JPH0564277B2 - - Google Patents
Info
- Publication number
- JPH0564277B2 JPH0564277B2 JP60295342A JP29534285A JPH0564277B2 JP H0564277 B2 JPH0564277 B2 JP H0564277B2 JP 60295342 A JP60295342 A JP 60295342A JP 29534285 A JP29534285 A JP 29534285A JP H0564277 B2 JPH0564277 B2 JP H0564277B2
- Authority
- JP
- Japan
- Prior art keywords
- layer
- concrete
- soft
- thickness
- inner layer
- 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 - Fee Related
Links
- 239000002184 metal Substances 0.000 claims description 10
- 229910052751 metal Inorganic materials 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 8
- 229920003002 synthetic resin Polymers 0.000 claims description 6
- 239000000057 synthetic resin Substances 0.000 claims description 6
- 239000012784 inorganic fiber Substances 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- 239000007779 soft material Substances 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 8
- 239000000835 fiber Substances 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 4
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 230000003014 reinforcing effect Effects 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 229910000808 amorphous metal alloy Inorganic materials 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003822 epoxy resin Substances 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 239000008235 industrial water Substances 0.000 description 1
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229920000647 polyepoxide Polymers 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 229910001256 stainless steel alloy Inorganic materials 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 229920006337 unsaturated polyester resin Polymers 0.000 description 1
Description
ａ 産業上の利用分野
上、下水道、工業用水道および農業用水道など
の管路に用いるコンクリート管に関する。
ｂ 従来の技術
従来、振動製法または遠心力製法によるコンク
リート管は、管厚の増大、膨張コンクリートを用
いて内蔵鉄筋による応力の導入、管壁コンクリー
ト層内に繊維を配列するなどの手段で管体のひび
割れ耐力を補強する方法などが行なわれている。
ｃ 発明が解決しようとする問題点
コンクリートは外力による変形でひび割れが発
生するときの引張耐力は20〜30Kg／cm2の範囲であ
り、管壁コンクリート層に応力を導入したとして
もその導入応力は50Kg／cm2、繊維を配列しても30
Kg／cm2前後増加する程度なので、上記の方法では
内、外圧等の外力に対して大きな補強効果を期待
することができない。
ｄ 問題点を解決するための手段
本発明は、上記実情に鑑み、外側にコンクリー
ト管の主体となる層厚のコンクリート層を備え、
金属又は合成樹脂と無機質繊維を主材とする材料
で内層を構成し、該内層と前記コンクリート層と
の間に軟質材料による軟質層を設け、該軟質層の
厚さを内圧による内層の膨み量に相当する厚さよ
りも厚くし、内外圧に対する内層の高引張耐力を
有効に利用できるコンクリート管を提供するもの
である。
以下、本発明に係わるコンクリートについて、
添附図面を参照しながら詳細に説明する。
コンクリート管は第１図および第２図に示され
るように、コンクリート層１、軟質材料による層
２およびFRP層３によつて構成されており、そ
の製法は通常の遠心力製法によつて成形したの
ち、常圧蒸気養生または自然養生する。
内層に金属を用いた場合には、コンクリート層
と軟質層を成形したのち、その内面に薄肉の金属
層を嵌着する。
コンクリート層１には外圧荷重に対する管体の
耐力を向上せしめるために通常の鉄筋篭を配置し
たり、CAS系や石炭系などの膨張材を混入し、
または無機質類を配列するようにしても良い。
軟質層２はその材料として、例えば軟質のゴ
ム、樹脂などを使用し、金属層は、その材料とし
て、例えばステンレス鋼、アモルフアス合金など
を用いることができる。
FRP層３は合成樹脂として例えば、不飽和ポ
リエステル樹脂、エポキシ樹脂、フエノール樹脂
などの熱硬化性樹脂を用い、無機質繊維として例
えば、ガラス繊維、カーボン繊維、鋼繊維その他
の繊維と増量材として、例えば硅砂、炭酸カルシ
ウム、石粉などを用いることができる。
更に、FRP層３の厚さT3は引張弾性係数が７
〜10×104Kgｆ／cm2の範囲で、しかも内水圧によ
るFRPの膨み量が３〜20mmの範囲にあるように
設定されているのが好ましい。このような値に設
定したのは、３mm以下の膨み量にするとFRP層
の厚さが不経済な厚さとなり、20mmを越えると成
形作業が難しくなるためである。軟質層の厚さ
T2はFRP層の内水圧による膨み量に相当する厚
さの1.2〜1.5倍の厚さとする。これは、内水圧に
よつてFRP層が膨らんでもコンクリート層に引
張力が作用しないようにするためである。
このようにして構成されたコンクリート管は内
水圧が作用した場合に、その引張力は高引張耐力
の金属層またはFRP層が受け持ち、更に内水圧
によつてFRP層に膨みが生じても軟質層で緩衝
されるのでコンクリート層には引張力が作用しな
い。従つて、管体にはひび割れが生じない。ま
た、外圧が作用した場合でも、曲げモーメントが
最大となる内層には高引張耐力の金属層又は
FRP層が構成されているので、ひび割れ発生の
心配はなく、管側外面では内層の0.572に相当す
る外力しか作用しないので高耐力が期待される。
ｅ 実施例
内径600mm、長さ1000mmで管壁各層厚の異なる
本発明品を製作し、材令14日で内水圧試験を行な
つたところ下記のような結果が得られた。
a. Industrial Application Fields Concerning concrete pipes used for pipes such as water supply, sewerage, industrial water supply, and agricultural water supply. b. Conventional technology Conventionally, concrete pipes made using the vibration manufacturing method or centrifugal force manufacturing method were made by increasing the pipe thickness, using expanded concrete to introduce stress through built-in reinforcing bars, or arranging fibers within the concrete layer of the pipe wall. Methods are being used to strengthen the crack resistance of steel. c Problems to be solved by the invention The tensile strength of concrete when cracking occurs due to deformation due to external force is in the range of 20 to 30 kg/ cm2 , and even if stress is introduced into the pipe wall concrete layer, the introduced stress will be 50Kg/cm 2 , 30 even if the fibers are arranged
Since the increase is only around Kg/cm 2 , the above method cannot be expected to have a large reinforcing effect against external forces such as internal and external pressure. d Means for Solving the Problems In view of the above circumstances, the present invention includes a concrete layer having a thickness that is the main body of the concrete pipe on the outside,
The inner layer is made of a material mainly composed of metal or synthetic resin and inorganic fiber, and a soft layer made of a soft material is provided between the inner layer and the concrete layer, and the thickness of the soft layer is determined by the swelling of the inner layer due to internal pressure. The purpose of the present invention is to provide a concrete pipe that is made thicker than the thickness corresponding to the amount of the concrete pipe and can effectively utilize the high tensile strength of the inner layer against internal and external pressure. Below, regarding the concrete related to the present invention,
A detailed description will be given with reference to the accompanying drawings. As shown in Figures 1 and 2, the concrete pipe is composed of a concrete layer 1, a soft material layer 2, and an FRP layer 3, and its manufacturing method is a conventional centrifugal force manufacturing method. Afterwards, it is subjected to atmospheric pressure steam curing or natural curing. When metal is used for the inner layer, a thin metal layer is fitted onto the inner surface of the concrete layer and soft layer after being formed. In order to improve the resistance of the pipe against external pressure loads, ordinary reinforcing cages are placed in the concrete layer 1, and expanding materials such as CAS and coal are mixed.
Alternatively, inorganic substances may be arranged. The material of the soft layer 2 may be, for example, soft rubber or resin, and the material of the metal layer may be, for example, stainless steel or amorphous alloy. The FRP layer 3 uses thermosetting resin such as unsaturated polyester resin, epoxy resin, and phenol resin as the synthetic resin, and uses inorganic fibers such as glass fiber, carbon fiber, steel fiber, and other fibers as the filler. Silica sand, calcium carbonate, stone powder, etc. can be used. Furthermore, the thickness T 3 of the FRP layer 3 has a tensile modulus of elasticity of 7.
It is preferable that the amount of expansion of the FRP due to the internal water pressure is set within the range of 3 to 20 mm. The reason for setting this value is that if the swelling amount is less than 3 mm, the thickness of the FRP layer becomes uneconomical, and if it exceeds 20 mm, the molding operation becomes difficult. Soft layer thickness
T 2 shall be 1.2 to 1.5 times the thickness corresponding to the amount of swelling of the FRP layer due to internal water pressure. This is to prevent tensile force from acting on the concrete layer even if the FRP layer swells due to internal water pressure. When a concrete pipe constructed in this way is subjected to internal water pressure, the tensile force is carried by the high tensile strength metal layer or FRP layer, and even if the FRP layer swells due to internal water pressure, it remains soft. No tensile force acts on the concrete layer because it is buffered by the layer. Therefore, no cracks occur in the tube. In addition, even when external pressure is applied, the inner layer where the bending moment is maximum is a metal layer with high tensile strength or
Since it is composed of an FRP layer, there is no need to worry about cracks occurring, and high yield strength is expected as only an external force equivalent to 0.572 of the inner layer acts on the outer surface of the tube. e.Example A product of the present invention having an inner diameter of 600 mm and a length of 1000 mm with different thicknesses for each layer of the pipe wall was manufactured, and an internal water pressure test was conducted at 14 days old, and the following results were obtained.
【表】
ｆ 発明の効果
以上説明したようにう本発明のコンクリート管
は、外側にコンクリート管の主体となる層厚のコ
ンクリート層を備え、金属又は合成樹脂と無機質
繊維を主材とする材料で内層を構成することによ
り、内圧が作用した場合の引張力を高引張耐力の
内層が受持つので、コンクリート層のひび割れ発
生を確実に回避でき、また、外圧が断面を円形か
ら偏平形状に変形させるように作用した場合、曲
げモーメントが最大になる内層を高引張耐力の金
属又は合成樹脂と無機質繊維を主材とする材料で
構成してあるので、内層がそれを受持ち、コンク
リート層にひび割れが発生しない。また、該内層
とコンクリート層との間に軟質材料による軟質層
を設け、該軟質層の厚さを内圧による内層の膨み
量に相当する厚さよりも厚くしたので、内圧によ
つて内層に膨らみが生じても軟質層によつて緩和
されてコンクリート層に引張力が作用せず、高耐
力を確保することができ、しかも常法による製法
で容易に造ることができることから経済性にも優
れている。[Table] f Effect of the invention As explained above, the concrete pipe of the present invention has a concrete layer on the outside with a thickness that is the main layer of the concrete pipe, and is made of a material mainly composed of metal or synthetic resin and inorganic fiber. By configuring the inner layer, the inner layer with high tensile strength takes over the tensile force when internal pressure is applied, so it is possible to reliably avoid the occurrence of cracks in the concrete layer, and the external pressure causes the cross section to change from a circular shape to a flat shape. If this occurs, the inner layer, where the bending moment is maximum, is made of a material mainly made of metal or synthetic resin with high tensile strength and inorganic fibers, so the inner layer takes charge of this and cracks occur in the concrete layer. do not. In addition, a soft layer made of a soft material was provided between the inner layer and the concrete layer, and the thickness of the soft layer was made thicker than the thickness corresponding to the amount of swelling of the inner layer due to internal pressure. Even if stress occurs, it is alleviated by the soft layer and no tensile force is applied to the concrete layer, ensuring high yield strength.Moreover, it is also excellent in economic efficiency as it can be easily manufactured using conventional methods. There is.
第１図は本発明によるコンクリート管の横断面
図、第２図は縦断面図である。
１……コンクリート層、２……軟質層、３……
金属またはFRP層。
FIG. 1 is a cross-sectional view of a concrete pipe according to the present invention, and FIG. 2 is a longitudinal cross-sectional view. 1... Concrete layer, 2... Soft layer, 3...
metal or FRP layer.
Claims (1)
ンクリート層を備え、金属又は合成樹脂と無機質
繊維を主材とする材料で内層を構成し、該内層と
前記コンクリート層との間に軟質材料による軟質
層を設け、該軟質層の厚さを内圧による内層の膨
み量に相当する厚さよりも厚くしたことを特徴と
するコンクリート管。 ２ 軟質層が軟質ゴム又は軟質合成樹脂から選定
した材料からなる特許請求の範囲第１項記載のコ
ンクリート管。[Scope of Claims] 1. A concrete layer having a thickness that corresponds to the main body of the concrete pipe is provided on the outside, and an inner layer is composed of a material mainly composed of metal or synthetic resin and inorganic fiber, and the inner layer and the concrete layer are A concrete pipe characterized in that a soft layer made of a soft material is provided between the pipes, and the thickness of the soft layer is greater than the thickness corresponding to the amount of swelling of the inner layer due to internal pressure. 2. The concrete pipe according to claim 1, wherein the soft layer is made of a material selected from soft rubber or soft synthetic resin.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60295342A JPS62155389A (en) | 1985-12-27 | 1985-12-27 | Concrete pipe |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP60295342A JPS62155389A (en) | 1985-12-27 | 1985-12-27 | Concrete pipe |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62155389A JPS62155389A (en) | 1987-07-10 |
| JPH0564277B2 true JPH0564277B2 (en) | 1993-09-14 |
Family
ID=17819372
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP60295342A Granted JPS62155389A (en) | 1985-12-27 | 1985-12-27 | Concrete pipe |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62155389A (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113894A (en) * | 1979-12-27 | 1981-09-08 | Spie Batignolles | Transporting pipeline for cold thermal fluid |
-
1985
- 1985-12-27 JP JP60295342A patent/JPS62155389A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56113894A (en) * | 1979-12-27 | 1981-09-08 | Spie Batignolles | Transporting pipeline for cold thermal fluid |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62155389A (en) | 1987-07-10 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |