CN210315513U

CN210315513U - Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe

Info

Publication number: CN210315513U
Application number: CN201920669147.8U
Authority: CN
Inventors: 芮鹏飞; 王英梅; 侯鑫; 武贵龙; 刘国军; 陈继
Original assignee: Lanzhou University of Technology; Cold and Arid Regions Environmental and Engineering Research Institute of CAS
Current assignee: Lanzhou University of Technology; Northwest Institute of Eco Environment and Resources of CAS
Priority date: 2019-05-10
Filing date: 2019-05-10
Publication date: 2020-04-14
Anticipated expiration: 2029-05-10

Abstract

The utility model relates to a structure that cast-in-place bored concrete pile in perennial frozen soil area combines the heat pipe to give the frozen soil cooling, this structure is including arranging the intraformational cast-in-place bored concrete pile in perennial frozen soil and establishing the heat pipe of working medium in. The lower evaporation section of the heat pipe is buried in the cast-in-place pile, and the upper condensation section is arranged between the ground surface and the building; the upper part of the heat pipe is provided with a radiator. The utility model discloses simple structure, easy to carry out can show the temperature that reduces the many years frozen soil layer that pile foundation and pile foundation were located with the help of the operating characteristic of heat pipe to prevent that the pile foundation from subsiding.

Description

Structure for cooling frozen soil by combining cast-in-place bored concrete pile in perennial frozen soil area with heat pipe

Technical Field

The utility model relates to a permafrost region engineering field especially relates to a structure that permafrost region cast-in-place bored concrete pile combines heat pipe for the frozen soil cooling.

Background

In permafrost regions, cast-in-place piles are the most common building foundation scheme in the permafrost regions, but pile foundation settlement often happens due to the fact that frozen soil is heated or melted, the volume of ice in the frozen soil is reduced after the ice in the frozen soil is melted, the frozen soil sinks, and the original bearing capacity is lost after the frozen soil is melted, so that the pile foundation settles, and finally, a building foundation or other engineering foundations are formed to be unevenly deformed, and further, the construction foundation and the like are damaged and cannot be used.

SUMMERY OF THE UTILITY MODEL

The utility model aims to solve the technical problem that a solve often take place in permafrost region because of the frozen soil melts the structure that produces the permafrost region cast-in-place bored concrete pile of pile foundation settlement problem combines the heat pipe for the frozen soil cooling.

In order to solve the problem, a cast-in-place bored concrete pile in permafrost region combine heat pipe for the structure of frozen soil cooling, its characterized in that: the structure comprises a cast-in-situ cast-in-place pile and a heat pipe, wherein the cast-in-situ cast-in-place pile is arranged in a permafrost layer, and the heat pipe is internally provided with a working medium; the lower evaporation section of the heat pipe is buried in the cast-in-place pile, and the upper condensation section is arranged between the ground surface and the building; the upper part of the heat pipe is provided with a radiator.

Compared with the prior art, the utility model has the following advantage:

1. the utility model discloses the lower part evaporation zone of heat pipe buries in cast-in-place bored concrete pile, and the upper portion condensation segment is established between earth's surface and building, and the upper portion of heat pipe is equipped with the radiator, and when the heat pipe during operation, the working medium cools down the liquefaction after the condensation segment releases the heat to external cold air, and the low temperature working medium after the liquefaction flows down to the evaporation zone and absorbs the heat of pile foundation and peripheral frozen soil layer, then heats up the gasification and evaporates to the heat pipe condensation segment. This process takes place repeatedly in the heat pipe until the evaporation section temperature approaches or exceeds the condensation section temperature. The temperature of the pile foundation and the permafrost layer where the pile foundation is located can be obviously reduced by means of the working characteristics of the heat pipe, so that the pile foundation is prevented from settling.

2. The utility model discloses simple structure, easy to carry out.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 is a schematic structural diagram of the present invention.

Fig. 2 is a working schematic diagram of the medium heat pipe of the present invention.

In the figure: 1-permafrost layer; 2-cast-in-place bored concrete pile; 3, the earth surface; 4-a building; 5, a heat pipe; 6, a radiator; 7-working medium.

Detailed Description

As shown in figures 1-2, the structure for cooling frozen soil by combining cast-in-place bored concrete piles in a perennial frozen soil area with heat pipes comprises a cast-in-place bored concrete pile 2 arranged in a perennial frozen soil layer 1 and a heat pipe 5 internally provided with a working medium 7. The lower evaporation section of the heat pipe 5 is buried in the cast-in-place bored concrete pile 2, and the upper condensation section is arranged between the ground surface 3 and the building 4; the upper part of the heat pipe 5 is provided with a radiator 6.

The heat pipe is a device for realizing one-way heat conduction by utilizing the principle that working media absorbs heat through evaporation and releases heat through liquefaction, and is widely applied to roadbeds in permafrost regions. In the pile foundation construction stage, after the drilling is finished, one or more heat pipes 5 are tied to a reinforcement cage and placed in the drilling hole for concrete pouring, so that the construction of the cast-in-place pile 2 is finished, the lower evaporation section of each heat pipe 5 is buried in the cast-in-place pile 2, the upper condensation section of each heat pipe 5 is located between the ground surface 3 and a building 4, the upper parts of the heat pipes 5 are provided with radiators 6, and working media 7 are poured into the heat pipes 5. The upper condensation section is exposed in the air, the radiator 6 is added to the condensation section exposed in the air, the heat dissipation efficiency is improved, and the number and the length of the heat pipes 5 are determined according to calculation.

When the heat pipe 5 works, the working medium 7 in the heat pipe 5 absorbs heat at the evaporation section of the heat pipe 5 and evaporates into a gas state to the condensation section of the heat pipe 5, and the heat emitted at the upper part of the heat pipe 5 through the radiator 6 is recovered into a liquid state and flows to the evaporation section through the inner wall of the heat pipe 5. Through the circulation process, heat is continuously and upwards conveyed to form unidirectional heat conduction from bottom to top, and partial heat in the cast-in-place bored concrete pile 2 and the peripheral permafrost layer 1 is brought to the air above the ground surface 3, so that the permafrost layer 1 achieves the cooling effect. The frozen soil layer 1 can not be melted after being kept in a low-temperature state for many years, so that the building 4 or other engineering foundations can not be unevenly deformed to cause damage to the building 4 and the like.

The embodiment is regional permafrost with environment comprehensive observation research station (being located the Tibet plateau abdominium, 34.2 'in the north latitude, 92.4' in the east longitude, 4628 m in altitude) in the engineering of regional frozen soil of the north foot river of the Tibet plateau of China academy of sciences, 2017 the house is built in-process part pile foundation and is adopted the utility model discloses: the pile diameter of the pile foundation is 0.8m, the pile length is 10m, the evaporation section of the heat pipe is 8m, the condensation section is 2.2m, the length of the part with fins is 1.4m, the width of the fins is 19mm, and the spacing between the fins is 10 mm. Compared with the temperature of a natural site, the maximum temperature difference of the side temperature of the hot-containing pipe pile at the depth of 4m in the first cold season after the building is built can reach 2.61 ℃, namely: the temperature of the side of the heat-containing pipe pile at the depth of 4m is 2.61 ℃ lower than that of a natural field, so that the heat-containing pipe pile foundation has a remarkable cooling effect.

Claims

1. The utility model provides a structure that cast-in-place bored concrete pile in perennial frozen soil area combines heat pipe to cool down for frozen soil which characterized in that: the structure comprises a cast-in-situ cast-in-place pile (2) arranged in a perennial frozen soil layer (1) and a heat pipe (5) internally provided with a working medium (7); the lower evaporation section of the heat pipe (5) is buried in the cast-in-place pile (2), and the upper condensation section is arranged between the ground surface (3) and the building (4); and a radiator (6) is arranged at the upper part of the heat pipe (5).