JPH03199539A - Rainwater storing pond - Google Patents

Abstract

PURPOSE:To reduce the energy cost by pouring the water in a drainage region by a water pouring pump into a water storing pipe in single or multiple coil form whose both edges are connected to a sewage processing yard and which is formed into loop form and laid in a drainage region on the downstream side. CONSTITUTION:A rainwater storing pond 10 is formed from a single loop-shaped water storing pipe 11, and laid in a drainage region 12 of sea and a river, and both the edges are connected to a sewage processing yard 15 on the upstream side through connecting pipes 13 and 14. Further, the discharge side of a water pouring pump 17 whose one edge is opened in the region 12 is connected to an inlet side pipe 13, and a drainage pipe 20 is connected to a discharge pipe 14. When a large quantity of dirty water flows into the processing yard 15 in rainfall, the dirty water is allowed to flow into the pipe 11, and stored temporarily. When the dirty water in the pipe 11 is pumped up, the water in the region 12 is introduced into the pipe 11 by the pump 17, and the dirty water in the pipe 11 is pushed into the processing yard 15. Accordingly, the pumping-up energy is reduced, and the energy cost can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to improvement of a rainwater retention pond that temporarily stores wastewater during rainfall.

[Prior Art] A rainwater retention pond is installed for the purpose of temporarily storing rainwater to prevent rainwater from flowing into a sewage treatment plant in excess of its processing capacity during rainfall, and is generally installed underground.

Recently, an oval-shaped structure as shown in FIG. 3 has been proposed as a structure for such a rainwater reservoir. This oval-shaped rainwater reservoir is installed at a depth of about 100 meters underground, and if it is classified by pumping method, it can be classified as a direct injection method (see Figure 3 (a)).
There are three types: , indirect press-fitting method (see Fig. 3(b)), and pump method (see Fig. 3(c)).

The direct injection method is a method in which high-pressure air is directly injected from the upper part of the rainwater reservoir 1 using a compressor 2 installed on the ground, and water is pumped up from the central shaft 3.

The indirect press-in method is a method in which high-pressure air is temporarily stored in a pressure tank 4, and the high-pressure air is pressure-injected into the rainwater reservoir 1 while being decompressed to pump water.

The pump system is a system in which a pump 5 is installed, a vertical hole 6 is provided for pumping water, and a high-lift sand pump 7 is installed at the lowest end and in the middle to pump water.

If the above three methods are expressed in terms of the power cost ratio per 1 m3, the ratio will be 2.5:3.5:1 from the above method.

[Problems to be Solved by the Invention] However, even with the cheapest pump system, the pumping energy is extremely large, resulting in enormous power costs.

In particular, both methods involve high construction costs because they are underground structures.

An object of the present invention is to provide a rainwater reservoir that can reduce construction costs and power costs by utilizing the drainage areas of the sea, rivers, etc.

[Means for Solving the Problems] In order to achieve the above object, the rainwater retention pond according to the present invention includes a single or multiple retention pipe formed in a loop in the discharge area of the sea, river, etc. Both ends of the water retention pipe are connected to a sewage treatment plant, and a water injection pump is connected to the inlet side of the water retention pipe to inject water from the discharge area.

[Function] The rainwater retention pond of the present invention is such that when sewage during rainfall flows into a sewage treatment plant and overflows, the sewage flows into a loop-shaped water retention pipe installed in the downstream discharge area. It flows in and is temporarily stored.

When pumping up sewage in a water retention pipe, if water is injected into the discharge area using a water injection pump connected to the inlet side of the water retention pipe, the amount of water injected can push out the sewage in the water retention pipe and bring it up to the sewage treatment plant. can.

C Embodiment] FIG. 1 is a configuration diagram showing an embodiment of a rainwater reservoir according to the present invention, and FIG. 2 is a view taken along the line A--A in FIG. 1.

In this embodiment, the rainwater retention pond 1o is composed of a water retention pipe 11 formed in a single loop shape, and is laid in a discharge area 12 such as the sea or a river, and both ends thereof are connected via connecting pipes 13 and 14. It is connected to a sewage treatment plant 15 on the upstream side. Further, the discharge side of a water injection pump 17 of a water injection pipe 16 whose one end opens into the discharge area 12 is connected to the inlet side connecting pipe 13 via a valve 18, and a valve 19 is provided on the outlet side connecting pipe 14. A discharge pipe 20 is connected.

Since this embodiment is configured as described above, when a large amount of sewage flows into the sewage treatment plant 15 and overflows during rain, the overflow water is transferred to the discharge area 12 such as the sea or river. The sewage flows into the water retention pipe 11 laid inside and is temporarily stored there. This can prevent water pollution in the sea, rivers, etc.

Next, when pumping up the wastewater that has accumulated in the water retention pipe 11,
The valve 18 is opened, and the water in the discharge area 12 is injected into the water retention pipe 11 from the inlet connecting pipe 13 through the water injection pipe 16 using the water injection pump 17. As a result, the sewage in the water retention pipe 11 is flushed out, so that the sewage can be drawn up to the sewage treatment plant 15 through the outlet connecting pipe 14. In addition, when the water retention pipe 11 is filled with water from the discharge area 12, the discharge pipe 2
0 valve 19 is opened, sewage flows into the water retention pipe 11.
Close one valve at the right time.

As mentioned above, the sewage in the water retention pipe 11 is pumped up by the water injection pump 1.
7, no matter how deep the water retaining pipe 11 is installed, the pumping energy is sufficient to cover the pressure loss and is very small.

In the present invention, the water retaining pipe 11 is formed into a single loop or multiple loops in a circular, rectangular or other shape depending on the amount of water stored and the installation space.

[Effects of the Invention] As described above, according to the present invention, the rainwater retention pond is constituted by a water retention pipe installed in a loop in the discharge area of the sea or river,
By connecting both ends of the pipe to a sewage treatment plant and injecting water from the discharge area into the inlet side of the pipe using a water injection pump, the wastewater inside the pipe can be pumped up, which requires very little pumping energy and reduces power costs. can be much reduced compared to conventional pump systems. Also, since it is installed within the drainage area, construction costs will be much lower.

[Brief explanation of drawings]

Fig. 1 is a configuration diagram showing an embodiment of a rainwater reservoir according to the present invention, Fig. 2 is a view taken along line A-A in Fig. 1, and Figs. 3(a) to 3).
(c) is a diagram showing an example of the configuration of a conventional egg-shaped rainwater reservoir. 10...Rainwater retention pond 11...Water retention pipe 12...Discharge area 13.14...Connecting pipe 15...Sewage treatment plant 1 6...Water injection pipe 7...Water injection pump 0...・Discharge pipe

Claims (1)

[Claims] A single or multiple water retention pipe connected at both ends to a sewage treatment plant, formed into a loop and laid within the downstream discharge area, and connected to the inlet side of the retention pipe so that water from the discharge area can be injected. A rainwater reservoir equipped with a water injection pump.