JPS6247094B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method of connecting a steel wire and a steel cable, and particularly to a method of connecting a steel wire and a steel cable, and in particular, a method of connecting a steel wire and a steel cable to form a flexible connection portion without having a large outer diameter.

(Prior art) Conventionally, as a method of connecting a small diameter steel wire (single wire) and a large diameter strand, generally speaking, in order to make the connection between the solid wire and the steel cable equal to the strength of the solid wire (connection strength 100%), connecting parts were used. Special jigs such as were used. Although the use of such a connecting part improves workability and provides sufficient strength, it lacks flexibility and increases the outer diameter of the connecting part.

(Problems to be solved by this invention) This invention provides sufficient flexibility in the method of connecting a small diameter steel wire (single wire) and a thick diameter steel cable (the breaking strength is lower for a solid wire). , and to obtain a method for connecting a solid wire and a steel cable in which the outside diameter of the connected part is less than 2.5 times the diameter of the steel cable used for connection, and the strength of the connected part is equal to or greater than that of a single wire. The steel cable is connected to the tip of the single wire without any strands of the steel cable being damaged, and it maintains sufficient durability against repeated loads such as repeated bending fatigue tests. This invention relates to a method of connecting a single wire and a steel cable that increases the frictional resistance on the surface of the single wire or on the inner surface of the steel cable.

Structure of the Invention (Means for Solving Problems) In order to solve these problems, the present invention unravels the upper twisted portion of the steel cable by the length to be connected to the single wire, and then untwists the upper twisted portion as a lower twisted strand. After inserting the solid wire by the untwisted length of the twisted strand, the untwisted strand of this untwisted length is wound again into the solid wire, but before this, the diameter of the connection part is gradually changed. Prior to the above operation, the tip of the single wire is tapered, and the number of strands at the tip of each untwisted strand of steel wire is appropriately reduced to reduce the strand diameter.

Next, the single wire section is provided with unevenness to increase the frictional resistance, or the inner surface of the steel cable (the part that contacts the single wire) is provided with unevenness, and then wrapped around the single wire.

After that, in order to withstand repeated use over a long period of time, or to prevent the wound strands from coming apart in case they are used repeatedly through a roller, etc., both ends of the wound strands are After winding a flat spiral hoop to an appropriate length and wrapping it almost perpendicular to the pitch of the strand, compression processing is applied to the entire outer periphery as appropriate to increase the tightening force of the flat spiral hoop. This increases the strength of the joint, improves bending durability under load, and maintains the strength of the joint over a long period of time. In this case, the outer diameter of the connecting portion increases by the diameter of the inserted single wire (more precisely, it becomes slightly smaller than the diameter), and a gap is created. In addition to winding an appropriate number of reinforcing strands corresponding to this gap (this is the untwisted strand of the untwisted steel cable, with the same twist configuration and almost the same twist pitch) around the single wire section, the tip of the single wire is It is desirable to wrap the steel cable in the same twisting direction by an appropriate length that extends over the steel cable section.

At this time, in order to gradually change the diameter of the connecting portion as described above, it is preferable to perform this operation by suitably reducing the number of reinforcing strands at both ends.

(Example) Next, an example of the present invention will be described based on the drawings.

Figures 1 to 9 show the order of the connection method of the present invention, and in each figure, A is a side external view, and B is A.
-A, BB, CC, DD... are cross-sectional views at locations. Fig. 1 shows a 1.50 mm solid wire 1, and B shows its A-A cross section, while A in I shows the end of which has been filed into a conical shape.

Figure 2 shows approximately 3.0mm steel cable 2 consisting of 3 x 7.
And BB is the cross section. The diameter of the strands constituting the steel cable as 1.50mm pre-twisted strands is 0.50mm. That is, in order to connect this single wire 1 and steel cable (3x7) 2, first, as shown in Fig.
The strands are twisted and untwisted by the required winding length, and the number of strands b near the tip of each strand is reduced by three strands of appropriate length. C-C, C'-C', C''-C'' are the cross sections of strands 3, 4, and 5, D-D, and D'-D', D''-D'' are the cross sections of strands 3', 4 with three fewer strands. ', 5' is a sectional view. Figure 4 shows the state in which the strands 3, 4, and 5 are wound around the single wire 1 by the untwisted length shown in Figure 3. Naturally, the single wire 1 is wrapped around the center of the 3x7 steel cable 2. Since it is wound while being inserted, the pitch becomes longer and a gap c is created. In addition, since the strands are shaped differently during winding, the strands are wound while being expanded, so a tightening force is applied to the single wire 1. E-E shows the cross section of the reduced strands 3', 4', and 5' after winding, and F-F shows the normal strands 3, 4, and 5'.
5 is shown in each case. Figure 5 shows a reinforcing strand 1 in the gap c shown in Figure 4.
This is a state in which three ×7 wires are twisted, and the strands of the steel cables 2 to be connected can be used as they are as the reinforcing strands. First, attach the tip of the first reinforcing strand 6 to the third reinforcing strand.
After reducing the number of strands in the same way as in Figure b, the strands are wrapped between strands 3' and 4', and wound along the pitch that has already been wound. Reduce the tips of the reinforcing strands 7 and 8 and, like reinforcing strand 6, insert them between 4' and 5' and between 5' and 3', respectively, so that they stick to the three rolled strands. . This operation is carried out up to the tip a of the single wire 1, and then the reinforcing strand is wound in while gradually reducing the number of reinforcing strands in order to taper the end. To do this, first, attach one of the reinforcing strands (7' in the figure) to the tip a of the single wire 1.
Reduce the number of wires (from 7' to 4) near the center and insert it into the center. Therefore, there are a total of five outer strands.
Furthermore, in order to reduce the number of outer strands to four, the number of strands 7' in the center is further reduced (to two), and then one of the reinforcing strands (in the figure) of the external strands is removed. 6') gradually reduced (4
2 more strands from the book) and continue rolling them between strands 3 and 4. Furthermore, by removing all the strands wound in the center (reinforcement strand 7') and removing the outer reinforcing strands 6' slightly shifted from 7', we ended up with four outer strands without a center strand (initially Wrapped strands 3, 4, 5 and reinforcing strand 8, total 4
Then, the last reinforcing strand 8 is also reduced (from 4 to 2 strands), and finally only the first strands 3, 4, and 5 are left, and the twisting work is completed. Looking at each cross section, compared to the single wire cross section of A-A, G-G has six reduced strands (3', 4', 5' and reinforcing strands 6', 7', 8 '), H-H is in a normal strand winding state with no reduction in strands, and I-I is reduced by one reinforcing strand (strand 7) in the area immediately near where single wire 1 disappears. It becomes a cross section when inserted into the center of the book. In J-J, the center strand (strand 7') is further reduced to 7'', and the other reinforcing strand 6 is also reduced to 6', and K-
K is the cross section where the strands 7'' and 6' that have been reduced so far have completely disappeared and only the remaining outer strands are left, L-L is the cross section where the reinforcing strand 8 has been further reduced to 8', and B-B Original strand 2
FIG. In this way, it gradually tapers and reaches its maximum diameter at cross section H-H.
After that, the number of strands is gradually reduced, or the number of each strand is reduced and tapered to form the steel cable 2 before connection. During this time, the ends of any strand are separated. It is important to insert it into the outer strand so that it does not get damaged.

FIG. 6 shows a state in which an annealed flat steel wire g having a width of 0.40 mm x 2.00 mm is wound in contrast to FIG. 5, and is wound in the opposite direction to the twisting direction of the strand. Then, tightening or swaging is performed as necessary.

(Light processing such as swaging is particularly good for maintaining strength.) FIG. 7 shows the MM cross section after this swaging.

Although the above embodiments have not explained the unevenness provided to increase the frictional resistance inside the single wire or steel cable as a feature of the present invention, this will become clear from the following explanation. It is possible to make unevenness on only the single wire, only on the steel cable, or on both at the same time, but for the single wire, it is possible to make the unevenness by pressing at the same angle as the wrapped strand or at right angles to the single wire, or, Various known methods may be used, such as mild rolling with convex rolls or interposition of abrasive grains. Furthermore, the easiest way to create unevenness on the inner surface of a steel cable is to compress the steel cable only in the cable center direction and create impressions by the strands of the steel cable. When adding irregularities to a single wire, it is natural that it is disadvantageous to process the entire length of the connection in a way that affects the strength of the single wire, as this will lead to a decrease in the strength of the single wire. In addition, the embodiment is a simple one, with a single wire 1, a wound strand 3,
Since the reinforcing wires 4 and 5 and the reinforcing strands 6, 7, and 8 all have the same diameter, it is easy to select the reinforcing wire, but in reality, the single wire and the strand diameter often do not always match. In this case, the gap when wound into a single wire varies, and examples of such cases are shown below. Figures 8 and 9 are examples of the same 3x7 steel cables with different single wire diameters, and the single wire 10 in Figure 8 is 1/2 the diameter of the single wire 18 in Figure 9. . Figure 8 Row-1a 11, 12, 1
3 is a pre-twisted strand (1×
7), only the reinforcing strand 14 has the same diameter as the pre-twisted strands 11, 12, 13, and the strand 15 with a smaller diameter is wound into the gap remaining after the reinforcing strand 14 is wound. It is. On the other hand, in Figure 8, the row
1b is a single wire 10, and the strands 11, 12, and 13 are exactly the same as those in FIG. Regarding winding of a flat wire, the method shown in FIG. 8, Ro-1b, has better workability, the cross section becomes closer to a circle, and the tightening force is greater. In addition, in Fig. 9 Row-1a, the single wire 18 is thicker than in Fig. 8, and there is a remaining gap between the reinforcing strands 22, 23, 24 having the same diameter as the first twisted strands 19, 20, 21. On the other hand, the reinforcing strands 22, 23, 24 are two reinforcing strands 25, 26 with the same diameter and different diameters.
This is an example of folding. In the row 2b of FIG. 9, the single wire 18, the pre-twisted strands 19, 20, 21 and the reinforcing strands 22, 23, 24 are
This is an example in which a single reinforcing strand 27 having a different diameter is wound. Figure 9 Row 2a
It can be assumed that the difference in diameter is large, the workability is extremely poor, and the tightening force is small.

In the examples shown in Figures 8 and 9 above, we have explained that the first strand, reinforcing strand, etc. are wound in succession for ease of explanation, but in reality, it is better to wind both strands alternately. This was made clear in the previous example, and the reinforcing strands are twisted to match the pitch of the steel cables to be connected so that they can be easily wound and have sufficient strength after being wound. Use what you have.

As mentioned above, the embodiment has been described in detail based on the three-wire base, 3x7, but even if there is only one wire, the core strand is smaller in diameter than the single wire to be connected, or if the diameter of the core wire is smaller, the core strand or , if one improvement of the method shown in the example is carried out by cutting the core wire by the length of the connection and butting the tips of the single wires, that is, without inserting the reinforcing wire into the center of the steel cable. It becomes possible. Although I did not mention the connection length, the purpose,
It goes without saying that a sufficient length is required depending on the intended use. In addition, although the explanation has been given on the assumption that the first-twist strand has seven twists (1×7), the basic concept is exactly the same whether the first-twist strand is a multi-twist strand or a single wire.

[Brief explanation of the drawing]

1 to 9 show the order of the connection method according to the present invention, and in each figure, A is a side external view;
Figure 1 is a single steel wire, Figure 2 is a configuration of 3x
Fig. 3 shows the steel cable shown in Fig. 2 after being reduced to the length necessary to connect the ends of the steel cable and twisted back.
Figure 4 shows a state in which the untwisted portion of Figure 3 is wound around a single steel wire to be connected, Figure 5 shows a state in which reinforcing strands are twisted into the gap shown in Figure 4, Figure 6 is a diagram of the flat steel wire spirally wound in the opposite direction to the twisting direction of the strands compared to the one in Figure 5, Figure 7 is a cross-sectional view of the one in Figure 6 after swaging, 8 and 9 are explanatory diagrams showing other embodiments of the present invention. 1, 10, 18: Single steel wire, 2: Steel cable, 6, 7,
8, 14, 15, 16, 17, 22, 23, 2
4, 25, 26, 27: Reinforcement strand, a: conical shaped part, b: reduced part, c: gap part, g: flat steel wire.

Claims (1)

[Claims] 1. A method for connecting a small diameter steel wire and a large diameter steel cable, the first method involves untwisting the steel cable by the length of the connection and reducing the number of strands at the tip of the untwisted strand.
The second step is to process the untwisted strands to increase the frictional resistance between the connecting steel wire and the untwisted strands. A method for connecting a steel wire and a steel cable, comprising a third step of winding the wire around the winding portion, and a fourth step of winding a flat wire spiral hoop around the winding portion.