JPH0144593Y2 - - Google Patents

Description

[Detailed Description of the Invention] <Technical Field> This invention relates to a drain block cover, and more particularly to a cover made of synthetic resin foam or the like that covers the periphery of a drain block for underdrain drainage.

<Background and Prior Art> Conventionally, drain blocks made of foam molded products and perforated pipes have been used for underdrain drainage. Various types of fillers are used to fill the surrounding area of the drainage ditch.For example, agricultural by-products such as sod, wheat straw, and rice husks have a limited production season. Moreover, it has the disadvantage that it tends to rot in the soil after construction and use. Furthermore, sand, gravel, and crushed stone are expensive and have high transportation costs, making them economically disadvantageous. Furthermore, there are foamed polystyrene particles that are lightweight, but further improvement is desired in terms of void retention.

<Purpose> Therefore, in this invention, as an alternative to the conventional filled hydrophobic material mentioned above, we take advantage of the characteristics of lightweight and inexpensive synthetic resin, and the uniqueness of its shape allows it to maintain an appropriate gap, while also being easy to install. To provide a drain block cover that allows work to be carried out efficiently.

<Structure> The structure of the drain block cover of this invention to achieve the above object has one or more unit cover parts consisting of the following ~, and the whole is formed in a sheet shape from a synthetic resin sheet. It is characterized by the fact that At least one strip-shaped bent portion is formed over the entire length or substantially the entire length. Along both sides of the bent portion, undulating portions are formed parallel to the bent portion. Reinforcing ribs intersecting with the uneven stripes are formed in the wavy portion. A large number of water holes are formed at least in the corrugated portion.

<Example> Next, an example of this invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment in which unit covers A and A' having different widths are connected at a two-row joint.

The above-mentioned covers A and A' are in the form of a sheet that is integrally molded entirely from a semi-rigid synthetic resin sheet (about 1 to 4 mm thick) such as a foamed polystyrene sheet, and when taken alone, each has a rectangular plane. ing.

Of each cover A, A', 1 is a band-shaped bent part formed over the entire length or almost the entire length in the longitudinal direction, and in the figure, one strip is formed in the middle part, and its cross section is It's becoming flat. Also,
A plurality of bending grooves 1a are formed at predetermined intervals over the entire length on one side of the bending portion 1, so that the bending can be easily performed.

2 is a wavy portion formed along both sides of the bent portion 1 over the entire length or almost the entire length in the longitudinal direction, and is formed by a plurality of uneven stripes 2a, 2b parallel to the bent portion 1. It is structured as follows. Furthermore, reinforcing ribs 3 are formed at predetermined intervals on the wavy portion 2, and the reinforcing ribs 3 obliquely intersect with the uneven strips 2a and 2b.

The reinforcing ribs 3 are bulged from the grooves 2a and connect the adjacent protrusions 2b, reinforcing the wavy portions 2 and preventing them from collapsing (see Fig. 3). ). In particular, the reinforcing ribs 3 are
Since it intersects a and 2b in an inclined manner,
This means that the reinforcing effect can be achieved over a wide range in the longitudinal direction. The width of the wavy portion 2 is appropriately set depending on the size of the drain block 7 (see FIG. 5) to be used.

Furthermore, a large number of water passage holes 4 with a hole diameter of about 3 to 6 mm are formed in the corrugated portion 2 at a density of 0.1 to 1 hole/cm ² , so that drainage can be introduced to the drain block 7 side during use. It's becoming like that. In the case of the figure, water holes 4 are formed at predetermined intervals along the bottom of the groove, and water holes 4a having a larger diameter than the water holes 4 are formed at key points. This makes it possible to ensure better drainage.

The water holes 4, 4a include cover A,
This is formed at the same time as the cover A' is formed.To be more specific, as shown in FIG. A needle 9a is formed to protrude corresponding to the perforation site, and a hole 9b into which the perforation needle 9a can be inserted is formed in the other mold, and by clamping the mold 9 having the above configuration, the cover A,
The water passage holes 4, 4a are formed simultaneously with the molding of A'. In order to form the water passage holes 4, 4a in a more perfect circle, the protruding length of the piercing needle 9a is set to a length that allows piercing the foam sheet at the beginning of or during the forming of the foam sheet material. It is preferable to leave it there.

Then, the above two types of covers A with different dimensions,
A' are connected to each other via a flat joint 5, and in use, they are separated from each other from the joint 5, so that one narrow cover A is used for the inner layer, and the other narrow cover A' is used for the inner layer. A wide cover A' is provided for each outer layer (see FIG. 5). In addition,
A groove 5a or perforation for cutting is formed in the joint 5, so that the above-mentioned cutting can be easily performed.

Next, an example of culvert drainage construction using the above-mentioned covers A and A' will be explained with reference to FIG.
A trench 6 with a width of 25 to 30 cm and a depth of 80 to 100 cm is dug, and drain blocks 7 made of expanded polystyrene or other foam forming drain channels 7a are continuously arranged at the bottom.

Next, among the covers A and A' which have been separated from the joint part 5 in advance, first the narrow cover A for the inner layer is bent into an L-shape at the bending part 1 and placed along the drain block 7. . Similarly, the cover A for the inner layer is placed along the drain block 7 with the cover A shifted in position or partially overlapped with the cover A, and the drain block 7 is surrounded by one or more layers of the cover A. After that, for the cover A,
The drain block 7 is surrounded by one or more layers of a wide cover A' for the outer layer.
Then, by backfilling the upper part of the trench 6 with soil 8, culvert drainage is completed.

At this time, at the reinforcing rib 3, the opposing uneven strips 2
Since a and 2b can be prevented from coming into close contact with each other, an appropriate gap can be formed in the wavy portion 2. Further, by surrounding the outer layer side with a wide cover A', it is possible to avoid insufficient dimensions on the outer peripheral side.

Furthermore, as another construction example, as shown in FIG. 6, only the top and both sides of the drain block 7 may be covered with covers A and A'. In this case, construction can be further simplified. It will be possible to achieve this goal.

However, in any of the above construction examples, the surrounding thickness of the drain block 7 by the covers A and A' is as follows:
It varies depending on various conditions such as the water permeability of the soil, the depth of the groove 6, and the width of the groove 6, and a suitable thickness is appropriately selected and constructed depending on these conditions.

Note that as the resin sheets constituting the covers A and A', non-foamed sheets can also be used instead of the foamed sheets described above.

In addition, the narrow cover A for the inner layer and the wide cover A' for the outer layer may be used by connecting them to each other via joints as described above, or when each may be used as a single unit. There are also
In some cases, a plurality of wires having the same width may be connected. In addition, the covers A and A' are not limited to the above-mentioned embodiments. For example, the water passage hole 4 may also be formed in the bent part 1, and the bent part 1 may be formed into a thin pleated shape that makes it easier to bend. The bent part 1 and the wavy part 2 are formed in each cover A, A'.
Various design changes can be made without changing the gist of this invention, such as adding more.

<Effects> As described above, according to the drain block cover of this invention, when in use, an appropriate gap can be formed around the drain block at the corrugated part, so good drainage performance can be ensured, and the synthetic resin sheet Due to its unique rigidity and elasticity, as well as the action of the reinforcing ribs, it has a moderate compressive strength, and even when treading pressure is applied to the soil, the voids around the drain block do not decrease, so it can be used for a long time. Even when used for a period of time, the drainage capacity does not decrease, and furthermore, damage to the internal drain block etc. can be prevented.

Furthermore, it is lightweight and easy to handle and perform construction, it is in sheet form so it is not bulky and transportation costs are low, it is inexpensive, and it is water repellent so it can be easily separated from water and soil. It has various excellent practical effects, such as improved performance.

[Brief explanation of the drawing]

The figure shows an example of this invention.
The figure is a plan view, Figure 2 is a side view, Figure 3 is a sectional view along the line shown in Figure 1, Figure 4 is a sectional view showing the mold, and Figures 5 and 6 are sectional views showing the state of use. It is. DESCRIPTION OF SYMBOLS 1...Bending part, 1a...Bending groove, 2...Wavied part, 2a, 2b...Irregular stripes, 3...Reinforcing rib,
4, 4a'...Water hole, 5...Joint part, 7...Drain block, A, A'...Cover.

Claims (1)

[Scope of claims for utility model registration] 1. The unit cover part consisting of the following ~1
What is claimed is: 1. A drain block cover having at least two parts, the whole being formed in a sheet shape from a synthetic resin sheet. At least one strip-shaped bent portion is formed over the entire length or substantially the entire length. Along both sides of the bent portion, an uneven wavy portion is formed parallel to the bent portion over the entire length or approximately the entire length. Reinforcing ribs intersecting with the uneven stripes are formed in the wavy portion. A large number of water holes are formed at least in the corrugated portion. 2. The drain block cover according to claim 1, wherein two rows of unit cover portions having different width dimensions are connected via a flat joint. 3. Claim No. 2 of the above-mentioned utility model registration claim in which a groove or perforation for cutting is formed in the joint part.
Drain block cover as described in section. 4. The drain block cover according to claim 1, wherein the reinforcing ribs of the unit cover portion obliquely intersect with the uneven stripes of the wavy portion. 5. The drain block cover according to claim 1 of the above-mentioned utility model registration, wherein the bent portion of the unit cover portion has a groove for bending. 6. The drain block cover according to claim 1, wherein the bent portion of the unit cover portion is formed into a thin pleat shape. 7. The drain block cover according to claim 1 of the above-mentioned utility model registration claim, wherein the water passage holes in the unit cover portion are formed to have two types of hole diameters, large and small. 8. The drain block cover according to claim 1, wherein the synthetic resin sheet is a foamed sheet.