JP3850019B2 - Fastening bracket for rope crossing - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a metal fitting suitable for fastening an intersecting portion of ropes crossed and stretched.
[0002]
[Prior art]
For example, on slopes along the road, a method of laying a rope in a net shape along the surface of the ground is used to prevent falling rocks and landslides. A number of ropes are stretched in the direction, and each intersection is fastened with a U-bolt. However, simply tightening the crossing portion of the rope with a simple U-bolt causes the ropes to move apart and the entire crossing portion of the rope easily moves together with the U-bolt, which causes the net to be deformed. It was.
[0003]
As countermeasures, conventionally, as shown in FIG. 13 (a), a metal plate A which is formed by pressing a plate material to form a groove a having a semicircular cross section, and a groove b which should intersect with the groove a are also pressed. A fastener for a rope crossing portion having a structure with a split clamp formed by a pressing metal B formed with a receiving metal A ′ and a pressing metal B ′ casted including the groove a as shown in FIG. 13B. Fastening brackets for rope crossings having a structure that is divided into two clamps are known.
[0004]
[Problems to be solved by the invention]
In the case of such a clamp system, it is usually said that a fastening force up to a rope working load (for example, about 1/3 of the rope cutting load) is required. Grooves (lower half, upper half) a and b of 'and the pusher brackets B and B' have a uniform depth over the entire length, and the vertical rope R and the horizontal rope R 'fit approximately half of the cross section. In this state, the rope crossing portion RC overlapped vertically and was only pressed against each other by being tightened by screwing of the bolt and nut.
[0005]
For this reason, a sufficient fastening force that does not cause slippage at the crossing portion of the rope cannot be obtained, and the rope is displaced in the longitudinal direction due to the load, and there is a possibility that the lattice shape composed of the vertical rope and the horizontal rope may collapse. .
[0006]
As countermeasures, unevenness is arranged in the groove at a pitch corresponding to the trough of the rope, or a friction coefficient increasing material such as glass powder is interposed, but the hardness difference between the rope and cast steel is significant. Therefore, it was hardly effective.
[0007]
The present invention has been made to solve the above-mentioned problems, and the object of the present invention is to be able to firmly fasten the intersection of ropes with a small and simple structure and a small tightening force. The object is to provide a fastener for a rope crossing.
[0008]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the present invention provides a receiving metal fitting and a pressing metal, each of which has a single rope-fitting groove formed on the inner surface, which intersects each other when they are arranged relative to each other, and a fastening tool for fastening the receiving metal fitting and the pressing metal. The rope fitting groove for the rope crossing portion provided with the rope fitting groove of the receiving bracket has a recessed portion at an intermediate portion, and the rope fitting groove of the pressing fitting that crosses the rope fitting groove when facing the receiving bracket is intermediate. It is characterized in that it has concave portions at the portions, the rope intersection portions are bent in the direction perpendicular to the axial direction at the concave portions, and the intersection portions are respectively pushed into the concave portions.
[0009]
The recesses of the receiving metal and the pressing metal are formed so that the intersecting part is deepest and gradually shallower toward both sides, and the maximum depth is about twice the depth of the rope fitting groove.
[0010]
The receiving metal fitting and the push metal fitting include a case where they are common metal fittings having the same configuration as well as a case where they are different from each other.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a rope net to which the present invention is applied. Reference numeral 1 denotes a slope, and a plurality of ropes 3 and 3 'are provided in the vertical direction and the lateral direction via anchors 2 and 2 fixed on the slope 1 respectively. Is stretched. And each cross | intersection part of each rope 3 and 3 'is fastened with the fastening metal fitting 4 (henceforth fastening metal fitting) 4 of this invention.
[0012]
Between the ropes 3 and 3 ', a plurality of intermediate ropes 5 are arranged in the vertical direction and the horizontal direction, and each crossing portion is fastened by the crossing portion fastening bracket according to the present invention or any other fastening bracket. ing.
[0013]
FIGS. 2 to 9 show a first embodiment of a fastener according to the present invention. The fastener 4 includes a receiving metal 6 and a pressing metal 7 that are to be arranged opposite to each other. 3 'is sandwiched in an orthogonal shape and fastened by the first fastening tool 8 and the second fastening tool 9, so that the crossing portion of the rope is fastened. The first fastener 8 is a bolt in this example, and the second fastener 9 is an anchor bolt 9a and a nut 9b in this example.
[0014]
FIG. 8 shows the receiving bracket 6 as a single unit. In this example, it is made of a cast board having a substantially oval or oval shape in the plane, and one rope fitting groove 10 is formed on the inner surface in an oblique direction as viewed from the plane.
The rope fitting groove 10 has an arc shape with a width substantially equal to that of the rope 3 (3 ′) to be used and a depth of ½ or less of the cross-sectional area of the rope, but includes an intermediate portion, that is, a crossing portion of the rope. A recessed portion 100 that is recessed in the metal fitting thickness direction is formed in the required range on both sides.
[0015]
The recessed portion 100 is a space where one of the intersecting ropes 3 and 3 ′ can be locally bent in a direction perpendicular to the axial direction when the first fastening tool 8 and the second fastening tool 9 are fastened. In order to receive and contact the bent portion, the width is the same as that of the rope fitting groove 10, but the depth corresponds to the rope crossing portion as shown in FIG. 4 and FIG. 8 (d). It is deep and has an arc shape that gradually becomes shallower as it goes away from the rope intersection, and the maximum depth is about twice the depth of the rope fitting groove 10.
[0016]
On both sides near the outside of the rope fitting groove 10, a female screw hole 13 for screwing with a bolt as the first fastening tool 8 and a through hole 12 for inserting the anchor bolt of the second fastening tool 9 are provided. ing.
[0017]
FIG. 9 shows the pressing metal 7 as a single unit. In this example, the pressing metal 7 is made of a cast board having a substantially oval or oval shape on the plane, and the inner surface of the rope fitting groove 10 ′ is obliquely viewed from the plane. Is formed.
The rope fitting groove 10 ′ is in a relationship orthogonal to the rope fitting groove 10 of the receiving metal 6 when the pressing metal 7 is reversed and opposed to the receiving metal 6, and the rope 3 ′ (3 ′) to be used It has an arc shape with substantially the same width and a depth of 1/2 or less of the rope cross-sectional area.
And this rope fitting groove | channel 10 'also forms the recessed part 100' recessed in the metal fitting thickness direction in the required range including the intermediate part, ie, the cross | intersection part of a rope.
[0018]
The recessed portion 100 ′ has a space in which one of the intersecting ropes 3, 3 ′ is locally bent in a direction perpendicular to the axial direction when tightened by the first fastener 8 and the second fastener 9. The width is the same as that of the rope fitting groove 10 'as in the case of the receiving metal fitting 6, but the depth is the deepest at the intersection and gradually shallower toward both sides. An arc shape is formed so that the maximum depth is about twice the depth of the rope fitting groove 10.
[0019]
On both sides near the outside of the rope fitting groove 10 ′, there are a through hole 12 through which the bolt neck as the first fastener 8 is inserted, and a through hole 14 through which the anchor bolt as the second fastener 9 is inserted. Each is provided.
[0020]
10 and 11 show a second embodiment of the fastener according to the present invention.
In this embodiment, one set of common fittings 7 'and 7' corresponding to the push fitting 7 of the first embodiment is used. That is, as shown in FIG. 11, each of the metal fittings 7 ′ and 7 ′ has a through hole 12 through which a bolt as the first fastener 8 is inserted and a second hole on both sides of the rope fitting grooves 10 and 10 ′. It has a structure provided with a through hole 14 through which an anchor bolt as the fastener 9 is inserted. Then, in order to fasten the bolt as the first fastening tool 8, a nut 8b is used as shown in FIG.
Since other configurations are the same as those of the first embodiment, the same portions are denoted by the same reference numerals, and the description thereof is omitted.
[0021]
FIG. 12 shows an embodiment in which the present invention is applied to the fastening of the intersecting portion of the intermediate rope 5 and the main rope 3, and the second fastener 9 'is not an anchor bolt but has the same configuration as the first fastener. A normal bolt is used and combined with the nut 9b. (A) uses the receiving metal fitting 6 and the push metal fitting 7 in the first embodiment, and (b) uses the common metal fittings 7 'and 7' in the second embodiment.
[0022]
What is shown is a few examples of the present invention and is not limited thereto.
1) The receiving metal fitting 6, the push metal fitting 7, and the common metal fittings 7 ′ and 7 ′ may not be a cast body such as cast steel, but may be a machined product or, depending on the case, a metal plate processed. 2) The through hole 12 for the anchor bolt of the receiving metal 6 may be a female screw hole, and the nut in the above embodiment may be omitted. Further, an anchor bolt may be fixed to the metal fitting 6 by welding or the like, and the nut in the above embodiment may be omitted.
Further, the screw shaft of the bolt may be fixed to the receiving metal fitting 6 by welding or the like, and this may be passed through the push metal fitting 7, and a nut may be screwed to the tip thereof to constitute a fastening tool.
3) The rope fitting grooves 10, 10 'may have a width that can accommodate several types of ropes. In that case, it is convenient to engrave a protrusion corresponding to the twist of the rope at the groove bottom. .
[0023]
[Effect of the embodiment]
Next, the usage and operation of the embodiment will be described.
In the first embodiment, as shown in FIG. 1, a receiving metal fitting 6 is arranged under the intersection of ropes 3 and 3 ′ that are stretched vertically and horizontally, and a pressing metal fitting 7 is placed from above. In this way, almost half of the cross section of the vertical rope 3 is fitted to the rope fitting groove 10 of the push fitting 7, and almost half of the cross section of the horizontal rope 3 ′ is fitted to the rope fitting groove 10 ′ of the receiving fitting 6. .
[0024]
Then, the bolt 8a as the first fastener 8 is screwed into the female screw hole 13 of the receiving metal 6 through the through hole 12 of the press fitting 7, and the anchor bolt as the second fastener 9 is passed through the press fitting 7. The lower part (anchor part) is buried in the ground by driving or the like through the hole 14 and the through hole 12 of the receiving metal fitting 6.
Thus, the fastener 4 including the ropes 3 and 3 ′ is fixed at a fixed position on the slope 1. In the middle of the anchor bolt 9, nuts 9 b and 9 b that can come into contact with the outer surface side of the receiving metal fitting 6 and the outer surface side of the pressing metal member 7 are screwed in advance.
[0025]
When the bolt 8a is tightened and one nut 9b is tightened in the above state, the receiving metal fitting 6 and the push metal fitting 7 come close to each other, and the portions exposed from the rope fitting grooves of the ropes 3 and 3 'are shown in FIG. As close as possible to the surface of the other metal fitting. And the rope fitting grooves 10 and 10 'crossed by the receiving metal 6 and the push metal 7 are less than 1/2 the depth of the rope cross section to be used, so that they are above and below the ropes 3 and 3'. The overlapping intersections 30 and 30 'are strongly pressed against each other by the tightening.
[0026]
In this portion, arc-shaped recessed portions 100 and 100 ′ that are deepest at the intersecting portion and gradually shallow toward both sides exist in an intersecting shape, and the maximum depth of these recessed portions 100 and 100 ′ is the depth of the rope fitting groove 10. Therefore, the intersecting portions 30 and 30 'are forcibly bent in the axial direction and the direction perpendicular to the shape of the recessed portions 100 and 100', respectively, as shown in FIGS. As described above, the intersecting portion 30 ′ of the vertical rope 3 ′ is pushed into the recessed portion 100 ′ of the receiving metal fitting 6, and the intersecting portion 30 of the horizontal rope 3 is pushed into the recessed portion 100 of the pushing metal fitting 7, and tightened in this state.
Since the intersections of the ropes 3 and 3 'are not simply pressed from the top and bottom, they are bent outwardly so as to become nodes, so that the ropes 3 and 3' are mutually enclosed. Sliding is completely prevented. Moreover, it can be realized with a relatively small tightening force. Then, the entire intersection is securely locked to the slope 1.
[0027]
The same effect can be obtained in the second embodiment, except that a nut 8b is arranged under the receiving-side metal fitting 7 'and screwed together when the bolt 8a is tightened.
The advantage of the second embodiment is that it is not necessary to manufacture two types of brackets, the receiving bracket 6 and the pressing bracket 7 as in the first embodiment, and it is only necessary to manufacture one type of bracket having the same configuration. is there. Therefore, the cost of the metal fitting can be reduced.
[0028]
The result of testing the fastening bracket of the present invention in actuality is as follows. The receiving bracket 6 and the pressing bracket 7 are made of cast steel (FCD450), length 95 mm, width 50 mm, thickness 16 mm, rope fitting groove depth 5 mm, and R7 mm. The maximum depth of the recessed portion was set to 11 mm and R33 mm.
[0029]
Two ropes having a 2 × 2 structure and a diameter of 12 mm were crossed with the fastening bracket and fastened with a fastening torque of 120 N · m.
In order to see the performance of the obtained fastening part, a tension load is applied to the rope in a state where the fastening bracket is fixed so as not to move, and the fastening force kN (resistance force that does not cause slippage at the intersection of the vertical rope and the horizontal rope) is applied. It was measured.
[0030]
For comparison, the same experiment was performed using a receiving metal fitting and a push fitting made of cast steel (FCD450) in FIG. 13B, having a length of 95 mm, a width of 50 mm, a thickness of 16 mm, and a rope fitting groove depth of 5 mm.
As a result, the fastening force of the product of the present invention was about 20 kN, the conventional product was about 8 kN, and it was confirmed that a fastening force more than doubled could be obtained with the same bolt fastening force. This is because the crossing portion of the rope is bent and sealed by the recessed portions 100 and 100 ′, and becomes a node and exhibits resistance to slip.
[0031]
【The invention's effect】
According to the first aspect of the present invention described above, the rope fitting groove 10 of the receiving metal fitting 6 has the recessed portion 100 at the intermediate portion, and the pressing metal fitting 7 that crosses the rope fitting groove 10 when facing the receiving metal fitting 6. Rope fitting groove 10 ′ has a recessed portion 100 ′ at an intermediate portion, and at these recessed portions 100, 100 ′, the rope intersecting portions 30, 30 ′ are bent in a direction perpendicular to the axial direction, and the intersecting portions are respectively recessed portions. Since it is pushed into 100, 100 ', it is possible to securely fasten the crossing portion of the rope without slipping with a small bolt tightening force, and the structure is simple and can be implemented at low cost. Excellent effect is obtained.
[0032]
According to the second aspect of the present invention, it is possible to obtain an excellent effect that the intersecting portion of the rope can be bent without difficulty and can be securely fastened without slipping.
According to the third aspect, since only one type of metal fitting needs to be manufactured, the metal fitting manufacturing cost can be reduced, and there is no female screw hole, and any metal fitting may be used as a receiving side or a pushing side. An excellent effect that handling can be facilitated is obtained.
[Brief description of the drawings]
FIG. 1 is a plan view showing a laying example of a rockfall prevention and landslide prevention net to which a rope crossing fastener according to the present invention is applied.
FIG. 2 is a side view showing the first embodiment of the rope crossing fastener according to the present invention in use.
FIG. 3 is a plan view of the same.
4 is a cross-sectional view taken along the line AB in FIG. 3;
5 is a cross-sectional view taken along line CD in FIG.
6 is a cross-sectional view taken along the line GH in FIG. 5. FIG. 7 is a perspective view showing a state of a crossing portion of ropes.
8A is a plan view of the metal fitting of the first embodiment, FIG. 8B is a cross-sectional view taken along the line E-F, and FIG. 8C is a cross-sectional view taken along the line J-K in FIG. FIG. 4D is a cross-sectional view taken along the rope fitting groove of FIG.
FIG. 9A is a plan view of the metal fitting of the first embodiment, and FIG. 9B is a cross-sectional view taken along line LM in FIG.
FIG. 10 is a side view showing the second embodiment of the rope crossing fastener according to the present invention in use.
FIG. 11 is a plan view showing a state in which the metal fitting of the second embodiment is disassembled.
12A is a side view showing a first example in which the present invention is used for fastening an intermediate rope at an intersection, and FIG. 12B is a side view showing a second example.
FIGS. 13A and 13B are side views showing a conventional rope crossing portion fastening bracket in use. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Slope 3, 3 'rope 4 Cross | intersection part fastening metal fitting 6 Receiving metal fitting 7 Push metal fitting 7' Common metal fitting 8 1st fastening tool 9 2nd fastening tool 10, 10 'Rope fitting groove 100, 100' Recessed part

Claims (3)

The receiving metal 6 and the pressing metal 7 each formed on the inner surface with a single rope fitting groove 10, 10 'that intersects when arranged relative to each other, and the fastening tools 8 and 9 for tightening the receiving metal 6 and the pressing metal 7. In the rope crossing portion fastening bracket, the rope fitting groove 10 of the receiving metal fitting 6 has a recessed portion 100 at an intermediate portion, and the pressing metal fitting that crosses the rope fitting groove 10 when facing the receiving metal fitting 6. 7 rope fitting groove 10 'has a recessed portion 100' at an intermediate portion, and at these recessed portions 100, 100 ', the rope intersecting portions 30, 30' are bent in a direction perpendicular to the axial direction, and the intersecting portions are respectively recessed. Fastening fitting for a rope crossing portion, which is pushed into the insertion portion 100, 100 ′. 2. The rope according to claim 1, wherein the recessed portion 100 is formed so that the intersection portion is deepest and gradually becomes shallower toward both sides, and the maximum depth is about twice the depth of the rope fitting grooves 10, 10 ′. Fastening bracket for intersection. The rope crossing portion fastening bracket according to any one of claims 1 and 2, including a member in which the receiving bracket and the pressing bracket are composed of common brackets 7 'and 7' having the same configuration.

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