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Island-basin combination excavation method for consequent operation of a major-diameter round no-inner support deep foundation pit

An earthwork excavation, large-diameter technology, used in excavation, infrastructure engineering, construction, etc., can solve the problems of increasing the exposure time of the foundation pit and the deformation of the enclosure structure, and reduce the exposure time of the foundation pit and the excavation speed. The effect of speeding up, surrounding environment control

Inactive Publication Date: 2012-10-03
SHANGHAI CONSTRUCTION GROUP +1
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Problems solved by technology

Constrained by the construction and maintenance time of the circular purlin, the excavation of the entire foundation pit will be intermittently waited, the exposure time of the foundation pit will increase, and the deformation of the enclosure structure will increase

Method used

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  • Island-basin combination excavation method for consequent operation of a major-diameter round no-inner support deep foundation pit

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Embodiment Construction

[0019] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments.

[0020] In a specific embodiment, during the construction of a circular foundation pit with a diameter of 121 m in the main building of an engineering building, the earthwork excavation construction method for a large-diameter circular deep foundation pit without internal support of the present invention is used to excavate the foundation pit in 7 layers. Among them, the first, second, and seventh floors are mainly excavated by pots, and the third to sixth floors are mainly excavated by islands. Such as figure 1 as shown,

[0021] (1) Island-type excavation is adopted for the upper layer of soil, the upper ring edge soil 1 is constructed first, and the ring purlin 7 of this layer is constructed in time, and then the middle part of the upper layer of soil 2 is excavated.

[0022] (2) After all the excavation of the upper layer of soil is compl...

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Abstract

The invention discloses an island-basin combination excavation method for consequent operation of a major-diameter round no-inner support deep foundation pit. The island-basin combination excavation method comprises the following steps: firstly processing a top soil mass by island type excavation, constructing a top round soil mass, and then excavating a middle soil mass and timely constructing a round purlin of the top layer; if the round purlin of the top layer achieves the design strength, firstly excavating a lower round soil mass, timely constructing a lower round purlin and then excavating a lower middle soil mass; if the round purlin of the top layer is not formed or does not achieve the design strength, on the premise of satisfying the foundation pit deformation control requirement, firstly excavating the lower middle soil mass, and then excavating the round soil mass; and finally excavating the residual soil mass of the layer. The island-basin combination construction method is used and then the island-basin combination excavating operation way closely joined with enclosing structure construction is formed. The excavation progress of the foundation pit is quickened, the exposure time of the foundation pit is reduced and the deformation control of the enclosing structure and the ambient environment protection are facilitated.

Description

technical field [0001] The invention belongs to the technical field of building underground engineering, and relates to an earthwork excavation method for a foundation pit, in particular to an earthwork excavation method for a large-diameter circular deep foundation pit island-basin without internal support combined with earthwork excavation. Background technique [0002] In the large-diameter circular foundation pits constructed by the straight method, since there are few examples of its application in engineering, the excavation of such foundation pits generally follows the construction method of island excavation, that is, the surrounding soil is excavated first, The ring-shaped purlin is formed, and the soil in the lower layer of the foundation pit can only be excavated after the ring-shaped purlin reaches a certain strength. Constrained by the construction and maintenance time of the circular purlin, the excavation of the entire foundation pit will be intermittently wai...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02
Inventor 龚剑朱毅敏周虹耿涛薛永申孙晓鸣张常庆陈康
Owner SHANGHAI CONSTRUCTION GROUP
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