JP5019311B2 - 8-shaped rope - Google Patents

Description

  The present invention relates to an 8-shaped rope suitable for application to the formation of a net having a ring-like mesh by a rope.

  As a means for preventing the stone exposed on the slope from collapsing, there is a net type rock fall prevention method that covers the slope with a net. In this case, the vertical and horizontal main ropes are arranged in a grid on the same slope, and the intersections of the two are fixed with intersection fixing brackets, and appropriate or all intersections are placed on the slope ground as appropriate. It is connected to an anchor, and the net is restrained on a slope by this grid-like main rope (Patent Document 1).

In the net-type rock fall prevention method, a metal net is generally used as a net, but it is also known to use a ring net in which a ring-shaped mesh is formed by a rope instead of the metal net (Patent Document 2). One mesh in this ring net is formed by bending one rope 53 into a circular shape and attaching both ends of the metal fitting 54 like the rope ring 55 in FIG. 4 (a) shown for comparison with the function and effect of the present invention. It is formed by one ring connected and fixed by
Moreover, as a fence for preventing falling or falling rocks of the traveling vehicle, two parallel upper and lower support ropes are stretched between the columns, and a number of V-shaped net forming ropes are supported on the upper and lower sides. There has been proposed an impact absorbing fence that is attached between ropes to form an impact absorbing net (Patent Document 3).
Furthermore, an impact absorbing fence is also proposed in which a ring net (generally the same as the ring net of Patent Document 1) in which ring-shaped rope members are chained in the vertical and horizontal directions is stretched between struts (FIG. 7 of Patent Document 4). ).
Japanese Patent No. 2829825 JP 2000-178925 A JP-A-8-92918 JP 2000-248513 A

The rock fall prevention method (Patent Document 1) using the above ring net can follow the undulations by free surface deformation according to the unevenness of the slope, and can form a net with higher rigidity than the metal net. Therefore, there is an advantage that the force to press the slope is always strong, but a lot of rope rings are required.
For this reason, it is troublesome to make a large number of rope rings, and a large number of end fixing brackets for fixing both ends of the rope to form the ring are required, resulting in an increase in cost. Further, the operation of connecting the large number of rope rings to form a ring net is cumbersome and has poor workability due to the large number of operations.

In addition, in the slope stabilization method, a support plate is attached to each head of a large number of anchors placed on the slope, and this is fastened to give a support pressure to the ground. In addition, when adopting the slope stabilization method of the net covering that covers the slope with the net, it is possible to use the above-mentioned simple ring-shaped rope ring for the net, but in that case also make a lot of rope rings The same problem as described above arises that the work and the work of forming the ring net by rope ring are complicated, the workability is poor, and the cost is high.
Further, the present invention is not limited to the rock fall prevention method and the net covering slope stabilization method, and the same problem as described above arises when a net having a ring-like mesh by a rope is formed. Even when the number of meshes is not so large as to be a net, the same problem as described above occurs when a member having a plurality of meshes is produced using a rope.

  In addition, it is necessary to sufficiently increase the connection strength of both ends of the rope ring forming each mesh of the net so that the connection is not released when a large tension is applied, but as will be described later in comparison with the present invention. A conventional rope ring in which one ring is formed by one rope has a face that makes it difficult to sufficiently increase the connection strength of both end connection portions.

Moreover, the impact absorbing fence (Patent Document 3) using the V-shaped rope has the following drawbacks.
(B) Since a large number of V-shaped ropes must be crossed for construction, the construction is complicated.
(B) Since all the intersections of the V-shaped ropes must be fixed with metal fittings, the metal fittings are expensive and time-consuming.
(C) When a part of the shock absorbing net formed of V-shaped rope is damaged by falling rocks, etc., each V-shaped rope is intricately entangled with other V-shaped ropes, so only a part of it is replaced. Is extremely difficult.

  In addition, the impact absorbing fence (Patent Document 4) in which the ring net is stretched between the columns has the defects substantially similar to those of Patent Document 1 described in paragraph [0004], such as poor workability.

  The present invention has been made to solve the above-mentioned conventional drawbacks, and can form a net having a ring-like mesh by a rope easily and inexpensively, and can easily ensure high connection strength. The purpose is to provide.

  The 8-shaped rope of the invention of claim 1 which solves the above-mentioned problem is formed by folding one rope in half and forming a small ring at the folded portion, and curving both sides of the processed rope into a substantially circular shape, After passing through the ring, both ends are fixed to each other and are prevented from coming off from the ring, and are formed into an eight-letter shape.

  The eight-shaped rope of the invention of claim 2 folds one rope into two and attaches a knot portion metal fitting having a through hole for a tip to the folded portion to form a processed rope, and both sides thereof are substantially circular. It is characterized in that it is formed in an eight-letter shape after both ends thereof are passed through the tip through-holes of the knot portion metal fittings and then prevented from coming off from the tip through-holes.

  The eight-shaped rope according to the invention of claim 3 is formed by folding the one rope in half, and having the two parts of the knot portion metal fitting having two base end through holes and one distal end through hole. Form a processed rope with a knot fitting by passing through the base through hole, and curl both sides thereof in a substantially circular shape, and pass both ends of the rope through the tip through hole of the knot fitting. It is characterized in that it is formed in an eight-letter shape so as to prevent it from coming off from the through hole for use.

  A fourth aspect of the present invention is the rope center position defining bracket for defining the rope center position in the eight-shaped rope of claim 3 having a size that does not come out of the base end through hole at the center portion of the rope folded in half. It is characterized by fixing.

  According to a fifth aspect of the present invention, in the eight-shaped rope according to the third aspect, the knot portion metal fitting is integrally formed with a guide groove that accommodates the bent curved portion of the rope continuously to the two base end through holes, and the guide The opposite side to the guide groove of the two rows of ropes housed in the groove and passed through the two base end through holes on both sides is fixed by a metal fitting.

  The eight-shaped rope of the invention of claim 6 attaches a knot fitting having a through hole for a tip to the fixed end portion of a bifurcated rope formed by fixing the aligned end portions of two ropes. Both sides of the bifurcated rope are bent into a substantially circular shape, and both ends thereof are passed through the tip through-hole of the joint fitting, and then formed into an 8-letter shape to prevent the tip-through hole from coming off. And

  The eight-shaped rope according to the invention of claim 7 is a metal fitting for a knot having a through hole for a proximal end and a through hole for a distal end on both side portions of a bifurcated rope formed by fixing aligned ends of two ropes. After passing through the base end through hole, both side portions thereof are bent into a substantially circular shape, and both ends thereof are passed through the tip end through hole of the knot portion metal fitting to prevent the tip end through hole from coming off. It is characterized in that it is formed in an eight-character shape.

According to the 8-shaped rope of the present invention, for example, when a net is formed using this, the operation of forming the net by engaging the 8-shaped rope having two ring-shaped meshes is simply a ring of one rope. Compared with the work of forming a net by engaging the shaped rope ring, the work amount is reduced, so that the workability is improved.
Even when the number of meshes is not so large as to be a net, when a member having a plurality of meshes is produced using a rope, the production is easy.

According to the eight-shaped ropes of claims 1 to 5, a plurality of eight-shaped ropes, each of which is formed into a character of one rope, are engaged to form a net made of a ring-shaped mesh. Two ring networks are formed.
Therefore, the number of ropes as a whole net can be halved compared with the conventional rope ring method in which one rope forms a single ring mesh.
For this reason, in order to form a ring-shaped mesh, the part of a rope both-ends connection part is half compared with the case where a rope ring is used, and cost can be reduced.
Also, the 8-shaped rope can be easily and sufficiently connected.

  According to the eight-shaped rope of the first aspect, the metal fitting required for making the eight-shaped knot is only a simple one such as a clamp tube and a thimble, and the eight-shaped rope can be formed at low cost.

According to the 8-shaped rope of claims 2 to 5, the rope tip protruding from the joint for the joint of the 8-shaped rope is parallel to the 8-shaped surface and does not protrude upward. Is preferable from the viewpoint of workability without being caught on the knot. Moreover, it is preferable also in appearance.
Moreover, the operation | work which makes an 8-shaped rope using the metal fitting for a node part is easy.

  As in the 8-shaped rope of claim 3, using a knot fitting having two base end through holes and one tip through hole is obtained by curving both side portions of the folded rope in a circle. It is suitable for making it into an eight-shape and for preventing the rope tip from coming off.

  According to the eight-shaped rope of claim 4, by providing the rope center position defining bracket, the structure of the knot portion bracket can be simplified, and the rope center position defining bracket is simply clamped. Since a tube can be used, a structure with a relatively simple knot is sufficient.

  In particular, according to the fifth aspect, the rope turn-back portion can be formed by simply placing the center portion of the rope along the turn-back guide groove, so that the width dimension W of the knot portion metal fitting can be reduced, and the size becomes compact. .

  According to the eight-shaped rope of claim 6 or 7, instead of folding one rope, a bifurcated rope having two ropes aligned and fixed with a clamp tube is used. The distance between the ropes on both sides can be narrowed, and therefore the width dimension W of the metal fitting for the knot portion can be narrowed, resulting in compactness.

  Hereinafter, an embodiment of the 8-shaped rope of the present invention will be described with reference to FIGS.

FIG. 1 shows a part of a processed rope 13 which is a material for forming an 8-shaped rope according to an embodiment of the present invention. One rope 13a is folded in two, and its folded portion is aligned with a thimble 13b. In this state, a small ring (rope) 13d is formed at the center by compression through a clamp tube 13c whose cross section is shown in FIG.
FIG. 2 explains the procedure for forming the 8-shaped rope 9 of one embodiment using the processed rope 13 along the procedure. As shown in FIG. 2 and passing both ends 13a ′ and 13a ″ through a ring 13d as shown in FIG. 2 (b), and then compressing and fixing both ends through another clamp tube 14, the positions are 8 As shown in Fig. 2 (c), it becomes an eight-shaped rope 9. The clamp pipe 13c and the clamp pipe 14 are both short aluminum pipes. Both ropes are fixed to each other by compressing them through the ropes.

The above-mentioned 8-shaped rope 9 can be used, for example, when forming a net laid on a slope in a rock fall prevention method or a slope stabilization method, a net stretched between struts as a rock fall protection fence, and other nets.
FIG. 3 shows a part of the net 6 formed by using the 8-shaped rope 9, and a large number of 8-shaped ropes 9 are connected to each other in a ring-like mesh (refer to one ring-shaped portion in the 8-shaped rope 9). The net 6 can be formed by engaging each other so that they are entangled with each other.

When the net is formed with a rope, when the 8-shaped rope 9 is used as a means for forming a ring-shaped mesh, a single ring is formed with a single rope like a conventional rope ring. Compared with the case where it does, the connection intensity | strength of a rope both-ends connection part can be made high enough.
That is, in the case of the rope ring 55 in which one rope 53 is curved in a circular shape and both ends are compressed and fixed by the clamp pipe 54 as in the conventional rope ring 55 shown in FIGS. Since the tension of 53 acts in the same direction as the penetration direction of the clamp tube 54 as shown by the arrow (that is, the direction in which the rope 53 comes out of the clamp tube 54), it is difficult to sufficiently increase the rope end fixing strength by the clamp tube 54. 4 (c), the force acting on the rope has a direction having an angle with respect to the penetration direction of the clamp tube 14 as shown by an arrow (that is, the same as in FIG. 2 (b)). The rope acts in a direction that is angled with respect to the direction in which the rope comes out of the clamp tube 14), so there is little risk that the rope will come out of the clamp tube 14. Therefore, as described above, the connecting strength of the rope both ends connecting portion can be made sufficiently high.

The 8-shaped rope 9 forming the ring-shaped mesh in the net 6 forms two ring-shaped meshes with one rope.
Therefore, the number of ropes as a whole of the net 6 can be halved compared to a conventional rope ring method in which one rope forms a single ring mesh.
For this reason, the part of the rope both ends connecting part for forming the ring-shaped mesh (the knot part 15 in the present invention) is half as compared with the case of using the rope ring, and the cost can be reduced.
Further, the work for forming the net 6 by engaging the 8-shaped rope 9 requires less work and improves the workability compared with the work for forming the net by engaging the conventional ring net.
Further, since the 8-shaped rope 9 can be made by the operation shown in FIG. 2, for example, when forming a net on the slope in the rock fall prevention method or the slope stabilization method, the size of the ring mesh (ring diameter) ) Is easy to adjust in the field, so if there is a tree on the slope, it is easy to dodge the tree.

In addition, as shown by a one-dot chain line in FIG. 3, when four sides of the concave rhombus 10 surrounded by four adjacent ring-shaped meshes are coupled by the mesh coupling member 11, For example, when applied to a rockfall prevention net or a slope stabilization method net, the net 6 is effective for exerting a pressing force.
Various members can be used as the mesh coupling member 11, and for example, the rope ring 55 described with reference to FIG.

When making the above-mentioned 8-shaped rope 9, an auxiliary fitting 35 as shown in FIG. 5 can be used as means for firmly fixing the rope ends 13a ′ and 13a ″ by the clamp tube.
The auxiliary metal fitting 35 has a structure in which a cylindrical portion 37 through which both end portions 13a ′ and 13a ″ of the processing rope 13 are aligned and passed through a base plate 36 having an area that cannot be removed from the ring 13d of the processing rope 13 is fixed obliquely.
In FIG. 2B, before the both ends 13a ′ and 13a ″ of the processing rope 13 are passed through the clamp tube 14, the auxiliary metal fitting 35 is placed on the ring 13d of the processing rope 13 and the rope both ends 13a ′ and 13a ″. Is passed through the hole 36a of the base plate 36 and the hollow portion 37a of the tubular portion 37, and then the rope ends 13a 'and 13a "are passed through the clamp tube 14 to compress the clamp tube 14 and the rope ends 13a' and 13a". Are fixed to each other. Thereby, reinforcement of the rope both ends connection part by the clamp pipe 14 is achieved.

FIG. 18 is a schematic plan view showing an embodiment in which the above-described 8-shaped rope 9 is used as the rock falling prevention net 6A of the rock falling prevention device 8. In the figure, main ropes 1 and 2 are arranged in a lattice shape in a vertical direction (slope inclination direction) on a slope and a horizontal direction (substantially horizontal direction) perpendicular to the slope. The anchor 3 is driven at the intersection of the main rope 1 (referred to as a horizontal rope in some cases) 2 and the main rope 2 in the lateral direction. The crossing portion of the vertical rope 1 and the horizontal rope 2 is fixed to each other by a crossing portion fixing / anchor connecting metal fitting 5 although not described in detail, and is connected to the anchor 3 via the crossing portion fixing / anchor connecting metal fitting 5. Has been. The knot 15 of the 8-shaped rope 9 is symbolized and indicated by a black circle.
A large grid-like mesh is formed by the vertical and horizontal main ropes 1 and 2, and a ring-like mesh is generally formed within one square mesh (only one square mesh is shown in FIG. 18). A rock fall prevention net 6A similar to the net 6 of FIG. 3 is disposed and engaged with main ropes 1 and 2 forming a large mesh. Engagement with the main ropes 1 and 2 is performed by entanglement with the main ropes 1 and 2 when the 8-shaped rope 9 is formed. In the illustrated example, the four sides of the concave diamond-shaped portion 10 surrounded by four adjacent ring-shaped meshes are coupled by the mesh coupling member 11 described with reference to FIG. 3 for reinforcement.
Thus, when the 8-shaped rope 9 is applied to the rock falling prevention net 6A of the rock falling prevention device 8, the various effects described above such as improvement in workability can be obtained.

FIG. 19 is a schematic front view showing an embodiment in which the above-described 8-shaped rope 9 is used as a rock fall protection fence net 6 </ b> B stretched between struts 92 in the fall rock protection fence 91. The rockfall protection fence 91 is provided with support posts 92 on the slope with a space therebetween, and an upper support rope 93, an intermediate support rope 94, and a lower support rope 95 that extend laterally at the upper, middle, and lower portions of each support 92. Is fixed with a stopper 96, and a net (falling rock guard fence net 6B) is formed between the upper support rope 93 and the lower support rope 95, and an upper support rope 93 and an intermediate support rope 94 are formed. In this structure, the lower support rope 95 is engaged.
Thus, when the 8-shaped rope 9 is applied to the rock fall protection fence net 6B of the rock fall protection fence 91, the various effects described above such as improved workability can be obtained.

7 to 10 show an 8-shaped rope 9A of another embodiment. FIG. 7 shows a procedure for forming the 8-shaped rope 9A. (A) is a plan view of the state before the completion of the 8-shaped rope, and (b) is a plan view after the completion. As shown in FIG. 8, this 8-shaped rope 9A uses a processing rope 63 in which a cylindrical clamp tube 63b is compressed and fixed at the center in the length direction of one rope 63a. The clamp tube 63b is previously attached at the factory.
Also, like the knot fitting 62 shown in FIG. 9 and FIG. 10, a rectangular parallelepiped shape is formed, and a long through hole 62a is formed in the center of the upper part, and round holes are provided on the left and right sides of the lower part respectively. A metal fitting with a through hole 62b is used.
The clamp pipe 63b is a metal fitting (rope center position specifying metal fitting) for defining the central position of the rope 63a, and has a size that does not pass through the base end through hole 62b of the knot portion metal fitting 62.

When making the 8-shaped rope 9A on site using the processed rope 63 and the knot fitting 62, the left and right proximal ends of the processed rope 63 on both sides (rope 63a) The clamp pipe 63b is passed through the hole 62b until it substantially contacts the knot fitting 62, and both side portions thereof are curved in a substantially circular shape as shown in FIG. 7 (a), and both end portions 63a ′ and 63a ″ are knotted. After passing through the distal end through hole 62a (see FIG. 9) in the upper center of the part fitting 62, as shown in FIG. 7 (b), the both ends are passed through another clamp tube 64 for preventing the rope end from coming out and compressed and fixed. Then, these portions become the nodal portions 65 of the two ring-shaped meshes forming an 8-shaped form, and an 8-shaped rope 9A is obtained.
The clamp tube 63b fixed to the central portion of the rope 63a does not come out of the through hole 62a for the tip of the nodule fitting 62, thereby defining the central position of the rope 63a and equal ring meshes on both sides. Form.

Since the above-mentioned 8-shaped rope 9A has the distal end portions 63a ′ and 63a ″ of the processed rope 63 extending in parallel with the inclined surface from the distal end through hole 62a of the knot portion fitting 62, the 8-shaped rope of FIG. 2 and FIG. Unlike the rope 9, the tip portions 63 a ′ and 63 a ″ do not protrude upward at the knot portion 65. Therefore, for example, the operator who forms the net on the slope in the rock fall prevention method or the like is not caught by the knot portion, which is preferable in terms of workability. Moreover, it is preferable also in appearance.
In addition, unlike the processing rope 13 shown in FIGS. 1 and 2, it is not necessary to form a ring 13d for passing both ends of the rope together, so that the operation of making the processing rope 63 is easy. Further, the thimble 13b for forming the ring is not necessary, and the number of members can be reduced.

11 and FIG. 12 shows another modification of the structure similar to the nodal fitting 62 shown in FIGS. 7 to 10, and FIG. 12 (a) is a plan view. (B) is a front view and (C) is a left side view. FIG. 13 shows the vicinity of the knot portion metal fitting 72 when the nodal piece metal fitting 72 forms the 8-shaped rope 9B. FIG. 13A is a horizontal cross-sectional view (cross-sectional view taken along line EE in FIG. 12B). And (b) are vertical sectional views (corresponding to the FF sectional view of FIG. 12 (b)). The entire illustration of the 8-shaped rope 9B is omitted.
The knot portion metal fitting 72 has a long through hole 72a for a distal end of a long hole in the center of the upper part, and the same as described above in that it has a through hole 72b for a proximal end of a round hole on the left and right sides of the lower part. The outer shape is not a rectangular parallelepiped shape, but the shape viewed from the side is such that the folding guide portion 72c for forming the folding portion at the center of the rope protrudes in the rope length direction (the horizontal dimension in FIG. 12 (c)). It is integrally formed. The other part is thin with a small dimension in the rope length direction. The folding guide portion 72c has a guide groove 72d that accommodates the folding curve portion of the rope continuously to the two base end through holes 72b.

When forming the 8-shaped rope 9 </ b> B using the knot portion metal fitting 72, both side portions of one rope 73 a are passed through the left and right proximal end through holes 72 b below the knot portion metal fitting 72. At that time, the lengths of both side portions of the rope 73a are made uniform, and the folded curved portion at the center of the rope is made to follow the guide groove 72d of the folded guide portion 72c. Next, the clamp pipe 73b is passed through the both side portions of the aligned ropes and compressed and fixed at a position close to the knot portion fitting 72. The clamp pipe 73b fixes the opposite side to the guide grooves 72d of the two rows of ropes that are passed through the two base end through holes 72b on both sides, thereby defining the center position of the rope. The processed rope 73 with the knot fitting is obtained as described above, but has been manufactured in the factory so far.
When making the 8-shaped rope 9B on site using the processed rope 73 with the above-mentioned metal fitting for the knot portion, both side portions of the rope 73a are curved in a substantially circular shape as in FIG. ', 73a "is passed through the top through hole 72a at the center of the upper part of the joint 72, and then both ends are passed through another clamp tube 74 for preventing the rope tip from coming out. It becomes the nodule portion 75 of the two ring-shaped meshes formed, and an 8-shaped rope 9B is obtained.

In this embodiment, the knot 72 is already integrated with the rope 73a, so that the work at the site is simplified.
Further, when the clamp pipe 63b for defining the rope center position is fixed to the folded portion of the rope as shown in FIGS. 7 to 10, the distance between the folded ropes is widened, and the width dimension of the fitting 62 for the knot portion is increased. Although W is large, according to the knot portion metal fitting 72 of this embodiment, the rope turn-back portion can be formed by simply turning the rope center portion along the guide groove 72d. The width dimension W is small and compact.

  14 to 17 show an 8-shaped rope 9C of still another embodiment. FIG. 14 shows a procedure for forming the 8-shaped rope 9C. (A) is a plan view of the 8-shaped rope 9C before completion, and (B) is a plan view after completion. As shown in FIG. 15, this eight-shaped rope 9C uses a bifurcated rope 83 in which two ropes 83a and 83a having the same length are aligned and the ends thereof are fixed to each other by a clamp tube 83b. The clamp tube 83b is fixed in advance at the factory. Further, as shown in FIG. 16, a nodule fitting 82 having a rectangular parallelepiped shape and having an elongated through hole 82a and a proximal through hole 82b in the center of the upper and lower portions, respectively, is used.

  When the above-mentioned bifurcated rope 83 and the nodal portion metal fitting 82 are used to make an 8-shaped rope 9C on the site, the ropes 83a and 83a on both sides of the bifurcated rope 83 are used for the proximal end of the lower portion of the nodal portion metal fitting 82. The clamp tube 83b is passed through the through hole 82b until it almost contacts the knot fitting 82, and the ropes 83a and 83a on both sides are bent into a substantially circular shape as shown in FIG. 83a "is passed through the tip through hole 82a at the upper center of the nodal fitting 82, and then both ends are passed through another clamp tube 84 for retaining the rope tip as shown in FIG. These portions become the nodule portions 85 of two ring-like meshes having an 8-shaped shape, and an 8-shaped rope 9C is obtained.

According to the knot fitting 82, a bifurcated rope 83 in which two equal-length ropes 83a and 83a are aligned and fixed by a clamp tube 83b is used instead of folding one rope. The rope interval B (see FIG. 15) can be narrowed. Therefore, it is only necessary to provide one long hole as the base end through hole 82b, and the width dimension W of the knot fitting 82 can be narrowed. The structure is simplified and compact.
In this embodiment, the nodule fitting 82 has a rectangular parallelepiped shape, but is not necessarily in the shape of a rectangular parallelepiped, and since the same effect can be exhibited if there is a through hole, a disk shape or a spherical shape, A cylindrical shape can also be used.

  The eight-shaped rope of the present invention can be used to form a net used in the rock fall prevention method and the slope stabilization method, and other nets. However, even if the number of meshes is not so large, there are four ropes. The present invention can be used when a member having the above-described mesh is manufactured. Furthermore, the present invention is not limited to the case where the 8-shaped ropes are engaged with each other, and the 8-shaped rope can be used as a single member.

(A) is a partially omitted plan view of a processing rope which is a material forming the 8-shaped rope of the present invention, and (B) is a cross-sectional view of a clamp tube used for the processing rope of (A). (A), (b), (c) is a figure explaining the point which forms the 8-shaped rope of this invention using the processing rope of FIG. 1 along a procedure. It is a top view which shows a part of ring net formed using multiple said 8-shaped ropes. It is a figure for demonstrating compared with the conventional rope ring about the intensity | strength of the said 8-shaped rope. The auxiliary | assistant metal fitting in the case of using an auxiliary | assistant metal fitting in order to form an 8-shaped rope is shown, (A) is a top view, (B) is a front view, (C) is DD sectional drawing of (A). is there. It is a front view which shows the knot part of an 8-shaped rope at the time of using the auxiliary metal fitting of FIG. The point which forms the 8-shaped rope of another Example is shown, (A) is a top view of the state before completion of an 8-shaped rope, (B) is a top view after completion. It is a top view of the rope material used for the 8-shaped rope of FIG. It is a perspective view of the metal fitting for a knot part used for the 8-shaped rope of FIG. FIG. 10 is a cross-sectional view of the knot portion metal fitting of FIG. 9. It is a perspective view of the metal fitting for a knot part of another modification of the structure similar to the metal fitting for a knot part shown in FIGS. (A) is a plan view of the metal fitting for a knot part in FIG. 11, (b) is the front view, and (c) is the left side view. 11 and 12 show the vicinity of the knot portion metal fitting in the case where an eight-shaped rope is formed with the knot portion metal fitting shown in FIG. 11, (a) is a horizontal sectional view (the EE cross sectional view of FIG. 12 (b)). Equivalent) and (B) are vertical sectional views (corresponding to the FF sectional view of FIG. 12 (B)). Furthermore, the point which forms the 8-shaped rope of another Example is shown, (A) is a top view of the state before completion of an 8-shaped rope, (B) is a top view after completion. It is a top view of the rope material used for the 8-shaped rope of FIG. It is a perspective view of the metal fitting for a knot part used for the 8-shaped rope of FIG. It is a perspective view of the vicinity of the metal fitting for a node part in FIG. FIG. 4 is a schematic plan view showing a part of a rock fall prevention device constructed by laying the net of FIG. 3 on a slope. FIG. 4 is a schematic front view showing a part of a rock fall protection fence constructed by stretching the net of FIG. 3 between struts.

Explanation of symbols

6 Net 6A Falling rock prevention net 6B Falling rock guard net 9 Eight-shaped rope 10 Recessed rhombus 11 Mesh connecting member 13 Rope 13a Rope 13a ', 13a "(Rope) both ends 13b Thimble 13c Clamp tube 13d Ring (Rope stopper) )
14 Clamp tube 15 Knot portion 35 (ring-shaped mesh of 8-shaped rope) Auxiliary metal fitting 36 Base plate 36a Hole of base plate 37a Tube portion 37a Hollow portion 9A, 9B, 9C 8-shaped rope 62, 72, 82 Knot fittings 62a, 72a, 82a End through holes 62b, 72b, 82b Base end through holes 72c Folding guide section 72d Guide groove 63 Processed rope 73 Processed rope 73 (with knot section bracket) Processed rope 83 Bifurcated Rope 63a, 73a, 83a Rope 63a ', 63a ", 73a', 73a" (Rope) both ends 83a ', 83a "(Rope) end 63b Clamp tube (Rope center position regulating bracket)
83b Clamp pipes 64, 74, 84 (for securing the rope end) Clamp pipes 65, 75, 85 (for the ring-shaped mesh of the eight-shaped rope) Nodule 91 91 Fall rock protection Fence 92 Strut 93 Upper support rope 94 Intermediate support rope 95 Lower support rope 96 Fastening bracket

Claims (7)

  Fold one rope in half and make a small ring at the folded part. Both sides of the processed rope are bent into a substantially circular shape, and both ends are passed through the ring. An eight-shaped rope characterized by being formed into an eight-letter shape in order to prevent it from coming off.   A rope is folded in half and a knot fitting having a through hole for a tip is attached to the folded portion to form a processed rope, and both side portions thereof are bent into a substantially circular shape, and both ends thereof are used for the knot portion. An eight-shaped rope characterized by being formed into an eight-letter shape after passing through a through-hole for a tip of a metal fitting, so as to prevent removal from the through-hole for a tip.   One rope is folded in half, and both side portions thereof are passed through the two base end through holes of the nodal bracket having two base end through holes and one tip through hole, respectively. A processing rope with a metal fitting is formed, and both side portions thereof are bent into a substantially circular shape, and both ends thereof are passed through the through hole for the tip of the joint for the knot portion, and then prevented from coming off from the through hole for the tip. An 8-shaped rope characterized by being formed into a letter shape.   The rope center position defining bracket having a size that does not come out of the base end through hole and defining the rope center position is fixed to the center portion of the rope folded in half. 8-shaped rope.   A guide groove is formed integrally with the joint for the knot portion so as to accommodate the curved bent portion of the rope continuously to the two base end through holes, and the two base end penetrations on both sides are accommodated in the guide groove. The 8-shaped rope according to claim 3, wherein the opposite side of the guide grooves of the two rows of ropes through which the holes are passed is fixed with a metal fitting.   Attach a knot fitting with a through hole for the tip to the fixed end of the bifurcated rope formed by fixing the aligned ends of the two ropes, and bend both sides of the bifurcated rope into a substantially circular shape. Then, both ends thereof are passed through the tip through-holes of the metal fittings for knots, and then formed into an eight-letter shape so as to prevent removal from the through-holes for tip. After passing both side portions of the bifurcated rope formed by fixing the aligned ends of the two ropes through the base end through hole of the knot fitting having the base end through hole and the tip through hole The both side portions are curved in a substantially circular shape, and both ends thereof are passed through the tip through-holes of the knot fittings, and then formed into an eight-letter shape to prevent the tip-through holes from coming off. The 8-shaped rope according to claim 6 .

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