JPS6129779Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a stream bed protection material for preventing erosion of the stream bed.

For example, in volcanic areas such as Sakurajima, Kagoshima Prefecture, there is a large amount of pumice called mullet in the valleys, but recently erosion of the valley floor and damage caused by the mullet runoff has become a major problem. It's summery. In particular, when the water volume increases due to rainfall, a large amount of mullet flows out, causing great damage.

The purpose of this invention is to provide a stream bed protection material that can easily and reliably prevent the above-mentioned mullet from flowing out. The support frame is arranged in stages, and a porous barrier is provided on the upstream surface of the support frame to prevent the debris from flowing out.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings. In FIGS. 1 and 2, 1 is a mountain bed, 2 is pumice called bora deposited on the mountain bed 1, and Valley bed 1 to prevent mullet from flowing out
A riverbed protection material 3 is installed over the entire area or a part of the area.

The stream bed protection material 3 includes a barrier body 4 formed in an L-shape from a porous material having water permeability, a lid body 5 formed in a flat plate shape from the same material, and a member for supporting them. A large number of support frames 6 are arranged at regular intervals over the entire width of the stream bed 1 from which the mullet 2 has been temporarily removed, and if necessary, The supporting frames 6 are connected to each other by connecting rods 7, and the supporting frame assemblies 8 constituted by the supporting frames 6 are arranged in multiple stages in the direction of water flow, and the bent edge 4a is attached to the upstream side of each supporting frame assembly 8. Each of the above-mentioned blocking bodies 4 is stretched in a state where it is in contact with the ground toward the ground, and after the removed mulch is returned to its original position, a cover body 5 is placed on each support frame assembly 8. Therefore, each blocking body 4 is sandwiched between the upstream support frame assembly 8 and the downstream support frame assembly 8, and its bent edge 4a is held by the upstream support frame assembly 8 and the bollard. Because it is pressed against the stream bed, it is supported extremely stably. In this case, the front and rear support frames 6, 6 or support frame assemblies 8, 8 can be connected to each other.

The lid 5 is preferably formed to be slightly longer than the length of the support frame 6 so that it partially overlaps with the lid 5 on the downstream side, and is connected to the overlapping portion with an appropriate connecting fitting 9. Preferably, the upstream end of the lid 5 is connected to the blocking body 4.

In addition, as the porous material constituting the above-mentioned barrier body 4 and lid body 5, as shown in FIG.
A clip wire mesh consisting of wide wires covered with a synthetic resin band-like coating 11 is suitable, but other welded wire mesh, expanded metal, perforated iron plates, etc. may also be used. In order to increase the supporting strength, reinforcing wires 12 may be stretched diagonally.

In the stream bed 1 where the stream bed protection material 3 is installed, even if the mullet 2 tries to move downstream due to the water flow flowing inside the mullet layer, the barrier 4 prevents the movement. Therefore, it does not flow out from the stream bed 1. In this case, the blocking body 4 is held between the front and rear support frames 6, and the force of the bolet acts on the bent edge 4a to press it against the stream bed 1, so that the blocking body 4 is not deformed or moved. etc. will be reliably prevented.

Even if the water volume increases due to rain and the lightweight mullet attempts to float to the surface, the lid body 5 prevents it from floating. In this case, if the barrier 4 is formed of a crimp wire mesh as shown in FIG. 3, the bollard 2 pressed against the barrier 4 will be caught on the uneven surface of the wire mesh and will be difficult to move up and down. This prevents the mullet from flowing downstream through the mesh.

FIG. 4 shows the support side 6 for the blocking body in the support frame 6.
a is tilted toward the upstream side, and thereby the blocking body 4 is installed in a similar inclined state, and in this case, the bollard 2 acting on the blocking body 4
The acting force is deflected downward by the blocking body, and the force acting downward on the bent edge 4a increases, so that the strength of blocking the bolet by the blocking body 4 can be dramatically increased.

As detailed above, according to the present invention, the porous barrier is arranged in the stream bed in the direction that intersects the water flow, so that the outflow of mullet can be ensured without interfering with the water flow. In addition, the lower end of the cutoff body is provided with a bent edge, and this bent edge is placed facing upstream and in contact with the ground. The bent edge reliably prevents scouring directly under the barrier, which is likely to be dug.Moreover, since the bent edge is pressed against the stream bed by the force of the soil and stones, the barrier does not float. Climbing is prevented, the installation stability is significantly increased, and the blocking strength of soil and stones is dramatically increased.

[Brief explanation of the drawing]

Fig. 1 is a longitudinal sectional view showing one embodiment of the present invention, Fig. 2 is a plan view thereof, Fig. 3 is an enlarged sectional view of the main part of the interrupter, and Fig. 4 is a longitudinal sectional view showing another embodiment of the invention. It is a front view. 1...River bed, 2...mullet, 3...River bed protection material,
4...Blocker, 6...Support frame.

Claims (1)

[Scope of utility model registration request] A porous barrier is provided in the stream bed in a direction that intersects with the flowing water to prevent soil and rocks such as pumice from flowing out, and a support member that supports the barrier is provided. A streambed protection material characterized by having a bent edge that contacts the streambed facing upstream.