Abstract: The ingate of Metro tunnels is one of the weak parts of the tunnel structure and also is a critical point in the stress transformation of the tunnel structure during construction. Effective construction technologies have to be adopted, so as to avoid the collapse of the crown during the ingate construction. The impacts of the engineering geological and hydrogeological conditions, the surrounding environment and the position of the vertical shaft on the construction risk of ingates are analyzed, and the comprehensive construction technologies for the construction of the ingates of Metro tunnels are systematically summarized, with the construction of the ingates of Beijing Metro as an example.

Key words: Metro tunnel, ingate, construction risk, design, construction technology