Safety net
A fall-arrest network (also known as protective net or only as a safety net referred to) is a network , which as a protective device in the event of a crash is provided by people. It serves to catch the falling person.
Personal safety nets are occupational safety equipment and are used in various areas, including on construction sites and for "flying air numbers " in circus companies . For the construction sector, the trade association for the construction industry has drawn up the BGR 179 rule, which must be met so that a net can serve as fall protection.
Personal safety nets are referred to as “secondary fall protection”, which means that, unlike primary fall protection, they do not prevent falls, but only alleviate the consequences. It is therefore required to use personal safety nets only if primary fall protection such as covers, barriers and boundaries cannot be used for technical reasons. Personal safety nets are mounted horizontally. The standard-compliant designation for a horizontally stretched safety net with edge rope is "Safety net EN 1263-1 System S".
Within this category, depending on the minimum fracture energy, another 4 network classes are distinguished, which must meet the following requirements:
- Network class A1: 2.3 kJ minimum breaking energy, 60 mm maximum mesh size
- Network class A2: 2.3 kJ minimum breaking energy, 100 mm maximum mesh size
- Network class B1 4.4 kJ minimum breaking energy, 60 mm maximum mesh size
- Network class B2 4.4 kJ minimum breaking energy, 100 mm maximum mesh size
Personal safety nets are usually made of plastic yarn as suitable ones are more elastic than natural fiber yarns.
In 2016, the American skydiving instructor Luke Aikins realized for the first time a free fall from a height of 7.6 km into a safety net, which was only guided and air-braked with the body . As planned, he landed lightly on his back after rotating his body at about 192 km / h.
When a person is caught by a net, their mesh loops are stretched, the thread of the net material is stretched, the threads rub against each other at connection points and the surface of the net is pulled (across and lengthways) through air or water, which also uses up energy. In contrast to a tautly stretched trampoline, a safety net is supposed to consume expected impulses already in a half oscillation to such an extent that a person does not take off again after landing.
See also
- vertically mounted side protection net (primary fall protection)
- Working platform network
Individual evidence
- ↑ a b Ricken, Viktor: Safety nets / safety nets . In: The scaffold builder . No. 1 , 2009 ( baufachinformation.de [accessed on March 19, 2010] summary).
- ↑ Archived copy ( Memento of the original from March 13, 2011 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Website of the Austrian Labor Inspectorate
- ↑ a b c Archived copy ( memento of the original from November 20, 2010 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Rule BGR 179 of the professional association for the construction industry entitled "Use of protective nets"
- ↑ http://www.arbeitssicherheit.de/arbeitssicherheit/html/modules/bgvc/bgv_c/c2.pdf ( page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. Accident prevention regulations of the trade association for showmen and circus companies BGV C2, see Section 9, Paragraph 4
- ↑ http://www.arbeit-und-gesundheit.de/files/281/bau_br.pdf Brochure "Safe working in construction" from the Austrian Federal Ministry for Economics and Labor , see pages 13 and 14 there
- ↑ http://e-pub.uni-weimar.de/volltexte/2007/885/pdf/AS-Tagg-1999-05.pdf Dipl.-Ing. Wolfgang Seifer, Bau-Berufsgenossenschaft Frankfurt / M., "Fall accidents - is it really not possible without them?", In: Proceedings for the 1st conference on safety on construction sites (1999), p. 48.
- ↑ Net classes of a personal safety net
- ↑ Archived copy ( Memento of the original from May 14, 2012 in the Internet Archive ) Info: The archive link was inserted automatically and has not yet been checked. Please check the original and archive link according to the instructions and then remove this notice. Summary of project no. BIA6011 "Load tests on aged safety nets" by the Institute for Occupational Safety and Health of the DGUV (IFA) in Sankt Augustin. No longer available on February 27, 2017.
- ↑ Skydiver becomes first to freefall into net without parachute dw.com, July 31, 2016, accessed February 27, 2017.
