Formwork and False Work Hazards in Construction: Status and Effects in Bloemfontein, South Africa

Mothokho, Liteboho; Emuze, Fidelis; Aka, Adefemi

doi:10.32738/ceppm.201509.0004

Cited by 3 publications

(2 citation statements)

References 5 publications

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“…Possible failures of formwork can be caused by mistakes during erection, wrong calculations of weight acting on the formwork, extra loads, or natural disasters [3]. Several worker interviews were conducted in order to establish the most common hazards on construction sites caused by falsework [4]. They have concluded that the main cause of formwork and falsework accidents on sides is due to the lack of planning, stripping of formwork, falling objects, floor collapse, and mishandling of material.…”

Section: Introductionmentioning

confidence: 99%

Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

2019

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Ultra-high performance concrete (UHPC) is a durable material that allows the construction of innovative structural elements and conforms with accelerated bridge construction (ABC) goals. The main idea of this research is to utilize UHPC to prefabricate a shell that acts as a stay-in-place form for bridge columns. The prefabricated shell eliminates the conventional formwork while reducing the on-site construction time and acting as a durable protective layer for the normal concrete inside the shell against environmental attacks. In addition, the UHPC shell provides additional confinement to the column concrete, which improves the column's structural performance. During construction and after completing the column reinforcement work onsite, based on the conventional construction methods, the prefabricated UHPC shell is placed around the column reinforcement, followed by casting a portion of UHPC for a column-to-footing connection, which improves the capacity of the connection and shifts the plastic hinge zone above the connection. Once the UHPC portion hardens, normal concrete is placed inside the shell, forming a permanent concrete-filled UHPC shell. The construction process is finalized by placing and connecting a prefabricated cap beam to the column through the same developed connection as that in this research. This technical note presents the development of two test specimens using an UHPC shell in lieu of a conventional formwork with the advantage of improving the column performance and durability.

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Section: Introductionmentioning

confidence: 99%

Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

2019

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“…Furthermore, formwork failure can occur during concrete pours and can cause leakage of concrete, leading to possible complete structural collapse, injuries, and fatalities. Based on several interviews from construction workers, it was concluded that the most common formwork and falsework failures are because of lack of planning, falling objects, stripping of formwork, mishandling of material, and floor collapse ( 2 ).…”

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confidence: 99%

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

Caluk

Mantawy

Azizinamini

2020

Transportation Research Record

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Ultra-high performance concrete (UHPC) is a durable material that can be used in constructing new and unique structural elements. This research utilizes UHPC to construct prefabricated shells that act as stay-in-place forms for bridge columns and eliminate the use of traditional formwork. These innovative structural elements reduce the on-site construction time, improve the structural performance of the column, and act as a protective layer in aggressive environments. Generally, during the construction process, the prefabricated UHPC shell is placed around the column reinforcement, which is fabricated using conventional methods. To connect the UHPC shell and column reinforcement with the footing and footing dowels, a step made of UHPC is utilized. The UHPC step connection is designed to shift the plastic hinge away from the column-to-footing interface. In the next stage, normal concrete is cast inside the shell, forming a concrete-filled UHPC shell. The final stage of construction involves placing and connecting a prefabricated cap-beam using the same UHPC step connection. The column specimen was tested under constant axial load and incremental lateral load. In this test, the UHPC shell cracked on the north side at a drift ratio of 3%; however, the column had a significant capacity and behaved similarly to a conventional reinforced concrete column during higher cycles of drift ratios. The test was completed after the column had reached a drift ratio of 7.5% when the first bar ruptured. No damage occurred in the footing and UHPC step which proved that the design was successful in shifting the plastic hinge away from the column-to-footing interface.

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Analysis of workers’ fall accidents due to formwork operations

Chellappa

Salve

2022

Proceedings of the Institution of Civil Engineers - Forensic En

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In the construction industry, fall accidents are a critical form of accident. This research examines fall accidents in formwork operations that occurred between 1995 and 2015. This study examines the different dimensions of fall incidents, such as the level of severity of formwork activities, fall height and causes of falls using the 205 construction industry accidents reported in the Occupational Safety and Health Administration (OSHA) database, a regulatory agency in the USA. The findings revealed that most fall incidents occur at the height of less than 9.1 m (30 ft), mostly due to unprotected or unguarded edges or floor covering. Furthermore, erection and stripping activities were found to have severe risks to carpenters and moreso to the general workers who tend to have more chances of meeting such accidents; additionally, human error can also be observed. These results are intended to alert safety authorities of the need to examine the existing state of fall incidents and formulate strategies to minimise them in the future. Since OSHA does not provide in-depth information for each incident, it was impossible to ascertain the exact situation and formwork type in use at the event.

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Formwork and False Work Hazards in Construction: Status and Effects in Bloemfontein, South Africa

Cited by 3 publications

References 5 publications

Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

Durable Bridge Columns using Stay-In-Place UHPC Shells for Accelerated Bridge Construction

Cyclic Test of Concrete Bridge Column Utilizing Ultra-High Performance Concrete Shell

Analysis of workers’ fall accidents due to formwork operations

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