RU2465398C1 - Device of automatic action to wash drain of low-head soil dams - Google Patents

Abstract

FIELD: construction.

SUBSTANCE: arrangement of a low-head soil dam 5 comprises a horizontal water-intake filtration tower 1, placed in the area of periodical forcing of an upper reach 2 level. The filtration tower 1 comprises a case 3 and a filtration filling 4. The filtration tower 1 via a check valve 6 provides for filling of an accumulating reservoir 7 with water in the period of high levels of the upper reach 2. The accumulating reservoir 7 is placed in the upper wedge of the soil dam 5 upstream the antifiltration element 12. The accumulating reservoir 7 is equipped with an inspection pit 8 and a float valve 9. A self-flow water conduit 11 is connected to the inspection pit 8 of the washed drain 14. The self-flow water conduit 11 has antifiltration membranes 13 in the area of crossing of the antifiltration element 12 of the soil dam 5. As the actuation level 10 is achieved, the valve 9 actuates 9 and discharges water along the self-flow water conduit 11 into the inspection pit of the washed drain 14.

EFFECT: higher efficiency of drainage structures operation and their service life.

1 dwg

Description

The invention relates to the field of hydraulic engineering and can be used to clean the drainage from deposits.

Known manhole (special flush well), part of the design of the drainage used for their hydraulic flushing (TSN EK-97 MO. Rationing and standardization. Territorial building codes. Technical rules and norms for the construction, operation and monitoring of the construction of sewage systems of low-rise buildings on the territory of the Moscow Region, approved by the Decree of the Government of the Moscow Region dated 03.30.98 No. 28/9). The manhole is filled with water from some source (water supply, pond, storm or drainage water, water trucks, etc.) and then quickly emptied into the washable drainage network. To do this, the drainage pipe leaving the inspection well is equipped with a special valve, flap or shutter, which, after filling the well, is opened (removed). Special washing wells for ease of emptying are equipped with lever valves that open and close from the ground, or special siphons that automatically empty the well after filling it. In one gulp, water discharged into the drainage erodes and transports deposits to the place of discharge from the drainage system.

The disadvantage of the analogue is that such devices, depending on their design, often require the organization of additional work on cleaning the drainage of the hydraulic structure, attracting people and mechanisms, delivering water to create a wash flow from any sources or having enough water in the drainage itself to form wash flow.

Known self-washing drainage of periodic action, consisting of a water storage tank for accumulating washing filtration water, equipped with a manhole and connected by an automatic drainage device to a manhole of the washing drainage, designed for hydraulic washing of the drainage of the accumulated filtration water located in the body of the ground dam in the season of increasing the ground dam in the season of the increase in the ground dam in the area the surface of the depression, but outside the filtration zone of iron and manganese-containing waters, having along its perimeter, water-intake openings for collecting filtration water, protected from siltation by a reverse filter and protective filtering material (PM No. 90806, published on January 20, 2010). When the water in the storage tank reaches a certain level, a siphon is triggered, through which the storage tank is quickly emptied into the inspection drainage well and the drain is hydraulically flushed to remove accumulated deposits along the washed drainage paths.

According to the greatest number of similar features and the result achieved when using this technical solution is selected as a prototype.

The disadvantage of the prototype is the low maintainability of the inverse filter of the storage tank. In addition, in the case of silting of the upper slope of the soil dam, an unpredictable decrease in the level of the depression surface in the dam body in the area where the storage tank is located is possible. In this case, the tank is in the anhydrous zone and its filling due to filtration water becomes impossible.

The technical result, to which the claimed invention is directed, consists in increasing the efficiency of drainage structures and their service life under conditions of deposition in the drainage cavity of soil and silt particles, as well as insoluble compounds of iron and manganese.

To achieve the specified technical result, in the automatic action device for flushing the drainage of low-pressure soil dams, which includes an accumulating tank equipped with an inspection well, a gravity water conduit is connected to the inspection well of the washed drainage, having antifiltration diaphragms in the zone of intersection of the antifiltration element of the low-pressure soil dam and automatically switching on the float valve located in the storage tank located in the riding wedge low a pressure head soil dam in front of an anti-filtration element and a horizontal water intake filtration column, connected in the zone of periodic forcing of the head water level, consisting of a sleeve and backfill with predetermined filtration properties and providing filling of the storage tank with water during the level rise upstream.

Distinctive features of the proposed design of drainage flushing from the above prototype is the connection of a gravity water conduit to the accumulating tank through the float valve and the presence of a check valve in the interface node of the horizontal water intake filter column with the storage tank, the device of a horizontal water intake filter column in the zone of periodic forcing of the upstream level.

Due to the presence of these signs during operation of the proposed device, the non-return valve in the interface node of the intake filter column with the storage tank prevents the outflow of water from the storage tank when the level in the reservoir decreases until the discharge level in the tank is reached. The dynamics of the upstream level for a hydraulic structure is adopted at the design stage (maximum UVB _force and minimum UVB _min acceptable levels, levels of probable security), which allows you to determine the location of the intake filter column, its geometric and filtration characteristics, as well as the parameters of the storage tank, based of the required drainage flushing frequency. The equipment of the storage tank with a float valve provides automatic drainage flushing, which does not require the involvement of additional people and mechanisms. When the water in the storage tank reaches a certain level, the float valve is activated, there is a quick emptying of the storage tank through a gravity conduit into the inspection drainage well and hydraulic flushing of the drainage. Moreover, the washing frequency ensures removal of mechanical or chemogenic deposits from the washed drainage already at the primary stage of their formation, when they are still in the form of loose plastic formations. Water is supplied to the storage tank through a water intake filter column, which is a filter bed with a given water permeability, placed in a sleeve (for example, in a metal or reinforced concrete pipe). One end of the intake filtration column goes into the upper pool of the low-pressure soil dam, the other is connected to the storage tank through a check valve, which prevents the outflow of water from the storage tank to the upper pool in the event of a decrease in the reservoir level until the discharge level in the tank is reached.

The proposed automatic action device for flushing the drainage of low-pressure soil dams has limitations associated with the difficulty of dumping flushing water through a gravity water conduit from high elevations. In this case, the equipment of a gravity water conduit with additional vertical wells is required, which will significantly reduce the technical and economic indicators of the design and worsen the quality of the hydraulic flushing of the drainage. Therefore, this device can only be used on low-pressure soil dams with a pressure of up to 15 m.

The proposed device is illustrated in the drawing, which shows a diagram of an automatic device for flushing the drainage of low-pressure soil dams.

The automatic action device for washing the drainage contains a horizontal intake filter column 1 located in the periodically forcing zone of the upstream side 2, consisting of a sleeve 3 and a filter backfill 4, supplying water from the upstream side 2 of the low-pressure soil dam 5 through the check valve 6 to the storage tank 7 equipped with a manhole 8 and a float valve 9, triggered upon reaching run-off level 10 and discharging water through a gravity water conduit 11, equipped in the intersection zone otivofiltration element of the dam 12 with antifiltration diaphragms 13, in the inspection well of the washed drainage 14.

The automatic device for flushing the drainage of low-pressure soil dams works as follows.

When the level of the downstream 2 increases, the water through the horizontal intake filter column 1 through the check valve 6 enters the accumulation tank 7, where, when the level of discharge 10 is reached, the float valve 9 is activated and the water is automatically discharged through the gravity water conduit 11 into the inspection well of the washed drainage 14, providing it hydraulic flushing with removal of accumulated deposits along the washed drainage ducts 14. Filtering strength of the anti-filtration element 12 low-pressure soil dam 5 both ensures, protivofiltratcionnymi diaphragms 13. The accumulation of water in the storage tank 7 in the case of lowering the upper pool 2 until it reaches the level of drawdown 10 in the storage tank 7 the check valve 6 is provided.

The proposed automatic action device for washing the drainage of low-pressure soil dams can significantly increase the drainage service life, reduce the cost of its operation and increase the efficiency of drainage structures by preventing siltation by soil and silt particles, as well as insoluble compounds of iron and manganese.

Claims (1)

Automatic action device for flushing the drainage of low-pressure soil dams, including an accumulating tank equipped with an inspection well, characterized in that a gravity water conduit is connected to the inspection well of the washed drainage, having antifiltration diaphragms at the intersection of the antifiltration element of the earth dam and automatically switched on by a float valve located in the float valve located in the containers located in the upper wedge of low-pressure soil dam in front of the antifil a horizontal filtration column, coupled through a check valve with an upper head of the dam, arranged in the zone of periodically forcing the level of the upper head, consisting of a sleeve and backfill with the specified filtration properties and ensuring that the storage tank is filled with water during the period when the upper head levels rise.