Static structures (e.g. – buildings) – Openwork; e.g. – truss – trellis – grille – screen – frame – or... – Three-dimensional space-defining
Reexamination Certificate
1999-08-09
2001-03-27
Redman, Jerry (Department: 3634)
Static structures (e.g., buildings)
Openwork; e.g., truss, trellis, grille, screen, frame, or...
Three-dimensional space-defining
Reexamination Certificate
active
06205737
ABSTRACT:
FIELD AND BACKGROUND OF THE INVENTION
The invention relates to a reinforcing cage for holding buoyancy-free hollow bodies used in the production of reinforced concrete hollow-body slabs and ceilings. This kind of reinforcing cage is known from the registered German utility model G 88 13 325.7.
Recently, buoyancy-free hollow bodies have been used for hollow-body ceilings, with said bodies no longer requiring anchoring against buoyancy in contrast to earlier systems. Instead, they merely need to be placed on the formwork or the lower reinforcement layer. The hollow shapes comprise hollow-body formers which are open on the bottom, e.g. ribbed expanded metal where the air can escape at the top.
SUMMARY OF THE INVENTION
It is the object of the present invention to provide a reinforcing cage for such buoyancy free hollow bodies which allows arranging the hollow bodies in precisely defined positions both in the horizontal and the vertical plane and which ensures even covering with concrete of the area reinforcement and the web reinforcement.
In the reinforcing cage of the type mentioned in the introduction, in that an upper ring of round steel and a respective lower ring are attached to each other, spaced apart coaxially by means of standing braces. This object is met in that a container, open at the bottom, with a closed circumference, can be hooked into the reinforcing cage, with the cover wall of said container comprising aeration holes, with the container being at least held approximately coaxially in the reinforcing cage and with the circumferential wall of the container being at least approximately evenly spaced from the standing braces of the reinforcing cage.
According to an advantageous embodiment of the invention the upper ring is diagonally stiffened by means of horizontal braces.
Preferably the reinforcing cage is made from a number of U-shaped stays intersecting in the middle of the yoke, with said stays being arranged at equal angular distance; with the limbs of said U-shaped stays serving as standing braces.
A particularly important characteristic of the invention consists of the reinforcing cage comprising three U-shaped stays whose six limbs in horizontal section mark the corner points of a hexagon, with each of the two rings being shaped hexagonally and at the corners being welded to the limbs of the U-shaped stays.
Preferably, the reinforcing cages are in the shape of truncated pyramids, i.e. they taper slightly from bottom to top so that they are stackable. The same applies to the hollow-body forming containers which in the simplest case are of circular contours and respective conical shape. But in a preferred embodiment, the containers are also shaped as truncated hexagonal pyramids. At least the circumferential wall of the containers, but preferably in addition also the cover, comprise suspension means for attachment to the reinforcing cage and for coaxial positioning. Preferably the suspension means comprise flexible straps comprising eyelets for attaching them to the reinforcing cage using tie wire. These straps should be flexible to make it possible for the containers to be tightly stackable. In this the straps rest against the walls of the containers. Instead of straps, it is possible simply to provide pairs of holes or individual holes so as to be able to attach attachment rings or wires to the container.
Thanks to the reinforcing cages, the invention makes it possible to achieve very accurate positioning of the hollow-body forming containers. At the same time, the reinforcing cages serve as spacers for the upper reinforcement layers. They can be walked upon. Areas of web reinforcement with full concrete-encasement of the reinforcement and without change in the height of the cage, can be achieved very simply in that the reinforcing cages are used without hooked-in containers. The ceiling achieved using reinforcing cages according to the invention and hooked-in containers comprises a honeycomb structure which allows minimum wall thickness and is optimally shaped from the point of view of buckling surfaces.
The containers are matched to the reinforcing cages both horizontally and vertically, with the reinforcing cage preferably protruding from the container both at the top and at the bottom. Preferably the circumferential container wall is arranged so as to be equidistant from a circular area described by the limbs of the U-shaped stays. This distance should be approx. 2 cm which is sufficient for a concrete ceiling.
According to an embodiment, the lower hexagonal ring is attached to the ends of the six limbs. This embodiment is suitable for placing the reinforcing cage onto the lower reinforcement layer. By means of suitable spacers, the reinforcing cages can be precisely positioned and fixed to the lower reinforcement layers using tie wire. An alternative embodiment of the invention provides for the limbs of the stay protruding downwards below the lower ring. In this way, feet are formed which protrude through the lower reinforcement mats and rest on the slab's formwork. With this version, an advantageous embodiment of the invention comprises the use of positioning plates comprising three holes for inserting the feet of three limbs of three adjacent reinforcing cages. The insertion holes form the corners of an equilateral triangle. These positioning plates can be made of plastic or wood. Anchorage of the web reinforcement is provided by the hexagonal ring reinforcement.
It is understood that various thicknesses of ceilings or slabs require various sizes of reinforcing cages and thus also hooked-in containers. For example for a concrete ceiling 66 cm in thickness, a reinforcing cage is suitable whose lower ring comprises a diagonal of 70 cm and whose upper ring comprises a diagonal of approx. 60 cm with the vertical spacing between the two rings being approx. 46 cm.
A favorable machine production possibility arises, if the reinforcing cage is put together by a number of uniformly bended stays, advantageously with a U-shaped part. At one end of the U-shaped part a free leg arises. The axis of the leg is arranged outside the area of the U-shaped part. According to this fact, the reinforcing cage can be put together by a number of only one shape of steel.
According to the above described embodiments of the invention, the reinforcing cage and the hollow body are connected by latches and wires. Under circumstances the connection may be expensive and time consuming. This can be avoided advantageously, if the reinforcing cage shows a centrally fixed connection element for connecting the hollow body. For example a special element made of steel is designed and welded in the upper star of reinforcing bars. The hollow body then is hooked to this element. The number of connecting points is therefor drastically reduced.
The location of the hollow body is fixed advantageously, if the reinforcing cage shows spaces, e.g. distance flats for fixing the location of the body. A metal plate, fixed at the central connection element can also be used as a distance piece.
The assembly time can further be reduced advantageously if the connection element shows a projection, which can be brought into a locked position with the central opening of the container.
The connection element exists for example from the bottom to the top of one triangularly formed blade, one distance flat and one piece of steel. Distance flat and blade are arranged in distance, so that the thickness of the cover finds place in between.
For the assembly of the container in the reinforcing cage, the cage is turned upside down. Now the container is pressed with its top centrically into the blade with its opening. The plastic cover of the container is cut and abuts at the distance plate. The hollow body becomes fixed durably in his vertical and concentric location by a made turn of the hollow body.
According to an particularly advantageous embodiment, the connection element is built detachable. Through this, the assembly time can further be reduced.
For the assembly of the container in the reinforcing cage, th
Haussler Planung GmbH
Notaro & Michalos P.C.
Redman Jerry
LandOfFree
Reinforcing cage does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Reinforcing cage, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Reinforcing cage will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2533564