What are the characteristics of the starting freezing reinforcement method of shield?

What are the characteristics of shield freezing reinforcement method? The following is a detailed introduction of Zhong Da Consulting for your reference.

(1) The reinforcement effect is good and the water stopping effect is obvious. Freezing method uses low-temperature brine circulation to take away formation heat, and forms frozen soil curtain by lowering formation temperature. Most of the water in the soil is frozen by freezing reinforcement, and the strength of frozen body can usually reach 5~ 10MPa, which can reduce the added solid volume. The structural strength is uniform, and the water blocking effect is incomparable with other methods.

⑵ When the frozen soil reaches the design temperature, its mechanical properties such as compressive strength, shear strength and tensile strength are obviously improved.

(3) Wide adaptability. It is suitable for any loose rock and soil layer with a certain amount of water, and the freezing technology is effective and feasible in complex engineering and hydrogeology such as soft soil, unstable layer with water, quicksand, high water pressure and high ground pressure, and large buried depth.

(4) The biggest pollution of freezing engineering construction is that a small amount of mud is discharged during drilling, and no harmful substances are injected into the stratum during freezing. After the freezing project is completed, the stratum will naturally melt and recover to its original state, and there will be no underground obstacles in the stratum that will hinder the construction of other projects, which is a "green" construction method.

5] The frozen reinforced soil is uniform and has good integrity. The shape and size of frozen concrete can be flexibly designed as required, and the designed soil can be frozen into frozen soil, forming a curtain for underground engineering construction. Soil layer grouting and deep mixing pile are only local reinforcement of soil, the reinforcement scope is not easy to control, and the solid strength is uneven.

[6] During the normal operation of freezing construction, generally only 6~8 operators are needed per shift, which saves a lot of labor.

Used to occupy a small construction site. Freezing method construction only needs the ground to provide the land occupied by cooling towers and refrigeration units and the land with solid added by itself.

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