JPH07229132A - Inflow channel of pumping station - Google Patents

Abstract

PURPOSE:To smooth flow of water in a separation line by forming foreign matter capture recessed part on the bottom of a vortex generating area near the inlet of the separation line to capture sediment or the like taken in the vortex and settled. CONSTITUTION:Water which flows from a main channel 1 into a separation line 2 is turned as shown by the arrow A, and deflected toward the outside in the cross direction of a water intake part 2A. Then, the water is moved toward and introducing part 2B as shown by an arrow B, and flows into a water suction tank 3 to be sucked by a pump P. Subsequently, a vortex C is caused by separation inside the deflected flow shown by an arrow A, and sediment or the like taken in the vortex C is captured by a deep main part 4A of a foreign matter capture recessed part 4. Further the sediment settled from the deflected flow part shown by the arrow A is captured by a shallow groove part 4B, and as the groove 4B is inclined with down grade toward the main part 4A, it flows into the main part 4A. In the case where the sediment is deposited on the main part 4A, a gate 6 is lowered to dam up a water flow, water is drained and the sediment is removed, Thus, a water flow can be always smoothed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an inflow channel of a pumping station in which a water absorption tank having a pump is provided in the inner part of a branch channel formed by branching from a main channel of a river or the like.

[0002]

2. Description of the Related Art Conventionally, as an inflow channel of a pumping station in which a water absorption tank in which a pump is installed is provided in the inner part of a branch channel formed by branching from a main channel of a river or the like, one shown in FIG. Are known. That is, with respect to the main waterway 1 such as a river, a predetermined bending angle θ (for example, θ = 90) in the projection plane.
2) is branched at a water intake portion 2A and an inlet portion 2B formed in parallel to the main water channel 1 in parallel with the water inlet portion 2A. It has a structure in which a water absorption tank 3 in which the pumps P, P of the table are installed is provided.

In the inflow channel of this type of pumping station, the water flowing from the main channel 1 into the branch channel 2 changes its direction as shown by an arrow A and is deflected toward the outside in the width direction of the intake section 2A. As shown by the arrow B, it moves toward the introduction section 2B, flows down from the introduction section 2B into the water absorption tank 3, and is absorbed by the pumps P, P.

On the other hand, a vortex C due to separation is generated in the vicinity of the inlet of the diversion channel 2, that is, inside the uneven flow indicated by the arrow A of the water intake section 2A, and foreign matters such as sediment and sludge that are taken into the vortex C and settle down with time. Accumulated on the bottom surface of the water intake section 2A by
This becomes a factor that causes an inconvenience that hinders the flow of water in the branch channel 2.

[0005]

A vortex is generated in the vicinity of the inlet of the shunt, and foreign matter such as sediment and sludge that is trapped by the vortex is deposited on the bottom of the shunt over time.
This is a factor that causes an inconvenience that hinders the flow of water in the branch channel.

[0006]

According to the present invention, in an inflow water channel of a pumping station in which a water absorption tank in which a pump is installed is provided in the inner part of a branch channel formed by branching from a main water channel, A concave part for capturing foreign matter is formed at least at the bottom near the inlet, which corresponds to the vortex flow generation area.By trapping foreign matter such as sediment and sludge captured by the vortex, the foreign matter is diverted. The objective of avoiding the inconvenience of depositing on the bottom of the channel and obstructing the flow of water in the shunt was achieved.

[0007]

According to the present invention, in a flow taken from a main waterway such as a river, foreign matter such as sediment and sludge taken into the vortex generated near the inlet of the branch channel sinks to catch foreign matter. Captured in the recess. Therefore, the foreign matter is not deposited on the bottom surface of the shunt and the flow of water in the shunt is not hindered. In addition, when the foreign matter captured in the foreign matter capturing recess is accumulated over time, the foreign matter may be removed by blocking the flow of water at the inlet of the branch channel.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a plan view showing an embodiment of the present invention, and FIG. 2 is a sectional view taken along line XX of FIG. It should be noted that the same or corresponding parts as those in the conventional example of FIG. In FIG. 1, the inflow water channel has a predetermined bending angle θ (for example, θ = 90) with respect to the main water channel 1 such as a river in the projection plane.
(2) is bent, and a branch passage 2 having an inlet 2B formed parallel to the main water channel 1 is formed in a branching manner, and a plurality of inlets 2A are formed in the inner portion of the inlet 2B. It has a structure in which a water absorption tank 3 in which the pumps P, P of the table are installed is provided.

On the other hand, the vortex flow C near the inlet of the branch flow channel 2
A concave portion 4 for catching a foreign matter is formed on the bottom portion corresponding to the area in which the foreign matter occurs. The foreign matter trapping recess 4 is formed in the bottom of the deep main portion 4A, which is formed directly below the region where the vortex C is generated, and communicates laterally with the main portion 4A, and is gradually lowered toward the main portion 4A. It has a shallow groove portion 4B that inclines in a gradient. In addition, corner cuts 5 and 5 are formed in a concave shape on both sides of the inlet of the branch flow channel 2.

With such a construction, the water flowing from the main water channel 1 into the branch channel 2 changes its direction as shown by arrow A, and is deflected toward the outer side in the width direction of the water intake section 2A, and then the arrow B. Move toward the introduction section 2B as shown in
Is flowed down to the water absorption tank 3 and is absorbed by the pumps P, P. On the other hand, a vortex flow C due to separation inside the drift shown by arrow A
Occurs. The foreign matter such as earth and sand and sludge taken in by the vortex C sinks and is captured by the deep main portion 4A of the concave portion 4 for capturing foreign matter. Further, the foreign matter settled from the drift portion indicated by the arrow A is captured by the shallow groove portion 4B. The trapped foreign matter naturally moves toward the deep main portion 4A and is captured by flowing into the deep main portion 4A because the shallow groove portion 4B is gradually inclined toward the main portion 4A. It will be. Therefore, the flow of water in the diversion channel 2 is not hindered by the accumulation of foreign matter. Further, when the foreign matter captured in the concave portion 4 for capturing the foreign matter is accumulated over time, as shown by a phantom line in FIG.
5, the gate 6 is lowered, the flow of water is stopped at the inlet of the branch channel 2, the water in the branch channel 2 is drained by the pumps P, P, and then the accumulated foreign matter is removed.

FIG. 3 is a cross-sectional view showing a modified example of the concave portion 4 for capturing foreign matter. That is, the concave portion 4 for capturing foreign matter has a deep main portion 4A formed immediately below the region where the vortex C is generated,
A structure may be provided that includes a groove portion 4B that communicates laterally with the main portion 4A and is horizontally formed on the bottom portion. Further, as shown in FIG. 4, even if the concave portion 4 for trapping foreign matter is constituted only by the deep main portion 4A formed immediately below the region where the vortex C is generated, the same action and effect as the above-mentioned embodiment can be obtained. be able to.

In the above embodiment, the bending angle θ in the projection plane with respect to the main water channel 1 is set to 90 °, and the water intake section 2A is set.
Although the inflow water channel of the pump station that has been branched is described, the bending angle θ of the water intake section 2A with respect to the main water channel 1 is 90
The angle is not limited to 30 °, but is arbitrary within the range of 30 ° to 90 °.

[0013]

As described above, according to the present invention, in a flow taken from a main waterway such as a river, foreign matter such as sediment and sludge taken in by the vortex generated near the inlet of the branch channel is settled. Then, it is captured in the concave portion for capturing the foreign matter.
Therefore, the foreign matter is not deposited on the bottom surface of the shunt and the flow of water in the shunt is not hindered. In addition, when the foreign matter captured in the foreign matter capturing recess is accumulated over time, the foreign matter may be removed by blocking the flow of water at the inlet of the branch channel.

[Brief description of drawings]

FIG. 1 is a plan view showing an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along line X1-X of FIG.

FIG. 3 is an enlarged cross-sectional view showing a modified example of a recess for capturing foreign matter.

FIG. 4 is an enlarged cross-sectional view showing another modified example of a concave portion for capturing a foreign matter.

FIG. 5 is a plan view of a conventional example.

[Explanation of symbols]

 1 Main Water Channel 2 Divided Flow Channel 3 Water Absorption Tank 4 Recess C for Catching Foreign Material C Eddy Current P Pump

Claims (1)

[Claims] 1. An inflow channel of a pumping station in which a water absorption tank in which a pump is installed is provided in a deep part of a branch channel formed by branching from a main channel, at least in a swirl flow generation region near an inlet of the branch channel. An inflow channel of a pumping station, characterized in that a recess for catching foreign matter is formed on the corresponding bottom.