Tray type excarvating contrary construction method

Abstract

This invention provides a basin excavation inverse method. Its major construction step is the open excavation in retaining structure edge at the first step , and digs a kind of pot-style structure, and pour the top layer concrete of underground structure, and provides dug holes; then excavates in another way, it is a pot of architecture, and pours the top structure concrete of the underground two-story, and allows dug holes; following mining, and pouring the top three underground structure plate and the top four floors underground structure ; the bottom of base plate structure is divided into two parts ;it excavates scope of the bottom floor firstly, the pit digs to the bottom, pouring concrete, then the envelope around 6 ~ 10 meters pumps the excavation. This construction method is suitable for the large pit area, depth deeper large-scale construction projects, as it constructs conveniently, saves manpower and resources to improve the progress of the project, and shortens the construction periods.

Description

technical field [0001] The invention relates to an underground structure basin type excavation reverse method construction method in the civil engineering industry. Background technique [0002] The reverse method that emerged in the 1980s is to excavate a section of earthwork downward after the surrounding enclosure, that is, the underground diaphragm wall, and then use the false corbel method to pour the concrete structure of this section, and then proceed downwards sequentially. Construction method up to the bottom. In the top-down construction process, due to the gentle soil surface, the elevation of the soil surface under the structure is generally consistent with the bottom surface of the structural beams and slabs, that is, the construction of each layer of the structure using the soil membrane method does not require the support of bent frames. [0003] This traditional construction method is generally used in housing construction. The basement floor height is gener...

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Problems solved by technology

[0003] This traditional construction method is generally used in housing construction. The basement floor height is generally not high, and the foundation pit area is small, generally 6000m 2 Left and right, when carrying out construction, the construction openings must first be arranged according to the structural layout characteristics of the first floor of the building. Generally, the openings are small and the number is small, which leads to a large distance between the openings, about 60~ 70m, so during the construction process, the excavation of underground earthwork is relatively large, and the amount of secondary lightering is also large, and the progress of the project is slow

Moreover, this kind of excavation structure is not conducive to natural ventilation. In general, it is necessary to use multiple exhaust fans and set up a special ventilation system, which further reduces the limited construction area, which not only wastes the cost, but also affects the entire construction process. bring great inconvenience

[0004] Therefore, for projects with large foundation pits, deep depths, high requirements for deformation control and structural quality, large layer height changes, fast excavation speed requirements, and tight construction schedules, the traditional reverse construction method cannot be applied.

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