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Free falling type ball-shaped penetrometer with propeller

A free fall, penetration instrument technology, applied in the field of marine engineering, can solve the problems of shallow penetration depth, limited measurement range, inaccurate measurement results, etc.

Active Publication Date: 2018-06-12
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0011] In summary, static pressure penetration penetrometers (CPT, T-bar, Ball-bar) need external loading devices for measurement, and their application in deep sea exploration is limited; in contrast, the measurement of FFP The process is relatively simple, but the force of the free-falling cone penetrometer is more complicated, while the penetration depth of the free-falling spherical penetrometer is relatively shallow due to its relatively low penetration speed and light weight. Limited range and inaccurate measurements

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  • Free falling type ball-shaped penetrometer with propeller
  • Free falling type ball-shaped penetrometer with propeller
  • Free falling type ball-shaped penetrometer with propeller

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Embodiment Construction

[0080] The specific implementation manners of the present invention will be further described below in conjunction with the accompanying drawings and technical solutions.

[0081] Step 1. Install the thruster 3 and the spherical penetrometer 1, connect the two parts through threads, and ensure that the center of gravity of the spherical penetrometer 1 coincides with the axis of the thruster 3, so as to improve the free fall and penetration of the spherical penetrometer 1. The directional stability in the ocean soil process avoids large deflection angles, thereby increasing the penetration speed and penetration depth of the spherical penetrometer 1; connecting the sensor with the data acquisition instrument 3f or the external acquisition instrument 4;

[0082] Step 2. Hang the assembled penetrometer at a predetermined height above the seabed surface by installing the rope 3h, release the recovery rope 3g, let it stand for a period of time until it is stable, turn on the measurem...

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Abstract

The invention belongs to the technical field of ocean engineering and relates to a free falling type ball-shaped penetrometer with a propeller. The free falling type ball-shaped penetrometer with thepropeller does not need any other loading device during measurement and can penetrate into soil of seabed by kinetic energy and gravitational potential energy for measurement, thereby being simple inoperation process. The main measurement unit of the free falling type ball-shaped penetrometer with the propeller is a ball-shaped penetrometer body at the front end, which mainly bears end bearing resistance of soil, dragging resistance and pressure of covering soil during a power penetration process; data collected by an acceleration sensor and a force sensor can be applied to inverting relevantparameters of soil body such as soil body strength and rate effect parameters; the added propeller can effectively the penetrating depth of the free falling type ball-shaped penetrometer and increasethe measurable depth range and meanwhile enhance the directional stability of the free falling type ball-shaped penetrometer during falling and avoid rotation of the free falling type ball-shaped penetrometer. By adding the force sensor and combining the measured value of the acceleration sensor, the free falling type ball-shaped penetrometer can further improve the measurement precision.

Description

technical field [0001] The invention belongs to the technical field of marine engineering, and relates to a free-falling spherical penetrometer with a propeller, which uses the data collected by penetrating the soil into the soil with the propeller attached to it to analyze the soil related parameters. Background technique [0002] The development and utilization of marine space and resources are inseparable from offshore structures, and the long-term positioning of any structure needs to be connected to the seabed to fix it. Therefore, it is necessary to conduct a detailed survey of the geological conditions of the ocean to determine the relevant parameters of the ocean soil. , to provide a basis for project design. The methods currently used to determine the strength and other parameters of marine clay soil include: CPT (cone penetrometer), cross plate shear test, T-bar (T-shaped penetrometer), Ball-bar (spherical penetrometer ) and FFP (Free Fall Penetrometer). [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01N11/12
CPCG01N11/12
Inventor 刘君
Owner DALIAN UNIV OF TECH
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