Preboring method - Pile bissness(Construction)Inquiry
The pre-boring method is a method of digging up to a predetermined depth with an excavator such as an auger or a rod, and then installing and inserting a pile into the hole.
Among other things, the Hybrid kneading method, which is a high bearing capacity construction method, has a very high bearing capacity per pile and can handle even large horizontal forces by using Φ1500 for the pile head. Compared to conventional construction methods, it is possible to design more buildings with a single pillar. It is also possible to support high-rise buildings with large pull-out force.
Hybrid kneading method
Hybrid Kneading method is a method which strengthen high bearing capacity and construction controll more than conventional methods. It enables designs that are more flexible than ever, and introduces new quality control techniques of construction. Also, it provides more cost-effective piles, being considerate of the environment.
- Allowable bearing capacity in push direction
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Expansion ratio 1.0 (bearing capacity factor α = 240) Expansion ratio 2.0 (bearing capacity factor α = 880)
Expansion ratio 1.0 (bearing capacity factor α = 200) Expansion ratio 2.0 (bearing capacity factor α = 800)
(Note) Bearing capacity factor is in cases of sand ground and gravel ground
(Note) Bearing capacity factor is in cases of clay-based soil - Allowable bearing capacity in drawing direction
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Expansion ratio 1.4 ~ 2.0 (bearing capacity factor κ = 157)
(Bearing capacity factor is in cases of sand ground and gravel ground)Evaluation Form (The Building Center of Japan)
Hybrid kneading method
Hybrid kneading II method
The Hybrid Kneading II construction method is a high bearing capacity method that strengthens the bearing capacity and construction control wtihout using a special shaped pile.
Additionally, it adopts a new quality control method in the construction process and strengthens construction management. It provides basic foundation piles with higher cost-effectiveness than ever while also being considerate of the environment.
- Hybrid kneading II method
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(Bearing capacity factor α = 350)
(Note) Bearing capacity factor is in cases of sand ground and gravel groundCertification
Hybrid kneading IIc method
Hybrid kneading Ⅱc construction method is a high bearing capacity construction method that uses straight piles with the tip ground being clayey ground.
- Hybrid kneading IIc method
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(Bearing capacity factor α = 313)
Certification
Super kneading method
Grade A uses BF piles for the lower piles. Grade B uses a high bearing capacity method using BF.S piles (extended node piles) for the lower piles.
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Grade A (bearing capacity factor α = 425)
Grade B (bearing capacity factor α = 425)
(Note) Bearing capacity factor is in cases of sand ground, gravel ground, and clay-based ground.
NEW kneading method
In this method, kneading rod with stirring bars, kneading drums, a special auger head and drilling water are used to excavate. Kneading drums knead the muddy soil as the wall and lower the density of the remained mud in the hole so as to make it easy to insert piles.
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NEW kneading method
(bearing capacity factor α = 250)Certification
BFK method
This is a friction pile construction method based on the kneading method using F piles (joint piles).
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BFK method
(bearing capacity factor α = 150)Certification
Other / kneading method / cement milk construction method
Other preboring methods
