Combi-Wall Systems
L.B. Foster Company is dedicated to providing the most efficient combi-wall system for your needs utilizing a
variety of components. Using wide–flange beams or pipe piles along with extruded connectors from PilePro®
and PZC™ sheet pile from Gerdau, L.B. Foster is able to provide an efficient solution to meet your project
requirements.
L.B. Foster combi-wall systems have a range in section modulus of 50 in3/ft. to over 1000 in3/ft. Domestic
systems (100% melted and manufactured in the USA) are available.
The systems shown represent only a portion
of the variations possible. Intermediate sheet Intermediate Pile
pile function as earth retention and for load
Connector
transfer. The sheet pile is only required to resist
active earth pressures down to the zero earth
pressure level and may extend below this level
as a safety measure. Shortening the lengths of
the intermediate sheet pile will reduce the cost King Pile
of the job and facilitate installation.
Metropolitan Transportation Authority, Staten Island, NY
Freeport Water Authority, Sacramento, CA Cabrillo Way Marina, San Pedro, CA
www.lbfosterpiling.com
Combi-Wall Systems
Combi-walls are piling walls that are comprised of high modulus structural components interspaced by
lighter sheet piles. The high modulus components - known as king piles - can be tubular, box, bearing or
other types of fabricated piles.
It is essential that a stable, heavy, adequately rigid and straight pile-driving template frame, adapted to suit
the length and weight of the pilings, be provided.
The king piles are fixed into position within the template using welded bracket guides which take into
account width tolerances.
Driving of the king piles must be carried out with extreme care in order to ensure that they are embedded
straight and vertical, or at a prescribed batter, thereby guaranteeing that they are parallel to each other and
at the required spacing.
The driving sequence of the king piles must ensure that the pile toe encounters soil uniformly on its total
circumference and not just on one side.
This is achieved by driving in the following sequence:
1 7 5 3 2 4 6
(large driving step)
At least, however, the following sequence should be observed:
1 3 2 5 4 7 6
(small driving step)
In general, all of the king piles should be driven in sequence to full penetration without interruption.
Following successful completion of this, the intermediate light piling sections can be set and driven. During
the setting and driving operations of the king piles, a constant check (using theodolites) should be made of
their alignment in relation to the wall.
When the guide frames have been removed, a final survey should be made to ensure that the deviations
in the distance between the king piles are within the acceptable tolerances in order to allow the proper
installation of the sheet pile. However, if the deviations are outside the specified or practical tolerances, then
either the intermediate piles have to be adjusted or the king piles must be extracted and re-driven.
To overcome difficult driving conditions, it may be possible to use: jetting; excavating inside the king piles;
or any other the ground pre-treatment methods normally adopted for sheet piling.
Above text taken from the “NASSPA Best Practices Sheet Piling Installation Guide.”
Combi-Wall Solution Variations
L.B. Foster is dedicated to offering the most efficient combi-wall system for your needs through utilization of
our vast array of systems designed to your specific requirements.
Wide Flange with Extruded Connectors Pipe Pile with Extruded Connectors
O-Pile® with Extruded Connectors
Red Rock Hydroelectric Project, Pella, IA
www.lbfosterpiling.com
Combi-Wall Systems
L.B. Foster combi-wall systems can be supplied with a range of connections. Each connector series offers
distinct advantages to assure you have the best system for your project.
One leg BBS connectors: WOM / WOF connectors:
Universal and in stock - ready for quick orders Used in weight efficient pipe combi-walls
Field or shop weld full length to beam Field or shop weld full length to pipe
Z-Profile Flanges
Extra laying width
Use any Z-profile sheet
Shop fabricatred and welded
