CZ306148B6 - Facility for making transformation function of polders by stabilizing discharges of bottom water outlets more effective - Google Patents

Abstract

The present invention relates to a facility for making transformation function of polders by stabilizing discharges of bottom water outlets more effective, wherein the inlet throttling opening (1) is provided with in its upper section with a curved expansion and a blocking gate (2), which is connected with a level switch for closing the curved expansion of the inlet throttling opening (1) in case the level increases. The level switch consists of a float device (3), the dimensions of which are derived from a needful force for handling and movement range given by the movement of the level in the reservoir.

Description

Equipment for streamlining the transformation function of dry tanks by stabilizing the outflows of lower outlets

Field of technology

The invention relates to the regulation of flows from the lower outlets of reservoirs during a flood situation. This is the area of water management and water structures.

Prior art

Flow-through dry reservoirs, the purpose of which is to transform the flood wave and thus reduce the consequences of floods, have been used in water management for a long time. The current practice of designing dry tanks requires that the outflow from the tank does not exceed the limit value of the harmless flow in the section below the water body, until this is exceeded when transferring water through the safety overflow. Together with the fact that dry tanks are usually unattended, the above requirement leads to the design of bottom outlets without closures and in dimensions that limit the value of the maximum outflow from the tank. The current design method thus leads to premature filling of the retention space of the reservoir, because at the beginning of the flood, the lower outlet has a lower capacity than would correspond to a harmless outflow. Ultimately, the retention potential is not used.

The essence of the invention

The above-mentioned drawbacks are largely eliminated by the device for streamlining the transformation function of dry tanks by stabilizing the outlets of the lower outlets, according to the present invention. Its essence is that the inlet throttle opening is provided in its upper part with a curved extension and a barrier closure, which is connected to a level switch for closing the curved extension of the throttle opening when the level rises.

The level switch is preferably formed by a float device, the dimensions of which are derived from the force required to manipulate and the range of motion given by the movement of the level in the tank. The conversion of the movement of the float device into the movement of the shutter is preferably formed by a lever and / or a set of gears.

The barrier closure may be of the sluice or segment type and may have a straight or curved bypassed edge, preferably being housed in grooves.

In a preferred embodiment, a screen wall is located in front of the inlet orifice.

The main idea of the solution lies in the technical design of the shape of the guide throttle hole in combination with the guide barrier closure, which allows the mechanical connection of the level position with the position of the closure. The consumption curve of the entire outlet is then either constant or corresponds to the desired curve, for example for flow control in a water treatment plant. Thanks to this, it is possible to design drain devices - pipes so that from the beginning of the flood until the controllable retention space is filled, the outflow from the tank is close to the value of harmless flow under the water part, which results in significant improvement of the transformation effect of the tank. The above-mentioned shortcoming, which in principle affects all dry tanks in the Czech Republic, can be solved by the technical solution described below, which will allow the design of a sufficiently high capacity bottom outlet and closure with automatic regulation of outflow from the tank depending on the position in the tank. the drain is equal to the required value during the entire filling of the tank.

The presented technical solution can be divided into five parts, the use of which is unique for the purposes of water management. The first part is a float device, the dimensions of which are derived from what is needed

- 1 CZ 306148 B6 forces for manipulation and the range of movement given by the movement of the level in the tank. The minimum handling force, which is derived from buoyancy, respectively the minimum torque, ie the length of the arm is determined by the length of the control element, must be greater than the actual weight of the float plus the force / torque necessary to move with the cap at maximum hydrostatic and hydrodynamic stress water in the tank and materials used - the coefficient of friction, and the specific arrangement of the cap.

The second essential part is formed by the throttling hole, the shape of which is derived on the basis of the ratios of the maximum depth of water in the tank and the size of the harmless outflow. The lower part of the orifice is not covered at all during a flood and its dimensions are based on the standard design of the outlet through the orifice under pressure flow. The design parameters are then the height of the dam and the size of the harmless outflow from the waterworks. The lower part is followed by a curved extension, which is gradually blocked during the rise of the surface, which stabilizes the value of the outflow from the waterworks, regardless of the position of the surface.

The third part presents a mechanical device for converting the movement of the float, generally vertical, possibly according to the bearing - for example along a circle with a horizontal axis, to the movement of the actuated closure. In the present solution, either a lever principle with an articulated bearing of the closure or a transfer to the gear system and possibly back to the lever principle is selected for this device.

The fourth part is composed of the barrier itself. The barrier closure can be of the sluice or segment type. With regard to the shape of the throttle opening, the closure has either a straight, usual solution or a curved flowing edge.

The purpose of the construction - the fifth part of the presented solution is the safe transfer of static and dynamic loads to the substructure or to the subsoil and to keep the closure in a given position - grooves, wings. The second purpose is to prevent the ingress of sediments of unacceptable dimensions into the space of the closure, for example a sieve wall.

The main advantage of the present invention is the efficient use of the retention volume of the reservoir, which makes it possible to reduce flood damage. The solution enables a fully automatic function, without operator requirements. Another advantage is the high reliability at all water levels and the independence of energy sources, due to the mechanical interconnection. The solution is resistant to climatic phenomena.

Explanation of drawings

The device for streamlining the transformation function of dry tanks by stabilizing the outlets of the bottom outlets according to the invention is described in more detail by way of specific examples with reference to the following drawings, in which Fig. 1 is a vertical section through the center of the device. when the level is at the level of normal flows. Fig. 2 is a vertical section of the device perpendicular to the flow direction at normal flow rates. In Fig. 3 and Fig. 4, respectively, the sections are identical planes during flood flow, when the level in the tank rises and the device must limit the outflow from the waterworks.

Examples of embodiments of the invention

An exemplary device for streamlining the transformation function of dry tanks by stabilizing the outlets of lower outlets has an inlet throttle opening 1, which is provided in its upper part with a curved extension and barrier closure 2. The barrier closure 2 is connected to a level switch . The level switch is formed by a float device 3, the dimensions of which are derived from the force required to manipulate and the range of motion given by the movement of the level in the tank. Conversion of the movement of the float device 3 to the movement of the barrier

-2GB 306148 B6 of the cap 2 is formed by a lever. The barrier closure 2 is of the sluice type, has a straight bypassed edge and is accommodated in the grooves 4. A screen wall 5 is located in front of the inlet throttle opening 1.

Industrial applicability

The present invention finds application mainly on the lower outlets of dry tanks - polders, both in the construction of new water reservoirs and in the reconstruction of existing outlets. At present, in connection with flood protection, a large number of dry reservoirs of larger dimensions are being built in the Czech Republic. The application of the presented solution is in principle applicable to any of them, while the magnitude of the benefit increases both with the size of the reservoir and with decreasing ratio of the retention volume of the reservoir to the total volume of the flood wave. Another application can be found on all waterworks discharge devices, for which permanent operation is not desired and the flow control is dependent on the level position.

Claims (6)

PATENT CLAIMS Device for streamlining the transformation function of dry tanks by stabilizing the outlets of the lower outlets, characterized in that the inlet throttle opening (1) of the lower outlet of the dry tank is provided in its upper part with a curved extension and barrier valve (2) connected to the level switch for closing the curved extension of the throttle opening (1) when the level rises. Device according to claim 1, characterized in that the level switch is formed by a float device (3), the dimensions of which are derived from the force required to manipulate and the range of movement given by the movement of the level in the tank. Device according to Claim 1 or 2, characterized in that the transmission of the movement of the float device (3) to the movement of the barrier closure (2) is formed by a lever and / or a set of gears. Device according to any one of claims 1 to 3, characterized in that the barrier closure (2) is of the sluice or segment type and has a straight or curved flow edge. Device according to any one of claims 1 to 4, characterized in that the barrier closure (2) is accommodated in the grooves (4). Device according to one of Claims 1 to 5, characterized in that a screen wall (5) is arranged in front of the inlet orifice (1).