JPS62111012A - Siphon dam - Google Patents

Abstract

PURPOSE:To form a siphon path of a simple structure in which outer shells are set at an interval on the upper periphery of a dam, the lower ends of the front and back sides of the outer shells are positioned under water surface, and an air supply and discharging device is provided for the outer shells. CONSTITUTION:A dam 1 is provided at right angle to river or water channel, and outer shells 3, 4, and 5 are set at an interval on the upper periphery of the dam 1. The lower ends of the front and back sides 3 and 5 of the outer shell are positioned under water surface, and a siphon path (a) is formed on the periphery of the dam 1. Air supply and discharge devices 8-12 for the path (a) are attached to the outer shells 4. In allowing water to overflow, a valve 12 is opened to discharge air from an exhaust pipe 11, thereby producing a siphon effect. Before the overflow is stopped, a valve 9 is opened and air is supplied from an air supply tube 8 to the path (a) to stop the siphon effect.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is characterized in that a dam is provided in a river or other various waterways, and a siphon flow path that can adjust the flow rate is formed on the outer periphery of the upper part of the dam. It is related to siphon salt having.

(Prior art) Securing the water level and adjusting the flow rate in rivers, etc. is usually done by gate-type water gates.The gate-type water gate is installed in a waterway so that it can move up and down, and the water gate is moved up and down using a lifting device. The structure is such that the water overflows from the top of the sluice gate, and the overflow amount is adjusted to ensure the water level and adjust the flow rate.

In addition, as a special example, a structure has been developed in which a large number of siphon pipes are installed between a river and a waterway, and the amount of released water is adjusted by adjusting the operation of the siphon pipes (for example, Japanese Patent Publication No. 56-10405 issue).

(Problems with the prior art) The conventional gate-type water gate requires a vertical movement mechanism and a sealing mechanism for the water gate itself, and also requires a large lifting device, making the device complicated and significantly increasing costs. In addition, there are problems such as maintenance, inspection, repair, etc. requiring time and effort.

In addition, in the conventional water discharging facility using siphon pipes, there is a limit to the flow rate of the siphon pipe itself, and the flow rate adjustment range is itself limited, and a large number of siphon pipes are required.
There are problems in that the operation of each siphon tube, that is, the flow rate adjustment device, is complicated, large, and costly.

(Objective of the Invention, Means for Solving Problems) The present invention was developed in order to solve the above-mentioned problems. The lower edges of the front and rear surfaces of the outer shell are placed below the water surface to form a siphon flow path on the upper outer periphery of the dam, and an intake and exhaust device for increasing and decreasing air pressure is connected to the upper part of the siphon flow path. The structure is characterized by the structure of the pot, which has a spaced outer shell on the upper outer circumference of the dam, and the siphon channel is formed directly on the upper outer periphery of the dam, which greatly simplifies the structure and reduces costs. At the same time, the durability has been improved, the flow rate adjustment range has been greatly expanded, and the air pressure inside the siphon channel can be increased or decreased using the air intake and exhaust device connected to the top of the siphon flow path, making it easier to adjust the flow rate and maintain it. It is an object of the present invention to provide a siphon salt that easily improves water level and flow rate adjustment performance and solves the above-mentioned problems.

(Embodiment) Figures 1 and 2 show an embodiment of the present invention. In the figure, (1) is a dam installed in a river or waterway and oriented perpendicular to the water flow. An outer shell (3, 4, 5) is attached to the upper outer circumference of the dam (1) to cover the front, upper and rear surfaces thereof.
are arranged at desired intervals, and the outer shells (3,
The front (3) lower edge and the rear (5) lower edge of 4 and 5) are respectively placed below the water surface, and the siphon channel (a) is provided directly on the upper outer circumferential surface of the dam (1), Furthermore, a plurality of partition walls (7) are fixedly installed on the upper outer periphery of the dam (1) at intervals in the length direction to form a wall on the front, top, rear, and entire length of the upper periphery of the dam (1). The siphon channel (al) is divided into several sections (see especially Figure 2), and a protrusion below the water surface (3) is provided at the lower edge of the front surface (3) of the outer shell (3°4.5 ) (6), and the protrusion (
6) reduces the flow velocity just before the front surface of the outer shell (3) to create a stagnation area, thereby buffering the front surface of the outer shell (3) from colliding with floating objects flowing from upstream.

Further, an intake valve (9) is provided above the siphon flow path (a).
) and an exhaust branch pipe OO having an exhaust valve (13) are connected, and as shown in FIG. (a), each exhaust branch pipe (1B is connected to the exhaust manifold pipe qυ), and the exhaust system (13) is connected to the exhaust system ff (8...13). (2) in the figure is the riverbed.

(Function) The embodiment of the present invention has the above-described configuration, and when the intake valve (9) is opened, the siphon flow path (
Since air is supplied to the upper part of a) and the pressure becomes atmospheric, the siphon effect disappears and the flow is stopped by the dam (1) until the water level on the upstream side reaches the height of the dam (1). , the water level on the upstream side is secured.

When the intake valve (9) is closed and the air in the upper part of the siphon flow path (a) is sucked and exhausted by the exhaust device (13) through the exhaust manifold pipe (11), the exhaust valve (lz) and the exhaust branch pipe 01,
The siphon channel (a) is filled with water, causing a siphon effect, and the water flows from upstream to downstream due to the water level difference.

By leaving an appropriate amount of air in the upper part of the siphon channel (al), the siphon channel (a)
An open water surface (1)) is formed in the upper part of the dam, and the cross-sectional area of the channel above the dam (1) becomes narrower, reducing the flow rate.
The flow rate can be continuously adjusted by controlling the amount of remaining air, that is, the air pressure, in the upper part of the siphon flow path (a) to increase or decrease using the suction/exhaust device. The above control can be performed by manually or automatically operating an exhaust system (1 tank) installed on the ground on the side of a river or waterway,
) By directly forming the siphon flow path (a) on the upper outer circumferential surface of the flow f, the maximum flow rate is greatly increased and the flow f adjustment range is significantly expanded. Adjustment is free and easy.

When the siphon flow path (a) is divided into a plurality of sections by means of a partition wall (force), each section of the siphon flow path (a) can be adjusted to flow 1 as shown in Qij, and the flow rate adjustment performance is further improved.

By providing a protrusion (6) below the water surface on the lower edge of the front surface (3) of the outer shell (3, 4, 5), the flow immediately in front of the outer shell front surface (3) is weakened and a stagnation area is formed. This prevents floating objects from upstream from colliding strongly with the front surface of the outer shell (3), eliminating damage and increasing durability.

The upper surface (4) of the outer shell (3, 4, 5) can be used for a bridge, etc.

In the embodiment described above, an example was explained in which a dam was provided over the entire width of a river or waterway, but it is also possible to provide a gate-type sluice in a part of the river or waterway.

(Effects of the Invention) As described above, the present invention provides an outer shell (3, 4, 5) which is provided at intervals on the outer periphery of the upper part of the dam (1) to cover it, and in front of the outer shell,
The lower edges of the rear surfaces (3, 4) are placed below the water surface, and the weir (1
) is formed on the upper outer periphery of the siphon flow path (al), and an intake/exhaust device f1 (8...13) for increasing and decreasing air pressure is connected to the upper part of the siphon flow path (al). , the structure is greatly simplified and costs are reduced, there are no moving parts, which increases durability, and the adjustment range of the maximum flow rate is greatly expanded. By increasing and decreasing the air pressure in the upper part using the installed intake and exhaust device, the flow rate can be adjusted freely and easily, and maintenance such as maintenance, inspection, and repair is also facilitated, and the water level and flow rate adjustment performance is improved. It has been significantly improved.

Although the present invention has been described above with reference to embodiments, it goes without saying that the present invention is not limited to such embodiments, and that various design modifications can be made without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an embodiment of the present invention, and FIG. 2 is a plan view of the entire device. 1: Weir 3.4, 5: Outer shell 8, 9.1
0.11.12.13: Intake/exhaust system a: Siphon flow path Sub-agent Patent attorney 2 people from the same car, other than important documents Figure 1

Claims (1)

[Claims] A siphon flow path is formed on the upper outer periphery of the dam by disposing an outer shell at intervals on the outer periphery of the upper part of the dam, and covering the outer shell with the front and rear lower end edges thereof placed below the water surface. A siphon weir characterized in that an intake and exhaust device for increasing and decreasing air pressure is connected to the upper part of a siphon flow path.