1. PHC (Pretensioned spun High strength Concrete Pile) Pile
PHC piles are usually constructed by driven pile or pressing pile methods. However, in complex geological conditions, piles need to be pressed down to a great depth, providing piles with large diameter. If not, the pressing pile method is not possible.
To overcome these limitations, the pile drilling method can be used. Firstly, create the borehole to its desired depth, whose diameter is larger than that of the PHC pile, then lower the PHC pile in the borehole and execute cement grout, filling the gap between the borehole edge and the PHC pile edge.
This method has been used for several decades in developed countries, such as South Korea and Japan. In Vietnam, this technology has only been introduced in recent years.
2. Boread Pile
Bored piles are a very effective, state-of-the-art construction element with many applications in foundation and civil engineering.
As heavy foundations, securing deep excavation especially close to existing buildings as well as stabilising and retaining slopes.
In a variety of infrastructure projects such as tunneling, road or bridge construction as well as flood protection.
Retain ground alongside an excavation pit or close to adjacent buildings, often combined with other techniques such as ground anchors or soil nails.
For slope stabilisation to prevent landslides, or protect existing buildings.
3. Micro Pile
The micropile application has significantly extended to slope protection, ground improvement, and bearing capacity for various superstructures. Typically, the micropile diameter varies up to 300 mm.
It can be cased or uncased, reinforced cage(re-bar cage) or Thread bar of designed diameter inside the micropile depending upon the type of application and loading conditions.
Micropile performs as an excellent replacement for conventionally drilled shaft piles. Pile drill rigs allow installation in restricted access and low headroom interiors, allowing facility upgrades with minimal disruption to normal operations.
4. Sheet Pile
The sheet piles are steel sheets with interlocking edges that retain soil and are installed using vibratory and vibration-free rigs.
Sheet piles are installed sequentially to design depth along the planned excavation perimeter or seawall alignment. The interlocked sheet piles form a wall for permanent or temporary lateral earth support with reduced groundwater inflow.
The excavation depth deep, anchors may be included to secure additional lateral support if required.
