JP2829431B2 - Laying of culvert drainage pipe - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for laying drainage pipes for culverts, and more particularly, to a method for laying drainage pipes having excellent drainage properties without clogging.

FIG. 3 is a diagram schematically illustrating a conventional method of laying a drainage drain pipe.

For example, when laying a culvert drainage pipe at a golf course or the like, as shown in the figure, a trench having a rectangular cross section is excavated, and a drainage culvert pipe 31 composed of a perforated pipe (perforated pipe) is held at a substantially central portion. A crushed stone layer 32 composed of crushed stone and having a specific gravity of about 1.6 is formed. Next, on the crushed stone layer 32, a mountain sand layer 33 of a specific gravity of about 1.2 made of sufficiently compacted soil or mountain sand is formed.

In the above-described construction method of the culvert drainage pipe, since the specific gravity of the mountain sand layer 33 is larger than the specific gravity of water, the permeated water flows into the crushed stone layer 32 while slowly penetrating the mountain sand layer 33. Also, the specific gravity of the crushed stone layer 32 is considerably larger than the specific gravity of water.
The water that has flowed into the crushed stone layer 32 forms a high-velocity flow in the upper layer. That is, the permeated water slowly descends while flowing the earth and sand in the mountain sand layer 33, and the water containing the earth and sand flows into the culvert pipe 31 together with the earth and sand in the high-speed flow in the upper part of the crushed stone layer 32. As a result, the culvert pipe
There was a problem that drainage was impaired due to clogging of 31.

Therefore, an object of the present invention is to provide a method of laying a drainage pipe for a culvert having excellent drainage properties without clogging.

Means for Solving the Problems According to the present invention, a columnar lightweight crushed stone aggregate made of lightweight crushed stone is formed in advance, and excavation is performed so that a drainage culvert pipe is completely surrounded by the columnar lightweight crushed stone aggregate. A method of laying a culvert drain pipe, characterized in that a culvert pipe for drainage is laid in the groove, and soil is buried around the columnar lightweight crushed stone aggregate.

Embodiment Hereinafter, an embodiment of a method for laying a drainage drain pipe of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a schematic view illustrating an embodiment of a method for laying a drainage drainage pipe according to the present invention. According to the method of the present invention, first, a groove having a rectangular cross section is excavated as in the conventional method. Next, the drainage culvert pipe 11 composed of a perforated pipe (perforated pipe) is completely surrounded by four columnar lightweight crushed stone aggregates 12 made of lightweight crushed stone and having a specific gravity of less than 1. The excavation depth is preferably slightly deeper than the height at which the four columnar lightweight crushed stone aggregates 12 are stacked as shown.

As shown in FIG. 2, the lightweight crushed stone aggregate 12 can be formed by, for example, previously packing a lightweight crushed stone 22 having a diameter of preferably 25 mm or less in a fine mesh polyethylene net 21 at a factory or a site. Finally, soil and sand are buried in the gap around the columnar lightweight crushed stone aggregate 12.

In the method of the present invention, since the specific gravity of the lightweight crushed stone aggregate 12 is smaller than the specific gravity of water, the permeated water quickly penetrates the lightweight crushed stone aggregate 12 and flows into the culvert pipe 11 while always maintaining clean water. Become.

As the lightweight crushed stone, it is preferable to use Aquasoil (trade name, manufactured by Ikegami Shoten Co., Ltd.), which is a known soil conditioner. Aquasoil is a well-known soil conditioner obtained by adding activating agents necessary for plant growth, minerals, fluorine, manganese, molybdenum, and other trace elements to granules obtained by crushing perlite and granulating at high temperatures. is there. The details of Aquasoil are described in Japanese Utility Model Laid-Open No. 63-186150. The specific gravity of the lightweight crushed stone aggregate using Aquasoil is about 0.55. A lightweight crushed stone aggregate formed by previously packing Aqua Soil having a diameter of 25 mm or less into a fine mesh polyethylene net is commercially available as Aqua Cube (trade name, manufactured by Ikegami Shoten Co., Ltd.).

In this embodiment, the method of completely surrounding the culvert pipe with the four columnar lightweight crushed stone aggregates has been described. However, it is possible to completely surround the culvert pipe with three cylindrical lightweight crushed stone aggregates stacked in a triangular shape. Clearly what you can do. It is also clear that the culvert pipe can be completely surrounded by five or more columnar lightweight crushed stone aggregates.

Effect of the Invention As described above, in the method of laying a culvert drainage pipe according to the present invention, the specific gravity of the lightweight crushed stone aggregate surrounding the culvert pipe is smaller than the specific gravity of water, so that the infiltrated water flows quickly and the culvert pipe remains clean at all times. Since it flows, there is no clogging, so that drainage is not impaired.

[Brief description of the drawings]

FIG. 1 is a schematic diagram illustrating an embodiment of a method of laying a culvert drainage pipe according to the present invention. FIG. 2 is a diagram schematically illustrating a configuration of a columnar lightweight crushed stone aggregate. The figure is a schematic diagram for explaining a conventional method of laying a drainage drain pipe.

Claims (3)

(57) [Claims] A culvert for drainage is formed in a trench excavated so that a columnar lightweight crushed stone aggregate made of lightweight crushed stone is formed in advance and a drainage culvert pipe is completely surrounded by the columnar lightweight crushed stone aggregate. A method for laying underdrainage drainage pipes, comprising laying a pipe and backfilling the soil around the columnar lightweight crushed stone aggregate. 2. The method according to claim 1, wherein the columnar lightweight crushed stone aggregate is formed by packing lightweight crushed stone having a diameter of 25 mm or less into a fine mesh polyethylene net. 3. The method according to claim 1, wherein the culvert pipe for drainage is completely surrounded by four columnar lightweight crushed stone aggregates.