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The construction method used for anti-burst of ultra-deep foundation pit

A construction method and technology for deep foundation pits, which can be used in infrastructure engineering, excavation, construction, etc., and can solve problems such as hidden water inrush hidden dangers

Active Publication Date: 2021-11-19
SHANGHAI TUNNEL ENG CO LTD +1
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The purpose of the present invention is to overcome the defects of the prior art, to provide a construction method for anti-inrush of ultra-deep foundation pits, which solves the problem of hidden dangers of pressurized water inrush during excavation of ultra-deep foundation pits, and during construction The impact on the surrounding environment is small, it will not cause the settlement of surrounding buildings, and it can ensure the construction quality and construction efficiency

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  • The construction method used for anti-burst of ultra-deep foundation pit
  • The construction method used for anti-burst of ultra-deep foundation pit
  • The construction method used for anti-burst of ultra-deep foundation pit

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[0086] Taking the clearance wells on both sides of the rail transit station as an example, the foundation pit to be constructed is the clearance well. Since the surrounding buildings of the foundation pit are stations, the requirements for ground settlement are extremely high, and the settlement range should not be greater than 2mm and 5mm. , the top elevation of the confined water layer in the construction area is -23.92 ~ -26.31m, and the deepest excavation of the foundation pit is 23.6m, which is very close to the confined water layer. Only when it reaches 13.6m can the safety requirements of foundation pit excavation be met. This project needs to excavate four foundation pits;

[0087] Calculate the bottom elevation of the waterproof reinforcement layer according to ∑h·γs≥Fs·γw·H, the thickness of the water insulation reinforcement layer is 10m, and the thickness of the pressure reduction reinforcement layer is 3m. In the calculation, it is necessary to take into account th...

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Abstract

The invention relates to a construction method for anti-burst of an ultra-deep foundation pit. The bottom of the foundation pit to be excavated is close to a pressurized water layer. The construction method includes: setting an underground continuous wall around the area of ​​the foundation pit to be excavated; Use MJS to pour a waterproof reinforcement layer at the bottom of the underground diaphragm wall, and the perimeter of the waterproof reinforcement layer fits the underground diaphragm wall; use MJS at the bottom of the foundation pit to be excavated above the waterproof reinforcement layer The pressure-reducing reinforcement layer is poured, and the periphery of the pressure-reducing reinforcement layer is attached to the underground diaphragm wall; the foundation pit is excavated and the supporting structure is correspondingly supported. The invention effectively solves the problem of the hidden danger of pressurized water inrush during excavation of ultra-deep foundation pits, has little impact on the surrounding environment during construction, does not cause settlement of surrounding buildings, and can ensure construction quality and construction efficiency.

Description

technical field [0001] The invention relates to the field of building construction, in particular to a construction method for anti-surge in ultra-deep foundation pits. Background technique [0002] With the rapid development of cities, in order to meet the needs of human life, more and more urban underground space resources are being developed and utilized. In particular, the construction of underground rail transit is in full swing in major cities. However, when it is necessary to excavate ultra-deep foundations When the pit is surrounded by buildings with extremely high requirements for settlement control, it is impossible to carry out the process operations that may cause serious deformation of the surrounding environment of the foundation pit, such as confined water precipitation, high-pressure rotary jet reinforcement, etc. However, the maximum excavation depth of the foundation pit reaches the confined water layer. Below, under the premise of not adopting confined wat...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E02D17/02E02D17/04E02D19/06E02D19/10E02D19/18
CPCE02D17/02E02D17/04E02D19/06E02D19/10E02D19/18
Inventor 潘伟强曹骥王建秀龙冠宏朱雁飞裴烈烽陈思慧王彦杰诸颖魏林春李昊严振祥陈怡郭彦
Owner SHANGHAI TUNNEL ENG CO LTD
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