JP2006090049A - Pc steel stranded wire - Google Patents

Pc steel stranded wire Download PDF

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Publication number
JP2006090049A
JP2006090049A JP2004278383A JP2004278383A JP2006090049A JP 2006090049 A JP2006090049 A JP 2006090049A JP 2004278383 A JP2004278383 A JP 2004278383A JP 2004278383 A JP2004278383 A JP 2004278383A JP 2006090049 A JP2006090049 A JP 2006090049A
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wire
grout
diameter
steel stranded
core wire
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Masato Yamada
眞人 山田
Motoyasu Nishino
元庸 西野
Yoshiyuki Matsubara
喜之 松原
Minoru Sakinaka
稔 崎中
Yoshihiko Higashida
義彦 東田
Takashi Ichiki
隆志 市来
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Sumitomo SEI Steel Wire Corp
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Sumitomo SEI Steel Wire Corp
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a PC steel strand capable of enhancing the filling property of grout, and a concrete structure using the PC steel stranded cable. <P>SOLUTION: This PC steel stranded cable 1 is obtained by twisting a core wire 10 and a plurality of side wires 11 together. The PC steel stranded cable 1 satisfies inequality (1), 0.13<d<SB>1</SB>-d<SB>2</SB>≤1.8, when a reference diameter (d<SB>1</SB>+2d<SB>2</SB>) is in the range of 12.0-13.1 mm, and satisfies an inequality (2), 0.2<d<SB>1</SB>-d<SB>2</SB>≤2.0, when the reference diameter (d<SB>1</SB>+2d<SB>2</SB>) is in the range of 15.0-16.0 mm. In inequality (1) and inequality (2), d<SB>1</SB>represents the diameter of the core wire, and d<SB>2</SB>represents the diameter of the side wire. A sufficient gap 12 is provided between the side wires by using the side wire wherein a difference between the diameter of the core wire and that of the side wire is set to be in a specified range. Thus, when the grout is infilled, it spreads all over the surface of the core wire and that of the side wire, so as to enhance anticorrosion properties. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、芯線と複数の側線とを撚り合わされたPC鋼撚り線、及びこのPC鋼撚り線を用いたコンクリート構造物に関するものである。特に、グラウトの充填性に優れるPC鋼撚り線に関するものである。   The present invention relates to a PC steel stranded wire obtained by twisting a core wire and a plurality of side wires, and a concrete structure using the PC steel stranded wire. In particular, the present invention relates to a PC steel stranded wire excellent in grout filling.

従来、プレストレストコンクリート構造物に使用するポストテンション工法では、予めコンクリート構造物内に配置されたシースにPC鋼撚り線を挿入し、所定の荷重まで緊張した後、シース内にセメントグラウトを注入する。このグラウトは、構造物が供用されたときにPC鋼撚り線と構造物とが一体になって挙動するようにPC鋼撚り線と構造物とを付着させると共に、外部の環境からPC鋼撚り線を保護して防食するために用いられる。   Conventionally, in the post-tension method used for a prestressed concrete structure, a PC steel stranded wire is inserted into a sheath previously arranged in the concrete structure, and after tensioning to a predetermined load, cement grout is injected into the sheath. This grout attaches the PC steel strand and the structure so that the PC steel strand and the structure behave as a unit when the structure is put into service, and the PC steel strand from the external environment. Used to protect and protect against corrosion.

上記ポストテンション工法に用いられるPC鋼撚り線としては、図3(A)に示すような外周に被覆のない裸のPC鋼撚り線100が知られている。図3(A)は、従来のPC鋼撚り線の断面図、(B)は、このPC鋼撚り線を用いたコンクリート構造物の断面図である。PC鋼撚り線100は、1本の芯線101と、6本の側線102との合計7本の素線を撚り合わせた形態のものである。7本撚りのPC鋼撚り線には、例えば、標準径r(芯線101の径d1＋側線102の径d2×2)が12.7mm、15.2mmなどといったものがある。標準径rが15.2mmのPC鋼撚り線では、芯線101の径d1：5.2mm、側線102の径d2：5.0mmのものがよく用いられている(例えば、特許文献1参照)。 As a PC steel stranded wire used in the post-tension method, a bare PC steel stranded wire 100 having no outer coating as shown in FIG. 3 (A) is known. FIG. 3 (A) is a cross-sectional view of a conventional PC steel stranded wire, and FIG. 3 (B) is a cross-sectional view of a concrete structure using this PC steel stranded wire. The PC steel stranded wire 100 has a form in which a total of seven strands of one core wire 101 and six side wires 102 are twisted together. Examples of the seven-stranded PC steel stranded wire include a standard diameter r (a diameter d 1 of the core wire 101 + a diameter d 2 × 2 of the side wire 102) of 12.7 mm, 15.2 mm, and the like. Of the PC steel stranded wires having a standard diameter r of 15.2 mm, core wires 101 having a diameter d 1 of 5.2 mm and side wires 102 having a diameter d 2 of 5.0 mm are often used (see, for example, Patent Document 1).

特開2002-81169号公報、段落0039JP 2002-81169, paragraph 0039

しかし、上記従来のPC鋼撚り線では、芯線と側線との径差(d1−d2)が小さいことから、図3(A)に示すように側線102間にほとんど隙間がないように撚り合わされる。そのため、コンクリート構造物200に配置されたシース201にPC鋼撚り線100を挿入した後、シース201内にグラウト202を充填しても、図3(B)に示すように側線と芯線とで囲まれる領域(図3において領域A)にグラウト202が十分に充填されないことがある。また、PC鋼撚り線の配置形態によっては、特に鉛直方向成分が生じるような配置の場合、具体的には、芯線の軸線が水平方向に対して傾斜した状態で配置される場合、グラウト材料の水分が分離されて、細い隙間を移動し、グラウトが充填されない領域が生じることがあり、上記のように素線の周方向だけでなく長手方向においてもグラウトが十分に充填されないことがある。グラウトは、上記のようにPC鋼撚り線と構造物間の付着だけでなく、PC鋼撚り線に対して防食剤として機能する。従って、芯線や側線の表面がグラウトに接触していない領域では、素線の表面にアルカリ不動態被膜が形成されず、腐食が生じ易くなる。 However, in the conventional PC steel stranded wire, since the diameter difference (d 1 -d 2 ) between the core wire and the side wire is small, the stranded wire is hardly twisted between the side wires 102 as shown in FIG. Combined. Therefore, even after inserting the PC steel stranded wire 100 into the sheath 201 arranged in the concrete structure 200 and then filling the grout 202 in the sheath 201, the side wire and the core wire are surrounded as shown in FIG. In some cases, the grout 202 may not be sufficiently filled in the region (region A in FIG. 3). Further, depending on the arrangement form of the PC steel stranded wire, particularly in the arrangement in which the vertical component is generated, specifically, in the case where the axis of the core wire is arranged in a state inclined with respect to the horizontal direction, the grout material In some cases, the moisture is separated and moves through a narrow gap and a region where the grout is not filled may be generated. As described above, the grout may not be sufficiently filled not only in the circumferential direction but also in the longitudinal direction. The grout not only adheres between the PC steel strand and the structure as described above, but also functions as an anticorrosive for the PC steel strand. Accordingly, in the region where the surface of the core wire or the side wire is not in contact with the grout, the alkali passive film is not formed on the surface of the wire, and corrosion easily occurs.

そこで、本発明の主目的は、素線の周方向や長手方向においてグラウトの充填性を向上することができるPC鋼撚り線を提供することにある。また、本発明の他の目的は、上記グラウトの充填性に優れるPC鋼撚り線を用いたコンクリート構造物を提供することにある。   Therefore, a main object of the present invention is to provide a PC steel stranded wire capable of improving grout filling in the circumferential direction and longitudinal direction of the strand. Another object of the present invention is to provide a concrete structure using a PC steel stranded wire having excellent grout filling properties.

本発明は、側線間に隙間を設けることで上記の目的を達成する。即ち、本発明は、1本の芯線と6本の側線とを撚り合わされた7本撚りのPC鋼撚り線であって、芯線の径をd1、側線の径をd2とするとき、以下を満たすことを特徴とする。
(1) 標準径(d1＋2d2)が12.0mm以上13.1mm以下のとき、0.13＜d1−d2≦1.8
(2) 標準径(d1＋2d2)が15.0mm以上16.0mm以下のとき、0.2＜d1−d2≦2.0 The present invention achieves the above object by providing a gap between the side lines. That is, the present invention is a seven-strand PC steel stranded wire in which one core wire and six side wires are twisted together, and when the core wire diameter is d 1 and the side wire diameter is d 2 , It is characterized by satisfying.
(1) When the standard diameter (d 1 + 2d 2 ) is 12.0 mm or more and 13.1 mm or less, 0.13 <d 1 −d 2 ≦ 1.8
(2) When the standard diameter (d 1 + 2d 2 ) is 15.0 mm or more and 16.0 mm or less, 0.2 <d 1 −d 2 ≦ 2.0

7本撚りのPC鋼撚り線の標準径(d1＋2d2)は、JISに規定されており、(1)12.7mm＋0.4mm、12.7mm−0.2mm、(2)15.2mm＋0.4mm、15.2mm−0.2mmである(JIS G 3536参照)。また、上記(1)、(2)のいずれの径においても、d1−d2≧0.08、引張荷重が(1)標準径12.7mmのとき、183kN以上、(2)標準径15.2mmのとき、261kN以上であることが同様にJISに規定されている。従来、これらJIS規格を満たすべく、標準径12.7mmの場合、芯線径d1：4.35mm、側線径d2：4.22mm、d1−d2＝0.13mm、引張強度190kN、標準径15.2mmの場合、芯線径d1：5.25mm、側線径d2：5.05mm、d1−d2＝0.2mm、引張強度271kNのPC鋼撚り線が用いられていた。しかし、芯線径と側線径との差が上記のように小さい場合、芯線と側線とを撚り合わせると、側線間にほとんど隙間ができず、芯線と二本の側線とでつくられる領域にグラウトが十分に充填されない恐れがある。また、PC鋼撚り線が鉛直方向成分を有する状態で配置された場合、上記領域が狭いことでグラウトから分離した水分の鉛直方向上方への移動ドレーンとして機能することにより、グラウトの材料分離により、長手方向においてグラウトが充填されない箇所が生じる恐れがある。PC鋼撚り線が鉛直方向成分を有するように配置された際、上記芯線と側線とでつくられる領域が狭いと、液頭圧によりグラウトから水分のみが絞り出され、この水分が上記領域を伝って鉛直方向上方に送り出される。このようなグラウト材料の分離により、PC鋼撚り線の長手方向において、適正なグラウトが充填されない領域が生じることがある。 Standard diameter (d 1 + 2d 2 ) of 7-stranded PC steel stranded wire is stipulated in JIS, (1) 12.7mm + 0.4mm, 12.7mm-0.2mm, (2) 15.2mm + 0.4mm, 15.2mm -0.2 mm (see JIS G 3536). In any of the above diameters (1) and (2), d 1 −d 2 ≧ 0.08, when the tensile load is (1) standard diameter 12.7 mm, 183 kN or more, (2) standard diameter 15.2 mm 261 kN or more is also stipulated in JIS. Conventionally, in order to satisfy these JIS standards, when the standard diameter is 12.7 mm, the core wire diameter d 1 : 4.35 mm, the side wire diameter d 2 : 4.22 mm, d 1 −d 2 = 0.13 mm, the tensile strength 190 kN, the standard diameter 15.2 mm In this case, a PC steel stranded wire having a core wire diameter d 1 : 5.25 mm, a side wire diameter d 2 : 5.05 mm, d 1 -d 2 = 0.2 mm, and a tensile strength of 271 kN was used. However, when the difference between the core wire diameter and the side wire diameter is small as described above, when the core wire and the side wire are twisted together, there is almost no gap between the side wires, and there is a grout in the region formed by the core wire and the two side wires. There is a risk of not being fully filled. In addition, when the PC steel stranded wire is arranged in a state having a vertical component, it functions as a moving drain upward in the vertical direction of moisture separated from the grout because the region is narrow, by separating the material of the grout, There is a possibility that a portion where the grout is not filled in the longitudinal direction is generated. When the PC steel strands are arranged so as to have a vertical component, if the area formed by the core wire and the side line is narrow, only the moisture is squeezed out of the grout by the liquid head pressure, and this moisture passes through the area. Then, it is sent out vertically upward. Such separation of the grout material may cause a region that is not filled with proper grout in the longitudinal direction of the PC steel stranded wire.

そこで、本発明者らは、種々検討した結果、必要な引張強度を具えながら、PC鋼撚り線を形成する素線の周方向や長手方向におけるグラウトの充填性を向上するべく、側線間に十分な隙間を設けることができるように芯線径と側線径とを規定するものである。   Therefore, as a result of various investigations, the present inventors have found that sufficient tensile strength is provided, and the gap between the side wires is sufficient to improve grout filling in the circumferential direction and longitudinal direction of the strands forming the PC steel stranded wire. The core wire diameter and the side wire diameter are defined so that a sufficient gap can be provided.

標準径(d1＋2d2)を12.7mm＋0.4mm、12.7mm−0.7mm、即ち、12.0mm以上13.1mm以下とする場合、芯線径d1と側線径d2との差：d1−d2が0.13mm以下では、十分な引張強度を具えているが、側線間に設ける隙間が十分でなく、グラウトの充填性を向上できない。d1−d2が1.8mm超では、側線間に十分な隙間を設けて、グラウトの充填性を向上できるが、引張強度が不十分となる。同様に、標準径(d1＋2d2)を15.2mm＋0.8mm、15.2mm−0.2mm、即ち、15.0mm以上16.0mm以下とする場合、芯線径d1と側線径d2との差：d1−d2が0.2mm以下では、引張強度に優れるが、グラウトの充填性を向上できない。d1−d2が2.0mm超では、グラウトの充填性を向上できるが、引張強度が不十分となる。 When the standard diameter (d 1 + 2d 2 ) is 12.7 mm + 0.4 mm, 12.7 mm-0.7 mm, that is, 12.0 mm or more and 13.1 mm or less, the difference between the core wire diameter d 1 and the side wire diameter d 2 : d 1 -d 2 If it is 0.13 mm or less, sufficient tensile strength is provided, but the gap provided between the side lines is not sufficient, and the grout filling ability cannot be improved. If d 1 -d 2 is more than 1.8 mm, a sufficient gap can be provided between the side lines to improve the grout filling property, but the tensile strength becomes insufficient. Similarly, when the standard diameter (d 1 + 2d 2 ) is 15.2 mm + 0.8 mm, 15.2 mm−0.2 mm, ie, 15.0 mm to 16.0 mm, the difference between the core wire diameter d 1 and the side wire diameter d 2 : d 1 When −d 2 is 0.2 mm or less, the tensile strength is excellent, but the grout filling ability cannot be improved. When d 1 -d 2 exceeds 2.0 mm, the grout filling property can be improved, but the tensile strength becomes insufficient.

そして、本発明では、上記のように従来よりも細めの側線を用い、側線間にグラウトが行き渡りやすいように、側線間に十分な隙間が設けられるように撚り合わせる。即ち、本発明PC鋼撚り線1は、図1に示すように芯線10の外周に側線11が配置され、側線11間に適切な隙間12が設けられている。このように芯線との径差が上記特定の範囲となる側線を用い、側線間にグラウトが行き渡るのに十分な隙間を設けることで、グラウトを充填した際、芯線や側線の表面にグラウトが行き渡り、防食性を向上させることができる。また、側線間に十分な隙間を設けることで、液頭圧によるグラウト材料の分離も低減することができ、PC鋼撚り線の長手方向においてもグラウトを十分に行き渡らせることができる。   And in this invention, it twists so that a sufficient clearance gap may be provided between side lines so that it may be easy to spread grout between side lines as mentioned above using a thinner side line than before. That is, in the PC steel stranded wire 1 of the present invention, as shown in FIG. 1, the side wires 11 are arranged on the outer periphery of the core wire 10, and appropriate gaps 12 are provided between the side wires 11. In this way, by using a side line whose diameter difference from the core wire is within the above specific range and providing a sufficient gap for the grout to spread between the side lines, when grout is filled, the grout spreads on the surface of the core wire or the side line. , Anticorrosion can be improved. Further, by providing a sufficient gap between the side wires, it is possible to reduce the separation of the grout material due to the liquid head pressure, and it is possible to sufficiently spread the grout even in the longitudinal direction of the PC steel stranded wire.

本発明に用いる芯線及び側線は、従来と同様の組成で、従来と同様に製造したものを用いてもよい。具体的な組成は、例えば、JIS G 3502に規定されているものが挙げられる。そして、上記組成の線材にパテンティングを行った後、冷間加工した線材を撚り合せ、残留ひずみを除去するべくブルーイングを施し、得られた素線を撚り合わせることで本発明PC鋼撚り線が得られる。特に、上記のように側線間に隙間を空けて素線を撚り合わせるには、例えば、各素線にブルーイングを施す前に、プレフォームローラなどを用いて適宜型付けを行うことが挙げられる。本発明PC鋼撚り線は、1本の芯線と、側線6本とを合わせて7本撚りとすることが好適である。   The core wire and the side wire used in the present invention may have the same composition as the conventional one and the one manufactured in the same manner as the conventional one. Specific examples of the composition include those specified in JIS G 3502. Then, after patenting the wire having the above composition, the cold-worked wire is twisted, subjected to bluing to remove residual strain, and the obtained strand is twisted to twist the obtained PC steel stranded wire Is obtained. In particular, in order to twist the strands with the gaps between the side wires as described above, for example, before applying blueing to each strand, performing appropriate molding using a preform roller or the like. The PC steel stranded wire of the present invention is preferably composed of a single core wire and six side wires to be a seven strand.

以上、説明したように本発明PC鋼撚り線によれば、芯線との径差が特定の大きさである側線を用い、側線間に適切な隙間を設けることで、側線の外周にグラウトが十分に行き渡り、グラウトの充填性を向上することができるという優れた効果を奏し得る。また、本発明PC鋼撚り線は、鉛直方向成分を有するように配置されても、上記隙間から水分のみが鉛直方向上方に送り出されてグラウトが材料分離を起こすことを防止し、撚り線長手方向においてもグラウトが十分に充填される。従って、本発明PC鋼撚り線では、グラウトの充填後において空気に曝される領域を低減し、或いは全く無くすことで撚り線の端部から水分や有害物質などの侵入を防止して、防食性を向上させることができる。このようなPC鋼撚り線を用いた本発明コンクリート構造物も非常に防食性に優れたものである。   As described above, according to the PC steel stranded wire of the present invention, a side wire having a specific difference in diameter from the core wire is used, and an appropriate gap is provided between the side wires, so that the grout is sufficient on the outer periphery of the side wire. It is possible to achieve an excellent effect that the grout filling ability can be improved. In addition, even if the PC steel stranded wire of the present invention is arranged to have a vertical component, only moisture is sent out vertically from the gap to prevent the grout from causing material separation, and the longitudinal direction of the stranded wire In this case, the grout is sufficiently filled. Therefore, in the PC steel stranded wire of the present invention, the area exposed to air after filling with grout is reduced or completely eliminated to prevent intrusion of moisture and harmful substances from the end of the stranded wire, thereby preventing corrosion. Can be improved. The concrete structure of the present invention using such a PC steel stranded wire is also very excellent in corrosion resistance.

以下、本発明の実施の形態を説明する。   Embodiments of the present invention will be described below.

JIS G 3502のSWRS72Bの線材にパテンティングを施し、径d1が5.2mmの素線(芯線)と、芯線との径の差(d1−d2)が表1に示す数値となる径d2の素線(側線)を複数作製した。そして、1本の芯線と6本の同一径の側線とを撚り合わせてブルーイングを施し、芯線と側線の径が異なる7本撚りのPC鋼撚り線(標準径r：10.6mm〜15.2mm)を得た。d1−d2＞0.2となる試料No.1-2〜1-8は、ブルーイング前にプレフォームローラを用いて、側線に予め型付けを施すことで、図1に示すように芯線10の外周に均等に側線11を配置し、側線11間に隙間12が設けられるように撚り合わせた。これら7本撚りのPC鋼撚り線の各試料について、JIS Z 2241による引張試験を行い、その破断荷重(kN)を測定した。また、各試料を無色透明のシース(長さ約2m)に挿入してシース内にグラウトを充填し、グラウトが硬化するまでの間にグラウトの分離状況を観察すると共に、グラウトが硬化した後任意の箇所で横方向において切断して、グラウトの充填状態を確認してみた。本試験においてシースは、水平方向に対し45°傾斜させてコンクリートに予め固定しておいたものを用いた。結果を表1に示す。 JIS G 3502 SWRS72B wire is subjected to patenting, and the difference in diameter (d 1 -d 2 ) between the strand (core wire) with a diameter d 1 of 5.2 mm and the core wire is the value shown in Table 1. A plurality of 2 strands (side wires) were produced. And one core wire and 6 side wires of the same diameter are twisted together to give blueing, and 7 strands of PC steel stranded wire with different core wire and side wire diameters (standard diameter r: 10.6mm to 15.2mm) Got. Sample Nos. 1-2 to 1-8 with d 1 −d 2 > 0.2 are pre-shaped using a preform roller before bluing. The side wires 11 were evenly arranged on the outer periphery, and twisted so that gaps 12 were provided between the side wires 11. A tensile test according to JIS Z 2241 was performed on each sample of these seven-stranded PC steel stranded wires, and the breaking load (kN) was measured. Also, insert each sample into a colorless and transparent sheath (about 2m in length), fill the sheath with grout, observe the state of grout separation before the grout hardens, and after the grout hardens, It cut | disconnected in the horizontal direction at the location of and checked the filling state of grout. In this test, a sheath that was previously fixed to concrete with an inclination of 45 ° with respect to the horizontal direction was used. The results are shown in Table 1.

Figure 2006090049
Figure 2006090049

表1において破断荷重は、265kN以上を満たすものを○、265kN未満のものを×とした。また、グラウト材料の分離状況は、PC鋼撚り線の上面において、ウォーターレンズの有無を評価した。グラウトの充填性は、断面において芯線と側線とがつくる領域にグラウトが十分に行き渡っているものを○、上記領域にグラウトが充填されていない箇所が一つでもあるものを×とした。   In Table 1, the breaking load was evaluated as ◯ when the load satisfied 265 kN or more, and X when less than 265 kN. In addition, the state of separation of the grout material was evaluated for the presence of a water lens on the upper surface of the PC steel stranded wire. As for the grout filling property, a case where the grout is sufficiently spread in a region formed by the core wire and the side line in the cross section is indicated by ◯, and a case where the region is not filled with the grout is indicated by ×.

表1に示すように0.2＜d1−d2≦2.0を満たす試料No.1-2〜1-6は、破断荷重265kN以上であった。また、これらの試料No.1-2〜1-6では、図2に示すようにコンクリート20に配置されたシース21内にグラウト22が十分に充填されており、特に、芯線10と側線11とがつくる領域13にグラウト22が十分に充填されていた。更に、これらの試料は、グラウトの硬化前において材料の分離が生じておらず、撚り線長手方向においても十分にグラウトが充填されていた。従って、これらの試料No.1-2〜1-6は、従来よりも防食性に優れると推測される。 As shown in Table 1, Sample Nos. 1-2 to 1-6 satisfying 0.2 <d 1 −d 2 ≦ 2.0 had a breaking load of 265 kN or more. Further, in these sample Nos. 1-2 to 1-6, as shown in FIG. 2, the grout 22 is sufficiently filled in the sheath 21 arranged in the concrete 20, and in particular, the core wire 10 and the side wire 11 The grout 22 was sufficiently filled in the region 13 formed by Furthermore, these samples had no material separation prior to the hardening of the grout, and were sufficiently filled with the grout in the longitudinal direction of the stranded wire. Therefore, these sample Nos. 1-2 to 1-6 are presumed to have better anticorrosion properties than before.

JIS G 3502のSWRS92Aの線材にパテンティングを施し、径d1が4.35mmの素線(芯線)と、芯線との径の差(d1−d2)が表2に示す数値となる径d2の素線(側線)を複数作製した。そして、1本の芯線と6本の同一径の側線とを撚り合わせてブルーイングを施し、側線の径が異なる7本撚りのPC鋼撚り線(標準径r：8.05mm〜12.79mm)を得た。d1−d2＞0.13となる試料No.2-2〜2-8は、ブルーイング前にプレフォームローラを用いて、側線に予め型付けを施すことで、図1に示すように芯線10の外周に均等に側線11を配置し、側線11間に隙間12が設けられるように撚り合わせた。これら7本撚りのPC鋼撚り線の各試料について、JIS Z 2241による引張試験を行い、その破断荷重(kN)を測定した。また、各試料を無色透明のシース(長さ約2m)に挿入してシース内にグラウトを充填し、グラウトが硬化するまでの間にグラウトの分離状況を観察すると共に、グラウトが硬化した後、任意の箇所で横方向に切断して、グラウトの充填状態を確認してみた。本試験においてシースは、水平方向に対し45°傾斜させて固定した。結果を表2に示す。 JIS G 3502 SWRS92A wire is patented, and the diameter d is the diameter d (d 1 -d 2 ) between the strand (core wire) whose diameter d 1 is 4.35 mm and the value shown in Table 2. A plurality of 2 strands (side wires) were produced. Then, one core wire and six side wires of the same diameter are twisted together and subjected to brewing to obtain a seven-strand PC steel stranded wire (standard diameter r: 8.05 mm to 12.79 mm) with different side wire diameters. It was. Sample Nos. 2-2 to 2-8, where d 1 −d 2 > 0.13, are pre-shaped using a preform roller before bluing, so that the side wire 10 is shaped as shown in FIG. The side wires 11 were evenly arranged on the outer periphery, and twisted so that gaps 12 were provided between the side wires 11. A tensile test according to JIS Z 2241 was performed on each sample of these seven-stranded PC steel stranded wires, and the breaking load (kN) was measured. In addition, each sample was inserted into a colorless and transparent sheath (length: about 2 m), filled with grout in the sheath, and the state of grout separation was observed until the grout was cured, and after the grout was cured, It cut | disconnected in the horizontal direction in arbitrary places, and the filling state of the grout was confirmed. In this test, the sheath was fixed at 45 ° with respect to the horizontal direction. The results are shown in Table 2.

Figure 2006090049
Figure 2006090049

表2において破断荷重は、183kN以上を満たすものを○、183kN未満のものを×とした。また、グラウト材料の分離状況は、PC鋼撚り線の上面において、ウォーターレンズの有無を評価した。グラウトの充填性は、断面において芯線と側線とがつくる領域にグラウトが十分に行き渡っているものを○、上記領域にグラウトが充填されていない箇所が一つでもあるものを×とした。   In Table 2, the breaking load is ◯ when it satisfies 183 kN or more, and × when it is less than 183 kN. In addition, the state of separation of the grout material was evaluated for the presence of a water lens on the upper surface of the PC steel stranded wire. As for the grout filling property, a case where the grout is sufficiently spread in a region formed by the core wire and the side line in the cross section is indicated by ◯, and a case where the region is not filled with the grout is indicated by ×.

表2に示すように0.13＜d1−d2≦1.8を満たす試料No.2-2〜2-5は、破断荷重183kN以上であると共に、芯線と側線とがつくる領域にグラウトが十分に充填されていることがわかる。また、これらの試料No.2-2〜2-5は、上記試料No.1-2〜1-6と同様に、芯線10と側線11とがつくる領域13にグラウト22が十分に充填されていた(図2参照)。更に、これらの試料は、グラウトの硬化前において材料の分離が生じておらず、撚り線長手方向においても十分にグラウトが充填されていた。従って、これら試料No.2-2〜2-5は、従来よりも防食性に優れると推測される。 As shown in Table 2, Sample Nos. 2-2 to 2-5 satisfying 0.13 <d 1 −d 2 ≦ 1.8 have a breaking load of 183 kN or more, and the region formed by the core wire and the side wire is sufficiently filled with grout You can see that Further, in these sample Nos. 2-2 to 2-5, similar to the sample Nos. 1-2 to 1-6, the grout 22 is sufficiently filled in the region 13 formed by the core wire 10 and the side wire 11. (See FIG. 2). Furthermore, these samples had no material separation prior to the hardening of the grout, and were sufficiently filled with the grout in the longitudinal direction of the stranded wire. Therefore, these sample Nos. 2-2 to 2-5 are presumed to have better anticorrosive properties than before.

本発明PC鋼撚り線は、プレストレストコンクリート構造物にプレストレスを付与する部材として好適に利用することができる。また、本発明コンクリート構造物は、プレストレスの付与が望まれる構造物に好適に利用することができる。   The PC steel stranded wire of the present invention can be suitably used as a member for applying prestress to a prestressed concrete structure. Moreover, this invention concrete structure can be utilized suitably for the structure where provision of prestress is desired.

本発明PC鋼撚り線の断面図である。It is sectional drawing of this invention PC steel strand. 本発明コンクリート構造物の断面図である。It is sectional drawing of this invention concrete structure. (A)は、従来のPC鋼撚り線の断面図、(B)は、従来のPC鋼撚り線を用いたコンクリート構造物の断面図である。(A) is a cross-sectional view of a conventional PC steel stranded wire, and (B) is a cross-sectional view of a concrete structure using a conventional PC steel stranded wire.

符号の説明Explanation of symbols

1,100 PC鋼撚り線 10,101 芯線 11,102 側線 12 隙間 13 領域
20,200 コンクリート 21,201 シース 22,202 グラウト 1,100 PC steel stranded wire 10,101 Core wire 11,102 Side wire 12 Clearance 13 Area
20,200 Concrete 21,201 Sheath 22,202 Grout

Claims (3)

1本の芯線と6本の側線とを撚り合わされた7本撚りのPC鋼撚り線であって、
芯線の径をd1、側線の径をd2とし、標準径(d1＋2d2)が12.0mm以上13.1mm以下のとき、0.13＜d1−d2≦1.8を満たすことを特徴とするPC鋼撚り線。 It is a 7-strand PC steel stranded wire in which one core wire and 6 side wires are twisted together,
When the core wire diameter is d 1 and the side wire diameter is d 2 and the standard diameter (d 1 + 2d 2 ) is 12.0 mm or more and 13.1 mm or less, the PC satisfies 0.13 <d 1 −d 2 ≦ 1.8 Steel stranded wire. 1本の芯線と6本の側線とを撚り合わされた7本撚りのPC鋼撚り線であって、
芯線の径をd1、側線の径をd2とし、標準径(d1＋2d2)が15.0mm以上16.0mm以下のとき、0.2＜d1−d2≦2.0を満たすことを特徴とするPC鋼撚り線。 It is a 7-strand PC steel stranded wire in which one core wire and 6 side wires are twisted together,
When the core wire diameter is d 1 and the side wire diameter is d 2 and the standard diameter (d 1 + 2d 2 ) is 15.0 mm or more and 16.0 mm or less, the PC satisfies 0.2 <d 1 −d 2 ≦ 2.0 Steel stranded wire. コンクリート構造物内に配置されたシースに請求項1又は2に記載のPC鋼撚り線が挿入され、
前記シース内は、グラウトが充填されると共に、PC鋼撚り線の側線間にグラウトが充填されていることを特徴とするコンクリート構造物。 The PC steel stranded wire according to claim 1 or 2 is inserted into a sheath disposed in a concrete structure,
A concrete structure characterized in that the inside of the sheath is filled with grout and between the side lines of the PC steel strands.
JP2004278383A 2004-09-24 2004-09-24 Pc steel stranded wire Pending JP2006090049A (en)

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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008007898A (en) * 2006-06-30 2008-01-17 Sumitomo Denko Steel Wire Kk High-strength pc steel stranded wire and concrete structure using the same
JP2008007896A (en) * 2006-06-30 2008-01-17 Sumitomo Denko Steel Wire Kk High-strength pc steel stranded wire and concrete structure using the same
CN103374844A (en) * 2012-04-12 2013-10-30 黑泽建设株式会社 Double rustproof pc strand
JP2016125330A (en) * 2015-01-08 2016-07-11 住友電工スチールワイヤー株式会社 Coated prestressing steel strand

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008007898A (en) * 2006-06-30 2008-01-17 Sumitomo Denko Steel Wire Kk High-strength pc steel stranded wire and concrete structure using the same
JP2008007896A (en) * 2006-06-30 2008-01-17 Sumitomo Denko Steel Wire Kk High-strength pc steel stranded wire and concrete structure using the same
CN103374844A (en) * 2012-04-12 2013-10-30 黑泽建设株式会社 Double rustproof pc strand
JP2016125330A (en) * 2015-01-08 2016-07-11 住友電工スチールワイヤー株式会社 Coated prestressing steel strand

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