For over 20 years, RECON has been constructing earth retention systems to create permanent foundations and temporary earth retention walls for our clients’ complex geotechnical needs. We have experience in implementing the following earth retention systems:
- Secant pile walls
- Diaphragm walls
- Beam and lagging walls
- Tie backs
- Soil nails
Secant Pile Walls:
Secant pile walls are composed of reinforced, interlocking, concrete piles, cast-in-place to form a wall. RECON forms secant pile walls by constructing a series of interlocking and contiguous drilled shafts with primary piles and secondary piles that are made of soft concrete and become interlocked when set. Secant pile walls are used for foundation support when ground conditions are unsuitable.
Because of their lack of noise and vibration during construction secant pile walls are attractive near buildings, roads, and other sensitive structures. RECON is experienced in working in constricted areas due to the infrastructure of the surrounding environment and can construct secant pile walls near these types of urban facilities.
Diaphragm walls are commonly used in congested areas for retention systems and permanent foundation walls. They can be installed in close proximity to existing structures with minimal loss of support to existing foundations. In addition, construction dewatering is not required, so there is no associated subsidence. Due to a diaphragm walls’ ability to keep deformation low and cause little vibration, they are convenient for civil engineering projects in densely populated metropolitan areas.
Beam and Lagging Walls:
Beam and lagging walls (also known as soldier piles and lagging) retain soil and provide support on open excavations using vertical steel piles with horizontal lagging. H-piles are drilled or driven at regular intervals along a predetermined excavation and lagging, consisting of wood, steel or precast concrete panes, is inserted behind the front pile flanges as the excavation continues. These temporary structures have less vibration during construction making them a good fit for densely populated areas.
RECON uses tie backs as temporary or permanent structures to reinforce retaining walls for greater stability. One end of the tie back is secured to the wall while the other end is anchored to another structure or into the earth. These structures give strength to resist forces which could cause the wall to the lean or bow.
Soil nails have been used to provide permanent and temporary structure during excavations and slope stabilization. They are ideal when excavation is required at a limited-access site, and can be an alternative to the high cost solider beams. This method can be constructed in a more economical way than other earth retention systems.