Interested to Buy Any Domain ? << Click Here >> for more details...
Any body please let me know how to prepare Method Statement
for Bored Cast in situ piles.
- 4 Answers
- 8062 Views
- Colliers International, I also Faced
- E-Mail Answers
Answer Posted / shubham rana
It is suggested that all utilities such as (cables, pipelines ,gaslines , sewerlines) falling within excavation area are diverted away in advance to avoid damage to such utilities during the excavation/ construction phase.
Initial hard strata of the ground is cut by a “Drilling Bucket” , which is a box like structure attached to Rig machine and has a sharp toothed like structure below it .
Then a temporary Mild Steel casing for about 4 to 6 m (approx) length from the ground level will be driven to protect loose soil from falling in the bore hole.
Then a Polymer Powder is added to form a slurry which provides a clear, solid-free, viscous borehole stabilizing fluid till the excavation is done for the piles. Polymer Slurry has a pH of 11 to 12, Specific Gravity of 1-1.04 and Viscosity 65 to 140.
After drilling borehole, reinforcement cage is lowered. While lowering the cage care has to be taken to install it in gap of 10 m and fillet weld of 6mm is to be provided to join upper end of previous cage with lower end of cage to be lowered.
After cage lowering , Tremie Pipe generally of diameter 200mm and 2-3 m length are lowered one by one and tied to each other . The gap between the bottom of the bore to the end of tremie pipe will be min 300mm.
Upper end of the tremie pipe is connecter to funnel shaped “Hopper” , to which concrete mix is poured .
As the Concreting Proceeds Concrete mix being denser replaces the Polymer slurry and slurry comes out of the borehole and is diverted away from the hole.
A very high Slump Concrete 150 – 200 mm is needed for piling ,regular compaction to be provided by Hydraulic Drilling Machine so as to ensure proper lowering of concrete .
After Few days of setting sonic tubes are filled with water and then in one tube ultrasonic wave emitter probe and in other receiver probes are inserted, knowing the distance between the two tubes , Relative energy, waveform and differential time are recorded and mapped. This is called “Cross Hole Sonic Logging”.
This gives qualitative idea of the structural soundness of the concrete throughout the pile and hence structural integrity of pile can be verified by this method.
| Is This Answer Correct ? | 0 Yes | 0 No |
Post New Answer View All Answers
a concrete mix 1 2 4 by volume with water cement ratio as .6 by weight if moisture content in F.A is 6% with 20% BULKING AND IN C.A 1.5% by volume. find quantities of different materials required for one bag of cement
Special thing in designing a overhead reservoir ? which is different from an ordinary design
What is labor and material payment bond?
How to determine dia of steel for use in column,slab etc. i mean how to calculate the diameter of steel which is to be used in structures.
why building got air crack? if it get in one particular are what is means?
what is the relation between pitch of steel and depth of slab?
How is improve my knowledge in construction industries....
What is the difference between yeild strength and compressive strength of steel???
What is the l/d ratio of cantilever beam?
How to calculate sand , cement quantity for 23mm thk brick work(10x10)
What are the responsibilities of a construction manager?
What is the tensile strength of marble?
What is the difference between engineering stress and true stress?
Slump Values for works?
How can you distinguish between sorption, absorption and adsorption?
