Closed origin and arrival construction method of shield machine

Abstract

The invention discloses a closed origin and arrival construction method of a shield machine, comprising the following steps: (1) using a tight continuous wall enclosure structure as a plain concrete continuous wall; (2) opening slanting periphery observation holes on a cavity door to observe the stable and leak conditions of soil bodies; (3) chiseling concrete and steel bars on the cavity door sectionally, and using plain concrete to replace the original continuous wall synchronously; (4) installing a receiving device of the shield machine, and applying pre-applied force; (5) filling materials in a steel sleeve barrel of the receiving device to a request height; (6) testing the pressure resistance of the steel sleeve barrel; (7) carrying out the digging construction of the shield machine until a shield tail of the shield machine enters or separates the cavity door; and (8) decompressing and disassembling the steel sleeve barrel of the receiving device. The closed origin and arrival construction method of the shield machine is safe, economical, efficient and simple, changes uncontrollable factors into controllable factors in a shield origin and arrival process, greatly reduces risks in a construction process, better controls land subsidence and provides the effectively ensured closed origin and arrival construction method of the shield machine.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for the sealed departure and arrival of a shield machine in tunnel construction. Background technique [0002] The shield construction method is a kind of tunnel excavation and lining operations safely carried out in the machine while preventing the soft ground excavation surface from collapsing or maintaining the stability of the excavation surface by using a shield machine to excavate underground. Tunneling method of construction. [0003] Shield departure and arrival technology refers to the treatment of the end of the portal before the shield tunneling (reinforcement of soft strata and high groundwater geological conditions), excavation of the portal, design and processing of the shield departure and receiving base, Positioning installation; support system, installation of door ring, shield machine assembly and disassembly measures, so as to ensure ...

AI Technical Summary

Problems solved by technology

[0013] ① When the freezing method is used for ground reinforcement, the freezing period generally takes 40d to 60d, which requires a long construction period, and mechanical freezing requires a large amount of electric energy, which greatly increases the construction cost

[0014] ② The frost heaving of the soil layer caused by the freezing method construction has a great impact on the surrounding environment

However, the steel plate replacement method also has certain limitations. For example, when the steel sheet pile is pulled out, it takes a long construction period, requires a high site, and has a large disturbance to the soil. It is not suitable for use when the surrounding buildings are close , After the shield machine is sealed and started, it is prone to "kowtow" phenomenon and other problems

[0019] This construction method is suitable for most of the shield starting construction method, and this construction method has not yet been adopted for the shield machine arrival and reception