JPH11332405A - Raft for plant culture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a plant-culturing raft that has high durability with increased stability, can control its buoyancy and can cultivate the plants effectively for improving the water quality. SOLUTION: A plurality of used LPG bombs 10 are attached to a raft structure 100 as buoys and plant-culturing cases are set on the raft and a plant is cultivated in the plant-culturing cases. The LPG bomb is provided with the upper and lower ports A, B, and pipes 11, 11 are connected to these ports and have their openings higher than the LPG bomb at the other ends. Thus, water is fed through the pipes into the bomb and compressed air is forced via the pipe 11 connected to the upper port into the bomb and simultaneously water is excluded from the lower port to control the buoyancy of the whole raft body. Metal ring connectors are attached to the edges on both left and right sides at the front and the rear of the raft structure and connection levers are inserted into the ring connectors whereby a plant-culturing raft can be connected to another raft.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plant cultivation raft capable of cultivating plants on a lake or the like, and more particularly to a plant cultivation raft capable of adjusting the buoyancy of the entire raft.

[0002]

2. Description of the Related Art In recent years, eutrophication of lakes, marshes and dams, which are water sources for waterworks, has been progressing worldwide due to pollution of water quality. Plants are cultivated as an effective countermeasure against such eutrophication. It is already known from many literatures that nitrogen and phosphorus are surely absorbed.

Conventionally, as such a plant cultivation raft, for example, a raft is fixed thereon using buoyancy by a drum can, and a box for plant cultivation is fixed thereon to cultivate plants such as papyrus and kenaf. That was being done. Some of such plant cultivation rafts utilize styrene foam as a material having a large buoyancy.

[0004]

However, the conventional drum can lacks durability, and a long time use causes a hole in the can wall due to corrosion, so that a sufficient buoyancy as a plant cultivation raft is secured. There were problems such as being unable to do so. Also, in the case of using conventional styrofoam, however, if the styrofoam is too light and the plant mounted thereon grows and becomes taller, the raft loses its balance and overturns. was there.

On the other hand, in recent years, LPG has been
LPG gas cylinders, which are pressure vessels for enclosing and supplying gas, generate millions of used cylinders whose expiration date has expired for 20 years.
It is not easy because of environmental degradation. Also, most of such expired cylinders still have sufficient durability even though the expiration date has expired.

Therefore, in view of the above-mentioned problems in the prior art, the present invention makes effective use of expired LPG gas cylinders, which should be disposed of, and has high durability, stability and buoyancy. An object is to provide a plant cultivation raft that can be adjusted. Another object of the present invention is to provide a plant cultivation raft that enables large-scale plant cultivation to prevent eutrophication of lakes and dams.

[0007]

Therefore, in order to achieve the above object, the present invention first provides a plurality of used LPG cylinders arranged side by side on a raft structure,
A plant cultivation box for plant cultivation is attached to this raft structure, and a plant cultivation raft for cultivating plants in the plant cultivation box. Said L
The PG cylinder is provided with two ports at the top and bottom. Pipes are connected to these ports to open at a position higher than the LPG cylinder, and high-pressure air is pumped from the pipe connected to the upper port. And draining water from a pipe connected to the lower port to
Adjust the amount of water in the PG cylinder. Thereby, the L
It is possible to adjust the buoyancy of the entire raft by adjusting the buoyancy of the PG cylinder.

[0008] In the plant cultivation box, a cultivation floor for vegetation of the plant is provided, and the plant is vegetated here. At the front, rear, left and right ends of the raft structure, connecting means for connecting to another raft structure are provided. As a result, a plurality of raft structures are connected and floated on a lake or the like, enabling large-scale plant cultivation.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. First, attached FIGS. 2 to 6 show a plant cultivation raft according to an embodiment of the present invention. In these figures, a plurality (eight in this example) of pressure vessels as buoyancy members are used. A used LP
Are alternately arranged in opposite directions so that their heads are on the inside. The plurality of LPG cylinders 10, 10,... Which are buoyancy members are attached to the raft structure 100 of the plant cultivation raft. Note that the raft structure 100 is formed into a square raft shape by assembling wood, for example, or assembling steel frames by welding or the like. The raft structure 100 according to this embodiment
Has a length (L) of about 3 m and a width (W) of 2.1 m.

As shown in these figures, a plate or the like is laid at the center of the raft structure 100 so that
And a plurality (eight in this example) of plant cultivation boxes 120, 120... Filled with soil or the like as cultivation beds are attached to both sides of the passage portion 110. In addition,
In these plant cultivation boxes 120, 120, for example, plants such as papyrus and kenaf are cultivated, and as a result, lakes, dams and dams serving as water sources of waterworks whose eutrophication is progressing due to water pollution. As described above, nitrogen and phosphorus are surely absorbed from water, and this is an effective measure against eutrophication.

Next, FIG. 1 shows an LPG cylinder 10 which is a used pressure vessel attached to the raft structure 100 and used as a buoyancy member. The LPG cylinder 10 has a wall pressure of 4.5 mm on the outer wall. However, if the heavy metal or the like is adhered to the inside of the LPG cylinder 10 or a heavy metal or the like is adhered to the LPG cylinder 10, the surface of the cylinder is prevented from being eluted. It is preferable to apply an epoxy paint or the like to the inner surface.

FIG. 1 shows an LPG cylinder 10 which is a used pressure vessel attached to the raft structure 100.
As shown in FIG. 2, two ports A (upper side) and B (lower side) are provided above and below, and these ports A and B are respectively provided with:
Pipes 11, 11 are connected. These pipes 11, 11 extend to a position higher than the horizontal LPG cylinder 10, and are opened via joints 12, 12 attached to the ends thereof. As is clear from FIG. 1, in the present embodiment, an inner pipe 13 that is disposed to penetrate deep into the LPG cylinder 10 is connected to the upper port A of the ports. Have been.

In the example shown in the figure, the lower port B is not connected to a pipe extending inside the LPG cylinder 10, but the lower port B is also connected to an internal pipe, and the tip thereof is connected to the lower port B. It is also possible to arrange it at the bottom in the LPG cylinder 10 (indicated by a broken line 15 in the figure). According to such a structure, as described later, once the LPG cylinder 1
Most of the water introduced into the chamber can be discharged to the outside if necessary.

According to the LPG cylinder 10 which is a buoyancy member having such a structure, compressed air (high-pressure air) is supplied from the upper port A to the pipe 11 through the joint 12 by, for example, a portable micro compressor (not shown). , The amount of air in the cylinder increases, and the water in the container is discharged from the lower port B to the outside. Thereby, the buoyancy of the LPG cylinder 10 increases. Conversely,
When water is supplied from the port A, water enters the container of the LPG cylinder 10 and the buoyancy is reduced. That is, according to the plant cultivation raft according to the present invention, the amount of water in the LPG cylinder 10 is adjusted in this manner. This makes it possible to adjust the buoyancy and balance of the LPG cylinder 10, which is a buoyancy member, so that the entire raft does not tilt and reaches a predetermined drafting position. The work is also carried out, for example, as shown in FIG. 2 described above, by connecting pipes 11, 11,... Which are erected on both sides of a passage 110 provided at the center of the raft structure 100. This can be easily performed while attaching and detaching the exhaust port of the portable micro compressor.

By the way, as a plant cultivation raft, the necessary conditions are as follows. Durability, B. Wave resistance, C.I. Stable
Safety, D. Buoyancy adjustability with plant growth; Raft connectivity for large-scale cultivation; It is required that it can be manufactured at low cost.

According to the above requirements for the plant cultivation raft, the above-described plant cultivation raft according to the present invention,
The LPG cylinder 10 as a buoyancy member has a wall pressure of 4.5 mm on its outer wall, and is excellent in durability as compared with a conventional empty drum. In addition, LPG cylinder 10
Has a capacity of 100 liters and weighs about 50 kg, which makes it possible to construct a raft with a low center of gravity. Compared with the conventional method, when a tall plant such as papyrus, which is buoyant but has too light a buoyancy and is a mounted plant, such as papyrus, grows, it may lose its balance and capsize. On the other hand, in the plant cultivation raft of the present invention using the LPG cylinder, since the buoyancy member itself has a sufficient weight, it is possible to construct a raft having a low center of gravity, and tall plants can be grown. You will not lose your balance and overturn. That is, papyrus is suitable for cultivation of resource crops such as kephna.

As for stability and safety, as described above, in the plant cultivation raft according to the present invention, for example, an operator, a visitor, or the like is provided at the center of the raft structure 100 in the vertical direction. A passage portion 110 for riding is formed, and necessary work can be performed here. Further, by adjusting the buoyancy and balance of each buoyancy member, it is possible to prevent the entire raft from inclining, and the danger due to falling water is small, stable and safe. Further, in the cultivation of terrestrial plants, there is a literature that a minimum height of about 100 mm from the water surface is required, but drafting gradually decreases due to plant growth, and the plants die. However, in the plant cultivation raft of the present invention, as described above, the upper and lower two ports A and B provided on the LPG cylinder 10 as its buoyancy member and the pipes 11 and 11 thereof.
By utilizing water, the draft can be lowered by putting water into the cylinder in advance, and the buoyancy can be adjusted by discharging the water in the cylinder to the outside according to the growth of the plant, thereby increasing the draft.

Furthermore, since LPG cylinders 10 used as buoyancy members in plant cultivation rafts generate millions of unused cylinders every 20 years, which have expired for 20 years, they are used almost completely free of charge. That is, the plant cultivation raft can be completed at extremely low cost. In addition,
It is costly to dispose of these used cylinders, but effective reuse of such used cylinders, as in the present invention, is not expected to contribute to society. Needless to say.

In addition, especially when municipal sewage is used as a water supply source, a large amount of nitrogen and phosphorus will be supplied every day. The required kenaf cultivation area is 50,000 m2. Thus, when a plant cultivation raft having a large area is required, it is conceivable to connect a large number of these rafts vertically and horizontally. Therefore, in the present invention, as shown in the attached FIG. 7, a connecting means for connecting to another plant cultivation raft is provided on the outer frame of the raft structure 100. The connecting means may be, for example, connecting ring fittings 15 attached at different heights to the front, rear, left and right ends of the raft structure 100.
., Which are connected to each other as shown in FIG.
It is connected by 51 or the connection rod 151 is pulled out to eliminate the connection state, which is useful for automatic harvesting of resource plants and the like.

[0020]

As is clear from the above description, according to the plant cultivation raft according to the present invention, the expired LPG gas cylinder, which should be disposed of, is effectively reused, and has high durability and stability. Further, the present invention provides a plant cultivation raft capable of adjusting its buoyancy, and exhibits an excellent effect of contributing to society.

In the present invention, the plant cultivation raft is
Large-scale plant cultivation to enable large-scale plant cultivation by allowing large numbers of plants to be easily connected, especially to prevent eutrophication of lakes and dams supplied with large amounts of nitrogen and phosphorus daily It has an excellent effect of enabling

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view and a side view illustrating the structure of an LPG cylinder as a buoyancy member that is a feature of a plant cultivation raft according to the present invention.

FIG. 2 is a perspective view showing the entire plant cultivation raft according to the present invention.

FIG. 3 is a top view of the plant cultivation raft according to the present invention.

FIG. 4 is a bottom view of the plant cultivation raft according to the present invention.

FIG. 5 is a sectional view of the raft structure according to the present invention, taken along the line AA in FIG. 4;

FIG. 6 is a sectional view taken along the line BB of FIG. 4, showing the raft structure according to the present invention.

FIG. 7 is a top view showing a connection structure of the plant cultivation raft according to the present invention.

FIG. 8 is a partially enlarged side view showing a connection state of the plant cultivation rafts connected by the connection structure.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... LPG cylinder A Upper port B ... Lower port 11 ... Pipe 12 ... Joint 13 ... Internal pipe 15 ... Internal pipe 100 ... Raft structure 110 ... Passage part 120 ... Plant growing box 150 ... Connection ring metal fitting 151 ... Connection rod

Claims (5)

[Claims] 1. A plant cultivation box for plant cultivation mounted on a buoyant raft structure, and a plant cultivation raft for vegetating plants in the plant cultivation box is mounted on the raft structure and filled with air. A plant cultivation raft comprising: a finished LPG cylinder; and a plant cultivation box attached to a raft structure provided with buoyancy by the LPG cylinder and provided with a plant cultivation floor. 2. The plant cultivation raft according to claim 1, wherein water is introduced into the used LPG cylinder, and the buoyancy of the LPG cylinder is adjusted by the amount of the water. 3. A plurality of used LPG cylinders having a first port for introducing or discharging water therein,
The plant cultivation raft according to claim 2, further comprising a second port for pumping compressed air into the G cylinder and discharging water in the LPG cylinder from the first port. 4. The first port is below the LPG cylinder,
The plant cultivation raft according to claim 3, wherein the second port is connected to an upper side of the LPG cylinder. 5. The raft structure according to claim 1, further comprising a connecting means connected to another raft structure at an end thereof.
A plant cultivation raft according to any one of the above.