A freezing support device and construction method

Abstract

The present invention provides a freezing support device and a construction method, comprising shrouds arranged in an array, connecting pieces between adjacent shrouds, and a freezing pipe located on the shroud and penetrating into the soil layer, wherein the shroud includes a hard upper layer. The casing and the supporting part provided on the lower surface of the hard casing are provided with grooves on the lower surface of the supporting part, and the edge of the rigid casing is fixedly connected with the connecting piece. In the present invention, the frost heave factor is considered, and the expansion of the frozen soil will not cause great damage to the support device through the internal structure of the enclosure plate.

Description

technical field [0001] The invention relates to the technical field of foundation pit freezing support, in particular to a freezing support device and a construction method. Background technique [0002] In recent years, with the continuous acceleration of urbanization in my country, the scale of underground engineering construction is also gradually expanding. At the same time, foundation pit engineering is also developing in both deep and wide areas. The protection is becoming more and more stringent and so on. Therefore, the technical challenges and construction risks faced by deep foundation pit support methods are increasing, especially in the water-rich and weak strata widely distributed in the eastern coastal areas of my country, where the natural soil moisture content is high, the strength is low, and its own bearing capacity is poor. , Waterproofing is difficult, which puts forward higher requirements for deep foundation pit support. Common deep foundation pit suppo...

AI Technical Summary

Problems solved by technology

Common deep foundation pit support methods include bored piles, underground diaphragm walls, soil nail walls, press-in type piles + rotary spray water-stop curtains, etc., but each has its limitations: for example, bored piles are easy to cause Water and soil erosion, high cost, poor water-stop performance; underground diaphragm wall has good water sealing and support capabilities, but the cost is too high; soil nail walls are only suitable for areas with low water content and good soil quality; press-in type piles + rotary Spraying the water-stop curtain has great requirements on the construction site, and the process is complicated. The cement and water-stop materials added to the soil have certain harm to the groundwater and soil.

[0003] In addition, there is artificial freezing support, but the existing foundation pit support specification does not consider the influence of frost heave factors. Construction according to the existing specification may cause excessive deformation of the support structure and foundation pit, and in severe cases, it will lead to unstable

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