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Construction method for ultra-deep foundation pit non-drainage earth excavation

A technology of earthwork excavation and construction method, which is applied in the direction of infrastructure engineering, excavation, construction, etc., can solve the problems of waste of groundwater resources, inrush of confined water, etc., and achieve the effects of saving construction costs, reducing landslides, and reducing the degree of impact

Active Publication Date: 2020-01-17
SHANGHAI MECHANIZED CONSTR GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Using the above scheme, vacuum dewatering is carried out in the foundation pit, and the foundation pit is excavated. This construction technology is a routine operation, and it is difficult to solve the problem of dangerous situations such as pressurized water surges and ultra-deep foundation pits in the construction of ultra-deep foundation pits. Precipitation measures will have a greater impact on the surrounding environment of the foundation pit, and the daily precipitation of ultra-deep precipitation is much greater than that of shallow precipitation, which will cause irreversible waste of groundwater resources. There are still some problems that need to be improved.

Method used

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  • Construction method for ultra-deep foundation pit non-drainage earth excavation
  • Construction method for ultra-deep foundation pit non-drainage earth excavation
  • Construction method for ultra-deep foundation pit non-drainage earth excavation

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Embodiment 1

[0039] See attached figure 1 , a construction method for undrained earthwork excavation of an ultra-deep foundation pit, comprising the following steps,

[0040] The construction site is pre-arranged, the construction site is cleaned up, and infrastructure such as mud mixing tank 5 and sedimentation tank 6 are set up around the side of the foundation pit to be excavated.

[0041] S1, enclosure construction, enclosure construction is carried out on the 1st surrounding side of the foundation pit to be excavated;

[0042] S1.1, (see figure 2 with image 3) Set up several first pipe piles 2 on the ground around the foundation pit 1 to be excavated, and the insertion depth of the first pipe pile 2 enclosure is 1.2-1.5 times, preferably 1.5 times, the excavation depth; any adjacent The two pipe piles are placed close to each other, and the first pipe piles 2 are evenly inserted and set on the ground around the foundation pit 1 to be excavated to form a first surrounding pile fen...

Embodiment 2

[0054] A construction method for undrained earthwork excavation of an ultra-deep foundation pit, which differs from Implementation 1 in that:

[0055] S1, enclosure construction, enclosure construction is carried out on the 1st surrounding side of the foundation pit to be excavated;

[0056] S1.1. The type of enclosure can be any one of underground diaphragm wall, bored pile row, steel pipe pile row, SMW pile row, precast concrete sheet pile retaining wall, steel sheet pile, etc.

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Abstract

The invention discloses a construction method for ultra-deep foundation pit non-drainage earth excavation, and relates to the technical field of foundation pit construction. The construction method comprises the following steps that S1, enclosure construction is carried out, specifically, enclosure construction is carried out on the peripheral side of a to-be-excavated foundation pit; S2, shallowlayer excavation is carried out, specifically, excavation is carried out on shallow soil of the foundation pit; S3, slurry pouring is carried out, specifically, slurry is poured into the excavated foundation pit; and S4, deep layer excavation is carried out, specifically, underwater excavation operation is carried out on the deep soil of the foundation pit by means of equipment. The construction method has the advantages that the occurrence of dangerous cases such as sudden gushing of confined water is reduced, the influence degree of precipitation measures on the surrounding environment of the foundation pit is reduced, and the waste of groundwater resources is reduced.

Description

technical field [0001] The invention relates to the technical field of foundation pit construction, in particular to a construction method for undrained earthwork excavation of an ultra-deep foundation pit. Background technique [0002] The foundation pit refers to the space below the ground excavated for the construction of the foundation and basement of buildings (including structures). conduct. [0003] At present, with the increase of high-rise buildings and the increase of building requirements, foundation pit engineering is getting deeper and deeper. However, in the construction of ultra-deep foundation pits, dangerous situations such as confined water surges are extremely prone to occur; and ultra-deep precipitation measures will have a greater impact on the surrounding environment of foundation pits; on the other hand, due to the daily precipitation of ultra-deep precipitation The amount is much greater than that of shallow precipitation, which will cause irreversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D17/04
CPCE02D17/02E02D17/04
Inventor 陈晓明尹骥吴欣之林济夏凉风卫佳琦李想
Owner SHANGHAI MECHANIZED CONSTR GRP
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