Note: Descriptions are shown in the official language in which they were submitted.
CA 02564519 2006-10-23
GROOVED STIFFENED PROFILE
SCOPE OF THE INVENTION
This is a new grooved stiffened profile with
mechanical characteristics superior to already known
structural profiles, that can be used in building
frameworks for roofing or large architectural vaults, that
efficiently supports dead weight.
The qualities of its maximum work stress notoriously
compete with conventional profiles because of the
stiffeners included in it. Additionally, the weight per
lineal meter is less than the first, which makes this
invention a versatile profile for building roof frameworks
and wide vaults.
Therefore, the scope of the invention is subscribed to
the universe of structural profiles used in building
frames.
HISTORY OF THE INVENTION
In Mexico, as well as in other countries, roofs are
built on constructions that have no intermediary supports,
and outside walls or columns that are separated more than
10 m (40 feet); therefore, and for economic reasons,
builders resort to the use of a structural system other
than simply supported beams. The structural configuration
used for this purpose is called a roof framework; a
framework is a structural configuration of elements
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normally supported at the ends and formed by a series of
elements, normally straight, laid out in a certain order
and connected one to another, in such manner that stress
transmitted from one element to another is the same or is
uniformly distributed. As a triangle is the only polygon
with a form that can be geometrically modified without
changing the length of one or more of its sides, the
framework essentially consists of a system of triangles.
In steel frameworks it is common practice that angles
be connected among themselves by a connecting plate and
rivets, screws and nuts, or welding, forming rigid
connections; the stability of a framework does not depend
on the rigidity of its joints.
We know that steel profiles have been greatly
substituting other elements such as wood, mainly because
longer open spaces can be built with steel.
Steel structural profiles most frequently used in the
construction of buildings are beams with (WF) wide flanges;
standard I beams, grooved sections, angles and plates.
After numerous investigations, a profile has been
developed with the technical and mechanical characteristics
of the conventional profiles described, but featured for
being stiffened, which provides it more rigidity, and
appears as an element that supports more loads, and
therefore, the same stress as a conventional profile
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support; with the use of the profile being proposed; this
profile supports more stress, which permits us to reduce
weight and build structures with wider open spaces.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a sectional view of the stiffened profile;
FIG. 2 is a perspective of the stiffened profile.
DESCRIPTION OF THE INVENTION
Referring to the drawings described above, the
stiffened profile of this invention is formed by a machined
part (10) in a grooved form, that fundamentally includes a
central part (20), some flanges (12) located in the upper
and lower parts and some finished ends (30), placed at the
ends of the machined part (10).
These flanges (12) or sides consist of a flat surface,
divided into three parts or sections: a first section (14)
with a flat surface, joined at one end to the central part
(20) by means of a bend (22), that with respect to the
central part (20) is placed at a ninety degree angle, and
at the other end, with a bend (24) to an intermediate
section (16) with a flat surface, displaced from the axis
of the flanges (12), and forming the stiffened section,
followed by a second bend (26) to a third section (18) with
a flat surface, that is placed at the same level as the
first section (14) followed by a bend (28) with one of the
finished ends (30), in such manner that these are at a
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ninety degree angle from the flanges (12), the axis of the
section (16) which, because of the bends, is displaced from
the central part of the first section (14) and of the third
section (18), in such manner that the middle section (16)
will be parallel to those sections.
On the other hand, the central part (20) that also has
a flat surface, consists of three sections: a first section
(32) with a flat surface, joined at the upper end to the
bend (22) of the top flange (12), that will be at a ninety
degree angle, to continue on to a middle section (34) with
a flat surface, which is displaced from the axis of the
central part (20), forming the stiffened section, and
joined through some bends (38), followed by a third section
similar to the first (36) with a flat surface, placed at
the same level as the first section (32), ending with a
second bend (22) at the lower flange (12) that will be at a
ninety degree angle with respect to the central part (20).
Finally, the finished ends (30) of the machined part
(10) consist of a flat and short-sized part at a ninety
degree angle with respect to the flanges, serving both as
an extremity and as base, and joint for a similar profile
meeting it, thus duplicating the resistance of the profile.
CA 02564519 2006-10-23
THE BEST MANNER OF CARRYING OUT THE INVENTION
To form the profile described above, a shaping or
rolling machine will be necessary, whereby,
through
various steps, the necessary bends will be made until the
5 complete figure of the profile is obtained. A quality
material with an adequate thickness must be used in order
that it submit to bending in every step in the shaping
machine without cracking or being damaged.
When using a shaping machine and not a bending press,
one must be sure that the finished product will have the
shape and measurements required in each of the sizes to be
produced. With such production equipment one can also
obtain prefabricated parts cut to size.
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SUMMARY OF THE INVENTION
According to one aspect, the invention relates to a
formed metal beam having a generally C-shaped profile which
includes a central part, opposed sidewalls extending along the
lateral sides of the central part, and opposed flanges
extending from the sidewalls comprising inwardly-turned walls
opposed to and parallel to the central part. The central
part, sidewalls and flanges define a hollow interior open to
one side. The central part and the sidewalls each comprise
first and second flat outer sections adjacent to the lateral
sides thereof, the flat outer sections being co-planar, and a
third section intermediate between the lateral sides. The
third section comprises a central channel recessed towards the
interior of the beam having a flat floor and non-parallel,
converging channel sidewalls. The width of the respect outer
sections and channel may all be substantially equal within
each of the central part and sidewalls.
In another aspect, the beam has smoothly curved bends of
90 degrees where the central part joins with the sidewalls and
the sidewalls join with the flanges.
In another aspect, the invention relates to method of
forming a beam as described herein, comprising the steps of
providing a flat metal blank, and forming the beam by shaping
the blank with a rolling machine or shaping machine in a
plurality of rolling or shaping operations.
