Static structures (e.g. – buildings) – With component having discrete prestressing means – Beam – girder – or truss construction
Reexamination Certificate
1999-04-20
2001-06-26
Kent, Christopher T. (Department: 3635)
Static structures (e.g., buildings)
With component having discrete prestressing means
Beam, girder, or truss construction
C052S223900, C052S127120, C052S250000, C052S582100, C052S583100, C052S601000, C052S691000, C052S749100, C052S749100
Reexamination Certificate
active
06250031
ABSTRACT:
FIELD OF THE INVENTION
The present invention concerns double slope beams in vibrated or pre-compressed reinforced concrete.
BACKGROUND OF THE INVENTION
These beams have always been made in one piece, with an uninterrupted metal reinforcement, but not without disadvantages and inconveniences. The beams can be of various lengths and sections and with different slopes. Their construction in one piece requires formwork which is particularly bulky, not only because of its length but also because of its height, especially for beams with a steep slope. The handling of these beams is extremely difficult due to their dimensions and their relative weight. Then the transport of these whole beams, in particular those which are long, always presents problems, beyond being very expensive, especially when it is necessary to resort to exceptional transport and/or there is a need to travel on narrow or mountainous roads
All these difficulties mean that up to now beams have been constructed below a certain dimension, in order not to aggravate the problems of bulk, transport, etc., even if the demand for certain installations would be for longer beams.
On the other hand, a simple subdivision of the said beams into two parts would make the handling and transporting simpler, but would bring with it problems of joining the two parts and of maintaining the strength and static nature of the beams when in use and under load.
SUMMARY AND OBJECTS OF THE INVENTION
The present invention however, concerns the supply of a double slope beam, of the above mentioned type, constructed of two complementary halves, while at the same time positively solving the problems of the reinforcing and joining of the two halves so that the complete beam results in having strength and static nature characteristics at least comparable, if not actually superior, to those of a one piece beam.
The following are among the advantages that can be derived from this invention:
smaller dimensions, at least in height, of the formwork for the two halves of the beam in that they can be made flat, on the ground, and not in the sloping position;
greater simplicity of casting, as this is carried out at lower levels;
greater ease of handling due to the lower weight of each component half;
greater ease of transporting, even in difficult conditions, given the reduced length of each component half and the possibility of using standard transport trucks avoiding the need for exceptional transportation;
this results in a containment of construction and transport costs, and having solved the problem of transportation;
the possibility of constructing beams of a longer length than with the noted technique and with slopes of between P
10
and P
50
.
These advantages are obtained with a beam in vibrated or pre-compressed reinforced concrete, made up of two complementary opposing halves, whose mating parts incorporate steel joining plates, which are anchored in the reinforcing by means of tie-rods and which are joined together by means of bolts at the moment of the two halves coming together to form a whole beam.
REFERENCES:
patent: 3465484 (1969-09-01), Zaldastani et al.
patent: 4612751 (1986-09-01), Gloppen et al.
patent: 4781006 (1988-11-01), Haynes
Kent Christopher T.
McGlew and Tuttle , P.C.
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