Secondary pouring construction method for pit-in-pit foundation bottom plate in large deep foundation pit

A foundation floor and secondary pouring technology, which is applied in the direction of basic structure engineering, buildings, artificial islands, etc., can solve the problems of high risk in foundation pit construction and long construction period of deep foundation pits, and achieve the reduction of anti-floating requirements and facilitate reinforcement and stability Sexuality, the effect of reducing losses

Pending Publication Date: 2018-11-30
JIANGSU NANTONG NO 2 CONSTR ENG GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] Moreover, the construction period of the deep foundation pit is long, and the pit in the pit is the top priority in the construction of the entire deep foundation pit. The longer the exposure time of the pit bottom, the greater the construction risk to the entire foundation pit

Method used

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  • Secondary pouring construction method for pit-in-pit foundation bottom plate in large deep foundation pit
  • Secondary pouring construction method for pit-in-pit foundation bottom plate in large deep foundation pit

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Embodiment 1

[0031] A secondary pouring construction method for the bottom plate of the pit-in-pit foundation of a large-scale deep foundation pit. First, the earthwork in the pit-in-pit is excavated to the bottom elevation of the cushion layer, and then the cushion layer at the bottom of the pit is poured.

[0032] Specifically, in order to prevent the danger of piping in the foundation pit, the thickness of the cushion layer should be increased as much as possible to 300-400mm. Therefore, during the excavation of the earthwork, attention should be paid to the control of the bottom elevation of the cushion layer.

[0033] The cushion concrete adopts ≥C30 impermeable concrete, and the cushion is covered with Ф10@150 single-layer two-way steel mesh, and the scope of cushion pouring is that the bottom of the deep pit is expanded 500-800mm wide, which is convenient for the subsequent retaining wall of masonry.

[0034] After the cushion pouring is completed and cured, the engineering piles wi...

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PUM

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Abstract

The invention discloses a secondary pouring construction method for a pit-in-pit foundation bottom plate in a large deep foundation pit. According to the construction method, secondary pouring is carried out on the pit-in-pit bottom plate of the large deep foundation pit, the bottom is poured firstly, a water stopping belt is arranged at the position of a construction joint, moreover, the positionof the construction joint is reinforced before final setting, so that the overall stress of the bottom plate is not affected, the exposure time of a base of the pit-in-pit part is effectively shortened, meanwhile, the one-step pouring thickness of the bottom plate is reduced through a local advance pouring method, the anti-floating requirement of a supporting mold of an elevator shaft part is reduced, so that the reinforcing stability of the supporting mold is facilitated.

Description

technical field [0001] The invention relates to the technical field of construction, in particular to a construction method for secondary pouring of foundation bottom plates in pits in large deep foundation pits. Background technique [0002] With the continuous development of the urbanization process, the limited land use in the city center promotes the development of buildings to the sky and underground. In the process of deep foundation pit construction, the complexity, unknown, and changeable nature of the underground has become a major difficulty in construction, such as foundation pit piping. , side wall leakage, collapse and so on. [0003] Moreover, the construction period of the deep foundation pit is long, and the pit in the pit is the top priority in the construction of the entire deep foundation pit. The longer the exposure time of the pit bottom, the greater the construction risk to the entire foundation pit. [0004] Therefore, a new construction method is nee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D29/05E02D31/02E02D31/04
CPCE02D29/05E02D31/02E02D31/04E02D2250/0023
Inventor 董松张津铨孙成伟胡勇徐亮
Owner JIANGSU NANTONG NO 2 CONSTR ENG GRP
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