JPS6343223Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a water-permeable block for an underdrain for constructing an underdrain for collecting and draining rainwater in a developed area.

Generally, when demolishing mountains etc. to create rice fields, fields, pastures, golf courses, orchards, or sports fields, etc.
Because the ground in the site is soft, when it rains heavily, the buoyancy of the soil causes it to float, and the water pressure washes it away, which can lead to landslides. In addition, developed land has little water retention effect due to grass, trees, etc.
When heavy rain falls, water flows rapidly over the ground and can cause temporary flooding downstream, resulting in so-called flash floods. In addition, in orchards and golf courses with poor drainage, it often causes crops and grass to become rooted.

In order to prevent disasters such as landslides and flash floods in such developed areas, and to prevent plants from being uprooted,
Generally, a culvert is installed underground in a developed area to allow rainwater to seep into the ground, collect it, and then drain it through the ground.

Conventionally, as shown in Fig. 1, a conventional method for constructing such a culvert 1 is to use a soda 3 made by collecting twigs 2 and bundling them to a length of about 2 m as a filter material, and digging it in the ground 4. A perforated hard plastic pipe 6 was passed through the trench 5, a slag 3 serving as a filter material was placed on top of the pipe 6, and the underdrain 1 was constructed by burying it underground.

However, in the case of using the coarse sludge 3 as a filter material, the outer shape becomes uneven due to the way the twigs 2 are bundled, and the shape is not constant, so it is not easy to construct, and the ground surface sinks over a long period of time, causing dents. There are problems such as. In addition, since the twigs 2 are collected and bundled in the twigs 3, the twigs 2 have been in short supply in recent years, and the cost of manpower has increased, making construction costs higher year by year.

For this reason, in recent years, as shown in FIG. 2, instead of the culvert 3, it has become common to construct the underdrain 1 by embedding crushed stone 7 as a filter material.

However, in this structure using crushed stone 7, the groove 5 tends to collapse, especially in areas with soft soil, and even if crushed stone 7 is thrown in, mud enters and it is not possible to create a culvert 1 of a certain shape. Therefore, it was necessary to create a temporary road exclusively for dump trucks, which had the disadvantage of increasing costs.

The present invention was developed as a result of various studies in consideration of these points, and was developed as an underdrain system that is easy to construct, can be produced in a factory, is inexpensive, and can maintain a stable water collection function over a long period of time. This is a water-permeable block developed.

The present invention will be described in detail below with reference to embodiments shown in the drawings.

FIGS. 3 and 4 show an embodiment of the present invention. This water-permeable block 8 has a rectangular parallelepiped-shaped block main body 11 made of a mixture of wood chips 9 and asphalt 10 and molded under pressure. A perforated hard plastic pipe 6 is inserted along its longitudinal direction to form a passageway 12.

The wood piece 9 may have any shape, such as a chip or a block, and its size may be arbitrary. The wood chips 9 and asphalt 10 are mixed at an appropriate mixing ratio, and the mixture is pressed and molded while heating to form a block body 11 in the shape of a rectangular parallelepiped. In this case, the mixing ratio of the wood pieces 9 and the asphalt 10 may be such that the entire surface of the wood pieces 9 is covered with the asphalt 10 and the pieces of wood 9 stick together. Further, the molding pressure should be such that the wooden pieces 9 are not crushed, an appropriate gap is formed between the wooden pieces 9, and the strength is maintained to the extent that the water-permeable block 8 does not collapse when being transported or buried.

Further, as the hard plastic pipe 6 that becomes the water passage 12, for example, a hard polyethylene pipe or a vinyl chloride pipe is used, and a large number of water holes 1 are formed on the wall surface.
3. Use a perforated pipe. At the time of pressure molding, a perforated hard plastic pipe 6 is embedded in a mixture of wood chips 9 and asphalt 10, and the mixture is pressure molded into one piece.

The rectangular parallelepiped block-shaped water-permeable blocks 8 molded in the factory as described above are carried to the development site, and a plurality of blocks are connected and lined up in the trench 5 dug here, and then covered with soil to construct the culvert 1 as shown in Fig. 5. It is something to do.

The culvert 1 formed in this way has a water permeable block 8
However, since it is formed into a block shape by the wooden pieces 9, it is highly permeable as a filter material, absorbs and collects rainwater flowing on the ground surface, and makes the water stay between the wooden pieces 9, and furthermore, the hard plastic pipe 6 Water flows into the pipe through a water passage hole 13 formed in the wall surface, and is drained there as a passageway 12.

In addition, since the surface of the wood piece 9 is coated with asphalt 10, it has a preservative effect on the wood piece 9, and does not rot even if it is repeatedly exposed to moisture or dry conditions, and has good water permeability for a long period of time. It can maintain its properties and water retention properties. Moreover, due to the adhesive action of Asphalt 10, the shape of the block can be maintained for a long period of time, and since it is pressure-molded, the inside is uniform and has appropriate strength, so it can be used for a long period of time to prevent depressions in the ground surface. It can also be prevented.

In addition, the water-permeable block 8 can be mass-produced in a factory using inexpensive pieces of wood 9 or asphalt 10, so it can be manufactured at low cost and can be easily molded, so it is possible to obtain the desired shape and size. can. Furthermore, since the water-permeable block 8 of the present invention is made of a piece of wood 9, it is lightweight and easy to transport. In addition, since it is molded into a block of a certain shape, even when buried in a trench 5 of soft soil, the underdrain drainage channel can be formed as planned without being affected by the collapse of the trench 5, making construction extremely easy and cost-effective. is about 3
It can be reduced to 1/2.

FIGS. 6 to 13 show other embodiments of the present invention, respectively.

Figure 6 shows a plastic sheet 1 made of vinyl chloride etc. on the underside of a perforated hard plastic pipe 6.
This is a water-permeable block 8 with 4 wrapped around it. This water permeable block 8 can prevent the water passage hole 13 of the hard plastic pipe 6 from being blocked by muddy water seeping out from the lower part of the underdrain 1 by means of the plastic sheet 14.

In FIG. 7, the water passage 12 is formed by a cavity 15 without using the hard plastic pipe 6.
In addition, the block body 11 has a large piece of wood 9 on the upper side.
The lower part is precisely molded with fine pieces of wood 9 to prevent mud from entering.

When manufacturing this water-permeable block 8, an iron pipe is put into a mold as a core metal, a mixture of wood chips 9 and asphalt 10 is put therein, pressure molded, and the core metal is pulled out, so that the wall surface becomes a porous hole. water hole 1
A cavity 15 having a diameter of 3 is formed.

Further, in FIG. 8, a plastic sheet 14 such as a vinyl chloride sheet is integrally bonded to the bottom side of the block body 11.

Further, in FIG. 9, the entire surface of the block body 11 is surrounded by a fiber or metal net 16 to reinforce the outer surface, and the blocks are bonded together during molding. In this way, by surrounding the outer surface with the net 16 as a reinforcing material, it is possible to prevent the surface from collapsing during transportation and construction.
A predetermined shape can be maintained.

In FIG. 10, a plastic frame 17 is attached to the corner of the block body 11 to reinforce the corner.

Further, FIG. 11 shows a block body 11 formed in a convex shape, and this protrusion 18 is used as a earth stop and is partially protruded from the ground 4 and buried in the ground. In this case, the protrusion 18 protruding from the ground 4 acts as a dam, stopping the earth and sand flowing from the mountain side, allowing only rainwater to flow over the top and fall, collecting the water in the underground culvert 1. It was designed so that

In addition, in FIG. 12, the block body 11 is formed into an L shape, and the ground 4 is similar to the water-permeable block 8 in FIG.
The protrusion 18 protruding from above is used as an earth stop.

Furthermore, FIG. 13 shows another method of use, in which water-permeable blocks 8 are buried along the eaves of a house 19 to form a culvert 1. Normally, rainwater is drained by installing a U-shaped groove block on the ground 4 under the eaves, but by using the permeable block 8 of the present invention, the site can be used effectively.

As explained above, the permeable block for underdrain according to the present invention is easy to construct, can be manufactured in a factory, can be manufactured at low cost, and can maintain a stable water collection function over a long period of time. This can be particularly effective in constructing culverts in areas with soft ground.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a conventional underdrain using a sluice, Fig. 2 is a sectional view of a conventional culvert using crushed stone, Fig. 3 is a perspective view of a permeable block according to an embodiment of the present invention, and Fig. 4 is a cross-sectional view of the permeable block shown in Fig. 3, Fig. 5 is a cross-sectional view of an underdrain constructed using the permeable block shown in Fig. 3, and Figs. 6 to 13 respectively show other embodiments of the present invention. Figures 6 to 8
The figures are cross-sectional views of the water-permeable block, Figures 9 and 10.
The figure is a perspective view of a permeable block with reinforcement, No. 11.
Figures 1 and 12 are cross-sectional views of a culvert that also serves as an earth stop, and Figure 13 is a cross-sectional view of a culvert used as a drainage ditch under the eaves. 1... culvert, 2... twig, 3... stubble, 5...
Groove, 6... Plastic pipe, 7... Crushed stone, 8
... Water permeable block, 9 ... Wood piece, 10 ... Asphalt, 11 ... Block body, 12 ... Water passage, 13 ... Water hole, 14 ... Plastic sheet, 15 ... Hollow, 16 ... Net, 17...
Frame, 18... Protrusion, 19... House.

Claims (1)

[Scope of utility model registration request] A water-permeable block for an underdrain, characterized in that a perforated wall passageway is formed along the longitudinal direction in a rectangular parallelepiped-shaped block body made by pressure-molding a mixture of wood chips and asphalt.