JP2720380B2 - PC steel wire tip protector - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method in which a plurality of concrete precast members are inserted into a sheath tube when a prestress is introduced and continuous using a PC steel strand.
The present invention relates to a PC steel stranded wire tip protector for preventing the tip of the PC steel stranded wire from returning to the inner wall surface of the sheath tube or the joint end, thereby preventing the twist of the PC steel stranded wire from returning.

[0002]

2. Description of the Related Art As a method of continuously connecting concrete precast members such as precast floor slabs and integrating them, a PC steel is inserted into a sheath tube B previously embedded in the member A as shown in FIG. There is a method in which a stranded wire C is inserted, a plurality of precast members are connected continuously, and a compressive force is introduced.

Usually, the precast floor slabs are provided with joints D which are fixed to each other, and as shown in FIG.
Is filled. Since the sheath tube B to be inserted is discontinuous at the joint, when the strand C of PC steel is fed in, the strand C of PC steel is caught at the discontinuous portion as shown in FIG. Not only does the insertion work become difficult, but the twist of the PC steel strand may return. In addition, the inner wall may return due to contact with the inner wall surface of the sheath tube or catching of other obstacles. In such a case, there are various methods of pulling back and pushing again or pushing harder. Such an operation is not only complicated but also requires a large amount of labor. Also, a material defect such as a return of the strand of the PC steel strand may occur.

[0004]

SUMMARY OF THE INVENTION The present invention prevents the tip of the PC steel stranded wire from returning, and
An object of the present invention is to provide a PC steel stranded wire tip protector with good workability.

[0005]

In order to achieve the above object, the present invention provides a nozzle-shaped nozzle having a conical head near the front end and a cylindrical PC steel wire holding part near the rear end. On the body,
A slit penetrating in the direction perpendicular to the axis and extending in the axial direction from the rear end to the vicinity of the tip is formed, and a bolt insertion hole is formed in the center of the main body by providing a screw in a direction perpendicular to the slit, and the bolt insertion hole is formed. Provided is a PC steel wire tip protection device formed by screwing a threaded bolt.

[0006]

1 to 3 show an embodiment of a PC steel strand tip protection device according to the present invention. FIG.
Is a plan view, FIG. 2 is a sectional view taken along line AA of FIG. 1, and FIG.
FIG. 2 is a sectional view taken along line BB of FIG. 1. In the figure, 1 is a main body,
2 is a head, 3 is a holding part, 4 is a slit, 5 is a bolt hole,
6 is a bolt.

The main body 1 has a nozzle-like shape as a whole, a conical head 2 near the front end, and a cylindrical PC near the rear end.
It is formed as a steel strand holding part 3. A slit 4 is formed in the main body 1, and the slit 4 penetrates in a direction perpendicular to the axis from the rear end to the vicinity of the front end of the main body 1, and extends in the axial direction. In the vicinity of the central portion of the main body 1, as shown in FIG.
Is provided with a screw, and a bolt 6 is rotatably screwed into the bolt insertion hole 5. Thus P as a whole
A steel wire tip protection device is formed. In this embodiment, only the wire holding portion 3 made of PC steel has a cylindrical shape, and has a shape that is solid from the vicinity of the center portion to the tip portion.
The whole may be cylindrical. In this case, the peripheral wall needs to be thick enough to form a bolt insertion hole with a screw.

[0008] The PC steel wire tip protection device thus constructed is used as follows. As shown in FIG.
Loosen the bolt 6, slightly widen the slit 4, and insert the PC steel stranded wire C into the PC steel stranded wire holding portion 3. When the PC steel strand C is inserted into the PC steel strand holding part 3, the bolt 6 is tightened to fit the slit 4, and the PC steel strand C is pressed by the peripheral wall 7 of the PC steel strand holding part 3. The wire is held by the wire holding unit 3. After the PC steel stranded wire C is held, the PC steel stranded wire tip protector is inserted from the head 2 of the main body 1 into the sheath tube of the concrete precast member to be continuous. The insertion of the PC steel wire tip protection device into the sheath tube is performed manually or by a feeding device.

[0009]

Since the present invention has been made as described above,
It has the following effects. That is, the configuration of the PC steel stranded wire tip protection device is penetrated in the direction perpendicular to the axis to a body having a conical head near the front end and a cylindrical PC stranded wire holding portion near the rear end. A slit is formed extending from the end to the vicinity of the tip, a bolt insertion hole is formed in the center of the main body by providing a screw in a direction perpendicular to the slit, and a threaded bolt is screwed into the bolt insertion hole. Therefore, by loosening or tightening the bolt, the width of the slit can be widened and narrowed, and the tip of the PC steel stranded wire can be easily held by the holding portion. As a result, even if the PC steel stranded wire is inserted into the sheath tube of the concrete precast member to be connected, the tip of the PC steel stranded wire is protected by the PC steel stranded wire tip protection device, so that the conventional structure is used. In this case, it is possible to prevent the twisting of the distal end portion of the PC steel stranded wire from being returned to the inner wall surface of the sheath tube, the discontinuous portion, or an obstacle.

[0010] Further, this PC steel wire tip protector is:
Since the tip portion has a conical shape, it easily advances in the sheath tube.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of an embodiment of a PC steel strand tip protection tool according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIG. 4 is a diagram illustrating the use of a PC steel wire tip protection tool.

FIG. 5 is an explanatory view showing the principle of connecting concrete precast members continuously by PC steel strands.

FIG. 6 is an explanatory view showing a state in which a strand of PC steel is hooked in FIG. 5;

FIG. 7 is an explanatory diagram showing a state in which the joint is filled with the joint material in FIGS. 5 and 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Main body 2 Head 3 PC strand holding part 4 Slit 5 Bolt insertion hole 6 Threaded bolt 7 Peripheral wall

Claims (1)

(57) [Claims] 1. A nozzle having a conical head near the front end and a tubular PC steel wire holding part near the rear end penetrates in a direction perpendicular to the axis of the nozzle. A slit extending in the axial direction is formed around the part, and a bolt insertion hole is formed in the center of the main body by providing a screw in a direction perpendicular to the slit, and a threaded bolt is screwed into this bolt insertion hole. PC steel stranded wire tip protector.