Rock-soil mixed vertical shaft engineering supporting system and vertical shaft construction method

Abstract

The invention provides a rock-soil mixed vertical shaft supporting system. The rock-soil mixed vertical shaft supporting system comprises a soil layer supporting structure, a rock-soil connection supporting structure and a rock layer supporting structure. The soil layer supporting structure comprises fender posts, top beams, a first support and second supports. The rock-soil connection supportingstructure comprises lock foot supports, lock foot ring beams and first anchor rods. The rock layer supporting structure comprises annular steel supports and transverse steel supports. The first anchorrods are arranged at the connection positions of the annular steel supports and the fender posts and are obliquely embedded into a rock layer. Different supporting systems are adopted according to the characteristics of a soil layer and the rock layer, the soil layer is loose in structure, and therefore the upper soil layer is supported by pile supports; and a containment structure is large in rigidity, and the safety of engineering and surroundings can be guaranteed better. The rock layer is firm in structure, and therefore the lower rock layer is supported by steel frame anchor plates, andthe rock layer is used for providing supporting force to obtain enough supporting rigidity. Meanwhile, compared with a supporting structure with a straight pile, the supporting system saves the construction period and engineering investment.

Description

technical field [0001] The invention relates to the field of underground engineering construction, in particular to a rock-soil mixed shaft engineering support system and a shaft construction method. Background technique [0002] For the vertical shaft engineering with deep soil layer on the upper part and rock layer on the lower part, it is called geotechnical mixed vertical shaft engineering. At present, the main support systems for rock-soil mixed shafts include the following support methods: [0003] 1. Regardless of the rock or soil layer, the primary support system (steel frame, anchor rod, shotcrete) is adopted, and the vertical construction is carried out from the ground surface from top to bottom; [0004] 2. The upper soil layer is constructed by grading + soil nailing wall. The bottom of the grading slope is generally the rock-soil interface, and the shaft in the lower rock section is constructed vertically from top to bottom starting from the bottom of the gradi...

AI Technical Summary

Problems solved by technology

[0007] Aiming at the deficiencies in the prior art, the rock-soil mixed shaft engineering support system and the shaft construction method provided by the present invention solve the problems of the existing vertical shaft construction support system for the depth of the soil layer, the distribution of groundwater at the soil layer and the rock-soil interface or the surrounding areas. For shaft projects with high environmental requirements, the support rigidity is insufficient, and there are certain technical problems of potential safety hazards

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