Patent EA-000911-B1 (EA)
Title: Method for producing a filter bottom for water treatment
Inventor: PERRIN DIDIER
IPC: B01D24/22
Filed: 1998-01-27
Abstract: 1. A method for producing a filter bottom for water treatment comprising a support structure (10) in a container, said support structure consisting of beams or posts resting on container bottom and supporting a slab (9) provided with a plurality of openings for receiving screen water filters (11), wherein said support structure and slab are produced by casting concrete in situ , in the filter casing, the permanent form is formed from the juxtaposition of the supporting structure and slab, characterized in that the casing which is left in the structure is made of identical elements, these elements being the same as the elements used throughout the application for the elements (4) and therefor the final permanent form is the result of assembling such elements , wherein these elements are maintained in the given configuration using fixation means (17). 2. A method as claimed in claim 1, characterized in that concrete is cast in one step. 3. A method as claimed in claim 1, characterized in that concrete is cast in two steps. 4. A method as claimed in any one of the preceding claims, characterized in that comprises the following successive steps: producing a filter container (1), assembling reinforcement (6) the beams frame of the supporting filter structure, juxtapositioning of identical elements placed on the bottom of the casing and fixation of said elements of the casing (4) which is left in the application, mounting rings or clamps (7) protected by caps on casing elements, which is left in the application in points provided for receiving screen water filters, assembling reinforcement frame of the slab (9) upper portion, concrete casting in situ in the filter container within the casing which is left in the application removing safety caps from the rings (7) and mounting screen water filters (11) on said rings. 5. A casing element left in the application, characterized in that said element is produced from plastic, steel or composite material having a configuration, providing by placing those which are identical side by side a plurality of such elements on carefully levelled horizontal bottom to obtain the casing where concrete is cast to form the structure of beams and posts supporting the slab (9). 6. A casing element as claimed in claim 5, characterized in that said element is 1-17 mm thick, preferably 3-7 mm. 7. A casing element as claimed in claim 5 or 6, characterized in that said element is 100-700 mm high, preferably 120-250 mm. 8. A casing element as claimed in claim 5 to 7, characterized in that said element is 300-1300 mm wide, preferably 450-700 mm. 9. A casing element as claimed in claim 5 to 8, characterized in that said element is from 2 to 7 m long. 10. A casing element as claimed in claim 5 to 9, characterized in that said element has such a configuration at which a pressure applied to its lateral walls in the process of concrete casting create a convexity in its upper portion to compensate, at least partially, a deflection caused by concrete weight. 11. A casing element as claimed in claim 5 to 10, characterized in that the walls of said element has such a configuration allowing to minimize the pressure loss of the liquid flow circulating in the filter. 12. A casing element as claimed in claim 11, characterized in that the walls of said element have rigidity ribs (15, 15<1>) to secure the casing rigidity in horizontal and vertical planes. 13. A casing element as claimed in claim 5 to 12, characterized in that the side walls of said element have a curvature of greater radius. 14. A casing element as claimed in claim 5 to 13, characterized in that said element comprise in its upper portion a plurality of apertures (16) to receive rings and clamps (7), to which the screen water filters are fixed, while in the bottom portion of the element fixation holes are provided to secure a rigid fixation with a cushion of the filter bottom. 15. A filter for water treatment, characterized in that comprises a bottom produced by a method as claimed in any one claim 1 to 4 using the casing elements left in the application according to any one of claims 5 to 14.