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7/28/2019 Eiffel Tower Project
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1.0 INTRODUCTION
The Eiffel Tower(French: La Tour Eiffel) is an iron lattice towerlocated on
the Champ de Mars in Paris, named after the engineerGustave Eiffel, whose company
designed and built the tower. The tower is erected in 1889 as the entrance arch to the 1889
World's Fair, it has become both a global cultural icon ofFrance and one of the most
recognizable structures in the world. The tower is the tallest structure in Paris and the most-
visited paid monument in the world. The third level observatory's upper platform is at 279.11
m the highest accessible to public in the European Union and the highest in Europe as long as
the platform of the Ostankino Tower, at 360 m, remains closed as a result of the fire of
August 2000.
The tower stands 320 metres (1,050 ft) tall, about the same height as an 81-storey
building. During its construction, the Eiffel Tower surpassed the Washington Monument to
assume the title of the tallest man-made structure in the world, a title it held for 41 years, until
the Chrysler Building in New York City was built in 1930. However, because of the addition,
in 1957, of the antenna atop the Eiffel Tower, it is now taller than the Chrysler Building. Not
including broadcast antennas, it is the second-tallest structure in France, after the Millau
Viaduct.
ALEXANDRE GUSTAVE EIFFEL
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Key Figures
Annual Visitors : almost 7 million, 75% of whom are foreigners
Tall : 324 metres (with its antennas)
Weight : 7,300 tonnes of metallic framework, and a total weight of 10,100 tonnes
Number Of Metallic Parts : 18,000 metallic parts joined by 2,500,000 rivets
Height Of Each Floor :1st floor: 57m; 2nd floor: 115m; 3rd floor: 276m
Lighting : 336 projectors (sodium lamps)Sparkling Lights : 20,000 bulbs (5,000 on each side) glitter for 5 minutes every hour on thehour, from nightfall until 1a.m.
Number Of Antennas : 120 antennas
Number Of Steps On The East Staircase Until The Top : 1,665 steps
Number Of Lifts : From the ground floor up to the 2nd floor: 5 (1 on the eastern pillar, 1 onthe western pillar, 1 on the northern pillar, 1 private lift on the southern pillar leading to the
"Jules Verne" restaurant, and 1 goods lift on the southern pillar). From the 2nd floor up to thetop: 2 sets of 2 Duo-lifts.
Kilometers Travelled By The Lift : The combined distance travelled of the lift cabins is103,000 km a year (2.5 times the circumference of the Earth).
Surface To Be Painted :250,000 m2 of surface to be painted during each painting campaign,every 7 years. 60 tonnes of paint are needed
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1.1 HISTORY
1.1.1 ORIGIN
The design of the Eiffel Tower was originated by Maurice Koechlin and mile
Nouguier, two senior engineers who worked for the Compagnie des Establissments Eiffel
after discussion about a suitable centrepiece for the proposed 1889 Exposition Universelle,
aWorld's Fairwhich would celebrate the centennial of the French Revolution. In May 1884
Koechlin, working at his home, he made an outline drawing of their scheme, described by
him as "a great pylon, consisting of four lattice girders standing apart at the base and coming
together at the top, joined together by metal trusses at regular intervals". Initially Eiffel
himself showed little enthusiasm, but he did sanction further study of the project, and the two
engineers then asked Stephen Sauvestre, the head of company's architectural department, to
contribute to the design. Sauvestre added decorative arches to the base, a glass pavilion to the
first level and other embellishments. This enhanced version gained Eiffel's support, and he
bought the rights to the patent on the design which Koechlin, Nougier and Sauvestre had
taken out, and the design was exhibited at the Exhibition of Decorative Arts in the autumn of
1884 under the company name. On 30 March 1885 Eiffel read a paper on the project to the
Socit des Inginieurs Civils: after discussing the technical problems and emphasising the
practical uses of the tower, he finished his talk by saying that the tower would symbolize.
"Not only the art of the modern engineer, but also the century of Industry and Science
in which we are living, and for which the way was prepared by the great scientific movement
of the eighteenth century and by the Revolution of 1789, to which this monument will be
built as an expression of France's gratitude."
Little happened until the beginning of 1886, when Jules Grvy was re-elected as
President and douard Lockroy was appointed as Minister for Trade. A budget for the
Exposition was passed and on 1 May Lockroy announced an alteration to the terms of the
open competition which was being held for a centerpiece for the exposition, which effectively
made the choice of Eiffel's design a foregone conclusion: all entries had to include a study for
a 300 m (980 ft) four-sided metal tower on the Champ de Mars. On 12 May a commission
was set up to examine Eiffel's scheme and its rivals and on 12 June it presented its decision,
which was that all the proposals except Eiffel's were either impractical or insufficiently
worked out. After some debate about the exact site for the tower, a contract was finally
signed on 8 January 1887. This was signed by Eiffel acting in his own capacity rather than as
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the representative of his company, and granted him one and a half million francs toward the
construction costs: less than a quarter of the estimated cost of six and a half million francs.
Eiffel was to receive all income from the commercial exploitation of the tower during the
exhibition and for the following twenty years. Eiffel later established a separate company to
manage the tower, putting up half the necessary capital himself.
First drawing of the Eiffel Tower by Maurice Koechlin
1.2 THE "ARTISTS PROTEST"
The projected tower had been a subject of some controversy, attracting criticism both
from those who did not believe that it was feasible and also from those who objected on
artistic grounds. Their objections were an expression of a longstanding debate about
relationship between architecture and engineering. This came to a head as work began at theChamp de Mars: A "Committee of Three Hundred" (one member for each metre of the
tower's height) was formed, led by the prominent architect Charles Garnier and including
some of the most important figures of the French arts establishment, including Adolphe
Bouguereau, Guy de Maupassant, Charles Gounod and Jules Massenet: a petition was sent to
Charles Alphand, the Minister of Works and Commissioner for the Exposition, and was
published byLe Temps.
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"We, writers, painters, sculptors, architects and passionate devotees of the hitherto
untouched beauty of Paris, protest with all our strength, with all our indignation in the name
of slighted French taste, against the erectionof this useless and monstrous Eiffel Tower. To
bring our arguments home, imagine for a moment a giddy, ridiculous tower dominating Paris
like a gigantic black smokestack, crushing under its barbaric bulkNotre Dame, the Tour
Saint-Jacques, the Louvre, the Dome of les Invalides, the Arc de Triomphe, all of our
humiliated monuments will disappear in this ghastly dream. And for twenty years, we shall
see stretching like a blot of ink the hateful shadow of the hateful column of bolted sheet
metal".
Gustave Eiffel responded to these criticisms by comparing his tower to the Egyptian
Pyramids : "My tower will be the tallest edifice ever erected by man. Will it not also be
grandiose in its way? And why would something admirable in Egypt become hideous and
ridiculous in Paris ?"These criticisms were also masterfully dealt with by douard Lockroy
in a letter of support written to Alphand, ironically saying "Judging by the stately swell of the
rhythms, the beauty of the metaphors, the elegance of its delicate and precise style, one can
tell that this protest is the result of collaboration of the most famous writers and poets of
our time", and going on to point out that the protest was irrelevant since the project had been
decided upon months before and was already under construction. Indeed, Garnier had been amember of the Tower Commission that had assessed the various proposals, and had raised no
objection. Eiffel was similarly unworried, pointing out to a journalist that it was premature to
judge the effect of the tower solely on the basis of the drawings, that the Champ de Mars was
distant enough from the monuments mentioned in the protest for there to be little risk of the
tower overwhelming them, and putting the aesthetic argument for the Tower: "Do not the
laws of natural forces always conform to the secret laws of harmony?"
Some of the protestors were to change their minds when the tower was built: others
remained unconvinced. Guy de Maupassant supposedly ate lunch in the Tower's restaurant
every day. When asked why, he answered that it was the one place in Paris where one could
not see the structure. Today, the Tower is widely considered to be a striking piece of
structural art.
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1.3 CONSTRUCTION
Work on the foundations started in January 1887. Those for the east and south legs
were straightforward, each leg resting on four 2 m (6.6 ft) concrete slabs, one for each of theprincipal girders of each leg but the other two, being closer to the riverSeine were more
complicated: each slab needed two piles installed by using compressed-air caissons 15 m
(49 ft) long and 6 m (20 ft) in diameter driven to a depth of 22 m (72 ft) to support the
concrete slabs, which were 6 m (20 ft) thick. Each of these slabs supported a block built of
limestone each with an inclined top to bear a supporting shoe for the ironwork. Each shoe
was anchored into the stonework by a pair of bolts 10 cm (4 in) in diameter and 7.5 m (25 ft)
long. The foundations were complete by 30 June and the erection of the ironwork began. Thevery visible work on-site was complemented by the enormous amount of exacting
preparatory work that was entailed: the drawing office produced 1,700 general drawings and
3,629 detailed drawings of the 18,038 different parts needed. The task of drawing the
components was complicated by the complex angles involved in the design and the degree of
precision required: the position of rivet holes was specified to within 0.1 mm (0.04 in) and
angles worked out to one second of arc. The finished components, some already riveted
together into sub-assemblies, arrived on horse-drawn carts from the factory in the nearbyParisian suburb ofLevallois-Perret and were first bolted together, the bolts being replaced by
rivets as construction progressed. No drilling or shaping was done on site: if any part did not
fit it was sent back to the factory for alteration. In all there were 18,038 pieces of puddle iron
using two and a half million rivets.
At first the legs were constructed as cantileversbut about halfway to the first level
construction was paused in order to construct a substantial timberscaffold. This caused a
renewal of the concerns about the structural soundness of the project, and sensationalheadlines such as "Eiffel Suicide!" and "Gustave Eiffel has gone mad: he has been confined
in an Asylum" appeared in the popular press. At this stage a small "creeper" crane was
installed in each leg, designed to move up the tower as construction progressed and making
use of the guides for the lifts which were to be fitted in each leg. The critical stage of joining
the four legs at the first level was complete by March 1888. Although the metalwork had
been prepared with the utmost precision, provision had been made to carry out small
adjustments in order to precisely align the legs: hydraulic jacks were fitted to the shoes at the
base of each leg, each capable of exerting a force of 800 tonnes, and in addition the legs had
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been intentionally constructed at a slightly steeper angle than necessary, being supported
by sandboxes on the scaffold.
No more than three hundred workers were employed on site, and because Eiffel took
safety precautions, including the use of movable staging, guard-rails and screens, only oneman died during construction.
The construction of the Eiffel Tower foundation
Eiffel Tower Under Construction Between 1887 And 1889
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1.4 INAUGURATION AND THE 1889 EXPOSITION
The main structural work was completed at the end of March 1889 and on the 31st
Eiffel celebrated this by leading a group of government officials, accompanied by
representatives of the press, to the top of the tower. Since the lifts were not yet in operation,
the ascent was made by foot, and took over an hour, Eiffel frequently stopping to make
explanations of various features. Most of the party chose to stop at the lower levels, but a
few, including Nouguier, Compagnon, the President of the City Council and reporters from
Le FigaroandLe Monde Illustrcompleted the climb. At 2.35 Eiffel hoisted a large tricolore,
to the accompaniment of a 25-gun salute fired from the lower level. There was still work to
be done, particularly on the lifts and the fitting out of the facilities for visitors, and the tower
was not opened to the public until nine days after the opening of the Exposition on 6 May,
and even then the lifts had not been completed.
The tower was an immediate success with the public, and lengthy queues formed to
make the ascent. Tickets cost 2 francs for the first level, 3 for the second and 5 for the top,
with half-price admission on Sundays, and by the end of the exhibition there had been nearly
two million visitors.
Eiffel had a permit for the tower to stand for 20 years; it was to be dismantled in
1909, when its ownership would revert to the City of Paris. The City had planned to tear it
down (part of the original contest rules for designing a tower was that it could be easily
demolished) but as the tower proved valuable for communication purposes, it was allowed to
remain after the expiry of the permit. In the opening weeks of the First World War, powerful
radio transmitters were fitted to the tower in order to jam German communications. This
seriously hindered their advance on Paris, and contributed to the Allied victory at the First
Battle of the Marne.
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1.5 DESIGN OF THE TOWER
1.5.1 MATERIAL
The Eiffel Tower From Below
The puddle iron structure of the Eiffel Tower weighs 7,300 tonnes, while the entire
structure, including non-metal components, is approximately 10,000 tonnes. As a
demonstration of the economy of design, if the 7,300 tonnes of the metal structure were
melted down it would fill the 125-metre-square base to a depth of only 6 cm (2.36 in),
assuming the density of the metal to be 7.8 tonnes per cubic metre. Depending on the ambient
temperature, the top of the tower may shift away from the sun by up to 18 cm (7.1 in)
because of thermal expansion of the metal on the side facing the sun.
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1.5.2 WIND CONSIDERATIONS
At the time the tower was built many people were shocked by its daring shape. Eiffel
was criticised for the design and accused of trying to create something artistic, or inartisticaccording to the viewer, without regard to engineering. Eiffel and his engineers, however, as
experienced bridge builders, understood the importance of wind forces and knew that if they
were going to build the tallest structure in the world they had to be certain it would withstand
the wind. In an interview reported in the newspaperLe Temps, Eiffel said:
Now to what phenomenon did I give primary concern in designing the Tower? It was
wind resistance. Well then! I hold that the curvature of the monument's four outer edges,
which is as mathematical calculation dictated it should be [] will give a great impression of
strength and beauty, for it will reveal to the eyes of the observer the boldness of the design as
a whole.
Researchers have found that Eiffel used empirical and graphical methods accounting
for the effects of wind rather than a specific mathematical formula. Careful examination of
the tower shows a basically exponential shape; actually two different exponentials, the lower
section overdesigned to ensure resistance to wind forces. Several mathematical explanationshave been proposed over the years for the success of the design; the most recent is described
as a nonlinear integral equation based on counterbalancing the wind pressure on any point on
the tower with the tension between the construction elements at that point. As a
demonstration of the tower's effectiveness in wind resistance, it sways only 67 cm (23 in)
in the wind.3
1.5.3 ACCOMMODATION
When built, the first level contained two restaurants: an "Anglo-American Bar", and a
250 seat theatre. A 2.6 m (8 ft 6 in) promenade ran around the outside.
On the second level, the French newspaperLe Figaro had an office and a printing
press, where a special souvenir edition,Le Figaro de la Tour, was produced. There was also a
ptisserie.
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On the third level were laboratories for various experiments and a small apartment reserved
forGustave Eiffel to entertain guests. This is now open to the public, complete with period
decorations and lifelike models of Gustave and some guests.
1.5.4 ENGRAVED NAMES
Gustave Eiffel engraved on the tower seventy-two names of French scientists,
engineers and other notable people. This engraving was painted over at the beginning of the
twentieth century but restored in 19861987 by the Socit Nouvelle d'exploitation de la Tour
Eiffel, a company contracted to operate business related to the Tower.
1.5.5 MAINTENANCE
Maintenance of the tower includes applying 50 to 60 tonnes of paint every seven
years to protect it from rust. The height of the Eiffel Tower varies by 15 cm due to
temperature.
1.5.6 AESTHETIC CONSIDERATIONS
In order to enhance the impression of height, three separate colours of paint are used
on the tower, with the darkest on the bottom and the lightest at the top. On occasion the
colour of the paint is changed; the tower is currently painted a shade of bronze. On the first
floor there are interactive consoles hosting a poll for the colour to use for a future session of
painting.
The only non-structural elements are the four decorative grillwork arches, added in
Stephen Sauvestre's sketches, which served to reassure visitors that the structure was safe,
and to frame views of other nearby architecture.
One of the great Hollywood movie clichs is that the view from a Parisian window
always includes the tower. In reality, since zoning restrictions limit the height of most
buildings in Paris to 7 storeys, only a very few of the taller buildings have a clear view of the
tower.
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2.1 NEW TECHNOLOGY
2.1.1 VARIABLE MATERIALS
An expert on the characteristics of various metals by this point in his career, Eiffel
had decided that wrought iron was the only available material that would provide the
necessary combination of strength, flexibility, durability and affordability to make his
design a reality.
Wrought iron is an iron alloy with a very low carbon content in contrast to steel, and
has fibrous inclusions, known as slag. This is what gives it a "grain" resembling wood,which is visible when it is etched or bent to the point of failure. Wrought iron is tough,
malleable, ductile and easily welded
The Eiffel tower is constructed from puddle iron, a form of wrought iron. This
resulted in puddle iron, which contained less slag, sulfur and had a very low carbon
content. The iron was kept separate from the fire in a reverberatory furnace to prevent
harmful sulphur and phosphorus from entering the finished iron. Puddle iron, although
also variable in its properties, was generally more consistent than the earlier irons, and the
method lent itself to the production of far greater quantities
2.1.2 INSTALLING RIVERSIDE FOUNDATIONS
The construction process was infused with Eiffel's exceptional innovation from thevery beginning. To install the riverside foundations, Eiffel used injected compressed air
and watertight, metal caissons, which are generally used in underwater construction. The
workers could climb down into a caisson, which was like an underground room, and work
below the level of the Seine, using pickaxes to break up the soil that the caisson itself had
loosened. As they removed the soil, the 34-ton caissons would sink deeper and break up
more soil and rocks for the workers to remove.
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Once the digging was complete, the workmen poured 20 feet of quick-drying cement
into each hole to provide a base for the foundation piers. The cement was topped with
massive blocks of limestone, which were then capped by two layers of cut stone from theChteau Landon quarry.
Examples of Construction Process Riverside Foundations.
Metal caissons
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3.1 PROBLEMS HAPPEN IN CONSTRUCTION
1. The difficulty lies in the departure point of collection in the bass the truss frame. So,as a solution to the problem they had to put in an oblique angle so that they will meet
in the first floor of a horizontal beam. To achieve this, engineers use hydraulic jacks
to move each "leg" and erected scaffolding system origin.
2. Problem also happen when lack of technology make it difficult to carry a materialfrom one level to another level. Eiffel had to adjust his building method once again.
He has to use a steam powered winch. This machine would lift up materials place in
it by hooks and ropes from the ground to the first level.
Picture of Steam Powered Machine
3. Among the barriers faced by Eiffel is, at first, the lack of funds. French government atthe time was only provides very limited funding for the construction of the tower
while the cost is high. Eiffel himself had to use his money and find funds in other
ways.
4. There was also the question of how to bring people up to the top of the Eiffel tower inan efficient (meaning without using the stairs). Design a bend foot tower has raised a
challenge to the builders lift at the time. No one dares to make recommendations and
take the tender to build the tower elevators. During the announcement of the
construction tender made lifts (lifts from the bottom to the first platform), is a
company that has responded. Otis Elevator Company, of America.
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4.1 CONCLUSION
In a nutshell, Eiffel tower is the tallest tower in the world in 1889. Although in the
beginning of the tower construction had to face many problem and criticism such as peopleand community of France engineers arguing about the function of this tower, however,
Gustave Eiffel believe that in the future Eiffel tower will be an icon to the world and a
popular attraction for visitors in Paris. This tower has an elements of art and a symbol of
science and technology. For example, experiment about physics and meteorology can be done
at here. Furthermore, Eiffel are bravely to take a risk when he decide to built this tower by
using steel. The applied of steel in high tower building are not guaranteed about their stiffness
because it will accommodate a lots of load and pressure. On this time, Gustave Eiffel wasfamous because have created its own formula about the strength, durability and factors
affecting of iron and steel. By using the formula and calculating of maths, he began the of
work construction, despite he faces many criticisms from the public and media. At last, the
construction of Eiffel Tower are succeed and be an icon to the Paris, France.
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5.0 REFERENCES
http://en.wikipedia.org/wiki/Eiffel_Tower http://paris-eiffel-tower-news.com/eiffel-tower-stories/eiffel-tower-construction.htm
http://en.wikipedia.org/wiki/Eiffel_Towerhttp://en.wikipedia.org/wiki/Eiffel_Towerhttp://paris-eiffel-tower-news.com/eiffel-tower-stories/eiffel-tower-construction.htmhttp://paris-eiffel-tower-news.com/eiffel-tower-stories/eiffel-tower-construction.htmhttp://paris-eiffel-tower-news.com/eiffel-tower-stories/eiffel-tower-construction.htmhttp://en.wikipedia.org/wiki/Eiffel_Tower