18 August 2008

Bolts into the earth

The geothermal drilling guys were back at work today and managed to drill three out of the five holes that we need for our system. The holes are 150 feet deep and progress on the drilling was pretty rapid - the rock beneath us is mostly shaley, rather than thick slabs of limestone, so they were pleased with how quickly their carbide drill got through it. In the video you can see how steadily the drill is descending.



Lucky we're not the type of people to worry about having a perfect lawn, I think.

Here's the piping that goes into the hole:
And here's the end piece, which the piping is attached to (not in this picture, but it was later) and which is weighed down with a long metal rod to ensure that it reaches the bottom of the hole:


The pipes are filled with water for the moment, which will be replaced with a glycol/water mix later. They've nearly finished for today, which is just as well because the satellite picture is showing a beefy line of thunderstorms heading our way (we're on the sticky-out bit of land between Peterborough and Kingston).

The sky is already looking a bit peculiar - rather the texture of a brain, I thought.


Ah, here it comes. Over and out.

1 comment:

easygardener said...

Lightning...always frightening...but still exciting (from a distance).