剑桥英语3听力
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Of course modifications to house will be necessary at a site like this and they come at a significant cost to the developer and home modifications I am about to outline will add about $25,000 to the price of a newty-built will still mean a cheaper house than in a less noisy and more desirable area.
A bit of background would not go astray.I understand that you are all familiar with the proposed development site at Manchester Park.
It's particularly difficult one in terms of noise with the highway along the eastern perimeter and the Blacktown airport not 3 kilometres away to the north.
Of course,those nearest the highway will be the worst hit,with heavy traffic noise as well as the noise from the light planes you all know,the normal noise threshold for private housing is 55 this site the levels have been recorded s high as 67 decibels.
剑桥英语3听力2The construction of the houses has to be somewhat modified from houses in most the houses on the highway and in the noisiest areas of this site there will be a need for specialised double glazing and special acoustic seals will have to be fitted to the exterior doors in this especially noisy pocket will have to be solid core wood doors with y house built on this site,not just those adjacent to the highway or nearest to the airport,will require high density insulation materials in the only will all the roofs need insulating,the exterior walls will be required to be double ceilings will require double thickness plaster board to be used in the the noisiest areas mechanical ventilation will have to be installed in the exterior those areas with sealed windows it will be necessary to fit fans with absorbers to cut out the noise in those particular conditioning units could also be fitted in the ceilings of such houses but this is substantially more expensive than fans,and may not be needed on this site.
剑桥英语3听力3Coming back now to the double glazing I mentioned ialised double glazing requiresa larger air gap between the inner and outer glass than normal double gap must beat least 7 thickness of the glass is also a factor,8 millimetres on the outsideand 6 on the inside is essential that the glass be thicker on the outside that on theinside and that the gap between the panes of glass be a minimum of 7 centimetres.
Obviously,the noise factor will have to be taken into consideration with the layout of ng areas will have to be designed at the back of the houses away from ooms and living rooms will have to be built towards the back,and for those housesclosest to the highway two layers of plasterboard will be needed for the interior e rooms constructed at the front of the houses should begarages,laundries,kitchens,bathrooms and dining rooms.
I have come to the conclusion that this development should go ahead,but with variousacoustic modifications according to the position of the block in relation to the highway andintersection.
剑桥英语3听力4Good afternoon.I'm Paula Bundell and I am giving you the lectures on Environmental Noise this y we are going to look into the effects of noise on a planned housing estate in a particularly difficult part of the new Manchester Park area.
This site is not as bad as some I have researched in the Blacktown airport is closed from 6pm to 7am and this is a great advantage to the only noise after dark is from the highway and the traffic is somewhat reduced between 7.30pm and ,the people most affected by the noise will be.I expect, the time most of the students and workers have arrived back home in the evening during the week the noise will have abated to a fairly large weekends are still a problem of course,but the traffic is certainly reduced on Saturdays to a large extent and even more so on Sundays.
