Concrete continuity monitoring based pile foundation quality discrimination method and monitors

Abstract

The invention discloses a concrete continuity monitoring based pile foundation quality discrimination method. The concrete continuity monitoring based pile foundation quality discrimination method and monitor comprises the steps of arranging more than two pressure sensors at the bottom of a feeding guide pipe along the vertical height direction to serve as a group of monitors; collecting data on every pressure sensor and calculating the casting medium density Rho between every two pressure sensors; judging whether the concrete in the axial direction is continuous and complete or not after being solidified according to the continuity and the stability of a Rho value. The invention also discloses the monitors. The monitors comprise the plurality of pressure sensors which are separately distributed in the vertical direction and connected with a power supply, a data collector and a data integration processing and output module through a sealing circuit. According to the concrete continuity monitoring based pile foundation quality discrimination method and the monitors, the use is simple and convenient, the conclusion is reliable, a large amount of steel can be saved, and the labor, the time and the cost are saved.

Description

technical field [0001] The invention relates to the field of concrete pouring, more specifically, a detection method for judging the quality of a pile foundation based on monitoring whether the concrete is continuous during pouring, and a concrete pouring continuity monitor using the method. Background technique [0002] Cast-in-situ pile is the most widely used structural form in pile foundation engineering. To achieve the bearing capacity required by the design, the most important thing for the pile foundation is to ensure the continuity and integrity of the concrete. Since cast-in-situ piles are concealed projects, their pouring often starts from tens of meters or even hundreds of meters underground, and most of them are constructed under the water surface, so it is difficult to visually check the quality of the final pouring piles. In order to detect the quality of pile foundation, people have invented many methods, such as static load test method, low strain method, hig...

AI Technical Summary

Problems solved by technology

Since cast-in-situ piles are concealed projects, their pouring often starts from tens of meters or even hundreds of meters underground, and most of them are constructed under the water surface, so it is difficult to visually check the final pouring quality

In order to detect the quality of pile foundation, people have invented many methods, such as static load test method, low strain method, high strain method, pre-buried pipe ultrasonic transmission method, drilling core pulling method, direct excavation method, etc. Some of these methods The cost is high (static load test method, drilling core-pulling method, direct excavation method), and some have multiple solutions for judgment (such as low-strain method, high-strain method); pre-buried pipe ultrasonic transmission method is currently widely used A detection method, but this method needs to bury the acoustic tube in advance. In order to fix the acoustic tube, the main reinforcement of the steel cage must extend to the bottom of the pile, which will increase a lot of materials for no reason, and does not include the follow-up testing cost; the acoustic tube If it is blocked during the construction process, it will not be able to detect. In short, the overall cost of ultrasonic testing is very high.

[0003] In addition, the common shortcomings of the above-mentioned methods are that the detection is carried out after the pile foundation concrete is poured (after the concrete is cured), so if problems are found, they are all after the fact, and they cannot be corrected and dealt with immediately, and the losses caused will be relatively large. Big

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