Composite beam structure

FIELD: construction.

SUBSTANCE: in a composite beam structure there is one or more parts in the form of boards and a beam are connected together by means of an ingot. The beam structure comprises a steel beam, above which there is one or more mounting pins. Length of mounting pins at least three times exceeds the width of the upper surface of mounting pins. The pin is arranged with the possibility to transfer a force in connection between concrete and steel in the vertical and longitudinal direction relative to the beam. In a transverse cut perpendicular to a longitudinal direction of the pin there is at least one part, in which the pin width is more than on a section arranged directly below.

EFFECT: high-quality combination of technical parameters of a beam.

15 cl, 10 dwg

 

The present invention relates to composite structures, and in particular to a composite beam structure used in construction.

Under the composite structure can be understood by almost any design, composed of two or more materials, such as, for example, a typical design of reinforced concrete. Among the various structural elements of the operation preparation is always done at a time when the elements are solid, i.e. monolithic, or are joined by lap joints.

According to practice, the last time, under the composite design is usually understood as a combination of steel structures or sheet metal structures and concrete or reinforced concrete.

The most important and common by combining two different structural materials is the use of composite structures of steel and concrete, such as composite beams in high-rise residential, industrial or commercial buildings.

The principle of operation of the composite structures of steel and concrete is based on nearly full or partial interaction between the steel part and a concrete part. The steel part can be made of structural steel or structural steel sheet and the concrete part can be ordinary concrete, high strength concrete or lightweight concrete.

OS is ESD type composite steel-concrete construction, which is usually used as an overlay, can be considered as a single unconfined composite beam, which has a hollow-core slab/closed composite plate or the like. To ensure interaction between the steel part and a concrete part, most often the dowels, anchors, welded on the top flange of the steel profile, which have dimensions corresponding elastic connections.

The ratio of steel and concrete in composite structures must be optimal. Steel to better withstand the tensile stresses and the concrete - voltage collapse, so can be used the best features of each part. In addition, almost the same coefficients of thermal expansion of concrete and steel and a protective effect of concrete against corrosion of steel give extensive use of composite structures, such as composite beam structure. Concrete can also support thin steel parts and prevent them from warping and contraction. Intermediate slabs of concrete composite structures are typically formed from steel beams and concrete slabs or concrete slabs. Plate in the intermediate slabs of composite structures or lie on the main beams, or support beams. Basically the beams transmit the load from the plates for connection with the columns. Intermediate floors with composite design typically used in multi-storey commercial, office and residential buildings.

In the composite beam formed by concrete and steel (usually a concrete part in composite beam structure is molded, and the steel part is stretched), the interaction between the parts is carried out mechanically. Composite beams are set as support, after which they are stacked hollow-core plates or other plates, and the like. After laying slabs joints and beams are filled with concrete.

In addition, several other composite beam designs and layouts.

From the description of the invention WO 2004/031507 A1 known composite beam design, which includes several dowel pins, designed to create connections between steel and concrete and the dowel pins are sternvitamin products with a circular cross section, which is attached to the upper surface of the beam. On the upper end of the dowel pins have advanced the plot, all while watching from above, and arrangement, as described additionally includes a carrier grid, forming and improving the connection between steel and concrete.

In U.S. patent No. 6807789 described composite construction in which the beam is made of several parts, pacrep is connected to each other by welding, and in which the upper part of the beam structure is narrower than the lower part, and in which concrete casting completely fills the interior of the beam. A sheet metal part in the middle of the beam structure made of vertical openings.

In the description at 301821 described composite design, which made the bends to support the V-shaped product to be filled with concrete and manufactured by the flexible plate.

Known technical solutions have the following disadvantages.

Known designs require a relatively large number of processing operations, such as welding, bending, etc. and all of this is highly undesirable, or well-known technical solutions do not allow the act of bonding, i.e. interaction between steel and concrete in the connection the best possible way, so that the connection must act almost perfectly (or ideally, what is the purpose of the connection).

The present invention is the creation of a composite construction of a new type or, in more detail, composite beam design, allowing to minimize or eliminate the disadvantages of the known technical solutions and, thus, to operate and extremely high-quality combination of cost and other characteristics, i.e. technical indicators composite beams.

Known technically the ski solutions involve the use of multiple anchors, placed in communication with the beam. The advantage of the technical solution according to the present invention compared with the known technical solutions is that it requires less structural parts, i.e. anchors, compared with the latest technical solutions for the connection of steel and concrete between them and that when the same or a smaller number of dowels in the connection between the concrete and the steel provides the best composite effect.

The advantage of the technical solution according to the present invention compared with the known technical solutions is that it provides a better bond between steel and concrete than the known technical solutions, which performs communication requirements of rigidity and can withstand the loads and stresses to which they are exposed, in comparison with the known technical solutions, i.e. the relationship may be perceived vertical and horizontal forces in the design (resulting in different points of it).

When using round (dowel) pins placing a big number required in the longitudinal direction of the beam, and dowel pins, which have the shape of a rectangular prism, such as, for example, square, lack protruding surface of the receiving or transmitting vertical forces.

The advantage of order the solution according to the invention lies in their ability to avoid awkward flexible or other time consuming operations.

A further advantage of the technical solutions according to the invention is that when the composite beam structure according to the invention, the consumption of steel required for the composite beam structure, can be reduced to achieve a significant economic effect.

The invention differs from that specified in the attached claims, and, in particular, those specified in the characterizing part of paragraph 1.

Hereinafter the invention is described in more detail with reference to the accompanying drawings, where:

on figa shows a cross section of a simplified composite beams according to the invention when viewed from the end face of the beam;

on fig.1b shows a variant according to the invention when the observation side beams;

on figs shows a top view of dowel pins, oblique pinned in the beam;

on figa-2g shows a front view of the dowel pins of different shapes.

According to what is shown in figa in the beam 3 posted by product type plate 2, such as hollow-core slab. The height of the plate type, according to the figure, almost equal to the height of the beam 3, but the plate can also be considerably below the height of the beam. On top of the plate is formed casting 1, which is mostly concrete casting, and inside the casting remains one or more dowel pins 4, what are the locating pins are mounted on the upper surface of the beam by welding at the desired point.

With the protrusion (protruding surface) dowel pin 4 are transferred to the vertical and longitudinal force.

The height of the casting may vary considerably depending on different applications, but usually the height of the casting is from 40 mm to 200 mm

The length of the dowel pins at least three times the width of the upper surface of the dowel pins. In the best case, the length of the dowel pins at least approximately five times greater than the width of the upper surface of the dowel pins. The width of the upper surface of the dowel pins is usually from 20 to 70 mm, but can be wider or narrower, depending on the load beam or the magnitude required composite effect.

The length of the dowel pins may vary, but is usually at least 30% of the width of the upper surface of the beam. Dowel pins can also extend over the width of the upper surface of the beam.

Dowel pins are attached to the beam perpendicular or inclined, when viewed from above, as shown in figs.

As figure 1 shows for illustration only composite beam structure according to the invention, it doesn't contain steel profiles, composite plates or auxiliary reinforcement, etc. that remain fully or partially nutritive.

The technical solution according to the invention can use all the already known beams and types of beams, including I-beams, t-beams, WQ-beams, box beams, etc.

According to figure 2, the dowels can be in the form of a parallelogram or trapezoid, trihedron, or dowel pins may include one or more chamfers, such as, for example, shown in fig.2f. Dowel pins can have essentially the shape of a T, or I, or L. the dowels may also include one or more of rounding. It is extremely important that the locating pins are, therefore, at least one inclined surface or a curved surface, or two straight surfaces, or combinations of the listed surfaces.

The dowel pins may be hollow or perforated, and inside the dowel pins can be placed support rods, such as the round support bars, and these bars are designed to enhance composite action due to the increase in the surface setting. Round steel rods can also be used for anchoring the plate to the beam, and the base of the dowels can be placed mesh to enhance composite action. The mesh can be manufactured, for example, of steel.

Specialists in this field the minute technology is well known, that the invention is not limited to variants of the implementation described above, but may vary within the scope of the attached claims.

According to the principle of the invention applied technical solutions may vary within wide limits. It is also possible to consider, for example, this technical solution, which is already known to the locating pins and/or sections (sectional technical solutions), increases the adhesion of steel and concrete, combined with the alignment pins described here, for sharing with the aim to reach as many as possible of composite action in the connection between steel and concrete.

1. Composite beam design used in construction, in which one or more parts in the form of plates (2) and beam (3) are connected together, preferably by casting (1), and composite beam design contains at least one beam, such as a steel beam, on top of which is fixed one or more dowel pins (4), characterized in that the length of the dowel pins, pinned in the beam, at least three times the width of the upper surface of the dowel pins, dowel pin made with the possibility of transfer efforts in connection between steel and concrete both in vertical and in longitudinal is upravlenii relative to the beams, moreover, in a cross section perpendicular to the longitudinal direction of the dowel pin, with at least one portion in which the width of the dowel pin is larger than the area located directly under it.

2. Composite beam design according to claim 1, characterized in that the length of the dowel pin is at least 30% of the width of the upper surface of the beam.

3. Composite beam design according to claim 1, characterized in that the locating pins are triangular.

4. Composite beam design according to claim 1, characterized in that the length of the dowel pins at least five times the width of the upper surface of the dowel pins.

5. Composite beam design according to claim 1, characterized in that part or all of the dowels attached to the beam perpendicular or oblique direction from above.

6. Composite beam design according to claim 1, characterized in that the locating pins are in the shape of a parallelogram or trapezoid.

7. Composite beam design according to claim 1, characterized in that a protrusion or protruding surfaces of the dowel pin is transmitted vertical and longitudinal forces occurring in the connection between steel and concrete.

8. Composite beam design according to claim 1, characterized in that the installation shti what you have, essentially, T-shaped or I-shaped or L-shaped.

9. Composite beam design according to any one of claims 1 to 8, characterized in that the dowel pins are made of one or more chamfers and/or rounded.

10. Composite beam design according to any one of claims 1 to 8, characterized in that the locating pins are hollow and/or the dowel pins with holes.

11. Composite beam design according to claim 1, characterized in that the detail of the type of plate is a hollow-core slabs, or closed composite plate, or other part of the plate type.

12. Composite beam design according to claim 1, characterized in that the locating pins are made with the possibility of placing on the selection on the upper side of the beam depending on the shear force applied to the connection between the concrete and the steel beam.

13. Composite beam design according to claim 1, characterized in that the mounting pin is made of one or more holes into which can be inserted a rod, such as a round rod, longer than the dowel pin in the longitudinal direction.

14. Composite beam design according to item 13, wherein the rods are used in the anchoring plate to the beam.

15. Composite beam design according to claim 1, characterized in that the dowels are placed in the grid DL the improvement of composite action.



 

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