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Ronan Point was a 22-storey tower block in Newham, East London, which partly collapsed on 16 May 1968 when a gas explosion demolished a load-bearing wall, causing the collapse of one entire corner of the building. Four people were killed in the incident, and 17 were injured. Although casualties were relatively light, the spectacular nature of the failure -caused by both poor design and poor construction- led to complete loss of public confidence in high rise residential buildings, and major changes in UK building regulations resulted. Ronan Point, named after Harry Louis Ronan (a former Chairman of the Housing Committee of the London Borough of Newham), was part of the wave of tower blocks built in the 1960s as cheap, affordable prefabricated housing for inhabitants of the West Ham region of London. The tower was built by Taylor Woodrow Anglian using a technique known as Large Panel System building (LPS), which involves casting large concrete prefabricated sections off-site and bolting them together to construct the building. The precast system used was the Danish Larsen & Nielsen system.〔(【引用サイトリンク】title= Failure of a High-Rise System )〕 Construction started in 1966 and was completed on 11 March 1968. ==Construction== There are three main methods of constructing tall buildings: *Steel building. Here a set of steel members are fixed together to make the frame of the building. Skyscrapers in New York City like the Empire State Building are examples of this type of building. *''In situ'' concrete. Here a mould or formwork is made using wood or another similar material. Steel reinforcement is placed in the formwork, then concrete is poured into the mould and allowed to set. The mould is removed, and may be reused to make identical castings in other areas of the building. The resulting building is a solid block of concrete made from multiple castings poured on top of one another. The Bank of America Tower in New York is an example of this. *Large panel systems (LPS). Here a set of prefabricated concrete parts are transported to the site, where they are lifted into place with a crane and joined together. This is the type of structure that Ronan Point used. It is thought that a failure to join the panels correctly contributed to the Ronan Point collapse. The structure of Ronan Point and other LPS buildings of the time relied on gravity holding everything together.〔(【引用サイトリンク】title= Ronan Point )〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Ronan Point」の詳細全文を読む スポンサード リンク
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