JPH0427324B2 - - Google Patents

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is applied to a bag weir built for the purpose of taking water from rivers, lakes, etc. for water supply, industrial water, industrial water, power generation, etc. The present invention relates to a water discharging device for discharging condensed water and the like.

(Prior art) Conventionally, all devices of this type consist of a pipe that opens at one end inside the weir body of a bag-shaped weir and at the other end opens into the atmosphere at a low position near the river bed, and a valve is inserted in the middle of this pipe. This system is used to drain accumulated water due to dew condensation by manually opening it as appropriate. Therefore, drainage requires the operation of valves each time, which tends to be poorly managed, and depending on the position of the opening on the drainage side, backflow may occur, making it impossible to drain adequately. It was hot.

(Problems to be Solved by the Invention) The present invention is intended to improve the conventional problems, and includes draining condensed water etc. in the weir at all times without using any human operation or power. Furthermore, the present invention provides a water discharging device for a bag-shaped weir that prevents river water from entering the weir body during times of increased water such as floods, and facilitates the management of the weir body.

(Means for solving the problem) In order to achieve the above object, the present invention provides a means B for supplying pressurized air to a weir body 1 horizontally installed in a river.
, a water discharge basin 6 opened in the weir body 1, and a water discharge chamber 9 provided outside the weir body and communicating with the river downstream of the weir body.
and connect one end to the bottom of the water basin, and the other end,
Cover the water discharge pipe 7 that opens into the water discharge chamber at a height equal to the height of the water discharge basin plus the water column equivalent height of the lowest expected pressure inside the weir, and the opening at the other end of the water discharge pipe. It is composed of a cap body 8 which is open only at the bottom and which is provided as shown in FIG. With this configuration, water such as dew condensation in the weir body 1 is discharged to the river downstream of the weir body through the water basin 6 and the water discharge pipe 7, and water remaining in the water basin 6 and the water discharge pipe 7 is discharged into the river downstream of the weir body. This makes it possible to prevent water from entering the weir body from rivers.

(Example) An example of the present invention will be described based on the drawings.
The weir body 1 traverses the entire width of the river and is fixed to the river bed with an attachment device 2.

Air is forced into the weir body 1 through a ventilation pipe 4 from an air supply device 3 installed near an embankment along the river.
will stand on the river bed. An exhaust valve 5 is interposed in the ventilation pipe 4, and by operating the exhaust valve 5, the press-fitted air inside the weir body 1 can be discharged, and the weir body 1 can be lowered.

Air pressurized into weir body 1 (exclusively atmospheric air)
Since it is cooled by river water, dew condensation occurs on the inner wall of the weir body 1. If the condensation state is left unattended and the operation of raising and lowering the weir body is repeated, the weir body will be filled with condensed water, making it impossible to operate smoothly. Therefore, an opening is made in the riverbed inside the weir body 1,
A basin 6 having a sufficient volume is provided, and one end of the water spouting pipe 7 is connected to the bottom of the basin 6, and the other end is connected to the inside of a cap body 8 provided in a water spouting chamber 9 provided on a bank along a river. Open to. The water discharge chamber 9 has an opening 9a that communicates with the river downstream of the weir body. Further, the cap body 8 is closed at the upper part and the surrounding area, and only the lower part is open to the atmosphere. One end of the water supply pipe 10 is open on the upper surface of the cap body 8, and the other end 10 is open to the atmosphere.
a is a water conduit 11 connected to the river upstream of the weir body 1 at a position slightly lower than the lower end of the cap body 8;
It is open inside.

Note that the volume of the water spout 6 is slightly larger than the volume of the portion of the discharge pipe 7 located at a higher position than the upper end of the water spout 6. In addition, the atmospheric pressure inside the weir body 1 changes depending on the river water level, and of course shows a height depending on the river water level, but it also changes depending on the water discharge pipe 7.
The height difference between both openings is equal to the water column equivalent height of the lowest atmospheric pressure generated within the weir body, and the height difference between the upper opening and the inner top surface of the lowest part is sufficiently larger than the water column equivalent height of the highest atmospheric pressure. Furthermore, the inner surfaces of the upper and lower bags around the discharge basin 6 are made sufficiently smooth so that they can be brought into close contact with each other.

The operation of the embodiment will be explained below.

Air is forced into the weir body 1 by the air blower 3 to make the weir body 1 erect. It is assumed that the water outlet 6, the water outlet pipe 7, and the water conductor 11 are filled with water. When the water level of the upstream river reaches the crest of the weir, the atmospheric pressure within the weir reaches its lowest level, as described above. At this time, the water level in the water outlet 6 is pushed down to the vicinity a of its bottom, and the water level a at the other end side portion (the pressure side portion in FIG. 2) of the water outlet pipe 7 connected to the water outlet 6 is pushed down to the opening end. Being pushed up.

When the weir body 1 is in an upright state, when dew condensation occurs in the weir body 1 and water is supplied to the water outlet 6, the water is discharged from the water outlet 6 through the water outlet pipe 7.
Water does not remain in the water outlet 6.

In this state, that is, when there is no overflow of the weir and the pressure inside the weir is as low as possible, if air is released from the exhaust valve 5 and the weir is collapsed, the pressure inside the weir becomes equal to atmospheric pressure. The water level on the left side of the water discharge pipe 7 falls, and the water level in the water discharge basin 6 rises to the level shown in FIG. 2b. Of course, even in this case, the water in the water outlet 6 will not overflow into the weir body.

Next, a case where the flow rate of a river increases will be explained. In this case, the upstream river water level and the pressure inside the weir will become even higher. Therefore, the water level on the side of the water outlet 6 is even lower and is pushed down to the portion c of the water outlet pipe 7. Then, an overflow occurs at the other end of the water discharge pipe 7. Note that the lowest part of the water discharge pipe 7 is determined taking into account the maximum atmospheric pressure, and even if water is not supplied due to condensation or is lost due to evaporation, etc., the water supply pipe 1
Since water is replenished through 0, air will not blow out from the water discharge pipe 7.

When the weir collapses while the pressure inside the weir is high, the water level on the left side of the water outlet pipe 7 in FIG. has been reduced by overflow, so the water does not overflow into the weir body, and the water surface stops at point d, halfway down the outlet basin 6.

Next, a case will be described in which the water increases in this collapsed state. When the cap body 8 is submerged due to rising water, water pressure is applied to the air inside the cap body 8. Since the other end of the water filling pipe 10 is set at a sufficiently low level, the air inside the cap body 8 is sealed in without flowing out. Ru. Therefore, pressure is applied to the air within the water discharge pipe 7 and, in turn, to the air within the water discharge basin 6. However, since this pressure is lower than the water pressure applied to the weir body 1, the inner surfaces of the upper and lower bags around the discharge basin 6 are brought into close contact with each other by the water pressure.
The air in the water outlet 6 is sealed and pressure is applied to it, compressing it and raising the water level. On the other hand, the water level on the left side of the water discharge pipe 7 is lowered. However, water outlet 6
Since the amount of air remaining inside is small and the volume reduced is also small, air does not flow into the water outlet 6 side. Furthermore, if necessary, the problem can be solved by increasing the cross-sectional area of the left side portion of the water discharge pipe 7 that is equal to or less than d. Furthermore, at this time, the air inside the water discharge pipe 7 and the cap body 8 is also compressed, so that the water level inside the cap body rises. It goes without saying that the volume of the cap body 8 below the upper opening of the water discharge pipe 7 should be determined with a sufficient margin in mind to compress all of these air portions. The water surface inside the cap body 8 does not reach the opening of the water discharge pipe 7 even at the time of maximum overflow, and no overflow water flows into the water discharge pipe 7. The water level in this state is e in Figure 2.

(Effects) Since the present invention has the above-mentioned configuration, it is possible to automatically discharge condensed water, etc. without any manual operation, and to prevent the weir body from being inadvertently blown out by blowing out air. There is no need to collapse, there is no contamination of the inside of the weir due to inflow of flood water, the structure is simple, there are few failures, and it can be provided at low cost.

[Brief explanation of drawings]

FIG. 1 is a plan view of the device of the present invention, with half of the river omitted. FIG. 2 is an explanatory view of the apparatus of the present invention, showing the water discharge basin, water discharge pipe, and water discharge chamber on the same plane, and FIG. 3 is an explanatory view of the relationship shown in FIG. 2, viewed from the side of the weir body. 1... Weir body, 6... Outlet basin, 7... Outlet pipe, 8
...Cap body, 9...Water discharge chamber, 10...Water supply pipe.

Claims (1)

[Claims] 1. A means for supplying pressurized air to a weir body installed horizontally on a river, a water outlet that opens into the weir body and has a volume sufficient to accommodate water in the weir body when the weir body collapses, and a One end is connected to the water discharge chamber which communicates with the river downstream of the weir and the bottom of the water discharge basin, and the other end is connected to the height of the discharge basin, and the water column equivalent height of the lowest expected pressure inside the weir is connected to the bottom of the discharge basin. The water discharge pipe is formed by opening into the water discharge chamber at a height plus the height of the water discharge pipe, and a cap body is provided to cover the opening at the other end of the water discharge pipe and is open only at the bottom. Fukufushi weir water discharging device.