地铁施工工法比较 英文版

Chapter3 Program comparison

3.1 summary

With the acceleration of the process of China's rapid economic development and urbanization, the existing road transport system has not meet the travel needs of the people.To ease the ever-increasing traffic pressure, China's major cities to speed up the construction of urban rail transit systempace. Comparative Analysis of rail transit and several other common way to travel, the rapid rail owns transit efficiency, energy saving, environmental protection, large volume, high speed, low pollution, low noise, low power, small footprint, safety, comfort, all-weather, etc.a unique advantage to solve urban traffic congestion, changing the urban layout. It has played a big role to achieve comprehensive management of urban environment and transport, and guide the city and take the road of sustainable development.

However, the tall buildings of the urban area-intensive, crowded, traffic, bus lines, subway station design is becoming increasingly narrow construction of space, around pipeline dense, close to existing buildings, ground with heavy traffic and many other constraints.

3.2 Several commonly used methods of subway station construction

Subway stations located in the city center, mostly, therefore,the selection of construction methods and structure type of subway station , mainly based on the

following aspects: (1)station function, station function mainly reflect from the station use effect and operation conditions, and the station use effect reflect from the capacity of the organization and distribution in passenger, equipment room decorate, operation management and utilization of underground space in comprehensive functions; (2) difficulty of construction, mainly from the difficulty of construction project itself, construction preparation of the implementation of the degree of difficulty, period and construction safety aspects of evaluation, embodied at the the maturity of construction technology and surface subsidence control, construct objects demolition, pipeline move and protection; (3) environmental impact of construction, environmental impact on the construction mainly embodied in the influence of urban traffic and urban living, the influence of the commercial activities, and pollution to the environment, etc. Subway station construction method has a lot kinds, commonly used in China are now open cut method, cut-and-cover method, cover excavation method and hybrid method,etc. Which cut-and-cover method consists of the bottom up and top down;

3.2.1 open cut method

Open-cut method is the traditional construction method of the ground frame structure.First of all, make the foundation pit on the ground, and then excave the soil from top to bottom, plus support when necessary to prevent the deformation of foundation pit,when excavation in the end facilities for the framework from the bottom up.The construction technique of open-cut method is simple, rapid, and economy, so the