JPS5922824Y2 - Fixing tool for PC steel materials - Google Patents

Description

【考案の詳細な説明】 この考案はＰＣ鋼材の定着具の構造に関するものである
。[Detailed description of the invention] This invention relates to the structure of a fixing device for PC steel.

一般に強い引張り荷重を負荷して使用するＰＣ鋼材の定
着は、第１図に示すようにＰＣ鋼材１を把持する模型の
定着具２をコンクリート４に埋め込まれあるいは当てら
れたブレート５に当てた定着部材３のテーパ一孔に嵌め
込んで行うのが普通である。Generally, the fixing of PC steel materials that are used under a strong tensile load is carried out by applying a model fixing device 2 that grips the PC steel material 1 to a plate 5 that is embedded or applied to concrete 4, as shown in Fig. 1. This is usually done by fitting it into a tapered hole in the member 3.

定着具２の外側は定着部材３のテーパ一孔とはパ同しテ
ーパーとして定着具２の中心部のネジ状の爪を有する孔
を内側に締めつけてＰＣ鋼材の把持を確実にする。The outer side of the fixing tool 2 is tapered in the same way as the tapered hole of the fixing member 3, and the hole having a threaded claw at the center of the fixing tool 2 is tightened inward to securely grip the PC steel material.

また第２図に示すように２つの割型の定着具を１対にし
て用いることが多い。Furthermore, as shown in FIG. 2, two split-shaped fixing devices are often used as a pair.

この場合ネジ状の爪が全長に亘って切られていると定着
具の先端のところのＰＣ鋼材の断面の外周部に集中応力
が生じ、そこから破断が開始するので該ＰＣ鋼材の全抗
張力を充分利用することができない。In this case, if the screw-shaped nail is cut over the entire length, concentrated stress will occur at the outer periphery of the cross section of the PC steel material at the tip of the fixing tool, and fracture will start from there, so the total tensile strength of the PC steel material will be reduced. cannot be used fully.

そのため第２図に示すように定着具２の先端部のネジ山
を２〜３山先端になるほど低くなるように削り取って爪
の噛み込みを弱くして応力集中を避けることが行われて
いる。Therefore, as shown in FIG. 2, the screw threads at the tip of the fixing tool 2 are shaved off so that the threads become lower as the tips reach two or three threads to weaken the biting of the nails and avoid stress concentration.

しかし、この方法では定着具２のネジの有効長さが短く
なる。However, with this method, the effective length of the screw of the fixing device 2 is shortened.

また孔の内側のネジ山をテーパーに一部削る加工は厄介
である。Also, it is difficult to process a part of the thread inside the hole to make it taper.

本考案の定着具は外側のテーパーを２段とすることによ
って上記欠点を除き、ネジ状の爪の保合を全長に亘って
完全にしながら応力集中を避けることができるようにし
たものである。The fixing tool of the present invention eliminates the above-mentioned drawbacks by having two steps of outer taper, and makes it possible to completely secure the threaded pawl over its entire length while avoiding stress concentration.

この考案を図面にもとづいて説明すると第３図に示すよ
うに定着具の内側は全長に亘って完全なネジ状の爪をも
うけ外周の本体部Ａは定着部材のテーパ一孔とはパ同じ
テーパーθ１の模型とし、先端部Ｂの先端より長さｌの
部分をθ１よ））大きな角度あのテーパーとしたもので
゛ある。To explain this idea based on the drawings, as shown in Fig. 3, the inside of the fixing tool has a complete screw-like claw over the entire length, and the main body part A on the outer periphery has the same taper as the tapered hole of the fixing member. A model of θ1 is used, and a portion of length l from the tip of tip portion B is tapered at a large angle as θ1).

この場合ＰＣ鋼材の材質、直径などによるが４と島の角
度差は少くとも１°以上好ましくは５°程度であり、■
が１ｍｍ以下では短か過ぎて先端部での応力集中か避け
られず、１は少なくとも１ｍｍ、好ましくは４ｍ／ｍ程
度とするのが製造上、使用上適当であり本考案の効果が
発揮できる。In this case, although it depends on the material and diameter of the PC steel material, the angle difference between 4 and the island is at least 1° or more, preferably about 5°,
If it is less than 1 mm, it is too short and stress concentration at the tip is unavoidable, so 1 is at least 1 mm, preferably about 4 m/m, which is suitable for manufacturing and use, and the effects of the present invention can be exhibited.

この定着具を用いてＰＣ鋼材を従来と同し方法で定着す
ると上部Ａには楔作用による締つけ力が働くが、先端部
Ｂのあの角度の部分は締つけ力は働かず定着部材のテー
パ一孔との間に隙間を生じている。When this fixing tool is used to fix a PC steel material in the same way as before, a tightening force is applied to the upper part A due to the wedge action, but no tightening force is applied to that angled portion of the tip B, and the tapered part of the fixing member There is a gap between the two holes.

そのため定着具の先端部ＢにおけるＰＣ鋼材の外側周辺
部の応力集中が避けられる。Therefore, stress concentration on the outer periphery of the PC steel material at the tip B of the fixing tool can be avoided.

またネジは、全長に亘って完全に噛み込んでいるのでネ
ジの有効長さ、すなわち把持力にロスが無くそのため定
着具の長さを短くすることが可能である。Further, since the screw is completely engaged over its entire length, there is no loss in the effective length of the screw, that is, in the gripping force, and therefore the length of the fixing tool can be shortened.

また定着具の製造に際しては外側のテーパー加工のみで
良〈従来の定着具より容易である。Furthermore, when manufacturing the fixing device, only the outside taper processing is required (it is easier than conventional fixing devices).

Ｌ記の説明より明らかなように本考案は、２つ割型の定
着具、成るいはＰＣ鋼材用の定着具に限定されるもので
はなく、その他の同種定着具にも利用で゛きるもので゛
ある。As is clear from the explanation in Section L, the present invention is not limited to a two-piece type fixing device or a fixing device for PC steel materials, but can also be used for other similar types of fixing devices. It is.

また、ＰＣ鋼材側の外周にネジを切り定着具の中心孔と
ネジ係合したときにも同様に有効である。It is also similarly effective when a thread is cut on the outer periphery of the PC steel material and engaged with the center hole of the fixing tool.

この考案によるとＰＣ鋼材中に応力集中が発生すること
なく、また係合部を有効に利用できるので従来の定着具
に比しより短く、且つ製造容易な定着具とすることがで
きる効果を有するもので゛ある。According to this invention, stress concentration does not occur in the PC steel material, and the engaging portion can be used effectively, so it has the effect of making the fixing device shorter and easier to manufacture than conventional fixing devices. It is something.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は、ＰＣ鋼材をコンクリ−１−に定着層の定着部
の断面図、第２図は従来の２つ割型定着具の斜視図、第
３図は、本考案の定着具の正面図である。 １：ＰＣ鋼材、２：定着具、３：定着部材、４：コンク
リート、５ニブレート。Fig. 1 is a sectional view of the fixing part of the fixing layer of PC steel material on concrete 1-, Fig. 2 is a perspective view of a conventional two-piece fixing device, and Fig. 3 is a front view of the fixing device of the present invention. It is a diagram. 1: PC steel material, 2: Fixing tool, 3: Fixing member, 4: Concrete, 5 Nibrate.

Claims (1)

【実用新案登録請求の範囲】 １ 中心部にＰＣ鋼材と係合し内側に全長にわたりネジ
状の爪をもうけ、且つ円錐型の外形を有するＰＣ鋼材用
定着具において、本体部Ａのテーパーθ１より大きなテ
ーパーへの円錐部を先端部Ｂにもうけたことを特徴とす
るＰＣ鋼材用定着具。 ２ テーパーへの部分の長さが少なくとも１ ｍｍ以上
であることを特徴とする実用新案登録請求の範囲第１項
記載のＰＣ鋼材用定着具。[Claims for Utility Model Registration] 1. In a fixing tool for PC steel that engages with the PC steel at the center and has a screw-like pawl extending over the entire length inside, and has a conical outer shape, A fixing tool for prestressing steel material characterized by having a large taper conical part at the tip B. 2. The fixing tool for prestressing steel material according to claim 1, wherein the length of the tapered portion is at least 1 mm.