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Support free construction method for super large diameter circular deep foundation ditch

A technology with super-large diameter and construction method, which is applied in infrastructure engineering, excavation, construction, etc., can solve the problems of inconvenient construction, high project cost, waste of resources, etc., and achieve convenient excavation of soil, fast project progress, and low cost Effect

Active Publication Date: 2008-01-09
ZHONGCHUAN NO 9 DESIGN & RES INST
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Problems solved by technology

[0002] At present, the excavation of foundation pits mostly adopts the combination of supported excavation and enclosure structure. The support adopts steel support or concrete support. The enclosure structure includes drilling piles and concrete mixing pile reinforcement methods. High, if it is a concrete support, the concrete support must be removed after the excavation is completed, resulting in a waste of resources
This kind of excavation method with supporting enclosure structure is very inconvenient, and trestle bridges are required for excavation when necessary

Method used

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  • Support free construction method for super large diameter circular deep foundation ditch

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Embodiment

[0029] Taking the foundation pit in the tower area of ​​Shanghai World Financial Center as an example, the excavation diameter of the foundation pit is within 100m, and the depth of the pit is about -13m. The specific steps of the construction method are as follows:

[0030] (1), build the underground diaphragm wall

[0031] ①. The thickness of the underground diaphragm wall is 1.0m, and the height of the underground diaphragm wall is 34.2m. Each segment of 2.0m is a broken line segment, and three broken line segments form a groove segment. According to the circumference of the foundation pit, determine the number of groove segments of the underground diaphragm wall for 52.

[0032] ②. Excavate the trough section with a trough forming machine until the wall bottom elevation is -30.0m (the ground elevation is +4.2m). During the excavation process, the grab should enter and exit the groove slowly and steadily, and the deviation should be corrected in time according to the inst...

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Abstract

The invention discloses a method for processing super-large-diameter round hole without supports, which comprises following steps: building underground continuous wall; setting filling posts and supports; setting strengthen element; excavating and setting purlin. Compared to traditional method, the invention has strong stability, less excavating deformation, less rebound of hole-bottom, and less effect on around environment. The invention has no inner support structure; therefore, it has less cost with simple operation, quick time and high working efficiency.

Description

technical field [0001] The invention relates to a construction method for building foundation excavation, in particular to an unsupported construction method for a super large-diameter circular deep foundation pit. Background technique [0002] At present, the excavation of foundation pits mostly adopts the combination of supported excavation and enclosure structure. The support adopts steel support or concrete support. The enclosure structure includes drilling piles and concrete mixing pile reinforcement methods. High, if it is a concrete support, the concrete support must be removed after the excavation is completed, resulting in a waste of resources. The construction of this excavation method with supporting enclosure structure is very inconvenient, and a trestle bridge is required for excavation if necessary. Contents of the invention [0003] The object of the present invention is to provide an unsupported construction method for a super large diameter circular deep ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/04
Inventor 顾倩燕姚根洪汪贵平朱宪辉费永成田振黄海云
Owner ZHONGCHUAN NO 9 DESIGN & RES INST
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