BELOW THE HOOK Ӏ NOVEMBER 2022


Hooked, line and sinker


All kinds of devices can hang between the hook of a crane and its load, and they can perform all sorts of functions. Juian Champkin reports.


At the simplest, below-the-hook devices can merely be the right shape or have the right mechanism to secure an awkwardly-shaped load that has no visible point of support – a coil hook, an electromagnet, a suction pad... Go further, and they can perform more functions – compensating the load against wind shear, or for wave action on a ship-board crane in heavy seas. Richard Phillips of Casper,


Phillips and Associates gives a low-down on one approach to below-the-hook engineering – see box on page 128.


Another application that


is attracting interest is load stabilisation – that is, stopping a dangling load from spinning in the wind. It is a relatively new technology or rather group of technologies. Its prime application is on construction sites where tower cranes are lifting on long falls and the load needs to be set down in a precise orientation. The traditional method to


achieve this has been to use ground crews pulling on tagline ropes to turn the load to its required position. This is inconvenient and dangerous: people straining near the set-down site to control a heavy and unruly load in a high wind is extremely undesirable. Devices to control load


f A Roborigger on a (conventional) crane CRANES TODAY 127


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