DE102018133399A1 - Process for sealing a building wall or ceiling - Google Patents

Abstract

A method for sealing at least one crack (2) or a construction joint in a building wall or ceiling (1) made of concrete and made of exposed concrete, with the following steps: applying a mineral filler layer (3) to the crack (2) or a construction joint Applying a first spray mortar layer (4) to the leveling compound layer (3) in an area that extends beyond the crack (2) in the longitudinal direction and in the direction transverse to its longitudinal direction on both sides by at least 200 mm with a structural thickness (14) of at least 9 mm, embedding a textile first carbon reinforcement (5) into a second spray mortar layer (6), which extends over the first spray mortar layer (4) in an area that is at least 200 mm thick on both sides by a length of the crack (2) in the longitudinal direction and in the direction transverse to its longitudinal direction ( 15) of at least 9 mm is applied, embedding a textile second carbon reinforcement (7) in a third spray mortar el layer (8), which is applied to the second spray mortar layer (6) in a region extending beyond the crack (2) in the longitudinal extension and in the direction transverse to its longitudinal extension on both sides in each case by at least 200 mm with a structural thickness (16) of at least 7 mm, application of one Cover layer (9) on the third spray mortar layer (8) with a structural thickness (17) of at least 6 mm, coating the cover layer (9) with a hydrophobic impregnation (10).

Description

The invention relates to a method for sealing at least one crack or construction joint in a building wall or ceiling made of concrete and designed as exposed concrete, in particular for deflecting cyclically occurring tensile and / or compressive forces from the building wall or which already cause cracks or movements in construction joints -Ceiling in an auxiliary and top layer, preferably while maintaining the exposed concrete look.

Such walls or ceilings designed as exposed concrete generally have a superficially simple, overall massive and impressive-looking appearance and can be found today on relatively large, modern buildings such as schools, museums, churches and also single-family houses. To provide the required statics and strength, such building walls or ceilings are usually produced as so-called reinforced concrete, comprising a cast concrete area and a steel reinforcement or reinforcement arranged therein. The concrete serves to absorb the compressive forces occurring in the wall or ceiling, the steel reinforcement to absorb the tensile forces. If the walls or ceilings mentioned form part of the outer shell of the building, water-impermeable concrete, so-called waterproof concrete, is generally used. The present invention relates in particular to this last-mentioned application.

It is known that cracks can form in the concrete of building walls or ceilings in the course of time and / or under special loads, especially when special structural circumstances are present. Cracks often occur, especially in the throat areas, in transitions between the wall and the ceiling, in complicated corner areas and on the flat ceiling or roof surface. Such cracks can be caused, for example, by tensile forces in the concrete, which are caused, for example, by thermal factors, the formation and / or growth of such a crack being accelerated by alternating and / or cyclically occurring tensile and compressive forces. In addition to the cracks that basically occur at every point in the concrete, the construction joints are also explicitly mentioned here, which can arise in particular between two adjacent concrete bodies made at different times, for example in a horizontal extension between a concrete floor slab and a concrete wall built thereon or in a vertical one Extension between two adjacent concrete walls. Such construction joints are also referred to below as cracks.

The cracks that form can - depending on the case of interest - be categorized into different groups or types, with the distinction between water-permeable and non-water-permeable cracks being particularly relevant in the present case. The latter, water-impermeable cracks are mostly insignificant due to their very small dimensions in relation to the wall or ceiling condition and generally do not require any repair measures. The water-impermeable cracks are therefore also referred to below as harmless cracks. The water-permeable cracks, on the other hand, can result in undesired water penetration through a wall or ceiling, for example into the interior of the building, and / or water ingress into the steel alarm level with a corresponding formation of corrosion and a consequent reduction in the steel. Such water-permeable cracks are therefore of great importance with regard to the wall or ceiling condition and require repair, in particular a seal, in order to maintain the wall or ceiling.

It has been shown that the measures known from the prior art for covering or sealing a crack formed in a concrete wall or ceiling, for example by means of a sealing compound such as an epoxy resin applied to and / or onto the crack, have the desired long-term effect. in particular, a seal over the normal lifetime of a building is not possible. Rather, such a crack generally continues to grow due to the tensile and compressive forces that still occur in the wall or ceiling, so that an ultimately water-permeable crack can form again in particular between the crack wall and the solidified sealing compound. A long-term security can therefore generally not be achieved with such a covering or sealing of the concrete wall or ceiling.

It is therefore an object of the present invention to provide a method for repairing a concrete wall or ceiling which has a crack, which improves at least one of the disadvantages mentioned above and in particular enables a crack which has formed in the concrete wall or ceiling to be permanently sealed.

The invention solves this problem by a method with the features of the main claim. Advantageous refinements and developments of the invention are disclosed in the subclaims, the description and the figures.

• In einem ersten Schritt erfolgt ein Aufbringen einer vorzugsweise elastifizierten, mineralischen Spachtelmasseschicht, insbesondere einer Dichtungsschlämme, auf den Riss, insbesondere in einem den Riss in Längserstreckung abdeckenden und in Richtung quer zu seiner Längserstreckung beidseitig jeweils um mindestens 75mm, vorzugsweise um 90mm, überragenden Bereich und einer Aufbaustärke von mindestens 2mm.

The method according to the invention for the repair of a building wall or ceiling made of concrete and designed as exposed concrete, in particular for deflecting from already a crack or damage to a construction joint in the building wall or ceiling, cyclical tensile and / or compressive forces in an auxiliary and top layer, preferably while maintaining the exposed concrete look, provides for the following steps:

• In a first step, a preferably elasticized, mineral filler layer, in particular a sealing slurry, is applied to the crack, in particular in a region covering the crack in the longitudinal direction and projecting on both sides by at least 75 mm, preferably 90 mm, on both sides in the direction transverse to its longitudinal direction a thickness of at least 2mm.

The leveling compound layer can be designed, for example, as the material StoCrete FS (trade name of StoCretec) and in the present case serves as a delamination or as an adhesion separating layer between the base of the concrete wall or ceiling and the spray mortar layer to be applied below, in particular in the area of the crack . It can thereby be achieved that there is no connection or adhesion between the concrete wall or ceiling and the first spray mortar layer in the area of the crack, so that tensile and / or compressive forces occurring in the concrete wall or ceiling in this area are not introduced into the first spray mortar layer and the crack cannot continue through the protective layer. Rather, these forces occurring in the concrete, in particular tensile forces, can be deflected by allowing the tensile forces to pull apart laterally and distributing the comparatively large individual crack over many smaller, innocuous cracks in the auxiliary and top layers. Thus, for example, with a deflection and distribution of the forces, a movement of a large single crack of approximately +/- 0.5 mm can be divided into the movement of ten smaller cracks of approximately +/- 0.05 mm each. Such last-mentioned small cracks are in particular not water-bearing and therefore unproblematic. The leveling compound layer thus serves not only to seal the crack, but in particular to weaken the shear bond between the concrete base and textile concrete layer in the area of the crack. The arrangement of the filler layer in a width of preferably 180 mm and a structural thickness of at least 2 mm enables a safe and sufficiently large area on both sides of the crack for the purpose of delamination.

In a next step, a first spray mortar layer is applied to the leveling compound layer and to an area adjacent to the leveling compound layer. The first spray mortar layer is applied, in particular, in an area projecting over the crack in the longitudinal direction and in the direction transverse to its longitudinal direction on both sides in each case by at least 200 mm, preferably by 600 mm, with a structural thickness of at least 9 mm.

The first spray mortar layer can be formed, for example, as the material StoCrete TS 100 (trade name of the company StoCretec) and serves as the first auxiliary support and cover layer that absorbs the tensile and compressive forces from the concrete wall or ceiling. In this way, in particular the tensile and compressive forces occurring in the building wall or ceiling to be repaired in the area of the crack can be diverted out of the building wall or ceiling into the auxiliary load-bearing and covering layer arranged above the crack. In the area adjacent to the leveling compound layer, the first spray mortar layer is non-positively connected to the building wall or ceiling.

In a next step, a textile first carbon reinforcement, also referred to as the first carbon reinforcement layer or first carbon reinforcement layer, is embedded in a second spray mortar layer, which is applied to the first spray mortar layer in a longitudinal extension and in a direction transverse to its longitudinal extension area with a thickness of at least 9 mm is applied on both sides by at least 200 mm, preferably by 600 mm. Embedding means, in particular, a complete encapsulation of the first carbon reinforcement by the spray mortar layer.

For example, a part of the second spray mortar layer can first be applied to the first spray mortar layer, the first carbon reinforcement placed on this part of the second spray mortar layer and then the remaining part of the second spray mortar layer applied to enclose and fill the spaces between the first carbon reinforcement. The first carbon reinforcement layer can in particular be designed as at least one reinforcement mat. To improve adhesion between the second spray mortar layer and the first carbon reinforcement layer, the first carbon reinforcement is preferably soaked and sanded with polymer before installation, so that it has a relatively rough surface. As a result, the tensile forces occurring in the auxiliary and top layers can be absorbed by the first carbon reinforcement. The first carbon reinforcement preferably has a mesh size of 10 mm to 30 mm, particularly preferably of 21 mm, and on its individual members preferably a cross-sectional area of 1 mm ² to 3 mm ² , particularly preferably of 1.81 mm ² . The second spray mortar layer can be used, for example, as the material StoCrete TS 100 (trade name of StoCretec) be formed and serves in particular as a second layer absorbing the movement forces from the concrete wall or ceiling. The second spray mortar layer is in particular non-positively connected to the first spray mortar layer.

In a next step, a textile second carbon reinforcement, also referred to as a second carbon reinforcement layer or second carbon reinforcement layer, is embedded in a third spray mortar layer, which is applied to the second spray mortar layer in one of the cracks in the longitudinal extent and in the direction transverse to its longitudinal extent on both sides in each case by at least 200 mm, preferably by 600 mm, protruding area and with a structural thickness of at least 7 mm, preferably at least 9 mm, particularly preferably 10 mm.

Here too, for example, a part of the third spray mortar layer can first be applied to the second spray mortar layer, the second carbon reinforcement placed on this part of the third spray mortar layer and then the remaining part of the third spray mortar layer applied to enclose and fill the spaces between the second carbon reinforcement. Like the first carbon reinforcement, the second carbon reinforcement is advantageously designed as at least one reinforcement mat. In the arrangement of the second carbon reinforcement layer, the transverse and longitudinal joints of the reinforcement mats that occur here are created with an offset of between 150 and 300 mm, preferably of approximately 200 mm, relative to the transverse and longitudinal joints occurring in the first carbon reinforcement layer that at least the simple reinforcement thickness is present throughout the component cross-section at every point of the cover layer. In the case of the transverse and longitudinal joints, at least two reinforcement mats of a reinforcement layer with one end face preferably lie directly against one another. In order to improve adhesion between the third spray mortar layer and the second carbon reinforcement, the second carbon reinforcement is preferably soaked and sanded with polymer, so that it has a relatively rough surface. As a result, in particular the tensile forces occurring in the auxiliary support and cover layer can be absorbed by means of the second carbon reinforcement layer. The second carbon reinforcement preferably has a mesh size of 10 mm to 30 mm, particularly preferably of 21 mm, and on its individual members preferably a cross-sectional area of 1 mm ² to 3 mm ² , particularly preferably of 1.81 mm ² . The third spray mortar layer can also be formed, for example, as the material StoCrete TS 100 (trade name of the company StoCretec) and serves as the third auxiliary support and cover layer that absorbs the tensile and compressive forces from the concrete wall or ceiling. The third spray mortar layer is connected to the second spray mortar layer in particular in a force-locking manner.

With these two textile-reinforced protective layers, in particular the single crack that has appeared in the reinforced concrete wall or reinforced concrete ceiling and that, for example, cyclically opens due to temperature stress, is to be converted into a finely divided and thus harmless crack pattern in the repair mortar. The respective carbon reinforcement can have a length of at least 1000 mm, preferably 5000 mm, in the longitudinal extent of the crack. The width of such a carbon reinforcement mat is preferably 1200 mm. Additional dimensions are usually unwieldy for use on a construction site.

In a next step, a top layer is applied to the third spray mortar layer with a thickness of at least 6 mm.

The top layer serves in particular to maintain the exposed concrete look and can be based, for example, on the material StoCrete TS 100 (trade name of StoCretec). Pigments can also be added to this material. Due to the relatively thin application of the cover layer, an overall structure of the auxiliary support and cover layer of preferably only 31 mm can be achieved. This is particularly advantageous on repair surfaces arranged at an angle to one another.

In a further step, the top layer is coated with a hydrophobic impregnation. In particular, the impregnation can be a water-repellent coating that easily penetrates the surface and protects it from the ingress of liquids. This enables a protective impermeability of the outer cover layer. The impregnation can be formed, for example, by the material StoCryl HC 100 (trade name of StoCretec).

With this arrangement, the forces occurring in the building wall or ceiling, in particular the tensile forces, can thus be diverted from the building wall or ceiling into the auxiliary and top layer. This occurs in particular in the area next to the leveling compound, in which the first spray mortar layer bears directly against the sub-surface of the building wall or ceiling and is non-positively connected to it. This area is also referred to as the discharge zone, in which the forces occurring in the crack area in the wall or ceiling of the building, in particular tensile forces, are deflected and in particular introduced into the auxiliary and top layers. The width of this area in relation to the crack is preferably around that Factors 1 to 1.3 greater than the height of the auxiliary and top layers. The construction height is particularly preferably at least 31 mm, preferably 35 mm, so that the length of the introduction zone is at least 31 mm, preferably approximately 45 mm. Overall, this can make it possible that the tensile and compressive forces occurring in the building wall or ceiling no longer result in the comparatively large individual crack that has arisen, but can be distributed over many smaller, harmless, in particular non-water-bearing cracks in the repair mortar.

Before the filler layer is applied, the surface of the building wall or ceiling is preferably treated with solid abrasive, in particular sandblasting, in particular until the surface concrete of the building wall or ceiling has an average surface tensile strength of at least 1.5 N / mm ² , preferably with a smallest single value of 1.0 N / mm ² . Surface tensile strength is to be understood in particular as the strength of the outer layer of the concrete wall or ceiling when a corresponding tensile force is applied. This can be detected in advance, for example, by means of a correspondingly arranged adhesive stamp on a tensile force measuring device.

The second carbon reinforcement is particularly preferably offset from the arrangement of the first carbon reinforcement. As a result, the tensile strength of the auxiliary support and cover layers can be increased in different directions. In particular in a corner or edge area, the orientation of the second carbon reinforcement is different from the orientation of the first carbon reinforcement, in particular at an angle in the longitudinal direction of the respective carbon reinforcement. Furthermore, the first and second carbon reinforcement layers are preferably arranged to overlap one another, preferably with an overlap area of at least 200 mm. This can prevent a transverse or longitudinal joint of two reinforcement meshes of one reinforcement layer with a transverse or longitudinal joint of two reinforcement meshes of another reinforcement layer being arranged one above the other. Only in a peripheral outer region of the layers can two end edges of the reinforcement mesh of the two reinforcement layers be arranged one above the other. Such a transverse or longitudinal joint of two reinforcement mats is preferably only offset laterally to the crack to be treated, but not on the crack, particularly preferably at a distance of at least 200 mm from the next crack. The mats are always arranged in a butt joint, not overlapping, within a carbon reinforcement layer. In a tapering corner or edge area of the building, for example a ridge or fillet area, it may be advantageous to arrange the carbon reinforcements in such a way that the abutting edges of the first carbon reinforcement arranged in a wall section adjacent to the corner area essentially run parallel to the corner, and the second carbon reinforcement is pre-folded according to the angle of the corner and the area around the corner is applied to the corner. The next joint of the second carbon reinforcement is preferably arranged at a distance of at least 250 mm from the corner. Different molded parts are particularly preferably provided for such a corner region, for example at an angle of 60 °, 90 ° and 120 °. The total length of such a molded part is preferably at least 400 mm.

Before the filler layer is applied, all cracks that are visible in an area of the building wall or ceiling and that are visually visible from the outside are preferably detected, in particular after the surface treatment with blasting agent. As a result, a precise actual state of the building wall or ceiling can advantageously be determined and the cracks found can be categorized in particular for the further measures.

For this purpose, after the cracks have been recorded, a crack mapping can be carried out with details of at least the crack type, the crack width and the crack course. For example, the cracks can be divided into bending and separating cracks and a corresponding selection of the areas to be treated or repaired can be determined. Such a crack mapping serves, among other things, to avoid falling below the abovementioned distance of a joint between two reinforcements to a crack of preferably 200 mm. This also enables precise planning of the layers to be applied.

For this purpose, after the cracks have been detected, the expected crack movements can be calculated and the area of the building wall or ceiling to be repaired can be determined accordingly. In particular - depending on the temperature influence - there may be different strong, expected crack movements on a wall or ceiling, whereby for each individual crack and the expected crack movement, an individual repair measure can be used for this.

To visually enhance the visible part of the surface repaired by means of the method, the material of the cover layer can be provided with pigments before the cover layer is applied. For example, in order to enhance the optical effect, the cover layer can additionally be coated with color pigments, in particular white and / or gray pigments. In this way, for example, a repaired area can be optically adapted to an area arranged adjacent to it, in particular to discolorations that have arisen over time.

In addition, a fair-faced concrete board structure can be rubbed into the cover layer by means of a trowel and preferably adjusted to adjacently arranged areas.

Preferably, for example in a manufacturing process, prior to arranging the first carbon reinforcement and / or the second carbon reinforcement, individual fibers are sewn into bundles to form the mesh-like textile forming the carbon reinforcement. Of course, this manufacturing process does not necessarily have to take place immediately before arranging the carbon reinforcement, but rather can be done by the manufacturer.

In addition, prior to arranging the first carbon reinforcement and / or the second carbon reinforcement, a hot-curing epoxy resin is preferably applied, for example by means of an impregnation, to the first carbon reinforcement and / or the second carbon reinforcement.

Furthermore, after or during the application of a heat-curing epoxy resin, the first carbon reinforcement and / or the second carbon reinforcement is preferably sprinkled with sand. As a result, the carbon reinforcement can have a particularly rough surface, which is particularly advantageous for connection and adhesion to the spray mortar. The sand material can be, for example, StoQuarz (trade name of StoCretec). The sand particularly advantageously has a grain size of 0.3 to 0.8 mm.

If there are several cracks next to each other in the building wall or ceiling, the first carbon reinforcement and / or second carbon reinforcement is arranged in such a way that the next butt edge is at least 200mm away from the next crack. If there is a crack in the area of two building walls or ceilings arranged at an angle to each other, especially in a ridge or groove area, the first carbon reinforcement and / or second carbon reinforcement is laid in this area over the entire surface, i.e. without a butt edge , preferably such that a butt edge is arranged at least 250 mm from the tip of the corner or edge. In addition, the corner or edge area is preferably removed in preparation in such a way that the filler can be applied to a flat plateau oriented perpendicular to the course of the crack.

• 1 - eine Schnittansicht einer Betondecke mit einem Riss;
• 2 - die Betondecke mit einer gemäß dem erfindungsgemäßen Verfahren darauf aufgebrachten Spachtelmasseschicht;
• 3 - die Betondecke mit mehreren gemäß dem erfindungsgemäßen Verfahren darauf aufgebrachten Schichten;
• 4 - die Betondecke mit einer gemäß dem erfindungsgemäßen Verfahren auf eine Deckschicht aufgebrachten Imprägnierung;
• 5 - ein Gesamtquerschnitt der gemäß dem erfindungsgemäßen Verfahren hergestellten Hilfstrag- und Deckschicht; und
• 6 - ein Gesamtquerschnitt der gemäß dem erfindungsgemäßen Verfahren hergestellten Hilfstrag- und Deckschicht an einer Gebäudeecke.

An exemplary embodiment of the method according to the invention is explained in more detail below with reference to the figures. The same reference numerals designate the same components. It shows purely schematically:

• 1 - A sectional view of a concrete ceiling with a crack;
• 2nd - The concrete ceiling with a filler layer applied thereon according to the method according to the invention;
• 3rd - The concrete ceiling with several layers applied thereon according to the method according to the invention;
• 4th - The concrete ceiling with an impregnation applied to a cover layer according to the method according to the invention;
• 5 an overall cross section of the auxiliary support and cover layer produced according to the method according to the invention; and
• 6 - An overall cross section of the auxiliary base and top layer produced according to the inventive method at a building corner.

In the 1 is an example of a concrete ceiling 1 with a crack formed in it 2nd shown. The concrete ceiling 1 can be, for example, a building roof made of exposed concrete. The crack shown here 2nd is in particular a water-permeable crack 2nd which with the below the concrete ceiling 1 arranged drops should be shown. Such a crack 2nd lets liquids through the wall or ceiling 1 pass through, for example rainwater from the outside of the building into the building interior or liquids, such as storage or silo water, from the inside of the building to the outside of the building.

Such a crack 2nd can in particular as a result of in the concrete ceiling 1 alternating and / or cyclically occurring tensile and compressive forces, for example due to thermal influences. In the 1 for example by the arrows P1 and P2 featured; here lie in the concrete ceiling 1 due to thermal expansion tensile and compressive forces in the area of the crack 2nd on. This causes such a crack to grow 2nd usually increases over time, in particular the cross section of the crack increases 2nd .

The crack 2nd can in the present case in particular after treatment of the surface 10 the concrete ceiling 1 have become visible from the outside. Such a surface treatment can, for example, be a sandblasting of the outer layer of the concrete ceiling, as a result of which parts adhering loosely to the outside of the concrete ceiling are usually blasted over time and thus the core substance of the concrete ceiling can be exposed. Such a sandblasting can roughen the surface of the concrete ceiling in such a way that it has an average surface tensile strength of at least 1.5 N / mm ² . Surface tensile strength is to be understood in particular as the strength of the outer layer of the concrete ceiling when a tensile force is applied.

The cracks in the concrete ceiling made visible by sandblasting from the outside 1 can then be recorded, categorized and, in particular, included in a crack mapping according to size or type of crack. This allows the entire concrete floor 1 with regard to the cracks formed therein and analyzed for the repair measures. In particular, it can calculate the expected crack movements and determine the area of the building ceiling to be repaired accordingly 1 respectively.

Based on this situation, the concrete ceiling is repaired 1 in the area of the crack 2nd , as in 2nd shown, according to the invention first of all applying a mineral filler layer 3rd . This putty layer 3rd can be, for example, a sealing slurry that is in the crack 2nd distributed and can therefore close it. The filler layer is particularly preferred 3rd formed by the material StoCrete FS (trade name of StoCretec). The application of the leveling compound 3rd is advantageously done manually, for example by means of an aid such as a trowel.

The filler layer 3rd covers the crack 2nd completely along its longitudinal extent, not as in 2nd Only shown partially for the sake of clarity. In width 11 the arrangement, that is essentially perpendicular to the longitudinal extension of the crack 2nd , the filler layer extends 3rd over at least 150mm, particularly preferably over about 180mm, the course of the crack 2nd always essentially in the middle of the width 11 the filler layer 3rd is arranged. The body height or body thickness 12th the filler layer 3rd is advantageously at least 2 mm.

As in 3rd is shown, in a next step of the method according to the invention on the filler layer 3rd as well as a first spray mortar layer in an adjacent area 4th applied. The first spray mortar layer 4th encloses the filler layer 3rd on at least three of its sides, preferably on five of its sides, namely on the crack 2nd facing away surface and on the side surfaces of the leveling compound layer 3rd , completely, which in 3rd is only partially shown for a better overview.

The first spray mortar layer 4th also extends over the entire length of the crack 2nd as well as in the direction transverse to its longitudinal extent on both sides by at least 200 mm, preferably by 600 mm, so that the first spray mortar layer 4th a width 13 of at least 400 mm, preferably of about 1200 mm. The structural strength 14 from the surface of the concrete ceiling 1 is preferably at least 9mm, so that the filler layer 3rd - depending on their thickness - from the first spray mortar layer 4th is covered by at least 6mm. As material for the first spray mortar layer 4th For example, StoCrete TS 100 (trade name of StoCretec) is intended.

Preferably on the first spray mortar layer that has not yet dried 4th is then a textile first carbon reinforcement 5 applied and by applying a second layer of spray mortar 6 embedded.

The first carbon reinforcement 5 is in particular one of individual fibers in bundles to the carbon reinforcement 5 Sewn mesh-like textile, which is preferably soaked in heat-curing epoxy resin in a manufacturing process and then sprinkled with sand. The sand advantageously has a grain size of 0.3 to 0.8 mm. This can be a first carbon reinforcement 5 be created, which has a very rough surface for a particularly advantageous connection to the respective spray mortar layer. The first carbon reinforcement 5 can have a cross-sectional area of approximately 1.8 mm ² and preferably a mesh size of 21 mm on their links, that is to say on their fibers sewn into bundles.

Embedding the on the first spray mortar layer 4th first carbon reinforcement 5 is then carried out by preferably manually applying the second spray mortar layer 6 . The material of the second layer of spray mortar 6 , in particular StoCrete TS 100 (trade name of StoCretec), flows in its initially viscous state into the spaces between the mesh-like first carbon reinforcement 5 and completely encloses them.

The second spray mortar layer 6 extends in the manufactured state also over the entire length of the crack 2nd and in the direction transverse to its longitudinal extent on both sides by at least 200 mm, preferably by 600 mm, so that the second spray mortar layer 6 , also like the first layer of spray mortar 4th , a width 13 of at least 400 mm, preferably of about 1200 mm, the first spray mortar layer 4th from the second layer of spray mortar 6 Completely is covered. The structural strength 15 the second layer of spray mortar 6 from the first spray mortar layer 4th is also preferably at least 9 mm.

Preferably on the second spray mortar layer that has not yet dried 6 then becomes a textile second carbon reinforcement 7 applied and by applying a third layer of spray mortar 8th embedded. The second carbon reinforcement 7 is compared to the arrangement of the first carbon reinforcement 5 staggered.

The second carbon reinforcement 7 is identical in construction to the first carbon reinforcement 5 manufactured. In particular, the second carbon reinforcement includes 7 a stitch-like textile sewn from individual fibers in bundles to form the carbon reinforcement, which has a mesh size of preferably approximately 21 mm and a cross-sectional area of preferably approximately 1.8 mm ² on the individual links, the textile being polymer-impregnated and sanded.

Embedding the second carbon reinforcement 7 is again carried out by manually applying the third layer of spray mortar 8th . The material of the third layer of spray mortar 8th , in particular StoCrete TS 100 (trade name of StoCretec), encloses the mesh-like spaces between the second carbon reinforcement in this manufacturing step 7 Completely.

The third layer of spray mortar 8th extends in the manufactured state also over the entire length of the crack 2nd and in the direction transverse to its longitudinal extent on both sides by at least 200 mm, preferably by 600 mm. Consequently, the third layer of spray mortar 8th , as well as the first and second spray mortar layers, a width 13 of at least 400 mm, preferably of about 1200 mm, the third spray mortar layer 8th completely covering the first and second spray mortar layers. The thickness of the third spray mortar layer 8th from the second layer of spray mortar 6 is also preferably at least 7 mm.

The spray mortar layers, in particular non-positively connected 4th , 6 , 8th thus form a construction height on the base of the building ceiling 1 of about 25mm. As in the 4th and 5 is shown on the third spray mortar layer 8th a top layer 9 applied with a thickness of at least 6mm. The overall structure of the auxiliary and top layers 20 can consequently have a height of 31 mm, preferably 35 mm.

The top layer 9 is formed, for example, from the material StoCrete TS 100-V1 (trade name of StoCretec) and a mixed pigment therein, which is not shown here. The pigments can in particular be color pigments, as a result of which the top layer 9 can have a predefined color. In the present case, the top layer serves 9 especially to maintain the exposed concrete look and is accordingly preferably provided with white and / or gray color pigments.

On this top layer 9 is used to protect against the penetration of liquids into the surface of the auxiliary and top layers 20 applied a coating designed as a hydrophobic impregnation, which in 5 is shown with the dotted line. This makes the outer cover layer water-proof 9 enables. The impregnation can be formed, for example, from the StoCryl HC 100 material (trade name of StoCretec).

In the 6 is the result of using the method according to the invention on a corner of a building 21st , especially shown on a tapered concrete roof construction. In the example shown as a ridge edge or area, the filler layer serving as a separation of adhesion is 3rd on a crack to be repaired to the course of the repair 2nd vertically arranged plateau applied, in the present case in an essentially horizontal extension. The first and second carbon reinforcements 5 , 7 are arranged in the corner area such that they are pre-edged according to the angle of the corner or the ridge area and the area around the corner area is applied to the corner. At least the first spray mortar layer can have a thickness that is significantly greater than that of the adjacent flat wall or ceiling area, at least in the corner or edge area of the building, in particular in order to produce the optical contour of the building corner or edge. A correspondingly corresponding configuration is advantageously provided for a corner region (not shown) designed as a throat.

The end or butt edges 18th the first carbon reinforcements 5 are arranged farther away from the kink point of the corner than the end or butt edges in such corner arrangements 19th the second carbon reinforcement 7 so that between the first and second carbon reinforcements 5 , 7 an overlap region, not specified, is formed in the respective end region. This can result in larger secondary cracks in the auxiliary and top layers 20 be avoided. The butt edge of the second carbon reinforcement 7 is preferably arranged at a distance of at least 250 mm from the corner.

It should be clear that the scope of the present invention is not limited to the exemplary embodiments described. In particular, the proportions or dimensions of the auxiliary support and cover layers can be modified, depending on the design of the crack, without changing the essence of the invention.

Reference list

1

Building wall or ceiling

2nd

Crack

3rd

Filler layer

4th

first layer of spray mortar

5

first carbon reinforcement

6

second layer of spray mortar

7

second carbon reinforcement

8th

third spray mortar layer

9

Top layer

10th

Coating

11

width

12th

Construction height

13

width

14

Construction height

15

Construction height

16

Construction height

17th

Construction height

18th

Shock

19th

Shock

20

Auxiliary and top layer

21

Corner area

P1

Tensile or compressive force

P2

Tensile or compressive force

Claims (11)

Method for sealing at least one crack (2) or a construction joint in a building wall or ceiling (1) made of concrete and designed as exposed concrete, in particular for the deflection of cracks (2) causing cyclical tensile and / or compressive forces (P1, P2 ) from the building wall or ceiling (1) into an auxiliary support and cover layer (20), preferably while maintaining the exposed concrete look, with the following steps: - Applying a mineral filler layer (3), in particular a sealing slurry, to the crack (2), in particular in an area covering the crack (2) in the longitudinal direction and projecting on both sides in the direction transverse to its longitudinal direction by a thickness of at least 75 mm ) of at least 2mm, - Application of a first spray mortar layer (4) on and next to the leveling compound layer (3) in an area overhanging the crack (2) in the longitudinal direction and in the direction transverse to its longitudinal direction on both sides by at least 200 mm with a structural thickness (14) of at least 9 mm, - Embedding a textile first carbon reinforcement (5) in a second spray mortar layer (6), which extends over the first spray mortar layer (4) in an area extending beyond the crack (2) in the longitudinal direction and in the direction transverse to its longitudinal direction on both sides by at least 200 mm is applied with a structural thickness (15) of at least 9 mm, - Embedding a textile second carbon reinforcement (7) in a third spray mortar layer (8), which extends over the second spray mortar layer (6) in an area extending beyond the crack (2) in the longitudinal extent and in the direction transverse to its longitudinal extent by at least 200 mm on both sides is applied with a structural thickness (16) of at least 7 mm, - applying a cover layer (9) to the third spray mortar layer (8) with a structural thickness (17) of at least 6 mm, - Coating the top layer (9) with a hydrophobic impregnation (10). Procedure according to Claim 1 , characterized in that prior to the application of the filler layer (3), the first spray mortar layer (4), the second spray mortar layer (6), the third spray mortar layer (8) and / or the top layer (9) each treating the substrate for the layer (3, 4, 6, 8, 9) forming surface (1, 3, 4, 5, 6, 8) with a solid blasting agent, in particular sandblasting, in particular until the surface has an average tensile strength of at least 1.5 N mm ² . Procedure according to one of the Claims 1 or 2nd , characterized in that the second carbon reinforcement (7) is offset from the arrangement of the first carbon reinforcement (5). Method according to one of the preceding claims, characterized in that, prior to the application of the filler layer (3), all cracks which are present in an area of the building wall or ceiling (1) and are visually visible from the outside are detected. Procedure according to Claim 4 , characterized in that after the cracks have been recorded, a crack mapping is carried out with details of at least the crack type, the crack width and the crack course. Procedure according to one of the Claims 4 or 5 , characterized in that after detecting the cracks, the expected crack movements are calculated and the area of the building wall or ceiling (1) to be repaired is determined accordingly. Method according to one of the preceding claims, characterized in that prior to the application of the cover layer (9) it is provided with pigments, in particular with color pigments. Method according to one of the preceding claims, characterized in that an exposed concrete board structure is rubbed into the cover layer (9), in particular by means of a trowel. Method according to one of the preceding claims, characterized in that before arranging the first carbon reinforcement (5) and / or the second carbon reinforcement (7), sewing individual fibers in bundles to each of the carbon reinforcement (5, 7 ) forming mesh-like textile. Method according to one of the preceding claims, characterized in that prior to arranging the first carbon reinforcement (5) and / or the second carbon reinforcement (7), an application of a thermosetting epoxy resin by means of impregnation on the first carbon reinforcement (5) and / or the second carbon reinforcement (7). Procedure according to Claim 10 , characterized in that after or during the application of a heat-curing epoxy resin, the first carbon reinforcement (5) and / or the second carbon reinforcement (7) is sprinkled with sand.

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