JP3065827U - Rubber weir overpressure prevention device - Google Patents

Abstract

(57) [Abstract] [Problem] To prevent the rise of the internal pressure due to the rise in the temperature of the rubber weir laid across the river and the upstream and downstream and the rise in the water level on the upstream side, and to ensure the safety of the rubber weir A device for preventing overpressure of a rubber weir is provided. A water tank (3) communicating with an inlet pipe (18) is provided on an upstream side (8) of a river, and a water seal container (4) is arranged on a revetment (12). The water tank 3 and the water-sealed container 4 communicate with each other by a relief pipe 6 arranged along the vertical direction. Further, the rubber weir 2 and the water seal container 4 are communicated by an internal pressure detection pipe 7. The internal pressure of the rubber weir 2 is balanced with the water height (H1 + H2) of the water tank 3 and the water-sealed container 4, and even when the temperature rises or the water level rises, these pressures are balanced to prevent such overpressure.

Description

[Detailed description of the invention]

[0001]

[Technical field to which the invention belongs]

 The present invention relates to an overpressure prevention device for preventing an excessive rise in the internal pressure of a rubber weir laid across a river and ensuring safety, and in particular, an overpressure prevention device for a rubber weir that can simplify construction. About.

[0002]

[Prior art]

 As shown in FIG. 1 and the like, the river is provided with a rubber weir 2 which crosses the river channel and separates the upstream and downstream sides so as to form an appropriate weir height on the upstream side. The rubber weir 2 is made of a flexible bag, and falls and stands when air flows in and out of the blower 14. The shape of the rubber weir 2 and its internal pressure are determined to maintain a desired weir height. However, the pressing force applied to the rubber weir 2 due to a rise in the temperature of the rubber weir 2 and a rise in the water level on the upstream side is increased. The internal pressure may rise excessively. If the rubber dam is not provided with a preventive means for preventing the rise, the rubber weir 2 may expand more than necessary, and the rubber weir may be damaged, and the rubber weir is fixed to the riverbed. There is a problem that excessive force acts on the means and damages or loosens it. For this reason, means for preventing overpressure of rubber dams have been employed.

[0003]

[Problems to be solved by the invention]

 That is, as a conventional overpressure preventing means, for example, an "overpressure preventing device" disclosed in Japanese Patent Publication No. 62-9692 can be mentioned. According to this known technique, one end of a weir overpressure prevention pipe is connected to a wrapper (corresponding to the rubber weir) filled with air, and the other end is inserted into a tall water-sealed pipe, and the bottom is inserted into the bottom. An opening technique is disclosed. Also, a technique has been disclosed in which a plurality of water-sealed tubes are juxtaposed in order to solve the problem of the height of the water-sealed tubes being too high. The installation of the water-seal tube prevents the internal pressure of the wrapping (rubber weir) from being excessively increased, but it is necessary to prepare a separate tall or a plurality of water-seal containers as described above. However, there is a problem that securing and installing the installation area becomes complicated and equipment costs are increased. This document does not disclose any measures to be taken when the upstream weir height rises. On the other hand, in addition to the above-mentioned known technologies, there are known technologies such as “Safety device for rubber weir” in Japanese Utility Model Application Laid-Open No. Sho 56-110127 and “Pressure Safety Device for Water Weir” in Japanese Utility Model Application No. 48-17075. All of these require separate tubular tanks, and have almost the same problems as the above-mentioned known technology.

The present invention has been devised in view of the above circumstances, and can reliably prevent an overpressure due to an increase in the internal pressure of a rubber weir and an increase in the water level on the upstream side, and can relatively easily perform the installation. It is an object of the present invention to provide a rubber weir overpressure prevention device capable of reducing costs.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention consists of a flexible bag that lays down and rises due to the inflow and outflow of air. An overpressure prevention device for preventing water pressure, comprising: a water tank that is recessed on the upstream side of a river and communicates with the upstream side via a water pipe to maintain the river level on the upstream side; A watertight container disposed above the water tank and filled with water to an appropriate height therein to form an air reservoir at the top, and a watertight container formed of the watertight container and the water tank. A relief pipe extending vertically between the relief pipe and having an upper end opened to the air reservoir chamber and a lower end sunk into the water tank and opened, and one end communicating with the rubber weir and the other end being the water seal container. Rise up to a position higher than the air reservoir, and then It constitutes a overpressure prevention apparatus of a rubber dam to provide a pressure sensing tube connected to part. Further, the internal pressure detecting pipe is formed of a branch pipe branched from a supply / exhaust pipe installed between the blower side and the rubber weir to allow air to flow into and out of the rubber weir. In addition, a control unit is provided for controlling the opening of the exhaust valve of the blower in order to lower the water level by lowering the rubber weir when the water level on the upstream side of the river reaches a predetermined level. .

In the case where the internal pressure is normal, the water height of (H 1 + H 2) mmAq obtained by adding the water height (H 2) and (H 1) of the water tank and the sealed air and the internal pressure of the rubber weir are balanced. When the internal pressure of the rubber weir rises due to a rise in temperature or a rise in the water level on the upstream side, the water height (H 2) in the water tank rises to (H3) and (H4) accordingly. Its presence prevents the rise of the contents of the rubber weir. Also, when the water level rise on the upstream side exceeds a certain level, the control unit that engages with the exhaust valve of the blower operates to lower the internal pressure of the rubber weir to make it fall down to ensure safety. In addition, the bottom of the water tank is recessed on the upstream side, and the bottom height may be relatively shallow, making construction simple. In addition, a single water-seal container may be used and no special tank is required.

[0007]

[Embodiment of the invention]

 Hereinafter, an embodiment of an overpressure prevention device for a rubber weir of the present invention will be described in detail with reference to the drawings. First, the rubber weir laid across the river will be briefly described. The rubber weir 2 is made of a non-breathable, water-impermeable cloth or the like covered with a synthetic resin or rubber, and is made of a flexible bag forming an internal space. The rubber weir 2 has its bottom fixed to the bottom of the river by fixing means (not shown) and is laid across the river channel. As shown in FIG. 1, a blower 14 is connected to the rubber weir 2 having the above structure via a supply / exhaust pipe 15. The blower 14 is installed on the revetment 12. Further, the blower 14 is provided with an exhaust valve 16 and a control unit 19 for adjusting the opening of the exhaust valve as shown in FIG. When air is introduced into the rubber weir 2 from the blower 14, the rubber weir 2 rises and assumes a predetermined standing shape. As a result, the river is divided into an upstream side 8 and a downstream side 9, and a weir 17 having a predetermined weir height is formed on the upstream side 8. Conversely, when the exhaust valve 16 is opened and the air in the rubber weir 2 is exhausted, the rubber weir 2 falls down and the weir 17 disappears, and the upstream side 8 and the downstream side 9 become almost the same level.

Next, the structure of the overpressure prevention device 1 of the present invention will be described with reference to FIG. First, a recessed water tank 3 is pierced on the upstream side 8 of the river as shown. The water tank 3 is formed shallower than the bottom 10 of the river and is relatively shallow. One end of the introduction pipe 18 communicates with the water tank 3, and the other end of the introduction pipe 18 enters and communicates with the water on the upstream side 8. Therefore, water 11 having the same water level as the weir height on the upstream side 8 is stored in the water tank 3.

On the revetment 12, a water sealed container 4, which is a closed box, is provided. The water 13 is filled in the water-sealed container 4, and an air reservoir 5 is formed above the water 13. The relief pipe 6 is formed of a pipe having both ends opened, and is installed vertically between the water seal container 4 and the water tank 3. The upper end of the relief pipe 6 opens into the above-mentioned air reservoir 5, and the lower end sinks into the water tank 3 and opens.

On the other hand, an internal pressure detecting pipe 7 is provided between the rubber weir 2 and the water seal container 4 so as to communicate with the both. The internal pressure detecting pipe 7 is buried in the ground at the bottom of the river along the substantially horizontal direction and one end of the first horizontal pipe 7a is connected to the rubber weir 2, and the first horizontal pipe 7a is connected to the first horizontal pipe 7a. The first vertical tube 7b rises vertically from the other end, and the second vertical tube 7c descends vertically from the rising upper end of the vertical tube 7b. The lower end of the second vertical tube 7c The connected second horizontal pipe 7 d is connected to the lower end side of the water seal container 4 and communicates with the water seal container 4. Note that the upper ends of the first vertical pipe 7b and the second vertical pipe 7c are disposed above the upper end of the water seal container 4.

As shown in FIG. 1, in the upright state of the rubber weir 2 in the normal state, water is stored in the water tank 3 and the water seal container 4 in the state shown in the drawing, and the internal pressure of the rubber weir 2 is balanced. doing. That is, in the internal pressure detection pipe 7, water exists only in the second horizontal pipe 7d, and water has entered the lower end side of the relief pipe 6. That is, as shown in the figure, water is maintained in a state where water has invaded to a position lower by the height H1 than the level of the weir height on the upstream side 8. As described above, in the normal internal pressure state of the rubber weir 2, the internal pressure becomes a value corresponding to the water height of (H1 + H2) mmAq, and is balanced in the illustrated state. In this state, when the rubber weir 2 is evacuated and the rubber weir 2 is brought into the down state, the pressure in the internal pressure detecting pipe 7 decreases, so that water is supplied to the second vertical pipe 7c of the internal pressure detecting pipe 7. Although the water 13 in the sealed container 4 enters, the water does not flow into the rubber weir 2 because the total height of the second vertical pipe 7c is higher than the height of the water sealed container 4. The water 11 in the water tank 3 is discharged to the upstream side 8 via the water pipe 18 because the rubber weir 2 falls down.

FIG. 2 shows the operation of the overpressure prevention device 1 when the temperature rises. The internal pressure in the rubber weir 2 rises due to the rise in temperature. For this reason, the pressure in the rubber weir 2 is applied to the water seal container 4 via the internal pressure detection pipe 7, but the water height H 1 of the water 13 in the water seal container 4 hardly changes, and Pressure rises. As a result, the pressure in the relief pipe 6 rises and presses the water 11 on the water tank 3 side below the relief pipe 6. However, since the water tank 3 communicates with the upstream side 8 via the inlet pipe 18, the water level in the water tank 3 is balanced at the water level H3 in a state where the water below the relief pipe 6 has run out, and the water level is higher than that. No pressure rise occurs. That is, in this case, the pressure rises to (H1 + H3) mmAq, but there is no further increase, and the pressure in the rubber weir 3 is balanced by (H1 + H3) mmAq irrespective of the temperature rise.

FIG. 3 illustrates an overpressure preventing action when the water level on the upstream side 8 rises. When the water level rises from the bottom 10 of the river to H5 as shown in the figure, the rubber weir 2 is pressed by the rise in the water level and its internal pressure rises. As a result, pressure is applied to the water-seal container 4 via the internal pressure detection pipe 7 in the same manner as shown in FIG. 2, but the water height H1 of the water-seal container 4 hardly changes and the water height of the water tank 3 is changed. Changes. Since the water level of the upstream side 8 rises to H5, the water level of the water tank 3 communicating with the upstream side 8 by the introduction pipe 18 rises. In this case as well, the pressing force from the air reservoir 5 acts on the water in the water tank 3 as in the case of FIG. As a result, the water height on the water tank 3 side becomes H4> H3, and the internal pressure of the rubber weir 2 rises to a value of (H1 + H4) mmAq as a whole. Since the water level on the upstream side may be higher than H5, the limit of the rise of the water level is set to H5 in the present invention to prevent the water level from rising further. The value of H5 is determined appropriately in consideration of the strength of the rubber weir 2 and the state of the river. When the water level on the upstream side 8 exceeds H5, the control unit 19 is operated, the exhaust valve 16 is opened, and the rubber weir 2 is operated on the falling side. This prevents an abnormal rise in the water level on the upstream side 8. As described above, it is possible to prevent the internal pressure of the rubber weir 2 from excessively increasing even when the temperature rises or the water level rises on the upstream side 8.

On the other hand, even when the air temperature decreases or the water level on the upstream side 8 decreases, the internal pressure in the rubber weir 2 is kept in balance with the water level in the water seal container 4 and the water tank 3. The internal pressure required to maintain the weir 2 in the upright state is maintained.

FIG. 4 shows an overpressure prevention device 1a according to another embodiment of the present invention. The overpressure prevention device 1a according to the present embodiment employs a branch pipe 20 instead of the internal pressure detection pipe 7 in the above overpressure prevention device 1. In this embodiment, as in the other examples, the blower 14 is disposed at a position lower than the water seal container 4, but the branch pipe 20 branches off from the supply / exhaust pipe 15 of the blower 14. Once connected to the lower end of the water sealing container 4 via a position higher than the water sealing container 4. Since the internal pressure of the rubber weir 2 and its change are transmitted to the water seal container 4 via the branch pipe 20, it is possible to perform the same overpressure prevention function as the overpressure prevention device 1 in the above embodiment. it can.

In the case of the overpressure prevention devices 1 and 1 a according to the present invention, the water tank 3 is a recess formed in the upstream side 8 and is relatively shallow, and communicates with the upstream side 8 by the introduction pipe 18. The construction is simple and easy. Further, the water-seal container 4 may be a single one, and it is not necessary to use a special structure. From the above structure, the overpressure prevention devices 1 and 1a according to the present invention have a simpler structure than those of the related art, are easy to construct, and can reduce the equipment cost.

[0017]

[Effect of the invention]

 According to the device for preventing overpressure of the rubber weir of the present invention, it is possible to reliably prevent the internal pressure of the rubber weir from being excessively increased irrespective of a rise in temperature or a rise in water level, and to implement it relatively simply and inexpensively. Can be.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an overpressure prevention device of the present invention.

FIG. 2 is an explanatory diagram for explaining the operation of the overpressure prevention device of the present invention when the temperature of the rubber weir rises.

FIG. 3 is an explanatory diagram for explaining the operation of the rubber weir overpressure prevention device of the present invention when the water level on the upstream side rises.

FIG. 4 is a configuration diagram showing another embodiment of the overpressure prevention device for a rubber weir of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Overpressure prevention device 1a Overpressure prevention device 2 Rubber weir 3 Water tank 4 Water sealing container 5 Air reservoir 6 Relief pipe 7 Internal pressure detection pipe 7a First horizontal pipe 7b First vertical pipe 7c Second vertical pipe 7d 2 horizontal pipe 8 upstream 9 downstream 10 bottom 11 water 12 seawall 13 water 14 blower 15 supply / exhaust pipe 16 exhaust valve 17 weir 18 introduction pipe 19 control part 20 branch pipe

Claims (3)

[Utility model registration claims] 1. An overpressure prevention device for preventing a rise in the internal pressure of a rubber weir, which is made of a flexible bag body which falls down and rises by entering and exiting air and which is laid across a river and separates an upstream side and a downstream side. A water tank that is recessed on the upstream side of the river and communicates with the upstream side via a water pipe to maintain the river level on the upstream side, and is disposed above the water tank. A watertight container that is filled with water to an appropriate height and forms an air reservoir at the top thereof, and a vertically closed space between the watertight container and the water tank, A relief pipe that opens into the air reservoir and has a lower end submerged in the water tank and opens, and one end communicates with the rubber weir and the other end rises to a position higher than the air reservoir of the watertight container. And an internal pressure detection pipe connected to the lower end of the water seal container. An overpressure prevention device for a rubber dam. 2. The internal pressure detecting pipe comprises a branch pipe branched from a supply / exhaust pipe installed between a blower side and a rubber weir to allow air to flow into and out of the rubber weir. The device for preventing overpressure of a rubber weir according to claim 1. 3. A control section for controlling the opening of an exhaust valve of the blower so that the rubber weir is lowered when the water level on the upstream side of the river reaches a predetermined level to lower the water level. The device for preventing overpressure of a rubber weir according to claim 1 or 2.