EFFLUENT FILTRATION TANK

• US 20100270220A1
• Filed: 12/05/2008
• Published: 10/28/2010
• Est. Priority Date: 12/07/2007
• Status: Active Grant

• Current Assignee: The MAYA Group Incorporated
• Original Assignee: The MAYA Group Incorporated
• Inventors: Juhere, Yannick
• Granted Patent: US 8,851,317 B2
• Time in Patent Office: Days
• US Class Current: 210/170.80
• CPC Class Codes: B65D 88/06 cylindrical B65D88/12 takes precedence
• CPC Class Codes: B65D 88/76 for use underground manholes, inspection openings, covers therefor B65D90/105; special vessels for collecting or storing rain-water for use in the household E03B3/03; cesspools E03F11/00

Abstract

The present invention relates to a filtration tank intended to be buried and for containing wastewater in particular, the tank (100) comprising a casing (110) having an upper part (200) and a lower part (300), the tank being provided internally with a means for reinforcing the structure of the casing (110) so that it can withstand the pressure exerted by the surrounding material when the tank (100) is buried and is not completely filled.

According to the invention, the reinforcing means (600, 600′) comprises voussoirs (610, 610′) bearing against the upper part (200) and in that the tank (100) incorporates means (650d, 670) for absorbing the supporting forces of the voussoirs (610, 610′) so as to transfer said forces onto the bottom (310) of said tank.

A tank is thus obtained which withstands being buried without deforming even though it may be only partially filled.

Claims

1. ) Tank (100) intended to be buried and for containing wastewater in particular, the tank (100) comprising a casing (110) having an upper part (200) and a lower part (300), the tank being provided internally with a means for reinforcing the structure of the casing (110) so that it can withstand the pressure exerted by the surrounding material when the tank (100) is buried and is not completely filled, characterised in that the reinforcing means (600, 600′

) comprises voussoirs (610, 610′

) bearing against the upper part (200) and in that the tank (100) incorporates means (650d, 670) for absorbing the supporting forces of the voussoirs (610, 610′

) so as to transfer said forces onto the bottom (310) of said tank.

2. ) Tank (100) according to claim 1, characterised in that each voussoir (610, 610′

) comprises a wall (611) in the shape of an arch portion capable of mating internally with a rounded wall (204) of the upper part (200) and in that the means for absorbing the forces consist of bars (650d) and tubes (670).

3. ) Tank (100) according to claim 1, characterised in that a gap (I) separates the upper part (200) and the lower part (300), the reinforcing means (600) comprising wedges (630), the voussoirs (610) and the wedges (630) being provided respectively with lugs (613, 633) which are inserted in the gap (I), at least some of the voussoirs (610) and wedges (630) being connected via connecting bars (650a, 650c).

4. ) Tank (100) according to claim 3, characterised in that it comprises in its bottom (310) a permeable floor (500) intended to support a means for filtering the liquid that may be introduced into said tank, the floor (500) being connected to the voussoirs (610) and to the wedges (630) via connecting bars (650).

5. ) Tank (100) according to claim 4, characterised in that the floor (500) is composed of a plurality of elements (510 and 530) placed in a juxtaposed manner on the bottom (310) and separate therefrom.

6. ) (100) according to claim 5, characterised in that the floor (500) comprises two end elements (510) placed one on each side of at least one intermediate element (530), the end element (510) being provided with a boss (515) in which there is formed a housing (516) for receiving the end of a connecting bar (650d), the intermediate element (530) being provided respectively with two bosses (535) in which there are formed two housings (536) for receiving the ends of two connecting bars (650b).

7. ) Tank (100) according to claim 3, characterised in that the wall (611) in the shape of an arch portion is surmounted by a wall in the shape of a plate (612), the large length of which is arranged perpendicular to the median plane of the wall (611) so as to support locally the rim of an access opening (206) of the tank (100), the wall (611) being prolonged, opposite the plate (612) and in its dorsal part, by a lug (613) able to be inserted in the gap (I) provided between the upper part (200) and the lower part (300) of the casing (110), a first housing (614) being formed in the wall (611), through its inner face, facing horizontally, so as to receive an end of a connecting bar (650a), a second housing (615) being formed in the wall (611), through its inner face, facing downwards, so as to receive an end of another connecting bar (650b).

8. ) Tank (100) according to claim 3, characterised in that each wedge (630) consists of a block delimited on one side by two lateral facets (631a, 631b) and one bottom facet (632) which is intended to face downwards, and delimited on the other side by a lug (633) able to be inserted in the gap (I) provided between the upper part (200) and the lower part (300) of the casing (110), two housings (634a, 634b) being formed respectively in the two lateral facets (631a and 631b) so as to receive an end of a connecting bar (650c), a third housing (635) being formed in the bottom facet (632) so as to receive an end of a third connecting bar (650d).

9. ) Tank (100) according to claim 6, characterised in that the housings (536) formed in the floor element (530) and the second housing (615) formed in the voussoir (610) are connected respectively to vents (538 and 618) which open outwards, the corresponding connecting bars (650) being hollow so that the part located below the floor can be ventilated.

10. ) Tank (100) according to claim 9, characterised in that the housing (516) formed in the floor element (510) is connected to a vent (518) which opens outwards, and in that the connecting bar (650d) between the floor element (510) and the wedge (630) and the connecting bars (650c) between the wedge (630) and the voussoir (610) are hollow, the housings (634a, 634b, 635) formed in the wedge (630) opening outwards.

11. ) Tank (100) according to claim 3, characterised in that bridges (P) are formed locally in the gap (I) between the upper part (200) and the lower part (300) so as to reinforce the connection thereof and to laterally wedge the voussoirs (610) and the wedges (630).

12. ) Tank (100) according to claim 1, characterised in that it is provided with an external peripheral belt (400) intended to form a rigid connecting structure between the two parts (200, 300).

13. ) Tank (100) according to claim 12, characterised in that the upper part (200), the lower part (300) and the belt (400) consist of one and the same continuous wall.

14. ) Tank (100) according to claim 12 or 13, characterised in that the belt (400) is composed of a first semicircular loop (401) which prolongs the wall of the upper part (200), a short straight portion (402) which is prolonged by a second, larger semicircular loop (403), a straight portion (404), another semicircular loop (405), another short straight portion (406) which is prolonged by a fourth semicircular loop (407) which is connected to the wall of the lower part (300), the first loop (401) and the fourth loop (407) being separate so as to form the gap (I) between the two parts (200, 300).

15. ) Tank (100) according to claim 1, characterised in that the reinforcing means (600′

) comprises posts (660) secured by their ends in housings (662) respectively formed in the upper wall (202) of the tank (100) and in its bottom (310).

16. ) Tank (100) according to claim 15, characterised in that the reinforcing means (600′

) comprises a beam (700) secured to two opposite sides of the tank.

17. ) Tank (100) according to claim 16, characterised in that a plate (720) protrudes downwards so as to be able to bear against the bottom (310) of the tank in order to reinforce the structure thereof and to delimit two compartments in which two volumes of the filtration means can be placed, posts (660) protrude from the beam (700) in a direction opposite to the plate (720) and the free ends of which are fixed to the upper wall (202) so that the beam (700) can join the upper wall (202) and the bottom (310) of the tank (100) in order to make the latter more rigid.

18. ) Tank (100) according to claim 2, characterised in that each voussoir (610′

) comprises two rectilinear profiles (616) butted against the wall in the shape of an arch portion (611).

19. ) Tank (100) according to claim 1, characterised in that it is provided with an outlet orifice (330) intended for evacuating the treated effluent to an authorised outfall.

20. ) Tank (100) according to claim 1, characterised in that the bottom (310) is perforated by a plurality of passages (313) so as to enable the effluent to infiltrate, by gravity, the ground on which the tank rests.

21. ) Tank (100) according to claim 20, characterised in that the bottom (310) consists of a component attached to the tank.

22. ) Tank (100) according to claim 1, characterised in that the casing (110) is made by a rotational moulding method.

23. ) Tank (100) according to claim 5, characterised in that the floor elements (510, 530), the voussoirs (610), the wedges (630) and the connecting bars (650) are made by a rotational moulding method.

24. ) Tank (100) according to claim 23, characterised in that the rotational moulding method uses a starting material capable of forming a polyethylene foam.