A growing use for Helifix masonry reinforcement systems is to stabilise existing buildings during a new construction phase or a significant restoration, enabling major structural works to be undertaken safely and cost-effectively. Some of the more common requirements are: to allow the removal and replacement of significant structural elements;\u00a0to reinforce against heavy drilling or piling vibrations; to enable the creation of new openings and reduce the loadings on other elements; to open up work space by reducing or eliminating the need for traditional temporary mechanical props; to reinforce party walls during demolition and development of neighbouring properties.<\/p>\n
A recent project in Williamson Square, Liverpool, is a good example of the last application.<\/p>\n
A number of dilapidated Victorian three storey buildings were to be demolished to make way for some new retail units. However, a laser survey showed that the adjacent concrete frame building, constructed in the 1970\u2019s, had been built into the gable end wall of the properties to be demolished, with the two adjacent 9\u201d walls in effect creating a solid party wall which had to be tied together and retained.<\/p>\n
The project engineers asked Helifix to design a suitable structural solution and a scheme was devised using grouted CemTies and SockFix grouted sock anchors. Over 1,000 8mm stainless steel CemTies of varying lengths, bonded with HeliBond cementitious grout, were installed in a 450mm x 450mm staggered formation to tie together the two adjacent gable end walls.<\/p>\n
Some 60 SockFix grouted anchors, 1,500mm long, were then installed at 600mm horizontal centres into the hollow concrete floor slab of the adjacent building at each floor level. These secured the retained gable wall to the main structure of the existing adjacent building. The Helifix ties and anchors provided a fast, efficient and economical solution and, with the wall fully secured, the main contractor was able to proceed with the demolition without any major contract delays.<\/p>\n