The Wrong Way of Using Drywall Lift

Keyword:Drywall Lift   Time:2019-3-4 23:23:02

This is a report on the results of studies on the  instability of workers' postures when lifting or hanging plaster boards.

 August 2000

 According to statistics from the Bureau of Labor  Statistics, falls account for 32% of traumatic injuries among dry wall erectors  (1992-1995). Falling is an important factor leading to fracture, muscle and  skeleton injury and even death. Drywall lifting and hanging tasks require  workers to deal with heavy dry wall panels and maintain clumsy postures so that  materials can be installed on walls or ceilings. Previous studies have shown  that dry wall lifting and hanging operations cause more fall-related injuries  than other operations. Activities associated with these two tasks often lead to  muscle fatigue and a tendency to lose balance. In addition, because dry wall  installers often work at high altitudes, they face a high risk of falling. The  purpose of this study was to investigate the postural instability of workers  when lifting or hanging gypsum boards. Forty-seven construction workers  (average age = 34.7 + 9.1 years) with at least six months of dry wall  installation experience (average experience = 9.1 + 6.8 years) participated in  this study. Each participant used one of four lifting methods for four times:  1) vertical lifting of the dry wall; 2) horizontal lifting of the dry wall with  both hands on the top of the dry wall; 3) horizontal lifting of the dry wall  with both hands on the bottom of the dry wall; 4) horizontal lifting of the dry  wall with one hand on the top and one hand on the bottom. Subjects were also  asked to perform four suspension tests using one of four suspension methods: 1)  hanging vertically on the wall; 2) hanging horizontally on the wall; 3) hanging  vertically on the ceiling; and 4) hanging horizontally on the ceiling. This  study is a completely randomized design. Each participant was randomly assigned  lifting and suspension methods. A piezoelectric force platform was used to  quantify the postural instability of workers. Two attitude swing variables  (swing length and swing area) and two indicators (near stable boundary index  (IPSB) and stable area ratio (SAR) were used to describe the tendency of workers  to lose balance in the process of lifting and suspension of dry wall. The  variance analysis showed that different lifting modes had significant effects  on two postural swing variables (mean P < 0.001) and two postural  instability indices (mean P < 0.002). It was found that the horizontal  lifting of the dry wallboard with both hands at the bottom of the dry wall  caused significantly greater postural swing and instability than that with both  hands at the top of the dry wall (all P < 0.01). Posture swing and  instability associated with horizontal suspension on the ceiling are greater  than that associated with vertical suspension on the wall or horizontal  suspension on the wall (all P values are less than 0.001). All simulated dry  wall lifting and suspension tests were carried out on the ground. If a worker  lifts and hangs a dry wall at high places such as ladders, scaffolding and  stilts, the posture swing and instability of the worker may be more intense,  leading to higher risk and severity of falling. The results show that in order  to minimize the instability of posture, workers should avoid putting their  hands on the bottom of the wallboard and lifting the dry wallboard in a  horizontal position. Workers should also avoid hanging dry wallboards  horizontally from the ceiling (Method 4).

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