Rigging and hoisting on site: roles and responsibilities

Every morning at Kingsway Tower the tower crane swings its first load before most trades have finished their coffee. Bundles of pipe, pallets of drywall, rebar cages, formwork, mechanical units and even portable toilets travel up the outside of the building on a hook. Inside, smaller lifts happen all day: a chain fall hung from a beam clamp lifts a pump onto its pad, a lever hoist pulls a heavy valve into line, a material lift carries boxes of fittings to the eighth floor. Above all of that, workers stand on scaffolds and in elevating work platforms to reach ceilings, walls and the outside face of the building. This course is about the equipment that lifts loads and the equipment that lifts people, and about the habits that keep everyone below and beside them safe.

Maya Chen, the first-year plumbing apprentice with Northbridge Mechanical, met the rigging side of the job in her second week. The crew needed a domestic hot water storage tank moved from the loading dock into the mechanical room on the first parking level. Luis Ferreira, her journeyperson, told her she would not be rigging it alone, but she would be helping, and that meant learning who does what before anyone touched a sling. "Most rigging accidents are not caused by a sling that was too small," he said. "They are caused by somebody who thought somebody else had checked."

Why rigging needs clear roles

When a load is in the air, several people share control of it. The crane or hoist operator controls the motion. The rigger chose and attached the slings and hardware. The signaller tells the operator what to do. The people guiding the load with tag lines keep it from spinning. The supervisor planned the lift and decided who would do each job. If any one of them assumes another has done their part, a gap opens: a sling that nobody inspected, a load weight that nobody confirmed, a drop zone that nobody cleared. Clear roles close those gaps.

Rigging failures tend to be severe. A dropped load or a swinging load can kill or crush in a moment, and struck-by incidents are one of the leading causes of serious injury in construction. The Focus Four hazards covered in TRD-101 (falls, struck-by, caught-in or between, and electrocution) all show up in this course: struck-by from dropped and swinging loads, caught-between when a load is landed, falls from scaffolds and platforms, and electrocution when a boom or a load comes near an overhead power line.

The people in a lift

The supervisor or lift director

Someone must be in charge of each lift. On a small lift with a chain fall, that might be Luis as the journeyperson leading the crew. On a crane lift, it is usually a supervisor or a person named as the lift director in the lift plan. This person confirms the load weight, chooses the equipment, makes sure everyone involved knows their role, checks that the area is controlled and has the authority to stop the job. On bigger or more complex lifts, which Lesson 8 calls critical lifts, the plan is written and reviewed in advance.

The operator

The crane operator controls the machine and is responsible for operating it within its rated capacity. In Ontario, operating a mobile or tower crane is part of the hoisting engineer trade, a compulsory trade, so the operator must hold the right certificate for the type of crane. The operator has the right and the duty to refuse a lift that they believe is unsafe, and must obey a stop signal from anyone on site.

Operators of smaller hoisting devices, such as a chain fall or a lever hoist, are often the tradespeople themselves. Maya will operate a chain hoist long before she is allowed near a crane control. The same principle applies: whoever is pulling the chain is responsible for knowing the hoist's capacity and for stopping if something looks wrong.

The rigger

The rigger selects, inspects and attaches the slings and hardware that connect the load to the hook. Ontario's construction regulation requires rigging to be selected, inspected and used by competent workers, and many sites, including Kingsway Tower, use trained riggers from the general contractor or a rigging contractor for crane lifts. Hector Ruiz, Stonebridge's lead rigger, rigs most tower crane picks; trade crews like Maya's rig their own smaller lifts under their supervisors, after training.

A good rigger works out the load weight, finds the centre of gravity, chooses slings with enough capacity for the hitch and angle, protects the slings from sharp edges, checks every piece of hardware and makes sure the load will hang level and stable. Lessons 2 to 6 cover each of these skills.

The signaller

When the operator cannot see the load or the area where it is moving, a signaller directs the lift. Ontario's construction regulation requires a competent signaller in those situations, and the signaller uses the standard hand signals found in CSA Z150 and posted in the crane cab. The signaller has no other duties during the lift and stays in clear view of the operator, or uses a radio on a dedicated channel.

There is only one signaller at a time, because two people giving directions is a recipe for confusion. The exception is the stop signal: anyone who sees a hazard can and must give it, and the operator must obey it immediately. Lesson 7 covers signals in detail.

Tag line handlers and everyone else

Tag lines are ropes tied to the load so that workers can control its rotation from a distance. Tag line handlers stand outside the area under the load and never wrap the rope around a hand or body. Everyone else on site has one job during a lift: stay out of the exclusion zone. Kingsway Tower barricades the crane's swing area and the landing zones during picks, and the rule is the same for every trade: never walk under a suspended load, and never let a load be swung over you.

Competent, qualified and trained

Ontario's Occupational Health and Safety Act defines a competent person as someone who is qualified because of knowledge, training and experience to organize the work, is familiar with the Act and regulations that apply, and knows about any potential or actual danger. The construction regulation uses the term competent worker for several rigging, scaffold and platform tasks. In practice that means documented training plus enough experience with the specific equipment.

For an apprentice, the message is simple. You may help with rigging, scaffolds and platforms only after training, under supervision, and only for the tasks you have been trained for. Training is not a one-time event: refresher training is needed when equipment changes, when an incident shows a gap, or when the site rules require it.

The equipment covered in this course

Cranes themselves are operated only by certified operators, so this course does not teach crane operation. It teaches what a tradesperson needs to know to work safely around cranes, to rig and signal under supervision, to use small hoists, and to use scaffolds and platforms correctly.

Standards you will hear about

Laws set the minimum. Standards fill in the detail, and many laws refer to them directly. You do not need to memorize them, but you should recognize the names when you see them on a tag, a manual or a lift plan.

• CSA Z150 covers safe use of mobile cranes, including the standard hand signals. CSA B167 covers overhead travelling cranes, gantry cranes and hoists. CSA Z248 covers tower cranes.
• ASME B30.9 covers slings, ASME B30.26 covers rigging hardware such as shackles, eyebolts and turnbuckles, and ASME B30.10 covers hooks. These American standards are used across North America, including on many Canadian sites, and manufacturers' tags and charts are based on them.
• The CSA B354 series covers mobile elevating work platforms: design, safe use and training. It was updated in 2017 alongside the American A92 standards so that both countries use the same groups and types of platforms.
• Ontario's Regulation 213/91 for construction projects sets the legal requirements for rigging, cranes, scaffolds, ladders and elevating work platforms on Ontario sites. Kingsway Tower's site rules build on it.

Rules that apply to every lift

Luis gave Maya a short list that he has carried in his head for twenty years. Every lesson in this course expands on one of them.

• Know the weight. Never lift a load whose weight you have not worked out or confirmed.
• Know your gear. Use only rated, tagged, inspected rigging and hoists, within their capacity for the hitch and angle you are using.
• Know your anchor. A hoist is only as strong as the beam or point it hangs from, and that point must be rated or approved for the load.
• Keep out from under. Never stand, walk or work under a suspended load, and keep hands out of pinch points when landing it.
• One signaller, anyone can stop. Agree on signals before the lift, and stop immediately when anyone calls it.
• When in doubt, stop and ask. Stopping a lift costs minutes; a dropped load can cost a life.

Anika Shah, Stonebridge's site safety coordinator, adds one more for Kingsway Tower: every crane lift starts with a short pre-lift meeting where the lift director, operator, rigger and signaller agree on the plan, the signals and the exclusion zone. Even a lift that happens fifty times a day gets a quick check, because the load, the wind and the people change.

Worked example: counting the people in a lift

Even a small lift has the same structure as a large crane pick: someone plans it, someone rigs it, someone operates the hoist, someone guides the load, and everyone else stays clear. The program below turns that structure into a simple checklist that refuses to start a lift until every role is filled and every check is done.

# pre-lift checklist: every role filled and every check done before lifting
roles = {"lift lead": "Luis", "rigger": "Luis", "hoist operator": "Maya",
         "tag line": "Jordan", "area control": "Dave"}
checks = {"load weight confirmed": True, "anchor rated for load": True,
          "slings inspected and tagged": True, "hitch capacity > load": True,
          "area barricaded": True, "signals agreed": False}

missing_roles = [r for r, who in roles.items() if not who]
open_checks = [c for c, done in checks.items() if not done]
for r, who in roles.items():
    print(f"{r:15} {who}")
if missing_roles or open_checks:
    print("DO NOT LIFT. Open items:", ", ".join(missing_roles + open_checks))
else:
    print("All roles filled and checks complete: lift may proceed.")

lift lead       Luis
rigger          Luis
hoist operator  Maya
tag line        Jordan
area control    Dave
DO NOT LIFT. Open items: signals agreed

In the example, the crew has not agreed on signals yet, so the checklist stops the lift. Agreeing on signals takes thirty seconds and prevents the most common misunderstanding on a lift: the operator lowering when the rigger meant stop.