Type Of Steel Piles And Construction Of Steel Piles

What Is Steel Piles ?

 Type Of Steel Piles And Construction Of Steel Piles

          The steel piles are used as the load bearing piles in three different forms: 

 

(a) H-beam piles

 (b) Box piles 

(c) Tube piles

(a)   H-Beam Piles:

 

Fig shows the plan of a H-beam steel pile. These piles are usually of wide flange section and they are the most common variety of steel piles in general use. 

 

They are found very much suitable in especially for trestle type structures in which the piles extend above ground level and work also as columns for the Structure.

 Since H-beam piles have small cross-sectional area, they can be easily driven in soils in which it will be difficult to drive ordinary displacement piles. They are also useful for deep penetration through soft soil and also under circumstances when ordinary displacement piles are likely to cause damage to adjoining structures.

 

The driving  of H-piles is very simple and the energy from a pile hammer is effectively transmitted to the lower portion of the pile.

 

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(b)  Box Piles.

 

The box piles are of various forms such as Algoma box pile, Dorman Lon’s box pile, Frodingham octagonal box pile, Larssen box pile, Rendhex box pile etc.

 

 

Fig. shows the plan of a Larssen box pile. The various types of patented box piles are available. They may be rectangular or octagonal and formed by suitable combinations of steel sections. A box is formed and the pile is driven either with closed bottom or with open bottom. 

 In the latter case, it will be advisable to clean the box tor the full depth. The box is then tilled with concrete. A large volume of soil is displaced by a box pile and as a consequence, the end-resistance and the frictional resistance are built up rapidly Hence, these piles are used when it is not possible to drive H-beam piles up to the hard strata. The shaft friction and end-friction depend respectively on the perimeter and cross-sectional area of the pile. 

(c)   Tube Piles:

 

Fig. shows the plan this type of steel piles, the tubes are pipes of steel are driven into the ground. The piles may be driven either with open end or with closed end.

In the former case, the material inside the pipe is to be removed by suitable method. The concrete is then filled inside the tube piles. Because of their circular cross-section these piles are easy to handle and easy to drive. 

 Advantages of Steel Piles

1)These piles can withstand easily the stresses due to driving

2) These piles can be easily lengthened by the welding without causing any de lay in the driving operations 

3) The extra lengths of these piles can be cut off easily and there is no wastage ot material as the material thus removed has some value and it can be reused.

 4) The Bearing capacity of these piles is comparatively high The allowable compressive stress on steel section is taken as about 60N per mm to 80 N per sq. mm.

5) These piles can resist the lateral forces and bulking in a better way. 

6) These p les can be handled roughly without any serious damage.

7) In case of box piles and tube piles, it is possible to fill the hollow space with cement mortar instead of concrete. This will result in economy especially at places where the coarse aggregate is not available easily

8) These piles can take up impact stresses Hence, they are widely used in marine structures which are subjected to impact forces from the ships. 

9) These piles are not damaged by sea insects and they usually last for a long period. 

Disadvantage of Steel Piles: 

The corrosion is the only drawback of steel piles But it should not be looked upon as a serious drawback.

When steel piles are exposed to air or when they are subjected to alternative dry and wet conditions, the corrosion takes place. The corrosion is not a serious problem for lengths of please below water level. To prevent corrosion, the steel piles may be coated with anticorrosive paints are they may be encased with cement concrete.

 

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About Author:

I am Thomas Britto here to share my experiences in the civil engineering field to all my readers.Today many students are struggling to buy books at high prices. So I decided to start a blog and share my experience and knowledge with all my readers.

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