|  The
areas to be protected should be graded to the required line
and level and free from obstructions. Where a geotextile filter
has been specified this should be laid onto prepared sub-grade
with overlaps of not less than 300mm – multiple thicknesses
should be avoided.
Following the provision of suitable toe support
the Ankalok blocks are then laid in courses
to a straight line working away from the toe beam. The first
two courses should be laid simultaneously to ensure that the
correct spacing and interlock is achieved. It should be noted
that the blocks are not intended to butt tight at the ends
but to have an open joint of approximately 10mm.
Following installation of the first two
courses it is advisable to set string lines perpendicular
to the toe at  approximately
6m centres thus maintaining a constant course length and ensuring
that the revetment remains square and uniform.
Filling and Seeding
On completion of installation the open cells and
joints of the revetments should be filled with material relative
to the nature of the applications. Below normal water level
this may take the form of angular gravel, suggested grading
of which is 10-15mm. Above water level the cells may be filled
with selected top soil and sown with a seed mixture suitable
to the location.
(Ref: CIRIA R116)
 Additional
Anchoring
Additional anchorage of revetment may be
provided by the installation of 40mm square timber of 25mm
diameter mild steel pegs driven through selected block cells.
Where it is difficult to provide a satisfactory toe support
at the base of the revetment additional restraint can be provided
along the top of the revetment by installing timber or steel
pegs at one per block i.e. 0.4m centres. |
