Field of the invention
[0001] The present invention relates to a structure of waste water well of plastic material.
Description of the prior art.
[0002] Waste water wells are known, i.e. for black water and soapy water, used as collecting
reservoirs, expansion reservoirs, but also as connection receptacles for sewer systems.
[0003] The waste water wells of known type have box-like shape and are made of concrete,
of fiberglass reinforced plastic, or of moulded plastic material.
[0004] While waste water wells in concrete have the drawback of having a high weight that
requires a complex and difficult installation, and fo this reason then they are used
only when high resistance against mechanical actions is required, waste water wells
of plastic material are widespread on the market even if they cannot be used in case
resistance against high mechanical actions is required, such as resistance to walking
and vehicle transit, since they are not capable of assuring enough mechanical resistance.
[0005] Among waste water wells of plastic material some wells are adapted to be easily connected
to ducts of different diameter. More in detail, on the sides of the box-like portion
of a waste water well tubular concentric portions of different diameter are provided.
This way, waste water wells have a certain flexibility since they can be connected
to the sewer network system simply connecting at the side surface of the waste water
well on a tubular portion having diameter corresponding to that of the duct to which
it has to be connected, and cutting away the tubular portions of smaller diameter.
[0006] However, this solution can cause the solid material to deposit in the waste water
well. The apertures made on the surface of the waste water well for connecting it
to the network via the inlet and outlet ducts are, in fact, arranged at different
heights. Therefore, the flow of the liquid between the inlet and outlet ducts of the
waste water well meeting different levels that are created inside causes the solid
material to deposit in determined points. This phenomenon is further enhanced by the
box-like structure of the waste water well.
[0007] Therefore, a maintenance treatment is required periodically for removing manually
the solid material that, by accumulating in the waste water well, can cause it to
jam and then to affect its correct operation.
Summary of the invention
[0008] It is then a feature of the present invention to provide a waste water well to prevent
solid material to stop inside it in order to reduce the necessary number of maintenance
treatments.
[0009] It is another feature of the present invention to provide a waste water well capable
of bearing high mechanical actions in order to improve its resistance to walking and
vehicle transit actions.
[0010] It is still a feature of the invention to provide a waste water well easily assemblable
and cheap with respect to the prior art.
[0011] These and other features are accomplished with one exemplary structure of a waste
water well, according to the present invention, comprising:
- a hollow body of thermoplastic material having a base, a side surface and a opening
on the surface opposite to said base,
- at least one plurality of inlet ducts and at least one plurality of outlet ducts for
the waste water, said ducts protruding outside from said side surface and being arranged
in such a way that the duct of larger diameter encircles the ducts of smaller diameter,
- a cover suitable for sealably coupling with said hollow body at said opening,
whose main feature is that the ducts of each plurality are arranged close to each
other at a respective generatrix close to the base of the hollow body.
[0012] Preferably, the inlet ducts and the outlet ducts of the waste water consist of two
respective pluralities of ducts of different diameter having a lowest generatrix substantially
at a same distance to the base of the hollow body, said distance being the same for
said inlet and outlet ducts.
[0013] Preferably, the hollow body and the pluralities of inlet and outlet ducts are made
as a single part obtained for injection moulding.
[0014] In particular, the ducts of each plurality can be arranged in such a way that the
respective lowest generatrix close to the base of the hollow body that are coincident
to one another. In this case, the different ducts are arranged all at a same distance
from the base of the hollow body. This simplifies remarkably the flow of the waste
water towards/away from the hollow body and avoids any accumulation of solid material
inside.
[0015] Advantageously, the cover and the hollow body have mutual engagement means. For example,
the cover at the surface that in use is oriented towards the hollow body has a projection
adapted to couple with the inner side face of the hollow body.
[0016] Preferably, between the projection of the cover and the hollow body tightness elements
are arranged, for example seals.
[0017] In particular, the inner side face of the hollow body has at least one support on
which the projection of the cover abuts.
[0018] According to another aspect of the invention a waste water well comprises:
- a hollow body of thermoplastic material having a base, a side surface and an opening
on the surface opposite to said base,
- at least one plurality of inlet ducts and at least one plurality of outlet ducts for
the waste water, said ducts protruding outside from said side surface and being arranged
in such a way that the duct of larger diameter encircles the ducts of smaller diameter,
- a cover suitable for sealably coupling with said hollow body at said opening,
whose main feature is that said cover has a portion protruding beyond the side surface
of the hollow body, said portion resting in use on a support, for example a concrete
casting, in order to load on it large part of the mechanical actions to which the
waste water well is subject.
[0019] In particular, the cover can comprise:
- a portion engaging with the hollow body,
- a stiff portion adapted to couple with the embracing portion and comprising:
- a plurality of circumferential concentric ribs that start from the central portion
of the cover become less frequent towards the periphery,
- a plurality of radial ribs connecting two next circumferential ribs.
[0020] In particular, two next circumferential ribs have a ratio between the respective
diameters set between 1.2 and 2.5, advantageously set between 1.4 and 2.0, preferably
between 1.6 and 1.8. This way, the circumferential ribs are concentrated in the central
portion of the cover and become less frequent towards the periphery. This gives a
higher mechanical resistance at the central portion of the cover where, in the presence
of mechanical actions, in particular, pushing actions, the maximum flexion is recorded.
[0021] In particular, the hollow body may have a cylindrical shape, or alternatively, polyedric
shape. In the latter case, the hollow body, at the inner side surface, has beveled
edges suitable to assist the outflow of the waste water treated from the recess of
said hollow body.
[0022] In particular, the cover can be connected to the hollow body by an interposition
duct adapted to engage with said cover and with said hollow body at the end.
Brief description of the drawings.
[0023] The invention will be made clearer with the following description of an exemplary
embodiment thereof, exemplifying but not limitative, with reference to the attached
drawings wherein:
- Figure 1 shows an exploded perspective view of a first exemplary embodiment of a structure
of waste water well, according to the invention;
- Figure 2 shows a perspective view of the structure of waste water well of figure 1
in an assembled configuration;
- Figure 3 shows a perspective view of an exemplary embodiment of the structure of waste
water well of figure 1 in operative conditions;
- Figure 4 shows in an elevational side view the structure of waste water well of figure
3 in operative conditions;
- Figure 5 shows an exploded perspective view of a possible exemplary embodiment of
a cover of waste water well as shown in figure 1;
- Figure 6 shows a perspective view from below of an element, and precisely the embracing
portion, of the cover of figure 5;
- Figure 7 shows a top plan view of an element, and precisely the stiff portion, of
the cover of figure 5;
- Figure 8 shows in a elevational side view of the cover of figure 5;
- Figure 9 shows a perspective view of an exemplary embodiment of the hollow body of
figure 1;
- Figure 10 shows a perspective view from below of the hollow body of figure 10.
Description of an preferred exemplary embodiments.
[0024] With reference to figure 1, a waste water well 1, according to the present invention,
comprises a hollow body 2 and a cover 10, which are made of thermoplastic material
and are adapted to sealingly couple to each other. Hollow body 2 comprises a base
6 and a side surface 4 from which four pluralities of ducts protrude 3a-3d having
different diameter. In particular, each plurality comprises ducts 3a-3d of different
diameter arranged in such a way that the element of larger diameter 3d encircles those
of smaller diameter 3a-3c.
[0025] In particular, the tubular elements 3a-3d of each plurality are arranged according
to result close to one another, or overlapped, at a respective generatrix close to
base 6. More in detail, the different pluralities, and therefore the respective ducts
3a-3d, are arranged at a same distance from base 6. This particular arrangement allows
a high flexibility, for the presence of ducts of different diameter, as well as an
optimal efficiency of operation. In operative conditions, the flow of treated waste
water does not meet obstacles, i.e. different heights, between the inlet ducts and
the outlet ducts, and can then outflow freely from the waste water well 1.
[0026] To avoid an accumulation of solid material dragged by the current of waste water,
hollow body 2 may have cylindrical shape (figure 1) or, alternatively, polyedric shape
with beveled edges at the inner side face (figures 9 and 10).
[0027] When assemblng the waste water well 1, the surface 4 of hollow body 2 is cut at each
plurality of tubular elements, for removing the tubular elements of smaller diameter
than the desired diameter.
[0028] For example, in the case shown in figure 3, waste water well 1 is connected by means
of inlet ducts 80-82 to three different users at the plurality 3'-3''' of ducts. The
waste water flow then from waste water well 1 towards the sewer network system through
a duct 83 connected to hollow body 2 at the plurality of ducts 3
iv.
[0029] Also in case of ducts 80-83 of different diameter, the particular arrangement of
tubular elements 3a-3d allows to arrange the ducts 80-83 substantially on a same plane
α (figure 4).
[0030] The cover 10 and hollow body 2 are coupled through mutual engagement means. For example,
cover 10, at surface 12 that in use is oriented towards hollow body 2, has a projection
35 adapted to couple with the inner side face of hollow body 2. A seal 5 connecting
hollow body 2 and the projection 35 ensures then the necessary tightness between the
two bodies.
[0031] In case of a hollow body 2 of cylindrical shape, the projection 35 of the cover 10
is, in use, arranged abutting on supports 7, for example 4 arranged at 90°, protruding
towards the inside of waste water well 1 starting from the inner surface of hollow
body 2.
[0032] In the case, instead, of hollow body 2' with polyedric shape, at an end that adapted
to couple with the cover a containing neck 14 can be provided. More in detail, the
walls 17 of hollow body 2' protrude from the neck 14 towards the inside of the waste
water well 1, whereby the projection 35 of the cover 10 can abut on them.
[0033] As shown in detail in figure 4, the cover 10 has a portion 13 that extends beyond
the side surface 4 of hollow body 2. In particular, portion 13 in use is arranged
on a support, for example a concrete casting 100, on which large part of the mechanical
actions are loaded to which the waste water well is subject 1. Therefore, it is not
necessary to provide particular stiffening structure for base 6 of hollow body 2.
This remarkably simplifies the production process for hollow body 2 and, in particular,
the shape of the mould from which it is obtained.
[0034] If waste water well 1 is installed at high depth, the cover 10 is connected to the
body 2 by a duct 85. More in detail, the duct 85 at its end has mutual engagement
means with the cover 10 and with hollow body 2.
[0035] In a particular exemplary embodiment of the invention, the cover 10 is made of two
parts (figure 5). In detail, it comprises a portion 30 of engagement with hollow body
2, and a stiffening portion 20 adapted to couple with it, for example with a click
engagement. Between engagement portion 30 and stiffening portion 20 a seal 15 is arranged.
[0036] Stiff portion 20 at the surface that faces portion 30 is equipped with a plurality
of circumferential concentric ribs, for example 5 51-55, concentrated at the central
portion of the cover 10 and more sparse towards the periphery. In particular, two
next circumferential ribs 51-52, 52-53, 53-54 and 54-55 have a ratio between the respective
diameters set between 1.2 and 2.5, for example 1.8. this gives a higher mechanical
resistance at the central portion of cover 10 where in the presence of mechanical
actions, in particular, pushing actions, the maximum flexion is recorded (figure 8).
Between two next circumferential ribs 51-55 furthermore, a plurality of radial ribs
60 is provided.
[0037] Finally, in an exemplary embodiment not shown in the figures, hollow body 2 has inside
a shaped surface suitable to assist the outflow of the waste water treated by the
waste water well 1.
[0038] The foregoing description of a specific embodiment will so fully reveal the invention
according to the conceptual point of view, so that others, by applying current knowledge,
will be able to modify and/or adapt for various applications such an embodiment without
further research and without parting from the invention, and it is therefore to be
understood that such adaptations and modifications will have to be considered as equivalent
to the specific embodiment. The means and the materials to realise the different functions
described herein could have a different nature without, for this reason, departing
from the field of the invention. It is to be understood that the phraseology or terminology
employed herein is for the purpose of description and not of limitation.
1. Structure of waste water well comprising:
- a hollow body of thermoplastic material having a base, a side surface and an opening
on the surface opposite to said base,
- at least one plurality of inlet ducts and at least one plurality of outlet ducts
for the waste water, said ducts protruding outside from said side surface and being
arranged in such a way that the duct of larger diameter encircles the ducts of smaller
diameter,
- a cover suitable for sealably coupling with said hollow body at said opening,
characterised in that said ducts of each plurality ducts are arranged close to each other at a respective
generatrix close to the base of said hollow body.
2. Structure of waste water well, according to claim 1, wherein said inlet ducts and
said outlet ducts of the waste water of said respective plurality have a lowest generatrix
substantially at a same distance to the base of the hollow body, said distance being
the same for said inlet and outlet ducts.
3. Structure of waste water well, according to claim 1, wherein said hollow body comprising
said plurality of ducts is made of a single part obtained for injection moulding.
4. Structure of waste water well, according to claim 1, wherein said cover and said hollow
body have mutual engagement means.
5. Structure of waste water well, according to claim 1, wherein between said cover and
said hollow body tightness elements are arranged.
6. Structure of waste water well comprising:
- a hollow body of thermoplastic material having a base, a side surface and an opening
on the surface opposite to said base,
- at least one plurality of inlet ducts and at least one plurality of outlet ducts
for the waste water, said ducts protruding outside from said side surface and being
arranged in such a way that the duct of larger diameter encircles the ducts of smaller
diameter,
- a cover suitable for sealably coupling with said hollow body,
characterised in that said cover has a portion protruding from said side surface of said hollow body, said
protruding portion resting in use on a support.
7. Structure of waste water well, according to one among claims 1 and 6, wherein said
cover comprises:
- a portion engaging with said hollow body,
- a stiff portion adapted to couple with said protruding portion and comprising:
- a plurality of circumferential concentric ribs that start from the central portion
of said cover and become less frequent towards the periphery,
- a plurality of radial ribs connecting two next circumferential ribs.
8. Structure of waste water well, according to claim 7, wherein two next circumferential
ribs have a ratio between the respective diameters set between 1.2 and 2.5, advantageously
set between 1.4 and 2.0, preferably set between 1.6 and 1.8.
9. Structure of waste water well, according to one among claims 1 and 6, wherein said
hollow body has cylindrical shape.
10. Structure of waste water well, according to one among claims 1 and 6, wherein said
hollow body has polyedric shape and has, at the inner side surface, beveled edges
suitable to assist the outflow from the recess of said hollow body of the waste water
treated.
11. Structure of waste water well, according to one among claims 1 and 6, wherein said
hollow body is connected to said cover by an interposition duct.