EP1061189B1 - Joint sealing for buildings - Google Patents

Abstract

The sealing strip (1) for construction and expansion joints between building elements has a cross section which comprises a middle section (4) and two oppositely oriented sections (2, 3) running in the longitudinal direction of the strip. At least one of the sections (2, 3) is provided with facilities (7, 9, 17) for injecting a sealing compound into the joint and its surrounding materials (in particular, concrete).

Description

The present invention relates to a joint tape according to the preamble of claim 1. In particular, it relates to such joint tapes for the sealing of construction joints, expansion joints and any joints of such joints.

The so-called construction joints, in particular in structures of poured concrete, are created by sectioning walls or floors, in which the sections are connected to butt joints or angle to each other, e.g. Walls on floors. Between building units, however, so-called expansion or dilation joints often have to be provided in order to compensate for movements of the units against each other, e.g. at temperature changes. All of these joints typically need to be sealed to prevent penetration or penetration of water, oil, dirt, etc., e.g. in or out of a building, room or container.

A known solution for the sealing of construction joints is to lay a so-called injection hose in the joint. After creating the juxtaposed units at the joint liquid sealant material is injected into the injection tube, the pressure used in the range, for example, in the range of 5 to 30 bar, but usually not higher than 100 bar in the short term. The sealing material exits through holes, which has the wall of the injection tube in the joint and hardened therein. The sealing material may be, for example, a polymeric material that cures in the joint and forms part of a water-impermeable solid.

The disadvantage of this method is, on the one hand, that the injection represents an additional operation. Finally, it is not possible to guarantee with absolute certainty that the sealing material fills the gap completely.

Another known possibility for sealing joints is the use of so-called joint tapes. Joint tapes are substantially strip-shaped and are usually made of plastic. The width is e.g. 20 cm, i. The joint tape extends into the two building elements each about 10 cm inside. Since steel reinforcements are only approx. 30 mm (minimum concrete cover to avoid corrosion) under the concrete surface, special precautions must be taken in the area of the joint tapes. As a rule, these consist of a special, complicated course of the reinforcement. The relatively large penetration depth of the joint tapes in the masonry is necessary to ensure the tightness; In particular concrete does not intensively bond with the material of the joint tapes, which is why a large contact surface equivalent to the large penetration depth alone can ensure the required tightness.

The outer joint tapes customary in the manufacture of floor panels are laid prior to the construction of the floor panels and the floor panels are cast successively with joints along the joint tape. Particular problems with this form are the risk of contamination before or during the pouring of the floor slabs. Before concreting the 2nd stage, an external joint tape must be cleaned of dirt, rubble and waste as well as residual concrete. All this work may possibly lead to a leakage in the construction joint.

For dilatation joints, the inner joint band is known, which is laid approximately centrally in the frontal or abdominal surfaces of the dilatation joints. Because of the large penetration depth, the problem arises here, especially in the case of end faces, that the reinforcement ending there has to be complicated in order to allow the joint tape to enter the structure. In particular, in horizontal laying the inner joint bands still carries the risk that by the application of the building material (concrete), the joint tape can be bent downwards and pushed away and covered by the joint tape and located under this volume of building material is not sufficiently filled. Both effects can lead to weakening and / or leakage in the joint.

For use in expansion joints, the seam tapes may centrally have a longitudinally extending tubular profile which receives by deformation the movement of the adjacent structural parts.

A sealing tape with integrated injection possibility is e.g. from WO-A-97/16603. It has a tubular, elastic body with two strip-shaped extensions. These foothills lie in the same plane and have on the surface of elevations and teeth on to increase the hold in the concrete after pouring. Each tail also has an injection channel on one broad side, on both tails on the same side. The leaking from these injection channels sealing material thus flows primarily along the side surface of the foothills and fills existing gaps between the sealing strip and concrete. Further injection may cause the sealing material to penetrate into the concrete above the side surface.

A joint tape according to the preamble of claim 1 is known from DE-A-34 27 110.

The disadvantage of this is firstly that the sealing strip has an inner and an outer side, i. depending on the requirements with the injection channels directed to one or the other wall side must be laid. A violation of this laying rule can lead to an insufficient sealing effect. Further, the seal acts by injection, especially against a flow around the sealing strip along the surface of the foothills.

An object of the present invention is to provide a joint tape with injection option, which provides an increased sealing effect by injection.

Such a joint tape is specified in claim 1. The further claims indicate preferred embodiments.

Accordingly, the joint strip is characterized by at least one strip-shaped extension which has an injection device at the end. The injection device makes it possible to inject injection means essentially starting from the end face in the surrounding concrete.

For the assessment of the advantages of the invention is to be noted that so-called "waterproof concrete" is present when the water transport under the given conditions is so small that the exiting on the inside water can evaporate or evaporate. Concrete is in any case a capillary system and therefore, depending on the design, has a greater or lesser capacity for water transport. Water transport therefore not only takes place in the construction joints of the concrete structure, but also distributed over the entire concrete, but the construction joints at any time zones greatly increased Represent water transportability, unless additional sealing measures are taken.

Taking into account the total water transport, therefore, the known joint sealing strips are only of limited effect, since in them the injection possibility for sealing material is designed so that the water transport is hindered in the joint and around the joint tape around. However, it is often the case that the concrete in the vicinity of a working joint is of a different structure than in the mass of the casting section, in particular has a higher water transportability. Another problematic situation occurs when the joint tape is laid horizontally and the concrete must flow under the horizontally oriented extensions.

According to the present invention, therefore, the injection device is arranged so that, although the joint between joint tape and surrounding concrete is sealed by the injection material, but in particular an injection takes place in the surrounding concrete and thus the capillary is interrupted in depth. One can also see this as a virtual widening of the joint tape into the concrete. Furthermore, the injection device is preferably arranged so that it acts in accordance with the symmetry of the joint tape, so that a distinction between inner and outer side is eliminated and thus a risk of failure due to incorrect installation is excluded.

Figur 1

zeigt einen Schnitt durch ein Arbeitsfugenband;

Figur 2

zeigt einen Schnitt durch ein Dilatationsfugenband;

Figur 3

zeigt eine Verwendung des Fugenbandes in einem Eckstoss;

Figur 4

zeigt eine Verwendung des Fugenbandes in einem geraden Stoss; und

Figur 5

zeigt die Verwendung des Dilatationsfugenbandes.

The invention will be further explained by embodiments with reference to figures.

FIG. 1

shows a section through a construction joint tape;

FIG. 2

shows a section through a Dilatationsfugenband;

FIG. 3

shows a use of the joint tape in a corner joint;

FIG. 4

shows a use of the joint tape in a straight joint; and

FIG. 5

shows the use of the dilatation joint tape.

The joint tape 1 (Figure 1) has two extensions 2, 3, which are connected to each other via a more or less pronounced central part 4. In the extensions 2, 3 is in each case an injection device 6. It consists essentially of a supply channel 7 for the injection material, depart from the outlets 9 to the end faces 10 of the extensions 2, 3.

The outlets 9 open into an outer channel 12, in which a cord 14 is inserted from a rubber-elastic material. The outer channel 12 has at its bottom a recess or groove 15 which is not filled by the sealing cord 14. This creates a possibility that the injection material can distribute uniformly over the entire length of the outer channels along the groove 15. Also, individual clogged outlets 9 are bridged.

Outwardly, the outer channels 12 have a slot 17 through which the injection material can escape over the entire length. The width of the slot 17 is dimensioned such that during the injection, the sealing cord 14 is not regularly pushed out of the outer channel 12, but the injection material pushes the sealing cord to the side and around her. The sealing cord 14 thus acts as a kind of check valve at the outlet of the injection device 6.

It is thus also possible to carry out a double or multiple injection: For this purpose, the injection material after injection, if it is a material hardening in the injection system, is removed by rinsing out of the injection device. For example, Can be injected with cement paste (mixture of cement and water) and rinsed with water. A non-rinsable material, such as e.g. a polymerizable material usually makes the injection device useless, so that injection with such a material must always be provided as the last injection step.

The supply of the injection material into the injection devices can take place from the ends of the joint tapes or through laterally attached supply lines. These measures are known per se and not shown.

FIG. 2 shows a joint tape 20 for use in dilatation joints. Instead of a solid central part, the dilatation joint strip 20 has a hollow profile 22 made of rubber-elastic material. The extensions attached thereto correspond to the above-described construction joint tape and are provided with the same reference numerals.

The extensions 2, 3 may have to improve the Halt in concrete, preferably on the sides, a profile as indicated in Figures 1 and 2 corrugation 24, which is designed in approximately sawtooth. In addition, the thickness of the extensions 2, 3 increases towards the outside, resulting in a kind of dovetail toothing with the concrete.

The material for the joint tape is preferably plastic, e.g. for the extensions 2, 3 and the middle part 4 to HD-PE, which is relatively stiff, and for the elastic center part 22 to LD-PE, which has rubber-elastic properties.

Figure 3 shows the application of the joint tape 1 in the working joint 30 between a bottom plate 31 and a wall 32 poured thereon. In the bottom plate 31 and the wall 32, the usual reinforcements 33 are embedded. When manufacturing the bottom plate 31, before the top layer 34 is poured, the dilatation joint strip is placed on the reinforcing bars 33 and optionally additionally fixed by means of known staples. The width of the joint tape 1 is chosen so that the middle part 4 is located approximately at the height of the surface 35 of the bottom plate 31. Also for this reason, the middle part 4 has on both sides in each case two longitudinally extending elevations 36, which can serve as a teaching for the correct embedding depth.

FIG. 3 also shows the effect of the joint tape 1. By injecting, a region 38 of the capillary system of the concrete is sealed above and below the joint tape around the end face. The water entering the wall 32 or bottom plate 31 according to arrows 40 from the relatively leaky joint zone 41 therefore has to flow around not only the joint tape 1 itself but also the sealed areas 38 above and below the joint tape 1. Particularly effective is this additional barrier effect in the region of the wall foot, where a part of the upper extension of the joint strip 1 is covered by material having a lower waterproofness: First, the surface of a bottom plate 31 is often covered by heavily diluted cement paste, the virtually no sealing effect unfolds, to On the other hand, the foot of a concrete wall is characterized in many cases by accumulations of individual, larger aggregate grains, which also reduces the tightness.

The extent of zone 38 is highly dependent on the surrounding material and injection conditions. The expansion shown is therefore not to be considered authoritative.

Due to the possibility of injecting into the depth of the concrete, the effect of the joint tape is expanded into the concrete and also in working joints with a relatively wide leakage zone, as illustrated in FIG. 3, the water flows (arrows 40) are forced into a narrower passage and a further path and thus ensures the desired tightness. By arranging the outlets for the injection material on the front side of the extensions 2, 3, it is also possible to carry out the injection under elevated pressure, as opposed to the injection material, an increased resistance to flow along the joint strip into the joint.

Due to the fact that an injection 38 is carried out in the structural concrete (instead of in a working joint), a wasteful escape of the injection resins from a leaky working joint is prevented.

It should also be mentioned that the relatively wide version of the joint tape 1 is self-standing, ie that it protrudes freely after pouring into eg a bottom plate 31 up out of the concrete and no further support measures during the casting of the wall 32 is required.

FIG. 4 shows an application of the joint tape 1 in the joint of two walls 44. The comments made above on FIG. 3 also apply to this application. It should also be noted that when placing the walls 44 according to Figure 4 on a bottom plate 31 according to Figure 3 at the intersection of the joint 30 between bottom plate 31 and wall 32, here walls 44, and the Arbeitsfuge 45 through the injection zone 38 above the joint strip 1 a Sealing of the shock between the two joint bands 1 takes place.

Preferably, the strips are still glued at the intersection, so as to achieve an additional seal at this particularly critical point.

Finally, FIG. 5 shows the use of the dilatation joint strip 20. It is embedded with its extensions 2, 3 into a concrete casting part 47 in each case. The joint between the concrete casting parts 47 is filled by insulating material 48 on both sides of the joint strip 20. Here, too, it becomes clear again how the additionally sealed regions 38 created by injection lead to increased resistance to the flow of water (arrows 40) around the joint tape 20.

From the foregoing description of the preferred embodiments, a variety of modifications will become apparent to those skilled in the art without departing from the scope of the invention as defined in the claims.

Among other things, it is conceivable to equip the joint tape with other superficial formations to improve the mechanical anchoring in the concrete; to carry out the injection devices differently, eg with a single, central supply channel for the injection material; the outlet area for the injection material (outer channel 12; Outlet slot 17) to be shaped differently or provided with a closure other than sealing cords 14, possibly also to dispense with a closure entirely, which, however, there is a risk that the outlet is clogged when embedded in the concrete; to produce the joint tape of other material, in particular other plastics. glossary HD-PE Polyethylene, high density LD-PE Polyethylene, low density

Claims (11)

1. Joint seal (1, 20) for sealing construction and dilatation joints in concrete constructions, the joint seal (1, 20) comprising two ledge-shaped prolongations (2, 3) extending in the longitudinal direction of the joint seal essentially which stand off from a central area (4, 22) in approximately opposite directions and comprise a means (6) for injecting a sealant, characterised in that the outlets (17) of the device are arranged on the end faces of the prolongations (2, 3) essentially in order to achieve an approximately symmetrical penetration of the sealant into the surrounding concrete with respect to the prolongations, and in that the thickness of the prolongations increases from the central portion in order to improve their retention in the concrete.
2. Joint seal (1, 20) according to claim 1, characterised in that the lateral surfaces of the prolongations (2, 3) are provided with a profile, preferably a serrated corrugation directed toward the central portion, in order to improve their retention in the concrete.
3. Joint seal according to one of claims 1 to 2, characterised in that the length of the prolongations (2, 3) is 30 mm at the most, thereby allowing the joint seal to be laid out across a concrete reinforcement.
4. Joint seal according to one of claims 1 to 3, characterised in that the joint seal (1, 20) as a whole is approximately ledge- or strip-shaped.
5. Joint seal (1, 20) according to one of claims 1 to 4, characterised in that it comprises exactly two prolongations (2, 3).
6. Joint seal (20) according to one of claims 1 to 5, characterised in that the prolongations (2, 3) are attached to a resilient dilatation element (22) such that a movement of structural components (47) that are connected by the joint seal can be absorbed by a deformation of the dilatation element.
7. Joint seal (20) according to claim 6, characterised in that the dilatation element (22) is essentially a hollow profile of a resilient, more particularly a rubber-elastic material.
8. Joint seal according to one of claims 1 to 7, characterised in that the prolongations (2, 3) consist of a relatively rigid material, preferably of high density polyethylene (HD-PE), and the dilatation element (22) consists of a rubber-elastic synthetic material, preferably of low density polyethylene (LD-PE).
9. Joint seal according to one of claims 1 to 8, characterised in that the injection device (6) comprises an outer channel (12) extending in the longitudinal direction of the prolongation (2, 3) and comprising an outlet slot (17) directed to the end face in order to allow the discharge of the injection material from the end face of the prolongation (2, 3).
10. Joint seal (1, 20) according to claim 9, characterised in that the outlet slot (17) has a smaller width than the greatest width of the outer channel (12), and an essentially rope-shaped, resilient and preferably rubber-elastic sealing element is inserted in the outer channel which fills out the outer channel (12) in order to prevent that liquids or other foreign bodies may penetrate into the injection means (6) through the outlet slot (17).
11. Use of a joint seal (1, 20) according to one of claims 1 to 10 for sealing construction and dilatation joints in concrete constructions, characterised in that a sealant is injected into the surrounding concrete from outlets (17) of the device that are essentially arranged on the end faces of the prolongations (2, 3) in order to virtually increase the dimensions of the prolongations and to interrupt the capillary system of the concrete in the injected area.

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