Excavation construction method of small foundation pit near excavated deep foundation pit

Abstract

The invention discloses an excavation construction method of a small foundation pit near an excavated deep foundation pit. An excavation door is formed after a temporary pile, near the small foundation pit, at the bottom of the deep foundation pit is drilled off; soil in the small foundation pit is excavated through the excavation door, so that the soil in the small foundation pit falls down to the elevation of a waist beam support of the deep foundation pit; a corresponding waist beam support is constructed in the small foundation pit; a reinforcement in the corresponding waist beam support in the small foundation pit is connected with a reserved reinforcement of the corresponding waist beam support in the deep foundation pit; and the operation is circulated until the small foundation pit and the deep foundation pit are excavated to the corresponding elevations, so that the difficulty of incapability of synchronously constructing adjacent foundation pits is solved, the construction period is shortened, the projection cost is saved, the once formation of the main structure is guaranteed, the structure stress stability is guaranteed, and the waterproof hidden trouble of the main structure is solved. The safety in the excavation period of two foundation pits is guaranteed.

Description

technical field [0001] The invention relates to a foundation pit excavation in the field of building construction research, in particular to a small foundation pit excavation construction method adjacent to an excavated deep foundation pit. Background technique [0002] Due to the impact of traffic evacuation, pipeline relocation and other factors during the construction of the subway station in recent years, during the construction of the foundation pit, there will be some parts of the foundation pit that cannot be constructed, and only temporary isolation piles can be used to divide the foundation pit into two or even multiple foundation pits for construction. , the main foundation pit has been excavated and the support construction of each layer has been completed after the traffic evacuation or the pipeline problem is solved. According to the conventional construction method, the adjacent small foundation pit can only be excavated after the excavation of the main foundat...

AI Technical Summary

Problems solved by technology

[0003] The above traditional construction methods have the following disadvantages: (1), the construction of the main foundation pit is completed and then the small foundation pit is constructed, and there will be a large delay in the construction period; (2), the project cost is relatively large, and the management cost increases; (3) the main body The structure cannot be formed at one time. After the construction of the main structure of the main foundation pit is completed, the small foundation pit structure is constructed again, which is easy to damage the waterproof layer, and the straight threaded joint of the steel bar is not well stressed.

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