Multi-direction rotary jetting stirring grouting reinforcement construction method for constructing underground structure and soil body by cover excavation and underground excavation and supporting structure thereof

Abstract

The invention relates to a cover excavation and underground excavation advance multi-direction rotary jetting stirring grouting reinforcement active supporting construction method and a supporting structure thereof. The invention aims to design and invent a multi-direction rotary jetting stirring advance reinforcement and active supporting system in cover excavation and underground excavation construction of underground engineering. The effective supporting reinforcement structure can ensure the safety in the cover excavation and underground excavation construction. The technical structure can control soft soil around an underground structure not to deform and the like, thereby being beneficial to playing a good protecting role in shallow buried underground excavation construction; under the protection of a reinforced hard shell, the problems of water leakage, piping, collapse, soil body deformation and the like cannot be caused in underground soil excavation, and the underground soil excavation and structure construction is under the protection of the reinforced hard shell, therefore, the smooth construction of underground engineering can be ensured.

Description

Technical field: [0001] The patent of the invention belongs to the technical field of underground engineering and underground building construction, and in particular relates to a cover excavation and underground excavation operation. Background technique: [0002] At present, the widely used cover-excavation method and underground excavation method in the construction of underground space lack the function of reinforcing and supporting the soil in advance. It is very difficult to excavate underground, especially in water-bearing soft soil layers, especially in Complex soil layers, such as silt, loose sand layers, saturated flow-plastic soil layers, etc. The traditional cover-excavation and underground excavation technologies have great limitations, and it is difficult to avoid accidents such as water leakage, piping, and collapse. Although various measures have been taken , but it is impossible to solve the problem of ground control without deformation of the soft soil foun...

AI Technical Summary

Problems solved by technology

[0002] At present, the widely used cover-excavation method and underground excavation method in the construction of underground space lack the function of reinforcing and supporting the soil in advance. It is very difficult to excavate underground, especially in water-bearing soft soil layers, especially in Complex soil layers, such as silt, loose sand layers, saturated flow-plastic soil layers, etc. The traditional cover-excavation and underground excavation technologies have great limitations, and it is difficult to avoid accidents such as water leakage, piping, and collapse. Although various measures have been taken , but it is impossible to solve the problem of ground control without deformation of the soft soil foundation. It is easy to encounter sand and silt soil layers when digging underground in the cave to connect columns and reinforcements, and to dig piles for the foundation. Due to its special geological environment, Geological environmental problems are prone to occur, causing sudden geological disasters, etc., and it is difficult to deal with. Especially in vertical and horizontal excavation, the soft soil on the upper side, the soft soil on the side walls and the soft soil on the front support surface are not self-stabilizing. The ability to collapse is unavoidable. Large-scale machinery cannot be used to construct piles in the underground construction of cover excavation and underground excavation. Most of them use manual excavation piles. However, due to the water-containing soft sandy soil is very easy to deform, landslide accidents often occur, and conventional methods are difficult to construct. Large. The above-mentioned various construction problems limit the wide application of the cover-excavation method and the underground excavation method. In order to overcome the above-mentioned defects, the present invention is mainly aimed at the cover-excavation and underground excavation methods of underground engineering without all-round advanced soft soil reinforcement and advanced support In view of the technical shortcomings, technological improvement and invention innovation have been carried out, and a construction method of all-round advanced reinforcement, active support, and protective cover excavation has been developed. Some ideas of this method have been practically applied in engineering Especially for large-span underground shopping malls and parking garage tunnels built in complex soft soil strata, such as underground structures, the soft soil around the periphery is reinforced by all-round rotary jet mixing and grouting to form a mixed cement-soil reinforced "egg Under the advanced protection of eggshells, the above-mentioned accidents are avoided and difficult problems are solved. In addition, in the underground construction of pile foundations in large spaces, large-scale machinery cannot be used for construction, and only very dangerous manual hole-digging piles can be used. In soft soil, many problems cannot be solved. In view of the above, this patent adopts a small-scale rotary spraying mixing machine, and first applies a cement-soil rotary spraying mixing pile with an enlarged support plate to the foundation soil, and then the reinforcement core and the reinforcement required for the uplift pile in the pile , to solve the above problems, thereby changing the construction method of cover-excavation and underground excavation method pile foundation and the process of connecting piles and reinforcing bars to avoid accidents, ensure quality, save cost and speed up construction period

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