CONSULTANCY

Pull–out Tests & Geotechnical Surveys

DESCRIPTION

SYNTH3SIS’S engineering team can undertake ground site investigations of the subsurface conditions for the selection of the proper mounting structure and foundation type according to any design requirements.
A PV plant site should first be checked by digging several test pits randomly selected at the corners of the array area and then evenly throughout the plot. A comprehensive geotechnical survey can then be conducted by our engineering team.
That will include a limited number of test bores noting soil type, refusal, and water table level. The geotechnical survey will monitor corrosive factors to help in selecting the correct type of corrosion protection needed for the foundations. Geotechnical surveys often tend to be very conservative and according to European and International Geotechnical Standards a number of site pull-out tests should be conducted after selection of foundation type in order to minimize embedment depth, and thus length and cost of screwed or rammed pile foundations.
A standard pull-out test uses a strain gauge meters to measure vertical and lateral resistance up to the design forces by the PV support structure engineer’s calculations for wind and snow load requirements. Pull-out tests are conducted at varying embedment depths and at multiple site locations, making sure to encompass each of the different types of soil conditions encountered.
There are four principal types of foundations commonly utilized. Driven piles, helical piles, earth-screws, and concrete blocked foundations.