EP3819431B1 - Agencement de renfort au moyen d'une construction existante et d'un dispositif de renfort appliqué à celle-ci ainsi que procédé de renforcement d'une construction existante - Google Patents

Agencement de renfort au moyen d'une construction existante et d'un dispositif de renfort appliqué à celle-ci ainsi que procédé de renforcement d'une construction existante Download PDF

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Publication number
EP3819431B1
EP3819431B1 EP20206236.0A EP20206236A EP3819431B1 EP 3819431 B1 EP3819431 B1 EP 3819431B1 EP 20206236 A EP20206236 A EP 20206236A EP 3819431 B1 EP3819431 B1 EP 3819431B1
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EP
European Patent Office
Prior art keywords
reinforcement
existing structure
arrangement according
layer
anchoring
Prior art date
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Application number
EP20206236.0A
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German (de)
English (en)
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EP3819431B8 (fr
EP3819431A1 (fr
Inventor
Jürgen Feix
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CBP Guideway Systems GmbH
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CBP Guideway Systems GmbH
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Publication of EP3819431A1 publication Critical patent/EP3819431A1/fr
Publication of EP3819431B1 publication Critical patent/EP3819431B1/fr
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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
    • E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/01—Reinforcing elements of metal, e.g. with non-structural coatings
    • E04C5/02—Reinforcing elements of metal, e.g. with non-structural coatings of low bending resistance
    • E04C5/04—Mats
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/07—Reinforcing elements of material other than metal, e.g. of glass, of plastics, or not exclusively made of metal
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G23/00—Working measures on existing buildings
    • E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
    • E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
    • E04G2023/0251—Increasing or restoring the load-bearing capacity of building construction elements by using fiber reinforced plastic elements
    • E04G2023/0262—Devices specifically adapted for anchoring the fiber reinforced plastic elements, e.g. to avoid peeling off

Definitions

  • the invention relates to a reinforcement arrangement with an existing structure and a reinforcement device attached thereto, as well as a method for reinforcing such an existing structure.
  • Mechanically stressed existing structures such as bridge girders are subject to wear. The 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 permitted, particularly for use in road traffic.
  • U.S. 2005/0252142 A1 discloses an anchoring system for structural reinforcement.
  • U.S. 6,003,276 discloses the strengthening of cementitious walls against earthquakes.
  • U.S. 2009/0013625 A1 discloses a reinforcement structure for buildings.
  • the object of the invention is to improve the load-bearing capacity of an existing structure and in particular to increase the actual load-bearing capacity of the existing structure.
  • a reinforcement device can be attached to an existing structure.
  • An existing building has in particular concrete, in particular steel-reinforced concrete.
  • the reinforcement device has a reinforcement layer that can be attached to an outer surface of the existing structure.
  • the reinforcement layer can be connected to the existing structure, in particular over a large area and in particular over a large area.
  • the reinforcing layer can be applied to an outer surface of the existing building that is essentially of any shape.
  • the reinforcement layer enables a large-scale connection with the existing building.
  • the overall flexible reinforcement layer can be adapted to the outer surface of the existing building at side wall transitions and/or the edge areas of the existing building.
  • the reinforcement device comprises at least one anchoring element with which the reinforcement layer can be anchored to the existing structure.
  • the reinforcement device comprises a plurality of anchoring elements in order to anchor the reinforcement layer at a large number 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 that can be anchored in a drilled hole by means of a curable adhesive compound.
  • the curable adhesive mass can also be used for the concrete screw with the self-tapping external thread in combination.
  • the anchoring element can also be an undercut anchor or an expansion anchor.
  • the reinforcement device is particularly suitable for absorbing deflection forces and/or anchoring forces which occur when the existing building has an uneven outer surface, as is the case with a T-shaped beam.
  • the anchoring elements absorb these deflection forces and/or anchoring forces and anchor them in the existing structure. Through the anchoring elements, the deflection forces and/or anchoring forces are introduced in particular into the component interior of the existing structure. This avoids high surface stresses on the existing building.
  • 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%, using the reinforcement device.
  • the existing structure can continue to be used by attaching the reinforcement device. A costly restoration and/or a new building is not necessary.
  • the use of the amplification device according to the invention saves money and resources.
  • the reinforcement device enables sustainable use of the existing building and is ecologically sensible.
  • a support element 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 in particular concave.
  • the existing building is a T-beam.
  • the outer surface comprises two side surfaces arranged transversely and in particular perpendicularly to one another, it being possible for the at least one support element to be attached at the transition, in particular at the joint of the side surfaces.
  • several support elements are provided along the edge between the side faces of the existing structure.
  • the reinforcement arrangement according to the invention in which a reinforcement device is attached to an existing structure, essentially has the advantages of the reinforcement device, to which reference is hereby made.
  • the reinforcement arrangement according to the invention in which an outer surface of the existing structure has a first surface section and a second surface section, which are oriented transversely to one another, enables the forces on existing structures with different surface sections, which are oriented transversely to one another, to be deflected.
  • the two surface sections are oriented perpendicular to one another.
  • Such an existing structure is, for example, a T-beam-shaped bridge girder.
  • An angle of inclination between the surface sections of the existing building is in particular between 50° and 110°, in particular between 80° and 100° and in particular between 85° and 95° and in particular exactly 90°.
  • the reinforcement arrangement according to the invention in which the at least one support element has a main through-bore through which the anchoring element is guided, enables the anchoring element to be passed directly through the support element.
  • the support element can be advantageously used by means of the anchoring element to support the reinforcement layer.
  • the main through hole is arranged in a region between the first contact surface and the second contact surface.
  • the main through bore is arranged at an angle of inclination relative 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°.
  • the reinforcement arrangement according to the invention in which the reinforcement layer has at least one binder layer with a textile reinforcement and a flexible Has probationary layer, which is embedded in the at least one layer of binder, 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.
  • the flexible reinforcement layer is arranged on the binding agent 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 a textile reinforcement and includes in particular reinforcing fibers, in particular glass fibers and/or carbon fibers.
  • the fibers can be arranged randomly as a non-crimp fabric and/or as a woven fabric, 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-grained 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 number of individual layers, in particular a first binder layer and a second binder layer, with the flexible reinforcement layer being 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 binding agent layer.
  • a reinforcement arrangement with a support element according to claim 2 ensures a defined contact with the reinforcement layer and thus a defined support of the reinforcement layer on the existing structure.
  • 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 are oriented essentially perpendicularly, ie with a 90° angular orientation of their surface normals to one another.
  • a reinforcement arrangement according to claim 3 enables defined, in particular increased adhesion conditions between the support element and the reinforcement layer.
  • the contact surfaces have a defined surface roughness. It is advantageous if the contact surfaces have a coefficient of friction, which is also referred to as a coefficient of friction or 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.
  • the contact surfaces can have a surface structure, in particular in the form of, in particular, raised, ribbing and/or grids, at least in certain areas or completely. It is advantageous if the 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 rastering forms an elevation in some areas 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 for the ribbing and/or rastering to be negative, that is to say as a depression on the contact surface, in particular in the form of grooves or grooves.
  • a reinforcement arrangement according to claim 4 enables the support element to rest better against an uneven outer surface of the existing structure.
  • the contact surfaces are curved with respect to an axis which is oriented parallel to a profile axis of the support element.
  • the support element is designed in the manner of a profile, with the support element having a substantially constant, that is to say unchangeable, surface cross-section along the longitudinal axis of the profile.
  • a reinforcement arrangement according to claim 5 is designed to be particularly robust.
  • the reinforcement device is durable.
  • the supporting element can have ultra-high performance concrete (UHFB) or according to the English-language abbreviation UHPC.
  • UHPC has a particularly high impermeability and strength.
  • 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.
  • 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 arrangement according to claim 6 facilitates the attachment of the support element to the existing structure.
  • a mounting screw is used as a fixing element, which can be selected, in particular, through an auxiliary through-bore of the support element.
  • two secondary through-holes are provided on the support element, through which a fixing element, ie a mounting screw, can be used to fasten the support element to the existing structure.
  • a reinforcement arrangement according to claim 7 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 in a supportive manner.
  • a cross-sectional shape of the support element is, in particular, essentially rectangular with broken edges, that is to say with rounded edges.
  • the support element can also have a triangular or wedge-shaped cross-section, in particular in the form of a right-angled triangle with broken, ie rounded edges.
  • a reinforcement arrangement according to claim 8 ensures 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 by a screw head, for example.
  • the anchoring element in the retaining section can have an external thread, in particular a metric thread, onto which a retaining nut can be screwed.
  • a reinforcement arrangement according to claim 9 enables a reliable attachment of the reinforcement device along a longitudinal extent of the existing structure. In particular, a large-scale deflection of the forces occurring on the existing structure is guaranteed.
  • a method according to claim 10 enables an immediate increase in the actual load-bearing capacity of an existing structure.
  • the reinforcement arrangement 1 shown comprises an existing structure 2 made of concrete with steel reinforcements 3.
  • the existing structure 2 is designed as a T-beam.
  • the existing structure 2 has a longitudinal axis 4 along which the T-shaped cross section extends.
  • a reinforcement device marked overall with 5 is attached on the existing structure 2.
  • the reinforcement device 5 is arranged on an outer surface 6 of the existing structure 2 .
  • the reinforcement device 5 comprises a reinforcement layer 7 attached to the outer surface 6 .
  • the reinforcement device 5 comprises at least one anchoring element 8 with which the reinforcement layer 7 is anchored to the existing structure 2 .
  • the reinforcement layer 7 comprises a binder layer 9, which has textile concrete as the binding agent, and a reinforcement layer 11.
  • the textile concrete is an artificial composite material and comprises concrete and a reinforcement textile 10 for absorbing tensile forces.
  • High-performance continuous fibers such as, for example, alkali-resistant glass or carbon fibers can be used as textiles. These fibers have the advantage of not rusting.
  • a textile fabric consists of yarns, which in turn are composed of many endless fibers, so-called filaments, and can be processed into lattice-like structures on textile machines.
  • the reinforcement textile 10 forms a so-called basic network.
  • the reinforcing textile 10 is part of the binder layer 9.
  • the reinforcing textile 10 is not anchored to the existing structure 2.
  • the reinforcing textile 10 is attached to the existing structure 2 with the binding agent layer 9 .
  • the reinforcement layer 11 is anchored to the anchoring element 8 .
  • the reinforcement layer 11 is designed as a textile bundle with compartments.
  • the reinforcement layer 11 is completely embedded between two binder layers 9 .
  • the reinforcement layer 11 is arranged parallel and corresponding to the reinforcement textile 10 .
  • anchoring elements 8 are anchored in the existing building 2 along the longitudinal axis 4 of the existing building 2 .
  • the anchoring element 8 is in particular a concrete screw with a self-tapping External thread is screwed into a drill hole made for this purpose in the existing building 2.
  • the external thread forms an anchoring section 60.
  • the reinforcement layer 11 has an upper fanning-out section facing the anchoring element 8 with a fanning-out length L A extending along the vertical 19 .
  • the fanning-out section corresponds to the textile bundle 12.
  • the overlapping section Directly connected to the fanning-out section is the overlapping section, which corresponds to the fan 13.
  • the overlapping section has an overlapping length L G .
  • the overlapping length L G is greater than the fanning out length L A .
  • L G ⁇ 1.5*L A
  • L G ⁇ 2.5*L A in particular L G ⁇ 3.0*L A .
  • a distance a, directed along the longitudinal axis 4, between two adjacent compartments 13 of the reinforcement system 11 is at most one third of a distance e, directed along the longitudinal axis 4, between two adjacent anchoring elements 8.
  • the outer surface 6 of the existing structure 2 is cleaned and prepared.
  • the outside 6 is roughened by high-pressure water jets.
  • a borehole 15 is then set using a drilling tool 14, in particular a percussion drill, for example by means of a hammer bore or by means of a core bore.
  • the borehole 15 is inclined at an angle of inclination n in relation to a first surface section 16 of the outer surface 6 .
  • the angle of inclination n is 80° according to the exemplary embodiment shown.
  • the angle of inclination n is determined in particular in such a way that the steel reinforcement 3 of the existing building 2 is not damaged or impaired.
  • the borehole 15 has a setting depth h ef .
  • the vertical distance between the tip of the drill hole and the first surface section 16 is defined as the setting depth h ef .
  • the outer surface 6 also has a second surface section 17 which is connected to the first surface section 16 .
  • the surface sections 16, 17 are oriented transversely and, according to the exemplary embodiment shown, perpendicular to one another.
  • the anchoring element 8 is placed in the borehole 15 and anchored in the borehole 15 by means of a hardening adhesive compound 18 and/or by means of a positive fit. A section 8a of the anchoring element 8 protruding from the first surface section 16 is then removed.
  • a first binder layer 9 is then applied to the second surface section 17, in which the reinforcing textile 10 is introduced as a basic network. Thereafter, the reinforcement layer 11 is inserted with the textile bundle 12 and the fan 13 in the anchoring element 8 and non-positively connected thereto.
  • the bundle of textiles 12 with the fan 13 is accommodated in a borehole in the anchoring element 8 that is not shown in detail.
  • the non-positive connection of the bundle of textiles 12 to the anchoring element 8 takes place in particular by means of an adhesive connection.
  • the bundle of textiles 12 with the fan 13 is glued into the bore of the reinforcement element 8 .
  • the compartment 13 of the reinforcement layer 11 is introduced into the binder layer 9, as shown in 1 is shown. This state is in 2 shown.
  • a second binder layer 9 is then applied to the reinforcement layer 11 .
  • the reinforcement layer 11 is completely embedded between two binder layers 9 .
  • the reinforcement layer 11 can be arranged at an angle of rotation s with respect to the vertical 19 . According to the exemplary embodiment shown, the angle of rotation s is 45°.
  • the reinforcing device 5a differs from the first exemplary embodiment in that the reinforcing textile 10a, ie the basic network, is arranged in the binding agent layer 9 at an oblique angle.
  • the reinforcement device 5a enables increased strength of the existing structure 2, an oblique arrangement of the reinforcement layer 11, in particular of the compartment 13a, is advantageous.
  • the textile bundle 12a of the reinforcement layer 11a is fanned out in a special way in order to arrange the fan 13a at an oblique angle.
  • the textile bundle 12a that is to say the fanning-out section, has a fanning-out length L A which is greater than in the first exemplary embodiment.
  • the fanning out in the fanning-out section takes place in particular in that the respective laterally outer yarns 20 are guided essentially horizontally and vertically. These outer yarns 20 span the textile bundle 12a.
  • the intermediate yarns 20 are oriented with each constant angular spacing between the two outer yarns 20 and laid in accordance with the grid of the base net 10a.
  • a plurality of transverse yarns 21 are arranged in the fanning-out section in order to stabilize the fanning-out section of the reinforcement layer 11 .
  • the reinforcement layer 11a is suitable to be arranged in accordance with a skewed base net.
  • the respective outer yarns 20 extend transversely to the horizontal and transverse to the vertical.
  • the orientation of the outer yarns 20 is such that at least one of the yarns 20, in the present case the upper yarn 20 facing the first surface section 16 of the existing structure 2, has a minimum length, so that the fanning-out length L A is reduced and in particular is minimal.
  • This means that the overlap length L G for the reinforcement layer 11a is at its maximum.
  • the reinforcement layer 11a enables support over the greatest possible overlap length L G .
  • the following are based on Figures 9 and 10 Details for fanning out the yarns 20 of a reinforcement layer 11 explained in more detail.
  • the yarns are combined in a circular bundle.
  • the bundle is separated into individual yarns 20 outside of the anchoring element 8 .
  • thirteen yarns 20 are provided, which are arranged in three rows.
  • Four yarns 20 are arranged next to each other in an upper and lower row.
  • five yarns 20 are arranged side by side.
  • the second row is offset from the first and third rows by half a yarn diameter.
  • Figures 9 and 10 each show the yarns 20 with the yarn diameter D G , the course of the individual yarns 20, in particular the guidance of the yarns within the reinforcement layer 11, being symbolized as a line for reasons of illustration.
  • the closest yarn 20 is formed by the outer yarn in the second course.
  • the closest yarn is formed by the outer yarn in the third row.
  • the fourth yarn is respectively formed by the second outside yarn in the top row, the fifth yarn by the second outside yarn in the second row and the sixth yarn by the second outside yarn 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.
  • the reinforcement layer 11 shown has a minimum radius R min which is comparatively small. As a result, the distance from the yarns 20 in the row arrangement to the first transverse yarn 21, ie the fanning-out length L A , is minimal. The fanning out of the yarns 20 according to 9 corresponds to the reinforcement layer 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 to 9 listed. A major difference is that the minimum bending radius R min for the reinforcement layer 11 according to 10 is made larger. Correspondingly, the distance from the yarns in the row arrangement to the first transverse yarn 21 is increased.
  • the reinforcement device 5b has a support element 22 which serves to support the reinforcement layer 7 on the existing structure 2 .
  • the support element 22 is made of metal, in particular steel and/or UHPC, and has an essentially wedge-shaped cross-section.
  • the support element 22 has a first contact surface 23 and a second contact surface 24 which are connected to one another via a connecting surface 25 .
  • the first contact surface 23 is flat.
  • the second contact surface 24 is flat.
  • the connecting surface 25 points perpendicular to a profile axis 26 of the support element 22 in a plane oriented plane on a curvature or a kink.
  • the contour of the connecting surface 25 is curved, in particular in the shape of a circular arc.
  • the holding surface 33 connects the first contact surface 23 to the second contact surface 24 and is in particular arranged opposite the connection surface 25 .
  • the holding surface 33 is designed to be flat, in particular in sections.
  • the holding surface 33 connects in particular the two end faces 29.
  • the support element 22 has one or two main through bores 27 which are used for the anchoring element 8 to pass through. More than two main through bores 27 can also be provided.
  • the main through hole 27 is arranged at an angle of inclination n relative to the first contact surface 23 . This angle of inclination n corresponds to the angle of inclination between the borehole 15 and the first surface section 16 according to 3 .
  • the borehole 15 can also be created subsequently through the main through borehole 27 .
  • a connecting textile 28 is integrated into the support element 22 and extends from the support element 22 at end faces 29 in extension of the first contact surface 23 and the second contact surface 24 .
  • the existing building 2 is first cleaned by high-pressure water jets and a first binder layer 9 with a Basic network 10 applied to the existing building.
  • the transition area 30 is arranged between the first surface section 16 and the second surface section 17 .
  • the textile-reinforced concrete layer 9 is recessed with the base network.
  • two injection rails 31 are provided in order to keep the transition area 30 free.
  • a leveling concrete 32 is then introduced into the transition area 30 and the support element 22 is inserted into the leveling concrete 32 and the connecting textile 28 is integrated and a second layer of binding agent 9 is applied.
  • the anchoring element 8 for example in the form of a concrete screw, is then guided through the main through bore 27 of the support element 22 into the previously created borehole 15 and anchored there.
  • the support element 22 is held at its holding surface 33 by means of a washer 34 and a fastening nut 35 .
  • the support element 22 has a first reinforcement length L V,1 arranged along the first surface section 16 and a second reinforcement length L V,2 oriented along the second surface section 17.
  • the support element 22 has two secondary through holes 36 .
  • Mounting screws (not shown) can be passed through the secondary through-holes 36 in order to mount the support plate 22 on the existing structure to fix, in particular while the support member 22 is embedded in the binder layer 9, or while the borehole 15 through the main through hole 27 of the support member 22 is created. This means that in the exemplary embodiment shown, the borehole 15 is drilled before or during the setting of the support element 22 .
  • support elements 22 are provided along the longitudinal axis 4 .
  • a space 37 remaining between two adjacent support elements 22 can be filled with textile fabric by means of a binding agent layer for a seamless transition between the support elements.
  • the existing structure 2 is a T-beam, on the upper side of which an external load F is introduced centrally.
  • the existing structure 2 is supported on two supports 38 which are each arranged on the underside and which provide a support force F A in order to be able to absorb the external force F.
  • Eleven support elements 22c are arranged on both sides of the existing building 2 and each is anchored in the existing building 2 by means of an anchoring element 8c.
  • the reinforcement layer 7 with the binder layer 9 and the reinforcement layer 11 is arranged continuously on the outer surface 6 of the existing building 2, in particular also in the transition area 30 between the surface sections 16 and 17.
  • leveling concrete 32 is provided, to which the support element 22c is attached and anchored by means of the anchoring element 8c.
  • the anchoring element 8c is designed as a concrete screw, in particular of the TSM B16/220 type.
  • An external thread 41 extends on the shaft 40 from an insertion end 39 . In a region facing the insertion end 39 , the external thread has cutting elements, in particular cutting teeth 42 . In this area, the external thread 41 is designed as a cutting thread.
  • the concrete screw can be screwed directly into the borehole 15 and anchored therein.
  • the cutting thread cuts a thread helix in the inner wall of the borehole 15.
  • the cutting thread forms an anchoring section 60.
  • the external thread 41 has no cutting elements.
  • the external thread 41 is designed as a support thread. With the supporting thread, the concrete screw is held reliably in the drill hole, in particular in the thread cut by the cutting thread on the inner wall of the drill hole.
  • the external thread 41 extends along the longitudinal axis 43 of the screw along a thread section AG .
  • the threaded section A G is followed by an unthreaded shank section A SCH and the shank section is followed by a holding section A H and a tool section A W .
  • the tool section A W is at one dem Introductory 39 opposite outer end 44 of the shaft 40 is arranged.
  • the concrete screw 8c is designed with a non-round outer contour oriented perpendicular to the longitudinal axis 43 of the screw.
  • the tool section has an external hexagonal contour.
  • the holding section A H has a holding washer 45 which is arranged on an underside of a hexagon nut 35 .
  • the retaining disk 45 prevents the connection from being unintentionally released, particularly under dynamic loads.
  • the retaining disk 45 is designed in particular as a so-called Nordlock element.
  • the holding disk 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.
  • the holding section A H has a metric external thread which corresponds to the internal thread of the fastening nut 35 .
  • the holding disk 45 can be displaced axially along the longitudinal axis 43 of the screw by means of the fastening nut 35 .
  • the support element 22c can be pressed onto the reinforcement layer 7 in a defined manner by a pressing force.
  • the pressing force is in particular at least as great as the deflection force or greater.
  • the contact pressure is to be designed in particular for the tensile force of the textile reinforcement.
  • the support element 22d is placed on the reinforcement layer 7 by means of leveling concrete 32, as in the previous exemplary embodiment.
  • the support element 22d is designed as a tube segment with an opening angle ⁇ , in particular sawn out of a round tube. 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 cutting, in that the main through-hole 27 and two secondary through-holes 36 are made in particular in the pipe segment.
  • the holding surface 33d is formed by the inner surface of the tube blank.
  • the holding surface 33d is uneven, in particular curved.
  • the holding disk 45d is designed in the shape of a spherical cap.
  • the surface of the retaining disk 45d facing the support element 22d is in particular curved, with the curvature of the retaining disk 45d corresponds to the curvature of the inner surface of the pipe segment of the support element 22d.
  • the support element 22d can be produced, in particular cut out, from a hollow profile with a different cross-sectional shape, in particular from a rectangular or square hollow profile.
  • the support element 22d can have been produced from flat steel, in particular by bending.
  • the retaining disk 45d can in particular be designed as a flat disk, ie without a spherical shape.
  • the flat disk has rounded outer edges, in particular on the surface facing the support element 22d. Due to the fact that the retaining disk 45d is supported with an annular surface on the support element 22d, the arrangement with the design of the retaining disk 45d as a flat disk is robust and stable. This improves the arrangement of the holding disk 45d on the support element 22d. Such an arrangement is particularly cost-effective and therefore economical to implement.
  • This arrangement is also designed to be lightweight, in particular, since - in contrast to the 24 embodiment shown - between the retaining disc 45d and the support element 22d results in a cavity.
  • the support element 22e has a tube segment which, according to the exemplary embodiment shown, includes an opening angle ⁇ of 90°.
  • a steel sheet 47 is integrally connected to the tube segment 46 and is welded to one another in the transition area.
  • Two stiffening slats 48 are provided to stiffen the support element 22e.
  • the stiffening slats 48 are arranged parallel to one another and perpendicularly to the steel sheet 47 and are welded to the steel sheet 47 and the pipe segment 46 .
  • the main through hole 27 is arranged between the two stiffening lamellae 48 .
  • the auxiliary through bores 36 are arranged on respective opposite outer sides of the stiffening lamellae 48 .
  • the main through hole 27 and the sub through hole 36 are arranged in the steel sheet 47 .
  • the support element 22e with the pipe segment 46 is arranged in the transition area 30 between the first surface section 16 and the second surface section 17 of the existing structure 2 .
  • the flat sheet steel 47 is arranged parallel to the first surface section 16 on the existing structure 2 .
  • the anchoring element 8 is anchored in the existing structure 2 with an angle of inclination n of 90°.
  • the existing structure 2 is designed here with a portal section 49 .
  • the portal section 49 has two vertical supports 50 and a horizontal connecting section 51 which connects the two vertical supports 50 to one another.
  • the support element 22f is designed in such a way that it extends over the entire width B between the vertical supports 50 and the respective reinforcement layers 7 attached thereto.
  • the support element 22f is designed as a high-hanging beam.
  • the support element 22f has a T-beam arranged centrally between two tube segments 46 .
  • the top of the T serves as a flat sheet of steel for laying against the reinforcing layer 7.
  • the main through holes 27 are arranged on the top of the T.
  • the foot of the T extends perpendicularly away from the reinforcement layer 7 and the foot 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 tube segments 46 essentially correspond to those of the previous exemplary embodiment. How in particular 29 can be seen, the main through holes 27 are designed as elongated holes. As a result, variable fine positioning of the support element 22f on the existing building 2 is possible. The assembly of the high-hanging beam is simplified.
  • the main difference, in particular compared to the sixth embodiment according to 22 is that the support element 22g is made of a round rod.
  • the round rod is divided longitudinally into two semi-circular profiles and then the main through hole 27 is inserted centrally.
  • the production of the supporting element 22g is uncomplicated and possible in particular 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.
  • the reinforcement layer 11 is not anchored directly to the anchoring element.
  • the support element 22h has an angle profile 52 .
  • a transverse strut 53 is fastened, in particular welded, between the two limbs of the angle profile 52 which are oriented essentially perpendicularly to one another.
  • the angle of inclination n for the main through hole 27 is determined by the angle of inclination of the cross brace 53 relative to the legs of the angle profile 52 .
  • the main through hole 27 extends both by the cross brace 53 and by the leg of the angle profile 52 forming the first contact surface 23.
  • a cylindrical mandrel 54 is fastened in an opening on the leg of the angle profile 52 forming the second contact surface 24 .
  • the cylindrical mandrel extends essentially perpendicularly from the second leg of the angle profile 52.
  • a deflection roller 55 with a through hole 56 can be placed on the mandrel 54.
  • the deflection roller 55 serves to deflect the reinforcement layer 11.
  • the deflection roller 55 is a deflection element.
  • the reinforcement layer 11 is held on the angle profile 52 via the deflection roller 55 and the mandrel 54 .
  • the angle profile 52 is anchored in the existing building by means of the anchoring element 8c.
  • the probationary position 11 is anchored indirectly to the existing structure 2 by the anchoring element 8c.
  • the outer radius of the deflection element is selected in such a way that the transverse pressure can be absorbed by the selected reinforcement materials. 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.
  • the existing structure 2 is first cleaned with high-pressure water jets and the support element 22h is anchored to the existing structure by means of the anchoring element 8c, then a first binder layer 9 with the reinforcing textile 10 is attached to the existing structure 2 and applied.
  • a reinforcement layer 11 is then hung on the deflection roller 55 and the deflection roller 55 is placed on the mandrel 54 .
  • the reinforcement layer 11 is embedded in the reinforcement layer 7 by means of a further binder layer 9 .
  • additional reinforcement layers 11 can be slid onto the mandrel in the same way and, in particular, secured against unintentional loosening by means of a safety pin 57 .
  • the reinforcement device 5i has a retaining plate 58 which is connected to the support element 22i by means of connecting screws 59 .
  • the holding plate 58 has in particular a rough and/or profiled surface which faces the first surface section 16 of the existing structure 2 .
  • the reinforcement layer 7 is designed with three binding agent layers 9 and two reinforcement layers 11 arranged in between.
  • the support element 22i is designed essentially as a flat disk, which is arranged inclined at an angle of inclination n of 90° with respect to the first surface section 16 .
  • the exemplary embodiment shown has the particular advantage that the support element 22i can be produced from flat steel components.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • Mechanical Engineering (AREA)
  • Working Measures On Existing Buildindgs (AREA)

Claims (10)

  1. Agencement de renfort comprenant une structure existante (2) et un dispositif de renfort (5b ; 5c ; 5d) monté sur celle-ci, comprenant
    a. une couche de renfort (7) appliquée sur une surface extérieure (6) de la structure existante (2),
    b. au moins un élément d'ancrage (8 ; 8c) avec lequel la couche de renfort (7) est ancrée à la structure existante (2),
    c. au moins un élément de support (22 ; 22c ; 22di) qui supporte la couche de renfort (7) sur la structure existante (2) et qui présente un trou traversant principal (27) à travers lequel l'élément d'ancrage (8, 8c) est passé, une surface extérieure (6) de la structure existante (2) présentant une première section de surface (16) et une deuxième section de surface (17) qui sont orientées transversalement l'une par rapport à l'autre,
    une zone de transition (30) étant disposée entre la première section de surface (16) et la deuxième section de surface (17),
    caractérisé en ce que
    d. la couche de renfort (7) présente au moins une couche de liant (9) avec une armature textile (10) et une couche d'armature (11) souple qui est noyée dans ladite au moins une couche de liant (9),
    e. un béton de ravoirage (32) est mis en place dans la zone de transition (30) et ledit au moins un élément de support (22 ; 22c ; 22d) est inséré dans le béton de ravoirage (32),
  2. Agencement de renfort selon la revendication 1, caractérisé en ce que ledit au moins un élément de support (22 ; 22c ; 22d) présente une première surface d'appui (23) et une deuxième surface d'appui (24) qui sont en contact avec la couche de renfort (7).
  3. Agencement de renfort selon la revendication 2, caractérisé en ce que la première surface d'appui (23) et/ou la deuxième surface d'appui (24) présente une rugosité de surface définie et/ou une structure de surface.
  4. Agencement de renfort selon la revendication 2 ou 3, caractérisé en ce que la première surface d'appui (23) et/ou la deuxième surface d'appui (24) est réalisée de manière incurvée au moins par zones.
  5. Agencement de renfort selon l'une quelconque des revendications 1 à 4, caractérisé en ce que ledit au moins un élément de support (22 ; 22c ; 22d) comprend du métal, en particulier des matériaux en acier, en aluminium et/ou en fer, des fibres de carbone et/ou du béton à ultrahaute résistance.
  6. Agencement de renfort selon l'une quelconque des revendications 1 à 5, caractérisé par au moins un élément de fixation avec lequel ledit au moins un élément de support (22 ; 22c ; 22d) est fixé à la structure existante (2), ledit au moins un élément de support (22 ; 22c ; 22d) présentant en particulier un trou traversant secondaire (36) à travers lequel ledit au moins un élément de fixation est passé.
  7. Agencement de renfort selon l'une quelconque des revendications 1 à 6, caractérisé en ce que ledit au moins un élément de support (22 ; 22c ; 22d) présente une section transversale pleine ou une section transversale profilée, ledit au moins un élément de support (22 ; 22c ; 22d) présentant en particulier une forme de section transversale qui est réalisée de manière sensiblement rectangulaire, circulaire, annulaire ou cunéiforme.
  8. Agencement de renfort selon l'une quelconque des revendications précédentes, caractérisé en ce que ledit au moins un élément d'ancrage (8 ; 8d) comprend une section d'ancrage (60) par laquelle l'élément d'ancrage (8, 8d) est ancré dans la structure existante (2), et une section de retenue (AH) par laquelle l'élément de support (22 ; 22c ; 22d) est retenu.
  9. Agencement de renfort selon l'une quelconque des revendications précédentes, caractérisé en ce que, le long d'un axe longitudinal (4) de la structure existante (2), plusieurs éléments de support (22 ; 22c ; 22d) sont prévus, qui sont chacun ancrés à la structure existante (2) au moyen d'au moins un élément d'ancrage (8 ; 8c).
  10. Procédé de renforcement de la structure existante de l'agencement de renfort selon l'une quelconque des revendications précédentes, comprenant les étapes de procédé suivantes
    - mise à disposition de la structure existante (2), en particulier une poutre en béton armé,
    - application de la couche de renfort (7) sur une surface extérieure (6) de la structure existante (2),
    - ancrage de la couche de renfort (7) au moyen dudit au moins un élément d'ancrage (8 ; 8c).
EP20206236.0A 2019-11-08 2020-11-06 Agencement de renfort au moyen d'une construction existante et d'un dispositif de renfort appliqué à celle-ci ainsi que procédé de renforcement d'une construction existante Active EP3819431B8 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102019217313.6A DE102019217313A1 (de) 2019-11-08 2019-11-08 Verstärkungsvorrichtung für ein Bestandsbauwerk, Verstärkungsanordnung mit einem Bestandsbauwerk und einer daran angebrachten derartigen Verstärkungsvorrichtung sowie Verfahren zum Verstärken eines derartigen Bestandbauwerkes

Publications (3)

Publication Number Publication Date
EP3819431A1 EP3819431A1 (fr) 2021-05-12
EP3819431B1 true EP3819431B1 (fr) 2023-02-22
EP3819431B8 EP3819431B8 (fr) 2023-06-07

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EP20206236.0A Active EP3819431B8 (fr) 2019-11-08 2020-11-06 Agencement de renfort au moyen d'une construction existante et d'un dispositif de renfort appliqué à celle-ci ainsi que procédé de renforcement d'une construction existante

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DE (1) DE102019217313A1 (fr)

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DE102023206034A1 (de) 2022-06-29 2024-01-04 Cbp Guideway Systems Gmbh Anordnung und Verfahren zum nachträglichen Verstärken eines Bauteils mit mindestens einem Diskontinuitätsbereich

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Publication number Priority date Publication date Assignee Title
US6003276A (en) * 1996-06-20 1999-12-21 Regents Of The University Of California Reinforcement of cementitious walls to resist seismic forces
US7246473B2 (en) * 2004-04-07 2007-07-24 Lau David T Anchorage system for structural reinforcement of fiber reinforced plastic materials and the like
FR2918689B1 (fr) * 2007-07-09 2012-06-01 Freyssinet Procede de renforcement d'un ouvrage de construction, et ouvrage ainsi renforce.

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EP3819431A1 (fr) 2021-05-12
DE102019217313A1 (de) 2021-05-12

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