This news article was originally written in Spanish. It has been automatically translated for your convenience. Reasonable efforts have been made to provide an accurate translation, however, no automated translation is perfect nor is it intended to replace a human translator. The original article in Spanish can be viewed at Implementos hidráulicos para demoler un puente sin interrupciones

Atlas Copco provides its solutions to the work in the German town of Lorch

Hydraulic implements to demolish a bridge without interruption

Drafting Interempresas06/04/2011

on April 6, 2011

Within the framework of the renewal of the connection of the national highway 297 with National Highway 29 in Lorch (Germany), the company FWA Fischer Weilheim Abbruch GmbH & Co. KG was commissioned to demolish the old bridge on the B29 B297 of the Presidency of the Government in Stuttgart. The two sections of prestressed reinforced concrete bridge had a mass of 3 000 tonnes. The demolition was essential to avoid damage to the national highway which was completely closed to traffic. To this end were used hydraulic implements Atlas Copco.

The difficulty in this demolition was that the structure of the bridge, as well as having a longitudinal and transverse, slope was curved in a range of 280 metres in the horizontal. In addition, slightly shifted, 15 metres below the bridge, there was a step for neighborhood traffic that should be kept always accessible for the entry of rescue vehicles.

Due to these constraints, it was necessary to create a static concept in which were specific in detail every step of the demolition. The concept should ensure the static stability during the demolition, as well as prevent any danger to people, machines and the environment at all times.

The excavators were equipped with a total of five hydraulic hammers Atlas Copco. HB-3000, 4200 HB and HB 7000 models.

First of all had to perform a total closing, followed by disassembly of the guardrails. He then proceeded to protect the B29 highway through a recoge-escombros made of recyclable material. Finally, the fleet of Caterpillar machines a wheeled excavator and five bulldozers crawler, equipped with hydraulic hammers and devastating JAWS Atlas Copco, began with the demolition of the bridge. A total of five hydraulic breakers of the models HB 3000, 4200 HB and HB 7000, supported by devastating JAWS CC 3300 U, S 3300 CC and CC 6000 U models have been used.

Master beams

While the two 3000 HB felled by above the deck of the bridge of 30 cm thick, the two devastating JAWS CC 3300 U, as well as the crushing clamp CC 6000 U were in charge of the demolition of the marginal beams. Then destroyed the master beams with a section of four square metres of concrete with two hydraulic hammers 4200 HB and HB 7000. The crushing clamp CC 3300 S, did shatter prestressed longitudinal armor so that it cupiese in containers placed in such a way that he could retire immediately, once filled with.

Caterpillar also participated in operation bringing a wheeled excavator and five crawler excavators

Once finished the first stage, the crushing clamp CC 6000 U was able to display his massive strength and width of mouth of 1,400 mm to demolish the contrasoporte. Thanks to the use of this large crushing grip, responsible for enterprise could topple without much effort strong external walls of a meter in width and its consequent armor. He then returned to use the 7 ton hydraulic hammer that toppled completely, in a minimum time, the contrasoporte. When they concluded the work of demolition, the concrete was and broke ground on the site itself, being available to return to form part of a new road and thus protect the environment.