1.kn ve cau truc(cac thong so kt hoac dac tinh ki thuat)

2.cac loai can truc dung trong l/g?

3.can truc thap?

4.chon can truc l/g?

5.chon can truc thap?

6.cac tbi phuc vu l/g?(day cap,day cau,puly,dong doc,toi)?

7.cac cong cu neo giu?

8.cong nghe cac qua trinh chuan bi l/g?

9.cac Phuong phap chuan bi mong cot thep?

10.l/g cot thep?

11.l/g dan vi keo thep?

12.lg mong BTCT?

13.l/g cot BTCT?

Bai lam**************************

CAU1:k/n ve cau truc?

Moi loai CAu truc co 1 bieu do tinh nang khac nhau,tinh nang cua can truc gom cac thong so sau:

-suc truc Q;Qmax->Rmin va nguoc lai.

-chieu cao nang moc cau H:Hmax->Rmin va ngc lai

-do vuon tay cam R:Rmax->Qmin

-chieu dai tay can L

-30<α<75 do

(ve hinh minh hoa.ghi cac thong sova ve bieu do,truc ngang lla R.Truc dung la Q roi ve 2 duong do thibieu thi"Do vuon cua can truc")

CAU2:Cac loai can truc dung trong l/gg?

A-Can truc tu hanh:gom

1.can truc oto co:Q=3-16t.L=22m,R=15-25m,H=25-30m .toc do di chuyen lon 30km/h.

Pham vi ap dung:dung de l/g trong cong truong

2.can truc banh xich:Qmax len toi 160T.Hmax=50-60m.Lmax=50-80m.Rmax=30-40-50m

Ddiem:phai dung xa cong trinh do α be.khi tam voi xa va cao thi them mo phu co l=3-10m(ve hinh)

Khi do Q1<Q, L1=Lm*cos beta, H1>H, R1>R

3-Can truc banh hoi:Q-128t, H=70m, R=60m, L=60-70m

B-Can tuc thap:

1-can truc thap co doi trong thap(chay tren ray) KB100:

Q=5-50t, H=70m, R=60m. (ve hinh chu y doi trong o duoi ,gan may)

2-can truc dung yen 1 cho.(doi trong o tren cao):

Q=3-10t,H=150m, R=75m(ve hinh doi trong o tren cao(ngay duoi cho nguoi ngoi dieu khien)

3-cac loai can truc khac:can truc thieu nhi. Can truc cot buon.can truc cong(chan de) chay tren ray,loai nay co Q-200-300T,H-50-60m,L=30-70m dung de l/g nha cao tang.va can truc duong sat....

CAU4.CHON CAN TRUC L/G?(ve hinh)

1-can truc l/g kc ko co vat can phia trc.chieu cao nang moc cau Hm tinh theo cong thuc:Hm= h1+h2+h3

trong do: h1=Hl+(0.5-1)m -chieu cao nang cau kien hon cao trinh may dung.

h2-chieu cao cua ck l/g (m)

h3-chieu cao cua tbi treo buoc tinh tu diemcao naht ca ck toi moc cau cua can truc

h4-doan puli.dong doc dau can-1.5m.

+ chieu cao tu cao trinh may dung den puli dau can truc la:H=Hm+h4

+ Q=Qck + q(tb)

+Lmin= (H-hc)chia cho sin (anfa max),hc=1.5-1.7m-chieu cao cua can truc

+Rmin=Lcos anfa max + r ,r =1-1.5m khoang cach tu khop cua can truc den tam may, anfa=70-75 do.

2-TH l/g kc co vat an ngu phia trc. Hm=h1+h2+h3+Hl ,Hl la chieu cao vat an ngu(ngoi nha...).

CAU5-Cchon can truc THAP?(ve hinh)

Chu y:1can truc thap chay tren ray Ryc= a+b. b>= r+0.8m

2.can truc thapkhi chua lap ho mong: b>=0.8+ Hcotg(anfa) +3+ A:2.

CAU6-Cac tbi phuc vu l/g?

1-day cap: a/khai niem: gom cac soi day co duong kinh tu 0.2-2mm.cac soi nay buoc thanh 6 tumva 19-37 soi tren 1 tum,co tu 114-222soi tren1 buoc ben.sxuat d=3.7-65mm,l=250-1000m,

-cap gom cap mem va cap cung(van xuoi va van nguoc....)

b/tinh toan suc cang cua cap: Stt= R chia K,voi R la luc cang dut cap,K la h/s an toan.,STT la suc cang tinh toan cua cap.

c/tinh toan suc cang cua cap khi treo buoc k/c:R=K nhan S- tra bang- chon d cap-co bang chon so bo...

2-day cau:la 1 doan cap gom day cau don va day cau kep,va 4 day de cau panel.( ve hinh minh hoa) co ca Don treo.,gian treo.

3-Puli.gom Puli co dinh.di dong,va huong dong.(ve hinh minh hoa)

4.Rong roc.la hop cua pu li co dinh+puli di dong+puli huong dong(ve hinh minh hoa)

Stt=Q chia n-so nhanh day treo vat.

Suc keo tay toi :St= Q chia m-he so ma sat giua banh xe va PUli

Tong chieu dai doan day:L= n(H+3D) +l+10-15 m,m va n tra bang.

5.TOI.la1 tbi tao luc cua may gom:toi tay Q= 0.5-5T,va toi may voi Q=5-100t

CAU7:cac cong cu neo giu?nhieu cong thuc SGK.

CAU8:CONG nghe cac qua trinh chuan bi l/g?

1-v/c ck:-v/c bang oto gom ck chiu uon dau thua nho hon 01l va ck chiu nendau thua la 0.21l.(ve hinh)

2-xep kho ck:.........

3-khuyech dai ck:........

4-Gia cuong ck:........

CAU9: L/G cac KC thep?

1-Cac pp chuan bi mong cot thep: (ppTC mong cho cot thep) co 3 cach co ban:

Pp1-TC Be tong 1dot den ngay cot thiet ke (ve hinh).UD TC don gian(1 lan do BT),nd KHO GIA CONG COT,KHO DE TRUC CUA COT VUONG GOC VOI TAM DE.

Pp2-TC be tong lam 2 dot(pp co xong tua). TC bt mong den cach cot thiet ke5-6cm.trong mong dat 1 xong tua = kl la thep hinh.sau kho l/g cot xong moi chenbt lan 2 vao phan mong chan cot.

2-L/G cot thep:co 4 bc khi l/g 1 cau kien co ban nhu sau:

B1-cong tac chuan bi l/g gom: diem dat l/g kc,ktr tim,cot.Voi kc l/g thi :kt kich thuoc k/c,ktra moi han, chi tiet cho lo bulong,vach tim ck.

B2-Treo buoc cau lap kc( dung cu,tbi va cach treo buoc).

B3- dieu chinh co dinh tam KC

B4 lien ket han(co dinh vinh vien k/c).

TU do suy ra cach l/g cac kc btct duc san nhu: mong btct,cot BTCT,Dan cau chay BTCT,panel mai btct...

CAU 10-11-12-13 nhu tren

Cau 14:LAP DUNG cac ctr cao DANG THAP?

A/ lap dung cot dien cao the:dd-chieu cao cot dien len den 60-70m.nhung cot dien vuot song len den 100-180m..thuong lam bang btct hoac thep.

Lap dung cot nang duoi 10t, cao duoi 20m thi dung toi,to,pa lang va gia3 chan.bang can truc banh xich hoac thu cong.

Truong hop d/k mat bang hep co the lap dung cot dien theo hai pp sau:

-pp1:dung 1 cot phu o trong cot dien va neo giang cot do bang 2 day o chan de cot dien.sau khi nang cot len phai giu cot khoi lat nhanhbang 1 day ham buoc vao may keo.

Luc nen xd theo ct: aQ cong bScos beta bang0 suy ra S=... Trong do S:luc nen trong cot phu.beta: goc gua duong thang dung va cot phu.

-pp2:dung cot dien bang 1 cot chong xien,chay truot tren mat dat........

B/Lap dung cot vo tuyen dien.........