JP2649891B2 - Shock absorbing fence - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shock absorbing fence used for a rock fall prevention fence or a guard rope.

[0002]

2. Description of the Related Art A shock absorbing fence used for small- and medium-scale rockfall prevention means has a steel column erected on a hillside at a predetermined interval, and a large number of rope members are laid in a multistage manner between the columns. It is configured. It has a mechanism to attenuate the impact energy held by rockfalls by the rigidity of the columns and the tensile strength of the rope material.

[0003]

[Problems to be solved by the present invention] The above-mentioned shock absorbing fence has the following problems. <B> Since the rope material is fixed to the support via the fixing device, the impact energy is concentrated on the fixing portion between the rope material and the support, and the fixing device is easily damaged.

<B> Although the impact absorbing fence is designed to have a strength that can withstand the expected impact energy, there is a limit to the impact energy that can be countered. Therefore, if an unexpected impact exceeding the tensile strength of the rope material acts, the rope material breaks and no energy damping action can be expected, and there is an uneasiness in reliability of the shock absorbing fence.

<C> Methods of improving the energy attenuation efficiency include, for example, increasing the number of rope members laid between the columns, using a high-strength rope material or columns, and using a plurality of sets of impacts. A method of arranging absorption fences along the slope can be considered. However, all of these methods have high construction costs and are not feasible.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and it is an object of the present invention to provide a shock absorbing technology capable of improving shock energy damping efficiency and improving safety reliability. The purpose is to provide.

[0007]

That is, the present invention is directed to a shock absorbing fence constructed by horizontally extending a rope material between columns that are erected at intervals, and two columns are arranged on adjacent columns. Attach the main shock absorber that grips the middle of the rope material,
The main shock absorbing device of each of the struts overlapped the two rope members in the middle of the rope material and sandwiched them, and attached an end stopper for restraining the rope material from slipping over the extra length of each of the overlapped rope members, and then polymerized. A sub-shock absorbing device is provided for gripping between the main shock absorbing device and the end stopper of each rope material, and the rope is applied when the main shock absorbing device and the sub shock absorbing device exert a tension less than the tensile strength of the rope material. Gripping with a clamping force that allows sliding with the material, so that the tension of the rope material and the bending force of the strut can be transmitted to each other when the end stopper, the sub shock absorber, and the main shock absorber come into contact with each other. It is a shock absorbing fence characterized by the following.

[0008]

An embodiment of the present invention will be described below with reference to the drawings. <A> Overall Structure of Shock Absorbing Fence FIG. 1 shows a front view of the entire shock absorbing fence, and FIG. 2 shows a side view thereof. The shock absorbing fences are columns 1 erected at regular intervals, main shock absorbers 2 attached to the columns 1 in multiple stages, and ropes extending between the columns 1, 1 via the main shock absorber 2. Material 3, an end stopper 4 that straddles the superimposed rope material 3, and is fixed to an end portion (excess length portion 31) of one of the rope materials 3, and a main impact of each superimposed rope material 3. It comprises a sub-impact absorbing device 5 that grips between the absorbing device 2 and the end stopper 4.

As shown in FIG. 2, the strut 1 is connected to one end of the mooring rope 6, and the other end of the mooring rope 6 and the U-bolt 61 are overlapped to form an impact absorbing device 7 for an anchor. And the U-bolt 61 is installed on the ground with the anchor 62.

<B> Support (FIG. 3) The support 1 is made of unbonded PC steel 1 in a steel pipe 11.
2 is a rigid member manufactured by filling concrete 13 in a steel pipe 11 while installing the same.

The PC steel material 12 is arranged on the tension side of the column 1,
Each PC steel material 12 is fixed at both ends without introducing tension at the time of manufacturing, and when a bending force is applied to the column 1, the PC steel material 1
2 so that tension is introduced.

<C> Main Shock Absorbing Device (FIG. 3) The main shock absorbing device 2 is a member that grips two rope members 3 and 3 and attaches them to the column 1. A body 22 having accommodating grooves 21 and 21 recessed in parallel,
A plurality of clamps 2 for simultaneously clamping two rope members 3, 3
3

The main body 22 includes a plurality of through holes 24 formed on a ridge extending over both the grooves 21 and 21 and a pair of guide grooves 25 formed on the open side of the main body 22 so as to face each other. Have
The through-hole 24 has a bolt portion 23 a of the holding member 23 inserted therein, and the guide grooves 25, 25 are set to dimensions that can fit the substantially triangular wedge 23 b of the holding member 23.

If a large number of linear (points intersecting with the groove direction) or point-like projections are formed on the inner peripheral surfaces of the accommodating grooves 21 and 21, the sliding resistance with the rope material 3 is increased. Can be achieved.
The inclined side surfaces of the wedge body 23b constituting the holding member 23 are formed as holding surfaces 23c, 23c for directly gripping the rope members 3, 3, and the holding surfaces 23c, 23c are formed as curved surfaces or straight surfaces that curve inward. I do.

The clamping force (sliding resistance) of the rope material 3 is determined by the fastening force of the nut 23d screwed to the bolt portion 23a of each of the clamping members 23. Set a value smaller than the breaking strength. The main shock absorber 2 is attached to the column 1 via a U-bolt 14 and a nut 15, or is attached to the column 1 by welding.

<D> Rope material (FIG. 1) The rope material 3 is made of a wire rope or PC strand, and is horizontally laid between the columns 1 via the main shock absorbing device 2. It is important that the total length of each rope material 3 is set to be longer than the distance between the plurality of sets of columns 1 and 1 to be horizontally mounted. This is because when the two rope members 3 and 3 are superimposed and gripped by the main shock absorbing device 2, an extra length portion 31 is provided at the end of each of the rope members 3 and 3 exceeding the main shock absorbing device 2. It is for forming.

<E> End stopper (FIGS. 1, 4 and 5) The end stopper 4 regulates the sliding of each rope member 3 in the main shock absorbing device 2, and transmits a force between both the rope member 3 and the column 1. As shown in FIG. 1, the member straddles the two rope members 3, 3 held by one main shock absorber 2, and the extra length portion 31 of one of the rope members 3 It is fixed and set in a movable state with respect to the other rope material 3.

The end stopper 4 illustrated in FIGS. 4 and 5 will be described. The gripping stopper 4 is formed integrally with a fixed cylinder 41 through which the extra length 31 of one of the rope members 3 is inserted, and Half-cylinders 42, 42 slidably moored to the other rope member 3, and a substantially triangular pyramid-shaped pressing tool 4 inserted into the fixed cylindrical body 41 and fixing the extra length 31 of the other rope member 3.
3.

The fixing cylinder 41 has a tapered gripping hole 4 inside.
A plurality of engaging grooves 44a are formed in the large diameter side of the holding hole 44 along the longitudinal direction of the cylindrical body 41, and a tapered square hole 44b is formed in the small diameter side.

The substantially triangular pyramid-shaped pressing member 43 has a plurality of projections 43a which are fitted on the engaging groove 44a on the large-sized peripheral surface, and the small-sized rotating member 44b rotates inside the 44b. Is formed in a triangular cross section so as to restrain the
A groove 4 capable of accommodating the strand of the extra length 31 in each corner of 3
3b.

The extra length 31 of one of the rope members 3 is inserted from the small diameter side to the large diameter side of the gripping hole 44 of the fixed cylindrical body 41, and the insertion side is displaced, and the pressing tool 43 is placed at the center thereof. The wedge can be fixed by being pushed in and inserted into the holding hole 44.

Each half cylinder 42 has a diameter larger than the diameter of the rope material 3 so as to allow the other rope material 3 to slide, and the directions thereof are opposite to each other.

The end stopper 4 is not limited to the illustrated one, but any member may be used as long as the extra length 31 of one of the rope members 3 can be fixed so as not to fall out of the main shock absorbing device 2.

<F> Sub-shock absorbing device (FIGS. 6 and 7) FIGS. 6 and 7 show a box-type sub-shock absorbing device 5 which sandwiches the rope material 3 and the extra length 31. FIG.

The box 51 is provided with the rope material 3 to be attached.
Insertion holes 51a, 51 for horizontally inserting
a, and a plurality of through holes 51b penetrating the box body 51 in the up-down direction in a staggered manner.

As shown in FIG. 7, the insertion hole 51a and the through hole 51b are communicated with each other, and a mounting hole 51c for the holding tool 52 is further formed on one end surface of the box body 51. The mounting hole 51c is inserted into the insertion hole 51c. 51a and the through hole 51b.

The holding tool 52 inserted into the mounting hole 51 is a substantially L-shaped member having a screw portion 52a and a holding surface 52b.
The holding surface 52b is a concave or linear tapered surface formed toward the screw portion 52a.

The rope member 3 is inserted into the insertion hole 51a of the sub shock absorbing device 5, and the holding member 52 is attached to the mounting hole 51c.
The nut 53 is screwed and fixed to a screw portion 52a that is fitted inside the screw hole and protrudes from the through hole 51b.

Each of the holding tools 52 has a holding surface 52b which is low.
It is arranged in the direction in which it comes into contact with the packing material 3. As a result,
The buckle material 3 is held between the holding surface 51d of the insertion hole 51a and the holding surface 52b of the holding tool 52 and mounted.

The pinching force (sliding resistance) of the rope member 3 is determined by the fastening force of a nut 53 screwed into the threaded portion 52a of each of the pinching members 52. Is set to a value smaller than the breaking strength of

<G> Shock absorber for anchor (FIG. 2,
8, 9) The shock absorbing device 7 for the anchor is similar to the sub shock absorbing device 5 described above, and the mooring rope insertion hole 7 is provided in the horizontal direction of the box 71.
1a, a through hole 71b is provided in a direction intersecting with 1a, and a mounting hole 71c of the holding device 72 is provided so as to communicate with each other. The holding tool 72 has a similar structure including a screw portion 72a and a holding surface 72b.

Then, the mooring rope 6 is inserted into the insertion hole 71a, the holding tool 72 is mounted through the mounting hole 71c, and the nut 73 can be screwed and set. In addition, two parallel U-bolt insertion holes 71d penetrate the anchor shock absorbing device 7 on both sides of the mooring rope insertion hole 71a.

As shown in FIG. 2, a U-bolt 61 is inserted into the U-bolt insertion hole 71d, a penetrating end of the U-bolt 61 is fixed with a nut, and the U-bolt 61 is installed on the ground surface with an anchor 62. One end of the mooring rope 6 is on the column 1, and the other end is the anchor as described above.
Between the shock absorbers for use.

[0034]

Next, the shock absorbing function will be described. In addition,
In the description, the elongation of the rope material 3 will be ignored and described. <a> At the time of an impact action on the rope material The impact force applied to the rope material 3 due to factors such as falling rocks or collision of a traveling vehicle is transmitted to the main shock absorber 2 via the rope material 3.
Conveyed to.

When the tension applied to the holding portion of the rope material 3 is equal to or less than the holding force, the tension applied to the holding portion of the rope material 3 is supported by the tensile strength of the rope material 3 and the rigidity of the column 1. When the force exceeds the holding force of the rope material 3, the rope material 3 starts sliding in the direction of the tension while shortening the distance of the extra length portion 31, and the impact energy is reduced due to the frictional resistance at the time of sliding.
Attenuate. In this case, the frictional resistance can be obtained from both the main shock absorber 2 and the sub shock absorber 5.

The amount of impact energy attenuation due to sliding of the rope material 3 is determined by the total length of the extra length 31. When the gripping stopper 4 collides with the sub shock absorber 5 and the sub shock absorber 5 collides with the main shock absorber 2, the rope material 3
Is prevented, and as a result, the impact force acting on the rope material 3 is transmitted to the column 1 and is supported by the rigidity of the column 1.

When the impact energy exceeds a certain value, the support 1
Starts deforming, and the effect of damping the impact energy due to the deformation of the column 1 proceeds. At this time, a prestress is introduced into the PC steel material 12 in the support 1 with the deformation of the support 1, so that the impact energy can be efficiently attenuated.

Further, since the end stopper 4 restricts the rope material 3 from coming out of the main shock absorbing device 2, the rope material 3 gripped by the deformed strut is pulled, and as a result, the adjacent strut 1 Also in the main and sub shock absorbers 2 and 5, the rope material 3 slides, and a damping action of the shock energy occurs in a chain.

<B> At the time of impact on the column Next, the case where an impact force is applied to the column 1 will be described. The above-described effect of damping the impact energy due to the deformation of the column 1 proceeds. Tension acts on the rope material 3 with the deformation of the column 1, and the above-described impact energy damping action due to the sliding of the rope material 3 proceeds in parallel.

In practice, an impact force acts on both the rope member 3 and the support 1, respectively. In this case, the impact energy damping action is basically based on the above-described damping mechanism. When the rope material 3 is to be restored, the rocking device 23 is removed after removing the falling rock or the vehicle, and the predetermined extra length 31 is again removed.
And secure the rope material 3 again.

<C> Absorbing action of the impact absorbing device for anchor The above is the case where the impact at the time of collision of a falling rock or a vehicle is absorbed in the direction perpendicular to the direction of collision.
Shock absorbing device 7 can absorb a shock in a collision direction of a collision object. That is, the rope material 3 or the support 1 may be deformed forward by the collision of the collision object.

At this time, when the tension acting on the holding portion of the mooring rope 6 of the shock absorbing device 7 for anchor is less than the holding force, the mooring rope 6 is supported by the tensile strength. When the clamping force exceeds 6, the mooring rope 6 starts sliding in the direction of the tension, and the impact energy can be attenuated by the frictional resistance during the sliding.

The extra length 63 of the mooring rope 6 is made sufficiently long so as not to come off. As mentioned above,
The impact absorbing fence of the present invention can absorb the impact at the time of a collision such as a falling rock or a vehicle in a direction orthogonal to the collision direction by the main impact absorbing device 2 and the sub impact absorbing device 5 and can also be impacted by the anchor impact absorbing device 7. Since the impact can also be absorbed in the direction, the impact due to the collision can be surely absorbed.

[0044]

[Other Embodiment 1] As another embodiment of the main shock absorbing device mounted on the column 1, as shown in Fig. 10, spacer projections 82 are provided on the opposing surfaces of two strip steel plates 8, 81, respectively. ,
A structure is conceivable in which the rope material 3 is interposed therebetween, and the rope material 3 is interposed therebetween and fastened with the bolt 84 and the nut 85.

The overtightening of the bolt 84 can be avoided by securing a predetermined interval by the spacer projections 82 and 83. This structure has an advantage that the rope member 3 can be easily attached.

[0046]

Another Embodiment 2 As shown in FIG. 11, a half-cylinder piece 45 is provided which matches the half-cylinder 42 of the end stopper 4, and the rope material 3 is clamped between the half-cylinder 42 and the half-cylinder piece 45. 46 and nut 4
A structure for fastening at 7 is also conceivable. In this case, the bolt 46
By adjusting the fastening force, a frictional resistance force can be obtained, so that it can be used as a shock absorbing device.

[0047]

Another Embodiment 3 As another structure of the sub shock absorbing device, as shown in FIG. 12, a structure in which the above-mentioned main shock absorbing device 2 is shortened can be considered. That is, two rope members 3 are accommodated in accommodation grooves 91, 91 opened in the main body 9,
The structure is such that the holding member 92 is mounted from above and the rope material 3 is held.

The structure of other details is the same as that of the main shock absorber 2. The structure of the holding tool 92 is shown in FIG.
As shown in FIG. 3, a through-hole 92 is formed in an inverted triangular holding portion 92a.
b may be penetrated, a bolt 92c may be inserted into the through-hole 92b, and a nut 92d may be used for fastening.

[0049]

As described above, the present invention has the following effects. <B> Energy damping effect by the energy absorbing effect of the shock absorbing device, the energy damping effect by the deformation of the strut via the end stopper, and the energy damping effect of the impacting object by the shock absorbing device for anchors. However, an extremely high impact absorbing fence can be obtained.

<B> By providing an end stopper at the extra length of the rope material, continuity can be imparted to the damping effect due to sliding of the rope material and the damping effect due to deformation of the support. In addition, the impact energy can be transmitted to adjacent rope materials and struts to attenuate the impact energy in a chain. Therefore, the attenuation amount of the impact energy of the entire fence can be set large.

<C> When a tension greater than the set value acts on the rope material, sliding of the rope material with respect to the column is allowed, and concentration of stress on the mounting portion of the rope material can be avoided. Therefore, the load burden on the rope material and the shock absorbing device is reduced, which is advantageous in terms of design as compared with the conventional fence in which the rope material is fixed to the column.

<D> The attenuation of the impact energy can be easily set only by changing the extra length of the rope material.

<E> By mounting the end stopper slidably on the rope material, an effect of damping impact energy can be obtained.

[Brief description of the drawings]

Fig. 1 Front view of the entire shock absorbing fence

[Figure 2] Side view of the shock absorbing fence

FIG. 3 is an explanatory view of a column and a main shock absorbing device.

FIG. 4 is an explanatory view of a mounted state of an end stopper.

FIG. 5 is an explanatory view of a disassembled state of an end stopper.

FIG. 6 is a perspective view of a sub shock absorbing device.

FIG. 7 is a sectional view of a sub shock absorbing device.

FIG. 8 is a perspective view of a shock absorbing device for an anchor.

FIG. 9 is a sectional view of a shock absorbing device for an anchor.

FIG. 10 is an explanatory view of another embodiment of the main shock absorbing device.

FIG. 11 is an explanatory view of another embodiment of the end stopper.

FIG. 12 is an explanatory view of another embodiment of the sub shock absorbing device.

FIG. 13 is an explanatory view of another embodiment of the sub shock absorbing device.

Claims (4)

(57) [Claims] An impact absorbing fence comprising a plurality of rope members laid horizontally between columns which are erected at an interval, wherein a main impact holding two rope members halfway between adjacent columns is provided. Attach the absorbing device, make the main shock absorbing device of each of the struts overlap the two rope materials and clamp them, and attach the end stopper that restrains the rope material from coming out at the extra length of each superimposed rope material And installing a sub-impact absorbing device for gripping between the main impact absorbing device and the end stopper of each of the superposed rope materials, wherein the main impact absorbing device and the sub-impact absorbing device have a tension less than the tensile strength of the rope material. Is gripped with a pinching force that allows sliding with the rope material when it acts, and the tension of the rope material and the bending force of the strut are transmitted to each other when the end stopper, the sub shock absorber, and the main shock absorber come into contact with each other. Configuration possible A shock absorbing fence characterized by: 2. The shock absorbing fence according to claim 1, wherein the supporting column is manufactured by arranging a PC steel material in a non-tension state on a tension side in the steel pipe at the time of an impact action and filling the steel pipe with concrete. 3. The shock absorbing fence according to claim 1, wherein the end stopper is fixed to the extra length of the rope material and is mounted so as to grip a part of the other roll material to be polymerized. 4. An end of a mooring rope is connected to a column, the other end of the mooring rope is overlapped with a U-bolt, and the U-bolt is held by an impact absorbing device for an anchor, and the U-bolt is grounded by an anchor. The shock absorbing fence according to any one of claims 1 to 3, further comprising a support structure for a column installed on the fence.