JP7116700B2 - TERMINAL FIXING STRUCTURE AND METHOD OF FIBER REINFORCED PLASTIC STRELAY BODY, AND BUFFERING MATERIAL FOR FIBER REINFORCED PLASTIC STRIA BODY - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fixing structure and method for fixing (fixing) a terminal socket (fixing tool) to the end portion of a filamentous body made of fiber-reinforced plastic. The present invention also relates to a cushioning material that cushions the force applied to the filamentary body made of fiber-reinforced plastic from its surroundings.

FRP (Fiber Reinforced Plastics), which is a composite material of fibers and plastics, has high strength, and cables (ropes, rods) made using FRP have a higher strength than steel stranded wires. It has excellent properties such as light weight, high corrosion resistance, and non-magnetism. Carbon fiber, glass fiber, Kevlar fiber, etc. are used as fiber materials for FRP, and epoxy resin, polyamide resin, phenol resin, etc. are used as plastic materials for FRP. FRP cables are used, for example, as tendons for prestressed concrete, reinforcing materials for electric wires, and the like.

An FRP cable has a high tensile strength in its longitudinal direction equivalent to that of a steel stranded wire, but is weak against local shear forces and surface scratches. For this reason, if a socket is fixed to the end of a wedge directly in the same manner as a stranded steel wire, shear failure or surface failure will occur, resulting in slippage, making it impossible to achieve high anchoring efficiency between the cable and the socket.

In Patent Document 1, the end portion of a carbon fiber reinforced plastic cable (CFRP cable) is covered with a friction sheet with abrasive particles attached to the front and back surfaces, and a braided net tube is formed by braiding metal wires from above. Disclosed is a terminal fixing structure and method for wedging the portion covered with the friction sheet and the braided net tube into a wedge and wedging it into the terminal socket. The friction sheet and the braided net tube can absorb the local shearing force by the wedge, making it difficult for the CFRP cable to undergo shear failure and surface layer failure at the location of the wedge.

International publication WO2011/019075

However, it is somewhat time consuming to install these two components in the field since it is necessary to first cover the end portion of the CFRP cable with the friction sheet and then cover the braided net tube over it. The braided net tube is made by braiding strands of metal wires into a tubular shape, and has both flexibility and high strength. A strong local force may be applied to the CFRP cable directly under the strand.

SUMMARY OF THE INVENTION An object of the present invention is to shorten the time required to attach a cushioning material to a filamentary body made of fiber-reinforced plastic.

Another object of the present invention is to make it possible to more evenly disperse the local shearing force exerted by the wedge on the fiber-reinforced plastic filamentary body.

A further object of the invention is to facilitate the reuse of the wedge.

Fiber-reinforced plastic filaments are formed into filaments by combining (mixing) fiber materials such as carbon fiber, glass fiber, and Kevlar fiber with resin materials such as epoxy resin, polyamide resin, and phenol resin. It is what I did. The striatum has a substantially uniform cross-sectional shape in the longitudinal direction, and its length is longer than its diameter. The striatum includes cables, ropes, rods, and the like.

In the fiber-reinforced plastic filament body end fixing structure according to the present invention, the end portion of the fiber-reinforced plastic filament body is covered with a cylindrical cushioning material, and the portion covered with the cylindrical cushioning material It is fixed in the socket by wedges with non-slip processing on the inner surface, and the cylindrical cushioning material is at least the outer surface of the friction cushioning sheet with friction-increasing particles attached to the outer surface and inner surface. A long and thin laminated sheet in which a metal mesh sheet woven with fine metal wires is laminated in a spiral is wound, and when the side ends of the spiral laminated sheet come into contact with each other, a cylinder with a diameter along the diameter of the above filament It is shaped to have a shaped hollow.

The method for fixing the end of a fiber-reinforced plastic filament according to the present invention comprises a long and thin laminated sheet in which a metal mesh sheet woven with fine metal wires is laminated on at least the outer surface of a friction buffering sheet having abrasive particles adhered to the outer and inner surfaces. A spirally wound tubular cushioning material, which is a cylindrical hollow with a diameter along the diameter of the filament that is covered by the tubular cushioning material when the side ends of the spiral laminated sheet are in contact with each other Prepare a tubular cushioning material shaped to hold, cover the end part of the filament made of fiber reinforced plastic with the tubular cushioning material, and place the part covered with the tubular cushioning material on the inner surface It is sandwiched by a wedge with a non-slip finish on the terminal socket, and it is wedged in the terminal socket.

The present invention also provides the tubular cushioning material described above. The cylindrical cushioning material according to the present invention comprises a friction cushioning sheet having abrasive particles adhered to its outer and inner surfaces, and a thin laminated sheet in which a metal mesh sheet woven with fine metal wires is laminated on at least the outer surface of the friction cushioning sheet, which is spirally wound. It is shaped so as to have a cylindrical hollow having a diameter along the diameter of the filament body covered with the cylindrical cushioning material when the side ends of the spiral laminated sheets come into contact with each other.

The friction cushioning sheet is based on a sheet material that has a cushioning function in the thickness direction, such as cloth (cloth), nonwoven fabric, paper, film, etc., and has abrasive particles on each of its front and back sides to increase frictional force. , for example, alumina particles, ceramic particles, diamond particles, etc. are adhered. The friction cushioning sheet may be formed in multiple layers, such as two layers, three layers, or four layers.

The metal mesh sheet is made by weaving fine metal wires (fine metal wires) with a fine mesh. The fine metal wires may be woven in any manner, and plain weave, twill weave, tortoise shell weave, tie rod weave, toncap weave, and other weaves may be employed. Fine wires of arbitrary metal materials such as stainless steel, iron, aluminum, brass, copper, titanium, Inconel, and Hastelloy can be used.

A fine metal wire in this specification refers to a metal wire with a diameter of 2.00 mm or less. If a metal wire with a diameter exceeding 2.00 mm is used, the strength of the laminated sheet comprising the metal mesh sheet in which multiple metal wires are woven becomes too high, making it difficult to form the laminated sheet into a cylindrical cushioning material. It may become difficult to attach). By constructing a laminated sheet using a metal mesh sheet in which multiple metal wires with a diameter of 2.00 mm or less are woven, it is laminated so as to have a cylindrical hollow with a diameter that follows the diameter of the fiber-reinforced plastic linear body. Easy to shape the sheet.

The number of meshes (the number of meshes per inch (25.4 mm)) of the metal mesh sheet can be arbitrary. However, since the metal mesh sheet covers the fiber-reinforced plastic filaments, it is preferable that the opening is not too large (the mesh is too coarse).

The end portions of the fiber reinforced plastic filaments are wedged into the end sockets. For example, a wedge split in half longitudinally with a non-slip inner surface (two halves), or a wedge split in three or four longitudinally with a non-slip inner surface The end portion of the filamentary body made of fiber-reinforced plastic is sandwiched between the (three-divided body and the four-divided body) and pushed into the terminal socket. The terminal socket has a wedge-shaped hollow. A wedge that sandwiches the end portion of the fibre-reinforced plastic filament is tightly pushed into the hollow of the terminal socket, thereby anchoring (fixing) the end socket to the end portion of the fibre-reinforced plastic filament via the wedge. .

A cylindrical shock absorbing material is put on the end portion of the fiber-reinforced plastic filament to be wedged. That is, the wedge is not directly engaged with the fiber-reinforced plastic filamentary body, but the cylindrical cushioning material is interposed between the filamentary body and the wedge. The localized shear force generated by the wedge tightening the fibre-reinforced plastic filament from its perimeter is damped and dispersed by the tubular cushioning material, so that the fibre-reinforced plastic filament is positioned at the terminal socket. (Wedge position) is less likely to be damaged, and high fixing efficiency (tensile strength) can be ensured. Since the metal wire forming the metal mesh sheet has a small diameter, the metal mesh sheet does not locally apply a strong force to the FRP cable when it is clamped by the wedge with a strong force from the surroundings.

Since the tubular cushioning material contains a friction-buffering sheet with abrasive particles adhered to the front and back surfaces, even if it is pulled strongly in the longitudinal direction, the fiber-reinforced plastic filamentous body will snap into the terminal socket ( Wedge). Of course, the anti-slip processing on the inner surface of the wedge also contributes to the increase of the frictional force, effectively preventing the filaments from slipping out of the wedge. The inner surface of the wedge may be processed to prevent slippage, such as by groove processing or uneven processing on the inner surface of the wedge, or by fixing metal particles to the inner surface of the wedge.

Since the inner surface of the wedge is treated to prevent slippage, if the friction-absorbing sheet is strongly clamped by the wedge from the surroundings, the friction-absorbing sheet will bite into the inner surface of the wedge, breaking the friction-absorbing sheet and breaking the friction-absorbing sheet. It may adhere hard (stick) to the inner surface of the According to this invention, since the metal mesh sheet is laminated on at least the outer surface of the friction-absorbing sheet, the friction-absorbing sheet does not directly bite into the inner surface of the wedge, and damage to the friction-absorbing sheet can be prevented. As a result, sticking of the friction-buffering sheet to the inner surface of the wedge can be reduced or prevented. The metal mesh sheet laminated on at least the outer surface of the friction buffer sheet in this way functions as a protective material for the friction buffer sheet (a material that prevents the friction buffer sheet from sticking to the inner surface of the wedge). Of course, the local shearing force generated by the wedge strongly tightening the fiber-reinforced plastic filamentary body from its periphery is also buffered and dispersed by the metal mesh sheet, so the metal mesh sheet improves the fixing efficiency. also contribute to By interposing a metal mesh sheet between the inner surface of the wedge and the friction-absorbing sheet, the friction-absorbing sheet does not adhere to the inner surface of the wedge, or even if it does adhere, the amount can be reduced, making it easier to reuse the wedge. Become.

The metal mesh sheet may be overlapped not only on the outer surface of the friction buffering sheet but also on the inner surface. In this case, the metal mesh sheet is sandwiched between the fiber-reinforced plastic filaments and the friction-absorbing sheet, so that they do not come into direct contact with each other either. When the filamentary body made of fiber-reinforced plastic is composed of a twisted wire obtained by twisting a plurality of fiber bundles, spiral unevenness (or spiral grooves) is formed on the surface of the filamentous body. When the friction-absorbing sheet comes into direct contact with the linear body and is tightened by a strong force from the surroundings, the thickness of the friction-absorbing sheet is reduced at the convex portion of the surface of the linear body, and the concave portion (groove) is formed. It is conceivable that the thickness of the friction-absorbing sheet becomes thicker at , and the cushioning effect of the friction-absorbing sheet becomes uneven. By laminating the metal mesh sheet on the inner surface of the friction cushioning sheet, the shape retention effect of the friction cushioning sheet is produced, so that the cushioning action of the friction cushioning sheet can be made uniform over the entire surface of the linear body.

Furthermore, according to this invention, a laminated sheet obtained by laminating a friction buffering sheet and a metal mesh sheet is spirally wound, and when the side ends of the spiral laminated sheet come into contact with each other, the diameter along the diameter of the linear body A tubular cushioning material is provided which is pre-shaped to have a cylindrical hollow of . By covering the ends of fiber-reinforced plastic filaments with cylindrical cushioning materials at the site (if the filaments are passed through the cylindrical hollow of the cylindrical cushioning materials), the installation of the cylindrical cushioning materials is complete. do. The time required to anchor the terminal sockets to the striatum can be significantly reduced.

The cylindrical cushioning material is made by winding a long, thin laminated sheet in a spiral shape with a cylindrical hollow space. A spiral gap is formed (a spiral gap between the side ends), which expands the hollow diameter of the tubular cushion. By enlarging the hollow diameter of the tubular cushioning material, it becomes easier to cover the end portion of the filamentary body made of fiber-reinforced plastic with the tubular cushioning material. After covering the end portion of the filamentary body made of fiber-reinforced plastic with a tubular cushioning material, twisting the tubular cushioning material in a spiral direction narrows the hollow diameter of the tubular cushioning material. When the side edges of the laminated sheets come into contact with each other, the cylindrical cushioning material has a hollow diameter that follows the diameter of the fiber-reinforced plastic filamentary body (diameter equal to or slightly larger than the diameter of the filamentary body). , The cylindrical cushioning material can firmly cover the surface of the fiber-reinforced plastic filamentary body without loosening.

Both ends of the cylindrical cushioning material may be fixed to the outer surface of the filamentary body made of fiber-reinforced plastic by using a tape material or the like. Loosening of the cylindrical cushioning material can be prevented. Of course, if you attach a wedge to the part where the cylindrical cushioning material is covered and push it into the hollow of the terminal socket, the wedge will tighten the cylindrical cushioning material with a strong force from the surroundings, so the cylindrical cushioning material will loosen. never.

In one embodiment, the friction buffering sheet and the metal mesh sheet are adhered with an adhesive. Since the friction buffering sheet and the metal mesh sheet are not separated, it becomes easier to attach the tubular shock absorbing material to the filaments on site. In addition, by shaping the laminated sheet into a tubular shape before the adhesive is cured and then curing the adhesive in that state, the tubular shape can be firmly imparted to the laminated sheet.

Preferably, the longitudinal length of the cylindrical cushioning material is equal to or greater than the longitudinal length of the wedge. Since the entire length of the fiber-reinforced plastic filament that is clamped by the wedge can be covered by the cylindrical cushioning material, it is effective for the wedge to locally apply the shearing force to the fiber-reinforced plastic filament. is prevented.

In a preferred embodiment, the laminated sheet further comprises an anti-biting sheet laminated on the outer surface of the metallic mesh sheet. Adhesion of the friction-buffering sheet to the inner surface of the wedge can be more effectively prevented. The bite prevention sheet may be a metal mesh sheet, a metal foil, or a film with a metal foil.

FIG. 3 is a perspective view of applying the terminal fixing structure to the terminal end of a cable made of carbon fiber reinforced plastic; It is a perspective view which shows the manufacturing process of terminal fixing structure. FIG. 2 is a partially cutaway enlarged perspective view of a flattened cylindrical cushioning material (laminated sheet). FIG. 4 is an enlarged cross-sectional view of the tubular cushioning material taken along line IV-IV of FIG. 3; It is sectional drawing which shows the manufacturing process of a terminal fixing structure. It is a perspective view which shows the manufacturing process of terminal fixing structure. It is a perspective view which shows the inner surface of a wedge. It is sectional drawing which shows the manufacturing process of a terminal fixing structure. It is sectional drawing which shows the manufacturing process of a terminal fixing structure.

FIG. 1 is a perspective view showing an embodiment in which a terminal fixing structure is applied to the terminal end of a carbon fiber reinforced plastic (CFRP) cable (hereinafter referred to as CFRP cable 1). Since the details of the terminal fixing structure shown in FIG. 1 will be clarified by explaining the manufacturing process thereof, the manufacturing process of the terminal fixing structure shown in FIG. 1 will be described below with reference to FIGS.

The CFRP cable 1 is constructed by further twisting a plurality of twisted wires having a circular cross section and made of a composite material of carbon fiber and epoxy resin. The stranded wire is formed with a circular cross section by a large number of continuous carbon fibers and an epoxy resin impregnated in the large number of carbon fibers. FIGS. 1 and 2 show a CFRP cable 1 having a 1×7 structure (a structure in which six twisted wires are twisted around a single twisted wire). The structure and diameter of the CFRP cable 1 can be designed arbitrarily.

The tubular cushioning material 2 that covers the CFRP cable 1 near its end portion is formed by forming an elongated laminated sheet 2A (the structure of which will be described in detail later) enlarged in FIG. 3 into a tubular shape. The elongated laminated sheet 2A is helically wrapped around a bar (which may be the CFRP cable 1 itself) that follows the diameter of the CFRP cable 1, preferably with the same diameter, and the laminated sheet 2A is wound into a cylinder of approximately the same diameter as the CFRP cable 1. The cylindrical cushioning material 2 is made by giving a cylindrical shape having a hollow shape.

The side edges of the laminated sheet 2A forming the cylindrical cushioning material 2 are not bonded together. For this reason, for example, when both ends of the cylindrical cushioning material 2 are grasped with both hands and twisted (rotated) in the direction opposite to the spiral direction, a spiral shape is formed between the adjacent laminated sheets 2A (between the side ends). A gap is formed and the hollow diameter of the cylindrical cushioning material 2 expands. Conversely, when the tubular cushioning material 2 is twisted along the spiral direction, the gap between the adjacent laminated sheets 2A narrows and the side ends of the laminated sheets 2A come into contact with each other. The diameter of the cylindrical cushioning material 2 when the side ends of the laminated sheet 2A are in contact with each other is substantially equal to the diameter of the CFRP cable 1.

3 and 4, the laminated sheet 2A consists of a SUS mesh sheet 2e, a friction buffering sheet 2d, a SUS mesh sheet 2c, and a SUS mesh sheet 2a laminated in this order from the inner surface toward the outer surface. made by The innermost SUS mesh sheet 2e contacts the CFRP cable 1, and the outermost SUS mesh sheet 2a contacts a wedge 6, which will be described later. SUS means alloy steel containing 1.2% or less of carbon and 10.5% or more of chromium, and the total content of elements other than iron does not exceed 50%, and is a rust-resistant special steel. Other metals or alloys having the same strength as SUS, such as stainless steel, iron, aluminum, brass, copper, titanium, Inconel, Hastelloy, and alloys thereof can also be used.

The SUS mesh sheets 2c and 2e are woven wire meshes obtained by plain weaving a large number of SUS fine wires having a relatively fine wire diameter of 0.47 mm, for example. Instead of plain weave, twill weave, tortoise shell weave, tie rod weave, toncap weave, or other weaves may be used to weave the SUS fine wire. In order to facilitate the shaping of the laminated sheet 2A (Fig. 3) into the tubular cushioning material 2 (Fig. 2), the thin SUS wires forming the SUS mesh sheets 2c and 2e have a diameter of 2.00 mm or less.

The friction buffering sheet 2d is made by bonding (applying) a large number of alumina particles 3 as a friction increasing material to the front and back surfaces of a synthetic fiber cloth. Alumina particles 3 are used to enhance the frictional force (illustration of alumina particles 3 is omitted in FIG. 4). Depending on the thickness of the single layer of the friction cushioning sheet 2d, a plurality of friction cushioning sheets 2d can be stacked and used, and FIG. It is

Instead of the synthetic fiber cloth, other cloth, non-woven fabric, paper, film, or other sheet material having a cushioning function in the thickness direction may be used as the friction cushioning sheet 2d.

The outermost SUS mesh sheet 2a is, for example, a woven wire mesh obtained by plain weaving or twill weaving a large number of SUS fine wires with a diameter of 0.47 mm. The outermost SUS mesh sheet 2a can also be made of a metal or alloy other than SUS, and the diameter of the SUS thin wire constituting the SUS mesh sheet 2a is 2.00 mm or less. As for the SUS mesh sheet 2a, a metal foil or a film sheet with metal foil may be used instead of a mesh sheet woven with fine SUS wires.

Referring to FIG. 4, adhesive 2b is applied between outermost SUS mesh sheet 2a and adjacent SUS mesh sheet 2c. The adhesive 2b permeates the SUS mesh sheet 2a, the SUS mesh sheet 2c, the friction buffering sheet 2d, and the SUS mesh sheet 2e, thereby all the SUS mesh sheets 2a, 2c, 2e and the friction buffering sheet constituting the laminated sheet 2A. 2d are glued together and integrated. Although FIG. 4 emphasizes that the adhesive 2b has a thickness, the adhesive 2b permeates as described above, so the thickness is almost gone. The adhesive 2b may be supplied from the outside of the outermost SUS mesh sheet 2a, or may be supplied between the sheets.

The SUS mesh sheets 2a, 2c, and 2e constituting the laminated sheet 2A are plasticized by winding the laminated sheet 2A around a bar having a diameter corresponding to the diameter of the CFRP cable 1 in contact with each other in a spiral shape and leaving the laminated sheet 2A for a while. It is deformed and given a cylindrical shape having a hollow having a diameter along the diameter of the CFRP cable 1 as described above to form the cylindrical cushioning material 2 . Of course, the adhesive 2b is also useful for holding the cylindrical shape.

Referring to FIG. 2 , a CFRP cable 1 is passed through a tubular cushioning material 2 , and the end portion of the CFRP cable 1 is covered with the tubular cushioning material 2 . The length of the cylindrical cushioning material 2 should be longer than the length of the wedge 6 described later in the longitudinal direction. The outer peripheral surface of the CFRP cable 1 is covered with the tubular cushioning material 2 so as to wrap the outer peripheral surface of the end portion of the CFRP cable 1 . If the tubular cushioning material 2 is loosened and a spiral gap is formed, the tubular cushioning material 2 may be twisted in the spiral direction. The CFRP cable 1 is covered with the tubular cushioning material 2 without looseness (without gaps).

Both ends of the cylindrical cushioning material 2 may be simply fixed near the end of the CFRP cable 1 using an adhesive tape or the like. Adhesive tape or the like is provided (fixed) in advance on one end or both ends of the tubular cushioning material 2, and by winding this around the CFRP cable 1, the tubular cushioning material 2 is fixed near the end of the CFRP cable 1. You may

1, 5, 6 and 7, terminal sockets (terminal sleeves) 5 and four wedges 6 are provided. The terminal socket 5 is made of metal (for example, stainless steel or iron), has a cylindrical outer shape, and has a substantially conical hollow 5a inside. A thread groove 5d is formed on the outer peripheral surface of the terminal socket 5 near the distal end thereof. The end portion of the CFRP cable 1 covered with the tubular cushioning material 2 is inserted into the hollow 5a of the terminal socket 5 from the small opening 5b side of the terminal socket 5, and is taken out from the large opening 5c side.

Four wedges 6 are attached to the terminal portion of the CFRP cable 1 that is exposed to the terminal socket 5 . Each of the four wedges 6 has the same shape, and a shallow depression 6a is formed in the inner surface thereof in the longitudinal direction. is formed. The shape (including depth) of the depression 6a is the same in the longitudinal direction. On the other hand, the thickness of the wedge 6 increases from the tip toward the end. The combination of the four wedges 6 results in a generally conical outer shape (FIG. 6), which substantially matches the shape of the hollow 5a of the terminal socket 5. As shown in FIG. A plurality of grooves 6b in the recess 6a on the inner surface of the wedge 6 are formed for slip prevention (improvement of frictional force).

The recess 6a on the inner surface of the wedge 6 is shallow, and the entire end portion of the CFRP cable 1 (the portion where the cylindrical cushioning material 2 is located) does not enter the recess 6a, and the end portion of the CFRP cable 1 is sandwiched. , there is a gap in the longitudinal direction between adjacent wedges 6 .

Referring to FIG. 8, the wedge 6 is pushed into the hollow 5a of the terminal socket 5 from the wide opening side of the terminal socket 5. As shown in FIG. Referring to FIG. 9, when the wedges 6 are further pushed into the terminal socket 5, the four wedges 6 are pressed from the periphery by the inner wall of the terminal socket 5 and tightened. From this, the end socket 5 is fixed to the end of the CFRP cable 1 via the wedge 6 and the tubular cushioning material 2 described above (FIG. 1).

Table 1 shows the test results of evaluation tests conducted for each of six terminal fixing structures (Examples 1 to 5, Comparative Example) having different structures.

In the evaluation test, as shown in Table 1, SUS mesh sheets 2c and 2e were laminated on the outer and inner surfaces of the friction cushioning sheet 2d, respectively, and the SUS mesh sheet 2a was further laminated on the outer SUS mesh sheet 2c. A terminal fixing structure was produced using the cylindrical cushioning material 2 formed from the sheet 2A (see FIGS. 2 and 3), and a tensile test was performed on the produced terminal fixing structure (Example 1). A tensile test was also conducted on a terminal fixing structure using a cylindrical cushioning material in which an aluminum mesh sheet (mesh sheet made of plain woven aluminum wires) was laminated in place of the SUS mesh sheet 2a (Example 2).

In the evaluation test, a laminated sheet comprising a friction-absorbing sheet 2d and a SUS mesh sheet 2c laminated on the outer surface of the friction-absorbing sheet 2d without providing the outermost-layer SUS mesh sheet 2a and the innermost-layer SUS mesh sheet 2e A terminal fixing structure (Example 3) created using a cylindrical cushioning material composed of a friction cushioning sheet 2d and SUS laminated on the inner and outer surfaces of the friction cushioning sheet 2d without providing the outermost layer SUS mesh sheet 2a A terminal fixing structure (Example 4) made by using a cylindrical cushioning material composed of a laminated sheet comprising mesh sheets 2c and 2e, and a polyester mesh sheet woven with polyester wires was used instead of the outermost SUS mesh sheet. Terminal fixing structure (Example 5) created using a cylindrical cushioning material composed of laminated sheets laminated as the outermost layer, and terminal fixing created using a cylindrical cushioning material composed only of the friction cushioning sheet 2d Tensile tests were also performed on each of the structures (comparative examples).

As the CFRP cable 1, a stranded wire with a diameter of about 5.00 mm made of a composite material of carbon fiber and epoxy resin has a 1 × 7 structure (one stranded wire is centered and 6 stranded wires are twisted around it. A diameter of about 15.2 mm was used. The guaranteed breaking load of this CFRP cable 1 is 270 kN.

In the tensile test, the terminal socket 5 was fixed to one end of the CFRP cable 1 of a predetermined length by the terminal fixing structure using the wedge 6 described above, and the terminal socket 5 was fixed to the other end by the terminal fixing structure using thermosetting resin. fixed. The terminal sockets at both ends were set in a tensile tester, and one of the terminal sockets with a terminal fixing structure using thermosetting resin was pulled at a predetermined tensile speed.

In the evaluation test, except for the comparative example, the fixing efficiency test was performed multiple times for each of the terminal fixing structures, and the fixing efficiency (%) was calculated for each of the multiple tests. Tables 1 and 2 show the minimum (Min.) and maximum (Max.) values of the fixing efficiency (%) obtained in a plurality of tests, excluding comparative examples. Fixing efficiency is calculated by the following equation.

Fixing efficiency (%)
= breaking load (or dropout load) / guaranteed breaking load (= 270 kN) × 100

In the evaluation test, the fixing time was also measured. As described above, the end of the CFRP cable 1 is fitted with a tubular cushioning material, the wedge 6 is fitted, and finally the wedge 6 is pushed into the end socket 5, thereby fixing the end socket 5 to the end of the CFRP cable 1. be. "Fixing time" in Table 1 indicates "OK" when the time required to attach the cylindrical cushioning material was less than 1 minute.

Furthermore, in the evaluation test, after the fixing efficiency test described above is completed, the wedge 6 is pulled out from the terminal socket 5, the wedge 6 is disassembled, and the inner surface of the wedge 6 is visually checked to see if the friction cushioning sheet 2d or the like is attached. confirmed. "Attachment to wedge" in Table 1 indicates "No" if adhesion of the friction buffer sheet 2d or the like cannot be confirmed, and "Yes" if adhesion can be confirmed.

In the evaluation column of Table 1, either A, B or C is shown. A indicates a terminal fixing structure suitable for adoption as a terminal fixing structure, B indicates a terminal fixing structure that can be adopted, and C indicates a terminal fixing structure that is not suitable for adoption. .

Referring to Table 1, the fixing time never exceeded 1 minute for any of Examples 1 to 5 and Comparative Example. It can be seen that the cylindrical cushioning material is suitable for terminal fixing work on site.

Further, referring to Table 1, in all of Examples 1 to 5 and Comparative Example, the minimum value of fixing efficiency was 100% or more, and did not fall below the guaranteed breaking load. By interposing at least the frictional buffer sheet 2d between the CFRP cable 1 and the wedge 6, the CFRP cable 1 is prevented from being broken by a load less than the guaranteed breaking load, and the CFRP cable 1 is prevented from coming out of the terminal socket 5. It is a thing.

However, if the cylindrical cushioning material is composed only of the friction cushioning sheet 2d (comparative example), the maximum value of the fixing efficiency cannot be measured. When configured with the laminated SUS mesh sheet 2c (Example 3), the maximum value of the fixing efficiency was close to 100%. It can be seen that it is preferable to laminate the SUS mesh sheets 2c and 2e on both the outer surface and the inner surface of the friction cushioning sheet 2d if a margin is given to the maximum value of the fixing efficiency (Examples 1 and 2, Example 4). ~5).

Since the CFRP cable 1 is composed of a stranded wire obtained by twisting a plurality of fiber bundles (see FIGS. 1 and 2), the surface of the CFRP cable 1 is formed with irregularities (or spiral grooves). The friction buffering sheet 2d is in direct contact with the CFRP cable 1, and when it is tightened with a strong force from the surroundings, the thickness of the frictional buffering sheet 2d becomes thin at the convex portion of the surface of the CFRP cable 1, and the concave portion ( It is conceivable that the thickness of the friction-buffering sheet 2d becomes thicker in the groove), and the buffering effect of the friction-buffering sheet 2d becomes uneven. With reference to Embodiments 3 and 4, by laminating the SUS mesh sheet 2e also on the inner surface of the friction-absorbing sheet 2d, the shape-retaining effect of the friction-absorbing sheet 2d is generated, thereby extending the entire surface of the CFRP cable 1. It is considered that the buffering effect of the friction buffering sheet 2d is made uniform and the fixing efficiency is improved.

In Example 5, the SUS mesh sheets 2c and 2e are laminated on the inner and outer surfaces of the friction cushioning sheet 2d, and a polyester mesh sheet is laminated on the outermost layer to form a cylindrical cushioning material. value was slightly lower. This is because the outermost polyester mesh sheet is easily crushed, and the frictional force between the polyester mesh sheet and the wedge 6 in contact with it is weakened (the grooves 6b on the inner surface of the wedge 6 do not rub against the polyester mesh sheet strongly). ). A metal material is considered to be suitable for the material constituting the outermost layer of the cylindrical cushioning material.

After the tensile test was completed for the terminal fixing structures of Examples 1 to 5 and the comparative example, the wedge 6 was pulled out from the terminal socket 5 and the wedge 6 was disassembled. It was confirmed that the friction cushioning sheet 2d was firmly attached (sticked) to the recess 6a on the inner surface of the wedge 6 over a wide area. This is because, as described above, a plurality of grooves (unevennesses, blades, teeth) 6b for slip prevention are formed in the recesses 6a on the inner surface of the wedge 6 (see FIG. 7), and the inner surface of the wedge 6 is It is believed that they strongly rubbed against the friction buffering sheet 2d, and as a result, the frictional buffering sheet 2d was damaged and tightly embedded in the groove 6b. When the wedge 6 is reused, the friction-buffering sheet 2d adhered to the inner surface of the wedge 6 must be completely removed, which requires a considerable amount of time. Adhesion of the friction-absorbing sheet 2d to the inner surface of the wedge 6 was also confirmed in Examples 3 to 5, although it was not as extensive as in the comparative example. On the other hand, in Examples 1 and 2, the friction cushioning sheet 2d did not adhere to the inner surface of the wedge 6. If the wedge 6 needs to be reused, it is preferable to laminate a metal mesh sheet on at least the outer surface of the friction-absorbing sheet 2d, and more preferably adhere the friction-absorbing sheet 2d to the inner surface of the wedge 6. It can be seen that it is preferable to further laminate a sheet (the outermost layer SUS mesh sheet 2a described above) (anti-biting sheet) to prevent jamming.

Referring to Examples 1 and 2, the cylindrical cushioning material 2 in which the SUS mesh sheets 2c and 2e are laminated on the outer and inner surfaces of the friction cushioning sheet 2d, and the SUS mesh sheet 2a is further laminated on the outermost layer, the fixing efficiency It was confirmed that the toner was high, the fixing time was short, and there was no adhesion to the wedge 6. It was also confirmed that the wire diameter of the metal wire constituting the outermost SUS mesh sheet 2a does not significantly affect the fixing efficiency. As in Example 1, Example 2, in which an aluminum mesh sheet was laminated as the outermost layer in place of the SUS mesh sheet 2a, was also highly evaluated.

Reference Signs List 1 CFRP cable 2 Cylindrical cushioning material 2A Laminated sheet 2a, 2c, 2e SUS mesh sheet 2b Adhesive 2d Friction cushioning sheet 3 Alumina particles 5 Terminal socket 6 Wedge 6b Groove

Claims (7)

The terminal part of the fiber-reinforced plastic filament is covered with a cylindrical cushioning material, and the part covered with the cylindrical cushioning material is sandwiched in the terminal socket by a wedge with a non-slip inner surface. A terminal fixing structure of a fiber-reinforced plastic filament that is fixed,
The tubular cushioning material is
A long and thin laminated sheet in which a metal mesh sheet woven with fine metal wires is laminated on at least the outer surface of a friction cushioning sheet with abrasive particles attached to the outer and inner surfaces is spirally wound, and the side edges of the spiral laminated sheet are wound together. is shaped to have a cylindrical hollow with a diameter that follows the diameter of the striatum when they come into contact,
Terminal fixation structure of striatum made of fiber-reinforced plastic. The diameter of the fine metal wire constituting the metal mesh sheet is 2.00 mm or less,
The terminal fixing structure of the fiber-reinforced plastic filament body according to claim 1. The friction buffering sheet and the metal mesh sheet are adhered with an adhesive,
3. The terminal fixing structure of the fiber-reinforced plastic filament body according to claim 1 or 2. The length in the longitudinal direction of the cylindrical cushioning material is equal to or greater than the length in the longitudinal direction of the wedge,
The terminal fixing structure of the fiber-reinforced plastic filament body according to any one of claims 1 to 3. The laminated sheet further comprises an anti-bite sheet laminated on the outer surface of the metal mesh sheet,
The terminal fixing structure of the fiber-reinforced plastic filament body according to any one of claims 1 to 4. Cylindrical cushioning material comprising a friction cushioning sheet with abrasive particles adhering to its outer and inner surfaces, and a metal mesh sheet woven with fine metal wires laminated on at least the outer surface of the friction cushioning sheet spirally wound. preparing a cylindrical cushioning material shaped so as to have a cylindrical hollow with a diameter along the diameter of the filament body covered by the cylindrical cushioning material when the side ends of the laminated sheets of the shape are in contact with each other;
Cover the ends of the filamentary body made of fiber-reinforced plastic with the above-mentioned cylindrical cushioning material,
The portion covered with the cylindrical cushioning material is sandwiched by a wedge with an anti-slip inner surface, and this is wedged in the terminal socket.
A terminal fixing method for a fiber-reinforced plastic striatum. A tubular cushioning material comprising a friction cushioning sheet having abrasive particles attached to its outer and inner surfaces, and a thin laminated sheet in which a metal mesh sheet woven with fine metal wires is laminated on at least the outer surface of the friction cushioning sheet, which is spirally wound,
It is shaped so as to have a cylindrical hollow with a diameter along the diameter of the filament body over which the cylindrical cushioning material is covered when the side ends of the spiral laminated sheet come into contact with each other,
Tubular cushioning material.

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