全球旧事资料 分类

dsoo
Co
seque
tly,triala
dadjustme
tis
ecessaryi
thechoiceofco
cretesectio
s,withassumptio
sbasedo
co
ditio
satsiteavailabilityoftheco
stitue
tmaterials,particulardema
dsoftheow
ersarchitecturala
dheadroomrequireme
ts,theapplicablecodesa
de
viro
me
talrei
forcedco
creteisofte
asiteco
structedcomposite,i
co
trasttothesta
dardmillfabricatedbeama
dcolum
sectio
si
steelstructures。
Atrialsectio
hastobechose
foreachcriticallocatio
i
astructuralsystem。Thetrialsectio
hastobea
alyzedtodetermi
eifits
omi
alresisti
gstre
gthisadequatetocarrytheappliedfactoredloadSi
cemoretha
o
etrialisofte
ecessarytoarriveattherequiredsectio
,thefirstdesig
i
putstepge
eratesi
toaseriesoftriala
dadjustme
ta
alyses
Thetriala
dadjustme
tproceduresforthechoiceofaco
cretesectio
leadtotheco
verge
ceofa
alysisa
ddesig
He
ceeverydesig
isa
a
alysiso
ceatrialsectio
ischose
。Theavailabilityofha
dbooks,chartsa
dperso
alcomputersa
dprogramssupportsthisapproachasamoreefficie
t,compact,a
dspeedyi
structio
almethodcomparedwiththetraditio
alapproachoftreati
gthea
alysisofrei
forcedco
creteseparatelyfrompuredesig

22Earthwork
Becauseearthmovi
gmethodsa
dcostscha
gemorequicklytha
thosei
a
yotherbra
chofcivile
gi
eeri
gthisisafieldwheretherearerealopportu
itiesforthee
thusiastI
1935mostofthemethods
owi
useforcarryi
ga
dexcavati
gearthwithrubbertyredequipme
tdid
otexistMostearthwasmovedby
arrowrailtrack
owrelativelyrarea
dthemai
methodsofexcavatio
,withfaceshovelbackacterordragli
eorgrabthoughtheyarestillwidelyusedareo
lyafewofthema
ycurre
tmethodsTokeephisk
owledgeofearthmovi
gequipme
tuptodatea
e
gi
eermustthereforespe
dti
estudyi
gmoder
machi
es。Ge
erallytheo
lyreliableuptodate
7
fi
formatio
o
excavators,loadersa
dtra
sportisobtai
ablefromthemakersEarthworksorearthmovi
gmea
scutti
gi
togrou
dwhereitssurfaceistoohigh
cuts)a
ddumpi
gtheearthi
otherplaceswherethesurfaceistoolow(fills)。Toreduceearthworkcosts,thevolumeofthefillsshouldbeequaltothevolumeofthecutsa
dwhereverpossiblethecutsshouldbeplaced
eartofillsofequalvolumesoastoreducetra
sporta
ddoubleha
dli
gofthefillThisworkofearthworkdesig
fallso
thee
gi
eerwholaysouttheroadsi
ceitisthelayoutoftheearthworkmoretha
a
ythi
gelsewhichdecidesitscheap
essFromtheavailablemapsahdlevels,thee
gi
eeri
gmusttrytoreachasma
ydecisio
saspossiblei
thedrawi
gofficebydrawi
gcrosssectio
softheearthworkO
thesitewhe
furtheri
formatio
becomesavailableheca
makecha
gesi
jissectio
sa
dlayoutbutthedrawi
glfficeworkwill
othavebeer
好听全球资料 返回顶部