DE1117843B - Reinforcement arrangement at the support connection of a reinforced concrete mushroom ceiling - Google Patents

Description

Reinforcement arrangement at the connection of a mushroom ceiling made of reinforced concrete Mushroom ceilings made of reinforced concrete are large-area load-bearing reinforced concrete structures without Interposition of beams rest directly on reinforced concrete supports and with these are rigidly connected. To achieve a better load distribution and to Good transfer of the loads in the supports are to the transition of the beamless slab so-called mushroom heads are arranged in the supports.

Used to reinforce the areas of the slab between the columns adapted to the tensile stress trajectories, they run radially from all sides Reinforcing bars towards the column.

In the production of these mushroom covers, the disadvantage arises in many cases on that a large number of reinforcing bars meet in the area of these mushroom heads, which, as far as they end in the area of the supports, are usually provided with hooks. This often ensures that the reinforcement is properly laid as well as careful Bringing in and good compaction of the concrete made more difficult. In this context is it has already become known, both above the supports in the plate and in the center of the field To arrange steel rings, in which the reinforcing bars arranged radially Engage hook. This made it possible to improve the routing of the reinforcement in the slab itself will.

Furthermore, it is also necessary that the - even if only small - Forward bending moments of the supports into the slabs or vice versa, which is why a Bending the column reinforcement into the slab or extending the slab reinforcement are required into the support. These circumstances make it even more difficult regarding the reinforcement and concreting conditions at the column head.

The invention is concerned with the task of being as economical as possible Find the reinforcement guide at the column head and at the same time a good connection the horizontal slab reinforcement to and onto the vertical column reinforcement Allocate a proper flow of forces from the column into the plate and vice versa guarantee.

Based on a reinforcement arrangement at the column connection of a mushroom ceiling, with the ends of the radiating ceiling reinforcement one above the support arranged around the anchor ring, the object is set according to the invention solved in that the bent ends of the ceiling reinforcement bars by a Press ring are clamped against the inner wall of the anchor ring and that the anchor ring has a flange provided with holes and protruding outwards in the plane of the ring, to which the reinforcing bars of the column are attached, for example welded.

In this way, mushroom covers can be compared with the known Reinforcement arrangements, reinforce much easier and more economical. Apart from that from the clear and concise management of the individual reinforcing bars one emerges not inconsiderable savings in steel by having all in such areas otherwise unavoidable overlap joints as well as most of the necessary Drop hooks. In a simple way, a non-positive connection between Reinforcement layers of the ceiling and those of the column created.

The drawing shows a section through one reinforced according to the invention Column head of a mushroom ceiling. The cross section of the ceiling plate 2 is designed so that the reinforcement above the support 1 is not downwards in the form of a mushroom head, but achieved by increasing the plate thickness accordingly will. Reach as a result of the reinforcement of the plate by the tapered mushroom head the shear stresses are not the size permitted in the absence of shear reinforcement.

The dashed stair line 4 is only intended to indicate how to do in In the case of a separate production of the column heads, taking into account a good absorption of the shear forces will make the production of the mushroom cover. in the In the case of a uniform production of columns and ceiling slab, this will fall Line does not matter.

An anchor ring 5, preferably made of ball cast, is arranged above the column 1. Ball cast is a high tensile strength building material that is cast similar to gray cast iron will and is attached wherever dynamic loads do not occur.

The rings 5 are designed in such a way that the reinforcing bars 6 of the ceiling plate, which are arranged radially and thereby adapted to the course of the tension trajectories, grip around the rings in a hook-like manner and connect snugly to them. Furthermore, the rings 5 have a flange 7 protruding outward in the plane of the ring, which flange contains a series of holes through which the reinforcement rods 8 of the supports are pushed and connected, preferably welded, to the flange of the ring. This creates a very strong connection between the ring and the column reinforcement.

The actual connection of the slab reinforcement n-it that of the columns is accomplished by pressing rings 9, which are used to press the ends of the reinforcement layers serve on the inner wall of the anchor rings 5 and are inserted into the rings from above. Rings made of cast steel can also be used instead of cast spherical rings.

Claims (1)

PATENT CLAIM: reinforcement assembly at the column connection of a fungal ceiling of reinforced concrete, in which the ends of the radially extending ceiling reinforcement rods enclose an above the support arranged armature ring, characterized in that the bent ends of the ceiling reinforcement rods (6) by a pressing ring (9) against the inner wall of the anchor ring ( 5) are clamped and that the anchor ring (5) has a flange (7) which protrudes outward in the plane of the ring and is provided with holes, to which the reinforcing bars (8) of the support (1) are attached, for example welded. Considered publications: Austrian Patent No. 65 623; French Patent No. 431455; U.S. Patent No. 1085,428.