A construction method of ultra-deep buried test piles in rock formations

Abstract

The invention discloses a construction method for super-buried test piles in rock strata, which belongs to the field of test pile construction. The technical problems to be solved by the invention are that it is difficult to form holes in complex rock strata often encountered by cast-in-situ piles, and the super-filling elevation of underwater concrete cannot be accurate. Controlling, operating conditions of ultra-deep foundation pit bottom static load detection are limited, and controlling frictional resistance affects load-bearing detection. The technical solution is as follows: S1, construction preparation; S2, advance drilling exploration, and establish a BIM model of the rock surface; S3, positioning And bury the casing, and make and place the double sleeve of the test pile; S4, the drilling rig is in place, the drill pipe is centered and the verticality is adjusted; S5, the soil layer drilling, the retaining wall and the multi-level stepped drilling of the rock layer; S6 1. Use the internal and external double control method to monitor the verticality of the drill pipe; S7. According to step 2, carry out the production of the steel cage and the installation of the anti-floating structure, and hang the steel cage and install the superfill monitoring probe; S8. Secondary hole cleaning by circulation method; S9, monitoring of underwater concrete pouring and overfilling height.

Description

technical field [0001] The invention relates to the field of construction of test piles before excavation of building foundations, in particular to a construction method of super-buried depth test piles in rock layers. Background technique [0002] The test pile is a test device used before construction. Its purpose is to detect whether the bearing capacity and settlement of the pile foundation are consistent with the design, so as to ensure the construction quality. The test piles are generally carried out before the excavation of the building foundation pit or before the excavation to the bottom level of the groove. [0003] With the continuous increase of large-scale super high-rise and underground space construction projects, the foundation depth is also increasing, and the number of similar projects is increasing. Subsequently, the buried depth of the pile top is also increasing, and engineering piles with a buried depth of up to 25m have become relatively common. For...

AI Technical Summary

Problems solved by technology

[0005] The technical task of the present invention is to provide a construction method for ultra-deep buried test piles in rock formations to solve the difficulties in forming holes in complex rock formations often encountered by cast-in-situ piles, the inability to accurately control the super-filling elevation of underwater concrete, and the static load at the bottom of ultra-deep foundation pits. The detection operation conditions are limited, and the control of frictional resistance affects the bearing detection problem

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