An anchorage device (AD) is a system which is specially designed to protect individuals from falling and consists of at least one anchorage point. Anchorage devices are often permanently installed on a building (e.g. flat roof, pitched roof, facade etc.) or connected to a respective substructure (e.g. machine, crane way, wind energy turbine etc.). The users can connect up their personal protective equipment (PPE), e.g. connectors or retaining cables, to these anchors. These anchor systems may be designed as a preventative retention measure to prevent a fall from occurring or as an arresting system aimed at protecting the user from the fatal impact of a fall.
As described in DGUV Publication No. 201-056, entitled “Basic planning guidelines for anchor devices on roofs”, an AD may also be based on several and/or movable anchorage points. This information booklet distinguishes between two types of anchor system:
In regulation EN 795, which is mandatory for the German market, a distinction is made between five different types of anchorage device.
In the prevention guidelines likewise published by the DGUV, entitled “Conducting expert inspections for anchor devices”, it is also stated that ADs may be permanently fixed to the subsurface but that they may also be installed on a temporary basis, e.g. in the case of deployment for a restricted period of time. Roof safety hooks that are permanently installed on a pitched roof surface are also regarded as anchorage devices in the above guidelines, despite the fact that they are subject to EN 517 and not included in EN 795.
To secure longer stretches and/or larger areas, the guidelines advise against the usage of single anchorage points to avoid the danger of a swing fall. In this case, the recommendation is to install a fall arrest solution parallel to the falling edge, such as a lifeline system.
As opposed to technical anchorage devices, the preventative guidelines also describe a range of alternative anchorage options. These include, for example, load-bearing pipes, posts or girders that can be used temporarily to attach PPE.