Reinforced or pre-stressed concrete part which is subjected to a transverse force
OwnerOliver Matthaei, Hans-Peter Andrainventors
Life of this patent
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Abstract
The invention concerns a reinforced concrete or prestressed concrete part stressed by shearing forces with layers of reinforcement (22, 24) provided at its upper and lower sides. For shear protection at least one plane reinforcing part (30, 32, 34, 36) is provided between these layers of reinforcement which mainly extends at right angles to a surface of the reinforced concrete part and mainly over the entire distance between the layers of reinforcement (22, 24) and crosswise to at least one crack (50) occurring in the reinforced or prestressed concrete part under transverse load.
Claims19
Slab reinforcement,
- with a reinforced-steel column (10),
- with a slab part (20) of reinforced concrete or prestressed concrete with an upper layer of reinforcement (22) and a lower layer of reinforcement (24) which transfers loads into the reinforced-steel column (10),
- with reinforcing elements provided (10,12) in the reinforced-steel column (10) which penetrate the slab part (20),
- and with not less than one plane reinforcing part (30, 32, 34, 36),
- which encompasses a reinforcing element (12, 14) of the reinforced-steel column (10) and, starting from this reinforcing element (12,14),
- between the upper layer of reinforcement (22) and the lower layer of reinforcement (24) of the slab part (20) basically extends over the complete distance between these layers of reinforcement (22, 24),
- is essentially perpendicular to a surface of the slab part (20),
- and anchoring means (40, 42) to anchor the concrete.
Slab reinforcement in accordance with the main claim in which the plane reinforcing part (30, 32, 34, 36) extends to both sides of a fracture zone (50) occurring in the slab part (20) when the ultimate tensile strength of the concrete (29) of the slab part (20) is exceeded due to stress (Q;
- M).
Slab reinforcement in accordance with one of the claims above in which the means of anchoring are designed as a multitude of recesses (40, 42) sized to allow the formation of concrete plugs in them.
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) has beads (44).
Slab reinforcement in accordance with one of the claims above in which at least one border of the plane reinforcing part (30, 32) has recesses (46, 48) opening towards that border.
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) in horizontal projection has the shape of a U, V, hairpin or similar (FIG. 2, 3).
Slab reinforcement in accordance with one of the claims above in which the reinforcing element (12, 14) of the reinforced-steel column (10) basically is arranged inside a vertex of the plane reinforcing part (30, 32) encompassing the reinforcing element (12,14).
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) is corrugated.
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) is bent in the shape of a hat.
Slab reinforcement in accordance with one of the claims above in which recesses (40, 42) are provided in the plane reinforcing part through which reinforcement bars are placed.
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) is designed as spacer between the upper layer of reinforcement (22) and the lower layer of reinforcement (24).
Slab reinforcement in accordance with one of the claims above in which the plane reinforcing part (30, 32, 34, 36) is made of sheet steel.
Slab reinforcement in accordance with one of the claims above in which the means of anchoring (40, 42) are provided at an upper and a lower border of the plane reinforcing part (30, 32).
Method for the fabrication of a slab reinforcement with a reinforced-steel column (10) with reinforcing elements (10, 12) and a slab part (20) of reinforced steel or prestressed steel including the following steps:
- a) a lower layer of reinforcement is placed;
- b) at least one plane reinforcing part for shear reinforcement is placed onto the lower layer of reinforcement in such a way that it is mainly at right angles to it and encompasses a reinforcing element of the reinforced-steel column (10);
- c) an upper layer of reinforcement is placed onto this at least one plane reinforcing part in such a way that the latter serves as a spacer between the lower and the upper layer of reinforcement;
- d) concrete is poured over the part formed of the lower layer of reinforcement, the at least one plane reinforcing part and the upper layer of reinforcement.
Dependencies are inferred from the claim text.