Earth excavation method under annular support of deep foundation pit

Abstract

The invention discloses an earth excavation method under annular support of a deep foundation pit. The foundation pit is excavated layer by layer in the method; and the excavation in each layer comprises the following steps: 1) part earth on the present layer is excavated; and after the excavation is finished, an annular inner support of the present layer is constructed in the excavated area; 2) center island earth of the present layer is excavated; earth or pond residues are used for forming a projected driving channel in the center island earth excavation process; and the driving channel is connected to the edge of the foundation pit or a trestle; and 3) earth serving as the driving channel is excavated. The method solves the problem of more earth transfer at the middle part of the annular support foundation pit by using a form of arranging the trestle in the center of the foundation pit, and shortens the earth construction period. The excavation technology enables an earth car to directly reach the internal of the foundation pit to excavate any area in excavation of each layer of earth through use of the inclined trestle and backfill of a pond residue road, reduces the muck reshipment times, and largely fastens the excavation speed.

Description

technical field [0001] The invention relates to a building construction structure, in particular to an earth excavation method under the circular support of a deep foundation pit. Background technique [0002] In my country's urban land planning, approximately square plots account for the majority, and in the current construction projects in soft soil areas in eastern my country, the enclosure support design of deep foundation pits gradually adopts the ring-supported foundation pit internal support system. The ring has a better stress state. Compared with the traditional symmetrical support, the cost of the ring support is lower under the same support effect. Therefore, this form of support is bound to become more popular in the central area of ​​the city. Under the ring support system, the earthwork of the foundation pit must be excavated in layers according to the principle of time and space effects, first braced and then excavated. [0003] At present, the earthwork excav...

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Problems solved by technology

Therefore, this construction method is only suitable for annular support projects with shallow foundation pits. When the foundation pit depth increases and the soil quality of the site is poor, the construction time of this method will increase and additional soil slope reinforcement costs will be generated. It cannot solve the material turnover and transportation problems in the subsequent basement structure construction and support removal operations

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