Method for detecting integrity of hole wall rock mass of large-diameter cast-in-place pile during pile foundation construction period of cast-in-place pile

Abstract

The invention discloses a method for detecting integrity of hole wall rock mass of a large-diameter cast-in-place pile during a pile foundation construction period of the cast-in-place pile. The method comprises the following steps: (1) arranging a plurality of detecting fracture surfaces, in the axial direction of a pile hole, on the inner wall of the pile hole after the pile hole of the cast-in-place pile is completed and before concrete is poured during the pile foundation construction period of the large-diameter cast-in-place pile in a karst region; (2) adopting an acoustic well logging equipment; (3) starting detection after an emitting probe and a receiving probe are stable, and storing detected results by adopting a time section oscillogram; (4) analyzing the time section oscillogram obtained in step (3), and dividing intact rock mass, a soil layer and karst; and (5) after all to-be-detected fracture sections are detected, calculating complete rock wall area of the whole pile hole wall, and providing basis for calculating pile foundation pulling resistance and pile side frictional resistance of the cast-in-place pile. The detecting method is quick and accurate, can greatly shorten the construction period, can reduce manpower and material resources, and can reduce construction difficulty and construction risk of the pile foundation.

Description

technical field [0001] The invention relates to a method for detecting the hole wall rock mass of cast-in-situ piles in construction engineering, in particular to a method for detecting the integrity of the hole wall rock mass of large-diameter cast-in-place piles which is carried out synchronously during the construction of the cast-in-place pile foundation. Background technique [0002] The area of ​​the complete bedrock around the pile is one of the necessary basis for the calculation of the pullout force and pile side friction resistance of the large-diameter cast-in-place pile. The area of ​​the complete bedrock around the pile is equal to the product of the length of the pile entering the complete bedrock and the circumference of the pile. . [0003] At present, the pile foundation pullout force and pile side friction resistance of large-diameter cast-in-situ piles are mainly estimated based on the results of advanced drilling. Due to the limited number of advanced dr...

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Problems solved by technology

[0009] 2. The detection environment is different

[0012] 2. The detection environment is different

[0013] 3. Different types of elastic waves for detection applications

[0014] 4. The elastic wave parameters used for judgment and interpretation are different

The Chinese patent with the application number ZL200310112325.0 is only used to determine the properties of the rock and soil next to the drilling hole;

[0017] 2. The detection environment is different

[0018] 3. The timing of detection is different

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