thuyet minh.pdf
TRANSCRIPT
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
1/ 82
thuyt minh
bin php t chc thi cng
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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Mc lc
TT Hng mc cng vic T trang
n trang
I Phn I : Tng quan v d n 5 9
1 Tuyn ng v quy m xy dng
2 Qui m cc cu ca d n
II Phn II : Bin php t chc thi cng ng 10 40
1 Cc mi thi cng & ng cng v
2 Vt liu chnh s dng trong thi cng & Ngun gc
3 Thi gian thi cng
4 T chc thi cng cc cng vic chnh phn ng
4.1 Cng tc chun b v huy ng ti hin trng
4.2 Thi cng nn ng
4.2.1 o t nn ng
4.2.2 p nn ng
4.2.3 X l nn t yu
a Kho st xc nh khu vc nn t yu
b Thi cng bc thm
c Thi cng ging ct
4.3 Thi cng mng ng CPD loi II v CPD loi I
4.4 Thi cng mt ng
4.4.1 Thi cng mt ng BTN v lp dm en mng trn
4.4.2 Thi cng mt ng lng nha
4.5 Thi cng h thng thot nc
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
3/ 82
4.5.1 Thi cng cng hp BTCT
4.5.2 Thi cng cng trn
4.6 Cng vic hon thin khc
4.7 My mc thit b ch yu
4.8 Nhn lc phc v thi cng ng
III Phn III : Bin php t chc thi cng cng chui dn sinh
41 51
1 Gii thiu chung
2 B tr thi cng tng th
3 Bin php thi cng tng th
4 Bin php thi cng chi tit cc hng mc
5 Thit b thi cng ch yu
IV Phn IV : Bin php t chc thi cng cu 52 82
1 Tm tt v a hnh khu vc v qui m xy dng 2 cu
2 B tr mt bng thi cng cu vt Vn Lm
3 B tr mt bng thi cng cu vt Chm th
4 Thi cng m tr cc cu
5 Thi cng dm super-T cu Vn Lm
6 Thi cng dm bn hp cu Chm Th
7 Bin php qun l cht lng chung
8 Cng tc an ton trong thi cng
9 Bin php bo v mi trng
10 Bin php m bo giao thng cng cng
V Phn V : Tin thi cng
1 Tin thi cng tng th
2 Biu phn b nhn lc
3 Biu phn b my mc thit b
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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VI Phn VI : bn v t chc thi cng
1 Bn v t chc thi cng ng
2 Bn v t chc thi cng cng chui dn sinh
3 Bn v t chc thi cng cu
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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phn I
tng quan v D N
1. Phm vi gi thu
im u : Km232+000 - Pha Nam ca knh Chnh Ty, ti v tr ln cn vi khu vc cc di tch cha Vn v cha Kh x Lim Tit.
im cui : Km238+200 - Pha Nam, cch Tnh L 9712 hin ti khong 430m, thuc a phn x Lim Thun.
Tng chiu di : L=6216.68m (l trnh c bit ti Km237+1016.68 = Km238+000).
2. Qui m cng trnh
2.1 Phn ng
a) Qui m mt ct ngang :
Phn xe chy (4 ln cao tc) = 2 x 2 x 3.75 = 15.0m Di phn cch gia = 1 x 3.0 = 3.0m Di dng xe khn cp = 2 x 3.0 = 6.0m Di an ton trong = 2 x 1.0 = 2.0m L trng c = 2 x 1.0 = 2.0m Nn ng p d tr = 2 x 3.75 = 7.5m
Tng cng : 35.5m
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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b) Nn ng
Nn ng cao tc. ng dn sinh :
Nn ng p bng vt liu ct cht K=0.95; lp nn thng p bng t cht K=0.98; c x l nn t yu bng ging ct, bc thm, vi a
k thut. dc mI taluy nn p ng cao tc ; dc mI taluy
ng gom v ng dn sinh 1/1.5; Mi taluy nn ng p bng ct
c p bao bng t i v lp t hu c trng c.
Nn ng gom :
Nn ng gom c xy dng bng cng loi vt liu vi ng cao tc (bng ct). Phn l ng v lp di y o ng dy 30cm c p
bng t i vi cht K 0.95. Lp p bao ca ng gom s dng t
dnh tn dng ti ch p.
c) Kt cu mt ng
Mt ng cao tc :
M un n hi yu cu ca kt cu mt ng cao tc Eyc = 1910daN/cm2.
Cu to cc lp mt ng (t trn xung di) nh sau :
BT nha to nhm : 3 cm Ti nha dnh bm : 0.5 Kg/m2 BT nha ht mn : 5 cm Ti nha dnh bm : 0.5 Kg/m2 BT nha ht trung : 7 cm Ti nha dnh bm : 0.5 Kg/m2 dm en : 10 cm Ti nha thm : 1.5 Kg/m2 CPD loi I : 18 cm
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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CPD loi II : 27 cm
Kt cu mt ng dn sinh :
M un n hi yu cu Eyc = 1400daN/cm2. Cu to cc lp mt ng (t trn xung di) nh sau :
BT nha ht trung : 7 cm Ti nha thm : 1.5 Kg/m2 CPD loi I : 18 cm CPD loi II : 18 cm
Kt cu mt ng tnh l 9712 :
M un n hi yu cu Eyc = 1270daN/cm2. Cu to cc lp mt ng (t trn xung di) nh sau :
BT nha ht trung : 7 cm Ti nha thm : 1.5 Kg/m2 CPD loi I : 15 cm CPD loi II : 15 cm
Kt cu mt ng gom :
ng gom c kt cu mt ng cp phi dm lng nha tiu chun theo loi mt ng giao thng nng thng loi A.
Cu to cc lp mt ng (t trn xung di) nh sau :
Lng nha tiu chun : 3 kg/m2 Ti nha thm : 1.5 Kg/m2 CPD loi I : 12 cm CPD loi II : 15 cm
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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d) ng ni v ng gom
ng gom c xy dng ti cc v tr ng cao tc i trng vi cc tuyn ng khu vc v cc v tr cha c ng a phng lin h vi cc cng
chui dn sinh.
Xy dng ng ni chuyn ti lu lng xe c nhu cu lin h gia Quc l 21 vi ng cao tc v v tr nt giao Lim Tuyn.
e) H thng thot nc
H thng thot nc gm thot nc dc, thot nc ngang bng h thng rnh, cc cng thot nc : 7 cng trn ng knh 1.5m; 4 cng trn
ng knh 0.75m; 1 cng hp B x H = (1.5 x 1.5)m; 4 cng hp khu B
x H = (3.0 x 3.65)m.
2.2 Cng chui dn sinh
1 Cng chui Vn Lm-Km232+505, khu BxH = 4 x 3.2m, di 36.4m
2 Cng chui Tri H -Km233+594, khu BxH = 4 x 2.7m, di 48.9m
3 Cng chui X L 2 -Km234+340, khu BxH = 4 x 3.2m, di 46.5m
4 Cng chui s 6-Km234+760, khu BxH = 4 x 2.7m, di 46.0m
5 Cng chui s 7 -Km235+735, khu BxH = 4 x 3.2m, di 35.5m
6 Cng chui Lng Vc -Km236+155, khu BxH = 4 x 2.7m, di 39.6m
7 Cng chui Lng Vi -Km236+990, khu BxH = 4 x 2.7m, di 36.4m
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
9/ 82
2.3 Phn cu
Tn cu L trnh S nhp Chiu
di
(m)
Kt cu
phn
trn
Kt cu
phn
di
Ghi ch
Cu
vt Vn
Lm
Km233+140 8x40m+
1x30m+11x40m
601.5 Super T Mng cc
bng cc
khoan
nhi
D1.5m
Cu vt
trn
ng
cao tc
Cu
vt
Chm
Th
Km237+860 27m+4x33m+27m 193 Dm
bn
Mng cc
bng cc
khoan
nhi
D1.5m
Cu vt
ngang
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
10/ 82
Phn II
Bin php t chc thi cng ng
1 Cc mi thi cng & ng cng v
Cn c vo a hnh v iu kin thc t ca hin trng , cn c vo khi lng cng vic v thi gian hon thnh ca d n c quy nh trong h
s mi u thu, Nh thu d kin t chc cc mi thi cng nh sau :
TT Mi thi cng L trnh Hng thi cng
T n
1 Mi thi cng s 1 Km232+000
(im u
ca gi
thu)
Km233+120
(Cui nt
giao bng
Vn Lm -
Giao Quc
L 21A)
Sau khi hon thnh thi
cng ng cng v s
bt u thi cng t
Km232+000 (u tin gia
ti thi cng m cu vt
Vn Lm)
2 Mi thi cng s 2 Km233+120 Km234+760
(cng chui
dn sinh s
6)
Thi cng t Km233+120
v pha Km234+760
3 Mi thi cng s 3 Km234+760 Km237+780
(v tr tnh l
9712)
Thi cng t Km234+760
v pha Km237+780
4 Mi thi cng s 4 Km237+780 Km238
+200 (im
cui ca gi
Thi cng t Km237+780
v im cui ca gi thu
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
11/ 82
thu)
Nh thu s trin khai mi thi cng s 1 v s 4 trc tin, tip n s trin khai mi cc thi cng s 2 v s 3.
ng cng v phc v thi cng nm v bn tri tuyn, kt cu ng cng v nh sau : p ct n cao +1m so vi mt t thin nhin, p lp
CPD dy 30cm. Phn ng cng v nm ngoi tuyn s c di chuyn
sau khi thi cng xong cng tc p nn ton d n.
Nhng on tuyn c ng gom, b phn p (v trn nhng on tuyn ng cng v i dc theo v tr mi taluy ca ng cao tc), ng cng
v c thi cng theo trnh t sau :
Bm nc, vt bn, o t khng ph hp theo ng trnh t thi cng kt ct ca ng gom, ng chnh tuyn, b phn p. Tin hnh p ct
n cao +1m so vi mt t t nhin, ct c m cht t cht K
=0.95, p lp CPD dy 30cm.
Sau khi d ti tuyn chnh, tin hnh di chuyn lp CPD dy 30cm trn b mt cc on ng cng v, tip tc p nn theo kt ct ca ng gom,
ng chnh tuyn, b phn p.
Nh thu t chc thi cng theo trnh t sau :
Trc tin thi cng ng cng v pha tri tuyn, ti nhng on tuyn c ng gom chy song song vi tuyn chnh Nh thu thi cng ngay ng
gom (n nh cao lp nn thng ca kt cu ng gom) v tn dng
lm ng cng v. i vi nhng on tuyn c xy dng b phn p,
Nh thu tin hnh p ngay kt cu nn ca b phn p (n cao +
1.2m so vi cao nn ng t nhin) v tn dng lm ng cng v.
Pha trn cng ca ng cng v Nh thu tin hnh p lp cp phi
dm vi chiu dy 30cm.
Trn mi mi thi cng, sau khi c ng cng v (cc mi tip theo tip tc thi cng ng cng v) s tin hnh thi cng trn 1/2 chiu rng nn
ng bn trI tuyn, t o c cht sang 1/2 chiu rng nn ng
bn phi tuyn, sau khi thi cng xong bc thm hoc ging ct , p xong
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
12/ 82
cc lp vt liu nn ng theo thit k n cao cht ti, Nh thu tin
hnh p gia ti nn ng bng cch tn dng vt liu o va c cht
ln 1/2 chiu rng nn ng bn phi tuyn.
Cui cng thi cng 1/2 chiu rng nn ng bn phi tuyn, t o ln c cht v pha mi taluy ng cng pha, sau khi thi cng xong bc
thm hoc ging ct , p xong cc lp vt liu nn ng theo thit k n
cao cht ti, Nh thu tin hnh p gia ti nn ng bng cch tn
dng vt liu o va c cht ln chiu rng ca mi taluy bn phi
tuyn.
Sau thi gian ch ln, Nh thu tin hnh d ti, p b ln, di chuyn t tha, ph b ng cng v, tin hnh thi cng cc lp cn li ca kt
cu o ng.
2 Vt liu chnh s dng trong thi cng & Ngun gc
(Bao gm c mt s vt liu chnh thi cng cu)
STT Loi vt t Ni sn xut (Ngun gc)
1 Xi mng Nh my xi mng Hong Thch, Bt Sn
2 Ct vng Vit Tr
3 Ct en Ph L - H Nam
4 t p M Kin Kh - Thanh Lim - H Nam
5 cc loi M Kin Kh - Thanh Lim - H Nam
6 Ph gia Sika nhp ngoi
7 Thp tm Nh my Lin doanh
8 Thp trn Nh my Lin doanh
9 Thp CC 15.2mm Nhp khu Malaysia
10 Neo cc loi Nhp khu t hng OVM - Trung Quc
11 Nha ng Nhp khu t Singapor
12 Ben tont Vit Nam, n
13 Bc thm Nhp khu
14 Khe co gin Nhp khu t hng OVM - Trung Quc
15 Gi cu cc loi Nhp khu t hng OVM - Trung Quc
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
13/ 82
3 Thi gian thi cng
955 ngy l thi gian Nh thu d kin s hon thnh ton b d n (k t ngy khi cng). Thi gian c tnh theo dng lch bao gm c ngy l,
ngy tt, ngh cui tun nhng ngoi tr ngy ngh v nhng trng hp bt
kh khng (bo, lt, ng t,).
4 T chc thi cng cc cng vic chnh phn ng
4.1 Cng tc chun b v huy ng ti hin trng
Bao gm cc ni dung sau:
Thu t ai cn thit cho cng tc xy dng vn phng lm vic, ln tri phc v cho cng tc xy dng.
Huy ng, tp kt my mc thit b v nhn lc
Xy dng cc cng trnh ph tr
Xy dng vn phng hin trng v nh cho Nh thu
Cng tc kho st thit k v lp BV t chc thi cng chi tit
Cc cng vic khc
a) Thu t Nh thu s tinh hnh th tc thu thm t xy dng vn phng lm
vic, ln tri, bi tp kt vt liu v ng cng v ngay sau khi nhn c
quyt nh trng thu t pha Ch u t.
b) Huy ng my mc thit b My mc thit b s c huy ng t nhng cng trnh thi cng xong ,
nh thu s tp kt my mc thit b v xng bo dng chng trong
iu kin vn hnh tt v sau s huy ng my mc thit b n hin
trng.
Ton b my mc thit b cn thit s c huy ng v lp t ti hin trng trc ngy khi cng t nht 1 tun . Trc khi thi cng Nh thu s
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
14/ 82
mi KSTV kim tra v s lng v iu kin vn hnh ca tng my mc
thit b ni trn .
c) Huy ng nhn lc m bo cho cng tc thi cng c trin khai nhanh nht ti hin
trng Nh thu s tin hnh nhanh chng thnh lp Ban iu hnh cng
trng. Ban iu hnh cng trng gm nhng k s c kinh nghim v
nhng nhn vin c chuyn mn cao, sc kho tt.
Lc lng cng nhn k thut :
Nh thu s huy ng ti a lc lng cng nhn lnh ngh, li xe v th vn hnh, nhng ngi c th hon thnh cng vic ca h ti hin trng
mt cch hon ho di s gim st ca K s t vn v s ch dn ca
Ban iu hnh cng trng.
Ngoi ra, nh thu s thu thm lao ng ph thng ti ch thc hin mt vi hng mc cng vic ca gi thu.
d) Xy dng cc cng trnh ph tr m bo cho cng tc thi cng ti hin trng c lin tc Nh thu s
thit lp v xy dng h thng cng trnh ph tr nh sau :
Bi tp kt my mc thit b ti hin trng :
Bi tp kt my mc thit b c t gn ln tri ca cc mi thi cng nhm m bo an ton v thun tin cho cng tc iu hnh cng vic. Bi
tp kt mc mc thit b ch yu tp trung ti cc v tr gn khu vc xy
dng cu vt Vn Lm v cu vt Chm Th.
Trm trn b tng asphalt):
Trm trn b tng asphalt s c t ti v tr gn khu vc xy dng cu vt Chm Th, v tr ny gn Tnh L 9712 nn thun li thun li cho xe
t chuyn ch vt liu qua li, ng thi c th m bo t nh hng nht
n vn v sinh mi trng cho khu vc xung quanh.
Cc vt liu em trn b tng s c th nghim kim tra cht lng ph hp vi tiu chun k thut v c s chp thun ca K s trc khi em
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
15/ 82
trn . Bi tum s c bo qun trong bn cha vi mc ch trnh cho n
khng b nh hng ca iu kin thi tit bn ngoi.
Cc mu hn hp b tng asphalt s c ly nh k kim tra cht lng ph hp vi tiu chun k thut v s chp thun ca K s trc khi vn
chuyn ra hin trng ri.
Trm trn b tng asphalt s c iu hnh bi ngi qun l trm trn b tng asphalt l k s c kinh nghim v c kinh nghim tng t trong
nhng d n khc.
Trm h th in v h thng truyn thng :
Nh thu s lm vic cc c quan chc nng Tnh H Nam xin php s dng in ti trm Bin p Vn Lm II v mt s trm bin th khc trong
phm vi gi thu phc v cho cng tc thi cng v phc v sinh hot cho
K s v cn b cng nhn vin ca Nh thu tham gia thi cng gi thu.
Nhm mc ch m bo vic s dng truyn thng ca K s v Nh thu c lin tctrong giai on thi cng, Nh thu s lin h v lm vic vi c
quan chc nng v truyn thng v trm bu in a phng h cho
php lp t h thng in thoi v fax.
e) Xy dng vn phng hin trng v nh cho nh thu Din tch vn phng : bao gm cc phng lm vic cho Gim c iu
hnh, ph gim c iu hnh, b phn k thut v k hoch, gim c
qun l cht lng, phng hnh chnh Vn phng hin trng v ni
ca nh thu s c cung cp y cc thit b vn phng nh in
thoi , fax, bn , ngh, ti vi, ging ng
Ngoi ra cng b tr Ga ra xe, sn chi th thao. Xy dng ln tri cho tng mi thi cng :
Nh lm vic ca tng mi thi cng trng s bao gm nh lm vic ca ch huy trng, ch huy ph v s c cung cp my b m v in thoi lin
lc ko di phc v truyn thng gia ln tri ca cc mi thi cng v Ban
iu hnh d n.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
16/ 82
Nh thu s xy dng ln tri gn vi v tr ca tng mi thi cng (hoc thu cc nh dn) lm ni n , sinh hot cho cn b cng nhn vin, ngui vn
hnh my mc thit b, nhn cng lnh ngh v lao ng ph thng tham
gia thi cng gi thu.
f) Cng tc kho st thit k v lp BV t chc thi cng chi tit Ngay khi c bn giao hin trng t Ch u t v K s t vn, nh
thu s tin hnh kho st hin trng kim tra cc mc cao , cc
nh ng chuyn v h thng to di s ch dn ca KSTV. Vic ny
bao gm : kim tra cc mc cao , cc nh ng chuyn v v tr cc
cng vic trn tuyn ...
Cn c vo vic kim trra cc mc cao , h thng ng chuyn s c thit lp dc theo hai bn tuyn v ti v tr ca cc cng vic nhm to iu
kin thun li cho cng tc thi cng v kim tra sau ny . Cc mc cao
s c di di ti cc v tr m khng b nh hng bi cng tc thi cng.
H thng cc mc s c thit lp bng b tng v ghi ch trong bnh
ca tuyn ng .
Cc cc mc ca nh ng chuyn tuyn , cc cc tim, cc cc H v cc cc chi tit s c khi phc vi s kt hp ca c quan thit k v s ch
dn ca KSTV . Nh thu s kim tra v so snh v tr ca cc mc v cao
ti cc mc , cc cc v trnh kt qu ti KSTV v sau tin hnh
gi cc (du cc) ti v tr ranh gii (gii hn) ca tuyn ng trn bnh
v ngoi hin trng.
Trn c s cc kt qu o v v kho st a hnh , nh thu s lp bn v thi cng chi tit ca cc cng vic bao gm : Bnh , trc dc, trc ngang
v tng hng mc cng vic , tin thi cng chi tit cho tng hng mc
cng vic v trnh KSTV . m bo ton b cc cng vic s c thi
cng v hon thnh ng thi gian, ngay khi nhn c s chp thun ca
K s TV v bt k cng vic no, nh thu s trin khai thi cng cc hng
mc mt cch nhanh nht.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
17/ 82
g) Cc cng vic khc Ngoi cc cng tc nu trn nh thu s tin hnh mt s cng tc khc
nhm phc v cho cng tc thi cng nh :
Lin h v lm vic vi chnh quyn a phng thu t thit lp vn phng hin trng v ng k s dng ng a phng, b tr ung
trnh, ng vng vn chuyn v thi cng, ng k s lng nhn vin
v nhn cng s hin trng trong thi gian thi cng.
Kim tra cc iu kin v v sinh v iu kin sinh hot ca nhn cng ti hin trng trong thi gian thi cng
4.2 Thi cng nn ng
4.2.1 o t nn ng
Cng vic bao gm o nn thng thng, o b hu c v o t khng thch hp.
Nh thu s thit k trnh t o nhm m bo thun tin cho vic vn hnh v di chuyn ca cc my thi cng trong thi gian o nn ng.
Nhn lc s c Nh thu cung cp y cho cng vic dn dp, m mi cc rnh thot nc b mt v kt hp vi my mc thit b thi cng
m rng cc mng hin c c hai bn ng.
Cng vic c tin hnh nh sau :
Pht quang, o hu c v di chuyn t mt : cng vic ny c thc hin trong phm vi c gii hn trong bn v thit k thi cng.
Pht quang v o b t khng thch hp, ph b v di chuyn cc khi xy, cc kt cu, cc vt cn tr, m m.. v vn chuyn chng t hin
trung ti khu vc bi thi di s ch dn ca KSTV.
trnh KSTV cng ngh o v cc kch thc o cho KSTV. Xc nh din tch c o sao cho trnh c cng trnh ngm nh :
ng dy thng tin, cp quang, cng
Tin hnh o t nn ng theo cng ngh c ph duyt Tin hnh p b theo Tiu chun k thut yu cu.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
18/ 82
Ni dung v trnh t thi cng :
S dng my cao c xc nh gii hn o.
Ln khun nn ng bng h thng cc mc ti cc v tr : nh ta luy nn o, chn ta luy nn o.
S dng my o cao xc nh cao o.
S dng my o kt hp vi my i cho cng tc o lp t mt v chuyn ln t ti v vn chuyn ti khu vc bi thi c KSTV v nh
chc trch a phng chp thun.
S dng my san t hnh v nhn cng san phng t nn c o n cao thit k (ti cc v tr kh thi cng s s dng thm my i loi
nh trong cng tc hon thin nn ng o).
Cng tc lu ln :
Sau khi o ti cao thit k, nn ng s c ti nc ti m thch hp. Trc tin lu s b bng lu bnh thp 6-8T vi qui trnh lu 3-4
lt/im, sau lu bnh thp 10-12T vi qui trnh lu 3-4 lt/im. Trong
qu trnh thi cng quy trnh lu ln s theo s ch dn trc tip ca K s T
vn.
Bi tp kt t thi, rc bn v vt liu khng ph hp :
Vt th rn kh phn hu, rc bn v vt liu khng ph hp s c tp kt v cc bi qui nh ( c s chp thun ca K s t vn v a
phng ni tuyn ng i qua). Cc bi tp kt m bo khng gy ch
tc giao thng hoc lm nh hng mi trng sinh sng ca nhn dn khu
vc xung quanh.
4.2.2 p nn ng
Bin php t chc thi cng di y c Nh thu p dng cho thi cng p nn ng tuyn cao tc, ng gom, b phn p (ngoi tr nhng
qui nh c bit trong khi x l nn t yu, p vt liu h mng cng
trnh s tun theo ch dn ca tiu chun k thut v ch dn trc tip ca
K s t vn).
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
19/ 82
Chun b hin trng thi cng :
Chun b cng a, s thi cng, gii php cng ngh thi cng trnh K s t vn trc khi thi cng.
Dn dp sch s b mt nn o. Ln ga, cm cc nh dng nn ng p.
B tr my mc thit b, nhn lc cn thit.
Vn chuyn vt liu p nn n hin trng. Ni dung thi cng :
S dng my cao c xc nh phm vi thi cng
Ln khun nn ng bng h thng cc mc ti cc v tr : chn ta luy p, tim ng v mp ng .
S dng my o cao xc nh cao p ti tim ng, mp ng sao cho m bo dc ngang ca nn ng, dc ca mi ta luy theo
ng thit k.
i vi mi ngun vt liu p nn, Nh thu s xut k hoch thi cng di m th nghim xc nh dy chuyn thit b thi cng, s hnh trnh
yu cu v phng php iu chnh m. Di th nghim m nn c
chiu rng 10m v chiu di 50m.
Dng t t 10-15 T vn chuyn vt liu hin trng . Nh thu s s dng my i san vt liu p thnh tng lp dy 20 -30cm vi chiu di
100-150m dc theo tuyn ng.
Ln san gt u tin vt liu p nn s c thc hin bng my i kt hp nhn cng san thnh mt lp . Trong thi gian san m ca lp vt
liu p s c hiu chnh ph hp vi m tt c xc nh bng
cch ti nc hoc lm kh nu b m t.
Sau my san s c s dng san gt lp vt liu p nn, to phng v dc mui luyn. Trong thi gian san gt vt liu p s s dng
thm lao ng ph thng (ti nhng v tr cn thit) to khun v to
bng phng ca nn p .
Cng tc m ln s c thc hin bng lu rung 14-25T theo trnh t sau :
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
20/ 82
Lu s b : cho Lu chy khng rung trn cc lp vt liu p t 4 - 6 ln/ im tc lu 1,5 - 2,0 Km/h
Lu hon thin : lu chy ch rung vi s lt lu khong 8 - 10ln/im , tc lu t 2,5 - 4,0 Km/h .
Vi mc ch m bo rng nn p c lu ln t cht thit k, p dng nguyn tc lu nh sau :
Trn ng thng : tin hnh lu t mp ng vo tim ng, Trn ng cong : tin hnh lu t bng ng cong ln lng ng cong .. Nh thu s khng s dng lu rung trong qu trnh lu ln ti cc l trnh c
x l nn t yu bng ging ct.
Kt thc qu trnh lu ln s tin hnh cc th nghim kim tra cht lng ca tng lp vt liu nn p, ph hp tiu chun k thut v di s ch
dn ca KSTV.
Ghi nht k thi cng v lp bin bn nghim thu hng mc, chuyn sang thi cng lp nn p tip theo. Lp tip theo ca nn p s c thi cng
tng t nh th t thi cng nn p nu trn v tip tc cho n cao
thit k.
4.2.3 X l nn t yu
a) Kho st xc nh khu vc nn t yu
Cn c theo bn v thit k thi cng chi tit xc nh ti hin trng cc v tr cn x l nn t yu .
Tin hnh khoan thm d xc nh iu kin a cht cng cc khu vc cn x l t yu bng cm bc thm. X l kt qu khoan a cht.
trnh bin php thi cng, bn v thit k thi cng chi tit.
b) Trnh t thi cng bc thm (PVD)
Di y ch trnh by trnh t thi cng chnh ca cng tc thi cng x l nn t yu bng bc thm (cng tc o t, thi cng vi a k thut, thi cng
lp ct m c xem nh hon tt).
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
21/ 82
Cng tc chun b :
Xc nh chnh xc din tch t yu s x l.
Kim tra li mt bng, bng phng ca b mt lp ct m
Huy ng thit b v nhn lc n hin trng cm bc thm.
Bc thm s c kim tra cht lng ph hp vi tiu chun k thut v c chp thun ca KSTV.
Ni dung thi cng :
My cm bc c a n ng v tr d kin . Nh thu s xc nh im bt u trn trc tm , tnh ton chiu di ca PVD c cm vo lng t
v kim tra bc thm c thng ng hay khng bng qu ri hoc thit b
ph hp vi tiu chun k thut v c ph duyt trong bin php thi
cng.
Bc thm c cun vo tang trng . my cm iu khin a u ca bc thm theo trc n v tr d kin sau neo c nh u bc vi chiu di
np gp nh nht l 30cm v ghm cht xung bng thp.
Sau khi ko trc cm ln > Bc thm s c ct vt khi mt tng m ct 20cm.
Cc v tr cm bc tip theo tin hnh tun t.
Nh thu lp bo co cho din tch oc cm bc trnh KSTV. Sau khi cc min cm bc c chp thun , chuyn sang on tip theo.
p gia ti - Kin tra ln :
Vic gia ti ch ln c kt hp vi cng tc thi cng p nn ng .
Vic t cc thit b o ln oc tin hnh theo cc ch dn ca KSTV. Nh thu s theo di qu trnh ln ghi chp trn biu ln v trnh KSTV.
Cc thit b o ln (Inclinometer, Piezometer, Settlement Cells,) l cc thit b o chuyn dng c mua sm t nh cung cp chnh hiu. m
bo tnh chnh xc ca php o.
Cng tc p t gia ti c tin hnh tng lp ng u vi tc gia ti tnh ton nh trong bn v thit k thi cng chi tit .
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
22/ 82
Vic d ti v thi cng lp cp phi dm loi II ch c thc hin sau khi khng nh chnh xc thi gian tt ln v nhn c ph duyt ca
KSTV.
c) Thi cng ging ct
Di y ch trnh by trnh t thi cng chnh ca cng tc thi cng x l nn t yu bng ging ct (cng tc o t, thi cng vi a k thut, thi cng
lp ct m c xem nh hon tt).
Vt liu :
Ct s dng l ct ht trung phi c kh nng thm nc cao , khng c cht h c, khng ln t, cc cht dc hi khc v gy ra cn tr cho
vic thm nc qua .
Thit b ch yu :
Cn cu 40-50T c lp t ct gi thanh trt ( C th dng my DHP80, cu bnh xch).
Ba rung DZ 45 - DZ90
My pht in 200 KW
My hi p 10m3/ pht
H thng hi p ( Bnh tch kh, h thng ng dn )
My xc gu 0.4-0.8 m3
H thng cp liu
ng vch 400 c chiu di L = 15-25m, dy 12mm Thit b kim tra: dng o mc ct trong ng sau mi chu trnh v khi
lng ct cp cho mt cc (bao gm h thng ng h o v my vi tnh v
v in ra biu ).
Chun b mt bng thi cng :
San i, dn dp mt bng bng thi cng n cao thit k, thi cng lp ct thot nc theo thit k. Lp ct c m ln theo tiu chun k thut
v c k s t vn chp thun mi thi cng ging ct .
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
23/ 82
Tp kt thit b v lp t Cc bc trong cng ngh thi cng ging ct :
Bc 1:
Dng my DHP 80 c lp gi dn hng cu nh v ng vch ng v tr. Lp t ng ba rung DZ 45 - 90 ln nh ng vch. Lc ny di tc dng
ca phn lc t nn van cnh bm u di ng vch ng kn. Sau
3m ct vo trong ng vch .
Buc 2:
Rung h ng vch bng ba rung DZ 45 - 90 Buc 3:
Khi ng vch t cao thit k, cp vt liu ct ( tiu chun) vo lng ng vch qua phu gn thnh bn nh ng vch. Lng ct c
cp trong ng vch ln 2 n chiu cao ct ct H0 = 6.125m (theo tnh
ton) , thc t ly Ho=6.2 m .
Bc 4:
Ko ng vch ln chiu cao h1=3.1m bng ba rung v sc cu. Khi di trng lng ca ct trong ng vch van cnh bm m x ct vo
nn t, trong qu trnh ko ng vch ln ng thi kt hp vi kh nn p
lc 5-7 bar qua ng dn gn u ng vch ct c x vo nn t di
ng vch. Chiu cao ct ct trong ng vch ln kt hp cng vi kh
nn pha trn c vai tr nh mt nt van khng cho kh nn ngc ln
ng vch ( khong 3.1m ).
Bc 5:
Rung v p ng vch i xung mt an bng 2.1m. Lc ny van cnh bm c ng li v ng vch c tc dng truyn lc rung m ct
x xung pha di (c chiu cao 3.1 m). Khi ct c m rng ng
knh v m cht theo thit k.
Bc 6:
Np b xung ct vo ng mt lng 3.1 m ct cho chiu cao ct ct trong ng vch l 6.2 m, rt ng ln 4m kt hp x kh nn (5- 7 bar).
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
24/ 82
Bc 7:
Rung h ng vch xung 2.1m nh bc 5 v qu trnh c i lp li. Sau mi chu trnh ko ng vch ln 3.1m v p ng vch xung 2.1 m li
c thm mt mt di ct c m (ging ct) c ng knh nh yu
cu.
( Ch : 2m cui ca ging ct qu trnh thi cng rt ng vch ln v h ng vch khng th thc hin nh trn m qu thnh ny phi c iu
chnh vi 1 chu trnh ngn hn ) .
Sau khi thi cng xong ging ct, tu theo iu kin c th, Nh thu s tin hnh thi cng p nn ng theo ch dn ca bn v thit k thi cng v
ch dn ca k s t vn. Nh thu s khng s dng lu rung trong qu
trnh lu ln ti cc l trnh c x l nn t yu bng ging ct.
Cng tc kim tra cht lng ging ct c thc hin trn c s kim sot cc
yu t sau:
p lc hn hp kh (nn + ct) m bo t 5- 7 bar .
Chiu su y ng vch trong qu trnh vn hnh rt ng vch ln v rung h ng vch xung.
S thay i chiu su ca ct trong ng vch trong qu trnh rt ng vch ln x ct ra khi ng vch .Qu trnh ny xc nh c lng ct
cn thit c 1m di ging ct .
Dng c o chiu su y ng vch cng nh chiu cao ca ct trong ng vch c gn trn ng vch v ni vi my tnh s chuyn tn hiu ghi
chiu su y ng vch v chiu cao ca ct trong ng vch sau mi chu
trnh , trong sut qu trnh vn hnh ln mn hnh v in ra giy.
Khi kt thc cng vic thi cng cho mi ging ct nh thu phi trnh t vn cc s liu o c bng my c t ng in ra giy v cc s liu v
v tr , ngy , thi gian bt u , thi gian kt thc ca mi ging ct .
Ngoi ra , xc nh c kh nng chu ti ca ging ct theo ch s SPT ca 1 s ging ct , qu trnh ny gi l kim tra ging ct .
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
25/ 82
Cng tc an ton trong thi cng :
m bo an ton lao ng cho ngi phi t chc cho cng nhn hc tp qui trnh cng ngh thi cng , bin php m bo an ton khi lm vic
c th nh :
An ton v in
An ton lm vic trn cao
An ton s dng cn cu, ba rung , my in
Vic ny c kim tra v hng ngy c cn b chuyn trch v an ton trn cng trng .
t nhng v tr thch hp cc bin bo hng dn giao thng, ng i li trong mt bng cng trng, cc li ra vo cng trng v cc khu vc
trong cng trng c ro chn .
Trang b bo h lao ng y v bt buc s dng cc trang b ny khi lm vic . Khi lm m phi b tr y nh sng .
4.3 Thi cng mng ng CPD loi II v CPD loi I
Nguyn tc chung :
Di y ch trnh by bin php t chc thi cng cho lp CPD loi II, lp CPD loi I c thi cng theo trnh t tng t. Trong bt k cc kt cu
mt ng (ng cao tc, ng gom) nu chiu dy lp CPD c
chiu dy 150 mm, Nh thu s tin hnh lu ln ngay, nu chiu dy lp
CPD c chiu dy > 150 mm, Nh thu s chia thnh 2 lp thi cng.
m ca cp phi trc khi v trong qu trinh thi cng lun c Nh thu ch , trong trng hp nu vt liu b kh s c ti b sung bng
xe ti nc chuyn dng, ti nhng v tr kh thi cng s kt hp s dng
thm nhn cng.
Nh thu s dng my ri CPD trong qu trnh thi cng, ngoi tr ti nhng v tr kh thi cng, Nh thu s s dng my san t hnh thay cho
my ri CPD.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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Chun b hin trng thi cng :
trnh K s t vn s v gii php cng ngh thi cng.
Dn dp sch s lng ng. B tr my mc thit b, nhn lc cn thit.
i vi mi loi vt liu v ngun vt liu, Nh thu s tin hnh s dng dy chuyn thit b v trnh t thi cng xy dng mt di m th vi
din tch > 500m2. Cn c kt qu lu ln, cht v cc ch tiu khc ca
di m th, Nh thu s tin hnh trnh cng ngh thi cng chnh thc,
ch sau khi nhn c s ph duyt chnh thc ca KSTV , Nh thu mi p
dng chnh thc trn ton tuyn.
Cng vic ri th c tin hnh di s gim st ca K s T vn (di y l v d v s di m th Nh thu s p dng) :
m khoang 1 m khoang 2 m khoang 3 m khoang 4
Sau khi kt thc cng tc m ln th im, xc nh cht theo phng php rt ct xc nh cht ca tng khoang, bo co cc s liu vi
K s T vn quyt nh s lt lu ln cho hp l.
Qu trnh thi cng :
Trc khi thi cng Nh thu s tin hnh kim tra cp phi, nu thy cha t m s ti thm nc (ti nh v u). Nu cp phi cha
m s tin hnh va ri cp phi va ti nc bng thit b phun nc
chch ln pha trn to ma hoc bng gin phun nc gn trn bnh lu
ca xe lu.
Vt liu c ri thnh tng lp, mi lp c chiu dy trc khi lu ln 15cm, ch sau khi lu ln lp trc t cht yu cu th mi tin hnh
25 m 25 m
25 m
25 m
25 m
100 m
Th nghim cht Th nghim cht Th nghim cht Th nghim cht
10 m
25 m
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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thi cng lp tip theo. Thi cng cun chiu khong 200 - 250m lp mng
CPD loi II th tip tc thi cng lp mng CPD loi I. Khi thi cng lp
mng CPD loi I th phi m bo b mt ca lp mng CPD loi II
m tng tnh ng nht ca lp mng ng.
Cng tc lu ln :
Trc tin dng lu bnh thp 10 - 12T i vi vn tc 1,5-2 Km/h, lu s b 3-4 ln/im.
Tip n dng lu rung bnh thp 14T (rung t 25T) i vi vn tc 2-3 Km/h, lu 8-10 lt/im. Dng lu bnh lp 16T i vi vn tc 3-4 Km/h , lu
20-25 lt/im.
Sau cng dng lu bnh thp 10 - 12T l phng li b mt lp mng ng.
Trong sut qu trnh lu thng xuyn ti nc nh b li phn nc b bay hi.
S ln lu v trnh t s dng lu theo s ch dn trc tip ca K s t vn (cn c trn kt qu ri th nghim nh nu phn trn).
S thi cng lp CPD loi II
S thi cng lp CPD loi I
L=200 - 250m
I III II IV
II IV I III
L=200 - 250m
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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Bin php m bo cht lng thi cng CPD loi I v CPD loi II :
Th nghim kim tra cht lng vt liu cp phi c tin hnh hng ngy ph hp vi tiu chun k thut v chp thun ca KSTV hoc ti bt
k thi im no di s ch dn ca KSTV.
B mt lp CPD loi I v lp CPD loi II s c v sinh sch s v chun b iu kin tt nht.
Chn phng php thi cng thch hp v thi cng trong iu kin thi tit kh ro.
Lp CPD loi I v lp CPD loi II khi hon thin s ph hp v cao , dc, bng phng, tuyn, v cht c xc nh v c s
chp thun ca KSTV.
m bo sai s v cao nh hn sai s cho php . Cht lng b mt c hon thin m bo khng b ng nc.
Bin php kim sot giao thng trn b mt lp CPD loi I v CPD loi II :
Trong khi ang thi cng cha hon thin, Nh thu s khng cho php xe c, k c xe my thi cng ca Nh thu lu thng qua b mt ca lp mng
CPD, ch tr khi c ch dn t pha K s t vn.
B mt lp CPD lun c v sinh sch s, Nh thu s phn lung giao thng v lun hon i v tr ln xe trn mt ct ngang ng xe chy
u trn ton b mt ng.
4.4 Thi cng mt ng
4.4.1 Thi cng mt ng BTN v lp dm en mng trn
Ngay sau khi B giao thng vn ti ban hnh tiu chun thi cng v nghim thu lp b tng nha to nhm (VTO) Nh thu s cp nht v trnh K
s t vn thng qua (sau khi trng thu) bin php t chc thi cng cho
hng mc ny.
Trnh t thi cng chung lp dm en mng trn v cc lp b tng nha mt ng c nhiu im tng t nhau, di y Nh thu trnh by bin
php t chc thi cng lp b tng nha ht trung dy 7cm.
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Cng tc chun b :
trnh KSTV cng ngh thi cng, thnh phn cp phi b tng nha
trnh chng loi v cht lng cc ct liu, nha, ph gia s c dng. Huy ng thit b, nhn lc n cng trng :
Nh thu s huy ng 02 trm trn B tng nha nng (cng sut 100T/h) c bung iu khin v cn t ng n cng trng. 1 trm c t ti v
tr gn khu vc xy dng cu vt Chm Th, trm cn li Nh thu s lm
th tc thu ti v tr nm gn Quc L 21A nhm phc v thi cng on
u tuyn.
Thit b cn o ca trm trn l loi cn tng m. H thng cp nha, tang sy, b sng, thng cha, cc thit b o nhit ... C thit b o v iu
khin t ng thng xuyn c kim tra bi KSTV m bo kim sot
c cht lng v khi lng sn phm.
Thit b vn chuyn: s dng xe t t c bt che m bo nhit BTN.
My ri: Dng 2 chic, loi my ri t hnh c iu khin bng Sensor cm ng m bo vic ri BTN theo chiu dy v dc tnh ton.
Thit b lu ln gm 3 lu / 1dy chuyn ri: Lu nh 6-8 T, Lu bnh lp 11 bnh - 1.5T/1 bnh v Lu 3 bnh thp10T
D kin : 2 dy chuyn ri.
T chc thi cng ri th 1 on trc khi thi cng ng lot nhm rt kinh nghim v hon chnh dy chuyn cng ngh thi cng. Din tch trn
tin hnh ri th c chiu rng c cn c theo ch dn ca K s t vn.
iu kin tin hnh thi cng:
Nh thu s khng tin hnh vic ri b tng nha khi tri c sng m hoc ma.
C ly vn chuyn b tng nha khng qu 45 Km khi tri nng v khng qu 25 Km khi tri rt. Khi tri lnh, c gi mnh, ng xa, s dng bt
che ph gi nhit cho hn hp b tng nha trong qua trnh vn
chuyn.
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Trnh t thi cng :
V sinh b mt lp CPD mng ng :
Dng my nn kh, chi my v nhn cng nu cn thit v sinh b mt cho n khi c chp thun ca KSTV.
Phun ti nha thm :
Dng my thit b lin hp nu v phun nha ti ln b mt ca lp mng CPD mt lng nha thm theo tiu chun k thut sau khi v sinh b
mt.
Chun b iu kin tt cho cng tc ri :
Tin hnh trn hn hp BTN theo tng m trn theo khi lng c tnh ton. Khi lng cho tng m trn v tng xe vn chuyn c lu tr.
Khi ng my ri, vn hnh bng ti v trc i, lm nng thit b ri trc khi ri.
Trc khi vt liu vo phu cn kim tra nhit ca hn hp bng nhit k. Nu nhit khng m bo loi b ngay.
Vn chuyn hn hp b tng nha :
Hn hp b tng nha s c vn chuyn ti cng trng bng cc xe t . Cc thng xe u c ra v lau sch, Nh thu s dng dung dch
hoc cht bi trn qut ln thng xe trc khi vn chuyn.
Mi xe vn chuyn n c giao cho b phn ri bng cc phiu giao nhn c ghi r: thi gian, khi lng v nhit ca hn hp.
Ri hn hp btng nha :
Trc tin cng dy, t cc thanh np nh dng vt ri. S dng loi my ri t hnh, c b phn iu khin vt ri bng cm ng, b tng c ri
theo chiu dy, cao , dc nh trc
My ri di chuyn vi vn tc u trong qu trnh ri.
Cc vt ri kt thc so le nhau khong 5-7m.
X l cc mi ni dc v ngang: Dng my ct b tng ct theo mt thng ng vung gc ht chit dy vt ri theo ng thng gn gng. Theo ch
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dn ca KSTV c th qut b xung ln b mt mi ni mt lng nha dnh
bm hoc dng thit b chuyn dng t nng mi ni
Mi ni dc ca lp trn lch so vi mi ni dc ca lp di khong 15cm. Vi mi ni ngang th khong cch ny ti thiu l 25cm. Lp b tng nha
trn cng th mi ni dc l ng tm phn ln.
nhng v tr m khng th thi cng c bng my ri th tin hnh ri bng phng php th cng.
Trong qu trnh ri Nh thu b tr nhn cng i km theo my ri sa cha nhng khim khuyt nh trn b mt ri.
Cng tc m nn :
Sau khi hn hp dm trn nha huc b tng nha c ri ra, loi b v sa cha nhng v tr khng ng u dng t hp lu: Lu bnh thp 2
bnh 8T, lu thp 3 bnh 10-12T, Lu bnh lp 11 bnh p lc mi bnh 1,5T
lu ln hn hp. Cc lu chy ngay sau my ri v song song vi tim
ng tr khi x l cc mi ni ngang.
Phng php lu ln nh thu trnh KSTV thng qua :
Giai on u dng lu 2 bnh thp lu ngay sau my ri chng 10 pht.
Tip sau dng lu bnh lp lu trong 10 pht
Cui cng lu 3 bnh thp lu khong 25 pht
Ban u bnh lu c v sinh sch. Trng qu trnh lu bnh lu c lm m bng phun nc u vo bnh lu.
Cc lu chy vi tc u, khng lu trn b mt rI, cc vt bnh lu chng ln nhau bng 1/2 chiu rng bnh lu. Cc giai on lu lm sao cho
ht cc vt ln trn b mt b tng nha.
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5-7m
Th t vt ri
tim ng
I
III V
II
IV
VI
Cng tc th nghim v nghim thu:
Nh thu s trnh KSTV cc mu th v cc kt qu th nghim mu hng ngy ngay sau khi ri. Mi thay i u c KSTV thng qua.
o c cc kch thc hnh hc, khoan mu xc nh cc ch tiu ca lp b tng nha, nh gi cht lng b mt c tin hnh theo ch dn ca
KSTV.
m bo cht lng:
Cng tc chn vt liu v thit k hn hp: Nh thu s lp mt s phng n trnh KSTV ph duyt cng thc hn hp, t chn ra cng thc
ph hp nht.
Trn hn hp BTN theo tng m trn vi cng xut (tc ) tnh ton. Cc thng s ca cng tc trn lun c gi n nh m bo tnh ng u
ca BTN - La chn trnh t vt ri v chiu di vt ri thch hp. Phun ti
nha bng thit b phun t hnh m bo ng u, ph kn ng lng
tnh ton.
My ri vn hnh vi tc thch hp khng gy hin tng nt b mt hoc khng u. Cc li nh c sa cha ngay bng thu cng trc khi
lu ln. Kim sot nhit ri ph hp. Tuyt i khng ri khi c ma
Cc mi ni dc v ngang trn cc lp k tip nhau phi t lch nhau. v phi m bo thng. Cc mi ni dc c tnh ton sao cho ng v tr
phn gii gia cc ln xe.
Trong qu trnh ri vic kim sot m bo chiu dy, cao v dc c tin hnh thng xuyn.
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Tin hnh ly cc mu th thng xuyn c nhng iu chnh kp thi v kim sot cht lng BTN.
Nghim thu cng tc ri theo tng lp bao gm vic o c cc kch thc v khoan mu BTN v tin hnh th nghim di s ch dn ca KSTV.
4.4.2 Thi cng mt ng lng nha tiu chun 3Kg/m2
Cng tc chun b :
trnh K s t vn s v gii php cng ngh thi cng.
Dn dp sch s lng ng. Qut chi, thi (bng hi p) sch mt ng dm tiu chun. Phm vi lm sch mt ng phi rng hn phm vi s
ti nha l 0,20m dc theo hai mp.
Huy ng my mc thit b, vn chuyn vt liu n chn cng trnh.
T chc thi cng th mt on ng trc khi tin hnh thi cng ng lot. on ri th c chiu rng l ton b chiu rng ca ng v chiu di
dc theo tim ng l 100m. Cng vic ri th c tin hnh theo s ch
dn ca K s t vn.
Trnh t thi cng :
Cng dy, vch mc hoc t cc du lm c cho li xe ti nha thy r phm vi cn phun nha trong mi lt (tng cng 3 lt).
Trong khong 2-3 ngy trc khi thi cng lp lng mt (hoc 4-5 gi trc khi lm lp lng mt trong trng hp thi tit xu) ti lp nha thm
bm theo tiu chun 1.5Kg/m2.
Phun ti nha nng ln th nht vi tiu chun 1,8Kg/m2.
Ri ngay c kch c 10/16 vi tiu chun 14-16 lt/m2.
Tin hnh lu ln bng lu bnh thp 6-8T, tc cc lt lu u l 2Km/h, sau tng dn ln 5Km/h, tng s lt lu l 6-8 ln/im. Khi thy hin tng
v s dng lu ngay.
Phun ti nha nng ln th hai vi tiu chun 1,2Kg/m2.
Ri ngay c kch c 5/10 vi tiu chun 10-12lt/m2.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
34/ 82
Tin hnh lu ln bng lu bnh thp 6-8T, tc cc lt lu u l 2Km/h, sau tng dn ln 5Km/h, tng s lt lu l 6-8 ln/im. Khi thy hin tng
v s dng lu ngay.
Bo dng mt ng lng nha trong vng 15 ngy. Mt ng lng nha sau khi thi cng xong c th cho thng xe ngay. Trong 2 ngy u hn ch
tc xe khng qu 10Km/h v khng qu 20Km/h trong vng 7-10 ngy
sau khi thi cng. Trong thi gian ny nn t cc ba-rie trn mt ng
iu chnh xe t chy u khp trn mt ng ng thi hn ch tc
xe.
Yu cu trong qu trnh phun ti nha nng v ri :
Phun ti nha nng :
Nha phun ra mt ng phi u, kn mt. Tc xe ti nha 5-7Km/h.
Nhng on dc > 4%, xe phun nha i t di ln dc nha khi chy dn xung.
Khi gp tri ma phi dng ngay vic phun ti nha.
Nha c phun ti cc lt sau (lt 2,3) phi c ti so le cc mi ni ngang v dc so vi lt ti trc.
Ri :
c ri bng thit b ri mc sau thng xe t. Vic ri c tin hnh ngay sau khi ti nha nng.
Xe t phi i li bnh xe khng b dnh nha.
nh phi c ri u khp trn phn mt ng c phun ti nha nng. Trong mt lt ri cc vin phi nm st nhau, che kn mt
nha nhng khng nm chng ln nhau.
Vic b ph nhng ch thiu, qut b nhng ch tha v nhng vin nm chng ln nhau phi c tin hnh ngay trong lc thit b ri
ang hot ng v kt thc trong cc lt lu ln u tin.
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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4.5 Thi cng h thng thot nc
4.5.1 Thi cng cc cng hp BTCT
Cng tc chun b :
Thit k thnh phn BTXM. trnh KSTV cc mu vt liu, thit k hn hp.
Huy ng my mc thit b v nhn lc cn thit
Xng ch to ct thp.
B ct pha chuyn dng
B m b tng chuyn dng
Trnh t chung cc bc thi cng (cc bc thi cng chi tit xem ti phn
bn v t chc thi cng cc trang sau) :
o c xc nh v tr t cng :
Xc nh v tr thi cng cng trn thc a
o t h mng i vi phn sn cng :
ng cc tre D6-8cm, 25cc /m2
Thi cng lp ct en m u cc dy 10cm
Thi cng lp dm lt dy 10cm
Thi cng lp BT sn cng
Thi cng tng cnh cng i vi phn thn cng :
ng cc BTCT 30 x 30
Thi cng lp BT m dy 15cm
Thi cng bn y cng hp
Lp dng vn khun, lp dng ct thp thn cng
b tng thn cng bng bm b tng (chia lm 2 ln )
m b tng bng m di hoc m cnh
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D n xy dng ng cao tc Cu gi ninh bnh (giai on 1) Gi thu XL s 4 : Km232+000 Km238+200
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Lp dng ct thp sn cng, lp vn khun sn cng
b tng sn cng bng bm b tng
m b tng sn cng bng m bn v m di
Bo dng b tng sn bng bao ti v ct m p vt liu mang cng v thi cng bn qu :
p t tng lp 15-20cm , m cht theo trnh t cng tc p nn (phn gn st tng cng s dng m cc v tun theo ch dn ca tiu chun
k thut) . Tin hnh p u hai bn thn cng.
Vn chuyn t tha ra bi thi m bo cht lng :
Thp, Xi mng c nhp trc tip t nh sn xut chnh hiu c chng ch cht lng.
S dng ngun nc sch , khng ln tp cht hu c trn b tng.
Tnh chnh xc khi lp t ct thp , ct pha. Kim tra bng thc thp lin tc ti hin trng.
b tng theo trnh t t xa li gn. Thi cng dt Im tng hng mc m bo tnh lin tc cho btng.
Thng xuyn ch mu v th nghim b tng theo ch dn ca KSTV.
4.5.2 Thi cng cc cng trn Cng ngh thi cng cng trn nhn chung khng phc tp bng cng ngh
thi cng cng chui dn sinh v cc cng hp, y Nh thu ch trnh by
cc bc thi cng chnh.
Trnh t chung cc bc thi cng nh sau :
o h mng bng my o kt hp nhn cng
ng cc tre, L=2.5m, mt 25cc /m2
Thi cng lp dm m dy 10cm
Cc khi ng cng c c sn cc bi phng . Lp t khi vo v tr bng cu nh hoc xe ti