CN203836077U - Tail end fastening structure of rope - Google Patents

Abstract

The utility model provides an end fastening structure of a rope. The end fastening structure of the rope has a proximal opening (15) formed at the proximal end (7) and a distal opening (15) formed at the distal end (9). 17), and a through hole (11) communicating with the proximal opening (15) and the distal opening (17). The through hole (11) is formed with a small diameter portion (25) and a large diameter portion (23) arranged on the distal end opening (17) side; the rope (1) inserted through the through hole (11); part (23) of the end portion of the rope (1) and the end of the rope (1) on the distal opening (17) side to expand the diameter of the member (31), the diameter of the rope (1) is enlarged The diameter of the tip is larger than that of the small diameter portion (25).

Description

Rope end fastening structure

technical field

The utility model relates to an end fastening structure of a rope using fastening accessories.

Background technique

Ropes are generally widely used for mooring ships, connecting vehicles, and the like. In addition, especially the stranded ropes of high-strength fiber composite cables such as carbon fiber composite cables have the characteristics of high strength, light weight, high corrosion resistance, and non-magnetic properties. Therefore, for example, as prestressed concrete bridges in corrosive environments, Reinforcing members of concrete structures such as trestles, tensile members of highly corrosion-resistant anchors, reinforcing core materials of overhead transmission lines with low deflection, reinforcing members of magnetic concrete structures (eg, guide rails of maglev trains), etc. are used.

In order to use these ropes for the above-mentioned uses, it is necessary to process them using an end fastening tool in a manner suitable for connecting the ends of the ropes.

However, depending on the rope, when a tensile load is applied to the rope, the diameter of the rope becomes small, and the fastening force with the terminal fastening tool becomes weak, and the cable may fall off from the terminal fastening tool. In addition, in the case of high-strength fiber composite cables, although they have high strength equivalent to PC steel strands in axial tension, they have local shear forces in the radial direction, surface damage, etc. This feature is weak. Therefore, when attaching the terminal fastening tool to the rope, the method of inserting the wedge directly into the fixing method, which can be used as the usual fastening method of the PC steel strand, tends to cause cutting due to shear failure, and thus cannot obtain a better result. High fastening efficiency.

As a countermeasure against these problems, for example, there is a method of fastening the end of a rope proposed in all patents (Patent Document 1) of the present applicant. These are fastening methods suitable for use on the construction site.

In the fastening method of Patent Document 1, when the end of the high-strength fiber composite cable is processed, an expansion material is used to fill the plug in order not to generate local stress concentration. Specifically, a cable insertion hole is provided and a filler material around the cable insertion hole is inserted into the end of the cable through a spacer for the hole, and then the cable is inserted into the sleeve so that the spacer is spaced apart. The material is located in the center of the longitudinal direction of the sleeve, and then waterproof members are installed at both ends of the sleeve. Next, an expansive filler such as cement is injected so that the filler passing through the spacer fills the entire inside of the sleeve, and thereafter, the expansive filler is cured and generated by the expansion pressure of the expansive filler. friction to secure the end of the cable.

prior art literature

patent documents

Patent Document 1: Japanese Patent No. 4288122

However, in the fastening method of Patent Document 1, since an expansive filler such as cement is used, it is necessary to judge whether or not the filler is reliably filled in the sleeve, and it takes time after filling until the filler solidifies and develops strength ( at least a few hours). In this way, from the filling of the expansive filler to the curing of the filler and the generation of strength, it is necessary to carefully manage the amount, temperature, and curing of the filler. Therefore, a high level of skill is required during construction, and there may be cases where the end of the rope cannot be said. The case of easy processing. Therefore, there is sufficient room for improvement.

Utility model content

This utility model was made in view of the above-mentioned problems, and its object is to provide a rope end fastening structure that can achieve high Excellent fastening efficiency and fastening effect, can produce fastening effect immediately, and it is difficult to produce cutting caused by shear failure.

In order to achieve the above object, the end fastening structure of the rope of the present utility model is characterized in that it includes: a cylindrical end fitting, the end fitting has a proximal opening formed at the proximal end, a distal opening formed at the distal end, And a through hole communicating with the above-mentioned proximal opening and the above-mentioned distal opening, in which a small-diameter portion and a large-diameter portion disposed on the opening side of the above-mentioned distal end are formed in the through-hole; a rope, the rope is inserted through the above-mentioned through-hole; The diameter-expanding member is inserted into the above-mentioned end portion of the rope located at the above-mentioned large-diameter portion and expands the end of the distal opening side of the rope, and the diameter of the enlarged end-end of the rope is larger than the diameter of the above-mentioned small-diameter portion. big.

After the rope is inserted through the through hole, the terminal fitting is pressed from the outside in the circumferential direction so that the diameter of the through hole is smaller than the diameter of the rope, and the inner peripheral surface of the through hole is brought into pressure contact with the outer surface of the rope. In this way, the cord can be restrained in the above-mentioned through hole. This pressing is usually performed by applying uniform pressure over the entire circumference of the fastening fitting to equalize the load on the rope, but it also includes the case of applying biased pressure and the case of applying pressure to only a part of the end fitting.

Since the cord is contained in the terminal fitting by contacting the inner peripheral surface of the through hole of the fastening fitting with the cord, local stress concentration on the cord can be prevented, and reliable detachment of the cord can be achieved more simply.

The diameter-expanding member is inserted into a void of a plurality of strands or threads constituting the rope. That is, the diameter expansion of the terminal end of the rope can be realized by installing a wedge-shaped diameter expansion member, which has, for example, a through hole for the wire on the outer circumference of a plurality of wires or strands constituting the rope. Has a tapered surface. In addition, as another method, a ring-shaped member may be attached to the outer circumference of the rope at the end of the rope. As mentioned above, the diameter-expanded structures of the ends of the cords are not limited to these structures.

In the fastening structure of the present invention, the above-mentioned rope can be a rope formed by twisting a plurality of side strands (peripheral strands) around a core strand (core strand).

The aforementioned rope can be, for example, a high-strength fiber composite cable including a carbon fiber composite cable formed by twisting a plurality of peripheral wires around a core wire.

Preferably, on the side of the distal opening of the above-mentioned through hole, the inner surface of the end portion on the distal opening side having a larger diameter without the protrusion is formed between the inner surface where the protrusion is formed and the diameter becomes smaller. Has a tapered surface. The tapered surface can be formed when the end fitting is produced, or can be formed when the end fitting is pressed from the circumferential outside.

In order to expand the diameter of the end of the rope, when installing a wedge-shaped diameter-expanding member with a tapered surface on the outer circumference, the diameter-expanding member preferably has a contact with the above-mentioned The conical surface corresponds to the complementary type of conical surface. In this way, a large contact area or frictional force can be ensured between the wires of the rope sandwiched between the two tapered surfaces.

As mentioned above, according to the terminal fastening structure of the present utility model, the diameter-expanding member combined with the strand or wire is enlarged so that the end of the rope is larger than the small-diameter portion of the through hole, and the inner surface of the through hole is in contact with the part that constitutes the rope. The strands or threads contact to constrain the rope, thus, an anchoring effect (Japanese: アンカ effect) can be produced on the rope. Therefore, it is possible to obtain a highly reliable rope detachment prevention effect.

In addition, according to the present invention, since no expansive filler such as cement is used, it is not necessary to perform precise management of the amount and temperature of the expansive filler at the work site. Therefore, regardless of the skill of the worker, and there is no need to wait for curing of the filler, etc., it is possible to improve work efficiency.

Other objects and advantages of the present invention will be apparent from the following description, drawings, and the description of the attached utility model registration claims.

Description of drawings

Fig. 1 shows the fastening structure of the present invention, which shows that the inner surface of the through hole of the fastening fitting is in contact with the rope to restrict the rope, and the member for expanding the diameter presses the peripheral line other than the center line of the rope to the through hole Partial cutaway view of the state of the inner surface.

Fig. 2 is a diagram showing an end of a rope to which a diameter-expanding member is attached, a rope end fitting, and a diameter-expanding member.

Fig. 3 is an enlarged cross-sectional view showing the distal side of the fastening structure of the present invention.

Symbol Description

1…rope

2… core wire

3…surrounding lines

5…end fittings

7…proximal end

9...remote end

11...through hole

13...inner peripheral surface

15...near opening

17...distal opening

20...Outer peripheral surface

21...2nd cone surface

23…Large diameter part

24…Conical surface

25…Trail Department

31...Parts for diameter expansion

33…bottom

35…Conical part

37...holes

Detailed ways

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The rope in this specification includes a rope formed by aligning or twisting a plurality of threads regardless of the material. Also, a rope formed by twisting a plurality of wires to form a strand and twisting the plurality of strands is included.

In addition, resin is impregnated into a single thread or a single thread formed by twisting a plurality of threads to form a composite material, and a plurality of threads composed of these composite materials are twisted to form a rope. Before twisting, the surface of the composite may be covered with fibers in sheet form, covered with resin, or wound with fibers to perform polishing treatment.

Specific examples of ropes include, for example, ropes made of high-elastic fibers such as synthetic fibers such as rubber, nylon, and polyester, or ropes made of epoxy resin, unsaturated polyester resin, or polyurethane. High-strength fiber composite cables formed by impregnating thermosetting resins such as ester resins into high-strength low-elongation fibers such as carbon fibers, aramid fibers, or silicon carbide fibers, and twisting multiple composite materials formed in this way as threads. .

In addition, high-strength fiber composite cables are suitable for reinforcement of concrete structures such as prestressed concrete bridges and trestles in corrosive environments, tensile members of high corrosion-resistant ground anchors, and reinforcement of overhead transmission lines with small deflection. Uses such as core materials, or reinforcements for non-magnetic concrete structures (for example, guide rails for maglev trains), etc. Hereinafter, the end fastening structure of the rope according to the present embodiment will be described by taking a carbon fiber composite cable, which is one type of high-strength fiber composite cable, as an example.

Referring to FIG. 1 , in this embodiment, a carbon fiber composite cable 1 is formed by impregnating carbon fibers into epoxy resin to form a composite material, winding polished fibers on the surface of the composite body to form a wire, and adding a plurality of the wires formed by twisting.

As shown in FIG. 2 , the carbon fiber composite cable 1 is 7 stranded wires twisted together with 7 wires, which has a core wire 2 in the center and 6 peripheral wires wound around the core wire 2 . Line 3. However, the carbon fiber composite material 1 may also be formed of an appropriate number of strands other than 7, for example, 19 strands or 37 strands.

In addition, in the case of 19 stranded wires, a carbon fiber composite cable generally has: a core wire; 6 first peripheral wires twisted around the core wire; and 12 wires further twisted around the first peripheral wire. The second peripheral threads, in the case of 37 twisted wires, include 18 third peripheral threads that are twisted together around the 12 second peripheral threads. In the figure, the end fitting 5 is explained in more detail. This fastening structure includes a wedge-shaped member 35 for diameter expansion. An end fastening tool for the carbon fiber composite material cable 1 is constituted by the end fitting 5 and the diameter-expanding member 31 .

As shown in Figure 1, the end fitting 5 is cylindrical as a whole, and a proximal opening 15 and a distal opening 17 are respectively provided at the proximal end 7 and the distal end 9, and the axially extending through hole (barrel hole) 11 makes these The openings 15, 17 communicate. A large-diameter portion 23 having a larger inner diameter is formed on the distal end 9 side of the through hole 11 , and a small-diameter portion 25 having a smaller inner diameter than the large-diameter portion 23 is formed on the distal end 9 side.

In addition, a tapered surface 24 that decreases in diameter from the side of the distal end 9 toward the side of the proximal end 7 and is inclined is provided at a portion from the large diameter portion 23 to the small diameter portion 25 .

The terminal metal fitting 5 as described above can be formed of metals such as steel, stainless steel, and aluminum, for example.

The diameter-expanding member 31 for expanding the diameter of the terminal end of the rope 1 is conical in this embodiment, and is formed to have a bottom surface 33, a conical surface 35 extending from the bottom surface 33 toward the front end, and the front end becomes circular, and The wedge shape of the hole 37 arranged in the axial direction. The hole 37 preferably has the same diameter as the core wire 2 of the carbon fiber composite cable 1 or a slightly larger diameter than the core wire 2 of the carbon fiber composite cable 1 .

The outer shape of the diameter-expanding member 31 is a cone in the illustrated example, but it may be a hemispherical shape, a cylindrical shape with a rounded tip, or the like as appropriate. In addition, the diameter-expanding member 31 may be constituted by a half-diameter-expanding member having a half-hole, and these half-diameter-expanding members may be combined at the time of use. The diameter-expanding member 31 can usually be formed of metals such as steel, stainless steel, and aluminum, but may also be formed of a material other than metal such as hard synthetic resin, for example.

In order to fasten the carbon fiber composite material cable 1 to the fastening fitting 5, first, insert the end of the carbon fiber composite material cable 1 from the proximal opening 15 of the end fitting 5 to the through hole 11, and make the front end of the cable 1 It protrudes from the distal opening 17 .

Next, untwisting the front end of the end of the carbon fiber composite cable 1 protruding from the distal opening 17 of the end fitting 5 to expose the core wire 2 at the center surrounded by the surrounding wire 3 ( FIG. 2 ). This can also be done with fingers. Then, the diameter-expanding member 31 is pressed into the core wire from the front end side of the conical portion 35 through the hole 37 to fit and fix it. A dedicated jig (not shown) can be used for this work. At this time, an adhesive or the like can be used as necessary to fix the diameter-expanding member 31 .

In addition, when the member 31 for diameter expansion consists of half of the member for diameter expansion, what is necessary is just to fit and fix it from both sides of the wire 2. FIG. In addition, in other embodiments, when the carbon fiber composite material cable 1 is composed of, for example, 19 stranded wires or 37 stranded wires, as the core wire, the wire located in the center and the first periphery surrounding the wire can also be selected. wires (6 wires) or the second peripheral wires (12 wires), and the member 31 for diameter expansion is fixed around these multiple wires.

After the diameter-expanding member 31 is pressed into the core wire 2 , the end of the carbon fiber composite cable 1 is pressed into the through hole 11 of the end fitting 5 . This can also be done using a dedicated jig (not shown). The diameter-expanding member 31 is press-fitted in a state in which six peripheral wires 3 are arranged along the circumferential direction on the conical surface of the conical portion 35 . The position where the diameter-expanding member 31 is press-fitted is in the vicinity of the tapered surface 24 of the end fitting 5 .

In addition, the end fitting 5 is pressed from the outside in the circumferential direction to reduce the diameter of the through hole 11 .

The inner surface of the through hole 11 comes into contact with the surface of the carbon fiber composite cable 1 due to the reduction in diameter due to the above pressing, and the carbon fiber composite cable 1 is restrained by the end fitting 5 . Thereby, the end fitting 5 can be firmly attached to the end of the cable 1 without using an adhesive or the like.

On the other hand, the diameter-expanding member 31 that is pressed into and fixed to the core wire 2 of the carbon fiber composite cable 1 is located in the through hole 11 at a position adjacent to the tapered surface 24 on the side of the distal opening 17, and the core wire The other 6 peripheral wires 3 are sandwiched between it and the tapered surface 24 . The peripheral wire 3 is pressed against the tapered surface 24 in a state where the peripheral wire 3 is arranged in the circumferential direction on the conical portion 35 of the diameter-expanding member 31 .

In this way, the diameter-expanding member 31 firmly fixes the cable 1 together with the tapered surface 24, and functions as a restrictive anchor. Thereby, the cable 1 is reliably prevented from coming off from the end fitting 5 . At this time, according to the present embodiment, since the tapered surface 24 and the conical portion 35 of the member 31 for expanding diameter have a large area with a complementary inclination, it is possible to secure a gap between the tapered surface 24 and the peripheral line 3 sandwiched between them. Large contact area or friction force, and make it achieve anchoring effect.

In addition, the inclination angle of the tapered surface 24 (and the conical portion of the diameter-expanding member) is set according to the expansion and contraction characteristics of the rope used, and is generally, for example, preferably in the range of 5° to 25° relative to the horizontal. The pressing effect is weak at 5 degrees or less, and it is not preferable at 25 degrees or more because corners are formed and cause shearing force.

In addition, the inner surface of the second tapered surface 21 on the proximal opening side, which is in contact with the cable 1 , is tapered to prevent the cable 1 from cracking at the mouth of the end fitting 5 .

In this way, according to the present utility model, the rope is restrained from the outer side in the circumferential direction by the protruding portion of a certain width protruding into the through hole of the end fitting and extending in the axial direction. Therefore, even if the rope is relatively radially Even in the case of a high-strength fiber composite cable with weak local shear force in the same direction, the shear load can not be applied, and the rope can be firmly fixed and detached.

In addition, the diameter-expanding member has an anchoring effect on the rope in the through hole, and the rope is firmly fastened to the end fitting. Similarly, even when the rope is a highly elastic rope such as rubber, which has a large elongation when stretched and whose cross-sectional area tends to change, it is possible to achieve a strong detachment prevention effect.

In addition, since no expansive filler such as cement is used, it is not necessary to precisely control the amount and temperature of the expansive filler at the work site. Therefore, according to the present invention, the fastening device can be easily installed on the end of the rope, and high fastening efficiency, fastening effect, and instant discovery of the fastening effect can be realized. Skill. In addition, the working time can be shortened significantly, and the improvement of working efficiency can be aimed at.

Although the preferred embodiment of the present invention has been illustrated and described, this is only an example and should not be interpreted as limiting the scope of the present invention. According to the description of this specification, there can be many modifications, changes, etc. without departing from the spirit and scope of the present invention, but it should be interpreted that these modifications, changes, etc. are included in the scope of protection of the present invention.

Claims (6)

1. A terminal fastening structure for a rope, characterized in that it comprises: A cylindrical end fitting, the end fitting has a proximal opening formed at the proximal end, a distal opening formed at the distal end, and a through hole communicating the proximal opening and the distal opening, and the through hole is formed There is a small diameter portion and a large diameter portion located on the opening side of the distal end; a rope inserted through said through hole; and a member for diameter expansion, which is inserted into the end portion of the rope located at the large diameter portion and expands the diameter of the end of the rope on the distal opening side, The diameter of the expanded end of the cord is larger than the diameter of the small diameter portion. the 2. The terminal fastening structure of the rope according to claim 1, characterized in that, The cord is constrained in the through hole by pressing the end fitting from the circumferential outside, making the diameter of the through hole smaller than the diameter of the cord and crimping the inner peripheral surface of the through hole with the outer surface of the cord. Inside. the 3. The terminal fastening structure of the rope according to claim 1, characterized in that, The inner peripheral surface from the small-diameter portion to the large-diameter portion is a tapered surface formed in a tapered shape. the 4. The terminal fastening structure of the rope according to claim 3, characterized in that, The tapered surface is formed when the end fitting is squeezed from the circumferential outside. the 5. The terminal fastening structure of the rope according to claim 1, characterized in that, The diameter-expanding member is inserted into a void of a plurality of strands or threads constituting the cord. the 6. The terminal fastening structure of the rope according to claim 1, characterized in that, The rope is a high-strength fiber composite cable including a carbon fiber composite cable formed by twisting a plurality of surrounding wires around a core wire. the