JPS5949372B2 - Erosion control method for upstream rivers or small rivers, etc. - Google Patents

Description

[Detailed Description of the Invention] This invention quickly drains muddy water contained in earth and sand from a drainage pipe downstream through a disaster prevention system to reduce the force of a debris flow and prevent disasters. The purpose is to prevent the upper bed of the river bed and to construct it extremely economically.

Incidentally, to explain the embodiment with reference to the drawings, 1 is a riverbed of an upstream or small river, 2 is a downstream riverbed, and 3 is a pile that is driven into a suitable place in the river. Stack block 4 and construct disaster prevention d.

5 is a drainage pipe with a large number of water introduction holes 6 on the upper surface, and is a limb pipe 5.
Connect at least one or more.

The pipe is laid along the river bed 1, and the lower end is connected to the disaster prevention station d.

Debris flows occur mainly when the earth and sand from a mountainside collapse flows down, containing water, and the degree of disaster is extremely large, especially when a collapse encounters torrential rain or prolonged rain because it contains a large amount of water.

Therefore, this construction method was devised as a countermeasure against debris flows in such cases, and this construction method is extremely easy to construct and has a significant economical cost.

It goes without saying that this construction method is suitable for erosion control in small rivers, but if you construct at least one level of disaster prevention upstream of the dam,
The disaster prevention system reduces the force of the debris flow in each narrow area and filters muddy water to prevent debris flow deposits, driftwood, etc. from flowing down, and the water contained in the deposits is drained from the water guide hole 6 through the drain pipe 5 for disaster prevention. Since it is then discharged downstream, it has the effect of reducing the impact on the dam caused by debris flows and significantly increasing the utilization of the dam.

In particular, this type of disaster prevention is different from large-scale construction works such as gravity dams or sabo dams, which use thick concrete walls to catch the mud flowing down in a straight line with fierce force. In fact, it exhibits the performance of sewage concentration, kills the force of debris flow, and promotes the concentration of muddy water, and on the other hand, as long as the drainage pipe 5 introduces water from the water introduction hole 6 and the limb pipe 5 does not become full. It has the effect of breaking the surface tension and constantly flowing inside the pipe to drain water.

Moreover, this construction method is not only unaffected by local conditions since the construction is relatively small-scale, but also all components are suitable for casting on-site and construction is easy, making it extremely effective in reducing construction costs. There are big advantages.

[Brief explanation of the drawing]

The attached drawings are cross-sectional views showing embodiments of the construction method of the present invention.

Claims (1)

[Claims] 1. Driving piles in appropriate places upstream of rivers, small rivers, valleys, etc. and using this as a foundation, or by eliminating pile driving and building various types of blocks such as tetrapods, left leg blocks, cross-shaped blocks, etc. in an orderly or disorderly manner. Build a disaster prevention system by stacking them up, and then connect at least one or more drainage pipes or inverted groove pipes with multiple water guide holes on the upper surface, and then lay them along the river bed, and connect the lower end to the disaster prevention system. An erosion control method for upstream rivers or small rivers, etc. characterized by