WATER TREATMENT TANK

Abstract

WATER TREATMENT TANK The invention relates to a water treatment tank (100) intended to be buried in a hole and comprising a tank (101), a bottom (102) closing the tank (101) in the lower part and intended to come against the bottom of the hole, and a plurality of feet (104), where each foot (104), is integral with the bottom (102) of the water treatment tank (100) and arranged outside said bottom (102), where each foot (104) takes the shape of an inverted T with a vertical bar (104a) of which a proximal end is integral with the bottom (102) of the water treatment tank (100) and a horizontal bar (104b) integral with a distal end of the vertical bar (104a). Fig. 1

Description

Title of the invention: WATER TREATMENT TANK Technical field

[0001] The present invention relates to a water treatment tank, in particular a lifting station, as well as a method of anchoring such a tank. STATE OF THE PRIOR ART

[0002] A water treatment tank, in particular a pumping station, is generally buried in the ground which is regularly waterlogged. To prevent the tank from deforming under the effect of hydrostatic pressure and so that the weight of the tank compensates for Archimedes' thrust, this tank is conventionally made of concrete so that it is sufficiently rigid not to deform and sufficiently heavy to remain in the bottom of the hole.

[0003] To reduce the cost of production and installation of such a tank, it is advantageous to make it from plastic by rotational molding, but then the tank may prove insufficiently rigid to avoid deformation, and too light to compensate for Archimedes' thrust. Statement of the invention

[0004] An object of the present invention is to provide a water treatment tank which is made of a relatively light material such as a plastic material such as polyethylene and which comprises means which ensure its rigidity and its solid anchoring to the ground and in particular to the bottom of a hole.

[0005] For this purpose, a water treatment tank is proposed, intended to be buried in a hole and comprising:

[0006] - a tank,

[0007] - a bottom closing the tank in the lower part and intended to come against the bottom of the hole, and

[0008] - a plurality of feet, where each foot is secured to the bottom of the treatment tank of water and arranged outside said bottom, where each foot takes the shape of an inverted T with a vertical bar of which a proximal end is secured to the bottom of the water treatment tank and a horizontal bar secured to a distal end of the vertical bar.

[0009] With such an arrangement, rigidity and anchoring to the ground are improved.

[0010] Advantageously, each horizontal bar is hollow and delimits a space and each vertical bar is made up of two walls defining between them a passage between the interior of the tank and the space of the associated horizontal bar.

[0011] Advantageously, the water treatment tank further comprises a frame arranged inside the tank, at least one anchoring element housed in the space of a bar horizontal and for each anchoring element, a connecting bar fixed between the anchoring element and the frame across the passage.

[0012] The invention also proposes a method of anchoring a water treatment tank according to one of the preceding variants, said anchoring method comprising:

[0013] - an installation step during which the water treatment tank is placed in place in a hole,

[0014] - a reinforcement step during which trellises are arranged between each horizontal bar and the bottom of the water treatment tank, and

[0015] - a sealing step during which concrete is poured onto the mesh. Brief description of the drawings

[0016] The above-mentioned features of the invention, as well as others, will appear more clearly on reading the following description of an exemplary embodiment, said description being made in relation to the attached drawings, among which:

[0017] [Fig-1] is a perspective view of a water treatment tank according to the invention,

[0018] [Fig.2] is a perspective view of detail II of [Fig. 1],

[0019] [Fig.3] is a perspective and sectional view through a vertical plane of the tank of water treatment according to the invention, and

[0020] [Fig.4] is a view along arrow IV of [Fig.3].

[0021] DETAILED DESCRIPTION OF EMBODIMENTS

[0022] In the following description, terms relating to a position are taken with reference to a water treatment tank in the position of use, i.e. as shown in Figs. 1 to 4 which show a water treatment tank 100 according to the invention.

[0023] The water treatment tank 100 is for example a water lifting tank, but any other use is possible.

[0024] The water treatment tank 100 comprises a tank 101 which is here cylindrical in shape around a vertical axis of revolution, but any other shape is possible. The tank 101 here has in the upper part an access 132 which allows access to the interior of the tank 101.

[0025] In the embodiment of the invention shown in [Fig. 1], the water treatment tank 100 comprises a hatch 130 which is hingedly mounted on the tank 101 between alternately a closed position in which the hatch 130 closes the access 132 and an open position in which the hatch 130 does not close the access 132.

[0026] The tank 101 comprises a side wall 101a forming a cylinder here and in the embodiment of the invention presented here, the side wall 101a is pierced with orifices 101b allowing the connection of pipes necessary for the use of the water treatment tank 100. The number, arrangement and shape of the orifices 101b vary depending on the destination of the water treatment tank 100.

[0027] Although the water treatment tank 100 may be placed on the ground, it is preferably buried in a hole where it can be subjected to hydrostatic pressure when the hole is in wet ground.

[0028] The water treatment tank 100 also comprises a bottom 102 which closes the tank 101 in the lower part thereof. In the embodiment of the invention presented here, the bottom 102 is generally flat because the water treatment tank 100 is cylindrical with its axis vertical, but the bottom can take other shapes. For example, the water treatment tank 100 is cylindrical with its axis horizontal, and the bottom is then the lower part of the cylinder.

[0029] In the embodiment of the invention presented here, the tank 101 and the bottom 102 are made of plastic by rotational molding but other techniques are possible.

[0030] The bottom 102 of the water treatment tank 100 is generally horizontal and comes against the bottom of the hole when the water treatment tank 100 is put in place.

[0031] The water treatment tank 100 also comprises a plurality of feet 104 which here number four distributed angularly at 90° to each other, but a different number and position are possible.

[0032] As shown more clearly in [Fig. 2], each foot 104 is integral with the bottom 102 of the water treatment tank 100 and is arranged outside said bottom 102 to bear against the bottom of the hole. Each foot 104 thus extends downwards from the bottom 102 of the water treatment tank 100.

[0033] Preferably, each foot 104 is produced at the same time as the tank 101 and the bottom 102 of the water treatment tank 100, more particularly by rotational molding. Generally, the tank 101, the bottom 102 and the feet 104 form a single-piece, single-material assembly.

[0034] Each foot 104 takes the shape of an inverted T with a vertical bar 104a having a proximal end secured to the bottom 102 of the water treatment tank 100 and a horizontal bar 104b secured to a distal end of the vertical bar 104a. When the water treatment tank 100 is in place, each vertical bar 104a extends vertically and each horizontal bar 104b extends horizontally.

[0035] The water treatment tank 100 then rests on the bottom of the hole by the horizontal bars 104b which, by their shape, provide mechanical reinforcement of the bottom 102 of the water treatment tank 100.

[0036] A method of anchoring the water treatment tank 100 then comprises:

[0037] - an installation step during which the water treatment tank 100 is placed in the hole so that the horizontal bars 104b rest on the bottom of the hole,

[0038] - a reinforcement step during which trellises 50 are arranged between each horizontal bar 104b and the bottom 102 of the water treatment tank 100, and

[0039] - a sealing step during which concrete is poured onto the meshes 50 up to the level of the bottom 102 of the water treatment tank 100.

[0040] The lattices 50 are preferably metallic and serve as reinforcement for the concrete which is subsequently poured.

[0041] The lattices 50 are arranged around the vertical bars 104a while resting on the horizontal bars 104b which project on each side of the associated vertical bar 104a. Thus, when the concrete is poured, the lattices 50 are embedded in the concrete and, after solidification, form a ballast with it. The horizontal bars 104b form reliefs which are trapped in the concrete and the lattices 50, which ensures the rigidity of the water treatment tank 100 and the anchoring of the water treatment tank 100 in the hole.

[0042] As shown in Figs. 3 and 4, in the embodiment of the invention presented here, each horizontal bar 104b is hollow, that is to say it delimits a space 112 which is bordered by the bottom 102 of the water treatment tank 100 and the ends of the horizontal bar 104b.

[0043] Each vertical bar 104a is made up of two walls 106a-b which extend generally vertically at a distance from each other and define between them a passage 110.

[0044] The passage 110 extends between the interior of the tank 101 and the space 112 of the associated horizontal bar 104b. Each passage 110 passes through the bottom 102 of the water treatment tank 100 through openings 114 provided for this purpose.

[0045] To operate, the water treatment tank 100 requires the use of different components 52 which are arranged and fixed inside the tank 101. These components 52 are for example filters, pumps, pipes, etc.

[0046] To ensure the fixing of the components 52, the water treatment tank 100 comprises a frame 120, for example made of metal. This frame 120 is arranged inside the tank 101 and in the embodiment of the invention presented here, the frame 120 takes the form of a crown fixed to the bottom 102 of the water treatment tank 100 and inside the tank 101, that is to say above the bottom 102 of the water treatment tank 100.

[0047] To ensure the fixing of the frame 120, the water treatment tank 100 comprises at least one anchoring element 122, here there is one anchoring element 122 per foot 104.

[0048] Each anchoring element 122 is in a space 112 of a horizontal bar 104b.

[0049] For each anchoring element 122, the water treatment tank 100 has a connecting bar 124 fixed between the anchoring element 122 and the frame 120 and the connecting bar 124 is arranged across the passage 110.

[0050] Due to the T-shape of the feet 104, there is a constriction 116 at the transition between the space 112 and the passage 110. This constriction 116 makes it possible to block the anchoring element 122 in the space 112 by preventing it from reaching the passage 110.

[0051] The T-shape of the feet 104 thus allows easy fixing of the frame 120 and the components of the water treatment tank 100.

[0052] Each anchoring element 122 here takes the form of a cylinder.

Claims

Claims

1. Water treatment tank (100) intended to be buried in a hole and comprising: - a tank (101), - a bottom (102) closing the tank (101) in the lower part and intended to come against the bottom of the hole, and - a plurality of feet (104), where each foot (104) is integral with the bottom (102) of the water treatment tank (100) and arranged outside said bottom (102), where each foot (104) takes the shape of an inverted T with a vertical bar (104a) of which a proximal end is integral with the bottom (102) of the water treatment tank (100) and a horizontal bar (104b) integral with a distal end of the vertical bar (104a).

2. Water treatment tank (100) according to claim 1, characterized in that each horizontal bar (104b) is hollow and delimits a space (112) and in that each vertical bar (104a) is made up of two walls (106a-b) defining between them a passage (110) between the interior of the tank (101) and the space (112) of the associated horizontal bar (104b).

3. Water treatment tank (100) according to claim 2, characterized in that it further comprises a frame (120) arranged inside the tank (101), at least one anchoring element (122) housed in the space (112) of a horizontal bar (104b) and for each anchoring element (122), a connecting bar (124) fixed between the anchoring element (122) and the frame (120) through the passage (110).

4. Method for anchoring a water treatment tank (100) according to one of claims 1 to 3, said anchoring method comprising: - a placement step during which the water treatment tank (100) is placed in a hole, - a reinforcement step during which trellises (50) are arranged between each horizontal bar (104b) and the bottom (102) of the water treatment tank (100), and - a sealing step during which concrete is poured onto the trellises (50).

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