JPS6328166B2 - - Google Patents

Description

[Detailed Description of the Invention] This invention is based on
- Further expanding the installation method of river surface water intake valve No. 854 and surface water intake valve No. 855 of the Special Public Interest Publication, allowing for simultaneous intake of river surface water and underground water, or switching between the two depending on the situation. This relates to a method of water intake using pumps and siphon pipes.

In general, rivers do not necessarily have an abundant flow rate depending on the basin, soil type, etc., and there are many cases where surface water becomes underground water and there is little surface water depending on the soil quality.
If the soil of the river bed is sandy and gravelly, there will naturally be an abundance of underground water, and the river's natural purifying action will provide clean underground water. Underground water is taken in by burying perforated water collection pipes in the river bed, and usually maintains a water head difference.

Regarding the amount of underground water taken in, a large amount of underground water can be taken in by suppressing the inflow velocity at the openings of the porous underground water collection pipe to 3 cm/sec or less and using the capillary action of the sand layer to allow only water to flow down without causing fluctuations in the sand layer. In order to take in water, it is necessary to increase the diameter and length of the buried pipe, which increases construction costs. In addition, there are cases where the amount of underground water is small, and depending on the amount of water used and how the water is used, it may be necessary to take water from river surface water and underground water at the same time or by switching between them.

This invention deals with such cases.
A headrace channel is installed parallel to the bank at the center of the river flow, intake wells are constructed at the required locations, and piping from the surface water intake valve and a perforated underground water collection pipe for underground water intake are introduced into these wells. Each pipe is equipped with a water flow control valve, and a pump room is constructed within the river bank, and a pump well is installed at the bottom to install a submersible pump or pump suction side piping, and this pump well and the above water intake well are connected. In between, an inlet pipe that penetrates the seawall is buried at an upward slope toward the pump well side, and a siphon pipe is attached to the end of this water conduit pipe on the pump well side. This is a construction method that allows water intake to be carried out using both surface water and subsurface water, or by switching between them.

An embodiment of the present invention will be described below based on the drawings. A water conduit 2 is provided in the center of a river flow parallel to a seawall 1, an intake well 3 is constructed at a required location, and a surface water intake valve 4 is connected to the water conduit 2. pipes 5 and porous water collection buried pipes 6 for underground water intake, water flow control valves 7 and 8 are installed in each pipe 5 and 6, respectively, and a pump room 9 is constructed within the river bank. A pump well 9' in which a submersible pump or pump suction side piping 10 is installed is provided at the bottom, and the pump well 9' and the water intake well 3 are connected to each other.
A water conduit 11 penetrating the seawall 1 is buried at an upward slope toward the pump well 9' side between the water conduit 11 and a siphon pipe 12 is attached to the end of the water conduit 11 on the side of the pump well 9'. be. In the drawing, 13 is a bed protection work, 14 is a water pipe, and 15 is a discharge water tank.

Next, to explain the details and operation of the structure of the embodiment of the present invention, the water conduit 2 is a three-sided concrete channel that creates a water line in the river, and a surface water intake valve 4 that protrudes into this flow is installed. , there is an intake well 3 near here.
Construct a pipe 5 from the surface water intake valve 4 to the intake well 3.
, and a water flow control valve 7 is attached to the end of the pipe.

On the other hand, a porous underground water collection pipe 6 is connected to the water intake well 3, and a water flow control valve 8 is attached to the end of the pipe. In order to protect these structures and seawall 1, bed protection work 13
to be poured. The water pipe 11 is a concrete pipe lined with concrete. The pump well 9' is made airtight, and a submersible pump or pump suction side piping 10 is installed inside.

In the device according to this method, when the submersible water pump 10 or the land pump is operated, water from the water intake well 3 is guided through the water conduit pipe 11 and into the pump well 9' by the siphon pipe 12 due to the suction performance of the impeller. This water is then sent through a water pipe 14 to a discharge water tank 15 that communicates with an outside water distribution channel, and is taken in therefrom.

By adjusting the water flow control valve 7 or 8 depending on the inflow of surface water or underground water from the river, it is possible to simultaneously take in water or to take in water individually by switching between them.

As described above, according to the present invention, it is possible to intake river surface water and underground water in combination or alternately, so it is possible to intake and adjust surface water or underground water depending on the purpose of water use, and it is also possible to secure the amount of water intake. In addition, by making the pump well airtight and conveying water using a siphon pipe, the suction capacity of the pump impeller can be utilized to increase the amount of water intake compared to the natural slope water conveyance system. Compared to the conventional method, the diameter of the water pipe can be made larger, so it is economical with less pipe loss, and since the water pipe is buried on an upward slope toward the pump well side, there is less intrusion of earth and sand, so there is no failure and easy management. This is a water intake construction method that has many effects, including:

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention; FIG. 1 is a front view showing a cross section, FIG. 2 is a plan view, and FIG. 3 is a sectional view taken along line AA' in FIG. 1... Seawall, 2... Headrace, 3... Intake well, 4... Surface water intake valve, 5... Piping, 6... Porous water collection buried pipe, 7, 8
...Water flow control valve, 9...Pump room, 9'...Pump well,
10... Submersible pump or pump suction side piping, 1
1... Water conveyance pipe, 12... Siphon pipe, 13... Bed protection work, 14... Water pipe, 15... Discharge water tank.

Claims (1)

[Claims] 1. Install a headrace channel parallel to the bank at the center of the river flow,
Water intake wells are constructed at the required locations, and piping from the surface water intake valve and porous underground water collection pipes for underground water intake are introduced into these wells, and a water flow control valve is installed in each pipe.
In addition, a pump room is constructed within the river bank, and a pump well is installed at the bottom to install a submersible pump or pump suction side piping, and a water conveyance pipe that penetrates the bank is installed between the pump well and the intake well. The pipe is buried at an upward slope toward the well side, and a siphon pipe is attached to the pump well side pipe end of the water conveyance pipe, so that surface water and underground water can be taken from the intake well in combination or alternately by the pump and the siphon pipe. A water intake method that uses both surface water and underground water.