JP2852218B2 - Tension material - Google Patents
Tension materialInfo
- Publication number
- JP2852218B2 JP2852218B2 JP7302632A JP30263295A JP2852218B2 JP 2852218 B2 JP2852218 B2 JP 2852218B2 JP 7302632 A JP7302632 A JP 7302632A JP 30263295 A JP30263295 A JP 30263295A JP 2852218 B2 JP2852218 B2 JP 2852218B2
- Authority
- JP
- Japan
- Prior art keywords
- tendon
- wire
- spacer
- coating
- steel
- 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
Classifications
-
- D—TEXTILES; PAPER
- D07—ROPES; CABLES OTHER THAN ELECTRIC
- D07B—ROPES OR CABLES IN GENERAL
- D07B5/00—Making ropes or cables from special materials or of particular form
- D07B5/005—Making ropes or cables from special materials or of particular form characterised by their outer shape or surface properties
-
- 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
- D07B2201/2071—Spacers
- D07B2201/2074—Spacers in radial direction
Landscapes
- Reinforcement Elements For Buildings (AREA)
- Ropes Or Cables (AREA)
Description
【０００１】[0001]
【発明の属する技術分野】本発明はグラウンドアンカー
工法に用いられる緊張材であり、定着長部におけるコン
クリートとの付着強度を大きくする緊張材に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tendon used for a ground anchor construction method, and more particularly to a tendon which increases the strength of adhesion to concrete at a fixing length portion.
【０００２】[0002]
【従来の技術】グラウンドアンカー工法を大別すると付
着形アンカー工法と、支圧形アンカー工法とがある。付
着形アンカー工法の場合、ＰＣ鋼より線とコンクリート
との付着を利用してプレストレスを付与するものであ
り、これに対して支圧形アンカー工法の場合は種々の形
状の定着具をＰＣ鋼より線の先端部に取り付け、前記定
着具とコンクリートとの付着を利用してプレストレスを
付与するものである。2. Description of the Related Art Ground anchoring methods are roughly classified into an attachment type anchoring method and a bearing type anchoring method. In the case of the adhesive anchor method, prestress is applied by using the adhesion between the PC steel strand and the concrete. In contrast, in the case of the bearing anchor method, various shapes of fixing tools are used. The pre-stress is attached to the tip of the stranded wire by utilizing the adhesion between the fixing tool and concrete.
【０００３】[0003]
【発明が解決しようとする課題】このような付着形アン
カー工法と支圧形アンカー工法とを比較すると、支圧形
アンカー工法の方が安定性に優れているが、その反面、
定着具の費用、組立・取付費用、施工費用等が加算され
るため付着形アンカー工法よりも割高となる問題があっ
た。Comparing such an attachment type anchoring method and a bearing type anchoring method, the bearing type anchoring method is more excellent in stability.
There is a problem that the cost of the fixing tool, the assembly / installation cost, the construction cost, and the like are added, so that the cost is higher than that of the adhesive anchor method.
【０００４】本発明はＰＣ鋼より線の解きほぐし及びよ
り合わせが容易であることに着目して、定着具を用いる
ことなく緊張材のコンクリートとの付着強度を大きくす
ることである。The present invention focuses on the fact that the unraveling and twisting of PC steel strands is easy, and an object of the present invention is to increase the adhesive strength of the tendon to concrete without using a fixing tool.
【０００５】[0005]
【課題を解決するための手段】以上の課題を解決するた
めの本発明の緊張材は、請求項１の発明が、外周に合成
樹脂粉末塗料が溶融密着されて被覆内層が形成された芯
線および側線からなるＰＣ鋼より線が使用され、該ＰＣ
鋼より線における定着長部の一部が解きほぐされて前記
芯線にスペーサーが差し込まれ、該スペーサの外周で前
記側線が押し広げらて膨張部が形成されたことを特徴と
する。また、請求項項２の発明が、請求項１において、
前記膨張部は適宜間隔ごとに複数設けられたことを特徴
とする。 Tendons of the present invention to solve the above object, according to an aspect of the inventions of claim 1, synthesized in the outer periphery
A core with a coating inner layer formed by melting and adhesion of resin powder paint
A PC steel stranded wire consisting of a wire and a side wire is used.
Part of the anchorage length of the steel strand is unraveled and
A spacer is inserted into the core wire, and
The side line is pushed out to form an inflated part.
I do. The invention according to claim 2 is based on claim 1,
A plurality of the inflatable portions are provided at appropriate intervals.
And
【０００６】[0006]
【実施例】以下、本発明の緊張材の実施の形態の一例を
図面に基づいて詳細に説明する。図１は本発明の緊張材
の正面図、図２はＰＣ鋼線の先端部を解きほぐした状態
の正面図、図３の（１）〜（５）は緊張材の横断面図で
ある。BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of a tendon according to the present invention. FIG. 1 is a front view of the tendon of the present invention, FIG. 2 is a front view of a state in which the tip of a PC steel wire is unraveled, and FIGS. 3 (1) to (5) are cross-sectional views of the tendon.
【０００７】緊張材１は、図１に示すように、ＰＣ鋼よ
り線２の先端部の解きほぐし部３の芯線４に円形のスぺ
ーサ６が挿入されて側線５が押し広げられ、前記解きほ
ぐし部３の先端部がより合わされ、該より合わせ部７の
先端部に樹脂管８が挿入され、その上からバンド９で結
束されることによってまゆ形状の膨張部１０が形成され
ている。As shown in FIG. 1, a circular spacer 6 is inserted into the core wire 4 of the unraveling portion 3 at the end of the PC steel stranded wire 2 so that the side wire 5 is spread out, as shown in FIG. The tip of the portion 3 is twisted, the resin tube 8 is inserted into the tip of the twisting portion 7, and bound with a band 9 from above, thereby forming a cocoon-shaped inflatable portion 10.
【０００８】ＰＣ鋼より線２は先端部を解きほぐすと、
図２に示すような形状に解きほぐされるので、その解き
ほぐし部３にスペーサ６を挿入すると上記のようなまゆ
形状の膨張部１０が形成される。When the tip of the PC steel stranded wire 2 is loosened,
Since it is unraveled into the shape as shown in FIG. 2, when the spacer 6 is inserted into the unraveling part 3, the above-mentioned cocoon-shaped expansion part 10 is formed.
【０００９】またスペーサ６は合成樹脂製の円板であ
り、外周面で側線５を芯線４の周囲に押し広げるもので
あるが、図２の（２）に示すように、外周面に嵌め合い
用の凹溝６ａを設けることもできる。The spacer 6 is a disk made of a synthetic resin, and pushes the side line 5 around the core wire 4 on the outer peripheral surface. As shown in FIG. 2B, the spacer 6 is fitted on the outer peripheral surface. Groove 6a can be provided.
【００１０】このように緊張材１の定着長部１１にまゆ
形状の膨張部１０が形成されてコンクリートとの付着強
度を大きくするが、自由長部１２は合成樹脂製の外層筒
１３で被覆され、該外層筒１３とＰＣ鋼より線２との間
にはグリス等の滑剤１４が充填されている。As described above, the cocoon-shaped inflatable portion 10 is formed in the fixing length portion 11 of the tendon material 1 to increase the adhesion strength to concrete, but the free length portion 12 is covered with an outer layer cylinder 13 made of synthetic resin. A lubricant 14 such as grease is filled between the outer layer cylinder 13 and the PC steel strand 2.
【００１１】図４は、このような膨張部１０を備えた緊
張材１と、従来の緊張材との引き抜き試験の方法を示す
ものであり、この試験は下記に示す条件で行った。 （１）試験条件 （ａ）緊張材の埋め込み長さ ２０００ｍｍ （ｃ）供試体寸法 縦１００ｍｍ×横１００ｍ
ｍ×長さ２０００ｍｍ （ｄ）グラウト標準配合 Ｗ／Ｃ ４５％FIG. 4 shows a method of a pull-out test between the tendon 1 having such an expanding portion 10 and a conventional tendon. This test was performed under the following conditions. (1) Test conditions (a) Tendon embedding length 2000 mm (c) Specimen dimensions 100 mm long x 100 m wide
mx length 2000mm (d) Grout standard blend W / C 45%
【表１】 （ｅ）供試体の圧縮強度 ３５０ｋｇｆ／ｃｍ2 （２）試験方法 図４に示すように、コンクリート供試体１５にＰＣ鋼よ
り線２を埋め込み、コンクリート供試体１５の圧縮強度
が３００ｋｇｆ／ｃｍ2以上になったら、測定器１６を
注視しながらセンターホールジャッキ１７によって荷重
を少しづつ上げていった。[Table 1] (E) Compressive strength of specimen 350 kgf / cm2 (2) Test method As shown in FIG. 4, a PC steel strand 2 is embedded in a concrete specimen 15, and the compressive strength of the concrete specimen 15 becomes 300 kgf / cm2 or more. Then, the load was gradually increased by the center hole jack 17 while gazing at the measuring device 16.
【００１２】その結果、下記の表２に示すように、本発
明の緊張材１は途中で破断をしても引き抜けなかった
が、従来の緊張材は約１１トンで引き抜けた。したがっ
て、後述する本発明の緊張材１の効果を確認することが
できた。As a result, as shown in Table 2 below, the tendon 1 of the present invention did not pull out even if it was broken in the middle, but the conventional tendon pulled out at about 11 tons. Therefore, the effect of the tendon 1 of the present invention described later could be confirmed.
【表２】 [Table 2]
【００１３】図５は、２つの膨張部１０を設けた緊張材
１を示したものである。これらの２つの膨張部１０の間
は、先端部のようにバンド９で締め付けることもでき
る。このような緊張材１はコンクリートとの付着強度を
さらに高めることができる。なお、この膨張部１０の数
は上記のような１つ又は２つに限定されるものではな
く、設置場所に応じて決定するものとする。FIG. 5 shows a tension member 1 provided with two inflatable portions 10. The band 9 can be fastened between the two inflatable portions 10 like a tip. Such a tendon 1 can further increase the adhesive strength to concrete. Note that the number of the inflatable portions 10 is not limited to one or two as described above, and is determined according to the installation location.
【００１４】また図６は裸のＰＣ鋼より線２の芯線４及
び側線５の外周に合成樹脂粉末塗料を溶融密着させた被
覆内層１８を形成したものであり、これにより略完全に
防錆処理が施せたので錆の発生を防いで品質の向上を図
るとともに、コンクリートとの付着力を向上させること
もできる。この被覆内層１８が形成された自由長部１２
はグリス等の滑剤１４を介して被覆外層筒２０で被覆さ
れている。FIG. 6 shows a coating inner layer 18 in which a synthetic resin powder coating is melted and adhered to the outer periphery of the core wire 4 and the side wire 5 of the bare PC stranded wire 2, thereby substantially completely preventing rusting. As a result, it is possible to prevent the generation of rust and to improve the quality, and also to improve the adhesion to concrete. The free length portion 12 on which the coating inner layer 18 is formed
Is covered with a coating outer layer cylinder 20 via a lubricant 14 such as grease.
【００１５】また図８は自由長部１２における芯線４及
び側線５の被覆内層１８の外周に被覆中層筒１９及び被
覆外層筒２０とを形成し、これらの被覆中層筒１９と被
覆外層筒２０との間にグリス等の滑剤１４が充填された
ものであり、被覆中層筒１９は被覆内層１８に対して溶
着しない剥離しやすい材料としているので、先端部分の
剥離作業が容易となって定着長部１１が容易に形成でき
る。FIG. 8 shows a coating middle cylinder 19 and a coating outer cylinder 20 formed on the outer periphery of the coating inner layer 18 of the core wire 4 and the side wire 5 in the free length portion 12. The middle coating layer tube 19 is made of a material which does not weld to the coating inner layer 18 and is easily peeled, so that the leading end portion can be easily peeled off and the fixing length portion is formed. 11 can be easily formed.
【００１６】[0016]
【発明の効果】外周に合成樹脂粉末塗料が溶融密着され
て被覆内層が形成された芯線および側線からなるＰＣ鋼
より線が使用され、該ＰＣ鋼より線における定着長部の
一部が解きほぐされて前記芯線にスペーサーが差し込ま
れ、該スペーサの外周で前記側線が押し広げらて膨張部
が形成されたことにより、他の定着具を用いることなく
コンクリートとの付着強度を大きくすることができる。
また、スペーサの外周で側線が押し広げらて膨張部が形
成されたことにより、前記スペーサが側線より外側に出
ることがない。 According to the present invention , the synthetic resin powder coating is melted and adhered to the outer periphery.
Steel consisting of core wire and side wire with coating inner layer formed
Stranded wire is used, and the fixing length of the PC steel stranded wire is
Partially unraveled and a spacer inserted into the core wire
The side line is pushed out around the outer periphery of the spacer, and the expanded portion
Is formed , the adhesion strength to concrete can be increased without using another fixing device.
In addition, the side line is pushed out at the outer periphery of the spacer, and the inflated part is formed.
With this configuration, the spacer extends outside the side line.
Never.
【００１７】緊張材における膨張部を適宜間隔ごとに複
数設けたことにより、コンクリートとの付着強度をさら
に大きくすることができる。By providing a plurality of expansion portions in the tension member at appropriate intervals, the adhesive strength to concrete can be further increased.
【００１８】ＰＣ鋼より線の芯線及び側線の外周には合
成樹脂粉末塗料を溶融密着させた被覆内層が形成された
ことにより、ＰＣ鋼より線に錆を発生させずに品質の向
上を図ることができるとともに、コンクリートとの付着
力も向上させることができる。[0018] By forming a coating inner layer in which a synthetic resin powder coating is melted and adhered to the outer periphery of the core wire and side wire of the PC steel stranded wire, the quality is improved without causing rust on the PC steel stranded wire. And the adhesion to concrete can be improved.
【００１９】[0019]
【図１】緊張材の正面図である。FIG. 1 is a front view of a tendon.
【図２】先端部を解きほぐした緊張材の正面図である。FIG. 2 is a front view of a tendon in which a distal end is loosened.
【図３】（１）及び（２）は図１のＡ−Ａ線断面図、
（３）は同Ｂ−Ｂ線断面図、（４）は同Ｃ−Ｃ線断面
図、（５）は同Ｄ−Ｄ線断面図である。FIGS. 3 (1) and (2) are cross-sectional views taken along line AA of FIG. 1;
(3) is a sectional view taken along the line BB, (4) is a sectional view taken along the line CC, and (5) is a sectional view taken along the line DD.
【図４】緊張材をコンクリート供試体に埋設して引張試
験をしている平面図である。FIG. 4 is a plan view in which a tension member is embedded in a concrete specimen to perform a tensile test.
【図５】他の緊張材の正面図である。FIG. 5 is a front view of another tendon.
【図６】他の緊張材の正面図である。FIG. 6 is a front view of another tendon.
【図７】（１）は図６のＥ−Ｅ線断面図、（２）は同Ｆ
−Ｆ線断面図、（３）は同Ｇ−Ｇ線断面図である。7A is a sectional view taken along line EE of FIG. 6, and FIG.
FIG. 3 is a cross-sectional view taken along a line F in FIG.
【図８】（１）は他の緊張材の正面図、（２）は（１）
のＨ−Ｈ線断面図である。FIG. 8 (1) is a front view of another tendon, and (2) is (1).
FIG. 3 is a sectional view taken along line HH of FIG.
１ 緊張材 ２ ＰＣ鋼より線 ３ 解きほぐし部 ４ 芯線 ５ 側線 ６ スペーサ ７ より合わせ部 １０ 膨張部 １１ 定着長部 １２ 自由長部 １３ 外層筒 １４ 滑剤 １８ 被覆内層 １９ 被覆中層筒 ２０ 被覆外層筒 DESCRIPTION OF SYMBOLS 1 Tensile material 2 PC steel wire 3 Unraveling part 4 Core wire 5 Side wire 6 Spacer 7 Twisting part 10 Expansion part 11 Fixing length part 12 Free length part 13 Outer cylinder 14 Lubricant 18 Coating inner layer 19 Coating middle layer cylinder 20 Coating outer layer cylinder
Claims (2)
て被覆内層が形成された芯線および側線からなるＰＣ鋼
より線が使用され、該ＰＣ鋼より線における定着長部の
一部が解きほぐされて前記芯線にスペーサーが差し込ま
れ、該スペーサの外周で前記側線が押し広げらて膨張部
が形成されたことを特徴とする緊張材。1. A synthetic resin powder coating is melted and adhered to the outer periphery.
Steel consisting of core wire and side wire with coating inner layer formed
Stranded wire is used, and the fixing length of the PC steel stranded wire is
Partially unraveled and a spacer inserted into the core wire
The side line is pushed out around the outer periphery of the spacer, and the expanded portion
A tendon, characterized by having formed thereon .
れたことを特徴とする請求項１に記載の緊張材。2. A plurality of inflatable portions are provided at appropriate intervals .
The tendon according to claim 1, wherein the tension member is provided.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7302632A JP2852218B2 (en) | 1995-11-21 | 1995-11-21 | Tension material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7302632A JP2852218B2 (en) | 1995-11-21 | 1995-11-21 | Tension material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09144211A JPH09144211A (en) | 1997-06-03 |
| JP2852218B2 true JP2852218B2 (en) | 1999-01-27 |
Family
ID=17911328
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7302632A Expired - Fee Related JP2852218B2 (en) | 1995-11-21 | 1995-11-21 | Tension material |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2852218B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR200315925Y1 (en) * | 2003-02-28 | 2003-06-12 | 주식회사 삼우기초기술 | Waterproof structure of covered tension member for permanent ground anchor |
| JP7026601B2 (en) * | 2018-10-30 | 2022-02-28 | 東京製綱株式会社 | Prestressed concrete girder and prestress introduction method |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5223818A (en) * | 1975-08-18 | 1977-02-23 | Jirou Abe | Fixation device of pc steel wire by means of twist wire |
| JPS61144121U (en) * | 1985-02-25 | 1986-09-05 | ||
| JPS63219723A (en) * | 1987-03-10 | 1988-09-13 | Taisei Corp | Processor for tension member to be used in earth anchor |
| JPH04368549A (en) * | 1991-06-18 | 1992-12-21 | Mitsui Constr Co Ltd | Material for structure |
| JP2552604B2 (en) * | 1992-01-30 | 1996-11-13 | 黒沢建設株式会社 | Method for forming synthetic resin coating on PC steel strand and PC strand formed with synthetic resin coating |
| JPH06322893A (en) * | 1993-05-18 | 1994-11-22 | Nippon Steel Corp | Method and device for fixing continuous fiber reinforced plastic stranded wire |
-
1995
- 1995-11-21 JP JP7302632A patent/JP2852218B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH09144211A (en) | 1997-06-03 |
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