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C) Tips and Caps Tips are cone shaped and made of plastic. They
go on thebottom or "leading" end of the Manchette tube. The
pointedbottom tip facilitates the insertion of the tube into the
boredhole and prevents foreign matter from entering the tube. A
capcan be placed on the top or "trailing" end of the tube to
preventforeign matter from entering the tube before grout is pumped
or between multipleapplications of grout.
D) PackersThe Packer is the device through which grout is pumped
into, and forced through, theholes in the Manchette tube. There are
two broad categories of Packers: 1. Inflatable SealPackers, and 2.
Sliding Seal Packers.
The two work in similar fashion; they are lowered or pushed
(horizontal tube) into theManchette tube until the packer is
halfway past a set of the holes drilled into the tube.Grout is
pumped into the top of the packer via a connecting hose (packer
rod) and groutpump. The grout flows through the center of the top
half of the packer and exits atopenings around the middle of the
packer which is approximately where the holes in theManchette tube
are. Seals at the top and bottom of the packer prevent the grout
fromsimply filling the tube and pouring out the top of the tube.
With no where else to go, thegrout is forced thru the holes in the
Manchette tube, past the flexible rubber sleeve intothe surrounding
environment (grout zone). When the desired amount of grout has
beenpumped at that particular level, the packer is slid to straddle
the next set of holes and theprocess continues. Following is a more
detailed look at the different packers.
Inflatable Seal Packer
As the name implies, this type of packer has expanding rubber
seals at either end. Besidesthe grout hose, a second, smaller hose
is connected to the top of the packer via which airor a liquid is
pumped into the seals ( with most people preferring hydraulic
inflation for speed and control ),thus expanding the seal tight
against the walls of the Manchette tube. After the grout ispumped
at that level, they are deflated in order to slide the packer to
the next set ofholes. There are two types of inflatable seals:1.
single chamber, and 2. multiple chamber,both of which are capable
of 1,500 psi working inflation pressures. The multi-chamber typeis
modular, with exchangeable rubber elements to change pipe sizes.
The modular rubberelements have steel rings imbedded inside the
rubber which create a multiple hourglassshape when inflated. Both
types can be either single element or two element (straddle)devices
and can have varied straddle distances (by changing out the center
section) forsimultaneous multi-port injection. The single chamber
type has a greater expansion rangeand thus, the advantage of being
able to seal a greater range of tube diameters with justone size
seal.
Sliding Seal Packer
The seals on this type packer are slightly larger than the
Manchette tube itself and thus fittightly against the tube walls
when the packer is inserted into the tube. There are threetypes of
sliding seals: 1. o-ring, 2. leather cup, and 3. poly-cup.
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Mechanical Packers
A mechanical packer is constructed of a short length of pipe
with one rubber seal aroundit. It normally does not use a Manchette
tube but one can be connected if necessary.
Instead, a hole, slightly larger than the packer, is bored into
the grout zone (such as aconcrete wall), and the packer is inserted
directly into this hole. A threaded screw, on topof the seal, is
then turned against the rubber seal, compressing it and causing it
to expandtightly against the walls of the bored hole. Grout is then
pumped thru the packer and outthe far end into the grout zone to be
stabilized/sealed.
E) Packer Rod The packer rod is a tough but flexible plastic
hose through whichgrout is pumped to the packer. Packer Rod comes
in bulk rollswhich are cut to the desired length. A threading kit
allows the userto put threads on each end of the cut hose to which
couplings arethen affixed. These couplings allow the hose to be
attached to theconnecting valve on one end and the packer on the
other end.
F) Connecting Valve The connecting valve controls the flow of
grout intoand out of the mechanical packer. There are two types:1.
Cone Valve, and 2. Ball Valve. The Cone Valve (leftphoto) can be
quickly disassembled and cleaned shouldgrout set up in it. Please
see our separate section on
grout pumps for more detailed information on pumpsand connecting
valves.
G) Grout Pump The grout pump does just that, pumps grout through
the connecting hose to the packerinserted in the Manchette tube.
Please see our separate section on grout pumps for moredetailed
information on pumps and connecting valves.
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