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After 8 years service during the bridge construction, two Linden Comansa

tower cranes had to be taken down. The Cadiz Bay Bridge is one of the major

infrastructures built in Spain in recent years and has been a challenge of

engineering.

T

wo Linden Comansa 21LC400 tower cranes have

been working for 8 years in the construction of

the Bridge of the 1812 Constitution, which con-

nects the city of Cadiz with the town of Puerto Real, in

Spain.

Popularly known as "Bridge of la Pepa", the project

has been an important social and economic benefit for

Cadiz, which until now had only two narrow and out-

dated routes out of the city and for crossing to the other

side of the bay.

With its imposing dimensions, this cable-stayed

bridge dominates the views from anywhere in the bay.

It has a total length of 3,092 metres, and its two main

pylons reach 185 metre high, leaving a main span of 540

metres between them, and holding the deck to a height

of 69 metres above sea level.

Belonging to the machinery fleet of construction

company, Dragados, the two Linden Comansa 21LC400

tower cranes worked from the two huge pylons, one of

them located on the edge of the bay at Puerto Real, and

the other in the middle of the sea.

The team of Eleva Grúas Torre, based in Seville, has

been in charge of the complicated assembly and dis-

mantling of the cranes, as well as of all the maintenance

works.

"The two cranes have reached a maximum

height of 195.6 metres. Strong wind gusts are

very common in the Bay of Cadiz, with much

greater strength at such height, which hampered

a lot all the tasks carried out by our team",

said Tomás Criado, Manager of Eleva Grúas Torre.

Crane Erection Extremely

Challenging

Erecting the two cranes was quite a chal-

lenge, especially the one situated in the mid-

dle of the bay.

A mobile crane on a pontoon barge helped

to assemble the crane with the minimum

height to install a hydraulic climbing cage:

14.2 metres under hook.

With this configuration, the Eleva Grúas Torre

team could start with the climbing works and

add the remaining ten sections to reach a

free-standing height 69.2 m.

From this initial height, the crane began work

on the construction of the pylon. As the pylon

was gaining in height, the crane was also

Spain

Challenging Dismantling Job For

Two Tower Cranes

Contractors World International

Contractors World International Vol 7 No 1

24