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Construction method for soil freezing

A construction method and soil technology, applied in soil protection, infrastructure engineering, construction, etc., can solve the problems of high cost and long freezing time, and achieve the effect of fast cooling speed, low cost and reduced construction cost

Inactive Publication Date: 2016-03-23
SHANGHAI MECHANIZED CONSTR GRP
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Problems solved by technology

[0005] The purpose of the present invention is to provide a construction method for soil freezing to solve the problems of longer freezing time and higher cost in the prior art

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Embodiment Construction

[0014] The specific implementation manner of the present invention will be described in more detail below with reference to schematic diagrams. Advantages and features of the present invention will be apparent from the following description and claims. It should be noted that all the drawings are in a very simplified form and use imprecise scales, and are only used to facilitate and clearly assist the purpose of illustrating the embodiments of the present invention.

[0015] The inventor found through a large number of tests that it generally takes 40 to 60 days to freeze to the set freezing temperature only by using salt water to freeze. Among them, the high-efficiency freezing period of brine freezing is generally 15-20 days. During this period, the temperature of the freezing curtain and the temperature of the frozen soil drop rapidly, and it is generally easy to reach 0-2°C. The average cooling rate at this time is 1.5-2°C. 2°C / d (degrees Celsius / day). After the freezing...

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Abstract

The invention provides a construction method for soil freezing. The method includes the steps that firstly, brine freezing construction operation is conducted on soil; and secondly, the temperature of the soil is measured, and when the temperature of the soil is below zero, liquid nitrogen freezing construction operation is conducted on the soil until the temperature of the soil is decreased to a set freezing temperature. According to the construction method for soil freezing, the characteristics that brine freezing cost is low and the temperature decrease speed and efficiency of earlier-stage brine freezing are high are used to the maximum extent and combined with the characteristic of quick liquid nitrogen freezing, so that a reinforcing body rapidly reaches the required temperature, and the requirement for soil reinforcement is met. Freezing construction efficiency can be effectively improved, construction cost is lowered, and the method is suitable for freezing construction under various complex geological conditions, especially the geological conditions of large underground water level changes due to the influence of surrounding rivers, seasonal rainfall, surrounding precipitation construction and the like.

Description

technical field [0001] The invention belongs to the technical field of soil freezing, in particular to a construction method for soil freezing. Background technique [0002] When freezing soil, salt water freezing and liquid nitrogen freezing construction are currently the two most commonly used techniques. [0003] As a good freezing medium, brine is generally used at a temperature of -28 to 30°C during the active freezing period, and brine freezing construction is widely used in freezing reinforcement construction because of its low cost, simple equipment, and easy operation. But brine freezing has the disadvantage of longer freezing time, which generally requires a freezing period of 40 to 50 days. [0004] Liquid nitrogen is an ideal refrigeration medium. Under normal pressure, its boiling point is -195.8°C, and its latent heat of evaporation is 250kJ / m3. The liquid nitrogen freezing process can be called "quick freezing process", because it only takes a short time to...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): E02D3/115
CPCE02D3/115
Inventor 金福强詹惠粟蒋一德
Owner SHANGHAI MECHANIZED CONSTR GRP
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