JPH0368164B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a flexible membrane undulating weir, and more particularly to a flexible membrane undulating weir whose V-notch position can be controlled.

(Prior art) As shown in Fig. 4, a flexible membrane undulating weir is constructed by inserting a flexible membrane envelope (bag-like body) 1, such as rubber-coated cloth, which forms the weir body, in a direction across the flow of a river, etc. It is attached to at least the floor of a river, etc., and a pressure medium such as air, water, or both of these is introduced into the interior of the envelope to expand and erect the envelope, and the pressure medium is discharged from the interior of the envelope to cause the envelope to contract and fall down. (For example, the Special Publick Act of 1977-
11702, Special Publication No. 44-2371).

In the air expansion type of this type of undulating weir, which uses air as the medium pressure medium, during the undulating process, if the internal pressure is low, a V-notch phenomenon (when the internal pressure of the weir falls below a certain value), as shown by the imaginary line in Figure 3, occurs. Then, a part of the top of the weir becomes V.
There is a sharp decline in the shape of a letter. 13 is V-notch)
There is a characteristic that occurs.

The location where this V-notch occurs depends on the specific flow center position of the river at the location where the undulating weir is installed, the accumulation of sediment on the upstream side of the envelope, etc., and it is impossible to control the V-notch position to an arbitrary location. It was hot. Therefore, it is difficult to increase the strength of specific areas on the concrete surface of the riverbed to prevent it from being damaged by water discharge.

On the other hand, on the other hand, since the river flow conditions at the location where the undulating weir is installed are generally limited, the locations where V-notches occur are also limited, so the river channel at the same location is disturbed by V-notches, in other words, concentrated discharge. Also, there were drawbacks such as the fact that sediments other than the V-notch points were not flushed out.

In Fig. 4, 2 is the concrete surface of the riverbed where the envelope is attached, 3 is the concrete surface of the side wall where the envelope is attached, 8 is an inlet/exhaust pipe, 9 is an inlet/exhaust port, and 11 is an air chamber.

In order to eliminate these drawbacks, the following undulating weir has already been developed by the applicant (September 1982).
(filed on May 25th, Patent Application No. 1983-201315).

That is, conventionally, the above-mentioned undulating weir has an integral air chamber 11 as a covering.
(See Figure 4)
A partition membrane is provided inside the envelope to form a plurality of independent air chambers lined up in a direction transverse to the river flow, and an inlet/exhaust pipe is provided for each air chamber.

According to the above, by first discharging the air from the air chamber at a predetermined position of the envelope, the V-notch or the lodging discharge location can be arbitrarily controlled.

(Problem to be solved by the invention) However, in the above, depending on the shape of the partition membrane, for example, in the case of the most common flat plate-shaped partition membrane, even if it is not rigid, when the weir collapses. This got in the way and made it difficult to fall down smoothly and sufficiently.

In view of the above, the present invention provides a flexible membrane undulating weir that can be lowered smoothly and sufficiently even when it is provided with this type of partition membrane.

(Means for Solving the Problems) That is, in the flexible membrane undulating weir of the present invention, a flexible membrane envelope forming a weir body is attached to the river bed in a direction transverse to the river flow, and the envelope is In an air-inflatable weir, in which air as a pressure medium is sent inside to expand and raise the weir, or to expel air from the inside of the envelope to cause it to collapse, a flexible membrane is placed inside the flexible membrane envelope. A plurality of independent air chambers lined up in a direction transverse to the river flow are provided using a wooden partition wall, and each is provided with an independent air intake and exhaust pipe, so that the air in the air chamber at a predetermined position in the envelope is first drawn. The V-notch generation position can be controlled by discharging the V-notch. The invention is characterized in that the open end is attached to the inner peripheral side of a flexible envelope.

Note that the above-mentioned direction of crossing the river flow is not limited to a direction of crossing the river flow perpendicularly, but is broadly interpreted to include a direction of crossing the river flow diagonally.

(Function) In the above, since the partition wall uses a flexible membrane in the form of a cylinder with one end open and the other end flatly closed, that is, it has an envelope shape, so when the air is exhausted, Press down smoothly.

The present invention will now be explained in detail with reference to illustrative figures 1, 2 and 3.

As shown in FIG. 1, a partition membrane 12 made of a flexible membrane is provided in an envelope 1 that crosses a river and constitutes a weir body, and a plurality of independent air chambers 11' are arranged in a direction across the river. , 11'', 11... are formed, and separate inlet/exhaust pipes 8', 8'', 8... are provided for each air chamber, and arbitrary exhaust valves 10', 10'', 10... are opened to open an arbitrary exhaust valve 10', 10'', 10... Exhaust the air from the air chamber and let it fall down.
The V-notch or the lodging discharge location can be arbitrarily controlled by sequentially collapsing any air chamber.

In Fig. 1, 4 is an operation room, 5 is a blower, 6',
6″, 6 is the intake valve, 7′, 7″, 7 is the intake pipe,
9′, 9″, 9 are inlet and outlet ports.

In the above, the present invention particularly uses a cylindrical flexible membrane 14 having an envelope shape, that is, one end is open, and the other end is flatly sealed, that is, closed, for the partition wall 12, as shown in FIG. ing.

The flexible membrane 14 may be attached directly to the inner periphery of the flexible membrane as shown in Figure 1, or the flexible membrane 14 may be attached to the inner periphery of the envelope as shown in Figure 2. It may also be attached via the fins 15. Attachment may be done by gluing, fasteners, sewing thread or rope, magic tape, etc.

According to the above, it becomes possible to first exhaust the air in the air chamber at a predetermined position of the envelope.

When the air in the air chamber is exhausted, the flexible membrane forming the partition wall is folded smoothly because it is envelope-shaped, and the weir cover 1 is contracted and laid down.

In the above, the position of the partition membrane and the number of independent air chambers may be set arbitrarily, and are not limited to the three divisions shown in FIG. The partition membranes may be attached in the same direction as shown in FIG. 1, in opposing directions, or in opposite directions, depending on the desired design.

Also, the partition wall may be installed before or after the weir is installed.

Further, the partition wall may or may not be completely airtight. In the latter case, the total cross-sectional area of the hole in the partition wall is made smaller than the cross-sectional area of the air intake and exhaust pipes of the air chamber partitioned by the partition wall.

Further, the partition wall may be attached directly to the inner periphery of the envelope with a flexible membrane, or via fins. If the partition wall is removable, it will be convenient for people to come in and out and tools to go in and out during repairs.

(Effects of the Invention) The present invention has been described above, and the present invention has the following effects.

A partition membrane is provided within the envelope to provide multiple independent air chambers, each of which is provided with an inlet/exhaust pipe. Therefore, the V-notch or the lodging discharge location can be controlled as desired.

Moreover, during exhaust, the partition membrane breaks smoothly and the weir is smoothly reduced.

[Brief explanation of drawings]

Fig. 1 is a front view (Fig. a) and its A-A sectional view (Fig. b) of a flexible membrane undulating weir of the present invention, and Fig. 2 is an alternative method of attaching a partition wall according to the present invention. FIG. 3 is a vertical front view showing an example, FIG. 3 is a perspective front view of a flexible membrane constituting a partition wall used in the present invention, and FIG. 4 is a front view of a conventional undulating weir made of a flexible membrane. ing. DESCRIPTION OF SYMBOLS 1... Flexible membrane envelope, 2... Concrete surface of the river bed where the envelope is attached, 3... Concrete surface of the side wall where the envelope is attached, 4... Operation room, 5... Blower, 6, 6',
6″, 6……Air intake valve, 7, 7′, 7″, 7……
Inlet pipe, 8, 8', 8'', 8... Inlet and exhaust pipe, 9,
9', 9'', 9... Inlet/outlet, 10, 10', 1
0″, 10……exhaust valve, 11, 11′, 11″,
11...Air chamber, 12...Partition membrane, 13...V
Notch, 14... Flexible membrane, 15... Fin.

Claims (1)

[Scope of Claims] 1. A flexible membrane envelope forming a weir body is attached to the river bed in a direction across the river flow, and air as a pressure medium is sent into the interior of the envelope to cause it to expand or rise from the inside of the envelope. In an air-inflatable weir that discharges air and collapses, a plurality of flexible membrane partition walls are provided inside the flexible membrane envelope and are lined up in a direction across the river flow. By providing independent air chambers and providing independent air intake and exhaust pipes for each, it is possible to control the position where the V-notch occurs by first discharging the air from the air chamber at a predetermined position in the envelope. The partition wall is made of a cylindrical flexible membrane with one end open and the other end closed flat, and the periphery of the open end is attached to the inner peripheral side of the flexible membrane envelope. An undulating weir made of a flexible membrane characterized by the following structure. 2. The flexible membrane undulation weir according to claim 1, wherein the partition wall is airtight. 3. Claim 1, wherein the partition wall has one or more holes, and the sum of the cross-sectional areas of the holes is smaller than the cross-sectional area of the air supply and exhaust pipes of the air chamber partitioned by the partition wall. An undulating weir made of flexible membrane. 4. The flexible membrane undulation weir according to claim 1, wherein the partition wall is attached to the flexible membrane envelope before installation of the undulation weir. 5. The flexible membrane undulating weir according to claim 1, wherein the partition wall is attached to the flexible membrane envelope after the undulating weir is installed. 6. The flexible membrane undulating weir according to claim 1, wherein the partition wall is attached via fins provided on the inner periphery of the flexible membrane envelope. 7. The flexible membrane according to claim 1, wherein the partition wall is attached via a fin provided on the inner periphery of the flexible membrane envelope, and the partition wall is removable from the fin. undulating weir.