• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    Structure and method of end anchoring for fiber reinforced plastic filament body One end portion of a carbon fiber reinforced plastic cable (1) is covered with a friction sheet (2) having adhered abrasive particles (2a) to the upper and lower surfaces thereof, the friction sheet is covered from above with a braided mesh tube (3) obtained by braiding a steel wire, and to the part covered with the friction sheet (2) and braided mesh tube (3) is wrapped and protected within a final socket (4) by a wedge (5). The end socket (4) can be reliably and quickly secured to the end portion of the carbon fiber reinforced plastic cable (1) while maintaining a comparatively high anchoring efficiency.
    公开号:BR112012002984B1
    申请号:R112012002984-3
    申请日:2010-08-06
    公开日:2019-10-15
    发明作者:Shinobu Kondo；Kenichi Ushijima
    申请人:Tokyo Rope Manufacturing Co., Ltd.；
    IPC主号:
    专利说明:

    “EXTREMITY ANCHORAGE STRUCTURE AND METHOD FOR FIBER REINFORCED PLASTIC BODY BODY”
    Field of the Invention [001] The present invention relates to an anchoring structure and method for anchoring (fixing) a socket (anchoring device) to the end portion of a filament body made of fiber-reinforced plastic.
    Background of the Invention [002] FRP (fiber-reinforced plastic), composed of a composite of fiber and plastic has a high strength, and a cable (rope or stick) manufactured using FRP is light in weight compared to stranded PC wire and has excellent characteristics, such as high resistance to corrosion and a non-magnetic property. Fibers, such as carbon fibers, glass fibers and Kevlar fibers, have been used as fiber material used in FRP, and resins such as epoxy resin, polyamide resin and phenol resin have been used as plastic material in FRP. FRP cables are being used as strength members in pre-pressed concrete, as an example.
    [003] While a FRP cable has a high resistance equivalent to that of stranded PC wire in relation to the tension in the longitudinal direction, it is weak against local shear force and scratches on the surface, etc. As a consequence, when a socket is attached to the final portion of the cable directly by forcing into a wedge in a manner similar to that of a stranded PC wire, due to the shear and slip damage due to the damage of the surface layer that occurs and a high efficiency anchor between the cable and the socket cannot be obtained.
    [004] In order to arrange it so that shear force will not concentrate on the cable locally on the anchoring portion of the socket (fixing portion), the conventional approach is to insert the end of the cable into the socket, followed by filling the gap between the cable and the socket with a thermosetting resin and then the hardening of the resin, or fill the gap with a cable expansion and integration agent and the socket itself due to the expansion pressure of the expansion agent (for example, see Laid-Open Patent Application No. 1-272,889).
    [005] With respect to both thermosetting and expanding resin agents, however, it takes a certain amount of time for the resin to harden or for the blowing agent to expand. In addition, since strict temperature management is required during hardening or expansion, a special device and space for the device is mandatory. If it is difficult to secure the socket for the end of the cable at the workplace, etc., the warranty is required beforehand at the factory.
    Description of the Invention [006] An object of the present invention is to organize it in such a way that a socket
    Petition 870190033213, of 5/5/2019, p. 5/18
    2/9 nal can be secured quickly and reliably to the end portion of a fiber-reinforced plastic filament body, while maintaining a comparatively high anchoring efficiency.
    [007] The fiber-reinforced plastic filament body is obtained by forming filaments in a material that is the result of composing (mixing) a fiber material, such as carbon fiber, glass fiber or Kevlar fiber and a resin material, such as epoxy resin, polyamide resin or phenol resin. The filament body substantially has a uniform cross-sectional shape in the longitudinal direction and a length that is relatively large compared to the diameter. The filament body is even made of a cable, rope, or rod, etc.
    [008] An end anchoring structure of a fiber reinforced plastic filament body according to the present invention is characterized by the fact that a final portion of a fiber reinforced plastic filament body is covered with a sheet of friction having abrasive particles adhered to the upper and lower surfaces thereof, the friction sheet is covered from above with a braided net tube obtained by braiding a metal wire, and the part covered with the friction sheet and braided net tube it is wrapped and protected inside a final socket by a wedge.
    [009] A method of anchoring one end of a fiber-reinforced plastic filament body according to the present invention comprises covering a final portion of a fiber-reinforced plastic filament body with a friction sheet having adhered abrasive particles to the upper and lower surfaces of it, additionally covering the top friction sheet with a braided net tube obtained by braiding a metal wire, surrounding by a wedge the part covered with the friction sheet and braided net tube, and wedge this part inside a final socket.
    [0010] The end portion of the fiber-reinforced plastic filament body is secured inside the final socket. For example, the end portion of the fiber-reinforced plastic filament body is surrounded by a wedge (two half bodies), which has been split in half along the longitudinal direction, and the end portion is pushed into the final socket. It goes without saying that the final socket has a hollow part of the shape of which corresponds to the wedge. The wedge that embraces the end portion of the fiber-reinforced plastic filament body is pushed hard into the hollow part of the final socket, where the final socket is anchored (secured) to the end portion of the body of the reinforced plastic filament with fiber.
    [0011] According to the present invention, since the end portion of a fiber-reinforced plastic filament body is covered with a friction sheet and this is additionally covered from above with a braided tube obtained by braiding a metal wire, the local shear force acting on the filament body itself
    Petition 870190033213, of 5/5/2019, p. 6/18
    3/9 fiber-reinforced plastic for the wedge is dispersed (stored) by the friction sheet and the braided tube. The fiber-reinforced plastic filament body is not easily cut at the position of the final socket (the position of the wedge) and a high anchoring efficiency (tensile strength) can be ensured.
    [0012] Furthermore, according to the present invention, since the end portion of a fiber-reinforced plastic filament body is covered with a friction sheet obtained by adhering abrasive particles to its upper and lower surfaces, the reinforced body with plastic filament fiber it will not be promptly removed from the final socket (wedge), thanks to the frictional force, even if the filament body is pulled strongly in the longitudinal direction. In addition, since the braided tube is obtained by braiding a metal wire, a certain degree of frictional force is produced by the braided tube as well. The terminal portion of the fiber-reinforced plastic filament body will not readily pull the final socket due to both the friction sheet and the braided tube.
    [0013] As mentioned above, it is also possible for the terminal portion of a fiber-reinforced plastic filament body to be fixed within a final socket by a thermosetting resin or blowing agent or the like. However, with fixation through hardening of a resin or expansion, charging the blowing agent or thermosetting resin for hardening or expansion (integration) takes a certain amount of time and strict temperature management is required during hardening. or expansion. On the other hand, according to the present invention, a final socket is attached to the final portion of the wedge fiber-reinforced plastic filament body, and therefore the final socket can be attached to the final portion of the body of the reinforced plastic filament with fiber quickly and easily on site (at the workplace, etc.) without the need for temperature management. Since it is unnecessary to secure the final socket for the terminal portion of the fiber-reinforced plastic filament body in advance (on site, etc.), packaging and transport can be simplified. Since the position in which the final socket is secured can be changed freely, it is possible to deal with a sudden change in site specifications.
    [0014] In one embodiment, the abrasive particles are adhered to at least the inner peripheral surface of the braided tube. The frictional force between the braided tube and the friction sheet located on the inner side of the same peripheral is increased and sliding between the friction sheet and braided tube is effectively prevented. Abrasive particles can also be observed for the outer peripheral surface of the braided tube as a matter of course.
    [0015] Preferably, both the friction sheet and the braided tube used would have a length in the longitudinal direction of the same greater than the length of the wedge
    Petition 870190033213, of 5/5/2019, p. 7/18
    4/9 in the longitudinal direction of the same. The shear force attributable to the wedge is effectively prevented from acting on the fiber-reinforced plastic filament body locally, covering the area of the fiber-reinforced plastic filament body embraced by the wedge with the friction sheet and the woven mesh tube the entire length of the area.
    [0016] The friction sheet can be made of several layers, for example, two or three layers, and can cover the end portion of the fiber-reinforced plastic filament body.
    [0017] In one embodiment, the braided tube is obtained by braiding a wire formed by twisting a plurality of metal wires together. Since deformation readily occurs when pressure is applied to the wedge, the action of the storage can be amplified. In addition, the frictional force is increased by the roughness between the metal wires and between the wires.
    Brief Description of the Drawings [0018] Figure 1 is a perspective view in which an end anchoring structure has been applied to the end of a cable made of carbon fiber reinforced plastic;
    [0019] Figure 2 is a perspective view illustrating a step of fabricating an end anchoring structure;
    [0020] Figure 3 is a perspective view illustrating a step of fabricating an end anchoring structure;
    [0021] Figure 4 is a sectional view illustrating a step of fabricating an end anchoring structure;
    [0022] Figure 5 is a sectional view illustrating a step of fabricating an end anchoring structure, and [0023] Figure 6 is a sectional view illustrating a step of fabricating an end anchoring structure.
    Best Mode for Carrying Out the Invention [0024] Figure 1 is a perspective view illustrating a modality in which an end anchoring structure has been applied to the end of a carbon fiber reinforced plastic (CFRP) cable [also known as Carbon Fiber Composite Cable (CFCC)] (written as a CFRP cable below). Once the details of the end anchoring structure shown in figure 1 will become apparent, describing the steps for manufacturing them, the steps of fabricating the end anchoring structure shown in figure 1 will be described with reference to figures 2 to 6.
    [0025] With reference to figure 2, a CFRP 1 cable is prepared and the surroundings of the final portion of the cable are covered with a friction sheet 2. The CFRP 1 cable is for
    Petition 870190033213, of 5/5/2019, p. 8/18
    5/9 made for twisting the threads together having a circular cross section, a composite of carbon fibers and epoxy resin being adopted as the material that constitutes the threads. The CFRP cable shown in Figure 2 has a 1 x 6 structure (the structure in which six wires are twisted over the periphery of a single wire in the center).
    [0026] The friction sheet 2, which covers the surroundings of the final portion of the CFRP 1 cable, is obtained through the adhesion (application) of a multiplicity of abrasive particles 2a (aluminum oxide, silicon carbide, etc.) to the upper and lower surfaces of a sheet such as synthetic fiber (or metallic mesh having a fine mesh) and exhibits flexibility. In this embodiment, abrasive particles 2a are used to increase the frictional force. The friction sheets 2 are curved along the outer periphery of the CFRP cable 1.
    [0027] The length of the friction sheet 2 is greater than the longitudinal length of a wedge 5, described later, and its width is slightly less than the cross-sectional semicircle of the CFRP 1 cable. The outer peripheral surface of the CFRP cable 1 is covered with a pair of friction sheets 2, so as to wrap the outer peripheral surface of the final portion of the CFRP cable 1. Preferably, two (or three) of the friction sheets 2 are superimposed on two ( or three) layers and these cover the outer peripheral surface of the CFRP 1 cable. These can be arranged so that one end or both ends of the friction sheet 2 are easily attached near the final portion of the CFRP 1 cable using a adhesive tape or similar. As shown in figure 2, the CFRP cable 1 can be covered with a pair of friction sheets 2, so as to be surrounded by the sheets, or, alternatively, the friction sheet 2 can be helically wound over the cable CFRP 1.
    [0028] With reference to figure 3, the final portion of the CFRP cable 1 covered with the friction sheet 2 is subsequently covered with a braided tube 3. The braided tube 3 shown in figure 3 is obtained by forming of two sets of wires 3a, each wire of which is the result of twisting together a plurality of steel or iron wires having Vickers hardness of 100 to 300, and braiding the two sets of wires in a tubular form. The braided tube 3 has a cavity along its longitudinal direction and exhibits stretching capability.
    [0029] Similar to the friction sheet 2, the braided tube 3 also has a length greater than the longitudinal length of the wedge 5, described below. The length of the braided tube 3 can be shorter or longer than the length of the friction sheet 2.
    [0030] Since the braided tube of network 3 is capable of stretching, the diameter of the cavity is enlarged when both ends of the tube are gripped and approach each other. On the other hand, the diameter of the cavity is reduced when both ends of the tube are gripped and separated from each other. If both
    Petition 870190033213, of 5/5/2019, p. 9/18
    6/9 the ends of the braided tube 3 are pulled in the direction that separates them from each other in a state in which the part of the CFRP cable 1 covered with the friction sheet 2 is located inside the cavity of the braided tube 3, the diameter of the cavity of the braided tube 3 decreases and the braided tube 3 comes into intimate contact with the surface of the friction sheet 2.
    [0031] With reference to figure 4, a final socket 4 and a wedge 5 are prepared. The final socket 4 is made of metal (for example, stainless steel or iron), the external shape of which is cylindrical and has an approximately tapered hollow part 4a inside it. The final portion of the CFRP cable 1, which is covered with the braided tube 3 is inserted into the hollow part 4a of the final socket 4 on the side of a small opening 4b of the final socket 4 and emerges from the side of a large opening 4c.
    [0032] The wedge 5 is fitted to the final portion of the CFRP cable 1, which has emerged out of the final socket 4. The wedge 5 comprises a half upper body 5a and a half lower body 5b which are identical in shape. When the upper half body 5a and the lower half body 5b are combined, the result is an approximately conical outer shape. The approximately conical outer shape of the wedge 5 obtained by combining the half upper body 5a and half lower body 5b is substantially identical to the approximately conical hollow part 4a of the final socket 4.
    [0033] The shallow recess 5c, which has the shape of a semicircular column, is formed longitudinally on the inner surface of each of the half upper body 5a and half lower body 5b (see Figure 1). A part of the braided tube 3 is placed in the recesses 5c of the upper half body 5a and half lower body 5b. Since the recesses 5c are shallow, a gap is formed in the longitudinal direction between the upper half body 5a and the lower half body 5b in a state in which the final portion of the CFRP cable 1 is wrapped without the entire end portion of the CFRP cable 1 (the part where the braided tube 3 is located) that is being mounted in the recesses 5c.
    [0034] With reference to figure 5, the wedge 5 is pushed into the hollow part 4a of the final socket 4 on the side of the final socket 4 having the large opening. With reference to figure 6, the upper half body 5a and the lower half body 5b are contained and protected from its periphery by the internal wall of the final socket 4 when the wedge 5 is pushed strongly into the final socket 4. As a result, the final socket 4 is attached to the end portion of the CFRP cable 1 through the wedge 5 (plus the braided mesh tube 3 and the friction sheet 2 described above) (see Figure 1).
    [0035] Table 1 illustrates the results of an evaluation test applied to each of the six final anchoring structures (Samples 1 to 6) having different structures.
    ---- Sample1 Sample2 Sample3 Sample4 Sample5 Sample 6
    Petition 870190033213, of 5/5/2019, p. 10/18
    7/9
    STORAGE BRAIDED NETWORK TUBE TUBE OFALUMINUM WIRE DIAMETER(mm) 0.20 0.40 0.25 0.60 0.40STRING CONFIGURATION 1x7 1x7 3x7 1x7 1x7DIAMETER OFCORD (mm) 0.60 1.20 1.62 1.80 1.20FRICTION SHEET WITH WITH WITH WITH WITHOUT WITH EFFECTIVENESS OFANCHORAGE(%) Min 85 98 95 89 43 77 Max 97 105 102 99 65 90 EVALUATION YES YES YES YES NO NO
    [0036] According to the evaluation test, as shown in Table 1, end anchoring structures (samples) were manufactured, having a WIRE DIAMETER different from the wire that constitutes the braided net tube 3, STRING CONFIGURATION and DIAMETER The strings of the strings 3a each obtained by twisting a plurality of wires, and FRICTION SHEET (with or without) covering the peripheral surface of the CFRP 1 cable, and each of the manufactured end anchor structures was subjected to (samples 1 to 5). In addition, an end anchoring structure obtained by surrounding the friction sheet 2 with an aluminum tube instead of the braided tube 3 was manufactured and subjected to tensile tests (sample 6).
    [0037] Used as the CFRP cable 1 was one having a diameter of about 12.5 mm in which the wires having a diameter of about 4.2 mm, consisting of a composite of carbon fibers and epoxy resin, was arranged in a 1 x 7 structure (the structure in which seven threads are braided over the periphery of a single thread in the center). The assured breaking load of the CFRP 1 cable was 184 kN and the actual breaking load was 200 kN.
    [0038] In the tensile test, the final socket 4 was secured to one end of the CFRP cable 1 of a length prescribed by the end anchoring structure using the aforementioned wedge 5, and a final socket was secured to the other end by a end anchoring structure using a thermosetting resin. The final sockets at both ends were placed in a tensile tester and the terminal socket with the end anchoring structure using the thermosetting resin was tensioned at a prescribed tensioning speed.
    [0039] In addition, in the tensile test, each of the samples was submitted to the test
    Petition 870190033213, of 5/5/2019, p. 11/18
    8/9 t several times and the anchoring efficiency (%) was calculated for each test performed several times. Presented in Table 1 are the minimum (Min) and maximum (Max) values of anchoring efficiency (%), obtained in tests performed several times. The anchoring efficiency is calculated according to the following equation:
    anchoring effectiveness (%) = breaking load (or load retracted) / guaranteed breaking load (= 184 kN) x 100 [0040] With reference to Table 1, there are times when the anchoring efficiency drops below 100% when the end anchoring structure using wedge 5 is adopted. The reason for this is that in the part of the end anchoring structure, the CFRP 1 cable is wrapped from its periphery and therefore the CFRP 1 cable breaks easily or is damaged in the part of the end anchoring structure. In the evaluation section of Table 1, a YES is shown for samples for which an anchoring effectiveness of 95% or more was obtained as the maximum value, and a NO is shown for samples for which only an anchoring effectiveness less than 95% was obtained as the maximum value.
    [0041] With reference to the test results on sample 5, the CFRP cable 1 pulled from the final socket 4 during the tensile tests and only a small anchoring efficiency can be obtained with respect to the end anchoring structure (WITHOUT leaf friction cable) where the CFRP cable 1 is covered directly with the braided tube 3 without the interposition of the friction sheet 2. It will be understood that the friction sheet 2 is necessary to obtain a high anchoring efficiency (a high resistance traction).
    [0042] With reference to sample 6, the CFRP cable 1 pulled from the final socket 4 during the tensile tests and only a small anchoring efficiency could be obtained even with respect to the end anchoring structure obtained through the cable covering CFRP 1 with the friction sheet 2 and the top cover of it with the aluminum tube instead of the braided tube 3. It will be understood that the braided tube 3 is also necessary in order to obtain a high fixing efficiency.
    [0043] With the end anchoring structures (samples 1 to 4) obtained by covering the CFRP cable 1 with the friction sheet 2 and also the top cover with the braided net tube 3, the CFRP cable 1 does not remove from the final socket 4 in the tensile test. The anchoring efficiency was calculated for all samples 1 to 4 using the load that prevailed at the time of the CFRP 1 cable rupture.
    [0044] When comparing the test results for samples 2 and 3, it was confirmed that the disparity between the configurations (the 1 x 7 configurations and the 3 x 7 configurations) of the strands that make up the braided tube 3 does not have much effect about the anchoring effectiveness.
    Petition 870190033213, of 5/5/2019, p. 12/18
    9/9 [0045] On the other hand, with reference to the test results for samples 1 and 4, it was confirmed that, if the diameter of the wire of the wires that make up the braided tube 3 is reduced, thus reducing the wire diameter 3a (sample 1) or if the wire diameter of the wires that make up the braided tube 3 is enlarged to thereby increase the diameter of cord 3 (sample 4), then this will have an effect, albeit small, about the anchoring effectiveness. The anchoring efficiency did not drop below 95% if the diameter of the cord 3a constituting the braided mesh tube 3 was between 1.20 mm (Sample 2) and 1.62 mm (sample 3) · [0046] In the anchoring structures at the end of the method described above (samples 1 to 4), the final portion of the CFRP cable 1 is covered with the friction sheet 2 coated with the particles with abrasives 2a, and this is covered from above with the braided tube tube 3 obtained for braiding the strands 3a. However, a multiplicity of abrasive particles (aluminum oxide, silicon carbide, etc.) may very well be adhered (applied) also to the inner peripheral surface of the braided tube 3. This will make it even more difficult for the final portion of the CFRP cable 1 pull out of the final socket 4. It goes without saying that the multiplicity of abrasive particles 2a may very well be adhered (applied), not only to the inner peripheral surface of the braided tube 3, but also to the peripheral surface external part.
    权利要求:
    Claims (6)
    [1]
    1. End anchoring structure for a fiber reinforced plastic filament body (1), the end anchoring structure comprising a sheet covering an end part of the fiber reinforced plastic filament body (1), wherein the sheet exhibits flexibility, the end anchoring structure additionally comprises a final socket (4) and a wedge (5),
    CHARACTERIZED by the fact that the sheet is a friction sheet (2) having abrasive particles (2a) adhered to the top and bottom surfaces thereof, and that the end anchoring structure additionally comprises a braided lace tube (3) obtained by braiding a metal wire, in which the friction sheet (2) is covered from above with the braided net tube (3), and in which the part covered with said friction sheet (2) and the braided net tube (3) is wrapped and fixed inside the final socket (4) by the wedge (5).
    [2]
    2. End anchoring structure according to claim 1, CHARACTERIZED by the fact that said friction sheet (2) and said braided net tube (3) both have a length in the longitudinal direction of the same greater than the length of said wedge (5) in the longitudinal direction thereof.
    [3]
    End anchoring structure according to claim 1 or 2, characterized by the fact that said friction sheet (2) covers said fiber reinforced plastic filament body (1) in multiple layers.
    [4]
    End anchoring structure according to any one of claims 1 to 3, CHARACTERIZED by the fact that said braided tube (3) is obtained by braiding a wire (3a) formed by twisting a plurality of metal wires .
    [5]
    End anchoring structure according to any one of claims 1 to 4, CHARACTERIZED by the fact that abrasive particles are adhered to at least the inner peripheral surface of said braided tube (3).
    [6]
    6. Method of anchoring one end of a fiber-reinforced plastic filament body, CHARACTERIZED by the fact that it comprises:
    cover a terminal part of a fiber-reinforced plastic filament body (1) with a friction sheet (2) showing flexibility and having abrasive particles (2a) adhered to the top and bottom surfaces thereof, additionally cover the friction sheet ( 2) from the top with a braided tube (3) obtained by braiding a metal wire, surrounding by a wedge (5) the part covered with said friction sheet (2) and said braided tube (3) , and fix this part inside a final socket (4).
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    同族专利:
    公开号 | 公开日
    EP2466003A1|2012-06-20|
    EP2466003A4|2014-10-08|
    CN102482845B|2014-11-12|
    US20120141198A1|2012-06-07|
    JPWO2011019075A1|2013-01-17|
    CA2769575A1|2011-02-17|
    CN102482845A|2012-05-30|
    EP2466003B1|2018-10-03|
    CA2769575C|2014-03-25|
    BR112012002984A2|2016-04-19|
    WO2011019075A1|2011-02-17|
    JP5426678B2|2014-02-26|
    US8425143B2|2013-04-23|
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    法律状态:
    2018-04-10| B06F| Objections, documents and/or translations needed after an examination request according art. 34 industrial property law|
    2019-02-05| B06T| Formal requirements before examination|
    2019-10-15| B16A| Patent or certificate of addition of invention granted|Free format text: PRAZO DE VALIDADE: 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/08/2010, OBSERVADAS AS CONDICOES LEGAIS. (CO) 20 (VINTE) ANOS CONTADOS A PARTIR DE 06/08/2010, OBSERVADAS AS CONDICOES LEGAIS |
    优先权:
    申请号 | 申请日 | 专利标题
    JP2009-186947|2009-08-12|
    JP2009186947|2009-08-12|
    PCT/JP2010/063731|WO2011019075A1|2009-08-12|2010-08-06|Structure and method for affixing terminal of linear body made of fiber reinforced plastic|
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