September twenty eighth，The host machine of the first domestic whole-ring pipe section connecting channel roadheader successfully completed the sleeve receiving in the project.，It marks the leading role of Guangzhou Metro Group.，China Railway Construction Heavy Industry and Guangzhou Metro Design Institute、CRCC South China Construction、Guangdong China Tunnel、Many units, such as Sun Yat-sen University, undertook the project of unveiling the list in Guangzhou.《Development and Application of Complete Equipment for Underground Engineering of Rail Transit in Complex Environment》，Construction equipment for low clearance pile foundation、After the completion of the demonstration project application of the open caisson shaft boring machine，Achieve new breakthroughs again。Successful Application of the First Home-made Tunneling Machine for Connecting Passage of Integral Ring Pipe，It is also the first inter-city railway mechanical communication channel in China.，Achieve important scientific research results。

The tunnel runs through

It is understood that，The connecting passage project is located in the section from the south of Houtong Section of Guangzhou Metro Line 22 to Xilu.，The working conditions are extremely complex。The stratum is highly weathered argillaceous siltstone.、It is overlaid with weak sand layer、Silt，The depth of the tunnel is about 27 meters.，High formation water pressure。There is an elevation eccentricity of 250mm between the connecting passage and the main tunnel，And a relatively large include angle exists between that connecte passage and the main tunnel.。It is the first time in China that the integral ring pipe joint is used in the mechanical connection channel.，Compare with that previous block pipe joint form,，It greatly improves the waterproof and structural stability of the tunnel.。

In-plant photos

In order to cope with the complex working condition，China Railway Construction Heavy Industry Co., Ltd. has independently conquered the rapid breaking technology of high-strength segments.、Retreat technology of whole ring pipe joint、Pose rapid adjustment and many other key core technologies，It is equipped with on-line condition monitoring and fault diagnosis technology.。Since the equipment was installed on September 1.，The construction of the connecting passage was completed in less than one month.，Maximum daily footage 2 ring pipe joint，It takes about one and a half hours to complete the oblique breaking of high-strength segments.，The high efficiency and reliability of the equipment are fully verified.。

Construction site

Relying on the scientific research project of Guangzhou Jiebang，Application of TBM in Intercity Railway Tunnel Demonstration Project Completed by Railway Construction Heavy Industry，Now it has formed a small diameter subway tunnel of 6 meters.、Intercity railway tunnel of 9 m medium diameter、Full coverage of 15-meter super-large diameter highway tunnels and other application scenarios。