Trench collapse at work: NSW workers compensation guide

Trench collapse at work can occur through a trench wall failing and soil moving into the work area and shoring, shielding or an adjacent structure shifting or collapsing. The incident history should identify the task, equipment, location and sequence of events rather than relying on the job title alone.

People commonly exposed include civil, plumbing, drainage and utility workers inside or beside trenches and plant operators, spotters and supervisors. Employment records should identify each person's task, employer and position in the work area when the incident occurred.

Medical records after a trench collapse at work may identify crush injury and respiratory injury. Each diagnosis should be linked to the event or exposure and to the worker's actual functional change.

After a trench collapse at work, immediate reporting and safety records may include rescue chronology, emergency call and scene-preservation records and excavation inspection, geotechnical, shoring and ground-condition records. These records can establish what was known at the time without requiring the worker to repeatedly recount a traumatic event.

• SafeWork notification, inspector notices and photographs where the event was notifiable.
• If the facts may meet the WHS Act definition of a notifiable incident, the SafeWork notification reference, inspector correspondence and scene records, without delaying emergency assistance or other action permitted by section 39.

For a trench collapse at work, the first evidence to preserve includes trench dimensions, spoil and plant locations, water ingress and recent weather and records of shoring or shielding, benching, battering and any geotechnical advice used to control collapse risk. It is most useful when dates, people, equipment, duties and later medical histories tell a consistent account.

• Permit, SWMS, service plan and competent-person inspection records.
• Witnesses including rescuers and plant operators.
• Hospital, respiratory, crush, neurological and psychological treatment records.

Medical and psychological evidence after a trench collapse at work may include first-aid, ambulance and early clinical histories describing the trench collapse at work sequence and diagnosis-specific examination, imaging and specialist evidence for crush injury, respiratory injury, spinal fracture, multiple injuries. A diagnosis alone may not answer causation or capacity: the records should explain the work event, symptoms, treatment and practical restrictions.

• Certificates of capacity stating functional restrictions, hours and treatment rather than only a diagnosis.
• Operative, rehabilitation and psychological records where the event caused surgery, prolonged recovery or trauma symptoms.

After a trench collapse at work, an insurer may dispute whether symptoms arose from burial, compression, inhalation or rescue and whether secondary psychological injury and later respiratory or neurological effects are accepted. The written decision should be answered with evidence directed to those stated reasons.

Crush, respiratory and multi-trauma effects may require urgent and later specialist care. Delayed nerve, kidney, respiratory or psychological symptoms should be documented rather than assumed. If treatment is disputed after a trench collapse at work, the request should explain the accepted diagnosis, expected functional benefit and reasonable alternatives.

Work capacity after a trench collapse at work may turn on confined excavation, uneven access, lifting, plant proximity and trauma triggers and whether retraining or a different work environment is required while restrictions continue. Proposed duties must be compared with the real task demands and the worker's ability to sustain them for the proposed hours.

Permanent effects may involve several body systems; each accepted condition is assessed under its own NSW method once stable. The accident mechanism, surgery, imaging finding or pain report alone does not establish a WPI percentage. Any WPI assessment after a trench collapse at work occurs after stabilisation under the NSW method for the accepted body system; the accident or surgery alone does not determine a percentage.

A principal contractor, excavation designer or other controller may need investigation separately from workers compensation. Any separate occupiers-liability, product, TPD or work injury damages issue is distinct from statutory workers compensation and depends on its own evidence and legal criteria. These issues are separate from workers compensation and depend on the particular facts.

For a trench collapse at work, assistance may involve separate the trench collapse at work mechanism from the diagnoses and identify any missing incident record and compare the insurer’s written reasons with medical, treatment and work-capacity evidence. The purpose is to identify the disputed decision and the evidence needed for the next step, not to promise an outcome.