JPS6037244B2 - weir - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a weir that is installed on a river bed in a direction across a river channel and that makes undulations by introducing or expelling water into the interior of a flexible bag.

Conventionally, water-type weirs were used as water intake weirs installed across rivers, agricultural water, etc., to store water by forcefully pumping water into a flexible bag and causing it to expand. A dam is used. However, with this water type,
When starting to fill water into the deflated, maneuverable bag, it is difficult for water to enter, so it is necessary to supply relatively high pressure water, which requires a separate water pump or a reservoir at an elevated location. The equipment had become large-scale.

For this reason, in recent years, flexible bags have been designed to supply water to the air inside the bag, but in this case, it is difficult to keep the weir height constant over the entire length. This causes a problem.

In other words, while supplying air for undulation,
When water is supplied, water and air come into direct contact within the flexible bag, but in this case, the amount of air in the center of the weir, which is most likely to deform due to water flow, is reduced ( (Air is biased toward both sides of the flexible bag), and the height of the weir at the center becomes locally lower than that at both sides. The present invention solves the conventional problems and provides a weir whose weir body can be easily erected.

In order to achieve the above object, the present invention provides for installing an outer bag on a river bed in a direction across a river channel, communicating the inside of the outer bag with an upstream river, and having an inner bag inside the outer bag along its entire length. A bag is stored, and an air injection device for pressurizing air is connected to the inner bag, and air is pressurized into the inner bag to inflate it, and the buoyancy of the inner bag causes the air to be inflated. The present invention is characterized in that upstream river water is introduced into the outer bag so that the outer bag is inflated and erected.

With this configuration, air is admitted into the inner bag, and by the buoyancy of the inner bag, upstream river water is introduced into the outer bag according to the upstream water level, and the outer bag eventually expands and stands up. can be done. While the weir body is being erected, the inner bag functions as a float and maintains the weir term of the weir body substantially constant over the entire length. The weir body may be lowered by discharging the air from the inner bag body by an appropriate means and by forming an outlet in the outer bag body by an appropriate means. An embodiment of the present invention will be described below with reference to the drawings.

In Figure 1, river A is assumed to flow in direction B, and river bed D of river A has a weir x
is installed.

The weir body X expands by filling the inside with air,
An inner bag body 1 that contracts by discharging air, and an inner bag body 1 that accommodates the inner bag body 1 along the longitudinal direction.
It consists of an outer bag body 2 that expands and stands up when water is introduced into the interior due to the buoyancy of the body, and contracts and collapses when water is discharged. The inner bag 1 and the outer bag 2 are each made of a flexible sheet member such as rubber, and the inner bag 1 is airtight and the outer bag 2 is watertight. The outer bag body 2 has its ends overlapped with each other and integrally fixed to a sealing sheet 3 laid on the river bed by a clamp device (not shown). Even when a large pressure is applied to the bag body 2, it is firmly held. The water pipe 4, which has one end opened on the upstream side C of this weir body × and the other end closed on the downstream side 〇, has a venturi part 5 that narrows the pipe line, and a venturi part 5 downstream of this venturi part 5. It has a siff-on part 6 which is a tube bent in a brocade shape and is capable of siff-on action.

The inside of the water passage pipe 4 and the inside of the outer bag body 2 are connected to each other by a passage pipe 7 having one end opened on the side surface of the venturi portion 5. As will be described later, when the deflated outer bag body 2 is raised to a certain height, the inner bag body 1 performs a float function by pumping air with a pressure slightly higher than atmospheric pressure, and also functions as a float. This function is to maintain the shape of the upper end of the bag 2, that is, to keep the height of the weir constant.

In FIG. 2, an air supply pump 8 is disposed near the weir body x, and is connected to the inner bag body 1 through a ventilation pipe 9.

The end of the exhaust pipe 1 branched from the middle of the ventilation pipe 9 is opened to the atmosphere, and an on-off valve 1 is installed in the middle of this exhaust pipe 10.
1 is provided. In FIG. 2, 12' is a valve for opening and closing the passage of the ventilation pipe 9 as required. The float chamber 12 is connected to the upstream side C of the weir body X through a water conduit 13.

In addition, the float chamber 12 includes a siphon portion 6 of the water pipe 4.
A water suction pipe 14 extends from the top of the weir, and its pipe end 14a is opened at a height corresponding to the water level on the upstream side C when the weir body X is completely collapsed, that is, the lowest water level 15 on the upstream side. This water suction pipe 14 sucks up the water in the float chamber 12 by the negative pressure at the top of the siff-on part 6 when draining the water in the outer bag body 2 by the siff-on action of the siff-on part 6 of the water pipe 4. The on-off valve 11 linked to the lowering of the water level in the float chamber 12 is operated to allow the exhaust pipe 10 to pass through to the atmosphere, and the inner bag body 1 is opened.
The air inside can be exhausted to the atmosphere. The diameter of the water suction pipe 14 is made sufficiently larger than the diameter of the water guide pipe 13 in order to sufficiently perform the function of sucking up water in the float chamber 12. Also, in the figure, the upstream water level 16 and the water intake pipe 14
The pressure generated from the height difference h with respect to the horizontally extending tube core shall be sufficiently 4 mm higher than the negative pressure of the siffon section 6 when the siffon is activated. In the weir of the present invention having the above configuration, when air is pressurized into the inner bag 1, the inner bag 1 floats as the water level on the upstream side C changes, and the outer bag 2 accordingly introduces upstream river water. It will expand and stand up.

Note that the upstream required lodging level 17 that determines the lodging of the weir may be the siphon crest height. The interior of the inner bag body 1 is evacuated by operating the on-off valve 11 which directly detects the required upstream collapse water level 17.
In the weir according to the present invention, the on-off valve 11 utilizes the buoyancy of the float 18, and has the configuration shown in FIG. 3, for example.

That is, the float 18 floats on the same water level as the water level on the upstream C side in the float chamber 12, which is connected to the upstream side C by the water conduit 13, and the float 18 floats due to fluctuations in this water level.
A T-shaped arm 20 that rotates around a fulcrum 19 as the T-shaped arm 20 is vertically displaced; A lever 22 supported by a lever 21, a weight 24 for moving the lever 22 to a stopper 23 when the T-shaped arm 20 rotates clockwise in the figure, and a spool 25 for controlling the vertical displacement of the lever 22. It consists of a valve body (not shown) inside the on-off valve main body 26 that opens and closes the conduit of the exhaust pipe 10. In the figure, 27, 27' are wires, 28, 28
′ is a pulley. Next, the operation of this embodiment will be explained.

To raise the weir body Stand up to some extent. At the time when the weir body X is erected, the pipe line of the exhaust pipe 10 is in a closed state by the on-off valve 11. The flow is rapid on the upper surface of the weir body X, which has risen to some extent due to the rise in the water level of the river A.

Therefore, the water on the upper surface of the weir has a lower pressure head than the water on the upstream side C that has entered the water pipe 4, so as the water level of the river A rises, the water pipe 4, the venturi part 5, and the lotus pipe It floats up naturally due to the pressure of the water passing through it. In this way, the weir body X stands up at the height of the set upstream water storage level 16. Now, when water gradually accumulates on the upstream side C during a flood and finally reaches the upstream side collapse required water level 17, the water has reached the top of the siffon section 6 of the water pipe 4, so the siffon action works and the venturi section 5 causes the water inside the outer bag body 2 to be sucked out, so that the weir body X gradually collapses.

Moreover, at the same time, the water in the float chamber 12 is sucked up from the water suction pipe 14 by the negative pressure at the top of the siphon section 6, so that the water level in the float chamber 12 gradually lowers. During this operation, the diameter of the water conduit pipe 13 is sufficiently smaller than that of the water suction pipe 14, so the amount of water sucked into the float chamber 12 is
The amount of water introduced into the tank is small, and water is sufficiently absorbed. As the water level in the float chamber 12 decreases, the float 18 descends, the pulley 28 rotates, and the T-shaped arm rotates counterclockwise as shown by the arrow in FIG. Up to this point, the weir crest of weir body x is not made wave-like by the inner bag body 1, so the overflow is uniform over the entire weir length.
In other words, the inner bag 1 to which air is supplied extends in the transverse direction of the river channel, but it always resists the force from the water flow acting in the direction crossing this by its own elastic force. Since it acts to maintain the straight state, the top of the outer bag body 2 (the top of the weir body X) can wave over its entire length and maintain a substantially constant height. This effect is clearly shown in FIGS. 4 and 5. 5 shows a case where water and air are directly mixed in the outer bag 2 without providing the inner bag 2, and FIG. 4 shows the case according to the present invention. In this case, the top surface of the central part of the outer bag body 2 is deformed and becomes locally low (this part is indicated by the reference numeral 29).
, and both side portions also undergo local concave deformation (this deformed portion is indicated by reference numeral 30), whereas in the case of the present invention shown in FIG. 4, the inner bag body 1 to which air is supplied is , because it maintains a straight state against the force of the water flow due to its own elastic force, it can almost completely prevent the formation of localized low spots as described above. Note that the inner bag 1 may be stored in the outer bag 2 without any special positional restrictions, but it may be fixed to the outer bag 2 along the top of the outer bag 2 when it is erected. Of course, it is also possible to do so.

When the float 18 reaches a predetermined lowering position, the ring 20a of the T-shaped arm 20 is released from the lever 22, and the lever 2
2 is pulled by a weight 24 and rotates counterclockwise about a fulcrum 21. Due to this displacement of the lever 22, the spool 25
is pressed downward, the valve body in the on-off valve body 26 operates, and the exhaust pipe 10 is opened. As the exhaust pipe 10 passes and closes to the atmosphere, the air inside the inner bag body 1 is exhausted, the inner bag body 1 gradually contracts, and the weir body x continues to fall down. Furthermore, when the water level on the upstream side C decreases and reaches the water level when the weir is completely collapsed, that is, the height of the upstream minimum water level 15, the pipe end 14a of the water suction pipe 14 appears above the water surface in the float chamber 12, Air enters from there, passes through the water suction pipe 14, and then passes through the water pipe 4.
reaches the top of the siffon part 6 and the siffon action stops. In this way, the suction of water stops and the weir body X stops collapsing. When the floodwaters disappear and the water level on the upstream side C falls, air is pressurized into the inner bag body 1 and expanded, as described above, and the weir body X stops collapsing. Stand up your body to some extent.

After this, the inner bag body 1 expanded due to the rise in the water level of the river A plays the role of a float, and the water from the river A naturally flows into the outer bag body 1 through the water pipe 4, the venturi part 5, and the transport pipe 7. The weir body X will stand up and store water. As is clear from the above description, when standing up, the present invention supplies air to the inner bag 1 and uses its float action to introduce upstream river water into the outer bag 2. As the water supplied to the outer bag body 2 can be directly used as a relatively low-pressure water flow flowing through the river channel, there is no need to separately provide a high-pressure pump or a reservoir for water pressure. This makes the equipment simpler. Furthermore, the height of the top surface (weir height) of the outer bag 2 can be kept almost constant over its entire length by resisting the water flow due to the action of the beams of the inner bag 1 containing pressurized air.

[Brief explanation of drawings]

FIG. 1 is an overall sketch showing the state in which the weir body of a weir according to an embodiment of the present invention stands up and stores water; FIG. 2 is a cross-sectional view in the flow direction showing the circuit configuration of the weir shown in FIG. 1; Fig. 3 is a front view schematically showing the on-off valve, Fig. 4 shows the top shape according to the present invention, as seen from the downstream side of the weir, and Fig. 5 shows the structure without an inner bag body. FIG. 4 is a view of a portion corresponding to FIG. 4 when water and air are introduced into the outer bag. 1... Inner bag body, 2... Outer bag body "A...
River, D...River bed, X...Weir body. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5

Claims (1)

[Claims] 1. An outer bag is installed on the river bed in the direction of crossing the river channel, the outer bag is communicated with the upstream river, and the inner bag is housed within the outer bag along its entire length, and the inner bag is is connected to an air injection device for pressurizing air into the inner bag, and inflates it by pressurizing air into the inner bag.The buoyancy of the inner bag causes upstream river water to flow into the outer bag. A weir, characterized in that it is provided so that the outer bag body is expanded and erected by introducing a.