on the inner and outer layers of the pipe wall via an intermediate layer, thereby reinforcing the outer and inner layers. Hereinafter, the present invention will be explained in detail with reference to illustrated embodiments. Example 1 FIG. 1 shows an apparatus for manufacturing a centrifugal concrete pipe having an inner diameter of 600 mm, a pipe wall thickness of 50 mm, and a length of 1000 mm, in which steel fibers are distributed in the mortar layer of the inner layer of the pipe wall, by the method of the present invention. In the figure, 1 is a centrifugal force forming machine, 2
3 is a formwork, 3 is a concrete supply device, 4 is a steel fiber feed device, 5 is a steel fiber pressure pipe connected to the steel fiber feed device, and 6 is a curing box. First, the formwork 2 is placed horizontally in the centrifugal force forming machine 1,
Reinforcing reinforcing bars 7 (reinforcement ratio of spiral bars to the pipe body: 1.5%) are arranged within the formwork 2. Next, the formwork 2 is connected to the motor 8 and the motor 8
Concrete of the following composition is fed into the formwork 2 from the concrete feeder 3 via the belt conveyor 10 while being rotated by the drive unit 9 that is linked to the drive unit 9. to form an outer layer of the tube wall with a wall thickness of 40 mm. Sand ratio 40% Water ratio 38% Cement amount 550Kg/m 3Water reducer 5.5Kg/m 3Next , mortar with the following composition is fed into the formwork 2 from the concrete supply device 3 via the belt conveyor 10, and the sand Ratio 1.0% Water Ratio 38% Water reducing agent 1.2% Steel fiber with converted diameter 0.6 mm and length 30 mm (Kobe Steel
Co., Ltd.'s cutting fiber) 11 is simultaneously passed from the steel fiber supply device 4 through the pressure pipe 5, and the pressurized air 13
The pressure feed pipe 5 is driven into the formwork 2 through the tip opening 15 of the bent portion 14 provided at the end thereof. The steel fibers 10 are introduced through the tip opening 15 so that the steel fibers 10 are arranged as much as possible in the inner circumferential direction of the pipe wall of the centrifugal concrete pipe, as shown in FIGS. 2A and B. It will be held in After forming the above-mentioned inner and outer layers, compaction, curing, and hardening are performed in the curing box 6 by conventional methods, and as shown in FIG. A centrifugal concrete pipe is obtained which has a mortar layer 17 as an inner layer of the pipe wall in which mortar is uniformly distributed. Next, by changing the amount of steel fiber input, centrifugal concrete pipes (example) were formed with different volume ratios to the mortar inner layer (10 mm thickness), and the steel fibers were spread using a belt conveyor as in the conventional method. External pressure tests were conducted on each of the centrifugal concrete pipes (comparative example) that were poured and formed. The results are shown in Table 1.
【表】
実施例 ２
下記組成のコンクリートを使用し、
砂 率 60％
水 比 38％
セメント量 550Kg／m3
CSA 60Kg／m3
減水剤 1.2％
管壁全層にわたつて、鋼繊維を分布させた他は
実施例１と同様にして、管壁内に補強用鉄筋（管
体に対するらせん筋の鉄筋比1.5）を配設した内
径600mm、管肉厚50mm、長さ1000mmを遠心力コン
クリート管を成形した。その遠心力コンクリート
管について外圧試験を行つた。その結果を表−２
に示す。[Table] Example 2 Using concrete with the following composition, sand ratio 60% water ratio 38% cement amount 550Kg/m 3 CSA 60Kg/m 3 water reducer 1.2% steel fibers were distributed over the entire pipe wall thickness. Other than that, in the same manner as in Example 1, a centrifugal concrete pipe with an inner diameter of 600 mm, a pipe wall thickness of 50 mm, and a length of 1000 mm was constructed with reinforcing reinforcing bars (ratio of spiral bars to pipe body: 1.5) inside the pipe wall. Molded. External pressure tests were conducted on the centrifugal concrete pipe. Table 2 shows the results.
Shown below.
【表】【table】
【表】
ｅ 発明の効果
以上のように、本発明方法によれば、コンクリ
ートまたはモルタルと繊維状補強材とが、同時に
投入されるため、管体の成形時間が大幅に短縮さ
れる。また圧送管を用いた打込み投入のため、繊
維状補強材同志が重なり合うことなく、均等に分
布した状態で、しかも、圧送圧力を変更すること
により、種々の繊維状補強材の使用が可能とな
る。また、圧送管の先端は、型枠内周面に近接
し、かつ型枠の回転方向に開口するように曲折さ
れているため、管体の体力上最も効果的な管周方
向に繊維収縮補強材を配列することができ、管体
体力を大幅に向上させることができる。[Table] e Effects of the Invention As described above, according to the method of the present invention, since concrete or mortar and fibrous reinforcing material are added at the same time, the time for forming the pipe body is significantly shortened. In addition, since the fibrous reinforcing materials are inserted using a pressure-feeding tube, they are evenly distributed without overlapping each other, and by changing the pressure of the fibrous reinforcing materials, it is possible to use a variety of fibrous reinforcing materials. . In addition, the tip of the pressure pipe is close to the inner peripheral surface of the formwork and is bent to open in the rotational direction of the formwork, so fiber shrinkage reinforcement is applied in the circumferential direction, which is most effective for the physical strength of the pipe body. The material can be arranged in an array, and the physical strength of the tube body can be greatly improved.
第１図は、本発明方法によつて遠心力コンクリ
ート管を製造する成形装置を示す概念図、第２図
Ａはその要部拡大横断面図、第２図Ｂは縦断面図
を示し、第３図は本発明方法によつて成形された
遠心力コンクリート管の一実施例を示す断面図で
ある。
１……遠心力成形機、２……型枠、３……コン
クリート供給装置、４……鋼繊維供給装置、５…
…圧送管、６……キユアリングボツクス、７……
補強用鉄筋、８……モーター、９駆動部、１０…
…ベルトコンベアー、１１……鋼繊維、１３……
圧送空気、１４……曲折部、１５……先端開口
部、１６……管壁外層、１７……モルタル層。
FIG. 1 is a conceptual diagram showing a forming apparatus for manufacturing centrifugal concrete pipes by the method of the present invention, FIG. 2A is an enlarged cross-sectional view of the main part thereof, FIG. FIG. 3 is a sectional view showing an example of a centrifugal concrete pipe formed by the method of the present invention. 1...Centrifugal force forming machine, 2...Formwork, 3...Concrete supply device, 4...Steel fiber supply device, 5...
...Pressure pipe, 6... Curing box, 7...
Reinforcing reinforcing bar, 8...Motor, 9 Drive unit, 10...
...Belt conveyor, 11...Steel fiber, 13...
Pressurized air, 14...Bending portion, 15...Tip opening, 16...Tube wall outer layer, 17...Mortar layer.
Claims (1)
たはモルタルを投入すると同時に、これに並行し
て繊維状補強材を先端が型枠内周面に近接し、か
つ型枠の回転方向に開口するように曲折された圧
送管を用いて前記投入されるコンクリートまたは
モルタル内に打込むことを特徴とする遠心力コン
クリート製品の製造方法。1. Concrete or mortar is poured into a horizontally rotating formwork, and at the same time, in parallel with this, the fibrous reinforcing material is placed so that its tip is close to the inner peripheral surface of the formwork and opens in the direction of rotation of the formwork. A method for manufacturing a centrifugal concrete product, which comprises pouring into the concrete or mortar using a pressure feeding pipe bent in the following manner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3821985A JPS61195806A (en) | 1985-02-27 | 1985-02-27 | Manufacture of centrifugal-force concrete product |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3821985A JPS61195806A (en) | 1985-02-27 | 1985-02-27 | Manufacture of centrifugal-force concrete product |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS61195806A JPS61195806A (en) | 1986-08-30 |
| JPH0316883B2 true JPH0316883B2 (en) | 1991-03-06 |
Family
ID=12519191
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3821985A Granted JPS61195806A (en) | 1985-02-27 | 1985-02-27 | Manufacture of centrifugal-force concrete product |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS61195806A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0761646B2 (en) * | 1988-06-27 | 1995-07-05 | 東海コンクリート工業株式会社 | Centrifugal molding of fiber reinforced concrete products |
| JP2023146179A (en) * | 2022-03-29 | 2023-10-12 | 日本ヒューム株式会社 | Manufacturing method of cylindrical structure |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5939289B2 (en) * | 1975-01-08 | 1984-09-21 | ハネダコンクリ−トコウギヨウ カブシキガイシヤ | Manufacturing method of glass fiber piece reinforced concrete pipe |
| JPS51116815A (en) * | 1975-04-04 | 1976-10-14 | Nippon Yakin Kogyo Co Ltd | Method of reinforcing concrete with fibres |
| JPS5844624B2 (en) * | 1976-02-26 | 1983-10-04 | 東洋紡績株式会社 | Manufacturing method for artificial fiber reinforced cement products |
| JPS52144026A (en) * | 1976-05-26 | 1977-12-01 | Teikoku Hiyuumukan Kk | Machine for orientation and dispersion of fibres |
-
1985
- 1985-02-27 JP JP3821985A patent/JPS61195806A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS61195806A (en) | 1986-08-30 |
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