DK2379821T3

DK2379821T3 - Reinforced concrete piece

Info

Publication number: DK2379821T3
Application number: DK10705921.4T
Authority: DK
Inventors: Tarik Ali Abulaban
Original assignee: Tarik Ali Abulaban
Priority date: 2009-01-08
Filing date: 2010-01-07
Publication date: 2015-05-11
Also published as: MA33030B1; CY1116326T1; AU2010204147A1; CN102439241B; MX2011007347A; ES2537650T3; BRPI1007026A2; JO3093B1; JP2012514706A; SG172893A1; US20100170183A1; HRP20150595T1; WO2010079416A1; RU2011130756A; KR20110124750A; KR20170097731A; AU2016216656B2; EP2379821B1; EP2379821A1; TN2011000315A1

Description

DESCRIPTION

Field of the Invention [0001] This invention relates to a reinforced concrete slab with a hollow passageway extending through the structural member or slab.

BACKGROUND FOR THE INVENTION

[0002] Reinforced concrete members such as girders, beams and slabs are commonly used in modern buildings. For example, horizontal slabs of steel reinforced concrete typically between 10 and 50 centimeters thick are frequently used to construct floors for buildings. In many industrial buildings, a thick concrete slab supported on a foundation is used to construct the ground floor of a building.

[0003] The use of concrete beams, girders and slabs with hollow passages extending therethrough are also known. For example, a U.S. Patent No. 2,938,255 discloses a method for manufacturing beams with longitudinal passages to reduce weight A more recent apparatus to provide hollow reinforced concrete floors is disclosed in a U.S. Patent of Breuning, No. 5,396,747. The Breuning disclosure utilizes a planar hollow reinforced concrete floor slab with "two dimensional structure" to obtain higher strength and stiffness, less volume of materials, and to obtain a balance between bending forces, shear forces and deformations and reduce the amount of cement.

[0004] A more recent concrete floor system and method of making floor components is described in a U.S. Patent No. 7,024,831 of Clark et al. As disclosed therein, the concrete floor system includes a plurality of parallel concrete beams made up of hollow concrete blocks for reducing weight and receiving a tension cable therethrough. Opposite ends of the cable are held on end plates inside recessed ends of each hollow beam. The ends of the beams are adapted for mounting next to the inside of the sides of a foundation wall. A top portion of each parallel beam is adaptive to receive a plurality of angularly shaped floor panels. The floor panels interlock next to the top portion of the beam. FR 2 588 899 discloses a reinforced concrete slab comprising a plurality of integral support members, wherein each support member comprises a plurality of reinforcing rods and a plurality of stirrups.

[0005] Notwithstanding the above, it is presently believed that there is a need and a potential commercial market for an improved reinforced concrete slab in accordance with the present invention. There should be a potential market for such structures because the volume of the hollow portions can be tailored for specific applications by using different shapes and materials such as Styrofoam, P.V.C. pipes and steel pipes. For example the type and shape of materials varies depending on load, span and depth of a beam. In a case where the beam depth is restricted it may be appropriate to use steel pipes or tubes to increase the carrying capacity of a beam.

[0006] The improved reinforced concrete slab in accordance with the present invention can also be used with the following advantages; reducing the weight of the concrete member due to the hollow area to thereby reduce the flexural movement due to the weight. This also means a reduction in cement and steel reinforcement, and increasing the moment of inertia for the member due to the added moment of inertia for the inserted pipe or tube that will lead to a reduction in deflection. The pipe or tube will carry part of the flexural moment and this depends on the pipe material and thickness. The result of applying this approach will provide less slag weight, less steel reinforcement and less cost. Further, the system in accordance with the present invention eliminates the drop beams and makes it possible to prepare and fix the reinforcement steel on the pipes before preparing the slabs and this will reduce the time and cost for workers.

BRIEF SUMMARY OF THE INVENTION

[0007] A reinforced concrete slab in accordance with the present invention includes all the features of claim 1.

[0008] In a preferred embodiment of the invention a reinforced load bearing structure includes steel reinforcing rods and steel stirrups that are welded together at their points of contact to form a cage like structure that is spaced from the hollow element.

[0009] The invention will now be described in connection with the following figures wherein like reference numerals have been used to designate like parts,

DESCRIPTION OF THE DRAWINGS

[0010]

Figure 1 is a cross-sectional view of a concrete beam in accordance with a first example;

Figure 2 is a perspective view of a reinforcement including steel reinforcing rods and steel stirrups as used in the first example; Figure 3 is a cross-sectional view of a concrete beam in accordance with a second example;

Figure 4 is a cross-sectional view of a concrete beam in accordance with a third example;

Figure 5 is a cross-sectional view of a concrete beam in accordance with a fourth example;

Figure 6 is a cross-sectional view of a concrete slab in accordance with an embodiment of the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENT OF THE INVENTION

[0011] A first example of a concrete beam will now be described in connection with figures 1 and 2. As shown, a longitudinally extending concrete beam 20 includes a longitudinally extending passageway 22 defined by a pipe or tube 23 extending through the beam 20 along its length. The beam 20 also includes a mass of concrete 24 surrounding the tube 23 and in contact therewith. As shown, the beam 20 has a generally rectangular cross-section, however, other shapes may be used for specific applications.

[0012] A plurality of steel reinforcing rods 26 extend along the length of the beam 20. For example, three longitudinally extending reinforcing rods 26 are provided on a lower side of the beam 20 and two reinforcing rods 26 are provided on an upper side thereof. As shown more clearly in figure 2, a plurality of steel stirrups 28 or rings are spaced apart along the length of the beam 20 and separated from the pipe or tube 23 by a portion of the concrete 24. As shown in figure 2, the steel reinforcing rods and steel stirrups are welded together at their points of contact to form a cage or skeleton.

[0013] A second example of a concrete beam is illustrated in figure 3 and is similar to the first example. For example, the concrete beam 20 has a generally rectangular cross-section and a hollow passageway such as a polyvinyl chloride (PVC) pipe 23 extending through the length of the beam 20. However, in this example the steel stirrups 38 have a rectangular shape as opposed to the circular stirrups 28 in the first example. The second example also includes five longitudinally extending steel reinforcing rods 26 with two of the reinforcing rods disposed in an upper portion of the beam 20 and three reinforcing rods in a lower portion thereof. As illustrated the reinforcing rods 26 are disposed with one reinforcing rod in each corner of the rectangular ring or stirrup 38 and an additional rod 26 is disposed in the bottom portion between the other two steel rods 26 on the lower portion.

[0014] Figure 4 shows a third example of a concrete beam wherein the beam 20 has a generally rectangular shape, a rectangular shaped ring or stirrup 38 and a plurality of longitudinally extending reinforcing rods 26 welded at their contacts points to the stirrups 38 in the same manner and positioning as in the third example. The difference between the second and the third example resides in the longitudinally extending hollow passageway 32. The hollow passageway 32 is defined by a steel tube 38 with a generally rectangular shaped cross-section as opposed to the PVC pipe in the first and second example.

[0015] Afourth example of a concrete beam is illustrated in figure 5 wherein the beam 20 is basically similar to the third example. However, in the fourth example the hollow passageway is defined by the plastic pipe 22 or steel tube 33 and is replaced by a longitudinally extending light weight solid structure 42 such as a rectangular or round Styrofoam, poly styrene foam element.

[0016] A reinforced concrete slab according to an embodiment of the invention is shown in figure 6. The concrete slab 50 defines a concrete base 52 or floor having a first thickness. As shown, the floor or base 52 may include a number of steel reinforcing rods 54 dispersed in a conventional manner as will be well understood by a person of ordinary skill in the art. The slab 50 also includes a plurality of parallel integral support members 60. As shown the support member 60 extend downwardly below the concrete base or floor 52 and have a thickness of about twice the thickness of the floor.

[0017] Each of the inner support members 60 includes a longitudinally extending hollow passage 22 as defined by a hollow PVC pipe. As illustrated the support member 60 includes the structure of the second example of the concrete beam. To be more specific, each of the support members 60 include a plurality of longitudinally extending reinforcing rods 26, a rectangular shaped ring or stirrup 38 and a hollow passageway 22 defined by a plastic pipe 23. The concrete slab 50 including the floor 52 and support member 60 are formed in a plastic or wooden mold 65 and rests on a foundation 66 such as a steel girder.

[0018] While the invention has been described in connection with its preferred embodiments, it should be recognized that changes and modifications may be made therein without departing from the scope of the appended claims.

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 • US2938255A F00031 • US70248318 Γ00041 • FR2588899 [0004]

Claims

A reinforced concrete piece (50) comprising: a concrete floor (52) of length, width and thickness and a plurality of parallel integral support members (60) or beams extending over the floor (52) of a first direction and extending downward therefrom with a thickness greater than the thickness of the floor (52), each of said supporting members (60) having the structure of a reinforced load-bearing structure, comprising: an exterior concrete load-bearing structural member (24) extending longitudinally, and an inner hollow member (23, 33) extending longitudinally and completely enclosed by concrete within the longitudinal exterior load-bearing structural member (24); a plurality of reinforcing bars (26) extending through the exterior concrete load-bearing structural members (24) extending longitudinally; a plurality of braces (28, 38) spaced longitudinally along the internal hollow member (23, 33) extending longitudinally and around the member in contact with the reinforcing bars (26) and enclosed by the longitudinally extending outer load-bearing structural member (24), wherein the plurality of reinforcing bars (26) and the shackles (28, 38) are interconnected, preferably welded together, at their contact points, the plurality of reinforcing bars (26) and the plurality of braces (28, 38) are completely enclosed within the concrete by the concrete load-bearing structural member (24); wherein the reinforcing bars (26) and the shackles (28, 38) are made of metal, in particular made of steel; wherein the concrete load-bearing structural members (24) extend along a linear axis and the longitudinal direction lies in a horizontal plane at installation and the shackles (28, 38) extend spirally around the reinforcing bars (26).

Reinforced concrete piece according to one of the preceding claims, characterized in that the outer concrete load-bearing structural part (24) extending longitudinally has a rectangular cross-section.

Reinforced concrete piece according to one of the preceding claims, characterized in that the internal hollow element (23, 33) extending longitudinally comprises a steel pipe.

Reinforced concrete piece according to one of the preceding claims, characterized in that the internal hollow element (23, 33) extending longitudinally is a plastic pipe.

Reinforced concrete piece according to one of the preceding claims, characterized in that the thickness of the parallel integrated support parts (60) in the downward direction corresponds to approx. twice the thickness of the floor (52).

A reinforced concrete piece according to one of the preceding claims, wherein the hollow element (23, 33) has a rectangular cross-section.

Reinforced concrete piece according to one of the preceding claims, wherein the hollow element (23, 33) is filled with a foam plastic.

A reinforced concrete piece according to one of the preceding claims, wherein the hollow element (23, 33) is arranged under a neutral axis of the exterior concrete load-bearing structural part (24) extending longitudinally.