![]() |
![]() |
Professors with leaning difficulties
The Guardian (London &
Manchester)
August 19 1997
Domenico Pacitti
The great Pisa teaser – how to save the tower – is driving a rift through the academic world. Now time is running out for the dons. Domenico Pacitti tells it straight
A
COMMISSION of 14 university professors has been given an 18-month deadline
to reduce the tilting of the Leaning Tower of Pisa. The brief,
from Italy's vice-premier and minister for national heritage, Walter
Veltroni, is part of an EU-funded campaign to conclude restoration of
the world-famous landmark, and reopen it to the public.
Visibly shaken after his meeting with the minister, commission coordinator
Michele Jamiolkowski, a geotechnics professor at Turin Polytechnic, said:
"We very probably won't manage to meet the deadline and are now about
to enter a new phase of this Calvary called the Tower of Pisa."
Meanwhile, consortium site manager Paolo Heiniger confirmed that the next
step to correct the 4.6-metre incline would be to substitute the 835 tons of
lead ingots placed at the north base of the tower between 1993 and 1995,
with an underground anchorage system. Details of further measures, he said,
would be released only after work resumed in the autumn.
But Vittorio Novelli, founder and chairman of an international cultural
association for the protection of the tower, said that if project details
were not forthcoming, it was a sure sign the commission itself probably did
not know what it was going to do next.
"The real problem is that they are more concerned with prestige and
easy money than they are with saving the Tower," said Mr Novelli, who
has been following the project closely for eight years. "Some of these
experts are normally highly competent, but Italian academic commissions tend
to conform to strict codes which seriously distort normal, accepted
behaviour. The many millions of pounds that have been squandered could have
been spent on a more just cause. It is a disgrace."
Abnormally high fees, superfluous research and a system of patronage within
the commission have been widely reported. Altero Mattioli of the National
Alliance Party, who is said to have called for a government investigation,
puts total spending
on the tower to the end of 1995 at £40 million. The tower has been closed
since January 1990, and over the past seven years almost £10 million of
public money has been paid to the local church authorities, which own the
tower, as compensation
for lost revenue from tourism.
The tower, which was begun in 1173, registered a five-centimetre inclination
to the south only ten years after construction began. By a sort of miracle
of architecture the galleries of the top three levels were built higher on
the south side to
counterbalance the lean. With the belfry in place and work completed in
1372, the inclination was 143 centimetres. It later evened out at about 1.2
millimetres per year.
Since 1908, there have been 16 commissions with 150 members, almost all
university professors. The 1990 commission was to have done its work in
three months, but seven and a half years later it still has not completed
the project. It was nominated by former premier Giulio Andreotti, now on
trial for criminal association and complicity in murder, and budget minister
Cirino Pomicino, imprisoned for theft and corruption.
John Burland, professor of geotechnics at Imperial College, London, and
commission member since January 1990, has been heavily criticised in Italy
on the grounds of lack of adequate historical research and failure to carry
out the necessary site surveys in connection with his lead weights project
and its allegedly disastrous consequences.
Professor Burland, who proposed and piloted the ingots project – though he
does stress the ultimate collective authority and responsibility of the
commission – explains: "In order to gain temporary stability, in May
1992 we applied 12 steel tendons to the first storey to secure it against
collapse, and in July 1993, we placed 600 tons of lead ingots on the masonry
to the north side. The next step, required for aesthetic reasons, was to
substitute the lead weights with an underground anchorage system, called the
10-anchor solution."
"But on the night of September 7 1995 things began to go wrong.
Localised ground freezing for the instalment of the system went amiss owing
to the presence of an unforeseen obstacle - an undocumented ring of concrete
joining the circular walkway
to the tower. As we began to freeze, the tower began to move and we stopped
the works.," said Professor Burland. "To control the movement we
rather urgently added another 235 tons of ingots and at one point the crane
itself. Over the last year the tower has been remarkably stable." He
added that a new method of excavation has now been developed for permanently
stabilising the tower. It involves the extraction of very small quantities
of soil from the north side."
"This should take about two years," he said, "and will allow
the tower to settle and gradually reduce its inclination. The final
reduction of inclination would be to 0.6 of a metre, a difference in
overhang that would be imperceptible to tourists and which
should last a while, perhaps 300 years."
One of Professor Burland's critics is Piero Pierotti, who teaches history of
mediaeval architecture at the University of Pisa, and who is considered by
many to be the world's leading historian of the tower.
Professor Pierotti said: "The project was badly conceived from the
start by engineers who had to spend a lot of money in a short time. The
first negative signs were the steel tendons applied directly without a
wooden interface, and the absence of support beams to protect its hollow
walls – the 835 tons of weights which cannot be moved have blocked the
tower for four years now."
In the most important study of the history of the tower, which concluded
that the best policy was one of non-interference, Professor Pierotti
explains how, by a dual sinking and inclining process, the monument had,
through the centuries, achieved a delicate balance, the disturbance of which
might easily prove tragic.
"The work of Professor Burland on what has now gone down in history as
Black Saturday has totally cancelled for posterity the relevance of all
previous data," Professor Pierotti says. "It has also done
incalculable damage to the tower. Professor Burland now holds the
distinction of being the fourth person in history to have made the same
howler of interfering with the cemented sunken path."
"Professor Burland has enormous potential since he now holds in his
hands the future of the two most famous bell-towers in the world. I just
hope for the sake of the good people of Britain that he doesn't do to your
Big Ben what he has managed to do to the Leaning Tower."
In the wake of a disconcerting chain of disasters to some of the country's
major monuments in Turin, Florence, Venice, Bari and Sicily, Mr Veltroni has
taken a refreshingly efficient managerial approach to the conservation and
exploitation of Italy's immense artistic patrimony.
The setting of firm deadlines will have been the key to getting Rome's
magnificent Borghese gallery open again. It has been fully restored after 14
years and is now able to show off its splendid Canova and Bernini sculptures
and paintings by Caravaggio, Raphael and Titian.
A properly restored Leaning Tower of Pisa would, for Mr Veltroni, be the
icing on the cake of other initiatives, such as the £40 million for
security to 1,000 museums and archaeological sites, the summer evening
opening to the public of 33 national museums, plus the improved facilities
in the Uffizi gallery in Florence.
Other recent successes include the European Commission's approval of the new
Raphael exchange project for the purpose of comparative studies of
restoration techniques, the new degree courses in cultural heritage
management at the University of Florence, and the attempted elimination of
complex laws that have hindered new initiatives.
Whether this first step towards a renaissance of Italian culture marks a
genuine change of attitude or is simply a short-term measure destined to end
with Italy's 55th post-war government, only time will tell.