PLASTIC PLATE FOR LINING CONCRETE COMPONENTS

PLAQUE DE PLASTIQUE CONCUE POUR RECOUVRIR DES COMPOSANTS EN BETON

English Abstract

The invention relates to a plastic plate for lining concrete components
through which a fluid medium flows. Said plastic plate is provided with a
plurality of anchor elements (10) which are mounted on the side (1B) thereof
oriented towards the concrete component wall and which make it possible to
positively fixe said plastic plate to the concrete component. The side (1A) of
the plastic plate oriented to a medium is provided with a plurality of
adjacent flow elements (4) which are embodied in the form of elevated
structures comprising an upstream flank (4A) oriented in a flow direction (9)
and an oppositely oriented downstream flank (4B), wherein the superficial
areas located between the flow elements are smoothly shaped. In such a manner,
it makes it possible to increase a dragging effect of medium-carried particles
in order to avoid solid deposits even at a low flowrate. In the preferred
embodiment, the flow elements are constructed in the form of narrow webs which
have a wedge-shaped cross section and are distributed in individual rows (IV)
side by side transversally to the longitudinal axis (5) of the plastic plate.

French Abstract

La présente invention concerne une plaque de plastique conçue pour recouvrir des composants en béton qui sont traversés par un milieu fluide. Cette plaque de plastique présente sur la face (1B) tournée vers la paroi du composant en béton une pluralité d'éléments d'ancrage (10) qui permettent de relier la plaque de plastique au composant en béton par liaison de forme. Sur la face (1A) tournée vers le milieu, la plaque de plastique présente une pluralité d'éléments d'écoulement adjacents (4) qui sont conçus sous forme de structures en saillie présentant un flanc en amont (4A) orienté dans le sens d'écoulement (9) et un flanc en aval (4B) orienté dans le sens inverse du sens d'écoulement. Les zones superficielles situées entre les éléments d'écoulement sont lisses. Il est ainsi possible d'augmenter l'action de dragage des particules entraînées dans le milieu, de manière à empêcher les dépôts de matières solides même avec une faible vitesse d'écoulement. Dans un mode de réalisation préféré, les éléments d'écoulement sont conçus sous forme de nervures étroites présentant une section transversale cunéiforme, qui sont réparties en lignes individuelles (IV) les unes à côtés des autres, transversalement à l'axe longitudinal (5) de la plaque de plastique.

Claims

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CLAIMS:
1. A plastic plate for lining concrete components through which a flowable
medium flows, wherein the side of the plastic plate facing the wall of the
concrete component
has a plurality of anchoring elements, so that the plastic plate can be
connected in a form-fit
manner to the concrete component,
wherein
the side of the plastic plate facing the medium has a plurality of flow
elements arranged
beside one another, which are embodied as raised structures with an upstream
flank pointing
in the flow direction and a downstream flank pointing against the flow
direction, wherein the
surface areas of the plastic plate lying between the flow elements are smooth,
so that the
entrainment effect of particles carried along in the medium is increased,
the flow elements are embodied as elongated raised portions, and
the longitudinal axes of the flow elements embodied as elongated raised
portions form an
angle of 30 to 600, preferably 40 to 500, in particular approx. 45°,
with the longitudinal axis of
the plastic plate.
2. The plastic plate according to claim 1, wherein the upstream flanks of
the flow
elements pointing in the flow direction are steeper than the downstream flanks
pointing
against the flow direction.
3. The plastic plate according to claim 1 or 2, wherein the upstream flanks
of the
flow elements pointing in the flow direction form an angle of 70 to 90°
with the smooth
surface areas of the plastic plate.
4. The plastic plate according to claim 1 or 2, wherein the upstream flanks
of the
flow elements pointing in the follow direction form an angle of 80 to
90° with the smooth
surface areas of the plastic plate.

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5. The plastic plate according to claim 1 or 2, wherein the upstream flanks
of the
flow elements pointing in the follow direction form an angle of approximately
90° with the
smooth surface areas of the plastic plate.
6. The plastic plate according to any one of claims 1 to 5, wherein the
downstream flanks of the flow elements pointing against the flow direction
form an angle of
30 to 60° with the smooth surface areas of the plastic plate.
7. The plastic plate according to any one of claims 1 to 5, wherein the
downstream flanks of the flow elements pointing against the follow direction
form an angle of
40 to 50° with the smooth surface areas of the plastic plate.
8. The plastic plate according to any one of claims 1 to 5, wherein the
downstream flanks of the flow elements pointing against the follow direction
form an angle of
approximately 45° with the smooth surface areas of the plastic plate.
9. The plastic plate according to any one of claims 1 to 8, wherein the
plastic
plate is divided into two halves, the flow elements being arranged in a mirror-
inverted fashion
on the two halves.
10. The plastic plate according to any one of claims 1 to 9, wherein the
flow
elements are arranged beside one another in individual rows in each case on a
common axis.
11. The plastic plate according to any one of claims 1 to 10, wherein the
spacing
between the flow elements on a row is smaller than the length of the flow
elements.
12. The plastic plate according to any one of claims 1 to 11, wherein the
common
axes on which the flow elements are arranged form an angle of 30 to
60°, with the longitudinal
axis of the plastic plate.
13. The plastic plate according to any one of claims 1 to 11, wherein the
common
axes on which the flow elements are arranged from an angle of 40 to 50°
with the longitudinal
axis of the plastic plate.

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14. The plastic plate according to any one of claims 1 to 11, wherein the
common
axes on which the flow elements are arranged from an angle of approximately
45° with the
longitudinal axis of the plastic plate.
15. The plastic plate according to any one of claims 1 to 14, wherein the
flow
elements embodied as elongated raised portions taper to a point at the ends.
16. The plastic plate according to any one of claims 1 to 15, wherein the
flow
elements embodied as elongated raised portions have a height of 2 to 8 mm.
17. The plastic plate according to any one of claims 1-15, wherein the flow
elements embodied as elongated raised portions have a height of 3 to 7 mm.
18. The plastic plate according to any one of claims 1-15, wherein the flow
elements embodied as elongated raised portions have a height of 4 to 6 mm.
19. The plastic plate according to any one of claims 1-15, wherein the flow
elements embodied as elongated raised portions have a height of approximately
5 mm.
20. The plastic plate according to any one of claims 1 to 19, wherein the
flow
elements embodied as elongated raised portions have a length of 20 to 140 mm.
21. The plastic plate according to any one of claims 1 to 19, wherein the
flow
elements embodied as elongated raised portions have a length of 40 to 120 mm.
22. The plastic plate according to any one of claims 1 to 19, wherein the
flow
elements embodied as elongated raised portions have a length of 60 to 100 mm.
23. The plastic plate according to any one of claims 1 to 19, wherein the
flow
elements embodied as elongated raised portions have a length of approximately
80 mm.
24. The plastic plate according to any one of claims 1 to 11, wherein the
flow
elements embodied as elongated raised portions have a width of 1 to 40 mm.
25. The plastic plate according to any one of claims 1 to 11, wherein the
flow
elements embodied as elongated raised portions have a width of 1 to 10 mm.

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26. The plastic plate according to any one of claims 1 to 11, wherein the
flow
elements embodied as elongated raised portions have a width of 5 mm.
27. The plastic plate according to any one of claims 1 to 26, wherein the
anchoring
elements are embodied as splayed wing elements, which have support webs in
their foot
region.
28. The plastic plate according to claim 27, wherein the height of the
support webs
amounts to at least 70% of the height of the wing elements.
29. The plastic plate according to claim 27, wherein the height of the
support webs
amounts to at least 80% of the height of the wing elements.
30. The plastic plate according to any one of claims 27 to 29, wherein the
wing
elements have arc-shaped transition portions in their foot region.
31. The plastic plate according to any one of claims 27 to 30, wherein in
each case
two wing elements are arranged offset with respect to one another and are
connected to one
another by at least one support web.
32. The plastic plate according to any one of claims 1 to 31, wherein the
plastic
plate has welding edges, at which the sides of the plastic plate facing
towards and facing away
from the medium are smooth.
33. The plastic plate according to any one of claims 1 to 32, wherein the
plastic
plate comprises a sandwich structure with a first layer comprising the flow
elements and a
second layer comprising the anchoring elements.
34. The plastic plate according to claim 33, wherein the first and second
layer are
made from materials with one or more of different mechanical properties,
different chemical
properties and different optical properties.
35. An arrangement of plastic plates according to any one of claims 1 to
34,
wherein the plastic plates are connected to one another to form a body which
lines the
component.

Description

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WO 2006/111418 May 22, 2007
AGRU Kunststofftechnik GmbH A 1040
Plastic plate for lining concrete components
The invention relates to a plastic plate for lining concrete components, in
particular
concrete pipes, through which a flowable medium flows. Furthermore, the
invention relates to an arrangement of plastic plates for lining concrete
components.
For the purpose of lining concrete containers which contain liquid or gaseous
chemicals, plastic plates are known which protect the concrete against the
chemicals. Such plastic plates are repeatedly glued to the concrete component.
Since the smooth surface of the plastic plates does not, however, enter into a
firm
mechanical connection with the concrete, there is a risk of the plastic plates
becoming detached in the course of time.
There are known from WO 01/57340 Al plastic plates which comprise a plurality
of
anchoring elements on the side facing the concrete component, said anchoring
elements entering into a form-fit connection with the concrete during
concreting.
The anchoring elements are embodied as splayed wing elements which have
support
webs in their foot region.
The plastic plates with anchoring elements known from WO 01/57340 Al have
been tried and tested in practice for the lining of concrete containers which
need to
be protected against chemicals. Pipelines which convey a flowable medium, i.e.
a
liquid or gaseous medium, could in principle also be lined with the known
plastic
plates.

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In order to offer the least possible resistance to the medium, an attempt is
made in
principle to design the surface of the lining as smooth as possible. The
drawback,
however, is that solid bodies which are contained in the medium can become
deposited in the course of time at the pipe wall, especially in the region of
pipe
bends and branches as well as in sections with a reduced or widened cross-
section.
The deposits number among the typical damage patterns, especially in mixed
sewage systems which are subjected to extreme fluctuations in the flow volume.
There is known from EP 1 194 712 B1 a pipeline whose wall has a structured
surface, which comprises a plurality of parallelepiped- or pyramid-shaped
raised
portions. It has been shown that with the structured surface a boundary layer
is
formed at the pipe wall, the effect of which is that the capacity for
entraining
particles carried along in the medium is increased. The tendency for particles
to
adhere to the wall is accordingly greatly reduced. This effect is generally
referred to
as an increase in the entrainment effect of the particles carried along in the
medium.
EP 1 194 712 B1 proposes either providing the wall of the pipe with the
structured
surface or pulling into the pipe a tubular stretched film or plate insert
which is glued
to the pipe.
The problem underlying the invention is to line in a straightforward manner
concrete components of differing design through which a flowable medium flows,
in such a way that the concrete components are protected against aggressive
media,
without the risk of particles contained in the media becoming deposited at the
wall
of the concrete components.
In order to line the concrete components, use is made according to the
invention not
of a tubular film or plate insert, but of plastic plates which are connected
to one

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another to form a body which lines the component. Since the plastic plates
have a
sufficient flexibility, there is the possibility of lining not only
rectangular, but also
tubular concrete components. After the insertion of the plastic plates into
the
concrete component, the plates are preferably welded together.
The plastic plate according to the invention has on the side facing the medium
a
plurality of flow elements arranged beside one another, which are embodied as
raised structures with an upstream flank pointing in the flow direction and a
downstream flank pointing against the flow direction, wherein the surface
areas
lying between the flow elements are smooth. The entrainment effect of
particles
carried along in the medium is thus increased even at low flow rates and with
a
discontinuous operation. On the side facing away from the medium, the plastic
plate has a plurality of anchoring elements, so that the plastic plate can be
connected
in a form-fit manner to the concrete component.
It has been shown in numerous tests that the entrainment effect of the
particles
carried along in the medium can be increased if the raised structures offer a
certain
resistance to the flowable medium. This is achieved by the fact that the
raised
structures are embodied by an upstream flank pointing in the flow direction
and a
downstream flank pointing against the flow direction. This effect occurs
especially
when the flanks of the flow elements pointing in the flow direction are
steeper than
the flanks pointing against the flow direction. The flow elements thus exhibit
a
wedge-shaped cross-section. It has proved to be advantageous if the upstream
flanks of the flow elements pointing in the flow direction form an angle of 70
to
90 , preferably 80 to 90 , in particular approx. 90 , with the smooth surface
areas of
the plastic plate The downstream flanks of the flow elements pointing against
the
flow direction preferably form an angle of 30 to 600, also preferably 40 to 50
, in
particular approx. 45 , with the smooth surface areas of the plastic plate.
In a preferred embodiment, the plastic plate is divided into two halves, the
flow
elements being arranged in a mirror-inverted fashion on the two halves. The
flow

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.
elements are preferably arranged beside one another in individual rows in
each case
on a common axis. It has proved to be advantageous for the distance between
the
flow elements on a row to be smaller than that of the length of the flow
elements.
In another preferred embodiment, the flow elements are embodied as elongated
raised portions. Elongated raised portions are understood to mean raised
portions
which have an extension in the longitudinal direction that is a multiple of
the
extension in the transverse direction. The flow elements embodied as elongated
raised portions preferably taper to a point at the ends. It is however also
possible for
the flow elements to be rounded off at the ends.
It has been shown in tests that a particularly great entrainment effect can be
achieved if the longitudinal axes of the flow elements embodied as elongated
raised
portions form an angle of 30 to 600, also preferably 40 to 50 , in particular
approx.
45 , with the longitudinal direction of the plastic plates, which runs in the
flow
direction of the flowable medium. The elongated raised portions are preferably
arranged in individual rows in each case on a common axis, the plastic plates
preferably being divided into two halves on which the flow elements are
arranged in
a mirror-inverted fashion. A rib-shaped surface structure with narrow webs is
thus
created, wherein the axes on which the elongated raised portions lie run
obliquely to
the flow direction.

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4a
In accordance with this invention, there is provided a plastic plate for
lining concrete
components through which a flowable medium flows, wherein the side of the
plastic plate
facing the wall of the concrete component has a plurality of anchoring
elements, so that the
plastic plate can be connected in a form-fit manner to the concrete component,
wherein the
side of the plastic plate facing the medium has a plurality of flow elements
arranged beside
one another, which are embodied as raised structures with an upstream flank
pointing in the
flow direction and a downstream flank pointing against the flow direction,
wherein the surface
areas of the plastic plate lying between the flow elements are smooth, so that
the entrainment
effect of particles carried along in the medium is increased, the flow
elements are embodied as
elongated raised portions, and the longitudinal axes of the flow elements
embodied as
elongated raised portions form an angle of 30 to 600, preferably 40 to 50 , in
particular
approx. 45 , with the longitudinal axis of the plastic plate.
An example of embodiment of the invention is explained in detail below by
reference to the
drawings.

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In the figures:
Fig. 1 shows a cutout of a plastic plate according to the invention in plan
view,
Fig. 2 shows a section through the plastic plate from fig. 1 along line A-A in
an
enlarged representation,
Fig. 3 shows a section through the plastic plate from fig. 1 along line B-B in
an
enlarged representation,
Fig. 4 shows an enlarged cutout of the plastic plate from fig. 1 in plan view,
Fig. 5 shows a side view of adjacent anchoring elements of the plastic plate
from
fig. 1 in an enlarged representation and
Fig. 6 shows on enlarged cutout of the plastic plate from fig. 1 in a view
from
beneath.
Fig. 1 shows a cutout of the plastic plate according to the invention in plan
view.
The plastic plate is made of a thermoplastic material, in particular PVC, PE,
PP,
PVDF and ECTFE. The thickness of the plastic plate amounts to 1 to 5 mm,
preferably 2 to 4 mm, so that on the one hand it exhibits sufficient strength,
but on
the other hand also sufficient flexibility for bending. In the example of
embodiment, the plate is 2 mm thick. It can be made available as a strip
material in
different lengths.
The plastic plate has at side lA facing the medium a region 1 with a
structured
surface, which is adjoined on both sides by non-structured smooth regions 2,
which
verge into smooth welding edges 3 at the upper and lower side. The surface
structure, which occupies the major part of the total surface of the plastic
plate, is

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embodied by a plurality of flow elements 4 which are each arranged beside one
another in individual rows IV.
Flow elements 4 are embodied as elongated raised portions, which taper to a
point at
the ends. They form narrow webs which are in one piece with the plastic plate.
The
narrow webs have a height of 2 to 8 mm, preferably 3 to 7 mm, also preferably
4 to
6 mm. In the example of embodiment, the narrow webs have a height a of approx.
5
mm. The webs have a length b of 20 to 140 mm, also preferably 40 to 120 mm,
also
preferably 60 to 100. In the example of embodiment, the narrow webs have a
length
of 85 mm. They preferably have a width c of 1 to 40 mm. The width of the webs
is
approx. 5 mm in the example of embodiment.
Region 1 with the structured surface is divided into a left-hand half l' and a
right-
hand half 1". Narrow webs 4 are orientated in the left-hand and right-hand
half in a
mirror-inverted fashion with respect to longitudinal axis 5 of the plastic
plate.
Longitudinal axes 6 of all the webs form an angle a of 30 to 60 , preferably
50 to
45 , with longitudinal axis 5 of the plastic plate, which corresponds to the
flow
direction of the medium. The angle is approx. 45 in the example of
embodiment.
The longitudinal axes of webs 4 arranged in each case in a row IV lie on a
common
axis. Spacing d of webs 4 lying on common axis 6 is smaller than length b of
the
webs. Spacing e between individual rows IV of the webs is smaller than length
b of
the webs, but larger than spacing d between the webs.
Webs 4 arranged in left-hand and right-hand half l', 1" of the plastic plate
are
orientated in such a way that they point in flow direction 9. The webs each
have an
upstream flank 4A pointing in flow direction 9 and a downstream flank 4B
pointing
against the flow direction. The decisive factor is that flank 4A pointing in
the flow
direction is steeper than the flank pointing against the flow direction. In
this regard,
the webs have a wedge-shaped cross-section. In the example of embodiment,
flanks
4A of the webs pointing in the flow direction form an angle of approx. 90
with the

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surface of the plastic plate. Flanks 4B of webs 4 pointing against the flow
direction
form an angle of approx. 45 with the surface of plastic plate 1 in the
example of
embodiment. Flanks 4A pointing in the flow direction terminate at the foot
point in
a small radius, whereas flanks 4B pointing against the flow direction end in a
sharp
edge (fig. 3).
Rear side 1B of the plastic plate facing the concrete component is described
below
by reference to figs. 5 and 6. At the rear side, plastic plate 1 has, except
in the
region of welding edges 3, projecting anchoring elements 10 which are in one
piece
with the plastic plate. The anchoring elements located solely at the rear side
of the
plate are represented in outline in fig. 1. Anchoring elements 10 are embodied
in
each case as two splayed wing elements 11, 12, which are connected to one
another
by a support web 13. Wing elements 11, 12 transform continuously at the foot
point
in an arc 14 into the plastic plate. A relatively wide connection area of the
wing
elements with the plastic plate thus results. The height of support webs 13
amounts
to at least 70%, preferably at least 80%, of the height of the wing elements.
The
wing elements in each case forming an anchoring element 10 are arranged offset
with respect to one another.
The embodiment of anchoring elements 10 at the rear side of plastic plate 1 is
described in detail in WO 01/57340 Al, to which reference is expressly made
for
the purpose of the disclosure.
The plastic plate is a co-extruded plate, which comprises a sandwich structure
with a
first layer comprising the flow elements (4) and a second layer comprising the
anchoring elements (9). The first and second layer are made from materials
with
different mechanical and/or chemical and/or optical properties. The first
layer with
flow elements 9 is made from a coloured plastic material, whereas the second
layer
with the anchoring elements is made from a non-coloured plastic material. It
is
therefore possible in a straightforward manner to monitor optically the wear
on the
first layer coming into contact with the medium. Thus, on the basis of the
colour, it

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can be detected whether the first layer has been worn away. This monitoring
can
take place with a camera. Furthermore, the plastic material of the first layer
is more
abrasion-resistant than the material of the second layer.
For the lining of concrete components, in particular concrete pipes, the
individual
plastic plates are placed into the formwork of the concrete pipe and welded at
their
welding edges 3 to form a tubular lining. During concreting, the plastic
plates are
connected to the concrete component in a form-fit manner by means of anchoring
elements 10. An increased long-term strength is achieved by this anchoring.
Flow
elements 4 at the inside of the tubular lining increase the entrainment effect
of the
particles carried along in the medium and thus prevent the formation of
deposits at
the inner side of the pipe.
The decisive advantage of the plastic plate according to the invention lies in
the fact
that concrete components can be lined cost-effectively in a straightforward
manner,
a high long-term strength and entrainment effect being achieved. It should be
noted
that the increase in the entrainment effect with the preferred embodiment of
the flow
elements has its own inventive significance. This is because it would in
principle
also be possible to fix the plastic plates to the concrete component in a
different
manner from that with the anchoring elements. The increased long-term strength
would not then be produced, but the advantage of the increased entrainment
effect
would take effect.

Representative Drawing