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Structural safety of reinforced autoclaved aerated concrete (RAAC) planks
A Theme Page to raise awareness of and encourage knowledge sharing on the structural safety of RAAC planks.
CROSS Theme Page
Region: CROSS-UK, CROSS-AUS, CROSS-US
Failure of cast-in wire lifting loops on manhole cover slabs
A cast-in wire lifting loop failed when lifting a 4m diameter precast manhole cover slab into place.
23 May 2022
CROSS Safety Report
Report ID: 629
Region: CROSS-UK
Failure of prestressed hollowcore units during storage and transport
A reporter shares their experience of the failure of prestressed hollowcore units during storage and transport.
1 June 2022
CROSS Safety Report
Report ID: 748
Region: CROSS-UK
Concern over concrete test methods used on site
A reporter is concerned about the test method a contractor uses to justify the strength of concrete placed on site.
13 December 2022
CROSS Safety Report
Report ID: 840
Region: CROSS-UK
Accidental partial demolition of a beam
During a site visit, the permanent works design engineer noticed that hydro-demolition of the end of a floor supporting beam had taken place out of sequence. This introduced a pattern of bending moments and shear forces that were not considered in the original design.
6 April 2023
CROSS Safety Report
Report ID: 855
Region: CROSS-UK
Temporary instability of columns
Concerns were raised by a reporter on the temporary stability of concrete columns during construction.
2 February 2023
CROSS Safety Report
Report ID: 872
Region: CROSS-UK
Incorrect lifting system used for precast concrete stair elements
A reporter was asked to inspect a precast concrete stair unit which was exhibiting cracking around the lifting anchor locations after being de-moulded.
13 December 2022
CROSS Safety Report
Report ID: 883
Region: CROSS-UK
Precast concrete panel fixing
A 1960s flyover was being demolished and an interesting feature came to light how the precast concrete edge panels were fixed.
30 June 2022
CROSS Safety Report
Report ID: 965
Region: CROSS-UK
Waterproofing exposed concrete slabs
This report highlights that water ingress into buildings continues to be a problem and discusses the role of the structural engineer when dealing with waterproofing of exposed concrete slabs. It shows how this can be achieved by careful design and detailing of the reinforced concrete structure and by close collaboration of all parties involved.
25 November 2021
CROSS Safety Report
Report ID: 959
Region: CROSS-AUS
Grouting of joints between load-bearing prefabricated concrete members
This report highlights the risk of failure if grouted joints between load-bearing prefabricated concrete members are not designed and installed correctly.
30 April 2021
CROSS Safety Report
Report ID: 961
Region: CROSS-AUS
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