High-strain detection method for concrete-filled steel pipe piles

Abstract

The invention relates to a high-strain detecting method for a concrete filled steel tube pile. The method includes the following steps that at the positions, being apart from the pile top of the concrete filled steel tube pile by one to three times of the diameter, of the inner and outer sides of the tube pile, namely at the steel tube outer wall on the outer side of the tube pile and the concrete side inner wall on the inner side of the tube pile, two pairs of high-strain detecting sensors are arranged correspondingly, and the high-strain detecting sensors comprise impact force sensors and impact response sensors and are connected to a high-strain detecting instrument through wires; the pile top of the concrete filled steel tube pile is hammered; concrete fluctuation signals under the pile top hammering effect are detected through the high-strain detecting sensors, and steel tube fluctuation signals under the hammering effect are detected through the high-strain detecting sensors installed on steel tubes on the outer side of the tube pile; and the steel tube concrete tube pile longitudinal wave velocity is calculated, and the single pile bearing capacity and the pile body integrity coefficient are subject to correction computation. According to the high-strain detecting method, the problems about high-strain detecting sensor installation and longitudinal wave velocity calculation of the concrete filled steel tube pile made of two materials under the hammering effect are solved, and the single pile bearing capacity and the pile body integrity coefficient are corrected.

Description

technical field [0001] The invention relates to pile foundation engineering and a detection method, in particular to a high strain detection method for steel pipe concrete pipe piles. Background technique [0002] Concrete pile testing usually uses endoscopic testing methods, ultrasonic testing methods, and high-strain testing methods. [0003] As disclosed in Chinese Patent No. 200710042773.6 "Endoscopic Inspection Method for the Integrity of Steel Pipe Centrifugal Concrete Pile", it is to hang the camera in the steel pipe centrifugal concrete pile hole, the camera is connected to the computer through a waterproof cable, and the camera is also connected to the scale The rope ruler, the camera obtains the information in the pipe pile hole and displays the camera image on the computer display screen and stores it in the memory; by processing the endoscopic photography image, the groundwater and soil core information in the pipe pile hole can be obtained, as well as the inform...

AI Technical Summary

Problems solved by technology

[0008] The purpose of the present invention is to provide a high-strain detection method for concrete-filled steel pipe piles, which solves the problems of the installation of high-strain detection sensors and the calculation of longitudinal wave velocity for concrete-filled steel pipe piles composed of two materials under the action of hammering, and corrects the bearing capacity of single piles and calculation method of pile integrity coefficient

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