Binh rld tuyen dudng : lh hinh chidu cua... Nguy0n tirc vach v aurr tuve-tuyen : rrach tuyin thdng, cttran thang quii dai > 3km.. Dac tinh cua tuydn ly thuydt : ld tuydn c5 d0 ddc doc k
Trang 1Phdn ba
THIET xfl rirun ud, m[r cflr ogc uA m[r cfir ucnuc 0U0NG 0I0
Chuong I THlflr KgTUvE'r.r TREIU BiNH
3.1.1 KHAI tqlEru cHUNG va uHt]ruc rucuvEn rAc co eANt
A Binh rld tuyen dudng : lh hinh chidu cua <ludng trOn mdt phing nam ngang" Gdn 3 ydu to chinh cua tuyen tren binh dd le doan thing, doan dubng cong trbn vi
cloan <Iudng cong chuydn tiep noi cloan thing r,<,i doan dudng cong trbn
l Dim bio crlc ydu td cua tuydn nhu biin kinh toi thidu dudng cong nlm, chidu dhi clud'ng cong chuyen tidp, <IQ ddc doc max ciia dudng khi tridn tuyen, r'.v khong vi
ph4rn nhCrng quy dinh vd tri so gi6i han doi v6i cap dudng thidt kd
.6rn rheo hinh dang dia hinh dd khdi luong ddo, dap nh6 nhat, bao ve dutJc canh quan thi6n nhiCIn
3 Dim bAo su hhi hba, ph6i hgp gifia dudng vd crlnh quan'
4.Xdt yeu td tArn l;i ngudi liii xe vh hhnh khrich di tren dudng' khong
gay budn ngu cloi v6i 16i xe, ban c10m cldn pha 6tO llm ch6i m6t xe di nguoc
S C6 g6ng su dung ciic tiOu chudn hinh hac cao nhu b6n kinh dudng cong, chidu dAi dudng cong chuydn tidp trong ditiu kiOn dia hinh cho ph6p'
6 Dim bio tuydn lh m6t dudng khong gian ddu df,n, 0m diu, tron hinh ph6i canh
tuydn kh6ng bi b6p m6o hay gdy khric Mu6n vty phrli phdi hgp hli hba g\itac'6c yeu td
,uyAn tren iinh Od, m4t c6t ngang, mat c6t doc vi giita cdc ydu to dr5 v6i dia hinh xung
qrun'h (xern thiet kd canh quan dudng 6t6 - chuong 5 - Phdn ba)
7 Tr6nh ciic virng dat yeu, ddt sut ; doi v6i dudng cap cao tr6nh tuyen chay qua khu
ctan cLr.
8 Phii phdi
quarl vilng tuyen
chuclng "I.'hiet ke
a\
DO
nCIn thiit kd
canh gL'6Lc vil
chidu
chay qua Cric hudng cl6n vd yeu cdu ndy c6 thd tham khiio trong
cinh quan dudng 6t6 - Chuong 5 - Phdn ba"'
71:)
Trang 2I (i {
3'1 "2' oac orErvl KHI vacH ruyEN 6 cac DrA HINH
KHAC NHAU
A" Vilng ddng bang
l Dac cliern : DQ cloc
cf ia Irinh nho (i < 2To + 3Vo).
2 Nguy0n tirc vach v aurr tuve-tuyen
: rrach tuyin thdng,
cttran thang quii dai (> 3km) co the trrav nhil,,-, tr,!,.\ '^
nh0ng
thing nhy bxng c,6,c dulng
cong co
+ 15000m cldi r,6i ctulng
cao toc.
\2 ;rrn/ Uo the thay nhfng
cloan
l,:,.:.-,11,1r* u9, vcvi cluo,g Lruuug oro ttrong trrudne oro illong thudng vd vdr 50or5000
"l'.einh clirng
goc chuy.n truong nho.
B Ving ddi cao vd nrii
uru* 'ac didm : Do doc dia hinh kin hon do cloc gidi han (i,,,,*) quy
dinh d6i v6r c6c c{p
'en .sudn doc dd tranh thu ,uot cao d6 Tan
dung dia hinrr nhu ddo thap oJ r,r-'rrr6ir qua crdi hoac
thoii, thung rnng doc ,n.o'run, ,u, ;;;,ffi;;;id; ddo ddp
horc kd chin v.v
Dac bi6t chri .i phoi ho p thidt kd
binh dd, mat cdt doc vi mar cdt ngang dulng.
C Vilng ddi thoei : Nguy€n
t6c vach ruydn nhu doi ,
-,r,?;1il""_'g ph6p vach tuv6h ven sudn ddc c6
d6 ddc dia hinh t6n hon dd ddc
Giai thidt binh dd c6 tli lo I : 20'000, khoring ciich
ch€nh cao giffa 2 crudng ddng
mric
kd ,hau lI 20m' ra mudn v4ch mQr ruyen ly thuyet c5 d6 croc
i = 0,05
De vuot d6 ch6nh.clo.eifra 2 dudng ddng
mrlc li 20m vdi cro doc dudng 57oth\chidu
dii cua tuyd, rren binh
oo ra zo
' ,,;;'= 400m r,) rr6n bdn dd ri le I : ZO.OOO s6 rd 2cm
Nhu'ay' dd vach ruydn
ry thuydt
";;; ra thudng oor*
""*oa vdi budc compa rd 2cm vi
xiic dinh vi trf tuven lf rhuyci nhu chi d6n tren nr* ,.r , iirarg cd n6t uo, _1
180
160
,20 I
' ='
,I, 2oorcro = o o2n = 2cm
Hinh 3'1 '1' cSch x6c dinh tuyen rli thuyet,
3 ('d,
ncn kja u
' a hat hu, ,
Cric d:
"hdc nhr u
':-sTKO
144
Trang 3cOng thuc xiic dinh chidu diri buoc compa t :
trong d6 : f - chidu ddi budc colnpa, cm ;
h - dQ chOnh cao gifra 2 duong ddng mfc kd nhau, m ;
i - d6 doc doc ctla ruyin l! thuyet :
M - ri lobrin dd
Dac tinh cua tuydn ly thuydt : ld tuydn c5 d0 ddc doc khong thay dcii i ; do d6 doc
doc cfra tuyen kh6ng thay ddi nOn khdi luong d]o, dip s6 nho nhdt vi dudng d6 thudng song song vdi dudng den
Ciic doan dudng c5 khoang c6,ch (, < I sE c5 d6 ddc doc nho hon d6 doc tfnh to6n i r'i nguoc lai
nhidu cludng cong vd vi vay neu biim theo tuyen lf thuydt dudng s6 quanh co
tuyen li thuydt nhurrg tlng chi6u dii gifra cr{c dinh chuydn hu6ng, giim s6 lugng ducrng cong (n6t lidn tr0n hinh 3.1.2) D6 doc doc cria tuydn ndy l6n hcrr d6 ddc dDng Od vC tuydn
lf thuyet mot it vi dI thay ciic doan gay khric blng c6c doan thing dei Vi ly do tren, khi
xiic dinh bu6c compa I dI ldy i nho hon i*,,, quy dinh doi v6i cap dudng thiet kd m6r ir
240
220 200
180 160 140
120
100
BO
Hinh 3.1.2 CSch vach tuydn ven suon ddc.
- tuydn ly thuydt c6 i = const ;
tuydn thrrc t5.
3 C6c tliim khdng che khi vach tuy6n : Dbo ld noi thdp nhdt dd vucrt sang phia
ben kia cua d6i, nrii Cdu vuot song ldn li vi tri cdu cdn duoc chon tru6c khi vach tuydn
vd b6t bu6c tuyen phri,i di qua
Cric didm khdng che kh6c md trong quy hoach tdng thd dd, x6+c dinh vi cr{c lf do kh6c nhau