Composite structure for protecting soil body temperature and application method thereof

Abstract

The invention relates to a composite structure for protecting soil body temperature and an application method thereof. The composite material comprises an insulating material layer (1) and a three-dimensional elastic net layer (2) arranged at the bottom of the insulating material layer (1). The three-dimensional elastic net layer (2) has a certain thickness, and can be flattened if being stressedand can stretch to jack up an insulating part on the top if being released. The composite structure is good in elasticity and variable in thickness, so that the composite structure is folded and unfolded mechanically and covered secondarily conveniently. The composite structure is hard to destroy, and meanwhile, the paved composite structure is equivalent to a supporting air layer. Air is a poor conductor of heat, so that the insulating performance of the whole composite structure is improved greatly. According to the composite structure, waterproof material layers are arranged on the upper and lower surfaces of the insulating material layer, so that the properties of the insulating material are kept stable for a long time, and the insulating efficiency is prevented from changing.

Description

technical field [0001] The invention relates to the technical field of engineering construction in permafrost regions, in particular to a composite structure for protecting soil temperature and its application method. Background technique [0002] Permafrost refers to soil and rocks with negative temperature and ice, which can be generally divided into short-term frozen soil (several hours / days to half a month), seasonal frozen soil (half a month to several months) and permafrost (also known as permanent frozen soil). permafrost for two or more years). my country's permafrost covers an area of ​​about 2.15 million square kilometers, accounting for about 22% of the country's land area, ranking third in the world. It is mainly distributed in the Qinghai-Tibet Plateau, Northeast China, Xiaoxing'an Mountains, Tianshan Mountains, and Altai Mountains. In areas where the winter temperature is below 0°C, short-term frozen soil and seasonal frozen soil basically exist, accounting fo...

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Problems solved by technology

Moreover, in the winter construction of a hydropower station with an earth-core rockfill dam, the core wall of the dam that has already been filled is the focus of prevention and control, especially for high dams and extra-high dams, and the on-site filling area can often reach tens of thousands of square meters. Even tens of thousands of square meters, the length and width of the filling core wall can reach hundreds or even hundreds of meters. In this case, in order to ensure the efficiency of on-site work, the covering and recycling of thermal insulation materials can only be carried out by large machinery

[0006] However, this mechanical retracting method faces the following problems: (1) It is required that the thermal insulation material should not be too thick, otherwise the rollers wrapped around the thermal insulation material will be too thick and heavy, and the mechanical retractable roller cannot carry out one-way, single-width thermal insulation material at one time. release or recovery; however, if the insulation material is not thick, the insulation performance cannot be guaranteed

(2) Under extremely low-temperature environmental conditions, if there is a situation where the existing thermal insulation material cannot prevent the covered soil from freezing and a second layer of thermal insulation material is required to cover it, large machinery cannot perform secondary coverage on the site covered with thermal insulation material , otherwise the covered insulation material is easily damaged under the rolling of large machinery

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