Abstract
To protect themselves against fall hazards in a slab-column frame, workers use the row of shoring jacks installed at 1 m from the edge as supports for on-site built guardrails. Inspectors of the Quebec Workers Compensation Board (Commission de la sante et de la securite du travail (CSST)) have expressed concern about the safety and compliance of these on-site built guardrails with the Quebec Safety Code for the Construction Industry (S-2.1, r.4). Some workers have also inquired if the shoring jack can be used as an anchor for a travel restraint system. The present study describes how an evaluation method and a test protocol have been used to verify if guardrails built on-site, with shoring jacks as supports, are safe and comply with the requirements of S-2.1, r.4 and if the shoring jack can be used as an anchor point for a travel restraint system. The results of the study show 1) guardrails built on site with shoring jacks as supports, are safe and comply with S-2.1, r.4 and 2) shoring jacks used as supports for guardrails must not be used as an anchor for a travel restraint system.
Highlights
The construction of cast in place reinforced concrete structures is fundamentally one of most economical systems of construction (1)
The shoring jacks are installed at 1.83 m centre to centre as on sites with the prefabricated wooden guardrail of Figure 2 (c)
The results of tightening tests (Tests 1-la, 1-lb et 1-lc) from Table 3 show that the compressive force that a worker can generate in a shoring jack tightened between two concrete slabs with a handmade tool is 18 to 20 kN, whether the screw of the shoring jack was dry or oiled
Summary
The construction of cast in place reinforced concrete structures is fundamentally one of most economical systems of construction (1). A building technique frequently used consists of erecting the column-slab frame and carry out the finish work at each floor as the construction progresses. This method of construction involves formwork reuse. After the slab has been cast, formwork and shoring jacks have to be kept in place long enough to allow the concrete to develop sufficient strength to prevent hairline cracks or failure in the concrete. Shoring jacks allow concrete to reach its full strength. This prevents excessive sag, distortion, cracking and/or other damage from occurring to the new slab. Workers can start erecting formwork for the floor
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