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Construction safety lecture-1
This document discusses construction safety and health. It defines key safety terms like accident, injury, hazard, and risk. It outlines common causes of construction accidents such as unsafe acts and unsafe conditions. The importance of safety is discussed in terms of human, financial, and regulatory factors. OSHA regulations are summarized, including record keeping, penalties for violations, and requirements for safety programs and procedures. Major elements of effective safety programs and procedures to prevent common accidents are also presented.
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Construction safety lecture-1
- 1. CONSTRUCTION SAFETY AND HEALTH KingSaud University Engineering College Civil Engineering Department Presented by Dr. Khalid Al-Dafer
- 2. Construction Safety andHealth Outline Safety Procedures Safety Programs OSHA Importance of Safety Accidents Causes Basic Terms What is Safety
- 3. What is Safety Safetyis the state of being safe; freedom from danger, risk, or injury. Safety is the absence of danger
- 4. Basic Terms - • Anaccident • An accident can be defined formally as 'an undesired event, which results in physical harm and/ or property damage (injury, property damage, interruption, delay). - • An injury • An injury is a consequence of an incident.
- 5. Basic Terms - • Hazard •Hazard means the inherent property or ability of something to cause harm. - • Risk • Risk is 'the chance or probability of loss', an evaluation of the potential for failure. • It is easy to confuse the terms 'hazard' and 'risk', but a simple way to remember the difference is that 'hazard' describes potential for harm,
- 6. Accidents Causes Unsafe acts -Workingwithout authority -Failure to warn others of danger -Leaving equipment in a dangerous condition -Using equipment at the wrong speed -Disconnecting safety devices such as guards -Using defective equipment •Using equipment the wrong way or for the wrong tasks - Failure to use or wear personal protective equipment - Bad loading of vehicles - Failure to lift loads correctly - Horseplay - Smoking in areas where this is not allowed -Drinking alcohol or taking drugs
- 7. Accidents Causes Unsafe conditions •Missing platform guardrails • Defective tools and equipment • Inadequate fire warning systems • Fire hazards • Hazardous atmospheric conditions • Excessive noise • Not enough light to see to do the work
- 8. Importance of Safety -It has been reported that construction, which consists of about 5% of the U.S. work force, accounts for some 20% of work fatalities and 12% of disabling injuries. - In the United States, the total annual cost (direct and indirect) of construction accidents has been estimated to exceed $17 billion.
- 9. Importance of Safety -In the United States, national concern over the frequency and extent of industrial accidents and health hazards led to the passage of the Occupational Safety and Health Act (OSHA) of 1970, which established specific safety and health requirements for virtually all industries, including construction. -OSHA is responsible for developing and enforcing regulations implementing this act.
- 10. Importance of Safety OSHAregulations and penalties has tended to obscure the fact that there are at least two other major reasons for construction management to be seriously concerned about safety. These reasons are humanitarian and financial. Everyone is understandably distressed when a fellow employee is killed or disabled, so the humanitarian basis for safety is apparent.
- 11. Importance of Safety However,many managers do not fully appreciate the financial consequences of accidents. Worker's compensation insurance premiums, for example, are based on a firm's accident rate. Public liability, property damage, and equipment insurance rates are also affected by accident rates.
- 12. Importance of Safety Constructionfirm can lose its competitive bidding position simply because of the effect of high insurance premiums resulting from a poor safety record. In addition to the visible cost of accidents represented by insurance and worker's compensation payments, there are other costs, which are difficult to estimate such costs associated with an accident include the monetary value of lost project time while the accident is investigated and damages are repaired, the time required to replace critical materials and equipment and to train replacement workers, as well as the effect on those portions of the project not directly involved in the accident.
- 13. OSHA The U.S. OccupationalSafety and Health Administration (OSHA) has produced a comprehensive set of safety and health regulations, inspection procedures, and record- keeping requirements. The law has also established both civil and criminal penalties for violations of OSHA regulations.
- 14. OSHA Table-1 indicates themaximum penalty for major categories of violations.
- 15. OSHA As shown inTable 1 , civil penalties of $7000 per day may be assessed for failure to correct a cited violation. Under criminal proceedings, a fine of $20,000 and imprisonment for 1 year may be adjudged for a second conviction of a violation resulting in the death of an employee. OSHA officials may also seek a restraining order through a U.S. District Court to stop work or take other action required to alleviate a condition identified as presenting imminent danger of serious injury or death.
- 16. OSHA Under OSHA regulationsemployers are required to keep records of all work-related deaths, injuries, and illnesses. It is not necessary to record minor injuries that require only first-aid treatment. However, all injuries involving medical treatment, loss of consciousness, restrictions on work or body motion, or transfer to another job must be recorded. A special report of serious accidents resulting in one or more deaths or the hospitalization of five or more employees must be made to OSHA officials within 48 hours.
- 17. OSHA One of themajor inequities of OSHA is that only management may be penalized for safety violations. Thus even though an employee willfully violates both OSHA and company safety regulations, only the company and its management can be penalized under OSHA for any safety violation. Therefore, the only way in which management may enforce safety regulations is to discipline or fire workers engaging in unsafe acts.
- 18. OSHA One of themajor inequities of OSHA is that only management may be penalized for safety violations. Thus even though an employee willfully violates both OSHA and company safety regulations, only the company and its management can be penalized under OSHA for any safety violation. Therefore, the only way in which management may enforce safety regulations is to discipline or fire workers engaging in unsafe acts.
- 19. OSHA OSHA safety regulationsfor construction consist largely of safety standards developed by segments of the construction industry. Requirements for equipment safety include rollover protection (ROPS), seat belts, back-up alarms, improved brake systems, and guards for moving parts. Maximum noise levels are also set for equipment operators and other workers.
- 20. OSHA It should bepointed out that OSHA safety regulations are considered to be the minimum federal safety standards and that the various states may impose more stringent safety standards for construction within the state. The U.S. Department of Labor has also delegated to certain states the authority and responsibility for enforcing OSHA regulations within those states.
- 21. Safety Programs All constructionfirms need a carefully planned and directed safety program to minimize accidents and ensure compliance with OSHA and other safety regulations. However, no safety program will be successful without the active support of top management. Job- site supervisors have traditionally neglected safety in their haste to get the job done on time and within budget.
- 22. Safety Programs Only whensupervisors are convinced by higher management that safety is equally as important as production will the benefits of an effective safety program be achieved. An effective safety program must instill a sense of safety consciousness in every employee.
- 23. Safety Programs There aremany ingredients in a comprehensive safety program, some of the major elements are listed below. 1. A formal safety training program for all new employees. Note: OSHA Regulations require every employer to "instruct each employee in the recognition and avoidance of unsafe conditions and the regulations applicable to his work environment…." 2. Periodic refresher training for each worker. 3. A formal supervisory safety training program for all supervisors.
- 24. Safety Programs 4. Aprogram of regular site visits by safety personnel to review and control job hazards. 5. Provision of adequate personal protective equipment, first-aid equipment, and trained emergency personnel. 6. An established procedure for the emergency evacuation of injured workers. 7. Provisions for maintaining safety records and reporting accidents in compliance with OSHA requirements.
- 25. Safety Programs 4. Aprogram of regular site visits by safety personnel to review and control job hazards. 5. Provision of adequate personal protective equipment, first-aid equipment, and trained emergency personnel. 6. An established procedure for the emergency evacuation of injured workers. 7. Provisions for maintaining safety records and reporting accidents in compliance with OSHA requirements.
- 26. Safety Procedures It hasbeen found that most serious construction accidents involve construction equipment operations, trench and embankment failure, falls from elevated positions, collapse of temporary structures and formwork, or the failure of structures under construction. OSHA safety regulations are quite specific in many of these areas and special management attention should be devoted to the safety of these activities.
- 27. Safety Procedures General Equipment Operations Construction Plant Excavations Construction of Structures Marineor Over-Water Construction list of major safety precautions should be helpful as a general guide:
- 28. Safety Procedures General Equipment Operations ConstructionPlant Excavations Construction of Structures Marine or Over- Water Construction - • Good housekeeping on a project site is both a safety measure and an indicator of good project supervision. - • Lumber, used formwork, and other material lying around a work area increase the likelihood of falls and puncture wounds.
- 29. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -Utilize guides or signalmen when the operator's visibility is limited or when there is danger to nearby workers. -Backup alarms or guides must be used when equipment operates in reverse. -Exercise extreme caution and comply with safety regulations when operating near high-voltage lines. -In case of accidental contact with a high-voltage line, the operator should attempt to move the equipment enough to break contact.
- 30. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -Make sure that machines are equipped with required safety features and that operators use seat belts when provided. -Use care when operating equipment on side slopes to prevent overturning. -When operating cranes, be extremely careful not to exceed safe load limits for the operating radius and boom position. -Electronic load indicators are available. -Do not allow workers to ride on equipment unless proper seating is provided.
- 31. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -Haul roads must be properly maintained. -Items to check include: condition of the road surface (holes, slippery surface, excess dust), visibility (curves, obstacles, intersections, and dust), and adequate width for vehicles to pass (unless one-way).
- 32. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -Park equipment with the brake set, blade or bowl grounded, and ignition key removed at the end of work. -Equipment used for land clearing must be equipped with overhead and rear canopy protection. -Workers engaged in clearing must be protected from the hazards of irritant and toxic plants and instructed in the first-aid treatment for such hazards.
- 33. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -When hauling heavy or oversized loads on highways, make sure that loads are properly secured and covered if necessary. -Slow-moving and over-sized vehicles must use required markings and signals to warn other traffic. -Take positive action to ensure that equipment under repair cannot be accidentally operated.
- 34. Safety Procedures General EquipmentOperations Construction Plant Construction of Structures Marine or Over- Water ConstructionExcavations -Utilize blocking, cribbing, or other positive support when employees must work under heavy loads supported by cables, jacks, or hydraulic systems. -Ensure that any guards or safety devices removed during equipment repair are promptly replaced. -Shut down engines and do not allow smoking during refueling.
- 35. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant -Set equipment containing hot or flammable fluids on firm foundations to prevent overturning. -Clearly mark high-temperature lines and containers to prevent burns. -Be especially careful of live steam. -Provide fire extinguishers and other required safety equipment.
- 36. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant -Aggregate bins and batching plants should be emptied before performing major repairs. -When electrical equipment is being repaired, shut off and tag electrical circuits. -Ensure that wire rope and cable is of the proper size and strength, well maintained, and inspected at least weekly.
- 37. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant The location of underground utilities and other hazards must be determined before starting an excavation. -Contact utility companies and property owners to request that they establish the location of such installations. -Almost all U.S. states have central One-Call telephone numbers which coordinate with utility companies to provide prompt service in locating and marking their underground lines when requested. -When utility companies or owners cannot provide this information promptly (usually within 24 hours), the contractor may cautiously proceed with excavation. -However, in this situation, the contractor must employ detection equipment or other acceptable means to locate and avoid underground hazards.
- 38. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant The sides of excavations must be properly shored or sloped to the angle of repose to prevent cave-ins. -OSHA regulations require that banks over 5 ft (1.5 m) must be shored, cut back to a stable slope, or otherwise protected. -Regulations also require that protective systems (sloping, benching, shoring, or shielding) for excavations over 20 ft (6.1 m) deep must be designed by a registered professional engineer. When workers are required to enter a trench excavation 4 ft (1.2192 m) or more in depth, a stairway, ladder, ramp, or other safe means of egress must be located in such a manner as to require no more than 25 ft (7.62 m) of lateral travel by any worker in the trench.
- 39. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant Avoid the operation of equipment near the top edge of an excavation because this increases the chance of slope failure. -The storage of materials near the top edge of an excavation, vibration, and the presence of water also increase the chance of slope failure. -When these conditions cannot be avoided, additional measures must be taken to increase slope stability. -If workers are required to enter the excavation, no spoil or other material may be stored within 2 ft (0.6 m) of the edge of the excavation.
- 40. Safety Procedures General Construction of Structures Marineor Over- Water ConstructionExcavations Equipment Operations Construction Plant Ensure that workers are not allowed under loads being handled by excavators or hoists. Watch out for buried lines and containers when excavating. -Possible hazards include toxic and flammable gases, electricity, and collapse of side slopes due to sudden release of liquids. -If a gas line is ruptured and catches fire, get personnel and flammable material away from the fire and have the gas turned off as quickly as possible. -Do not attempt to extinguish the fire because an accumulation of unburned gas poses a greater threat than does a fire.
- 41. Safety Procedures General Construction ofStructures Marine or Over-Water Construction Excavations Equipment Operations Construction Plant -Properly guard all openings above ground level. -Provide guard rails, safety lines, safety belts, and/or safety nets for workers on scaffolds or steelwork. -Ensure that temporary structures are properly designed, constructed, and braced.
- 42. Safety Procedures General Construction ofStructures Marine or Over-Water Construction Excavations Equipment Operations Construction Plant Special caution should be exercised in high-rise concrete construction. -Forms must be of adequate strength and properly braced. -The rate of pour must be maintained at or below design limits. -Shoring must be adequately braced and not removed until the concrete has developed the required strength.
- 43. Safety Procedures General Construction ofStructures Marine or Over-Water Construction Excavations Equipment Operations Construction Plant -Marine or over-water construction operations present all of the usual construction hazards plus additional hazards posed by the marine environment. -These additional hazards include drowning, slippery surfaces, increased tripping and height hazards, as well as weather and wave action. -Some of the major safety precautions that should be taken are listed below. -Unless workers can safely step onto vessels, a ramp or safe walkway must be provided. -Access ways must be adequately illuminated, free of obstructions, and located clear of suspended loads.
- 44. Safety Procedures General Construction ofStructures Marine or Over-Water Construction Excavations Equipment Operations Construction Plant -Working areas should have nonslip surfaces, be maintained clear of obstructions, and be equipped with adequate handrails. -Workers on unguarded decks or surfaces over water must wear approved lifejackets or buoyant vests. -Life rings and a rescue boat must also be available. -Workers more than 25 ft (7.6 m) above a water surface must be protected by safety belts, safety nets, or similar protective equipment.