Temporary Works covers everything, and anything, not shown on the permanent works drawings but needed by a contractor to construct or complete a project. To be able to achieve this, a contractor needs to do many different things which could include installing cranes, manoeuvring plant on and off site, or erecting scaffolding. All these additional elements must be carried out safely but none are planned, or thought about, for the permanent works. Therefore if, for example, a project required a 1000 tonne crane to lift in beams, temporary works would be needed to design a crane base for it to safely sit on whilst in use.
Permits to dismantle are included in the design, these include access and removal of the original support, which might consist of extremely large piles and very heavy kit. Your temporary works drawings and method of work are, in effect, a guide from installation to the dismantling of anything not included in the permanent drawings.
Temporary Works became increasingly formalised in the 1970s, after the publication of the Bragg report in 1975. This recorded fatal falsework disasters and were included in the CDM (Construction Design and Maintenance Regulations and BS 5975). However, even today, contractors need to be more aware that temporary works are crucial for method statements and methods of construction. They may have ‘done it like this before’ but it might not have met the safety requirements. Temporary works are there to ensure the whole process of construction is possible and, more importantly, safe.