Installation and use method of active support prefabricated secondary lining for shield tunnel

Abstract

The invention discloses a method for installing and using an active support prefabricated secondary lining for a shield tunnel, and relates to the technical field of tunnel construction. The lining is implemented in a manner of block prefabrication and on-site assembly. The way of applying prestress is to actively apply load to the existing segment lining structure from the inside, improve the stress state of the segment lining structure, and form a common bearing structure system composed of the secondary lining and the segment lining structure, so as to achieve timely control The effect of segmental lining structure deformation. The invention can realize the active support for the segment lining structure of the shield tunnel, form a common load-bearing structure system with the segment lining structure in time, and can effectively control the deformation of the segment lining structure, thereby maximally protecting the bearing capacity of the segment lining structure performance, with high engineering practicability.

Description

technical field [0001] The invention belongs to the technical field of tunnel construction, and in particular relates to an installation and use method of an active support prefabricated secondary lining for a shield tunnel. Background technique [0002] With the continuous improvement of the level of urbanization in our country, the problem of urban ground traffic congestion is becoming more and more serious. Vigorously utilizing and developing underground space has become the best way to solve this problem. This move will definitely play a vital role in the rapid development of the city. As a result, tunnel engineering has achieved rapid development in recent years. At present, the methods of constructing tunnels mainly include open cut method, drill and blast method, shield method and immersed tube method, etc., among which shield method is a mechanized construction method for constructing tunnel structures, which has the advantages of fast construction speed and low impa...

AI Technical Summary

Problems solved by technology

Affected by external operations such as adjacent construction disturbances, ground surcharges, and excessive pumping of groundwater, excessive lateral deformation of the shield tunnel segment lining structure is often induced, which in turn leads to excessive deformation of the tunnel structure, excessive longitudinal joint opening, and joint seepage. Water leakage, crushed pieces of concrete at the corners of the segment, segment cracking, and voids between the ballast bed and the segment structure, etc., directly affect the structural safety and normal operation of the tunnel, and bring great challenges to the maintenance and repair of the tunnel.

[0004] From the above, excessive lateral deformation not only causes operational and structural safety issues, but also causes negative social feedback, and even brings huge economic losses to the country in severe cases.

So far, for the problem of excessive lateral deformation of shield tunnel segment rings, a unified and effective control method has not been formed at home and abroad.

At present, as the mainstream method for controlling the deformation of segmental linings is the sticking steel plate method, but this method is a passive control method, which only limits the further development of the deformation of the lining structure to a certain extent, and it is difficult to achieve timely and effective control of segmental deformation

Images