Tip:
Highlight text to annotate it
X
Bolts tensile testing www.speleo.gr
Tests
Hole not cleaned. Bolt tighten by experience
Hole cleaned. Bolt tighten more than specs
Hole cleaned. Bolt tighten according to specs
Hole cleaned. Bolt tighten according to specs
Hole cleaned. Bolt tighten according to specs
Tests took place on the same rock
1st test. Fischer FBN II 8/30 Hole not cleaned. Bolt tighten by experience
Bolt failed at 1550kg Hole not cleaned. Bolt tighten by experience
2nd test Fischer FBN II 8/30 Hole cleaned. Bolt tighten more than specs
Bolt failed at 1660kg Hole cleaned. Bolt tighten more than specs
3rd test. Fischer FBN II 8/30 Hole cleaned. Bolt tighten according to specs
Bolt failed at 1920kg Hole cleaned. Bolt tighten according to specs
4th test. Hilti HST M8x75/10 Hole cleaned. Bolt tighten according to specs
Rock failed at 1500kg Hole cleaned. Bolt tighten according to specs
5th test. Hilti HST M8x75/10 Hole cleaned. Bolt tighten according to specs
Rock failed at 2290kg Hole cleaned. Bolt tighten according to specs
Bolt was here
6th test. Hilti HST M8x75/10 Hole cleaned. Bolt tighten according to specs
Bolt failed at 2310kg Hole cleaned. Bolt tighten according to specs
7th test. Spit FIX Z 90/40-27 A4 Hole cleaned. Bolt tighten according to specs
Bolt failed at 2465kg Hole cleaned. Bolt tighten according to specs
Results
Bolts tighten according to specs have increased strength
Bolts for cracked concrete have a significant higher strength