JPS5931610B2 - Reinforced slope protection method - Google Patents

Description

[Detailed Description of the Invention] The present invention sprays soil containing mortar or adhesive (such as cement or synthetic resin) onto slopes made of rock or soft rock to cause collapse of the slope and the falling of rocks and stones. In the slope protection construction method that aims to prevent greening of the slope or to green the slope, the structure of protection works such as sprayed mortar and soil on the slope is further strengthened (reinforcing net This method relates to a construction method in which the body is placed close to (inside) the surface of the protection work, and the thickness of the protection work such as mortar can be freely made approximately constant regardless of the undulations of the slope.

To explain the present invention based on drawings showing embodiments thereof, a grounding circumferential collar 6 is fixed to the intermediate part of the shaft portion 8, and the length of the shaft portion 8 between the head I and the collar 6 is set according to a predetermined length. A large number of anchor bolts 2.2', which are slightly shorter than the thickness of the protection work 9 on the slope 1 made of mortar, soil, etc., are dispersed in an appropriate manner on the slope 1 so that their flanges 6 are It is driven in until it contacts the slope 1, and the shaft part 8 between the head 1 and the collar 6 is exposed to the ground and fixed.

Next, 100 to 500 meshes are formed as the mesh support line 5.
A round iron net with a width of rIrrIL is tied to the head of each anchor pole (2, 2') in an appropriate manner so that it does not easily separate from the net.
Head of each anchor bolt 2, 2'... γ l/...
Stretch tension in between.

The length of the mesh, which will serve as reinforcing bars for the slope protection work, is approximately 50m.
After laying the iron mesh 3 on the rounded steel net in a laid pattern while bonding each other at appropriate points, apply mortar or soil containing an adhesive that also serves as an anti-erosion agent to the slope 1 as planned. This method involves spraying the protective layer 9 to a certain thickness.

According to the construction method described above, each anchor bolt 2 whose head I is located at a distance of a certain shaft portion 8 length from the slope 1
, 2'..., while being attached to the head of the mesh body supporting muscle line 5,
In addition, since the net 3 for reinforcing the protection works is stretched, even if there are undulations on the slope 1, it will not be disturbed by the undulations. It becomes possible to freely stretch the net support reinforcement wires 5 and the net 3 while maintaining the distance, and slope protection works such as mortar with a uniform thickness that matches the undulating shape of the slope 1 can be naturally and easily carried out. You will get it.

According to such a construction method, the reinforcing net 3 is connected to the protective work 9.
Since the protection work 9 is placed very close to the surface of the protection work 9, its structural properties such as resistance to bending stress are strengthened to the maximum, and the protection work 9 does not easily collapse or erode or peel off from the slope 1. In addition, due to the presence of this reinforcing net 3, when spraying mortar or soil on the slope 1, it is possible to obtain a strong protection structure 9 that will not fall off. Due to the liquidity of
Slope 1 has suppressed the tendency for thick protection work to be applied to concave areas of the slope and thin protection work to be applied to convex areas of the slope.
At the same time, good results such as being able to easily obtain a protective layer with a uniform thickness regardless of the shape of the protective layer are also obtained.

Furthermore, according to this construction method, the reinforcing net 3 is stretched from the slope 1 at a distance close to the thickness of the predetermined spraying thickness of mortar, soil, etc. The level serves as a good indicator for spraying mortar, soil, etc. to a predetermined thickness, and greatly contributes to making the thickness of the protection work 9 uniform.

It goes without saying that the presence of the net 3 also serves as a good indicator for measuring the thickness of the protective work 9 after spraying work, making the measurement easier and more accurate. Nor.

Furthermore, the presence of the net supporting reinforcement wires 5 stretched between the anchor bolts 2, 2', etc. means that even if a worker stands on the net 3 during spraying work of mortar or soil, the net This serves to support the net 3 so that it does not tear or break, and therefore, the presence of the net support wires 5 allows a worker to ride on the net 3 and carry out spraying work. This is an essential element for improving the work efficiency of the construction method according to the present invention.

Fig. 3 shows the case where a large number of reinforcing bars are used as the mesh supporting reinforcement wires 5 used for supporting the reinforcing mesh 3 when the reinforcing mesh 3 is stretched. Each anchor pol having part I) 2, 2'... of its head 7.
1'...stretched in tension between them, and a reinforcing net 3 is placed on top of it.
The reinforcing steel wire is connected to the reinforcing steel wire as appropriate and stretched in a laid-down manner.

Even in such a case, there is no separate provision or change in the effects of the reinforcing net 3 and the effect of the net support wires 5 on improving the efficiency of the spraying operation.

As the reinforcing net 3, instead of the above-mentioned iron net, a corrosion-resistant metal net, a plastic net made of polyethylene or nylon, a synthetic fiber net, etc. may be used as appropriate. Needless to say.

As stated above (the construction method of the present invention
This makes it possible to freely install the net at a substantially constant distance from the slope, regardless of the undulations of the slope. This method not only makes it easy to create slopes regardless of the shape of the slope, but also makes it easier to obtain protection works with a strengthened and homogeneous structure on the entire slope surface, which was impossible to obtain with conventional slope protection works. At the same time, the effect of facilitating the inspection work can be obtained, and the effect of not reducing the efficiency of the spraying work of protection works with the help of the net support wires can also be obtained in a clever way. Therefore, the influence of the present invention on the progress of slope protection technology is significant, and its effects are extremely remarkable.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway perspective view of a slope protection work obtained in accordance with one embodiment of the present invention, Fig. 2 is a sectional view of the slope protection work, and Fig. 3 is an anchor bolt in another embodiment of the present invention. FIG. 2 is a partially cutaway perspective view showing the construction state of the net support reinforcement lines and the reinforced net. 1...Slope surface, 2, 2'...Anchor bolt, 3...Reinforcement net, 5...Plant support line, 9... ...Slope protection work.

Claims (1)

[Claims] 1. A grounding flange 6 is fixed to the middle part of the shaft portion 8, and the length of the shaft portion between the head 7 and the flange 6 is covered with a predetermined protection work 9 on the slope 1 such as mortar. A large number of anchor poles 2, 2', etc., which are slightly shorter than the thickness of Next, the mesh support wire 5 is attached to each anchor bolt 2, 2'.
It is stretched while being attached to the head of ..., and further the reinforcing net 3
A slope protection construction method characterized by spreading mortar etc. on the slope 1 to a predetermined thickness after laying it on the network supporting reinforcement line 5. 2. The method for protecting a slope as set forth in claim 1, wherein the net support reinforcement wires 5 are rounded. 3. In the slope protection method described in claim 1, the net support reinforcement wires 5 are metal reinforcement wires.