SOLARIG™ TUNNEL KIT
Installation Manual for Model Alpine-135
- 15 -
Stretching a String Frame
NOTES:
•
Keep the marking stakes
in place
until the end of the pouring concrete stage, to
keep the base marking.
•
Pull the builder twine taut (tightly), ensuring that it does not touch any obstacle.
Steps:
1.
Stretch builder twine between the marking stakes, 15 cm above ground level.
2.
Use a marker or coloured chalk to mark the centre of each dug hole on the builder
twine, where the centres of each arc will be.
3.
Determine the corners according to the figures below and use the golden triangle
(Figure 8) to create 90
o
between the sides of the structure.
4.
Establish the basis for further measurements by creating a frame 17m long by 9.04m
wide using builder twine.
Figure 7: Marking distances
Figure 8: Golden triangle
