JPS5949964B2 - Method for preventing water noise, bubbles, air entrainment, etc. at drop sections - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for preventing the occurrence of water noise, bubbles, air entrainment, etc. in a drop section of a river or waterway.

As a method of reducing the energy of water flow in rivers, waterways, etc., a drop section is generally adopted in which a step is provided between the upstream and downstream sides.

However, a sound is generated when the head falls from upstream to downstream, and this falling sound is louder the larger the amount of water and the larger the difference in height between the upstream and downstream (and the louder it is near residential areas). It can be quite noisy in urban areas.

Furthermore, if there is a drop, the synthetic detergent contained in the river water will foam and spread on the river surface, which is not only aesthetically undesirable, but also has the problem of being blown away and scattered all around when strong winds blow.

Various studies are currently being carried out to solve these problems, but no solution has yet been developed.

The present invention was developed to solve the above-mentioned problems under these current circumstances, and will be described in detail below based on illustrated embodiments.

In Figure 1, 1 is a drop formed in a river, waterway, etc.
2 is upstream, 3 is downstream, and 4 is sewage that falls one step lower downstream from upstream.

In the present invention, the falling water 4 is shielded by bringing a shielding body into contact with the water surface of the falling water 4.

In the case shown in FIGS. 1 and 2, an upper shielding body 6 is brought into contact with an upper water surface 5 of falling water 4 to shield the water surface 5.

What is shown in FIG. 3 is a case where the upstream river width is narrower than the downstream river width, and in this case, an upper shield 6 is placed on one side of the water surface 5 of the falling water 4.
In addition to contacting the water surfaces 11.12 on both sides of the falling water 4, side shields 9.10 are protruded in front of both walls 7.8 of the upstream river, and are brought into contact with the water surfaces 11.12 on both sides of the falling water 4. It is also designed to shield the area.

What is shown in FIG. 4 is a case where the falling water 4 falls in a parabolic manner because the level difference between the upstream 2 and downstream 3 is vertical. In this case, the upper shield 6 and the side shields 9 and 10 are A back surface shielding body 14 is brought into contact with a back surface 13 of falling water 4 to shield the water surface 13 as well.

In any of the cases shown in FIGS. 1 to 4, the upper shield 6 is attached to the side wall of a river, waterway, etc., or to a support erected thereon by strings, springs, hinges, etc. 15.
It can be freely rotated in the b direction.

As a result, when the flow rate of the falling water 4 fluctuates, the upper shield 6 remains in contact with the water surface according to the flow rate fluctuation, and moves as shown by the arrow a.
It is made to rotate (elevate and lower) in the -b direction.

As an example of a method for attaching the upper shield 6, the one shown in FIG.
When the flow rate of falling water 4 increases or decreases, the upper shield 5 moves in parallel.

Upper shield 6, side shields 9, 10, rear shield 14
is the lower end 17 of each of FIGS. 1 to 5.
is lower than the water level 18 downstream 3 so that it penetrates into the water downstream.

The side shields 9, 10 and rear shield 14 shown in FIGS. 3 and 4 may be fixed.

The various shielding bodies 6.9.10.14 should be somewhat deformable, so they may be made of rubber, plastic, etc. into a plate or sheet shape, and their thickness, softness, shape,
The structure etc. may be selected based on the width, water volume, head, etc. of the river to be used.

As described above, the present invention provides an upper shield 6 on the water surface of the falling water 4.
, the side shields 9 and 10, and the back shield are all or partially in contact to shield the falling water 4 (4), so the configuration is extremely simple, so it can be used in any river or waterway. It can also be easily put into practical use.

Moreover, since the lower end 17 of each shield 6.9.10.14 is lower than the water level 18 of the downstream 3 so that it penetrates into the downstream water, the noise caused by the falling water 4 can be reliably prevented. Can be done.

In particular, since the upper shielding body 6 is moved up and down while remaining in contact with the water surface according to the change in the flow rate of the falling water 4, the water surface can be reliably shielded by the upper shielding body 5 regardless of the change in the flow rate.

Further, according to the present invention, since air does not enter the part where the falling water 4 falls, it is also possible to prevent the synthetic detergent dissolved in the water from foaming.

[Brief explanation of the drawing]

FIG. 1 is a side explanatory view showing an example of the present invention, and FIG. 2 is a side view showing an example of the present invention.
FIG. 3 is an explanatory plan view showing the other side of the present invention, and FIGS. 4 and 5 are side explanatory views showing different examples of the present invention. 1... Head part, 4... Falling water, 5...
...Upper water surface, 6...Upper shield, 9.1
0... Side force shield, 11.12... Side water surface, 13... Back water surface, 14... Back shield, 17... ...lower end of each shield, 18.
...downstream water level.

Claims (1)

[Claims] 1. Place the shield in contact with all or part of the upper water surface, both side water surfaces, and back water surface of the falling water at the drop part, and make sure that the lower end of the shield is lower than the water downstream. The water surface is shielded by a shield, and the shield on the upper water surface moves with changes in the water surface to prevent the sound of falling water, bubbles, air entrainment, etc. How to prevent water noise, bubbles, air entrainment, etc.