Back to results
US 10,480,145 B2Granted
Method for burying precast pile
OwnerTakao Nakanoinventor
Life of this patent
Estimating the term…
Abstract
Provided is a method for burying a precast pile in which a borehole and a buried precast pile are strongly integrated, the end bearing capacity and the circumferential frictional force of the precast pile are increased, and the extraction resistance strength thereof is improved. Provided is a method for burying a precast pile in which a foaming agent having an expanding effect is added to the cement milk or mortar in advance, whereby the soil cement formed around the base of the precast pile in the borehole is caused to expand.
Claims12
A method for burying a precast pile, comprising:
- injecting cement milk or mortar in a borehole drilled in ground;
- producing soil cement by stirring and mixing the cement milk or the mortar with a drilled soil;
- and
- inserting the precast pile in the soil cement within the borehole,
- wherein a blowing agent having expanding action is added beforehand to the cement milk or the mortar, and thereby the soil cement formed around a base portion of the precast pile in the borehole is expanded so as to form the soil cement in a reverse taper shape that has a diameter reducing from a top of the reverse taper shape toward a bottom of the reverse taper shape based on a difference between a lower pressure at a top of the soil cement and a higher pressure at a bottom of the soil cement, and on Boyle's law under which a volume of a gas generated by the blowing agent is inversely proportional to a pressure of the gas under a constant temperature, and
- the reverse taper shape is formed without a formwork.
3 more elements
A method for burying a precast pile, comprising:
- injecting cement milk or mortar in a borehole drilled in ground;
- producing soil cement by stirring and mixing the cement milk or the mortar with drilled soil;
- and
- inserting the precast pile in the soil cement within the borehole,
- wherein a blowing agent having expanding action is added beforehand to the cement milk or the mortar, and thereby the soil cement formed around a base portion of the precast pile in the borehole has an expanding pressure that is gradually reduced with an increasing depth of the borehole so that the expanding pressure corresponds to a reverse taper shape that has a diameter reducing from a top of the reverse taper shape toward a bottom of the reverse taper shape based on a difference between a lower pressure at a top of the soil cement and a higher pressure at a bottom of the soil cement, and on Boyle's law under which a volume of a gas generated by the blowing agent is inversely proportional to a pressure of the gas under a constant temperature.
2 more elements
Dependencies are inferred from the claim text.