JPH0874382A - Pc steel material anchor wedge - Google Patents

Abstract

PURPOSE: To anchor an area between projected strips inside a wedge, which is rust- preventatively coated easily and to a satisfactory extent, to anchor the rust- preventatively coated PC steel material definitely where the wedge is designed to anchor the ends of the strained PC steel material. CONSTITUTION: A wedge interposed between an outer periphery of a PC steel material 10 inserted into a tapered hole 13 of an anchor 12 and an inner surface of the tapered hole 13, is provided with a large number of sharp edge-shaped steel material locking projected strips 15 which are placed in contact with the outer periphery of the PC steel material 10 at the circumferential direction where the cross section of each steel material locking projected strip is molded in the form of a crown like a saw blade. A parallel area 16 is installed in the axial direction of the PC steel material between each crown-like bottom. The width of the parallel area 16 is adapted to exceed that of the crown-like bottom of the steel material projected strips 15 while the height of the crown part is so arranged that the outer peripheral surface of a synthetic resin rust preventative covering 11 may come in contact with the parallel area 16 during anchorage of the PC strained material 10 coated with the synthetic resin rust preventative film. The whole surfaces of the steel material including both the inner and outer peripheral surfaces are coated with a synthetic resin-made rust preventative film 17.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wedge for fixing an end portion of a PC steel material used as a suspending material for cable-stayed bridges or a stress introducing material for prestressed concrete.

[0002]

2. Description of the Related Art Conventionally, fixing by means of a wedge is widely known as a method for fixing an end portion of a PC steel material. As shown in FIG. 6, the taper hole 2 is made to penetrate through the steel fixing body 1 and the end of the PC steel material 3 is inserted into the taper hole 2, and the PC steel material 3 is Inserting wedges 4 and 4 in which a cylinder is halved into a shape surrounding the outer peripheral surface into the tapered hole 2, the wedge-shaped steel material having a serrated cross section on the inner peripheral surface is engaged with the wedges 4 and 4. Plural projecting ridges (not shown) are provided in advance, and this is
The outer peripheral surface of the C steel material 3 is made to bite.

Further, in recent years, a PC steel material 3 and wedges 4 and 4 coated with a synthetic resin rustproof coating by electrodeposition coating have been developed because of the necessity of rustproofing including the fixing portion.

[0004]

In the above-mentioned conventional fixing wedge, when the synthetic resin coating is applied by electrodeposition coating, the valley portion between the steel material locking projections is not sufficiently coated. There was a problem.

Further, when this is used for fixing a PC steel material coated with a synthetic resin rustproof, there is a problem that a slip occurs between the fixing wedge and the PC steel material, and a desired tension cannot be obtained.

In view of such conventional problems, an object of the present invention is to provide a PC steel material fixing wedge in which the rust preventive coating of the wedge is easy and sufficient, and the PC steel material fixing with the rust preventive coating is completed. It was made as.

[0007]

The features of the present invention for solving the above-mentioned conventional problems and for achieving the intended purpose are that the taper of the fixing member for supporting the tension of the PC steel material which is strained. P inserted into the hole and inserted into the tapered hole
PC provided with a large number of sharp edge-shaped steel material locking projections which are interposed between the outer circumference of the C steel material and the inner surface of the tapered hole and which are in contact with the outer circumference of the PC steel material in the circumferential direction and are sharp in the circumferential direction. In the steel material fixing wedge, the cross section of each of the steel material locking protrusions is formed into a saw-tooth-shaped mountain shape, and P is provided between the hem portions of each mountain shape.
This is because the parallel portion was provided in the axial direction of the C steel material and the rust preventive coating made of synthetic resin was applied to the entire inner and outer peripheral surfaces.
In addition, the width of the parallel portion is set to be equal to or larger than the width of the hem of the mountain shape of the steel locking protrusion, and the height of the mountain shape is a PC with a synthetic resin rustproof coating
It is preferable that the outer peripheral surface of the synthetic resin anticorrosive coating layer of the PC tension material does not contact the parallel portion when the tension material is fixed.

[0008]

In the PC steel material fixing wedge of the present invention, since there are parallel portions between the steel material locking ridges, sharp-angled concave portions are eliminated, and a suitable coated state by electrodeposition or the like can be obtained on the entire surface.

Since a large space is formed between the steel locking projections, a PC having a synthetic resin rustproof coating layer on the outer surface
When fixing steel materials, the synthetic resin coating material that has been pushed away by the steel locking projections enters with a margin between the projections.
The PC steel material is securely locked.

[0010]

EXAMPLE An example of the present invention will be described with reference to FIGS.

FIG. 1 shows an example of a PC steel material fixing portion used for a wedge according to the present invention. In the figure, 10 is a PC steel material, 11 is a rust preventive coating layer made of a synthetic resin paint, and 12 is a synthetic resin paint.
Is a fixing member, and 13 is a tapered hole formed in the fixing member 12.

Into the tapered hole 13, wedge-shaped PC steel material fixing wedges 14, 14 each having a tapered outer surface are inserted. As shown in FIG. 2, the wedge 14 has an outer surface formed into a taper shape matching the taper of the tapered hole 13, and an inner surface formed into a semi-cylindrical shape surrounding the outer circumference of the PC steel material 10. Many steel projections 15, 15 ...
Are integrally molded parallel to each other in the circumferential direction.

The ridges 15, 15 ... Are formed in a mountain shape having a saw-tooth cross section. This chevron may have an upright surface 15a with one side upright as shown in FIG. 3 and an inclined surface 15b with the other side inclining, or both sides can be inclined as shown in FIG. The surfaces 15b and 15b may be used.

Between the ridges of the projections 15, 15 ... There are flat cylindrical parallel portions 16, 16 ... And the wedge 14 including the parallel portions 16 and the outer peripheral surfaces of the projections 15. Anticorrosion coating layer 17 whose entire peripheral surface is coated with synthetic resin paint by electrodeposition coating
Is being worn.

Further, as shown in FIG. 5, the width a of the parallel portion 16 between the ridges 15 is formed larger than the maximum width b of the skirt of the ridge 15, and the height of the ridge 15 is rustproof. When the coated PC steel material 10 is gripped, it is formed to a height such that a gap is formed on the outer peripheral side of the parallel portion between the ridges 15 in a state where the tip of the coated PC steel material 10 is embedded in the PC steel material 10. Therefore, it is preferable that the thickness is about twice or more the sum of the thicknesses of the rustproof coating layers 11 and 17 of the PC steel material 10 and the wedge 14.

When the wedge 14 is used to grip the PC steel material 10, as shown in FIG. 5, when the tip of the ridge 15 bites into the PC steel material 10, the tip portion of the ridge 15 is held. And the respective rust-preventive coating layers 11 on the outer periphery of the PC steel material 10,
17 is turned up and pushed away by the biting of the ridges 15, but the pushed-out portion is inserted between the ridges 15 and 15 with a margin, and the ridges 15 are sufficient for the PC steel material 10. Biting is done.

[0017]

As described above, in the PC steel material fixing wedge of the present invention, since the parallel portions are provided between the skirts of the projecting ridges having a mountain-shaped cross section, the rust preventive coating by electrodeposition coating is easy and When the PC steel material coated with rust is fixed and fixed by this wedge,
The rustproof coating layer pushed away by the bites of the ridges enters the wide space between the ridges with a margin, and a sufficiently strong fixing state can always be obtained.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of an end fixing structure for a PC steel material using a wedge according to the present invention.

FIG. 2 is an inclined view of the wedge of the same.

FIG. 3 is a partially enlarged cross-sectional view showing an example of the protrusion shape of the above wedge.

FIG. 4 is a partially enlarged cross-sectional view of another example of the same.

FIG. 5 is a partially enlarged cross-sectional view showing a PC steel material gripped state by a wedge according to the present invention.

FIG. 6 is a cross-sectional view showing a conventional PC steel material edge fixing structure using a wedge.

[Explanation of symbols]

 10 PC Steel Material 11, 17 Anticorrosion Coating Layer 12 Fixing Body 13 Tapered Hole 14 Wedge 15 Protrusion 15a Upright Surface 15b Sloping Surface 16 Parallel Section

Claims (2)

[Claims] 1. A PC steel material which is inserted into a taper hole of a fixing body for supporting tension of PC steel material which is strained, and which is interposed between an outer circumference of the PC steel material inserted into the taper hole and an inner surface of the taper hole. In a PC steel material fixing wedge comprising a large number of sharp edge-shaped steel material locking projections directed in the circumferential direction on the inner peripheral surface in contact with the outer circumference of a saw blade, the cross section of each steel material locking projection is a saw blade. In addition to forming into a mountain-shaped chevron, parallel parts were provided between the crests of each chevron in the axial direction of the PC steel material, and a synthetic resin rustproof coating was applied to the entire inner and outer peripheral surfaces. A characteristic PC steel material fixing wedge. 2. The width of the parallel portion is set to be equal to or larger than the width of the ridge of the mountain shape of the steel locking projection, and the height of the mountain shape is set at the time of fixing the PC tension material coated with the synthetic resin rust preventive coating. The PC steel material fixing wedge according to claim 1, wherein an outer peripheral surface of the synthetic resin anticorrosive coating layer of the PC tension member has a height which does not contact the parallel portion.