• Augercast
• ​Sheet Pile
• Soldier Pile & Lagging
• Driven Pile Foundation
• Marine Construction

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Augercast

 In the appropriate soil profile, augercast pile is an economic alternative to traditional high-capacity deep foundations. Augercast piles cause minimal ground disturbance and are often used for noise and environmentally sensitive sites. These piles are typically best suited for ground conditions consisting of sands and silts below the water table.

An augercast pile, also known as a CFA pile, is formed by drilling into the ground with a hollow stemmed continuous flight auger to the required depth or degree of resistance.
No casing is required. A high slump concrete mix is then pumped down the stem of the auger. While the concrete is pumped, the auger is slowly withdrawn, lifting the spoil on the flights. A shaft of fluid concrete is formed to ground level. Then a pile rebar cage can be placed into the still-fluid shaft to provide additional strength.

Advantages of Augercast Piles:

• Rapid installation — even in poor soil conditions
• Less noise — drilled and pumped piles eliminate the hammer impact noise heard with driven piles
• Minimal vibrations and disturbance
• No casing needed — auger holds the shape of the pile hole during the drilling phase of augercast pile installation
• Works in low-headroom spaces — augercast piles can be installed in existing buildings with as little as 7-foot clearance

Sheet Pile

Unlike bearing piles, sheet piles are considered retaining piles. They are special shapes of interlocking piles made of steel, wood, or concrete which form a continuous wall to resist horizontal pressures resulting from earth or water loads.

Sheet Pile Applications:

• Bulkhead Structures – Bulkheads are an integral part of waterfront structures such as wharves and docks
• Cofferdams - These structures exclude water and earth from an excavation to facilitate construction
• Small dams and cutoff walls - Sheet piles used to form small dams and more frequently cutoff walls beneath water retaining structures to control seepage through the foundations
• Bridge piles - Sheet piles are used in the construction of bridges and left in place. For example, a pier may be formed by driving steel sheet piling to create a circular enclosure, excavating the material inside to the desired depth, and filling the enclosed space with concrete
• Sea walls – Sheet pile are used to construct Sea walls that are parallel to the coastline to prevent direct wave and erosion damage

Soldier Pile & Lagging Wall

​Soldier pile and lagging walls are commonly
used systems for supporting excavations in urban environments where property lines, roads, and utilities prohibit sloped or benched excavations. The main components of soldier pile and lagging excavation support systems are steel H-piles placed
vertically from 4 to 10 ft. on center with lagging placed between the piling to retain the soil. Once the H-piles are installed, excavation can proceed. As the excavation is advanced, lagging is placed between the soldier piles. The lagging may consist of rough sawn timber, metal decking, or even pre-cast concrete planks. The stability
of the wall is dependent on earth pressure that is being resisted by pressure on the inserted section of the pile.

Advantages of Soldier Pile & Lagging Walls:

• Soldier pile and lagging walls can be more economical and faster to construct than many other earth shoring systems
• When there is not enough physical room to use a sloped or benched excavation system

Installation Methods:
SC has the expertise and capabilities of installing H-piles in a wide range of different soil conditions. We also have the know-how to install piles in environmentally sensitive
areas, projects with difficult access and in locations where there are noise and vibration constraints.

I. Impact Driving

• Driving H-piles with a impact hammer suitable for dense and/or hard soil conditions or if high capacity piles required

II. Vibrating the Piles

• Vibrating the H-piles with a vibratory driver/extractor in wet granular soil conditions or when there are low noise emission constraints

III. Pre-Drill and Grout the Piles

• In extremely hard soil condition we can pre-drilling a hole and wet-setting the pile in a grout column at the bottom of the excavation

Driven Pile Foundation

Subsurface construction specializes in driven pile foundations to provide the necessary support for even the largest construction projects. Typically, driven pile foundations are recommended when there are large design loads, poor soil at shallow depths, or due to site constraints.

Driven Pile Applications:

•  Driven piles are suitable even when there is a layer of weak soil at the surface. This layer cannot support the loads, so the pile acts to bypass this layer and transferred the loads to a layer of stronger soil or rock that is below the weak layer
• When high load-bearing capacity is needed The soil displaced by driving the piles compresses the surrounding soil causing greater friction against the sides of the piles, thus increasing their load-bearing capacity

I. Timber Piles:

• Excellent longevity when installed below the groundwater level or in marine applications
• Length maybe adjusted by simple carpentry
• Timber piles are more flexible than steel or concrete piles which makes them useful in fenders, dolphins, small piers, and similar structures. They will deflect considerably, offer lateral resistance, and spring back into position absorbing the shock of a docking ship or other impact
• They can be extracted easily in the event that removal is necessary

II. Steel Piles:

• Steel piles offer high elasticity. A steel pile may be bent and even kinked to some degree and still support a large load
• The strength of steel piles is high permitting long
  lengths to be handled

III. Precast Concrete Piles:

• Precast piles are strong, durable and may be cast to the designed shape for the particular application
• Precast concrete piles can be driven to high resistance without damage. They are assigned greater allowable loads than timber piles
• Precast concrete piles are not subject to deterioration.

Marine Construction

MARINE PILING AND MARINE SUPPORT:
Marine construction is at the heart of Subsurface Construction excellent track record. Our company has extensive experience in all aspects of marine
construction from building docks and ferry terminals to deep foundation and offshore pile driving. Additionally, our crews are experts in barge and anchor handling. We
provide and operate barges to safely assist in marine construction projects.

Marine Services Include:

• Straight wall and cellular steel sheet pile bulkheads
• Mooring and breasting dolphins
• Pile-supported structures
• Cofferdams
• Stub pile repair and retrofit
• Barge Support to cater to marine construction safely and even in inclement weather conditions