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As above eqs 13a and 14a are written for the design of timber crane mats and eqs 13b and 14b are written for the design of steel or aluminum mats9 1011 12 13a 13b 14a 14b15where l eff effective mat bearing length q t actual ground bearing pressure and all other terms are as previously definednote that this method . The first product of this work was the paper effective bearing length of crane mats which was presented at the 2010 crane rigging conference in houston this paper is used as a reference in keith andersons book rigging engineering basics in the chapter on load spreading for mobile cranes. Engineering independent testing of rig mat core 11 12 crosslamr clt crane mat properties 13 crane mat weight distribution 14 crane mat shipping sizes available 15 engineering analysis of crosslamr clt crane mats 16 17 quality assurance 18 cleaning phytosanitary elements 19. Track bearing length 3700 ft soil bearing method mat strength method ground bearing pressure c bearing width of track 590 ft p load applied to one mat 188632 lbs p crane load applied to one mat 188632 lbs 7915 of allowable capacity t tl2track toe load 7993 lbs ft2 a. Mat size deducted from point load in 3 in kns soil type value 2 73500 x 981 721035 kns 7210kns 300kn m2 240 m2 16m x 16m minimum a soil is compact ground gravel 100mm in depth covered in tar two outriggers will be placed here