China
Africa
Explore chapters and articles related to this topic
Unsafe Acts and Conditions
Published in Ron C. McKinnon, Cause, Effect, and Control of Accidental Loss with Accident Investigation Kit, 2019
In Case Study 4 (Questions and Answers on Effective Accident/lncident Investigation 1990), the injured employee’s recollections of his actions, which led to devastating personal consequences for him, are related as follows: Then came the most terrible day in my life, 21st September 1980, at 2.30 pm. I was working on the steering clutches of a piece of heavy earth-moving equipment. To replace core lead inserts on a steel band I had to grind off some old welding. I was working on a rough and ready construction site and the only grinder (angle grinder) had been bolted onto a box and the box had been filled with rocks for added “safety” and stability as a base.I could not reach inside the break bands to grind with the guard in position. Without thinking, I removed the guard. I did not realize that I was adding more danger to an already hazardous situation. Suddenly, as I commenced working, the wheel disintegrated. I felt a terrible pain in my stomach. A wedge-shaped piece of the wheel sliced its way through my abdominal muscles and into my abdominal cavity. It caused a 12-cm long wound in my abdominal muscles. It then left my body through an 8-cm gash in my back and smashed into my lower leg …. (p.51)
Fundamentals of human responses to vibration
Published in Frank Fahy, John Walker, Fundamentals of Noise and Vibration, 2003
(a: pncumatic rock drill; b: pneumatic road breaker; c: petrol-driven Wacker compressing road surface after mending; d: a non-anti-vibration chain saw; e: an anti-vibration chain saw; f: a pncumatic metal-chipping hammer: g: pole scabbier; h: needle gun; i: random orbital sander; j: impact wrench; o: riveting gun; I: dolly used with riveting gun; m: nutrunner; n: metal drill; o: wire swaging; p: etching pen; q: electric 9-inch angle grinder; r: pncumatic rotary file; s: pncumatic 5-inch straight grinder; t: pncumatic 7-inch vertical grinder. All spectra from the axis giving the highest weighted acceleration.) (Data from Griffin, 1997).
Free-Thinking Hazard Identification
Published in John White, Health and Safety Management, 2018
Peter Shipley, Programme Delivery Director at Tideway, explains an example from the construction industry:I heard of a worker using an angle grinder on site to cut reinforcing bars, in accordance with the method statement. He had to stretch into a cage to reach a bar to the point where he lost control of the angle grinder and ended up with a nasty cut on his arm. It could have been much more serious. The focus on the method statement as being the main tool for ensuring safety reduces the focus on FTHI. The operative just didn't imagine or visualise the outcome that happened – he was too busy getting the job done and the box-ticking exercise driven by overadministrative method statements.A better approach would be to use more visual and much simpler method statements, but to include the FTHI trigger moment at the start of the operation. Perhaps the morning site briefings that all staff have at the start of a shift could include those FTHI trigger moments along with discussion about a range of potential accidents that could happen that day and a reminder for all to stay safe. This can be linked to the concept of perfect day.Perfect day is a concept our contractors are using that focuses on a one day at a time – let's have nothing go wrong. This idea gets people thinking every morning about what might happen and what they need to do to have another perfect day. We have charts up at each site with the days on the chart and a smiley face gets put in for every day that passes without an accident.
Design and analysis of a compliant polishing manipulator with tensegrity-based parallel mechanism
Published in Australian Journal of Mechanical Engineering, 2021
Wei Zhu, Jiahong Liu, Hanbing Li, Kairong Gu
To demonstrate the developed polishing device, a discarded car shell, which has the features of large size, no concave, and no burr, is used as the polished workspiece to carry out experiment test. We choose a Thunderbolt Leopard A2150 pneumatic angle grinder with large polished diameter as the polishing tool in this experiment. This pneumatic grinder has the advantages of small pallet size, high no-load speed, light weight and low energy consumption. The parameters of this device are set as follows: the radius of polishing tool is r = 54mm, the output speed of angle grinder is v = 300r/min, the distance between the rotation platform and local surface is t = 65mm, the constant of the spring legs and the spring-loaded prismatic joint are k1 = k2 = k3 = k = 6468N/m, the radius of the two platform a = b = 45mm, the height of the telescopic leg p = 48mm. A HP20D industrial robot by YASKAWA company is used as a manipulator arm in this experiment. The arm length of the manipulator is only to control the range that the grinder can reach. The spring stiffness reflects the stiffness of tensegrity-based parallel mechanism, so there is no relationship between grinder type with arm length, spring stiffness. The test site is shown as Figure 7.
Fiber emission of carbon nanotube containing materials for construction applications
Published in Aerosol Science and Technology, 2021
Candace S. J. Tsai, Nara Shin, Anthony Formella
The cylinder containing CNT is denoted “C,” and the cylinder not containing CNT is denoted “D”, as product code. Three experiments were performed for each cylinder and noted with numbers 1 to 3. The evaluation of particle release from the cylinder began with a 10 min pre-experiment background measurement. Then, the concrete cylinder was ground by using a small angle grinder in a cycle of 2 min of grinding and a 3 min break for six cycles, for a total of 30 min. The post-experiment background concentration was measured immediately after the grinding cycles were finished, until the total experimental time of 2 h was reached. All measurements and collections of airborne substances were performed 12.7 cm/5 inch horizontally away from the center of the cylinder and 25.4 cm/10 inch vertically above the work surface of the glovebox, which is 5 cm/2 inch vertically above the surface of the cylinder, as shown in Figure S1.
Analyzing musculoskeletal risk prevalence among workers in developing countries: an analysis of small-scale cast-iron foundries in India
Published in Archives of Environmental & Occupational Health, 2022
Krishan Kumar Kataria, Milap Sharma, Suman Kant, Narendra Mohan Suri, Sunil Luthra
Apart from work posture; other considerable parameters include muscular load; (manipulated object weight), posture frequency; posture marked “static” (if held > 10 minutes), “intermittent” (if repeat frequency < 4 times/minute) and “repeated” (if > 4 times/minute). Figure 7 shows the RULA analysis performed on work posture. Figure 7 represents the analysis score range in each segment as well as the associated color code for work postures attained during the angle grinding (AG) operation; this involves a load value of 6 kg (the angle grinder weighs 6 kg) and a posture-repetition coupling greater than 4 times/minute; This resulted in a final right-sided RULA score of 6.