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| Number | Title | Issue Date |
| 7600412 | Pseudostatic pile load testing method To obtain data having high reliability required for determining bearing capacity of the pile in a short time and economically, a pseudostatic pile load testing method comprises processes that a drop height of a heavy weight (2) dropped on a pile head of a pil... | 10/13/2009 |
| 7404449 | Pile driving control apparatus and pile driving system A pile driving control apparatus for a pile driving system includes a hydraulic control system that controls a throttle of a pile driving hammer, and thereby controls an impact velocity of the hammer with a pile. A controller provides a control signal to the hydraul... | 07/29/2008 |
| 7353714 | Method and apparatus for automatic load testing using bi-directional testing The subject invention pertains to a method and apparatus for testing the static load-bearing capacity of a pile. In an embodiment, one or more load devices for applying a test load can be disposed within a pile such that a pile element can be above the load device, ... | 04/08/2008 |
| 7156188 | Pile driver with energy monitoring and control circuit A pile driver comprises a hammer for impacting a pile, a velocity sensor for measuring the velocity at impact, and a control system for adjusting the hammer stroke in accordance with the readings from the velocity sensor so that the optimal impact energy is imparted... | 01/02/2007 |
| 7104139 | System and method for load sensing using piezoelectric effect System and method for measuring static load by using a piezoelectric load sensor with a feedback technique to compensate for the signal loss due to charge leakage, and therefore ensures measurement accuracy. The system is integrated with other structure, objects and... | 09/12/2006 |
| 6742381 | Apparatus and method for evaluating damping performance of vibration-damping devices A damping performance evaluation apparatus for damping devices including: a support member detachably supporting a damping device in a state enabling the device to exhibit a damping effect thereof; a hammer member for applying oscillation force to the device caused ... | 06/01/2004 |
| 6618927 | Method for manufacturing a gas sensor A sensing element, disposed in a housing, has a gas contact portion exposed to a measured gas. A protective cover extends from a distal end of the housing so as to surround the gas contact portion of the sensing element. A first metallic cover surrounds s... | 09/16/2003 |
| 6533502 | Wireless apparatus and method for analysis of piles A system for the determination of pile parameters includes at least one structure for measuring pile data. The structure for measuring pile data is disposed within a measurement range from a pile. A wireless transmitter is communicably connected to the st... | 03/18/2003 |
| 6354766 | Methods for forming a short aggregate pier and a product formed from said methods Methods for augmenting the load bearing characteristics of short aggregate piers include preloading matrix soils, adding chemical additives to matrix soils and using mesh reinforcement in matrix soils and in cooperation with the aggregate lifts associated... | 03/12/2002 |
| 6170317 | Arrangement for detecting a need for maintaining a hydraulic breaking apparatus The invention relates to an arrangement for indicating a need for maintaining a hydraulic breaking apparatus, the arrangement comprising means for measuring at least one parameter describing the loading of the apparatus. The invention also comprises an in... | 01/09/2001 |
| 6129487 | Underwater pile driving tool A tool is provided for use in submerged condition for installing anchor or foundation elements such as piles in a ground formation that is submerged under a body of water. A hammer body is fixedly supported in axial alignment with the head of a pile that ... | 10/10/2000 |
| 6098447 | Dynamic force measuring instrument for foundation and casing An attenuation circuit for a pile driving force measurement device is disclosed. The attenuation circuit allows for measurements to be made of the force being applied to a driven pile at a reduced voltage compatible with a voltage sensitive measurement de... | 08/08/2000 |
| 5978749 | Pile installation recording system A pile installation recording system for driven piles and auger cast piles. The recording system records a variety of parameter data received from sensing devices. The parameter data is stored, analyzed, and displayed to provide the operator with accurate... | 11/02/1999 |
| 5648657 | Sensor for measuring a movement characteristic of an object A sensor for measuring a movement characteristic of an object has a housing, an emitter emitting electromagnetic radiation, a detector for receiving electromagnetic radiation, a rod having a graduated scale with a plurality of first regions and second reg... | 07/15/1997 |
| 5581013 | Method and system for obtaining useful foundation information A pile bearing capacity determination system which allows the pile driver operator to determine the bearing capacity of a pile while it is being driven without interrupting the driving operation to perform a dead load test. Force sensors are cast in the p... | 12/03/1996 |
| 5410905 | Meter for comparing impact hammers An apparatus and method of measuring and comparing actual and relative impact forces of an impact machine to determine the operating parameters of the machine wherein the apparatus includes a vessel containing a fluid, a vessel piston which moves into the... | 05/02/1995 |
| 5303162 | System for automatically measuring piling results in a piling operation A system for automatically measuring piling results of a piling operation. The system comprises a pile numbering unit, an operational date setting unit, a reference sinking amount setting unit, an average times of hammering setting unit, a stop signal gen... | 04/12/1994 |
| 4586366 | Method and apparatus for measuring driving resistance and velocity of piles during driving A method and apparatus for measuring the driving resistance and velocity of piles during driving utilizing a strain gage accelerometer mounted on the pile. The accelerometer is constructed of a material having high internal dampening characteristics and i... | 05/06/1986 |
| 4271475 | Apparatus for measuring the fall height of a pile driver ram An apparatus for automatically calculating the fall height of the ram of a pile driver is disclosed. The apparatus includes a device for converting the sound created by each blow of the pile driver ram into an electrical signal, a first circuit for conver... | 06/02/1981 |
| 4174625 | Transducer for determining strain data during piling A transducer is disclosed for placing on top of a pile to indicate the force imposed on the pile by the hammer driving the pile. The transducer includes a body made of a material of a known modulus of elasticity. The body has first and second parallel sur... | 11/20/1979 |
| 4112733 | Device for monitoring absolute velocity of points of driven piles during impact A magnetic core velocity transducer is attached to a metallic base plate by means of non-ferrous support elements. Relative movement of the coil over the core of the velocity transducer, during impact of a driven pile to which the base plate is rigidly at... | 09/12/1978 |
| 4052884 | Method and apparatus for determining strain data during piling Method and apparatus for determining strain data during piling in which a strain gauge transducer mounted to the pile is excited with alternating current signals. The output of the transducer is sensed, amplified and demodulated to produce signals proport... | 10/11/1977 |
| 3946598 | Method and apparatus for determining the dynamic parameters of soil in situ The dynamic parameters of soil in situ are determined by: impacting freely suspended piles and measuring the force applied to and the acceleration of the piles; analyzing the measured information to determine the transfer function (impedance) of the piles... | 03/30/1976 |
| 3931729 | Dynamic force measuring instrument for foundation pile and casing This invention relates to the measurement of the driving force used for pile driving and, more specifically, to the use of coils for sensing magnetostrictive effects within the pile which develop when the pile is struck or driven into the ground.... | 01/13/1976 |
