Small-radius shield tunnel construction technology

Abstract

The invention introduces a shield excavation technology of a tunnel with a sharp curve on the basis of the analysis of easy occurred problems in shield construction of a metro tunnel with a sharp curve and the combination of an engineering example of a long-distance tunnel with an extremely sharp curve between districts in a Yangjiji zoo. The development of a city promotes the development of rail transit construction. Because the selection of a rail transit line is restricted by planning, buildings and structures, the shape of the rail transit line is more and more complicated. Although the line shape of the tunnel with the sharp curve is not excellent, the line shape is applied more and more frequently. Compared with the conventional shield construction technology, the shield construction technology of the tunnel with the sharp curve has certain particularity. The research on the shield construction technology of the tunnel with the sharp curve, in particular to the shield construction technology of the tunnel with the sharp curve in complex strata in Guangzhou, has a certain reference function for similar shield construction of the tunnel with the sharp curve in the future.

Description

technical field [0001] The invention relates to a shield tunnel construction technology, in particular to a small-radius shield tunnel construction technology. Background technique [0002] In the earth pressure balance shield construction at home and abroad, the 200m turn is the smallest turn in China, and a 250m turn has been done in Japan. Such a unique small-radius shield construction project is very rare. Relevant design and construction technology research or technical achievements are also very few. The smaller the radius of the curve and the longer the shield machine, the greater the amount of deviation correction, the lower the sensitivity of deviation correction, and the more difficult it is to control the axis. The above characteristics of this project make the construction very difficult, and the quality, safety and even progress of the construction are very difficult. Even if measures are taken so that the quality, safety or progress will not be greatly affect...

AI Technical Summary

Problems solved by technology

The smaller the radius of the curve and the longer the shield machine, the greater the amount of deviation correction, the lower the sensitivity of deviation correction, and the more difficult it is to control the axis. The above characteristics of this project make the construction very difficult, and the quality, safety and even progress of the construction are very difficult. It is difficult to guarantee that even if measures are taken so that the quality, safety or progress will not be greatly affected, the construction cost may be greatly increased due to the unreasonable scheme adopted

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