DE29805283U1 - T-prefabricated ceiling - Google Patents

Description

German Patent Office
Zweibrückenstr. 12
80297 Munich

• New registration 20.03.1998

Hans-Peter Heck, Eichkamp 1, 24217 Schönberg
T-precast ceiling

The invention relates to a T-precast concrete ceiling as a room-separating floor ceiling with minimal use of in-situ concrete to reduce construction moisture and shorten construction time. The construction method enables the installation of pipes, e.g. sewage pipes or e.g. ventilation ducts, at ceiling level, which in conventional construction would lead to structures or suspensions in the floor below.

The invention was therefore based on the task of developing a ceiling construction with the requirements for statics, as well as sound insulation as well as the extended installation options for building services and a smooth sub-surface.

According to the invention, this is achieved by a ceiling construction with the features of claim 1. The subclaims exist against the advantageous embodiment, arrangements as well as a method for producing the basic element and the ceiling structure.

Particularly advantageous is the shape (Fig. 1+2) of the steel mesh and the surrounding material made of sprayable, pourable or pourable material, preferably concrete.
existing load-bearing element, which is manufactured as a single-span slab on normal concreting tables, from a smooth trapezoidal web, which is repeated in the X direction and has the pressure-absorbing elements at a distance of Y, up to an angle of alpha = 0 (19), which is to be formed to stiffen and absorb, e.g. by buckling, the normal force, preferably with steel as a compression element (40) with at least 2 parallel compression rods and to absorb the transverse forces in the X and Y directions, a grid mesh (Fig.3, (41)) is to be installed between the upper compression zone and the lower tension zone.

-2-

f:'"i. f: O. Cl X

T-precast ceiling

-2-

Recesses in the web (13) are possible in the area of the maximum moment and between the lower ceiling slab and the upper pressure zone in the web. The element width (10) is advantageous, which results on the one hand from the production width, concreting tables for filigree ceilings and the maximum transport width in heavy transport and thereby reduces the number of joints (18) in the ceiling area. The connection between two adjacent ceiling elements is installed using anchor brackets (Fig. 4 ) bent from the existing sub-reinforcement (43) and protruding from the prefabricated part at the top and the additional rods (44), preferably steel, ground locally with the appropriate anchoring length, with an in-situ concrete layer (17) corresponding to the minimum concrete cover. The recesses (13) for channels are taken into account.

The cavity between the webs (20) can be used as an installation level.
The required sound insulation is achieved in claim 2 by recycling material (Fig. 2 (20)) made of broken concrete or broken pore-forming building material such as gas-aerated concrete, by mass and irregular air spaces. The absorption of the floor loads, consisting of the live load and the dead load of the floor, is achieved by installing a plywood board (21) with tongue and groove connection or formwork or chipboard.
The floor structure above the layer (21) is preferably designed as a dry screed (22)+(23). The element support, which is also the support point (15) for the walls above, has an intermediate block set back inwards, preferably made of concrete. The setting back for external wall supports serves to install a thermal insulation block (16) to reduce heat loss and the formation of cold bridges in the ceiling area between the webs. Another advantage is the quick assembly and the low proportion of building moisture, which allows direct dry construction and reduces the time required for the subsequent trades: interior construction.

To produce a T-precast ceiling element, normal concreting tables are used, which are also used for the production of filigree ceilings. The underside of the ceiling element is also the smooth table surface on which a frame formwork is placed, which limits the size and into which the complete reinforcement including the lattice girders and steel compression rods are inserted with the appropriate spacers and pre-concreted to the thickness of the slab and after a hardening time the formwork of the webs including the recesses is placed and filled in the second concreting pass.

Legend

10 Ceiling element (element width) 20

11 Lower supporting layer and visible 21 Ceiling underside 22 Pressure-absorbing webs 23 Recesses for installation transport sleeves 31 Intermediate block. Wall support 32 Thermal insulation block

In-situ concrete. Casting compound

12
13
14
15
16
17
18
19

Joint between 2 ceiling elements 41 Manufacturing angle for webs 42

Cavity or sound insulation material Fig. 1 Isometric view of overall structure Plywood board Tongue and groove Impact sound insulation boards Supporting layer (dry screed)

Ventilation shaft / sewer sewer

Compression bars (steel) Grid reinforcement Buckling line for folding the steel

Fig. 2 Cross section

Fig. 3 Grid reinforcement

Fig. 4 Reinforcement. Connection of

2 ceiling elements Fig. 5 Longitudinal section

-3-

Claims (7)

T-precast ceiling -3- Claim 1. T-precast ceiling, consisting of a lower surface that is smooth on the underside to absorb the tensile forces and at least 2 webs running upwards, along the load-bearing direction, next to each other in a grid to absorb the compressive forces. 2. T-prefabricated ceiling, consisting of the connecting structure to produce a total area
without additional ring beam. 3. T-prefabricated ceiling, consisting of supporting structure and upper cavity for
Installation of ventilation elements, as well as installation of sewage pipes, hot water and cold water
and electrical cables and sound insulation material. 4. T-prefabricated ceiling, with external wall support structure consisting of thermal insulation block and pressure-absorbing intermediate block to avoid cold bridges. 5. Steel lattice construction to absorb the compressive forces in the webs, consisting of at least two parallel compression rods in the upper layer, a zigzag-folded, spot-welded lattice reinforcement in the horizontal and vertical planes, enclosing the compression rods to absorb the transverse forces (buckling of the webs) in the X and Y planes. 6. Ceiling construction consisting of claims 1-7 supplemented by the entire superstructure by a supporting layer made of plywood or chipboard and a dry screed consisting of impact sound insulation and supporting layer for surface coverings. 7. T-precast slab, manufactured according to the above requirements on normal concrete tables. -4-