Tank including a riser with a break point

Abstract

Title: Tank comprising a riser with a breakaway feature. The invention relates to a tank (1) for the collection and / or treatment of wastewater intended to be buried, the tank being made of plastic material and comprising: - walls (10) delimiting an internal volume, including an upper wall (11); - a riser (2) comprising a peripheral wall (21) extending vertically from the upper wall (11) to an opening (24), the riser (2) being intended to form an inspection chamber, the peripheral wall (21) of the riser (2) having a breakaway feature formed by a groove (3) cut into the thickness of the peripheral wall (21), the groove (3) extending over one of the surfaces of the peripheral wall (21) at a predetermined height of the riser (2) from the upper wall (11), the groove (3) having a bottom (31) with a cross-section shaped like V. Figure for the abridged version: Fig. 1

Description

Title of the invention: Tank comprising a riser with a break point

[0001] The field of the invention is that of the design and manufacture of equipment for collecting and / or treating wastewater.

[0002] More specifically, the invention relates in particular, but not exclusively, to an individual treatment plant tank, of the type integrating an aeration basin and a clarification basin, as well as a tank for collecting wastewater, including runoff water.

[0003] In the context of non-collective sanitation, a distinction is made between homes connected to the collection network of their municipality and those that are not. Until recently, homes not connected to the collection network were generally equipped, or in the best case scenario, with a septic tank for the treatment of domestic wastewater (excluding rainwater) associated with a filter sand tank.

[0004] The evolution of standards and regulations requires homes not connected to the collection network of their municipality to have an individual sanitation system, aimed at returning treated water of predetermined satisfactory quality to the natural environment.

[0005] In this context, one solution for individuals not connected to their municipality's collection network consists in particular of installing a micro-treatment plant.

[0006] A micro-treatment plant can be defined as a solution for treating domestic wastewater, operating on a reduced scale according to the same principle as a collective treatment plant in large cities, by implementing a process known as "activated sludge" or "fixed culture".

[0007] Schematically, microstations comprise at least one tank constituting water reservoirs containing a set of mechanisms (air compressor, pump, electrical panel, etc.), and are generally intended to be buried.

[0008] Conventionally, micro-treatment plants are designed to carry out the following treatment phases: - ventilation; - decantation; - clarification at the end of which purified water is extracted from the micro-station to be generally dispersed in the ground.

[0009] For example, in the context of the treatment of rainwater or wastewater, it is conventional to use pumping stations intended to raise the water level. collected, that is to say to collect water and evacuate it higher than the place from which it comes.

[0010] Lifting station tanks typically have a bottom and a peripheral wall that extends from the bottom to an opening.

[0011] Such tanks take, for example, a cylindrical shape of revolution.

[0012] A lifting station tank can be built directly on its installation site, and is for example masonry.

[0013] A pumping station tank can also be prefabricated. That is, this tank is manufactured in a factory and designed to be able to be moved to the site of its installation. This method of manufacturing and installation is more economical and quicker to carry out.

[0014] The tanks of microstations can also be prefabricated.

[0015] The installation of a prefabricated tank, made of plastic (for example polyethylene or polyester resin reinforced with glass fibers), a microstation or a lifting station, involves digging a pit at least the size of the tank, then inserting the tank into the pit. Then, a filling material is poured around the tank to wedge it inside the pit.

[0016] Cylindrical-shaped risers, for example cylindrical of revolution, can equip these tanks and are intended to form access points to the tanks, closed by covers.

[0017] These risers can be independent of the tanks, and need to be coupled and adjusted on the tanks.

[0018] These risers can also be directly integrated into the tanks.

[0019] The evolution of regulations requires precise height positioning of the inspection chamber in relation to the finished ground level.

[0020] For risers directly integrated into the tanks, adjusting the height of the upper edge of the riser proves problematic.

[0021] Indeed, plastic tanks typically have a wall that can reach a thickness of approximately 1 centimeter and cutting this material is difficult.

[0022] It has been found in particular that using a sabre saw to cut the riser to a precise height results in a cut producing numerous plastic particles. These plastic particles then fall inside the tank and the tank must then be cleaned before putting it into service, which can be particularly long and tedious.

[0023] Compared to the added risers, for example screwed onto the tank to adapt the height of the upper edge of the riser to the height of the finished floor, an upper edge obtained by cutting with a sabre saw is of poor quality. This poor quality aspect results in particular from the presence of numerous burrs, the upper edge of a the raised area being smooth and regular.

[0024] The invention aims in particular to respond to this problem.

[0025] More specifically, the invention aims to propose a plastic tank, for the collection and / or treatment of waste water, which incorporates a riser capable of being easily adapted in height.

[0026] The invention also aims to provide such a tank, the operation of which of setting the extension to the correct height makes it possible to obtain an upper edge of the extension which is of higher quality than what is possible with the prior art when a sabre saw is used.

[0027] The invention also aims to provide such a tank in which the operation of setting the riser to the correct height does not require any subsequent maintenance operation, or minimizes these operations.

[0028] These objectives, as well as others which will appear subsequently, are achieved thanks to the invention which relates to a tank for the collection and / or treatment of waste water intended to be buried, the tank being made of plastic material and comprising: - walls delimiting an internal volume including an upper wall; - a riser comprising a peripheral wall extending in height from the upper wall to an opening, the riser being intended to form a manhole, characterized in that the peripheral wall of the riser has an incipient rupture formed by a groove formed in the thickness of the peripheral wall, the groove extending on one of the surfaces of the peripheral wall at a predetermined height of the riser from the upper wall, the groove having a bottom with a V-shaped cross-section.

[0029] The tank according to the invention incorporates a riser which has the capacity to be easily adjusted in height while producing an adjusted upper edge which is qualitative compared to adjustments according to the prior art using a sabre saw.

[0030] The height at which the groove is located defines the height of the adjusted riser.

[0031] The raising of the tank according to the invention thus has, along its height, two parts, a lower part located below the groove and an upper part located above the groove.

[0032] In the case where, during installation of the tank according to the invention, the installer wishes to adjust the height of the riser, then he simply has to separate the upper part from the lower part. This separation is possible because the groove forms an incipient break making the upper part divisible from the lower part.

[0033] The breaking of the upper part relative to the lower part can be produced for example by means of an ad hoc traction of the upper part.

[0034] The rupture of the rupture initiation can also be created by an adequate shock.

[0035] Consequently, adjusting the height of the riser proves to be particularly simple to implement compared to techniques using, for example, a sabre saw and requiring a cut to be made around the entire circumference of the riser.

[0036] Furthermore, the groove predetermines the shape of the break and thus the shape of the adjusted upper edge of the riser. Consequently, this shape of the adjusted upper edge is not dependent on the manner in which a tool is manipulated to make a cut.

[0037] Due to the fact that a break allows to produce an upper edge adjusted for the riser, then no particles are produced resulting from sawing of the material of the peripheral wall.

[0038] Consequently, thanks to the tank according to the invention, it is possible to set the riser at the correct height without requiring any maintenance operation or by minimizing these subsequent maintenance operations.

[0039] The reduction in the thickness of the wall, resulting from the presence of the groove which is formed in the thickness of the peripheral wall, and the fact that the bottom of the groove has a V shape, make it possible to achieve a break with a clean edge, without burrs. This is particularly advantageous and the appearance of the adjusted upper edge of the riser is qualitative.

[0040] According to a preferred embodiment, along a plane transverse to the peripheral wall, the peripheral wall has above the groove a bead forming a striking zone to cause a rupture of the peripheral wall by the initiation of rupture.

[0041] Thanks to this embodiment, the rupture of the riser at the level of the groove is achieved by means of one or more strikes made on the striking zone(s).

[0042] For example, it is possible to use a mallet to strike the striking area located above the groove, on a first side of the bowl, thereby producing a rupture of the entire groove on this first side of the bowl.

[0043] Subsequently, one or more strikes of the bead located on the second side of the tank, opposite the first side, make it possible to finish breaking the peripheral wall at the level of the groove on this second side.

[0044] Advantageously, the peripheral wall of the riser has an annular corrugation projecting inside the riser, the groove being located in the hollow of the corrugation, and an upper side of the annular corrugation forming the bead.

[0045] This annular corrugation makes it possible to guide the forces exerted on the peripheral wall in the direction of the groove during a strike of the strike zone formed by the upper part of the annular corrugation which constitutes a bead.

[0046] According to an advantageous characteristic, the V-shape of the bottom of the groove defines a acute angle, preferably the V shape inscribed in a triangle with: - a base of 4 to 8 mm, and advantageously 6 mm; - a height of 15 mm to 30 mm, preferably 20 mm.

[0047] It has been found that such dimensions, and more particularly the dimensions described as advantageous, make it possible to maximize the technical effect of the rupture initiation.

[0048] According to a preferred design, at the bottom of the groove, the peripheral wall has a thickness equal to approximately 3 / 10ths of the average thickness of the peripheral wall.

[0049] This design helps to maximize the effect of the rupture initiation.

[0050] Advantageously, the peripheral wall has a thickness of 10 mm around the groove and a thickness of 3 mm at the bottom of the groove.

[0051] According to a preferred embodiment, the tank is rotationally molded.

[0052] The groove which has a bottom with a V-shaped cross-section thus naturally causes a reduction in the thickness of the peripheral wall at the end of the groove, in continuity with its bottom. This reduction in thickness thus promotes a clean and clear break following the performance of an action capable of causing the break at the level of the groove.

[0053] Preferably, the groove has a V-shaped cross-section.

[0054] In this way, the breakage caused by the groove is optimized.

[0055] According to a first variant, the groove is uninterrupted.

[0056] Thanks to an uninterrupted groove, it is not necessary to perform any action other than that necessary to cause the rupture of the parts of the extension separated by the groove.

[0057] According to a second variant, the groove is interrupted by at least one reinforcement to be cut.

[0058] According to this variant, it is also necessary to cut out the reinforcement(s) in order to be able to separate the two parts located on either side of the groove.

[0059] The presence of this or these reinforcements makes it possible to avoid an unwanted separation of the part lower than the furrow from the part upper than the furrow.

[0060] The invention also relates to a tank mold for the collection and / or treatment of wastewater intended to be buried, the mold having an imprint of a tank as defined above.

[0061] Other characteristics and advantages of the invention will appear more clearly on reading the following description of different preferred embodiments of the invention, given as illustrative and non-limiting examples, and the appended drawings among which: • [Fig.l] [Fig.l] is a schematic representation in side view of a tank according to the invention; • [Fig.2] [Fig.2] is a schematic representation in side view of a raising a tank according to a first embodiment of the invention; • [Fig.3] [Fig.3] is a schematic representation of the first embodiment, in side view centered on a part of annular corrugation presented by a peripheral wall of the riser, the annular corrugation having a groove forming an incipient rupture of the riser; • [Fig.4] [Fig.4] is a schematic representation of detail illustrating the thickness of the peripheral wall relative to the detail illustrated by [Fig.3]; • [Fig.5] [Fig.5] is a schematic representation of another embodiment in which the groove is centered in an annular corrugation of the riser; • [Fig.6] [Fig.6] is a schematic representation in top view of the shape of the groove, the groove being, according to this embodiment, interrupted by reinforcements.

[0062] With reference to Figures 1 and 2, a tank 1 for the collection and / or treatment of wastewater is shown.

[0063] The tank 1 shown is more particularly a microstation tank.

[0064] This tank 1 is intended to be buried.

[0065] The tank 1 is made of a plastic material.

[0066] This plastic material is, for example, polyethylene, or polyester resin reinforced with glass fibers.

[0067] The tank 1 is for example obtained by rotational molding.

[0068] The invention also relates to a mold having an imprint of the tank 1. This mold is suitable for manufacturing by rotational molding.

[0069] The tank 1 comprises a riser 2.

[0070] More precisely, the tank 1 comprises a main body 10 delimiting an internal volume surmounted by the extension 2.

[0071] Tank 1 is a single-piece unit.

[0072] Advantageously, the extension 2 is made in one piece with the main body 10 of the tank 1.

[0073] More precisely, the tank 1 comprises walls which delimit the internal volume.

[0074] The walls are composed in particular of a base 13, side walls 12, as well as an upper wall 11.

[0075] The side walls 12 extend from the bottom 13 to the upper wall 11.

[0076] The upper wall 11 has a passage.

[0077] This passage, presented by the upper wall 11, is bordered and extended by the riser 2.

[0078] The extension 2 comprises a peripheral wall 21 which extends in height from the upper wall 11 to an opening 24.

[0079] The extension 2 is intended to form a look.

[0080] The peripheral wall 21 of the extension 2 adopts in particular a cylindrical shape.

[0081] The opening 24, located at an upper end of the extension 2, is intended to be closed with a pad.

[0082] According to the principle of the invention, the extension 2 of the tank 1 can be separated in two at a predetermined height to reduce its height.

[0083] For this purpose, and with reference to figures 1 to 6, the peripheral wall 21 of the extension 2 has an incipient rupture.

[0084] Indeed, the peripheral wall 21 comprises a groove 3 which is formed in the thickness of the peripheral wall 21. This groove 3 thus forms the initiation of rupture.

[0085] In other words, the initiation of rupture corresponds to a zone of fragility of the peripheral wall 21.

[0086] The groove 3 extends on one of the surfaces of the peripheral wall at a predetermined height of the riser 2 from the upper wall 11.

[0087] According to the present embodiment, the groove 3 extends over the external surface of the peripheral wall 21, this external surface being opposite the internal surface which is oriented towards the interior of the tank 1, relative to the peripheral wall 21.

[0088] By extending to a predetermined height, the groove 3 surrounds the riser 2.

[0089] In other words, the groove 3 extends over the entire external surface of the peripheral wall 21 at the predetermined height.

[0090] With reference to [Fig.6], the shape adopted by the groove 3 is shown, seen from above.

[0091] As can be observed according to the embodiment illustrated by [Fig.6], the groove 3 is interrupted by reinforcements 4 to be cut.

[0092] Indeed, [Fig.6] illustrates the depth of the furrows 3.

[0093] As can be seen, four reinforcements 4 interrupt the groove 3, these reinforcements 4 being intended to be cut.

[0094] According to an embodiment not shown, the groove 3 is uninterrupted. In other words, no reinforcement interrupts the groove 3.

[0095] According to this embodiment not shown, the groove 3 runs around the entire perimeter of the peripheral wall 21 at the predetermined height.

[0096] As can be seen from Figures 3, 4 and 5, the groove 3 has a bottom 31 with a V-shaped cross-section.

[0097] This V-shaped cross-section defines in particular an acute angle A, as is shown in particular in [Fig.4]. This acute angle A is measured from the outside of the extension 2.

[0098] In this way, the break initiation formed by the groove 3 makes it possible to produce a clean cut when applying a force causing a break at the level of the groove 3.

[0099] According to the present embodiments, the groove 3 more generally has a V-shaped cross-section.

[0100] The groove 3 has, according to a cross section, an upper face 311 and a lower face 312.

[0101] For information purposes, and with reference to [Fig.3], the V-shape of the groove 3 defines a triangle with: - a base b with a length “lo” of 4 to 8 mm, and advantageously 6 mm, and - a height “h” of 15 to 30 mm, and advantageously 20 mm.

[0102] [Fig.4] schematically illustrates the thickness of the peripheral wall 21. The groove 3 produces a reduction in thickness of the peripheral wall 21 at its bottom 31.

[0103] Advantageously, the peripheral wall 21 has, at the level of the bottom 31 of the groove 3, a reduced thickness equal to approximately 3 / 10ths of the thickness at the level of the periphery of the groove 3.

[0104] For information purposes, the peripheral wall 21 has a thickness of 10 mm around the groove 3 and thus a thickness of 3 mm at the bottom 31 of the groove 3.

[0105] With reference to Figures 1 to 5, and according to the present embodiments, the peripheral wall 21 of the extension 2 has an annular corrugation 22 which projects inside the extension 2.

[0106] The groove 3 is then located in a hollow defined by the annular corrugation 22.

[0107] According to the embodiment illustrated by [Fig.3], the groove 3 is offset below of a median plane PM of the annular corrugation 22.

[0108] Still according to this embodiment, the lower face 312 advantageously lies in a plane perpendicular to the height along which the extension 2 extends.

[0109] In this way, when the extension 2 breaks at the level of the groove 3, then a clear edge, extending essentially perpendicular to the height of the extension 2 is created, in continuity, or essentially in continuity, of the lower face 312.

[0110] With reference to the embodiment of [Fig.5], the groove 3 is centered in the annular corrugation 22. The upper face 311 and the lower face 312 are then symmetrical to each other along the median plane dividing the annular corrugation 22 in two.

[0111] The annular corrugation 22 also has the effect that an upper side of this annular corrugation 22 forms a bead 211 located above the groove 3.

[0112] This bead 211 can be used as a striking zone to be impacted to cause a rupture of the peripheral wall 21 by the initiation of rupture formed by the groove 3.

[0113] According to one possible embodiment, the groove 3 is neither located in an annular corrugation 22, nor overhung by a bead 211.

[0114] According to another conceivable embodiment, the annular corrugation 22 may not be present, and only a bead 211 is then located above the groove 3.

[0115] Thanks to the tank 1 according to the invention, an adaptation and an adjustment of the height of the riser 2 is possible by means of one or more strikes, for example using a mass, of the striking zone formed by the bead 211 above the groove 3.

[0116] This is particularly simple to implement at the installation site of a tank 1 according to the invention.

[0117] This adjustment of the height of the riser 2 produces a clear break in the riser 2 along the entire length of the groove 3.

[0118] A pad intended to be used to close the extension 2 can be placed on the new upper edge of the extension 2 following the break at the groove 3.

Claims

Demands

1. Tank (1) for the collection and / or treatment of wastewater and rainwater intended to be buried, the tank being made of plastic material and comprising: - walls (10) delimiting an internal volume, including an upper wall (il); - a riser (2) comprising a peripheral wall (21) extending vertically from the upper wall (11) to an opening (24), the riser (2) being intended to form an inspection chamber, characterized in that the peripheral wall (21) of the riser (2) has a break point formed by a groove (3) made in the thickness of the peripheral wall (21), the groove (3) extending over one of the surfaces of the peripheral wall (21) at a predetermined height of the riser (2) from the upper wall (11), the groove (3) having a bottom (31) with a V-shaped cross-section.

2. Tank (1) according to the preceding claim, characterized in that, along a plane transverse to the peripheral wall (21), the peripheral wall (21) has above the groove (3) a bead (211) forming a striking zone to cause a rupture of the peripheral wall (21) by the initiation of rupture.

3. Tank (1) according to the preceding claim, characterized in that the peripheral wall (21) of the riser (2) has an annular corrugation (22) projecting inside the riser (2), the groove (3) being located in the hollow of the annular corrugation (22), and an upper face of the annular corrugation (22) forming the bead (211).

4. Tank (1) according to any one of the preceding claims, characterized in that the V-shape of the bottom (31) of the groove (3) defines an acute angle.

5. Tank (1) according to any one of the preceding claims, characterized in that at the level of the bottom (31) of the groove (3), the peripheral wall (21) has a thickness equal to about 3 / 10ths of the average thickness of the peripheral wall (21).

6. Tank (1) according to any one of the preceding claims, characterized in that it is rotomolded.

7. Tank (1) according to any one of the preceding claims, characterized in that the groove (3) has a V-shaped cross-section.

8. Tank (1) according to any one of the preceding claims, characterized in that the groove (3) is uninterrupted.

9. Tank (1) according to any one of the preceding claims, characterized in that the groove (3) is interrupted by at least one reinforcement (4) to be cut.

10. Tank mold (1) for the collection and / or treatment of wastewater intended to be buried, the mold having a tank imprint (1) according to any one of the preceding claims.

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