Scissorsafe is a unique anchorage system designed to prevent falls from height when used as part of a fall arrest our work restraint system.
It is a planned safety system, anchor points are identified and voids formers are cast into the concrete by simply nailing them to the deck formwork, this eliminates the need to drill into concrete for anchorage.
Void formers become the anchorage point when the concrete has reached strength of 25kN/m3.
A Scissorsafe anchorage tool is inserted into the void and locked with a karabiner, which in turn connects the locked tool to fall arrest or work restraint components.
Scissorsafe anchorage tools will not allow connection until they are fully engaged and cannot move within the void former until the user removed the connector from it. There is no possibility of it self-releasing from the anchorage point.
Scissorsafe is tested to EN795 class B by Satra , notified body for testing and certification for CE marking of products under the European Unions Personal Protective Equipment directive.
The process checks that the product meets the appropriate safety and performance standards and that procedures are in place to ensure that the product is manufactured to consistent quality standards.
A Fall Arrest System provides freedom of movement for workers to conduct their duties, but in doing so it allows them to reach he point where a fall could occur. If this happens the fall will be arrested.
A Temporary Work Restraint System will restrict the workers movement within a safe working zone, preventing them from reaching the fall hard providing a high level of safety for workers when operating in areas with unprotected fall hazards and leading edges.
Scissorsafe Anchorage points for fall protection consists of two expendable parts, Fixing Disk and Tee Mould collectively termed Void Former because they form a shaped void in hardened concrete which allow the reusable anchorage tool to fit into.
They are usually fixed into horizontal formwork to pre-determined positions for fall arrest or work restraint.
Pendulum swing will occur in a fall event if the fallers fall arrest anchorage point is not located directly above his head.
At the outset of the fall, the faller will initially travel vertically until tensioning of the fall arrest system occurs. At this moment the faller will begin a swing fall which will subsequently bring him under the anchorage and beyond. The fall victim will collide with any objects that lie in his path.
A worker attached to an overhead anchorage device using a sale retracting lifeline device should operate in an arc no more that thirty degrees from vertical to avoid the risk of pendulum swing.
Before using or directing the use of the Anchorage Tool, it is important to inspect it carefully.
The device should be fully inspected by an expert within the last twelve months.
Scissorsafe Anchorage Tools are supplied with an Inspection card which informs the user or person with the duty of care what will determine if the component is usable or not.
These Inspection cards are available as a download from www.scissorsafe.co.uk
Examples of defects and damage
The following defects and damage have the potential to result in the degradation and/or weakening of the lanyard:
- cuts of 1 mm or more at the edges of webbing lanyards (eg where the lanyard may have been choke-hitched around steelwork);
- surface abrasion across the face of the webbing and at the webbing loops, particularly if localised;
- abrasion at the edges, particularly if localised;
- damage to stitching (eg cuts or abrasion);
- a knot in the lanyard, other than those intended by the manufacturer;
- chemical attack which can result in local weakening and softening – often indicated by flaking of the surface. There may also be a change to the colour of the fibres;
- heat or friction damage indicated by fibres with a glazed appearance which may feel harder than surrounding fibres;
- UV-degradation which is difficult to identify, particularly visually, but there may be some loss of colour (if dyed) and a powdery surface;
- partially deployed energy absorber (eg short pull-out of tear webbing);
- contamination (eg with dirt, grit, sand etc) which may result in internal or external abrasion;
- damaged or deformed fittings (eg karabiners, screwlink connectors, scaffold hooks);
- damage to the sheath and core of a kernmantel rope (eg rucking of the core detected during tactile inspection); internal damage to a cable-laid rope.
The Personal Protective Equipment Regulations 1992 (as amended) require employers to maintain fall arrest equipment in good repair, including appropriate replacement. In addition, the Work at Height Regulations 2005 require that equipment which is exposed to conditions causing deterioration which is liable to result in dangerous situations should be inspected at suitable intervals and each time exceptional circumstances which might jeopardise safety have occurred.
BS EN 365:2004 Personal protective equipment against falls from a height. General requirements for instructions for use, maintenance, periodic examination, repair, marking and packaging gives general requirements for periodic inspection, instructions for use and marking of PPE against falls from a height.
The British Standard states that components should be examined ‘at least twelve-monthly’. This is sometimes taken to be ‘annually’, although manufacturers of textile products usually recommend inspection more frequently than this.
It is essential that the person with responsibility for inspecting Fall Protection Equipment has specific training and genuine authority to discard fall protection components that are in this person’s opinion defective.
These checks should be tactile and visual, carried out each time the component is to be used. This is a visual check that should be undertaken in good light. Pass the component slowly through the hands to detect small cuts at the edges, softening or hardening of fibres, or ingress of contaminants
It is recommended that there is a detailed inspection at least every six months. For frequently used lanyards it is suggested that this is increased to at least every three months, particularly when the equipment is used in arduous environments
Detailed inspections should be recorded.
A shock load is created by using a test mass of 100kg free-falling from a specific height using a three-strand polyamide rope or EN 892 compliant dynamic rope lanyard.
A certain force is required to be held for a minimum of three minutes without failure (excluding type E anchors under EN 795:1996).
A sample is placed within a salt spray solution for a set period of time.