BS EN 81-43:2009 pdf free download – Safety rules for the construction and installation of lifts一 Special lifts for the transport of persons and goods Part 43: Lifts for cranes.
5.4.1.5 Attachments of drive elements (e.g. rack) to the mast shall ensure that the drive element is kept in correct position so that the stipulated loads can be transferred to the mast and that the fixings are ensured from coming loose.
5.4.2 Ties for mast and guide rails
The ties shall be so designed that they take care of the movements of the supporting structures (e.g. tower crane mast) and withstand the load cases according to 5.2. Special attention shall be paid to forces generated during erection and dismantling.
5.4.3 Buffers
5.4.3.1 The travel of the car shall be limited at the bottom of its travel by buffers.
5.4.3.2 With rated load in the car and at a speed equal to triggering speed of the overspeed safety device, the average retardation of the car during action of the buffers shall not exceed 1 g, with no peak exceeding 2,5 g for more than 0,04 seconds (consider rated load in the car plus inertia effects of the motors). (see 5.2.2.11)
5.4.3.3 If fitted, oil buffers shall be provided with a means for checking the oil level. An electrical safety switch shall monitor the stroke of the oil buffer so that the car cannot be driven by the normal operating means unless the buffer is in its normal extended position.
5.5 Liftway protection and landing access
5.5.1 General
A lift, when installed for use, shall have a protected liftway and protected landings.
These shall prevent persons from being struck by moving parts, and from falling from a height.
5.5.2 Liftway protection
5.5.2.1 Where the vertical distance between any part of the car, when resting on fully compressed buffers, and an accessible base level is less than 2,5 m, a lift base enclosure shall protect all sides to a height of at least 2,0 m and shall conform to 5.5.4 and EN ISO 13857:2008, Table 1.
5.5.2.2 When, e.g. for maintenance purposes, the base enclosure is accessed by the landing gate at base level, this shall be openable from the inside without a key or any tool.
5.5.2.3 In order to prevent falling from a height down the Iiftway guards shall be provided in accordance with EN 13586:2004+A1:2008, Table 7.
5.5.2.4 Where it is possible to reach into the Iiftway, the protection shall be in accordance with EN ISO 13857:2008 except for temporary lifts with a clearance greater than 0,5 m if the rated speed is not more than 0,4 rn/s
5.5.3 Landing access
5.5.3.1 When the lift is erected, it shall be provided with landing gates in the liftway protection at every point of entry including the base enclosure.
5.5.3.2 Landing gates shall not open towards the liftway.
5.5.3.3 The landing gates shall comply with the requirements in 5.5.4. Where the gate is made from imperforate material, the user shall be able to see that the car is at the landing. Requirements for indicators are given in EN 81-1:1998, Clause 7.6.2.
5.5.3.4 Horizontal and vertical sliding gates shall be guided, and their movement shall be limited by mechanical stops.
5.5.3.5 Vertical sliding gate panels shall be supported by at least two independent suspension elements. Flexible suspension elements shall possess a safety factor of at least 6 against their minimum breaking strength. Means shall be provided for retaining them in their pulleys or sprockets.