JP2002213048A - Composite strand, composite cable, and its using method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a composite strand, which solves a fixing difficulty as a single defect of a continuous fiber reinforcing material, is easy to convey, handle, and install without requiring a special large-diameter sheath, and abounds in weather resistance and corrosion resistance at a low cost. SOLUTION: Strands 11 and 21 of a weather-resistant steel stranded wire for prestressed concrete 10 and the continuous fiber reinforcing material 20 are abutted together at different positions in the longitudinal direction and combined into a stranded wire-like continuous wire to form a connection section 30. A reinforcing fiber sheet coated with a resin is spirally and tightly wound on the outer periphery of the connection section 30, and the sheet surface is heated and cured with the resin to form this composite strand 1.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tendon used for introducing tension in prestressed concrete and a method of using the same. The present invention relates to a composite strand, a composite cable, and a method for using the same.

[0002]

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

[0003] Examples of the weather-resistant PC tendon include a weather-resistant PC steel strand, an epoxy resin-coated PC steel, an aluminum or galvanized PC steel, and a stainless steel PC steel. Another tension member having weather resistance is a continuous fiber reinforcement. The term "continuous fiber reinforcement" is a term of the Japan Society of Civil Engineers, and refers to a fiber reinforcement 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, and low magnetism, and have more stable mechanical and physical properties than conventional PC steels, and strain. It is recognized as a strength member. However, the only weak point in terms of strength is that it is susceptible to shearing. Shear strength is higher than that of general steel. Low as 1/4 to 1/5. Special attention must be paid to handling.

[0004] When tensioning and fixing a general PC steel strand,
Using a "wedge" with a tooth profile formed on the inner surface, a PC steel stranded wire is directly grasped, and tensioning and fixing are performed at any position.
On the other hand, since the continuous fiber reinforcing material has low shear strength as described above, it is not possible to apply an excessive shear force such as directly gripping and fixing a new material with a “wedge”. As a countermeasure, insert a new material into a hollow cylindrical outer cylindrical tube made of steel with a thread cut on the outer periphery, add a filler such as resin, and bond the new tube with the new material by adhesion and adhesion effects. And tension fixing is performed by a combination of a stainless steel outer tube pipe screw and a stainless steel nut. According to such a technology, since the integration of the new material and the steel outer tube is performed at the factory, it is necessary to adjust the elongation of the wire itself due to tension and the actual length of the wire, The exact processing length is set in advance, and the fixing unit is manufactured by hand at the factory.

[0005]

The above techniques have the following problems. 1. Since the length of the steel outer tube varies in accordance with the total length of the wire, the length changes, and therefore, there is a limit to the length of the wire to be applied. 2. There is a limit in the diameter of the steel outer tube, so there is a limit in increasing 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 tubes are expensive to transport and handle. 5. A large diameter sheath through which the cable with the steel outer tube attached can pass must be embedded in the structure. For this reason, the cost of the material of the sheath and the installation is extra. 6. For installation of cables with heavy steel outer tube,
You need to use special equipment. In addition, the installation work of the tension jack becomes complicated due to the steel outer tube. Due to these, handling work time and cost are extra. 7. The anticorrosion cover that protects the steel outer tube that protrudes after tensioning becomes thicker and longer, resulting in additional costs. 8. The cost of manufacturing and processing steel outer tube is high.

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

[0007]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and the present invention has been devised to achieve the advantages of a PC steel material and a resin-reinforced fiber tension material, and to skillfully combine them so as to negate the disadvantages. With the aim of effectively utilizing these technologies to greatly expand the applicable range, composite strands, composite cables consisting of weather-resistant hybrid strands composed of weather-resistant PC steel strands and continuous fiber reinforcement, and Provides its use.

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

In this case, instead of winding the sheet, a weather-resistant tube, which is loosely fitted with a small gap around the outer periphery of the connecting portion, is externally fitted, and the inside thereof is filled with a resin under pressure, and the weather-resistant PC steel stranded wire is formed. You may connect and connect with a continuous fiber reinforcement. When the weather-resistant PC steel strand and the continuous fiber reinforcing material are made of 7 strands or 19 strands, 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 strand and the continuous fiber reinforcing material are each untwisted by the length of the connecting portion, and the unraveled strands are respectively passed through the holes of the spacer. The spacer is positioned at the beginning and end of the connecting part, and the weather-resistant PC steel strand and the untwisted strands of the continuous fiber reinforcing material are arranged in parallel in the longitudinal direction so as to overlap each other, and the weather-resistant PC steel strand is And forming a connecting portion of the continuous fiber reinforcing material, covering the outer periphery of the spacer and the connecting portion with a weather-resistant tube externally fitted to the spacer, filling the inside of the tube with a resin, reinforcing the weather-resistant PC steel strand and the continuous fiber. It is a composite strand characterized by connecting materials.
This composite strand has a larger outer diameter of the connecting portion than the composite strand formed by abutting the strands, but has the advantage of being easy to manufacture and having high reliability.

Next, in a third aspect of the present invention, there is provided a method according to a third aspect of the present invention, wherein any of the three to twenty composite strands described above is parallelized by penetrating through holes of two spacers located at the beginning and end of a connecting portion of the composite strand. A composite cable is provided, comprising a plurality of composite strands which are arranged and covered with a weather-resistant tube having an inner diameter fitted to the spacer and having an inner diameter, and filled with resin inside the cover. . This composite cable is effective when a large number of composite strands are used as tendons.

Further, the present invention provides a use of a composite strand or a composite cable, wherein any one of the above-mentioned composite strands or composite cables is used as a tension member, and a tension fixing device is disposed at a portion of the PC steel to tension the composite strand. Provide a way. As a result, the composite strand or composite cable of the present invention can be easily fixed as compared with the continuous fiber reinforcement. The present invention also provides a method of using the composite strand or the composite cable, wherein the composite strand or the composite cable is connected to each other at a PC steel part by using the composite strand 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 reinforcement is used.

[0013]

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, and shows a state before coating. The respective strands 11 and 21 of the weather-resistant PC steel strand 10 and the continuous fiber reinforcing material 20 are respectively butted at different positions 12 in the longitudinal direction and assembled into a stranded continuous wire to form the connecting portion 30. It is. FIG.
Is wound tightly around the outer periphery of the connecting portion 30 in a spiral manner with a reinforcing fiber sheet 31 coated with a resin.
The surface of No. 1 is heat-cured with a resin, and the weather-resistant PC steel strand 10
1 shows a composite strand 1 in which a composite strand 1 is connected to a continuous fiber reinforcement 20.

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

FIG. 4 is a side view showing another embodiment. The stranded wire 10 and the continuous fiber reinforcing material 20 are each untwisted by the length of the connecting portion 30, and the untwisted wires 11 and 21 are passed through the holes of two spacers 41 respectively. The spacer 41 was positioned at the beginning and end of the connecting part 30, and the weather-resistant PC steel strand 10 and the untwisted strands 11 and 21 of the continuous fiber reinforcement 20 were overlapped and arranged in parallel to form a connecting part. The state is shown. Thereafter, 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 resin. The composite strand 1 is formed by connecting the wire 10 and the continuous fiber reinforcement 20.

FIG. 5 is an explanatory view of the composite cable 2 of the present invention. The composite cable 2 has a plurality of composite strands 1 arranged in parallel to form tendons. Three to twenty composite strands 1 are arranged in parallel with the spacer 41 penetrating therethrough. 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 are provided at the beginning and end of the connection portion 30 between the weather-resistant PC steel strand 10 and the continuous fiber reinforcement 20 of the multiple composite strands.
Position. The connecting portion 30 is covered with a weather-resistant tube 32 fitted to the two spacers 41, and the inside is filled with resin. In this way, a composite cable including 3 to 20 composite strands is manufactured.

FIG. 7 shows a composite strand 1 or a composite cable 2 of the present invention, in which a weather-resistant PC steel strand 10 and a continuous fiber reinforcing material 20 are connected at a connecting portion 30 as a tension member, and a weather-resistant PC steel strand 10 is used. 2 shows a method of using a composite strand or a composite cable in which a tension fixing device 51 is disposed in a section and is used under tension. FIG. 8 shows the use of the composite strands 1a and 1b or the composite cables 2a and 2b of the present invention in which the weather-resistant PC steel wire 10 and the continuous fiber reinforcing material 20 are connected by the connecting portion 30, respectively, as tension members. The use state in which the part of the PC steel strand 10 is connected by the coupler 52 is shown. Since continuous fiber reinforcement has low shearing force,
The structure of the fixing section and the connecting section is complicated and large. Therefore, transportation handling, installation work, and the like become large-scale, and a large-diameter sheath needs to be used, so that handling is troublesome and expensive. On the other hand, since the composite strand or the composite cable of the present invention is configured as described above,
As shown in FIG. 7 and FIG. 8, the anchoring or coupler connection is performed at the portion of the weather-resistant PC steel strand, which is rich in corrosion resistance and weather resistance.
A simple structure is sufficient.

[0018]

According to the present invention, the only disadvantage that the shear strength of the continuous fiber reinforcing material is small has been solved, and a composite strand or a composite cable having excellent weather resistance and corrosion resistance can be obtained. This composite strand or composite cable is a PC
Since it is fixed or connected at the steel part, it does not require a large fixing structure or connecting structure as in the case of the continuous fiber reinforcement alone, so there is no need to use a special large diameter sheath,
In addition, transportation handling and installation work are easy and inexpensive.

[Brief description of the 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 is a side view of the spacer, and FIG. 6B is a front view of the spacer.

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

FIG. 8 is an explanatory diagram showing how to use the embodiment.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 composite strand 2 composite cable 10 weather-resistant PC steel strand 11 strand 12 position 20 continuous fiber reinforcement 21 strand 30 connecting portion 31 reinforcing fiber sheet 32 weather-resistant tube 41 spacer 42 through-hole 51 tension fixing device 52 coupler

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2E164 AA02 AA05 AA11 BA06 BA25 DA01 DA27 3B153 AA06 AA07 AA41 AA45 BB01 CC12 CC52 DD23 DD26 EE18 EE22 EE27 FF02 GG08 GG40 4E070 BG03 4G058 GB02 GB05 GF24 GF22

Claims (7)

[Claims] 1. A weather-resistant PC steel stranded wire and a continuous fiber reinforcing material which are butt-joined at different positions in the longitudinal direction to form a stranded continuous wire. Forming a connection portion, around the connection portion outer periphery, tightly wrapping a reinforcing fiber sheet coated with a resin spirally, heating and cooling the resin on the sheet surface to be cured,
A composite strand comprising a weather-resistant PC steel strand and a continuous fiber reinforcement connected to each other. 2. Instead of winding the sheet, a weather-resistant tube is loosely fitted around the outer periphery of the connecting portion with a small gap, and resin is pressure-filled in the tube to form a weather-resistant PC.
The composite strand according to claim 1, wherein the strand is connected to a continuous fiber reinforcement. 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 strand of a weather-resistant PC steel strand and a continuous fiber reinforcing material are each untwisted by the length of the connecting portion, and the unraveled wires are respectively passed through 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 steel strand and the continuous fiber reinforcement are overlapped with each other in the longitudinal direction and arranged in parallel to form a connection part of the weather-resistant PC steel strand and the continuous fiber reinforcement, The outer periphery of the spacer and the connecting portion is covered with a weather-resistant tube externally fitted to the spacer, the resin is filled in the tube, and the weather-resistant PC steel strand is connected to the continuous fiber reinforcing material. Composite strand. 5. The composite strand according to claim 1, wherein 3 to 20 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 of a 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 fitted to the spacer, and filling the inside of the cover with a resin. 6. Using a composite strand according to any one of claims 1 to 4 or a composite cable according to claim 5 as a tension member, and tensioning by disposing a tension fixing device at a portion of a PC steel material. How to use composite strands or composite cables. 7. A PC using the composite strand according to any one of claims 1 to 4 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 at a steel material portion.