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Preboring method - Pile bissness(Construction)Contact

Preboring method

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

The Hybrid kneading method is a high bearing capacity construction method which strengthens bearing capacity and construction control more than a conventional construction method. It enables designs that are more flexible than ever, and it also introduces a new quality control method for construction and provides even more cost-effective foundation piles while being considerate of the environment.

Allowable bearing capacity in push direction

Expansion ratio 1.0 (bearing capacity factor α = 240) Expansion ratio 2.0 (bearing capacity factor α = 880)
(Note) Bearing capacity factor is in cases of sand ground and gravel ground

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 clay-based soil

Allowable bearing capacity in drawing direction

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

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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

(Bearing capacity factor α = 350)
(Note) Bearing capacity factor is in cases of sand ground and gravel ground

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.

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, we drill a certain amount of water from the tip using a kneading rod with a stirring bar, a kneading drum, and a special auger head.

Then, by using a drum affixed to a predetermined position, ta “wall” is formed by kneading the muddy soil on the inner peripheral surface of the hole, and the density of the mud remaining in the hole is lowered to a certain extent, making it easy to insert.

NEW kneading method
(bearing capacity factor α = 250)

BFK method

This is a friction pile construction method based on the kneading method using F piles (joint piles).

BFK method
(bearing capacity factor α = 150)

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Other preboring methods

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