JP2568694Y2 - PC steel - Google Patents
PC steelInfo
- Publication number
- JP2568694Y2 JP2568694Y2 JP9804091U JP9804091U JP2568694Y2 JP 2568694 Y2 JP2568694 Y2 JP 2568694Y2 JP 9804091 U JP9804091 U JP 9804091U JP 9804091 U JP9804091 U JP 9804091U JP 2568694 Y2 JP2568694 Y2 JP 2568694Y2
- Authority
- JP
- Japan
- Prior art keywords
- steel
- wire
- wires
- steel material
- duct
- 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
Landscapes
- Reinforcement Elements For Buildings (AREA)
Description
【0001】[0001]
【産業上の利用分野】本考案は、コンクリート構造物に
用いられるPC鋼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 PC steel used for a concrete structure.
【0002】[0002]
【従来の技術及び解決しようとする課題】従来のPC鋼
材は、大別してPC鋼棒、PC鋼線、PC鋼撚り
線の3種類がある。このうち、PC鋼線又はPC鋼撚り
線を数本まとめてテンドンとして用いた場合、線もぐり
と呼ばれる現象が発生することがある。これは、従来よ
り用いられているPC鋼線又はPC鋼撚り線が、全て円
形の断面形状であったため、複数のこれらPC鋼材をダ
クト内に順次挿入した場合、後から挿入されたPC鋼材
が、既に配設されているPC鋼材の間にもぐりこむ現象
である。図3はダクト22内でのPC鋼材の配設状態を
示すもので、各数字はその挿入順序を示すものである。
同図(A)に示すように、ダクトの挿入口付近では、挿
入された順番に下から積層されているが、挿入口から離
れた箇所では、同図(B)に示すように、挿入順が後で
あるの線材が既設の線材の間にもぐりこみ、挿入順が
先であるの線材が最上段に位置しているような場合が
ある。このような線もぐりが発生した場合、線材に所定
以上の荷重が加わることがあるという問題があった。2. Description of the Related Art Conventional PC steel materials are roughly classified into three types: PC steel rods, PC steel wires, and PC steel stranded wires. Of these, when several PC steel wires or PC steel stranded wires are used collectively as tendons, a phenomenon called wire boring may occur. This is because the conventionally used PC steel wires or twisted PC steel wires all had a circular cross-sectional shape, and when a plurality of these PC steel materials were sequentially inserted into the duct, the PC steel material inserted later was not used. This is a phenomenon in which PC steel materials already provided are entrapped. FIG. 3 shows an arrangement state of the PC steel material in the duct 22, and each numeral indicates an insertion order.
As shown in FIG. 5A, the layers are stacked from the bottom in the order of insertion near the insertion port of the duct, but at locations away from the insertion port, as shown in FIG. However, there is a case where the later wire is entrapped between the existing wires, and the earlier wire is positioned at the top. When such wire boring occurs, there is a problem that a load of a predetermined value or more may be applied to the wire.
【0003】又、部材断面の薄い構造物にPC鋼撚り線
を適用した場合、かぶりコンクリートとの厚さの関係
で、いわゆるライズや偏心量が大きくとれず、PC鋼撚
り線の厚みそのものが適用対象を制約する要因となる。
さらに、PC鋼撚り線は、線材を撚り加工するために、
PC鋼線に比べて弾性係数が低下するという問題もあっ
た。Further, when a PC steel stranded wire is applied to a structure having a thin section of a member, so-called rise and eccentricity cannot be sufficiently increased due to the thickness of the cover concrete, and the thickness of the PC steel stranded wire itself is applied. It is a factor that restricts the target.
Furthermore, in order to twist the wire rod, the twisted PC steel wire
There is also a problem that the elastic modulus is lower than that of PC steel wire.
【0004】本考案は、上記の問題を解決するためにな
されたものであって、施工に際して線もぐりが発生せ
ず、適用構造物に制約の少ないPC鋼材を提供すること
を目的とするものである。The present invention has been made to solve the above-mentioned problem, and an object of the present invention is to provide a PC steel material which does not cause wire boring during construction and has few restrictions on applicable structures. is there.
【0005】[0005]
【課題を解決するための手段】前記の課題を解決するた
め、本考案PC鋼材は、外寸が1.0mmから10.0
mmで、引張強度が160Kg/mm2 以上である複数
の鋼線を、並列配置し、一体化したことを特徴とするも
のである。In order to solve the above-mentioned problems, the PC steel of the present invention has an outer dimension of 1.0 mm to 10.0 mm.
A plurality of steel wires having a tensile strength of 160 kg / mm 2 or more in mm are arranged in parallel and integrated.
【0006】ここで用いられる鋼線は、その断面形状が
円形のものでも、非円形のものでもかまわない。断面形
状が円形の場合、その外寸は直径をあらわし、非円形の
場合、その外寸は線材断面の最大寸法をいう。鋼線の外
寸を上記のように限定したのは、1.0mm未満では強
度の点で十分ではなく、10.0mmより大きいもの
は、断面の薄い構造物に用いる場合不適切だからであ
る。引張強度を160Kg/mm2 以上としたのは、そ
れ未満ではやはり強度の点で十分なPC鋼材が得られな
いからである。The steel wire used here may have a circular cross section or a non-circular cross section. When the cross-sectional shape is circular, the outer dimension indicates the diameter, and when the cross-sectional shape is non-circular, the outer dimension refers to the maximum dimension of the wire rod cross section. The reason why the outer dimensions of the steel wire are limited as described above is that if the diameter is less than 1.0 mm, the strength is not sufficient, and if the diameter is more than 10.0 mm, it is inappropriate for use in a structure having a thin cross section. The reason why the tensile strength is set to 160 kg / mm 2 or more is that if it is less than that, a sufficient PC steel material cannot be obtained in terms of strength.
【0007】又、鋼線を並列状態に一体化する手段は、
例えば隣接する線材同志の間を接着剤で固定したり、鋼
線の端部あるいは全長にわたって金属製スリーブを用
い、圧着すること等で行う。ここで、並列する本数は一
般的に3本から19本である。Means for integrating steel wires in a parallel state is as follows:
For example, it is performed by fixing an adjacent wire rod with an adhesive or by crimping using a metal sleeve over the end or the entire length of the steel wire. Here, the number of parallel lines is generally 3 to 19 lines.
【0008】[0008]
【作用】このように、複数の鋼線を並列に一体化したこ
とで、PC鋼材として幅の広い扁平なケーブルとなり、
ダクト内にこれを配設する場合、後から挿入されたPC
鋼材は既設のPC鋼材の上に順序よく載置されていくた
め、いわゆる線もぐりが発生することはない。又、線材
が扁平な形状であるため、薄い構造物にも適用でき、従
来のPC鋼撚り線のように線材の厚み自体が適用対象を
制約するということがない。特に、ダクトも扁平なもの
を用いれば、線もぐり防止及び薄い構造物への適用が一
層効果的に行える。As described above, by integrating a plurality of steel wires in parallel, a wide flat cable as a PC steel material is obtained.
When installing this in a duct, the PC inserted afterwards
Since the steel material is placed in order on the existing PC steel material, so-called wire boring does not occur. Further, since the wire has a flat shape, the wire can be applied to a thin structure, and the thickness itself of the wire does not limit the application target as in the case of a conventional stranded PC steel wire. In particular, if the duct is a flat one, it is possible to more effectively prevent the wire from being dug and apply it to a thin structure.
【0009】[0009]
【実施例】以下、図1及び図2を用いて本考案実施例を
説明する。図1(A)は、本考案実施例の斜視図であ
り、図示のように、直径4mmの鋼線1を7本並列に配
置し、各鋼線1の間を同図(B)に示すように、接着剤
2で固着して一体化した。このような、PC鋼材をスラ
ブ内に配設する場合について説明する。図2(A)に示
すように、スラブ内にはダクト12が埋設されており、
この一端からPC鋼材10を挿入する。このダクト12
は同図(B)に示すように断面が扁平形状のもので、複
数の前記PC鋼材10を順次挿入していく際、後から挿
入されるPC鋼材10は、既に配設されているPC鋼材
の上を滑りながら順次積層して配設される。このため、
いわゆる線もぐりは発生せず、また従来のPC鋼撚り線
などに比べて厚みが小さいため、薄い構造物にも適用し
易い。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. FIG. 1A is a perspective view of an embodiment of the present invention. As shown, seven steel wires 1 each having a diameter of 4 mm are arranged in parallel, and the space between the steel wires 1 is shown in FIG. As described above, they were fixed by the adhesive 2 and integrated. A case where such a PC steel material is disposed in a slab will be described. As shown in FIG. 2A, a duct 12 is embedded in the slab.
The PC steel material 10 is inserted from one end. This duct 12
As shown in FIG. 2B, the cross section is flat, and when a plurality of PC steel materials 10 are sequentially inserted, the PC steel material 10 inserted later is the PC steel material already provided. Are arranged one after the other while sliding on the top. For this reason,
Since so-called wire boring does not occur and the thickness is smaller than that of a conventional twisted PC steel wire or the like, it can be easily applied to thin structures.
【0010】[0010]
【考案の効果】以上説明したように、本考案PC鋼材
は、次のような効果を有する。複数の線材を並列に一
体化したものであるため幅が広くダクト内への配設に際
していわゆる線もぐりが発生することがない。これによ
り、PC鋼材に所定以上の荷重が加わることを防止でき
る。扁平な断面形状であるため、幅広い構造物に適用
できる。特に、薄い構造物などにも用意に適用すること
ができる。生産設備に特に大きな変更を加えることな
く、PC鋼材の構成(鋼線外寸や並列数)を比較的自由
に選択できるため、構造物に応じた鋼材が得られ、プレ
ストレス力をコントロールし易い。複数の鋼線を並列
配置したことで、例えば7本、19本の線材を用いたP
C鋼撚り線に比べて、外部のコンクリートとの付着面積
が大きく、構造物にかかる負荷に対して有効に作用す
る。断面が扁平形状であるため、弾性範囲内で巻取り
を行って保管、運搬する際、小さい曲げ半径で巻くこと
ができ、全体形状を小さくすることができる。As described above, the PC steel of the present invention has the following effects. Since a plurality of wires are integrated in parallel, the wires are so wide that so-called wire boring does not occur when the wires are arranged in a duct. Thus, it is possible to prevent a load equal to or more than a predetermined value from being applied to the PC steel material. Since it has a flat cross section, it can be applied to a wide range of structures. In particular, it can be easily applied to thin structures and the like. The configuration of the PC steel material (external dimensions of the steel wire and the number of parallel wires) can be selected relatively freely without particularly large changes to the production equipment, so that the steel material suitable for the structure can be obtained and the prestressing force can be easily controlled. . By arranging a plurality of steel wires in parallel, for example, P using seven or nineteen wire rods
Compared with the stranded C steel wire, the area of attachment to the external concrete is large, and it effectively acts on the load applied to the structure. Since the cross section is flat, it can be wound with a small bending radius when stored and transported after being wound within the elastic range, and the overall shape can be reduced.
【図1】(A)は本考案PC鋼材の断面図、(B)は前
記鋼材の各線剤接着部分を示す断面図。1A is a cross-sectional view of a PC steel material of the present invention, and FIG. 1B is a cross-sectional view showing each wire bonding portion of the steel material.
【図2】(A)は本考案PC鋼材のダクトへの配設を示
す説明図、(B)はダクト内でのPC鋼材の配設状態を
示す断面図。FIG. 2 (A) is an explanatory view showing the arrangement of the PC steel material of the present invention in the duct, and FIG. 2 (B) is a cross-sectional view showing the arrangement state of the PC steel material in the duct.
【図3】従来のPC鋼撚り線を、ダクト内に配設した場
合における、線もぐりの説明図で、(A)は順序良く配
設されている場合、(B)は線もぐりが発生した場合を
示す。3A and 3B are explanatory diagrams of wire boring when a conventional twisted PC steel wire is provided in a duct. FIG. 3A shows a case where wires are provided in order, and FIG. 3B shows a wire boring. Show the case.
1、11 鋼線 2 接着剤 10 PC鋼材 12、22 ダクト 20 PC鋼線又はPC鋼撚り線 1, 11 steel wire 2 adhesive 10 PC steel 12, 22 duct 20 PC steel wire or PC steel stranded wire
Claims (1)
引張強度が160Kg/mm2 以上である複数の鋼線
を、並列配置し、一体化したことを特徴とするPC鋼
材。1. The outer dimensions are from 1.0 mm to 10.0 mm,
A PC steel material comprising a plurality of steel wires having a tensile strength of 160 kg / mm 2 or more arranged in parallel and integrated.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9804091U JP2568694Y2 (en) | 1991-10-30 | 1991-10-30 | PC steel |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9804091U JP2568694Y2 (en) | 1991-10-30 | 1991-10-30 | PC steel |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0540432U JPH0540432U (en) | 1993-06-01 |
JP2568694Y2 true JP2568694Y2 (en) | 1998-04-15 |
Family
ID=14208977
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9804091U Expired - Lifetime JP2568694Y2 (en) | 1991-10-30 | 1991-10-30 | PC steel |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2568694Y2 (en) |
-
1991
- 1991-10-30 JP JP9804091U patent/JP2568694Y2/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
JPH0540432U (en) | 1993-06-01 |
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