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Construction method for deep-foundation pit excavation

A construction method and technology for deep foundation pits, which are applied in excavation, infrastructure engineering, construction, etc., can solve the problems of frequent safety accidents, complicated foundation pit fabrication process, inconvenient digging of deep foundation pits, etc., so as to achieve safe and reliable excavation projects. , Reasonable design of construction steps and the effect of reducing construction costs

Active Publication Date: 2012-07-04
MCC5 GROUP CORP SHANGHAI
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  • Description
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Problems solved by technology

[0002] In recent years, the building density in cities has been increasing with the advancement of modernization. Due to expensive land and commercial interests, or to meet the requirements of urban management and civil defense, the use of underground space as much as possible has become the focus of investors. Investment Businesses not only pay attention to the height above the ground, but also pay more attention to the use of underground space. The excavation depth of underground space is getting deeper and deeper, and the excavation environment is becoming more and more complex. There are many unscientific and unreasonable aspects of pit excavation. For example, there are several supports in the foundation pit, and the fabrication process of the foundation pit is complicated and expensive.
[0003] Therefore there is above-mentioned inconvenience and problem in the construction method of known deep foundation pit excavation

Method used

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  • Construction method for deep-foundation pit excavation
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  • Construction method for deep-foundation pit excavation

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Embodiment 1

[0035] see now figure 1 and figure 2 , figure 1 It is a schematic diagram of the plane layout of the foundation pit enclosure structure according to the embodiment of the present invention, figure 2 It is a schematic cross-sectional view of the foundation pit enclosure structure according to the embodiment of the present invention. As shown in the figure, the excavation structure of the foundation pit is based on the known technology of pouring piles 12, deep mixing piles 13, ring beams 7 and compaction grouting 3 After the construction is completed, the excavation form of the foundation pit is generally "island type grading". "Excavation, excavating from the enclosure to the middle at a constant speed, using excavator 20 to excavate and earth truck 21 to transport the earth, it is characterized in that it includes the following steps:

[0036] a. The first earthwork excavation shall be divided into three areas 27, 28, 29, starting from each corner of the foundation pit a...

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Abstract

The invention relates to a construction method for deep-foundation pit excavation. After foundation pit fender structure construction is finished, an excavation machine is used for excavating and an earthwork vehicle is used for transporting out the earthwork. The construction method is characterized by comprising the following steps of: a. earthwork excavation for the first time: uniformly excavating from every corner of the foundation pit to the center by dividing three regions in a retreating manner; b. fender supporting structure construction and maintenance: pouring the fender supporting structure, and carrying out next-step construction when the supporting concrete strength achieves 80% of the design strength; and c. earthwork excavation for the second time: carrying out earthwork excavation below the fender supporting structure, selecting excavation equipment, excavating, and transporting out the earthwork in the pit in a two-stage overturning and transferring manner to finish excavation. The construction method for deep-foundation pit excavation has the advantages of being reasonable in construction step design, simple to operate and safe and reliable in excavating engineering, lowering engineering construction cost, saving construction period, and being obvious in economic benefit.

Description

technical field [0001] The invention relates to a construction method for underground deep foundation pits in construction engineering, in particular to a construction method for excavating soil from deep foundation pits. Background technique [0002] In recent years, the building density in cities has been increasing with the advancement of modernization. Due to expensive land and commercial interests, or to meet the requirements of urban management and civil defense, the use of underground space as much as possible has become the focus of investors. Investment Businesses not only pay attention to the height above the ground, but also pay more attention to the use of underground space. The excavation depth of underground space is getting deeper and deeper, and the excavation environment is becoming more and more complex. There are many unscientific and unreasonable aspects of pit excavation. For example, several supports are provided in the foundation pit, and the manufactu...

Claims

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Application Information

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IPC IPC(8): E02D17/02
Inventor 尚宁洲
Owner MCC5 GROUP CORP SHANGHAI
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