Construction safety part 1
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Transcript of Construction safety part 1
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SAFETY ON CONSTRUCTION SITESPART-I
BY AK GUPTA EE(TRG)
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INTRODUCTION
• Construction industry employs around 250 million people and contributes 7% of global employment.
• The industry is tarnished for its reputation as "Dirty, Difficulty and Dangerous – the three Ds”
• According to International labour organization, the industry which accounts 7% of the global employment is responsible for 30 to 40 percent of world’s fatal injuries
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Construction Workers in INDIA• Construction industry in India is the second largest
industry . • It employs 32 million people and its market size is
worth about Rs. 2,48,000 crores. • It comprises of 55% of the unskilled, 27% skilled
labour and rest consists of support and technical staff .• The report from ILO, 2009, revealed that every year
nearly 50,000 Indian die from illness or work related accidents
• On an average, 165 workers per 1000 are injured.
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Accident Causation Theories
• Accidents are unplanned, undesired unexpected and uncontrolled that may result in damage to property and injury to person
• Heinrich---Five Dominoes-(1) Social Environment and ancestry,(2)fault of person,(3)unsafe act/unsafe condition,(4)accident and (5)injury
• Inherited traits---stubbornness,greed.recklessness,bad tempered,inconsiderate
• Unsafe act or unsafe condition is the central factor
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Unsafe Conditions
• Rough, sharp or slippery work• Defective equipment• Overloaded tools/equipment• Defective ladders/scaffolds• Improper clothing• Inadequate aisle space, inadequate
ventilation, improper illumination• Protruding ends of reinforcements,nails
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Unsafe acts
• Not wearing helmets, safety glasses• Working while intoxicated• Working with insufficient sleep• Moving electrically energized or pressurized
equipment• Failure to use safety belt, fall arresters and
safety net• Using hands instead of hand tools
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Foundation of Major Injury
• Foundation of Major injuries (Heinrich 1959)
1 MAJOR
injury1 out of 330
accidents
29Minor Injury
29 out of 330 accidents
300 NO injury
300 out of 330 accidents
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Foundation of major accidents
• Foundation of Major accidents/injuries (bird and loftus 1982, cited in Mining Safety Handbook)
1 Serious or disabling injuries
10 Minor injury, i.e., any reported
injury less than serious
600No visible injury or damage
30Property-damage
accidents of all types
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Causes of fatalities• Fall from height-------------32%• Mechanical impact---------10%• Fall/hit by objects-----------10%• Accidents involving vehicles------------9%• Electrocution-----------------------8%• Collapse of structures --------------7%• lifts---------------------------------------2%• Drowning------------------------------1%• Fire--------------------------------------1%• combined-------------------------4%• Others--------------------------16%
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Prevention of Accidents
• Initial job instructions• Priority to engineering• Stressing the after-effects of accident• Appeal to the workers to care for his family• Showing disapproval of unsafe acts• education
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SITE PLANNING AND LAY OUT
• Badly planned and untidy site : cause of many accidents
(a)From fall of materials (b)Collision between workers and plant or
equipment• Space constraints the biggest limiting factor in
urban areas
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Planning before work begins
• The sequence in which work is to be done• Note the hazardous operations and processes• Access for workers on and around site• Routes free from obstruction , falling
materials and equipments• Suitable warning notices to be posted• Routes to welfare facilities to be clear and
marked
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Edge Protection• Edge protection required at the edge of floor
openings and stairs and where there. is drop of 2 meters.
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Edge Protection
Edge protection: Guard-rails and toe boards at open edges of floors and working platforms to prevent workers from falling
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TYPICAL EDGE PROTECTION
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VEHICULAR TRAFFIC• Vehicular movement to be “one-way” as far as
practicable• Traffic congestion prejudices safety of workers when
impatient drivers unload goods hurriedly• Materials to be stored close to work stations• Construction machinery on operational requirement• suitable locations for workshops and medical
facilities• Sanitary facilities for both sexes at several locations• Artificial lighting where workers pass after dark.s
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SITE SECURITY
• site to be fenced to keep out unauthorized persons.
• Protect children and public from site hazards• Fencing to be 2 mtr high without gaps and holes• Overhead protection to public necessary if tower
crane load passes over public thoroughfares• Low voltage electrical power for temporary
lighting
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SITE TIDYNESS
• Accidents occur due to tripping ,slipping and stepping over on nails
• Clean as you go• Keep gangways, working platforms and stairways
clear of equipments• Cleanup spilled oil and grease• Deposit waste material at a recognized disposal
point• Remove or hammer down any projecting nails
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gangways
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TIDYNESS
Clean up spilt oil or grease
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NAILS : HAMMER DOWN
Hammer down any nails projecting from timber
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EXCAVATIONCauses of accidents
• Workers trapped and buried due to collapse of sides• Workers struck by the material falling into the
excavation• Workers falling into excavation• Unsafe means of access and insufficient means of
escape• Vehicles driven too close to excavation while reversing• Asphyxiation or poisoning---exhaust fumes from diesel
and petrol engines
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Preventing collapse of excavation
• Sides of excavation to be sloped to a safe angle of repose, usually 45 degree
• Excavations 1.2m or more to be provided with adequate timbering or sheeting
• Close boarding or sheeting is required if the ground is unstable or lacks cohesion
• Never work ahead of the trench support• Erect suitable barriers to prevent falls into the
trench
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SHORING
Shoring to prevent the collapse of the sides of an excavation consisting of timber or steel frames with close boarding between frames
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Barriers
Barriers along the sides of an excavation to prevent workers falling into it
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Inspection
• To be inspected by a competent person before work begins
• At least once in a day when work is in progress• Thoroughly examine once in a week• Keep record of such inspections
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Adjoining Buildings
• Excavation should not be so close and deep to undermine any adjacent structure
• Shoring or other measures to ensure safety of adjoining structure
• Not to store or move material and equipment near the edge of an excavation
• Spoil and waste heaps to be kept away from edges of excavation.
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BUILDING PROTECTION
Excavation near a building: Shoring required to prevent collapse of the building
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Miscallaneous• Well anchored stop blocks to be provided on the
surface to prevent vehicles reversing into an excavation while tipping.
• provide safe means of access and egress such as secured ladder ex. In the event of flooding.
• Adequate lighting around the area of excavation. • Appearances can be deceptive, most accidents
happen in trenches less than 2.5 m deep• Always wear a safety helmet while working in an
excavation
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Stop Blocks
Stop block to prevent vehicles being reversed into an excavation while tipping
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Underground services• Electrical cables, water and sewer lines ,gas
pipes, telephone lines • Severe burn injuries due to live electrical cables• Ask from electrical authority, local authority
about the lay out of cables• Even if plan exists, some cables may not be laid
according to available plan• Look for traffic signs, street lights and substations
around• Use cable locators
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Marking Electrical Cable
Locating buried electrical cables from a plan and marking their position
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Points to remember
• Hand dig with care as cables may be just below the surface
• Use a shovel or spade and not a fork or pick-axe. Do not spear the tools into the ground
• if cable is embedded in concrete , do not break it but seek advice
• If cable is damaged , keep well clear• Do not work bare chested. Work clothing
provide protection from flash burns.s
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Gas pipes
• Do not use mechanical excavators within half a meter of a gas pipe
• In case of gas smell, make sure thre are no source of ignition nearby such as a lit cigarette, or running vehicle engines
• Keep the people away and call gas authority• While backfilling a trench with gas pipe , do
proper compaction beneath the pipe to prevent settlement which may lead to pipe fracture.
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Ladders• make sure there are no overhead power lines with
which the ladder might make contact;
• wooden ladders with wire-reinforced stiles should be used
• the ladder should extend at least 1 m above the landing place, or above the highest rung on which you have to stand. This is to stop the risk of over-balancing when you step off and on at the top
• never use a ladder which is too short, and never stand it on something such as a box, bricks or an oil drum to gain extra height
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Ladders• place the ladder at a safe angle of about 75° to the
horizontal, that is about 1 m out at the base for every 4 m in height
• face the ladder when climbing or descending • ensure that there is sufficient space behind the rungs
to provide a proper footing; • for extension ladders, make sure you leave an
overlap of at least two rungs for sections up to about 5 m in length and at least three rungs for sections of more than 5 m in length
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LADDERS• always raise and lower extension ladders from the ground and
make sure that hooks or locks are properly engaged before you start to climb;
• make sure that your footwear is free from mud or grease before you begin to climb a ladder
• if possible carry your tools in your pockets or in a holster or bag when you climb ladders.
• try not to carry materials while you are climbing ladders – use a hoist line instead;
• a common cause of accidents is overbalancing or overreaching, so
do not be tempted to stretch too far instead move the ladder
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OVERREACHING
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SECURING THE LADDER
Ladder secured at its upper end, extending above the landing place
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Securing the ladder
Ladder secured at its foot to stop movement
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Safe use of Ladders
Safe use of ladders – allow sufficient overlap of extension-ladder sections; carry tools safely; don’t overreach
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