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Construction method of underground deep foundation concrete by reverse formworks

A construction method and concrete technology, which can be used in infrastructure engineering, excavation, construction, etc., can solve the problems of not being able to withstand lateral pressure, collapse, deformation, etc., and achieve the effect of reliable quality and prevention of quicksand and soil collapse.

Inactive Publication Date: 2012-12-12
MCC5 GROUP CORP SHANGHAI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the case of a narrow foundation pit that cannot support the formwork, the common method is to build a brick membrane, but it is only suitable for shallow foundations
The first reason is that the speed of bricklaying is slow, and the groundwater rushes up quickly. In the rainy season, it cannot resist the mud and sand. The second is that the brick membrane exceeds a certain height and cannot withstand the lateral pressure when pouring concrete (the concrete itself is produced by static pressure and vibration. dynamic pressure), there is a risk of deformation and collapse
[0004] Therefore use known formwork support method to exist above-mentioned inconvenience and problem in the construction under the situation of deep underground foundation and foundation pit narrow

Method used

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  • Construction method of underground deep foundation concrete by reverse formworks
  • Construction method of underground deep foundation concrete by reverse formworks
  • Construction method of underground deep foundation concrete by reverse formworks

Examples

Experimental program
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Embodiment 1

[0037] A kind of underground deep foundation concrete antiform construction method of the present invention is characterized in that comprising the following steps:

[0038] a. Construction support piles

[0039] The foundation is positioned and laid out according to the coordinate size of the drawing, and then concrete support piles are constructed near the periphery of the foundation so that the edge distance is 300-500mm. The concrete support piles are concrete pouring piles or concrete continuous retaining walls.

[0040] b. Excavation of the foundation pit support counter-model, which includes the following steps:

[0041] (1) Excavate the foundation pit when the supporting piles reach the health-preserving strength;

[0042] (2) Excavate to the level of the bottom of the foundation pit to lay a cushion;

[0043] (3) Accurately position and lay out the foundation on the cushion;

[0044] (4) Set up the anti-mold according to the setting-out support;

[0045] Among the...

Embodiment 2

[0051] figure 2 It is a schematic diagram of another supporting mode of the counter-form in the embodiment of the present invention, except that the supporting mode of the counter-form uses scaffolding steel pipes to support the formwork: the support system is set up with wooden squares, scaffolding steel pipes, fasteners, etc. on the inside of the foundation, and the rest are implemented in the same way. example 1.

[0052] The anti-formwork construction method for underground deep foundation concrete of the present invention is widely used in the No. 4 and No. 6 oriented silicon steel projects of Qiangang No. 2 Cold Rolling of Shougang. There are more than 40 underground cable tunnels in this project, and the depth of the foundation pits is -5m~-7m. Between them, there are criss-crossing, compact layout, and dense equipment foundations, resulting in a narrow foundation pit and no operating space for supporting forms; the civil construction stage is catching up with the rare...

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Abstract

A construction method of underground deep foundation concrete by reverse formworks is characterized by including the following steps of firstly, constructing supporting piles; and secondly, excavating foundation pits to set up reverse formworks; thirdly, pouring concrete of the reverse formworks; and fourthly constructing concrete foundation. The step of excavating the foundation pits to set up the foundation formworks includes the following steps of firstly, excavating the foundation pits when the supporting piles reach preservation strength; secondly, excavating to the bottom elevation of the foundation pits to make cushion; thirdly, accurately locating for foundation marking on the cushion; and fourthly, setting up reverse formworks according to the marking. The step four includes: when buried depth of the foundation is larger than -5meters, formworks and walls of the foundation pits are welded by 6- 12mm corner residual steel bars and colligated into steel bar meshes, wool forms for making the reverse formworks are more than seven layers of sandwiched plates, and formwork setting height is equal to height of foundation concrete. The construction method of the underground deep foundation concrete has the advantages that novel deep foundation is additionally built between adjacent buildings, and displacement and destroy of adjacent buildings are avoided during excavation and construction.

Description

technical field [0001] The invention belongs to the technical field of building construction, and relates to a construction method for underground deep foundation concrete, in particular to a counter-formwork construction method for underground deep foundation concrete. Background technique [0002] For the underground concrete foundation construction with a buried depth of about -5.0 meters, in order to meet the operating space requirements of the supporting formwork, the size of the foundation pit after excavation must be greater than the foundation concrete margin by more than 800 mm, but in some special cases the foundation pit is very narrow For example, the foundation pit is adjacent to other original buildings and structures. In some technical transformation projects or reconstruction and expansion projects, it is often necessary to build a new foundation in the middle of the original buildings and structures, or in the newly backfilled loose soil or sandy soil. If th...

Claims

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Application Information

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IPC IPC(8): E02D27/10E02D17/00E02D17/02
Inventor 李刚于淼周煜源苏元洪陈顺华
Owner MCC5 GROUP CORP SHANGHAI
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