Semi or half: 'half screw pile' or 'semi-screw pile'

[Steven He]

Dear everyone:
I have encountered an expression for a pile, one half of which is a cylindrical body and the other half is like a screw，should I choose the expression ‘half screw pile’ or ‘semi-screw pile’ ？

thanks in advance!

[Mister Micawber]

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What kind of pile?
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Native English teacher at Mister Micawber's

[Steven He]

as in the fig. for construction
www.luoganzhuang.com/article/uppic/5616122008152541.jpg

[Mister Micawber]

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Sorry, Steve-- I can find plenty of pile drivers on-line, but I can't find a reference to a 'semi-screw' or 'half-screw' pile. In my opinion, either name would be OK.
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Native English teacher at Mister Micawber's

[Steven He]

thanks anyway！