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(11) | EP 1 611 295 B1 |
| (12) | EUROPEAN PATENT SPECIFICATION |
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| (54) |
STEEL BEAM STAHLTRÄGER POUTRE D'ACIER |
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| Note: Within nine months from the publication of the mention of the grant of the European patent, any person may give notice to the European Patent Office of opposition to the European patent granted. Notice of opposition shall be filed in a written reasoned statement. It shall not be deemed to have been filed until the opposition fee has been paid. (Art. 99(1) European Patent Convention). |
[0001] The invention relates to a steel beam arranged to act together with concrete as a supporting composite structure for different slab systems, the composite structure being arranged to be supported at least at supporting points at the area of the ends and comprising two web parts and horizontal cantilever parts extending outside thereof, the web parts being arranged adjacent at a distance from each other and interconnected at one edge of each web part by means of a horizontal upper part, the web parts and the horizontal upper part being arranged to constitute a space that can be filled with concrete.
[0002] Steel beams of the above type, so-called steel composite beams, have long been known in the construction industry. During installation, these steel composite beams act as a steel beam for .installation-time loads. After the concreting, which takes place following the installation of the slabs, the beam acts as a composite structure together with the concrete. In said concreting, the beam is cast full of concrete in connection with the joint grouting of the slabs and a possible topping.
[0003] Several different solutions for steel composite beams have been developed over the years. Examples of previously known solutions include the solutions disclosed in the Finnish patent publications 85745 (see WO 90/12173) and 92089.
[0004] In particular US-A-5 560 176, family member of the latter, discloses as steel beam in accordance with the preamble of claim 1.
[0005] Steel composite beams are either single-span or plural-span beams. This means that the beam is supported either at its ends, i.e. in the area of the supporting points in the area of its ends or, alternatively, it comprises intermediate supports such that the beam also includes supporting points between the supporting points in the area of its ends. This is why it is not practical to make the beam similar over its entire length, but additional steel parts are fastened to the basic cross-section according to stresses.
[0006] Typically, the beam is subjected to a high shearing stress in the vicinity of the support arranged in the supporting point. In previous solutions, this high shearing stress has been received by welding a chamfered plate inside the beam in the vicinity of the supporting point.
[0007] The drawback in the above structure is that the plate increases the weight of the beam and thereby its price. The plate is also difficult to fasten on a production line because the welding position is unfavourable since, in practice, the labourer has to bend and at the same time reach upwards. Typically, the shearing force decreases linearly from the end of the beam towards the middle. However, the plate is of uniform section, its thickness being determined according to the highest value of the shearing force. Thus, part of the capacity of the plate is unnecessary and remains unutilized.
[0008] The object of the invention is to provide a steel beam allowing the drawbacks of prior art to be eliminated. This is achieved with a steel beam of the invention. The steel beam of the invention is characterized in that at least one peg member whose one end is fastened to the lower surface of the upper part and whose other end is provided with an anchoring expansion or widening section is arranged inside the space defined by the web parts and the horizontal upper part, in the area of the supporting points.
[0009] An advantage of the invention over prior art is that the peg members are light and their number can be changed very easily over the length of the beam. Accordingly, superfluous capacity and weight are not created in the beam. An additional advantage of the invention is that the peg members are much easier to fasten to the beam than the previously used plate. The peg members can be fastened to the plate constituted by the upper part of the beam from the top, i.e. the welding can be carried out from above for instance by placing the peg member into a hole provided in the plate. This eliminates the inconvenient working position caused by the welding of the previously used plate.
[0010] In the following, the invention will be described in detail by means of an exemplary embodiment described in the accompanying drawing, wherein
Figure 1 shows a steel beam according to the invention seen in the longitudinal direction of the beam, and
Figure 2 is a perspective view of a beam according to the invention.
[0011] Figures 1 and 2 show an embodiment of the steel beam according to the invention. The steel beam comprises two web parts 1 and horizontal cantilever parts 2 extending outside thereof. The web parts 1 are arranged adjacent at a distance from each other and interconnected at one edge of each web part 1 by means of a horizontal upper part 3. The web parts 1 and the horizontal upper part 3 are arranged to constitute a space 4 that can be filled with concrete.
[0012] In the example of the figures, the lower edges of the web parts 1 are interconnected by means of a horizontal lower part 5. The web parts 1 are provided with openings 6 enabling the feed of concrete into the space 4.
[0013] The above facts are evident to a person skilled in the art, and they are therefore not described in any detail herein. As for the above facts, reference is made to the previously mentioned Finnish patent publication 85745.
[0014] In accordance with the essential idea of the steel beam of the invention, peg members whose ends comprise an expansion or widening section acting as an anchoring are used in the vicinity of a supporting point. As the figures show, at least one peg member 7 is arranged inside the space 4 defined by the web parts 1 and the horizontal upper part 3, in the area of the supporting points. One end of the peg member 7 is fastened to the lower surface of the upper part, as shown particularly clearly in Figure 1. The other end of the peg member 7 is provided with an expansion or widening section 8 that helps the anchoring.
[0015] The number of peg members 7 over the length of the beam may change, avoiding unnecessary capacity. Accordingly, there may be either one or more peg members 7 according to the need, and the number may also change e.g. in the longitudinal direction of the beam. The peg members 7 may be placed in either one or more lines. Figure 1 shows a solution wherein the peg members are in two lines. The peg members 7 are placed in the area of the supporting points, i.e. at the ends of the beam and, if need be, also in the area of the supporting points between the ends of the beam.
[0016] The peg members can be made either from a smooth bar or from a ribbed bar. The shape of the expansion or widening section 8 acting as the anchoring end is optional as long as it constitutes an anchoring member. The shape of the anchoring end can be e.g. round, oval, etc.
[0017] The expansion or widening section acting as the anchoring end can be implemented by using any suitable technique. However, an implementation wherein the peg members 7 are made from jolt pegs has been found to be particularly advantageous.
[0018] The embodiment of the invention described above is in no way intended to restrict the invention, but the invention can be modified freely within the scope of the claims. It is therefore evident that the steel beam of the invention or its details no not necessarily have to be exactly as shown in the figures, but also other solutions are feasible.
1. A steel beam arranged to act together with concrete as a supporting composite structure
for different slab systems, the composite structure being arranged to be supported
at least at supporting points at the area of the ends and comprising two web parts
(1) and horizontal cantilever parts (2) extending outside thereof, the web parts (1)
being arranged adjacent at a distance from each other and interconnected at one edge
of each web part (1) by means of a horizontal upper part (3), the web parts (1) and
the horizontal upper part (3) being arranged to constitute a space (4) that can be
filled with concrete, characterized in that at least one peg member (7) whose one end is fastened to the lower surface of the
upper part (3) and whose other end is provided with an anchoring expansion or widening
section (8) is arranged inside the space (4) defined by the web parts (1) and the
horizontal upper part (3), in the area of the supporting points.
2. A steel beam as claimed in claim 1, characterized in that there are several peg members (7).
3. A steel beam as claimed in claim 2, characterized in that the peg members (7) are arranged in one line.
4. A steel beam as claimed in claim 2, characterized in that the peg members (7) are arranged in several lines.
5. A steel beam as claimed in any one of claims 1 to 4, characterized in that the peg members (7) are made from a smooth bar.
6. A steel beam as claimed in any one of claims 1 to 4, characterized in that the peg members (7) are made from a ribbed bar.
7. A steel beam as claimed in any one of claims 1 to 6, characterized in that the peg members (7) are jolt pegs.
1. Stahlträger, der vorgesehen ist, zusammen mit Beton als eine stützende Verbundkonstruktion
für unterschiedliche Plattensysteme zu fungieren, wobei die Verbundkonstruktion vorgesehen
ist, zumindest an Stützstellen an den Endbereichen gestützt zu werden, und zwei Stegteile
(1) und sich ausserhalb von diesen erstreckende, horizontale Kragträgerteile (2) aufweist,
wobei die Stegteile (1) in einem Abstand voneinander nebeneinander angeordnet und
an einem Rand jedes Stegteils (1) durch einen horizontalen Oberteil (3) miteinander
verbunden sind, wobei die Stegteile (1) und der horizontale Oberteil (3) vorgesehen
sind, einen Raum (4) zu bilden, der mit Beton gefüllt werden kann, dadurch gekennzeichnet, dass zumindest ein Zapfenelement (7), dessen eines Ende an der Unterfläche des Oberteils
(3) befestigt ist und dessen anderes Ende mit einem verankernden Ausdehnungs- oder
Verbreitungsabschnitt (8) versehen ist, innerhalb des durch die Stegteile (1) und
den horizontalen Oberteil (3) definierten Raums (4) im Bereich der Stützstellen angeordnet
ist.
2. Stahlträger nach Anspruch 1, dadurch gekennzeichnet, dass mehrere Zapfenelemente (7) vorgesehen sind.
3. Stahlträger nach Anspruch 2, dadurch gekennzeichnet, dass die Zapfenelemente (7) in einer Reihe angeordnet sind.
4. Stahlträger nach Anspruch 2, dadurch gekennzeichnet, dass die Zapfenelemente (7) in mehreren Reihen angeordnet sind.
5. Stahlträger nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Zapfenelemente (7) aus einer glatten Stange hergestellt sind.
6. Stahlträger nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, dass die Zapfenelemente (7) aus einer Rippenstange hergestellt sind.
7. Stahlträger nach einem der Ansprüche 1 bis 6, dadurch gekennzeichnet, dass die Zapfenelemente (7) Stauchzapfen sind.
1. Poutre d'acier conçue pour coopérer avec du béton pour former une structure porteuse
composite pour différents systèmes de dalle, cette structure composite étant disposée
de manière à être soutenue au moins au niveau des points d'appui situés au niveau
des extrémités et comprenant deux âmes (1) et des éléments horizontaux (2) en débordement
extérieur de celles-ci, les âmes (1) étant disposées de manière adjacente, à distance
l'une de l'autre et reliées entre elles au niveau d'un bord de chaque âme (1) par
un élément supérieur horizontal (3), les âmes (1) et l'élément supérieur horizontal
(3) étant disposés de manière à délimiter un espace (4) pouvant être rempli de béton,
caractérisée en ce qu'au moins une tige (7) dont une extrémité est fixée à la face inférieure de l'élément
supérieur (3) et dont l'autre extrémité est dotée d'un tronçon d'ancrage de plus forte
section ou largeur (8) est disposée, dans la zone des points d'appui, à l'intérieur
de l'espace (4) défini par les âmes (1) et l'élément supérieur horizontal (3).
2. Poutre d'acier selon la revendication 1, caractérisée en ce qu'il est prévu une pluralité de tiges (7).
3. Poutre d'acier selon la revendication 2, caractérisée en ce que les tiges (7) sont disposées sur une ligne.
4. Poutre d'acier selon la revendication 2, caractérisée en ce que les tiges (7) sont disposées sur plusieurs lignes.
5. Poutre d'acier selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les tiges (7) sont réalisées à partir d'une barre lisse.
6. Poutre d'acier selon l'une quelconque des revendications 1 à 4, caractérisée en ce que les tiges (7) sont réalisées à partir d'une barre nervurée.
7. Poutre d'acier selon l'une quelconque des revendications 1 à 6, caractérisée en ce que les tiges (7) sont des tiges refoulées.
REFERENCES CITED IN THE DESCRIPTION
This list of references cited by the applicant is for the reader's convenience only. It does not form part of the European patent document. Even though great care has been taken in compiling the references, errors or omissions cannot be excluded and the EPO disclaims all liability in this regard.
Patent documents cited in the description