Water area vane shear test platform with bucket truss and installation method

Abstract

The invention discloses a cross-slab shearing test platform in a water area with a bucket-type truss foundation and an installation method, which includes the following parts: a suction base composed of three suction buckets and a fixed frame, and the three vertices of the fixed frame are respectively connected to the The tops of the three suction barrels are fixedly connected; the top of each suction barrel is also equipped with drainage and air holes; the truss module is located above the fixed frame; the duct extends vertically upward from the center of the suction base and is divided into sections by multiple ducts It is formed by series connection of conduit couplings, one of the conduit segments is fixedly connected to the truss module, and the top of the conduit is provided with a platform support; the work platform is fixedly connected to the platform support, and the work platform is provided with a drill pipe inlet. The invention is connected with the negative pressure suction system of the survey ship through the drainage hole on the top of the suction barrel, and implements penetration.

Description

technical field [0001] The invention relates to an offshore geotechnical engineering survey operation platform, which can ensure the normal progress of cross-board shear test items, and specifically belongs to the basic platform for on-site testing of geotechnical properties in water areas. Background technique [0002] The cross plate shear test (VST) is a method that applies torque to the cross plate head inserted into the foundation soil with a specified shape and size, so that the cross plate head is twisted at a constant speed in the soil until the soil is sheared, and the cylinder when rotating is measured. The maximum torque formed on the surface is used to convert the unearthed shear strength, which is equivalent to the undrained shear strength of the natural soil layer at the test depth under in-situ pressure consolidation. The cross-plate shear test does not need to take soil samples, which avoids the data distortion caused by the disturbance of the sample structur...

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Problems solved by technology

However, limited by the length of outriggers, the platform can adapt to shallower water depths, and has lower wind, wave, surge and other capabilities, which cannot meet the normal implementation of cross-board test projects in harsh offshore waters.

[0007] In addition, the PCT international patent application "unconditionally stable floating offshore platform" (PCT / US2011 / 0327262011.04.15) provides a working platform with strong anti-overturning performance for offshore oil development, but the installation process requires more auxiliary facilities to cooperate , the high cost input cannot meet the needs of low-cost cross-board test projects

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