JP2002309519A - Rope member gripping device for impact absorbing fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope member gripping device for an impact absorbing fence capable of obtaining stable slide resistance and having excellent high energy absorption property by facilitating mounting of a rope member to gripping fitting and providing an uniform pressing force. SOLUTION: In this rope member gripping device for the impact absorbing fence gripping a halfway part of the rope member and absorbing impact by allowing the slide of the rope member when a tensile force exceeding a set value acts on the rope member this rope member gripping device consists of a box body having a grip groove allowing the insertion of the rope member and a lidlike pressing device having a plurality of projecting parts pressing the rope member in opposition to the grip groove of the box body to grip and fix the rope member slidably by a tensile force exceeding a predetermined value between the grip groove of the box body and the pressing device. In this case, a width of a cross sectional shape of the grip groove is set to be smaller than an outer shape dimension of the rope member, and a depth is set to be larger than a radius of circumscribed circle of the rope member and smaller than the outer shape dimension. A rope member pressing face of the projecting part of the pressing device is formed into a recessed part shape wrapping the rope member, and an interval of arrangements of a plurality of projecting parts is set to be multiple of 1/2 of a rope member strand pitch to obtain more effective device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope holding device for a shock absorbing fence used for a rock fall protection fence or a guard rope, etc., which is compact, easy to install, and effective for stably obtaining high energy absorption. The present invention relates to a rope material gripping structure.

[0002]

2. Description of the Related Art As shown in FIG. 9, for example, as shown in FIG. 9, when a plurality of horizontal rope materials are stretched between pillars to absorb and receive the impact of rock fall, etc.
The side of the horizontal rope material is gripped on the end of the horizontal rope material with extra length by the grip metal attached to the support, and the impact when falling rocks etc. is received, the energy is generated by the sliding friction resistance of the grip metal on the horizontal rope material gripping surface. Absorption methods have conventionally been employed. As shown in FIG. 9, a method of softly connecting the horizontal rope material with a plurality of vertical rope materials using a cross-holding bracket and absorbing energy by sliding frictional resistance of the soft connection portion is also required. Has been adopted.

Hitherto, as a gripping structure for a rope material,
As shown in FIG. 11 (a), a rope material is sandwiched between two metal plates 101 and 102 provided with a guide groove 111 of a rope material 130, or as shown in FIG. In this case, the local area is clamped by using a specially shaped locking member 113. However, a rope material 30 generally used for a shock absorbing fence is called a wire rope, and as shown in FIG. If the number of strands of strands and the number of strands are increased, it becomes a rope material with an outer shape closer to a circle, but it becomes a very expensive wire rope, so it is inexpensive and has high strand strength For example, as shown in FIG. 8, one having 3 × the number of strands (1 + 6) is used. Therefore, since the external cross-sectional shape is close to a triangle, FIG.
In a structure in which a rope material is sandwiched between two metal plates as shown in (a) or a structure in which a local material is sandwiched as shown in FIG. The wire was broken by the pressing force, and the pressing force did not become constant, and the gripping force of the rope material varied, so that energy could not be stably absorbed.

[0004] There is also a gripping structure of a rope material in which a bay portion 112 is provided in a holding groove of a metal plate as shown in FIG.
Also in this case, the outer shape of the rope material is closer to a triangle than a circle,
In addition, since the outer shape is round in the longitudinal direction, there is a technical problem that the rope material cannot be uniformly pressed. In addition, when the rope material is attached, a high torque is required because it is locally pressed, and special parts shapes and tools are also required.

[0005]

SUMMARY OF THE INVENTION In view of the above circumstances, the present invention provides a high energy absorbing property in which a stable sliding resistance can be obtained by easily attaching a rope material to a holding bracket and applying a uniform pressing force. It is an object of the present invention to provide a rope gripping device for a shock absorbing fence which is excellent in quality.

[0006]

According to the first aspect of the present invention, the rope material is gripped in the middle of the rope material, and when a tension greater than a predetermined value is applied to the rope material, the rope material is allowed to slide, thereby causing an impact. In a rope material gripping device for a shock absorbing fence to absorb, a lid having a box body having a gripping groove through which the rope material can be inserted and a plurality of protrusions pressing the rope material facing the gripping groove of the box body. The rope member was slidably gripped and fixed with a predetermined tension or more between the gripping groove of the box body and the pressing tool.

[0007] As described above, the gripping groove for inserting the rope material into the box body is provided, and the rope material is pressed into the gripping groove by the plurality of projections provided on the pressing tool. In addition, not only the bottom of the holding groove but also the side surfaces on both sides come into contact with the rope material, so that a stable frictional force is generated.

According to a second aspect of the present invention, the rope material is made to contact the gripping groove more reliably and uniformly, and the width of the cross-sectional shape of the gripping groove of the box is equal to the outer dimension of the rope material. It was set so that it was smaller and the depth dimension was larger than the radius of the circumscribed circle of the rope material and smaller than the outer dimension.

More specifically, based on an example of the cross-sectional shape of the gripping groove shown in FIG. 2, since the depth dimension d is made larger than the radius of the rope material 30, the rope material is pressed when the rope material is pressed into the gripping groove. Since the center of the material is located on the inner side of the groove from the upper end 11a of the holding groove 11, the strand of the rope material does not protrude outside the groove, and at the bottom of the holding groove and the side surfaces on both sides,
It works so as to more reliably hold and contact. In this case,
The guide width dimension C of the upper surface of the box, which forms the guide portion of the rope material from the upper end 11a of the grip groove (the flank of the presser projection) to the upper surface 1a of the box, is made larger than the outer shape of the rope material to have an R shape 1b. It is desirable to make it easier to press-fit the rope material and prevent the wire from sticking out.

According to a third aspect of the present invention, in order to more stably obtain a sliding resistance, the protrusion rope pressing surface of the pressing tool has a concave shape enclosing the rope, and the plurality of protrusions are arranged. The interval was set to be a multiple of 1/2 of the rope material strand pitch.

As described above, when the rope material is pressed, as shown in FIG.
As shown in (2), the protrusion pressing surface 21a of the pressing tool 2 that directly contacts the rope material 30 has a concave shape, so that when the rope material is pressed into the grip groove of the box, the center of the rope comes to the center of the grip groove. FIG.
(A) Since it is set to be half of the rope material strand pitch SP shown in (a), when a predetermined tightening torque is applied to a fastening member consisting of a bolt and a nut for fastening the box and the pressing tool, the plurality of projections are evenly distributed. Will be pressurized.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a rope material gripping device E <b> 1 includes a box 1 for accommodating a rope material 30, a pressing tool 2 having a plurality of protrusions 21 for pressing the rope material 30 contained in the box 1, and a box body. It comprises a bolt 3, a washer 4, and a nut 5 for fastening the pressure member and the pressing tool. As shown in FIGS. 1 and 2, the box body 1 has an attachment hole 1 for attaching the rope material holding device to a support or the like using a U-bolt or the like.
3. A holding groove 11 for press-fitting the rope material, a guide groove 12 for guiding the rope material to the holding groove, a recessed escape portion 12a for allowing a plurality of projections of the pressing tool to escape, and a pressing section for pressing the pressing tool. Has holes for bolts. Grip groove width dimension a
Is made smaller than the outer diameter b of the storage rope material 30, the depth d of the holding groove is made larger than the radius of the rope material, and the length is equal to or more than the strand pitch SP of the rope material (ideally, preferably twice).
, And the shape is such that the grip groove side surface and the outer diameter portion of the rope material are constantly and uniformly contacted to generate a frictional force. For example, when the outer diameter of the rope material is 18 mm, the width of the holding groove is set to 15 mm, and the depth of the holding groove is set to 10.5 mm. The cross-sectional shape of the guide groove is such that the rope material is easily pressed, the entrance side is opened in a trumpet shape so that the wire of the rope material does not protrude, and the entrance is formed into an R shape 1b. On the bolt loading side of the box 1, there is provided a rotation preventing projection 14 having a role of preventing rotation of the bolt. The pressing tool 2 is provided with a plurality of protrusions 21 on one side of a plate or a block, and presses the rope material against the box. The protrusions 21 are arranged in the longitudinal direction of the rope material, and the pitch thereof is the strand pitch SP of the rope material.
Are arranged in accordance with 1/2 of. It is composed of a bolt hole for pressing the pressing tool against this. When pressing the rope material, the protrusion 21 of the pressing tool 2 has a semicircular pressing surface 21 a so that the direction of the acting force is directed toward the center of the rope material, and the projection 21 is fitted with the shape of the holding groove 11 of the box 1. The rope's strands do not protrude out of the groove.

The gripping groove 11 of the box 1 accommodates the middle of the rope material 30 and places the pressing surface 21a of the projection 21 of the pressing tool 2 on the rope material. The bolt 3 is passed through the pressing tool 2 and tightened via the washer 4 and the nut 5. At this time, the head of the bolt 3 hits the detent 14 and co-rotation is avoided. The rope material is guided by the trumpet-shaped portion of the guide groove, and the rope material is further pushed into the center of the groove by the semicircular pressing surface 21a of the projection 21 of the pressing tool 2. The gripping force of the rope material is determined by the tightening force of the nut 5 that presses the pressing tool 2. When an impact force acts on the rope material 30 due to factors such as falling rocks or collision of a traveling vehicle, the impact force is reduced by the rope material 3.
0 acts as tension, and this tension is transmitted to the rope gripper. As shown in FIG. 1, the rope material 30 is gripped by frictional resistance between the pressing surface 21 a of the protrusion 21 of the pressing tool 2 and the holding groove 11 of the box 1. Therefore, when the tension acting on the rope member 30 is equal to or less than the set frictional force, the rope member 30 does not slide. When the tension acting on the rope member 30 exceeds the set frictional force, the rope member 30 starts sliding, and the impact energy is effectively attenuated by the sliding frictional resistance.

FIG. 4 shows an example in which the gripping device according to the present invention is applied to a two-groove rope material gripping device E2 for simultaneously gripping two rope materials. The two-groove rope gripping device fastens the box body 41 accommodating the rope material 30, the pressing tool 42 having a plurality of protrusions for pressing the rope material 30 housed in the box body 41, and the box body and the pressing tool. Bolt 43, washer 4
4. It is composed of a nut 45. The mounting hole 53 is
A hole for attaching a gripping device using a U-bolt. The holding groove and the projection structure of the pressing tool are the same as E1.

An example of a method of attaching the gripping device E1 or E2 according to the present invention will be described with reference to FIG. 3. A U-bolt 93 is passed through a bracket 82 welded to a support column 81, and the rope material 30 is passed through the U-bolt 93. Through the mounting hole 13 of the gripping device E that has been set by pressing, it is tightened with a washer 91 and a nut 92 to apply tension to the rope material 30 and install the rope material. Further, as shown in FIG. 5, there is a method of applying tension to the rope material by passing a U-bolt through the anchor bolt bracket 83, or a method of supporting a stay such as a column as shown in FIG. In this case, the stopper 35 is attached to the end of the rope material, and the rope material is being gripped halfway.

FIG. 9 shows an example in which the gripping device according to the present invention is applied to a cross gripping bracket E3 for gripping the horizontal rope 30 and the vertical rope 60 of the rock fall protection fence in a cross. In this case, the upper plate 71 and the lower plate 72 are provided with the rope material holding grooves 11 and the protrusions 21 corresponding to the pressing tools, respectively. As shown in FIG. 9, the cross-grip metal fitting E3 is applied to the connecting portion between the horizontal rope material gripping device E1 and the horizontal rope material and the vertical rope material, and the gripping force F3 of the cross grip metal fitting E3 is changed to the horizontal rope material gripping device E1. When the gripping force is set to be larger than F1 and is set to be smaller than the cutting force F0 of the rope material, the rope materials slide against each other against mutual frictional force. In addition, it works so that the grid of the vertical rope material does not become large, and as a result, the entire fence can absorb and receive the impact energy of the rock.

[0017]

The present invention has the following effects from the structure and operation described above. With a groove width smaller than the outer diameter of the rope material, energy is constantly absorbed by friction on the entire side surface of the groove width, so that impact can be absorbed with a small tightening torque. Therefore, the number and size of the fastening bolts can be significantly reduced as compared with the conventional metal fittings. When the groove length is longer than the strand pitch and the arrangement of the projections of the pressing tool is set to 1/2 of the strand pitch, a stable tension can be obtained with a small friction surface due to the pressing surface of the projection. The size can be greatly reduced as compared with the tool. Therefore, as shown in FIG. 4, the conventional gripping tool has a large metal fitting, so that a two-groove gripping tool which cannot be put to practical use can be adopted.

The number of bolts is reduced, the tightening torque is reduced,
By reducing the weight of the metal fittings, the number of work steps during construction is greatly reduced. Furthermore, material costs and construction costs can be significantly reduced as compared with the conventional case. In addition, since the tools at the time of construction can be handled by conventional tools, special expensive tools are not required.

[Brief description of the drawings]

FIG. 1 shows a rope material gripping device according to the present invention;
Front view (b) A side view is shown.

FIG. 2 is a cross-sectional view of a rope material press-fitting portion of the box.

FIG. 3 shows an example in which a rope material is attached to a support using the rope material gripping device according to the present invention.

FIG. 4 shows a two-groove type rope material gripping device according to the present invention.

FIG. 5 shows an example in which the gripping device according to the present invention is attached to a ground or a concrete wall.

FIG. 6 shows an example applied to a net supporting rope material.

FIG. 7 shows an example in which the rope material holding device according to the present invention is applied to a cross holding metal fitting.

FIG. 8 shows a wire rope.

FIG. 9 shows an example in which the rope material holding device according to the present invention is applied to a rock fall protection fence.

FIG. 10 shows an example of a conventional gripping metal structure.

FIG. 11 shows an example of another conventional gripping metal structure.

[Explanation of symbols]

E1 Single-groove type gripping device E2 Double-groove type gripping device E3 Cross gripping bracket 1 Box 1a Box upper surface 1b Box upper surface guiding groove R 11 Holding groove 11a Upper holding groove 12 Guide groove 12a Relief portion 2 Pressing tool 21 Pressing tool protrusion 21a Pressing tool protrusion pressing surface 3 Box body and pressing tool fastening bolt 4 Box body and pressing tool fastening washer 5 Box body and pressing tool fastening nut 30 Rope material 31 Element wire 32 Strand 33 Core rope 34 Reinforcing wire 35 Stopper 60 Rope material (vertical rope material) a Grip groove width dimension b Rope material outer diameter c Guide groove opening dimension d Grip groove depth dimension 41 Double groove box body 42 Double groove pressing tool 43 Bolt for 2 grooves 44 Washer for 2 grooves 45 Nut for 2 grooves 53 Box mounting hole for 2 grooves 81 Post 82 Mounting bracket 83 Anchor bolt bracket 1 U bolt mounting washer 92 U bolt mounting nut 93 U bolts SP strand pitch

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 2D001 PA06 PB04 PC03 PD06 2D101 CA06 DA04 EA02 FA25 FB15 GA11

Claims (3)

[Claims] 1. A rope material gripping device for an impact absorbing fence, which grips a middle portion of a rope material and absorbs an impact by allowing the rope material to slide when a tension greater than a set value acts on the rope material. A box body having a gripping groove through which the rope material can be inserted, and a lid-like pressing tool having a plurality of protrusions for pressing the rope material in opposition to the gripping groove of the box body. A rope material gripping device for a shock absorbing fence, wherein the rope material is slidably gripped and fixed with a predetermined tension or more between the pressing tools. 2. The method according to claim 1, wherein the width of the cross-sectional shape of the holding groove of the box is smaller than the outer dimension of the rope material, and the depth is larger than the radius of the circumscribed circle of the rope material and smaller than the outer dimension.
A rope material gripping device for the shock absorbing fence according to the above. 3. The projection rope material pressing surface of the pressing tool has a concave shape wrapping the rope material, and the interval between the plurality of projections is set to be a multiple of 1/2 of the rope material strand pitch. A rope material gripping device for a shock absorbing fence, characterized in that: