Offshore wind power single pile foundation pile monitoring device

Abstract

The invention discloses an offshore wind power single pile foundation pile monitoring device. The device comprises a single pile and the monitoring device arranged on the single pile, the monitoring device comprises a data collecting device, dynamic inclinometers, a vibration acceleration instrument, inclinometers, a earth pressure gauge and an osmometer, wherein the data collecting device is used for collecting monitoring data and transmitting the monitoring data to an onshore server, the dynamic inclinometers are arranged on the tops of the single pile and a draught fan, the vibration acceleration instrument is arranged on the inner wall of the pile body on the top of the single pile, the multiple inclinometers are arranged on the inner sides of towers at different elevations or the pile foundation in the prevailing wind direction respectively, and the earth pressure gauge and the osmometer are installed in the positions, at different elevations from the sludge surface, of the outer wall of the single pile in a pairing mode in the prevailing wind direction. According to the device, through monitoring of fault hidden troubles such as the stress-strain characteristics of the steel tube pile foundation, the resistance of pile-surrounding soil, the pore water pressure, the vibration acceleration of jacket steel, inclining, flexion, deformity and fracture of the towers, foundation uneven settlement and corrosion of the steel structure, automatic early warning can be conducted when the above hidden troubles happen, so that reliable technical support is provided for safety operation.

Description

technical field [0001] The invention relates to the technical field of offshore wind power foundation piles, in particular to a monitoring device for offshore wind power single pile foundation piles. Background technique [0002] Large-diameter single-pile foundation is an emerging and widely used wind power foundation form in my country's coastal areas, especially in the few wind farms that have been built and used. For important issues such as soil interaction, there is currently no large amount of specific and effective monitoring data for reference. [0003] In this regard, the p-y curve method is often used at home and abroad. This method is in good agreement with the measured results in analyzing the deformation of pile foundations under static loads, but it is quite different from the measured results in terms of dynamic loads. Underestimating the lateral deformation of the pile foundation; secondly, the horizontal bearing capacity of the single pile foundation is usu...

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Problems solved by technology

[0002] Large-diameter single-pile foundation is an emerging and widely used wind power foundation form in my country's coastal areas, especially in the few wind farms that have been built and used. For important issues such as soil interaction, there is currently no large amount of specific and effective monitoring data for reference

[0003] In this regard, the p-y curve method is often used at home and abroad. This method is in good agreement with the measured results in analyzing the deformation of pile foundations under static loads, but it is quite different from the measured results in terms of dynamic loads. Underestimating the lateral deformation of the pile foundation; secondly, the horizontal bearing capacity of the single pile foundation is usually controlled by the horizontal displacement of the pile top, and the p-y curve method specified in the API code is generally used in ocean engineering to calculate the horizontal deformation of the pile foundation. However, the p-y curve in the specification is obtained based on the test data of small-diameter flexible piles with a diameter of less than 2m, and its applicability to large-diameter steel pipe piles needs to be studied; again, the above-mentioned cyclic p-y curves are only based on the test phenomenon on the pile’s work. The properties are described without introducing the mechanical behavior of clay under cyclic loading, which needs to be further improved; again, in the past, most of the researches on the cyclic load-displacement curve of single pile foundation under horizontal cyclic loading with a small number of cycles (10-20 times) have been carried out. For wind power pile foundations, what is more important is the cyclic weakening characteristics of pile foundations under long-term cyclic loads with a relatively large number of cycles.

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