Method for treatment of differential settlement of foundations of all sections of railway tunnel

Abstract

The invention relates to a method for treatment of differential settlement of foundations of all sections of a railway tunnel. When serious differential settlement happens to a multi-section structure of the railway tunnel and normal use is influenced, the railway tunnel needs to be dismantled and rebuilt, construction is complex, and the construction period is long. According to the method for treatment of the differential settlement of the foundations of all the sections of the railway tunnel, pile foundations with pile tops lower than a tunnel body are arranged on the four corners of a base plate of a railway tunnel body section to which settlement happens and on the outer side of a lateral wall; brackets are arranged at the positions, corresponding to the pile foundations, of the bottom portion of the lateral wall; jacks are arranged on the pile tops with the pile foundations used as supporting points, the tunnel body section is jacked up by means of the brackets to a design elevation, a gap is formed between the tunnel body section and a tunnel foundation after the tunnel body section is jacked up, and the gap is filled with concrete; the jacks are replaced with concrete blocks, and concrete is poured to enable the pile foundations to be integrally connected with the brackets; water repellent treatment is carried out on a settlement joint. Compared with the method achieved by dismantling and rebuilding, the method for treatment of the differential settlement of the foundations of all the sections of the railway tunnel has the advantages that negative influences caused by dismantling and rebuilding when the serious settlement happens to the tunnel can be reduced, all the sections of the tunnel can be recovered to the design elevations according to design requirements, and the problem of the differential settlement is solved thoroughly.

Description

technical field [0001] The invention relates to a method for maintaining the foundation of a railway tunnel, in particular to a method for regulating the uneven settlement of the foundation of each section of the railway tunnel. Background technique [0002] Railway tunnels are mostly designed as closed box structures. In order to eliminate the adverse effects of uneven foundation settlement on the tunnels, the tunnels are divided into multiple segments longitudinally. [0003] When uneven settlement occurs in each section under the tunnel, the general treatment method is: when the uneven settlement value is not large, use the method of laying a certain thickness of leveling layer above the top of the inner floor of the tunnel to restore the sections of the tunnel to the original design elevation . This treatment method has the characteristics of simple construction and low cost; the disadvantage is that it reduces the clearance in the tunnel and increases the self-weight ...

AI Technical Summary

Problems solved by technology

This treatment method has the characteristics of simple construction and low cost; the disadvantage is that it reduces the clearance in the tunnel and increases the self-weight load in the tunnel

[0004] When the uneven settlement value of the tunnel is large, the above method will inevitably greatly reduce the clearance in the tunnel and increase the self-weight load in the tunnel

When the clearance is insufficient or the bearing capacity of the foundation under the tunnel is insufficient, in order to make the tunnel reach the design function, it must be demolished and rebuilt; but the result of this will lead to a substantial increase in construction costs and delay in completion time

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