Concrete Chimney Demolition

The removal of 3no 60m steel flues from within the reinforced concrete windshield at the old Roche site in Welwyn Garden City was safely completed with the use of a 300 ton mobile crane.

The 3no flues were removed to facilitate the felling of the concrete windshield which was dismantled in a piece meal small fashion with all dismantled concrete falling to ground inside the chimney for retrieval at the base.

Churchills used their in-house crane capabilities utilising Crane Appointed persons and Competent Slinger banksman to complete this phase of the job

The demolition of the concrete windshield started week commencing 15th June using Churchills specialist demolition rig and concrete cutting methodology which has been employed to demolish 2975m of reinforced concrete chimneys with wall thicknesses ranging from 150mm to 400mm

The 60m reinforced concrete chimney at the old Roche site in Welywn Garden City was reduced by 40m in only 20 days, the base 20m will be demolished using a high reach machine.

The reinforced concrete wall with an average thickness of 200mm was demolished with total efficiency using Churchills tried and test concrete cutting methodology.

Photographs depicting the chimney prior to the installation of our demolition rig are shown below.

To view a list of similar contracts completed by Churchills please visit our web site and go to our Demolition & Dismantling page and click on the PDF download.

Power Station Chimney Re Lining Project

In December 2008 Churchills were appointed directly by e-on and mobilised to site to commence with the removal and replacement of 2no 110m tall brick flues housed within a 107m tall concrete windshield.

The removal of both brick linings was completed through the Christmas holidays to ensure a hand over date of March 2009 remained achievable.

During the removal of the brick linings the internal cast concrete ring beams that supported the internal brickwork at regular intervals throughout their height were found to have eroded beyond repair. Working with e-on engineers Churchills designed replacement ring beam supports to be installed in conjunction with the re bricking of both vertical flues.

Exposed to some of the coldest temperatures in recent years and now having to work night shifts through January, February and March to remain on programme Churchills installed internal access platforms to facilitate the re building of both flues and completed on time and within budget.