During the installation of chimney flues, single and multi-strand hydraulic jacks are often used. These jacks are usually anchored to the roof of the chimney and the strands extended down to the floor inside the chimney to pick up the first section of the flue.

This section is lifted and the second section is then pushed in to the breech of the chimney, bolted onto the underside of the first section then the two sections are lifted together. This method is continued until all of the flue sections have been bolted together and the jacks on the roof support the complete flue. The flue is then secured to the roof steelwork and the jacks released.

Bierrum owns its own strand jacks and maintains qualified jacking operators on site to carry out these lifting operations