May 30，Jointly built by China Railway Construction Heavy Industry and China Railway 11th Bureau，Applied to Shenjiang Railway ProjectSJSG-The earth pressure balance shield machine with the largest diameter of the domestic composite stratum tunnel constructed in Bid 7“Kunpeng”（Shenjiang 3）Smooth start。

Shenjiang Railway ProjectSJSG-Section 7 is one of the key and difficult control projects of Shenjiang Railway.，The total length of tunnel is 3.84 kilometers、The maximum buried depth is 62 meters.，Belon to a large-diameter single-hole double-track railway tunnel.。The section mainly passes through moderately weathered、Strong weathering、The soil is strongly weathered granite、Completely weathered granite，Partial crossing of silt、Silty clay，Need to underpass the river、Highway、Bridges and other risk sources，With large excavation section、The burial depth is large、Complex geological conditions and so on.，It poses a great challenge to the safe construction.。

In order to meet the construction requirements of the complex geological conditions of the project，China Railway Construction Heavy Industry Co., Ltd. combines rich design and application experience in the past.，Tailor-made“Kunpeng”Shield machine。Equipment excavation diameter 13.24 meters，Total installed power 9300 kW，The total weight is about 3400 tons.，It is the largest diameter earth pressure balance shield machine for composite stratum tunnel in China independently developed by Railway Construction Heavy Industry.。“Kunpeng”The shield machine is not only equipped with a telescopic main drive、Ynchronous single and double liquid grouting、Innovative technologies such as air-assisted tunneling，It also carries the synchronous assembly of integral large box culvert.、Box culvert fine adjustment and many other advanced functions，It can effectively deal with various complex geological conditions such as uneven hardness.，It provides a strong guarantee for the smooth construction of Shenjiang Railway Project.。

Shenjiang Railway is located in the center of Dawan District.，It is not only our country“Eight vertical and eight horizontal”An important part of the coastal corridor of the high-speed rail network，It is also the main cross-river inter-city corridor in the Pearl River Delta region.。After the completion of the project, the life circle of Guangdong-Hong Kong-Macao Greater Bay Area will be realized.、Half-hour high-speed rail interconnection in the economic circle，It has become a strong support for further strengthening the integrated development of Dawan District and the construction of Guangdong Free Trade Zone.。