EP4206413A1 - Vorgespannte betonbauteile und verfahren zur herstellung vorgespannter betonbauteile - Google Patents

Vorgespannte betonbauteile und verfahren zur herstellung vorgespannter betonbauteile Download PDF

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Publication number
EP4206413A1
EP4206413A1 EP23158276.8A EP23158276A EP4206413A1 EP 4206413 A1 EP4206413 A1 EP 4206413A1 EP 23158276 A EP23158276 A EP 23158276A EP 4206413 A1 EP4206413 A1 EP 4206413A1
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EP
European Patent Office
Prior art keywords
fibers
concrete
holding elements
reinforcement
elements
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP23158276.8A
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German (de)
English (en)
French (fr)
Inventor
Josef Peter Kurath-Grollmann
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CPC AG
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CPC AG
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Filing date
Publication date
Application filed by CPC AG filed Critical CPC AG
Priority to EP23158276.8A priority Critical patent/EP4206413A1/de
Publication of EP4206413A1 publication Critical patent/EP4206413A1/de
Pending legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/12—Anchoring devices
    • E04C5/127—The tensile members being made of fiber reinforced plastics
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
    • E04B1/16—Structures made from masses, e.g. of concrete, cast or similarly formed in situ with or without making use of additional elements, such as permanent forms, substructures to be coated with load-bearing material
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
    • E04B5/16—Load-carrying floor structures wholly or partly cast or similarly formed in situ
    • E04B5/32—Floor structures wholly cast in situ with or without form units or reinforcements
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C2/00—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels
    • E04C2/02—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials
    • E04C2/04—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres
    • E04C2/06—Building elements of relatively thin form for the construction of parts of buildings, e.g. sheet materials, slabs, or panels characterised by specified materials of concrete or other stone-like material; of asbestos cement; of cement and other mineral fibres reinforced
    • 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
    • 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
    • E04C5/073—Discrete reinforcing elements, e.g. fibres
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04C—STRUCTURAL ELEMENTS; BUILDING MATERIALS
    • E04C5/00—Reinforcing elements, e.g. for concrete; Auxiliary elements therefor
    • E04C5/08—Members specially adapted to be used in prestressed constructions
    • E04C5/085—Tensile members made of fiber reinforced plastics
    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B2103/00—Material constitution of slabs, sheets or the like
    • E04B2103/02—Material constitution of slabs, sheets or the like of ceramics, concrete or other stone-like material

Definitions

  • the present invention relates to a method for producing a prestressed concrete component.
  • a further aspect of the invention relates to prestressed concrete components, in particular produced using the method mentioned for the production of a prestressed concrete component.
  • Prestressed concrete slabs are known from the prior art. For example disclosed US 2002/0059768 A1 a method for producing a prestressed concrete slab using tensioned wire ropes. To generate the tension, the wire ropes are wound around opposite bolts and then tensioned by moving the bolts apart. This results in a pre-tension of approx. 70% of the breaking strength of the wire rope.
  • the object of the present invention is, inter alia, to specify an improved method for the production of prestressed concrete components.
  • Another object of the present invention is to provide an improved prestressed concrete structure. This object is achieved by a concrete component according to claim 15.
  • a partial aspect of the invention relates to a reinforcement element for the production of prestressed concrete components, with a large number of fibers and several holding elements which are connected to one another by the fibers so that the fibers can be tensioned in their longitudinal direction by means of the holding elements.
  • the fibers are fastened to the holding elements in such a way that, in the tensioned state, the fibers open out largely in a straight line into the holding elements. This achieves both high prestressing and efficient, reliable and therefore cost-effective production of the concrete components.
  • fiber includes a single or several elongated and flexible reinforcement elements for concrete components, for example a single filament - also called single filament or monofilament - or a bundle of filaments - also called multifilament, multifilament yarn, yarn or - in the case of stretched filaments - roving.
  • the term fiber also includes a single wire or multiple wires.
  • the fibers can also be coated individually or together and/or the fiber bundle can be stranded or twisted.
  • the net cross-sectional area of the fibers is less than about 5 mm 2 , and specifically ranges from about 0.1 mm 2 to about 1 mm 2 .
  • the tensile elongation of the fibers is greater than about 1%.
  • the tensile strength of the fibers, based on their net cross-sectional area is greater than approximately 1000 N/mm 2 , in particular greater than approximately 1800 N/mm 2 .
  • the reinforcement elements are first laid in a mold and then the fibers are stretched by pulling the corresponding holding elements apart.
  • the concrete component is then cast, with the parts of the fibers lying inside the mold being embedded in concrete.
  • the tension previously applied to the fibers is released, with the tension in the cast-in parts of the fibers being maintained, since the cast-in fiber parts are frictionally connected to the concrete and there is practically no relative displacement between these fiber parts and the concrete.
  • the non-positive connection is based - among other things - on the wedging of the fibers in their concrete coating (Hoyer effect).
  • the stress-free parts of the fibers protruding from the concrete component can be separated and removed together with the holding elements. In the case of the prestressed concrete component, the prestress is therefore generated by the tension of the fibers embedded in concrete.
  • connection between fibers and concrete can be strengthened by a variety of means, for example by increasing the surface roughness of the fibres.
  • this connection is designed in such a way that the full dimensioning tensile force can be transmitted via the mechanical shear connection after 200 mm, in particular after 100 mm, further after in particular 70 mm, binding length (i.e. length of the fibers embedded in concrete).
  • the fibers of the reinforcement element can be made from a variety of different materials, in particular from non-corrosive material and more particularly from alkali-resistant material.
  • this material is a polymer like carbon, but also glass, steel or natural fibers.
  • the fibers are made of carbon.
  • Carbon fibers have the advantage that they are very durable, which means that there is no noticeable loss of strength even over decades.
  • carbon fibers are corrosion-resistant, in particular they do not corrode on the surface of the concrete components, and are practically invisible. This means that the carbon fibers can often be left on the surface of the concrete components. However, they can also be removed with ease, for example by breaking them off or simply stripping them off.
  • Fastening the fibers “in” the holding elements includes a wide variety of fastening options, in particular also fastening the fibers “to” or “on” the holding elements, for example laminating the fibers without further covering.
  • both a high prestressing of the concrete components and an efficient, reliable and simple handling of the reinforcing elements are achieved.
  • the concrete components can be produced particularly inexpensively.
  • the following is achieved: Due to the fact that the fibers flow in a largely straight line with respect to their longitudinal direction, ie the fibers continue to flow evenly into the holding elements, transverse stresses in the fibers are largely avoided. Such transverse stresses often lead to fiber breaks and occur, for example, at kinks, jams or tight curve radii, i.e. typically with deflection webs, deflection rollers or guide bolts.
  • the fibers can be stressed at a stress of from about 50% to about 95% of the breaking stress of the fibers.
  • the fibers can be stressed with at least about 80%, more preferably at least about 90%, of the breaking stress of the fibers.
  • the thickness of the concrete component to be produced is in the range from approx. 10 mm to 60 mm, in particular approx. 15 mm to 40 mm.
  • the surface area of the concrete component is at least approximately 10 m ⁇ 5 m, in particular at least approximately 10 m ⁇ 10 m, more particularly at least approximately 15 m ⁇ 15 m.
  • the length of the concrete component is at least approx. 6 m, more particularly at least approx. 12 m.
  • the reinforcing elements can be produced as intermediate products at a first location, optionally packed in appropriate transport containers and transported to another location for the production of the concrete parts become. At the other location, for example in a concrete production plant, the reinforcement elements that have been delivered are then directly available as prefabricated components.
  • the fibers are individual fibers and/or comprise one or more rovings, in particular carbon rovings.
  • Individual fibers are to be understood as meaning individual fibers that are not directly connected.
  • a continuous fiber assembly is seen where the reciprocating portions of the fiber assembly are connected via loops.
  • roving means a bundle of stretched filaments.
  • a roving also referred to as a stretched yarn, typically comprises a few thousand filaments, in particular approximately 2,000 to approximately 16,000 filaments. Due to the roving, the tensile forces acting on the fibers are distributed largely evenly over a large number of filaments, so that local peak loads are largely avoided.
  • the filaments of the roving have a small fiber diameter, so that a correspondingly large surface-to-diameter ratio and thus a good bond between the concrete and the filaments is achieved. Furthermore, a good shear transmission and a good distribution of the tensile load on the concrete are achieved.
  • the fibers are produced from an arrangement of several rovings, which comprises 2 to 10, in particular 2 to 5, individual rovings.
  • these fibers have about 4,000 to about 160,0000 filaments.
  • the holding elements have guide elements for the fibers, in particular a clamping device and/or a carrier for laminating the fibers in the end area, in particular a fiber-reinforced polymer matrix, more particularly a polyester matrix. Good power transmission is achieved by these guide elements. In addition, a particularly space-saving and robust unit is achieved through the lamination.
  • the holding elements can also be designed as double-sided adhesive tape.
  • the fibers in the holding elements form an essentially planar layer and are arranged, in particular, largely parallel and/or largely evenly spaced from one another.
  • the reinforcing element has the form of a web or a harp up. This form is easily stacked or rolled up, optionally using interleaving sheets to keep the respective fibers separate. This means that reinforcement elements are easy to transport.
  • Such a harp-shaped reinforcement element has the advantage over a lattice (grid) that no knotting occurs and thus very high tensile loads can be achieved.
  • lattice grid
  • the reinforcement element has additional spacers which connect the fibers to one another, for example in the form of transverse threads and/or a fabric, so that there is a distance between the individual fibers even when the reinforcement element is not tensioned or is only partially tensioned. This largely or completely prevents the slack fibers from becoming tangled.
  • These spacers thus serve as an assembly aid and/or transport aid. When concreted in, the spacers absorb practically no tensile loads.
  • the distance between the reinforcements is approximately 5 mm to approximately 40 mm, in particular approximately 8 mm to approximately 25 mm, and/or at least 10, in particular at least 40, fibers are fastened in each of the holding elements.
  • the reinforcement distance ie the distance between two adjacent fibers, is less than or equal to twice the thickness of the concrete component.
  • the fibers are impregnated with an alkali-resistant polymer, in particular with a resin, more particularly with a vinyl ester resin. This increases the tensile strength of the fibers.
  • the fibers are coated with a granular material, in particular with sand. This improves the bond between the fibers and the concrete and thus increases the resistance of the prestressing in the concrete component.
  • the fibers are attached to the holding elements in such a way that, in the tensioned state, the fibers continue largely in a straight line in the holding elements, in particular over a distance of at least approx. 5 mm, more particularly at least approx. 10 mm. This achieves good power transmission between the fibers and the holding elements.
  • the holding elements have a force distribution means, in particular running transversely to the direction of the fibers, in particular a curvature and/or a profile. This achieves good distribution of the acting forces and thus high tensile stress and/or low stress on the fibers during tensioning. In addition, this shortens the binding length, that is, shortens the length required for reliable attachment of the fibers to the holding elements.
  • the curvature of the holding element is designed in such a way that the curved fibers each define planes that are arranged largely parallel, in particular perpendicular to the position of the fibers. If the fibers are arranged in a horizontal position, their fiber ends are curved vertically downwards or upwards, for example.
  • the profiling achieves a good non-positive connection between the holding element and the clamping device.
  • the pressure on the holding element and/or on the fibers can thus be reduced.
  • the profiling is arranged on at least one of those surfaces of the holding element which is provided for fastening the holding element in a clamping device.
  • the profiling is wavy or jagged, in particular sawtooth-shaped.
  • its width is greater than 0.4 m, in particular greater than 0.8 m, and/or its length is greater than 4 m, in particular greater than 12 m. This achieves efficient production of large concrete components. For example, a 20 m ⁇ 20 m concrete slab can be produced in one work cycle.
  • the holding element is severed after being connected to the fibers, in particular in the middle, so that the two sections produced in turn form two holding elements for two reinforcing elements produced in succession.
  • the first section forms the end of a first reinforcement element and the second section forms the beginning of the subsequent reinforcement element.
  • the holding element is designed as a double holding element, with an open intermediate area between the two parts of the double holding element in which the fibers are exposed.
  • the previously mentioned severing of the holding element can be done by simply severing the fibers in this intermediate area, for example by breaking.
  • efficient separation is achieved during production, in particular in series production, of the reinforcement elements.
  • the retaining element is fastened while the fibers are being pulled out together, in particular by moving the retaining element in synchronism with the movement of the fibers.
  • the Retaining element by attaching a top and a bottom part of the retaining element from opposite sides of the fibres, in particular by assembling glass fiber mats.
  • the fibers are arranged by placing the fibers on a first part of the holding element and fixing the fibers by adding a second part of the holding element and by pressing these two parts together. As a result, the fibers are firmly enclosed by the holding elements, so that a particularly strong and robust attachment is achieved.
  • the present invention also relates to a prestressed concrete component, in particular a concrete slab, which was produced using at least one reinforcement element, the prestressing of the concrete component being at least 80%, in particular at least 90%, of the breaking stress of the fibers.
  • this concrete component is produced using a large number of reinforcing elements according to the invention, in particular arranged in groups. Due to the arrangement in groups, an improved adaptation to the conditions of the concrete component is achieved.
  • a grouping can consist of one or more horizontal and/or vertical distances or by an angular, in particular right-angled, arrangement.
  • the fibers are pretensioned by tensioning in sections, in particular individually for each of the reinforcement elements used.
  • the preload can be flexibly adjusted to specific requirements.
  • the reinforcement distance i.e. the distance between two adjacent fibers, is less than or equal to twice the thickness of the concrete component, in particular less than or equal to twice the thickness of the plate.
  • the method according to the invention is particularly suitable for the production of large prestressed concrete components, for example for concrete slabs approximately 20 m wide and approximately 20 m long.
  • these large prestressed concrete components can then be subdivided into smaller prestressed concrete components, since the prestressing of the concrete components is always maintained during division.
  • the smaller concrete components can then be individually cut to size, for example by sawing, CNC milling or water jet cutting, in order to produce, for example, specially shaped floor panels, stair treads or panels for table tennis tables.
  • such a subdivision can be achieved by using separating elements, in particular a foam.
  • the at least one reinforcement element is provided by arranging several of the reinforcement elements in one layer, in particular by placing them largely parallel and/or adjacent to one another. This means that large areas can be set up efficiently.
  • the at least one reinforcement element is provided by arranging the reinforcement elements in at least two layers, with the reinforcement elements in adjacent layers being aligned at an angle, in particular largely at right angles. This achieves an efficient and flexible set-up of a complex reinforcement.
  • the at least one reinforcement element is provided by stacking several of the reinforcement elements on top of one another.
  • this additionally includes the step of introducing a separating element, in particular a foam, before the concrete component is cast in concrete.
  • a separating element in particular a foam
  • a foam offers a very flexible, easy to use and inexpensive partition.
  • the foam offers an aid for positioning the fibers and/or fixing the fibers during concreting.
  • a solid material can also be used as a separating element, for example rubber or styrofoam.
  • this also includes the step of separating the concrete component after concreting, in particular by breaking and/or sawing. Since the foam does not make a significant contribution to the strength, the individual subdivisions of the concrete component are practically only held together by the fibers. The concrete components can thus be easily separated, in particular by simply breaking them. This achieves a breakdown into manageable parts in a convenient and very efficient way. For example, these parts can be distributed from a production plant for concrete components to other work stations and brought into the final form there.
  • Reinforcement element for the production of prestressed concrete components with a large number of fibers and several Holding elements, which are connected to one another by the fibers, so that the fibers can be tensioned in their longitudinal direction by means of the holding elements, wherein the fibers are fastened to the holding elements in such a way that, in the tensioned state, the fibers open out into the holding elements in a largely straight line.
  • Reinforcing element according to the 1st embodiment variant wherein the fibers are individual fibers and/or comprise one or more rovings, in particular carbon rovings.
  • Reinforcing element (10) according to the 1st embodiment variant or the 2nd embodiment variant, the holding elements having guide elements for the fibers, in particular a clamping device and/or a carrier for laminating the fibers in the end region, in particular a fiber-reinforced polymer matrix, more particularly a polyester -Matrix.
  • Reinforcement element according to one of the preceding embodiment variants, wherein the fibers in the holding elements form an essentially flat layer and are arranged in particular largely parallel and/or largely evenly spaced from one another.
  • Reinforcement element according to one of the preceding embodiment variants, wherein the distance between the reinforcements is approx. 5 mm to approx. 40 mm, in particular approx. 8 mm to approx. 25 mm, and/or at least 10, in particular at least 40 fibers are fastened in each of the holding elements.
  • Reinforcement element according to one of the preceding embodiment variants, wherein the holding elements have a force distribution means, in particular running transversely to the direction of the fibers, in particular a curvature and/or a profile.
  • Reinforcement element according to one of the preceding variants, the width of which is greater than 0.4 m, in particular greater than 0.8 m, and/or whose length is greater than 4 m, in particular greater than 12 m.
  • Concrete component in particular concrete slab, produced using at least one reinforcement element according to one of the variants 1 to 8, the prestressing of the concrete component being at least 80%, in particular at least 90%, of the breaking stress of the fibers.
  • the at least one reinforcement element is provided by arranging a plurality of the reinforcement elements in one layer, in particular by placing them largely parallel and/or adjacent to one another.
  • the at least one reinforcement element is provided by arranging the reinforcement elements in at least two layers, the reinforcement elements in adjacent layers being aligned at an angle, in particular largely at right angles.
  • FIG. 1 shows a simplified schematic representation of an embodiment of a reinforcing element 10 in the stretched state.
  • a reinforcement element 10 is used to produce prestressed concrete components.
  • the reinforcement element 10 comprises ten individual fibers, which in this example are designed as carbon fibers 12 (only partially designated), and two holding elements in the form of two carriers 14.
  • the carriers 14 are arranged at a distance from one another and are supported by the ten carbon fibers 12 connected with each other.
  • the carbon fibers 12 can be tensioned in their longitudinal direction T by pulling the carriers 14 apart.
  • the carbon fibers 12 are fastened in the supports 14 in such a way that the stretched carbon fibers 12 open into the supports 14 in a straight line. Furthermore, the carbon fibers 12 form an essentially planar layer, in which the carbon fibers 12 are arranged largely parallel and at a largely even distance from one another. As a result, the reinforcement element 10 has the shape of a harp. In this For example, the distance between the reinforcements, ie the distance between the carbon fibers 12 arranged in parallel, is approximately 10 mm and the width of the reinforcement element 10 is therefore approximately 10 cm.
  • Each of the carbon fibers 12 comprises a carbon roving, ie a bundle of a few thousand stretched filaments arranged next to one another and essentially aligned in the same way (approx. 2,000 to approx. 16,000 filaments). These filaments and thus also the carbon fibers 12 are impregnated with an alkali-resistant resin in the form of vinyl ester resin, so that the carbon fibers 12 form a compact unit, similar to a metal wire. The impregnation can take place, for example, by means of an immersion bath, through which the roving for producing the carbon fibers 12 is pulled.
  • the carbon fibers 12 are coated with sand, so that an improved connection between fibers and concrete is achieved.
  • the full dimensioning tensile force can be transmitted via the mechanical shear connection.
  • the carriers 14 each have two openings 16 (shown in dashed lines) by means of which the carriers 14 can be positioned on a clamping device (not shown). With the clamping device, the carbon fibers can 12 are precisely aligned during the production of the concrete components, in particular without horizontal and / or vertical canting, tensioned.
  • the carrier 14 has a hole or a multiplicity of holes, in particular more than two holes, for positioning the carrier 14 .
  • carrier 14 is manufactured using inexpensive materials.
  • An exemplary material composition and the corresponding production of the carrier 14 is based on 2 described.
  • Other materials can also be used since the beam 14 is not part of the concrete component to be produced and is usually separated and removed after concreting.
  • FIG 2 shows a simplified schematic detail view of a carrier 14 according to FIG 1 .
  • the carrier 14, also referred to as a patch, comprises a fiber-reinforced polymer matrix in the form of a polyester matrix with fibers enclosed therein in the form of two glass fiber mats.
  • This polyester matrix encloses the stretched carbon fibers 12 in their end areas.
  • the size of this polyester matrix is about 10 cm x 10 cm and the total thickness is about 2 mm.
  • the length of the polyester matrix in the direction of the carbon fibers 12 is between approximately 10 cm and approximately 20 cm.
  • the fiber mats form a lower one and an upper layer, wherein the stretched carbon fibers 12 are sandwiched between these layers and fixed therein by lamination with polyester.
  • the polyester matrix therefore forms a rectilinear guide element for the carbon fibers 12 (indicated by dashed lines), with the carbon fibers 12 continuing largely rectilinearly within the polyester matrix, ie within the carrier 14 .
  • the carbon fibers 12 are fixed in their mutual arrangement by means of the carrier 14, namely in a flat position, largely parallel and spaced evenly apart from one another.
  • the ends of the carbon fibers 12 protrude a little beyond the supports 14 on the exit side of the supports 14 .
  • the fibers 12 can also end in the carrier 14 or flush on its surface, for example if the carrier 14 has been separated from a larger unit.
  • FIG. 12 shows a simplified schematic representation of an intermediate stage in the manufacture of a prestressed concrete slab 20, for example in a prefabricated concrete slab plant.
  • the intermediate state corresponds to an arrangement after the preparatory work has been completed, but before the concrete slab 20 is poured.
  • the arrangement comprises a concreting table (not shown), a hollow frame 30 arranged thereon and a large number of identical reinforcing elements 10 according to the invention (in some cases only indicated schematically).
  • the hollow frame 30 forms together with the surface of the concreting table forms a mold for the concrete, also known as a prestressing bed.
  • the reinforcement elements 10 each have a large number of carbon fibers 12 (for the sake of clarity, only the outer fibers are shown in some cases) and two carriers 14 and largely correspond in their structure to the reinforcement elements 10 according to FIG 1 .
  • the length of the carbon fibers 12 is approximately 20 m and the width of the carrier 14 is approximately 1 m.
  • the distance between the reinforcements corresponds to the previous example, ie as in FIG 1 approx. 10 mm, so that approx. 100 carbon fibers 12 are fastened to the carriers 14 in each case.
  • the carriers 14 are each pulled apart, so that the carbon fibers 12 are in the hollow frame 30 in the stretched state.
  • the carbon fibers 12 are guided outwards through the hollow frame 30, so that the ends of the carbon fibers 12 and the supports 14 are outside of the hollow frame 30, for example at a distance of 30 cm from the hollow frame 30.
  • the passage channels are also formed by corresponding gaps between the lower part and the upper part of the hollow frame 30 .
  • the hollow frame 30 is constructed from a plurality of slats lying one above the other, so that the carbon fibers 12 can be guided through the interstices of the individual slats.
  • the gaps can also be sealed with foam rubber and/or brush hairs be.
  • the height of the superimposed bars is 3mm, 12mm and 3mm.
  • the first half of the reinforcing elements 10 are in a first layer, parallel and adjacent to each other and the second half of the reinforcing elements 10 are in a second layer, also parallel and adjacent to but perpendicular to the reinforcing elements 10 of the first layer.
  • the reinforcing elements 10 are thus stacked in separate layers and aligned at right angles to one another in the two adjacent layers.
  • the reinforcement elements 10 therefore form both a longitudinal reinforcement and a transverse reinforcement, but without individual interweaving of the individual carbon fibers 12.
  • the carriers 14 are pulled apart, for example with a clamping device, also called a prestressing system, or manually with a torque wrench (not shown).
  • a tension of at least approx. 30 kN/m or at least approx. 300 kN/m is generated, depending on the load requirements on the concrete slab (dimensioning force).
  • concrete can be poured into the hollow frame 30 prepared in this way in order to concrete the concrete slab 20 in one operation.
  • the parts of the tensioned carbon fibers 12 which are located in the hollow frame 30 are enclosed by the concrete and thus embedded in concrete.
  • SCC fine concrete at least C30/37 according to the SIA SN505 262 standard
  • the concrete can also be introduced into the hollow frame 30 by spraying or spatula and evenly distributed by vibration.
  • the concrete slab 20 can be removed from the hollow frame 30 .
  • the carbon fibers 12 embedded in concrete form the static reinforcement of the concrete slab 20.
  • the parts of the carbon fibers 12 protruding from the concrete are broken off at the edges of the concrete slab 20 and removed together with the supports 14.
  • the concrete slab produced is approximately 6 mx 2.5 m in size and the reinforcement content of this concrete slab 20 is more than 20 mm 2 /m width. In another example, the concrete slab produced is about 7 mx about 2.3 m.
  • FIG 4 14 shows a simplified schematic side view of a carrier 14 according to FIG 2 .
  • the carbon fibers 12 flow straight into the carrier 14. Furthermore, the carbon fibers 12 continue in a straight line inside the carrier 14, so that the carrier 14 forms a straight guide for the carbon fibers 12.
  • the length of the carrier 14 in the direction of the carbon fibers 12 is approximately 3 cm.
  • the carrier 14 can additionally have a profile 16 (shown in dashed lines).
  • a serrated profile 16 is arranged on a first (upper) surface and on the opposite (lower) surface of the carrier 14 . These surfaces are provided for mounting the carrier 14 in a fixture (not shown), for example by clamping.
  • the jagged profiling 16 achieves a non-positive connection between the carrier 14 and the clamping device in the form of teeth.
  • FIG. 5 shows a representation according to 3
  • a subdivision is also made in that a construction foam 40 (shown as a wavy line) is foamed as a separating element both on the bottom of the hollow mold and under and over the carbon fibers 12.
  • This subdivision means that no or only a negligible amount of the poured concrete can penetrate into the space occupied by the subdivision.
  • the construction foam 40 offers a fixation of the fibers during concreting.
  • the concrete slab 20 can be broken into individual raw slabs along the construction foam subdivisions. These raw panels can then continue processed, for example by cutting the raw panels into the desired shape with a circular saw.
  • the concrete slab produced is approx. 20 m x approx. 20 m and its thickness is approx. 20 mm.
  • 24 smaller slabs with a size of approx. 5 m x approx. 3 m result.
  • 3 table tennis tables each can then be sawn from these smaller slabs.
  • FIG 6 14 shows a simplified schematic side view of a carrier 14 according to FIG 2 , but this has a means for force distribution in the form of a bend 18.
  • the carbon fibers 12 flow straight into the carrier 14 and then run inside the carrier 14, corresponding to the curvature 18 of the carrier 14, also with a curvature.
  • the carbon fibers 12 are fastened in the entry area of the carrier 14 in such a way that the carbon fibers 12 continue largely in a straight line into the carrier 14 over a distance d of 10 mm. This shape achieves both good introduction of the fibers into the carrier 14 and an even distribution of the forces to be absorbed.

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  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Manufacturing Of Tubular Articles Or Embedded Moulded Articles (AREA)
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EP23158276.8A 2012-09-17 2012-09-17 Vorgespannte betonbauteile und verfahren zur herstellung vorgespannter betonbauteile Pending EP4206413A1 (de)

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EP23158276.8A EP4206413A1 (de) 2012-09-17 2012-09-17 Vorgespannte betonbauteile und verfahren zur herstellung vorgespannter betonbauteile
EP12766940.6A EP2912239B1 (de) 2012-09-17 2012-09-17 Armierungselement zur herstellung vorgespannter betonbauteile, betonbauteil und herstellverfahren
PCT/EP2012/068237 WO2014040653A1 (de) 2012-09-17 2012-09-17 Armierungselement zur herstellung vorgespannter betonbauteile, betonbauteil und herstellverfahren

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CN (2) CN109281439A (pl)
AU (1) AU2012389581B2 (pl)
CA (1) CA2884137C (pl)
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DE102016211176B4 (de) * 2016-06-22 2019-12-24 Lenz Tankred Verfahren und Verwendung einer Vorrichtung zur Durchführung des Verfahrens zur Herstellung von Betonbauteilen
EP3418465B1 (de) 2017-06-23 2022-05-04 Solidian GmbH Verfahren zur herstellung eines textilbewehrten baustoff-bauteils und verwendung einer spannvorrichtung hierfür
KR101980324B1 (ko) * 2017-11-13 2019-05-20 공주대학교 산학협력단 섬유 강화 플라스틱 및 그 제조 방법
IT201800005076A1 (it) 2018-05-04 2019-11-04 Sistema di precompressione di una struttura
JP6602928B1 (ja) * 2018-05-23 2019-11-06 株式会社スカイ・アーク コンクリート構造物の切除方法
US11186991B2 (en) * 2018-10-31 2021-11-30 Shenzhen University Early warning device and ductility control method for prestressed FRP reinforced structure
CN111189768B (zh) * 2018-11-14 2023-03-10 青岛理工大学 一种腐蚀驱动智能纤维及其制备方法和应用
CN114599843A (zh) 2019-09-06 2022-06-07 Cpc公司 混凝土顶板、混凝土顶板件和制造混凝土顶板和混凝土顶板件的方法
EP3845354A3 (de) 2019-12-10 2021-09-15 Wobben Properties GmbH Verfahren zum herstellen von segmenten für einen turm, vorgespanntes segment, turmring, turm, windenergieanlage sowie vorspannvorrichtung
CN111691679B (zh) * 2020-06-24 2021-11-12 北京工业大学 基于数字孪生的预应力钢结构智能张拉方法
KR102226759B1 (ko) * 2020-08-04 2021-03-12 한국건설기술연구원 매립 스트랜드에 긴장력을 도입한 프리캐스트 프리스트레스트 콘크리트 패널의 제작 방법
EP4349554A1 (de) 2022-10-04 2024-04-10 Holcim Technology Ltd Verfahren zur herstellung einer betonplatte aus vorgespanntem beton
EP4357092A1 (de) 2022-10-17 2024-04-24 Holcim Technology Ltd Verfahren und vorrichtungzur herstellung einer betonplatte aus vorgespanntem beton

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HUE062126T2 (hu) 2023-09-28
FI2912239T3 (fi) 2023-06-02
EP2912239A1 (de) 2015-09-02
US20150267408A1 (en) 2015-09-24
CN104797764A (zh) 2015-07-22
CA2884137C (en) 2019-04-30
AU2012389581B2 (en) 2017-09-28
EP2912239B1 (de) 2023-03-15
ES2942845T3 (es) 2023-06-07
US20180179757A1 (en) 2018-06-28
AU2012389581A1 (en) 2015-03-19
PT2912239T (pt) 2023-05-09
US11365544B2 (en) 2022-06-21
WO2014040653A1 (de) 2014-03-20
JP6198832B2 (ja) 2017-09-20
JP2015534613A (ja) 2015-12-03
CN109281439A (zh) 2019-01-29
DK2912239T3 (da) 2023-06-19
AU2012389581A8 (en) 2015-04-02
US9938721B2 (en) 2018-04-10
PL2912239T3 (pl) 2023-08-14
CA2884137A1 (en) 2014-03-20
KR20150082216A (ko) 2015-07-15
RU2015114179A (ru) 2016-11-10

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