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Contractors World  -
2014 Vol 5 No 5
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Crawler crane as bridge builder


Crawler crane as bridge builder

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.

The crane was supplied by LLC Lonmadi 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.

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.


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