JPS6011939Y2 - Underdrain drainage structure - Google Patents

Description

[Detailed explanation of the idea] This invention relates to an underdrain drainage structure.

The purpose of this is to create a culvert drainage structure that greatly promotes drainage to the culvert drainage pipe, and this effect is semi-permanent. Our goal is to provide the following.

By the way, in the current situation of oil shortages, coal-fired power generation is being reconsidered as a national policy, but one of its major drawbacks is the problem of disposing of coal husks, and how to dispose of them has become a serious issue.

Another purpose of the present invention is to provide an underdrainage structure useful for the disposal of coal combustion shells, promote coal-fired power generation, and thereby alleviate oil shortages.

In recent years, agriculture has been modernized and almost mechanized, but
In order to promote mechanization, extensive improvements are being made to farmland.

A nationwide effort is underway to improve farmland by burying culvert drainage pipes in poorly drained farmland to improve drainage.

This culvert drainage pipe is a synthetic resin pipe with countless small holes drilled in it, and is buried at a depth of 50 to 70 cm from the surface of the farmland with a slight slope. To prevent soil from clogging the holes, materials such as rice husks, tree branches, bamboo, etc. are usually buried around the pipes to promote drainage.

However, these rice husks, tree branches, bamboo, etc. are easy to rot and turn into soil over a long period of time, and as a result, they block the small pores of the pipe and have little effect on promoting drainage. If a call is made, this culvert drainage work will have to be redone.

Since this culvert drainage work is a national policy, a large amount of national funds are used as subsidies, but it is a very big problem to use such important national funds every 10 years or so.

Keeping this in mind, and also considering the current oil situation and the problem of coal-fired power generation, the inventor of this invention believes that if coal combustion shells are used as a material to promote culvert drainage, a significant effect can be achieved by killing two birds with one stone. As a result of experimenting with this idea, we came up with this idea.

In other words, they came up with an underdrain drainage structure characterized by burying coal combustion shells crushed to an appropriate size around the underdrain drainage pipe.

The present invention will be explained with reference to the drawings.

FIG. 1 is a sectional view of one embodiment of the structure of the present invention.

FIG. 2 is a sectional view of another embodiment of the structure of the present invention.

As shown in these figures, the present invention provides a groove 2 in a farmland 1, lays a drainage pipe 3 in the groove 2, and embeds coal combustion shells 4 crushed to an appropriate size around the drainage pipe 3. It has become a thing.

Usually, the diameter of the drain pipe 3 is about 5 to 12 cm, and a large number of small holes 5 are bored around the drain pipe 3.

The depth of this drainage pipe 3 from the ground surface is approximately 5 DC on one end side.
At the 71st position, gradually slope the other end of the drain outlet side to about 70
It is buried to a depth of about cm.

The size of the coal combustion shell 4 in this invention is the size of the drainage pipe 3
It is sufficient that the material does not fit into the small holes 5 and has high water permeability so that it is difficult for soil to flow into the gap, and the preferred size is usually from the size of a grain of rice to the size of a pea.

Further, it is preferable to bury a large amount of the coal combustion shells 4 above the drain pipe 3, and the amount of coal combustion shells 4 to be used is usually 1 d. .

In FIG. 1, soil 6 is placed on top of the coal combustion shell 4, but in the structure shown in FIG. 2, the entire area above the drain pipe 3 is covered with the coal combustion shell 4.

In the case shown in FIG. 2, a drainage pipe 3 and a coal combustion shell 4 are mechanically buried at the same time using a culvert drainage pipe burying machine.

The width of the groove 2 in Fig. 1 is about 20 cm, and the width of the groove 2 in Fig. 2 is about 20 cm.
The width at the top is about 10cm and the diameter at the bottom is about 15cm.

The present invention is as described above, and uses burnt coal husks instead of momic acid, tree branches, bamboo, etc., which were conventionally used as drainage accelerator materials around drainage pipes in culvert drainage. .

These coal combustion shells are relatively light and easy to transport, and they do not rot or change their buried condition, promoting drainage semi-permanently and never clogging small holes in drainage pipes. be.

Furthermore, the effect of promoting drainage is that the shape of the coal combustion shells is completely irregular, so even if they are packed together, voids or water passage holes are likely to be formed, resulting in extremely excellent water permeability.

In this way, since the present invention uses non-perishable granular material called coal combustion shells, the underdrain drainage is permanent, and its effectiveness is lower than that of the conventional structure in which the underdrain drainage work had to be redone every time. It is extremely large.

Moreover, the coal combustion shells used in this invention are waste generated from coal-fired power generation, which is currently being promoted as a national policy, and the country plans to switch about 25% of oil-fired power generation to coal-fired power generation in the future. This invention solves the problem of disposing of coal combustion shells, which was the biggest obstacle in the industry, and is an extremely effective device as a means of dealing with the oil shortage situation. Together, this will bring about significant benefits, killing two birds with one stone.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the structure of the present invention. FIG. 2 is a sectional view of another embodiment of the structure of the present invention. 1... Farmland, 2... Ditch, 3...
・Drainage pipe, 4... Coal combustion shell 5...
...Small hole, 6...Soil.

Claims (1)

[Scope of utility model registration request] This culvert drainage structure is characterized by burying coal combustion shells crushed into appropriate sizes around the culvert drainage pipe.