A drill head for a drilling device for making drill holes in insufficiently stable foundation by displacement of soil material has a base plate, with which the drill pipe end is detachably connected and is closable, on which base plate at least one drill head plate, oriented substantially perpendicular thereto, is placeable. Insertable in the lateral flanks is at least one curved plate, which is provided with first holding means, which are held in second holding means, which are attached on the lateral flanks of the drill head plate. The curved plate is designed in a way and is insertable in the flanks of the drill head plate such that its surfaces are effective as screw faces during the drilling process. The efficiency of the drilling can thereby be improved.

An assembly supports a concrete slab foundation above a ground surface while being poured and hardened. The assembly includes forms, each of the forms having a frame. Lower rollers are mounted to each of the frames for rolling each of the forms onto the ground surface. Upper rollers are mounted to each of the frames at an elevation above the lower rollers. Upper decks are placed on top of the upper rollers. Each of the upper decks has an upper surface configured to receive the concrete while being poured and hardened. The upper rollers of each of the forms are in rolling engagement with a lower side of one of the upper decks, enabling the forms to be rolled out from under the upper decks after the slab foundation has hardened.

An assembly supports a concrete slab foundation above a ground surface while being poured and hardened. The assembly includes forms, each of the forms having a frame. Lower rollers are mounted to each of the frames for rolling each of the forms onto the ground surface. Upper rollers are mounted to each of the frames at an elevation above the lower rollers. Upper decks are placed on top of the upper rollers. Each of the upper decks has an upper surface configured to receive the concrete while being poured and hardened. The upper rollers of each of the forms are in rolling engagement with a lower side of one of the upper decks, enabling the forms to be rolled out from under the upper decks after the slab foundation has hardened.

An excavating pump apparatus and a pile installation apparatus having the same are disclosed. An excavating pump apparatus in accordance with an embodiment of the present invention may include: an excavation head being inserted into an inner space of a pile through an open hole opening the inner space of the pile and being configured to crush seafloor sediments and allow the crushed seafloor sediments to be flowed therein; an outlet conduit connected to the excavation head and being a channel for discharging the seafloor sediments flowed into the excavation head to an outside of the pile; and a pump configured to move the seafloor sediments through the outlet conduit by providing a pump pressure to the outlet conduit.

A post-tensioned tube foundation for supporting a structure subject to high upset forces is described herein. The post-tensioned tube foundation includes an outer CMP, an inner CMP, and a tubular concrete base positioned between the inner CMP and the outer CMP. The outer CMP includes an inner surface that defines a cavity extending between a first open end and an opposite second open end. The outer CMP is positioned within an excavated hole defined along a ground surface. The inner CMP is positioned within the cavity of the outer CMP such that an annular space is defined between the inner CMP and the outer CMP. The tubular concrete base is positioned within the annular space defined between the inner CMP and the outer CMP. A plurality of bracing beams extend radially outwardly from the tubular concrete base.

A post-tensioned tube foundation for supporting a structure subject to high upset forces is described herein. The post-tensioned tube foundation includes an outer CMP, an inner CMP, and a tubular concrete base positioned between the inner CMP and the outer CMP. The outer CMP includes an inner surface that defines a cavity extending between a first open end and an opposite second open end. The outer CMP is positioned within an excavated hole defined along a ground surface. The inner CMP is positioned within the cavity of the outer CMP such that an annular space is defined between the inner CMP and the outer CMP. The tubular concrete base is positioned within the annular space defined between the inner CMP and the outer CMP. A plurality of bracing beams extend radially outwardly from the tubular concrete base.

A dock building apparatus comprises a cantilever arm (11) having a first portion configured to be supported on a ground area and a second portion for overhanging a construction area. The cantilever arm (11) is displaceable perpendicularly to the length of the cantilever arm. The apparatus further includes a lifting device (19) movable along the cantilever arm for bringing construction materials including foundation members from the ground area to the second portion of the cantilever arm, and a foundation building tool (15) movable along the cantilever arm for installing the foundation members in the construction area.

A structural tensioning system for selective coupling to a pier pipe having an elongate threaded rod and a tensioning device. The tensioning device having an elongate body that is configured receive a treaded end of the threaded rod and defines a slot in a distal end portion, a pair of opposed co-axial elongate openings, and a pair of opposed passages that communicate between respective portions of the slot and respective portions of the pair of opposed co-axial elongate openings. A portion of each elongate opening is configured to receive a bolt that is mounted in the pier pipe when the tensioning device is positioned in a tensioning position and portions of the slot, the pair of opposed co-axial elongate openings and the pair of opposed passages are configured to selectively receive the bolt that is mounted in the pier pipe as the tensioning device is moved to the tensioning position.

A structural tensioning system for selective coupling to a pier pipe having an elongate threaded rod and a tensioning device. The tensioning device having an elongate body that is configured receive a treaded end of the threaded rod and defines a slot in a distal end portion, a pair of opposed co-axial elongate openings, and a pair of opposed passages that communicate between respective portions of the slot and respective portions of the pair of opposed co-axial elongate openings. A portion of each elongate opening is configured to receive a bolt that is mounted in the pier pipe when the tensioning device is positioned in a tensioning position and portions of the slot, the pair of opposed co-axial elongate openings and the pair of opposed passages are configured to selectively receive the bolt that is mounted in the pier pipe as the tensioning device is moved to the tensioning position.

A pad site and a method for supporting a rig structure, of which the method includes positioning a plurality of piles in a ground of a core operating section of a pad site, and laying a plurality of mats over the pad site. A first portion of the plurality of mats are at least partially supported by the plurality of piles, and a second portion of the plurality of mats are not supported by the plurality of piles. The first portion of the plurality of mats are configured to support a rig structure.