JP5116741B2 - Rope end fitting and wire rope fixing structure using the end fitting - Google Patents

Description

  The present invention relates to a rope end fitting for fixing a wire rope and a support in a rock fall protection fence, a guard cable, and the like, and a wire rope fixing structure using the rope end fitting, and in particular, a wire rope having a predetermined value or more. When a load is applied, the wire rope is slid out from the cable end bracket and pulled out to prevent breakage of the wire rope and deformation of the column, and to increase the allowable load of the falling rock protection fence, guard cable, etc. It enhances sex.

  A rockfall guard fence that prevents falling rocks from slopes on roads, parking lots, and various buildings, and a guard cable that ensures safety from emergency situations such as vehicle collisions are a combination of multiple wire ropes that work within the elastic region. It consists of struts with moderate rigidity and toughness, and absorbs energy by pulling the wire rope and deforming the struts against the impact of falling rocks and vehicle collisions.

  Conventional rope end fittings fix the end of the wire rope to the column.For example, loosen the end of the wire rope and insert a wedge lump between the strands to make the wire rope into the opening. Secure to the bracket so that it cannot be disconnected. A means for screwing the bracket to a bolt shaft fixed to the column is generally used.

  In addition, the tip of the bolt shaft with the fastening double nut screwed to the base end portion is formed in the annular portion or the hook portion, and the end portion of the wire rope is attached to the annular portion or the hook portion of the bolt shaft fixed to the column. There is also provided a cable end metal fitting to which a winding grip is applied (Patent Document 1). Then, as a processing means for the end portion of the wire rope, a threaded portion is screwed on the outer side of the large diameter of the conical tube, and a concave groove portion that can be engaged with the wire rope matching the inner side of the conical tube is opposed to the vertical direction. There is also provided means comprising a wedge and an edged nut that can be screwed onto the threaded portion of the conical tube (Patent Document 2). Further, there is also provided a cable end fitting for connecting, via a pinching nut, a bolt shaft in which a head portion passing through a winding grip attached to an end portion of a wire rope is fixed to a support column (Patent Document 3).

Utility model registration No. 3029289 JP-A-9-31877 Utility model registration No.3044455

  However, since all the conventional rope end fittings have a configuration in which the end of the wire rope is fixed to the support column, the falling rock or the collision load acts directly on the wire rope when a falling rock occurs or when the vehicle collides. If the load exceeds the allowable load, breakage of the wire rope, deformation of the rope end fittings and support pillars, etc. occur, and the mission as a rockfall protection fence or guard cable cannot be fulfilled. In other words, when the conventional rope end fitting is applied to the wire rope more than the allowable load of the wire rope itself, this energy cannot be absorbed and the wire rope is broken.

  Recently, in response to a fatal accident caused by a falling rock in a parking lot at Mt. Fuji at Miyanomiya Exit in July 2009, there is a strong demand for improving the safety of falling rock guards and guard cables. Even when there is an unexpected large rock fall or collision, it is possible to absorb these energies, and at least prevent the rock fall and the collision vehicle from stopping through the rock fall protection fence and guard cable to ensure safety. Securement is particularly required.

  On the other hand, in order to increase the safety of the rockfall protection fence and guard cable, it is not practical to increase the design value of the allowable load of the wire rope in the rockfall protection fence and guard cable and use a wire rope with a large allowable load. It is difficult to implement in terms of economic efficiency.

  Therefore, the present invention solves the problems of the conventional rope end fitting and the wire rope fixing structure using the rope end fitting as described above, and even when a load exceeding a predetermined value is applied to the wire rope, By sliding it out from the end of the cable end, the load is absorbed to prevent breakage of the wire rope and deformation of the strut, and to allow the falling rock protection fence and guard cable to exceed the allowable load limit of the wire rope itself. It is an object of the present invention to provide a cable end fitting capable of increasing the load and realizing higher safety and a wire rope fixing structure using the rope end fitting.

In order to achieve the object, the present invention provides a cable end for fixing an end of a wire rope to a support so that the wire rope is slid out when a load exceeding a predetermined value is applied to the wire rope. A metal fitting that has a wedge member that can be fixed to the outer peripheral surface of the wire rope, a hollow taper portion that accommodates the wedge member in a non-detachable manner, and an engagement member having a large-diameter engagement collar portion at one end ; A metal fitting body having a hollow cylindrical portion through which a wire rope can be inserted and having a large-diameter screw-shaped flange portion formed by engraving a screw groove on the outer peripheral surface, and an annular opening at one end portion to form a flange portion, the engagement of the inner and joint member having engraved a thread groove on the peripheral surface, Ri Do and a fixing device for fixing a fitting body to the strut, the engagement member to the annular flange portion of the joint member While locking the collar, the screw of the metal fitting body in the screw groove of the joint member Providing Sakutan fitting, characterized by connecting the engaging member and the fitting body as the base by screwing the flange portion.

Further, the wedge member can be divided into a plurality of parts, and the outer peripheral surface is formed in a tapered shape when fixed to the wire rope.

Then, the screw groove is engraved on the other end portion of the gold tool body, by inserting the該螺Ko groove to the column, by screwing a nut as the fastener is secured to the post.

More specifically, when a load of a predetermined value or more is applied to the wire rope, the rope end metal fitting for fixing the end of the wire rope to the support so that the wire rope is slid and fed out, The wedge member fixed to the outer peripheral surface of the wire rope is stored in the hollow taper portion of the engaging member so as not to be detached, and the end of the wire rope extended from the engaging member is inserted into the hollow cylindrical portion of the metal fitting body, A large-diameter engagement collar portion formed at one end of the engagement member and a large-diameter screw-shaped collar portion formed at one end portion of the metal fitting main body and engraved with a screw groove on the outer peripheral surface are opposed to each other. A screw groove carved on the inner peripheral surface of a joint member formed by forming an annular flange for locking the engagement flange of the engagement member in the opening of the engagement portion is screwed with the screw groove of the screw-shaped flange of the metal fitting body. And by engaging the annular flange of the joint member and the engagement flange of the engagement member with each other Providing a cable end bracket that connects the bracket body and the engaging member together, inserts a screw groove formed at the other end of the bracket body into the column, and screws the nut as a fixture to fix it to the column. To do .

  Further, the present invention provides a wire rope fixing structure that uses the rope end fitting having the above-described configuration and uses the rope end fitting to fix the rope end of the wire rope in the rockfall protection fence or guard cable to the support. When the wire rope is slid by a predetermined length against the fixing of the engaging member to the inner peripheral surface by the wedge member due to the load exceeding the predetermined value, when the load exceeding the predetermined value is applied to the wire rope In addition, the structure that prevents the wire rope from breaking and the strut deformation by feeding the wire rope out of the cable end fitting by sliding the wire rope against the fixing of the engaging member to the inner peripheral surface by the wedge member. I will provide a.

  According to the present invention having the above configuration, when a load is applied to the wire rope due to falling rocks or the like, if the load is smaller than the fixing force of the wire rope by the wedge member, the wire rope is The fallen rocks can be supported inside the rockfall guard fence and guard cable. On the other hand, when a load exceeding a predetermined value exceeding the fixing force of the wedge member is applied, the wire rope resists the fixing of the engaging member to the inner peripheral surface by the wedge member, and the wire rope is connected to the wedge member, the engaging member, and the metal fitting. It slides a predetermined length in the body and is fed out from the cable end fitting. At this time, since the end portion of the wire rope is extended into the metal fitting body, the wire rope has a margin for sliding a predetermined length and being drawn out from the cable end fitting. By drawing the wire rope out of the cable end fitting in this way, it is possible to prevent the wire rope from breaking and the support column from being deformed, and it is possible to hold the falling rocks and the like without jumping out from the falling rock protection fence. Similarly, when an automobile or the like collides with the guard cable, the guard cable can be prevented from being damaged, and the vehicle or the like can be prevented from jumping out of the guard cable.

  Therefore, even if you use a wire rope with the same allowable load as the conventional wire rope that is used with the rope end fixed to the column, the allowable load of the falling rock protection fence and guard cable can be improved, making it economical. The safety can be improved without occurring.

The whole front view of the cable end metal fitting concerning this invention. AA sectional drawing of FIG. The assembly explanatory drawing of the cable end metal fitting concerning this invention. The center cross-sectional view of the wedge member concerning this invention. The perspective view of a cable end metal fitting in this invention. The perspective view which shows the use condition of the cable end metal fitting concerning this invention. The front view which shows the use condition of the wire rope concerning this invention.

  Embodiments of a rope end fitting and a wire rope fixing structure using the rope end fitting according to the present invention will be described below with reference to the drawings. FIG. 1 is an overall front view of a cable end fitting according to the present invention, FIG. 2 is a cross-sectional view taken along line AA of FIG. 1, and FIG. In the figure, reference numeral 1 denotes a cable end bracket, which is a bracket for fixing the wire rope 7 to a column 8 such as a terminal column in a falling rock guard or guard cable. In addition, the wire rope 7 in the present invention includes all the cord-like bodies that can be used as PC steel wires and other wire ropes. This rope end fitting 1 can be inserted through a wire member 7, a wedge member 2 that can be fixed to the outer peripheral surface of the wire rope 7, an engagement member 3 that has a hollow taper portion 15 that accommodates the wedge member 2 in a non-detachable manner. It is comprised from the metal fitting body 4 which has the hollow cylindrical part 17, the coupling member 5 which connects the engaging member 3 and the metal fitting main body 4, and the fixing tool 6 for fixing the metal fitting main body 4 to the support | pillar 8 (refer FIG. 6). ing.

  The wedge member 2 has a hollow portion 9, with a large-diameter opening 10 at one end and a small-diameter opening 11 at the other end, and an outer peripheral surface 12 formed in a tapered shape. One or a plurality of slits 13 and 14 are formed from the large-diameter opening 10 toward the small-diameter opening 11 and from the small-diameter opening 11 toward the large-diameter opening 10. (See FIG. 4). The wedge member 2 is configured as a single piece or divided into a plurality of pieces, and is compressed in a state where the wire rope 7 is inserted into the hollow portion 9 at a predetermined position near the end of the wire rope 7. It is fixed to the outer peripheral surface of this with a predetermined pressure. The slits 13 and 14 described above are for facilitating crimping to the wire rope 7. The shape of the wedge member 2 is not limited, and may be any shape as long as the wire rope 7 can be fixed in the hollow tapered portion 15 of the engagement member 3.

  The engaging member 3 has a hollow taper portion 15 having openings at both ends, and the hollow taper portion 15 has an inclined surface that substantially matches the tapered outer peripheral surface 12 of the wedge member 2. . An annular stop portion 3 a is formed on the end surface of the hollow taper portion 15 on the smaller diameter side. Therefore, the wire rope 7 with the wedge member 2 fixed to the outer peripheral surface is inserted into the hollow tapered portion 15 of the engaging member 3 and the wedge member 2 is accommodated in the hollow tapered portion 15, or the wire rope 7 is The wedge member 2 is fixed and accommodated in the hollow tapered portion 15 after being inserted into the hollow portion 15, so that the wedge member 2 is hollow tapered in a state where the small-diameter opening 11 of the wedge member 2 is locked to the annular stop portion 3 a. The portion 15 is accommodated in the engagement member 3 so as not to be detached in the direction of small diameter (arrow X direction). Therefore, the wire rope 7 is fixed to the engagement member 3. In addition, an engagement flange portion 16 having a large diameter for engaging with the joint member 5 is formed at one end portion of the engagement member 3 in the direction opposite to the small diameter direction (arrow X direction) of the hollow taper portion 15. Yes.

  At this time, it is important that the allowable load (fixing force) of the wedge member 2 by the wedge member 2 in the hollow tapered portion 15 of the engaging member 3 is designed to be smaller than the allowable load of the wire rope 7 itself. That is, the allowable load (fixing force) of the wedge member 2 <the allowable load of the wire rope 7 is set. Thus, when a load greater than a predetermined value acts on the wire rope 7 due to falling rocks or the like, a load greater than the allowable load (fixing force) of the wedge member 2 is applied before a load greater than the allowable load of the wire rope 7 is applied. In this case, the wire rope 7 slides against the fixation by the wedge member 2 and is drawn out from the wedge member 2, so that the wire rope 7 is cut or a load of a predetermined value or more acts directly on the support column, It is possible to prevent the support column from being deformed or collapsed. Specifically, the allowable load (fixing force) of the wedge member 2 may be set to a kinetic energy of about 50 kj. Therefore, when a load of kinetic energy of 50 kj or more is applied to the wire rope 7, the wire rope 7 starts to slide against the fixation by the wedge member 2. The allowable load (fixing force) of the wedge member 2 may be set freely according to the purpose and the allowable load of the wire rope 7 itself. Further, if the load applied to the wire rope 7 is smaller than the fixing force by the wedge member 2, the wire rope 7 can support falling rocks and the like causing the load without being fed out from the wedge member 2.

  The metal fitting body 4 is a rod-shaped body having a predetermined length, and has a hollow cylindrical portion 17 having openings at both ends and allowing the wire rope 7 to be slidably inserted. The metal fitting body 4 is formed with a large-diameter screw-shaped flange portion 19 formed by carving a screw groove 18 for engaging with the joint member 5 at one end portion, and the other end portion at the outer peripheral surface. A screw-shaped end portion 21 is provided with a screw groove 20 formed therein. The screw-like end portion 21 is inserted into a hole formed in the support column 8 and screwed with an appropriate fixing tool 6 such as a nut, whereby the screw end portion 21 can be fixed to the support column 8. The screw-like collar portion 19 has substantially the same diameter as the engagement collar portion 16 of the engagement member 3. By inserting the end of the wire rope 7 into the hollow cylindrical portion 17 of the metal fitting body 4 and extending the wire rope 7, the wire rope 7 has a margin enough to slide out of the cable end fitting 1 by sliding a predetermined length. Have.

  The joint member 5 is a cylindrical body having a hollow portion 22 having openings at both ends, and a screw groove 23 that is screwed with the screw-like flange portion 19 of the metal fitting body 4 is formed on the inner peripheral surface. At the same time, an annular flange 24 for locking the engagement flange 16 of the engagement member 3 is formed in the opening at one end.

  Next, the usage method of the cable end metal fitting 1 of the said structure is demonstrated. First, in a rockfall protection fence, a guard cable, or the like, the end of the wire rope 7 for fixing to the support column 8 is positioned on the hollow taper portion 15 of the engagement member 3, and the engagement flange 16 is positioned on the end side of the wire rope 7. Insert as you do. Next, the wedge member 2 is crimped and fixed to the outer peripheral surface of the wire rope 7, and then the tapered outer peripheral surface 12 of the wedge member 2 is brought into pressure contact with the hollow tapered portion 15 of the engaging member 3. It is housed in the engagement member 3 so as not to be detached in the direction of the arrow X (the direction opposite to the engagement flange 16). At this time, the engaging member 3 is inserted into the hollow portion 22 of the joint member 5 in advance, and the engaging flange portion 16 is locked to the annular flange portion 24 of the joint member 5. Alternatively, the wire rope 7 with the wedge member 2 fixed to the outer peripheral surface may be inserted into the hollow tapered portion 15 of the engaging member 3 so that the wedge member 2 is accommodated in the hollow tapered portion 15. If necessary, each member may be in the positional relationship shown in FIG.

  In this state, the end portion of the wire rope 7 extended from the engagement member 3 is inserted into the hollow cylindrical portion 17 of the metal fitting body 4, and the screw-like flange portion 19 of the metal fitting body 4 is engaged with the engagement member 3. By engaging the screw groove 23 of the joint member 5 and the screw groove 18 of the screw-like flange portion 19 of the metal fitting body 4 so as to face the flange portion 16, the engagement member 3 and the metal fitting body 4 are integrally connected. Can do.

  6 and 7, a hole (not shown) is formed at a predetermined position of the support column 8 of the rockfall protection fence 25, and the screw-like end portion 21 of the metal fitting body is inserted into the hole, and the nut is inserted. The wire rope 7 can be fixed to the column 8 using the cable end fitting 1 by screwing with an appropriate fixing tool 6 such as the above. 6 and 7, the support column 8 is illustrated as a rope end support column. However, the support column 8 can be used as it is when it is fixed to another intermediate support column. It is also possible to lay a wire mesh using the wire rope 7. Reference numeral 26 denotes a support material for assisting the support column 8.

  When the load is applied to the wire rope 7 due to falling rocks or the like in the above-described use state, the wire rope 7 is moved by the wedge member 2 to the inner periphery of the engagement member 3 if the load is smaller than the fixing force of the wedge member 2. The state fixed to the surface can be maintained, and falling rocks can be supported inside the falling rock protection fence 25. On the other hand, when a load greater than a predetermined value exceeding the allowable load of the fixing force of the wedge member 2 is applied, the wire rope 7 is connected to the inner periphery of the engaging member 3 by the wedge member 2 before the wire rope 7 is cut. The wire rope 7 slides a predetermined length in the direction of the arrow X in the wedge member 2, the engaging member 3 and the metal fitting body 4 against the fixing to the surface and is fed out from the cable end fitting 1. At this time, since the end portion of the wire rope 7 is extended into the hollow cylindrical portion 17 of the metal fitting body 4, the wire rope 7 has a margin enough to slide out from the cable end fitting 1 by sliding a predetermined length. . Thus, by pulling out the wire rope 7 from the cable end fitting 1, it is possible to prevent the wire rope 7 from being broken and the support column 8 from being deformed.

  As an example, a rockfall protection fence having a height of 1.5 m and a length of 9 m, in which five wire ropes are arranged at equal intervals in the height direction using the rope end fitting 1 according to the present invention and a wire mesh is laid. Manufactured. In addition, as a conventional example, a rock fall protection fence similar to the example was manufactured using a conventional rope end fitting that fixes the rope end of the wire rope. With respect to these rockfall protection fences, an experiment was conducted in which a spherical concrete block having a mass of 2 tons was collided at a speed of 10 m / second (36 km / hour) and a kinetic energy of 100 kj. Generally, the energy that can be absorbed by the rockfall guard fence is 55 kj, so the impact energy that has been tested is approximately twice that.

  In the rock fall protection fence using the conventional rope end bracket, the rope end bracket is deformed, the wire rope is detached from the rope end fitting, or the wire rope is broken, and the concrete block jumps out of the rock fall protection fence. Did not work as. On the other hand, in the rock fall protection fence using the rope end fitting according to the present invention, the shape of the rope end fitting was not changed, and the wire rope was slightly fed out, and the concrete lump could be stopped. This is because the load applied to the wire rope is prevented from being applied to the wire rope by controlling and adjusting the load applied to the wire rope by the cable end fitting.

  According to the present invention described above, when a load exceeding a predetermined value is applied to the wire rope in a rockfall guard fence, a guard cable, or the like, the wire rope is slid out from the cable end fitting and fed out. In addition to preventing breakage and deformation of the column, safety can be improved by increasing the allowable load such as a rockfall guard fence or guard cable. That is, when a load of a predetermined value or more exceeding the fixing force of the wire rope is applied, the wire rope is slid from the engaging member by a predetermined length against the fixing of the engaging member to the inner peripheral surface by the wedge member. It is moved out. By drawing out the wire rope in this way, it is possible to prevent breakage of the wire rope and deformation of the support column, and it is possible to hold rock fall or the like without jumping out from the rock fall protection fence. Therefore, even if a wire rope with the same allowable load as the wire rope used with the conventional rope end fixed to the column is used, the allowable load of the falling rock protection fence and guard cable can be increased, which is economical. The safety can be improved without occurring.

DESCRIPTION OF SYMBOLS 1 ... Rope end fitting 2 ... Wedge member 3 ... Engagement member 3a ... Ring stop part 4 ... Metal fitting body 5 ... Joint member 6 ... Fixing tool 7 ... Wire rope 8 ... Strut 9,22 ... Hollow part 10,11 ... Opening part DESCRIPTION OF SYMBOLS 12 ... Outer peripheral surface 13, 14 ... Slit 15 ... Hollow taper part 16 ... Engagement flange part 17 ... Hollow cylindrical part 18, 20, 23 ... Screw groove 19 ... Screw-like collar part 21 ... Screw-like edge part 24 ... Ring-shaped collar Part 25 ... Falling rock guard 26 ... Support material

Claims (7)

A cable end fitting for fixing the end of the wire rope to the support so that the wire rope is slid out when a load of a predetermined value or more is applied to the wire rope ,
The wire rope is inserted through an engagement member having a wedge member that can be fixed to the outer peripheral surface of the wire rope, a hollow taper portion that accommodates the wedge member in a non-detachable manner, and an engagement flange portion having a large diameter at one end. A metal fitting body having a hollow cylindrical portion that can be formed and having a large-diameter screw-like flange portion formed by engraving a screw groove on the outer peripheral surface at one end portion, and an annular flange portion formed at an opening portion at one end portion together with a joint member having engraved a thread groove on the inner peripheral surface, Ri Do and a fixing device for fixing a fitting main body to the post,
Engaging the engagement flange of the engagement member with the annular flange of the joint member, and connecting the engagement member and the metal fitting body by screwing the screw-like flange portion of the metal fitting body into the screw groove of the joint member. Rope metal fittings characterized by With the wedge member can be divided into a plurality, when fixed to the wire rope, rope end fitting according to claim 1, wherein the outer peripheral surface is formed in a tapered shape. The cable end fitting according to claim 1 or 2 , wherein a screw groove is formed in the other end portion of the metal fitting body, the screw groove is inserted into the support post, and is fixed to the support post by being screwed with a nut as a fixture. A cable end fitting for fixing the end of the wire rope to the support so that the wire rope is slid out when a load of a predetermined value or more is applied to the wire rope ,
The wedge member fixed to the outer peripheral surface of the wire rope is stored in the hollow taper portion of the engaging member so as not to be detached, and the end of the wire rope extended from the engaging member is inserted into the hollow cylindrical portion of the metal fitting body, A large-diameter engagement collar portion formed at one end of the engagement member and a large-diameter screw-shaped collar portion formed at one end portion of the metal fitting main body and engraved with a screw groove on the outer peripheral surface are opposed to each other. A screw groove carved on the inner peripheral surface of a joint member formed by forming an annular flange for locking the engagement flange of the engagement member in the opening of the engagement portion is screwed with the screw groove of the screw-shaped flange of the metal fitting body. And the fitting main body and the engagement member are integrally connected to each other by engaging the annular flange of the joint member with the engagement flange of the engagement member. A cable end bar that is fixed to the column by inserting a screw groove into the column and screwing a nut as a fixture. . Fixing of a wire rope using a rope end metal fitting characterized by using the rope end metal fitting according to any one of claims 1 to 4 and fixing the rope rope rope end of a rockfall guard fence or guard cable to a support column. Construction. 6. A structure for fixing a wire rope using a rope end metal fitting according to claim 5, wherein the wire rope slides a predetermined length against a fixing to the inner peripheral surface of the engaging member by a wedge member by a load of a predetermined value or more. . When a load of a predetermined value or more is applied to the wire rope, the wire rope slides out from the end fitting by sliding the wire rope against the fixing of the engaging member to the inner peripheral surface by the wedge member. 6. A wire rope fixing structure using a cable end fitting according to claim 5, which prevents breakage of the wire rope and deformation of the support column.

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