A low-strain dynamic measuring instrument for pile foundations that can be used in underwater high-pressure environments

Abstract

The invention discloses a pile foundation low strain dynamic tester applicable to an underwater high-pressure environment. A driving hammer and a stress wave receiving probe are integrated in a stress wave generation receiver, and the automation of falling and retraction of the driving hammer is realized simultaneously; the axis of the center of gravity of the stress wave receiving probe is located on the stress wave receiving probe by use of a balancing weight; besides, a gelatinous layer is fitted on the lower end of the stress wave receiving probe by use of a glue so that medium connection between the stress wave receiving probe and a pile at the bottom is realized and the stress wave receiving probe does not need to be pressed manually. The pile foundation low strain dynamic tester applicable to the underwater high-pressure environment is capable of effectively overcoming the influence of the underwater high-pressure environment, and capable of completing the pile foundation low strain testing in the underwater high-pressure environment without the underwater operation of the operating personnel, and therefore, the testing cost is greatly saved; besides, the pile foundation low strain dynamic tester has the advantages of accurate testing and convenience for use.

Description

technical field [0001] The invention relates to the technical field of pile foundation detection, in particular to a pile foundation detection device suitable for underwater high-pressure environments, specifically, a pile foundation low-strain dynamic measuring instrument that can be used for underwater high-pressure environments. 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 integ...

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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