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GCP from wikipedia.
The tower was raised as a part of Charles Barry's design of a new palace, after the old Palace of Westminster was destroyed by fire on the night of October 16, 1834. The tower is designed in the Victorian Gothic style, and is 96.3 m (316 ft) high.
The 61 m (200 ft) tower consists of brickwork with stone cladding; the remainder of the tower's height is accounted for by a framed spire of cast iron. The tower is founded on a 15 by 15 m (49 by 49 ft) raft, made of 3 m (9 ft) thick concrete, at a depth of 7 m (23 ft) below ground level. The tower has an estimated weight of 8,667 t. The four clock faces are 55 m (180 ft) above ground.
Due to ground conditions present since construction, the tower leans slightly to the north-west, by roughly 220 mm. It also oscillates annually by a few millimetres east and west, due to thermal effects.
Also from wikipedia on the Palace of Westminster regarding the stonework.
The stonework of the building was originally Anstone, a sand-coloured magnesian limestone quarried in the village of Anston in South Yorkshire. The stone, however, soon began to decay due to pollution. Although such defects were clear as early as 1849, nothing was done for the remainder of the 19th century. During the 1910s, however, it became clear that some of the stonework had to be replaced.
In 1928 it was deemed necessary to use Clipsham Stone, a honey-coloured limestone from Rutland, to replace the decayed Anstone. The project began in the 1930s, but was halted due to the Second World War, and completed only during the 1950s. By the 1960s, however, pollution had once again begun to take its toll. A stone conservation and restoration programme began in 1981, and ended in 1994. |
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