Anchor fixings to concrete structures are key components in many structures and may be part of safety critical systems. But how well are they understood? Fill out our survey for the chance to win an iPad Air.
In recent years the construction industry has identified potential problems with the selection and installation of fixings and taken steps to improve awareness of correct procedures.
The use of anchor fixings ranges from carefully planned and executed installations that are integral with the permanent works to one–off applications as a quick fix for an immediate problem. There is often an impression that chemical fixings or resins have magic properties and can be used in any circumstances to produce a permanent and strong bond for anchors or to replace missing rebar connections.
Records show that there have been many anchor failures, some resulting in fatalities including lining failures in the Boston Big Dig tunnel (2006), Japan’s Sasago tunnel (2012), and the Balcombe rail tunnel in the UK (2011) which was a near miss. CROSS (Confidential Reporting on Structural Safety) Newsletters have also published reports of a number of heavy ceiling failures in cinemas and other venues which could have caused tragedy.
Sudden, catastrophic, and progressive collapses have occurred where a single fixing has failed, sometime after many years, and the additional load thrown onto adjacent fixings causes them to fail in sequence.
The reasons for most problems are known and plenty of good advice is available on the selection, installation, and testing of new anchors. But concerns persist over industry awareness.
NCE is keen to establish some facts, and is conducting a brief survey to get a firm handle on the state of industry awareness. The results will be shared in NCE in July.