Side Loaders
Left hand lifting lug
Side loading machine

This ubiquitous method of lifting containers incorporates transverse mounted hydraulic arms integral with a lorry chassis. It uses a pair of two legged slings attached to the tip of lifting lifting arms whilst the free ends engage with container end corner fittings apertures with suitable lifting lugs, preferably self retaining types such as the Preston Shoe. The benefit being, that once coupled, they can confidently be relied upon on to remain in situe during a lift and not to fall free.

Sling geometry when End Lifting

End Lifting sling angle range for Series 1 Containers.

The sling geometry for single point end lifting is effective over an angle range between 68° and 72° typically at 70°.
The sling arrangement determines the head room and normally do not make contact with the end face of container but the top lifting point may be below top of high cube units and with some machines, may make contact with the top end region of container.

 
For the sling assembly, the vertical distance T from aperture center (For Preston Lugs) to top lifting point in terms of sling angle α is:
T = ( P/2) tan α
Clearance h between lifting point and top of container is:
h = T + 68 - H
Angle
T
8ft
8ft 6in
9ft 6in
α
mm
2.44m
2.6m
2.9m
68°
2869
431
279
-27
70°
3177
739
586
281
72°
3550
1112
959
654
Clearance h above top of container.
Negative values are below top.
Chain lengths not given because of range of ancilliary devices available.

Limiting Gross Weights when END lifting ISO containers

The limiting Gross Weight GW is determined from sling angle and Working Load Limits of 8.5 Ton or 12 Ton for these lugs. The GW must not be exceeded and these are shown here in general limiting lifting force diagrams for Side Lifting over the sling angle range 68° to 72°. Uniformly loaded containers give the maximum permissible Gross Weights. For eccentric loading the results give LOWER limiting GW values owing to additional sling forces at the" heavy end". The Gross Weights for the two loading cases of uniform and eccentric payloads are given below and must either equal or preferably exceed the MGW of unit being lifted.
Limiting Gross Weights when sling forces are at their WLL over sling angle range 68° to 72° for Uniformly Loaded Containers

Gross Weights when end lifting with lugs loaded to their WLL for uniform loading

Uniform loading. Level loading implicit

Sling angle range
Gross Weights
Central C of G
Angle
α
GW 8.5Ton
GW 12Ton
68°
31.52
44.50
70°
31.95
45.10
72°
32.34
45.65
Maximum GW over sling angle range
Gross Weights

Gross Weights when end lifting with lugs loaded to their WLL for offset loading

The Lifting Cycle describes the loading experienced during a lift, the nature of end lifting precludes an active "live load" component of any significance owing to hydraulic lifting system. When end lifting, the two arms normally operate independently enabling the container to be held level hence the problems of Tilt and Swing do not arise although any transverse eccentricity may result with lateral motion.

Eccentric Loading. Level lifting

Sling angle range
Gross Weights
Offset C of G
Angle
α
GW 8.5Ton
GW 12Ton
68°
28.66
40.50
70°
29.05
41.00
72°
29.40
41.50
Maximum GW over sling angle range
Gross Weights
When lifting eccentrically loaded containers the limiting Gross Weight is always lower than for uniform loading.