:
=5,33 ;
() n = 965 /;
i..= 2,7;
e = 0,015.
1. (. 1)
.= 5,33 n= 965 / .
2.
:
(. .2.20);.
d1=140 .
3. ,
d2= i. ×d1(1-e) = 2,7 × 140 ×(1 0,015) = 372 .
(. . 2.20):
d2 = 380 .
5.
i = d2 / d1(1 e) = 380/140 × (1 0,015) =2,67.
:
w1=w / i = 101 / 2,67 = 37,8 /.
:
(37,8 37,5) × 100 / 37,5 = 0,8%, ( 3%
,
d1= 140 ;
d2=380 .
6. :
amin=0,55(d1+ d2)+0 = 0,55(140 + 380) + 10,5 = 296,5 ;
amax= d1+ d2 = 140 + 380 = 520 ,
= 10,5 ( , . .2.19)
500 .
7. :
L=2a+0,5π(d1+ d2)+ (d2 d1)2/4a =
= 2 × 500 + 0,5 × 3,14 × (140 + 380) + (380 140)2/4 × 500 = 1845,2 .
(. . .2.19):
L = 1800 .
8. L= 1800 :
w=0,5p (d1+ d2) = 0,5 ∙ 3,14 ∙ (140 + 380) = 816,4 ,
y=(d2d1)2 = (380 140)2 = 57600 ;
9. :
a1= 18057 × (d2-d1)/ = 151,3.
10. , . . 2.22, =1,0.
11. , , . . 2.21; L= 1800 L= 0,95.
12. , :
180 | 160 | 140 | 120 | 100 | 90 | 70 | |
1,0 | 0,95 | 0,89 | 0,82 | 0,73 | 0,68 | 0,56 |
1= 151,3 = 0,92
13. , :
z | 23 | 46 | . 6 |
z | 0,95 | 0,90 | 0,85 |
, 2 3, z=0,95.
14.
z= × /( × L × a × z),
, ,
(. . 2.20); d1= 140 i ≥ 3 = 2,37 ;
Z = 5,33 ∙ 1/(2,37 ∙ 0,95 ∙ 0,92 ∙ 0,95) = 2,71
|
|
z = 3.
15.
F=850 ∙ ∙ p ∙ L/(z ∙ v ∙ a) + qv2,
v=0,5 w d1 = 0,5 × 101 × 140 × 10-3 = 7,07 /;
q-, × :
q, ×2/2 | 0,06 | 0,1 | 0,18 | 0,3 | 0,6 | 0,9 |
q=0,18 ×2/2.
F= 850 ∙ 5,33 ∙ 1 ∙ 0,95 / (3 ∙ 7,07 ∙ 0,92) + 0,18 ∙ 7,072 = 229,6.
16. , :
F= F × z × sin(a1/2) = 229,6 × 3 × sin(151,3/2) = 667,3 .
17. (. .2.23);
= (z 1)e+2f = (3 1)×19 + 2 × 12,5 = 63 .
3.1.
d1 d2:
d2 = d1×U=83,6 × 5 = 418 .
,
(. . . 2.6).
45, ; 90 230.
45, ; 120 200.
3.2.
s .
s= slim×HL /SH,
slim .
. .2.7
slim =2 + 70;
HL -
HL =1.
SH , SH = 1,1 [ 7, . 33]
s = 0,45 (s1 +s2) =0,45(482 + 428) = 410 .
s £1,23smin .
T2 ();
T2 = T1 × u = 142,5 × 5 = 712,5 ,
Y
Y = /w = 0,5 (. .2.3);
KHb ,
KHb = 1,25 (. .2.9);
K , , Ka =43.
2185-66, :
1- : 40, 50, 63, 80, 10, 125, 160, 200, 250, 315, 400, 500, 630, 800, 100, 1250;
2- : 71, 90, 112, 140, 180, 224, 280, 355, 450, 560, 710, 900, 1120, 1400, 1800.
w= 200 .
mn=(0,01...0,02) aw; 9563-60 mn = 2,5
(. . 2.4).
z =2aw×cosb/(U+1)mn.
b=10;
z1 = 26
z2 = z1 ×U = 26 × 5 = 130,
b:
cos b= (z1 +z2) mn /2w= (26+130) × 2,5/(2 × 200) = 0,975,
b=12,8.
.
:
d1= mn ×z1/cosb = 2,5 × 26 / 0,975 =66,7 ;
d2= mn ×z2/cosb =2,5 × 130 / 0,975 =333,3 .
|
|
:
aw=(d1+d2)/2= (66,7+333,3)/2 = 200 .
:
da1=d1 + 2mn= 66,7 + 2 × 2,5 = 71,7 ;
da2=d2 + 2mn=333,3 + 2 × 2,5 = 338,3 .
:
df1= d1 2,5mn= 66,7 2,5 × 2,5 = 60,45 ;
df2= d2 2,5mn=333,3 2,5 × 2,5 = 327,05 .
:
2 = Y w= 0,5 × 200 = 100 ;
2 = 100.
:
1 = 2 + 5= 100 + 5 =105 .
:
Yd =1/d1=105 / 66,7 = 1,57.
:
V=w1×d1/2= 37,5 × 66,7 × 10-3 / 2 = 1,25 /.
10 / 8- [7,. c. 32].
:
H = Hb × Ha × Hv,
Hb , ; Yd = 1,57, < 350 ( ) Hb = 1,22
(. . 2.10);
Ha , ; v = 1,25 / 8- Ha = 1,06
(. .2.9);
Hv , ; 5 / Hv= 1,0 (. .2.11).
,
= Hb × Ha× Hv = 1,22 × 1,06 × 1,0 = 1,29.
:
s = 410 ;
s ≤ s;
380,4 < 410;
. .
3.3.
, :
Ft = 2T1 / d1 = 2 × 142,5 × 103/66,7 = 4273 ;
Fr = Ft×tga / cosb = 4273 × tg20/cos12,8 = 1595
Fa = Ft×tgb = 4273 × tg12,8 = 971
sF = (Ft × KF×YF × Yb × KFL) / (b × mn) <sF.
:
KF = KFb × KFV,
KFb-, ( ),
Yd = 1,57, < 350 ( ) KFb = 1,45 (. .2.12);
KFV-, ( ), KFV= 1,1 (. .2.13).
,
KF = KFb × KFV =1,45 × 1,1 = 1,595.
YF, , ZV:
ZV1 = Z1 / cos 3b = 26,2/cos312,8 = 28;
ZV2 = Z2 / cos 3b = 130/cos312,8 = 140;
, x=0, YF :
YF1= 3,84 (. . 2.14);
YF2= 3,6 (. . 2.14).
:
sFP=sFlimb/SF;
SF=SF¢× SF¢¢,
SFmin ;
SF¢-, ,
SF¢ = 1,75 (. .2.15);
SF¢¢ , , , SF¢¢ =1,0.
,
SF=1,75 ×1 = 1,75.
sFlimb1 = 1,8 (. . 2.15).
sFlimb1 = 1,8 × 230 = 415 ( )
sFlimb2 = 1,8 × 200 = 360 ( ).
:
sF1= 415 / 1,75 = 237 ;
sF2 = 360 / 1,75 = 206 .
:
Yb = 1 b/140 = 1 12,8 / 140 = 1 0,58 = 0,91;
KFa = 4 + (xa-1)(n-5) / 4xa.
xa- ,
|
|
xa = 1,5;
n- , n = 8.
sF=(Ft×KF×YF×Yb× KFa)/b × mn.
sF1 = (4273 × 1,595 × 3,84 × 0,91 × 0,92)/ 105 × 2,5 = 83,5 < sF1= 237
sF2 = (4273 × 1,595 × 3,6 × 0,91 × 0,92)/ 100 × 2,5 = 81,3 < sF2 = 206 .
.