JP2713650B2 - Manufacturing method of prestressed steel plate concrete pipe - Google Patents

Manufacturing method of prestressed steel plate concrete pipe

Info

Publication number
JP2713650B2
JP2713650B2 JP22647990A JP22647990A JP2713650B2 JP 2713650 B2 JP2713650 B2 JP 2713650B2 JP 22647990 A JP22647990 A JP 22647990A JP 22647990 A JP22647990 A JP 22647990A JP 2713650 B2 JP2713650 B2 JP 2713650B2
Authority
JP
Japan
Prior art keywords
concrete
steel pipe
pipe
steel
steel plate
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
Application number
JP22647990A
Other languages
Japanese (ja)
Other versions
JPH04110105A (en
Inventor
恒 関本
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Heavy Industries Ltd
Original Assignee
Mitsubishi Heavy Industries Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Mitsubishi Heavy Industries Ltd filed Critical Mitsubishi Heavy Industries Ltd
Priority to JP22647990A priority Critical patent/JP2713650B2/en
Publication of JPH04110105A publication Critical patent/JPH04110105A/en
Application granted granted Critical
Publication of JP2713650B2 publication Critical patent/JP2713650B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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  • Rigid Pipes And Flexible Pipes (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)

Description

【発明の詳細な説明】 (産業上の利用分野) 本発明は水圧鋼管、埋設管等の管路構成用各種プレス
トレスト鋼板コンクリート管の製造方法に係るものであ
る。
Description: TECHNICAL FIELD The present invention relates to a method for producing various prestressed steel plate concrete pipes for forming pipelines such as hydraulic steel pipes and buried pipes.

(従来の技術) 従来のプレストレストコンクリート製管の代表的製造
方法である遠心力締固め工法は第6図に示すように、一
双の半円筒形鋼製型枠(a)の相対するフランジ部間を
締付ボルト(b)で締結して円筒形型枠を組立て、同型
枠を遠心機上に架乗して回転せしめるとともに、鋼製型
枠(a)内に未硬化コンクリート(c)を投入して中空
管を遠心成型し、(第7図参照)コンクリート(c)の
硬化後、脱型し、コンクリート管の外側周方向にPC鋼材
(d)を緊張しながらコンクリート部に円周方向のプレ
ストレスを導入すると同時に、前記コンクリート部に管
軸方向に配設したPC鋼材(e)を緊張締結することによ
って前記コンクリート部に軸方向のプレスを導入するも
のである。
(Prior Art) As shown in FIG. 6, a centrifugal compaction method, which is a typical method for producing a prestressed concrete pipe, is shown in FIG. Is assembled with a tightening bolt (b) to assemble a cylindrical formwork, the formwork is mounted on a centrifuge and rotated, and unhardened concrete (c) is put into the steel formwork (a). Then, the hollow tube is centrifugally molded (see FIG. 7). After the concrete (c) is hardened, it is released from the mold. At the same time, the prestress is introduced, and at the same time, the PC steel material (e) disposed in the pipe axis direction is tensioned and fastened to the concrete section, thereby introducing an axial press into the concrete section.

(発明が解決しようとする課題) 前記従来のコンクリートの遠心力締固め方法は、鋼製
の型枠を遠心機の上に架乗して回転させることによっ
て、コンクリートを密実に締固めするものであって、中
空製品を製造する場合には効率がよく、コンクリート製
の表面が緻密で仕上りがよく、水セメント比の小さい高
強度のコンクリート製品を容易に製造することができる
等の利点がある。
(Problem to be Solved by the Invention) The conventional method for compacting centrifugal force of concrete involves compacting concrete concrete by mounting a steel formwork on a centrifuge and rotating it. Therefore, there is an advantage in that a hollow product is manufactured efficiently, the concrete surface is dense and the finish is good, and a high-strength concrete product having a small water-cement ratio can be easily manufactured.

しかしながら製造には細心の注意を要し、コンクリー
ト内部に鉄筋、あるいはプレストレス導入用のPC鋼材が
ある場合は骨材の分離を助長し易く、また型枠としてフ
ランジ接合型2分割型枠を使用しているので、フランジ
接合部からペーストが飛散し、内部に欠陥が残り易い。
更にコンクリートにクラツクが入ると水密性が低下する
等の欠点がある。
However, careful production is required. If there is a reinforcing bar or PC steel for prestressing inside the concrete, it is easy to promote the separation of the aggregate, and a flange-joined two-part form is used as the form. As a result, the paste is scattered from the flange joint, and defects are likely to remain inside.
In addition, there is a drawback in that the cracks in the concrete deteriorate the watertightness.

またコンクリート部に対するプレストレスの導入に際
しては、コンクリート硬化後、コンクリート内に配設さ
れたシースにPC鋼材を貫挿し、緊張ジヤツキ等によって
緊張、定着するとともに、前記シースにグラウテイング
するポストテンシヨン方式が採用されるため、部材点数
が多くなり、工数が多く、工期が長くなる等の問題点が
あった。
Also, when introducing prestress into the concrete part, after the concrete is hardened, a PC steel material is inserted into the sheath provided in the concrete, tensioned and settled by a tension jack, etc., and grouted to the sheath. Is adopted, there are problems such as an increase in the number of members, an increase in man-hours, and an increase in the construction period.

本発明は前記従来技術の有する問題点に鑑みて提案さ
れたもので、その目的とする処は、プレストレスが容易
に導入され、水密性が向上し、施工不良に基因する強度
低下が生起することのないプレスキヤスト鋼板コンクリ
ート管の製造方法を提供する点にある。
The present invention has been proposed in view of the problems of the prior art described above, and its purpose is to easily introduce prestress, improve watertightness, and cause a decrease in strength due to poor construction. It is an object of the present invention to provide a method for producing a press-cast steel plate concrete pipe without any problem.

(課題を解決するための手段) 前記の目的を達成するため、本発明に係るプレストレ
スト鋼板コンクリート管の製造方法によれば、内周面に
ずれ止め部材が取付けられた鋼管の内部に未硬化コンク
リートを投入し、同鋼管を回転せしめるとともに、同鋼
管自体を軸方向に機械的に引張り、前記コンクリートの
硬化後、前記鋼管に賦与された円周方向及び軸方向緊張
力を解放し、前記コンクリートにプレストレスを導入す
るものである。
(Means for Solving the Problems) In order to achieve the above object, according to the method for manufacturing a prestressed steel plate concrete pipe according to the present invention, unhardened concrete is provided inside a steel pipe having an inner peripheral surface provided with a slip-stop member. The steel pipe is rotated, and the steel pipe itself is mechanically pulled in the axial direction, and after the concrete is hardened, the circumferential and axial tension applied to the steel pipe is released, and the concrete is released. It introduces prestress.

(作用) 本発明によれば前記したように、内周面にずれ止め部
材が取付けられた鋼管内部に未硬化コンクリートを投入
し、同鋼管を回転せしめることによって、同鋼管内周面
にコンクリートがずれ止め部材を介して一体に圧着され
るので、外周鋼板の存在によって、内部コンクリートに
クラツクが発生しても水漏れ等が生起することがなく、
また従来のフランジ接合型2分割型枠を使用した場合に
おけるように、ペースト等の飛散による内部欠陥を生起
することがない。
(Operation) According to the present invention, as described above, concrete is put on the inner peripheral surface of the steel pipe by introducing unhardened concrete into the steel pipe having the slip stopper attached to the inner peripheral surface and rotating the steel pipe. Since it is integrally press-bonded via the slip stopper, the presence of the outer peripheral steel plate does not cause water leakage etc. even if cracks occur in the internal concrete,
Further, unlike the case of using the conventional flange-joined two-piece mold, internal defects due to scattering of the paste or the like do not occur.

またコンクリート部の内部には鉄筋等が配筋されてい
ないので、骨材の分離が少ない。
Further, since no reinforcing bars or the like are arranged inside the concrete portion, separation of aggregates is small.

更に本発明によれば前記未硬化コンクリートが投入さ
れた鋼管の回転に伴なう遠心力によって、コンクリート
が鋼管内周面に圧着され、円周方向に鋼管が拡開される
ものである。同時に管軸方向に亘って鋼管を機械的に引
張ることによって、鋼管自体は円周方向及び軸方向の両
方向に亘って緊張される。
Further, according to the present invention, the concrete is pressed against the inner peripheral surface of the steel pipe by centrifugal force accompanying the rotation of the steel pipe into which the uncured concrete is put, and the steel pipe is expanded in the circumferential direction. At the same time, the steel tube itself is tensioned in both the circumferential and axial directions by mechanically pulling the steel tube in the axial direction.

従って前記コンクリート硬化後、前記鋼管に対する円
周方向及び軸方向の緊張力を解放することによって、同
鋼管内周面に設けたずれ止め部材を介して前記コンクリ
ートに円周方向及び軸方向のプレストレスが導入され
る。
Therefore, after the concrete is hardened, the circumferential and axial tension on the steel pipe is released, so that the concrete is pre-stressed in the circumferential and axial directions through the slip stopper provided on the inner peripheral surface of the steel pipe. Is introduced.

(実施例) 以下本発明を図示の実施例について説明する。(Example) Hereinafter, the present invention will be described with reference to an illustrated example.

(1)は鋼管で、同鋼管(1)の内周面にずれ止め部
材としてのスタツドボルト(2)が植立されている。
(第1図及び第3図参照) 前記鋼管(1)の内部に未硬化のコンクリート(3)
を投入し、同鋼管(1)を遠心機によって回転させると
ともに、鋼管(1)自体に管軸方向の引張力Tを与える
(第2図及び第4図参照) 従って鋼管(1)内のコンクリート(3)は遠心力に
よって鋼管(1)の内周面に圧着され、スタツドボルト
(2)を介して同鋼管(1)とコンクリート(3)とが
一体化された中空の鋼板コンクリート管が成形されると
ともに、鋼管(1)はコンクリート(3)の遠心力によ
って半径方向に押し拡げられ、同時に前記引張力Tによ
って管軸方向に伸長される。
(1) is a steel pipe, and a stud bolt (2) as a stopper member is erected on the inner peripheral surface of the steel pipe (1).
(See FIGS. 1 and 3) Unhardened concrete (3) inside the steel pipe (1)
And the steel pipe (1) is rotated by a centrifuge, and a tensile force T is applied to the steel pipe (1) itself in the axial direction of the pipe (see FIGS. 2 and 4). (3) is pressed against the inner peripheral surface of the steel pipe (1) by centrifugal force, and a hollow steel plate concrete pipe in which the steel pipe (1) and the concrete (3) are integrated via a stud bolt (2) is formed. At the same time, the steel pipe (1) is expanded in the radial direction by the centrifugal force of the concrete (3), and is simultaneously expanded in the pipe axis direction by the tensile force T.

この状態を保持したままコンクリート(3)を硬化さ
せ、前記遠心力及び引張力を解放すると、鋼管(1)が
元の形に戻ろうとして半径方向及び軸方向に縮もうとす
る。この鋼管(1)の戻る力がコンクリート(3)に直
接、あるいはスタツドボルト(2)を介して伝わり、コ
ンクリート(3)に周方向及び軸方向の圧縮プレストレ
スが導入される。
When the concrete (3) is hardened while maintaining this state and the centrifugal force and the tensile force are released, the steel pipe (1) attempts to shrink in the radial and axial directions in an attempt to return to the original shape. The returning force of the steel pipe (1) is transmitted directly to the concrete (3) or via the stud bolt (2), and a circumferential and axial compressive prestress is introduced into the concrete (3).

第5図は鋼管(1)の引張装置を示し、鋼管(1)の
端部に溶接され、且つスタツドボルト(2)を介してコ
ンクリート(3)にも固定された端部金具(4)に締付
ボルト(5)を介して引張治具(6)か接合され、同引
張治具(6)と引張棒(7)先端部との間にローラ
(8)が介装されている。
FIG. 5 shows a tensioning device for the steel pipe (1), which is welded to the end of the steel pipe (1) and is fixed to the concrete (3) via stud bolts (2). A pulling jig (6) is joined via a tightening bolt (5), and a roller (8) is interposed between the pulling jig (6) and the tip of a pulling rod (7).

而して油圧ジヤツキ(図示せず)等によって引張棒
(7)を管軸方向に緊張すると、同引張棒(7)による
管軸方向の引張力Tはローラ(8)を介して鋼管(1)
とともに回転する引張治具(6)に伝達され、更に締付
ボルト(5)、端部金具(4)を介して鋼管(1)に伝
達されることによって、同鋼管(1)に緊張力が賦与さ
れる。
When the tension rod (7) is tensioned in the pipe axis direction by a hydraulic jack (not shown) or the like, the tension T in the pipe axis direction by the tension rod (7) is transmitted via the roller (8) to the steel pipe (1). )
The tensile force is transmitted to the steel pipe (1) by being transmitted to the tension jig (6) rotating together with the steel pipe (1) via the tightening bolt (5) and the end fitting (4). Granted.

(発明の効果) 本発明によれば前記したように、内周面にずれ止め部
材が取付けられた鋼管の内部に未硬化コンクリートを投
入し、同鋼管を回転せしめると同時に管軸方向に機械的
に引張り、この状態で前記コンクリートが硬化した後、
前記鋼管に対する円周方向及び軸方向緊張力を解放する
ことによって、コンクリート部に軸方向及び円周方向の
プレストレスが導入されたプレストレスト鋼板コンクリ
ート管が製作されるものであり、本発明によればこのよ
うに管外表面を覆う鋼管自体を緊張材として使用するこ
とによって、従来のプレストレストコンクリート管に比
してプレストレス導入のための機械部材点数が少なくて
済み、管製作と同時にプレストレスが導入されるので、
製作工期が短縮される。
(Effects of the Invention) According to the present invention, as described above, unhardened concrete is poured into a steel pipe having a slip prevention member attached to the inner peripheral surface, and the steel pipe is rotated, and at the same time, the mechanical pipe is mechanically moved in the pipe axis direction. After the concrete has hardened in this state,
By releasing the circumferential and axial tension on the steel pipe, a prestressed steel plate concrete pipe in which axial and circumferential prestress is introduced into the concrete part is manufactured, and according to the present invention, By using the steel pipe itself that covers the outer surface of the pipe as a tendon as described above, the number of mechanical members for introducing prestress is smaller than that of conventional prestressed concrete pipes, and prestress is introduced simultaneously with pipe production. So that
The production period is shortened.

また本発明の方法によれば、管外表面が鋼管で被覆さ
れているので、たとえ内部コンクリートにクラツクが発
生しても管内部の水等の外部への漏出、逆に管外部の水
の管内部への浸入が全くなく、水密性が飛躍的に向上す
る。
Further, according to the method of the present invention, since the outer surface of the pipe is covered with a steel pipe, even if cracks occur in the internal concrete, leakage of water inside the pipe to the outside, and conversely, water pipe outside the pipe. There is no penetration into the interior, and the watertightness is dramatically improved.

更に本発明の方法によれば、コンクリート管外表面に
一体に被覆された鋼管がコンクリート型枠を兼用し、且
つコンクリート内部に鉄筋、PC鋼材等の骨材の分離を助
長する構成材がないので、施工不良に起因する強度低下
が殆んどない。
Furthermore, according to the method of the present invention, the steel pipe integrally coated on the outer surface of the concrete pipe also serves as a concrete formwork, and there is no component inside the concrete that promotes the separation of aggregates such as reinforcing steel and PC steel. There is almost no reduction in strength due to poor construction.

【図面の簡単な説明】[Brief description of the drawings]

第1図及び第2図は本発明に係るプレストレスト鋼板コ
ンクリート管の製造方法の一実施例の工程を示す縦断正
面図、第3図及び第4図は夫々第1図並に第2図の縦断
側面図、第5図は鋼管の緊張装置を示す部分縦断正面
図、第6図乃至第8図は従来のプレストレストコンクリ
ート管の製造工程を示す縦断側面図、第9図は第8図の
縦断正面図である。 (1)……鋼管、(2)……スタツドボルト、(3)…
…コンクリート、(4)……端部金具、(6)引張治
具、(7)……引張棒。
1 and 2 are longitudinal sectional front views showing steps of one embodiment of a method for manufacturing a prestressed steel plate concrete pipe according to the present invention, and FIGS. 3 and 4 are longitudinal sectional views of FIG. 2 as well as FIG. FIG. 5 is a partial vertical front view showing a steel pipe tensioning device, FIGS. 6 to 8 are vertical cross-sectional side views showing a conventional prestressed concrete pipe manufacturing process, and FIG. 9 is a vertical front view of FIG. FIG. (1) ... steel pipe, (2) ... stud bolt, (3) ...
... concrete, (4) ... end fittings, (6) tension jig, (7) ... tension rod.

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項1】内周面にずれ止め部材が取付けられた鋼管
の内部に未硬化コンクリートを投入し、同鋼管を回転せ
しめるとともに、同鋼管自体を軸方向に機械的に引張
り、前記コンクリートの硬化後、前記鋼管に賦与された
円周方向及び軸方向緊張力を解放し、前記コンクリート
にプレストレスを導入することを特徴とするプレストレ
スト鋼板コンクリート管の製造方法。
1. An unhardened concrete is poured into a steel pipe having a slip stopper attached to an inner peripheral surface thereof, the steel pipe is rotated, and the steel pipe itself is mechanically pulled in an axial direction to harden the concrete. Thereafter, a circumferential and axial tension applied to the steel pipe is released to introduce prestress into the concrete, and a method for producing a prestressed steel plate concrete pipe is provided.
JP22647990A 1990-08-30 1990-08-30 Manufacturing method of prestressed steel plate concrete pipe Expired - Lifetime JP2713650B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22647990A JP2713650B2 (en) 1990-08-30 1990-08-30 Manufacturing method of prestressed steel plate concrete pipe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22647990A JP2713650B2 (en) 1990-08-30 1990-08-30 Manufacturing method of prestressed steel plate concrete pipe

Publications (2)

Publication Number Publication Date
JPH04110105A JPH04110105A (en) 1992-04-10
JP2713650B2 true JP2713650B2 (en) 1998-02-16

Family

ID=16845748

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22647990A Expired - Lifetime JP2713650B2 (en) 1990-08-30 1990-08-30 Manufacturing method of prestressed steel plate concrete pipe

Country Status (1)

Country Link
JP (1) JP2713650B2 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210144168A (en) * 2020-05-21 2021-11-30 고려대학교 산학협력단 Steel-concrete composite tank or floater and their fabrication method by using the internal pressure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102975283A (en) * 2012-12-17 2013-03-20 上海中技桩业股份有限公司 Forming method for ununiformly reinforcement-arranged precast pile

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20210144168A (en) * 2020-05-21 2021-11-30 고려대학교 산학협력단 Steel-concrete composite tank or floater and their fabrication method by using the internal pressure
KR102354839B1 (en) 2020-05-21 2022-01-24 고려대학교 산학협력단 Steel-concrete composite tank or floater and their fabrication method by using the internal pressure

Also Published As

Publication number Publication date
JPH04110105A (en) 1992-04-10

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