Construction method for treating operating metro tunnel settlement by using anchor cable method

Abstract

The invention relates to a construction method for treating operating metro tunnel settlement by using an anchor cable method, wherein a horizontal directional driller is utilized to drill along a design arc curve so as to form a pilot hole, then the guiding drill bit is replaced by a reversed broaching bit, the driller is backed and a stranded wire is pulled back at one time, a concrete pier with a reserved channel for passing through the stranded wire and a foundation pile for supporting the concrete pier are casted in the buried point and unearthed point of the stranded wire, a prestressing force is applied, and a construction of prestress anchor cable system passing through the downside of the operating metro tunnel is formed; in soft earth area, the prestress anchor cable system is arranged in every 200-600 meters along the direction of the operating metro tunnel. The technical method belongs to a trenchless construction technology, the project amount is less, the construction cost is low, and the influence on peripheral buildings and environment is less; and during the construction, not only can the normal operation of the metro tunnel be not influenced, but also the differential subsidence deformation of the metro tunnel in soft earth area caused by ground settlement can be effectively solved, the charge for long term maintenance is reduced, and the operation safety is ensured.

Description

technical field [0001] The invention relates to the technical field of tunnels and underground engineering, in particular to a construction method for treating the settlement of an operating subway tunnel by the anchor cable method. It is mainly applicable to technical fields such as long-term settlement control of subways operating in soft soil foundations due to factors such as train cycle dynamic loads. [0002] Background technique [0003] As a large number of infrastructure facilities such as subway tunnels in weak land areas of the country are put into operation, these projects, as the lifeline projects of national cities, are prone to gradually produce diseases such as differential settlement during the operation period of subway tunnels. For example, some subways in Shanghai have already experienced 30-40 cm of subsidence since their operation, which will affect the normal operation of trains in the long run. During the operation period, the differential settlemen...

AI Technical Summary

Problems solved by technology

[0007] The purpose of the present invention is to overcome above-mentioned insufficiency and defect, solve the subsidence problem of operating subway tunnel along the tunnel direction difference in soft soil area under the action of train cyclic dynamic load, propose a kind of construction method that utilizes anchor cable method to deal with the subsidence of operating subway tunnel, along the subway tunnel The anchor cable system is arranged at intervals in the direction to support the subway tunnel, so as to achieve the purpose of overall control of differential settlement and deformation of the subway tunnel in soft soil areas

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