JPH0139766Y2 - - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to an improvement of a rock fall prevention fence.

Rockfall prevention fences are widely used as a safety measure for roads in hilly, mountainous areas, etc., and their structure generally consists of multiple pillars installed at predetermined intervals at the foot of a slope where rockfalls are expected to occur. Wire ropes and wire mesh are stretched and fastened between these supports to form a fence-like structure.

However, although these rockfall prevention fences are effective against small rockfalls, they cannot effectively attenuate the strong falling energy when a large rockfall occurs. There were problems in which the fence bounced onto the road and violently collided with the fence, causing fatal deformation and damage to the fence, which required a great deal of effort and expense to repair.

This invention was devised to solve the above-mentioned problems, and its purpose is to be able to effectively attenuate the strong falling energy of large falling rocks, and to make it easy to implement. The objective is to provide an easy rock fall prevention fence.

In order to achieve the above purpose, this invention installs a receiving fence, which is weaker in strength than the main fence, between the main fence installed along the foot of the slope and the slope behind it. The falling rock is once received by the receiving fence, and the falling rock is disengaged to reduce the falling energy before colliding with the main fence.

In other words, the feature of the present invention is that a main fence is provided along the foot of the slope at predetermined intervals, and a wire mesh is stretched and fixed between the pillars via wire ropes, and the main fence is installed between the main fence and the slope. and a main fence comprising the pillar, a plurality of wire ropes diagonally connecting the slope through cable end fittings, wire ropes intersecting the wire ropes at predetermined intervals, and a net stretched over the wire ropes. This is because a lower-strength receiving fence was installed.

Embodiments of the present invention will be described below with reference to the accompanying drawings.

Figures 1 to 6 show an embodiment of the rockfall prevention fence according to the present invention, in which 1 is the main fence installed along the foot of the slope, and the terminal support 4 and intermediate The struts 5, 5 are erected, a plurality of wire ropes 7 are stretched in parallel between the terminal struts 4 and the intermediate struts 5, 5, and the terminal portions of the wire ropes 7 are attached to the terminal struts 4. The end fixing fittings 8 are used to fix the intermediate portions to the intermediate supports 5 using fastening devices such as clips (not shown), and wire mesh is attached to the tensioned flat part of the wire rope 7 using a suitable fastening device 9 such as a band wire. 10 is fixed.

The above-mentioned structure is similar to the conventional rock fall prevention fence, but in the present invention, a receiving fence 2 having a structure weaker than the main fence 1 is stretched diagonally between the main fence 1 and the slope 3. It is something to do.

To describe the structure of the receiving fence 2 in detail, the cable end fittings 11 are attached to the middle portion of the fence height on the slope side of the pillars of the main fence 1, for example, each of the intermediate pillars 5, 5, via adjustment rods 16, and each rope is A foundation 12 made of concrete or the like is provided on a slope 3 that is an extension of the end fitting 11, and a rod-shaped anchor 13 with a turnbuckle 14 attached to the outer end is buried in this foundation 12. A cable end fitting 11' is attached to the rod-shaped anchor 13 via an adjustment rod 16' which has a mounting thread 15 at one end that engages with the female thread of the turnbuckle 14. The tension can be adjusted arbitrarily. A wire rope 17 is arranged between the cable end fitting 11 on the intermediate support side and the cable end fitting 11' on the rod-shaped anchor side, and both ends of the wire rope 17 are fastened to the cable end fittings 11 and 11', respectively.

The cable end fittings 11, 11' are optional, but from the viewpoint of ease of repair, it is preferable to use a wedge stop using a conical socket. In the illustrated example, as shown in FIG. 5, there is a socket 110, a wedge 111 pushed into the strand inserted from the tip of the socket 110, and adjustment rods 16, 16' inserted from the rear end of the socket and screws. A fitting nut 112 is provided.

The attachment of the cable end fitting 11 to the intermediate strut 5 is optional. For example, as shown in FIG.
1 to connect the two, pass the female threaded part of the U bolt 21 through the through hole provided in the intermediate support 7, and then tighten the nut 22.
You can use a method such as tightening and fixing with. The cable end fittings 11, 11', the rod-shaped anchor 13, and the wire rope 17 may be formed parallel to the road surface, but from the viewpoint of reducing the amount of members used and reducing the energy of falling rocks, the required angle of inclination is It is desirable to have

In any case, the wire rope 1 is stretched between each intermediate support 5, 5 and the rod-shaped anchor 13, 13, respectively.
7 and 17 are supporting members, and these wire ropes 1
Between 7 and 17, a plurality of wire ropes 18 and 18 are installed parallel to the wire mesh 10 stretched on the road side.
are arranged at predetermined intervals and fixed at both ends and intersections with fasteners 19, 19 such as cross clips.

Then, a mesh body 20 such as a wire mesh is arranged on the upper surface of the frame composed of the vertical and horizontal wire ropes 17 and 18, and the wire rope 17 is attached with a suitable fastening device such as a bind wire in the same manner as the main fence 1 described above. , 18,
Form a receiving surface.

In other drawings, reference numeral 25 indicates a reinforcing diagonal member provided between the terminal support 4 and the foundation 6.

Next, the function of the rock fall prevention fence according to the present invention will be explained.

In the present invention, a receiving fence 2 is installed in an area behind the main fence 1 and across the slope 3. Therefore, when a large rock falls, the large rock will not slide down the slope 3 and suddenly collide with the main fence 1, as in the case of the conventional method, and instead will slide down the slope 3 as shown in Figure 7A. Then, when you get close to the end of the slope, you can finally catch it at Uke-fence 2.

This receiving fence 2 consists of cable end fittings 1 attached to each intermediate support 5 and a rod-shaped anchor 13 extending from the slope side.
A frame is constituted by a wire rope 17 whose both ends are fastened by wire ropes 1 and 11', and a wire rope 18 which intersects with this wire rope 17 and is fixed by a fastener 19, and a net 20 is stretched over this frame. It has a much softer structure and lower strength than Main Fence 1.

Therefore, when the falling rock A hits the receiving fence 2, as shown in FIG.
The wire ropes 17 and 18 are detached from the fasteners such as cross clips, and the receiving surface including the net 20 is detached from the intermediate struts 5 and the rod-shaped anchors 13 as shown.

As a result, the falling energy of the falling rock A is absorbed and deenergized, and the falling rock then collides with the main fence 1 as shown in Figure 7 C. However, as mentioned above, the falling energy is reduced by the receiving fence 2 beforehand. Since it corresponds to 1,
The impact force applied to the main fence 1 is greatly reduced, and fatal deformation and damage to the main fence components are prevented.

To repair the receiving fence 2 that has come off as described above, connect the ends of the wire ropes 11, 11' to the cable end fittings 11 of the intermediate struts 5 and the cable end fittings 11' of the rod-shaped anchors 13.
This work can be easily carried out by using a wedge-shaped cable end fitting.

In the case of small rocks, after their force is reduced by the receiving fence 2, they fall from the air between the receiving surface and the slope, and are deposited between the foot of the slope and the main fence.

According to the present invention described above, the main fence 1, which has the pillars 4, 5, 5 at predetermined intervals and the wire mesh 10 stretched and fixed between the pillars 4, 5, 5, is attached along the foot of the slope. In addition to providing the support pole and the slope 3 between the main fence 1 and the slope 3, the rope end fittings 11, 1
Multiple wire ropes 1 tied diagonally through 1'
7, a wire rope 18 intersecting the wire rope 17 at a predetermined interval, and the wire ropes 17, 18.
A receiving fence 2 with lower strength than the main fence 1 is installed, and the fall energy can be reduced by releasing the receiving fence 2. It can be an effective rockfall prevention fence, and the structure of the receiving fence 2 is simple, and it has excellent effects such as being easily applicable not only to new construction but also to existing rockfall prevention fences. can get.

[Brief explanation of drawings]

Fig. 1 is a plan view showing an embodiment of the rock fall prevention fence according to the present invention, Fig. 2 is a front view thereof, Fig. 3 is a side view thereof, and Fig. 4 is a partially enlarged view of Fig. 3. , Fig. 5 is a sectional view showing an example of the cable end fitting, Fig. 6 is an enlarged view showing the connection between the intermediate strut and the cable end fitting, and Fig. 7 A, B, and C are explanatory views showing the operation of the present invention. be. 1... Main fence, 2... Reception fence, 3... Slope, 4...
Terminal support, 5... Intermediate support, 7... Wire rope, 10... Wire mesh, 11, 11'... Cable end fitting,
17... wire rope, 18... wire rope,
20... Reticular body.

Claims (1)

[Scope of utility model registration request] A main fence 1 is provided along the foot of the slope at predetermined intervals between pillars 4, 5, 5 and a wire mesh 10 is stretched and fixed between the pillars 4, 5, 5 via a wire rope 7. Between the slopes 3, a plurality of wire ropes 17 diagonally connecting the pillar and the slope 3 via cable end fittings 11, 11', wire ropes 18 intersecting the wire ropes 17 at predetermined intervals, and these wire ropes. This rock fall prevention fence is characterized in that it comprises a net 20 stretched over the main fence 1 and a receiving fence 2 having lower strength than the main fence 1.