JPS5813812A - Multiply connected falling dam made of flexible film - Google Patents

Abstract

PURPOSE:To permit detailed control on a multiply connected falling dams of a flexible film during the period from reduced river water flow time to flooded river water flow time by using a system in which the level of water and the amount of water discharged are finely regulated by a water-expanding type dam and also stepwisely regulated by an air-expanding type dam. CONSTITUTION:In a multiply connected falling dam of a flexible film, when the fine control of the level of water and the amount of water to be discharged is needed, the control is made by varying the heights of the water-exnpanding type dams 3 and 7 of all the dams. Also, when the level of water and the amount of water to be discharged can not be controlled by operating the water-expanding type dams 3 and 7 alone, or during the run-off period, the control is made by raising or falling down air-expanding type dams 1, 5 and 9. In the operation of the air-expanding type dams 1, 5 and 9, any of complete expansion and falling is only made but the water level and flow rate are not controlled as done by the water-expanding type dams. However, according to the conditions of river water, only one air-expanding type dam is operated singly or with the water-expanding type dams 3 and 7. In this way, a control system using combinations of operations is used.

Description

[Detailed description of the invention] The present invention relates to a multiple flexible membrane undulating weir.

A flexible membrane envelope (bag-like body) is attached to the riverbed in the direction across the river, and this is used in undulating weirs that make it possible to rise and fall by injecting and discharging water or air inside the envelope. When applied to a large-scale river, it is conceivable that the river would be divided into multiple sections by multiple pillars in the transverse direction. In other words, this is assumed due to weight or size restrictions when transporting the envelope to the site, water changes during installation work, and management after installation.

On the other hand, in large-scale rivers, the function is to completely collapse the weir in the event of a flood, and the water level or discharge amount is controlled in order to effectively utilize the stored water for industrial water, etc., or to prevent backwashing of the weir near the river mouth. It becomes necessary to do so.

In response to these demands, when weirs that are expanded and erected with air are collapsed with buckling (notch phenomenon), the stored water flows down all at once, making it extremely difficult to control the water level or the amount of discharge. It's difficult. On the other hand, weirs that are expanded and erected by water are easy to control because when they contract and collapse, the top of the layer collapses at the same level in the river-crossing direction.

- Hydraulic expansion type weirs are more expensive than air expansion type weirs due to the larger diameter of the pipes for water injection and drainage (air).

In view of the above points, the present invention proposes that when installing multiple undulating weirs made of flexible membranes on large-scale rivers, an appropriate number of water-inflatable weirs and air-inflatable weirs are installed in accordance with the requirements for controlling the water level or discharge amount. The present invention provides a weir that can be controlled over a wide range of conditions, including during floods, by making minute adjustments to the water level or discharge amount using a water expansion weir and by making stepwise adjustments using an air expansion weir.

The invention will now be explained in detail with reference to the illustrative drawings, but is not limited thereto.

FIG. 1 shows the multiple flexible membrane undulating weir of the present invention. In other words, as shown in Figure 1, in the case of a multi-layered flexible membrane undulating weir, where minute control of the water level or discharge amount is required, a full-thickness inland water expansion type weir (such as (7) in 3) is used. A suitable number of weirs are installed and controlled by this water expansion type weir.Others are air expansion type weirs (1), (5), (9), etc.

Note that (2), (4), (6), and (8) in Figure 1 are base pillars,
(10) is the river bed, (11) is the inlet and exhaust pipe of the air expansion weir,
(12) is the water-expansion type weir's injection and drainage pipe.

For example, a method for controlling the upstream water level of the water expansion type weir will be explained with reference to FIG. In Figure 2, (3) is the weir body, (10) is the river bed,
゛(23) is water, (24) is siphon tube, (2
5) is the drain pipe, (26) is the collapsed water level, (27) is the water injection pump, (2B) is the compressor, (29) is the compressed air tank, (filter 0) is the automatic opening/closing valve, (61) is the upstream water level detection pipe , (32) is a tank, (33) is a float, (64
) is a valve (automatic open/close valve based on float type water level detector signal)
(65) is a pressure regulating valve, (66) is a drainage pump, (37
) and (38) indicate electrode rods.

The weir body is raised and lowered when the water injection pump (27) is turned on (ON), and turned off (OFF) at the designed internal pressure, and the river upstream water level is
It is maintained at point Y, which is the standard for the upstream water level control range.

When the upstream water level reaches point X, which is the upper limit of the upstream water level control range, the drainage pump (36) is turned on and the water in the weir begins to be discharged, and is turned off at the upstream water level at point Y. If the upstream water level does not fall to point Y and the water level inside the weir reaches point W, which is zero, it will turn off.

When the upstream water level reaches one point, which is the lower limit of the upstream water level control range, the water injection pump (27) is turned on to start injecting water into the weir body, and is turned off at the upstream water level Y point. If the water level upstream of the father does not reach point Y and the water level in the siphon pipe reaches 5 points, which is the siphon pipe operation warning value, the switch will be turned off.

The on/off operation based on the x, y, and z points is performed by detecting the water level by installing an electrode rod in a water storage tank communicating with upstream water. Electrode rod contact (Ij).

(L2) and (Ls) are the upstream water level estimates X, Y, and Z, respectively.
Match the point and set it below (Ls).

When the drain pump (36) is turned on by energizing between (Ll) and (L2), the water in the weir begins to be discharged and at the upstream water level Y point (L2
) and (1) are insulated and the drainage pump is stopped. Also (Lx).

Due to the insulation between (L4), water starts to be injected into the weir body when the water injection pump (27) is turned on (L2), and when the water injection pump (27) is energized between (Ls), the water injection pump (27) is stopped and the upstream water level is controlled.

Also, the on/off operation by the W point and the 5 points is performed by the electrode rod (38) in the same manner as above. Electrode rod contact (Ls).

(Ls) coincides with the points S and W, respectively, and (Ll) becomes (Ls
). The water injection pump (27) is stopped by energizing between (L5) and (Ls), and (Ls) and (Ll
) is insulated between drain pump + (36) stop.

The automatic opening/closing valve (30) is closed by opening the pressure regulating valve (35) via the compressor (28) and compressed air tank (29), but the upstream water level detection pipe (31) detects the overflowing water level (26). When detected, the valve (34) is opened.

As described above, the height of the weir is changed by increasing or decreasing the amount of water within the weir body, and changes in upstream water level due to increases and decreases in river water are controlled within the design range below the planned lodging water level.

Note that FIG. 6 shows the flow of the above-mentioned operating mechanism.

For example, the water level control method using a water expansion weir is shown in Figure 2.
This is also applied to air-inflatable weirs, and water levels (flow rates) that cannot be handled by operating water-inflatable weirs are dealt with by raising and lowering the air-inflatable weir.

Operation 1 of the air-inflatable weir is either full expansion or collapse, and unlike water-inflatable weirs, the water level or flow rate is not controlled depending on the degree of collapse, but the water-inflatable weir is controlled depending on the river conditions, such as the increase/decrease rate of inflow. A control system is used in which one weir or multiple weirs are operated simultaneously, and each operation is combined.

For example, in the case of upstream water level control, the control water level and related weir operations are shown below. In Figure 4, (3
) is a water-inflatable undulating weir, (1) is an air-inflatable undulating weir, (1
5) is the intake (water) pipe, (16) is the exhaust (water) pipe,
Upstream water level is level 1 (26): Lodging water level of all layers, level 2 (
X): Maximum control water level, Level 3 (Y): Intermediate control water level, Level 4 (Z): Minimum control water level.

The concept of weir operation for each upstream water level is shown below.

However, the base number of the air inflatable weir is that if all layers including the water inflatable weir are completely collapsed and the upstream water level is level 4, and the air inflatable relief weir is fully erected, the upstream water level will not rise to level 2 or higher. It shall be determined as follows.

Control classification Upstream water level Weir operation (H)
(The air platform is (A) and the water weir is the target, and the number of weirs is a and b, respectively.) Level 4 ≦ H Level 3 Axa group: Fully standing M x (1
~b group): Depending on the inflow from the upstream side of the weir, single (- group) or multiple simultaneous erecting H = two levels Axa group: Completely erecting M x (1~b
Base): Stopping level 6 for both standing and lowering operations H≦Level 2 AXa base: Complete standing M x (
1 to b groups): Single or multiple simultaneous lodging level 2<H<level 1 depending on the inflow from upstream of the weir M×b group: Complete lodging A×(1
- a group): Single or multiple simultaneous lodging level 3 (H≦Level 2) depending on the inflow amount from upstream of the weir.Ax (1 to a group): Single or multiple simultaneous uprighting depending on the inflow amount from upstream of the weir b group Complete lodging level 4≦H (Level 3 Axa group: Complete standing M field x (
Groups 1 to b): Depending on the amount of inflow from the upstream side of the weir, the entire layer is assumed to collapse once during the process from normal control to flood control.

The control method described above takes advantage of the advantage that the water expansion type weir can adjust the height of the weir from fully erected to collapsed, that is, it is possible to make fine adjustments to the water level or discharge amount. It is possible to adjust the water level or discharge amount in stages by fully raising and lowering the weir, and by combining these, fine control is possible from the time of low river flow to the time of flood.

A general schematic diagram of weir operation for the upstream water level control range is shown in Figure 5. In the figure, p) and (P) are as follows.

G: Stepwise control The air expansion type weir is operated singly or in combination depending on the inflow amount, and the water level is adjusted stepwise with a water level width of P.

P: Partial control The water level is finely adjusted by operating one or more water expansion weirs at the same time within the water level width of P depending on the inflow amount.

[Brief explanation of drawings]

Figure 1 is an explanatory diagram of the multiple flexible membrane undulating weir of the present invention viewed from the river flow direction, and Figure 2 is an explanatory diagram of the upstream water level control method of the water-inflatable flexible membrane undulating weir. , FIG. 6 is a diagram showing the operating mechanism flow of the control method explained in FIG. 2, and FIG. 4 explains the water level control method in the multiple flexible membrane undulating weir of the present invention shown in FIG. 1. 5 each illustrate a schematic diagram of the water level control method explained in FIG. 4. (D, (5), (9)...Air inflatable undulating weir, (
3), (7)...Water expansion type undulating weir, (2), (4
), (6), (8)...Base pillar, (10)...River bed, (11)...Inlet/exhaust pipe of air inflatable platform, (12)
...Injection and drainage pipes of water expansion weir (Fig. 4) Fig. 5

Claims (2)

[Claims] (1) The weir is constructed by attaching a flexible membrane envelope to the river bed so that an expansion medium can be introduced into the interior of the envelope to cause it to expand and stand up, and the expansion medium can be discharged from the interior of the envelope to cause it to collapse and fall down. Such weirs are constructed by installing multiple weirs in the direction across the river flow, each with at least one weir whose expansion medium is water or air, to control the upstream water level or the discharge amount. A multiple flexible membrane undulating weir characterized by making it possible to (2) The installation level of the air blow-off tank or siphon pipe, which is an overpressure prevention device for the internal pressure of the weir body of the flexible membrane undulating weir, is set so that each operates when the river water level is below the planned flood water level. A multiple flexible membrane undulating weir according to claim 1 or 2, which is set such that all layers are reliably collapsed during a planned flood.