The rapid consolidation and compaction method comprises (i) first driving a hollow pipe, (ii) driving a pipe with a removable end plate after filling and compacting the sandy material in it, through the hollow pipe, to required depth, creating high excess pore-water pressures in the range of 50 to 300 KPa in clayey soils, (iv) pulling out the pipe section leaving behind the removable end plate and thereby installing porous displacement piles which allows dissipation of the excess pore-water pressures horizontally to the porous displacement pile, in which the excess water flows out vertically to the ground surface, and (v) the length of the drainage path is reduced to half the spacing between adjoining porous displacement piles, allowing rapid consolidation resulting in increase in density. Installing the porous displacement piles in the layer of loose to medium dense sand layer results in the instantaneous increase in its density.

The porous displacement piles comprising (a) closed-ended pipe piles with small holes and or narrow slots, filled with compacted sandy soil, (b) closed-ended porous pipe piles such as closed-ended pipe pile with very small holes and or very narrow slots, and (c) a precast prestressed porous concrete piles are driven through inside the already driven non-displacement hollow pipe piles in a grid pattern to create excess pore-water pressures generally ranging between 50 and 1500 kPa in cohesive soils, which begin dissipating through inside the porous displacement piles to rapidly consolidate and densify the said cohesive soil. The porous displacement piles are designed for permitting free flow of the pressurized pore-water and to prevent migration of particles of cohesive soil into the porous displacement pile using filter design criteria or verified by laboratory tests. These piles when driven in sandy soils densify sandy soils instantaneously.

The rapid consolidation and compaction method comprises (i) first driving a hollow pipe, (ii) driving a pipe with a removable end plate after filling and compacting the sandy material in it, through the hollow pipe, to required depth, creating high excess pore-water pressures in the range of 50 to 300 KPa in clayey soils, (iv) pulling out the pipe section leaving behind the removable end plate and thereby installing porous displacement piles which allows dissipation of the excess pore-water pressures horizontally to the porous displacement pile, in which the excess water flows out vertically to the ground surface, and (v) the length of the drainage path is reduced to half the spacing between adjoining porous displacement piles, allowing rapid consolidation resulting in increase in density. Installing the porous displacement piles in the layer of loose to medium dense sand layer results in the instantaneous increase in its density.

The rapid consolidation and compaction method comprises (i) first driving a hollow pipe, (ii) driving a pipe with a removable end plate after filling and compacting the sandy material in it, through the hollow pipe, to required depth, creating high excess pore-water pressures in the range of 50 to 300 KPa in clayey soils, (iv) pulling out the pipe section leaving behind the removable end plate and thereby installing porous displacement piles which allows dissipation of the excess pore-water pressures horizontally to the porous displacement pile, in which the excess water flows out vertically to the ground surface, and (v) the length of the drainage path is reduced to half the spacing between adjoining porous displacement piles, allowing rapid consolidation resulting in increase in density. Installing the porous displacement piles in the layer of loose to medium dense sand layer results in the instantaneous increase in its density.

The present invention relates to a pile foundation includes: a pile that extends in a vertical direction and that supports a tower structure, a pile head protruding above the ground, and a lower end of the pile being open; and a ground improving body that, in a state in which the pile has been driven into the ground, is provided inside the pile, and at least a part of the ground improving body being in close contact with an inner peripheral surface of the pile.

The present invention relates to a pile foundation includes: a pile that extends in a vertical direction and that supports a tower structure, a pile head protruding above the ground, and a lower end of the pile being open; and a ground improving body that, in a state in which the pile has been driven into the ground, is provided inside the pile, and at least a part of the ground improving body being in close contact with an inner peripheral surface of the pile.

A modular slab, slab system, piles and methods of use thereof are described along with specific applications and methods of manufacture. The slab or slab system may be pre-insulated and pre-finished before being assembled on site. The slab system may be advantageous to use as a replacement for traditional in-situ poured building foundations. The slab system may also have uses in other fields such as for floors, roads, bridges, pavements/side walks and other civil and structural applications.

A novel wind turbine, the tower of which ending with three legs and which is also anchored to the ground by means of a characteristic anchoring system depending on the type of existing soil. It is anchored on conventional rock soil with a pile foundation, it is anchored in a hard-rock soil with an anchor-rock foundation, it is anchored in a non-rocky soil with a gravitational foundation and it is anchored on clayey or swampy soil with a gravitational foundation reinforced with piles.

A novel wind turbine, the tower of which ending with three legs and which is also anchored to the ground by means of a characteristic anchoring system depending on the type of existing soil. It is anchored on conventional rock soil with a pile foundation, it is anchored in a hard-rock soil with an anchor-rock foundation, it is anchored in a non-rocky soil with a gravitational foundation and it is anchored on clayey or swampy soil with a gravitational foundation reinforced with piles.

A foundation for a tower structure, in particular for a tower of a wind power installation, comprising a soil improvement unit with piles and with a slab which is arranged on the piles and which has a foundation side, wherein the foundation side forms a foundation plane, and a shallow foundation which has an areal standing side for mounting onto the foundation plane, wherein the shallow foundation is arranged on the slab.