Accident Advisory Against Demolition Work

Demolition Work

Accident Advisory Against Demolition Work

Accident Advisory Against Demolition Work

4th March 2019, 2 workers fell through a floor slab which gave way when they were hacking a parapet wall on the second storey of a private dwelling.

They were standing on the floor slab when it suddenly gave way and collapsed causing both of the workers to fall to the ground. One of the workers was trap beneath the concrete debris and was pronounced dead at the scene by attending paramedics while the other sustained injuries

Accidents like this may be prevented and we hope employers and workers will take extra precaution when working on demolition works. Do read thru our recommendation as to what should be done when dealing with demolition work.

Pre-Demolition Survey

Do ensure that a professional Civil Professional Engineer (PE) has done a detailed survey and examination of the surrounding and building before any form of demolition work is carried out. Do not carry out any demolition work without the approval of the Civil Professional Engineer.

Try to identify any hazards with regards to the demolition work with these non-exhaustive steps

  1. Site walk investigation
  2. Inspect all plans of the building thoroughly
  3. Perform all relevant assessment to establish the condition of the building
  4. Examine and verify all applicable information given by the building owner

Demolition Plan

It is necessary to set up a demolition plan before carrying out any demolition work. With a proper demolition plan in place, this will ensure that all demolition works are being done in a correct and safe manner.

A demolition plan should include but are not limited to the following:

  1. Site Plan

location of the building, detailed topography of the site and its surroundings, distance to adjacent buildings, streets and structures.

  1. Building layout plan (for every floor of the building to be demolished)

Design loads, structural support systems, materials of construction, condition of the building.

  1. Method statement

Procedure for demolition, the sequence of demolition for structural members, method of demolition including machine(s) to be used, shoring and supports required (e.g. for suspended floors), measures for the protection of the public (e.g. hoardings, covered walkways), the method for handling and disposal of debris.

  1. Supervision plan

Pick a site supervisor and determine at which stage(s) of the demolition will the PE inspect the demolition site.

If the demolition work requires taking down any column, beam, floor or other load-bearing structure, make certain that the work is only performed while taking into consideration the strength of the remaining structure and it is in line with the method statement set by a PE.

Stability Assessment

Before any demolition work can be carried out. One should always perform a stability assessment, which should be logged in a stability report. A stability assessment will determine the structural stability of the building as it is being demolished.

A stability report should include but are not limited to the following:

  1. Stability of the building during each stage of demolition.
  2. Stability of other neighbouring building, adjoining properties, connecting walls, streets, land and services which may be affected by the demolition.
  3. The calculation to show that any powered machinery being used will affect the safety of, or cause damage to, any building, structure, street, land, services, temporary supports and bracings.
  4. The calculation to show for any temporary and permeant support that are required to support neighbouring building, adjoining properties and connecting walls.
  5. The calculation to show that the demolition work will not cause any form of a safety issue or cause any form of harm to building, structure, street, land and services.

 

Structural Supports

Make sure that any location which requires temporary support is set beforehand. As the removal of any particular part of the building or structure during the demolition process can result in other parts of the building being unsafe.

While doing demolition work always remember to establish temporary support being removing any current support which are holding up structural loads. Ensure that the supports are strong enough and place on a secure and effective foundation to protect the structural integrity. The support should also be sufficiently laced and braced. These supports should also be inspected before and during any form of demolition work for their strength.

If there’s even a slight chance that any neighbouring structure is unsafe or will be in unsafe condition because of the demolition work, no demolition work should be done until all necessary support is provided to guarantee the stability of the neighbouring structure and to prevent the structure or other property from crumbling.

Personal Protective Equipment (PPE)

Ensure that all workers are equipped with the proper personal protective equipment and make sure they are all wearing the correct personal protective equipment correctly at all times when they are dealing with demolition work.

 



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