Construction method for splicing duct pieces in shield idling manner

Abstract

The invention discloses a construction method for splicing duct pieces in shield idling manner. The method comprises the following steps of: respectively dividing shield and mining method constructionlengths according to the length of a shield remaining segment, while a shield machine continues the forward tunneling, carrying out opposite mining method excavation from a hoisting-out well to the direction of the shield machine, enabling an excavation section to be larger than a cutterhead of the shield machine, and strengthening primary supporting measures; after mining method excavation is completed according to task division, blocking a joint end wall, and constructing a shield tunneling guide table in a mining method section; and after the shield tunneling machine reaches the end wall and walks into the guide table, conducting segment splicing in an idling mode to pass through the mining method tunnel, and meanwhile conducting segment back backfilling and grouting till the shield tunneling machine reaches the hoisting-out well. The method is suitable for long and large shield tunnels of which the shield segment receiving ends are high in rock strength and have more developed rock cracks and which are complex in geological condition, thus need construction period optimization or need to be connected with a shield machine and are suitable for mining construction, the construction progress can be greatly improved, and good economic benefits and social benefits are achieved.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, relates to subway construction, and in particular relates to a construction method for shield tunneling by empty pushing and joining segments. Background technique [0002] With the continuous development of the economy, my country's urban subway and intercity rail transit projects are developing rapidly. The construction of urban underground tunnels mostly uses the shield method and the underground excavation method, and the shield method construction is characterized by its strong adaptability to the stratum and safety High, fast construction and other characteristics gradually replace the traditional underground excavation method. [0003] Due to the complex geological conditions in our country, there are tunnels that are soft at the top and hard at the bottom, or a tunnel has both hard rock and soft rock. When the shield machine is working in such a stratum, there are problems such...

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Problems solved by technology

[0003] Due to the complex geological conditions in our country, there are tunnels that are soft at the top and hard at the bottom, or a tunnel has both hard rock and soft rock. When the shield machine is working in such a stratum, there are problems such as tunneling difficulties, severe tool wear, and difficulty in guaranteeing the construction period.

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