TRACTO-TECHNIK presents tailor-made HDD units at the Bauma 2004
Posted: 05 February 2004
In many cases telecom or gas service lines are later installed
from the main line into the utilities room of an existing building.
A complete new installation is also possible when new drinking water
and sewage pipes have to be replaced. Preferably the steerable bore
technique is applied for these jobs, especially when valuable surfaces
such as planted areas or garden walls, footpaths, stairs or similar
objects are situated in the planned installation path. The steerable
technique allows provision for house connections, which are normally
difficult to access, or have a difficult route, e.g. in blind sloping
locations.
The new mini-bore unit Grundopit Compact is ideal for this type
of application.
The drive, mixing unit and bore rig with rod box are installed
on a track-mounted undercarriage as a combined bore, drive and headstock
unit. This way the whole bore equipment can be transported to difficult
to access jobsites. The drive and boring operations are regulated
via a remote control. The pivotable rig boom with integrated bore
unit is situated on the carriage, which can be driven out horizontally
in the transport position and vertically in the working position.
The frame with bore unit is lowered hydraulically with a lifting
device into the tight 800 x 500 mm working pit and after fixing
just above the service line, is ready for use in the required bore
direction.
Operation is carried out via the remote control outside
the pit
The drill rod is placed into the rig from above and lowered
down to the bore axis via lift transportation, where it is automatically
screwed tightly together. The house connection, pulled-in in reverse
mode, is readily fitted with the necessary service ready for connecting
to the mains supply.
Using this fast reliable method and connecting technique, service
house connections to depths of 1,50 m can be produced.
The final mile without a trench
The installation of broadband fibre optic cables in existing
service pipelines (gas, water) and especially in sewage pipes is
– as long as they are in good condition and their functionality
is not impaired – a suitable alternative to open-trench methods.
The advantages of the dual use are obvious, but so far the house
connection for the user has proved unsatisfactory.
By 2010 as many households and factories as possible should be
provided with the „high-speed cables“(fibre optic)).
A tailor-made and economical house connection technique will be
necessary to achieve this, which, up until now, has not been possible.
As the use of open cut-house-connections are very costly and as
larger starting pits could not be applied, only a new installation
with the steerable HDD method proved to be appropriate, from each
manhole to the cellar in 50mm protection pipes or from manhole to
manhole in 100 mm protection pipes. The installation depth was pre-determined
at approx. 1,50 – 2,00 m and the bore lengths up to 50 m.
With the hydraulically operated Grundopit S these requirements
are fulfilled and for the first time fibre optic cables inside a
protection pipe from manhole to a user’s cellar or from manhole
to manhole can be installed.
And this is how it works
The existing pipe quantities in inner city areas make it
necessary to carry out sophisticated location of the existing pipes
and cables before starting to bore. The GRUNDOPIT bore rig is placed
on a working platform, installed in the nearest manhole. It then
adjusts itself to the inner diameter of the manhole. A core hole
is then cut out through the manhole wall.
The core cutting tool is exchanged and the standard steerable bore
head or the specially developed hammer bore head for harder grounds
is screwed to the first of the 50 cm long drill rods. The drill
rods are then successively and speedily pushed in and at the same
time the bore course is verified and, if necessary, steering corrections
made. Generally, the use of drilling fluid is necessary, which is
mixed in the supplied mixing system. The used drilling fluid is
collected and later disposed of. The bore head can drill into a
cellar through the house wall via a pre-bored core hole. Then the
backreamer can expand the pilot bore in reverse working mode. The
protection pipe for the fibre optic cable is pulled in directly.
Now, all that follows is routine work, e.g. sealing off work of
the cored bore holes in the manhole or cellar, as well as installation
and connection of the network cables.
For more information see www.tracto-technik.de
Posted by Richard Price,
Editor Pipeline Magazine
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