JPS5948244B2 - Multiple flexible membrane undulating weir - Google Patents

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 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 large-scale rivers, it is conceivable to use a multiple system in which the river is divided by weir columns in the transverse direction.

That is, this may be expected 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 rivers, the function is to completely collapse the weir in the event of a flood, and to control the water level or discharge amount in order to effectively utilize stored water for industrial water, etc., or in the case of weirs near the river mouth, to prevent tidal backflow. The need will arise.

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 expand and rise with water are easy to control because when they contract and collapse, the crest of the weir collapses at the same level in the river-crossing direction.

On the other hand, water-expandable weirs are more expensive than air-expandable weirs due to the larger pipe diameter 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, including during floods, by making minute adjustments to the water level or discharge amount using a water-inflatable platform, and by making stepwise adjustments using an air-inflatable platform.

The invention will now be described in detail with reference to 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 Fig. 1, in a multiple type flexible membrane undulating weir, if minute control of water level or discharge amount is required, an appropriate number of internal water expansion type weirs 3.7 etc. are installed in all weirs. Installed and controlled by this water expansion type weir, others are air expansion type weirs 1
．． 5. It is 9th grade.

Note that 2 in Figure 1. 4. 6. 8 is a base pillar, 10 is a river bed, 11 is an air inflatable platform inlet/exhaust pipe, and 12 is a water inflatable weir inlet/outlet pipe.

For example, a method for controlling the upstream water level of the water expansion type weir will be explained with reference to FIG. 2.

In Figure 2, 3 is the weir body, 10 is the riverbed, 23 is water, 24 is the siphon pipe, 25 is the drain pipe, 26 is the collapsed water level, 27 is the water injection pump, 28 is the compressor, 29 is the compressed air tank, 30 is automatic opening/closing Valve, 31 is an upstream water level detection pipe, 32 is a tank, 33 is a float, 34 is a valve (automatic opening/closing valve based on float type water level detector signal) 35 is a pressure regulating valve, 36 is a drainage pump, 37 and 38 are electrode rods. It shows.

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 maintained at point Y, which is the reference 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 when the upstream water level reaches point Y.

Also, if the upstream water level does not fall to point Y and the water level inside the weir reaches point W, which is zero, the switch is turned off.

When the upstream water level reaches point Z, 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 at point Y.

Also, if the upstream water level does not reach point Y and the water level in the siphon pipe reaches 8 points, which is the siphon pipe operation warning value, the switch is turned off.

The on/off operation based on the above 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 L1゜L2. L3 is the upstream water level X, Y, respectively.
L4, which is made to coincide with the Z point, is provided below L3.

When power is applied between LI and L2, the water in the weir begins to be drained by turning on the drain pump 36, and reaches the upstream water level at point Y.

, L3 becomes insulated and the drain pump is stopped.

Also L3. Due to the insulation between L4, water begins to be injected into the weir body when the water injection pump 27 is turned on and L2. Water injection pump 2 is activated by energizing L3.
7 stops and the upstream water level is controlled.

Further, the on/off operation by the W point and the 8 points is performed by the electrode rod 38 in the same manner as above.

Align electrode rod contacts L5 and L6 with points S and W, respectively, and L7.
is provided below L6.

L5. Water injection pump 27 is stopped by energizing L6, and L6 is energized.
6. Due to the insulation between L7, the drainage pump becomes 36 steps.

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

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

Note that FIG. 3 shows the flow of the above-mentioned operating mechanism.

For example, the water level control method using a water expansion weir is as shown in Figure 2. In Figure 2, the collapse water level 26 of the water expansion weir is also applied to the air expansion platform, and it can be handled by operating the water expansion weir. For water levels (flow rates) that cannot be achieved, the air inflatable stage can be raised and lowered to accommodate this.

1 The operation of the air inflatable platform is either fully inflated or collapsed, and the water level or flow rate is not controlled by the degree of collapse like in the case of water inflatable weirs. A control method is used in which one unit is operated individually or multiple units 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 expansion type undulation weir, 1 is an air expansion type undulation weir, 15 is an air intake (water) pipe, and 16 is an exhaust (water) pipe, and the upstream water level is level 1 (26). : Lodging water level of all weirs, Level 2 (X): Controlled maximum water level, Level 3 (Y): Controlled intermediate water level, Level 4 (Z): Controlled minimum water level □.

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

However, the base number of the air inflatable platform is that if all weirs including the water inflatable weir are completely collapsed and the upstream water level is level 4, and the air inflatable undulating weir is fully erected, the upstream water level will not rise above level 2. It shall be determined as follows.

In the above, it is assumed that all the weirs collapse once in the process from normal control to flood control.

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

In other words, FIG. 5 shows a general schematic diagram of weir operation for the upstream water level control range.

G and P in the figure 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.

According to the present invention as described above, it is possible to obtain a multiple flexible membrane undulation weir that is inexpensive and enables water level or water discharge control.

[Brief explanation of the drawing]

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. 3 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. 1, 5. 9... Air inflatable undulating weir, 3,7
・・・・・・Water expansion type undulating weir, 2. 4. 6. 8・
...Base pillar, 10...River bed, 11...
・・Inlet and exhaust pipe for air inflatable platform, 12・・・・Inlet and drain pipe for water inflatable platform.

Claims (1)

[Scope of Claims] 1. The weir is constructed by attaching a flexible membrane envelope to the river bed, feeding an expansion medium into the interior of the envelope to cause it to expand and raise it up, and discharging the expansion medium from the interior of the envelope to cause it to contract and fall down. These weirs are arranged in multiple directions across the river flow, with at least one weir whose expansion medium is water and one weir whose expansion medium is air. A multiple flexible membrane undulating weir characterized by the ability to control water level or discharge amount. 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, shall be set so that each will operate when the river water level is below the design flood water level. The multiple flexible membrane undulating weir according to claim 1, wherein all the weirs are reliably collapsed during a planned flood.