JPH04185807A - Intake device for surface water in river mouth - Google Patents

Abstract

PURPOSE:To permit surface water to be taken economically by a method in which a water-stop wall higher by a given dimension than the level of river water is farmed on a place other than an intake port from river, and dead water and stay water layers are provided in an intake tank below an intake board to prevent fluidization and also to direct only fresh water on the surface layer. CONSTITUTION:An intake tank 10 is provided connectedly to river and an expandible intake pipe 2 is provided in the tank 10. A funnel-shaped intake board 3 is attached to the upper end of the pipe 2 and a float 4 is provided at a given interval from the board 3. A water-stop wall 6 higher by a given dimension than the level of river water is formed on a place other than the intake port from river. A fan-shaped tapered portion opened toward river is formed in the intake port from river of the wall 6 in order to reduce the flow rate of incoming water and also to prevent the disturbance of the laminar flow of fresh water on the surface layer. Dead water and stay water layers are provided in the tank 10 to prevent the occurrence of fluidization and to direct only fresh water on the surface layer. The surface water can thus be simply and economically taken.

Description

[Detailed description of the invention] [Industrial application field] The invention is not applicable to areas near the mouth of a river (low-water embankment in the tidal area of the river mouth)
Relating to a surface water intake device installed in In other words, near the mouth of a river, the water level fluctuates due to the tide level f, and at high tide, seawater flows up the river, and the freshwater and seawater from upstream have different specific gravity depending on the salinity concentration, and the freshwater covers the surface layer.
This surface water, which becomes "salt water," is freshwater and has a low concentration of chlorine ions, and can be used for agricultural purposes, river purification water, lightning extinguishing water, snow ditch water, etc. Therefore, a device for taking in this surface water is inventive. be.

[Conventional technology]

There is a method of desalinating the surface water of the tidal water area and taking it in by using a tidal weir, but this requires a very expensive investment depending on the width of the river and is not desirable, so a water intake tower and multi-stage gates are installed. Artificial operations were used to take surface water and channel it into the levee using sluice pipes.

[The problem that the invention aims to solve] Conventional water intake devices for surface water in tidal waters are undesirable because they require a large amount of cost and manpower. A suitable product C could not be obtained.

Non-invention is a love story invented in view of this problem,
The purpose of the present invention is to economically obtain a surface water intake device for tidal waters that has a simple configuration, is easy to handle, and has high durability.

[Ninth means to solve all problems]

In order to achieve the above purpose, f
ζ, a funnel-shaped water intake plate (3
) is installed, and a float (4) is installed at the required interval from the water intake board (3) to form a floating water means fi.
A water intake basin (a1, fζ) communicating with the river is provided, and the outer diameter of the water intake plate (3) is larger than the outer diameter of the float (4), and a float is placed on the periphery of the water intake plate (3). (4
) is the required distance from the outer periphery of the river, except for the water intake (5) from the river! A configuration in which a water stop wall (6) with a required height higher than the water level is fully installed, dead water and an aquifer are created in the intake tank below the water intake panel (3) to prevent flow, and only fresh water from the surface layer is introduced. This is O.

A circular screen (7) is placed between the water cutoff wall (6) and the float f4) so as to surround the float (4).
Install a pipe to prevent solids from entering.

Furthermore, as shown in FIG. 1, the water stop 11 (6) is provided with a water intake taper part (8) that opens in a fan shape facing the river at the water intake port (5) from the river. By suppressing the flow velocity of the inflowing water at the water intake (5), the laminar flow of freshwater at the surface layer is prevented from collapsing.

Practically speaking, the above-mentioned increase in water is measured as shown in diagram K1.

[For production]

A surface water intake device installed near an estuary configured as described above, comprising floating water intake means (1) configured as described above.
・A water intake tank (installed at 11 yen) connected to the river, and a water intake tank (3
), a water stop wall (6) with a height higher than the tX water level of the river is installed around the periphery of the water intake from the river (5), and the water is placed inside the water intake tank α■ below the water intake plate (3). Dead water, aquifer [creates] to prevent the flow of water, and only directs fresh water from the surface layer. A circular screen (7) is installed between the water cutoff wall (6) and the float (4) so as to surround the flow (41).
to prevent solid matter from entering.

As shown in Figure 1, the water cutoff wall (6) has a water intake taper part (8) that opens in a fan shape facing the river at the location of the water intake port (5) from the river. Install the water intake part (5)
By suppressing the flow rate of water flowing into the river, the collapse of the laminar flow of fresh water at the surface layer is prevented.Furthermore, there is a substantially straight line at the boundary between the water intake taper part (8) and the river. Attach a screen (9) to prevent solid matter from entering.

〔Example〕

As shown in Figure 1, the direction of water conduction (arrow α3) to the water intake board (3) is approximately perpendicular to the direction of river flow (arrow U).
In principle, the device of the present invention is installed in a water intake frame with a U-shaped cross section that opens into a river as shown in the figure.

As shown in Figure 1, the water stop wall (6) has a semicircular portion (1
3, and a parallel part a of the required size, which is connected to the semicircular part a3 and is provided at an interval of the same size as the outer diameter of the semicircular part a3,
0 (151 is a column, αe
is a connecting fitting for locking the circular screen (7) to the float (4), and the frame is the horizontal plate part of the water intake plate (3).

〔effect〕

As mentioned above, the invention was able to economically achieve a truly excellent surface water intake device installed near the mouth of a river, and it was truly practical, easy to handle, and highly durable. It has great features.

[Brief explanation of drawings]

The drawings show an embodiment of the surface main water system installed near the mouth of a river according to the present invention, and FIG. 1 is a plan view thereof, and FIG. 2 is a sectional view thereof. (11 is the floating water intake means (2) is the water intake pipe (3) is the water intake board (4) is the float (5) is the water intake part (67 is the water stop wall (force is the circular screen (8) is the water intake taper Part (9) is the screen α [is the water intake tank αυ is the arrow indicating the flow direction of the river α is the direction of water flow αJ is the semicircular part [+4> is the parallel part O3 is the support column σF5 is the connecting metal fitting 0 old 1 horizontal Board part (I thirst is the old river A; cover board (G) is the water intake frame

Claims (3)

[Claims] (1) A funnel-shaped water intake board is installed at the upper end of the expandable water intake pipe,
A surface water intake device that uses a floating water intake means consisting of a float attached at a required interval from the water intake board, the water intake board having a portion on the periphery of the water intake board other than the water intake from the river that is higher than the water level of the river. Surface water intake device installed near the estuary, characterized by having a high cut-off wall installed. (2) The vicinity of an estuary according to claim 1, characterized in that a circular screen (7) is installed between the waterstop (6) and the float (4) so as to surround the float (4). Surface water intake device installed in (3) The water stop wall (6) is the water intake part (5) from the river.
A surface water intake device (4) installed near an estuary, characterized in that a water intake taper part (8) that opens in a fan shape facing the river is provided at the location (4). The surface water intake device installed near an estuary according to claim 3, characterized in that a substantially linear screen (9) is attached to the boundary with the river.