Underwater low-resistance pile foundation low-strain dynamic monitoring device

Abstract

The invention discloses an underwater low-resistance pile foundation low-strain dynamic monitoring device. A driving hammer and a stress wave receiving probe are integrated into a stress wave generation receiving device, and meanwhile automation of falling and lifting of the driving hammer is achieved; the stress wave generation receiving device is fixed to the top of a pile foundation through the combination of a balancing weight and a fixing device, an adhesive gluing gelatinous layer is arranged at the lower end of the stress wave receiving probe, and water passages are formed between the outer wall of a pushing and pressing chamber and the inner wall of a shell and between the outer wall of the pushing and pressing chamber and the inner wall of a waterproof separating layer respectively to be used for reducing water resistance. The underwater low-resistance pile foundation low-strain dynamic monitoring device has the advantages that the device can be used in deepwater high pressure environments; the driving hammer and the detection probe are combined, so that manual work is saved, and the water resistance is small during knocking through the driving hammer.

Description

technical field [0001] The invention relates to the technical field of pile foundation detection, in particular to a pile foundation detection device in a high water pressure environment, specifically, a low-resistance pile foundation low-strain detection device for underwater use. Background technique [0002] Large-diameter cast-in-situ piles are widely used because of their high bearing capacity and low construction noise. They are usually excavated manually or drilled into holes and poured into piles underground or underwater. The quality is affected by the construction process, especially the concrete pouring. It is difficult to control due to the influence of various factors such as working procedures, so the quality problems of pile foundations generally exist, such as too thick sediment, uneven pile body (local mud, segregation, honeycomb, etc.). Therefore, before proceeding to the next process, the quality and integrity of the concrete body of the pile must be inspe...

AI Technical Summary

Problems solved by technology

However, the existing low-strain dynamic measuring instrument is not suitable for use in deep water. On the one hand, when using the dynamic measuring instrument for detection, two people are generally required to cooperate. One person presses the probe on the pile head, and the other hand The hand hammer or power hammer hits the top of the pile to generate a stress wave, and another person initially judges whether the curve is qualified through the display of the pile detector connected to the probe, and records the corresponding pile number, and then uses special software to further analyze the data; On the other hand, in the deep water high pressure environment, the use of artificial diving for low-strain operations is not only high in labor costs, complicated and difficult to operate, but also the probe of the dynamic tester will seep into the water under the high pressure of deep water, resulting in a decrease in the sensitivity of the probe, and the low-strain curve knocked out Distorted messy, poor results

Expensive labor costs, high difficulty of detection and poor detection effect severely limit the application of low-strain dynamic detectors in marine and river-sea pile foundation detection

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