ACOUSTICS
the wall with a sledgehammer so that the whole wall collapsed.
Although this was an effective and efficient means of removing the walls, the sudden crash of sound as the debris hit the floor was extremely loud. Sound thus created is transmitted through the structure of the entire building, and may be heard in many locations throughout. Consequently, estates and facilities managers need to be aware of the sound associated with construction-related activities taking place on site.
Monitoring of building demolition and construction sound levels In sizeable hospital projects – for example those entailing the construction of a new large building, which in some instances also require demolition of existing building, sound monitoring is a necessity, especially as the demolition work and construction activity are often taking place adjacent to other existing buildings. It is indeed always good practice to monitor sound levels during demolition and construction work on hospital sites in order to preserve reasonable sound levels in and around nearby buildings still in clinical or non-clinical use. I adopted the practice of issuing ‘Acoustic Report Sheets’ to construction companies to complete, on which they could detail any forthcoming scheduled significantly noisy activities. This enabled any departments on the existing hospital site to take appropriate action at such times so that they could continue with their work effectively. These sheets would usually be issued once a week, with the request that any predicted noisy activities in the course of the week including, for example, periods of high delivery activity
100,000
The three dots shown are data points to give a little guidance for wet sand and clay soil, although the graph is for soft clay only.
10,000
1000
100 5 10 15 20 Frequency (Hz)
Figure 1: Frequency of vibration versus soil pressure for soft clay, showing maximum and minimum values.
100,000 25 30 35
The dot shows a data point to give a little guidance for dry sand and gravel soil, although the graph is for hard clay only.
10,000
1000
100 5 10 15 20 Frequency (Hz)
Figure 2: Frequency of vibration versus soil pressure for hard clay, showing maximum and minimum values.
25 30 35
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January 2021 Health Estate Journal 39
Soil pressure (kg/m2
)
Soil pressure (kg/m2
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