JP3466155B2 - Composite strand, composite cable and method of using the same - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tension material used for introducing a tension force of prestressed concrete and a method of using the tension material. More specifically, it is formed by joining a weather resistant PC steel stranded wire and a continuous fiber reinforcing material. The present invention relates to a composite strand, a composite cable and a method of using the same.

[0002]

2. Description of the Related Art PC steel is generally used as a tension material for introducing prestress into prestressed concrete. Since PC steel is made of steel, in general, it has sufficient corrosion resistance against operating conditions such as corrosive atmosphere,
In some cases, weather resistance cannot be expected.

Examples of the PC tension material having weather resistance include a stranded PC steel wire having weather resistance, an epoxy resin-coated PC steel material, an aluminum or galvanized PC steel material, and a stainless PC steel material. Further, as another tension material having weather resistance, there is a continuous fiber reinforcing material. The continuous fiber reinforcing material is a term used by the Japan Society of Civil Engineers and refers to a fiber reinforcing material made of a resin reinforced with carbon fiber, aramid fiber, glass fiber or the like. These are used as new materials. These new materials have advantages such as light weight, high corrosion resistance, high strength, low magnetism, etc., and also have more stable mechanical and physical properties than conventional PC steel materials, so that tension is exerted. It is recognized as a strength member. However, the only weak point in terms of strength is that it is weak against shearing. The shear strength is higher than that of general steel. It is as low as 1/4 to 1/5, so. Special care needs to be taken in handling.

When tensioning and fixing a general PC steel strand,
Using a "wedge" with a tooth profile on the inner surface, the PC stranded wire is directly gripped, and tension and fixing are performed at arbitrary positions.
On the other hand, since the continuous fiber reinforcing material has a small shear strength as described above, it is impossible to apply an excessive shearing force such as directly grasping and fixing a new material with a “wedge”. As a countermeasure, insert a new material into a steel hollow cylindrical outer cylinder tube with a thread cut on the outer periphery, put a filling material such as resin, and use an adhesive and adhesion effect to create an outer cylinder tube and a new material. Are integrated and the tension is fixed by the combination of the screw of the stainless steel outer tube and the nut of the stainless steel. According to such a technique, since the integrated processing of the new material and the steel outer cylinder tube is performed in the factory, it is necessary to adjust the elongation of the wire itself due to the tension and the actual length of the wire, The fixing length is set in advance and the fixing part is hand-made at the factory.

[0005]

The above techniques have the following problems. 1. Since the length of the steel outer cylinder tube varies depending on the total length of the wire rod, the length changes, and thus the length of the wire rod to be applied is limited. 2. Since there is a limit to the diameter of the steel outer tube, there is a limit to the increase in the yield strength of the new material. 3. The length of the cable with the steel outer tube attached cannot be adjusted on site because it is manufactured at the factory. 4. Cables with steel outer tube are expensive to carry and handle. 5. A large-diameter sheath that allows a cable with a steel outer tube attached to pass through must be embedded in the structure. Therefore, the material for the sheath and the cost for installation are extra. 6. For installing cables with heavy steel outer tube attached,
You need to use special equipment. Further, the steel outer cylinder tube complicates the installation work of the tension jack. Due to these factors, handling work time and its cost are extra. 7. The rust-proof cover that protects the steel outer tube that protrudes after tension becomes thick and long, and costs extra. 8. The cost of manufacturing and processing the steel outer tube is high.

An object of the present invention is to provide a composite strand, a composite cable and a method of using the same, which solve the above problems.

[0007]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and combines the PC steel material and the resin-reinforced fiber tension material so as to exert their respective advantages, and to skillfully combine them so as to cancel the drawbacks. The composite strand, the composite cable, and the composite cable, which are made of weather resistant PC steel stranded wire and weather resistant hybrid stranded wire composed of continuous fiber reinforcement, are used for the purpose of effectively utilizing these technologies and greatly expanding the scope of application. Provide its usage.

That is, according to the present invention, the weather-resistant PC stranded wire and the continuous fiber reinforcing material are butt-joined at different positions in the longitudinal direction to assemble them into a stranded continuous wire, and the weather-resistant PC stranded wire and continuous wire are formed. A connecting portion of the fiber reinforcing material is formed, a reinforcing fiber sheet coated with a resin is tightly wound around the connecting portion in a spiral shape, and the resin on the surface of the sheet is heated and cooled to be hardened. And a continuous fiber reinforcing material, which is a composite strand.

In this case, instead of winding the sheet, a weatherproof tube which is loosely fitted around the outer periphery of the connecting portion with a minute gap is externally fitted, and the inside of the tube is pressure-filled with a weatherproof PC steel stranded wire. You may connect and comprise a continuous fiber reinforcement material. In addition, when the weather resistant PC steel stranded wire and the continuous fiber reinforcing material are 7 stranded wires or 19 stranded wires, this composite strand can be effectively realized.

In the composite strand according to the second aspect of the present invention, the weather resistant PC steel stranded wire and the continuous fiber reinforcing material are each untwisted by the length of the connecting portion, and the unwound strands are respectively passed through the holes of the spacer. Spacers are located at the beginning and end of the connecting part, and the untwisted strands of the weatherproof PC steel strands and continuous fiber reinforcement are placed in parallel with each other in the longitudinal direction so that the weatherproof PC steel strands And a continuous portion of continuous fiber reinforcing material is formed, the spacer and the outer periphery of the connecting portion are covered with a weatherproof tube which is fitted onto the spacer, and the inside of the tube is filled with resin, and a weatherproof PC steel strand and continuous fiber reinforcement are formed. A composite strand characterized in that it is formed by connecting materials.
The composite strand has an outer diameter of the connecting portion larger than that of the composite strand formed by abutting the strands, but has an advantage that it is easy to manufacture and has high reliability.

Next, in a third aspect of the present invention, 3 to 20 of any of the above-described composite strands are parallel to each other by penetrating through holes of two spacers located at the beginning and end of the connecting portion of the composite strand. Disclosed is a composite cable characterized by comprising a plurality of composite strands formed by covering a spacer and a connecting portion with a weatherproof tube having an inner diameter that fits over the spacer, and filling the interior of the cover with a resin. . This composite cable is effective when a large number of composite strands are used as a tendon.

Furthermore, the present invention uses any one of the above-mentioned composite strands or composite cables as a tension material, and arranges a tension fixing device in the portion of the PC steel material for tensioning. Provide a way. This allows the composite strands or cables of the present invention to be more easily fixed than continuous fiber reinforcements. Further, there is provided a method of using a composite strand or a composite cable, wherein the composite strands or the composite cables are connected to each other at a PC steel material portion by using these composite strands or the composite cable.
As a result, the composite strand or composite cable of the present invention facilitates the connection of the strand or cable as compared with the case where only the continuous fiber reinforcing material is used.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a side view showing a structure of a composite strand showing an embodiment of the present invention, showing a state before coating. The strands 11 and 21 of the weatherproof PC steel stranded wire 10 and the continuous fiber reinforcing material 20 are butted against each other at different positions 12 in the longitudinal direction and assembled into a stranded continuous wire material to form a connecting portion 30. There is. Figure 2
A reinforcing fiber sheet 31 coated with a resin is tightly wound spirally around the outer periphery of the connecting portion 30.
The surface of 1 is heated and hardened with resin, and the weather resistance PC steel stranded wire 10
1 shows a composite strand 1 in which the continuous fiber reinforcement 20 and the

FIG. 3 shows a composite strand 1 in which, instead of winding the reinforcing fiber sheet 31 shown in FIG. 2, a weather resistant tube 32 which is loosely fitted to the outer diameter of the stranded wire with a minute gap is externally fitted to the connecting portion 30. This composite strand 1 is a weatherproof tube 3
2 is pressure-filled with resin and weatherproof PC steel stranded wire 10
It is a composite strand 1 in which the continuous fiber reinforcement 20 and the

FIG. 4 is a side view showing another embodiment. The weather resistant PC stranded wire 10 and the continuous fiber reinforcing material 20 are each untwisted for the length of the connecting portion 30, and the untwisted wires 11 and 21 are passed through the holes of the two spacers 41, respectively. The spacer 41 is located at the beginning and end of the connecting portion 30, and the untwisted strands 11 and 21 of the weatherproof PC steel stranded wire 10 and the continuous fiber reinforcing material 20 are arranged in parallel with each other to form a connecting portion. It shows the state. After that, a weather resistant tube 32 similar to that shown in FIG. 3 is externally fitted to the spacer and the connecting portion to cover the outer periphery of the spacer 41 and the connecting portion, and the inside of the tube 32 is filled with a resin. The wire 10 and the continuous fiber reinforcement 20 are connected to form the composite strand 1.

FIG. 5 is an explanatory view of the composite cable 2 of the present invention. The composite cable 2 is formed by arranging a large number of the above-mentioned composite strands 1 in parallel to form a tendon. The spacer 41 is penetrated and 3 to 20 composite strands 1 are arrange | positioned in parallel. The spacer 41 is a disk having a large number of through holes 42 as shown in FIG. FIG. 6A is a side view of the spacer 41, and FIG. 6B is a front view thereof.
Spacers 41 at the beginning and end of the connecting portion 30 between the weatherproof PC steel strand 10 and the continuous fiber reinforcing material 20 of many composite strands.
Position. The connecting portion 30 is covered with a weatherproof tube 32 fitted onto the two spacers 41, and the inside thereof is filled with resin. In this way, a composite cable composed of 3 to 20 composite strands is manufactured.

FIG. 7 shows the weather resistant PC steel stranded wire 10 using the composite strand 1 or the composite cable 2 of the present invention in which the weather resistant PC steel stranded wire 10 and the continuous fiber reinforcing material 20 are connected by the connecting portion 30. The method of using the composite strand or the composite cable, in which the tension fixing device 51 is arranged in the portion of FIG. FIG. 8 shows that each of the composite strands 1a and 1b of the present invention or the composite cables 2a and 2b of the present invention in which the weather resistant PC steel strand 10 and the continuous fiber reinforcing material 20 are connected by the connecting portion 30 is used as a tension member, and the weather resistance of both of them is used. It shows a use state in which the portion of the PC stranded wire 10 is connected by the coupler 52. Since the shearing force is small with continuous fiber reinforcement,
The structure of the fixing unit and the connecting unit is complicated and large. Therefore, it requires a large amount of transportation and installation work, and also requires the use of a large-diameter sheath, which makes the handling cumbersome and expensive. On the other hand, since the composite strand or composite cable of the present invention is configured as described above,
In addition to being excellent in corrosion resistance and weather resistance, fixing or coupler connection is performed at the portion of the weather resistant PC steel stranded wire as shown in FIG. 7 and FIG.
A simple structure is enough.

[0018]

EFFECTS OF THE INVENTION According to the present invention, the only drawback of the continuous fiber reinforcement having a small shearing force can be solved, and a composite strand or a composite cable excellent in weather resistance and corrosion resistance can be obtained. This composite strand or cable is a PC
Since it is fixed or connected at the steel part, there is no need to use a large fixing structure or connecting structure as in the case of the continuous fiber reinforcing material alone, so there is no need to use an exceptionally large diameter sheath,
In addition, it is easy to carry and install, and is inexpensive.

[Brief description of drawings]

FIG. 1 is a side view of an embodiment.

FIG. 2 is a side view of the embodiment.

FIG. 3 is a side view of the embodiment.

FIG. 4 is a side view of the embodiment.

FIG. 5 is a side view of the embodiment.

6A and 6B are a side view and a front view of a spacer.

FIG. 7 is an explanatory diagram showing a method of using the embodiment.

FIG. 8 is an explanatory diagram showing a method of using the embodiment.

[Explanation of symbols]

1 composite strand 2 composite cable 10 Weatherproof PC steel stranded wire 11 strands 12 position 20 Continuous fiber reinforcement 21 strands 30 connection 31 Reinforcing fiber sheet 32 Weatherproof tube 41 Spacer 42 through hole 51 Tension fixing device 52 Coupler

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Claims (7)

(57) [Claims] 1. A weather-resistant PC stranded wire and a continuous fiber reinforcing material are assembled into a stranded continuous wire material by associating each strand of the weather-resistant PC stranded wire and continuous fiber reinforcing material at different positions in the longitudinal direction. Forming a connection portion of, and around the connection portion, a reinforcing fiber sheet coated with a resin is tightly wound in a spiral shape, and the resin on the surface of the sheet is heated and cooled to be cured,
A composite strand comprising a weather resistant PC stranded wire and a continuous fiber reinforcing material connected to each other. 2. Instead of winding the sheet, a weather resistant tube which is loosely fitted around the outer periphery of the connecting portion with a minute gap is externally fitted, and a resin is pressure-filled in the tube to form a weather resistant PC.
The composite strand according to claim 1, wherein the stranded steel wire and the continuous fiber reinforcing material are connected to each other. 3. The composite strand according to claim 1, wherein the weather resistant PC steel stranded wire and the continuous fiber reinforcing material are 7 stranded wires or 19 stranded wires, respectively. 4. A weather-resistant PC stranded wire and a continuous fiber reinforcing material are each untwisted for the length of the connecting portion, and the unwound strands are respectively passed through the holes of the spacer to position the spacer at the beginning and end of the connecting portion. The untwisted strands of the weather-resistant PC stranded wire and the continuous fiber reinforcement are arranged in parallel in the longitudinal direction so as to form a connection portion between the weather-resistant PC stranded wire and the continuous fiber reinforcement, It is characterized in that the spacer and the outer periphery of the connecting portion are covered with a weatherproof tube fitted onto the spacer, the inside of the tube is filled with resin, and the weatherproof PC steel strand and the continuous fiber reinforcing material are connected. Composite strand. 5. Three to twenty composite strands according to any one of claims 1 to 4 are arranged in parallel by penetrating through holes of two spacers located at the beginning and end positions of the connecting portion of the composite strand, A composite cable formed by covering a spacer and a connecting portion with a weatherproof tube having an inner diameter to be fitted onto the spacer, and filling the inside of the cover with a resin. 6. Using the composite strand according to any one of claims 1 to 4 or the composite cable according to claim 5 as a tension member, a tension fixing device is provided in a portion of a PC steel material for tensioning. A method of using the characteristic composite strand or composite cable. 7. A PC using the composite strand according to claim 1 or the composite cable according to claim 5.
A method of using a composite strand or a composite cable, wherein the composite strands or the composite cables are connected to each other in a steel material portion.