Note: Descriptions are shown in the official language in which they were submitted.
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Joint strip
Technical field
The invention is based on a joint strip as in the
preamble of the first claim.
Prior art
Joint strips have been known for a long time, for
sealing joint structures in the construction sector.
For this, the joint strip is, for example, arranged in
the region of the joint to be produced. For sealing,
the "outside" joint strip has webs which extend into
the region of the adjacent concrete structure or which
are bonded into the concrete matrix. In order to make
the joint more leakproof or, if water can penetrate
around the webs, to seal these subsequently, it is also
known that injection tubes can be integrated into the
joint strip. However, there is disagreement among
experts as to whether tubes integrated during
manufacture, e.g. at the top of the web, can fulfill
the desired function, and there is an attendant risk,
for example, of buckling during rolling of the joint
strips with the possibility of a resultant defect.
These molded-on injection tubes are moreover not
suitable for ventilation purposes.
An alternative method therefore adopted is subsequent
installation, between the webs of the joint strip, of
certified injection tubes capable of fulfilling the
required function. This is variously achieved with
point fixing by metal clips, adhesive bonding for
example by hot melt, welding, tapes, lugs, etc.
However, the point fixing generates a risk of
positional shift by virtue of the mechanical effects of
the concrete, or uncontrolled movement caused by the
air present in the tube, reducing the usefulness of the
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injection tubes. The abovementioned securing methods
are moreover very tedious and complicated for users.
Brief description of the invention
The invention is based on the object of avoiding the
abovementioned disadvantages in a joint strip of the
type mentioned in the introduction, and providing a
reliable and simple system for securing the injection
tubes.
According to the invention, this is achieved by the
features of the first claim.
The core of the invention is therefore that at least
one retaining web has been arranged on the joint strip
and serves for retaining a further sealing means.
The advantages of the invention are inter alia that the
entire length of the injection tubes has in essence
been fixed, thus eliminating any positional shift
during use. The installation of the tubes is very
simple, and users cannot make any errors when securing
the tubes during installation. The additional webs for
securing the tubes moreover improve the functioning of
the joint strip, since they increase the distance that
water has to travel. The additional costs for the
additional webs are minimal, since firstly previous
extruder tooling can be adapted very easily and
secondly the additional materials costs arising are
only minimal.
The dependant patent claims give further advantageous
embodiments of the invention.
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Brief description of the drawing
Inventive examples are explained in more detail below,
using the drawings. The same reference numerals are
used for the same elements in the various figures.
Fig. 1 shows a partial cross section through an
inventive joint strip;
Fig. 2 shows a partial cross section through a
further inventive joint strip for receiving
tubes with different cross sections;
Fig. 3 shows a partial cross section through a
further inventive joint strip which can be
adapted for receiving tubes with different
cross sections;
Fig. 4 shows the joint strip of fig. 3 with tubes
with different cross sections installed;
Fig. 5 shows a partial cross section through a
further inventive joint strip with
alternative retaining webs;
Fig. 6 shows a partial cross section through a
further inventive joint strip with further
alternative retaining webs;
Fig. 7 shows a partial cross section through a
further inventive joint strip with further
alternative retaining webs which have been
arranged on the webs.
Only ttube elements essential for fundamental
understanding of the invention have been shown.
Methods for carrying out the invention
Fig. 1 is a diagram of a joint strip 1 which comprises
a strip 2 and a plurality of webs which have
advantageously been molded onto the strip 2. The first
webs 3 serve to increase the distance that water has to
travel, thus sealing the joint. The webs 3
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advantageously have projecting parts 4 which serve for
more secure placement in the building and serve for
sealing because water has to travel a greater distance.
The joint strips are used in a known manner, for
example for sealing working joints. These are produced
by division of the building into concrete sections,
although continuous reinforcement here usually provides
a friction-based bond between the sections. Joint
strips are usually composed of PVC-P, PVC/NBR, or mod.
PE, or various types of elastomers.
According to the invention, retaining webs 5 have now
been arranged on the strip 2 and serve to retain an
injection tube of further sealing materials, such as
swell strips or the like. In the embodiment of fig. 1,
the retaining webs 5 likewise have projecting parts 6,
wtube function is the same as that of the projecting
parts 4 of the webs 3 but however also serve for
reliable retention of the material to be retained. The
design of the retaining web 5 and the arrangement on
the strip and relative to the webs 3 is in essence
dependent on the shape of the tube or material to be
retained, in particular from the diameter of the tube,
but not on the nature of the tube used. The retaining
device can therefore retain any desired injection tubes
or materials. The retaining webs 5 advantageously run
over the entire length of the joint strip, but can also
have been designed so as to be discontinuous, a
precondition then being that reliable retention has
been provided.
These injection tubes should have a sufficient cross
section for good operability, and have sufficient
robustness for operations, and discharge of the
injection material from the tube system should be
possible even at low pressure within the concrete, and
the injection system should not bond excessively to the
concrete, since otherwise problems can arise when
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pressure is applied.
Various systems are used as injection tubes. For
example, there are perforated round PVC inner tubes
with double fabric sheathing, where the fine fabric of
the double-fabric sheathing inhibits penetration of wet
cement into the interior of the tube during the
concreting process (filter function); perforated or
slit round PVC inner tubes with slit foam rubber
sheathing, with an offset arrangement of the slits in
the sheathing with respect to the perforation of the
PVC inner tube; perforated round PVC inner tubes with
slit foil sheathing, with offset arrangement of the
slits in the foil sheathing with respect to the
discharge apertures of the inner tube; semicircular or
rectangular systems composed of plastics profiles or of
rubber profiles with injection channels; slit flat
tubes composed of PVC with no additional sheathing, the
intention being that the tube slits remain closed under
the pressure of the concreting process and do not open
until injection pressure is applied, thus inhibiting
penetration of wet cement during the concreting
process; flat tubes with a plurality of injection
channels, where each injection channel can be used
separately for an injection procedure (multiple
injection). The retaining webs are then naturally
adapted to the injection tubes to be used, but in
principle a large number of different injection systems
can be retained by using this invention.
Examples of injection materials which can be injected
into the injection tube are cement suspensions and wet
cements, polyurethane resins or polyurethane foams,
epoxy resins, acrylic resins, etc.
In fig. 2, a joint strip 1 has been formed with
retaining webs of different design, the retaining webs
having in essence a similar underlying shape. The
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retaining web 5 is in essence the same as ttube of
fig. 1, and the arrangement has a retaining web 7
which, in comparison with the retaining web 5, is
longer and further from the associated web 3. The
retaining web 7 can therefore securely retain an
injection tube 8 which is larger than the injection
tube 9 retained by the retaining web 5. Naturally, it
is not usual that two injection tubes are arranged on
one joint strip, and the joint strip shown in fig. 2
permits use of injection tubes of different shapes
without any requirement for change of the respective
joint strip. In the case of relatively wide joint
strips, it is naturally also possible to use further
shapes of retaining webs, thus permitting retention of
still further different injection tubes.
Figs 3 and 4 show another possibility for designing the
joint strips with retaining webs, to permit retention
of different injection tubes. For this, the retaining
webs 5 and 7 have been arranged next to one another,
and the shorter web 5 is therefore closer than the
longer web 7 to the associated web 3. In fig. 4, a tube
9 with relatively small diameter can then easily be
clamped between web 5 and web 3, and the retaining web
7 arranged adjacent thereto here then assumes merely
sealing functions. If the intention is to use a tube
with relatively large diameter, the web 5 is simply
removed and the tube can be retained by means of the
web 7.
Figs 5 and 6 show a further inventive form of the
retaining webs. One retaining web 10 here is at an
inclined angle with respect to the web 3, and fig. 5
shows this in comparison with the web 5 previously
shown. In fig. 6, the tube 9 is now easily pushed under
the angled web 10 and thus retained by the web. The
angle 11 here is selected in such a way that the tube
is reliably retained, and that the dependency of the
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retention system on the shape of the tube has been
minimized. The right-hand side of fig. 6 shows that the
system shown here can very easily also retain tubes of
another shape, since the web 10 is simply bent upward,
thus naturally reducing the angle of inclination 11.
Although the web 10 here is almost perpendicular to the
strip, the tube 8 is reliably retained, since the web
exerts pressure on the tube by means of the
resilient force produced by the deformation of the web.
10 The precise shape of the retaining web 10 therefore has
to be designed in such a way as to achieve sufficient
resilient force as a function of the material used for
the strip 1, but that the web 10 does not break away
from the strip. The retaining web 10 can naturally also
have projecting parts 6 by analogy with the retaining
webs 5 and 7, to improve retention.
In fig. 7, retaining webs 12 can also be arranged on
the webs 3, at right angles or at an angle 11, here
again thus permitting reliable retention of the
injection tubes. This arrangement and retention of the
injection tubes is analogous to that of fig. 5 and 6,
where the arrangement, however, has the retaining webs
10 on the strip 2. The retaining webs 12 here can, by
analogy with the retaining webs shown above, have
projecting parts 6 or extensions for improved retention
of the tubes.
The invention is, of course, not restricted to the
inventive example shown and described. By way of
example, therefore, the various retaining webs shown
can be combined in any desired manner with one another.
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Key
1 Joint strip
2 Strip
3 Web
4 Projecting part of web
5 Retaining web
6 Projecting part of retaining webs 5, 7, 10
7 Retaining web
8 Injection tube
9 Injection tube
10 Retaining web
11 Angle
12 Retaining web
