1 / 14

concrete mixers

What is a Concrete Mixer. By definition a concrete mixer is a device that combines cement, aggregate such as sand or gravel, and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens. .

Thomas
Download Presentation

concrete mixers

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

    1. Concrete Mixers

    2. What is a Concrete Mixer By definition a concrete mixer is a device that combines cement, aggregate such as sand or gravel, and water to form concrete. A typical concrete mixer uses a revolving drum to mix the components. For smaller volume works portable concrete mixers are often used so that the concrete can be made at the construction site, giving the workers ample time to use the concrete before it hardens.

    3. Why Is Safety a Concern Safety is a major concern when it comes to concrete mixers Why?- Solely because injuries can and unfortunately happen on construction jobs. Injuries not only cause health problems, lost time limbs and things of the like but inevitably lost time and money for all parties involved.

    4. Injury Statistics More than 250,000 people work in concrete manufacturing. Over 10 percent of those workers - 28,000 - experienced a job-related injury or illness and 42 died in just one year. Potential hazards for workers in concrete manufacturing: Eye, skin and respiratory tract irritation from exposure to cement dust; Inadequate safety guards on equipment; Inadequate lockout/tagout systems on machinery; Overexertion and awkward postures; Slips, trips and falls; and Chemical burns from wet concrete

    5. Safety Procedure Examples Many Injuries occur in relation with cement mixers. Some examples and how to curb the occurrence of such injures are as follows Cement Dust Hazard: Exposure to cement dust can irritate eyes, nose, throat and the upper respiratory system. Skin contact may result in moderate irritation to thickening/cracking of skin to severe skin damage from chemical burns. Silica exposure can lead to lung injuries including silicosis and lung cancer.Solutions: Rinse eyes with water if they come into contact with cement dust and consult a physician.Use soap and water to wash off dust to avoid skin damage. Wear a P-, N- or R-95 respirator to minimize inhalation of cement dust Eat and drink only in dust-free areas to avoid ingesting cement dust.

    6. Safety Procedure Examples Wet Concrete Hazard: Exposure to wet concrete can result in skin irritation or even first-, second- or third-degree chemical burns. Compounds such as hexavalent chromium may also be harmful.Solutions: Wear alkali-resistant gloves, coveralls with long sleeves and full-length pants, waterproof boots and eye protection.Wash contaminated skin areas with cold, running water as soon as possible.Rinse eyes splashed with wet concrete with water for at least 15 minutes and then go to the hospital for further treatment.

    7. Safety Procedure Examples Machine Guarding Hazard: Unguarded machinery used in the manufacturing process can lead to worker injuries. Solutions: Maintain conveyor belt systems to avoid jamming and use care in clearing jams. Ensure that guards are in place to protect workers using mixers, block makers, cubers and metalworking machinery such as rebar benders, cutters and cage rollers. Establish and follow effective lockout/tagout procedures when servicing equipment. Be sure appropriate guards are in place on power tools before using them.

    8. Safety Procedure Examples Poor Ergonomics Hazard: Improper lifting, awkward postures and repetitive motions can lead to sprains, strains and other musculoskeletal disorders. Solutions: Use hand trucks or forklifts when possible. Lift properly and get a coworker to help if a product is too heavy. Avoid twisting while carrying a load. Shift your feet and take small steps in the direction you want to turn. Keep floors clear to avoid slipping and tripping hazards. Avoid working in awkward postures.

    9. Safety Procedure Examples

    10. Safety Procedure Examples Vehicles Hazard: Poorly maintained or improperly handled vehicles can lead to crushing injuries at the plant site or other injuries for truck drivers. Solutions: Make sure back-up alarms on all vehicles are functioning. Avoid overloading cranes and hoists. Use care with the load out chute on concrete mixers to avoid injuries to hands and fingers. Beware of hot surfaces on equipment and truck components. Guard eyes against splashes of aggregate materials during loading and unloading. Use hearing protection if needed to guard against excessive noise exposure during cement loading/unloading and while using pneumatic chippers inside truck mixer drums.

    11. Safety is Key Laborer Fatally Injured While Cleaning Concrete Mixer - Tennessee On May 15, 1995, a 25-year-old male laborer (the victim) at a concrete-pipe-manufacturing facility died from injuries he received while cleaning a ribbon-type concrete mixer. The mixer is cleaned out each day at the end of the shift, by the laborer and the mixer operator. The procedure for cleaning the mixer is to shut off the power at the breaker box (approximately 35 feet from the mixer), push the toggle switch (adjacent to the mixer) for the mixer to determine if the power is off, and then enter the mixer to scrape down the inside and shovel the concrete debris out the front discharge chute. The event was un-witnessed; however, it is assumed that the mixer operator shut off the main breaker, and, instead of the normal procedure for checking the mixer before entry, decided to make a telephone call. The victim, a Mexican immigrant who spoke or read very little English, not knowing the mixer had been de-energized at the main breaker, turned the mixer back on, thinking he had shut it off. The victim then entered the mixer without first pushing the toggle switch to verify that the power was off and started cleaning. The mixer operator returned from making his telephone call, and pushed the toggle switch to check the mixer, and heard the victim scream. He proceeded immediately to the main breaker and shut off the mixer. The emergency medical services was called, arrived at the site in 30 minutes, and transported the victim to a local hospital, where he was then transferred to a local trauma center. He died at the trauma center approximately 4 hours later.

    12. What does OSHA Have to Say The 10 OSHA standards most frequently included in the agency's citations were: Hazard communication Lockout/tag out Confined spaces Respiratory protection Guarding floor & wall openings and holes Electrical wiring methods Noise exposure Forklifts Electrical systems design Machine guarding

    13. OSHA Regulations 1926.726(b) Concrete mixers. Concrete mixers with one cubic yard (-8 m(3)) or larger loading skips shall be equipped with the following: 1926.702(b)(1) A mechanical device to clear the skip of materials; and 1926.702(b)(2) Guardrails installed on each side of the skip.

    14. For More Information All information was compiled from internet and can be found at www.osha.gov www.wikepedia.com www.cdc.gov For more information concerning concrete mixers these sites can and will provide more insight on the topic.

More Related