TBTB/T16718519851231198701011.2.D11Dmm60607060656065:3.L22Lmm1001201401601801001201401601802001001201404.3165.454kNsm10050120805012012080150603080:B6cmf6075min-115kNDmm65708.511.5606.59.56.TB1491837.—kNsmmmmmCj11470100J1140mm70mm100kNsm23142536475869()A1.41OOkNsm80kNsm60kNsm120kNsm6080kNsm70kNsmA2.A2.1.80kNsm60mm80120kNsm65mm70mm120150kN.sm70mmA2.2.58kN70mm65mm6kN60mmA2.3.70mm65mm65mm60mm1OOkNsm0.06ms5.44kN60mm65mm10A3.LL1L2:L=L1L2L1L2L1lmax+10L2lmin-10lmaxlmin209lmax=428.5mmlmin=327.5mm(2)(3)L1438.5ml2317.5mm3L1=455mmL2=315mmL=L1-L2=455-315=140mmA4.J1(1)J2(2)J2X1(35)X2(46)()X2X1()121mm()J1J2710112mm()X114230X235660:12