Fabricated steel supporting device of irregular foundation pit and construction application method of fabricated steel supporting device

Abstract

The invention discloses a fabricated steel supporting device of an irregular foundation pit and a construction application method of the fabricated steel supporting device. The irregular foundation pit refers to that the side line of the foundation pit is in an irregular multilateral shape. A reinforced concrete cross beam and a reinforced concrete plate are adopted by a reinforced concrete framestructure to form a closed large-rigidity supporting structure. The irregular foundation pit is defined and sealed by a reinforced concrete beam plate frame structure to form a rectangular regular foundation pit. H-shaped steel or steel pipes are adopted by fabricated steel supports. Steel angle braces and steel braces are arranged in the regular foundation pit formed by the steel supports. The steel braces are connected to form an overall steel supporting structure through H-shaped steel transverse connecting rods. The steel braces are connected to form an overall steel support through H-shaped steel inclined connecting rods. Steel stand columns are vertically arranged on the steel supports. The steel supports are connected with support pile crown beams or enclosing purlins through triangular mesh parts. The fabricated steel supporting device is short in whole project duration, the construction plant is spacious, and material transporting and stacking are convenient; and the construction efficiency and safety are guaranteed better, and meanwhile the aim of reducing the construction cost is achieved.

Description

technical field [0001] The invention relates to the field of foundation pit support engineering in which irregular areas exist in foundation pits in underground space development, in particular to an assembled steel support device and a construction application method for irregular foundation pit support projects in underground space excavation . Background technique [0002] With the development of urban construction, the available land in urban areas is getting less and less, and the conditions of construction sites are getting worse and worse. The development of underground space needs to be carried out in complex and extremely irregular sites, so there is the problem of excavating irregular foundation pits. Irregular foundation pits are complex in force and difficult to set up internal supports, especially the application of fabricated steel supports is limited, because the force requirements of steel supports require simple support, balance and force levels. Therefore...

AI Technical Summary

Problems solved by technology

But still there are following disadvantages: (1) the internal support of the present invention adopts all concrete beams, for large-area deep foundation pits, the construction speed of concrete large-area concrete internal support is slow, and the maintenance time is long, resulting in too long construction period; (2) A large area of ​​concrete internal support is used in the foundation pit, which is difficult to dismantle later, and will cause dust pollution and a large amount of concrete waste, polluting the environment

(3) The inner support cannot be reused and is uneconomical

However, there are still the following disadvantages: (1) the present invention adopts the form of anchor rods to retain soil, which will inevitably make the anchor rods exceed the red line of the land, leaving an obstacle that cannot be pulled out for the foundation outside the pit, which seriously affects the construction of subsequent projects; (2) for Weak soils such as silt and silt are supported by bolts. Because the side resistance of the bolt is too small, the deformation of the foundation pit is too large, which affects the safety of the foundation pit environment.

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