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Phase 3: Stabilizing
In this phase you add a trench around the tunnel and reinforce the arcs.
Digging Trenches
Let the concrete dry for approximately 24 hours. While you are waiting, you can dig trenches
around the poles (Figure 18). Figure 19 shows the poles after pouring concrete and digging a
circumferential trench.
NOTES:
•
Dig all the trenches outside the pole line.
•
If you intend to install a door at the front of the tunnel (FMD), dig the holes for the
door while digging the trenches, using the instructions provided with the door.
Figure 18: Trench details
Installation Manual for Model Alpine-135
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SOLARIG™ TUNNEL KIT
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