JP3831817B2 - Rust prevention coated PC steel edge fixing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for fixing an end portion of a rust-proof coated PC steel material in which an outer surface of a PC steel material having a circular cross section such as a PC steel rod or a PC steel wire is coated with a rust-proof material.
[0002]
[Prior art]
Conventionally, in order to fix a rust-proof coated PC steel material 3 in which the outer peripheral surface of a PC steel material 1 having a circular cross section such as a PC steel rod or PC steel wire is coated with a rust-proof material 2, as shown in FIG. A bolt-shaped screw portion 4 is provided at the end of the steel material 1, the screw portion 4 is passed through an insertion hole 6 formed in the fixing body 5, and a nut is attached to the screw portion 4 in a state where the rust-proof coated PC steel material 3 is tensioned. 7 is screwed, and the nut 7 is tightened until it abuts against the pressure bearing plate 9 supported by the concrete structure 8, thereby fixing the end portion of the rust-proof coated PC steel material 3.
[0003]
[Problems to be solved by the invention]
However, in the conventional technology as described above, since it is difficult to apply a rust-proof coating to the screw portions at both ends of the PC steel material, the rust-proof coating is applied only to the portions excluding the screw portions at both ends of the PC steel material. There is a problem that rust is likely to be generated from a screw portion that is not provided with a rust-proof coating.
[0004]
In addition, in the rust-proof coated PC steel material as described above, there is a problem in that a cross-sectional defect occurs due to the provision of the screw portion, and the proof stress in the tensile direction is reduced. Conventionally, when using such a rust-proof coated PC steel material, Is designed so that its effective cross section is about 90% of the actual cross section.
[0005]
In view of the state of the prior art as described above, the present invention is a rust-preventing coated PC without degrading the performance of the PC steel in a state in which the entire PC steel having a circular cross section such as a steel bar or steel wire is suitably rust-prevented. An object of the present invention is to provide a method for fixing an end portion of a rust-proof coated PC steel material for fixing an end portion of a steel material to a fixing body.
[0006]
[Means for Solving the Problems]
In order to solve the conventional problems as described above and achieve the intended purpose, the method of fixing an end portion of a rust-proof coated PC steel material according to claim 1, wherein the outer peripheral surface of the PC steel material having a circular cross section is made of a synthetic resin. After the end of the rust-prevention-coated PC steel coated with the rust-preventive material is inserted into the insertion hole formed in the fixing body, the end of the rust-prevention-coated PC steel is formed into a shape in which the tapered cylinder is vertically divided. A rust preventive material that is formed and has a large number of locking blades that bite into the outer peripheral surface of the rust-proof coated PC steel material formed along the circumferential direction on the inner peripheral surface, and peeled off when the locking blade bites into The rust-preventing coated PC is inserted between the fixing wedge having a relief portion composed of a slit hole penetrating in the thickness direction and inserted into the insertion hole in a state in which the rust-preventing coated PC steel material is in tension. Fix the end of the steel material to the fixing body. The features.
[0007]
By constituting in this way, it is possible to apply a rust-proof coating to the end of a PC steel material having a circular cross section such as a steel bar or steel wire, and it is possible to suitably prevent the occurrence of rust and to provide a screw part Therefore, it is possible to prevent cross-sectional defects and to obtain a high yield strength.
[0008]
In the invention according to claim 2, the end portion of the rust-prevention-coated PC steel material in which the outer peripheral surface of the PC steel material having a circular cross section is coated with the rust-proof material made of synthetic resin is inserted into the insertion hole formed in the fixing body. After that, the end of the anticorrosion-coated PC steel material is formed into a shape in which a tapered cylinder is vertically divided, and a large number of bites into the outer peripheral surface of the antirust-coated PC steel material formed along the circumferential direction on the inner peripheral surface The fixing wedge is sandwiched between fixing wedges having a relief portion composed of a round hole penetrating in the thickness direction, which has a locking blade, and into which a rust preventive material that has been peeled off when the locking blade bites, enters the fixing wedge. By inserting the coated PC steel material into the insertion hole in a tensioned state, the end portion of the rust-proof coated PC steel material is fixed to the fixing body .
[0009]
By comprising in this way, even if it is PC steel materials which have circular cross sections, such as a steel bar and a steel wire, it can be suitably hold | maintained with a wedge, and can be fixed without providing a screw part.
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Next, the end fixing method for the rust-proof coated PC steel material according to the present invention will be described. In addition, the same code | symbol is attached | subjected to the part same as the above-mentioned Example, and description is abbreviate | omitted.
[0011]
FIG. 1 shows an end fixing state of a rust-proof coated PC steel material, in which a reference numeral 10 is a rust-proof coated PC steel material, 8 is a concrete structure, and 9 is a bearing plate supported by the concrete structure 8.
[0012]
As shown in FIG. 2, the rust-proof coated PC steel material 10 is formed of a synthetic resin on the outer peripheral surface of a PC steel material 11 having a circular cross section such as a steel bar or a steel wire over the entire axial direction, that is, up to both ends. A rust material 12 is coated.
[0013]
The rust-proof coated PC steel material 10 is inserted into the insertion hole 14 formed in the fixing body 13 and then pulled against the support plate 9 supported by the concrete structure 8 by a jack (not shown) or the like, In this state, the end portions of the rust-proof coated PC steel material 10 are sandwiched between the fixing wedges 15 and 15, and the fixing wedges 15 and 15 are inserted into the insertion holes 14 formed in a tapered shape while the rust-proof coated PC steel material 10 is gripped. As a result, the end portion is fixed to the fixing body 13.
[0014]
The fixing wedge 15 is formed in a shape in which the tapered cylinder is divided into two vertically, and locking blades 16, 16... Are formed on the inner peripheral surface thereof with an interval in the axial direction.
[0015]
The locking blade 16 is formed along the circumferential direction, and the cutting edge penetrates the rust preventive material 12 that covers the outer periphery of the PC steel material 11, but is slightly digged into the outer peripheral surface of the PC steel material 11. It has become sharp.
[0016]
Further, the fixing wedge 15 is provided with an escape portion into which the rust preventive material 12 peeled off when the locking blade 16 bites into the outer periphery of the rust preventive coated PC steel material 10 is formed.
[0017]
As shown in FIG. 3 , the escape portion is formed by forming a slit hole 20 penetrating the fixing wedge 15 in the thickness direction. Moreover, as shown in FIG. 4, you may comprise by forming the round hole 21,21 ... penetrated in the thickness direction between the locking blades 16 and 16. As shown in FIG.
[0018]
When the rust preventive material 12 covering the outer periphery of the PC steel material 11 is peeled off by the engagement blade 16 biting in by providing the escape portion in this way, the peeled rust preventive material 12 enters the escape portion. It is preferably excluded from the outer peripheral surface of the PC steel material 11. Therefore, the inner peripheral surface of the fixing wedge 15 is suitably locked to the rust-proof coated PC steel material 10 without peeling off the rust-proof coating.
[0019]
【The invention's effect】
As described above, the end fixing method of the rust-preventing coated PC steel material according to the present invention includes the end portion of the rust-preventing coated PC steel material with the rust-proof coating applied to the end portion of the PC steel material having a round cross section. It can be fixed and durability is improved.
[0020]
Further, since it is not necessary to provide a threaded portion, a cross-sectional defect does not occur, and design can be performed based on an actual cross-section without causing a decrease in yield strength.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an end fixing state of a rust-proof coated PC steel material according to the present invention.
FIG. 2 is a cross-sectional view showing a rust-proof coated PC steel material in FIG.
3A is a front view showing an example of a fixing wedge, FIG. 3B is a plan view thereof, and FIG. 3C is a longitudinal sectional view thereof.
4A is a front view showing another example of a fixing wedge, FIG. 4B is a plan view thereof, and FIG. 4C is a longitudinal sectional view thereof.
FIG. 5 is a cross-sectional view showing an end fixing state of a conventional rust-proof coated PC steel material.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 10 Antirust coating PC steel material 11 PC steel material 12 Antirust material 13 Fixing body 14 Insertion hole 15 Fixing wedge 16 Locking blade 20 Slit hole 21 Round hole

Claims (2)

After the end portion of the rust-prevention-coated PC steel material, in which the outer peripheral surface of the PC steel material having a circular cross section is coated with a rust-proof material made of synthetic resin, is inserted into the insertion hole formed in the fixing body, the end, the tapered tube is formed in a shape in silos, which has a number of locking blades biting into the outer peripheral surface of the anticorrosive coating PC steel formed on an inner peripheral surface along a circumferential direction, the In a state where the rust preventive coating PC steel material is tensioned by sandwiching the fixing wedge having a relief portion composed of a slit hole penetrating in the thickness direction into which the rust preventive material peeled off by the locking blade enters. An end fixing method for an antirust coated PC steel material, wherein the end portion of the antirust coated PC steel material is fixed to the fixing body by being inserted into the insertion hole. After the end portion of the rust-prevention-coated PC steel material, in which the outer peripheral surface of the PC steel material having a circular cross section is coated with a rust-proof material made of synthetic resin, is inserted into the insertion hole formed in the fixing body, the rust-prevention-coated PC steel material The end portion is formed in a shape in which the tapered cylinder is vertically divided, and has a number of locking blades that bite into the outer peripheral surface of the rust-proof coated PC steel material formed along the circumferential direction on the inner peripheral surface, In the state where the rust preventive coating PC steel material is tensioned by sandwiching the fixing wedge having a relief portion composed of a round hole penetrating in the thickness direction into which the rust preventive material peeled off by the engagement blade enters. An end fixing method for an antirust coated PC steel material, wherein the end portion of the antirust coated PC steel material is fixed to the fixing body by being inserted into the insertion hole.

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