Integrity detection method of large-diameter cast-in-situ pile hole wall during construction of cast-in-place pile foundation

Abstract

The invention discloses a method for detecting the rock mass integrity of the hole wall of a large-diameter cast-in-place pile synchronously during the construction of the cast-in-place pile foundation, including (1) during the construction of the large-diameter cast-in-place pile foundation in the karst area, after the pile hole of the cast-in-place pile is completed, concrete pouring Previously, multiple detection sections were arranged on the inner wall of the pile hole along the axial direction of the pile hole; (2) acoustic logging equipment was used; (3) the detection was started after the transmitting probe and receiving probe were stabilized, and the detection results were saved using the time profile waveform diagram (4) analyze the time profile waveform diagram that step (3) obtains, divide complete rock mass and soil layer, karst; (5) calculate the complete rock wall area of ​​whole pile hole wall after the completion of all detection section detection, as It provides a basis for the calculation of pile foundation pullout force and pile side friction resistance of cast-in-situ piles. The detection method is fast and accurate, can greatly shorten the construction period, reduce manpower and material resources, and reduce the difficulty and risk of pile foundation construction.

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...

AI Technical Summary

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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