JPS62215085A - Structure of cable terminal jig - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to the structure of a cable terminal with excellent static and dynamic strength characteristics.

(Prior art) A cable-stayed cable used as a main structural member of a suspended structure is stretched diagonally between a tower 1o and a girder 11, and is provided at both ends of the cable 12, as shown in FIG. Anchor head 13 connects tower 10 and girder 11 via shim 14
The cable 12 is mounted in such a way that it can be tensioned by being locked to the cable 12, so that static and dynamic loads can be carried by the cable 12. In this structure, the cable end is in the most severe condition in terms of strength, so there is a risk of breakage at this part, so the cable end must have high static and dynamic strength characteristics.

That is, the strength characteristics of the cable-stayed cable are determined by the cable main body 100 shown in FIG. 7 and the anchor head parts 200 at both ends of the cable.
consists of a collection of individual strands 15, and each strand 15 is inserted into the anchor head 13 at both ends and heading processing is performed at the tip (head 17), whereby each cable 15 connects to the anchor 13 It is locked to. During use of the cable, tension is applied to each strand 15, and therefore, at the entrance end 16 where each strand 15 is inserted into the anchor head 13, the strand 15 is bent and bending stress is applied.
In particular, under conditions where dynamic loads are applied repeatedly and extremely large stresses are applied locally, there is a problem in that the static and dynamic strength decreases due to fretting. .

Further, an outer skin is attached to the outer periphery of the main body part 100, and 4.1 strands 1
A ring is attached to prevent the wire 5 from spreading, and this attachment has the problem that the strands 15 are also bent at the section, which reduces the strength of that section as described above.

(Objective of the Invention) This invention was made to eliminate such conventional drawbacks, and the anchor head attachment at both ends of the cable and the ring attachment at the anchor head section and the ring attachment section were made to improve the static and dynamic strength characteristics. This provides an excellent cable terminal structure.

(Structure of the Invention) The first gist of the present invention is that in a cable terminal device in which an anchor is attached to the end of the cable, a cap that covers the outer circumference of the cable is attached to the base side of the anchor head, and a The inside of the cap containing the cap is filled with a soft material.

A second aspect of the invention is that in the first invention, a ring for preventing the strands from spreading is fitted onto the end of the portion of the cable main body where the strands are spread, and the inner surface of this ring is It is formed on a gentle surface that corresponds to the spread of the cable concentration.

A third aspect of the invention is that, in the second invention, a cushioning material is interposed between the inner circumferential surface of the ring and the outer circumferential surface of the cable.

In the above configuration, the filler made of a soft material prevents the wire from bending at the entrance of the anchor head when a tensile force is applied to the cable wire, thereby preventing the generation of locally concentrated stress. This improves static and dynamic strength properties. Further, in the second aspect of the invention, the occurrence of local concentrated stress in the ring portion of the cable main body is prevented. Furthermore, in the third invention, the effects of the second invention are better achieved.

(Example) In FIGS. 1 and 2, elements 115 constituting the cable are spread out at the ends of the cable 12, and those ends are inserted into the holes 18 of the anchor head 13 so that each tip end is attached to the head. It is locked by processing. On the base side of the anchor head 13, there is a base 2 that covers the outer circumference of the cable.
is attached, and the inside of this base 2 is filled with a filler 3 made of a soft material including between the respective strands 15. That is, each strand 15 passes through the filler 3 and the anchor head 13. As the soft material, rubber, synthetic resin, or soft metal such as zinc or lead can be used.

A sheath 12a is attached to the outer periphery of the cable 12, and a ring 4 for preventing the strands 15 from spreading is disposed at the end of the sheath 12a. The inner peripheral surface of this ring 4 is
-15 is formed into a gentle surface 40 corresponding to the spread of the cable 12, and this inner circumferential surface presses the spread part of the cable 12,
The spread of the strands 15 is restricted.

FIG. 3 shows another embodiment of the present invention, which is similar to the above in that the cap 2 is attached to the base side of the anchor head 13 so as to cover the cable, but the hole in the anchor head 13 is
A widening part 30 is formed at the base side end of 8, and the filler 3 is also filled therein. Further, a cushioning material 41 is attached to the inner peripheral surface of the ring 4, and this cushioning material 4
1 to press down the outer circumferential surface of the expanding portion of the cable 12, thereby restraining the element 115 from expanding. The cushioning material 41 is filled not only on the inner peripheral surface of the ring 4 but also between the wires 15,
Inside the ring 4, the eight elements 115 may pass through the cushion material 41 without contacting each other.

In the above configuration, when the cable is used, static and dynamic tension is applied to the cable, and the tension is 8 elements 1 it.
15 and supported by the anchor head 13. In addition, each cable line 15 is a virtual 1a15a in FIG.
is displaced from the position indicated by the solid line to the position indicated by the solid line, and therefore bending stress is applied to the entrance side end 16 of the hole 18, but the elastic deformation of the filler 3 made of a soft material occurs in response to the displacement of the strand 15. The part of the wire 15 that penetrates through the filling material 3 due to the reaction force caused by
is gently curved to prevent local bending stress from acting on the end portion 16, thereby preventing fretting.

In the example shown in FIG. 3, a widened portion 30 is formed at the entrance side end of the hole 18 and is filled with the filler 3, so that the bending stress and fretting effects can be reliably prevented. .

In addition, the local bending stress action and fretting action may also occur in the ring 40 portion, but in the above structure, since the inner circumferential surface of the ring 4 is curved in accordance with the spread of the strands 15, the ring Element P throughout the entire inner circumferential surface
115, thereby preventing local stress from acting and preventing fretting.

In particular, in the configuration shown in FIG. 3, since the ring 4 is in contact with the cable 1j115 via the cushion material 41, the above effects can be better achieved.

FIG. 5 shows the structure shown in FIGS. 1 and 2 and the filling material 3.
This figure shows a state in which a dynamic load is applied in order to compare the strength with a conventional structure that does not have a The anchor head 13 at the other end is supported by a movable support 90. The anchor head on the fixed support side is tilted at an angle θ with respect to the cable 12, and the movable support body 90 applies repeated tensile stress to the cable 12. The maximum additional load was set to 0.45 times the tensile strength of the cable, and the load was changed to a smaller value and the load was repeated 2 million times to measure the occurrence of breakage of the strands and the varying stress width.

The results are shown in Figure 6. In the same figure, the curve 1i183 shows the structure according to the conventional structure, and the curve 93 shows the structure according to the present invention.From this, it can be seen that the structure according to the present invention has a higher fluctuating stress in both cases where the inclination angle of the anchor head 13 is 5° and 10''. It can be seen that the width is large and therefore it can withstand large fluctuating stress.

Note that even in the case of the present invention, if the inclination angle θ of the anchor head 13 exceeds 10°, the rate of decrease in the fluctuating stress width increases, so the anchor head 13 is adjusted so that the inclination of the element 1115 with respect to the anchor head is 10″ or less. ring 4
It is preferable to set an interval between

(Effects of the Invention) As explained above, the present invention uses a filler made of a soft material to prevent the cable wire from bending at the anchor head entrance when a tensile force is applied to the cable wire. Static and dynamic strength properties are improved by preventing the generation of locally concentrated stress. Further, in the second aspect of the invention, the occurrence of local concentrated stress in the ring portion of the cable main body is prevented.

Furthermore, in the third invention, the effects of the second invention are better achieved.

[Brief explanation of drawings]

FIG. 1 shows an i7 cable end portion showing an embodiment of the present invention.
! Fig. 4 and Fig. 2 are longitudinal sectional views thereof, Fig. 3 is a view equivalent to Fig. 2 showing another embodiment, and Fig. 4 is a cross-sectional explanation showing the relationship between the strand and the anchor head when tensile stress is applied. Figure 5 shows an example of applying variable stress to the cable! @Explanatory diagram of the device,
FIG. 6 is a diagram showing the relationship between the width of the added fluctuating stress and the angle of inclination of the anchor head, FIG. 7 is a longitudinal sectional view of the conventional cable f& section, and FIG. 8 is an explanatory diagram of the cable in use. 2... Cap, 3... Filler, 4... Ring, 12
...Cape J, 13...Anchorhead, 15.
...Element wire, 16...Anchor head hole entrance m end, 19...Outer vessel. Patent applicant Shinko Wire Industries Co., Ltd. Representative Patent attorney Etsushi Kotani Patent attorney Chief 1) Masayuki Patent attorney Hatao Itaya No. 1 Fig. 2 z Fig. 3/II jρ No. 4 Z No. ze

Claims (1)

[Claims] 1. In a cable terminal device in which an anchor head is attached to the end of the cable, a cap that covers the outer circumference of the cable is attached to the base side of the anchor head, and the inside of the cap including between each strand of the cable is attached to the base side of the anchor head. A structure of a cable terminal device characterized by being filled with a soft material. 2. In a cable terminal device in which an anchor head is attached to the end of the cable, a cap that covers the outer circumference of the cable is attached to the base side of the anchor head, and a soft material is filled inside the cap, including between each strand of the cable. At the end of the part of the cable main body where the wires are spread out, a ring is fitted on the outside to prevent the wires from spreading, and the inner surface of this ring is formed into a gentle surface corresponding to the spread of the cable wires. A structure of a cable terminal device characterized by: 3. In a cable terminal device in which an anchor head is attached to the end of the cable, a cap that covers the outer circumference of the cable is attached to the base side of the anchor head, and a soft material is filled inside the cap, including between each strand of the cable. A ring that prevents the strands from spreading is fitted onto the end of the portion of the cable main body where the strands are spread, and the inner surface of this ring is formed into a gentle surface corresponding to the spread of the cable strands, A structure of a cable terminal device characterized in that a cushioning material is interposed between the inner circumferential surface of the ring and the outer circumferential surface of the cable.