JPH0242737Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention is a bag-shaped weir for controlling the air pressure of a bag-shaped weir installed for the purpose of taking water from water supply, industrial water, agricultural water, rivers, etc. Regarding supercharging air and overpressure prevention devices.

(Prior Art) As shown in FIG. 3, the conventional weir body 1 is made to stand up by injecting air, and is then made to fall down by discharging the air. An air supply device 4 is used to inject air into the weir body, and an overpressure prevention device is attached to prevent the weir body 1 from bursting due to overpressure. That is, this device has a structure in which the opening of a water seal pipe 5 branched from an air pipe 3 connecting the inside of the weir body 1 and the air supply device 4 is opened into water in a water seal tank 6 filled with water. .

In this conventional device, since the water injection into the water seal tank 6 is performed artificially, firstly, it is complicated and tends to be poorly managed, and secondly, the water level in the water seal tank 6 is constant. The atmospheric pressure that is the standard for control is constant, but on the other hand, the atmospheric pressure generated inside the weir varies depending on the river water level upstream of the weir, so it is more effective when the upstream river water level is high, and the water level The problem was that it was difficult to be effective when the pressure was low, and the overpressure prevention function was also insufficient. Thirdly, since air injection ends in a short time, for the same reason as above, the device does not work at all during air injection, but works only after the water level of the upstream river has risen, so that the amount of air that has been taken into account is There were problems such as the amount being wasted. Fourthly, the water seal tank 6 is placed in the river upstream of the weir body or in the water leading to this upstream river, but the air supply device 4 is placed inside the embankment to avoid flooding, and the two are separated. There are many cases. Therefore, when monitoring, it is necessary to check whether the air is blowing out from the water seal tube 5, but it has been difficult to check.

(Problems to be solved by the invention) This invention was made to solve the problems of the conventional method.It is easy to manage intake air, etc., and has an overpressure prevention function regardless of the increase or decrease in the river water level upstream of the weir. To provide a supercharging air and overpressure prevention device for a bag weir, which is capable of exhibiting the same characteristics, and also allows the state of supercharging air to the bag weir to be known by a horn, and is capable of supplying appropriate air.

(Means for solving the problem) In order to achieve the above object, the present invention includes an air pipe whose one end leads into the weir body and whose other end is connected to the air supply device, and which branches from the air pipe and connects the weir to the weir. A water seal pipe that opens into an upstream river or water leading to it, a water seal tank having an appropriate height that surrounds the opening of the water seal pipe in a sealed state, and a water seal provided above the water seal tank. , a horn that sounds when the internal pressure of the water seal tank increases, the horn having a narrowed hole communicating the inside of the water seal tank with the atmosphere; and an opening of the water seal pipe at the bottom of the water seal tank. The supercharge air and overpressure prevention device for a bag-shaped weir consists of a side branch pipe that is connected at one end to a lower position than the upper part of the pipe, and the other end opens into the upstream river at an appropriate height.

Since the present invention has the above-mentioned configuration, when the river upstream of the weir increases and the water level reaches the height of the weir body, the water level in the water seal tank becomes equal to the water level of the river upstream of the weir. A sealing force corresponding to this pressure acts on the water seal pipe, and when the water level falls, the water level up to the open upper end of the side branch pipe is still maintained in the water seal tank, so the water level upstream of the weir is lowered. Appropriate air can be injected regardless of the size, and when excess air from the lower end of the water seal tube passes through the narrowed hole, a horn sounds and a signal to stop the air supply is obtained.

(Example) First, the principle of overpressure prevention in the bag-shaped weir of the present invention will be explained based on FIG. 1.

The weir body 1 is fixed to the riverbed by a fixing device 2 across the entire width of the river. One end of the air pipe 3 is opened inside the weir body 1, and the other end is connected to the air supply device 4.
is connected to. A water seal pipe 5 branched from the middle of the air pipe 3 opens into a river upstream of the weir or into water leading to the upstream river. Eventually, as the river water level rises or falls, the air pressure inside the weir increases or decreases, and at the same time, the water pressure at the opening of the water seal tube 5, that is, the air pressure that is the reference for control, changes.
Not only the first problem but also the second problem can be solved by this.

Next, the third problem is the amount of air injected while the water level of the upstream river is still low, and the air pressure that will be required when the water level of the upstream river rises.
A water seal tube 5 with a water seal tank 6 having h1 and h2
This problem can be solved by sealing the opening on three sides except the top.

Furthermore, the fourth problem is that the water seal tank 6 is placed in the river upstream of the weir body or in the water leading to this upstream river, but the air supply device 4 is placed inside the embankment to avoid flooding, so the two are separated. Therefore, when monitoring, it is necessary to check the air blowing out from the water seal tube 5. This can be done by using the water seal tank 6. The air jet from the can be used as a horn.

An embodiment of the present invention will be described based on FIG.
In this explanation, the same or similar members in the above explanation of the principle are given the same numbers and the explanation thereof will be omitted.

The water seal tank 6 is sealed on all sides, and a horn 7 is connected to the top.

The horn 7 may be one that sounds when the internal pressure of the water seal tank 6 increases, which has a narrowed hole that communicates the inside of the water seal tank 6 with the atmosphere. For example, as shown in Fig. 4, a flat sphere with two small holes penetrating it vertically is attached to the water seal tank 6 so as to communicate with the atmosphere, or as shown in Fig. 5. Alternatively, a structure similar to that of a musical instrument may be attached to the top of the water seal tank 6.

In addition, a side branch pipe 8 branches from a position lower than the opening of the water seal pipe 5 of the water seal tank 6, and the other end is set at an appropriate height h1.
and open upward into the water at h2.

Therefore, the excess air ejected from the water seal tube 5 becomes bubbles in the water seal tank 6 and rises, and the specific gravity of the air-water mixture becomes lighter by the amount of air bubbles mixed in.
Although the water level rises, the top of the water seal tank 6 is sufficiently high, and when the separated air passes through the narrowed hole of the horn 7, it vibrates and causes the horn to sound.

(Effects) As mentioned above, according to the device of the present invention, regardless of the water level of the river upstream of the weir body, the supercharging air and overpressure prevention functions can be properly performed, and the supercharging state can be used as a warning horn when inflating air. Therefore, there is no need to check the excess air blown out from the water seal tube 5, which is extremely simple in terms of management.

[Brief explanation of the drawing]

Fig. 1 is a diagram explaining the principle of overpressure prevention of the present invention, Fig. 2 is a schematic diagram showing an embodiment of the invention, Fig. 3 is a diagram showing the structure of a conventional bag weir, Figs. FIG. 5 is a longitudinal sectional view of an embodiment of the horn employed in the present invention. 1... Weir body, 3... Air supply pipe, 4... Air supply device,
5... Water seal tube, 6... Water seal tank, 7... Horn, 8...
...side branch duct.

Claims (1)

[Scope of Claim for Utility Model Registration] An air pipe with one end leading into the weir body and the other end connected to an air supply device, and a water seal branching from the air pipe and opening into a river upstream of the weir or into water leading to it. a water seal tube, a water seal tank having an appropriate height and positioned to seal the opening of the water seal tube; and a water seal tank having a narrowed hole provided in an upper part of the water seal tank. a horn that sounds when the internal pressure of the water seal tank increases, the horn communicating with the atmosphere; A side branch pipe that opens into the upstream river at an appropriate height, and a bag-like weir supercharge air and overpressure prevention device.