A spreader beam to be used with steel pins and lifting cables to avoid cracking at junction of side wall and base slab.
Stacking :
U-drains are to be stacked on level and stable ground to avoid cracking of base slab.
Laying :
For most installations, U-drains may be laid on sand bedding. However, in bad ground, it may be necessary to excavate deeper and place a layer of hard core before placing the sand bedding.
Jointing :
Butt joints. Where necessary, cement mortar is normally used to fill the gap between U-drain units.
Backfilling :
Backfilling with selected free draining backfill material. Avoid use of heavy vibratory equipment next to side walls.