What is pile foundation and its types?

Pile foundation, a kind of deep foundation, is actually a slender column or long cylinder made of materials such as concrete or steel which are used to support the structure and transfer the load at desired depth either by end bearing or skin friction. Pile foundations are deep foundations.

What is pile foundation used for?

Pile foundations are principally used to transfer the loads from superstructures, through weak, compressible strata or water onto stronger, more compact, less compressible and stiffer soil or rock at depth, increasing the effective size of a foundation and resisting horizontal loads.

What is construction method of pile foundation?

There are two basic construction methods; bored piles, in which the concrete is cast in place, and precast concrete piles that are driven into the ground. With cast in place piles, the hole is bored into the ground, a reinforcement cage installed and the hole gradually filled with concrete.

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How do pile foundations work?

how piles are constructed

  1. hammer a thin-walled steel tube into the ground.
  2. remove all earth left inside the tube.
  3. lower a steel reinforcement cage into the tube.
  4. cast the pile by pouring wet concrete into the tube.

What are the types of pile?

5 Types of Pile Foundation

  • Bored Piling. Bored piles are installed by auguring into the ground forming a hole into which concrete can be poured, thereby casting the pile in position.
  • Driven Piling. Driven piles are driven or hammered into the ground with the use of vibration.
  • Screw Piling.
  • Mini Piling.
  • Sheet Piling.

What are the different types of pile?

There are three types of pile foundations according to their construction methods which are driven piles, cast-in-situ piles, and driven and cast-in-situ piles.

What are the 3 types of foundations?

There are three main foundation types; basement, crawlspace, and concrete slab. A fourth, but a less common option, is wood foundations.

Why pile foundation is preferred?

The pile foundation is necessary to resist the uplift forces created due to water table rise or any other cause. These structures will need pile foundations. Pile foundation is necessary for areas where the structure surrounding has chances for soil erosion. This might not be resisted by the shallow foundations.

What are the advantages and disadvantages of pile foundation?

Main advantages of pile foundation are high load capacities and corrosion resistance. And there is a disadvantage of piles foundations also acids that can damage the concretes and may occur salt water reactions. If there is soil on it we cannot keep the building vaccinated on it, so the pile foundation is used.

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How is pile capacity calculated?

Step 2: compute the ultimate end bearing capacity (acting as individual piles ). Ultimate end bearing capacity in clay = Nc × C × pile tip area (Nc = 9). Ultimate end bearing capacity in soft clay = 9 × 120 × π × diameter2/4 = 848.2 lbs/per pile. Total ultimate bearing capacity per pile = 76,920 + 848.2 = 77,768 lbs.

How much does a pile foundation cost?

Pile Foundation Prices Installing piles costs $20 to $60 per linear foot of pile with a minimum cost of $28,000. That price includes labor, equipment and materials. Steel costs 25% to 35% less than prestressed concrete.

What is the minimum depth of pile foundation?

Depth of deep foundation depend on applied load on structure If the load on foundation is 500KN, minimum depth is 3.5m to 4.5m, If the load on foundation is in the range of 2000KN to 3000KN, minimum depth for pile foundation is 6.0m to 20.0m with pile caps.

How deep do piles go?

What is the maximum depth? With the benefit of using pile joints, precast concrete piles can be driven to lengths longer than 30mx. Often concrete precast piles can be driven down to 30m, however, in special circumstances, such as offshore projects, piles can be driven down to a maximum of 150m.

What are the two types of piles?

Hemorrhoids are classified into 4 different categories Internal, Prolapsed, External and Thrombosed.

Is pile foundation expensive?

The construction of piles foundation for individual houses will be cheaper if the excavation can be conducted by hand and the project condition should be suitable for cost effective, uncased, mechanically augured piles. Foundations should be selected and designed based on the soil condition at any loading station.

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