Pile pipes are widely utilized in various construction projects, from roads and bridges to water treatment facilities. Installed using special pile drivers or impact hammers, the pipes become part of the ground's foundation before remaining held in place by soil pressure. Pipe pilings feature high structural properties, making installation simpler and quicker. Steel is usually the material of choice; however, other forms such as concrete and wood may also be employed for pilings. Fibre Reinforced Polymer (FRP) has become an increasingly popular material. Not only is this material stronger than steel, with much higher tensile strength and no corrosion effects, it is also lightweight making transport and installation much simpler than with traditional materials.
A pile's penetration depends on its capacity to resist lateral loads and on how well its interaction between its helical portion and the soil works together; this interaction is defined by mechanical contact properties which include both normal and tangential behaviour of contacting surfaces. This article seeks to evaluate how position affects bearing capacity of hollow shaft single-plate helical piles by employing failure envelope expressions; comparison is then made between this study's results and those found elsewhere.
Steel hollow pile 11 features a helical projection 13 composed of a round or rectangular rod having an approximate height of 20 mm, attached at an outer circumference end by welding over an approximate length part that is less than 10 times its diameter. Furthermore, an interior screw projection at least twice larger than two times larger diameter can act to increase thrust of inner wall of pile and penetration tests have demonstrated that torque requirements during process can be drastically decreased as a result.
Screwing process also improves penetration speed while shortening time required to reach required design strength, increasing bearing capacity of pile and improving bearing capacity due to effect of screw in pile. To achieve the desired effect, the screw projection in a pile should be fixed at least twice its diameter, with care taken in selecting its shape and size based on penetration performance and workability considerations. Screw projections should also be located in an inaccessible part of the pile so as to minimise internal friction caused by screw projections, thus maintaining optimal penetration performance of the pile. It is recommended to insert it at an angle so as to minimise penetration resistance in maximum.
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