JPH0270852A - High corrosion-resisting pc steel strand - Google Patents
High corrosion-resisting pc steel strandInfo
- Publication number
- JPH0270852A JPH0270852A JP21928288A JP21928288A JPH0270852A JP H0270852 A JPH0270852 A JP H0270852A JP 21928288 A JP21928288 A JP 21928288A JP 21928288 A JP21928288 A JP 21928288A JP H0270852 A JPH0270852 A JP H0270852A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- steel
- concrete
- time
- stranded wire
- 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
- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 28
- 239000010959 steel Substances 0.000 title claims abstract description 28
- 239000011347 resin Substances 0.000 claims abstract description 17
- 229920005989 resin Polymers 0.000 claims abstract description 17
- 238000005260 corrosion Methods 0.000 claims abstract description 12
- 230000007797 corrosion Effects 0.000 claims abstract description 10
- 239000004033 plastic Substances 0.000 claims abstract description 8
- 229920003023 plastic Polymers 0.000 claims abstract description 8
- 238000001125 extrusion Methods 0.000 claims abstract description 5
- 239000010410 layer Substances 0.000 claims description 5
- 239000011247 coating layer Substances 0.000 claims description 4
- 238000000576 coating method Methods 0.000 abstract description 8
- 239000011248 coating agent Substances 0.000 abstract description 7
- 238000000034 method Methods 0.000 abstract description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 5
- 230000010354 integration Effects 0.000 abstract description 4
- 230000002265 prevention Effects 0.000 abstract description 2
- 239000007788 liquid Substances 0.000 abstract 1
- 238000002791 soaking Methods 0.000 abstract 1
- 239000004593 Epoxy Substances 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000004873 anchoring Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000004570 mortar (masonry) Substances 0.000 description 3
- -1 and as a result Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000003000 extruded plastic Substances 0.000 description 2
- 238000007765 extrusion coating Methods 0.000 description 2
- 239000004519 grease Substances 0.000 description 2
- 239000003973 paint Substances 0.000 description 2
- 239000006223 plastic coating Substances 0.000 description 2
- 238000007747 plating Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- JEIPFZHSYJVQDO-UHFFFAOYSA-N iron(III) oxide Inorganic materials O=[Fe]O[Fe]=O JEIPFZHSYJVQDO-UHFFFAOYSA-N 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000010792 warming Methods 0.000 description 1
Landscapes
- Reinforcement Elements For Buildings (AREA)
- Laminated Bodies (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、斜張橋や海洋構造物のように、厳しい腐食
環境下で耐久性を要求されるコンクリート構造物にボス
トテンション工法でプレストレスを加えるのに好適な耐
食性並びにコンクリートとの一体化性に冨むＰＣ鋼より
線に関するものである。[Detailed Description of the Invention] [Field of Industrial Application] This invention applies prestressing to concrete structures that require durability in severe corrosive environments, such as cable-stayed bridges and offshore structures, using the boss tension method. The present invention relates to stranded PC steel wires that have excellent corrosion resistance and good integration with concrete.
耐食性を付与したＰＣ鋼より線の従来例としては、特公
昭５３−４７６０９号、特開昭６１−１２２３６０号、
同６１−１２２３６１号、同６１−６９３１８号、特公
昭５６−３６２６４号の各公報に示される如きアンボン
ドタイプのものと、ボンドタイプのものがある。Conventional examples of PC steel stranded wires with corrosion resistance include JP-B No. 53-47609, JP-A No. 61-122360,
There are unbonded types as shown in Japanese Patent Publications No. 61-122361, No. 61-69318, and Japanese Patent Publication No. 56-36264, and bonded types.
第２図はアンボンドタイプの代表例であって、１は鋼よ
り線、３はプラスチ・ツクの押出し被覆、４はグリース
を示している。ボンドタイプのＰＣ鋼より線は、亜鉛メ
ツキのみを施したり、鋼より線の外周に直にプラスチッ
クの塗装コーティング層を設けたり（第３図がそれで５
が塗装コーティング層）、或いは上記の塗装コーティン
グに代えて鋼より線とは非接着の押出しコーティング層
を設けた構造である。なお、この場合の押出し被覆層３
は、第４図のように、外周が真円状になっている。FIG. 2 shows a typical example of the unbonded type, with 1 showing steel strands, 3 showing extruded plastic coating, and 4 showing grease. Bond type PC steel stranded wires are galvanized only, or a plastic paint coating layer is applied directly to the outer periphery of the steel stranded wire (Figure 3 shows 5).
Alternatively, in place of the above-mentioned paint coating, an extruded coating layer that does not adhere to the steel strands is provided. In addition, in this case, the extrusion coating layer 3
As shown in Fig. 4, the outer periphery is a perfect circle.
〔発明が解決しようとする課Ｂ］
アンボンドタイプは、綱より線がコンクリートと付着せ
ず、最外周の被覆材との間に良好な滑性が保たれるため
、コンクリートの打設硬化後も緊張が可能である。また
、第２図のように、グリース等の防錆、潤滑剤を鋼より
線に直に付着させたものは、線端からも水等が侵入し難
く腐食にも強い。しかし、このタイプのものは永久にア
ンボンド構造であるため、コンクリート構造物に活荷重
が作用したとき、その荷重が常に定着端部に加わり、そ
のため、当該部の疲労が早まると云う欠点を有している
。[Problem B to be solved by the invention] In the unbonded type, the rope strands do not adhere to the concrete and good lubricity is maintained between the outermost covering material, so even after the concrete has been placed and hardened. Tension is possible. Furthermore, as shown in FIG. 2, a wire in which anti-corrosion or lubricant such as grease is applied directly to the steel wire is resistant to corrosion because it is difficult for water to enter from the wire end. However, since this type of structure has a permanently unbonded structure, when a live load is applied to a concrete structure, the load is always applied to the anchoring end, which has the disadvantage of accelerating fatigue of that part. ing.
一方ボンドタイプのものは、コンクリートとの一体化に
関して、被覆材の形成のし方、或いは被覆材のコンクリ
ートとの接着性（コンクリート中にシースを埋設し、こ
の中に配置するものはシース中のモルタルとの接着性）
によってはある程度の差が見られるものの、かなりの効
果が期待でき、活荷重作用時にはコンクリートとＰＣ鋼
より線が一体となって挙動するため、定着端部に対する
荷重の集中がない。On the other hand, with respect to the bond type, the method of forming the covering material or the adhesion of the covering material to the concrete (the sheath is buried in the concrete, and the sheath placed inside the sheath is Adhesion with mortar)
Although there may be some differences depending on the method, a considerable effect can be expected, and since the concrete and the PC steel wire behave as one when a live load is applied, there is no concentration of load on the anchoring end.
ところが、このボンドタイプのＰＣ！ｉａより線のうち
、亜鉛メツキしたものは、メツキ処理に起因した強度低
下の問題を有している。However, this bond type PC! Among IA stranded wires, those that are galvanized have the problem of reduced strength due to the plating process.
また、プラスチックのコーティング層を設けるものは、
塗工又は押出し時のプラスチックが側線Ｌｌの微小クリ
アランスを通過するほどの流動性をもたないため、第３
図、第４図に示すように、中心素線１ａと側線１ｂ間の
隙間ｇにプラスチックが充填されず、そのため、ＰＣ鋼
より線の端末部から水等が隙間ｇを通って浸入し、鋼よ
り線の腐食を早めると云う問題がある。In addition, those with a plastic coating layer,
Because the plastic during coating or extrusion does not have enough fluidity to pass through the minute clearance of the side line Ll, the third
As shown in Fig. 4, the gap g between the center wire 1a and the side wire 1b is not filled with plastic, and as a result, water, etc. enters from the end of the PC steel strand through the gap g, and the steel There is a problem in that it accelerates the corrosion of the stranded wire.
そこで、この発明は、アンボンドタイプとボンドタイプ
の利点のみを併せ持つＰＣ鋼より線、つまり、耐食性と
コンクリートとの一体化性が共に優れるＰＣ鋼より線を
提供することを目的としている。Therefore, the object of the present invention is to provide a PC steel stranded wire that has only the advantages of the unbonded type and the bonded type, that is, a PC steel stranded wire that is excellent in both corrosion resistance and integration with concrete.
上記の問題点を無くすため、この発明では、第１図に示
すように、鋼より線１の外周に経時硬化性樹脂２の塗布
による層とプラスチックの押出し加工による被覆Ｎ３を
順に連続して施し、さらに、経時硬化性樹脂２は塗布時
に比較的流動性のあるものを用いてその樹脂を図のよう
に素線間の隙間に流入させる。In order to eliminate the above-mentioned problems, in this invention, as shown in FIG. 1, a layer of time-hardening resin 2 and a coating N3 of plastic extrusion are sequentially applied to the outer periphery of the steel stranded wire 1. Furthermore, the time-curable resin 2 is relatively fluid during application, and the resin is allowed to flow into the gaps between the wires as shown in the figure.
経時硬化性樹脂、例えば、鋼構造物の防錆、防食塗料と
して用いられている硬化材混入のタールエポキシは、Ｐ
Ｃ鋼より線に塗布する時にはかなりの流動性を示すため
、ポリエチレン等からなる３の層の押出し被覆後も、そ
のタールエポキシ自身が硬化するまでの間に側線１ｂ間
の微小クリアランスを通って徐々に中心素１１ａと側線
１ｂ間の隙間に流入し、その隙間を完全に埋めつくす。Time-curing resins, such as tar epoxy mixed with a hardening agent used as rust prevention and anti-corrosion coatings for steel structures, are P
When applied to C steel stranded wire, it exhibits considerable fluidity, so even after extrusion coating with three layers of polyethylene, etc., the tar epoxy gradually passes through the minute clearance between the side wires 1b until it hardens. It flows into the gap between the central element 11a and the side line 1b and completely fills the gap.
従って、端末部からの水等の浸入経路は皆無となる。Therefore, there is no path for water etc. to enter from the terminal portion.
また、タールエポキシは、素線が互いに接触している部
分を除く素線表面のほぼ全部とプラスチックの押出し被
Ｎ３の双方に接着して硬化するため、ＰＣ鋼より線１が
コンクリート、モルタルと一体となって挙動することが
可能になる。クールエポキシのＰＣ鋼より線１に対する
接着が仮に不十分であったとしても、そのタールエポキ
シが側線１ｂ間の谷の部分に充分に充填されて硬化する
ため、コンクリート、モルタルとの一体性はかなり良く
なり、従って、いずれにしても、定着端部への荷重の集
中が回避される。In addition, since the tar epoxy adheres and hardens to both almost the entire surface of the strands except for the parts where the strands are in contact with each other and to the extruded plastic N3, the PC steel stranded wire 1 is integrated with the concrete and mortar. It becomes possible to behave as follows. Even if the adhesion of the cool epoxy to the PC steel wire 1 is insufficient, the tar epoxy will sufficiently fill the valley between the side wires 1b and harden, so the integrity with concrete and mortar will be quite high. therefore, concentration of loads on the fixing edge is avoided in any case.
なお、経時硬化性樹脂２は、塗布時に適度の流動性を示
すものであれば、主剤と硬化剤から成る２液温合型の樹
脂等であっても発明の目的達成には支障がないが、コス
トを考えると安価なり−ルエポキシ等を用いるのが望ま
しい。It should be noted that the time-curable resin 2 may be a two-component warming type resin consisting of a base resin and a curing agent, as long as it exhibits appropriate fluidity during application, but there is no problem in achieving the purpose of the invention. Considering the cost, it is desirable to use epoxy or the like because it is inexpensive.
以上述べたように、この発明のＰＣ鋼より綿はコンクリ
ートと一体となって挙動することができるため、活荷重
に起因した定着端部の局部疲労が起こらない。As described above, since the cotton of the present invention's PC steel can behave as one with the concrete, local fatigue at the anchoring end due to live loads does not occur.
また、鋼より線の外周が経時硬化性樹脂とプラスチック
の押出し被覆に２重に覆われ、しかも、経時硬化性樹脂
が鋼より線内の隙間を埋めて端末からの水等の浸入を防
止しているため、強度低下につながるメツキ処理を施さ
なくても優れた耐食性が発渾される。In addition, the outer periphery of the steel stranded wire is double covered with an extruded coating of time-curing resin and plastic, and the time-curing resin fills the gaps within the steel stranded wire to prevent water from entering from the terminals. As a result, excellent corrosion resistance can be developed without plating, which can reduce strength.
従って、斜張橋や海洋構造物、或いは塩害を受は易いそ
の他の構造物に用いられるＰＣケーブルのように、高度
の耐食性と高い疲労強度が要求される用途に特に適し、
このような腐食環境下に設置される構造物であっても、
その耐久性を大きく向上させ得ると云う効果が得られる
。Therefore, it is particularly suitable for applications that require a high degree of corrosion resistance and high fatigue strength, such as PC cables used in cable-stayed bridges, offshore structures, or other structures susceptible to salt damage.
Even for structures installed in such corrosive environments,
The effect is that the durability can be greatly improved.
第１図は、この発明のＰＣ鋼より線の具体例を示す断面
図、第２図は従来のアンボンドタイプのＰＣｗＡより線
の一例を示す断面図、第３図、第４図は従来のポンドタ
イプのＰＣ鋼より線の一例を示す断面図である。
１・・・・・・ＰＣ鋼より線、 １ａ・・・・・・中
心素線、１ｂ・・・・・・側線、 ２・・・・・
・経時硬化性樹脂、３・・・・・・プラスチック被覆層
。
特許出願人 住友電気工業株式会社
同Fig. 1 is a sectional view showing a specific example of the PCwA stranded wire of the present invention, Fig. 2 is a sectional view showing an example of a conventional unbonded type PCwA stranded wire, and Figs. It is a sectional view showing an example of a type of PC steel stranded wire. 1...PC steel stranded wire, 1a...center strand, 1b...side wire, 2...
- Time-curable resin, 3...Plastic coating layer. Patent applicant: Sumitomo Electric Industries, Ltd.
Claims (1)
とプラスチックの押出し加工による被覆層を順に連続的
に施し、さらに、上記鋼より線の素線間の隙間に上記経
時硬化性樹脂を流入させて成る高耐食性ＰＣ鋼より線。(1) A layer of time-curing resin applied and a coating layer formed by extrusion of plastic are successively applied to the outer periphery of the steel stranded wire, and the time-curable resin is further applied to the gaps between the strands of the steel stranded wire. Highly corrosion resistant PC steel stranded wire made of inflow.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21928288A JPH0270852A (en) | 1988-09-01 | 1988-09-01 | High corrosion-resisting pc steel strand |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP21928288A JPH0270852A (en) | 1988-09-01 | 1988-09-01 | High corrosion-resisting pc steel strand |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0270852A true JPH0270852A (en) | 1990-03-09 |
| JPH0543018B2 JPH0543018B2 (en) | 1993-06-30 |
Family
ID=16733069
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP21928288A Granted JPH0270852A (en) | 1988-09-01 | 1988-09-01 | High corrosion-resisting pc steel strand |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0270852A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100513357B1 (en) * | 2000-12-04 | 2005-09-07 | 프레이씨네 엥떼르나씨오날(에스떼위뻬) | Individually protected strand, its use in construction, and manufacturing process |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347609A (en) * | 1976-10-13 | 1978-04-28 | Katsuji Takayama | Device for preventing stanchion for elevated rail from sinking |
| JPS63167836A (en) * | 1986-12-28 | 1988-07-11 | 神鋼鋼線工業株式会社 | Tension material for prestressed concrete and use thereof |
-
1988
- 1988-09-01 JP JP21928288A patent/JPH0270852A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5347609A (en) * | 1976-10-13 | 1978-04-28 | Katsuji Takayama | Device for preventing stanchion for elevated rail from sinking |
| JPS63167836A (en) * | 1986-12-28 | 1988-07-11 | 神鋼鋼線工業株式会社 | Tension material for prestressed concrete and use thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100513357B1 (en) * | 2000-12-04 | 2005-09-07 | 프레이씨네 엥떼르나씨오날(에스떼위뻬) | Individually protected strand, its use in construction, and manufacturing process |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0543018B2 (en) | 1993-06-30 |
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