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Shallow foundation pit freezing enclosure and construction method thereof

A construction method and technology for foundation pits, which are applied in basic structure engineering, excavation, construction, etc., can solve problems such as difficulty in meeting the protection requirements of surrounding pipelines and buildings (structures), and achieve high construction efficiency and control the surrounding of foundation pits. The effect of protecting deformation and environmental pollution is small

Inactive Publication Date: 2012-12-26
SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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  • Abstract
  • Description
  • Claims
  • Application Information

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 support, but these methods are difficult to achieve in the construction of foundation pits under complex environmental conditions. property protection requirements

Method used

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  • Shallow foundation pit freezing enclosure and construction method thereof
  • Shallow foundation pit freezing enclosure and construction method thereof
  • Shallow foundation pit freezing enclosure and construction method thereof

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Embodiment Construction

[0014] The present invention will be further described below in conjunction with specific embodiments of the present invention and accompanying drawings. It should be understood that these embodiments are only used to illustrate the patent of the present invention and are not intended to limit the scope of the patent of the present invention. In addition, it should be understood that after reading the content taught by the patent of the present invention, those skilled in the art can make various changes or modifications to the present invention, and these equivalent forms also fall within the scope defined by the appended claims of the present application.

[0015] Shallow foundation pit freezing enclosure includes freezing holes arranged around the foundation pit, and a freezing pipe and a freezing system connected to it are arranged in the freezing hole. After freezing, a frozen wall is formed. The depth of the frozen wall depends on the resistance of the foundation soil. T...

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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 ...

Claims

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Application Information

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IPC IPC(8): E02D17/02E02D19/14
Inventor 林秀桂楼根达葛竞辉袁森林冯义鹏
Owner SHANGHAI MUNICIPAL ENG DESIGN INST GRP
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