Overwintering protection structure for foundation pit bottom in seasonal frozen soil area and construction method

A technology of protective structure and construction method, applied in basic structure engineering, soil protection, excavation, etc., can solve the problem of difficult frost heave risk, reduce frost heave risk, improve air temperature, and ensure the effect of winter protection effect

Active Publication Date: 2021-11-09
CONSTR & INSTALLATION ENG THE THIRD ENG GROUP OF CHINA RAILWAY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once frost heave damage occurs in the weak winter protection area of ​​foundation pit engineering, it is difficult to directly eliminate the risk of frost heave

Method used

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  • Overwintering protection structure for foundation pit bottom in seasonal frozen soil area and construction method
  • Overwintering protection structure for foundation pit bottom in seasonal frozen soil area and construction method

Examples

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Comparison scheme
Effect test

Embodiment 1

[0037] The overwintering protection structure at the bottom of the foundation pit in the seasonally frozen soil area includes a protective layer 1 , a heating drainage tank 2 , an overhead overwintering protection bag 3 and a thermal insulation and antifreeze layer 4 .

[0038] The protective layer 1 is a covering layer with functions of heat preservation, waterproofing and fire prevention, and is laid on the bottom 6 of the foundation pit in the seasonal frozen soil area as the main body of overwintering protection. The protective layer 1 is waterproof cloth and fireproof cloth from bottom to top; the fireproof cloth and waterproof cloth are selected to have the same width and are laid along one direction. Less than 300mm; the joints of fireproof cloth and waterproof cloth are sealed and connected to prevent rain or snow from infiltrating; the joints of fireproof cloth are covered with square logs or soil bags. The protective layer 1 is provided with waterproof vent holes, wh...

Embodiment 2

[0044] The construction method of the overwintering protection structure at the bottom of the foundation pit in the seasonally frozen soil area comprises the following steps:

[0045] 1) For foundation pits that cannot be continued due to winter in seasonally frozen soil areas, the bottom of the foundation pit should be covered with thermal insulation and antifreeze construction. After the soil layer is reserved above the design level of the bottom of the foundation pit, clean up the construction waste and accumulated water at the bottom 6 of the foundation pit to ensure that it is clean, free of foreign matter, and free of accumulated water.

[0046] 2) In the bottom of the foundation pit where water is easy to accumulate 5 (such as sump pits, independent foundation overexcavation areas, etc.), the thermal insulation and antifreeze layer 4, the uninflated overhead winter protection bag 3 are laid in sequence; the air intake valve 3-2 is connected with the heating The air pump...

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Abstract

The invention relates to an overwintering protection structure for a foundation pit bottom in a seasonal frozen soil area. The overwintering protection structure comprises a protection layer, a heating drainage groove, an overhead overwintering protection bag and a heat preservation anti-freezing layer; the protection layer is a covering layer with heat preservation, waterproof and fireproof functions and is laid at the foundation pit bottom in the seasonal frozen soil area; the heating drainage groove is in continuous waterproof lap joint with the peripheral side of the protection layer, and the heating drainage groove is connected with a drainage system; a heating module is arranged at the bottom in the heating drainage groove; the heating drainage groove and the heating module are both subjected to insulation and waterproof treatment; and the heating module adopts electric heating. The structure has the beneficial effects that an active overwintering protection system is formed through cooperative operation of the heating drainage groove and the overhead overwintering protection bag, and frost heaving damage disasters of a foundation pit bottom soil body and a foundation mat in the seasonal frozen soil area can be effectively prevented and treated in time.

Description

technical field [0001] The invention relates to the technical field of foundation pit engineering, in particular to an overwintering protection structure and construction method at the bottom of a foundation pit in a seasonal frozen soil area. Background technique [0002] In the continental monsoon region of the northern temperate zone in China, the temperature is low in winter, which causes the soil to freeze and melt in the spring of the following year. The range of permafrost is generally located tens of centimeters to several meters below the ground, thus forming seasonal frozen soil. [0003] Moisture in the seasonally frozen soil forms ice crystals under negative temperature conditions in winter, causing the volume of the soil to expand, which in turn causes frost heave damage to the foundation floor and endangers the safety of the infrastructure. Conventional winter maintenance measures for foundation pit engineering in seasonally frozen regions are generally to cove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D17/02E02D3/00E02D3/11E02D19/00E02D19/06E02D31/00
CPCE02D17/02E02D3/00E02D3/11E02D19/00E02D19/06E02D31/00
Inventor 王晓峰尹华松武微张之纯张泽黄强张志昊姚志鹏尉正明程秀茹张亚娟李林谢壮
Owner CONSTR & INSTALLATION ENG THE THIRD ENG GROUP OF CHINA RAILWAY
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