4 .I - 0 I 3 2 1 O 8 8 . 1 ./' I 1 qlrj -X- t / i \. / d +- I 4 ~~~29 5% T~NG 4 +- '? C& TH&~H~EHTH~C(C[W.I 0 ~.4-30: SEN NAM CAC ~oai -oAL c&- / *-N B.TC.T~ HUH TH~C @ IAN M+T ti% DAG H. 4-31 7 BAN DAG @ @ S* nni ti+ GG ~h : KHOANG cdc~ DZ~JI a - DAM CH~&H C : C~T hi IGG b- DZM PHU b: ~I%NGANGDF.G L:NY~PCGT -t- i. 4 I H. 4-32 SEN t5T.C.T &. e- @. &.VU&NG I 'I @ S, QUATMM + I I ut 6.00 . 0.00 &.a* -4-2 -4- ~.4-33 AN 8.~~5, B.T.C.T L% GHEP a a. &AN. BT.C.T LA& G~&P b. BE. TON N 4- L& 7~2% c . L+ d~ S<:N e, ~6' CU~N MI& SAW [...]... x5y bhng gach c6 th6 dgt n&mvi&ngacl~, nhuhg n&nd$t nghi&ngvi&n gach dd tao b$c t r h kh6i nn&n bEtdng b- Bgc thang b5ng dh d'dc gia cdng dd c6 ti6t dien the0 hi1111 ch13 nh$t hoac hi1111 da gihc mot kh6i hay 2 nhhnh vdi mui b$c nhd ra t13 2 - 4cm, cao 4 - 6cin Ngoii ra c611 c6 nh3ng b@cthang bhng dh d ~ g dgo got the0 hinh thdc dac biet d6 xAy cAu thang c6 c th$n thang tron hay xoiin trbn 6c (H6-27)... dung giAi phlip n6i bang cach dgt lib11 ddu v6i tdin che m6i n6i duqc lien k6t 11an hogc dinh tan 3.2- Libn ke't clgm thai~g vao dgm chi& nghi : Dim clli6'u nghi thu.trng dugc ghep bsng 2 thep hinll cl13 I, U Din1 thailg duf~; lien kdt vio dAm cl~idu~ bang nghi bulon v i thdp hinh ch6 L vdi nh . thang b5ng dh d'dc gia cdng dd c6 ti6t dien the0 hi1111 ch13 nh$t hoac hi1111 da gihc mot kh6i hay 2 nhhnh vdi mui b$c nhd ra t13 2 - 4cm, cao 4 - 6cin. Ngoii ra c611 c6 nh3ng b@c. dinh, troilg 3 cach thi thd 2 va 3 dat y6u ciu hbn. Mui b$c bao dam nh6 ra 4 - 5cm. (H6-13a.b) 0 noi thu'dng dm uirt, bac khdi hinh cua cAu thang g6 n6n xAy bbng gach da hay b$tbng. thai~g vao dgm chi& nghi : Dim clli6'u nghi thu.trng dugc ghep bsng 2 thep hinll cl13 I, U. Din1 thailg duf~; lien kdt vio dAm cl~idu~ nghi bang I bulon vi thdp hinh ch6 L vdi