JPH0116799Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention involves inserting a cable such as a prestressed steel wire or a prestressed steel wire into the sheath of a prestressed concrete structural material from one end and pulling it out from the other end. This relates to a cable pull-out fitting for the purpose.

[Prior Art] A jig for pulling out a cable made of a bundle of steel wires includes a twill net having a pull-out rope 2 as shown in Fig. 4, and a jig having a connection port at the tip. was used. However, these jigs have a large outer diameter, and when the cable is pulled out, a very large load is applied to the cable due to friction, so the cable may come off from the jig.

Furthermore, since the latter jig has an extremely large outer diameter, it is difficult to insert the cable into the inside of the sheath, which necessitates increasing the inner diameter of the sheath.

[Problems to be solved by the invention] The purpose of the invention is to create an inexpensive cable extraction fitting that has a small outer diameter and is easy to insert into the sheath by fitting the end of the cable into a sleeve and crimping it. It is about providing.

[Means for Solving the Problems] In order to achieve the above object, the structure of the present invention is to provide a cylindrical part through which the end of the cable is inserted and crimped, and is made by aligning a large number of wires with a substantially circular cross section. A screw shaft is formed on the end wall of the sleeve, and a bracket having a bifurcated portion for connecting the pull-out rope with a pin is screwed onto the screw of the sleeve.

[Function] The drawer fitting according to the present invention can be fixed to the end of a cable such as a PC steel wire, a PC stranded wire, or a wire rope by simply crimping it.

The cable pull-out fitting according to the present invention applies a friction material to the cylindrical portion 8 of the sleeve 15, and inserts a large number of cables 14 arranged in a circular cross-section into the cylindrical portion 8.
Apply crimping process. The crimping process is performed using dies or presses, but dies give a better finish.

According to the present invention, the sleeve 15 having the crimped portion 7 and the bracket 10 for attaching the pull-out rope 2 are connected by screws. The cable is easily pulled out by connecting a predetermined length of pull-out rope 2 to the bifurcated bracket 10 with a pin 13, inserting it into the inside of the sheath, and pulling it out with a winch or the like.

[Embodiment of the invention] As shown in FIGS. 1 to 3, the cable pull-out fitting according to the invention is provided by coating the inside of the cylindrical portion 8 of the sleeve 15 with carborundum or grit as a friction material, or by applying PC. A coiled hardened wire is wound around a steel wire, and the cable 14 is inserted. The bracket 10 is coupled to the sleeve 15 by screwing the threaded shaft 5 formed on the end wall of the sleeve 15 into the threaded hole 11 of the bracket 10. A pin 13 for hooking the pull-out rope 2 is removably fitted into the pin hole 12 of the bifurcated part 9 of the bracket 10.

To connect the end of the cable to the sleeve 15, the cable 14, which is made of, for example, 12 stranded PC steel wires arranged in a substantially circular cross section, is inserted into the cylindrical portion 8 of the sleeve 15. Next, about 30% crimping is performed using a die-type crimping machine (extrusion type), and the sleeve 15 is fixed to the cable 14. sleeve 15
The cable 14 to which the cable 14 is fixed is introduced into the inside of the sheath by connecting the pull-out rope 2 to the pin 13 of the bracket 10 as described above.

[Effects of the invention] As described above, the present invention forms a threaded shaft on the end wall of a sleeve provided with a cylindrical part into which the end of a cable is inserted and crimped, and is made by aligning a large number of wires with a substantially circular cross section. On the other hand, since a bracket having a bifurcated part for connecting the pull-out rope with a pin is screwed onto the sleeve, the outer diameter can be adjusted by simply fitting and crimping the cable into the sleeve and connecting the pull-out rope to the bracket. The cable is small, allowing the cable to be inserted smoothly even in an S-shaped sheath, and the sleeve does not come out due to frictional drag. For example, outer diameter 38mm
The outer diameter of the sleeve after crimping is 53 for a cable of
mm, and can withstand a tensile load of 20 tons or more.

Since the sleeve with the crimping part and the bracket for attaching the pull-out rope are constructed separately, the sleeve can be made of a relatively soft material that can be easily crimped, and the bracket can be made of a material with high tensile strength.

[Brief explanation of drawings]

Fig. 1 is a side view of a cable pull-out fitting according to the present invention, Fig. 2 is a side cross-sectional view of a sleeve of the pull-out fitting, Fig. 3 is a side cross-sectional view of a bracket of the pull-out fitting, and Fig. 4 is a side view of a conventional cable pull-out fitting. It is a side view of a drawer metal fitting. 5: Threaded shaft portion, 6: Non-crimped portion, 7: Crimped portion, 8: Cylindrical portion, 9: Bifurcated portion, 10: Bracket, 11: Screw hole, 13: Pin, 14: Cable, 15: Sleeve.

Claims (1)

[Scope of utility model registration request] A threaded shaft is formed on the end wall of the sleeve, which has a cylindrical part into which the end of the cable is inserted and crimped, which is made by aligning a large number of wires with approximately circular cross sections. A cable pull-out fitting, characterized in that a bracket having a bracket is screwed onto a screw of the sleeve.