Foundation pit construction method combining reverse construction method and steel support

Abstract

The invention discloses a foundation pit construction method combining a reverse construction method and a steel support. The method comprises the following steps of setting an erecting position of the horizontal steel support to be erected; constructing a vertical building enclosure structure, wherein the building enclosure structure is arranged on the periphery of a foundation pit to be dug; constructing a horizontal structure top plate which is arranged on the top of the foundation pit to be dug and is connected with the building enclosure structure; downwards digging earthwork to the erecting position; erecting the horizontal steel support in the erecting position; connecting the horizontal steel support with the building enclosure structure; continuously and downwards digging the earthwork to the bottom of the foundation pit; constructing a main body structure outer wall; binding an external wall steel bar framework of the main body structure outer wall on the horizontal steel support; forming a main body structure outer wall through concrete casting on the external wall steel bar framework; cutting a part positioned outside the external wall surface of the main body structurefrom the horizontal steel support; and performing dismounting. The support change treatment is avoided; the problems of complicated treatment operation, many potential safety hazards of the dismounting work, cleaning difficulty and high cost due to support change treatment are solved; and the advantages of operation simplicity and high safety are realized.

Description

technical field [0001] The invention relates to the field of foundation pit construction, in particular to a foundation pit construction method combining an upside-down method and steel support. Background technique [0002] In order to save the construction period, protect the environment and save resources, some foundation pits are constructed by reverse method. However, due to the large clearance of the underground structure of some projects, there is no beam slab in the middle of the structure. During the reverse construction, only the structural roof of the first floor plays a supporting role, and the outer wall and bottom slab of the main structure of the structure are not constructed. The enclosure structure cannot meet the requirements of earthwork excavation, and in severe cases, it may lead to instability of the foundation pit. [0003] The traditional method is to add concrete inner supports near the middle of the structure to meet the requirements of earthwork e...

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Problems solved by technology

[0005] In order to solve the problems of complex bracing replacement operation, many safety hazards in demolition work, difficult cleaning and high cost caused by the use of concrete supports in the construction of the upside-down method, the invention provides a foundation pit that combines the upside-down method and steel supports Construction method

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