Civil Engineering Reference
In-Depth Information
For the practical calculation of the rotary angle the Excel-program FLAD-
REH2.xls can be used.
Example 2.10: Rotary angle of a bottom sheave
The distances corresponding with Fig.
2.28
are
r
1
= 200 mm
r
2
= 150 mm
h
0
= 8,000 mm
rope WS—IWRC—6 9 36—sZ—1,770 N/mm
2
d = 16 mm
c
1
= 0.085 from Table
2.6
s
1
= 0.012 from Table
2.6
W = 0.409 length mass factor, EN 12 385
g = 9.81 fall acceleration g in m/s
2
z = 2 number of bearing rope traces
x
0
= 20/100d
Results:
The weight force of the bearing wire rope traces in N is
G
rope
¼ W
d
2
h
0
g
z
=
100
;
000
G
rope
¼ 0
:
409
16
2
8
;
000
9
:
81
2
=
100
;
000 ¼ 164
:
3N
The wire rope tensile force is
S
¼
600
þ
0
þ
164
=
2
2
¼
341 N
:
The twisting factor is
f
twi
¼
1
;
128
548
¼ 2
:
06
:
The mean rotary angle of the bottom sheave without pre-twisting is according
Eq. (
2.81
)
u
50
¼ arcsin
8
;
000
16
0
:
085
¼ arcsin 03627
200
160
u
50
¼ 21
:
3
and according Eq. (
2.81a
) in 90 % smaller
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