Handbook on Construction Safety Practices
2001 Edition

Key safety measures for excavation and shoring include:

• Installing fences or protective barricades around trenches to prevent falls, particularly during wet conditions.
• Ensuring sufficient lighting and warning signals at night to safeguard pedestrians and vehicles.
• Maintaining a berm that is at least one-third the trench depth or a minimum of 1 meter wide to avoid soil slippage and reduce pressure on support structures.
• Detecting and ventilating flammable gases exceeding 1.5% volume and avoiding the use of internal combustion engines within trenches unless proper precautions are in place.
• Prohibiting hazardous behaviors such as burrowing under trench sides and forbidding workers from resting close to trench edges.
• Providing support, bracing, or underpinning for adjacent building foundations during excavation.
• Assigning competent supervisors empowered to enforce safety protocols and educate workers on potential hazards and safety procedures.

These steps significantly reduce the risk of accidents and structural damage associated with excavation and support work.

Safe storage and management of explosives on construction sites involve:

• Keeping explosives exclusively in magazines or isolated buildings that are clean, dry, well-ventilated, seasonally cool, robustly constructed (bulletproof and fire-resistant), securely locked, and properly situated.
• Using portable magazines, fenced and guarded, for dispersed or short-term projects.
• Prohibiting the carrying of explosives in clothing pockets.
• Storing detonators, electric caps, or primers separately from other explosive materials.
• Avoiding storage near moisture, oils, gasoline, heat sources, or solvents.
• Forbidding smoking, open flames, or any sparking items near storage areas.
• Ensuring personnel entering magazines avoid footwear with iron nails or other sparking components.
• Only withdrawing the quantity of explosives needed for immediate use from storage.
• Maintaining strict guarding and supervision during transportation and handling.
• Keeping detailed records and test certificates accessible for inspection.

Following these guidelines ensures the safe use of explosives and minimizes risks of accidental detonation or injury.

Inspection procedures for scaffolding and formwork include:

• Conducting scaffolding inspections at least weekly or immediately after damage or adverse weather events such as storms and frost.
• Checking vertical posts for correct alignment and support, ensuring ledgers are straight, verifying the adequacy of diagonal bracing, confirming ties to the building for stability, inspecting the tightness of lashings and couplers, and verifying the security of planks and platforms.
• Ensuring guard rails and toe boards are in place, and ladders are secure and in good condition.
• Prior to formwork use, examining footings and sills for soundness, making sure adjustment screws and wedges fit snugly, panels are plumb both ways, cross braces are installed and locked, props are full-length and adequate, wedges at props are tight, and conducting load tests as required.
• Only trained personnel should erect and dismantle scaffolding or formwork.
• Guard rails and toe boards are mandatory for safety.
• Formwork removal should occur only after concrete has achieved sufficient strength, following site engineer instructions, and workers must wear proper personal protective equipment during removal.

These routines ensure the structural integrity and safety of temporary works during construction.

Precautions for the safe operation of heavy machinery and lifting devices include:

• Minimizing the movement of personnel, materials, and equipment to reduce hazards.
• Ensuring operators never lift loads exceeding the equipment's rated capacity.
• Employing mechanical aids fully, especially when handling awkwardly shaped items, and adjusting loads accordingly.
• Assigning a leader to oversee operations involving multiple workers.
• Using all required personal protective equipment.
• Guaranteeing that the ground is stable and free from slippery conditions.
• Enclosing hoists at ground level with gates at least 2 meters high and enclosing hoist shafts with wire mesh to prevent falling objects.
• Providing a single control point for hoist operation with clear visibility.
• Securing loads on platforms and marking safe working loads clearly.
• Installing automatic safety devices to detect rope or gear failures.
• Conducting weekly inspections and frequent wire rope checks.
• Displaying emergency operating instructions prominently.
• Ensuring cranes and derricks are inspected and certified by qualified personnel before use.
• Providing safe access to operator stations.
• Avoiding slant pulls, dragging loads, or moving vehicles during lifting.
• Keeping cranes clear of power lines.
• Securing derricks firmly with appropriate guying and lowering booms when not in use.
• Limiting operator working hours to prevent fatigue and prohibiting alcohol consumption during work.

Adherence to these measures ensures safe and efficient use of heavy machinery on construction sites.

The standard addresses electrical safety hazards on construction sites by requiring:

• That all electrical work be performed solely by licensed electricians.
• Compliance with approved electrical codes and statutory regulations in installation and maintenance.
• Protective guards on hazardous parts such as motors, gears, and wiring to prevent accidental contact.
• Treating all electrical conductors as live until confirmed otherwise, with use of insulating mats, gloves, and footwear.
• Displaying warning signs near live circuits and equipment.
• Authorization for temporary overhead electrical connections, which must be removed promptly after use.
• Proper earthing of all electrical equipment.
• Keeping walkways free of cables and avoiding cable joints unless adequately insulated.
• Installing lighting fixtures at heights of at least 2.5 meters with weatherproof fittings.
• Using hand lamps with protective glass covers and insulated handles, and employing 24 V lamps in confined spaces.
• Carrying out thorough inspections of electrical equipment before use.

These provisions collectively minimize risks of electrical shock, fire, and mechanical hazards associated with electrical installations in construction environments.