What is shaft construction:

Generally, the shaft is a vertical pathway that connects the ground service to the tunnel roof and is used in constructing tunnels. There are typically two shapes of it which are circular (permanent) and rectangular (temporary).

Our Accomplishments:

SCG has completed multiple types of piles, with diameters varying from 700mm to 1200mm, and over 250,000 piles. The deepest pile is approximately 88 m. SCG has completed slurry walls of over 472,088 cubic meters (Max. Depth of Slurry: 85 m) Use High Pressure Jet Grouting Pile technique during construction for presences of quicksand and high-water table. In the past 10 years, SCG has completed 118 deep shaft construction projects across the globe.

Methodology:

1. Secant Piles

Secant pile shafts are drilled using specialty drills which can maintain the critical alignment that is required for the secant pile wall to be effective. The shafts are typically 2 to 4-foot in diameter.

2. Liner Plates

A Liner plate shaft utilizes a series of flanged plates bolted together to form a ring. Additional rings are added as the shaft progresses in depth.

3. Open Caisson

An open caisson is a hollow structure with both an open top and bottom that is designed to keep water out of a construction zone. It is one of three caisson shaft types, which also include pneumatic and box caissons. Open caissons are used in trenchless operations, such as in the excavation of entrance or exit pits.

4. Diaphragm wall

A Diaphragm Wall is a deep reinforced concrete continuous retaining or cut off structure often used as permanent works on a project.