Bored pile height detecting device and detecting method thereof

Abstract

The invention discloses a bored pile height detecting device and a detecting method thereof. The bored pile height detecting device comprises a frequency acquisition instrument, a tray, a pressure boxand a sampling tube; convex circular grooves are formed in the upper surface and the lower surface of the tray, wherein the upper circular groove is used for placing the pressure box, and the lower circular groove is used for being connected with the sampling tube; when in use, the tray to which the sampling tube is connected is lowered in a borehole, and the sampling tube penetrates through a mud layer and stops after reaching a concrete layer; then, the tray is lifted, a leak-stopping blade in the sampling tube is reset to close a tube opening, the sampling tube is moved out of the borehole, an interface between a mixed layer and concrete is judged from a see-through window on the sampling tube, and the thickness of the mixed layer is recorded; and the sampling tube is separated from the tray, the pressure box is placed on the tray, then the tray is lowered in the borehole, the frequency of the pressure box is collected in real time, the pressure of overlying mud to the pressure boxis calculated according to a formula, the unit weight of the mud is measured to get the height of the pressure box from an orifice, and the height of the pressure box from the orifice and the thickness of the mixed layer are subtracted from the total height of the borehole to get the height of pouring the concrete.

Description

technical field [0001] The invention belongs to the technical field of pile foundation detection, and in particular relates to a height detection device and a detection method for bored cast-in-place piles. Background technique [0002] Bored piles play an important role in ensuring the structural stability of the project and the quality assurance of the foundation construction of the project. As the most effective measure to ensure the quality of the pile body, the detection of concrete overfilling height has been highly concerned by relevant professionals at home and abroad. The accuracy of its detection method can directly affect the quality and progress of engineering foundation construction. [0003] At present, heavy hammer detection method and cone measurement method are mostly used to measure the pile top elevation of bored piles on site. Although this method is easy to operate, it requires extremely high experience of operators, and the detection results are extreme...

AI Technical Summary

Problems solved by technology

[0003] At present, heavy hammer detection method and cone measurement method are mostly used to measure the pile top elevation of bored piles on site. Although this method is easy to operate, it requires extremely high experience of operators, and the detection results are extremely inaccurate , it often occurs that when the pile head is broken to the design elevation, the lightness and density of the concrete cannot meet the design requirements, resulting in the quality of the cast-in-place pile being unable to be guaranteed; or the overfilling height of the concrete is relatively large, resulting in a serious waste of concrete , which not only increases the material cost, but also increases the personnel cost and workload of removing the pile head in the later stage, which seriously affects the construction progress

[0004] Traditional monitoring and detection methods have many defects such as high labor costs, large error results, and susceptibility to external factors. With the development and improvement of automation technology, more and more engineers and technicians have begun to use it with The combination of engineering monitoring and detection technology, such as the popularization and application of laser range finder, automatic inclinometer, vibrating axial force meter and vibrating earth pressure cell in deep foundation pit engineering, etc., at present, automatic detection technology relies on The advantages of high precision, high frequency and high efficiency are gradually replacing traditional monitoring and detection methods

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