A construction method for underground wells without internal support rails

Abstract

The invention provides a construction method of a metro internal-bracing-free track panel shaft. The construction method includes following steps: (1), constructing a diaphragm wall; (2), constructing a foundation pit, and sequentially constructing a top beam and an internal bracing along with excavating; (3), constructing a baseplate, and demounting the internal bracing positioned downmost the foundation pit after strength of the baseplate reaches a certain degree; (4), constructing a side wall of a negative first floor, synchronously constructing a vertical coupled shear wall, a waist beam and a side wall within a range of a negative second floor; (5), constructing a middle plate, reserving a hole for the track panel shaft on the middle plate, and synchronously constructing a vertical coupled shear wall, a waist beam and a side wall within a range of the negative first floor; (7), constructing a top plate, reserving a hole for the track panel shaft on the top plate, and after strength of the top plate reaches a certain degree, demounting the internal bracing uppermost the foundation pit. The construction method has good water stopping effect, so that water leakage is avoided and big influence on surrounding environment during construction is avoided.

Description

technical field [0001] The invention relates to a construction method for a subway without internal support rail well, and belongs to the technical field of rail transit engineering construction. Background technique [0002] With the acceleration of urbanization, the urban population, regional planning and urban ecological environment are facing enormous pressure. The development and utilization of urban underground space has become a hot spot of concern for many people. Rapid public transport system is an important way to solve urban congestion. Practice has proved that subways play an irreplaceable role in the transportation systems of large cities in most economically developed regions in the world, such as Tokyo, Moscow, and London, due to their fast, clean, and efficient features. In recent years, my country's subway construction has also developed rapidly. As of the end of 2015, a total of 36 cities in my country have been approved to build urban rail transit lines,...

AI Technical Summary

Problems solved by technology

However, during the construction of the anchor cable, the water-stop curtain of the three-axis mixing pile is pierced, which has a great impact on the water-stop effect

The applicable conditions of the anchor cable scheme are limited. For soft soil or poor ground, due to the limitation of anchoring force, the anchorage length can meet the design requirements. The construction risk is greater, and the impact on the surrounding environment is greater after completion. Some cities in China even banning the use of cable anchors in city limits

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