Disclosed herein is a soil-displacement drill for soil-displacing drilling in a surface in order to form a foundation pile, comprising a drill pipe, a drill head at an end of the drill pipe with several flap leaves which are pivotable between a closed position for closing off the end of the drill pipe and an open position for making this end freely accessible, and one or several closing elements to keep these flap leaves in their closed position and prevent pivoting of the flap leaves which are configured to fail during drilling into the surface in such a way that these closing elements do not impede pivoting of the flap leaves. Additionally, disclosed herein is an assembly of a drill head and one or several closing elements for such a soil-displacement drill, a method for soil-displacing drilling, and a method for converting a soil-displacement drill to form such a soil-displacement drill.

A concentrically loaded foundation pier system which includes several concentrically stacked steel pipes filled with concrete. The entire pier is installed centrally beneath the footing of the structure. Shims are placed between the top-most pier element and a pier cap which prevents shifting when the soil expands and contracts. The final structure is end-loaded and pressed to the bedrock or other load-bearing strata. An alternative embodiment includes a temporary lifting assembly which can be fastened about the structural pier without need for bolts or other fasteners.

Mechanical locking and rotating device also known as twister, consisting of three elements coaxially connected one inside the other, by means of plugs and interpenetrating screws in slots formed on the cylindrical surfaces of the elements, in which a first upper element is used to maneuver the device, a second central element used to rotate the lining tube and a third element deputy to the connection of the end of the lining tube.

The present invention is a grouting method for single pile rock-socketed foundation for offshore wind power, comprising: driving a steel casing into an overburden layer to dig the overburden layer and a rock stratum so as to dig a pile hole; hoisting a steel pipe pile into the steel casing and positioning the steel pipe pile in the pile hole, wherein an annular cavity is formed between the inner walls of the steel pipe pile and the pile hole and the bottom of the steel casing; grouting a first grouting layer to the bottom of a pipe hole of the steel pipe pile; grouting a plurality of grouting layers into the upper end of the first grouting layer in the annular cavity; and pulling out the steel casing, wherein after a grouting solution is aged, the steel pipe pile is stably connected to the overburden layer and the rock stratum.

The invention relates to a pile installation system for providing a pile in the ground, comprising; an elongate pile installation tool for forming a bore hole and having a distal end, an end member for coupling to the distal end of the pile installation tool, and an electromagnetic device for releasable magnetically coupling the end member to the pile installation tool.

Disclosed herein is a soil-displacement drill for soil-displacing drilling in a surface in order to form a foundation pile, comprising a drill pipe, a drill head at an end of the drill pipe with several flap leaves which are pivotable between a closed position for closing off the end of the drill pipe and an open position for making this end freely accessible, and one or several closing elements to keep these flap leaves in their closed position and prevent pivoting of the flap leaves which are configured to fail during drilling into the surface in such a way that these closing elements do not impede pivoting of the flap leaves. Additionally, disclosed herein is an assembly of a drill head and one or several closing elements for such a soil-displacement drill, a method for soil-displacing drilling, and a method for converting a soil-displacement drill to form such a soil-displacement drill.

The present invention is a grouting method for single pile rock-socketed foundation for offshore wind power, comprising: driving a steel casing into an overburden layer to dig the overburden layer and a rock stratum so as to dig a pile hole; hoisting a steel pipe pile into the steel casing and positioning the steel pipe pile in the pile hole, wherein an annular cavity is formed between the inner walls of the steel pipe pile and the pile hole and the bottom of the steel casing; grouting a first grouting layer to the bottom of a pipe hole of the steel pipe pile; grouting a plurality of grouting layers into the upper end of the first grouting layer in the annular cavity; and pulling out the steel casing, wherein after a grouting solution is aged, the steel pipe pile is stably connected to the overburden layer and the rock stratum.

A grouting consolidation method for a full casing borehole guide prefabricated pile, comprising the following steps: S1, driving a drilling rig carrying a casing (1) to perform borehole construction, the borehole construction being performed to a preset hole depth to form a borehole (2); S2. the casing (1) being housed in the borehole (2); S3. implanting a prefabricated pile (4) into the borehole (2) so that the prefabricated pile (4) reaches a hole bottom of the borehole (2); S4. injecting a slurry (3) into the borehole (2); S5. pulling out the casing (1) so that the prefabricated pile (4) and an inner cavity of the borehole (2) are fixed and cemented into an integrated structure. Also provided is a prefabricated pile, comprising a pile body and a grouting channel (5) provided on the pile body, wherein a liquid inlet end (11) of the grouting channel (5) extends out from an upper end surface of the pile body and a liquid outlet end (12) of the grouting channel (5) extends out from a lower end surface of the pile body and/or a side surface of the pile body.

A method of forming a foundation in the ground, comprising the steps of—forming a foot (11) in the ground (100); —forming a column (12) made from a load bearing material in the ground (100) on top of the foot (11); and —forming a pile (13) in the material column (12) such that the pile (13) extends down to the material foot (11) or into the material foot (11).

Soil-displacement drill (1) for soil-displacing drilling in a surface (10) in order to form a foundation pile (2), comprising a drill pipe (3), a drill head (4) at an end of the drill pipe (3) with several flap leaves (5) which are pivotable between a closed position for closing off the end of the drill pipe (3) and an open position for making this end freely accessible and one or several closing elements (6) to keep these flap leaves (5) in their closed position and prevent pivoting of the flap leaves (5) which are configured to fail during drilling into the surface (10) in such a way that these closing elements (6) do not impede pivoting of the flap leaves (5). In addition, the present invention relates to an assembly of a drill head (4) and one or several closing elements (6) for such a soil-displacement drill (1), a method for soil-displacing drilling and a method for converting a soil-displacement drill (1) to form such a soil-displacement drill (1).