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Structure and method for treating freezing and pulling diseases in operation period of pile column

A technology of disease control and operation period, which is applied in the direction of foundation structure engineering, sheet pile walls, buildings, etc., can solve the problems such as few reports on the treatment measures of freezing and pulling diseases, and achieve the control of the development of freezing and pulling of pile foundations, simple structure and long service life long effect

Pending Publication Date: 2022-07-05
NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above measures need to be implemented in the design and construction phase of pile foundation engineering, but there are few reports on the treatment measures for freezing and pulling out of pile foundation during the operation period

Method used

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  • Structure and method for treating freezing and pulling diseases in operation period of pile column
  • Structure and method for treating freezing and pulling diseases in operation period of pile column

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] A structure for rectifying diseases caused by freezing and pulling during the operation period of a pile, wherein:

[0029] The pile includes a pile foundation 1 buried under the natural ground surface and a column body 4 fixed on the pile foundation 1, and the top of the pile foundation 1 is higher than the natural ground surface.

[0030] The freeze-pulling disease control structure includes an isolation layer 5, a sand-gravel filling area 2 and a thermal insulation board 3, wherein the structure can reduce the freezing depth and control the vertical distribution of the frozen layer around the pile, so that the tangential The frost heave force is mainly provided by the frictional resistance (or freezing strength) between the gravel packing area 2 and the cylinder 4, the isolation layer 5 is wrapped on the cylinder 4, and the gravel packing area 2 surrounds the The pile is packed, the bottom of the gravel packing area 2 is packed around the upper part of the pile found...

Embodiment 2

[0032] This embodiment further describes the thermal insulation and isolation structure in Embodiment 1.

[0033] The material of the thermal insulation board 3 is EPS. The isolation layer 5 is sequentially composed of a gauze layer, a lubricant layer and a plastic cloth layer from the inside to the outside. The gauze layer is wrapped outside the cylinder 4. After applying lubricant on the outside of the gauze layer, the gauze layer is applied. It is wrapped with a plastic cloth layer to form a "one oil and two cloth" isolation layer. Under the action of the lubricant, the freezing strength and tangential frost heave force of soil frost heave on piles (columns) are effectively weakened. Among them, the suction effect of gauze increases the lubricant storage space, and wrapping the plastic cloth can better inhibit the dissipation of the lubricant. Preferably, the material of the lubricant layer is residual oil, which has good lubricating effect and is suitable for correspondi...

Embodiment 3

[0035] A method for rectifying freezing-pulling diseases during the operation period of a pile foundation, wrapping an isolation layer 5 at the bottom of a column body 4, and the isolation layer 5 is sequentially composed of a gauze layer, a lubricant layer and a plastic cloth layer from the inside to the outside. Peat soil is excavated around the pile foundation 1, and a gravel filling area 2 is constructed to improve the frost heave property of the seasonal frozen layer around the pile and reduce the frost heave rate of the soil surrounding the pile; at the same time, a thermal insulation board 3 is installed on the surface of the gravel filling area 2. , preventing the loss of heat in the sand and gravel filling area 2 in winter, and then reducing the thickness of the seasonally frozen soil layer 6 around the pile. The combined effect of the two can control the maximum freezing depth around the pile in the sand and gravel filling area 2; Area 2 is obviously higher than the s...

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Abstract

The invention discloses a structure and method for renovating frozen heaving diseases in the operation period of a pile column, the renovating structure comprises an isolation layer, a gravel pressure filling area and a heat preservation and insulation board, the isolation layer wraps a column body, the gravel pressure filling area is filled around the pile column in a pressure mode, and the heat preservation and insulation board is arranged in the gravel pressure filling area. The gravel pressure filling area and the column body are isolated through the isolation layer, the bottom of the gravel pressure filling area is embedded into the lower layer of the earth surface, the height of the gravel pressure filling area is close to the maximum freezing depth, and the outer surface of the gravel pressure filling area is covered with a heat preservation and insulation plate. The renovation structure can achieve the effects of insulating heat, weakening the frost heaving characteristic of a soil body, reducing the normal frost heaving force of a seasonal frozen soil layer on the pile foundation, reducing the supply intensity of underground water on the frozen soil layer around the pile, and effectively controlling the frost heaving development of the pile foundation in the cold region.

Description

technical field [0001] The invention relates to the technical field of freeze-pulling prevention and control, in particular to a rectification structure and a rectification method for freezing-pulling diseases during the operation period of a pile. Background technique [0002] my country's permafrost area accounts for about 75% of the country's land area. There are rich mineral resources in permafrost areas, but most of them belong to economically underdeveloped areas. And so on construction projects more and more activities. Pile genes have little disturbance to the ground temperature field in permafrost areas, and can effectively reduce the impact of seasonal frost heave and thawing deformation of foundations. In the context of the continuous development of the road, the pile foundation will be more and more widely used. [0003] Under the repeated freezing and thawing of the seasonal frozen soil layer, the long-term stability of the shallow pile foundation is facing a h...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D31/14E02D27/35E02D5/60
CPCE02D31/14E02D27/35E02D5/60
Inventor 商允虎牛富俊高泽永李国玉王进昌
Owner NORTHWEST INST OF ECO-ENVIRONMENT & RESOURCES CAS
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