JPS626046B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a construction method for underdrain drainage, which makes it extremely easy to connect blocks at the branching part of the underdrain drainage, and also makes the connection reliable and eliminates unevenness of the drainage channel at the branching part. ing.

Moisture in the soil is generally essential for crop growth, but in fields in low-swamp areas with high groundwater levels or fields that are heavy and dense and have poor permeability, heavy or long rains can cause excess moisture in the soil. This causes many problems such as poor crop growth, poor germination, and disease outbreaks. 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 a trench dug in the ground to improve drainage of the soil, but bamboo tubes and cypress are not only inconvenient to handle, but also difficult to handle. The drawback was that it was susceptible to corrosion due to the action of bacteria in the soil. For this reason, metal pipes, clay pipes, etc. are buried in place of bamboo tubes and bamboo pipes, or structures are constructed with stones, bricks, concrete, etc., but these are expensive and the inflow of water is limited from the ends of the pipes. Therefore, it was unsuitable for use as a culvert to improve drainage in large areas such as agricultural land.

Therefore, in recent years, underdrain drainage blocks made of hard synthetic resin foam have been used with good results as they are easy to construct, practical, lightweight, and have excellent corrosion resistance and elasticity. Particularly, in the construction method according to the present invention, the above-mentioned blocks can be connected easily, quickly and reliably at the branching part of the underdrain drainage, and moreover, the drainage path at the branching part is made to be evenly distributed. In other words, the construction method involves inserting the required length of a synthetic resin underdrain block, which has drainage grooves in the longitudinal direction on both sides of the central vertical wall, and connecting ports on three or more sides. When connecting underdrain drainage blocks in a T-shape or cross shape using a T-shaped or cross-shaped connection cover formed in A through-hole is previously formed at a position communicating with the remaining connection opening that is perpendicular to this, and the underdrain drainage block is communicated with the underdrain drainage block on the side of the remaining connection opening that is perpendicular to the through-hole. The feature is that the underdrain drainage block is connected on three or more sides.

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

In Fig. 1, 10 is a connection cover, which has two connection openings 1 facing each other so that it can be branched into a T-shape.
1 and 12, and a connection port 13 perpendicular to these, and each connection port 11, 12, 13
The underdrain drainage blocks 1, 1', and 1'', which will be described later, can be connected to each other by inserting the required length into them.This connection cover 10 may be made of hard synthetic resin, but In order to facilitate the insertion of the underdrain drainage blocks 1, 1', 1'', a slightly soft and flexible material such as resin is suitable. When connecting an underdrain drainage block in a T-shape using such a T-shaped connection cover 10, in this invention, the underdrain drainage block inserted in the direction connecting the two opposing connection openings 11 and 12 is used. 1 has a through hole 6 formed in advance at a position leading to the remaining connection port 13 orthogonal thereto, and the through hole 6 allows the underdrain drainage on the side of the remaining connection port 13 orthogonal to the through hole 6. If you make it compatible with block 1'',
The central vertical wall 5 allows the drainage water to flow evenly without any deviation in the flow path (see Figures 1 to 3).

There are various specific examples of forming the above-mentioned through holes, and some examples will be listed below. In the case where the through hole 6 is formed in a part of one underdrain block 1 that can reach both the two opposing connection openings 11 and 12 sides of the connection cover 10 or is connected to blocks on both sides ( (See Figures 1 to 3 or Figures 4 and 5 above)
can be mentioned first. Next, the through holes 6, 6 are inserted through the two opposing connection openings 11, 12 of the connection cover 10, and the through holes 6, 6 are adjacent to each other and communicate with each end of the two underdrain blocks 1, 1' which are butted against each other. ' (see Figures 6 and 7),
Furthermore, a through hole 6'' is formed only at one end of the two underdrain blocks 1 and 1' that are butted together in the same manner as above, and the side of the underdrain drainage block 1 where this through hole 6'' is located is located deeper than the intermediate position between the two. It is also possible to butt them together while they are inserted into each other (see Figure 8).

Note that in any of these cases, the shape of the through hole can be implemented in various shapes other than those shown (see, for example, FIGS. 9 and 10).

The underdrain drainage block 1 connected by the connection cover 10 as described above is used at the construction destination with a filter 70 made of plastic net etc. (former rice paddies, etc.) width 25-30cm, depth 80cm
A trench of ~100 cm is dug 80, and underdrain drainage blocks 1, 1', 1'', etc. are lined up at the bottom of the trench, and around the blocks, a hydrophobic material such as foamed resin is filled to a thickness of 5 to 10 cm. 90. After this, fill the upper part of the trench 80 with about 50 to 70 cm of field soil 1.
By backfilling 00, underdrain drainage is completed (see Figures 11 and 12).

A preferred example of the synthetic resin underdrain drainage blocks 1, 1', 1'', which are connected and used in the connection cover, is as shown in Figs. Drain grooves 2, 2 are formed in the longitudinal direction on both sides, and fitting parts 7a, 7b divided into left and right parts are formed at both ends.
In this case, the concave portion a and the convex portion b are formed to be opposite to each other, and the left and right fitting portions at one end are, for example, the respective fitting portions 7a and 7b on the front side and the left and right fitting portions at the other end corresponding to the rear thereof. Also in the joining parts 7a and 7b, the recessed part a and the raised part b are formed to be opposite to each other, so that the underdrain drainage blocks can be joined to each other at the ends, and furthermore, the boundary part 3 between the plurality of rows of drain grooves 2, 2 is formed. , 3 are formed with communication grooves 4, 4, which are conveniently cut and used, and the joining of blocks that are not successively connected can be done easily and reliably (blocks 1', 1''). In the case of , Datsushiyu and Tsudatsushiyu are written for each part).

In addition, FIG. 17 shows connection ports 11, 12, 13.
Slits 21, 22, 23 are formed in the locking tools 24, 24', 2 so that they can be expanded and contracted freely.
5, 25', 26, 26' are provided to facilitate the insertion and removal of the underdrain drainage blocks 1, 1', 1'', . . . by the connection cover 20.

Furthermore, FIGS. 18 to 20 show an appropriate number of sheet-like or plate-like structural pieces 31, 31 that can be bent as a whole.
. . . shows a connection cover 30 formed in a freely assembling manner, and among the component pieces 31, 31 .
3' is provided for free assembly and folding, in particular in this case the component pieces 31,
31... are transparent, the state in which the underdrain drainage block 1 is inserted into the interior can be seen through, improving workability.
In addition, when using the connection cover 30 that can be assembled freely in this way, the underdrain drainage blocks 1, 1', 1''...
It has the advantage of being able to cover objects that have been joined in a T-shape in advance.

Furthermore, as an example of a modification of the connection cover used in construction, there is a pair of connection covers 40 that have a planar shape corresponding to the connection form to the underdrain drainage block and are formed in the shape of a gutter that can be fitted into the upper and lower parts of the block, respectively. , 40 can also be used, especially those having fitting parts 44, 44 that can be inserted into the drain grooves 2, 2 of the block 1, and which can be inserted into the insertion part or the side surface of the block 1. protrusion 45,
46 (see FIGS. 21 to 25). In this case, 41, 42, and 43 indicate connection ports.

Although not shown, a cross-shaped connection cover may be used to branch connections in all directions within the scope of the present invention.

As described above, according to the present invention, the underdrain drainage blocks made of synthetic resin having drainage grooves in the longitudinal direction on both sides of the central vertical wall can be used to drain water at locations where branching is required. When the length is inserted into the connection opening of a connection cover that is T-shaped or cross-shaped and connected, there is a block that is inserted in the direction that connects the two opposing connection openings. A through hole is previously formed at a position communicating with the remaining orthogonal connection openings, and the underdrain drainage block is connected to the block on the side of the remaining connection openings that are orthogonal to each other through the through hole. Because the construction is connected on three or more sides like a shape or a cross shape, as mentioned above, the drainage channels formed by the left and right rows of underdrain drainage blocks are not biased and can form an even drainage channel, ensuring smooth drainage flow. Construction is possible. In addition, this invention enables construction using the above-mentioned connection cover to quickly and reliably form the branching part of the underdrain drainage, and further strengthens the reinforcing properties at the branching part. It is a great thing to be able to contribute to the spread of technology.

[Brief explanation of the drawing]

The figures illustrate embodiments of the present invention, and Fig. 1 is a perspective view showing the T-shaped connection state during construction, Fig. 2 is a front view showing the through hole side of the underdrain drainage block, and Fig. 3 is a perspective view showing the T-shaped connection state during construction. Figure 1: Cross-sectional view in connected state,
Fig. 4 is a front view of the block showing an example of a change in the shape of the through hole, Fig. 5 is a cross-sectional view of the block when connected using the one in the previous figure, and Fig. 6 is a front view of the block showing an example of a change in the through hole side. Figure 7 is a cross-sectional view of a connection using the one in the previous figure, Figure 8 is a cross-sectional view showing an example of a change in the through-hole side, and Figure 9 is a block diagram showing an example of a change in the shape of the through-hole. 10 is a cross-sectional view along the line from the front figure, Figure 11 is a cross-sectional view of construction, Figure 12 is a cross-sectional view after construction is completed along the line from the front figure, and Figure 13 is a connection using a connection cover. FIGS. 14 to 16 are sectional views taken along lines -, -, and - in the previous figure; FIG. 17 is a perspective view showing an example of a modification of the connection cover; and FIGS. Fig. 20 is a perspective view showing a modification of the connection cover, Fig. 21 is a perspective view showing a pair of upper and lower connection covers, Fig. 22 is a sectional view when the cover shown in the previous figure is used, and Fig. 23 is the cover shown in the previous figure. FIG. 24 is a perspective view showing a further modified example of the cover, and FIG. 25 is a sectional view when the cover shown in the previous figure is used. 1, 1', 1''...Underdrain drainage block, 2,
2', 2''...drainage ditch, 5, 5', 5''...vertical wall,
6, 6', 6''...through hole, 10, 20, 30, 4
0...Connection cover.

Claims (1)

[Scope of Claims] 1. Connecting openings on three or more sides that can be connected by inserting a required length of a synthetic resin underdrain drainage block having drainage grooves in the longitudinal direction on both sides of the central vertical wall as a boundary. When connecting underdrain drainage blocks in a T-shape or cross shape using a T-shaped or cross-shaped connection cover formed in A through-hole is previously formed at a position communicating with the remaining connection opening that is perpendicular to this, and the underdrain drainage block is communicated with the underdrain drainage block on the side of the remaining connection opening that is perpendicular to the through-hole. A construction method for culvert drainage characterized by connecting culvert drainage blocks on three or more sides. 2. A through hole is formed in a part of one underdrain block that extends to both of the two opposing connection opening sides of the connection cover or is connected to blocks on both sides. Construction method of culvert drainage described in section. 3. The above-mentioned claim 1, in which through-holes are formed adjacently and in communication with each end of both underdrain blocks that are inserted through the two opposing connection openings of the connection cover and abutted against each other. Construction method of culvert drainage described in section. 4 A through hole is formed in only one end of the two underdrain blocks that are inserted through the two opposing connection openings of the connection cover and butted against each other, and the side of the underdrain drainage block where this through hole is located is formed. 2. The method for constructing underdrain drainage according to claim 1, wherein the culverts are butted together in a state where they are inserted deeper than an intermediate position between the two. 5. The construction method for underdrain drainage according to claim 1, using a connection cover that has at least a connection opening that can be freely expanded and contracted. 6. The underdrain drainage according to claim 1, in which the connection cover is formed of a component piece that can be bent in its entirety so that it can be assembled freely, and an engagement tool is provided at the bending meeting part of the component piece. construction method. 7. The construction method for underdrain drainage according to claim 1, using a connection cover made entirely of a flexible material.