| Class / Patent application number | Description | Number of patent applications / Date published |
|---|
| 073784000 | Earth stresses | 13 |
| 20080276716 | Penetration-type pipe strain gauge - A penetration-type pipe strain gauge easily transportable and easily installable in various places at low cost in a short period of time to measure strain produced in a shallow layer of the ground. Strain gauges are attached to the outer peripheral surface of an inner pipe, and a pipe strain gauge body is formed by integrally incorporating the inner pipe in an outer pipe. A boring screw is provided at the forward end of the pipe strain gauge body. A rotary tool mounting part for mounting a tool for rotating the pipe strain gauge body is formed at the rear end of the strain gauge body. The pipe strain gauge body is buried in the shallow layer of the ground by using the rotary tool. | 11-13-2008 |
| 20110214506 | APPARATUS AND METHOD FOR EVALUATING MECHANICAL PROPERTIES OF GEO-MATERIALS - An apparatus and method for evaluating mechanical properties of geo-materials. The apparatus having a first platen and second platen defining a test specimen receiving space there between, a shaft having one end contacting one of the platens, and a rotatable a rotatable cam having at least one lobe extending from a peripheral surface thereof. The cam being positioned relative to the shaft such that the lobe is engagable with the shaft in such a way that a cyclical axial load is applied to a test specimen when the test specimen is positioned in the test specimen receiving space between the first platen and the second platen and the cam is rotated so as to cause the lobe to cyclically apply an axial force to the shaft. | 09-08-2011 |
| 20110259114 | TRIANGULATION OF PAVEMENT DEFLECTIONS USING MORE THAN FOUR SENSORS - Systems and methods are disclosed that provide improved non-destructive testing of pavements and in particular non-destructive testing of pavements using rolling wheel deflectometer systems having more than four sensors. The additional sensors more accurately detect pavement deflections under load by compensating for the influence the load deflection basin can have on sensors beyond those at the wheel load. The sensors should be spaced with equal distances from the rolling weight and can have a distance between adjacent sensors that is greater than the equivalent thickness of the pavement being measured. | 10-27-2011 |
| 20120272743 | Method and Apparatus for Laser-Based Non-Contact Three-Dimensional Borehole Stress Measurement and Pristine Stress Estimation - A method and apparatus for non-destructively determining borehole stress parameters, that measures acoustic velocities in the rock formation. The apparatus or laser ultrasonic apparatus involving an acoustic signal generator and at least one interferometer sensing unit with shared reference is used to perform non-contact measurement. Horizontal and vertical stresses are evaluated in more than three angular directions (sometimes called azimuths) around the axis of the borehole using acoustoelastic principle. The magnitudes and directions of principal pristine stresses in the rock formation are derived from the measurement data by using closed-form solutions. Magnetometer is used to determine the angular direction of the stress measurement. | 11-01-2012 |
| 20130008257 | UNDERWATER WORK DEVICE AND UNDERWATER STRAIN GAUGE DEVICE - To easily change internal pressure of a container according to a change in external pressure. | 01-10-2013 |
| 20130125662 | PSEUDO ROCK AND ANALYSIS SYSTEM USING THE SAME - A pseudo rock includes a housing, a strain sensor, a three-axis acceleration sensor, a vibration generator and a controller. The housing has an average shape and size of rocks. The strain sensor detects a stress acting in positive and negative directions of each axis with respect to three-dimensional coordinates using the center of the housing as the origin. The three-axis acceleration sensor detects acceleration acting in each axis of the three-dimensional coordinates. The vibration generator produces vibration in a specific direction with respect to the three-dimensional coordinates. The controller converts respective detected values of the strain sensor and the three-axis acceleration sensor into vibration pulses of specific patterns and outputting the vibration pulses to the vibration generator. | 05-23-2013 |
| 20130255394 | Stress and Strain Sensing Device - A stress and strain sensing device capable of continuously sensing stress received from bedrock and strain of the bedrock over a long period of time is provided. | 10-03-2013 |
| 20130298689 | PASSIVE ELECTROMAGNETIC WAVE REFLECTOR FOR MEASURING LOCAL STRAIN IN A STRUCTURE ON THE EARTH'S SURFACE - A passive electromagnetic wave reflector for measuring, from a satellite, local strain in a structure located on the Earth's surface, characterized in that it comprises a substantially vertical, relative to the Earth's surface, planar element, the planar element having a rectilinear side making contact with the structure the strain of which is to be measured, said element being aligned with the axis of the Earth's poles, and, fixed to the planar element, a mechanical structure having a first part located on a first side of the planar element and a second part located on a second side of the planar element, opposite the first side, the mechanical structure forming a rectilinear edge that, in combination with the rectilinear side of the planar element, forms a means for holding in position the reflector on the structure the strain of which is to be measured. | 11-14-2013 |
| 20140318262 | METHOD AND SYSTEM FOR MEASURING PORE-FLUID PRESSURE - A method for measuring pore pressure is provided using a rigid piezometer that does not need a filter and can be used to measure pore-water pressures in partially frozen soils. This method also can be used to measure pore pressure in a porous media when the hydraulic conductivity of the porous media is low or there is limited amount of pore-fluid available to transfer the pressures. A piezometer is also provided, including: a tube for hydraulic fluid; first and second valves to control fluid flow in the tube and into a porous medium; and a fitting wherein a pressure sensor is positioned to measure fluid pressure in the hydraulic fluid in the tube and a hydraulic fluid droplet ejected from an end of the tube into the porous medium; and an interface of the hydraulic fluid with the pore-fluid within the porous medium, using the droplet placed into the porous medium. The tube (or part of the tube), valves, fittings, and pressure sensor may be enclosed in a housing. | 10-30-2014 |
| 20150369676 | METHOD AND SYSTEM FOR MEASURING PORE-FLUID PRESSURE - A method for measuring pore pressure is provided using a rigid piezometer that does not need a filter and can be used to measure pore-water pressures in partially frozen soils. This method also can be used to measure pore pressure in a porous media when the hydraulic conductivity of the porous media is low or there is limited amount of pore-fluid available to transfer the pressures. A piezometer is also provided, including: a tube for hydraulic fluid; first and second valves to control fluid flow in the tube and into a porous medium; and a fitting wherein a pressure sensor is positioned to measure fluid pressure in the hydraulic fluid in the tube and a hydraulic fluid droplet ejected from an end of the tube into the porous medium; and an interface of the hydraulic fluid with the pore-fluid within the porous medium, using the droplet placed into the porous medium. The tube (or part of the tube), valves, fittings, and pressure sensor may be enclosed in a housing. | 12-24-2015 |
| 20160047724 | TEST APPARATUS FOR EARLY LANDSLIDE DETECTION FULLY-CONNECTED WITH PORE WATER PRESSURE, SURFACE DISPLACEMENT AND SHEAR SURFACE - Disclosed herein is a test apparatus for early landslide detection fully-connected with pore water pressure, surface displacement and shear surface. The test apparatus calculates a factor of safety of a slope based on variation in pore water pressure, surface displacement and shear surface of a soil mass, and predicts a change in factor of safety, thus making early landslide detection possible. In the test apparatus, while a container of a slider is moved with a soil mass loaded into the container, shear surface and surface displacement environment is provided, and the shear strength and the shear stress of the soil mass can be calculated based on the pore water pressure and the weight of the soil mass. Thereby, the factor of safety of the soil mass can be calculated, and early landslide detection can be realized by using variation of the factor of safety of the slope. | 02-18-2016 |
| 20160076205 | Device and Process for Controlling Compaction Based on Previously Mapped Data - This disclosure provides a system and method for compacting materials, and more specifically, a system and method for proactively varying compaction effort over a mat of materials located at a worksite area responsive to previously mapped data relating to the compaction makeup of that specific worksite area. | 03-17-2016 |
| 20160251819 | METHOD AND APPARATUS FOR TESTING HELICAL PILES | 09-01-2016 |
