3. Piles: SANA GROUP has the knowledge and experience to offer Speciality Foundation Solutions and Drilled Shaft Foundations in any Ground Conditions. We provide a wide range of pilling methods and techniques for building developments and major structural projects.

 

The methods we can use include CFA, augered, bored, driven and drilled piles:
- Augered and Bored Piles are suitable for mostsoil conditions and being virtually vibration free, are ideal for working in close proximity to existing buildings.
- Driven Piles can be used in a wide range of soil conditions, are quick to install and produce no spoil.
- Drilled Piles can be used to provide rock sockets or to overcome obstructions within the ground.

 

4. Micropiles: Micropiles are small diameter drilled and grouted friction piles. Each pile includes steel elements that are bonded into the bearing soil or rock - usually with cement grout. Micropiles are an economical alternative to large diameter drilled shaft foundations, especially in difficult ground conditions and restricted access situations.

 

Micropiles - Minipiles Setup Sequence: Drilled into bedrock, micropiles or minipiles bond to the rock socket wall for load transfer.
• The casing of the minipiles are advanced as piles are drilled into site's bedrock.
• Drill pipe is removed, which leaves casing for mini or micropiles setting in bedrock.
• A reinforcement load bar is lowered into casings of the micropiles, for added capacity.
• Cementitious grout is pumped or pressure fed into the minipile casings, bottom up.
• The casings for the micropiles are lifted to the top of the bedrock, allowing the bonding to the bar.

 

5. Compaction Grouting: Compaction Grouting uses controlled displacement to increase the density of soft or loose soils. It is typically used for settlement control, structural releveling and remediation of sinkholes. A small diameter (2'' - 4'') steel casing is advanced through the zone to be improved, and a stiff mortar - like grout is injected at high pressure to displace and compact the surrounding soils. Pumping is continued as the grout casing is withdrawn, forming a large diameter ( 12'' - 18'' ) column of interconnected grout bulbs. As they form, they intensely compact the soil around them.

 

Compaction grouting is used to improve the ground beneath settling structures, provide excavation support, block the flow-path of viscous liquids, fill rock cracks, densify footing soils, remediate threatening sinkholes, and re-level roads, bridges, towers and existing structures. Compaction piles can be formed in the same manner to create a continuous structural support for foundations.

 

6. Soil Anchors: Soil anchors generally consist of steel elements (bars or strands) grouted in a drilled hole. The bars or strands are subsequently tensioned. This provides lateral or vertical force to resist movement of a retaining structure. Anchors are often used for excavation support, or as a part of permanent retaining walls, or to resist up-lift forces on foundations. Rock anchors are used to stabilize slopes and walls, proved tiebacks for bridges, stabilize dams, and secure caisson bottoms.

 

Anchor Advantages:
• Secure caisson bottom
• Stabilize slopes and walls
• Provide tiebacks for bridges
• Increase stability of dams
• Tension load tests

 

7. Soil Nails: Soil nailing is an economical technique for stabilizing slopes and for constructing retaining walls from the top down. This ground reinforcement process uses steel tendons which are drilled and grouted into the soil to create a composite mass similar to a gravity wall. A shotcrete facing is typically applied, though many architectural options such as precast panels or "green" vegetated cells are available for permanent wall facings.

 

Nailing Advantages:
• Used to follow irregular curves.
• Equipment is portable for tight spaces.
• The technique is flexible, easily modified.
• Created less noise and traffic obstructions.
• Less impact on nearby properties
• Requires minimum shoring space.

 

8. Shotcrete: Shotcrete is, in effect, a version if a cast-in-place concrete wall. Rather than placing concrete into forms, however, a fresh mix is sprayed onto wall panels that have been erected in the shape of the building. A nozzleman applies cementious based concrete from a pressurized hose to encompass the reinforcement and build up the wall thickness, forming structural shapes that include walls, floors, roofs, and other assemblies. Finished are often applied directly to the concrete while it is still wet.

 

Shotcrete Advantages:
• Cost effective building method
• Fast erection, particularly on curved walls and complex forms
• Hardened properties similar to conventional cast-in-place concrete
• Strong and durable
• Low permeability and good thermal mass