JP2524200B2 - Method for forming installation holes and installation holes for shallow water pumping equipment - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a method for forming a hole for a shallow water pumping device for the purpose of clearing water in a shallow water area such as a lake, a river, or a culture pond.

(Prior Art) Conventionally, an intermittent air pumping device has been used to improve the water drainage effect in the drainage of lakes, rivers, etc. (JP-A-62-233500).
No.), and also for freshwater in shallow water areas such as park ponds and golf course ponds, the applicant has previously proposed that the pumping device is effective (Japanese Patent Laid-Open No. 62-73403). (Japanese Patent Publication No. 5-73479).

(Problems to be solved by the invention) Originally, the intermittent air pumping device intermittently sends a predetermined amount of air into the pumping cylinder, and causes an ascending water flow in the pumping cylinder by the air mass floating in the pumping cylinder. The basic technique is to clean the water.

In order for the basic technique to work effectively, a predetermined amount of air supplied into the pumping cylinder must become an almost bullet-shaped air mass. However, in order to become such an air mass,
It has been found that it is necessary to maintain a predetermined relationship between the pipe length and the diameter of the pumping pipe.

However, in open water areas with a depth of around 3 m or less, a pumping cylinder with a diameter as large as possible is preferable to increase the pumping effect, and when the diameter is large, it is necessary to make the cylinder length long, so the water depth shortage There is a problem that it occurs.

Further, on the water bottom of aquaculture ponds and the like, fine-grained soil or organic matter that is relatively easy to float is deposited, but there is also a problem in that sudden pumping may involve these deposits.

(Means for Solving the Problem) Therefore, the present invention is
The above-mentioned conventional problems were solved by digging a hole in order to install the water pumping device and developing a technique relating to the shape structure of the hole.

That is, the present invention, to the water bottom to install the pumping device, at a depth such that the upper end of the pump is below the surface of the water, the flow velocity is such that at least the hole wall is not collapsed by water absorption into the pump, and We have developed a method for forming holes for shallow water pumping equipment by digging holes (for example, mortar-shaped holes) that have openings that prevent the water absorption rate from changing rapidly. Further, the depth of the hole of the present invention, the upper end of the pumping cylinder is lower than the minimum water level, 0.5m or less from the average water level, if necessary, a method of forming an installation hole for a shallow water pumping device with a covering on the hole wall Is.

In addition, the hole wall on which the water pumping device of the present invention is installed may have both the bottom wall and the sloped wall covered with a covering material. Further, the slope of the side wall of the hole in the above is an inclination angle whose upper limit is the angle of repose of the soil at the bottom of the water. In the above description, the cross-sectional area of the gap between the outer periphery of the lower end of the suction cylinder and the hole wall is at least three times the area of the cross-sectional area of the blow cylinder.

The covering material of the invention is a perforated or non-perforated metal plate or a synthetic resin plate. Also, the inclination angle of the slope is usually
The angle is 20 to 50 degrees, but the angle is not limited in principle.

The top of the pump must be below the surface of the water. In addition, the water depth at the upper end of the pumping cylinder is recognized to be in the normal range of use of 0.5 m to 1 m, but this is not necessarily restricted. However, if the water depth at the upper end of the pumping cylinder is about 0.5 m, the water near the water surface can be sufficiently entrained when the pumping water is ejected from the upper end of the pumping cylinder, and the initial purpose can be achieved. Further, if the water depth is 1 m or more, the depth of the hole will inevitably become large and various difficulties will occur, so it will be 0.5 to 1 m in practice.

The cover plate does not necessarily have to contact the wall of the hole, and the solid matter may drop downward from the hole of the cover plate at a predetermined interval (for example, about 10 cm).

The average water level in the above means the average value of the water level during the usage period of the pump.

(Operation) As described above, according to the present invention, the water depth is 3 m or less.
It can pump water efficiently even in shallow water such as about 1 m. Further, by covering the bottom surface, it is possible to prevent the possibility that fine particles or the like on the bottom of the water will be lifted together with the pumping.

(Embodiment 1) Next, an embodiment of the present invention will be described with reference to FIGS.

A hole 2 having a side of 2 m and a depth of 1 m is dug in the water bottom 1, a slope 4 is provided from the outer edge of the hole bottom to the water bottom 1 at an angle of about 30 degrees, and a thin iron plate 5 is attached to the hole bottom 3. Then, if necessary, they are fixed by the stopper 6. The slope 4 is covered with a thin iron plate 7.

A pumping device 9 having a suction cylinder 8 with a diameter of 0.3 m is installed in the center of the hole bottom 3. The pumping device 9 includes the suction cylinder 8
An air chamber 18 is formed by loosely fitting an inner cylinder 10, a partition cylinder 11, and an outer cylinder 12 at predetermined outer spaces with a predetermined gap, and four pumping cylinders having a length of 1.5 m are provided above the suction cylinder 8. 13a, 13b, 13c, 13d
The lower part of is connected via a connecting part 14. The four pumping cylinders
A floating chamber 15 is attached to the outside of the upper ends of 13a, 13b, 13c and 13d.

In the above embodiment, when pressurized air is fed through the hose 16 to the inside of the outer cylinder 12 as indicated by the arrow 17, air is successively accumulated into the air chamber 18 from the top plate 19 side, and the air chamber is increased by that amount. Push down the water level. Then, when the water level 20 reaches the communication hole 21, the air in the air chamber is expelled into the suction cylinder 8 at once, creating an air lump and rising as shown by arrow 22, and then the air lump 4
The water pumps 13a, 13b, 13c, 13d of the book are divided and rise. The air mass 32 that rises in the pumping cylinders 13a, 13b, 13c, 13d as shown by the arrow 23 has a substantially bullet shape and is closely fitted to the inner wall of each pumping cylinder, so that each air mass 32 is buoyant. Since a strong suction force is applied to the water in the water absorbing cylinder, the water at the lower end of the water absorbing cylinder is forcibly sucked up as shown by the arrow 24 and pumped. The water that has risen in the pumping cylinders 13a, 13b, 13c, 13d in this way is indicated by the arrow 2
As shown in 5 and 26, the water surface 27 is raised and then spread radially. However, the water sucked into the suction cylinder 8 is
As indicated by arrow 35, since it is inhaled from the bottom of the water through the slope, a large convection is generated centering on the pumping cylinder, and water containing a large amount of oxygen near the surface of the water is caught near the bottom of the water. Rapidly increase the amount of oxygen in the vicinity. If the amount of oxygen near the bottom of the water increases rapidly in this way, aerobic microorganisms on the bottom of the water will propagate and decompose organic substances into gas and inorganic substances, so that the vicinity of the bottom of water can be purified. In the figure
29 is a sinker, 30 is a mud removing plate, and 31 is a marking buoy.

In the above embodiment, the thin iron plates 5 and 7 are provided on the hole bottom 3 and the slope 4, respectively.
However, only the hole bottom 3 may be coated.

Further, the angle of the slope is not limited to the example, and the point is that the soil near the bottom surface does not soar due to the water flow due to the nature of the bottom soil.

(Embodiment 2) In the embodiment shown in FIG. 4, the drawing grooves 28a, 28b, 28c, 28d having substantially the same depth are formed radially from the outer periphery of the hole of the embodiment shown in FIG.
Are provided, and other points are the same as in the first embodiment.
The length of the lead-in grooves 28a, 28b, 28c, 28d is at least several times the length of the bottom of the hole or more.

The lead-in grooves 28a, 28b, 28c, 28d are intended to expand the influence range of the pump as much as possible when the water depth is particularly small (for example, about 2 m), and the cross-sectional shape is not limited. Alternatively, it is possible to select the length of the drawing groove corresponding to the outer shape of the pond or the like to make the lengths unequal.

(Effect of the Invention) According to the present invention, by providing the installation hole for the pumping device at the bottom of the water, it is possible to use the pumping device in a shallow water area and improve the efficiency even in the case of a short cylinder with a large capacity. . Therefore, there are various effects such that the number of pumping equipment installed in the shallow water can be reduced as much as possible.

[Brief description of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention, FIG. 2 is a partially enlarged sectional view of the same, and FIG.
The figure is also a plan view of another embodiment. 1 ... Water bottom, 2 ... Hole, 3 ... Hole bottom, 4 ... Slope, 5 ... Thin iron plate, 7 ... Thin iron plate, 8 ... Suction tube, 9 ... Pumping device, 10 ... Inner tube, 11 ... Partition cylinder 12 …… Outer cylinder 13a, 13b, 13c, 13d …… Pumping cylinder 14 …… Connection part, 18 …… Air chamber 29 …… Sinker

Claims (3)

(57) [Claims] 1. A depth to a bottom of a pump where a pumping device is to be installed, such that an upper end of the pump is below the surface of the water, and a flow velocity is such that at least a hole wall does not collapse due to absorption of water into the pump. A method for forming an installation hole for a shallow water pumping device, characterized by digging a hole having a wide mouth, a narrow bottom, and a mortar-shaped spread so that the speed does not change suddenly. 2. A depth of water such that the upper end of the pump is below the surface of the water to which the pumping device is to be installed, and the flow velocity is such that at least the hole wall does not collapse due to the absorption of water into the pump. A method of forming a hole for shallow water pumping equipment, characterized by digging a hole with a spread so that the speed does not change abruptly and making the slope of the hole side wall an inclination angle with the angle of repose of the soil at the bottom as the upper limit. . 3. A water flow having a depth such that the upper end of the water pump is below the surface of the water to which a water pump is to be installed, and the hole wall does not collapse at least due to water absorption into the water pump. A method for forming an installation hole for a shallow water pumping device, which comprises digging a hole having a spread so that the speed does not change abruptly, and arranging a plurality of grooves radially in the hole.