JP2006161987A - Fastener for rope crossing portion - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fastener for a rope crossing portion capable of preventing the lowering of torque, achieving stable fastening force, and easily visually confirming introduction of torque. <P>SOLUTION: In this fastener comprising a receiving fitting 1 and a pressing fitting 2 mounted in opposition to each other and respectively provided with crossed fitting grooves 10, 11 on their inner faces, and first and second fastening tools 3, 4 mounted at outer positions of both sides of the rope fastening grooves 10, 11 for fastening the receiving fitting 1 and the pressing fitting 2, a plurality of projecting portions 12 kept into contact with the inner face of the mating fitting in setting, are formed at intervals on one or both inner faces of the receiving fitting 1 and the pressing fitting 2, to control a torque value and fastening force. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an improvement of a metal fitting suitable for fastening an intersecting portion of ropes crossed and stretched.

  On slopes along roads, a method of laying a rope in a net shape along the surface of the ground is generally used to prevent falling rocks and landslides. In implementing this method, A structure in which the clamp is divided into two parts by pressing or casting a plate material to form a groove having a semicircular cross section and a pressing metal fitting having a cross-shaped groove formed by pressing or casting. It has been.

  In the case of such a clamp method, the required fastening force of the metal fitting to be used is required to be 1/3 or more of the breaking load of the rope. The cross rope portions overlap each other in a state where the half is fitted, and the cross rope portions are pressed against each other by being tightened by screwing of bolts and nuts.

  For this reason, the frictional force between the ropes and the rope and metal fittings cannot be secured, and a sufficient fastening force that does not cause slippage at the intersection of the ropes cannot be obtained. There is a risk that the effect of will not be fully achieved.

As measures against this, the applicant of the present invention has adopted a receiving metal fitting and a holding metal fitting which are arranged opposite to each other and each formed a cross-shaped (cross-shaped) rope fitting groove, and a rope fitting groove for tightening the receiving metal fitting and the holding metal fitting. A rope crossing fastener having a first and a second fastener disposed at both outer positions is proposed.

According to this fastening bracket, there is an advantage that the crossing portion of the rope can be fastened without slipping, but the bolts as the first and second fastening tools are fixed with a certain torque so as to secure the rope fastening force. When tightened, the torque tended to decrease with time.
If the torque decreases in this manner, it will be difficult to prove the introduction torque at the time of tightening the rope at a later date, and the influence on the fastening force will be questioned. Therefore, in the past, torque was introduced at an extra value of about 20 to 30%, and it was necessary to confirm the torque value after a while. In addition, when excessive fastening force is introduced, the deformation of the rope is large and there is a risk of damaging the rope.
JP-A-2003-206535

  The present invention has been made in order to solve the above-described problems. The object of the present invention is to prevent torque reduction and to obtain a stable fastening force, so that it is easy to visually confirm the introduction of torque. An object of the present invention is to provide a fastener for crossing a rope.

  In order to achieve the above-described object, the rope crossing joint fastener according to the present invention is provided with a receiving metal fitting and a pressing metal that are arranged opposite to each other and formed with crossed rope fitting grooves on the inner surface, and for fastening the receiving metal fitting and the pressing metal. A metal fitting having first and second fasteners arranged on both sides of the rope fitting groove on the inner surface of one or both of the receiving metal fitting and the push metal fitting, and the inner surface of the mating metal fitting when set. It is characterized in that a plurality of convex portions in contact with is provided at intervals.

The present invention relates to a receiving bracket and a press fitting that are arranged opposite to each other and each formed with a crossed rope fitting groove on the inner surface, and a first that is arranged on both sides of the rope fitting groove to fasten the receiving fitting and the pressing fitting. And the second tightening tool, the rope crossing portion can be fastened without slipping with a small tightening force.
Moreover, with this type of conventional metal fitting, the receiving metal and the metal fitting do not come into contact with each other during tightening, and the introduction torque value during the tightening work was obtained by the shape repulsive force (including the cross section) of the wire rope. Has a plurality of protrusions that are in contact with the inner surface of the mating metal fitting at the time of setting. As specified, excessive deformation of the rope does not occur. Therefore, there is no variation in the torque value depending on the skill level of the operator, a stable fastening force can be obtained, a torque drop can be prevented, and the deformation of the wire rope can be reduced. In addition, by observing the protrusion after fastening, if it is in contact with the inner surface of the counterpart metal fitting, it is a proof that the proper torque has been introduced, so the inspection becomes easy.

Preferably, the number of convex portions is two to four, and they are arranged in the vicinity of the rope fitting groove and on one side and the other side in the width direction of the groove.
According to this, if the convex part is in contact with the inner surface of the other metal fitting, it will prove that the specified torque has been introduced, and the visual check can be performed instantly from any direction, so construction management confirmation is easy. It is. In addition, since the convex part is arranged in the vicinity of the rope fitting groove and on one side and the other side in the width direction of the groove, the behavior of the rope trying to escape from the cross shape to the parallel shape at the time of tightening is also prevented. Can do.

  Of the rope fitting grooves, one rope fitting groove has a substantially uniform depth over the entire length, and the other rope fitting groove has a recessed portion that allows bending of the crossed rope portion in a direction perpendicular to the axial direction. ing. According to this, since the crossing portions overlapping the top and bottom of the rope are strongly pressed so as to mesh with each other and can be bent and sealed, the crossing portion of the rope can be fastened without slipping. .

Embodiments of the present invention will be described below with reference to the drawings.
1 to 4 show an example in which the present invention is applied to the fastening of wire rope intersections in a rope net, and the symbol A indicates the whole fastening bracket for intersections (hereinafter referred to as a fastening bracket) of the present invention. The ropes R and R ′ extending in the direction and the left-right direction are fastened.
The fastening bracket A includes an opposing receiving bracket 1 and a pressing bracket 2, and ropes R and R ′ are sandwiched therebetween in an orthogonal shape, and the left and right first fastening tools 3 and 2 are located at positions avoiding this. By tightening the receiving metal 1 and the pressing metal 2 with the tightening tool 4, the crossing portion of the rope is fastened. The first fastener 3 is a bolt in this example, and the second fastener 4 is an anchor bolt 4a and a nut 4b in this example.

FIG. 5 and FIG. 6 show the receiving metal fitting 1 in a single state, which is composed of a cast board body having a substantially elliptical or oval shape in a plane, and has a rope fitting groove intersecting in an X shape (cross shape) on the inner surface. 10 and 11 are formed to reach the edge.
One rope fitting groove 10 of the rope fitting grooves 10 and 11 has a recessed portion 100 that extends moderately on both sides including the rope intersection at the bottom of the intermediate region. The other rope fitting groove 11 does not have the recessed portion 100, has the same depth over the entire length, and communicates with the recessed portion 100 in such a manner that the intermediate region is divided by the recessed portion 100.

The recessed portion 100 is for allowing the crossed rope portion to be bent in a direction perpendicular to the axial direction and containing the bent portion at the time of fastening by the first fastening tool 3 and the second fastening tool 4, The width is the same as that of the rope fitting groove 10, but the depth is the deepest at the intersecting portion and is formed so as to gradually become shallower toward both sides, and the depth of the deepest part is the depth of the rope fitting groove 10. About twice as much.
On both sides near the outside of the rope fitting grooves 10, 11, there are a through hole 14 for inserting an anchor bolt as the second fastener 4 and a female screw hole 13 for screwing a bolt as the first fastener 3. Each is provided.

FIG. 7 shows a metal fitting 2, which is made of a cast board body having a substantially elliptical or oval shape on the plane, and rope fitting grooves 10, 11 intersecting in an X shape (cross shape) on the inner surface. It is formed to reach.
The rope fitting groove 10 forms a passage having a substantially elliptical cross section by forming a pair with the rope fitting groove 11 of the metal fitting 1 when the metal fitting 2 and the inner surface are brought into contact with each other when the metal fitting 2 is reversed. . Further, the rope fitting groove 11 forms a passage having a substantially elliptical section by forming a pair with the rope fitting groove 10 of the receiving metal 1 when the pressing metal 2 is reversed and brought into contact with the receiving metal 1.

  The rope fitting grooves 10 and 11 have an arc shape having a width substantially equal to the ropes R and R ′ to be used and a depth moderately shallower than a half of the rope cross section. It has the recessed part 100 extended moderately on both sides including a cross | intersection part. The other rope fitting groove 1 does not have the recessed portion 100 and communicates with the recessed portion 100 in such a manner that the inner end is divided by the recessed portion 100.

The recessed portion 100 allows the crossed rope portions 30 and 30 to bend in a direction perpendicular to the axial direction when the first and second fasteners 3 and 4 are tightened, and contains the bent portions. However, the width is the same as that of the rope fitting groove 10, but the depth is the deepest at the intersection, and is formed in an arc shape so as to gradually become shallower toward both sides, and the maximum depth is the depth of the rope fitting groove 10. About twice as much.
On both sides near the outside of the rope fitting grooves 10, 11, a through hole 15 through which the bolt neck as the first fastener 3 is inserted, and a through hole 14 through which the anchor bolt as the second fastener 4 is inserted. Are provided.

In the present invention, the first fastening tool 3 and the second fastening tool 2 are sandwiched between at least one inner surface of the receiving metal fitting 1 and the holding metal fitting 2 with the ropes R and R ′ sandwiched between the receiving metal fitting 1 and the pressing metal fitting 2. A plurality of convex portions 12 that are brought into contact with the inner surface of the counterpart metal fitting when tightened by the fastening tool 4 are provided at intervals. The arrangement position is preferably a position close to the periphery in order to facilitate visual recognition from the outside and to prevent parallelization of the rope.
The height of the convex portion 12 is usually set to about 1/4 to 1/5 of the rope diameter.
Usually, the convex portion 12 is cast integrally with the metal fitting, but depending on the case, it is obtained by casting a boss and press-fitting a pin into the boss, or by forming a female screw on the boss and screwing a screw. Or you may.

In this embodiment, the convex portion 12 is provided on the receiving metal 1, and the tip is brought into contact with the inner surface of the pressing metal 2.
In this example, there are two protrusions 12, one on the left outer side in the width direction at a position near the opening of the rope fitting groove 11, and one on the right outer side in the width direction at a position near the opening opposite to the rope fitting groove 11. Yes.
Instead of this, one may be provided on the right outer side in the width direction at a position near the opening of the rope fitting groove 10, and another one on the left outer side in the width direction at a position near the opposite opening of the rope fitting groove 10. Absent.

8 and 9 show a second embodiment of the present invention.
In this embodiment, the convex portion 12 is provided on the inner surface of the press fitting 2, and the tip is brought into contact with the inner surface of the receiving fitting 1 when set and tightened.
In this example, one is provided on the right outer side in the width direction at a position near the opening of the rope fitting groove 10, and one is provided on the left outer side in the width direction at a position near the opening opposite to the rope fitting groove 10. Instead of this, one may be provided on the left outer side in the width direction at a position close to the opening of the rope fitting groove 11, and another one on the right outer side in the width direction at a position near the opposite opening of the rope fitting groove 11. .
Since the other configuration is the same as that of the first embodiment, the description is incorporated.

10 and 11 show a third embodiment of the present invention.
In this embodiment, there are four convex portions 12, and two are provided in each of the rope fitting grooves 10, 11 in the metal fitting 1. Specifically, one is provided on the left outer side in the width direction at a position close to the opening in the width direction of the rope fitting groove 10, and one is provided on the right outer side in the width direction at a position near the opposite opening. Further, another one is provided on the left outer side in the width direction at a position near the opening in the width direction of the rope fitting groove 11 on the right outer side in the width direction at a position near the opposite opening.
Since the other configuration is the same as that of the first embodiment, the description will be used, and the same reference numerals will be given to the same portions.
In addition, you may provide the convex part 12 in the press metal fitting 2 side like 2nd Example.

In addition, what is illustrated is a few examples of this invention, and is not limited to these.
1) The metal fitting 1 and the metal fitting 2 may be a cut product instead of a cast body, or may be a sheet metal machine depending on the case. In these cases, the convex portion 12 is made as a separate part, and is integrated with the receiving metal fitting 1 or the pressing metal fitting 2 by press fitting, screwing, welding or the like.
2) In some cases, the convex portion 12 may be provided on both of the receiving metal fitting 1 and the pressing metal fitting 2. In this case, when there are two convex portions 12, one convex portion is received on the metal fitting 1. May be provided on the press fitting 2. When the number of the convex parts 12 is four, the two convex parts may be provided on the metal fitting 1 and the other two convex parts may be provided on the pressing metal 2.

2) The first fastening tool 3 and the second fastening tool 4 can adopt various modes.
The through hole 14 of the catch 1 may be a female screw hole, and the nut in the above embodiment may be omitted. Moreover, the anchor bolt as the fastener 4 may be fixed to the metal fitting 1 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 1 by welding or the like, and this may be passed through the pressing metal fitting 2, and a nut may be screwed to the tip thereof to constitute a fastening tool.
Both the first fastener 3 and the second fastener 4 may be of a type using bolts and nuts. In that case, what is necessary is just to let the 1st fastener 3 be a through-hole which penetrates a volt | bolt instead of a female screw hole.

3) The receiving metal 1 and the pressing metal 2 can also take various forms.
When the diameters of the ropes R and R ′ to be used are medium (usually up to about 12 mm), as shown in FIGS. 1 to 7, the rope fitting grooves 10, from the axis of the first fastener 3 (the center of the hole 13), 11 to the intersection CL and the distance from the axis of the second fastener 4 (the center of the hole 14) to the intersection CL of the rope fitting grooves 10, 11 may be substantially the same, but the rope R, When the diameter of R ′ is larger than, for example, 14 mm, the lengths of the receiving metal fitting 1 and the holding metal fitting 2 are made larger than those in the first and second embodiments, and the axis (hole) of the second fastening tool 4 is increased. 14) to the intersection of the rope fitting grooves 10, 11 and the distance L2 from the axis of the first fastener 3 (center of the hole 13) to the intersection of the rope fitting grooves 10, 11 are not equal. , The distance L1 is larger than the distance L2, and usually the distance L1 / distance L The may be about 1.5 to 2.

Next, the usage and operation of the embodiment will be described.
The anchor part fixed to the upper part of the anchor bolt is buried in the ground for the required length by driving or the like. And the receiving metal fitting 1 is arranged under the crossing part of the ropes R and R 'stretched vertically and horizontally on the ground surface portion, and the pressing metal fitting 2 is covered from above. In this way, the ropes R and R ′ each have a cross shape, and the required range of the cross section is fitted into the rope fitting grooves 10 and 11 that are elliptical when they are combined.

  Then, the bolt 3a as the first fastening tool 3 is screwed into the female screw hole 13 of the receiving metal fitting 2 through the through hole 15 of the press fitting 2, and the anchor bolt 4a as the second fastening tool 4 is passed through the push fitting 2. The hole 14 and the through-hole 14 of the receiving metal fitting 6 are penetrated. Thus, the ropes R, R ′ and the rope crossing portion fastening bracket A are fixed at a fixed position on the slope. In the middle of the anchor bolt 4a, nuts 4b and 4b that can come into contact with the outer surface side of the receiving metal fitting 1 and the outer surface side of the pressing metal fitting 2 are screwed in advance.

  In the above state, when the bolt 3a is tightened and one nut 4b is tightened, the receiving metal 1 and the pressing metal 2 come close to each other. Since the rope fitting grooves 10 and 11 have a depth that is 1/2 of the cross section of the ropes R and R ′ to be used or a depth shallower than that, the intersecting portions r and r overlapping the ropes R and R ′. Press strongly to engage each other.

In this portion, arc-shaped recessed portions 100, 100 that are deepest at the intersecting portion and gradually become shallower toward both sides exist in the intersecting manner with the receiving metal fitting 1 and the pressing metal 2, and these recessed portions 100, 100 have a maximum depth. Since the depth of the rope fitting groove 10 is about twice, the intersecting portions r and r are bent and deformed in the direction perpendicular to the axial direction according to the shape of the recessed portions 100 and 100 by the pressing, and FIG. As shown in FIGS. 1 and 2, the upper and lower recessed portions 100 and 100 are forcibly pushed and fastened as shown in FIGS.
The intersections of the ropes R, R ′ are not only pressed from above and below, but are bent outwardly and are enclosed in the recessed portions 100, 100. Slip is completely prevented. At the same time, since the meshing of the intersections of the ropes R and R ′ is improved, the contact surface is further increased and the friction between the ropes is increased. And the whole intersection part is reliably latched by the slope.
Further, since the portions ahead of the intersections r and r of the ropes R and R ′ are also in close contact with the upper and lower rope fitting grooves 10 and 11, the fastening force can be obtained by friction also in this portion, and the right-angled intersection form can be obtained. Is formed, and the left and right shift is prevented.

Moreover, in the first embodiment, the protrusions 12 and 12 extend from the inner surface of the metal fitting 1, and in the second embodiment, the protrusions 12 and 12 extend from the inner surface of the pressing metal 2 and the bolt 3a. The protrusions 12, 12 come into contact with the inner surface of the metal fitting 2 or the receiving metal 1 by the lowering of the metal fitting 2 accompanying the introduction of torque to the nut 4 b. Therefore, the required fastening force can be obtained in a well-balanced form in which the receiving metal 1 and the pressing metal 2 are close to each other in equilibrium, and when the convex portion comes into contact with the inner surface of the mating metal, the distance between the receiving metal 1 and the pressing metal 2 The excessive deformation of the rope is also restricted.
Therefore, even when excessive torque is introduced, deformation of the rope is reduced, and the introduced torque is converted from a repulsive force due to a change in the shape of the rope to abutment on the inner surface of the mating metal part of the convex portion 12. Thus, a constant and stable fastening force can be obtained, and a torque reduction phenomenon associated with the transition from elastic deformation to plastic deformation of the rope can be avoided. And since the contact | abutting with the other party metal fitting inner surface of the said convex part 12 can be easily visually recognized from the outside, the introduction torque value at the time of a test | inspection can be easily proved by acquiring a test result beforehand.
In addition, since the second embodiment is flat without the convex portion 12 on the upper surface of the receiving metal fitting 1, when setting it below the rope crossing portion, it does not collide with the rope being stretched, and the work can be performed. There is also the advantage of being easy.

The results of testing the rope crossing fastener of the present invention on the ground are shown using the structure shown in the first embodiment, and the receiving metal and the pressing metal are made of cast steel (FCD450), length 95 mm, width The specifications are 50 mm, thickness 16 mm, rope fitting grooves 10, 11 depth 5 mm, R7 mm, and recessed portion 100 maximum depth 11 mm, R33 mm.
There are two protrusions (first example) arranged as shown in FIG. 2 and four (second example) arranged as shown in FIG. 8, each having a height of 3 mm and integrally cast on the metal fitting. did.

  Two ropes having a diameter of 2 × 2 and a diameter of 12 mm were crossed and fastened to the rope crossing fastener. In this test, bolts (nominal diameter M16) and nuts were used as the first fasteners, and bolts (nominal diameter M20) and nuts were used as the second fasteners, not the anchor bolts. A tension load was applied to the rope in a state where the fastening bracket for movement was fixed so as not to move, and the fastening force (resistance force that does not cause slippage at the intersection of the vertical rope and the horizontal rope) kN was measured. Moreover, the torque when a convex part contacted the other party metal fitting was measured.

For comparison, the same experiment was performed using a receiving metal fitting and a pressing metal having the above specifications, but not using a protrusion (comparative example). In this case, the torque measurement was performed with a torque wrench because the receiving metal and the pressing metal were not in contact with each other.
As a result, the fastening force of the first example and the second example was a screw nominal diameter M16: 29 kN, a screw nominal diameter M20: 30 kN, and the fastening force of the comparative example was 29 kN.
The torque values were M16: 140 N-m and M20: 180 N-m in both the first example and the second example, and there was no change even if the time was measured thereafter. On the other hand, in the comparative example, M16: was 140 Nm and M20: was 180 Nm, but as time passed, M16: decreased to 120 Nm and M20: decreased to 161 Nm.
From this result, it is clear that a decrease in torque value over time can be prevented by providing a convex portion and bringing it into contact with the counterpart metal fitting. In addition, the certainty of the contact of the convex part with the mating metal fitting was better in the first example.

It is a top view which shows the state which applied the 1st Example of the fastener for rope crossing parts by this invention. It is the side view seen from the arrow direction of FIG. It is sectional drawing which follows the III-III line of FIG. It is sectional drawing which follows the IV-IV line of FIG. It is a top view of the metal fitting of 1st Example. (a) is sectional drawing which follows the LM line of FIG. 5, (b) is sectional drawing which follows the JK line of FIG. 5, (c) is sectional drawing which follows the QR line of FIG. (a) is a top view of the metal fitting of 1st Example, (b) is the sectional drawing. The 2nd Example of the fastening metal fitting for rope crossing parts by this invention is shown, and it is a top view of a receiving metal fitting. It is a top view of the metal fitting of 2nd Example. It is a top view which shows 2nd Example of this invention. It is a top view of the receiving metal fitting in 2nd Example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Receiving metal fitting 2 Pushing metal fitting 3 1st fastening tool 4 2nd fastening tool 10,11 Rope fitting groove 12 Convex part 100 Concave part

Claims (3)

Receiving metal fittings 1 and pressing metal fittings 2 which are arranged opposite to each other and have crossed rope fitting grooves 10 and 11 formed on the inner surfaces thereof, and the outer sides on both sides of the rope fitting grooves 10 and 11 to fasten the receiving metal fittings 1 and the metal fittings 2. A metal fitting provided with first and second fasteners 3 and 4 arranged at positions, and is in contact with the inner surface of one or both of the receiving metal fitting 1 and the push metal fitting 2 and the inner surface of the mating metal fitting when set. A rope crossing fastener, wherein a plurality of protrusions 12 are provided at intervals.   The fastening member for a rope crossing portion according to claim 1, wherein the convex portion 12 has two to four, and is disposed in the vicinity of the rope fitting grooves 10 and 11 and on one side and the other side in the width direction of the groove. One of the rope fitting grooves 10 and 11 has a substantially uniform depth over the entire length, and the other rope fitting groove 10 is bent in a direction perpendicular to the axial direction of the crossed rope portions 30 and 30. The rope crossing fastener according to claim 1 or 2, further comprising a recessed portion (100) that allows the insertion.

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