JP2003039522A - Method for producing unbonded pc steel strand - Google Patents
Method for producing unbonded pc steel strandInfo
- Publication number
- JP2003039522A JP2003039522A JP2001229767A JP2001229767A JP2003039522A JP 2003039522 A JP2003039522 A JP 2003039522A JP 2001229767 A JP2001229767 A JP 2001229767A JP 2001229767 A JP2001229767 A JP 2001229767A JP 2003039522 A JP2003039522 A JP 2003039522A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene sheath
- stranded wire
- unbonded
- steel
- sheath
- 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.)
- Granted
Links
Landscapes
- Reinforcement Elements For Buildings (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】この発明は、橋梁の桁、タン
ク等のコンクリート構造物にプレストレスを与えるケー
ブル、あるいは岩盤、法面等を補強するための地崩れ防
止用アンカーケーブルとして使用されるＰＣ鋼より線、
特に、定着長部においてセメントグラウトに対して高い
付着力を有し、かつ定着長部をセメントグラウトで固め
た後、緊張させる際に、自由長部において自由に伸びて
緊張力を付与しやすい、アンボンドＰＣ鋼より線に関す
るものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a PC used as a cable for prestressing concrete structures such as bridge girders and tanks, or as an anchor cable for preventing landslides for reinforcing rocks, slopes, etc. Stranded steel wire,
In particular, it has a high adhesive force to the cement grout in the fixing length portion, and when the fixing length portion is hardened with cement grout and then tensioned, it is easy to stretch and give tension in the free length portion, It relates to unbonded PC stranded wire.
【０００２】[0002]
【従来の技術】従来におけるアンボンドＰＣ鋼より線の
代表的なものは、図１に示すように、ＰＣ鋼より線１の
裸線表面にポリエチレンシース２を被覆し、ＰＣ鋼より
線１とポリエチレンシース２との間に、潤滑剤として防
食を兼ねたグリース３を充填している。2. Description of the Related Art A typical conventional unbonded PC stranded wire is a PC stranded wire 1 with a polyethylene sheath 2 covering the bare wire surface of the PC stranded wire 1 as shown in FIG. Between the sheath 2 and the sheath 2, grease 3 which also serves as a corrosion preventive is filled.
【０００３】かかるアンボンドＰＣ鋼より線は、ＰＣ鋼
より線１を裸線状態で、グリースボックス内を通過させ
ることにより、ＰＣ鋼より線１の裸線の表面にグリース
３を塗布し、その後、押し出しにより２００℃程度の加
熱されたポリエチレンシース２を被覆し、水冷するとい
う方法により製造されている。In such an unbonded PC stranded wire, the PC stranded wire 1 in a bare wire state is passed through a grease box to apply the grease 3 to the surface of the bare wire of the PC steel stranded wire 1, and thereafter, It is manufactured by a method of covering the polyethylene sheath 2 heated at about 200 ° C. by extrusion and cooling with water.
【０００４】ところが、ＰＣ鋼より線１とポリエチレン
シース２との間にグリース３を充填したアンボンドＰＣ
鋼より線は、橋梁、アンカー等の施工現場において、緊
張させる際に、ポリエチレンシース２を剥いで、グリー
ス３を除去しなければならず、作業性が非常に悪い。However, unbonded PC in which grease 3 is filled between the PC steel strand 1 and the polyethylene sheath 2.
The stranded steel wire is very inferior in workability because the polyethylene sheath 2 must be peeled off and the grease 3 must be removed when it is tensioned at a construction site such as a bridge or an anchor.
【０００５】また、アンカーとして使用する場合には、
図２に示すように、自由長部分と定着長部分の境界部分
を、止水剤やチューブ４によって止水する必要がある
が、上記構造のアンボンドＰＣ鋼より線の場合には、グ
リース３が油性であるため、止水剤やチューブ４との接
着性が悪く、止水性が不安定で、止水が不完全になると
いう問題がある。When used as an anchor,
As shown in FIG. 2, the boundary portion between the free length portion and the fixed length portion needs to be stopped by a waterproof agent or the tube 4, but in the case of the unbonded PC steel stranded wire having the above structure, the grease 3 Since it is oil-based, there is a problem that the water-stopping agent and the adhesion to the tube 4 are poor, the water-stopping is unstable, and the water-stopping is incomplete.
【０００６】このため、従来、ＰＣ鋼より線１とポリエ
チレンシース２との間にグリース３を充填しないで、Ｐ
Ｃ鋼より線１の外周にポリエチレンシース２を直接被
せ、ＰＣ鋼より線１の外周とポリエチレンシース２との
間に、所定のクリアランスを空けるようにしたアンボン
ドＰＣ鋼より線もある（特許第２８８８２３９号）。Therefore, conventionally, the grease 3 is not filled between the PC steel stranded wire 1 and the polyethylene sheath 2, and
There is also an unbonded PC stranded wire in which a polyethylene sheath 2 is directly covered on the outer circumference of the C steel stranded wire 1 so as to leave a predetermined clearance between the outer circumference of the PC stranded wire 1 and the polyethylene sheath 2 (Patent No. 2888239). issue).
【０００７】このＰＣ鋼より線１の外周とポリエチレン
シース２との間に、所定のクリアランスを空けるように
したアンボンドＰＣ鋼より線では、図３に示すようにＰ
Ｃ鋼より線１自体の防食を図るために、ＰＣ鋼より線１
自体の外周に、樹脂被膜５を設けている。[0007] In the unbonded PC stranded wire in which a predetermined clearance is provided between the outer periphery of the PC stranded wire 1 and the polyethylene sheath 2, as shown in FIG.
In order to prevent corrosion of C steel stranded wire 1 itself, PC steel stranded wire 1
A resin coating 5 is provided on the outer periphery of itself.
【０００８】[0008]
【発明が解決しようとする課題】ところが、ＰＣ鋼より
線１の外周とポリエチレンシース２との間に、所定のク
リアランスを空けるようにした図３に示す構造のアンボ
ンドＰＣ鋼より線を製造する場合、樹脂被膜５を形成し
たＰＣ鋼より線１の外周にポリエチレンシース２を被覆
するために、樹脂被膜５を形成したＰＣ鋼より線１をポ
リエチレンの押し出し機に供給すると、ＰＣ鋼より線１
の外面にグリース等の充填物が存在しないため、樹脂被
膜５を形成したＰＣ鋼より線１の外面に、図４に示すよ
うに、ポリエチレンシース２が接触状態で被覆され、樹
脂被膜５を形成したＰＣ鋼より線１とポリエチレンシー
ス２との間に所定のクリアランスが形成できないことが
ある。However, when manufacturing an unbonded PC steel wire having a structure shown in FIG. 3 in which a predetermined clearance is provided between the outer circumference of the PC steel wire 1 and the polyethylene sheath 2. In order to coat the polyethylene sheath 2 on the outer circumference of the PC steel stranded wire 1 having the resin coating 5 formed thereon, when the PC steel stranded wire 1 provided with the resin coating 5 is supplied to a polyethylene extruder, the PC steel stranded wire 1
Since there is no filling such as grease on the outer surface of the polyethylene, the outer surface of the PC steel stranded wire 1 on which the resin coating 5 is formed is covered with the polyethylene sheath 2 in a contact state to form the resin coating 5 as shown in FIG. In some cases, a predetermined clearance cannot be formed between the PC steel strand 1 and the polyethylene sheath 2.
【０００９】図４に示すような、樹脂被膜５を形成した
ＰＣ鋼より線１の外面に、ポリエチレンシース２が接触
状態で被覆されたアンボンドＰＣ鋼より線では、コンク
リートやグラウト等でポリエチレンシース２の外周が拘
束されると、ポリエチレンシース２内で、樹脂被膜を形
成したＰＣ鋼より線１が自由に動きにくく、アンボンド
状態にならないことがあった。そこで、この発明は、樹
脂被膜を形成したＰＣ鋼より線の外面に、グリースを充
填することなく、直接ポリエチレンシースを被覆する場
合に、樹脂被膜を形成したＰＣ鋼より線の外面にポリエ
チレンシースが接触しないで、所定のクリアランスを形
成することができる、アンボンドＰＣ鋼より線の製造方
法を提供しようとするものである。As shown in FIG. 4, in the case of an unbonded PC stranded wire in which the polyethylene sheath 2 is covered in contact with the outer surface of the PC stranded wire 1 having a resin coating 5 formed thereon, the polyethylene sheath 2 is made of concrete or grout. If the outer periphery of the wire was constrained, the wire 1 made of PC steel with a resin coating formed thereon could not move freely in the polyethylene sheath 2 and the unbonded state could not occur. Therefore, according to the present invention, when the polyethylene sheath is directly coated on the outer surface of the resin-coated PC steel wire without being filled with grease, a polyethylene sheath is formed on the outer surface of the resin-coated PC steel wire. An object of the present invention is to provide a method for manufacturing an unbonded PC steel stranded wire capable of forming a predetermined clearance without contact.
【００１０】[0010]
【課題を解決するための手段】この発明は、上記の課題
を解決するために、樹脂被覆を形成したＰＣ鋼より線の
外周に、ポリエチレンシースを押し出し成形する際に、
ＰＣ鋼より線とポリエチレンシースとの間に、圧力空気
を送り込んでポリエチレンシースを膨らませることによ
り、樹脂被膜を形成したＰＣ鋼より線とポリエチレンシ
ースとの間に所定のクリアランスを設けるようにしたも
のである。SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a polyethylene sheath on the outer periphery of a PC steel stranded wire having a resin coating formed by extrusion molding.
Pressure air is sent between the PC steel stranded wire and the polyethylene sheath to inflate the polyethylene sheath so that a predetermined clearance is provided between the PC stranded wire having the resin coating and the polyethylene sheath. Is.
【００１１】樹脂被膜を形成したＰＣ鋼より線の外周
に、ポリエチレンシースを押し出し成形する際に、その
まま樹脂被膜を形成したＰＣ鋼より線とポリエチレンシ
ースとを引っ張ると、ポリエチレンシースが樹脂被膜を
形成したＰＣ鋼より線の外周に接着し易いが、上記のよ
うに、ポリエチレンシースの内側に圧力空気を送り込ん
で、ポリエチレンシースを膨らませながら樹脂被膜を形
成したＰＣ鋼より線の外周にポリエチレンシースを被覆
することにより、ポリエチレンシースと樹脂被膜を形成
したＰＣ鋼より線の間にクリアランスを確実に形成する
ことが可能となる。When the polyethylene sheath is extruded on the outer periphery of the resin-coated PC steel wire and the polyethylene wire is pulled as it is, the polyethylene sheath forms the resin coating. Although it is easy to adhere to the outer circumference of the PC steel wire, as described above, the compressed air is sent to the inside of the polyethylene sheath to inflate the polyethylene sheath and form a resin coating on the outer circumference of the PC steel wire to cover the polyethylene sheath. By doing so, it becomes possible to surely form a clearance between the polyethylene sheath and the PC steel strand formed with the resin coating.
【００１２】また、ポリエチレンシースを所定の外径に
仕上げるためには、ポリエチレンシースの押し出し成形
後、ポリエチレンが冷却される前に、所定の孔形を有す
る成形治具内を通過させて、ポリエチレンシースの外径
を所定径にすることが望ましい。Further, in order to finish the polyethylene sheath to a predetermined outer diameter, after the polyethylene sheath is extruded and before the polyethylene is cooled, it is passed through a molding jig having a predetermined hole shape to form a polyethylene sheath. It is desirable to make the outer diameter of the predetermined diameter.
【００１３】また、ポリエチレンが冷却される前の垂れ
下がりを防止し、円形断面のポリエチレンシースを得る
ために、上記成形治具を水冷槽内に設置し、ポリエチレ
ンシースが軟化点以下に冷却されるまで、その形状を保
持しておくことが望ましい。Further, in order to prevent the polyethylene from sagging before being cooled and to obtain a polyethylene sheath having a circular cross section, the above molding jig is installed in a water cooling tank until the polyethylene sheath is cooled to a temperature below its softening point. It is desirable to keep its shape.
【００１４】また、ポリエチレンが硬化する前に、成形
治具を通過してしまうと、所定の外径のポリエチレンシ
ースが得られないことがあるため、成形治具は適度な間
隔を置いて複数個設置し、ポリエチレンが軟化点以下に
なるまで、ポリエチレンシースの外周が円形断面になる
ように保持しておくことが望ましい。Further, if the polyethylene sheath having a predetermined outer diameter cannot be obtained if it passes through the molding jig before the polyethylene is cured, a plurality of molding jigs should be provided at appropriate intervals. It is desirable that the polyethylene sheath is installed and held so that the outer circumference of the polyethylene sheath has a circular cross section until the polyethylene becomes lower than the softening point.
【００１５】成形治具を複数個設置する場合は、最初の
成形治具の孔径は、目的とする製品径よりも大きくし、
その後の成形治具の孔径を目的とする製品径にすること
により、より正確な成形を行うことが可能となる。When a plurality of molding jigs are installed, the hole diameter of the first molding jig should be larger than the intended product diameter.
By adjusting the hole diameter of the molding jig thereafter to the desired product diameter, more accurate molding can be performed.
【００１６】[0016]
【発明の実施の形態】図５は、この発明のアンボンドＰ
Ｃ鋼より線の製造方法の概略工程図である。FIG. 5 shows an unbonded P of the present invention.
It is a schematic process drawing of the manufacturing method of C steel stranded wire.
【００１７】まず、サプライ側ドラム６から、エポキシ
樹脂又はポリエチレン樹脂の樹脂被膜５を有するＰＣ鋼
より線１を、ピンチローラ７を介してポリエチレンの押
し出し成形機のクロスヘッド８内に供給する。First, a PC steel strand 1 having a resin coating 5 of epoxy resin or polyethylene resin is supplied from a supply side drum 6 through a pinch roller 7 into a crosshead 8 of a polyethylene extrusion molding machine.
【００１８】上記クロスヘッド８には、図６に示すよう
に、通過する樹脂被膜を形成したＰＣ鋼より線１の外周
面に、ポリエチレンシース２を被覆するために、溶融ポ
リエチレンＡを押し出すダイス９が設けられている。As shown in FIG. 6, the cross head 8 has a die 9 for extruding molten polyethylene A in order to coat the polyethylene sheath 2 on the outer peripheral surface of the PC steel strand 1 on which a resin coating is formed. Is provided.
【００１９】そして、上記クロスヘッド８の背後には、
樹脂被膜を形成したＰＣ鋼より線１とクロスヘッド８に
よって押し出されたポリエチレンシース２の間に圧力空
気Ｂを送り込む圧力送風用治具１０が装着され、押し出
したポリエチレンシース２を膨らませて、樹脂被膜を形
成したＰＣ鋼より線１とポリエチレンシース２との間の
接触を防止するようにしている。符号１１は、圧力空気
を供給するコンプレッサである。Behind the cross head 8,
A pressure blower jig 10 for feeding the compressed air B is mounted between the PC steel wire 1 on which the resin coating is formed and the polyethylene sheath 2 extruded by the crosshead 8, and the extruded polyethylene sheath 2 is inflated to form the resin coating. The contact between the PC steel stranded wire 1 and the polyethylene sheath 2 formed with the above is prevented. Reference numeral 11 is a compressor that supplies compressed air.
【００２０】押し出したポリエチレンシース２を膨らま
せる圧力空気は、大気圧よりも０．１〜０．４ｋｇｆ／
ｃｍ2大きいことが望ましい。０．１ｋｇｆ／ｃｍ2未満
では、押し出したポリエチレンシース２を十分に膨らま
せることができず、０．４ｋｇｆ／ｃｍ2以上にする
と、押し出したポリエチレンシース２が膨らみすぎて、
その後の成形治具１２の成形孔１３を通過し難くなる。The pressure air for inflating the extruded polyethylene sheath 2 is 0.1 to 0.4 kgf / atm higher than the atmospheric pressure.
It is desirable that it is larger by cm 2 . If it is less than 0.1 kgf / cm 2 , the extruded polyethylene sheath 2 cannot be sufficiently inflated, and if it is 0.4 kgf / cm 2 or more, the extruded polyethylene sheath 2 is too swollen,
After that, it becomes difficult to pass through the molding hole 13 of the molding jig 12.
【００２１】成形治具１２には、ポリエチレンシース２
の外周を成形する成形孔１３が設けられ、この成形孔１
３内を通過する間に、ポリエチレンシース２が硬化し、
所定の外径に仕上げられる。この成形治具１２は、水冷
槽１４内に、適度な間隔を置いて複数個設置され、最初
の成形治具の孔径は、目的とする製品径よりも大きく
し、その後の成形治具１２の孔径を目的とする製品径に
して、冷却に伴ってより正確な成形を行えるようにして
いる。The molding jig 12 has a polyethylene sheath 2
A molding hole 13 for molding the outer periphery of the
While passing through the inside 3, the polyethylene sheath 2 hardens,
Finished to a specified outer diameter. A plurality of the molding jigs 12 are installed in the water cooling tank 14 at appropriate intervals, and the hole diameter of the first molding jig is made larger than the target product diameter, and the molding jigs 12 after that are formed. The hole diameter is made the target product diameter so that more accurate molding can be performed with cooling.
【００２２】上記のようにして、ポリエチレンシース２
が被覆されたアンボンドＰＣ鋼より線は、ピンチローラ
１５を介して、巻取りドラム１６に巻き取られる。As described above, the polyethylene sheath 2
The unbonded PC steel stranded wire coated with is wound around the winding drum 16 via the pinch roller 15.
【００２３】また、成形治具１２としては、図８に示す
ように、ポリエチレンシース２の目的とする製品径を有
する半割り状の鋼製型１７が、キャタピラ状に上下に並
んで回転するようにしたものでもよい。この半割り状の
鋼製型１７には、水冷設備を設置している。Further, as the forming jig 12, as shown in FIG. 8, half-steel steel molds 17 having a desired product diameter of the polyethylene sheath 2 are rotated vertically in a caterpillar shape. You can use the one A water cooling facility is installed in the half-shaped steel mold 17.
【００２４】[0024]
【実験例】図５のアンボンドＰＣ鋼より線の製造設備に
おいて、樹脂被膜５を形成したＰＣ鋼より線１として、
裸線径が１５．２ｍｍのものを使用し、クロスヘッド８
内のポリエチレンの温度が１８０℃、圧力空気の圧力を
０．２５ｋｇｆ／ｃｍ2、クロスヘッド８のダイスの内
径を３６ｍｍにして、ポリエチレンシース２を膨らませ
ながら、被覆した後、水冷槽１４内に設置した４個の成
形治具１２内を通過させて、アンボンドＰＣ鋼より線を
製造した。４個の成形治具１２のうち、最初の成形治具
１２の成形孔１３の孔径は、２６ｍｍ、後の３個の孔径
は、２３．５ｍｍとし、最初の成形治具１２は、水冷槽
１４の左端から１２ｃｍのところに、その後のものは、
８０ｃｍの間隔をあけて設置した。水冷槽１４の水温
は、１５℃に設定した。[Experimental Example] In the unbonded PC stranded wire manufacturing facility of FIG. 5, as the PC stranded wire 1 on which the resin coating 5 is formed,
Use a bare wire with a diameter of 15.2 mm and cross head 8
The temperature of the polyethylene inside is 180 ° C., the pressure of the compressed air is 0.25 kgf / cm 2 , the inner diameter of the die of the crosshead 8 is 36 mm, and the polyethylene sheath 2 is inflated and covered, and then installed in the water cooling tank 14. The unbonded PC steel wire was manufactured by passing through the four forming jigs 12 described above. Of the four forming jigs 12, the forming diameter of the forming hole 13 of the first forming jig 12 is 26 mm, and the diameters of the following three forming jigs are 23.5 mm. 12 cm from the left end of the
It was installed with an interval of 80 cm. The water temperature of the water cooling tank 14 was set to 15 ° C.
【００２５】上記の条件で、樹脂被膜を形成した１５．
２ｍｍのＰＣ鋼より線の外周に、外径が２３．５ｍｍ
で、肉厚が２ｍｍのポリエチレンシース２が被覆された
アンボンドＰＣ鋼より線を製造することができた。15. A resin film was formed under the above conditions.
23.5 mm outer diameter on the outer circumference of a 2 mm PC stranded wire
Thus, a wire could be manufactured from unbonded PC steel coated with a polyethylene sheath 2 having a wall thickness of 2 mm.
【００２６】[0026]
【発明の効果】この発明の製造方法によると、ポリエチ
レンシースとその内側の樹脂被膜を形成したＰＣ鋼より
線との間に、所定のクリアランスを有するアンボンドＰ
Ｃ鋼より線を正確に製造することができる。According to the manufacturing method of the present invention, the unbonded P having a predetermined clearance between the polyethylene sheath and the PC steel stranded wire on which the resin coating is formed is provided.
It is possible to accurately manufacture a wire from C steel.
【図１】従来のアンボンドＰＣ鋼より線を示す断面図で
ある。FIG. 1 is a cross-sectional view showing a conventional unbonded PC steel strand.
【図２】図１の構造のアンボンドＰＣ鋼より線に止水用
のチューブを被せた状態を示す断面図である。FIG. 2 is a cross-sectional view showing a state in which an unbonded PC steel stranded wire having the structure of FIG. 1 is covered with a water blocking tube.
【図３】この発明に係る製造方法によって製造しようと
するアンボンドＰＣ鋼より線を示す断面図である。FIG. 3 is a cross-sectional view showing an unbonded PC steel strand to be manufactured by the manufacturing method according to the present invention.
【図４】ポリエチレンシースがより線に接触した状態を
示すアンボンドＰＣ鋼より線の断面図である。FIG. 4 is a cross-sectional view of an unbonded PC stranded wire in which a polyethylene sheath is in contact with the stranded wire.
【図５】この発明に係るアンボンドＰＣ鋼より線の製造
工程を示す概略図である。FIG. 5 is a schematic view showing a manufacturing process of an unbonded PC steel strand according to the present invention.
【図６】図５のクロスヘッド部分の断面図である。6 is a cross-sectional view of the crosshead portion of FIG.
【図７】図６のVII-VII線の断面図である。7 is a sectional view taken along line VII-VII of FIG.
【図８】図８はこの発明に係るアンボンドＰＣ鋼より線
の別な製造工程を示す概略図である。FIG. 8 is a schematic view showing another manufacturing process of the unbonded PC steel strand according to the present invention.
１ ＰＣ鋼より線 ２ ポリエチレンシース ３ グリース ４ チューブ ５ 樹脂被膜 ６ サプライ側ドラム ７ ピンチローラ ８ クロスヘッド ９ ダイス １０ 圧力成形用治具 １１ コンプレッサ １２ 成形治具 １３ 成形孔 １４ 水冷槽 １５ ピンチローラ １６ 巻取りドラム １７ 鋼製型 1 PC steel stranded wire 2 polyethylene sheath 3 grease 4 tubes 5 Resin coating 6 Supply side drum 7 pinch rollers 8 crosshead 9 dice 10 Pressure forming jig 11 compressor 12 Molding jig 13 Molding hole 14 Water cooling tank 15 pinch rollers 16 winding drum 17 Steel mold
───────────────────────────────────────────────────── フロントページの続き (72)発明者 飯尾 英二 伊丹市昆陽北一丁目１番１号 住友電気工 業株式会社伊丹製作所内 Ｆターム(参考） 4F207 AA04 AD03 AD15 AD18 AH34 AH43 KA01 KA17 KB18 KJ06 KK54 KK56 KL58 KL74 KL86 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Eiji Iio Sumitomo Electric Co., Ltd. 1-1-1 Koyo Kita, Itami City Business Itami Manufacturing Co., Ltd. F term (reference) 4F207 AA04 AD03 AD15 AD18 AH34 AH43 KA01 KA17 KB18 KJ06 KK54 KK56 KL58 KL74 KL86
Claims (5)
に、ポリエチレンシースを押し出し成形により被覆する
アンボンドＰＣ鋼より線の製造方法において、樹脂被膜
を形成したＰＣ鋼より線の外周に、ポリエチレンシース
を押し出し成形する際に、樹脂被膜を形成したＰＣ鋼よ
り線とポリエチレンシースとの間に、圧力空気を送り込
んで、ポリエチレンシースを膨らませることにより、樹
脂被膜を形成したＰＣ鋼より線とポリエチレンシースと
の間にクリアランスを設けることを特徴とするアンボン
ドＰＣ鋼より線の製造方法。1. A method for producing an unbonded PC stranded wire in which a polyethylene sheath is extruded to cover the outer periphery of a resin-coated PC stranded wire, wherein polyethylene is applied to the outer periphery of the resin-coated PC steel stranded wire. During extrusion molding of the sheath, pressurized air is sent between the PC steel stranded wire having the resin coating formed thereon and the polyethylene sheath to inflate the polyethylene sheath, whereby the PC steel stranded wire having the resin coating formed thereon and the polyethylene sheath. A method for manufacturing an unbonded PC stranded wire, which comprises providing a clearance between the stranded wire and the sheath.
ポリエチレンシースとの間に圧力空気を送り込みなが
ら、ポリエチレンシースを押し出し成形した後、所定の
孔形を有する成形治具内を通過させて、ポリエチレンシ
ースの外径を所定径にすることを特徴とする請求項１記
載のアンボンドＰＣ鋼より線の製造方法。2. The polyethylene sheath is extruded and molded while feeding pressurized air between the PC steel wire having the resin coating formed thereon and the polyethylene sheath, and then passed through a molding jig having a predetermined hole shape. The method for producing an unbonded PC stranded wire according to claim 1, wherein the polyethylene sheath has an outer diameter of a predetermined diameter.
ポリエチレンシースとの間に圧力空気を送り込んで、ポ
リエチレンシースを膨らませながらポリエチレンシース
を押し出し成形した後、水冷槽を通過させてポリエチレ
ンシースを冷却することを特徴とする請求項１又は２記
載のアンボンドＰＣ鋼より線の製造方法。3. The polyethylene sheath is extruded while inflating the polyethylene sheath by injecting pressurized air between the PC steel wire formed with the resin coating and the polyethylene sheath, and then the polyethylene sheath is passed through a water cooling tank to form the polyethylene sheath. The method for producing an unbonded PC steel strand according to claim 1 or 2, characterized by cooling.
置されている請求項３記載のアンボンドＰＣ鋼より線の
製造方法。4. The method for producing an unbonded PC stranded wire according to claim 3, wherein the forming jig according to claim 2 is installed in a water cooling tank.
最初の成形治具の孔径がポリエチレンシースの製品径よ
りも大きく形成されている請求項４記載のアンボンドＰ
Ｃ鋼より線の製造方法。5. A plurality of molding jigs are installed in the water cooling tank,
The unbonded P according to claim 4, wherein the hole diameter of the first molding jig is formed larger than the product diameter of the polyethylene sheath.
Method for manufacturing C stranded wire.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229767A JP3628635B2 (en) | 2001-07-30 | 2001-07-30 | Unbonded PC steel strand manufacturing method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2001229767A JP3628635B2 (en) | 2001-07-30 | 2001-07-30 | Unbonded PC steel strand manufacturing method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2003039522A true JP2003039522A (en) | 2003-02-13 |
| JP3628635B2 JP3628635B2 (en) | 2005-03-16 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2001229767A Expired - Lifetime JP3628635B2 (en) | 2001-07-30 | 2001-07-30 | Unbonded PC steel strand manufacturing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008248645A (en) * | 2007-03-30 | 2008-10-16 | Psl Japan Kk | Structure of anchor and constructing method of anchor |
| JP2012097449A (en) * | 2010-11-01 | 2012-05-24 | Sumitomo Electric Ind Ltd | Pc steel |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102179862B (en) * | 2011-04-11 | 2012-02-22 | 黄石市汇波防腐技术有限公司 | Making technology of once-moulding whole resin concrete electrolytic cell |
-
2001
- 2001-07-30 JP JP2001229767A patent/JP3628635B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008248645A (en) * | 2007-03-30 | 2008-10-16 | Psl Japan Kk | Structure of anchor and constructing method of anchor |
| JP2012097449A (en) * | 2010-11-01 | 2012-05-24 | Sumitomo Electric Ind Ltd | Pc steel |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3628635B2 (en) | 2005-03-16 |
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