DE102019217313A1 - Reinforcement device for an existing building, reinforcement arrangement with an existing building and such a reinforcing device attached to it, as well as a method for reinforcing such an existing building - Google Patents

Abstract

A reinforcement device for an existing building (2) comprises a reinforcing layer (7) that can be attached to an outer surface (6) of the existing building (2) and at least one anchoring element (8) with which the reinforcing layer (7) can be anchored to the existing building (2).

Description

The invention relates to a reinforcement device for an existing building, a reinforcement arrangement with an existing building and such a reinforcing device attached to it, and a method for reinforcing such an existing building.

Existing structures that are subject to mechanical stress, such as bridge girders, are subject to wear and tear. Wear and tear reduces the load-bearing capacity of the existing structure. If the actual load-bearing capacity of the existing structure falls below a critical target value, the existing structure is no longer approved, in particular for use in road traffic.

The invention is based on the object of improving the load-bearing capacity of an existing structure and, in particular, of increasing the actual load-bearing capacity of the existing structure.

The object is achieved by the features of claims 1, 12 and 15. The essence of the invention is that a reinforcement device can be attached to an existing building. An existing building has in particular concrete, in particular steel-reinforced concrete. The reinforcement device has a reinforcement layer which can be attached to an outer surface of the existing building. The reinforcement layer can in particular be connected to the existing structure over a large area and in particular over a large area. The reinforcement layer can be applied to an outer surface of the existing building that is essentially of any shape. The reinforcement layer enables a large-area bond with the existing structure. At the side wall transitions and / or the edge areas of the existing structure, the overall flexible reinforcement layer can be adapted to the outer surface of the existing structure. The reinforcement device comprises at least one anchoring element with which the reinforcement layer can be anchored to the existing structure.

In particular, the reinforcement device comprises a plurality of anchoring elements in order to anchor the reinforcement layer at a plurality of anchoring points on the existing structure. The anchoring element is in particular a concrete screw with a self-tapping external thread or an adhesive anchor which can be anchored in a borehole by means of a hardenable adhesive. The curable adhesive can also be used in combination with the self-tapping external thread for the concrete screw. The anchoring element can also be an undercut dowel or an expansion dowel.

According to the invention, it has been found that the reinforcement device is particularly suitable for absorbing deflection forces and / or anchoring forces that occur when the existing structure has an uneven outer surface, as is the case with a T-shaped girder. The anchoring elements absorb these deflection forces and / or anchoring forces and anchor them in the existing structure. Through the anchoring elements, the deflecting forces and / or anchoring forces are introduced, in particular, into the component interior of the existing structure. This avoids high surface loads on the existing structure. According to the invention, it has been found that the actual load-bearing capacity of the existing structure can be increased by at least 20%, in particular at least 25%, and in particular by up to 30%, by the reinforcement device. The existing structure can still be used by attaching the reinforcement device. An extensive restoration and / or a new building are unnecessary. The use of the reinforcement device according to the invention is cost-efficient and saves resources. The reinforcement device enables sustainable use of the existing structure and makes ecological sense.

A support element according to claim 2 enables the reinforcement layer to be reliably supported in an uneven transition area of the outer surface of the existing structure. The transition area is particularly concave. In particular, the existing structure is a T-beam. In particular, the outer surface comprises two side surfaces arranged transversely and in particular perpendicular to one another, the at least one support element being attachable to the transition, in particular to the joint of the side surfaces. In particular, several support elements are provided along the edge between the side surfaces of the existing building.

A support element according to claim 3 ensures a defined contact with the reinforcement layer and thus a defined support of the reinforcement layer on the existing structure. In particular, a first contact surface and a second contact surface of the support element are oriented transversely, in particular not parallel, to one another and in particular essentially perpendicular, that is to say with a 90 ° angular orientation of their surface normals to one another.

A reinforcement device according to claim 4 enables defined, in particular increased, adhesion conditions between the support element and the reinforcement layer. In particular, the contact surfaces have a defined surface roughness. It is advantageous if the contact surfaces have a coefficient of friction, which is also the coefficient of friction or Is called the coefficient of friction, which is greater than 0.4, in particular greater than 0.45, in particular greater than 0.48 and in particular greater than 0.5.

Additionally or alternatively, the contact surfaces can have a surface structure at least in some areas or completely, in particular in the form of, in particular raised, ribbing and / or rastering. It is advantageous if a distance between adjacent ribs and / or grid lines is between 5 mm and 15 mm, in particular between 8 mm and 12 mm, in particular between 9 mm and 11 mm and in particular 10 mm. The ribbing and / or grid forms a regional elevation on the contact surfaces in a range from 1 mm to 3 mm, in particular from 1.5 mm to 2.5 mm and in particular from 2 mm. In particular, it is also conceivable that the ribbing and / or grid is designed as negative, that is to say as a recess on the contact surface, in particular in the form of grooves or channels.

A reinforcement device according to claim 5 enables the support element to better rest against an uneven outer surface of the existing structure. In particular, the contact surfaces are curved with respect to an axis which is oriented parallel to a profile axis of the support element. In particular, the support element is designed in the manner of a profile, the support element having an essentially constant, that is to say unchangeable, surface cross-section along the longitudinal axis of the profile.

A reinforcement device according to claim 6 is designed to be particularly robust. The reinforcement device is durable. In particular, the support element can have ultra-high-strength concrete (UHFB) or, according to the English-language abbreviation UHPC. UHPC has a particularly high level of impermeability and strength. In particular, the compressive strength is at least 150 N / mm ² . The water-cement ratio, or w / c ratio for short, is in particular less than 0.25. In particular, the characteristic strength f _ck of UHPC is at least 80 N / mm ² , in particular at least 90 N / mm ² and in particular at least 100 N / mm ² .

A reinforcement device according to claim 7 enables the anchoring element to be passed directly through the support element. The support element can advantageously be used to support the reinforcement layer by means of the anchoring element. In particular, the main through-hole is arranged in an area between the first contact surface and the second contact surface. In particular, the main through-hole is arranged at an angle of inclination with respect to the first contact surface, the angle of inclination being between 90 ° and 135 °, in particular between 90 ° and 120 ° and in particular between 95 ° and 110 °.

A reinforcement device according to claim 8 facilitates the attachment of the support element to the existing structure. A mounting screw, in particular, serves as the fixing element and can be shortened, in particular by a secondary through-hole in the support element. In particular, two secondary through-bores are provided on the support element, through each of which a fixing element, that is to say a mounting screw, can be used to fasten the support element to the existing structure.

A reinforcement arrangement according to claim 9 enables diverse and flexible configurations of the support element. The support element can, in particular, be attached to an unevenly shaped outer surface of the existing building so as to support it over a large area. A cross-sectional shape of the support element is designed in particular to be essentially rectangular with broken edges, that is to say with rounded edges. The support element can also have a triangular or wedge-shaped cross-sectional shape, in particular in the form of a right-angled triangle with broken, that is to say rounded, edges.

A reinforcement device according to claim 10 ensures a reliable and flexible deflection of the forces acting on the existing structure, which are reliably absorbed and deflected by the reinforcement layer. The reinforcement layer comprises a binder layer on which a flexible reinforcement layer is arranged. In particular, the flexible reinforcement layer is arranged on the binder layer. The flexible reinforcement layer is in particular arranged completely in a binder layer or between two binder layers and in particular embedded therein. The flexible reinforcement layer is reliably protected by the binder layer.

The flexible reinforcement layer includes, in particular, textile reinforcement and, in particular, includes reinforcing fibers, in particular glass fibers and / or carbon fibers. The fibers can be arranged in a disordered manner as scrims and / or as woven fabrics, in particular in the form of a mat. The binder layer comprises in particular epoxy resin and / or a mineral binder, in particular a mortar, in particular fine-grain concrete and / or high-performance concrete (UHPC and / or HPC), in particular with fine aggregates, cement and / or additives such as blast furnace slag and / or additives.

The binder layer can in particular have a plurality of individual layers, in particular a first binder layer and a second binder layer, the flexible reinforcement layer is arranged completely embedded between the two binder layers. It is also conceivable that the reinforcement layer is arranged at least partially exposed on a surface of the binder layer.

A reinforcement device according to claim 11 ensures a safe and reliable anchoring of the anchoring element in the existing structure. In addition, it is ensured that the support element is held securely and reliably by the anchoring element. A holding section of the anchoring element can be formed, for example, by a screw head. Additionally or alternatively, the anchoring element in the holding section can have an, in particular metric, external thread onto which a holding nut can be screwed.

A reinforcement arrangement according to claim 12 essentially has the advantages of the reinforcement device, to which reference is hereby made.

A reinforcement arrangement according to claim 13 enables a reliable attachment of the reinforcement device along a longitudinal extension of the existing structure. In particular, a large-area deflection of the forces occurring on the existing structure is guaranteed.

A reinforcement arrangement according to claim 14 enables the forces to be deflected on existing structures with different surface sections which are oriented transversely to one another. Such an existing structure is, for example, a T-girder-shaped bridgehead. An angle of inclination between the surface sections of the existing structure is in particular between 50 ° and 110 °, in particular between 80 ° and 100 ° and in particular between 85 ° and 95 ° and in particular precisely 90 °.

A method according to claim 15 enables an immediate increase in the actual load-bearing capacity of an existing structure.

Both the features specified in the patent claims and the features specified in the following exemplary embodiments of the device according to the invention are each suitable alone or in combination with one another to further develop the subject matter according to the invention. The respective combinations of features do not represent any restriction with regard to the further developments of the subject matter of the invention, but are essentially merely exemplary in nature.

• 1 eine Seitenansicht eines Bestandsbauwerkes mit einer daran angebrachten erfindungsgemäßen Verstärkungsvorrichtung,
• 2 eine Schnittansicht gemäß Schnittlinie II-II in 1,
• 3 eine 2 entsprechende Darstellung des Bestandbauwerks zur Anbringung der Verstärkungsvorrichtung,
• 4 eine 3 entsprechende Darstellung mit einem verankerten Verankerungselement,
• 5 eine 4 entsprechende Darstellung mit einer aufgebrachten Verstärkungslage,
• 6 eine schematische Darstellung zur geneigten Anordnung einer textilen Bewehrung,
• 7 eine 1 entsprechende Darstellung einer Verstärkungsvorrichtung gemäß einem zweiten Ausführungsbeispiel,
• 8 eine 6 entsprechende Darstellung einer textilen Bewehrung in einer abgewandelten Auffächerung,
• 9 eine Detaildarstellung einer Auffächerung von Garnen für eine textile Bewehrung,
• 10 eine 9 entsprechende Darstellung einer alternativen Auffächerung der Garnen,
• 11 eine 5 entsprechende Darstellung einer Verstärkungsanordnung gemäß einem dritten Ausführungsbeispiel mit einem Stützelement,
• 12 eine vergrößerte Schnittdarstellung des Stützelements in 11,
• 13 eine Ansicht des Stützelements gemäß Pfeil XIII in 12,
• 14 eine 11 entsprechende Darstellung zur Anbringung der in 11 dargestellten Verstärkungsvorrichtung,
• 15 eine 14 entsprechende Darstellung mit verankertem Stützelement,
• 16 eine Seitenansicht der Verstärkungsanordnung gemäß 15,
• 17 eine Seitenansicht eines Bestandsbauwerkes mit einer Verstärkungsanordnung gemäß einem vierten Ausführungsbeispiel,
• 18 eine vergrößerte Detailansicht einer Schnittdarstellung gemäß Schnittlinie XVIII-XVIII in 17,
• 19 eine vergrößerte Schnittansicht des Stützelements gemäß 18,
• 20 eine Ansicht des Stützelements in 19 gemäß Pfeil XX,
• 21 eine Seitenansicht des Verankerungselements gemäß 18,
• 22 eine weitere Querschnittsdarstellung eines Bestandsbauwerks mit einer Verstärkungsvorrichtung,
• 23 eine vergrößerte Detaildarstellung des Details XXIII in 22,
• 24 eine 11 entsprechende Darstellung einer Verstärkungsvorrichtung gemäß einem fünften Ausführungsbeispiel,
• 25 eine 11 entsprechende Darstellung einer Verstärkungsanordnung gemäß einem sechsten Ausführungsbeispiel,
• 26 eine 13 entsprechende Darstellung des Stützelements gemäß 25,
• 27 eine 11 entsprechende Darstellung eines Bestandsbauwerks mit einer Verstärkungsvorrichtung gemäß einem siebten Ausführungsbeispiels,
• 28 eine Schnittdarstellung gemäß Schnittlinie XXVIII-XXVIII in 27,
• 29 eine 26 entsprechende Darstellung des Stützelements gemäß 27,
• 30 eine 11 entsprechende Darstellung einer Verstärkungsvorrichtung gemäß einem achten Ausführungsbeispiel,
• 31 eine 11 entsprechende Darstellung einer Verstärkungsvorrichtung gemäß einem neunten Ausführungsbeispiel,
• 32 eine 1 entsprechende Darstellung zur Herstellung der Verstärkungsvorrichtung gemäß 31,
• 33 eine 12 entsprechende Darstellung des Stützelements in 31,
• 34 eine vergrößerte Schnittdarstellung eines Umlenkelements der Verstärkungsvorrichtung gemäß 31,
• 35 eine 3 entsprechende Darstellung eines Bestandbauwerks zur Anbringung der Verstärkungsvorrichtung gemäß 31,
• 36 eine 31 entsprechende Darstellung zur Herstellung der Verstärkungsvorrichtung gemäß 31,
• 37 eine 11 entsprechende Darstellung einer Verstärkungsvorrichtung gemäß einem zehnten Ausführungsbeispiels.

Further features, advantages and details of the invention emerge from the following description of exemplary embodiments with reference to the drawing. Show it:

• 1 a side view of an existing building with a reinforcement device according to the invention attached thereto,
• 2 a sectional view according to section line II-II in 1 ,
• 3rd a 2 corresponding representation of the existing structure for attaching the reinforcement device,
• 4th a 3rd corresponding representation with an anchored anchoring element,
• 5 a 4th corresponding representation with an applied reinforcement layer,
• 6th a schematic representation of the inclined arrangement of a textile reinforcement,
• 7th a 1 corresponding representation of a reinforcement device according to a second embodiment,
• 8th a 6th corresponding representation of a textile reinforcement in a modified fanning out,
• 9 a detailed representation of a fanning out of yarns for a textile reinforcement,
• 10 a 9 corresponding representation of an alternative fanning out of the yarns,
• 11 a 5 corresponding representation of a reinforcement arrangement according to a third embodiment with a support element,
• 12th an enlarged sectional view of the support element in FIG 11 ,
• 13th a view of the support element according to arrow XIII in 12th ,
• 14th a 11 corresponding illustration for attaching the in 11 illustrated reinforcement device,
• 15th a 14th corresponding illustration with anchored support element,
• 16 a side view of the reinforcement arrangement according to FIG 15th ,
• 17th a side view of an existing building with a reinforcement arrangement according to a fourth embodiment,
• 18th an enlarged detailed view of a sectional view according to section line XVIII-XVIII in 17th ,
• 19th an enlarged sectional view of the support element according to FIG 18th ,
• 20th a view of the support element in 19th according to arrow XX,
• 21st a side view of the anchoring element according to 18th ,
• 22nd a further cross-sectional view of an existing structure with a reinforcement device,
• 23 an enlarged detailed representation of the detail XXIII in 22nd ,
• 24 a 11 corresponding representation of a reinforcement device according to a fifth embodiment,
• 25th a 11 corresponding representation of a reinforcement arrangement according to a sixth embodiment,
• 26th a 13th corresponding representation of the support element according to 25th ,
• 27 a 11 corresponding representation of an existing building with a reinforcement device according to a seventh exemplary embodiment,
• 28 a sectional view according to section line XXVIII-XXVIII in 27 ,
• 29 a 26th corresponding representation of the support element according to 27 ,
• 30th a 11 corresponding representation of a reinforcement device according to an eighth embodiment,
• 31 a 11 corresponding representation of a reinforcement device according to a ninth embodiment,
• 32 a 1 corresponding representation for the production of the reinforcement device according to FIG 31 ,
• 33 a 12th corresponding representation of the support element in 31 ,
• 34 an enlarged sectional view of a deflecting element of the reinforcement device according to FIG 31 ,
• 35 a 3rd corresponding representation of an existing structure for attaching the reinforcement device according to 31 ,
• 36 a 31 corresponding representation for the production of the reinforcement device according to FIG 31 ,
• 37 a 11 Corresponding illustration of a reinforcement device according to a tenth exemplary embodiment.

One in 1 to 5 illustrated reinforcement arrangement 1 includes an existing structure 2 made of concrete with steel reinforcement 3rd . The existing structure 2 is designed as a T-beam. The existing structure 2 has a longitudinal axis 4th along which the T-shaped cross section extends.

At the existing structure 2 a reinforcement device marked overall with 5 is attached. The reinforcement device 5 is on an outside surface 6th of the existing structure 2 arranged.

The reinforcement device 5 comprises a reinforcement layer 7th that are on the outer surface 6th is appropriate. The reinforcement device 5 comprises at least one anchoring element 8th with which the reinforcement layer 7th on the existing structure 2 is anchored. The reinforcement layer 7th comprises a make coat 9 , which has textile concrete in particular as a binding agent, and a reinforcement layer 11 . Textile concrete is an artificial composite material and comprises concrete and a reinforcement textile 10 to absorb tensile forces. High-performance continuous fibers such as alkali-resistant glass or carbon fibers can be used as textiles. These fibers have the advantage of not rusting. A textile scrim consists of yarns, which in turn are composed of many continuous fibers, so-called filaments, and can be processed into grid-like structures on textile machines. The reinforcement textile 10 forms a so-called basic network. The reinforcement textile 10 is part of the binder layer 9 . The reinforcement textile 10 is not on the existing structure 2 anchored. The reinforcement textile 10 is with the binder layer 9 on the existing structure 2 appropriate.

On the anchoring element 8th is the reinforcement layer 11 anchored. The reinforcement layer 11 is designed as a textile bundle with a fan.

The reinforcement layer 11 is between two layers of binder 9 completely embedded. In particular, the reinforcement layer is 11 parallel and corresponding to the reinforcement textile 10 arranged.

Along the longitudinal axis 4th of the existing structure 2 are several anchoring elements 8th in the existing building 2 anchored. The anchoring element 8th is in particular a concrete screw with a self-tapping external thread in a drill hole made for this purpose in the existing structure 2 is screwed in. The external thread forms an anchoring section 60 .

The reinforcement layer 11 has an upper, the anchoring element 8th facing fanning section with one extending along the vertical 19th extending fan-out length L _A. The fan-out section corresponds to the textile bundle 12th . Right with the fanning section connected is the overlap section, which is the subject 13th corresponds to. The lap section has a lap length L _G. In particular, the lap length L _{G is} greater than the fanned out length L _A. In particular: L _G ≥ 1.5. L _A , in particular L _G ≥ 2.0. L _A , in particular L _G ≥ 2.5. L _A and in particular L _G ≥ 3.0. L _A.

One along the long axis 4th directed distance a between two adjacent compartments 13th the reinforcement system 11 is at most a third of one along the longitudinal axis 4th directed distance e between two adjacent anchoring elements 8th .

The following is based on 3rd to 5 the attachment of the reinforcement device 5 on the existing structure 2 explained in more detail.

First is the exterior surface 6th of the existing structure 2 cleaned and prepared. In particular, the outside is 6th roughened by high pressure water jets. Then a borehole is made 15th by means of a drilling tool 14th , in particular a hammer drill, for example by means of a hammer hole or by means of a core hole. Thereby the borehole 15th with an angle of inclination n with respect to a first surface section 16 the outer surface 6th inclined. According to the exemplary embodiment shown, the angle of inclination n is 80 °. The angle of inclination n is determined in particular in such a way that the steel reinforcement 3rd of the existing structure 2 is not damaged or impaired. The borehole 15th in particular has a setting depth h _ef . The vertical distance of the borehole tip from the first surface section is used as the setting depth h _ef 16 Are defined. The outside surface 6th furthermore has a second surface section 17th on, the one with the first surface section 16 connected is. The surface sections 16 , 17th are oriented transversely and, according to the exemplary embodiment shown, perpendicular to one another.

As in 4th shown is in the borehole 15th the anchoring element 8th set and by means of a hardening adhesive 18th and / or by means of a form fit in the borehole 15th anchored. Then an on the first surface section 16 previous section 8a of the anchoring element 8th away.

Then on the second surface section 17th first a first layer of binder 9 applied in which the reinforcement textile 10 is introduced as a basic network. Then the reinforcement layer 11 with the textile bundle 12th and the fan 13th into the anchoring element 8th inserted and positively connected to it. In particular, the textile bundle 12th with the fan 13th in a hole not shown in the anchoring element 8th recorded. The positive connection of the textile bundle 12th with the anchoring element 8th takes place in particular by means of an adhesive connection. In particular, the textile bundle is 12th with the fan 13th in the bore of the reinforcement element 8th glued in. The subjects 13th the reinforcement layer 11 becomes in the binder layer 9 introduced, like this in 1 is shown. This state is in 2 shown.

This is followed by a second layer of binder 9 on the reinforcement layer 11 upset. According to 5 is the reinforcement layer 11 completely between two layers of binder 9 embedded.

6th shows a schematic arrangement of an installation variant with an oblique or rotated basic network. In order to bring the textile bundle into overlap with the basic network, the reinforcement layer 11 with an angle of rotation s with respect to the vertical 19th to be ordered. According to the exemplary embodiment shown, the angle of rotation s is 45 °.

In the following, reference is made to 7th a second embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the first exemplary embodiment, to the description of which reference is hereby made. Parts that are structurally different but functionally identical have the same reference numerals with an a after them.

The reinforcement device 5a differs from the first embodiment in that the reinforcement textile 10a , i.e. the basic network, in the binder layer 9 Is arranged at an oblique angle.

So that the reinforcement device 5a an increased strength of the existing structure 2 is made possible by arranging the reinforcement layer at an oblique angle 11 , especially the subject 13a advantageous. According to the embodiment shown, the textile bundle 12a the reinforcement layer 11a fanned out in a special way around the fan 13a to be arranged at an oblique angle. In this embodiment variant, the textile bundle 12a , that is to say the fanning-out section, has a fanning-out length L _{A which is} larger than in the first exemplary embodiment.

According to the exemplary embodiment shown, the fanning out in the fanning out section takes place in particular in that the yarns located laterally on the outside 20th are guided essentially horizontally and vertically. These outside yarns 20th stretch the textile bundle 12a on. The yarns in between 20th are each with a constant angular distance between the two external yarns 20th oriented aligned and in accordance with the grid of the basic network 10a relocated. In the fanning section are a plurality of transverse yarns 21st arranged around the fanned out section of the reinforcement layer 11 to stabilize.

In the following, reference is made to 8th described a modified fanning out.

The reinforcement layer 11a is suitable to be arranged in correspondence with an obliquely angled basic network. In contrast to the in 7th reinforcement position shown 11a the outer yarns extend 20th across the horizontal and across the vertical. The orientation of the outer yarns 20 is such that at least one of the yarns 20th , in the present case the upper, the first surface section 16 of the existing structure 2 facing yarn 20th has a minimum length, so that the fanned-out length L _{A is} reduced and, in particular, is minimal. This means that the lap length L _G for the reinforcement layer 11a is maximum. The reinforcement layer 11a enables support over as large an overlap length L _G as possible.

In the following, using 9 and 10 Details on the fanning of the yarns 20th a reinforcement layer 11 explained in more detail.

For anchoring the reinforcement layer 11 in the anchoring element 8th the yarns are gathered in a circular bundle. Outside the anchoring element 8th will separate the bundle into individual yarns 20th Cut. According to the embodiment shown, there are thirteen yarns 20th provided, which are arranged in three rows. There are four yarns each in an upper and lower row 20th arranged side by side. In the second intervening row there are five yarns 20th arranged side by side. The second row is offset from the first and third rows by half a yarn diameter. 9 and 10 each show the yarn 20th with the yarn diameter D _G , the course of the individual yarns 20th , especially the guidance of the yarns within the reinforcement layer 11 is symbolized as a line for reasons of illustration.

When the reinforcement layer is fanned out 11 according to 9 the yarns are guided in such a way that the yarn lying on the outside of the upper row is guided to the outside in each case. The closest yarn 20th is formed by the outer yarn in the second row. The closest yarn is formed by the outer yarn in the third row. The fourth thread is correspondingly formed by the second thread lying on the outside in the upper row, the fifth thread by the second thread lying on the outside in the second row and the sixth thread by the second thread arranged on the outside in the third row. The seventh and thus middle yarn is formed by the middle yarn arranged in the second row. This middle yarn forms an axis of symmetry of the reinforcement layer 11 .

In the 9 Reinforcement layer shown 11 has a minimum radius Rmin that is comparatively small. This is the distance from the yarns 20th in series up to the first cross yarn 21st , so the fanned out length L _{A is} minimal. The fanning of the yarns 20th according to 9 corresponds to the reinforcement position 11 according to 1 .

The fanning of the yarns according to 10 , in particular the order of the yarns from left to right is identical too 9 listed. An essential difference is that the minimum bending radius Rmin for the reinforcement layer 11 according to 10 is made larger. The distance from the yarns in the row arrangement to the first transverse yarn is corresponding 21st enlarged.

In the following, reference is made to 11 to 16 a third embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with a subsequent b.

The reinforcement device 5b has a support element 22nd on that to support the reinforcement layer 7th on the existing structure 2 serves. The support element 22nd is made of metal, in particular steel and / or UHPC, and has a substantially wedge-shaped cross-sectional shape. The support element 22nd has a first contact surface 23 and a second contact surface 24 on the via a connection surface 25th are connected to each other. The first contact surface 23 has just been carried out. The second contact surface 24 has just been carried out. The interface 25th points in a plane perpendicular to a profile axis 26th of the support element 22nd perpendicularly oriented plane has a curve or a kink. According to the exemplary embodiment shown, the contour is the connecting surface 25th curved, in particular in the shape of a circular arc.

The holding surface 33 connects the first contact surface 23 with the second contact surface 24 and is particularly the interface 25th arranged opposite one another. The holding surface 33 is especially designed to be flat in sections. The holding surface 33 particularly connects the two end faces 29 .

The support element 22nd has one or two main through-holes 27 on that for performing the anchoring element 8th serve. There can also be more than two main through-holes 27 be provided. The main through hole 27 is at an angle of inclination n with respect to the first contact surface 23 arranged. This angle of inclination n corresponds to the angle of inclination between the borehole 15th and the first surface section 16 according to 3rd . The borehole 15th With this variant, it can also be retrofitted through the main through-hole 27 be created through it.

In the support element 22nd is a connection textile 28 integrated, each on the front sides 29 as an extension of the first contact surface 23 and the second contact surface 24 from the support element 22nd from stretches.

The following is based on the 14th to 16 the attachment of the reinforcement device 5b explained in more detail.

As already explained, the existing building will be 2 first cleaned by high pressure water jets and a first layer of binder 9 with a basic network 10 applied to the existing structure. In order to enable the support element to be attached later, the transition area is 30th between the first surface section 16 and the second surface section 17th arranged. In the transition area 30th is the textile concrete layer 9 cut out with the basic net. There are also two injection rails 31 provided to the transition area 30th to keep clear.

Then it is in the transition area 30th a leveling concrete 32 introduced and the support element 22nd in the leveling concrete 32 used and the connecting fabric 28 incorporated and a second binder layer 9 applied. Then the anchoring element 8th for example in the form of a concrete screw through the main through hole 27 of the support element 22nd into the previously created borehole 15th guided and anchored there. The support element 22nd is at its holding surface 33 by means of a washer 34 and a fastening nut 35 held.

Through the protruding sections of the connecting fabric 28 that is in the reinforcement layer 7th is arranged, has the support element 22nd one along the first surface section 16 arranged first reinforcement length L _{v, 1} and one along the second surface portion 17th oriented second reinforcement length L _{V, 2} . In particular: L _{V, 1} 25 cm, in particular L _{V, 1} 30 cm, in particular L _{v, 1} ≥ 35 cm, in particular L _{v, 1} 40 cm, in particular L _{V, 1} 50 cm, in particular L _{V , 2} ≥ 25 cm, in particular L _{V, 2} ≥ 30 cm, in particular L _{V, 2} ≥ 35 cm, in particular L _{V, 2} ≥ 40 cm, in particular L _{V, 2} ≥ 50 cm.

The support element 22nd has two secondary through-holes 36 on. Through the secondary through holes 36 Mounting screws, not shown, can be guided around the support plate 22nd to be fixed to the existing structure, especially while the support element 22nd into the make coat 9 is embedded, or during the borehole 15th through the main through hole 27 of the support element 22nd is created. This means that in the embodiment shown, the borehole 15th before or during the setting of the support element 22nd is drilled.

As in particular in 16 can be seen are along the longitudinal axis 4th several support elements 22nd intended. One between two adjacent support elements 22nd remaining space 37 can be filled with textile fabric by means of a binder layer for a seamless transition between the support elements.

In the following, reference is made to 17th to 21st a fourth embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with a suffix c.

In the fifth embodiment, the existing building is 2 a T-beam, at the top of which an external load F is introduced centrally. The existing structure 2 is on two supports, each arranged on the underside 38 supported, which provide a bearing force F _{A to} absorb the external force F.

At the existing structure 2 there are eleven support elements on each side 22c arranged and each by means of an anchoring element 8c in the existing building 2 anchored.

In contrast to the previous embodiment, the reinforcement layer 7th with the binder layer 9 and the reinforcement position 11 continuously on the outer surface 6th of the existing structure 2 arranged, in particular also in the transition area 30th between the surface sections 16 and 17th . From an outside of the reinforcement layer 7th is leveling concrete 32 provided on which the support element 22c attached and by means of the anchoring element 8c is anchored.

The following is based on the 21st the anchoring element 8c explained in more detail. The Anchoring element 8c is designed as a concrete screw, especially of the TSM type B16 / 220 . From an introducer 39 extends on the shaft 40 an external thread 41 . In one of the introductory 39 facing area, the external thread has cutting elements, in particular cutting teeth 42 on. The external thread is in this area 41 designed as a cutting thread. The concrete screw can go into the borehole 15th immediately screwed in and anchored in it. The cutting thread cuts a thread helix into the inner wall of the borehole 15th . The cutting thread forms an anchoring section 60 .

The external thread has in the remaining area 41 no cutting elements. The external thread is in this area 41 designed as a supporting thread. With the support thread, the concrete screw is reliably held in the borehole, in particular in the thread cut by the cutting thread on the inner wall of the borehole. The external thread 41 extends along the longitudinal axis of the screw 43 along a thread section A _G. The threaded section A _G is followed by a thread-free shank section A _SCH and the shank section is followed by a holding section A _H and a tool section Aw. The tool section Aw is at one of the insertion ends 39 opposite outer end 44 of the shaft 40 arranged.

In the tool section is the concrete screw 8c with one perpendicular to the longitudinal axis of the screw 43 oriented non-circular outer contour executed. According to the exemplary embodiment shown, the tool section has an external hexagon contour.

The holding section A _H has a holding disk 45 on that on a bottom of a hexagon nut 35 is arranged.

The retaining washer 45 prevents unintentional loosening of the connection, especially under dynamic loads. The retaining washer 45 is designed in particular as a so-called Nordlock element. The retaining washer 45 enables angle compensation. It is possible to use the retaining washer 45 in addition to the washer 34 or instead of the washer 34 to use.

The holding section A _H has a metric external thread that connects to the internal thread of the fastening nut 35 corresponds. By means of the fastening nut 35 can the retaining washer 45 axially along the longitudinal axis of the screw 43 be relocated. This allows the support element 22c to the reinforcement layer 7th defined by a contact force. The pressing force is in particular at least as great as the deflecting force or greater. The contact pressure is to be based in particular on the tensile force of the textile reinforcement.

In 22nd and 23 a variant of a T-beam bridge with two T-shaped girders is shown. Anchoring elements are located on both sides of each of the T-shaped girders 8th and support elements 22nd intended.

In the following, reference is made to 24 a fifth embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with a subsequent d.

At the reinforcement device 5d is the support element 22d as in the previous embodiment using compensating concrete 32 on the reinforcement layer 7th put on.

The support element 22d is designed as a pipe segment with an opening angle o. According to the exemplary embodiment shown, the opening angle is 107 °. It is advantageous if the opening angle is less than 120 °. Three support elements can be produced from a pipe cross-section by longitudinal separation, in particular by having the main through-hole in the pipe segment 27 and two secondary through holes 36 are manufactured. With the support element 22d is the holding surface 33d formed by the inner surface of the pipe blank. The holding surface 33d is uneven, especially curved. To ensure a reliable and secure attachment of the support element 22d by means of the anchoring element 8th to enable is the retaining washer 45d Dome-shaped. The support element 22d facing surface of the retaining disc 45d is designed in particular curved, the curvature of the retaining plate 45d the curvature of the inner surface of the tubular segment of the support member 22d corresponds to.

In the following, reference is made to 25th and 26th a sixth embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with an e after them.

As in the previous embodiment, the support element 22e a pipe segment which, according to the exemplary embodiment shown, comprises an opening angle o of 90 °. One piece with the pipe segment 46 is a sheet steel 47 connected, which are welded together in the transition area. For stiffening the support element 22e are two stiffening lamellas 48 intended. The stiffening slats 48 are parallel to each other and perpendicular to the steel sheet 47 arranged and with the steel sheet 47 and the pipe segment 46 welded. Between the two stiffening slats 48 is the main through hole 27 arranged. On opposite outer sides of the stiffening lamellas 48 are the secondary through holes 36 arranged.

In particular, the main through-hole 27 and the minor through hole 36 in sheet steel 47 arranged.

According to the embodiment shown, the support element is 22e with the pipe segment 46 in the transition area 30th between the first surface section 16 and the second surface section 17th of the existing structure 2 arranged. The flat sheet steel 47 is parallel to the first surface section 16 on the existing structure 2 arranged. The anchoring element is corresponding 8th with an inclination angle n of 90 ° in the existing building 2 anchored.

In the following, reference is made to 27 to 29 a seventh embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with an f after them.

Compared to the previous exemplary embodiments, the existing structure is 2 here with a portal section 49 executed. The portal section 49 has two vertical supports 50 and a horizontal connecting portion 51 on the two vertical supports 50 connects with each other. According to the embodiment shown, the support element is 22f designed in such a way that it extends over the entire width B between the vertical supports 50 or the reinforcement layers attached to it 7th extends.

The support element 22f is designed as a high suspension beam. The support element 22f has a centered between two pipe segments 46 arranged T-beam. The head of the T serves as a flat sheet of steel to place on the reinforcement layer 7th . The main through-holes are on the head of the T 27 arranged. The base of the T extends perpendicularly away from the reinforcement layer 7th and the base of the T serves as a stiffening lamella 48 . It is advantageous that the T-profile is made in one piece. The T-profile is particularly stable and robust.

The pipe segments 46 essentially correspond to those of the previous exemplary embodiment. How in particular 29 can be seen, are the main through holes 27 designed as elongated holes. This enables fine positioning of the support element 22f on the existing structure 2 changeably possible. The assembly of the hanging bracket is simplified.

In the following, with reference to 30th an eighth embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical are given the same reference numerals with a subsequent g.

The main difference, in particular compared to the sixth embodiment according to FIG 22nd is that the support element 22g is made from a round rod. In particular, the round bar is longitudinally separated into two semicircular profiles and then the main through-hole centrally 27 inserted. The manufacture of the support element 22g is uncomplicated and especially possible from a semi-finished product. The arrangement and anchoring of the support element 22g on the existing structure 2 corresponds to the previous exemplary embodiments, to which reference is hereby made.

In the following, reference is made to 31 to 36 a ninth embodiment is described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but functionally identical have the same reference numerals with an h after them.

A major difference compared to the previous embodiments is that the reinforcement layer 11 is not anchored directly to the anchoring element. According to the embodiment shown, the support element 22h an angle profile 52 on. Between the two legs of the angle profile, which are oriented essentially perpendicular to one another 52 is a cross brace 53 attached, in particular welded. Due to the angle of inclination of the cross brace 53 opposite the legs of the angle profile 52 becomes the angle of inclination n for the main through hole 27 set. The main through hole 27 extends both through the cross brace 53 as well as by the first contact surface 23 forming leg of the angle profile 52 .

On which the second contact surface 24 forming leg of the angle profile 52 is a cylindrical mandrel in an opening 54 attached. The cylindrical mandrel extends essentially perpendicularly from the second leg of the angle profile 52 . On the thorn 54 is a pulley 55 with a through hole 56 attachable. The pulley 55 serves to redirect the reinforcement layer 11 . The pulley 55 is a deflection element. The reinforcement layer 11 is about the pulley 55 and the thorn 54 on the angle profile 52 held. The angle profile 52 is by means of the anchoring element 8c anchored in the existing structure. The probation 11 is through the anchoring element 8c indirectly on the existing structure 2 anchored.

It is advantageous if the outer radius of the deflection element is selected so that the transverse pressure can be absorbed by the reinforcement materials selected. It is advantageous if the outer diameter R _{A is} at least 12 mm, in particular at least 13 mm, in particular at least 14 mm, in particular at least 15 mm, in particular at least 17 mm, in particular at least 20 mm.

For attaching the reinforcement device 5h will first be the existing structure 2 cleaned by high pressure water jets and the support element 22h anchored to the existing structure by means of the anchoring element 8c then a first binder layer is applied 9 with the reinforcement textile 10 on the existing structure 2 attached and applied. Then there is a reinforcement layer 11 on the pulley 55 hung and the pulley 55 on the thorn 54 put on. Then the reinforcement layer 11 by means of a further binder layer 9 in the reinforcement layer 7th embedded. Additional reinforcement layers can be used for further reinforcement 11 pushed onto the mandrel in the same way and in particular by means of a safety split pin 57 secured against unintentional loosening.

In the following, reference is made to 37 a tenth embodiment of the invention described. Structurally identical parts are given the same reference numerals as in the previous exemplary embodiments, the description of which is hereby referred to. Parts that are structurally different but of the same type are given the same reference numerals with an i after them.

Compared to the previous exemplary embodiments, the main difference of this embodiment is that in the case of the reinforcement device 5i a holding plate 58 is provided by means of connecting screws 59 with the support element 22i connected is. The holding plate 58 has in particular a rough and / or profiled surface that corresponds to the first surface section 16 of the existing structure 2 is facing.

Between the holding plate 58 and the support element 22i is the reinforcement layer 7th with three layers of binder 9 and two layers of reinforcement in between 11 executed. The support element 22i is designed essentially as a flat disk with an inclination angle n of 90 ° with respect to the first surface section 16 is arranged inclined.

The embodiment shown has the particular advantage that the support element 22i can be produced by flat steel components. The manufacturing effort and the associated costs are reduced.

Claims (15)

A reinforcement device for an existing building (2) comprising a. a reinforcement layer (7) which can be attached to an outer surface (6) of the existing structure (2), b. at least one anchoring element (8; 8c) with which the reinforcement layer (7) can be anchored to the existing structure (2). Reinforcement device according to Claim 1 , characterized by at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) for supporting the reinforcement layer (7) on the existing structure (2). Reinforcement device according to Claim 2 , characterized in that the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) has a first contact surface (23) and a second contact surface (24) for contact with the reinforcement layer (7). Reinforcement device according to Claim 3 , characterized in that the first contact surface (23) and / or the second contact surface (24) has a defined surface roughness and / or a surface structure. Reinforcement device according to Claim 3 or 4th , characterized in that the first contact surface (23) and / or the second contact surface (24) is at least partially curved. Reinforcement device according to one of the Claims 2 to 5 , characterized in that the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) comprises metal, in particular steel, aluminum and / or iron materials, carbon fibers and / or ultra-high-strength concrete. Reinforcement device according to one of the Claims 2 to 6th , characterized in that the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) has a main through-hole (27) for leading through the at least one anchoring element (8; 8c). Reinforcement device according to one of the Claims 2 to 7th , characterized by at least one fixing element for fixing the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) to the existing structure (2), in particular before the at least one support element (22; 22c; 22d; 22e) ; 22f; 22g; 22h; 22i) is anchored to the existing structure (2), in particular the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) having a secondary through-hole (36) to pass through of the at least one fixing element. Reinforcement device according to one of the Claims 2 to 8th , characterized in that the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) has a full cross-section or a profile cross-section, in particular the at least one support element (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) has a cross-sectional shape which is essentially rectangular, circular, ring-shaped or wedge-shaped. Reinforcement device according to one of the preceding claims, characterized in that the reinforcement layer (7) has at least one binder layer (9), in particular with a textile reinforcement (10; 10a), and a flexible reinforcement layer (11; 11a), which in particular in the at least a binder layer (9) is embedded. Reinforcement device according to one of the preceding claims, characterized in that the at least one anchoring element (8; 8d) has an anchoring section (60) for anchoring in the existing structure (2) and a holding section (A _H ) for holding the support element (22; 22c; 22d ; 22e; 22f; 22g; 22h; 22i). Reinforcement arrangement with an existing structure (2) and a reinforcement device (5; 5a; 5c; 5d; 5i) attached to it according to one of the preceding claims. Reinforcement arrangement according to Claim 12 , characterized in that a plurality of support elements (22; 22c; 22d; 22e; 22f; 22g; 22h; 22i) are provided along a longitudinal axis (4) of the existing structure (2), each of which is attached by means of at least one anchoring element (8; 8c) are anchored to the existing structure (2). Reinforcement arrangement according to Claim 12 or 13th , characterized in that an outer surface (6) of the existing building (2) has a first surface section (16) and a second surface section (17) which are oriented transversely and in particular perpendicular to one another. Method for strengthening an existing building with a strengthening device according to one of the Claims 1 to 11 comprising the process steps - providing an existing structure (2), in particular a reinforced concrete beam, - attaching the reinforcement layer (7) to an outer surface (6) of the existing structure (2), - anchoring the reinforcement layer (7) by means of the at least one anchoring element (8); 8c).

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