Velatia ORMAZABAL basic pfu Series - Levelling Process

IG-032-EN version 05; 18/06/2019
23
General instructions
pfu basic range: Prefabricated concrete
enclosure, ground-level walk-in type
Installation
8.4.3. Levelling process
Incorrect levelling may cause the body of the pfu to
break.
At least the following tools and equipment must be used to
ensure good levelling.
1
Spirit level
2
Pick
3
Square-end spade
4
Round-end spade
5
Wooden or plastic lump hammer
6
Levelling tools (boards)
Figure 8.3. Tools and equipment for levelling
Ground on slopes, with danger of ooding or high water
table level are prepared with specic procedures. All other
ground is prepared following the procedure set out for
ground in normal conditions.
Normal conditions
Position the reference level boards in accordance with
the levels shown in the drawings attached. The spacing
between the reference rules must be at least 2800 mm.
The ground is then levelled by sliding the levelling board (3)
on the reference level boards.
1
Level 0
2
Reference level boards
3
Levelling board
X
Final excavation depth level (see chapter 8.4.1)
Figure 8.4. Levelling specications (dimensions in mm) under normal
conditions