Truss
webs of Resaro's patented design.
THE RESARO ELEMENT,
BUILDING ELEMENT IN CONCRETE
CONCRETE
ELEMENT WITH A PATENTED TRUSS WEB
FOR CASTING OF CHORDS AND SLAB IN ONE SINGLE OPERATION
THE ELEMENT CAN BE USED WITH THE PLATE
FACING EITHER UPWARDS OR DOWNWARDS
TECHNICAL DESCRIPTION
THE STRUCTURAL ELEMENT consists of a thin concrete
slab with stiffening beams including chords of e.g. concrete
and a new kind of wire web in sections.
TRUSS WEB The web memberws are manufactured from bent round
bars of steel, arranged to a zig-zag pattern, but NOT plane bent
into zigzag.
TRANSVERSE BENDS The bar of the web is provided with a
transverse part, securing the bar when molded-in into the chord
or the plate and providing an opportunity to anchor forces in
several different planes, which results in a very efficient anchor.
Tests carried out at the Royal Institute of Technology in Stockholm
have verified this fact.
TRUSSES WITH WEBS BENT IN ONE PLANE ONLY, ARE EXTREMELY SENSITIVE
TO SMALL MOVEMENTS IN THE WEB BENDS and don't work to be
mold-in in cast chords. The chords splits.
CASTING OF CHORDS AND PLATE IN ONE SINGLE
OPERATION
The design of the truss web admit the two lower parts of the
chord form to meet in a strait connection and tighten up the
concrete composition below the chord. Accordingly the entire
structural element can be fabricated in one single working moment.
ANCHORAGE AND CARRYING OF LOADS A bar placed inside the
loops is parallel with the stiffening chords with the dual purpose
of providing anchor for the bent web as well as absorbing forces
for the carrying of the structural element.
A concrete chord gives considerable better strength and stiffness
than wood and is much cheaper than steel.
NO WELDING The structural element has a high load bearing
capacity. No problems with brittle fractures in welds at low
temperatures.
CAMBER The design permits that the structural element
is given a camber at manufacture by quite simply bending the
stiffening beams somewhat when being molded-in into the floor
plate. The element is then turned with the beams facing upwards.
Or simply by giving the form an arch.
OPTIONAL DESIGN The unique design of the element and its
adaptability permits manufacture of optional heights by extending
the spacing between the bends of the web wire.
MANUFACTURED HEIGHTS The element is intended to be manufactured
from a height of 250 mm up to a height of 600 or possibly 800
mm. For instance to give more space for installations.
EXTENDED SPANS Because of this, the element is capable
of fairly large spans. We can manage up to 8 m with non-tensioned
reinforcement in habitations.
PRE-STRESSED REINFORCEMENT The design of the web also
facilitates the installation of pre-stressed tendons in the slab
or in the chords depending on how the element is going to be
used.
In this way the element can be given improved load bearing capacity
in order to carry loads from partitions and/or provide larger
spans.
DELTA ET - WEB
TRUSS WEB WITH TRANSVERSE BENDS
The "Delta Et-web" is designed as a triangle
with an inner bend formed to a loop.
The inner bend loop forms the bending to a transverse part which
joins the web when molded-in into the chord and causes favorable
forces in different planes.
This results in a very efficient anchor.
Tests carried out at the Royal Institute of Technology in Stockholm
have verified this fact.
The crossed web bars gives opportunity to use a strait edge between
the chord form halves.
The bends of the web are made with simple devices: e. g. by hand.
The picture shows the element with a casting form below the element
plate and a suspended form for the chord.
A resilient material prevent against a seal between the form
halves. Principle outline.
D O U B L E - B E N TT
R U S SW E B
Bigger picture ?
The
double-bent truss web design gives the opportunity to a high-level
automatization of the web manufacturing.
The truss web consists of one single continuous bar.
The ready bent web will be cut into correct length adapted to
the length of the chords and step by step with the element production
output.
The picture also shows a patented design of a reinforced truss
end. The element rests on the truss end.
Of course the structural element can rest on the floor plate
as showed in the invention "Resaro Wall Support"
Principle outline.
The
geometry of the web unit is created by a zigzag bent bar, where
the bending is given a V-alike drawn out omega- or meander-shaped
design.
When the web bending is bent once more around an axis extending
along the chord, a transverse part (in fact two transverse parts)
forms in the bend.
This results in a very efficient anchorage of the truss web to
the chord when molded-in into the chord or the plate.
In this way we have created a continuous web with the advantage
of the zigzag plane-bent web: the continuity.
At the same time as the truss web has got the necessary design
making the molding-in procedure into slim chords and thin plates
possible.
When using this web 800 mm high concrete floor structural elements
with cast chords can be manufactured. Spans 14 m. Self-supporting.
The floor structural elements are ready to be installed in the
buildings direct from factory.
The floor surface can consist of a dismounting floor board system.
The concrete plate is given the necessary thickness to manage
the sound-absorbing and the fire-proof demands.
Field of applications: offices, hospitals, residences.
TRIANGLE BENT WEB TOGETHER WITH A CYLINDRICAL STEEL CHORD
Bigger picture ?
The Resaro system also includes
some patented designs of truss webs for steel chords.
Among others this triangle-shaped web which gives a good contact
surface for the weldings joining the webs and the chord.
Please be aware of that the strait free-situated parts are transferred
tangentially in a smooth radius around the chord.
Just the bent part of the web is welded.
It is very important that no tension forces from welds exists
in a compressed part of a web bar.
This web also include a transverse bending inside the concrete
plate.
The manufacturing of this web is very simple.
The structural floor element is intended for a self suspended
basement- or building-partitioning intermediate floor, for installations
in e.g. multi-stored houses.
The false ceiling is hanged up separate, elastic, for the best
sound reduction purposes between the floors.
The structural floor elements of course can be supported on the
walls, resting on the floor plate, according to the patent applied
Resaro Wall Support.
Elastic suspended false ceiling in combination with elastic support
on the load bearing walls, involves the qualifications for first-rate
sound-reduction. Please look at the Technology page.
The picture shows a structural element equipped with Resaro's
reinforced truss end.
Besides the Resaro designed truss-end being used for supporting
purposes, the Resaro truss-end also can be used to give the strengthening
truss a proper length without being dependent on the web member
spacing (centerline to centerline).
V-BENT WEB TOGETHER WITH RECTANGULAR STEEL CHORD
An additional example of a design
of a Resaro structural element.
The structural elements includes transverse web bendings inside
the floor plate. Plane bent webs does not work properly. The
web bendings are turned out. And in addition requires complicated
bending apparatus.
Designed like this the elements can be used with the plate facing
either upwards or downwards as desired.
The manufacturing of this web is extraordinarily simple.
In this way designed elements can be used as a bottom for the
house with the plate turned downwards resting on load bearing
thermal insulation placed straight on the ground.
The floor surface boarding will then rest floating on an smooth
rubber strip on the chords.
The walls will rest on edge beams integrated in the floor structure.
Please look at the photo
pages from building sites and the
Resaro Technology page.
|
PLENTY
OF SPACE FOR INSTALLATIONS, PERPENDICULAR OR DIAGONAL, WITHOUT
CUTTING OF HOLES |
Plan view of the directly on ground bottom element, Two-stored
semi-detached house GROUND FLOOR ELEMENT
Plan view of the upper floor structural element with the Resaro
Wall support TOP FLOOR ELEMENT
Photos RESARO ELEMENTS CONSTRUCTION
SITE, BOLLSTANÄS, PHOTOS LIST
RESARO AB
Storvretsv. 39,
142 31 Skogas, Sweden
Tel +468 5413 7800,
Mobile +467 0723 3090,
E-mail: info@resaro.se
Civ. Ing. George Wegler
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