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Page 28

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

and transport.

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

the operations.

Sennebogen

Russia

Crawler crane

as bridge

builder