JP6393444B2 - Synthetic fiber cable - Google Patents

Description

  The present invention relates to a synthetic fiber cable.

  Patent document 1 describes what inserts the rod-shaped body made from carbon fiber or an aramid fiber in a concrete structure, and aims at an intensity | strength improvement.

JP 2000-110365 A

  A long hole is drilled in the reinforced concrete column, and a carbon fiber rod is driven into the long hole. Thereafter, the remaining voids in the long holes are filled with a fluid curable resin, so that the carbon fiber rod is fixed in the concrete. Carbon fiber rods are only fixed in concrete by a fluid curable resin in contact with the surface.

  An object of the present invention is to provide a synthetic fiber cable capable of increasing the contact efficiency with concrete or the like by allowing concrete or the like to enter the inside of the cable, thereby increasing the fixing efficiency.

  Another object of the present invention is to provide a synthetic fiber cable excellent in handling that generates an appropriate amount of bending when bending is applied.

  The synthetic fiber cable according to the present invention has a plurality of synthetic fibers impregnated with a resin, each of which includes a core wire bundled into a bundle, and a plurality of synthetic fibers impregnated with a resin, A plurality of side lines each of which is bundled together, and the resin is in a cured state, and each of the plurality of side lines is molded using the curing property of the resin, Each of the plurality of side wires is in a state of being twisted around the core wire.

  The core wire and the side wire constituted by a plurality of synthetic fibers impregnated with the resin maintain the shape when the resin is cured by curing the resin. If the resin is a thermosetting resin, the resin is cured by applying heat, and if the resin is a thermoplastic resin, the resin is cured. When the resin is cured in a state where a predetermined shape is applied, the core wire and the side wire can continue to maintain the shape after that.

  Synthetic fibers (fibers made from chemically synthesized polymers, not natural fibers such as cotton and silk) that constitute the core and side wires are carbon fibers, glass fibers, boron fibers, aramid fibers, polyethylene fibers, Includes PBO (polyp-phenylenebenzobisoxazole) fiber and other fibers. These fibers are very thin and can be impregnated with resin by bundling a large number of synthetic fibers.

  The synthetic fiber cable is formed by making each of the plurality of side wires molded in advance by using the curability of the resin to be twisted around the core wire. According to the present invention, the side wires are molded in advance by using the curing property of the resin, and specifically, the inside of the synthetic fiber cable, specifically, between the core wire and the surrounding side wires, and between adjacent side wires. In addition, an appropriate space or gap can be secured without impairing the substantially twisted state.

  Since the core wire constituting the synthetic fiber cable and the surrounding side wires are in a state in which the resin is cured in each, the core wire, the surrounding side wires, and adjacent side wires slip (displacement). Is acceptable. This provides a synthetic fiber cable that is easy to moderately bend when bent and is excellent in handling. For example, a long synthetic fiber cable can be wound around a small-diameter reel to make it compact and easy to handle at the work site. The synthetic fiber cable according to the present invention is suitable for use as, for example, an electric wire (power transmission line), an optical fiber cable, a submarine cable, or other relatively long members or a reinforcing material for equipment.

  In one embodiment, for each of the core wire and the plurality of side wires, both a contact portion where the side wire is in contact with the core wire and a non-contact portion where the side wire is not in contact with the core wire. In the longitudinal direction (exists in the longitudinal direction). That is, the plurality of side lines around the core wire do not continue to contact the core wire over the entire length in the longitudinal direction, and have a portion that is not in contact (the side line is floating from the core wire). The contact portion prevents the synthetic fiber cable from being deformed. Since the non-contact part is a space between the core wire and the side wire, it contributes to improving the cable bendability and also helps to penetrate concrete, mortar and other coagulants or coagulants. For example, when a synthetic fiber cable is embedded in concrete, the concrete penetrates into the synthetic fiber cable, and the synthetic fiber cable is firmly fixed in the concrete. The synthetic fiber cable according to the present invention is also suitable for use as a reinforcing material for concrete structures, for example.

  In another embodiment, each of the plurality of side lines has both a contact part in contact with the adjacent side line and a non-contact part not in contact with the adjacent side line in the longitudinal direction. That is, the plurality of side lines around the core wire do not continue to contact adjacent side lines over the entire length in the longitudinal direction, and have a non-contact portion (there is a gap between the side lines). The contact portion prevents the synthetic fiber cable from being deformed. The non-contact part contributes to the cable bendability and is useful for the penetration of concrete, mortar and other coagulants or coagulants into the interior of the synthetic fiber cable.

  Preferably, the contact part and the non-contact part are repeated in the longitudinal direction for both the contact part and the non-contact part between the core wire and the side line, and the contact part and the non-contact part between adjacent side lines. Exists. A cable that is easy to bend over its entire length is provided. When this synthetic fiber cable is used for a concrete structure, it is possible to secure the inner space allowing the penetration of the concrete in the longitudinal direction of the synthetic fiber cable and to allow the penetration of the concrete from the outside to the inside. The entrances to be distributed can be secured.

It is a front view of a carbon fiber cable. It is a disassembled perspective view of a carbon fiber cable. It is an expanded sectional view which follows the III-III line of FIG. It is an expanded sectional view which follows the IV-IV line of FIG. It is an expanded sectional view which follows the VV line of FIG. It is a graph which shows the result of a concrete drawing test.

  FIG. 1 shows the appearance of a carbon fiber cable. FIG. 2 is an exploded perspective view of the carbon fiber cable. 3 to 5 show enlarged sectional views of the carbon fiber cable taken along lines III-III, IV-IV, and VV in FIG. 1, respectively.

  The carbon fiber cable 1 is composed of one core wire 2 and six side wires 3 (3a to 3f) twisted around the core wire (1 × 7 structure). As seen from the cross section, the carbon fiber cable 1, the core wire 2 and the side wire 3 all have a substantially circular shape. Further, as viewed from the cross section, the carbon fiber cable 1 has a core wire 2 disposed at the center thereof, and six side wires 3 are positioned so as to surround the core wire 2. The carbon fiber cable 1 has a diameter of about 5 mm to 20 mm, for example.

  Each of the core wire 2 and the side wire 3 is formed by bundling a large number of, for example, tens of thousands of long carbon fibers 4 impregnated with a thermosetting resin (for example, epoxy resin) 5 into a circular cross section. As a whole, about several hundred thousand carbon fibers 4 are included. Each of the carbon fibers 4 is very thin, for example, has a diameter of 5 μm to 7 μm. The core wire 2 and the side wire 3 may be formed by bundling a plurality of carbon fibers 4 impregnated with the thermosetting resin 5 and twisting a plurality of bundles of the carbon fibers. It can also be said that the core wire 2 and the side wire 3 are made of carbon fiber composite material (CFRP) (Carbon Fiber Reinforced plastics).

  The core wire 2 and the side wire 3 have the same thickness (cross-sectional area) in this embodiment. However, a side line 3 that is thinner or thicker than the core 2 may be used. Depending on the number of the carbon fibers 4, the thicknesses of the core wire 2 and the side wire 3 can be arbitrarily adjusted.

  The core wire 2 and the side wires 3 constituting the carbon fiber cable 1 are both in a state in which heat is applied to the thermosetting resin 5 and cured in advance. That is, the side line 3 in a state of being cured using the thermosetting property of the thermosetting resin 5 is disposed around the core wire 2 in a state of being cured using the thermosetting property of the thermosetting resin 5. The carbon fiber cable 1 is made by being twisted. Since the thermosetting resin 5 of each of the core wire 2 and the side wire 3 is cured, an appropriate slip is allowed between the core wire 2 and the surrounding side wires 3 and 3.

  Referring to FIG. 2, all six side wires 3 that are twisted around the core wire 2 are preliminarily formed in a spiral shape, and the other core wire 2 does not have a spiral shape. Needless to say, the spiral shape of the side wires 3 is formed before thermosetting the thermosetting resin 5. The pitch of the spiral molding of each side wire 3 is substantially the same, and the inner diameter of the spiral of each side wire 3 is substantially equal to the diameter of the core wire 2.

  Here, each of the side lines 3 has a portion (hereinafter referred to as a bulging portion) that is partly shaped so as to bulge slightly outward. In the carbon fiber cable 1 shown in FIG. 1, four bulging portions 3A to 3D are shown with some emphasis.

  Referring to FIG. 3, when the portion having the bulging portion 3 </ b> A is viewed in cross section, one of the six side lines 3 a to 3 f around the core wire 2 (side wire 3 a) is not in contact with the core wire 2. , Is displaced outwardly away from the core wire 2. The side line 3a is pre-typed so that this displacement occurs. By separating the side wire 3a from the core wire 2, an internal space (non-contact portion) 11 is secured between the core wire 2 and the side wire 3a.

  Since both the core wire 2 and the side wire 3 are circular in cross section, the portions that do not necessarily contact between the core wire 2 and the side wire 3 (for example, the core wire 2, the side wire 3c, and the side line 3d in FIG. 3). The internal space 11 referred to in this specification does not mean the cross-sectional triangular space 20, and is defined with respect to the side line 3. This means a space between the core wire 2 and the side wire 3 secured by pre-molding. By securing the internal space 11, the space 20 having two generally triangular cross sections is connected.

  In FIG. 3, the side line 3a is in contact with one side line 3f of the two side lines 3b and 3f located on both sides thereof, but is not in contact with the other side line 3b and is away from the side line 3b. (The side line 3a is pre-typed so that this position shift occurs). Since the side line 3a is separated from the side line 3b, a gap 12 is secured between the side line 3a and the side line 3b.

  Referring to FIG. 4, when a portion having another bulge portion 3 </ b> B is viewed in cross section, two of the six side lines 3 a to 3 f around the core wire 2 (side wires 3 e and 3 f) are connected to the core wire 2. There is no contact, and an internal space 11 is secured between the core wire 2 and the side wires 3e and 3f. Since the side lines 3e and 3f are adjacent to each other, the two internal spaces 11 are continuous, and as a result, a wide internal space is formed. The other side line 3c is in contact with the core wire 2, but is located away from both of the two side lines 3b and 3d located on both sides of the side line 3c, and a gap is formed between each side of the side line 3c. 12 is secured.

  In FIG. 4, the internal space 11 is shown as a closed space, but the internal space 11 is not a space that is completely blocked from the outside, but an open space that leads to the outside. That is, the internal space 11 secured between the core wire 2 and the side wire 3 is secured by separating the two adjacent side wires 3 at different locations in the longitudinal direction of the carbon fiber cable 1 as described above. It continues to the gap 12. The internal space 11 communicates with the outside through the gap 12.

  Referring to FIG. 5, when the portion having the bulging portions 3C and 3D is viewed in cross section, four of the six side lines 3 around the core wire 2 (side lines 3b, 3c, 3e, and 3f) are the core wires. No internal contact 11 is secured. Further, gaps 12 are secured between the side lines 3a and 3b, between 3c and 3d, between 3e and 3f, and between 3f and 3a.

  As described above, the location and number of the internal space 11 and the gap 12 are different in the carbon fiber cable 1 depending on the location of the cross section. However, depending on the cross-sectional location, the internal space 11 and the gap 12 may not appear at all, and conversely, the six side wires 3 may not be in contact with the entire circumference of the core wire 2. . Further, as shown in FIGS. 3 to 5, the sizes of the internal space 11 and the gap 12 appearing in the cross section (the distance between the core wire 2 and the side line 3 and the distance between the adjacent side lines 3) are various. This means that the degree of the plurality of bulge portions 3A to 3D varies. Note that extremely large bulging portions (internal space 11 and gap 12) do not exist in carbon fiber cable 1, and the substantially twisted state is not impaired.

  The bulging portion described above is repeatedly formed in the longitudinal direction of the carbon fiber cable 1. That is, for each of the core wire 2 and the plurality of side wires 3, the side wire 3 is in contact with the core wire 2 (the portion without the internal space 11), and the side wire 3 is in contact with the core wire 2. Non-contact parts (parts with the internal space 11) that are not repeated appear repeatedly in the longitudinal direction. Similarly, a contact portion (a portion without the gap 12) and a non-contact portion (a portion with the gap 12) appear repeatedly in the longitudinal direction between the adjacent side lines 3.

  The bulging portions may be provided at predetermined intervals in the longitudinal direction of the side lines 3 or may be provided randomly. Although all the side lines 3 may be provided with bulging portions at the same interval in the longitudinal direction, the bulging portions may have different intervals in the longitudinal direction for each side line 3. The bulging portions are provided in a distributed manner in the carbon fiber cable 1, and the internal space 11 and the gaps 12 are present in the longitudinal direction of the carbon fiber cable 1.

  As described above, since the thermosetting resin 5 of each of the core wire 2 and the side wire 3 is cured, the carbon fiber cable 1 is allowed to slip between the core wire 2, the side wire 3, and the side wire 3, and further, Since the space 11 and the gap 12 are provided, moderate bending occurs when bending is applied, and the handling becomes excellent. It can be wound around a small-diameter reel to make it compact, making it easier to handle at the work site. The carbon fiber cable 1 is suitable for use as a core material of a long object such as a power transmission line.

  The carbon fiber cable 1 can also be used as a reinforcing material for concrete structures, for example. When the carbon fiber cable 1 is embedded in the concrete (fresh concrete) before setting, the concrete enters the carbon fiber cable 1 with the gap 12 between the adjacent side wires 3 as an entrance. The concrete that has entered the carbon fiber cable 1 through the gap 12 enters the internal space 11 secured between the core wire 2 and the side wire 3, and as a result, the contact area between the carbon fiber cable 1 and the concrete is increased. . However, depending on the viscosity of the fresh concrete, the size of the internal space 11, the gap 12, etc., the concrete may not completely fill the internal space 11, but the concrete is not present on the outer peripheral surface (surface) of the carbon fiber cable 1. In addition to contact, since contact with the concrete also occurs inside the carbon fiber cable 1, an increase in the contact area between the concrete and the carbon fiber cable 1 is achieved. For this reason, for example, the degree of adhesion stress can be greatly improved as compared with a reinforcing bar, and the carbon fiber cable 1 can be fixed in the concrete with high fixing efficiency. Concrete structures include bridge girders, piers, bridge railings, protective walls, etc.

FIG. 6 is a graph showing the results of a concrete drawing test in which the horizontal axis is slip displacement (mm) and the vertical axis is the degree of adhesion stress (N / mm ² ). The solid line in the graph indicates the test result of the carbon fiber cable 1 described above, and the broken line indicates the test result of the carbon fiber cable without the internal space 11 and the gap 12. The diameter, number and structure of the core and side wires that make up the cable, and the embedded length (adhesion length) in the concrete were measured under the same conditions.

  The concrete pull-out test was carried out according to the Japan Society of Civil Engineers "Test method for bond strength between continuous fiber reinforcement and concrete by pull-out test". In this test, a concrete block is created in which the middle part is embedded with both ends of the carbon fiber cable exposed. A tensile load is applied to the carbon fiber cable going out from one end of the concrete block at a predetermined loading speed using a tensile tester, and the displacement of the carbon fiber cable going out from the other end of the concrete block (Slip displacement) is measured using a displacement meter.

The degree of adhesion stress τ (N / mm ² ) is calculated using the following mathematical formula.

  Bond stress τ = P / u · L

  Here, P represents the tensile load (kN), u represents the nominal circumference (mm) of the carbon fiber cable, and L represents the adhesion length (mm) to the concrete block.

  As a result of the concrete pull-out test, the adhesion stress degree (solid line) of the carbon fiber cable 1 described above is greatly improved compared to the adhesion stress degree (solid line) of the carbon fiber cable having no internal space 11 and gap 12. It is confirmed that the fixing efficiency is high.

The degree of molding of the side wire 3 in the carbon fiber cable 1 (the degree of restraint by the side wire 3) is determined by using the diameter D of the cable 1, the diameter σ ₁ of the core wire 2 constituting the cable 1, and the diameter σ _{2 of the} side wire 3. D / (σ ₁ + 2σ ₂ ) × 100 (%) (hereinafter, referred to as a molding rate). If there is a molding rate of about 100.1 to 105 (%), the carbon fiber cable 1 will be moderately bent when bent, and the concrete fixing efficiency will be improved. However, if the concrete fixing efficiency is emphasized and the concrete fixing efficiency is further improved, a plurality of side lines 3 may be molded so as to have a larger molding rate of, for example, about 110%.

  In the embodiment described above, an example in which the carbon fiber cable 1 is constituted by the core wire 2 and the side wire 3 that are cured by impregnating a bundle of a plurality of carbon fibers 4 with the thermosetting resin 5 and applying heat thereto. Although described, a thermoplastic resin (for example, polyamide) may be used instead of the thermosetting resin 5. Further, instead of carbon fiber, other synthetic fibers such as glass fiber, boron fiber, aramid fiber, polyethylene fiber, PBO (polyp-phenylenebenzobisoxazole) fiber, etc. can be used.

DESCRIPTION OF SYMBOLS 1 Carbon fiber cable 2 Core wire 3, 3a, 3b, 3c, 3d, 3e, 3f Side wire 3A, 3B, 3C, 3D Swelling part 4 Carbon fiber 5 Thermosetting resin
11 Internal space
12 Clearance

Claims (6)

A core having a plurality of synthetic fibers impregnated with a resin, and these are bundled together;
Each having a plurality of synthetic fibers impregnated with resin, each having a plurality of side wires bundled together in bundles,
The resin is in a cured state, and each of the plurality of side lines is molded using the curability of the resin,
In the synthetic fiber cable in which each of the plurality of typed side wires is twisted around the core wire ,
Each of the plurality of side wires constituting the synthetic fiber cable has a bulge portion that is shaped so as to bulge slightly outward.
In each of the side lines, the bulging portion is repeatedly formed in the longitudinal direction.
Synthetic fiber cable. For each of the core wire and the plurality of side wires, both a contact portion where the side wire is in contact with the core wire and a non-contact portion where the side wire is not in contact with the core wire are arranged in the longitudinal direction. Have,
The synthetic fiber cable according to claim 1. Each of the plurality of side lines has both a contact portion in contact with the adjacent side line and a non-contact portion not in contact with the adjacent side line in the longitudinal direction.
The synthetic fiber cable according to claim 1 or 2. The contact part and the non-contact part are repeatedly present in the longitudinal direction.
The synthetic fiber cable according to claim 2 or 3.   A concrete structure in which the synthetic fiber cable according to any one of claims 1 to 4 is embedded in concrete.   A long article in which the synthetic fiber cable according to any one of claims 1 to 4 is used as a reinforcing material.

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