LAYING THE CHANNEL
STEP 1: DIGGING THE TRENCH
Dig the trench considering the sizes based on the space taken up by the channel, the
installation bed and the space for the concrete backfill (See installation image). The land shall be well pressed, especially if the ground is soft.
STEP 2: CONCRETE CASTING LAYING
Lay a bed of concrete of the recommended thickness.
STEP 3: LAY THE CHANNEL
Lay the channels on the ground, assemble the grids and tighten screws.
STEP 4: LATERAL SUPPORT IN CONCRETE
Apply a lateral backfill onto the channel with suitable concrete and thickness as recommended.
The concrete should be vibrated and rendered and it should fill in all interstices, in particular
behind the support edgings of the grids. (This is the most important step, because it guarantees
high resistance to heavy loads and a long-term resistance of the channels.) For the highest load classes (D400, F900) we suggest reinforcing the concrete with steel rods for better load distribution.
STEP 5: THE FINISHING
When the concrete is solidified, it is possible to proceed with the flooring in asphalt, tiles or paving. During this step it is recommended to cover the grids with a plastic film in order
not to dirty them.
INSTALLATION DATA MIN CONCRETE COMPRESSIVE STRENGTH
C250 - X = 120mm, Y = 150mm, 25N/mm2
D400 - X = 150mm, Y = 200mm, 30N/mm2
F900 - X = 200mm, Y = 250mm, 35N/mm2
Load class (EN 1433)
Applicable load (EN 1433)
Y Minimum height of the concrete bed
X Minimum width of the lateral concrete backfill
Compression resistance class of the concrete (EN 206 – 1)
We highly recommend to vibrate and compact the concrete with care.
The quality of the concrete used for the bed and backfill is essential for the life span of the channel and for its resistance to loads. The following features are essential requirements:
Compressive strength class Rck (EN 206 -1) is recommended .
Gravel aggregates with a maximum diameter Dmax 8 mm, non reactive to alkali and must be frost resistant cement. We recommend that you vibrate the concrete appropriately so as to avoid air bubbles and to be sure of the perfect adherence of the concrete to the channel.
The LIBERTY DRAIN© channel system features a number of preset side and bottom channel connections points. To create the apertures on these connection points, make initial drill holes within the partial wall pre-cut areas and then neatly cut out the full assigned aperture using a saw or other suitable cutting apparatus.
Although it is not a requirement to regularly clean the LIBERTY DRAIN© channel system, it is good practice to remove the silt and any debris that may have collected by use of a pressurised water jet. If gratings are removed for this process, please replace the gratings making sure all the locking bolts have been correctly located.