Abstract: The invention relates to a construction apparatus having an extendable mast with an upper mast element and a lower mast element, whereby the upper mast element is longitudinally displaceable relative to the lower mast element. The apparatus according to the invention is designed with a linear drive for displacement of the two mast elements relative to each other, whereby the linear drive has an upper drive part which can be actuated in a linear manner relative to a lower drive part of the linear drive, and with a locking device for locking the two mast elements in an extended mast position.

Abstract: The invention relates to a construction machine, in particular a drilling and/or pile driving device, for foundation construction comprising a chassis and a leader arranged on the chassis for the longitudinally displaceable guidance of a drive head. Provision is made for the leader to be pivotable on the chassis by means of a pivot drive about a pivot axis that extends at least approximately parallel to the longitudinal axis of the leader. In accordance with the invention at least one locking element is provided which can be displaced between a first position, in which it fixes the leader around the pivot axis in a rotationally fixed manner on the chassis, and a second position, in which the leader is released. In addition, according to the invention a setting device is provided for the remote-controlled displacement of the locking element.

Abstract: The invention relates to a construction machine, in particular a drilling and/or pile driving device, for foundation construction comprising a chassis and a leader arranged on the chassis for the longitudinally displaceable guidance of a drive head. Provision is made for the leader to be pivotable on the chassis by means of a pivot drive about a pivot axis that extends at least approximately parallel to the longitudinal axis of the leader. In accordance with the invention at least one locking element is provided which can be displaced between a first position, in which it fixes the leader around the pivot axis in a rotationally fixed manner on the chassis, and a second position, in which the leader is released. In addition, according to the invention a setting device is provided for the remote-controlled displacement of the locking element.

Abstract: The invention relates to a telescopable boring rod mechanism with at least two mutually displaceable Kelly rods, which are equipped with means for transmitting a torque to the adjacent Kelly rod. At least one of the Kelly rods is constructed from at least two rod segments, which are made from a different material.

Abstract: The invention relates to a displacement device, particularly for construction machines, having a guide, a carriage, which is displaceably mounted along the guide, and an operating cylinder for displacing the carriage. According to the invention, for increasing the buckling resistance, at least one support element is provided, being displaceably mounted both on the piston rod and on the guide or the carriage and that for preventing lateral buckling of the piston rod, on extending the said piston rod the support element is displaceable up to a predetermined support position on said piston rod.

Abstract: A boring device for producing a bore with a casing tube has a linkage, a boring tool, which can be fixed to the lower end of the linkage, a mounting frame for mounting on the casing tube, a drive and a connecting device, which is used for producing a rotary connection between the casing tube and the mounting frame. The linkage is hollow and has a first and a second flushing line. In the vicinity of the upper end of the link-age are provided a first connection for the supply of a fluid to the first flushing line and a second connection for removing the borings via the second flushing line. A boring method introduced the casing tube into the soil prior to an excavation.

Abstract: The invention relates to a telescopable boring rod mechanism with at least two mutually displaceable Kelly rods, which are equipped with means for transmitting a torque to the adjacent Kelly rod. At least one of the Kelly rods is constructed from at least two rod segments, which are made from a different material.

Abstract: The invention relates to a displacement device, particularly for construction machines, having a guide, a carriage, which is displaceably mounted along the guide, and an operating cylinder for displacing the carriage. According to the invention, for increasing the buckling resistance, at least one support element is provided, being displaceably mounted both on the piston rod and on the guide or the carriage and that for preventing lateral buckling of the piston rod, on extending the said piston rod the support element is displaceable up to a predetermined support position on said piston rod.

Abstract: The invention relates to a boring device and a boring method for producing a bore with a casing tube, which is introduced into the soil prior to an excavation. The boring device has a linkage, a boring tool, which can be fixed to the lower end of the linkage, a mounting frame for mounting on the casing tube, a drive and a connecting device, which is used for producing a rotary connection between the casing tube and the mounting frame. The linkage is hollow and has a first and a second flushing line. In the vicinity of the upper end of the linkage are provided a first connection for the supply of a fluid to the first flushing line and a second connection for removing the borings via the second flushing line.

Abstract: A ground-boring apparatus for boring the ground within a casing tube, which is driven into the ground by a casing tube pusher machine to prevent the surrounding soil from collapsing into a to be formed hole. The soil removed by an extensible kelly bar to be suspended by a movable crane, a boring bucket attached to the lower end of the kelly bar, a supporting frame unit to be placed on the casing tube for holding the kelly bar rotatably about its vertical axis, hydraulic motors provided on the supporting frame unit for turning the kelly bar about its vertical axis, and clamping devices for joining the supporting frame unit and the casing tube.

Abstract: To efficiently bore a hole of a desired diameter regardless of ground conditions of a boring site without the need of an auxiliary crane and thereby curtail processes required for boring operation, a ground-boring apparatus for boring the ground within a casing tube (2), which is driven into the ground by a casing tube pusher machine (3) to prevent the ground from collapsing into a bored hole, and for removing soil from the inside of the bored hole comprises an extensible kelly bar (10) to be suspended by a movable crane, a boring bucket (14) attached to the lower end of the kelly bar (10), a supporting frame unit (11) to be placed on the casing tube (2) for holding the kelly bar (10) rotatably about its vertical axis, hydraulic motors (116) provided on the supporting frame unit (11) for turning the kelly bar (10) about its vertical axis, and clamping devices (114) for joining the supporting frame unit (11) and the casing tube (2) to thereby ensure the rotation of the kelly bar (10) counteracting a reaction f

Abstract: The invention relates to a magazine and manipulation apparatus for drilling rod parts for a drill, having a rod magazine in which the drilling rod parts are received in a multi-layered arrangement in a store, and having a removal device for transferring the individual drilling rod parts from the rod magazine into a charging device which transports the drilling rod part to the drill and for returning the drilling rod parts from the charging device to the rod magazine.

Abstract: A cutter head for retrieving earth samples, in particular for taking underwater samples, has, because of frustum-shaped cutting wheels, an approximately round bore cross section. In an associated boring jig, a tube with a cross section corresponding approximately to the bore cross section is placed above the cutter head. With a regrasping system, the tube can be moved vertically relative to a work table lying on the bore surface. The boring jig may be lowered from a ship to the sea bottom to conduct the boring process.