Structural Safety Information and Reports

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Failure to grout steel frame bases

A reporter describes a problem that arose during the construction stage of a project when a steel frame supporting pipe and cable racks was loaded before the frame baseplates were grouted.

Modern methods of construction and robustness

This report relates to the design of a low rise modular building and the requirement, or otherwise, for positive fixings between the superstructure and the substructure.

Inadequate design for basement works

An inadequate structural design for alterations to a basement led to structural distress within a substantial five-storey townhouse.

Control of temporary works excavation

Poor, high-water content excavated material, slipped into a 15-20m deep borrow pit. The material had slipped to the bottom of the pit partially burying excavation, crushing and screening equipment. If this slip had occurred during working hours, the impact could have been very serious.

Tower crane base designs

A reporter’s firm has been involved in the design and checking of numerous tower crane bases and have come across many examples where the supplier of the tower crane has supplied incorrect loadings. These incorrect loadings could have led to crane failures had the errors not been spotted.

Object rolling into live carriageway

A disc of concrete rolled from a construction area onto a live carriageway, colliding with a passing vehicle.

Delay by party wall surveyor adds to risk

A party wall surveyor causes delay which prevents a dangerous wall from being made safe in a timely manner.

Unsafe working platform

A reporter came across an access platform supported next to an excavated foundation with unstable sides while carrying out an inspection on site.

Unsafe instructions from a building inspector

On the site for an extension to a domestic property, a building inspector instructed a contractor to excavate a deep trench. The trench was in front of the neighbour's adjacent boundary retaining wall, and left a deep vertical face under the house being extended.

Column stability during erection

A reporter highlights the importance of ensuring steel columns are temporarily supported until they are sufficiently tied and supported by the permanent structure.

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Failure to grout steel frame bases

Modern methods of construction and robustness

Inadequate design for basement works

Control of temporary works excavation

Tower crane base designs

Object rolling into live carriageway

Delay by party wall surveyor adds to risk

Unsafe working platform

Unsafe instructions from a building inspector

Column stability during erection

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