Plain pile reinforcement system used for reserving conditions for long-term lines passing existing lines and construction method of system

Abstract

The invention relates to a plain pile reinforcement system used for reserving conditions for long-term lines passing existing lines and a construction method of the system. Under the influence of built metro lines and surroundings, later metro line building conditions are relatively strict, and in a project of passing the existing lines, conventional stratum pre-reinforcement treatment measures cannot meet the safe operation requirements of the existing lines. The system comprises existing tunnels and long-term tunnels above or below the existing tunnels, overlapping regions of planar projections of the existing tunnels and the long-term tunnels are interchanging point ranges, and plain concrete piles are arranged at the interchanging point ranges. Sleeve valve pipe grouting reinforcement areas are arranged between the existing tunnels and the long-term tunnels. By means of the system, physical and mechanical parameter indexes of interlayered soil bodies between the existing lines and the long-term lines can be effectively improved, and the safe operation of the existing lines is ensured. The system has the advantages of being flexible to arrange, adjustable in pile diameter and reliable in stratum treatment effect, and is capable of avoiding the unpredictability of a conventional stratum advance pre-reinforcement effect.

Description

technical field [0001] The invention relates to the technical field of tunnel engineering, in particular to a plain pile reinforcement system and a construction method thereof for the condition that a long-term line crosses an existing line is reserved. Background technique [0002] For the current rail transit projects in major cities in China, with the gradual construction of the planned subway lines and the continuous densification of the long-term network, when the existing subway lines have occupied the main corridors, in the process of long-term line construction, Inevitably, there are many cases of traversing the implemented lines (existing lines). Since the implementation time of the long-term line is relatively late, in many cases, the construction of the implemented line is started when the line is opened for operation, which increases the difficulty and risk of project implementation to a certain extent, and may involve public safety, causing It has attracted ext...

AI Technical Summary

Problems solved by technology

[0003] When the long-term line crosses the existing line, it is necessary to find a way to overcome the formation loss and settlement deformation generated during the tunnel construction, but the conventional ground pre-reinforcement measures and the reduction of construction disturbance cannot fully guarantee the operation safety of the existing line, so It is necessary to reserve the forward line crossing condition during the implementation of the existing line

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