KR20170058574A

KR20170058574A - Tie cable bolt and manufacturing method thereof

Info

Publication number: KR20170058574A
Application number: KR1020150162317A
Authority: KR
Inventors: 나정숙
Original assignee: 나정숙
Priority date: 2015-11-19
Filing date: 2015-11-19
Publication date: 2017-05-29

Abstract

The present invention relates to a tie cable bolt and a method of manufacturing the same, which can simplify a manufacturing process of a tie cable bolt by pressing a cable composed of a PC stranded wire at one time by using a split wedge, Is formed of alloy steel having a hardness higher than that of the PC strand 20 and the pressing projection 32 is formed on the inner surface so that the pressing projection 32 of the wedge 30 penetrates the PC strand 20 and enters the sleeve 10, (20) are integrally formed. In the manufacturing method, a male thread is previously formed on the outside of a sleeve having a tapered press-in hole formed therein, and then a wedge is inserted and only a simple pressing operation is performed. The manufacturing cost can be reduced by reducing the equipment and personnel required.

Description

TECHNICAL FIELD [0001] The present invention relates to a tie cable bolt and a manufacturing method thereof,

The present invention relates to a tie cable bolt and a method for manufacturing the tie cable bolt, and more particularly, to a method of manufacturing a tie cable bolt using a split wedge, The wedge is made of an alloy steel having hardness higher than that of a PC strand and has a compression protrusion formed on the inner surface of the wedge so that the compression protrusion digs into the PC stranded wire and the PC stranded wire is integrated with the sleeve, It is necessary to insert the PC strand and the wedge in order to clamp the PC strand and the wedge so that the PC strand is rotated together with the PC strand when the PC strand is pressed onto the sleeve and then the outer thread is machined outside the sleeve. Securing the work space according to the length of the PC strand and its troublesome work It will have to be solved at once.

The tie cable bolt shrinks the sleeve while cold crimping the wire rope used for fixing and moving assemblies of concrete structures or steel structures and high-strength sleeves processed at both ends of PC strands or at either end by using a hydraulic press So that the cable and the round bar can be integrated with each other, and then the sleeve can be screwed onto the surface of the sleeve so that the nut can be fastened thereon.

Patent Literature 1 relates to a die and a sleeve for manufacturing a tie cable bolt in Korean Patent No. 10-0558595, which is a prior art patent of the present invention. This is because when a sleeve of a metallic material is pressed onto one end of a cable, Wherein a compression die and a guide die are provided in a support die so as to press the sleeve against the cable so that the sleeve is not bent and the sleeve is not pressed against the compression die and the compression die has a tapered inclined portion in which the sleeve is first inserted, Wherein the inner diameter of the guide die is smaller than the inner diameter of the first presser die, and the inner diameter of the guide die is smaller than the inner diameter of the first presser die, And the sleeve has the same outer diameter from the rear end to the distal end And a lubricating oil insertion groove for reducing friction when passing through the compression die is formed in a spiral shape on the back surface.

On the other hand, in the conventional tie cable bolt and manufacturing method of the prior art including the above-described Patent Document 1, the above-described compression die is used to crimp a PC stranded wire to a sleeve made of an alloy steel having a material that is softer than a PC stranded wire, The length of the PC strand integrated with the sleeve is so long that not only inconvenience of post processing is required but also a considerably large space is required for processing the sleeve. There was a considerable noise and dust, and the work environment was poor. In addition, there was a problem such that excessive labor and time were required for post-processing of such a sleeve.

Korean Registered Patent No. 10-0558595 (Registered on March 2, 2006) Die and Sleeve for manufacturing tie cable bolts

SUMMARY OF THE INVENTION The present invention has been made in order to solve the above-mentioned problems, and it is an object of the present invention to provide a press apparatus which can press with a simple press apparatus without having to manufacture an expensive press die, And it is an object of the present invention to provide a tie cable bolt of an improved structure which does not cause deformation and can eliminate various troubles during screwing of the sleeve surface after the crimping, and a method of manufacturing the same.

According to an aspect of the present invention, there is provided a light guiding apparatus comprising: a sleeve having a tapered press-in hole formed therein and having a male screw on the outside; A PC stranded wire of a predetermined length inserted into the tapered press-in hole; And a split wedge inserted in the rear of the tapered press-in hole of the sleeve and press-fitted in the front of the press-in hole, thereby forming a compression protrusion on the inner surface so as to be pressed while digging the inner PC strand.

Preferably, the split wedge is formed so as to increase the number of splits in proportion to the thickness of the PC strand, and the outer surface of the split wedge is provided with a PC stranded wire (cable) covered with the rear end of the sleeve, An O-ring groove into which an O-ring is inserted is formed.

A method of manufacturing a tie cable bolt according to the present invention includes: a sleeve processing step of forming a tapered press-in hole of a cold-rolled-back light inside and forming a male thread on the outside;

A splitting wedge processing step of forming a pressing projection on the inner surface;

Inserting a PC stranded wire into the press-in hole in front of the tapered press-in hole;

A wedge compression step of inserting a split wedge at the rear of the tapered press-in hole of the sleeve and pushing the split wedge forward using a compression press so that the compression protrusions inside the split wedge are pressed into the PC stranded wire .

In the wedge-forming step, spiral-shaped compression protrusions are formed on the inner surface, and O-ring grooves are formed on the outer surface of the outer surface to sandwich O-rings for watertightness maintenance.

The tie cable bolt according to the present invention and the method of manufacturing the same according to the present invention are superior to the conventional method of inserting the PC stranded wire into the sleeve and then pressing the sleeve through the compression die and then machining the male thread on the sleeve surface through the post- Since the wedge press-in operation is possible and only the press equipment for pressing the split wedge is used without using a separate press die, the manufacturing cost can be reduced due to the simplification of the equipment and the unnecessary pressure die, It is possible to eliminate the troublesomeness in the post-processing because the male thread is processed on the sleeve surface by the wire processing without post-processing on the outer surface of the sleeve in which the stranded wire is integrated, thereby improving the workability and damaging the sheath of the PC strand It is possible to prevent such a problem.

1 is a perspective view showing a state before a wedge and a PC stranded wire are inserted into a sleeve of a tie cable bolt according to the present invention,
FIG. 2 is a perspective view showing a state after the PC stranded wire and the wedge are inserted into the sleeve of the tie cable bolt shown in FIG. 1,
3 is a sectional view taken along the line A-A in Fig. 2,
4 is an enlarged sectional view taken along the line B-B in Fig. 2,
5 is a view showing a manufacturing process of a tie cable bolt according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 to 4 show a tie cable bolt according to an embodiment of the present invention. In the tie cable bolt 1 according to the present embodiment, a tapered press-in hole 12 is formed in the inside of the tie- A sleeve 10 having a male thread 14 formed therein;

A PC stranded wire (20) inserted into the tapered press-in hole (12) of the sleeve (10);

Is formed on the inner surface of the sleeve 10 so as to be pressed and inserted into the inner PC strand 20 by being inserted from the rear of the tapered press-in hole 12 of the sleeve 10 and being pressed into the front of the press- Type wedge 30 as shown in FIG.

Reference numeral 16 denotes a nut coupled to the male screw 14 formed on the surface of the sleeve 10. The nut 16 is separately assembled after manufacture of the tie cable bolt 1 and is delivered along the male screw 14 And adjusts the tension of the tie cable while adjusting its position before and after.

In the present embodiment, the sleeve 10 is made of S45C, which is one kind of carbon steel, and has a carbon content of about 0.45 and has excellent rigidity such as tensile strength. The PC strand 20 is shown as PC7 twisted wire, The present invention is not limited to this, and it is also possible to use various kinds of PC stranded wires of various sizes, and it is also possible to insert a plurality of strands of PC stranded wires all at once into the sleeve and to fix them by a split wedge. Wire rope or cable.

In the present embodiment, the split wedge 30 is manufactured by machining a round bar made of SNCM, that is, nickel-chrome-molybdenum alloy steel, which has hardness higher than that of the PC strand 20.

The method of machining the split wedge 30 is also obvious to those skilled in the metal working field, so a detailed description thereof will be omitted.

In the present embodiment, the split wedge 30 is of a three-split type, but the present invention is not limited to this. The split wedge 30 may be manufactured in two or more pieces, and the size of the sleeve So that the number of divisions can be increased.

The split wedge 30 is literally formed in the shape of a wedge with a front part thin and a thick wedge on the rear part. The inner surface of the split wedge 30 has a circular arc shape in contact with the PC stranded wire 20, In this embodiment, the compression protrusions 32 are formed in a female screw shape (spiral shape).

In the present invention, the compression protrusions 32 may be formed in a simple serrated shape in addition to the spiral shape. In addition, the compression protrusions 32 may be formed in various shapes so as not to be slipped on the surface of the PC strands.

An O-ring groove 34 is formed in the rear of the outer surface of the wedge 30 to receive an O-ring 36 for blocking the inflow of water into the PC strand through the rear end of the sleeve. The inserted O-ring 36 also serves to assist in arranging the split wedge 30 so as to surround the PC stranded wire in addition to the watertight holding function.

The ratio of the length of the split wedge 30 to the thickness of the split wedge 30 according to the present invention is not limited to the embodiment shown in the drawing and can be variously manufactured according to the length, , And the shape of the split wedge 30 shown and described in the present embodiment is merely constructed based on a test manufactured and tested by the present applicant.

5 shows a manufacturing process of a tie cable bolt according to the present invention, which includes a sleeve machining step S10, a split wedge machining step S20, a PC stranded wire embedding step S30, and a wedge pressing step S40 &Lt; / RTI >

The sleeve machining step (S10) and the split wedge machining step (S20) need not be distinguished from each other.

In the sleeve processing step (S10), a round bar having a predetermined length is formed inside the material, and a tapered press-in hole (12) is formed in the back surface of the barrel and a male screw (14) is formed on the surface.

Since the method of forming the press-in hole 12 and the male screw 14 is well known to those skilled in the art, a detailed description thereof will be omitted. However, in the present invention, The method is different from that of the prior art tie cable bolts including Patent Document 1 in that the male thread 14 is formed on the surface of the sleeve 10 before the PC strand 20 is squeezed, So that the formation of the male screw can be easily and effectively performed.

In addition, in the present invention, in forming the male thread on the outer surface of the sleeve, the work is performed before the PC strands are integrally press-fitted, so that when the male thread is formed, the PC strands are rotated together to damage the cloth, There is an advantage in that the work environment can be improved more favorably.

In the step of forming the split wedge (S20), the split wedge (three in the present embodiment, one set) is formed by forging, the compression protrusion (32) is formed on the inner surface thereof, An O-ring groove 34 into which the O-ring 36 for fitting the O-ring 36 is formed.

In the present embodiment, the compression protrusions 32 are formed in a helical shape, i.e., in the form of a female screw, and the compression protrusions 32 are formed in a serrated shape whose ends are inclined rearward, So that the PC stiffener 20 can exhibit effective resistance when subjected to a tensile force.

The PC stranded wire 20 is inserted into the press-in hole 12 at the front of the sleeve 10 and inserted into the rear end of the press-in hole 12 in the PC strand insertion step S30, The PC stranded wire 20 sandwiched between the tapered press-in hole 12 and the split wedge 30 may be sandwiched.

Next, the wedge pressing step S40 is a step of pressing the split wedge 30 fitted in the tapered press-in hole 12 of the sleeve 10 by forcibly pressing the split wedge 30 forward using a press (not shown) The compression projections 32 on the inner side of the split wedge 30 are pressed and squeezed into the PC stranded wire.

The tie cable bolt is manufactured through the above-described process. If necessary, the tie cable bolt having sleeves at both ends can be manufactured if the same process as that of the other end of the PC stranded wire 20 is performed, if necessary.

INDUSTRIAL APPLICABILITY As described above, according to the present invention, it is possible to manufacture a tie cable bolt with a simple structure by simply inserting a PC stranded wire into a press-fit hole of a sleeve having a male thread on its surface and press- As a result, it is possible to manufacture the tie cable bolt more economically than the conventional tie cable bolt and its manufacturing method.

1: Tie cable bolt
10: Sleeve
12: press-in hole
14: male thread
16: Nut
20: PC strand (wire rope, cable)
30: Split wedge
32: indentation projection
34: O-ring groove
36: O ring

Claims

A sleeve 10 in which a tapered press-in hole 12 of a forward end stop is formed and a male thread 14 is formed on the outside;
A PC stranded wire (20) inserted into the tapered press-in hole (12);
A split wedge 30 having a compression protrusion 32 formed on the inner surface thereof so as to be pressed and inserted into the PC strand 20 on the inner side by being inserted from behind the tapered press-in hole 12 and being press- And the tie cable bolt.

The method according to claim 1,
Wherein the compression projection (32) on the inner surface of the split wedge (30) is formed in a spiral shape, and an O-ring groove (34) is formed on the outer surface of the rear surface of the split wedge (30).

A sleeve machining step (S10) of forming a tapered press-in hole of the forward end of the tube and forming a male thread on the outside;
A split wedge processing step (S20) of forming a compression protrusion on the inner surface;
Inserting a PC stranded wire into the press-in hole in front of the tapered press-in hole (S30);
A wedge compression step (S40) of inserting a split wedge at the rear of the tapered press-in hole and press-fitting the split wedge forward using a press so that the compression protrusion inside the split wedge presses the PC stranded wire while digging Wherein the tie cable bolt is made of a metal.

The method of claim 3,
In the wedge processing step (S20), a spiral-shaped compression protrusion is formed on the inner surface, and an O-ring groove is formed on the outer surface of the outer surface of the outer surface so as to sandwich an O-ring for watertightness maintenance.