JPH01295909A - Underdrainage canal material - Google Patents

Abstract

PURPOSE:To easily construct an underdrainage canal, by fitting a synthetic resin film on the opening section and bottom section of the bag of water resistance having permeability, to fill up the bag with the permeable materials of grains and the like, and by closing the opening section to form underdrainage canal materials. CONSTITUTION:On the opening section 2 and bottom section 3 of a longitudinal bag 1 formed with the network of the water resistance materials of a synthetic resin and the like, a synthetic resin film 4 is pasted, and on the film 4, permeable small slots 6 are scatteringly formed. Then, the bag 1 is filled up with the permeable materials 5 of the grain-shaped materials of the rice hulls and the like of a comparatively high space rate, and the opening section 2 is bound tight with a string 7 or the like and is closed. As a result, the work of an underdrainage canal serving as both drain pile and covering material can be easily executed.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention particularly relates to the use of water-permeable bags made of water-resistant materials, such as net fabric, and other water-permeable materials such as rice husks, granules with relatively large porosity, etc. Regarding the drainage channel material for an underdrain filled with this material, it is possible to construct an underdrain drainage channel without using a normal drain pipe.

[Prior Art] For example, in farmland where the groundwater level is high, culverts are installed to improve water drainage in the soil and drain excess water to make it suitable for growing crops.

Conventionally, this type of underdrain has been constructed by burying drainage pipes such as synthetic resin pipes or clay pipes with numerous water absorption holes to form a conduit, and draining underground water by absorbing water from the joints of the pipes and the water absorption holes. In order to prevent the inflow of earth and sand from the pipe joints and water absorption holes, and to improve the inflow of groundwater, etc., on the pipe,
It was covered with materials such as straw culms with high porosity.

In addition, in recent years, instead of the straw culms, a bag made of net fabric is covered with a covering material filled with granular materials such as rice husk having good water permeability (Japanese Utility Model Publication No. 150022/1983).

[Problems to be Solved by the Invention] However, in the case of the conventional culvert drainage channel, in its construction, a drainage pipe is first installed at the bottom of an excavated trench to form a conduit, and then a covering material is placed on top of it. After covering, the excavated soil must be filled back in, which takes time and effort, and drainage pipes in particular are difficult to handle and the connection work is troublesome. In either case, a drain pipe and covering material are required, making the cost extremely high.

In view of the above, the present invention makes it possible to easily construct an underdrain drainage channel without using conventional drainage pipes, to significantly reduce the cost and labor required for its construction, and to achieve good drainage performance. The aim is to provide drainage channel materials for underdrains that can be secured.

[Means for Solving the Problems] The drainage channel material for underdrains of the present invention which solves the above problems is provided with a water-permeable bag made of a water-resistant material such as a synthetic resin net, and a bag with approximately the same width or width as the bag. A synthetic resin film with a slightly narrow width is pasted to the bag's mouth and bottom, leaving the required length, and the bag is filled with a water-permeable material such as granules with a relatively large porosity to close the bag's mouth. It is characterized by the fact that the part is closed.

In addition, the synthetic resin film mentioned above is made to have approximately the same length as the bag,
Particularly suitable is one in which both end portions remain in the form of flaps and are affixed to the bag.

[Function] According to the drainage channel material of the present invention having the above-mentioned configuration, in order to construct an underdrain drainage channel using the drainage channel material, it is necessary to place the material at the bottom of an excavated trench with the side of the synthetic resin film attached to the bag facing down. All you need to do is to lay them side by side in a row, and then directly backfill with excavated soil on top of them.This creates a drainage channel material made of a water-permeable bag filled with water-permeable material that continues along its entire length. A predetermined culvert drainage channel is constructed.

However, since the drainage channel material of the present invention is made by filling a water-permeable bag such as a mesh bag with a water-permeable material such as granular material having a relatively large porosity, the water-permeable material filled inside the bag can It can withstand soil pressure and maintain a predetermined three-dimensional shape, and also maintain necessary and sufficient water permeability and permeability by maintaining gaps between the filled water permeable materials. Moreover, since there is a synthetic resin film on the lower side of this drainage channel material, groundwater, etc. that flows into and permeates into the drainage channel material from the upper side without the film, is securely retained in the drainage channel material without flowing downward or to the sides. The water is then efficiently distributed and discharged along the drainage channels, and the drainage effect can be improved.

In particular, when the synthetic resin film is attached with both ends left in the form of flaps, the flap-like ends of adjacent drainage channel materials can be overlapped at the bottom during installation. This means that groundwater, etc. that have flowed into the drainage channel material can be reliably drained from the joint portions of the drainage channels without flowing downward and laterally.

[Example code] Next, embodiments of the present invention will be described based on the drawings.

In the figure, (1) is a vertically elongated bag made of mesh fabric (LA) made of a water-resistant material such as synthetic resin, (2) is the opening of the bag, and (3) is the bottom of the bag. One of the front and back sides of this bag (1) is covered with a synthetic resin film (4 sheets) having approximately the same width or slightly narrower width than the flattened bag (1), that is, approximately 1/2 to 1/3 of the bag circumference. ) is attached to the bag (1) with a required length left over the opening (2) and bottom (3). This synthetic resin film (4) may have a length that leaves the opening (2) and bottom (3), but in the case of the embodiment shown in the figure, in particular,
The synthetic resin film (4) is made approximately the same length as the bag (1), and its ends (4a) (4b) are connected to the bag opening (2) and bottom (3).
) is attached to the bag (1) so that it remains in a flap shape. It is desirable that small holes (6) for water permeation be formed in the synthetic resin film (4) at required intervals as shown in the figure. Inside the bag (1) is a water-permeable material (5) such as granules such as rice husks with a relatively large porosity.
The drain material (A) according to the present invention is constructed by filling the drainage channel material (2) with a string (7) or the like and closing the mouth part (2) with a string (7) or the like.

In the above, a bag (1a) made of synthetic resin mesh fabric (1a)
1) is usually formed from a knitted or woven net fabric using monofilament yarn or multifilament yarn of polyethylene, polyvinyl chloride, polypropylene or other synthetic resin, or yarn such as flat yarn of synthetic resin. The mesh of the mesh is formed to a size that prevents the water-permeable material (5) such as granules contained therein from falling out.

For example, using 250-1000 denier thread such as synthetic resin monofilament or flat yarn,
A long cylindrical mesh fabric (1a) is knitted by circular knitting, and while this cylindrical mesh fabric (1a) is fed in a substantially flat state, it is cut into a predetermined length according to the bag length, and the cut ends are cut. One of the parts is closed by fusing, suturing or other means to form a bag (1) with a bottom part (3) and the other part as a mouth part (2).

The synthetic resin film (4) is adhered to the tubular mesh (1a) by melting it as a connecting material on the front and back sides of the tubular mesh (1a) and the blade side, for example, during the feeding process until cutting the tubular mesh (la). The resin (8) is cut into a plurality of elongated strips at the cutting position (C-C) to form the bag opening (2) and bottom (3).
) is coated intermittently except for the required length on the front and back, and on top of this, a synthetic resin film (4) such as a polyethylene film having a long shape with approximately the same width or a slightly narrower width as the tubular mesh fabric (1a) is applied.
Overlap and press to adhere. After that, the bag (1) is constructed by cutting the synthetic resin film (4) together with the tubular mesh fabric (1a) (both cut ends (4a) of the film (4) (4b) ) is not attached to the bag (1) and remains in a flap shape.

The length of these flap-like ends (4a) (4b) varies depending on the bag width, etc., but for example, when the bag width is 20 cm, the mouth side end (4a) is 20eITl, and the bottom side end (4a) is 20eITl.
b) is about 10 marks.

Note that the bag (1) can also be manufactured by intermittently pasting a synthetic resin film (4) cut to a required length in advance to the net fabric (la) according to the length of the bag (1). , also net fabric (
After producing the bag (1) according to 1a), a synthetic resin film (4) can also be attached.

Then, the bag (1) is filled with a water-permeable material such as rice husk, and the opening (2) is opened with the mesh fabric (1a) under some tension.
By tying them together with strings (7) or the like, the drainage channel material (A) of the present invention having a three-dimensional shape can be obtained.

In addition to the above embodiments, the synthetic resin film (4) may be attached to the bag (1) by bonding only the opposite ends of the film (4) to the mesh fabric (1a) of the bag (1). Alternatively, the film can be adhered in various ways, such as adhering to the knitted fabric (1a) over the entire width of the film, or adhering in strips in the width direction. It is also possible to adhere by other means such as heat fusion or sewing, but from the viewpoint of adhesion strength etc., it is preferable to adhere by using molten resin (8) as described above.

In addition, the bag (1) may be constructed using a tubular mesh fabric knitted into a cylindrical warp shape using a double raschel machine, or a single long mesh fabric knitted or woven may be folded in half. At the same time, it is also possible to produce a bag (1) with the synthetic resin film (4) affixed in the same manner as above by closing both ends of the bag with sutures or heat-fused pipe means to form a cylinder. It is. In addition, the bag can also be made of a synthetic resin net made by means other than knitting or weaving, or it can be made of various non-woven fabrics or other water-resistant materials with appropriate water permeability. It is also possible to construct the bag using sheet-like fabric.

The diameter, length, etc. of the above-mentioned vertically long bag (1) can be determined arbitrarily depending on the mode of use, but for example, water permeable material (5
) when filled with diameter 5-25 mm s length 1-4
It is suitable for use to have a diameter of about m, but it is of course possible to use dimensions other than the above.

In addition, the shape of the bag (1) is not limited to a substantially cylindrical shape when filled with the water-permeable material (5), but can be any three-dimensional shape that can function as a drainage channel. good.

As the above-mentioned water-permeable material (5), it is preferable to use rice husk, which is produced in large quantities in agricultural production areas, is lightweight, has a large porosity, has excellent water permeability, and is difficult to rot. It is possible to use foamed particles of synthetic resin such as expanded polystyrene, which has a similar porosity and excellent water resistance, as well as crushed gravel or shells, chips of crushed wood or synthetic resin, or Materials with relatively large porosity and water permeability necessary for drainage can be used, such as corrugated paper liner cut into small pieces or wheat stalks. Among them, lightweight materials such as foamed particles facilitate the burying work, and water-resistant materials are resistant to decay, so they can maintain good water permeability over a long period of time, increasing their durability.

The bag (1) is filled with the water-permeable material (5) by mechanical means such as a compressor-type filling machine (in the case of lightweight materials such as rice husks or expanded particles) or by human means. After filling, the opening (2) can be tied up with the above-mentioned string (7), etc., or can be tied up with the extra length of the bag (1), or closed off with heat-sealing means, etc. It can be closed with

To construct an underdrain drainage channel using the above drainage channel material (A), excavate with the synthetic resin film (4) attached to one of the front and back sides of the bag (1) facing down as shown in Figure 2. These are laid side by side in succession at the bottom of the groove (10), and the opening (2) of this bag removal bag (1) is placed first on the bottom (3) of the bag of drainage channel material (A). Lay each drainage channel material on top of each other (A)
Continuing.

The synthetic resin film (4) has a flap-like end (4a) (
4b), adjacent drainage channel materials (A) (A)
The bag opening (2) and bottom (3) are overlapped so that the flap-shaped ends (4a) and (4b) of the bag are overlapped at the bottom. In this way, excavation is carried out directly on the drainage channel material (A).
If (11) is backfilled, a bag (1) made of net fabric (1a) is obtained.
The drainage channel material (A) filled with a water-permeable material (5) is continuous along the entire length to form an underdrain drainage channel with good drainage performance.

That is, a bag (1) made of mesh fabric (1a) is filled with a water-permeable material (5) with a relatively high porosity, such as rice husk, and the water-permeable material (5) inside the bag (5) resists earth pressure. In order to withstand sufficiently, maintain a predetermined three-dimensional shape, and maintain good water permeability due to the gap created by the water-permeable material (5), groundwater etc.
), water is absorbed into the drainage channel material (A), and is drained through the drainage channel material (A).

In particular, since there is a synthetic resin film (4) in the lower half, groundwater, etc. that flows into and seeps into the drainage channel material (A) from the upper side without the film can be drained without flowing downward or to the sides. This film is held in the road material (A), and the film (4) is attached to the bag (1) with the required length remaining between the mouth (2) and the bottom (3). (4) does not obstruct the flow of water even at the joint between the mouth part (2) and the bottom part (3), and this drainage channel material (A) can flow well and drain water.

The flap-shaped end (4a) of the synthetic resin film (4)
) If (4b) is overlapped, drain material (A)
Groundwater, etc. that have flowed into the joint can be drained more efficiently without flowing downward and laterally.

Further, if the synthetic resin film (4) is provided with small holes (6), groundwater etc. can permeate through the small holes (8) from below and from the sides and be discharged.

[Effects of the Invention] As described above, the drainage channel material of the present invention includes a water-permeable bag with a synthetic resin film pasted on the circumferential half side, and a water-permeable material with a relatively large porosity such as granules. This material is filled with water and is designed to function as both a conventional drainage pipe and a covering material, so it is possible to achieve good drainage by simply arranging this drainage channel material, without using a drainage pipe made of rigid material. It is possible to construct an underdrain drainage channel with a culvert, and its construction work can be significantly simplified. In particular, this drainage channel material is easy to change in diameter and length due to its structure, is lightweight and easy to handle, and can be easily deformed by bending during construction. Therefore, construction work such as connections within the excavated trench can be carried out efficiently, and the cost and labor required for the underground construction can be significantly reduced, and the culvert drainage channel can be constructed at low cost.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view, FIG. 2 is an enlarged cross-sectional view of the same as the above, and FIG. FIGS. 4A and 4B are a side view and a sectional view showing the buried state of use, and FIG. 5 is an enlarged cutaway view of the same part. (A)...drainage channel material, (1)...bag, (1a)...
・Net fabric, (2)...mouth, (3)...bottom, (4)
... Synthetic resin film, (4a) (4b) ... Flap-shaped both ends, (5) ... Granular material, (6) ...
Small hole, (7>... string. Patent applicant: Taitoyo Chemical Industry Co., Ltd.

Claims (1)

[Claims] 1. A synthetic resin film having approximately the same width or a slightly narrower width as the bag is attached to a water-permeable bag made of a water-resistant material, leaving a required length at the mouth and bottom of the bag. A drainage channel material for an underdrain, characterized in that the bag is filled with a water-permeable material such as granular material having a relatively large porosity, and the mouth of the bag is closed. 2. The drainage channel material for an underdrain according to claim 1, wherein the synthetic resin film is made to have approximately the same length as the bag, and both ends of the film are left in the form of flaps and are attached to the bag.