ATT (ATT pile) pile is a type of hybrid pile (Hybrid Column) created by rotating the "winged steel pipe" to bury it in the cement-soil pile. ATT pile is a combination of highly reliable method "Teno-Column Method" (method has received the certificate of technical verification of Japan) and "EAZET-II screws" (technology has received the certificate of Japanese Ministry of Construction).
Pole-cement and winged steel pipe will combine to form a unified mass, thereby promoting the ability to bear a large force. ATT piles promote good bearing strength, especially in weak geological conditions. According to statistics from 2002, more than 3,000 projects in Japan have applied ATT piles. In addition, ATT piles are environmentally friendly piles due to the small amount of soil to be excavated, the noise and vibration in construction is very small.
The steel wing has been developed from the "Screw Pile Technology" (EAZET-II).
Cọc ATT
Construction process
Construction of ATT piles can be divided into two stages as follows:
Stage 1: Construction of soil-cement stake.
- The method of treating the deep layer by machine will not weaken the surrounding soil and ground at the pile head.
- Always ensure the mobility and non-frozen pile until the consolidation.
Stage 2: Fabrication of steel pipe with wings.
- Steel pipes with wings are easy to install, while ensuring the integrity of the pile.
- Because the steel pipe is sealed head so when the steel pipe has rotated wings to bury in the pile body will compact the soil-cement mixture. As a result, the amount of land to be excavated and transported is almost nonexistent.
Advantages of ATT pile
High vertical loading capacity
Steel pipe with wings will combine with soil-cement pile to effectively transmit the load, so ATT piles can withstand large vertical load.
High load capacity
Pole-cement and winged steel pipes will be combined into a single body, so the ability to bear the load will be greatly increased.
Extremely strong pulling ability
Can be installed even in narrow terrain, in residential areas
Easily control the quality and pitch of the pile head
Noise and vibration
The construction method causes very little noise and vibration so the construction will not affect the people and the surrounding environment.
No environmental pollution due to the amount of sediment generated very small
Size (standard)
Load bearing capacity
ATT piles promote good load capacity thanks to the combination of construction methods and materials. The combination of ground reinforcement by deep-layer composite treatment and the application of a rotating method for piling steel into the body of the soil-cement pile enables the load to be effectively transmitted. from the steel pipe to the twisted blade and from there through the pile and ground.
In addition, the method of treating deep-bed mixtures will allow the construction of soil-cement piles without weakening the ground. Moreover, when rotating to bury the steel pipe with wings, it is effective to pile and the surrounding soil will be tighter. Thanks to the twisted wing, steel pipes and cement piles can be combined into a solid. Moreover, thanks to the consolidation of soil and cement, the pile and surrounding soil will also combine to form a mass, thus promoting a high vertical loading capacity.
