HK Truss-out Scaffolder (CIC) key terms

Hong Kong subsidiary legislation under the Factories and Industrial Undertakings Ordinance that sets minimum safety duties for construction sites, including scaffold erection, inspection, working platforms and safe access provisions.

The principal Hong Kong law (Cap. 59) that imposes general safety duties on proprietors and persons employed in industrial undertakings, including construction, and provides the power to make subsidiary regulations.

Guidance issued by the Labour Department describing safe design, erection, alteration, dismantling and inspection of bamboo and metal scaffolds, used as practical reference for complying with the safety regulations.

A person with the training, experience and knowledge to design, erect, inspect or certify scaffolds, appointed in writing where required, and legally responsible for the judgments recorded in inspection certificates.

The legal obligation of a main contractor to provide a safe system of work, safe plant, competent supervision and adequate information to everyone on site, including subcontractors' scaffolders and members of the public affected by the works.

The defined tasks a truss-out scaffolder may perform, typically erecting, altering, inspecting and dismantling metal truss-out scaffolds to a specified design, staying within trade competence and never modifying structural arrangements without authorisation.

Planning and communication between the main contractor and scaffold subcontractors so that work sequences, exclusion zones, tie-in points and resident access arrangements are agreed before erection or dismantling begins.

A dimensioned plan and section prepared for a truss-out scaffold showing tube sizes, spacing, anchorage positions, tie-backs, raking members, platform widths and load limits, against which erection is checked.

A scaffold projecting from a building facade, supported by frames or brackets anchored into the structure, used where ground support is impossible, typically for facade repairs, sign work or external maintenance.

The permanent weight a scaffold must carry, including tubes, couplers, boards, toe boards, protective mesh and any fixed equipment, calculated into the design before deciding anchorage and member sizes.

The variable weight imposed on a working platform by workers, hand tools and materials at any one time, which must stay within the design rating and be controlled by housekeeping and material limits.

The maximum load a platform, member or anchorage is designed to carry in normal service, determined by the designer and communicated to users so that overloading and structural failure are prevented.

A fixing inserted into the building structure to transfer scaffold loads into the facade, requiring adequate embedment, correct hole depth, tightening to specification and periodic checking for looseness or corrosion.

A tension member connecting the outer scaffold frame to a reliable part of the building to resist overturning and lateral movement, installed at designed intervals and never removed without replacement or approval.

A diagonal tube acting in compression or tension to brace a truss-out scaffold, forming triangles that carry loads back to the facade and prevent racking or collapse of the projecting frame.

A field test applying a controlled tensile force to an installed anchor to verify its holding capacity, with results recorded and compared against the design requirement before the scaffold is loaded.

A hollow steel member, commonly 48.3 mm outside diameter, used for standards, ledgers, transoms and braces, accepted only if straight, free of cracks, excessive corrosion, dents or welded repairs.

A clamp joining two tubes at about 90 degrees, tightened to the specified torque with a proper spanner, inspected for thread damage and slip, and never substituted with a swivel where a rigid joint is required.

A clamp that joins two tubes at any angle, used for bracing and raking members, and checked for free movement of the bolt, correct seating and adequate tightening before loading.

The tightening force applied to a coupler bolt, checked with a torque wrench to the manufacturer's or design figure so the joint neither slips under load nor crushes or cracks the tube.

Conditions that make a scaffold tube unfit for use, such as cracks, splits, severe corrosion pitting, bends beyond tolerance, crushed ends, or unauthorised welded repairs, requiring the tube to be tagged out and removed.

A timber or metal platform plank laid across transoms to form the working surface, required to be sound, free of splits and rot, of consistent thickness and fully supported without overhang beyond limits.

A low upstand fixed along the edge of a working platform to stop tools, materials and debris sliding or being kicked off the scaffold and falling onto people below.

Netting or mesh fixed to the outer face of a scaffold to contain debris and reduce the risk of objects falling to the street, installed without blocking access or trapping wind loads beyond design.

The boarded level of a scaffold on which work is performed, required to be complete, closely boarded, of adequate width, with safe access and edge protection on all open sides.

A system of top rails, intermediate rails and toe boards at every open edge of a platform or floor opening, designed to prevent both falls of persons and falls of materials.

Personal fall arrest equipment worn by a scaffolder, comprising a full body harness, lanyard and connector, attached to a suitable anchorage and inspected before each use for wear, cuts and damaged hardware.

A vertical or horizontal rope or cable anchored separately from the scaffold so that a fall arrest lanyard remains attached to a sound anchorage even if the scaffold itself moves or collapses.

A structural point of sufficient strength to take the arrest forces of a falling person, chosen above the worker where practicable and never a scaffold tube, guardrail or temporary fitting unless designed as such.

Fall arrest equipment stops a person after a fall has begun, while fall restraint prevents reaching the fall edge at all; restraint is preferred where the geometry allows and requires shorter lanyard length.

Measures such as toe boards, mesh, debris netting, tool lanyards, exclusion zones and covered walkways that keep materials and tools from striking residents, pedestrians or workers below.

A barricaded ground area beneath overhead scaffold work where entry is prohibited, marked with signs and controlled by a lookout so that people are not exposed to falling objects.

Arrangements for safeguarding residents and passers-by during facade works, including covered walkways, hoarding, warning notices, controlled access and advance notice of noisy or disruptive operations.

Management of contact with occupants of an occupied building during scaffold works, covering access to windows, air conditioners, drying racks, privacy, notice of work and handling complaints promptly.

The safe separation maintained between scaffold tubes, long materials and overhead power lines, with de-energising or isolation arranged where the required distance cannot be kept.

A visible status label fixed at the scaffold access point showing whether the scaffold is safe for use, who inspected it and when, and prohibiting use when it is incomplete, altered or found defective.

The prescribed inspection certificate under the Construction Sites (Safety) Regulations, completed by a competent person after erection, alteration, impact or a specified interval, and kept available on site.

A visual and functional check carried out by the scaffolder before starting work each shift, covering anchors, couplers, boards, guardrails, access and personal protective equipment, with defects reported immediately.

The process of recording and escalating any unsafe scaffold condition to the supervisor so that work stops, the scaffold is tagged out and repairs are made and re-inspected before use resumes.

Notification of accidents, dangerous occurrences and near misses to the contractor and, where required, to the Labour Department, with the scene preserved and details recorded for investigation.

Pre-arranged procedures for rescue of a suspended worker, fire, structural movement or severe weather, including rescue equipment, trained rescuers, communication and assembly points.

A medical emergency caused by prolonged hanging in a harness, which reduces blood return to the heart; a fallen worker must be rescued quickly and not stood upright abruptly.