Checking
site conditions, injection locations are confirmed. ( following careful, prior
evaluation of ground conditions, the procedure is carried out in two distinct and successive
phases )
At
one or more locations, used mechanical or hydraulic operated driller to drill holes a series of 16mm to
25mm (1”) in diameter are drilled to require depths from 1metre to 2 metre. To
insert packer and tubes
Phase 1. Stabilisation
Phase Shallow Consolidation
to
insert a mechanical packer or tubes place on the drill holes,closed tight ready
for injection. The resin is injected thru small holes into the zone immediately
and directly below the concrete slab with the intent of confirming or
re-establishing the soil ground contact by filling any voids which may be
present. In addition,any loose soil is encapsulated and immediate ground is
improved by an increase in shear resistance. If necessary repeated Injection is
recommended.
Phase 2 .Densification
Phase Deep Consolidation
During
phase 2. The resin is injected through long small diameter tubes,to the
required depth of 2 metre. As foundation support by secondary injection till
the entire Dense
soil is filled with resin preventing future’s further erosion or soil movement.To
inject 3 metre depth to received hydroswelling resin to to prevent massive
sand/soil from shrinkage that may caused soil borrowing.
Densification/consolidation
occurs adjacent to the point of injection,by filling or compacting large and
small voids and fissures, the expulsion of water and air and the formation of
conglomerates. Consolidation is verified and injection is stopped when the
concrete just begins to lift
Describing the
procedure in more detail:
Once,
the resin is injected enter the ground, it begin to expand in all directions,
developing a force of up to 10.000kPa (1000 tons/m2 or 1400psi ). Naturally
expansion is greater in the direction in which the resin encounters the least
resistance and so, initially, the resin moves,expands and compacts where the
foundation is weakest and has the greatest need of improvement
