Wire rope fastening fittings

Abstract

To provide a wire rope fastening metal fixture which can exert high-holding efficiency in the terminal processing of a wire rope, and can bring about efficiency and sureness at construction, and easiness and clarity of construction management.SOLUTION: A receiving metal fixture 10 for receiving a superimposed portion of a wire rope 50 is formed into an inverted T-shape which is formed by connecting L-shaped plates each having a bottom part 11b orthogonal to a protrusion 11a for pushing up the wire rope to each other back to back. On the hand, a covering metal fixture 20 for crimping the superimposed portion of the wire rope 50 is formed into the inverted T-shape having a sidewall part clearance S which is formed by connecting L-shaped plates each having a bottom part 21b orthogonal to a sidewall part 21a to each other back to back via a fixing pin 22. When the bottom part 11b of the receiving metal fixture 10 and the bottom part 21b of the covering metal fixture 20 are adhesively fastened to each other, a clearance distance between the two fixing pins 22, 22 and a lower flat part of the protrusion 11a is set so as to be constant value B0. Here, the two fixing pistons 22, 22 are arranged in a form for gripping the protrusion 11a.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a wire rope fastener used in the end processing of a wire rope. [Background technology]

[0002] 2. Description of the Related Art As a means for preventing utility poles, roadside trees, etc. inserted into the ground from tilting or collapsing, guy anchors are widely used in which multiple anchor devices are installed around the supported object and one end of a wire rope acting as a guy is moored to the supported object while the other end is moored to the anchor device so that the tension of the wire rope stably supports the supported object.

[0003] Wire grips are also widely used as a means of gripping the ends of wire ropes (the overlapping parts of the upper and lower wire ropes wound around the supported object). The holding performance, structure, shape, dimensions, manufacturing method, and tensile test of wire grips are specified by JIS B 2809:2018.

[0004] Fig. 6 is an explanatory diagram showing gripping of the end of a wire rope by a conventional wire grip. As shown in Fig. 6, the conventional wire grip is composed of a main body that receives the wire rope, a U-bolt that presses the wire rope against the main body, and a nut that grips the wire rope while screwing with the U-bolt. In order to grip the overlapping portion of the wire rope with a predetermined holding efficiency, multiple wire grips, for example, four wire grips, are required. One U-bolt is screwed with two nuts, so there are a total of eight screw-fastening points between the U-bolt and the nuts at the end of the wire rope.

[0005] Regarding the installation method, the nut must be tightened so that the shorter end of the wire rope (the wire rope with the free end) is positioned on the arc side of the U-bolt, and the longer end of the wire rope (the wire rope directly connected to the anchor device) is positioned on the nut side. Therefore, construction management of the installation interval, installation method, tightening torque, etc. must be performed for each of the four wire grips. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Utility Model Application Publication No. 56-162339 [Patent Document 2] JP 2014-98435 A Summary of the Invention [Problem to be solved by the invention]

[0007] In the case of the conventional wire grips mentioned above, the anchor device also needs to grip the end of the wire rope with four wire grips, which means that eight wire grips (=4 x 2) are needed for one wire rope, resulting in a total of 16 (=8 x 2) screw fastening points for the U-bolt and nut.

[0008] Thus, in the case of conventional wire rope terminal processing using wire grips, the number of wire grips used increases, resulting in many management items (installation intervals, installation method, loose nuts, etc.). As a result, installation work and management become complicated. As a result, depending on the installer and installation conditions, human error can be induced, making it difficult to ensure the wire grip's gripping performance.

[0009] In addition, in recent years, there has been an increase in the use of coated (PVC, etc.) wire ropes for wire ropes used to prevent the collapse of soundproofing walls and protective fences on expressways, and to prevent transplanted trees from collapsing, due to issues with weather resistance.

[0010] " Therefore, the present invention has been made in consideration of the problems of the above-mentioned conventional technology, and its object is to provide a wire rope fastener which exhibits high holding efficiency in the terminal processing of wire ropes, while also improving efficiency and reliability of installation and making installation management simple and clear, and which can also be applied to insulated wire ropes. [Means for solving the problem]

[0011] In order to achieve the above-mentioned object, the wire rope fastening device of the present invention is a wire rope fastening device 100 comprising a receiving device (10) that receives the overlapping portion of the wire rope (50), a covering device (20) that is placed over the receiving device (10) and fastened to form a gap distance (B0) smaller than twice the outer diameter of the wire rope (50) at at least two locations between the receiving device (10) and the covering device (20), and fasteners (30, 40) that fasten the receiving device (10) and the covering device (20), characterized in that the receiving device (10) has a convex portion (11a) that protrudes in a convex shape into the overlapping portion of the wire rope (50) that is sandwiched between the two gap distances (B0).

[0012] In the above configuration, the overlapping portion of the wire rope (50) sandwiched between the gap distances (B0) is pushed up into a convex shape by the convex portions (11a). When a tensile load acts on the overlapping portion of the wire rope (50) pushed up into a convex shape, a restoring force is generated that causes the wire rope (50U) to return from the convex shape to a straight shape. This restoring force acts on the overlapping portion of the wire rope (50) in the opposite direction to the pushing direction by the convex portions (11a). As a result, this restoring force acts on the overlapping portion of the wire rope (50) as a fastening force (second grip). Note that this fastening force has a characteristic that it increases as the tensile load acting on the wire rope (50U) increases.

[0013] In this way, the overlapping portion of the wire rope (50) is gripped with a constant fastening force due to the gap distance (B0) (first grip), and is also gripped by the second grip where the fastening force sandwiched between the two first grips increases in proportion to the tensile load, so it becomes possible to consolidate the multiple wire grips that were previously required into a single wire rope fastening fixture. By consolidating the number of wire rope fastening fixtures used into a single fixture, construction work can be performed efficiently and reliably, and construction management can also be performed simply and clearly.

[0014] A second feature of the wire rope fastening device according to the present invention is that the covering device (20) has two side walls (21a) that suppress lateral deformation of the wire rope (50).

[0015] In the above configuration, the fastening force of the first grip and the fastening force of the second grip are efficiently applied to the overlapping portion of the wire rope (50) by the two side walls (21a). This generates strong friction in the overlapping portion of the wire rope (50), and the holding efficiency of the wire rope fastening fitting 100 is further improved.

[0016] A third feature of the wire rope fastening device of the present invention is that the receiving device (10) has a first flat portion (11b) perpendicular to the convex portion (11a) and the cover device (20) has a second flat portion (21b) perpendicular to the side wall portion (21a), and the first flat portion (11b) and the second flat portion (21b) are stacked in close contact with each other, thereby forming the gap distance (B0).

[0017] In the above configuration, it is possible to control the state of the first grip by visually checking whether there is a gap between the first flat portion (11b) and the second flat portion (21b). In other words, it is not necessary to control the tightening torque for screw fastening. This makes it possible to simplify and clarify the construction control of the wire rope fastening device 100.

[0018] A fourth feature of the wire rope fastening device according to the present invention is that the surface of the convex portion (11a) that comes into contact with the overlapping portion of the wire rope (50) is subjected to a treatment to reduce surface roughness.

[0019] In the above-described configuration, strong friction occurs at the contact surfaces (S3, S4, S6) between the wire rope (50) and the protrusions (11a), thereby improving the retention efficiency of the wire rope fastening fitting. Effect of the Invention

[0020] According to the wire rope fastening device (100) of the present invention, the overlapping portion (terminal portion) of the wire rope is held by the first grip, which generates a fastening force due to the gap distance (B0) between the receiving device (10) and the covering device (20), and the second grip, which generates a fastening force when a tensile load acts on the wire rope (50) that is pushed up in a convex shape and sandwiched between the first grip. As a result, strong friction occurs at the overlapping portion with the wire rope (50) and at the contact portion between the wire rope (50) and the receiving device (10), and this wire rope fastening device exhibits high holding efficiency. As a result, it is possible to consolidate the number of wire rope fastening devices used in the end processing of the wire rope into one, thereby improving the efficiency of the construction work.

[0021] In addition, the first flat portion (11b) of the receiving tool (10) and the second flat portion (21b) of the covering tool (20) are in close contact with each other and fastened by the fasteners (30, 40), so that the gap distance between the receiving tool (10) and the covering tool (20) is kept constant (B0), thereby exerting the first grip. As a result, the confirmation work of whether the first grip is exerted or not can be performed only by visually confirming that the first flat portion (11b) and the second flat portion (21b) are in close contact with each other (no gap is generated). This makes it unnecessary to manage the tightening torque of the fasteners (30, 40) in the first grip, and simplifies the confirmation work in the first grip. This makes it possible to reduce human error.

[0022] The second grip is a mechanism that generates a fastening force by a restoring force that causes the convex wire rope (50) to return to a straight shape when a tensile load acts on the wire rope (50). Therefore, after the wire rope fastening fitting is attached to the wire rope (50), no particular management of the construction of the second grip is required. As a result, in combination with the simplification of the confirmation work in the first grip, the management of the construction of the terminal treatment of the wire rope (50) can be simplified and clarified.

[0023] Furthermore, since the wire rope fastening device of the present invention has high holding efficiency due to the first grip and the second grip, it is possible to securely hold even an insulated wire rope.

[0024] Furthermore, by optimizing the mechanism by which the secondary gripping effect is exerted, it is possible to reduce the size and weight of the fastening fitting.

[0025] Furthermore, by making the fastening metal fittings smaller and lighter, it is possible to improve workability and transportability and reduce costs. [Brief description of the drawings]

[0026] [Figure 1] FIG. 1 is an explanatory diagram showing a wire rope fastening fitting according to an embodiment of the present invention. [Diagram 2] FIG. 4 is an explanatory diagram showing a receiving fitting according to the present invention. [Diagram 3] FIG. 2 is an explanatory diagram showing a metal cap according to the present invention. [Figure 4] FIG. 2 is an explanatory diagram showing a mechanism for generating each fastening force for the first grip and the second grip of the present invention on the overlapping portion of the wire rope. [Diagram 5] 5 is an explanatory diagram showing the relative positional relationship between two fixing pins and a protrusion, and the shape of the protrusion. FIG. [Figure 6] FIG. 1 is an explanatory diagram showing gripping of an end portion of a wire rope by a conventional wire grip. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0027] Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0028] Fig. 1 is an explanatory diagram showing a wire rope fastening device 100 according to one embodiment of the present invention. Fig. 1(a) is a front view of the wire rope fastening device 100, and Fig. 1(b) is a plan view of the wire rope fastening device 100. For convenience of explanation, the wire rope 50 and the supported object 60 are omitted in Fig. 1(b).

[0029] The wire rope fastening device 100 is a fastening device (gripping tool) for fastening the end portion (an overlapping portion of the upper wire rope 50U and the lower wire rope 50L wound around the supported object 60, hereinafter also referred to as the "overlapping portion of the wire rope 50") of the wire rope 50 (stay) which prevents the tilting and collapse of the supported object 60 (e.g., utility pole or street tree), and has high retention efficiency. The "retention efficiency" quantitatively means a percentage (=BL* / BL0×100) of the breaking load BL* obtained by performing a tensile test on the wire rope whose end portion is fastened by the wire rope fastening device 100 of the present invention, and dividing the breaking load BL* obtained by the tensile test by the specified breaking load BL0 for the wire rope unit guaranteed by the manufacturer. The breaking load BL* in the tensile test is calculated by subtracting four times the standard deviation (σ) from the average value (BLm) of the actual breaking loads of multiple test specimens (BLm-4σ). Incidentally, the wire rope fastener 100 of the present invention exhibits a high retention efficiency of 80% or more with just one unit for the wire rope 50 conforming to standards 9-11 and 10-12.

[0030] Therefore, while conventional wire grips required multiple wire grips to achieve a predetermined holding efficiency (e.g., 80% or more), the wire rope fastening device 100 of the present invention is configured so that a predetermined holding efficiency (e.g., 80% or more) can be achieved with only one wire grip. The configuration of the wire rope fastening device 100 of the present invention will be described below.

[0031] As shown in FIG. 1(a), the wire rope fastening fitting 100 of the present invention is configured to include a receiving fitting 10 having a convex portion 11a that pushes up (raises) the wire rope 50 in a convex shape, a cover fitting 20 having two fixing pins 22, 22 that crimp the wire rope 50 to the receiving fitting 10, and a bolt 30 and a nut 40 that fasten the receiving fitting 10 and the cover fitting 20 together.

[0032] 1(b), the receiving metal fitting 10 has an inverted T shape in which two L-shaped plates are directly connected back to back as viewed from the side. On the other hand, the cover metal fitting 20 has an inverted T shape with a gap in which two L-shaped plates are connected back to back via a fixing pin 22 as viewed from the side. The protrusion 11a of the receiving metal fitting 10 fits into the side wall gap S of the cover tool 20 (the gap between the side wall portions 21a and 21a), and the bottom portion 11b of the receiving metal fitting 10 is configured to be in close contact with the bottom portion 21b of the cover metal fitting 20 so that they can be stacked.

[0033] Therefore, when the bottom 11b of the receiving metal fitting 10 is stacked closely against the bottom 21b of the cover metal fitting 20, the gap distance B between the fixing pin 22 and the lower flat portion of the protrusion 11a becomes a constant value (B0). As a result, the overlapping portion of the wire rope 50 is crimped between the fixing pin 22 and the lower flat portion of the protrusion 11a and is gripped with a predetermined fastening force (first grip). The first grip occurs at two points centered on the fixing pin 22. On the other hand, the overlapping portion of the wire rope 50 sandwiched between the first grips is pushed up in a convex shape by the trapezoidal portion of the protrusion 11a of the receiving metal fitting 10.

[0034] When a tensile load acts on the overlapping portion of the wire rope 50 pushed up in a convex shape, a restoring force is generated that tries to return the wire rope 50 from the convex shape to a straight shape. As a result, the overlapping portion of the wire rope 50 sandwiched between the first grips is held by a fastening force resulting from this restoring force (second grip). The fastening force of the second grip has a characteristic that increases as the tensile load acting on the upper wire rope 50U increases. Details of the first grip and the second grip will be described later with reference to FIG. 4. In addition, the "upper wire rope 50U" here means the wire rope 50 whose other end is connected to an anchor device, and similarly, the "lower wire rope 50L" means the wire rope 50 whose other end is a free end, and does not mean a vertical positional relationship.

[0035] Also, it is desirable to place a washer between the bolt 30 and the bottom 11b of the receiving metal fitting 10, but this is not essential.

[0036] In order to prevent the nuts 40 from loosening, it is desirable to use, for example, a self-locking nut. Alternatively, it is possible to use a so-called double nut in which two nuts 40 are screwed onto the bolt 30 and the inner nut 40 is returned in a slightly loosening direction so that the inner and outer nuts 40, 40 press against each other in the axial direction, preventing the nuts 40, 40 from easily loosening. Each configuration will be further described below.

[0037] Fig. 2 is an explanatory diagram showing a receiving fitting 10 according to the present invention. Fig. 2(a) is a plan view of the receiving fitting 10, Fig. 2(b) is a front view of the receiving fitting 10, and Fig. 2(c) is a right side view of the receiving fitting 10.

[0038] As shown in Fig. 2(c), the receiving bracket 10 is formed by integrating L-shaped plates 11 back to back, each plate consisting of a convex portion 11a, a flat bottom portion 11b perpendicular to the convex portion 11a, and an R portion 11c smoothly connecting the convex portion 11a and the bottom portion 11b, forming an inverted T-shape as a whole. The two L-shaped plates 11, 11 can be joined by welding or fasteners, for example. Note that the receiving bracket 10 can also be an integral structure instead of the two-piece structure of the L-shaped plate 11.

[0039] 2(a), the bottom 11b is formed, for example, in a semicircular shape. The bottom 11b may have any planar shape as long as it is formed flat perpendicular to the protrusion 11a. The bottom 11b is also formed with a through hole 11b1 for passing the bolt 30 therethrough.

[0040] As shown in Fig. 2(b), the convex portion 11a is composed of a lower left flat portion 11a1, a left oblique portion 11a2, an upper flat portion 11a3, a right oblique portion 11a4, and a lower right flat portion 11a5. The left oblique portion 11a2, the upper flat portion 11a3, and the right oblique portion 11a4 may also be referred to as "trapezoidal portions." The lower left flat portion 11a1 and the lower right flat portion 11a5 may also be referred to as "lower flat portions."

[0041] The dimensions of the left oblique side portion 11a2, the upper flat portion 11a3, and the right oblique side portion 11a4 are determined so that no gap is generated between the wire rope 50 and the trapezoidal portion of the protrusion 11a when the bottom portion 11b of the receiving metal fitting 10 and the bottom portion 21b of the cover metal fitting 20 are stacked in close contact with each other. This will be described later with reference to FIG.

[0042] In addition, each corner of the lower left flat portion 11a1 and the lower right flat portion 11a5 is rounded or chamfered so as not to damage the wire rope 50 when the first grip or the second grip is exerted.

[0043] 2(a), it is preferable that the surfaces of the protrusion 11a that come into contact with the wire rope 50, such as the upper flat portion 11a3 and the left and right oblique sides 11a2, 11a4, have a mechanism for suppressing slippage of the wire rope 50, such as a rough surface structure. The lower left flat portion 11a1 and the lower right flat portion 11a5 may also have a rough surface structure.

[0044] Fig. 3 is an explanatory diagram showing a cover metal fitting 20 according to the present invention. Fig. 3(a) is a plan view of the cover metal fitting 20, Fig. 3(b) is a front view of the cover metal fitting 20, and Fig. 3(c) is a right side view of the cover metal fitting 20.

[0045] 3(c), the metal cover 20 has L-shaped plates 21 each consisting of a rectangular side wall 21a, a bottom 21b formed flat and perpendicular to the side wall 21a, and an R-section 21c smoothly connecting the side wall 21a and the bottom 21b, which are joined together back-to-back by two fixing pins 22, 22 to form an inverted T-shape with a gap. The fixing pin 22 and the side wall 21a can be joined by welding, for example.

[0046] Further, a through hole 21a1 into which the reduced diameter portion of the fixing pin 22 is inserted is formed in the side wall portion 21a.

[0047] 3(a), the bottom portion 21b is formed, for example, in a semicircular shape. The bottom portion 21b may have any planar shape as long as it is formed in a flat shape perpendicular to the side wall portion 21a. The bottom portion 21b is also formed with a through hole 21b1 for passing the bolt 30 therethrough.

[0048] The two side walls 21a, 21a are arranged parallel to each other. The two side walls 21a, 21a suppress the lateral deformation of the wire rope 50, so that the fastening force of the first grip and the fastening force of the second grip are effectively applied to the wire rope 50.

[0049] The protrusion 11a of the receiving metal fitting 10 fits into the side wall gap S between the side wall portions 21a. The bottom portion 11b of the receiving metal fitting 10 is stacked in close contact with the bottom portion 21b.

[0050] 3(b), the side wall portion 21a is, for example, rectangular in shape. Note that the side wall portion 21a may have any shape as long as it is perpendicular to the bottom portion 21b and can fix the fixing pin 22.

[0051] Fig. 4 is an explanatory diagram showing a mechanism for generating each fastening force for the first grip and the second grip on the overlapping portion of the wire rope 50 according to the present invention. Fig. 4(a) shows a state in which the overlapping portion of the wire rope 50 is passed between the side wall portions 21a of the cover fitting 20. Fig. 4(b) shows a state in which the first grip is exerted on the overlapping portion of the wire rope 50. Fig. 4(c) shows a state in which the second grip is exerted on the overlapping portion of the wire rope 50.

[0052] 4(a), first, the overlapping portion of the wire rope 50 moored to the supported object 60 is passed, for example, between the side walls 21a of the cover fitting 20 (side wall gap S). Next, the trapezoidal portion of the convex portion 11a of the receiving fitting 10 is passed between the side walls 21a of the cover fitting 20 (side wall gap S) and between the fixing pin 22. The receiving fitting 10 and the cover fitting 20 can be positioned so that the bolt 30 passes through the through hole 11b1 of the receiving fitting 10 (FIG. 2) and the through hole 21b1 of the cover fitting 20 (FIG. 3).

[0053] After the nut 40 is screwed onto the bolt 30, the bolt 30 is rotated while fixing the nut 40, thereby screwing the bottom 21b of the cover fitting 20 and the bottom 11b of the receiving fitting 10 together. By rotating the bolt 30, the gap distance G between the bottom 21b of the cover fitting 20 and the bottom 11b of the receiving fitting 10 becomes smaller. At the same time, the trapezoidal portion of the convex portion 11a pushes the overlapping portion of the wire rope 50 upward in a convex shape.

[0054] 4(b), when the bottom 21b of the cover fitting 20 is stacked in close contact with the bottom 11b of the receiving fitting 10 and the gap distance G between the bottom 21b of the cover fitting 20 and the bottom 11b of the receiving fitting 10 becomes zero, the gap distance B between the fixing pin 22 and the lower flat parts 11a1, 11a5 of the protrusion 11a becomes the minimum value B0. In this case, the overlapping part of the wire rope 50 moored to the supported object 60 is sandwiched between the two side walls 21a, 21a of the cover fitting 20 and is crimped at two points by the two fixing pins 22, 22 and the lower flat parts 11a1, 11a5 of the protrusion 11a.

[0055] As a result, the overlapping portion of the wire rope 50 is gripped (first grip) with a fastening force F1 corresponding to the gap distance B0 between the fixing pin 22 and the lower flat portions 11a1, 11a5 of the protrusion 11a. As a result, strong friction is generated at the overlapping portions S1, S2 of the upper wire rope 50U and the lower wire rope 50L, thereby suppressing the relative displacement between the upper wire rope 50U and the lower wire rope 50L.

[0056] Similarly, strong friction occurs at overlapping portions S3, S4 between the lower wire rope 50L and the lower flat portions 11a1, 11a5 of the protrusion 11a, which suppresses the relative displacement of the lower wire rope 50L with respect to the protrusion 11a (receiving metal fitting 10). As a result, the overlapping portions of the wire rope 50 are held stationary with respect to the receiving metal fitting 10 and the cover metal fitting 20 by the fastening forces F1, F1 by the two first grips.

[0057] As shown in FIG. 4(c), when the overlapping portion of the wire rope 50 sandwiched between the two first grips (fixing pins 22, 22), particularly the upper wire rope 50U, is viewed, when a tensile load F2 acts toward the anchor device, the tensile load F2 acts in the direction of the supported object 60 as a reaction force, and the tensile load F2 acts on the upper wire rope 50U in the left-right direction of the figure. As a result, a restoring force F3 that tries to return the upper wire rope 50U from a convex shape to a straight shape is generated. This restoring force F3 acts to press the overlapping portion of the wire rope 50 sandwiched between the two first grips (fixing pins 22, 22) against the convex portion 11a of the receiving bracket 10. As a result, the overlapping portion of the wire rope 50 sandwiched between the two first grips (fixing pins 22, 22) is held (second grip) by a fastening force F3 corresponding to the tensile load F2 acting on the upper wire rope 50U. As a result, strong friction occurs at overlapping portion S5 between upper wire rope 50U and lower wire rope 50L, thereby suppressing relative displacement between upper wire rope 50U and lower wire rope 50L.

[0058] Similarly, strong friction occurs at an overlapping portion S6 between the lower wire rope 50L and the trapezoidal portion of the convex portion 11a, thereby suppressing the relative displacement of the lower wire rope 50L with respect to the convex portion 11a (receiving metal fitting 10).

[0059] In this way, in order for the fastening force F3 associated with the second grip to be exerted, it is necessary that the fastening force F1 associated with the first grip is exerted, the overlapping portion of the wire rope 50 sandwiched between the two first grips (fixing pins 22, 22) is pushed up in a convex shape, and further that a tensile load F2 is acting on the upper wire rope 50U. Note that the fastening force F3 associated with the second grip has a characteristic that it increases as the tensile load F2 acting on the upper wire rope 50U increases.

[0060] In summary, in order to exert the fastening force F1 related to the first grip, it is necessary to appropriately secure the gap distance B0 between the two fixing pins 22, 22 and the protruding portion 11a (the lower flat portions 11a1, 11a5). In addition, it is necessary to appropriately secure the overlapping portions S1, S2, S3, S4 of the wire rope 50, which exhibit strong friction.

[0061] On the other hand, in order to exert the fastening force F3 related to the second grip, it is necessary to appropriately secure the overlapping portion S5 between the upper wire rope 50U and the lower wire rope 50L sandwiched between the two fixing pins 22, 22 (two first grips) and the overlapping portion S6 between the lower wire rope 50L and the trapezoidal portion of the protrusion 11a. The relative positional relationship between the two fixing pins 22, 22 and the protrusion 11a and the shape of the protrusion 11a for securing the overlapping portions S1, S2, S3, S4, S5, and S6 of the wire rope 50 will be described below.

[0062] FIG. 5 is an explanatory diagram showing the relative positional relationship between the two fixing pins 22, 22 and the protrusion 11a, as well as the shape of the protrusion 11a. The dimension A represents the center distance between the two fixing pins 22, 22. Since the width W of the side wall portion 21a of the metal cover 20 is constant, when the dimension A is increased, it is possible to ensure a large width of the trapezoidal portion (left oblique side portion 11a2, upper flat portion 11a3, right oblique side portion 11a4) of the protrusion 11a relating to the second grip. On the other hand, when the dimension A is decreased, the width of the trapezoidal portion of the protrusion 11a relating to the second grip becomes smaller.

[0063] The B0 dimension represents the gap distance between the two fixing pins 22, 22 and the left and right lower flat portions 11a1, 11a5. When the B0 dimension is shorter, the crushing ratio of the wire rope 50 (=diameter of the wire rope 50×2 / BO) increases, so the fastening force F1 for the first grip increases. On the other hand, when the B0 dimension is longer, the crushing ratio of the wire rope 50 decreases, so the fastening force F1 for the first grip decreases.

[0064] Dimension C represents the horizontal distance between the left end of the left oblique side portion 11a2 and the right end of the right oblique side portion 11a4. Dimension D represents the horizontal distance of the upper flat portion 11a3. Dimension E represents the vertical distance between the left and right oblique sides 11a2, 11a4. That is, dimensions C, D, and E define the dimensions related to the trapezoidal portion of the convex portion 11a relating to the second grip. That is, dimension C can be seen as defining the length of the upper base of the trapezoidal portion of the convex portion 11a. Also, dimension D can be seen as defining the length of the upper base of the trapezoidal portion. Furthermore, dimension E can be seen as defining the height of the trapezoidal portion. Incidentally, the inclination angle θ of the oblique side portion is calculated as follows. [Number 1]: θ = tan-1(2E / (CD)) Furthermore, as shown in FIG. 5(b), the gap distance h between the two fixing pins 22, 22 and the oblique sides 11a2, 11a4 of the protrusion 11a is reduced to the length of the perpendicular line drawn from the point (0, b) to the straight line (Y=tan θ×(Xa)) by setting the "X-axis" to pass through the lower left flat portion 11a1 and the "Y-axis" to pass through the center of the fixing pin 22, and is calculated as follows: [Math 2]:h=a×sinθ+b×cosθ-r Here, a≡(AC) / 2, b≡B0+r, and r≡radius of the body of the fixing pin 22.

[0065] Generally, when the dimension C is large, the trapezoidal portion (left oblique side portion 11a2, upper flat portion 11a3, right oblique side portion 11a4) where the second gripping is exerted can be secured to be large, so that the holding efficiency tends to be high.

[0066] Also, looking at the dimensions A and C, when the dimension C becomes closer to the dimension A (when a in [Equation 2] becomes smaller), the gap distance h between the two fixing pins 22, 22 and the oblique sides 11a2, 11a4 of the convex portion 11a becomes narrower, which tends to increase the crushing rate of the wire rope 50 (diameter of the wire rope 50 x 2 / gap distance h) and improve the holding efficiency.

[0067] However, when the crushing rate in the gap distance h exceeds a certain level, the wire rope 50 is crushed at the core, so that the bolt tightening becomes hard. In other words, when the crushing rate in the gap distance h exceeds a certain level, the workability of the end treatment of the wire rope 50 becomes poor.

[0068] In addition, when the dimension E is large, the trapezoidal portion (left oblique side portion 11a2, upper flat portion 11a3, right oblique side portion 11a4) where the second gripping is exerted becomes larger, and the holding efficiency becomes higher. However, according to the above [Equation 1], when the dimension E is large, the inclination angle θ of the oblique side portion also becomes larger. As a result, the crushing rate at the gap distance h also becomes larger, and the bolt tightening becomes harder.

[0069] Similarly, when the dimension D is large, the overlapping parts S5 and S6 (FIG. 4(c)) of the wire rope 50, which exhibit strong friction, become large, and the retention efficiency tends to become higher. However, when the dimension D is large, the wire rope 50 may be damaged at the overlapping parts S5 and S6 (FIG. 4(c)) of the wire rope 50 due to strong friction.

[0070] In addition, when the dimension D in the above formula 1 becomes larger, the inclination angle θ of the oblique side also becomes larger. As a result, the crushing rate in the gap distance h also becomes larger, so the bolt tightening becomes hard, and the workability of the terminal processing of the wire rope 50 becomes poor.

[0071] As described above, the wire rope fastener 100 of the present invention exhibits high holding efficiency in the terminal processing of wire ropes, while also bringing about efficient and reliable installation work and simple and clear installation management, and is also suitably applicable to insulated wire ropes.

[0072] In particular, the overlapping portion of the wire rope 50 is gripped by a first grip based on the gap distance B0 between the two fixing pins 22, 22 and the left and right lower flat portions 11a1, 11a5, and a second grip based on a fastening force generated when a tensile load acts on the upper wire rope 50U, both ends of which are fastened by the first grip, causing the upper wire rope 50U to return from a convex shape to a straight shape. The fastening force of the second grip has a characteristic that it increases as the tensile load acting on the upper wire rope 50U increases. This makes it possible to grip the overlapping portion of the wire rope 50 with high holding efficiency.

[0073] The wire rope fastener 100 of the present invention has high holding efficiency, so while conventional wire grips require multiple pieces to achieve a certain holding efficiency, the wire rope fastener 100 of the present invention can achieve a certain holding efficiency with just one piece. As a result, the minimum number of fasteners (bolts and nuts) required to grip the overlapping portion of the wire rope 50, two, is sufficient. This makes installation easier and enables the time required for installation to be significantly reduced (improved installation efficiency).

[0074] The first clamping fastening force is generated by ensuring a predetermined gap distance B0 for the gap distance B between the two fixing pins 22, 22 and the left and right lower flat portions 11a1, 11a5. This gap distance B0 corresponds to the gap distance G (FIG. 4(a)) between the bottom 21b of the cover fitting 20 and the bottom 11b of the receiving fitting 10 being zero. Therefore, the construction management of the terminal portion of the wire rope 50 gripped by the wire rope fastening fitting 100 of the present invention can be performed by the gap distance G between the bottom 21b of the cover fitting 20 and the bottom 11b of the receiving fitting 10 being zero. As a result, the management of the tightening torque of the bolt 30 is not required, which simplifies and clarifies the construction management and suppresses human errors (construction reliability).

[0075] Furthermore, the wire rope fastening fixture 100 of the present invention grips the terminal portion of the wire rope 50 with a first grip and a second grip in which the fastening force increases as the tensile load acting on the upper wire rope 50U increases, so that it is possible to suitably grip even the terminal portion of a coated wire rope 50.

[0076] The wire rope fastener 100 according to one embodiment of the present invention has been described above with reference to the drawings, but the embodiment of the present invention is not limited to the above. In other words, various modifications and changes can be made within the technical scope of the present invention. For example, the receiving metal fitting 10 and the cover metal fitting 20 may be made of a plastic material having equal or greater strength and rigidity. Also, three or more fixing pins 22 may be provided instead of two. Explanation of symbols

[0077] 10 Receiving bracket (receiving tool) 11 L-shaped plate 11a Convex part 11b Bottom (1st flat part) 11c R section (arc section) 11a1 Lower left flat area 11a2 Left hypotenuse 11a3 Upper flat part 11a4 Right hypotenuse 11a5 Lower right flat area 11b1 Through hole 20 Covering metal fittings (covering fixtures) 21 L-shaped plate 21a Side wall part 21b Bottom (2nd flat part) 21c R section (arc section) 21a1 Through hole 21b1 Through hole 22 Fixing pin (pin) 30 Volts 40 Nut 50 Wire Rope 50U Upper Wire Rope 50L Lower Wire Rope 60 Supported object 100 Wire rope fastener S Side wall gap G Gap distance between the bottom of the cover and the bottom of the receiving bracket A Center distance between two fixing pins B, B0: Gap distance between the two fixing pins and the left and right lower flat parts C The horizontal distance between the left end of the left hypotenuse and the right end of the right hypotenuse D Horizontal distance of upper flat part E Vertical distance between left and right hypotenuses

Claims

1. A receiving device (10) for receiving an overlapping portion of the wire rope (50); a cover (20) that is covered and fastened to the receiving tool (10) to form a gap distance (B0) between the receiving tool (10) and the cover (20) that is less than twice the outer diameter of the wire rope (50) at at least two locations; A wire rope fastening tool including a fastener (30, 40) for fastening the receiving tool (10) and the covering tool (20), The receiving tool (10) has a convex portion (11a) that pushes up the overlapping portion of the wire rope (50) sandwiched between the two gap distances (B0) in a convex shape. A wire rope fastener characterized by:

2. 2. The wire rope fastener according to claim 1, The cover (20) has two side walls (21a) that suppress lateral deformation of the wire rope (50). A wire rope fastener characterized by:

3. 3. The wire rope fastener according to claim 2, The receiving tool (10) has a first flat portion (11b) perpendicular to the convex portion (11a), and the covering tool (20) has a second flat portion (21b) perpendicular to the side wall portion (21a), The first flat portion (11b) and the second flat portion (21b) are stacked in close contact with each other, so that the gap distance (B0) is formed. A wire rope fastener characterized by:

4. The wire rope fastener according to any one of claims 1 to 3, The surface of the protrusion (11a) that comes into contact with the overlapping portion of the wire rope (50) is subjected to a treatment to make the surface roughness worse. A wire rope fastener characterized by:

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