JPS5925950Y2 - Underdrain drainage structure - Google Patents

Description

[Detailed description of the invention] This invention relates to an underdrain drainage structure, and is an attempt to obtain a structure that can easily accommodate required drainage volumes that vary depending on construction conditions and the like.

In general, moisture in the soil is essential for crop growth, but in low-swamp fields with high groundwater levels or fields with heavy, dense soil and poor permeability, excessive soil moisture due to heavy or long rains can cause crops to grow. Many problems arise, including poor growth, poor germination, and the occurrence of diseases.

For this reason, it is necessary to construct underdrainage to ensure proper soil drainage.

Traditionally, culverts were constructed by burying knotted bamboo tubes, cypress, etc. in trenches dug in the ground to improve soil drainage, but bamboo tubes and cypress are simply inconvenient to handle. However, it has the disadvantage that it is susceptible to corrosion due to the action of bacteria in the soil.

Therefore, metal pipes, clay pipes, etc. were buried in place of bamboo tubes and cypress, and stones and bricks were used.

Construction is also done with concrete, etc., but it is expensive and water can only flow in from the ends of pipes, etc., so it is not suitable for culverts to improve drainage of large areas of soil such as agricultural land. It was inappropriate.

Therefore, in recent years, underdrain drainage blocks made of hard synthetic resin foam have begun to be used as they are easy to construct as underdrain drainage, practical, lightweight, and have excellent corrosion resistance and elasticity. (Refer to Publication No. 14914), has achieved good results, but in order to respond to the required drainage amount, which varies depending on the construction conditions such as the soil quality of the construction site, the shape of the culvert block, especially the selection of the cross-sectional area of the drainage ditch, becomes a problem. If the drainage ditch is too small in relation to the amount of water discharged, sufficient drainage cannot be achieved, and conversely, if the drainage ditch is too large, it will be wasteful and uneconomical.

Therefore, this idea uses underdrain blocks of a certain shape and is designed to easily accommodate the above-mentioned differences in required drainage volume.The structure is made of a hard synthetic resin foam. An underdrain drainage structure in which multiple rows of underdrain blocks are arranged in parallel, and the multiple rows of underdrain blocks are wrapped with a net-like filter and buried in the soil, with the center vertical wall of the underdrain block as the border. A plurality of rows of drain grooves are formed in the longitudinal direction on both side surfaces, and communication grooves are formed vertically at small intervals at the boundary between the plurality of rows of drain grooves, and further, the central vertical wall This feature is characterized in that through-holes are formed in the horizontal direction so that the drain grooves on both sides communicate with each other.

Next, embodiments of this invention will be illustrated below with reference to the drawings.

Reference numeral 1 denotes an underdrain block made of a hard synthetic resin foam, for example, expanded polystyrene.As will be described later, the underdrain block of a required length has fitting parts at both ends, and a plurality of pieces are connected to each other. The underdrain blocks 1 are connected in series by fitting to form one row, and each underdrain block 1 has a drainage groove 2 formed therein.

In addition, in Fig. 1, there are two rows of culvert blocks 1 in the vertical direction (up and down), and in Fig. 2, there are two rows in the vertical direction and three rows in the horizontal direction, a total of six rows of culvert blocks 1.
However, the number of columns is 3 in addition to the above.
~ 5 rows or 7 or more rows may be required, and the required drainage amount and 1
This can be determined by considering the drainage capacity per row.

In particular, if multiple rows are arranged in parallel in the vertical direction, drains can be placed even in high positions, which is extremely convenient for maintaining the water level.

A filter 10 made of plastic net or the like is wrapped around the outer periphery of the underdrain block 1, and if only the entire multiple rows of underdrain blocks 1 are wrapped with the filter 10 (
Figure 1) and filter 1 for each row of culvert block 1.
0' and then the whole thing is wrapped with another filter 10 (Fig. 2). In the latter case, it is possible to more reliably prevent dirt from entering the drainage ditch 2 formed in the underdrain block 1. It can be prevented.

The underdrain block 1 wrapped with the filter 10 in this manner is buried in a trench 20 dug at the construction destination, and the periphery of the underdrain block 1 is filled with a filling hydrophobic material 30 made of synthetic resin or other material. Further, the upper part of the trench 20 is backfilled with soil 40 to form an underdrain drainage.

As shown in FIGS. 3 to 6, the above-mentioned culvert block 1 has a plurality of rows (two rows in the figure) of drainage grooves 2, 2 formed in the longitudinal direction on both sides bordering on the central vertical wall 5. , left and right fitting parts 7 a and 7 b are formed at both ends, and in the left and right fitting parts 7 a and 7 b, the concave part a and the convex part are formed to be opposite to each other. As the left and right fitting parts at one end, for example, each fitting part 7 a , 7 b on the front side, and each fitting part 7 a , 7 b on the left and right at the other end corresponding to the rear side.
Also, the concave portion a and the convex portion S are formed to be opposite to each other,
The culvert drainage blocks can be connected to each other at their ends, and communication grooves 4, 4 are vertically formed at small intervals in the boundary parts 3, 3 between the plurality of rows of drainage grooves 2, 2. It is convenient to cut this as appropriate and use it, and it is possible to easily and reliably join blocks that are sequentially cut together.

In addition, a through hole 5' is formed in the horizontal direction in the central vertical wall 5.
The drainage channels communicate with each other, making it easier for drainage to flow.

In addition to the above-mentioned foamed polystyrene, the synthetic resin hard foam forming the underdrain block 1 may include polyethylene,
Foams made from polypropylene, polyvinyl chloride, copolymers based on these, etc. are suitable.

According to the above-described underdrain drainage structure of this invention, multiple rows of underdrain blocks are wrapped together with a net-like filter, so it is possible to bury the blocks in the soil without disturbing the arrangement. It becomes easier.

In addition, in practice, by keeping the drainage volume of the basic culvert block itself relatively small and increasing the number of rows of culvert blocks as the required drainage volume increases, the culvert drainage as a whole can always maintain an appropriate drainage capacity. There is no waste and it is economical.

In addition, it is sufficient to combine a plurality of rows of underdrain blocks with a constant shape and the same shape of drainage grooves formed in the underdrain blocks, making it easy to manufacture and reducing production costs.

Further, since the underdrain block has the above-described structure, drainage will not be hindered even if the drainage channel is partially blocked.

In particular, when the underdrain blocks are arranged in a plurality of rows in the vertical direction, it becomes easier to maintain the water level.

Furthermore, even if it is necessary to change the drainage volume after construction, this can be easily and conveniently done by adding or reducing the number of rows of underdrain blocks, which are made of hard foam and are lightweight and easy to handle.

Therefore, the underdrain drainage structure of this invention can be easily and inexpensively constructed in accordance with the required amount of drainage, and is extremely effective in practical use.

[Brief explanation of the drawing]

The figures illustrate an embodiment of this invention, and FIG. 1 is a sectional view, FIG. 2 is a sectional view of a modified example, FIG. 3 is a perspective view showing an example of a culvert block, and FIGS. The figure is the previous figure IV-
FIG. 3 is a cross-sectional view taken along line IV, line ■-■, and line VI-VI. 1...Drain block, 2...Drainage ditch,
3... Boundary part, 4... Communication groove, 5...
...Central vertical wall, 5'...Through hole, 1010
'...Filter, 20...Groove, 30
...Filled hydrophobic material 40...Soil.

Claims (1)

[Claim for Utility Model Registration] Multiple rows of underdrain blocks formed of a hard foam made of 16-acid phase resin are arranged in parallel, and the multiple rows of underdrain blocks are wrapped with a net-like filter and submerged in the soil. This is a buried underdrain structure, in which multiple rows of drainage grooves are formed in the longitudinal direction on both sides of the underdrain block bordering the central vertical wall, and the drainage grooves between the multiple rows of drainage grooves are Communication grooves are formed in the vertical direction at small intervals in the boundary part, and through holes are formed in the horizontal direction in the central vertical wall so that the drain grooves on both sides communicate with each other. Features a culvert drainage structure. 2. The underdrain drainage structure according to claim 1, which is comprised of a plurality of underdrain blocks arranged vertically in parallel. 3. The underdrain drainage structure according to claim 1, wherein the underdrain block is made of expanded polystyrene.