gmsminerepaircom G M S M i n e R e p a i r M a i n t e n a n c e F A B R I C A T I ON D I S T R I BU T I ON G R O U N D C ON T R OL 3013348186 44 Interlocking Timber Cribs GMS Interlocking Timbers Crib undergoing failure analysis at a NIOSH testing facility 0 50 1 00 1 50 2 00 2 50 3 00 3 50 4 00 4 50 5 00 0 2 4 6 8 10 12 14 16 18 20 22 V E R TI CAL L O AD k i p s D I S P L A C EM ENT i n c h e s N I OSH RE SE A R C H L A B ORA T OR Y G MS I N TERL OC K 11 21 2019 T e s t B I n t e r l o c k Cr i b 3 6 i nc h w i de 7 2 i n c h t a l l o a k Interlocking Timber Cribs are designed to replace four and nine point cribs in mine ceiling heights up to sixteen feet The support system consists of interlocking timber blocks stacked in layers Their interlocking capabilities create 100 contact between the layers increasing strength and stability as the unit length increases