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    At this time the double shaft chariot developed as a transport vehicle which was light and easy to handle. During the Eastern Han (25-220 CE) and later during the Three Kingdoms Period (220-280 CE), the double shaft chariot was the predominant form. This change is seen in innumerable Han Dynasty stone carvings and in many ceramic tomb models.

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    Shaft mining or shaft sinking is excavating a vertical or near-vertical tunnel from the top down, where there is initially no access to the bottom.. Shallow shafts, typically sunk for civil engineering projects differ greatly in execution method from deep shafts, typically sunk for mining projects.When the top of the excavation is the ground surface, it is referred to as a shaft; when the top ...

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    Nov 18, 2019· Design and Construction of Deep Shaft Concrete Linings in the UK. Tuesday, November 19, 2019 9:20 am. Design and construction of deep shaft concrete linings in the UK will be reviewed, to set out the principles for future designs, including the design load to be adopted and Factors of Safety to be used in the design.

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    Shaft Construction. Generally, shafts are constructed from the ground surface down, using conventional shaft sinking methods. However, in rock tunnelling projects, shafts not used for primary construction access can be constructed using raise boring. In raise boring, a mall pilot hole is drilled from the ground surface to tunnel depth.

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    A mine-shaft elevator fell at the Markham Colliery. Chesterfield, England: 12 0 30 October 2008 An elevator plunged to the ground at a construction site. Xiapu County, China: 11 2 25 April 2019 An elevator fell at a construction site due to a snapped cable. Hengshui, China: 11 4 29 July 2011 A mine-shaft elevator fell at the Bazhanov coal mine.

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