The usefulness of the Hume L-Shape Units is enhanced by its versatility. They may be used as:

• Retaining Walls 

• Temporary or Permanent Storage Walls 

• Open Drains

Precast L-Shape Units have the following advantages over cast in-situ structures: 

• Easily assembled or dismantled for service elsewhere 

• Reliable factory cast concrete

• Temporary storage where permanent storage not required or impractical 

• Increase storage capacity 

• Maintenance eliminated 

• Can be off loaded from transport and erected in one operation 

• Assembly or dismantling can be attended to by unskilled labour

• Precast design is in accordance with BS 8110 based on the following types of loading condition: 

Type 1.

MOT HA loading at 1.22 m behind the wall (open drain) 

Type 2.

Surcharge of 610 mm maximum with 30� slope, behind and above the wall (open drain) 

Type 3.

Surcharge of 610 mm maximum with 30� slope (retaining wall) 

• Concrete grade shall be 30-40 MPa 

• Bulk density of soil backfill to be19 kN/m3 

• Angle of internal friction of soil backfill to be 30�

H

mm

915

1220

1520

1830

2130

2440

2740

3050

3350

3650

1080

1080

1380

1690

1990

2300

2600

2910

3310

3770

0.79

0.90

1.11

1.31

1.50

1.69

1.87

2.04

3.14

3.49

1080

1080

1380

1690

1990

2300

2600

2910

3310

3770

0.79

0.90

1.11

1.31

1.50

1.69

1.87

2.04

3.14

3.49

1605

1845

2070

2300

2525

2750

2950

3150

3365

3575

0.98

1.17

1.35

1.53

1.70

1.87

2.03

2.94

3.17

3.40