To improve the prevention of falls from a height in the building sector, we briefly present a technical seminar on the topic of works at a height organized on 15 January 2015 in Rome by the Safety Commission in temporary and mobile construction sites set up at the Order of Engineers of the Province of Rome , in collaboration with ISOPAN SPA
In the seminar, entitled ” Work on skylights, roofs and roofs. Analysis of the art. 148 – Legislative Decree 81/08 Special works “, the topic of falls prevention, of the obligations related to work on roofs and skylights, with reference also to Article 148 of the Consolidated Law , was discussed .
We will briefly discuss the proceedings of the seminar – published on the Order’s website – which deal with various aspects of the design of security on the roofing :
– coverage of workplaces – access ;
– structural types of coverings ;
– design criteria ;
– example of security .
Referring to a complete reading of the slides related to the proceedings of the seminar, full of explanatory images, we focus on the issue of access to coverage with reference to the content of the technical coverage , a document containing design information, technical requirements, certifications of conformity and other information for the prevention of risks of falling from a height.
The document focuses on various types of access and emphasizes that “the use of a ladder as a workstation is allowed only in cases where the use of other safer equipment is not justified due to the limited level of risk and the short duration of use or particular characteristics of the sites that can not be changed “.
Various measures are presented for possible access with stairs .
– “the ladder must rest on a stable, resistant support of adequate dimensions;
– avoid sliding the ladder by fixing one end or using non-slip feet or other equivalent solutions;
– if the staircase is used to access a threshold, it must protrude by at least one meter;
– use the ladder in such a way as to always have a secure grip, even when carrying loads “;
– “before going up, fix the safety devices that some stairs have;
– fixing a ladder at one of its ends is always a good rule “.
Information is then provided on particular types of access, such as access with fixed ladders with guards : “it is not mandatory to be bound during the progression, but the cage does not adequately protect in the event of a fall”.
Regarding the design criteria, the slides focus on different elements: from the worker’s restraint to the elasticity of the rope, from the waist line to the pendulum effect, from the installation height to the air tie, …
Recall that the pendulum effect is constituted by the “uncontrollable and uncontrollable oscillatory movement that a body connected by a flexible system (rope or cable) to an anchor can suffer as a result of a fall”. And it is “the greater the greater the possibility of lateral oscillation. It stops when the body reaches its own equilibrium. The worst condition occurs near the corners of the roof “.
In particular, the pendulum effect can expose the worker “to the risk of violent collision against lateral obstacles”. It is also essential “to pay particular attention to the positioning of the anchors so as to eliminate or reduce this effect and thus avoid the operator to hit obstacles or impacts on the ground”.
Finally we focus on some aspects of the example of security proposed in the slides.
The safety procedure starts with an inspection .
The visit must identify:
– “survey of the roof (indicating skylights, openings, tanks, plants and what is present);
– survey under cover (indicating systems, free heights, bridge cranes machinery, etc.);
– survey of the supporting structure and stratigraphy of the roof “.