The eyebolt is the means by which a worker can be lowered down a building safely while working at height. However, there are a variety of different eyebolts which will be chosen according to the material into which the eyebolt is to be fixed.
For solid brickwork, provided the brickwork is sound and the mortar in good condition, a resin socket type eyebolt can be used: this is an eyebolt screwed into a socket set in resin. However, many of the buildings in the UK constructed of solid brickwork are at least 80 years old, and as such the bricks have weathered and the mortar joints are weak. Trial tests need to be done in order to assess the safety or otherwise of the brickwork. If it turns out that it is weak, then a through fixing into a solid backplate could be considered.
Work positioning eyebolt installation into concrete is also usually of the resin socket type. Most concrete is perfectly strong enough to do the job provided the installation is carried out correctly. However, if there is any doubt, work positioning eyebolt testing must again be undertaken.
For cavity brickwork, the only choice is really a through fixing. Here an anti-compression tube needs to be used in order to prevent the cavity from collapsing when the nut is tightened, either when the eyebolt is installed or when it is subsequently tested as required by law.
No comments:
Post a Comment