SU636321A1 - Hydraulic engineering structure gate - Google Patents

Description

I

The invention relates to hydraulic engineering and can be used to block the culvert, mainly in retaining structures arranged on the canals of the reclamation systems of the valley zone, the main purpose of which is to provide a command level before the outlets of the outlets at minimum costs and free passage of flood expenses.

To block the openings of the retaining structures, the well-known valve gates are used, including a panel with a horizontal axis of rotation installed in the flybet of the building ij. The control of such gates is carried out by means of additional devices: winches, manual actuators, levers, etc.

The purpose of the invention is to provide automatic channel level maintenance.

For this, the superstructure is made in the form of a hollow trihedral prism

we, with two smaller facets facing the flybet in the direction of the upstream, and the larger third had two openings for filling and emptying the internal container of the valve with water or air.

For the discharge of sediments, the horizontal axis of rotation of the gate may be elevated above the structure of the structure.

To limit the rotation of the shutter, ledges are provided that are arranged within the walls of the structure.

FIG. 1 shows the proposed closure of the supporting structure, a plan view; in fig. 2 - the same, section A-A of FIG. one.

Claims (1)

The proposed closure is the main part of a conventional retaining structure, it contains a sheet having pressure faces 1 and 2 and overflow face 3 with a horizontal axis of rotation 4. The axis of rotation can be freely laid in a semi-cylindrical recess 5 of the concrete base 6-. The closure panel on the downstream side has two openings: the bottom 7 for filling and the ontake of the inner container 8 of the shutter, the top 9 for exhausting air in the process of filling the container with water. In order to limit the rotation of the gate towards the lower side, ledges 10 are provided, and in the direction of the upstream side, ledges 11 are arranged in the walls (foundations) 12 of the structure. The axis of the shutter is raised above the structure of the structure, with the lower edge of the structure and the structure of the structure forming a slit 13. The proposed mechanism is as follows. As long as there is no water in the channel or the flow in it is less than that passed by the slot 13, the shutter is lowered to its lowest position and rests on the ledges 1O. As the transit flow rate increases, the water level in the upstream increases, and a hydrostatic pressure of water arises that acts on the pressure faces 1 and 2 of the valve, causing the shutter to rotate around axis 4. At the calculated water level in the upstream, the valve is in its extreme upper position , leaning on the ledges 11, the sama creating the pressure of water in the channel and providing a command level in the upper bay above the outlets of the outlets. With a further increase in the flow of water in the channel, it overflows through walls 12, ledges 11 and overflow face 3 of the shutter located at the level of the calculated level in the upstream. The outflow occurs along the entire front of the structure, operating as a polygonal weir in terms of, formed by walls 12, ledges 11 and a rib of the gate, which has a large flow capacity. By this, the level in the upstream reaches slower than on the downstream with increasing flow in the channel. When the level in the downstream increases, water entering through the opening 7 fills the valve's capacity 8 and forces air through the opening 9. With a further increase in the water flow through the channel and the level from the bottom bay, the hydrodynamic pressure of the water on the overflow face 3 of the gate, the weight of the gate and the weight of the water in it will ensure that the shutter is lowered to the lowest position (open position) and the opening of the support structure opening. With a decrease in the transit flow of water through the supporting structure, the water level in the downstream and, consequently, the hydrodynamic pressure of water on the overflow face 3 of the gate decreases. The moment of the force of the hydrodynamic pressure of pressure on the pressure faces 1 and 2 becomes greater than the moments of force: the hydrodynamic pressure of water on face 3, the weight of the shutter and the weight of water in it, which ensures that the shutter is raised to the closed position. In this case, the internal capacity of the shutter 8 is emptied, which creates conditions for further work with minimum water levels in the upstream. The proposed gate built into the retaining structure will automatically ensure the command level above the tap holes at various channel operation modes; simple in design and operation, as it uses the hydraulic properties of the flow; allows you to get rid of extras to raise and lower the shutter; it can be used both in single-span and multi-span retaining structures. Claims of the invention Hydrotechnical shutter, including a span structure with a horizontal axis of rotation located on the flybet, characterized in that, in order to ensure automatic maintenance of the level in the channel, the span structure is made in the form of a hollow triangular prism, with two smaller faces facing the flutbet in the direction of the upstream, and on the larger face two holes are formed. Sources of information taken into account in the examination: 1. Handbook of hydraulic engineering, M., Selkhozizdat, 1955, p. 699. fig. 2629. / j . 2