Reinforcing component for concrete reinforcement as well as concrete component

Abstract

Reinforcing component (01) for concrete reinforcement comprising: - a proximal rod section (03) which extends along a central axis (02); - two opposing distal anchoring sections (04) which are integrally formed on the axially opposite ends of the rod section (03), wherein each anchoring section (04) has at least two legs (06) oriented at an angle to each other, which extend outwards from the central axis (02); wherein the rod section (01) and the anchoring sections (04) are formed in one piece from plastic, characterized in that each leg (06) has at least one raised area (07) and one recessed area (08) on its surface facing the other leg (06) of the same anchoring section (04).

Description

[0001] The present invention relates to a reinforcing component for concrete reinforcement and a reinforced concrete component. The reinforcing component has at least two opposing distal anchoring sections, each arranged at one end of a bar section. The anchoring sections have at least two legs arranged at an angle to each other.

[0002] In general, concrete exhibits good compressive strength, durability, and hardness, while its tensile strength, flexural strength, and energy absorption capacity are low. To improve tensile strength and expand its application range under dynamic loads, reinforcements are incorporated into concrete components. Examples of such reinforcements include steel mesh, fiber reinforcements, or even plastic components. The fabrication and arrangement of steel reinforcements require not only precise positioning of the steel components but also complex assembly. The addition of plastic or steel fibers is also a known alternative to wire mesh, primarily reducing shrinkage cracking and increasing the impact resistance of the finished concrete components.

[0003] Macrosynthetic fibers used for reinforcing concrete are known from WO 2017 / 147199 A1. The fiber has an approximately 90° bend at both ends. The use of these macrosynthetic fibers can reduce deflection of the hardened concrete caused by loads. However, the problem is that if certain material stresses are exceeded, the bond between the concrete and the steel fiber can break.

[0004] WO 01 / 55046 A2 discloses a reinforcing element for composite materials. The reinforcing element consists of a longitudinally extending body with a first end section and a second end section. The end sections are angled relative to the body. The reinforcing element can impart electrical, magnetic, or chemical properties to the composite material.

[0005] In the textbook "Fiber-Reinforced Concrete" by Bernhard Wietek, 3rd edition, Wiesbaden: Springer Fachmedien Wiesbaden GmbH, 2020; pp. 47-58, fibers used in concrete processing are described. These fibers can be synthetic, e.g., made of plastic or steel, or natural, such as plant or animal fibers. Furthermore, possible shapes of steel fibers are described. Common steel fiber shapes are the hook shape, the wave shape, and the compressed shape.

[0006] WO 99 / 36640 A1 describes fiber additives for use in concrete, comprising a variety of thermoplastic fibers. The fibers have a sinusoidal profile geometry along their entire length. They consist of materials from the group including polyolefins, polyesters, polyvinyl chloride, polyamides, and similar materials.

[0007] WO 97 / 43502 A1 describes a fiber for use in concrete, which has an elongated body and end pieces arranged at its ends. Each end piece has a central slit, creating a diamond-shaped open profile.

[0008] WO 2015 / 013744 A1 discloses a composite structural material formed from a particle-shaped aggregate comprising at least three radial legs extending outwards from a central hub. The number of legs varies between 3 and 10. The legs are cylindrical, conical, or frustoconical in shape.

[0009] Reinforcing pieces for mixing with a concrete composite are known from WO 2017 / 214662 A1. The reinforcing pieces comprise at least one hook-shaped or curved formation. The reinforcing piece, made of plastic, has two hooks, each located at one end of the piece. Furthermore, the reinforcing piece can be designed in various symbolic shapes.

[0010] US Patent 10,414,691 B2 describes curved steel fibers for reinforcing a cement-based material. The curved steel fiber has a curved main body with a radius of curvature R and curved ends, each formed integrally at opposite ends of the main body. The steel fibers are mixed into the concrete and are intended to be statistically uniformly distributed. One problem is the high weight of the steel fibers, which can lead to uneven fiber distribution, especially in concrete mixes with lower density. Another problem is that exceeding certain material stresses can cause the bond between the concrete and the steel fiber to break, resulting in a loss of tensile strength.

[0011] The object of the present invention, therefore, is to provide an improved reinforcement component for reinforcing concrete, which can withstand high tensile stresses over a large area without separation occurring between the concrete material and the reinforcement. A further object is to provide a concrete component with improved reinforcement.

[0012] This problem is solved by a reinforcement component for concrete reinforcement according to the attached claim 1 or by a concrete component according to claim 8.

[0013] The reinforcing component according to the invention for concrete reinforcement is essentially composed of three parts and comprises a proximal bar section extending along a central axis and two distal anchoring sections. The anchoring sections are arranged at the axially opposite ends of the bar section and are integrally formed on it. Each of the two anchoring sections has at least two legs that are perpendicular to each other. Furthermore, each of the at least two legs of the same anchoring section has at least one raised area and one recessed area on its mutually facing surfaces. The reinforcing component is made of plastic and is formed in one piece.

[0014] Preferably, the two legs, which are at an angle to each other, lie in a plane in which the central axis also runs. The two legs extend outwards from the central axis, enclosing an angle of preferably 45-135°, and particularly preferably about 90°. This results in a Y-shape for the respective anchoring sections.

[0015] According to the invention, each leg of the anchoring sections has at least one raised area and at least one recessed area. These are arranged on the surfaces of the legs facing each other. The raised area and recessed area of ​​a leg are preferably arranged directly adjacent to each other; alternatively, they can also be spaced apart from each other.

[0016] According to preferred embodiments, the raised area and / or the recessed area has a continuous, e.g. rounded, surface profile or alternatively a discontinuous, e.g. sharp-edged, surface profile.

[0017] Preferably, the reinforcing component has a surface profile, either partially or across its entire surface, but especially in the area of ​​the anchoring sections. This profile can be in the form of bumps, grooves, or furrows. Alternatively, the profile can also be a roughened or ribbed surface.

[0018] Preferably, the reinforcing component extends over a total length in the range of 150–250 mm, particularly preferably in the range of 180–220 mm. Furthermore, the reinforcing component is preferably made of a fiber-reinforced plastic.

[0019] The invention further relates to a concrete component consisting of a concrete composite material with reinforcement using an embodiment of the reinforcement component described above. The reinforcement is formed from a plurality of the reinforcement components described above. The reinforcement components are arranged in the concrete composite material such that they are completely surrounded by the concrete. By using the plastic reinforcement components, additional reinforcement in the form of steel mesh can be omitted. However, modified embodiments are also possible in which the reinforcement components according to the invention described herein are combined with other reinforcements within the concrete component.

[0020] The reinforcing components are preferably distributed statistically throughout the concrete structure. Alternatively, embodiments are possible in which the number of reinforcing components per unit volume or area is adapted to the specific static and dynamic requirements. Dimensioning guidelines for reinforcing components and reinforcing fibers are known to those skilled in the art, so these will not be described in detail here.

[0021] However, it is important that the reinforcement components according to the invention result in a continuous bond between the concrete and the reinforcement components, which is based on adhesive bond, friction bond and / or form bond depending on the load situation.

[0022] According to a preferred embodiment, the multitude of reinforcing components in the concrete composite are aligned along its flow direction. According to a modified embodiment, the reinforcing components are oriented randomly, so that the reinforcing effect is approximately the same in any direction.

[0023] The angled legs of the anchorage sections of the reinforcement components – which can also be described as having a bone-like shape – reduce the risk of the reinforcement components being pulled out of the concrete matrix of the composite concrete. If tensile forces occur on the reinforcement component, the surrounding concrete material causes a counteracting force on the legs, meaning the opposing legs are forced towards each other. The raised and / or recessed areas on the opposing surfaces of the legs improve the clamping effect in the compression zone that forms between the angled legs of an anchorage section. In this way, the high compressive strength of the composite concrete is utilized to maintain the bond between the concrete and the reinforcement under tensile forces.A positive-locking connection between the concrete matrix and the reinforcement element is ensured, and the maximum transferable bond force between the reinforcement element and the concrete composite is increased to the level of the tensile strength of the reinforcement element material. This effect is further enhanced by surface profiling of at least the perpendicular legs of an anchorage section in the form of grooves, studs, furrows, and similar features.

[0024] Further details, advantages, and embodiments of the present invention will become apparent from the following description of a preferred embodiment, with reference to the drawing. The drawing shows: Fig. 1 a side view of a reinforcement component according to the invention; Fig. 2 a detailed view of an anchoring section of the reinforcement component; Fig. 3 a diagram of the bond force occurring in a concrete component according to the invention.

[0025] Fig. Figure 1 shows a side view of a reinforcement component 01 according to the invention in a preferred embodiment. The reinforcement component 01 comprises a centrally located bar section 03, which has a central axis 02. An anchoring section 04 is integrally formed at each of the axially opposite ends of the bar section 03. The two anchoring sections 04 each have two legs 06 arranged at an angle to each other, which lie in the same plane in which the central axis 02 also runs. In modified embodiments, more legs may be provided, which may also be arranged in different planes. The two legs 06 of each anchoring section 04 extend outwards from the central axis 02 and thus form a Y-shaped anchoring section.

[0026] In the illustrated embodiment, the legs 06 of each anchoring section 04 form an angle of approximately 90°. This results in a double-Y shape, or bone shape, of the reinforcement component. Furthermore, on their surface facing the other leg 06 of the same anchoring section 04, each leg 06 has a raised area 07 and a recessed area 08, which are arranged directly adjacent to one another on the surface of the leg. Both the raised areas 07 and the recessed areas 08 of each leg 06 have rounded edges. In modified embodiments, the raised areas or recessed areas can be isolated, only on one of the two legs of the anchoring section, or repeated multiple times.

[0027] Fig. Figure 2 shows a detailed view of the anchoring section 04 of the reinforcement component 01. The already shown in Fig. The raised area 07 and the recessed area 08 shown are in Fig. Figure 2 is shown enlarged. When the reinforcing component 01 is embedded in or surrounded by concrete 09 and a tensile force acts in the direction of the central axis 02, clamping forces occur due to the Y-shape of the anchoring section 04 and the action of the concrete material on the legs 06. These clamping forces push the legs towards each other, as symbolized by the force arrows. The raised section 07 and the recessed section 08 improve the anchoring of the legs in the concrete 09 located between the legs 06. This ensures a more stable bond between the reinforcing component and the concrete.

[0028] Fig.Figure 4 illustrates the effect of the reinforcement element within the concrete structure using the function of the transmissible bond force. The diagram shows the progression of the transmissible bond force of the reinforcement element 01. The transmissible bond force initially increases to a maximum value, which is the maximum tensile force that the material of the reinforcement element can withstand. Only at this point does the bond lose its integrity, meaning that the anchorage sections 04 break out of the concrete or at least one of the legs 06 detaches from the reinforcement element due to material weakness. While adhesive forces ① occur initially, i.e., at very low bond force, frictional forces ② predominantly act on the surfaces of the reinforcement element as the tensile force and thus the transmissible bond force increase. With further increasing forces, additional frictional forces ③ arise as a result of the interlocking created by the raised and recessed areas on the legs.Only when the maximum tensile force that can be endured is exceeded and the anchoring section breaks away, does the transmissible bond force drop rapidly and only residual friction forces ② act on the rod section of the reinforcement component. Reference symbol list 01 Reinforcing component 02 Center axis 03 Staff Section 04 Anchoring section 05 - 06 thighs 07 Increase 08 In-depth study 09 Concrete

Claims

Reinforcing component (01) for concrete reinforcement comprising: - a proximal bar section (03) extending along a central axis (02); - two opposing distal anchoring sections (04) integrally formed on the axially opposite ends of the bar section (03), each anchoring section (04) having at least two legs (06) oriented at an angle to each other and extending outwards from the central axis (02); wherein the bar section (01) and the anchoring sections (04) are formed in one piece from plastic, characterized in that each leg (06) has at least one raised area (07) and one recessed area (08) on its surface facing the other leg (06) of the same anchoring section (04). Reinforcing component (01) according to claim 1, characterized in that the two legs (06) which are at an angle to each other lie in at least one of the anchoring sections (04) in the same plane in which the central axis (02) runs. Reinforcing component (01) according to claim 1 or 2, characterized in that the two legs (06) which are at an angle to each other enclose at least one of the anchoring sections (04) an angle in the range of 45° - 135°. Reinforcing component (01) according to one of claims 1 to 3, characterized in that the elevation (07) and / or the depression (08) have a rounded surface profile or a sharp-edged surface profile. Reinforcing component (01) according to one of claims 1 to 4, characterized in that it has at least section a surface profile, in particular in the form of bumps, grooves or furrows. Reinforcing component (01) according to one of claims 1 to 5, characterized in that it has a total length in the range of 150 - 250 mm. Reinforcing component (01) according to one of claims 1 to 6, characterized in that it is made of a fiber-reinforced plastic. Concrete component comprising concrete (09) and reinforcement, characterized in that the reinforcement is formed from a plurality of reinforcement components (01) according to one of claims 1 to 7, wherein the reinforcement components (01) are completely surrounded by the concrete (09).

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