JPH031436B2 - - Google Patents
Info
- Publication number
- JPH031436B2 JPH031436B2 JP63180251A JP18025188A JPH031436B2 JP H031436 B2 JPH031436 B2 JP H031436B2 JP 63180251 A JP63180251 A JP 63180251A JP 18025188 A JP18025188 A JP 18025188A JP H031436 B2 JPH031436 B2 JP H031436B2
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- strand
- strands
- coating
- twisted
- 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
- 229920003002 synthetic resin Polymers 0.000 claims description 28
- 239000000057 synthetic resin Substances 0.000 claims description 28
- 238000000576 coating method Methods 0.000 claims description 20
- 239000011248 coating agent Substances 0.000 claims description 17
- 238000000034 method Methods 0.000 claims description 10
- 239000000843 powder Substances 0.000 claims description 9
- 238000010438 heat treatment Methods 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 4
- 229920001169 thermoplastic Polymers 0.000 claims description 3
- 239000004416 thermosoftening plastic Substances 0.000 claims description 3
- 239000004567 concrete Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 238000010276 construction Methods 0.000 description 6
- 239000002994 raw material Substances 0.000 description 5
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 4
- 239000010410 layer Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 239000007787 solid Substances 0.000 description 3
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000037431 insertion Effects 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000004568 cement Substances 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 239000008267 milk Substances 0.000 description 1
- 210000004080 milk Anatomy 0.000 description 1
- 235000013336 milk Nutrition 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 239000011513 prestressed concrete Substances 0.000 description 1
- 230000002265 prevention Effects 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B7/00—Details of, or auxiliary devices incorporated in, rope- or cable-making machines; Auxiliary apparatus associated with such machines
- D07B7/16—Auxiliary apparatus
- D07B7/18—Auxiliary apparatus for spreading or untwisting ropes or cables into constituent parts for treatment or splicing purposes
- D07B7/185—Auxiliary apparatus for spreading or untwisting ropes or cables into constituent parts for treatment or splicing purposes for temporarily untwisting ropes or cables into constituent parts for applying a coating
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2042—Strands characterised by a coating
- D07B2201/2044—Strands characterised by a coating comprising polymers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2201/00—Ropes or cables
- D07B2201/20—Rope or cable components
- D07B2201/2015—Strands
- D07B2201/2046—Strands comprising fillers
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2401/00—Aspects related to the problem to be solved or advantage
- D07B2401/20—Aspects related to the problem to be solved or advantage related to ropes or cables
- D07B2401/202—Environmental resistance
- D07B2401/2025—Environmental resistance avoiding corrosion
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B2501/00—Application field
- D07B2501/20—Application field related to ropes or cables
- D07B2501/2015—Construction industries
- D07B2501/2023—Concrete enforcements
Landscapes
- Coating Apparatus (AREA)
- Treatments For Attaching Organic Compounds To Fibrous Goods (AREA)
- Reinforcement Elements For Buildings (AREA)
- Ropes Or Cables (AREA)
- Application Of Or Painting With Fluid Materials (AREA)
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明はプレストレストコンクリート（以下
PCと記す）の緊張に使用する撚線（ストランド）
に防錆被覆を施すPCストランドの防錆被覆方法
に関する。[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to prestressed concrete (hereinafter referred to as
Twisted wire (strand) used for tensioning (noted as PC)
This invention relates to a rust-proof coating method for PC strands.
（従来の技術）
従来、PCストランドは合成樹脂シース内に挿
入し、該シースとストランドの間にグリース等の
防錆材料を充填して、いわゆるアンボンドケーブ
ルとなし、これをコンクリート内に埋設して緊張
するアンボンド工法や、コンクリート内に埋設し
た鋼製シース内に挿通し緊張の後、セメントミル
ク等のグラフト材をシース内に充填してコンクリ
ートと一体化させるポストテンシヨンボンド工
法、更にはシースを使用しないで予かじめPCス
トランドを緊張しておき、これをコンクリート内
に埋設し、コンクリートの固化後、端部を切断す
るプレテンシヨンボンド工法等に使用されてい
る。(Prior art) Conventionally, a PC strand is inserted into a synthetic resin sheath, and a rust-preventive material such as grease is filled between the sheath and the strand to form a so-called unbonded cable, which is then buried in concrete. There is the unbond method, which involves tensioning, and the post-tension bond method, which involves inserting a steel sheath buried in concrete and tensioning it, then filling the sheath with a grafting material such as cement milk and integrating it with the concrete. It is used in pretension bond construction methods, etc., in which the PC strand is tensed in advance without being used, it is buried in concrete, and the ends are cut off after the concrete hardens.
これらの各工法の内、アンボンド工法において
は防錆材が使用されているが、その他の工法に使
用する場合はPCストランドが直接コンクリート
と接触しており、コンクリートを通して水がPC
ストランドに達する状態となつている。 Among these construction methods, anti-rust materials are used in the unbonded construction method, but when used in other construction methods, the PC strands are in direct contact with the concrete, and water flows through the concrete.
It is now ready to reach the strand.
一方、アンボンド工法においても、最外部のシ
ースが破損した場合にはシース内に水が浸透し、
PCストランドに達することとなり充分な防錆と
はいえない。 On the other hand, even in the unbonded construction method, if the outermost sheath is damaged, water will penetrate into the sheath.
Since it reaches the PC strand, it cannot be said to be sufficient rust prevention.
そこで近年においてPCストランドの外面を接
着性を有する合成樹脂層にて被覆し、その外側に
潤滑剤層を介して合成樹脂シース内に挿通しポス
トテンシヨンアンボンド工法に使用するものや、
合成樹脂被覆を施したものを緊張の後、直接コン
クリート内に埋め込むプレテンシヨンボンド工法
に使用するものが開発されるに到つた。 Therefore, in recent years, the outer surface of the PC strand is coated with a synthetic resin layer with adhesive properties, and the outer surface of the PC strand is inserted into the synthetic resin sheath via a lubricant layer to be used in the post-tension unbond method.
A product has been developed that can be used in the pretension bond method, in which a synthetic resin-coated material is placed directly into concrete after tensioning.
（発明が解決しようとする課題）
このような従来のPCストランドは合成樹脂被
覆が施されていても、ストランドを構成している
各単線間には空隙があり、この空隙に端部から水
や空気が侵入し、PCストランドを腐食させると
いう問題があつた。(Problem to be Solved by the Invention) Even though such conventional PC strands are coated with synthetic resin, there are gaps between each of the single wires that make up the strand, and water and water can enter into these gaps from the ends. There was a problem with air entering and corroding the PC strands.
本発明はこのように従来の問題にかんがみ、よ
り簡単な工程により、PCストランドの各単線間
の空隙をも完全に合成樹脂材にて埋めると同時に
外面をも被覆することのできるPCストランドの
防錆被覆方法の提供を目的としたものである。 In view of the conventional problems, the present invention provides a protection for PC strands that can completely fill the gaps between each single wire of the PC strand with a synthetic resin material and at the same time cover the outer surface of the PC strand using a simpler process. The purpose is to provide a rust coating method.
（課題を解決するための手段）
上述の如き目的を達成するための本発明の要旨
とするところは、複数の単線を撚り合わせたPC
ストランドを加熱した後、撚り拡げ機に連続して
送り込み、該PCストランドの各単線間が互いに
離反した状態に撚りを拡げ、その撚り拡げられた
各単線に熱可塑性を有する合成樹脂被覆粉末を流
動接触させて付着させ、該合成樹脂粉末を加熱溶
融させた後、元の撚り合わせ状態に戻し、該PC
ストランドの内外に合成樹脂被覆層を形成するこ
とを特徴としてなるPCストランドの防錆被覆方
法に存する。(Means for Solving the Problems) The gist of the present invention for achieving the above-mentioned objects is to provide a PC made by twisting a plurality of single wires.
After heating the strands, they are continuously fed into a twisting and spreading machine to spread the twists so that each single wire of the PC strand is separated from each other, and a thermoplastic synthetic resin coating powder is flowed onto each of the twisted and spread single wires. After the synthetic resin powder is heated and melted, the PC is returned to its original twisted state.
The present invention relates to a method for anticorrosion coating of PC strands, which is characterized by forming synthetic resin coating layers on the inside and outside of the strands.
（作用）
この方法はPCストランドを撚り拡げ機に通す
ことにより、各単線間が離されるように半径方向
に拡げられる。これに粉末合成樹脂材料が流動供
給されることにより、各単線毎にその全周面に樹
脂材料が付着し、各単線の熱にて溶融される。そ
してPCストランドの撚りが元に戻り、単線間が
縮まることにより各単線間の空隙内に合成樹脂が
充填されることとなる。一方、PCストランドの
外面にも合成樹脂被覆層が形成される。(Operation) In this method, the PC strands are passed through a twisting and spreading machine to spread them in the radial direction so that the individual wires are separated from each other. By fluidly supplying the powdered synthetic resin material to this, the resin material adheres to the entire circumferential surface of each single wire and is melted by the heat of each single wire. The PC strands are then untwisted and the distance between the single wires is reduced, so that the voids between each single wire are filled with synthetic resin. On the other hand, a synthetic resin coating layer is also formed on the outer surface of the PC strand.
（実施例） 次に本発明の実施例を図面について説明する。(Example) Next, embodiments of the present invention will be described with reference to the drawings.
第１図はこの実施例の各工程の概略を示してい
る。まずPCストランドコイル１を巻き戻し台に
載せ、PCストランド２を連続して繰り出させ、
加熱炉３、撚り戻し機４、合成樹脂被着槽５、及
び冷却槽６に順に通し、巻き取り台７のリール８
に巻き取るようにしている。 FIG. 1 shows an outline of each step of this embodiment. First, the PC strand coil 1 is placed on the unwinding table, and the PC strand 2 is continuously unwound.
The reel 8 on the winding table 7 is passed through the heating furnace 3, the untwisting machine 4, the synthetic resin coating tank 5, and the cooling tank 6 in order.
I try to wind it up.
加熱炉３では後述する合成樹脂粉末がPCスト
ランド２に接触することにより溶融する温度に加
熱するようにしている。 In the heating furnace 3, synthetic resin powder, which will be described later, is heated to a temperature at which it melts when it comes into contact with the PC strand 2.
撚り戻し機４はPCストランド２を強力に押し
出す送りローラ１０とPCストランド２を構成し
ている各単線２ａ，２ａ……を個別に挿通する複
数の単線挿込孔１１，１１……を間隔を隔てて開
口させた円形の撚り拡げダイス１２を有し、この
ダイス１２は支持リング１３内に回転自在に収容
されている。このダイス１２の各単線挿通孔１
１，１１……にPCストランド２の先端から、そ
の撚りをすこし戻して各単線２ａ，２ａ……を挿
通し、送りローラ１０によつて送り出すことによ
り、ダイス１２位置で撚りが拡げられる。そし
て、この位置を通過するとPCストランドの弾性
により徐々に撚りが元に戻る。 The untwisting machine 4 has a feed roller 10 that strongly pushes out the PC strand 2, and a plurality of single wire insertion holes 11, 11, . . ., through which the individual wires 2a, 2a, . It has spaced apart circular spreading dies 12 which are rotatably housed within a support ring 13. Each single wire insertion hole 1 of this die 12
1, 11... from the tip of the PC strand 2, the twist is slightly untwisted, each single wire 2a, 2a... is inserted and sent out by the feed roller 10, and the twist is expanded at the die 12 position. After passing this position, the twist gradually returns to its original state due to the elasticity of the PC strand.
合成樹脂被着槽５は、撚り戻し機４によつて
PCストランド２が各単線２ａ毎に互いに離反し
ている状態にあるときに、その各単線２ａにポリ
オレフイン系の接着性を有する熱可塑性合成樹脂
粉末を付着させるようにしているものであり、第
３図に示すように原料収容槽１４内にその底面の
キヤンバス１５を通して送風機１６より送風し、
これによつて合成樹脂粉末を浮揚させる。原料収
容槽１４内にはPCストランド２を中心に挿通す
るガイドパイプ１７が設けられ、このガイドパイ
プ１７はその一端に、原料収容槽１４内に開口し
た吸込口１８が設けられ、他端に原料収容槽１４
内と連通させる戻し流路１９が連通され、その戻
し流路１９に強制循環用ブロワー２０が設けられ
ている。このブロワー２０によつてガイドパイプ
１７内に原料収容槽１４内の空気を強制循環させ
ることにより浮揚している合成樹脂粉末をガイド
パイプ１７内に吸い込みPCストランド２に接触
させるようにしている。そして、ブロワー２０に
よる送風量を調節することにより被着量が変化さ
れる。 The synthetic resin coating tank 5 is heated by the untwisting machine 4.
When the PC strands 2 are in a state where each single wire 2a is separated from each other, thermoplastic synthetic resin powder having polyolefin-based adhesive properties is attached to each single wire 2a. As shown in the figure, air is blown from a blower 16 through a canvas 15 on the bottom of the raw material storage tank 14,
This causes the synthetic resin powder to float. A guide pipe 17 is provided in the raw material storage tank 14, through which the PC strand 2 is inserted.This guide pipe 17 has a suction port 18 that opens into the raw material storage tank 14 at one end, and a raw material at the other end. Storage tank 14
A return flow path 19 is communicated with the inside, and a forced circulation blower 20 is provided in the return flow path 19. By forcing the air in the raw material storage tank 14 into the guide pipe 17 by using the blower 20, the floating synthetic resin powder is sucked into the guide pipe 17 and brought into contact with the PC strand 2. Then, by adjusting the amount of air blown by the blower 20, the amount of deposition is changed.
冷却槽６ではPCストランド２に接触して加熱
溶融した合成樹脂を送風によつて冷却し硬化させ
るようにしている。 In the cooling tank 6, the synthetic resin heated and melted in contact with the PC strand 2 is cooled and hardened by air blowing.
このようにして合成樹脂被覆されるPCストラ
ンド２は、被着槽５内における被着量を少く調節
することにより、第５図に示すように中実でしか
も外面がPCストランド２の撚り形状を有する被
覆層ａが形成される。一方、被着量を多くし、第
４図に示すように円錐形内面の成型ダイス２１内
に通すことにより、第６図に示すように中実でし
かも外面が円形の被覆層ｂが形成される。 By adjusting the amount of coating in the coating tank 5 to a small extent, the PC strand 2 coated with the synthetic resin in this way is solid and the outer surface has a twisted shape of the PC strand 2, as shown in FIG. A coating layer a having the following properties is formed. On the other hand, by increasing the coating amount and passing it through a molding die 21 with a conical inner surface as shown in FIG. 4, a solid covering layer b with a circular outer surface is formed as shown in FIG. Ru.
（発明の効果）
上述の如く本発明のPCストランドの防錆被覆
方法は、PCストランドを連続して撚り拡げ機に
送り込み、その撚りを拡げて各単線間を離反させ
た状態で合成樹脂粉末を被着させ、その後、元の
撚り状態に戻すようにしたことにより、各単線間
の間隙に合成樹脂が充填された中実の合成樹脂被
覆が連続して自動的に行われ、しかも外面に撚線
形状を残した被覆、もしくは外面を円形に成型し
た被覆を適宜選択することができ、アンボンド工
法用にもボンド工法用にもなすことができ、簡単
な工程によつて完全な防錆被覆が得られることと
なつたものである。(Effects of the Invention) As described above, the method for anti-corrosion coating of PC strands of the present invention involves continuously feeding the PC strands into a twisting and spreading machine, spreading the twists, and applying synthetic resin powder while separating the individual wires. By coating the single wires and then returning them to their original twisted state, a solid synthetic resin coating with synthetic resin filled in the gaps between each single wire is continuously and automatically applied, and the outer surface is not twisted. A coating that retains a linear shape or a coating that has a circular outer surface can be selected as appropriate, and can be used for both unbonded and bonded construction methods, and a complete anti-rust coating can be achieved through a simple process. It has become something that can be obtained.
第１図は本発明の実施例の概略構成を示す側面
図、第２図は撚り拡げダイスの正面図、第３図は
撚り拡げ機及び被着槽部分の断面図、第４図は合
成樹脂被着工程の一例の断面図、第５図、第６図
は別々の被覆状態を示す断面図である。
ａ，ｂ……被覆層、１……PCストランドコイ
ル、２……PCストランド、２ａ……単線、３…
…加熱炉、４……撚り戻し機、５……合成樹脂被
着槽、６……冷却槽、７……巻き取り台、８……
リール。
Fig. 1 is a side view showing a schematic configuration of an embodiment of the present invention, Fig. 2 is a front view of the twisting and spreading die, Fig. 3 is a sectional view of the twisting and spreading machine and deposition tank, and Fig. 4 is a synthetic resin A sectional view of an example of the coating process, and FIGS. 5 and 6 are sectional views showing different coating states. a, b...Covering layer, 1...PC strand coil, 2...PC strand, 2a...Single wire, 3...
... Heating furnace, 4 ... Untwisting machine, 5 ... Synthetic resin coating tank, 6 ... Cooling tank, 7 ... Winding table, 8 ...
reel.
Claims (1)
加熱した後、撚り拡げ機に連続して送り込み、該
PCストランドの各単線間が互いに離反した状態
に撚りを拡げ、その撚り拡げられた各単線に熱可
塑性を有する合成樹脂被覆粉末を流動接触させて
付着させ、該合成樹脂粉末を加熱溶融させた後、
元の撚り合わせ状態に戻し、該PCストランドの
内外に合成樹脂被覆層を形成することを特徴とし
てなるPCストランドの防錆被覆方法。1 After heating the PC strand, which is made by twisting multiple single wires together, it is continuously fed into a twisting and spreading machine to
After the individual wires of the PC strand are twisted so that they are separated from each other, a thermoplastic synthetic resin coating powder is adhered to each twisted wire by flowing contact, and the synthetic resin powder is heated and melted. ,
A method for anticorrosive coating of PC strands, which comprises returning the PC strands to their original twisted state and forming synthetic resin coating layers on the inside and outside of the PC strands.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63180251A JPH0233386A (en) | 1988-07-21 | 1988-07-21 | Rustproof coating of pc strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63180251A JPH0233386A (en) | 1988-07-21 | 1988-07-21 | Rustproof coating of pc strand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0233386A JPH0233386A (en) | 1990-02-02 |
| JPH031436B2 true JPH031436B2 (en) | 1991-01-10 |
Family
ID=16080002
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63180251A Granted JPH0233386A (en) | 1988-07-21 | 1988-07-21 | Rustproof coating of pc strand |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0233386A (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH072256B2 (en) * | 1990-08-31 | 1995-01-18 | 株式会社タイムエンジニアリング | Method for producing anticorrosion coated PC strand |
| JP2691113B2 (en) * | 1992-11-13 | 1997-12-17 | 黒沢建設株式会社 | Anticorrosion film forming method for PC steel stranded wire and anticorrosion film forming apparatus for implementing the method |
| CA2697961C (en) | 2007-08-23 | 2015-12-29 | Sumitomo (Sei) Steel Wire Corp. | Powder coating composition for pc strand coating, coating method, and coating film |
| JP4676009B2 (en) * | 2009-04-23 | 2011-04-27 | 黒沢建設株式会社 | PC steel strand anticorrosive film forming method and PC steel strand |
-
1988
- 1988-07-21 JP JP63180251A patent/JPH0233386A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0233386A (en) | 1990-02-02 |
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