Goseeko blog
  • Home
  • Engineering
    • Civil
    • Electronics
    • Computers
  • Science
    • Chemistry
    • Maths
    • Physics
  • Commerce
  • Arts
  • E-Learning
  • Career
  • Exams
  • Scholarships
  • Hiring News
  • Goseeko- Smart Study Material
@2021 - All Right Reserved. Designed and Developed by PenciDesign
Top Posts
Goseeko launches its own certifications for engineering and...
Online certifications which you can get in a...
What is Race around Condition?
What is a Development Plan ?
What is a Co-operative Bank?
What are the properties of Laser?
Top 5 Websites for Academic Research
What is regula-falsi method?
Top 10 Engineering YouTube Channels for Engineers
What is Lorentz Transformation?
What are Toposheets?
What is Pumping and its types?
Civil

Under Reamed Pile

by Swati 30/10/2021
written by Swati 30/10/2021 0 comment
Under Reamed Pile

Under Reamed Pile:

  • Short bored under-reamed pile foundations are particularly suitable for black cotton soil. 
  • The principle of under-reamed pile foundations is the anchoring of the superstructure at a depth where the volume changes of soil are negligible.
  • One achieves the anchoring by enlarging the pile by under-reaming at this zone. Then One carries the superstructure on capping beams, which they kept clear of the ground.
  • The size of the pile depends on the safe load bearing capacity of pile and loading.
  • A pile diameter varies from 20 cm but for piles larger than 30 cm boring by manual labour becomes difficult.
  • The ratio of the diameter of under-ream to that of the stem may vary from 2 to 3, depending on the bearing capacity of the soil.
  • One bores the hole by auger and when it reaches required level, they enlarge the base to suitable diameter by a special tool.
  • They lowers the Reinforcement and fills the concrete in the hole.
  • Recently these short bored piles were provided with another enlarged rim at some height besides the under reaming at base.
  • At C.B.R.I Roorkee, they developed these double under-reamed pile. They suggested double reamed pile for two or three storeyed buildings on deep layers of black cotton soils.

Construction of Under Reamed Pile:

  1. Boring
  2. Under-reaming
  3. Concreting

1.Boring

  • This is usually done by manual earth auger, handled by a tripod hoist and winch. 
  • One ensures verticality of hole by a guide frame.
  • They may use Casing pipe in loose soil. 
  • They use extension rods for deep borings.
  • Drill bits or chopping bits can be used for hard soils.

2.Under-reaming

  • After reaching desired depth, they expands bore hole 0to form a ream or bulb with under reaming tool consisting of two collapsible cross blades with a bucket at the bottom to collect scraped soil.
  • Scraped soil collected in bucket is lifted up and disposed off from time to time. 
  • One should check the spread diameter before concreting.

3.Concreting

  • Soon after the boring operation, concreting is required to be done. 
  • Prefabricated reinforcement cage is to be first inserted in hole are concrete of required grade is poured or pumped in the hole.
Share
0
FacebookTwitterPinterestLinkedinTumblr
previous post
What is method of variation of parameters?
next post
What is the Important difference between Java and JavaScript?

You may also like

What is Ventilation?

30/10/2021

Types of Survey in Civil Engineering

30/10/2021

What is Evaporation ?

30/10/2021

What is Piers?

30/10/2021

What is Cofferdam?

30/10/2021

What is Caissons?

30/10/2021

Seismic Waves

30/10/2021

What is Reaction Turbine?

30/10/2021

What is Well Foundation?

30/10/2021

What is Workability ?

30/10/2021

Leave a Comment Cancel Reply

Save my name, email, and website in this browser for the next time I comment.

Keep in touch

Facebook Twitter Instagram Youtube

Popular Posts

  • 1

    What is Race around Condition?

    03/08/2021
  • 2

    What is a Development Plan ?

    02/08/2021
  • 3

    What is a Co-operative Bank?

    03/08/2021
  • 4

    What are the properties of Laser?

    02/07/2021
  • 5

    Top 5 Websites for Academic Research

    11/07/2021
  • 6

    What is regula-falsi method?

    03/08/2021
  • 7

    Top 10 Engineering YouTube Channels for Engineers

    10/07/2021
  • 8

    What is Lorentz Transformation?

    02/07/2021
  • 9

    What are Toposheets?

    07/07/2021
  • 10

    What is Pumping and its types?

    03/08/2021

Categories

  • Arts
  • Career
  • Chemistry
  • Civil
  • Commerce
  • Computers
  • E-Learning
  • Electronics
  • Engineering
  • Exams
  • Hiring News
  • Maths
  • Physics
  • Scholarships
  • Uncategorized

Read alsox

What is Piers?

30/10/2021

Types of Survey in Civil Engineering

30/10/2021

What is Caissons?

30/10/2021