Silent Piling

Silent Piling pressing system

Quiet, vibration-less installation and removal of steel sheet and foundation piles.

The Dawson concept

The Dawson silent piling pressing system technique starts when powerful hydraulic clamps take hold of the tops of several interlocked steel sheet piles.  The piling rig then applies down-crowd force, pushing all piles until the rig reaches its safe load limit.  This usually achieves several metres of penetration.

Maintaining this initial pre-load the hydraulic cylinders then apply vertical force to a single sheet pile whilst reacting on the rest of the pile group.

This downward force requires an equal and opposite reaction.  Initially, most of this reaction is provided by the combined weight of the piling rig and the reaction piles.  However, as penetration of the pile group advances the skin friction between the reaction piles and the ground becomes the most significant factor in developing adequate total reaction.

Once all piles in the group are advanced by the full stroke of all hydraulic cylinders, the entire pressing device retracts, ready to repeat the cycle.  This simple process is the same irrespective of the total number of cylinders. 

With the pile group fully installed the next group can be positioned and the whole process is repeated.

The rigid leader provides perfect pile alignment minimising interlock friction and producing a high quality installation.  Unlike conventional presses there is no need to build a temporary reaction frame to start the first sheet piles.

Pile Extraction
Sheet pile extraction is simply undertaken in reverse order to that described above.  The piling rig provides a maintained upward force on the press assembly with one or several hydraulic cylinders providing the upward extraction force on a single pile.

Principal Advantages
.   Quiet and vibration-less
.   Powerful Silent Piling force of up to 200 tonnes for effective installation and extraction
.   Fast installation or extraction rates deliver high productivity and economy
.   Ready configured to suit Z, U & H-pile profiles in groups of between 2 to 6
.   No reaction frame required to start pile installation - unlike conventional pile presses
.   Corner piles easily installed without reaction frame
.   Offers truly recyclable foundation solutions
.   Standard Z-piles can be installed close to property boundaries - maximise development footprint
.   Leader guided operation reduces interlock friction and produces high quality, accurate installations
.   Piles can be removed, returning site to original ‘greenfield’ condition
.   Piles can be threaded without the use of a crane

Extra Advantages
.   Can be configured to install high capacity foundation piles formed by interlocking 4, 5 or 6 sheet piles
   
in a box - SWL capacities up to 1400 tonnes
.   No spoil removal to landfill
.   No ground heave
.   Pile capacity measured during installation
.   Immediate loading
.   Low mass/volume material transport
.   Will accept side loads
.   Piles can be extended out of the ground to form permanent piers or columns

Technical Brochure  icon_pdf
Foundation Piling     icon_pdf
4 Cylinder Push Pull icon_pdf


Video links >
4 Ram sheet pile configuration >
4 Ram box configuration>


Steel Piling Group job reports for the Dawson pressing system >
Box pile foundation >
London Underground Upgrade >
Sustainable Piling, The Grosvenor Waterside, London >
Slip Road Improvements, M3 Motorway >


Click below for Case Studies >

SILENT PILING  SILENT PILING SILENT PILING

Pressing system,
Maryland, USA (2007)
9m long
AZ38-700 piles on a
vibration sensitive
development,
Read more>

Whaddon Road Bridge,
Milton Keynes (2003).
High capacity box piles
/piers and abutments
were formed from four
Hoesch Larssen 43 sheet
piles clutched together.
Read more>

New Basement, Hornsey
Street, London (2005).
The AU16 sheets were
between 6.5m and 8.5m
long (fully driven into stiff
London Clay).
Read more>