Method for detecting and reinforcing vertical bearing force of defective large-diameter socketed pile

Abstract

The invention provides a method for detecting and reinforcing vertical bearing force of a large-diameter rock upper end bearing pile in construction of high-rise buildings and bridges. The method includes the specific steps that firstly, a large-diameter socketed pile is constructed, and in the pile center nearby a drilling core hole where a rock core cannot be taken out, holes with the diameter larger than or equal to 320 mm are drilled through a large-diameter drilling machine till the holes are drilled in the pile bottom; secondly, when it is tested that the ultimate tip resistance standard value of a rock-soil layer on the tip of the detected pile does not meet the design requirement through a small pressing plate, in the position of original detecting holes, a rotary drilling machine capable of drilling rock or a punching machine drills or punches holes again in the positions of original drilled holes; thirdly, the rotary drilling machine capable of drilling rock or the punching machine is directly used for drilling holes in the middle of an original pile till the holes are drilled in the pile bottom, and core pile design is calculated and determined through supplemented construction reconnaissance hole drilling; and fourthly, by additionally arranging a core pile and improving the pile tip bearing force and the pile body bearing force of the core pile, the situation that the bearing force of single piles is reduced because of local defects of a pile tip bearing stratum can be compensated for. The method is simple and feasible and is used when defects are found in the large-diameter socketed pile checking and accepting process, and the purpose of determining, reinforcing and checking and accepting the bearing force of a pile foundation is achieved.

Description

technical field [0001] The invention relates to the technical field of geotechnical processes, in particular to a method for detecting and reinforcing the vertical bearing capacity of large-diameter rock upper-end bearing piles in the process of building tall buildings and bridges. Background technique [0002] Large-diameter piles need to be poured during the construction of tall buildings and bridges. When large-diameter piles are built on the upper end of the rock, the builder and the construction party need to test the vertical bearing capacity of the upper end of the rock. Generally, the upper end of the large-diameter rock The pile has the characteristics of high end-bearing capacity of the rock formation at the pile end, the vertical bearing capacity of the pile is dominated by the end-bearing capacity, the side resistance of the pile can be neglected for safety, and the vertical bearing capacity of a single pile is designed to be relatively large. The required test p...

AI Technical Summary

Problems solved by technology

[0014] Aiming at the construction process of large-diameter rock-socketed piles in the project, a relatively simple and feasible method is proposed to solve the problems of pile foundation detection and reinforcement acceptance

Images