ergonomics assessment and improvement for lifting tasks ...assessment (rapid upper limb assessment:...
TRANSCRIPT
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Ergonomics Assessment and Improvement for
Lifting Tasks in Thai Industries
1* 1 2 1
10800 2
10520 E-mail: [email protected]*
Waiyawit Waiyakarn1* Nantakrit Yodpijit1 Sunpasit Limnararat2 1Department of Industrial Engineering, Faculty of Engineering,
King Mongkut's University of Technology North Bangkok 10800, Thailand 3Department of Industrial Engineering, Faculty of Engineering
King Mongkut's Institute of Technology Ladkrabang E-mail: [email protected]*
3
(1)
(2) 3
6 7 8 9
NIOSH 1991 ( )
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Abstract
The act of manually lifting an object is one of the major concerns in the effective use of a workforce and in the prevention of back injury in Industry. Work-related musculoskeletal complains among workers
were found in this study at three factories: an automotive parts manufacturer, a paper box manufacturer, and a canned seafood manufacturer. The purposes of this study were (1) to investigate risks of injury
relating body postures and external loads of manual lifting tasks, and (2) to improve lifting tasks for preventing occupationally related back injuries due to lifting. Three methods of physical ergonomics
assessment (Rapid Upper Limb Assessment: RULA, Rapid Entire Body Assessment: REBA, and Static
Biomechanical Model) were used to identify the level of intervention needed for the workers. Results revealed that RULA scores ranged from 6 to 7, and REBA scores ranged from 8 to 9. These scores
indicated that workers performed repetitive movements and static muscle contractions, and lifting postures were not within suitable ranges of motion. Therefore, there was a need for immediate
improvement to reduce the levels of exposure to risk factors in manual lifting. The estimated compressive force and moment at the lower back based upon biomechanical model were below the 1991 NIOSH
criterion level. This implied that the demand of lifting tasks (external forces and moments) was within the
range of strength capabilities of workers.
Keywords: Lifting, Upper Limb Assessment (RULA), Rapid Entire Body Assessment (REBA), Static
Biomechanical Model, Improvement
1.
2554
1 3
35,709 (14.01%)
91,699 (43.88%) 34,518 (16.0%)
666 3 137
3 527
129,632 ( , 2554)
57.57%
33.45%
2554
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(Rapid Upper
Limb Assessment: RULA), (Rapid Entire Body Assessment: REBA)
(Static Biomechanics Model)
2.
(Physical Ergonomics Assessment) 3
(Rapid Upper Limb Assessment: RULA)
(Rapid Entire Body Assessment: REBA) (Static
Biomechanics Model)
[2] [3]
2.1
2.2
2.3
2
[1]
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3.
3.1
3.1.1
3.1.2 3.1.3
3.1.4 L5/S1
3.1.5
4.
4.1
4.1.1
A
- 1 20 - 45 3
+1 4 ( )
- 2 0 60 2
+1 3 ( )
- 3
15 3 - 4
1 - 5 4
2 4
1 step 5 6 - 6 0
1
4 - 7 +1
10 - 8 6 5
5 6 0 7 1
6
C B
- 9 20
3
- 10 20 3
- 11 1
- 12 9 3 3
1 B 4
- 13
1 4
- 14 2 10 1
- 15 12
B 13 14
C - 16 12 4
13 0 A 6 B
6 C (Final Score) 6
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4.2
4.2.1
- 1 20 2
2
- 2 20 - 60
4 4 - 3
1 1 - 4 1
2 2 4
3 1 A 6
- 5 4 - 10 1
- 6 4
6 5 0 6
C
- 7 20 - 45 2 (
) - 8 0 - 60
2 ( )
- 9 15 2
2
( ) - 10 7
2 8 2 9
2 B 3 - 11
0
- 12 10
3 11 0 8
C - 13 1
( 4 )
1
- 14 6 6 12
5 Table C 8 - 15 C 6
13 5 11
4.3
L5/S1
5.
3
(P-value
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(P-value