Reinforced concrete element and composite beam with reinforced concrete element

Abstract

A reinforced concrete element for the production of a composite beam is proposed, wherein the reinforced concrete element consists of a cast form and integrated reinforcement. According to the invention, it is proposed that shear connectors are cast into the reinforced concrete element.

Description

[0001] The invention relates to a reinforced concrete element and a composite beam with a reinforced concrete element according to the invention.

[0002] In building construction, so-called composite beams or composite beam structures are frequently used. Suitable composite measures are used to create a shear-resistant connection between steel structures and reinforced concrete elements.

[0003] A shear-free connection is one in a composite structure where the connection between different materials is designed in such a way that no shear forces are transmitted. This is often achieved through special connection techniques that ensure the materials can move independently of each other without generating shear stresses. Reinforced concrete is one of the best-known composite structures, combining the tensile strength of steel with the compressive strength of concrete.

[0004] Furthermore, composite steel construction or composite beams are known, whereby a composite beam is a structure in which a steel beam is structurally combined with concrete to achieve high load-bearing capacity and stability. Steel beams are often connected to concrete slabs or reinforced concrete elements to construct bridges and buildings.

[0005] Headed studs have become the standard for connecting steel and concrete in this application. These studs are welded onto the steel beams, creating a shear-resistant connection between the steel beam and the concrete element.

[0006] Reinforced concrete elements can be constructed on-site using cast-in-place concrete or supplied as precast elements. When using precast elements, the composite action is achieved by grouting the joints with a concrete mix. In both construction methods, the actual load-bearing capacity is only realized after the concrete in the connection area has hardened, i.e., several days after the concrete mix has been poured. One of the advantages of such beams or composite beam structures is their high flexural strength and stiffness.

[0007] Composite beams or composite beam structures are designed and regulated in Europe according to Eurocode 4. A disadvantage of this construction method is that the composite beam only forms after the concrete mass in the shear connector area or joint has set.

[0008] The purpose of the invention is to propose an alternative structure for a composite beam that reduces the effort required on the construction site.

[0009] The problem is solved according to the invention by an embodiment according to the independent claims. Further advantageous embodiments of the present invention are found in the dependent claims.

[0010] A reinforced concrete element for the production of a composite beam is proposed, wherein the reinforced concrete element consists of a cast form and integrated reinforcement. Generally, a composite beam is understood to be a steel-composite structure.

[0011] According to the invention, it is proposed that composite materials are cast into the reinforced concrete element.

[0012] In a preferred embodiment, a section of the shear connector can protrude from the molded body, and this section can, in particular, have a thread. In an alternative embodiment, the shear connector can have an internal thread. The proposed threaded connections allow for easy assembly and disassembly of the reinforced concrete elements.

[0013] For example, the reinforced concrete component can be an elongated load-bearing ceiling element with several shear connectors cast into both ends.

[0014] Furthermore, a composite beam comprising a reinforced concrete element and two steel beams is proposed, wherein the steel beams have through holes through which the composite elements or fasteners are inserted.

[0015] Preferably, the connection between the reinforced concrete element and the steel beams is made via screw connections.

[0016] One advantage of this design is that a reinforced concrete component according to the invention can be manufactured using dry construction methods, so that a load-bearing composite beam is created immediately after assembly and is fully load-bearing right after installation. Furthermore, the structure could be disassembled and reassembled without damage.

[0017] The invention will be explained below with the aid of figures. The figures show, in detail: Fig. 1a, b: Composite beam with steel girder according to the standard. Fig. 2: Reinforced concrete elements. Fig. 3: Composite beam according to the invention.

[0018] Figure 1a Figure 1 shows a composite beam 1a with a steel beam 2a according to the standard design with welded-on headed studs 3 embedded in the joint sealant 9. Also shown is the reinforced concrete element 8a, which, for example, is placed on the steel beam as a prefabricated element before the joint sealant is applied. Figure 1bOnly the steel beam 2a with the headed stud dowels 3 is shown in the side view, where the bending of the headed stud dowels 3 in an assumed limit state, which occurs under a shear load, is shown as an example.

[0019] Figure 2 Figure 1 shows a reinforced concrete element 8b according to the invention, which differs from the standard version in that the shear connectors 5 are already cast into the reinforced concrete element 8b. The shear connectors 5 are cast into the reinforced concrete element 8b in such a way that a section 10 of the shear connector 5 protrudes from the reinforced concrete element 8b. Production can take place in a precast plant, and the element then only needs to be installed on the construction site.

[0020] In a preferred embodiment, the subsection 10 has at least a partial thread 6. Instead of the external thread on the bonding element, a bonding element with an internal thread can also be used.

[0021] Figure 3 Figure 1 shows the finished composite beam 1b with the reinforced concrete element 8b according to the invention. Instead of welded-on headed studs, through holes 11 are provided in the steel beam 2b, through which the shear connectors 5 are inserted. A bolted connection is provided to create the connection or composite. The nut 7 can be secured against loosening after the composite has been created, e.g., by means of a locking element, by bonding, etc. The composite beam is effective immediately after the bolts are tightened. Reference symbol list

[0022] 1a, bComposite beam 2a, bSteel beam 3Head bolt dowel 4Weld seam 5Composite means 6Thread 7Nut 8a, bReinforced concrete element 9Joint grouting 10Part section 11Through hole 12Shaped body 13Reinforcement

Claims

1. reinforced concrete element (8b) for the production of a composite beam (1b) comprising a cast formwork (12) and an integrated reinforcement (13) characterized by the fact that The composite element (8b) is cast into the reinforced concrete element (8b) wherein a section (10) of the composite element (5) protrudes from the molded body (12) and has a thread (6).

2. reinforced concrete element (8b) according to claim 1, characterized by the fact that the bonding agent (5) has an internal thread.

3. reinforced concrete element (8b) according to claim 1, characterized by the fact that the bonding agent (5) has an external thread.

4. reinforced concrete element (8b) according to claim 1, characterized by the fact that the reinforced concrete component (8b) is an elongated load-bearing ceiling element, with several shear connectors (5) cast into both ends.

5. Composite beam (1b) with a reinforced concrete element (8b) according to any one of claims 1 to 3, comprising two steel beams (2b) characterized by the fact thatthe steel beams (2b) have through holes (11) through which the connecting elements (5) or fasteners are inserted.

6. Composite beam (1b) according to claim 4, characterized by the fact that the reinforced concrete elements (8b) are screwed to the steel beams (2b) via the shear connectors (5).

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