Shallow foundation pit freezing enclosure and construction method thereof

Abstract

The invention discloses a construction method of a shallow foundation pit freezing enclosure, which comprises the following steps that: A, freezing holes are formed around a foundation pit and internally provided with freezing pipes to form a frozen soil wall through freezing by an installed freezing system; B, grout is injected to the bottom of the pit for reinforcement; C, underground flowing water is inspected and cut off; D, hydrologic holes and observation holes are formed around a protective building (structure), and positions for pressure relief vents are reserved; E, the freezing is conducted positively and maintained to form a combined freezing wall structure; and F, freezing removal, thaw collapse and grout injection are conducted after structural construction. As the freezing enclosure for the shallow foundation pit is constructed, the construction safety of underground works at the water-rich strata mainly containing sandy silt and mealy sand can be ensured, the deformation of integrated municipal pipelines outside the foundation pit, short-distance operation rail transit station tracks, and the peripheral protective building (structure) can be effectively controlled; the requirements of construction of the large integrated municipal pipelines adjacently laid in the foundation pit can be met; an effective and systemic technical guarantee system is provided for the design and construction of the foundation pit; and the smooth implementation of the works is ensured.

Description

technical field [0001] The invention relates to the construction of foundation pits and open-cut tunnels in the technical field of construction engineering, in particular to a freezing enclosure of shallow foundation pits under complex environmental conditions and a construction method thereof. Background technique [0002] With the development of urban construction, more and more urban traffic and buildings are emerging. As an auxiliary construction method, foundation pit engineering has been developed in the long run, but there are great difficulties in the design and construction of foundation pit engineering in the central area of ​​the city, especially in the surrounding areas with dense integrated pipelines, silty soft soil strata, and traffic-intensive areas. [0003] The construction of the foundation pit project in the soft soil layer will inevitably cause disturbance and deformation of the surrounding soil layer, and the pipeline and the foundation of the building ...

AI Technical Summary

Problems solved by technology

[0004] Conventional foundation pit engineering construction generally adopts measures such as sloping excavation, pile row enclosure construction, and slab supp

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