... Abstract In offshore construction, geotechnical risk assessment of pile installation during the preparatory phase is of major importance. Pile driveability analyses are part of these preparations and provide, primarily, insights into the relation between hammer blow count, driving stresses...

... Vibratory hammers typically operate at 1400 RPM (or a frequency of 23 Hz), which means a load cycle of approximately 44 ms.At pile length L and stress wave velocity c the typical stress wave period of a pile T pile equals 2*L/c. This means that since the wave propagation speed in steel...

... models used for the simulations and the capacity estimates are presented to demonstrate that there is no need to drive a pile to its final penetration with an impact hammer to assess its bearing capacity, which when adopted in the industry will greatly reduce pile driving duration and thus cost...

... Abstract The vibratory hammer is one of the tools for the extraction of offshore foundation piles as well as monopiles for the decommissioning of offshore structures. In addition to the standard application, where a pile is driven downward to be installed, a vibratory hammer can also be applied...

... with an underwater impact hammer, or vibratory hammer, and are used for mooring floating structures. This paper presents a methodology to carry out a back analysis of mooring pile capacity based on pile driving data. The process involves two stages, the first is to assess the self-weight penetration of the pile...

... are compared with the actual installation records. The paper will show that while the predictions are not perfect, they forecast the pile driving process realistically. To further enhance prediction capabilities, the paper will suggest that pile driving with vibratory hammers is monitored and that the recorded...

... Abstract Upon recently, most offshore foundations were based on a number of driven piles that were installed with an impact hammer. With the increase in offshore windfarms two major developments have occurred: the shift from jackets to monopiles, leading to increase of the diameter...

... constraints, or noise mitigation to prevent damage of sensitive marine life. installation vessel monopile foundation blue hammer monopile resonance offshore wind hammer strategic planning and management conventional hammer installation foundation design renewable energy sustainable...

... for installation of the monopiles. The monopiles have been installed by means of hydraulic impact hammers with rated energy up to 3000 kJ. The hammers were equipped with a 6.5m diameter pile sleeve as to suit the top of the monopile. Total weight of the hammer assembly was around 580 metric ton. During design...

... annual offshore technology conference ocean energy hammer pile capacity renewable energy foundation sustainable development soil resistance upstream oil & gas resistance proceedings subsea system skin friction wind turbine Presentation of OTC-25960-MS Presentation of OTC-25960-MS...

... Abstract The aim of this paper is to present the methodology currently followed in the offshore industry for the prediction of the pile fatigue induced by pile hammering during installation. A few decades ago piles were thicker, of lower yield stress and hammers were less efficient. Today...

... some of these recent issues that have arisen in practice. Theauthors discuss challenges such as (i) the conservatism of traditional piledesign methods, (ii) the difficulties in sizing hammers for large diameter(>4 m) monopiles and predicting pile driveability, (iii) the difficulty inpredicting set...

... to reproduce in print is restricted to an abstract of not more than 300 words; illustrations may not be copied. The abstract must contain conspicuous acknowledgment of OTC copyright. Abstract This paper presents the requirements that led to the successful implementation of a subsea hydraulic hammer...

... petrobras new conductor installation process casing design hammer subsea system cable torpedo base pressure housing offshore technology conference penetration otc 17197 torpedo anchor procedure casing and cementing conductor anchor upstream oil & gas operation torpedo base assembly...

.... The abstract must contain conspicuous acknowledgment of where and by whom the paper was presented. Abstract Drilling with liquid-driven downhole hammers is a new competitive method for production of boreholes. The system requires large amounts of fluid during operation, which can be difficult and/or expensive...

... island offshore technology conference replenishment beach replenishment penetration probe characteristic otc 13098 video camera pneumatic hammer water depth application prototype system cruickshank characterization sensor hammer system testing Copyright 2001, Offshore...

... system sea bed temporary work deck fpso soft tank installation spar hull subsea system anchor mooring system configuration installation operation derrick barge operation tug upstream oil & gas neptune project hammer center well bay theoretical calculation platform chain hull...

... 325 ft water depth off the southern coast of China. The soils in the area are generally normally consolidated clays intersected by dense sand strata. The measurements assisted the contractor to identi~ hammer problems and improve hammer performance, and assisted the owner in checking pile adequacy...

... of Observed and Predicted Blow Counts Pile drivabtity is evaluated using procedures recommended by Steveu Wiksie, and Turton (1982). Driving system parameters are selected from our data base established from over 200 platform installations worldwide. The data base includes hammer efficiency for 35 different...

.... Such ~OSS overpredictions msutt in the mobilization of larger hammers or thicker pile wall than necessary for pile installation. A simp/e model k proposed to estimate soil resistance to driving. Case histon es of recent deepwater pile installations are presented to illustrate the adequacy of the new...