Application of top-down construction method to structural construction of underground substation

Abstract

The invention relates to application of a top-down construction method to structural construction of an underground substation, which includes the steps: firstly, applying a combined channeling technique of lifting and milling for an underground diaphragm wall in a soft soil area; secondly, using an independently researched intelligent one-column one-pile verticality adjustment device; thirdly, applying an H-shaped steel joint to the ultra-deep underground diaphragm wall, and applying corresponding overflow and detour flow preventions to the top, the bottom and two sides of each H-shaped steel; fourthly, digging a basement to a certain depth; fifthly, mastering pumping parameters and reasonably distributing unwatering and relief wells inside and outside a pit; and sixthly, using a high-power centrifugal fan, an infrared automatic control flushing system and a construction lifter applicable to underground building top-down construction. Compared with the prior art, the application has the advantages that land resources are saved, brace blasting is reduced, formation of a deep foundation pit is controlled effectively, emission of flying dust, noise and waste is low, efficiency and accuracy are high, and the like.

Description

technical field [0001] The invention relates to the application of the upside-down technique, in particular to the application of the upside-down technique in the structural construction of an underground substation. Background technique [0002] In recent years, with the development of Shanghai, the city's highest electricity load has grown rapidly with an average annual growth rate of about 10%, and the contradiction between power supply and demand in the city has become increasingly apparent, especially in the central city of Puxi; the 2010 World Expo has been held in Shanghai The site is set on both sides of the Huangpu River in the central urban area. In addition to the new demand for power supply, higher standards have been put forward for the reliability of power supply in the central urban area; the requirements of policies such as the entry of overhead lines into the ground have also raised the new requirements. At the end of 2002, from the perspective of Shanghai ...

AI Technical Summary

Problems solved by technology

[0012] As an emerging construction technology, the upside-down method still has many shortcomings: for example, the support position of the upside-down method is limited by the height of the basement, and the height cannot be adjusted. In case of a basement with a large story height, sometimes it is necessary to set up temporary horizontal supports Or increase the section and reinforcement of the enclosure wall

Since the excavation is carried out with the top closed, and there are a certain number of intermediate support columns and well point pipes for dewatering in the foundation pit, there is still a lack of small, flexible and efficient small excavation machines, which makes excavation more difficult. Big