Recently，The largest diameter pipe jacking machine made in China is jointly built by China Railway Construction Heavy Industry and China Construction Eighth Bureau.“Iron bugle”The cutter head broke through the wall.，It marks the realization of double-hole penetration of the largest diameter pipe jacking tunnel in China.。

The largest diameter pipe jacking machine made in China“Iron bugle”Out of the hole

The comprehensive pipe gallery of Yanziji New Town is a circular pipe jacking project with the largest section in China at the present stage.，It is an important part of Nanjing Jiangnan Ring Trunk Pipeline Gallery.，After completion, it will effectively improve the safety level of pipelines and the ability of urban disaster prevention and resistance.。The geological conditions and surrounding environment of the project are extremely complex.，It is necessary to cross the river、The ancient city wall、Municipal Road、Railway，Involving the relocation of many 220 KV high-voltage lines。Uneven hardness of stratum for pipe jacking、High requirements for land subsidence control，The construction is difficult、Extremely high security risk。

For complex jacking condition，China Railway Construction Heavy Industry and China Construction Eighth Engineering Group Co., Ltd.，Build together“Iron bugle”Slurry balance pipe jacking machine。Equipment excavation diameter 5.47 meters，The length of the main engine is about 7m.，The total weight of the whole machine is about 300 tons.，It is the first time to adopt the jaw rock crushing system in China.、Advance geological prediction system、Automatic Grouting Technology of Bentonite、Soil bin visualization technology, etc.，High degree of intelligence，Provide effective technical support for the smooth completion of Yanziji comprehensive pipe gallery project。

“Iron bugle”Slurry balance pipe jacking machine

So far，Hard Rock Pipe Jacking Machine Developed by China Railway Construction Heavy Industry Co., Ltd.、Quick topping machine、Retractable tube curtain machine、Top shield all-in-one machine，It has been widely used in diversion and drainage tunnels.、Power tunnel、Oil Pipeline、Underground engineering projects such as comprehensive pipe gallery，It is providing a comprehensive and systematic solution for the construction of urban underground pipeline network.。