The present invention relates to pile driving systems and methods and, in particular, to systems and methods for installing pile structures in permafrost ground.
In construction projects, the need often exists to support a structure relative to a desired location of the ground. Piles may be used to support the structure relative to the ground. In particular, a predetermined type of pile may be driven into the ground at the desired location to a predetermined pile depth. The type of pile and pile depth are typically predetermined based on conditions such as the nature of the structure (e.g., load) to be supported by the pile and the conditions of the ground at and below the desired location.
The term “permafrost” is typically used to refer to ground, including rock or soil, at or below the freezing point of water. While many of the techniques employed when driving piles in conventional (e.g., non-frozen) soil may be used in permafrost, the characteristics of permafrost present a unique set of considerations when a pile is to be driven into permafrost.
The need thus exists for pile driving systems and methods optimized for use in permafrost.
The present invention is a pile system for permafrost comprising a pilot hole, at least one pile, and frozen slurry. The pilot hole is formed to a pilot hole depth. The at least one pile is arranged at least partly within the pilot hole and extending to a pile string depth. The frozen slurry is within the pilot hole and is at least partly around the at least one pile.
The present invention is a method of forming a pile system for permafrost comprising the following steps. A mandrel is displaced to form a pilot hole to a pilot hole depth and to create a slurry at least partly within the pilot hole. The mandrel is removed from the pilot hole. While the slurry is at least partly flowable, at least one pile is arranged at least partly within the pilot hole to a pile string depth. Slurry is allowed to freeze within the pilot hole at least partly around the at least one pile.
The present invention may also be embodied as a method of forming a pile system for permafrost comprising the following steps. A mandrel, a lead pile, and an extension pile are provided. A drive system is operated to rotate the mandrel to form a pilot hole to a pilot hole depth and to create a slurry at least partly within the pilot hole. The mandrel is removed from the pilot hole. While the slurry is at least partly flowable, the drive system is operated to rotate the lead such that the lead pile is arranged at least partly within the pilot hole. The extension pile is connected to the lead pile to form at least part of a pile string. While the slurry is at least partly flowable, the drive system is operated to rotate the extension pile such that the lead pile is arranged within the pile hole and the extension pile is arranged at least partly within the pilot hole. The slurry is allowed to freeze within the pilot hole at least partly around the lead pile and the extension pile.
In
Additionally, an internally threaded trailing threaded portion (not shown) may be formed on the mandrel 30. One or more extension piles 34 may be coupled to the mandrel 30 to allow the mandrel 30 to be driven to a depth greater than its length.
Referring now back to
The mandrel 30 is coupled to the drive system 22 and axially rotated while suspended above the desired location 28 in the ground 26 as shown in
The friction created by the teeth 46 heats up the mandrel 30, and the mandrel 30 in turn heats up the ground 26. Liquids in the heated ground 26 melt, creating a slurry 82 within the pilot hole 80. The teeth 46, the material from which the teeth 46 are made, the diameter of the mandrel 30, and speed at which the mandrel 30 is rotated are all controlled such that melted liquids forming at least part of the slurry 82 heat up and expand such that at least a portion of the slurry 82 flows to the surface. Accordingly, at least a portion of the slurry 82 will typically be forced up the pilot hole 80 and form a pool 84 of the slurry 82 on the ground surface where the mandrel enters the ground 26.
After the mandrel 30 reaches a pilot hole target depth 90 predetermined based on factors such as characteristics of the ground 26 and characteristics of the load (not shown) to be supported by the pile string 70 as shown in
At this point, while the slurry 82 is still melted and at least partly flowable, the lead pile 32 is connected to the drive system 22 and supported above the pilot hole 80 as shown in
Again, while the slurry 82 is still melted and flowable, the extension pile 34 is connected to the drive system 22. The extension pile 34 is supported above the pilot hole 80 as shown in
Accordingly, additional rotation of the pile string 70 will continue to cut into the ground 26 beyond the pilot hole depth 90. When the drill string 70 reaches a target drill string depth 92 that is below the pilot hole depth 90 as shown in
When the pile string 70 is secured in the desired orientation at the desired location 28 as shown in
In this specification, the use of a letter suffix with any reference character does not necessarily indicate that an element generically identified by that reference character is different from an element specifically identified by the reference character with a letter suffix. Accordingly, any reference character used without a letter suffix in the specification may generally refer to the same reference character used with a letter suffix in the drawing.
This application, U.S. patent application Ser. No. 15/372,196 filed Dec. 7, 2016 claims benefit of U.S. Provisional Application Ser. No. 62/266,379 filed Dec. 11, 2015, the contents of which are incorporated herein by reference.
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Number | Date | Country | |
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Number | Date | Country | |
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62266379 | Dec 2015 | US |