JP2762900B2 - Fixing method of fixed end of unbonded PC steel wire - 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 for fixing a fixed end of an unbonded PC steel wire.

[0002]

2. Description of the Related Art Conventionally, when an unbonded PC steel wire is installed on a floor or a beam, a fixed end of the unbonded PC steel wire is formed using a fixed end plate and a U-shaped bolt as shown in FIG. However, it is common to bind this fixed end to the main beam in the beam or column.

[0003]

SUMMARY OF THE INVENTION Conventional unbonded PC
According to the installation method of the fixed end of the steel wire, if the height position of the main beam is out of alignment, the height position of the fixed end of the unbonded PC steel wire will also be out of order. When the height position of the beam main reinforcement is out of order, it is also conceivable that the height position of the fixed end of the unbonded PC steel wire is adjusted while adjusting the height position of the fixed end, and the height position of the fixed end is maintained at the regular position. However, since such binding work is not easy, it is the actual condition that it is tied to the beam main bar without any special adjustment, and the work is carried out with poor accuracy of the height position of the fixed end of the unbonded PC steel wire. That is the fact.

According to the present invention, a fixed end of an unbonded PC steel wire is supported by a spacer, and the spacer is fixed to a form so that the height position of the fixed end of the unbonded PC steel wire can be adjusted regardless of the accuracy of the height position of the main beam. It is intended to be installed in a regular position.

[0005]

SUMMARY OF THE INVENTION The present invention provides a spacer having a fixed end of an unbonded PC steel wire from a rectangular fixed end plate, a compression grip and a rectangular clamping plate, while having two grooves on its upper surface. Is prepared, and the fixed end plate lower end and the tightening plate lower end of the unbonded PC steel wire fixed end are fitted into the respective grooves, and the spacer is fixed to the formwork. is there.

The first point of the present invention is the configuration and shape of the fixed end of the unbonded PC steel wire. The unbonded PC steel wire fixed end of the present invention has the same rectangular shape as a rectangular fixed end plate having an unbonded PC steel wire through hole and a plurality of bolt holes, and a plurality of fixed end plates corresponding to the plurality of bolt holes. It is composed of a clamping plate having a bolt hole and a compression grip. For the fixed end, insert the end of the unbonded PC steel wire (the sheath and trimming material at the end must be removed in advance or removed after insertion) into the through-hole of the unbonded PC steel wire in the fixed end plate, and then compress the end. After the grip is fitted and squeezed with a die, the clamping plate is abutted to the outside, and the fastening plate is tightened to the fixed end plate using a plurality of bolt holes with bolts. Are parallel and an unbonded PC steel wire extends from the center.

A second point of the present invention is the structure and shape of the spacer for supporting the fixed end plate of the fixed end and the clamping plate. The spacer has an upper surface supporting the fixed end and legs. The upper surface is formed by connecting a plurality of steel wires bent to the same shape, or is formed by bending a single plate. From the manufacturing surface, it is preferable to connect a plurality of steel wires bent to the same shape. The steel wire is fixed so that the lower end of the fixed end plate of the fixed end and the lower end of the fastening plate are fitted together.
It is bent in the same shape to form a groove of a stripe. Then, legs made of steel wires are welded to the plurality of steel wires constituting the upper surface, and the spacers are directly or indirectly fixed to the formwork by these legs.

[0008] Unbonded PC used in the present invention
The steel wire may be either a single wire or a stranded wire, but a stranded wire is often used. In addition, the present invention relates to one of the unbonded PC steel wires.
The same applies not only to the case where one fixed end is formed for each book, but also to the case where one fixed end is formed for a plurality of books when a plurality of bundles are used.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.

FIGS. 1A and 1B are plan views showing an example of a fixed end plate and a tightening plate used in the present invention. FIG. 1A shows an example of using one unit, and FIG. 1B shows an example of using two bundles.

(A) The single-use fixed end plate 2 is rectangular, has one unbonded PC steel wire through-hole 6, and two bolt holes 7, 7. I have. The fastening plate 3 is of the same type as the fixed end plate 2 and has two bolt holes 7,7.

(B) A fixed-end plate 2 using two bundles
Is rectangular and has two unbonded PC steel wire through holes 6,
6 are drilled, and two bolt holes 7, 7 are drilled. The fastening plate 3 used for two bundles is the same type as the fixed end plate 2 and has two bolt holes 7, 7.
Are perforated.

The formation of the fixed end of the present invention will be described with reference to FIG. The sheath at the end of the unbonded PC steel wire 1 is peeled off, and the trimming material is removed. This end is inserted into the unbonded PC steel wire through hole 6 of the fixed end plate 2.
The compression grip 4 is fitted to this end and drawn with a die, and the compression grip 4 is fixed to the end of the unbonded PC steel wire 1. The fastening plate 3 is brought into contact with the end of the unbonded PC steel wire 1, and the bolts 5, 5 are tightened with nuts through the bolt holes 7, 7 of the fastening plate 3 and the bolt holes 7, 7 of the fixed end plate 2.

In the case of (b), one fixed end is formed for the two unbonded PC steel wires 1, 1 in the same manner as in (a).

FIG. 2 shows an example of the spacer used in the present invention, wherein (a) is an elevational view, (b) is a plan view, and (c).
Is a side view.

The spacer 8 is assembled by welding two upper steel wires 9, 9, two leg steel wires 10, 10 and a lateral connection steel wire 13. The two upper steel wires 9, 9 are bent in the same shape, and two grooves 11, 12 are provided. The two leg steel wires 10, 10 are also bent in the same shape, and the upper ends are welded to two places before and after the two upper steel wires 9, 9 to serve as legs of the spacer 8 and the two upper steel wires 9. , 9 are connected. Holes for nails or screws are drilled at the lower ends of the leg steel wires 10 and 10. The laterally connected steel wire 13 is for maintaining the rigidity of the spacer 8 as an assembly, and is appropriately welded according to the length of the spacer 8, but is usually one or two.
When the length of the spacer 8 is short, it is not necessary to provide the spacer. The upper surface of the spacer 8 is formed by the two upper steel wires 9, 9, and the grooves 11 and 12 of the respective upper steel wires 9, 9 form the grooves that support the fixed end plate 2 and the tightening plate 3.

FIG. 3 shows another example of the spacer used in the present invention, wherein (a) is an elevation view, (b) is a plan view,
(C) is a side view.

The structure of the spacer 8 is almost the same as that of the spacer 8 shown in FIG. 2, except that the height of the spacer 8 can be adjusted. A nut 14 is welded to the lower part of the leg steel wires 10, 10, and a bolt 15 is screwed to the nut 14. By rotating the bolt 15, the height of the spacer 8 can be adjusted.

FIGS. 4 and 5 show an example in which a fixed end is installed in a beam or a pillar using the fixed end and the spacer of the present invention. FIG. 4 shows an example in which the fixed end is installed in a beam (a). Is a vertical sectional view, and FIG. FIGS. 5A and 5B show an example of installation in a pillar, wherein FIG. 5A is a vertical sectional view and FIG.

First, the case of installation in a beam according to FIG. 4 will be described.

The spacer receiving metal member 19 is fixed at a predetermined height of the beam formwork 18 horizontally. One leg steel wire 10 of the spacer 8 is placed on the spacer receiving metal 19 and fixed with nails or screws. The other leg steel wire 10 is placed on the floor form 17 and similarly fixed. The lower end of the fixed end plate 2 is fitted into the groove 11 of the fixed spacer 8, and the lower end of the fastening plate 3 is fitted into the groove 12. Thereby, the fixed end is accurately set at a predetermined height. Although not shown in the figure when the fitting state between the grooves 11 and 12 and the respective plates is loose, it is preferable to bind the respective plates to the spacers 8 with steel wires.

FIG. 5 shows an example in which two fixed ends are installed in a pillar.

The receiving pieces 20, 20 are mounted on the column formwork, and the spacer receiving hardware 19 is horizontally mounted thereon and fixed. The other spacer receiving hardware 19 is directly attached to the column formwork. The leg steel wires 10 and 10 of the spacer 8 are mounted on and fixed to the respective spacer receiving hardwares 19. Thereafter, the lower end of the fixed end plate 2 is fitted into the groove 11 of the fixed spacer 8 and the lower end of the tightening plate 3 is fitted into the groove 12 as in the case of the inside of the beam. Thereby, the fixed end is accurately set at a predetermined height. Similarly, when the fitting state is loose, it is preferable to bind the plates to the spacer 8 with a steel wire.

[0024]

The fixed end of the unbonded PC steel wire is supported by the spacer fixed at the correct height, so that the height of the fixed end of the unbonded PC steel wire can be set at a regular position.

[Brief description of the drawings]

FIG. 1 is a plan view showing an example of a fixed end plate and a tightening plate used in the present invention. FIG. 1 (a) is an example of using one unit, and FIG. 1 (b) is an example of using two bundles.

FIG. 2 shows an example of a spacer used in the present invention, wherein (a) is an elevation view, (b) is a plan view, and (c) is a side view.

3A and 3B show another example of a spacer used in the present invention, wherein FIG. 3A is an elevation view, FIG. 3B is a plan view, and FIG. 3C is a side view.

4A and 4B show an example in which an unbonded PC steel wire fixed end is installed in a beam according to the present invention. FIG.
Is a plan sectional view.

5A and 5B show an example in which a fixed end of an unbonded PC steel wire is installed in a pillar according to the present invention, wherein FIG.
Is a plan sectional view.

6A and 6B show an example in which a fixed end of a conventional unbonded PC steel wire is bound and installed on a main beam of a beam, where (a) is an elevation view of the fixed end, (b) is a plan view of the fixed end, and (c). Is an outer side view of the fixed end, (d) is an inner side view of the fixed end, (e) is a vertical sectional view in which the fixed end is tied to a beam main bar in the beam, and (f) is a beam main bar in the column with the fixed end. FIG.

[Explanation of symbols]

1. Unbonded PC steel wire, 2. Fixed end plate, 3
··· Tightening plate, 4 ··· Compression grip, 5 ··· Tightening bolt, 6 ··· Unbonded PC steel wire through hole, 7 ··· Bolt hole, 8 ··· Spacer, 9 ··· Top steel wire, 10 ·· Stand steel Wire, 11 ... fixed end plate support groove, 12 ... fastening plate support groove, 13 ... horizontal connecting steel wire, 14 ... height adjusting nut, 15 ... bolt, 16
..Main beam beams, 17- Floor formwork, 18- Beam formwork, 19-
・ Spacer receiving hardware, 20 ・ ・ Receiving piece, 21 ・ ・
Column formwork, 22 ... Steel wire

Claims (2)

(57) [Claims] 1. A fixed end of an unbonded PC steel wire is formed from a rectangular fixed end plate, a compression grip and a rectangular tightening plate, while a spacer having two grooves on an upper surface is prepared, and each groove is provided. A method of fixing a fixed end of an unbonded PC steel wire, wherein a lower end of a fixed end plate and a lower end of a tightening plate of the fixed end of the unbonded PC steel wire are fitted together, and a spacer is fixed to a mold. 2. The method for fixing an unbonded PC steel wire fixed end according to claim 1, wherein a spacer having adjustable length legs is used.