Testing device for measuring soil resistance in motion process of buried submarine pipeline

A motion process, submarine pipeline technology, applied in soil material testing, material inspection products, etc., can solve the problems of inability to deform freely, affecting the safe operation and use of submarine pipelines, etc., to achieve convenient observation, excellent tensile and flexural performance, Cost-effective effect

Inactive Publication Date: 2013-10-16
TIANJIN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Under the action of large internal and external temperature and pressure differences, the submarine pipeline cannot be freely deformed due to the constraints of the foundation soil, and a large additional stress is generated and gradually accumulated inside the pipeline, which may cause vertical or horizontal deformation of the pipeline. Overall buckling seriously affects the safe operation and use of submarine pipelines

Method used

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  • Testing device for measuring soil resistance in motion process of buried submarine pipeline
  • Testing device for measuring soil resistance in motion process of buried submarine pipeline
  • Testing device for measuring soil resistance in motion process of buried submarine pipeline

Examples

Experimental program
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Effect test

Embodiment approach

[0028] Take the 80mm diameter test pipeline in the sandy soil along the axial, horizontal and axial three directions of soil resistance test process as an example. The test process can be divided into three stages, which are described as follows:

[0029] 1. Test preparation

[0030] The preparations for the resistance test in three directions of sand and soil can be divided into three steps: filling sand and compacting, digging trenches and burying pipes, and connecting test devices and instruments.

[0031] (a) Sand packing compaction. Fill the sand into the test tank in every 10cm layer. After each filling, the sand is compacted with a roller, and the density of the layer is measured by the ring knife method. The density of the sand is controlled at about 50%. Filling is repeated in this way until the predetermined elevation is reached.

[0032] (b) Excavation and pipe laying. The filled sand is excavated to the L-shaped channel of the test tank according to the slope o...

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Abstract

The invention discloses a testing device for measuring soil resistance in a motion process of a buried submarine pipeline. The testing device comprises a test tank for containing silt, a test pipeline which passes through the test tank and can move along the axial, horizontal and vertical directions, and a loading frame of which one side is connected with two ends, which are positioned on the outer side of a test tank body, of the test pipeline, and of which the other side is connected with a driving device through a steel wire rope, wherein resistance-type displacement dial indicators are arranged at two ends of the test pipeline respectively and are connected with the input end of a dynamic data acquisition instrument through a cable; the output end of the dynamic data acquisition instrument is connected with a computer; a tension and pressure sensor connected with the input end of the dynamic data acquisition instrument is arranged on the steel wire rope which is connected with the loading frame and the driving device. According to the device, the motion and change rules of a soil body in the test process can be conveniently observed, and a test process and required test data can be completely and accurately recorded so as to grasp the variation trend of the soil resistance.

Description

technical field [0001] The invention relates to a test device for soil body resistance. In particular, it relates to a test device for measuring the resistance of soil during the movement of buried submarine pipelines. Background technique [0002] Deep-water marine resources are the main growth point of future oil and gas resources. Submarine pipelines have become the most important way to transport fluids such as oil and natural gas due to their characteristics of large transportation volume, rapidity, continuity, economy, stability, safety, reliability, small footprint, low investment, and low cost. [0003] In order to meet the requirements of the production process, the interior of the subsea oil and gas pipeline usually has a relatively high delivery pressure and temperature. As the working water depth increases and the length of the pipeline increases, the delivery pressure and temperature inside the pipeline also increase. Under the action of large internal and ext...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N33/24
Inventor 刘润郭绍曾
Owner TIANJIN UNIV
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