The
efforts of the authorities in Dallas and a substantial donation have
made possible the flight of Calatrava in Texas.
Hi,
I warned him several times to Calatrava:
"You
do not do this to me, I have many commitments in Dallas and I cannot
devote much time to contemplate the surrounding landscape".
Obviously, he has ignored me (again) and has designed two bridges (in
fact three) that not only have been around the World: have forever
changed the image of the most powerful city of Texas.
If
someone thought at some point that the assassination of President
John Fitzgerald Kennedy was going to turn the tide of the city,
remained in ostracism, nothing to do with the reality: this city has
given an example of fortitude and strength to the rest of the State
and, therefore, to the rest of the Nation.
Okay, I admit, I speak with passion because for me it is the best
city in the United States, and clear, I can't, I want not, (I must
not) hide my passion for the Texas City where so many good business
has closed my family since time immemorial, I, Rodolfo, owe much to
this city, personal and economically.
Margaret
Hunt Hill of Trinity river
The
two bridges designed by Mr. Calatrava cross the same river, Trinity
River, the first, already completed in the year 2012 and that it
crosses the Interstate 35, was a revolution aesthetic to the city,
the Margaret Hunt Hill Bridge. The opening was delayed a few days by
my fault, the Dallas
authorities had warned me that without my presence was not going to
inaugurate the bridge, in the end, it was a pleasure to be the guest
star for this fantastic construction. The
bridge cost 120 million of dollars (110 million of euros), consists
of a tour of 365 meters, where by their six-lane, cross per day more
than 14,000 vehicles (some say that 40,000).
The shape of the bridge does not simulate an arc, in my opinion,
represents a gateway to the city, the cultural and active part of
this (my favorite).
I
counted 58 steel strands (a pleasure) that cross over the bridge in
both directions, and that pass through the white structure in its
upper part, a milestone. The total height is almost 122 meters and
its structure is made up of sections of steel white that are
introduced into the bed of the River on both sides of the rails. The
advantage of this type of structure is that the forces of steel
burden are transmitted to the foundations (in the middle of the
river) in the form of vectors (representation of the address of the
forces) perpendicular to the horizontal plane, this greatly reduced
the area of distribution which have to withstand loads.
The cables are installed directly on the axis of the bridge,
supporting the beams that act in the form of overhang on both sides,
in this respect is important to consider the calculation with two
possibilities: that a section is fully charged and the other not and
that both are charged. I know that it is pretty obvious, but it is
worth recalling it.
A
very funny question (in my view) are the critical voices that have
arisen because this bridge is very similar to the other two located
in Reggio Emilia (Italy). It's funny because were also designed by
the same engineer and architect, Calatrava; for example, it is as if
we criticize to Richard Gere by to do two films of the same genre, is
simply ridiculous.
Margaret
McDermott of Trinity River
The
other two bridges called Margaret McDermott, correspond to the
Interstate 30 and are in honour (as the first, already described) to
the deceased Margaret Hunt Hill, which was a famous philanthropist of
the pass century (1915-2007) in the State of Texas. Yesterday I was
"monitoring" as they lifted the white arches of steel that
will have a maximum height of 83.5 meters and will include a tour of
343 meters (fantastic). The
typology of these bridges is more classic: are arches of which emerge
the steel cables that support the beams of the bridge, these wires
are distributed evenly to bear the burden by identical sections.
This makes the forces to which the steel elements are subject believe
tangent vectors to the arch at its junction with the bases of
concrete, in other words, appear greater tensions in the foundations.
The
American
Bridge company
is the contractor responsible for the supply and placement of all the
elements of the steel bridges, including, of course, the arches and
98 support cables, in total, the outrageous amount of 3.292 tons of
this metal (I know Islands who weigh less). In their installations
are made pieces so that its realization, transfer and commissioning
work is more simple and practical as possible. We must bear in mind
that these pieces should be placed in its final position, supported
and then soldered with precision, as always, these welds will be made
by professional and proven by a equipment thoroughly (the occasion
requires it).
Disagreements
As
in all the great works of administrative origin, the controversies
and the changes of opinion have been present. First
was replaced the original project of the Margaret McDermott Bridge,
composed of four beautiful white arches of steel, by a new with the
two current arcs for the amount of 104 million dollars (95 euros),
which was later increased to the 115 (105 euros).
However, the Government Group with 10 votes in favour and 2 against
approve the new budget, after a magnificent anonymous donation of 5
million dollars, budget cuts and extra contributions of several
administrative entities, all for Dallas.
Another
clear disagreement, was echoed in the room of the City Hall of
Dallas, was given for one of their councillors (Scott Griggs),
considering that the maintenance of the bridges (Hunt Hill and the
McDermott) would have an annual cost of 600,000 dollars (550,000
euros), a 1 per cent of the budget of the city for all their vials.
Luckily for us, they did not take into account this fact.
The
wings of Calatrava are ending of deploy, in them, apart from
circulation of vehicle engine (which will have rest areas to watch
the sailing ships navigating by the river) will also enjoy the
walkers, cyclists, persons with reduced mobility, and to parents with
prams, all well delimited by a few curbs designed exclusively for
this event well as lights for view the magnificence of the set. I
repeat: Calatrava has done it again. Bye
bye.