DD262059A1 - DEEP FOUNTAIN WITH FILTER REMOVAL - Google Patents

Abstract

The invention relates to a deep well with filter removal, especially for Entwaesserung of opencast mines. Concentric rings of coarse gravel and filter gravel are arranged around a non-perforated jacket pipe in a well pipe, which were selectively introduced in loose shots. The pump sump is equipped only with coarse gravel, whereby coarse gravel is also deposited under the pump sump. In addition to the filter function, the accumulated water is discharged in the coarse gravel without a fall. The production is continuous with normal Schuettvorrichtungen feasible. figure

Description

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Field of application of the invention

The invention relates to a deep well with filter removal, especially for drainage of opencast mines.

Characteristic of the known state of the art

Particularly in lignite opencast mining, efficient drainage of the slope systems and the coal seams is necessary. As the depth of the drainage well increases, significant costs are incurred in the construction of the filter wells. So far, the filter wells are equipped with fittings made of clay pipes, concrete or gravel adhesive filters and perforated pipes with filter gauze.

In order to prevent a siltation of the filter by venting the water rushing into the sump, a drop filter arrangement is proposed according to DD patent 225601. According to DD patent 242249 cuffs and discharge hoses are installed in the casing pipes, so that the water-holding chambers formed and a fall of the water is prevented.

It is disadvantageous that the drop filter and drainage pipes must be arranged over the entire well level and also filter gauze is necessary. In addition, the installation in the well is very expensive.

The pumping off of the water takes place by means of UWM pumps and risers, which are inserted into the well pipe.

Object of the invention

It is the object of the invention to reduce the effort for the construction of deep wells with filter removal.

Explanation of the essence of the invention

The technical object of the invention is to develop a deep well with filter expansion, in which the filtering materials are formed only on site to a well filter.

According to the invention the object is achieved in that a concentric filter zones are provided in a poured execution in a well bore around an unperforated casing.

Coarse free-flowing filter material, with grain size of 3 to 8mm, such as grit or coarse gravel is provided directly around the casing, with an embodiment as part ring is possible. The part ring is performed over the entire jacket tube length.

Between the coarse filter material and the wall of the well bore is fine Giant-shaped filter material, arranged with a grain size of 0.6 to 2.4 mm like filter gravel. The jacket pipe consists at most in the lowest part, in the pump sump, of perforated material. Otherwise, only an opening is provided below. In the area of the pump sump concentric around the perforated casing pipe only coarse filter material is provided, which can not penetrate through the openings in the well. It is also possible to place filter gauze around the casing pipe in the pump area to prevent fine sands. If coarse gravel is also arranged underneath the pump sump, the pump sump can remain open at the bottom, from where the flow of water takes place. Above the uppermost aquifer, the jacket pipe is sealed with Rphton in a conventional manner against the atmosphere. It is advantageous to provide more than two concentric filter zones around the mandrel in order to increase the filtering effect.

The water penetrates from the aquifers into the fine filter gravel and then enters the coarse gravel zone. There it sinks, obeying gravity or by a vacuum on the coarse filter material along in the pump sump, where it is pumped out .. The coarse filter materials ensures that the groundwater easily enters the sump, but no impurities are forwarded. It is important that the water does not fall directly from the aquifer into the pump sump, but flows down along the surface of the coarse gravel. This avoids ventilation with oxygen and thus oozing.

embodiment

In a well bore 1, a pump sump 2 with filter gauze 3 is used.

Above the sump 2, which is provided laterally with openings, there is a jacket tube 4, which has no openings on the circumference. The jacket tube 4 consists of sub-segments 5, which are connected by butt connectors 6 with each other. On the wall of the well bore 1 are the horizontally deposited aquifers 7 and 8 at. To the sump 2 concentric well bore 1 is filled with coarse gravel. The coarse gravel 9 is also concentrically deposited around the casing pipe 4, wherein only a part of the well bore 1 is filled.

Between well bore 1 and coarse gravel 9 fine filter gravel 10 is selectively introduced, which also creates a concentric hollow cylinder. Below the turf sole 11 and above the uppermost aquifer 7 raw clay 12 is introduced as a seal. In the jacket tube 4 is the submersible motor pump 13 with riser 14 through which the accumulated water is pumped out of the sump 2.

Claims (5)

1. deep well with filter removal, characterized by the following features: - Rings of coarse gravel (9) with a grain size> 3 mm and fine filter gravel (10) with a grain size of 0.6 to 2.4 mm are poured concentrically around the jacket pipe (4); - The coarse gravel (9) is deposited directly around the jacket tube (4), while the more distant rings each have a lower grain size. 2. Tiefbrunnen according to claim 1, characterized by more than two concentric rings of coarse gravel (9) or fine filter gravel (10). 3. deep well according to claim 1, characterized in that only coarse gravel (9) is provided in the region of the pump sump (2). 4. Tiefbrunnen according to claim 1, characterized in that the jacket tube (4) in the region of the pump sump (2) is perforated and with filter gauze (3) is wrapped. 5. Tiefbrunnen according to claim 1, characterized in that the jacket tube (4) in the pump sump (2) is open at the bottom and below the sump (2) coarse gravel (9) is arranged.