Non-eccentric vertical vibration device and method for pile foundation with cap based on snap-in device

Abstract

The invention discloses a non-eccentric vertical vibration device and method for a pile foundation with caps based on a buckle-type device. The present invention can use bolts to fix the half-type platform to a certain height of the pile body exposed on the ground surface, so that the half-type loading ring can be spliced ​​at the pile body on the upper part of the platform, and the clamp can be used after it is assembled into a whole Lift the loading ring to a certain height, loosen the clamp, and the loading ring freely falls to the platform to apply excitation, which provides a non-eccentric vertical loading method for the pile foundation inspection under the existing cap. The loading method and device proposed by the present invention subtly overcome the disadvantage of being unable to perform vertical knocking on the top of the pile foundation to be tested with a cap in the traditional low-strain test, and the component connection has high repeatability and can be connected into various shapes , conveniently adjust the inner diameter of the loading ring to meet the positioning of workpieces of different shapes. The invention is suitable for the non-eccentric vertical excitation in the low-strain integrity detection of the pile foundation to be tested under the existing buildings.

Description

technical field [0001] The invention belongs to the field of pile foundation loading, and in particular relates to a non-eccentric vertical vibration device and method for a pile foundation with caps based on a buckle-type device. Background technique [0002] Pile foundations with large caps on the upper part are widely used in existing buildings. Pile foundations with high caps, as the main force-bearing components of such buildings, may be damaged under the influence of external loads for a long time. Integrity assessment during long-term use to ensure pile foundation quality. When performing low-strain detection on common pile foundations, hammers of various materials are usually used to hit the top of the pile, and the integrity of the pile body is judged based on the response of the velocity signal collected by the pile top sensor. [0003] However, when testing the pile foundation under the existing building, due to the existence of the superstructure, the vertical e...

AI Technical Summary

Problems solved by technology

For large-diameter piles, it is more obviously affected by the eccentric effect, which makes the results of the velocity response waveform of the pile mass point messy, and it is difficult to intuitively judge the reflection area at the bottom of the pile

Moreover, the traditional load excitation method is mostly manual tapping with a small hammer. The force point of the tapping and the size of the hammer have a great influence on the result waveform, and the requirements for the test quality of the participants are relatively high.

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