JPS59329Y2 - Rockfall prevention net - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rockfall prevention net, and more particularly to a rockfall prevention net having a pocket portion for receiving falling rocks between an inclined surface and the net.

Traditionally, in order to prevent rocks from falling from above on steep slopes such as cut-throughs and natural slopes (hereinafter referred to as slopes), the slopes have been covered with nets to protect against falling rocks. A rockfall prevention net is used to collect rocks between the slope and the net to prevent damage caused by falling rocks to roads, railways, buildings, and other areas in front of the slope.

However, the conventional rock fall prevention net installed on the above slope,
Generally, as implied in Figure 1, a support post is erected at the top of a slope a, and the rear end of a wire rope C fixed to the upper end of the support support is fixed to an anchor d fixed to a gentle slope of the ground. The structure is such that the front part hangs down along the slope surface a, and a net (e) is stretched over it, so that a normal falling rock will enter the so-called pocket f between the slope surface a and the net e. This design was designed to prevent objects from falling directly onto roads and buildings.

By the way, in the rockfall prevention net having the above-mentioned configuration, when installing the pillars to be erected above the slope a, the slope of the ground where the pillars are erected is different for each pillar. Because of the difference, it is not possible to erect each support at the same installation angle, and the tips of the different support supports tend to be uneven vertically, making it difficult to align them in a straight line.

Therefore, in order to absorb the shock by rotating the above-mentioned support when a rock falls, the above-mentioned support is attached to a foundation anchored to the ground so that it can rotate freely on one axis. It is known that the upper end is connected to the top of another mountain with a wire rope, so that the installation angle of the support can be arbitrarily selected in order to reduce the impact when a rock falls.

However, with the structure described above, the installation angle of the supports is adjusted by the length of the wire rope that connects the upper end of the support to the top of the ground, so it is extremely difficult to align the inclination angles of each support. Since the above wire rope must support not only the weight of the support but also the weight of the wire rope and net that are supported by it and suspended along the slope, it is necessary to connect the top of the above ground and the top of the support. There are various problems such as the need to use a wire rope that is thicker than usual, and the strength of the fixing portion that fixes the rear end of the wire rope to the ground to be extremely strong.

In view of this, the present invention is designed to allow the angle of the pillars to be adjusted arbitrarily at the time of installation, yet have strong independence after installation, and to create a sturdy structure that is easy to construct. This was done with the purpose of providing a reliable net for preventing rockfall.

In order to achieve the above object, in the present invention, the base of the column is rotatably attached to a foundation member anchored to the ground, and the base member and the column are connected by a fixing device whose length is adjustable. The pillars are connected to each other, and the installation angle of the pillars can be arbitrarily adjusted using this fixture, and after adjustment, the pillars are fixed at that position.

Hereinafter, the present invention will be explained with reference to the embodiments shown in FIGS. 2 to 4.

As shown in FIGS. 2 and 3, the foundation member 1 is anchored at a predetermined position on the ground 2, and includes a base plate 3 and bearing plates 4 erected parallel to each other on the base plate 3. ,4 and
It consists of anchor bolts 5, 5 which are inserted into and fixed to the substrate 3 and buried underground.
5, it is firmly fixed to the ground 2.

The support column 6 is made of a shaped steel material with a cross-sectional shape, and its base is inserted between the bearing plates 4, 4, and is rotatably supported by a bolt-shaped shaft 7 inserted through the bearing plates 4, 4.

The upper parts of the bearing plates 4, 4 and the middle part of the support column 6 are connected by fixtures 8, 8.

As shown in an enlarged cross section of an example in FIG. 4, this fixture 8 includes a threaded rod 10 whose one end is pivotally supported by a bolt-shaped shaft 9 on the bearing plate 4, and whose one end is attached to the support column 6. a screw rod 12 which is pivoted by a bolt-shaped shaft 11 and has a thread opposite to that of the screw rod 10; and these screw rods 10.12.
It consists of a threaded cylinder 13 that is screwed together across the respective screws of the shafts 9 and 1, and by rotating this threaded cylinder 13,
The distance between the two axes can be adjusted.

A lower end of a wire rope 14 connected to an anchor member above the earth 2 and an upper end of a wire rope 15 hanging down along the slope surface 2a of the earth 2 are attached to the upper ends of the pillars 6, respectively. 16, 17, 18, and 19.

A net 20 is attached to the wire rope 15, and a pocket portion 21 is provided between the net 20 and the slope surface 2a.
is formed.

Since the present invention has the above-mentioned configuration, the foundation member 1 is fixed by anchor poles 1-5, 5 at the tube place where the support column 6 is to be erected,
The base of the support column 6 is inserted between the bearing plates 4, 4 of the base member 1, and attached by the shaft 7, and each threaded rod 1 of the fixture 8 is attached.
0, 12 to the bearing plates 4, 4 and the support column 6, respectively, to the shaft 9,
Attach by 11.

Thereby, the support column 6 is fixed to the base member 1 by the shaft 7 and the fixture 8.

After the struts 6 are arranged in a row at a predetermined interval in this manner, the inclination angle is adjusted by rotating the threaded cylinder 13 of the fixture 8.

In other words, in the case shown in the second figure, the threaded cylinder 13 is rotated and the shaft 9 is
, 11, the angle of inclination of the support column 6 will increase, and if the interval between the shafts 9, 11 is shortened, the angle of inclination will decrease.

By adjusting the inclination of the columns 6 arranged in a row in this manner, the tips of the columns 6 are aligned in a straight line.

Next, the wire ropes 14 and 15 are connected to the upper ends of the pillars 6, respectively, and the net 20 is attached to the wire ropes 15 hanging down along the slope surface 2a, thereby forming the pocket portion 21.
is formed.

As described above, in the present invention, when the support column 6 is installed, it is fixed without rotation by the shaft 7 and the fixture 8, so unlike the conventional structure that is pivoted by a shaft, the workability is extremely good.
Furthermore, since the angle of inclination can be adjusted using the fixture after installation, the upper ends of the pillars can be easily aligned after installation, and the appearance after installation can be significantly improved.

Furthermore, after installation, it is fixed to the foundation member with a fixing device, so the inclination angle of the column does not change, and the wire rope that connects the top of the column and the top of the ground has the same strength as conventional ones. It's fine to use one.

The fixing device 8 also includes a pair of screw rods, one end of which is pivotally connected to a position spaced apart from the axis of the foundation member and each side of the support column, and a pair of screw rods having opposite threads formed on the peripheral surface thereof, and a pair of screw rods having opposite threads formed on the peripheral surface thereof, and an inner peripheral surface It has a female thread that corresponds to the threaded part of each of the threaded rods, and a screw tube that connects this female screw to the screw rod by screwing it, so the support can be adjusted to an accurate angular position. After fixing, the fixing device has the function of supporting the column as a bracing, increasing the strength of the supporting muscles of the column.

Furthermore, since the angle can only be adjusted by rotating the solid foot tube, there is no need to use special tools, making it easier to install this kind of rock fall prevention net that requires many pillars. It has various excellent effects, such as being able to greatly improve work efficiency and greatly contributing to improving work efficiency.

[Brief explanation of drawings]

Figure 1 is an implied explanatory diagram of a rock fall prevention net with pockets.
FIG. 2 is a side view showing essential parts of an embodiment of the rock fall prevention net according to the present invention, FIG. 3 is a front view of the same, and FIG. 4 is an enlarged sectional view of the fixture in FIG. 2. 1...Foundation member, 3...Substrate, 4...
... Bearing plate, 5 ... Anchor bolt, 6.
・・・・・・Strut, 7・・・・Axis, 8・・Fixing tool, 9, 11・・・Axis, 10.12・・・
・Screw rod, 13...Screw tube, 14.15...
... wire rope, 20 ... net, 21.
...Pocket section.

Claims (1)

[Scope of utility model registration request] A support post is erected on the top of the slope, and nets 1~ are stretched around a wire rope fixed to the top of the support to form a pocket between the slope and the net surface to receive falling rocks. In the rock fall prevention net, the base of the support is rotatably attached between the left and right bearing plates of the foundation member anchored to the ground by a single horizontal shaft, and the base member and the support are connected to the base of the foundation member. a pair of screw rods having one end pivotally connected to each side of the support column at a position apart from the shaft, and forming a mutually reverse helix on the circumferential surface; and a threaded portion of each of the rods on the inner peripheral surface. A rock fall prevention net characterized in that it is connected by a length-adjustable fixture comprising a corresponding female thread and a threaded tube which is connected by screwing the female thread to a threaded rod.