Bored pile concrete interface monitoring device and method

Abstract

The invention relates to a bored pile concrete interface monitoring device which is designed through an electrical impedance physical property testing method for media such as concrete, slurry and water in the bored pile underwater concrete pouring process and sensitivity test analysis and through researches on the testing method and instrument for an underwater electrical impedance testing probe and underwater concrete pouring elevation positioning. The bored pile concrete interface monitoring device comprises a ground host, a probe electronic cavity, a push rod arranged on the top of the probe electronic cavity, an insulation rod arranged at the bottom of the probe electronic cavity, a first electrode, a second electrode, a resistance value measuring module and an analog-digital converter, wherein the first electrode and the second electrode are fixedly connected to the insulation rod in a sleeving mode, and the resistance value measuring module and the analog-digital converter are arranged in the probe electronic cavity. According to the key technological principle, in the pouring process of a pouring hole, the electrical impedance of water and slurry is obviously different form that of the concrete, and the positioning of the concrete pouring interface (or depth) is achieved by measuring the difference.

Description

technical field [0001] The invention relates to the technical field of underwater concrete pouring of bored cast-in-place piles in basic construction engineering, in particular to a device and method for monitoring the concrete interface of bored cast-in-place piles. Background technique [0002] With the vigorous development of engineering construction in my country, cast-in-situ pile foundation engineering is widely used in large-scale projects such as high-rise buildings, bridges, port terminals, offshore oil production platforms, and nuclear power plants, and has become the most important form of foundation engineering in engineering construction. The wide use of cast-in-situ pile foundation projects and the increase of pile depth have increased the amount of concrete pouring. According to relevant statistics, most of the concrete pouring fields are below ±0.00, such as high-rise building foundations and underground caverns. , Underground tunnels, bridges, ports, docks a...

AI Technical Summary

Problems solved by technology

[0003] Because there is a mixture of mud above the concrete pouring surface, it is difficult to correctly position and control the real elevation of the concrete surface being poured. In the past engineering construction, the method of estimation was often used. In order to ensure the reliability of the pouring volume, the concrete pouring volume was often caused increase

It is especially obvious in the construction process of high-rise building foundation bored piles. Each pile often needs to be poured 2 to 4m more. On the one hand, it causes a serious waste of concrete resources and increases the difficulty of foundation excavation. On the other hand, it increases the project cost. construction cost and project construction cost, and brought about the environmental pollution problem of how to bury and dispose of excess concrete waste blocks

If the estimate is insufficient, the concrete pouring interface will be insufficient, which will affect the quality of the foundation project

[0004] How to control the pouring interface of concrete underwater to meet the requirements of the designed pouring interface in underwater concrete pouring? There is no corresponding monitoring method in China, and there are no special monitoring instruments and equipment. The estimation method is extremely inaccurate , the waste is large or the quality cannot be guaranteed; there is no special monitoring instrument or equipment in the world

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