- TUBULAR KING PILE FOUNDATION SYSTEM GIKEN WALLAP DRIVER
- TUBULAR KING PILE FOUNDATION SYSTEM GIKEN WALLAP SKIN
The pitch and drive method installs the piles one by one. There are two basic driving methods for sheet pile installation, ‘pitch and drive’ and ‘panel driving’. Some specialist plant is available which may provide more than one method, though generally different rigs will be required. Some ground conditions, particularly layered ground where granular deposits overlie clay deposits (or vice versa) may be best dealt with by a combination of methods. The acceptability of these methods for other reasons, including ground movement and creation of flow paths for contamination will also need to be taken into account.
TUBULAR KING PILE FOUNDATION SYSTEM GIKEN WALLAP SKIN
In particular, the definitions of unfavourable ground for determination of β D and β B consider different driving assistance methods as they influence the skin friction and interlock friction of the installed sheet piles. Soil should only be loosened along the line and not removed when using this technique.īoth methods change the in situ soil properties around the sheet piles and the impact of their use needs to be considered during design. Pre-auguring refers to the use of a continuous flight auger to penetrate the ground along the pile line in advance of the sheet pile installation. Jetting involves delivering a water jet to the soil at the toe of the sheet pile, reducing friction. Jetting and pre-auguring are the main methods.
With older multi-ram presses it was also necessary to bolt plates to each pile, however recent advances have eliminated this requirement.ĭriving assistance methods can significantly improve the constructability of a sheet pile wall. The panel driving/pressing rigs are suited mainly to installation in heavy clays and require a crane to move the rams from pile to pile. The machines are often specific to a particular generic section size, therefore it is important to match pile section to driving method. The Japanese method uses a rig which progresses along the line of piles without needing to be lifted onto each pile individually by crane, which means that access requirements are reduced.
Units have also been developed to adapt leader rigs to use pressing methods. There are two generic types of pressing rig, the ‘Japanese’ rigs, such as those by Giken and Tosa, and panel driving rigs.
This is a low noise and low vibration method, which makes it good for sensitive sites. Pressing methods operate by jacking the piles into the ground, using the adjacent piles for reaction.
TUBULAR KING PILE FOUNDATION SYSTEM GIKEN WALLAP DRIVER
Historically, air hammers and diesel hammers were used, which utilise an explosive force to drive the hammer, however, as the newer hydraulic hammers operate at significantly higher efficiencies and are far less noisy than older diesel hammers, the latter are now less frequently used.Īn oscillating driver is clamped to the top of the pile, to induce vibrations in the pile and reduce friction along the sides of the pile, thus allowing the pile to be inserted into the ground with little extra application of force. The most common form of drop hammer in current use is the hydraulic hammer.
The most common form of impact driving is the drop hammer, which uses a falling weight to create the impact, spread to the top of the pile by a driving cap. There are three driving systems that are applicable to both retaining and bearing piles: