Contractors World International Vol 5 No 5
Since the end of 2013, the Russian construction
company BaltMostStroy has been using a
Sennebogen7700 crawler crane to build bridges along
a new freeway route. The 300 t crawler crane lifts
prefabricated parts weighing as much as 100 t onto
the concrete pier heads.
Thecranewas suppliedby LLCLonmadi Saint Petersburg,
the Russian Sales and Service Partner.
BaltMostTroy uses the flexible crawler crane for its
demanding infrastructure construction works in Russia.
Currently the machine is working on construction of a
bridge 800 m in length that is part of the new motorway
A121 between St. Petersburg and Priosersk-Sortavala.
Equipped with a 41 m boom and auxiliary jib, the 300
t crane lifts steel elements onto the concreted bridge
abutments. This requires the utmost precision and is
extremely time-intensive, because the machine must be
perfectly aligned in order to securely place the chains and
straps. The actual lifting only takes a few minutes.
There are 10 additional bridges on which the beams
must be installed in this manner along the route. The hilly
terrain and extreme inclines are no problem for the crane.
The machine must lift parts weighing many tons
perfectly horizontal, and position them with millimeter
precision. A difficult task for operator and machine, made
possible by the sensitive controls of the 7700.
The Sennebogen 7700 is equipped with an 8 m wide
crawler undercarriage and ballast of 135 t, which gives the
machine the necessary stability.
A powerful 313 kW Caterpillar diesel engine drives the
two 220 kN winches.
CEO Arkadij Borisov, who experienced the performance
capability of the machine on site, was very impressed. In
particular the possibility of moving the crane under load is
considered a welcome work facilitation.
The compact uppercarriage of the 7700, with a
transport width of 3 m, is the largest component which
makes the crane easy to manoeuver
The maximum 2.43 m width
of all the boom sections, as well
as the Starlifter undercarriage,
make transportation easy, even in
a container. The booms can be set
up in just a few steps thanks to the
innovative self-assembly system.
For the driver, the Maxcab
comfort cabin, which can be inclined
20 degrees, offers an optimal view of