GBS

Guaranteed breaking strain.

GANTLINE

A fibre rope reeved through a single sheave block.

GANTRY CRANE

A powered crane with one or more bridge beams. The beams are supported at each end by legs mounted on traveling end carriages. They have a crab with one or more hoisting units that are able to travel across the bridge beam or beams. Used where there is no supporting building for the crane.

GEARED JACK

A geared mechanical device used to raise or lower loads.

GERMAN JACK

See geared jack.

GIN POLE

A guyed derrick without a pivoted strut-boom. It can raise and lower a load and a limited amount of slewing can be achieved by adjusting the guys.

GIN WHEEL

A purpose designed single sheave tackle block often used as a gantline during the erection and dismantling of scaffolds.

GIRDER CLAMP

An appliance designed to be fixed to the lower flange of a universal beam or RSJ to provide an anchorage for a sling, suspension rope, purchase or tackle.

GIRT

A horizontal structural member in a wall of a steel structure which supports the wall cladding sheets.

GOOSE NECK

See fly.

GUARANTEED BREAKING STRAIN

The load (or force) stated by the rope manufacturer as the rope’s breaking load when tested to failure in a new condition. The ratio between the GBS and the WLL is the factor of safety.

GRADE

Indicates the strength of chain, FSWR or other items manufactured from steel. The higher the grade of steel, the higher the tensile strength.

GROMMET

An endless sling constructed with a single rope strand layed up onto itself.

GUN TACKLE

A fibre rope tackle which uses an upper block with two sheaves and a lower block with two sheaves (two double blocks).

GUY

A tensioned rope fixed at one end to a mast, tower or structure and anchored some distance from the base to stabilise the structure.

GUYED DERRICK

A derrick (or derrick crane) stabilised by guys.

GYPSY

A sheave with pockets formed into its groove to take a load chain, such as on a chain block.