Airbag structure with regard to displacement deviation of operating subway tunnel and construction method

Abstract

The invention discloses an airbag structure with regard to displacement deviation of an operating subway tunnel and a construction method. The airbag structure with regard to the displacement deviation of the operating subway tunnel comprises an airbag; a central pulling rod and a telescopic skeleton which is arranged around the central pulling rod are arranged in the airbag; a conical cap tip which is fixedly connected with the central pulling rod is arranged at the top of the airbag; the bottom of the airbag is connected with a sealing plug; a hole channel for the central pulling rod, an inflating pipe and a soil feeding pipe to enter is reserved in the center of the sealing plug; air is supplied to the inflating pipe through an inflating device; and filling soil is supplied to the soilfeeding pipe through a soil feeding device. The influence on the surrounding can be minimized to the greatest extent in the mode of inflating, extruding and correcting by utilizing the airbag; great influence on the surrounding environment in conventional sleeve valve pipe grouting which may cause the hazard of unnecessary deformation close to other pipelines or structures is avoided; and the airbag structure with regard to the displacement deviation of the operating subway tunnel and the construction method are suitable for performing local tunnel displacement deviation in underground space with dense pipelines.

Description

technical field [0001] The invention belongs to the technical field of reinforcing and protecting subway tunnels in operation, and in particular relates to an inflatable bag structure and a construction method for correcting displacement of subway tunnels in operation. Background technique [0002] With the development of urban underground space, more and more pipelines and structures appear in the limited shallow ground space. Since the subway tunnel itself is relatively sensitive to the impact of displacement, the possible construction of new tunnels, excavation of foundation pits, large-scale pile foundations, and large-scale ground surcharges may cause the existing tunnels to move toward the existing subway tunnels. Local displacement and deformation in all directions affect the normal operation and structural safety of the tunnel. [0003] To deal with excessive tunnel displacement, grouting is often used in engineering to correct the deviation. The traditional grouti...

AI Technical Summary

Problems solved by technology

However, in actual engineering, the grout is prone to slipping in the soil, and it is difficult to accurately control the volume, position and direction of the injected grout, which is likely to cause secondary impacts on other surrounding structures

When there are both objects to be corrected and non-corrected objects in a small space, or the amount of corrections of multiple objects to be corrected is different, the traditional sleeve valve pipe deviation correction scheme has the disadvantages of sleeve valve pipe layout, grouting amount, and grouting pressure control. The difficulty will rise sharply, which is often difficult to achieve in reality

At the same time, the deviation correction form of sleeve valve pipe grouting is not flexible enough, and the grouting process is irreversible. If too much grout is injected, it is easy to cause excessive deviation correction, and it is necessary to perform reverse grouting in another direction, resulting in unnecessary waste and time-consuming strenuous

In addition to sleeve valve pipe grouting correction technology, another common correction measure for operational tunnels in engineering is post-wall grouting. Most of the existing post-wall grouting technologies are directly carried out through the grouting hole to the outside of the segment. High-pressure grouting uses the splitting and infiltration of grout to reinforce the surrounding soil layer. This method can correct the floating or sinking deformation of the tunnel in a short period of time. , in the later operation process, the cement blocks will accelerate the sinking with the tunnel, affecting the operation and structural safety of the tunnel

In addition, whether it is the sleeve valve technology or the grouting technology behind the wall, a large amount of grout is often injected, which will cause great pollution to the soil and groundwater sources, which is not conducive to environmental protection

[0004] To sum up, the existing grouting deflection correction technology for shield tunnels mainly has the following problems: it is difficult to accurately control the deflection correction effect, it has a great impact on other nearby non-rectification objects, the deflection correction form is inflexible, the construction scheme design is complicated, the environment is polluted, and it is easy to accelerate after construction. Problems such as subsidence need to be solved by improving technology

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