JPH0684655B2 - Fixing structure of polymer tension material - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fixing portion structure of a polymeric tension material developed for the purpose of fixing an end portion of a polymeric tension material made of a polymer material such as FRP. Is.

[Conventional technology]

Recently, polymer tension materials made of polymer materials such as FRP have been used as tension materials for prestressed concrete structures in addition to PC steel materials.

As a main fixing method for fixing the end portion of this kind of tension material, a fixing method using a wedge and a fixing method using an adhesive material such as non-shrink mortar are generally carried out.

[Problems to be Solved by the Invention]

However, these fixing methods have a few problems to be solved.

That is, the former has a problem that the surface of the tendon is scratched by wedges and sufficient fixing resistance cannot be obtained.

In addition, the fixing section is inevitably bulky.

On the other hand, for the latter, a non-shrink mortar or a filler such as a resin is used as an adhesive material, but the fixing length of the tension material needs to be considerably long in order to secure sufficient adhesive force, and the fixing tool becomes large. I have a problem to do.

The present invention is an improvement and development of the latter fixing method by adhesion in order to solve the above-mentioned conventional problems.
The fixing portion structure of the polymer tension material that can firmly and firmly fix the end portion of the polymer tension material, and can also shorten the fixing length as much as possible and have a compact structure. It is intended to be provided.

[Means for Solving the Problems]

The present invention relates to a fixing portion structure of a polymer tension material developed for the purpose of fixing the end portion of a polymer tension material composed of a polymer material such as FRP, and the inner hollow part of the fixing tube is made of a polymer tension material. The conical shape is formed so that the diameter becomes gradually smaller in the load end direction, and the end of the polymer tension material is inserted into the fixing tube from the load end side, and the Poisson's ratio The large filler is filled with a filler having a small Poisson's ratio on the free end side, and the boundary surface between the filler and the fixing tube is trimmed so that friction does not occur. The above object is achieved by adopting a configuration in which the portion is bent and inserted substantially in parallel along the inner surface of the fixing tube into the fixing tube.

〔Example〕

 The present invention will be described below with reference to an embodiment shown in the drawings.

In the figure, reference numeral 1 is a fixing pipe, which is made of high-strength concrete in a cylindrical shape, and is reinforced sufficiently by arranging reinforcing reinforcing bars 2 such as spiral reinforcing bars in the concrete. There is.

Further, the inner hollow portion 3 of the fixing tube 1 has a polymer tension member 5, which will be described later,
5 is formed in a conical shape such that the diameter gradually decreases in the load end direction of 5, and inside the hollow portion 3, friction of adhesion materials 7 and 8 described later on the fixing tube 1 is as much as possible over the entire surface thereof. The smooth surface 4 is formed by applying a resin material, grease, or a composite material thereof for the purpose of eliminating it.

Further, a required number of through holes 6, 6 are formed in the bottom portion of the fixing tube 1 for passing polymer tension members 5, 5 described later.

Then, through the through holes 6,6, the ends of a plurality of polymeric tensioning materials 5,5 are inserted into the hollow portion 3 of the fixing tube 1, and the adhesive materials 7 and 8 are filled around the ends thereof, whereby The ends of the molecular tension members 5, 5 are fixed.

The ends of the polymer tension members 5, 5 are bent and inserted in the hollow portion 3 along the inner surface of the hollow portion 3 in parallel.

As the adhering material 7, a material having a large Poisson's ratio (a Poisson's ratio of about 0.33 to 0.35) such as ordinary mortar or resin mortar material is used.
The bottom of the) is filled with a certain amount.

On the other hand, as the adhesive material 8, a material having a small Poisson's ratio such as non-shrink mortar (a Poisson's ratio of about 0.20 to 0.22) is used. It is filled more than 7.

In such a structure, when the tensile force acts on the polymeric tension members 5, 5, the fixing tube 1 and the adhesive members 7 and 8 are in an edge-cutting state, so that the adhesive members 7 and 8 are located inside the hollow portion 3. And a large vertical compressive force acts on the adhering material 7.

Furthermore, since a material having a large Poisson's ratio is used as the adhering material 7 and the circumference is completely restrained by the fixing tube 1, it is possible to strongly tighten the polymer tension materials 5 and 5 at the same time with the longitudinal compressive force. A large lateral compressive force is generated, which significantly enhances the fixing force of the polymeric tension members 5,5 fixing portion.

In the tensile test with the fixing structure shown in the figure (fixing length of 7 fixing 35 cm), slippage did not occur at the fixing portion, and the tension member broke. From this, it was confirmed that the present fixing device has a fixing force equal to or higher than the breaking strength of the tension member.

〔The invention's effect〕

Since the present invention is configured as described above, it has the following effects.

By using two adhesive materials having different Poisson's ratios at the ends of the polymeric tension material, it is possible to easily fix the material with a very simple structure.

Further, the inner surface of the hollow portion of the fixing tube is in an edge-cutting state with the adhering material, and the inner hollow portion of the fixing tube is formed in a conical shape such that the diameter becomes gradually smaller toward the load end of the polymeric tension material, and the higher diameter is further improved. Since the ends of the molecular tension material are bent and inserted substantially parallel to each other along the inner surface of the hollow portion, it is possible to maximize the force of the adhesive material to tighten the tension material. It can be remarkably raised to firmly and firmly fix the polymer tension material.

Further, since there is no fear of damaging the fixing portion of the polymeric tension material, there is no concern of causing a decrease in fixing power, and a constant tension can be maintained almost semipermanently.

Furthermore, since the structure is extremely simple, it can be made a compact structure, and since the fixing tube is made of concrete,
It will not rust.

[Brief description of drawings]

FIGS. 1, 2 and 3 show a fixing portion of a polymeric tension material. FIG. 1 is a longitudinal sectional view thereof, and FIGS. 2 and 3 are aa in FIG. It is a line and bb sectional drawing. 1 ... Fixing tube, 2 ... reinforcing bar, 3 ... hollow part, 4 ... smooth surface, 5 ... polymer tension material, 6 ... through hole, 7,8 ... adhesive material.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Jun Mizutani 4 13-Arakicho, Shinjuku-ku, Tokyo Within Sumitomo Construction Co., Ltd. (72) Inventor Ryuichi Kakihara 1-732-108 Nakahozumi, Ibaraki-shi, Osaka (56) References Japanese Patent Publication No. 39-20109 (JP, B1)

Claims (2)

[Claims] 1. An inner hollow portion of a fixing tube is formed in a conical shape such that its diameter gradually becomes smaller in the load end direction of the polymeric tension material, and the end portion of the polymeric tension material is formed in the inner hollow portion of the fixing tube. A filler having a large Poisson's ratio is inserted on the load end side around the load end and a filler having a low Poisson's ratio is filled on the free end side, and the boundary between the filler and the fixing tube is filled. A fixing portion structure of a polymeric tension material, characterized in that the surface is cut off so that friction does not occur. 2. The height according to claim 1, wherein the end portion of the polymeric tension material is bent and inserted substantially parallel to the inner hollow portion of the fixing tube along the inner surface of the hollow portion. An anchoring structure for molecular tension materials.