About to build a single story extension room to our home in the Lad Krabang Bangkok area. The extension is only 2 x 12m across the rear of the home to extend the kitchen and current living room. I have a couple of questions:

a.) Micropile - I estimate I need 6 piles (21cm diameter) to a depth of 25m. What is the market price for micropiling? Quotes I have gotten range from 18-22K which according to my Thai work colleagues is over priced.

b.) Extending Beams - I need to extend a series of 400x200mm beams out 2000m to the new ring beam. I am thinking of extending these beams using epoxy & rebar dowells to the new ring beam which will be supported by micropiles. Or should I also sink new piles alongside the old house piles as well?

 

Your help is much appreciated.

 

Richard

My thoughts!

a) If you have quotes and they are all in the same ballpark that is the price! sure there will always be others who say you are paying too much and they can get far cheaper - can they? If you are happy with the price go for it!

Think it depends on just how well the epoxy and dowels are fitted? for sure piles would give me more confidence in getting a good long term job done.

Good luck.

my thoughts also:

 

"I estimate I need 6 piles 21 diam to a depth of 25m"

 

for an extension?....my garden is 25m long as I am trying to put this into perspective...with difficulty.

do you mean 2.5m deep? surely you do?

 

sinking new piles adjacent to the house pile may undermine them. the lateral pressure of a new drill could actualy displace them.

Unless you have some serious loading to be carried on these shorter beams then drill and dowel and set a new pile say 1m away from any existing piles. if the loading is negligable just pay more attention to tying in the new beams, subject to your circumstances the preferable method would be to break the exisiting concrete to enable you to physically tie in the new cages then concrete the two back together