Note: Descriptions are shown in the official language in which they were submitted.
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EFFLUENT FILTRATION TANK
Field of the Invention
The present invention relates to a tank intended to be buried and for
containing
wastewater in particular.
Background
The intended applications concern the fields of construction and public works,
agriculture and industry.
A tank for such an application is often made from polyester or medium-density
polyethylene (MDPE). Such a tank does not effectively withstand being buried
since it
can deform due to a lack of rigidity if it is buried when it is not completely
filled.
Summary of the Invention
The object of the invention is therefore to propose a tank which withstands
the
pressure that the material surrounding the tank may exert once the latter has
been
buried.
To this end, there is proposed a tank intended to be buried and for containing
wastewater in particular, the tank comprising a casing having an upper part
and a lower
part, the tank being provided internally with a means for reinforcing the
structure of the
casing so that it can withstand the pressure exerted by the surrounding
material when
the tank is buried and is not completely filled; according to the invention,
the
reinforcing means comprises voussoirs bearing against the upper part and the
tank
incorporates means for absorbing the supporting forces of the voussoirs so as
to transfer
said forces onto the bottom of said tank.
A tank is thus obtained which withstands being buried without deforming even
though it may be only partially filled.
According to an additional feature of the invention, each voussoir comprises a
wall in the shape of an arch portion capable of mating internally with a
rounded wall of
the upper part, and the means for absorbing the forces consist of bars and
tubes.
The bars and tubes transfer the forces to the bottom of the tank.
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According to an additional feature of the invention, a gap separates the upper
part and the lower part, and the reinforcing means comprises wedges, the
voussoirs and
the wedges being provided respectively with lugs which are inserted in the
gap, at least
some of the voussoirs and wedges being connected via connecting bars.
The voussoirs are secured to the casing and reinforce the upper part. The
wedges
are secured to the casing and reinforce the sides of the tank. The connecting
bars
transfer the forces which are applied externally to the casing by the
surrounding
material to other voussoirs and other wedges when the tank is buried.
According to an additional feature of the invention, the tank comprises in its
bottom a permeable floor intended to support a means for filtering the liquid
that may
be introduced into said tank, the floor being connected to the voussoirs and
to the
wedges via connecting bars.
The floor absorbs the forces having a vertical component which are transmitted
by the voussoirs and the wedges, so as to avoid any weakening of the tank when
it is
buried.
According to an additional feature of the invention, the floor is composed of
a
plurality of elements placed in a juxtaposed manner on the bottom and separate
therefrom.
These floor elements allow the liquid filtered through the filtration means to
flow towards the bottom of the tank.
According to an additional feature of the invention, the floor comprises two
end
elements placed one on each side of at least one intermediate element, the end
element
being provided with a boss in which there is formed a housing for receiving
the end of a
connecting bar, the intermediate element being provided respectively with two
bosses in
which there are formed two housings for receiving the ends of two connecting
bars.
Each floor element withstands part of the load transferred either by voussoirs
or
by a wedge.
According to an additional feature of the invention, the wall in the shape of
an
arch portion is surmounted by a wall in the shape of a plate, the large length
of which is
arranged perpendicular to the median plane of the wall so as to support
locally the rim
of an access opening of the tank, the wall in the shape of an arch portion
being
prolonged, opposite the plate and in its dorsal part, by a lug able to be
inserted in the
gap provided between the upper part and the lower part of the casing, a first
housing
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being formed in the wall, through its inner face, facing horizontally, so as
to receive an
end of a connecting bar, a second housing being formed in the wall, through
its inner
face, facing downwards, so as to receive an end of another connecting bar.
According to an additional feature of the invention, each wedge consists of a
block delimited on one side by two lateral facets and one bottom facet which
is intended
to face downwards, and delimited on the other side by a lug able to be
inserted in the
gap provided between the upper part and the lower part of the casing, two
housings
being formed respectively in the two lateral facets so as to receive an end of
a
connecting bar, a third housing being formed in the bottom facet so as to
receive an end
of a third connecting bar.
According to an additional feature of the invention, the housings formed in
the
floor element and the second housing formed in the voussoir are connected
respectively
to vents which open outwards, the corresponding connecting bars being hollow
so that
the part located below the floor can be ventilated.
According to an additional feature of the invention, the housing formed in the
floor element is connected to a vent which opens outwards, the connecting bar
between
the floor element and the wedge and the connecting bars between the wedge and
the
voussoir are hollow, and the housings formed in the wedge open outwards.
According to an additional feature of the invention, bridges are fonned
locally in
the gap between the upper part and the lower part so as to reinforce the
connection
thereof and to laterally wedge the voussoirs and the wedges.
According to an additional feature of the invention, the tank is provided with
an
external peripheral belt intended to form a rigid connecting structure between
the two
parts.
According to an additional feature of the invention, the upper part, the lower
part and the belt consist of one and the same continuous wall.
According to an additional feature of the invention, the belt is composed of a
first semicircular loop which prolongs the wall of the upper part, a short
straight portion
which is prolonged by a second, larger semicircular loop, a straight portion,
another
semicircular loop, another short straight portion which is prolonged by a
fourth
semicircular loop which is connected to the wall of the lower part, the first
loop and the
fourth loop being separate so as to form the gap between the two parts.
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This structure makes it possible to form a means for wedging the voussoirs and
the wedges.
According to an additional feature of the invention, the reinforcing means
comprises posts secured by their ends in housings respectively formed in the
upper wall
of the tank and in its bottom.
When the tank is lifted by its upper wall, the posts work in traction to join
the
upper wall and the bottom of the tank. When the tank is buried, the posts work
in
compression so that the tank can withstand the load of the surrounding
material on its
upper wall. This load is transferred by the posts to the bottom of the tank.
According to an additional feature of the invention, the reinforcing means
comprises a beam secured to two opposite sides of the tank.
This beam provides increased resistance to weakening of the tank in its
central
part.
According to an additional feature of the invention, a plate protrudes
downwards
so as to be able to bear against the bottom 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 protrude from the beam in a direction opposite to the
plate and the
free ends of which are fixed to the upper wall so that the beam can join the
upper wall
and the bottom of the tank in order to make the latter more rigid.
According to an additional feature of the invention, each voussoir comprises
two
rectilinear profiles butted against the wall in the shape of an arch portion.
The voussoir laterally supports the upper wall of the tank. It is intended to
be
combined with a tank of relatively large capacity.
According to an additional feature of the invention, the tank is provided with
an
outlet orifice intended for evacuating the treated effluent to an authorised
outfall.
This tank is suitable in particular for irrigating the ground with the aid of
drains.
According to an additional feature of the invention, the bottom is perforated
by a
plurality of passages so as to enable the effluent to infiltrate, by gravity,
the ground on
which the tank rests.
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This tank is suitable for infiltrating the ground directly with the filtered
effluent,
when the ground so permits, and according to the legislation in force.
According to an additional feature of the invention, the bottom consists of a
component attached to the tank.
Depending on whether the bottom is or is not perforated, it is possible to
construct a remote discharge tank or a tank providing direct infiltration of
the ground.
According to an additional feature of the invention, the casing is made by a
rotational moulding method.
According to an additional feature of the invention, the floor elements, the
voussoirs, the wedges and the connecting bars are made by a rotational
moulding
method.
According to an additional feature of the invention, the rotational moulding
method uses a starting material capable of forming a polyethylene foam.
Brief Description of the Drawings
The abovementioned features of the invention, as well as others, will become
more clearly apparent upon reading the following description of an example of
embodiment, said description being given with reference to the appended
figures, in
which:
FIG. 1 shows a front view of a tank according to the invention,
FIG. 2 shows a sectional view from the front of a tank according to the
invention,
FIG. 3 shows a sectional view from the side of a tank according to the
invention,
FIG. 4 shows a sectional view of a detail of a belt for connecting between a
lower part and an upper part of a tank according to the invention,
FIG. 5 a shows a front view of a floor supporting a reinforcing means for a
tank
according to the invention,
FIG. 5 b shows a top view of a floor supporting a reinforcing means for a tank
according to the invention,
FIG. 5 c shows a side view of a floor supporting a reinforcing means for a
tank
according to the invention,
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FIG. 6 a shows a front view of an end element of a floor for a tank according
to
the invention,
FIG. 6 b shows a top view of an end element of a floor for a tank according to
the invention,
FIG. 6 c shows a sectional view from the side of an end element of a floor for
a
tank according to the invention,
FIG. 7 a shows a front view of an intermediate element of a floor for a tank
according to the invention,
FIG. 7 b shows a top view of an intermediate element of a floor for a tank
according to the invention,
FIG. 7 c shows a side view of an intermediate element of a floor for a tank
according to the invention,
FIG. 8 a shows a front view of a voussoir for a tank according to the
invention,
FIG. 8 b shows a side view of a voussoir for a tank according to the
invention,
FIG. 8 c shows a back view of a voussoir for a tank according to the
invention,
FIG. 9 a shows a side view of a wedge for a tank according to the invention,
FIG. 9 b shows a top view of a wedge for a tank according to the invention,
FIG. 9 c shows a front view of a wedge for a tank according to the invention,
FIG. 10 shows a view in longitudinal section of a variant embodiment of a tank
allowing direct infiltration of the ground by a filtered effluent according to
the
invention,
FIG. 11 shows a perspective view of an attached bottom for a tank according to
the invention,
FIG. 12 shows a view in longitudinal section and in perspective of the variant
embodiment of a tank according to the invention,
FIG. 13 shows a perspective view of a variant embodiment of a voussoir
intended to reinforce the internal structure of a tank of relatively large
capacity,
FIG. 14 shows a view in cross section and in perspective of a tank of FIG. 10,
and
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FIG. 15 shows a perspective view of a beam intended to be secured in a tank
according to the invention.
Detailed Description
The tank 100 shown in FIGS. 1, 2 and 3 is intended to contain in particular
wastewater in order to sanitise, purify or filter the latter.
This tank is intended to be buried so that it can be concealed and to
facilitate the
collection of wastewater by gravity. Only an access to the tank for the
purpose of
maintenance on the latter is visible once the tank has been buried.
The tank 100 thus makes it possible to collect the effluent and to treat it so
that it
can exit through an outlet orifice to which there is connected a pipe for
transferring it
for example to a spreading drain.
The casing 110 thus comprises an upper part 200 and a lower part 300 which are
joined by a peripheral belt 400 located at the half-way height of the tank and
intended to
form a rigid connecting structure between the two parts.
The upper part 200 is composed of an upper wall 202 which is prolonged at its
periphery and in the downward direction by rounded walls 204 which connect to
the
belt 400. An access opening 206 for access to the interior of the tank is
formed in the
upper wall 202. This opening 206 is able to be closed by a cover 210.
The lower part 300 is composed of a bottom 310 of parallelepiped appearance
which is surmounted at its periphery by rounded walls 304 which connect to the
belt 400. Beads 220 are formed in a hollowed-out manner or in relief in the
wall of the
upper part 200 and of the lower part 300 so as to increase the rigidity of the
structure of
the casing 110 of the tank 100.
In the detail view in FIG. 4, the upper part 200, the belt 400 and the lower
part 300 consist of one and the same continuous wall. The belt 400 is situated
outside
the tank, thus forming a tank protection belt. It has 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 semicircuLr loop403, then a straight portion 404, another
semicircular loop 405 and another short straight portion 406 which is
prolonged by a
fourth semicircular loop 407 which connects to the wall of the lower part 300.
The first
loop 401 and the fourth loop 407 are separate, thus forming a gap I between
the two
parts 200 and 300 and the purpose of which will be explained below. However,
several
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securing bridges P locally join the two parts 200 and 300. These bridges P are
located
between recessed portions of the first loop 401 and of the fourth loop 407.
In FIGS. 1, 2 and 3, the bottom 310 is composed of a bottom wall 312 adjoined
vertically at its periphery by side walls 314which connect to the lower part
300. As is
clearly apparent in FIG. 2, it is intended to receive a floor 500 which is
provided on the
one hand for supporting a filtration means (not shown) for filtering the
wastewater, and
on the other hand for holding a reinforcing means 600 for reinforcing the
structure of
the casing 110 of the tank 100.
This wastewater can enter the tank through an inlet orifice 230 located in the
top
part of the upper part 200 and can exit, after having passed through the
filter, through an
outlet orifice 330 located in the bottom 310 so as to be evacuated through a
pipe to an
authorised outfall.
The weight-bearing part of this floor 500 which is intended to support the
filter
is permeable and it is placed above the outlet orifice 330 so that the water
filtered
through this filter can flow through the floor and can exit from the tank
through the
outlet orifice 330.
The floor 500 consists of a plurality of elements 510 and 530 which rest on
the
bottom wall 312 and also on a peripheral edge318 which joins the bottom 310 to
the
lower part 300, these elements being placed in a juxtaposed manner but without
being
joined.
The central part of the floor 500 forms a pit for capturing the filtered water
that
can flow between gaps that exist between two neighbouring elements 510, 530.
In the view of the floor 500 shown in FIGS. 2, 5 a and 5 b, said floor is
composed of two end elements 510 a and 510 b and of at least one intermediate
element 530 and in this case of two intermediate elements 530 a and 530 h.
In FIG. 6, the end element 510 is composed of a C-shaped wall 511 which
locally delimits the edge of the pit, and of a bottom wall 512 which partly
forms the
bottom of the pit, this bottom wall 512 being joined to the wall 511 by side
walls 513.
Other walls 514 in the shape of a cross protrude below the element 510 so as
to form a
means of wedging the latter in the bottom of the tank and a means on which the
floor
element bears.
In FIG. 7, the intermediate element 530 is composed of two
walls 531 a and 531 b arranged on each side of the intermediate element 530
which
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locally delimit the edge of the pit, and of a bottom wall 532 which partly
forms the
bottom of the pit, this bottom wall 532 being joined to the walls 531 a, 531 b
by side
walls 533. Other walls 534 in the shape of a cross protrude below the element
530 so as
to form a means of wedging the latter in the bottom of the tank and a means on
which
the floor element bears.
In FIG. 3, the means of wedging the elements 510 and 530 cooperate with
corresponding indents 316 formed in the bottom wall 312 of the casing 110 so
as to
laterally wedge the elements when they are juxtaposed and so as to separate
them, and
on which said elements also rest.
The reinforcing means 600 is designed to be secured on the one hand to the
floor 500 and to be secured on the other hand to the upper part and the lower
part in
order to make the structure of the casing more rigid so that it can withstand
the pressure
exerted by the surrounding material when the tank is buried and is not filled
or is filled
only a little.
The reinforcing means 600 is composed of voussoirs 610, wedges 630 and
connecting bars 650 placed between these elements or between these elements
and the
floor 500.
The voussoirs 610 are intended to bear against rounded walls 204 and to be
secured in the gaps I which exist between the upper part 200 and the lower
part 300 so
as to absorb and transfer the forces likely to be exerted externally on the
upper
part200 and on the belt 400 of the casing 110 of the tank 100.
In FIG. 8, the voussoir 610 comprises a wall 611 in the shape of an arch
portion -
capable of mating internally with a rounded wall of the upper part. This wall
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 the
access opening of the tank. Opposite the plate 612, the wall 611 is prolonged
in its
dorsal part by a lug 613 of small thickness able to be inserted in the gap
provided
between the upper part and the lower part of the casing of the tank.
A first housing 614 is formed in the wall 611, through its inner face, facing
horizontally in FIG. 8 a, so as to receive an end of a connecting bar capable
of securing
the voussoir to another one arranged opposite it. In FIG. 5 b, four voussoirs
610 are thus
joined in pairs by respectively Lwo bars 650 a.
In FIG. 8, a second housing 615 is formed in the wall 611, through its inner
face,
facing downwards in FIG. 8 a, so as to receive an end of a connecting bar
capable of
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securing the voussoir to a floor element. In FIGS. 5 a and 5 c, each
voussoir610 is
joined to an intermediate element 530 by a bar 650 b.
In FIG. 7, this intermediate element 530 is provided on its two side
walls 533 with respectively two bosses 535 in which there are formed two
housings 536 for receiving the ends of two connecting bars 650 b.
In FIG. 3, the pressure likely to be exerted by the surrounding material on
the
upper part 200 is absorbed by each voussoir610 so as to be transferred to
another
voussoir placed opposite or so as to be transferred to the bottom 310 of the
casing110 of
the tank 100 via the floor 500 so as to avoid any weakening of said casing
under the
load.
The wedges 630 are intended to be secured in the gaps I that exist between the
upper part 200 and the lower cut 300 so as to absorb and transfer the forces
likely to be
exerted on the upper part 200 and the belt 400 of the casing 110 of the
tank100.
In FIG. 9, the wedge 630 consists of a block delimited on one side by two
lateral
facets 631 a and 631 b and one bottom facet 632 which is intended to face
downwards,
and delimited on the other side by a lug 633 of small thickness able to be
inserted in the
gap provided between the upper part and the lower part of the casing of the
tank.
The two side facets 631 a and 631 b form between them an angle of
approximately 90 . Two housings 634 a, 634 b are formed respectively in two
lateral
facets 631 a and 631 b so as to receive an end of a connecting bar capable of
securing
the wedge to two obliquely arranged voussoirs. In FIGS. 5 b and 5 c, each
wedge 630 is
joined to two voussoirs 610 by respectively two bars 650 c.
In FIG. 9, a third housing 635 is formed in the bottom facet 632 so as to
receive
a connecting bar capable of securing the wedge to a floor element. In FIG. 5,
each
wedge 630 is joined to an end element 510 by a bar 650 d.
In FIG. 6, this end element 510 is provided on its bottom wall 512 with a
boss 515 in which there is formed a housing 516 for receiving the end of a
connecting
bar 650 d.
In FIG. 3, the pressure likely to be exerted by the surrounding material on
the
upper part 200 and on the belt 400 is absorbed by each voussoir 610 and by
each
wedge 630 so as to be transferred to another voussoir or another wedge or so
as to be
transferred to the bottom 310 of the casing 110 of the tank 100 via the floor
500 so as to
avoid any weakening of the casing110 under the load.
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It will be noted that, in FIGS. 7 and 8 respectively, the housings 536 formed
in
the floor element 530 and the housing 615formed in the voussoir 610 open
outwards
and that vents 538 and 618 which open outwards are formed in the wall of these
hollow
components, thus opening up a passage through these elements which allows air
to
circulate as shown by the arrows A. Furthermore, the corresponding connecting
bars 650 are hollow so that, as can be seen in FIG. 3, it is possible to
ventilate the part
located below the floor in order to promote, with the volume of air contained
in the
tank, by supplying oxygen, the functioning of the tank 100.
In FIG. 7 a, the vent 538 opens outwards below the walls 531.
In FIG. 8 a, the vent 618 formed in the voussoir 610 opens outwards below the
fixing
plate 612, that is to say in its top part, so that its opening is located
above the maximum
level of liquid that can be contained in the tank, so as to avoid the
formation of a siphon.
In one variant embodiment, the ventilation of the part located below the floor
is
also carried out through connecting bars supporting the wedges and through
connecting
bars connecting the wedges to the voussoirs. In FIG. 8 a, the floor element510
is to this
end provided with a corresponding vent 518 which opens outwards.
In FIG. 9, the three housings 634 a, 634 b and 635 formed in the
wedge 630 open outwards, allowing communication between them.
In FIG. 2, the arrows A show that the air can circulate between the
voussoirs 610 and the four floor elements 540 a, 530 a,530 b and 510 b.
The elements constituting the floor 500 and the reinforcing means 600 are
introduced into the tank through the access opening 206. In a first phase, the
floor 500 is
constructed by arranging the elements 510 and 530 side by side on the bottom
wall 312.
In a second phase, the voussoirs 610 and the wedges 630 are put in place so
that
the lugs 613 and 633 are introduced into the gap I and between two bridges P
so as to
wedge them laterally. The connecting bars 650 are fixed between the floor
elements 510, 530 and the voussoirs 610 and the wedges 630, between the
voussoirs 610, and between the wedges 630and the voussoirs 610. In order to
house the
ends of some bars, this operation may be assisted by using rams to
provisionally move
apart the walls of the casing 110.
In a third phase, securing by bolting takes place of the elements 510, 530 to
the
bottom 310, the lugs 613, 633 held in the gap I between bridges P, and the
plates 612 of
the voussoirs 610 at the periphery of the access opening 206.
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The tank of the invention does not deform once it has been buried when it is
not
filled or is incompletely filled.
The reinforcing means 600 behaves as a shoring internal to the tank in order
to
reinforce the structure thereof so that it withstands a pressure likely to be
applied
externally thereto.
It also prevents the casing 110 from weakening under the load.
The belt 400 protects the casing 110 at the join between its upper part 200
and
its lower part 300. It also reinforces the structure of the casing.
The constituents of the tank 100, of the floor 500 and of the reinforcing
means 600 are advantageously made from polyethylene by a rotational moulding
method which makes it possible to obtain hollow parts of relatively large
dimensions.
The tank 100, that is to say the upper part 200, the lower part 300 and the
belt 400, are
made in a single piece, this being the only valid solution for obtaining a
perfectly
leaktight tank.
The elements 510 and 530 of the floor 500 can be manufactured by the
rotational moulding method by using a starting material capable of forming a
polyethylene foam in order to increase their rigidity.
The tank of the invention can be delivered ready for use.
In a variant embodiment shown in FIG. 10, the tank 100 is intended to
infiltrate
the ground directly with the filtered effluent. The tank in this case has no
floor and its
bottom 310 includes a bottom wall 312 which is perforated by a plurality of
passages313 so as to enable the effluent to infiltrate, by gravity, directly
the ground on
which the tank rests. The bottom wall 312 has to this end a crenulated section
and
slots 313 are formed transversely in the lowest facets of the crenulated
section.
In FIG. 11, a pit 320 is attached to the bottom 310 of the tank 100 for
example
by a welding operation in order to collect the filtered effluent. This pit 320
is used in a
tank provided with an outlet orifice, when an infiltration tank cannot be
used.
A filtration grille may cover the bottom of this pit or the bottom of the tank
in
order to prevent the filtration means from leaving the tank.
In FIG. 10 and in order to enable the tank to be transported when it is
filled, the
reinforcing means 600' incorporates a connection means 660 for connecting
between
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the upper wall 202 of the tank and its bottom 310. This connection means
advantageously consists of posts 660 secured by their ends in housings 662
fomied in
the upper wall 202 and in the bottom310. During transport of the tank, and
when it is
lifted by its upper wall, the posts 660 work in extension and retain the
bottom310.
When the tank is buried, the posts 660 work in compression by transferring the
load
supported by the upper part 200 of the tank to its bottom 310.
The reinforcing means 600' also comprises voussoirs 610' having a structure
different from that of the first embodiment of the tank, which voussoirs
support its
upper part 200 by being embedded partially in reinforcements of this upper
part 200 and
by bearing on the one hand against the rim of the access opening 206 and on
the other
hand, at the level of the belt 400 and by their other edge, on tubes 670. The
lower ends
of these tubes bear against the bottom 310 of the tank 100. Each voussoir610'
comprises
a wall 611 in the shape of an arch portion capable of mating internally with a
rounded
wall of the upper part. It also has no lug. The combination of each voussoir
and its
corresponding tube reinforces the end structures of the tank.
In FIG. 12, each voussoir 610' and its corresponding tube 670 are hollow and
are
provided with vents, thus providing a passage through these elements which
enables air
to circulate in the tank 100.
In a variant embodiment shown in FIG. 13, the voussoir 610' has when seen
from below a T-shaped cross section including two rectilinear profiles 616
butted
against the wall in the shape of an arch portion 611. When a voussoir 610' is
mounted in
the tank, the two rectilinear profiles 616 bear laterally against the upper
wall of the tank
in order to support it.
In FIG. 14, the reinforcing means 600' also comprises a beam 700 secured to
two opposite sides of the tank at the level of the belt 400. By being joined
to two sides
of the tank, this beam reinforces the structure of the latter.
In FIG. 15, the beam 700 is respectively provided at its two ends with two end
pieces 710 capable of being secured in the belt of the tank. The beam 700 also
comprises a plate 720 which protrudes downwards so as to be able to bear
against the
bottom of the tank in order to reinforce the structure thereof and to delimit
two
compartments in which two volumes of the filtration means are placed.
The beam may also support a tilting trough (not shown) capable of alternately
pouring a constant quantity of effluent into one or the other compartment.
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Returning to FIG. 14, 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 of
the tank so
that the beam can join this upper wall 202 and the bottom 310 of the tank in
order to
make the latter more rigid in the median plane in which the beam is installed.
The
plate 720 is perforated so as to limit the quantity of material necessary for
the
manufacture thereof and so that the two compartments can communicate.
It will be noted in FIG. 10 that this beam 700 also makes it possible to
support
the elements of a possible means 120 of distributing the effluent across the
filtration
means.
The reinforcing means 600' of this variant embodiment of the infiltration tank
may in one embodiment (not shown) be used on the tank provided with an outlet
orifice,
and vice versa.
The use of the two types of tanks of the invention refers to a use buried in
the
ground. Where appropriate, they may be used by being placed on the ground for
specific applications.
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