The invention relates to a mast element, in particular a leader element, for a construction machine, with an elongate hollow mast profile which, at a front side, is provided along a mast longitudinal direction with two guide strips through which a linear guide for a mast carriage is formed along the front side. According to the invention, provision is made that at least one guide strip is designed as part of a guide profile on which at least one connection web is formed in one piece with the guide strip, which connection web extends away from the guide strip, and that, in order to form the hollow mast profile, elongate wall elements are provided which, together with the at least one connection web, form the hollow mast profile and enclose an inner cavity of the mast profile.

An in-situ reconstruction and extension structure of an embankment and a construction method thereof are provided. The structure includes a stepped slope excavated on an existing side slope. A gradient of the stepped slope is the same as that of an extension side slope, the stepped slope is individually intersected with top and bottom planes of existing side slope; a toe of existing side slope is taken as a toe of the extension side slope, and gradient of the extension side slope is determined according to positions of the toe and an expanded width. An outer side of stepped slope is filled with a geogrid reinforcement layer in a layered manner, a slope protection structure is arranged on an outer side of the geogrid reinforcement layer to form extension equivalent side slope; a drainage system is arranged at a bottom of the extension side slope.

An in-situ reconstruction and extension structure of an embankment and a construction method thereof are provided. The structure includes a stepped slope excavated on an existing side slope. A gradient of the stepped slope is the same as that of an extension side slope, the stepped slope is individually intersected with top and bottom planes of existing side slope; a toe of existing side slope is taken as a toe of the extension side slope, and gradient of the extension side slope is determined according to positions of the toe and an expanded width. An outer side of stepped slope is filled with a geogrid reinforcement layer in a layered manner, a slope protection structure is arranged on an outer side of the geogrid reinforcement layer to form extension equivalent side slope; a drainage system is arranged at a bottom of the extension side slope.

An assembly for providing an active seismic source includes a motor and a drive shaft coupled to the motor. A crank is coupled to the drive shaft. The motor is configured to impart rotation of the crank in a first rotational direction. A one-way bearing permits rotation of the crank relative to the drive shaft in the first rotational direction and inhibits rotation of the crank relative to the drive shaft in an opposed second rotational direction. The assembly also includes a strike plate, a track, and a hammer that is movable along the track along an axis that extends toward and away from the strike plate. The hammer contacts the strike plate. A biasing element biases the hammer toward the strike plate. A linkage arm couples the hammer to the crank and translates rotational movement of the crank to linear movement of the hammer.

A temporary mechanical and fluidic connection with an anchor wall of a subsea tubular may use a substantially solid, reusable lid for a subsea tubular, which comprises a substantially solid upper surface, a predetermined set of lid anchors (20), a predetermined set of selectively activated valves (30), a seal (40) configured to engage an internal wall (101) of the subsea tubular and create a seal between substantially solid upper surface and the internal wall of the subsea tubular, a connector (50), and a controller (60) by maneuvering the substantially solid, reusable lid proximate an open end (102) of a subsea tubular (100), attaching the substantially solid, reusable lid to the open end of the subsea tubular, using the lid anchors (20) to secure the substantially solid, reusable lid to the open end of the subsea tubular, and operatively engaging the seal (40) to create an occlusive seal between substantially solid upper surface and an internal wall (101) of the subsea tubular.

A temporary mechanical and fluidic connection with an anchor wall of a subsea tubular may use a substantially solid, reusable lid for a subsea tubular, which comprises a substantially solid upper surface, a predetermined set of lid anchors (20), a predetermined set of selectively activated valves (30), a seal (40) configured to engage an internal wall (101) of the subsea tubular and create a seal between substantially solid upper surface and the internal wall of the subsea tubular, a connector (50), and a controller (60) by maneuvering the substantially solid, reusable lid proximate an open end (102) of a subsea tubular (100), attaching the substantially solid, reusable lid to the open end of the subsea tubular, using the lid anchors (20) to secure the substantially solid, reusable lid to the open end of the subsea tubular, and operatively engaging the seal (40) to create an occlusive seal between substantially solid upper surface and an internal wall (101) of the subsea tubular.

A foundation construction machine includes a self-moving/mobile assembly moving the construction machine. An upper structure mechanically connected to the self-moving/mobile assembly has an access point allowing access to the upper structure, and equipped with a walkway surface for standing or walking. A mast/boom mechanically connects to the upper structure, whereon an operating equipment mounts for drilling the ground. A presence sensor integrally mounts to the upper structure to monitor a monitoring region integral with the upper structure and covering the walkway surface. The presence sensor detects presence of a solid body in the monitoring region and sends a detection signal representative of the presence. A control system connected to the presence sensor is configured for receiving the detection signal and for sending a control signal to cause the construction machine to execute a predetermined function(s) when the detection signal indicates presence of a solid body proximate the walkway surface.

A foundation construction machine includes a self-moving/mobile assembly moving the construction machine. An upper structure mechanically connected to the self-moving/mobile assembly has an access point allowing access to the upper structure, and equipped with a walkway surface for standing or walking. A mast/boom mechanically connects to the upper structure, whereon an operating equipment mounts for drilling the ground. A presence sensor integrally mounts to the upper structure to monitor a monitoring region integral with the upper structure and covering the walkway surface. The presence sensor detects presence of a solid body in the monitoring region and sends a detection signal representative of the presence. A control system connected to the presence sensor is configured for receiving the detection signal and for sending a control signal to cause the construction machine to execute a predetermined function(s) when the detection signal indicates presence of a solid body proximate the walkway surface.

A shoring element has a shoring plate and a shaft received within a shaft receiver of the shoring plate. The shoring plate is rotatable and is permitted limited axial movement along the shaft. During installation, rotating the shaft in a first direction drives the shaft into the ground formation and causes the drive collar to contact a drive shoulder of the shoring plate such that the drive collar applies a driving force to the shoring plate. During removal, the shaft is rotated in a second direction to withdraw the shaft from the ground formation and the drive collar to move away from the drive shoulder. Applying an upward force to the lifting points causes the shoring plate to move axially relative to the shaft.

A shoring element has a shoring plate and a shaft received within a shaft receiver of the shoring plate. The shoring plate is rotatable and is permitted limited axial movement along the shaft. During installation, rotating the shaft in a first direction drives the shaft into the ground formation and causes the drive collar to contact a drive shoulder of the shoring plate such that the drive collar applies a driving force to the shoring plate. During removal, the shaft is rotated in a second direction to withdraw the shaft from the ground formation and the drive collar to move away from the drive shoulder. Applying an upward force to the lifting points causes the shoring plate to move axially relative to the shaft.