Indicator device (90), for indicating proper alignment of bolt-and-nut holes of two abutting flanges (72,72′) of two tower sections (2,5) of a wind turbine tower structure (1), the indicator device (90) comprising a connector (122) for connecting the indicator device (90) to an inner face (71) of one of the flanges, and a body (100) having a first body end (101) and an opposite second body end (112) closer to the connector (122), the indicator device (90) including a resiliently deformable part (150), a pneumatic system or a hydraulic system allowing for the indicator device (90) to assume a normal configuration wherein the first body end (101) is distant from the connector (122), and a second configuration wherein the first body end (101) is located closer to the connector (122), the resiliently deformable part or pneumatic system or hydraulic system urging the first body end (101) from the second configuration towards the first configuration.

A method for installing a foundation in a ground for supporting a structure thereon, the method comprising the drilling of a main column borehole in the ground along an axis parallel to an axis of a force exerted by a load of the structure, inserting a main column into the main column borehole, drilling at least one anchor borehole at an angle away from the main column, inserting an anchor into each of the at least one anchor borehole, injecting a sealant into each of the at least one anchor borehole, after the sealant is dry securing a base to a top of the main column, securing to the base and placing under tension each anchor inserted into each of the at least one anchor borehole, the tension being such as to counteract radial forces to be induced by the structure to a longitudinal axis of the main column.

A node structure (12, 14) for connecting two or more convergent members (16, 26) of a lattice frame to each other and to one or more other members of the lattice frame. The node structure (12, 14) comprises a pair of opposed spaced-apart faces (30) that are substantially planar and substantially parallel to each other. At least one pair of root formations (32) with respective central longitudinal axes define an interior angle between them, those axes diverging outwardly for alignment with respective members of the lattice frame and converging inwardly between the faces (30). An inner connecting wall (34) between the root formations (32) of the pair connects concave-curved inner edges (36) of the faces and extends in a concave curve around the interior angle to join the root formations (32) of that pair.

A node structure (12, 14) for connecting two or more convergent members (16, 26) of a lattice frame to each other and to one or more other members of the lattice frame. The node structure (12, 14) comprises a pair of opposed spaced-apart faces (30) that are substantially planar and substantially parallel to each other. At least one pair of root formations (32) with respective central longitudinal axes define an interior angle between them, those axes diverging outwardly for alignment with respective members of the lattice frame and converging inwardly between the faces (30). An inner connecting wall (34) between the root formations (32) of the pair connects concave-curved inner edges (36) of the faces and extends in a concave curve around the interior angle to join the root formations (32) of that pair.

Disclosed is a tower lifting device for a rotary blasthole drill, comprising a hydraulic cylinder (5), an extending oil path (7), a retracting oil path (6), a speed control oil path (14) and a proximity switch (3), wherein the extending oil path (7) is connected to a non-rod-end chamber of the hydraulic cylinder (5), and an extension control unit is provided on the extending oil path (7); the retracting oil path (6) is connected to a rod-end chamber of the hydraulic cylinder (5), and a retraction control unit is provided on the retracting oil path (6); the speed control oil path (14) is connected to the retracting oil path (6), the speed control oil path (14) is connected to a speed control valve block (15) in series and the tail end thereof is connected to an oil tank (16); the proximity switch (3) is arranged on a tower supporting frame (2) for controlling the switching on and off of the speed control valve block (15), and when the tower (4) is approximately in a horizontal state, the speed control valve block (15) is on. By using such a tower lifting device in the present invention, the speed at which the tower is laid down to a horizontal state can be conveniently controlled.

The present invention relates to a hybrid wind power tower including: a DSCT structure part having an inner steel tube and an outer steel tube that concentrically stand on a foundation, wherein a space between the inner steel tube and the outer steel tube is filled with concrete; and a steel structure part provided on the DSCT structure part. The hybrid wind power tower having a steel tower and a DSCT tower combined is configured in such a manner that a plastic hinge that is required to bear huge loads is provided with the DSCT tower structure having high strength, and the economical steel tower structure is provided on the plastic hinge, thereby maximizing safety and cost efficiency of a wind power tower.

Expandable light towers suitable for mounting to a mobile unit, and methods for their use. Such an expandable light tower includes a telescoping assembly comprising first and second telescoping units. The second telescoping unit is telescopically received in the first telescoping unit to configure the expandable light tower to have retracted and extended configurations. The light tower further includes a light-mounting assembly mounted to the second telescoping unit and a mounting assembly coupled to the first telescoping unit and adapted to mount the telescoping assembly to a hitch of a mobile unit. The mounting assembly enables the telescoping assembly to pivot about a transverse axis.

A demolishing method utilizes an aggregate stack demolishing scaffold apparatus mounted to an upper part of an aggregate stack including four smoke funnels arranged adjacent to each other. An uneven scaffold including one plate-shaped upper scaffold portion is placed on an upper end of each smoke funnel. A lower scaffold portion is coupled to the upper scaffold portion and located in lower positions in the smoke funnels with the upper scaffold portion being placed on the upper ends of the smoke funnels. A chain block suspends and supports the uneven scaffold from and on an inner wall of each smoke funnel, and adjusts a suspending height. With this configuration, the upper scaffold portion is located on the upper ends of the smoke funnels, and thus there is no possibility of contact between the scaffolds in the smoke funnels causing a worker to lose his balance, thereby improving safety.

A sacrificial polymer pole guide cover for the use of covering one or more pole guide tongs in a pole guide. The pole guide cover has a generally arcuate body presenting a length and that is curved along the length. The pole guide cover further presents a concave interior surface along the length and a convex exterior surface along the length. A channel is formed in at least a portion of the length of the convex exterior surface. The channel is shaped to complementally receive at least a portion of a pole guide tong. The pole guide cover also has a mounting assembly for removably mounting the pole guide cover to the pole guide tong.

A method for erecting a wind turbine tower is disclosed. A tower section (8) comprising a lower flange (9) and an upper flange (10), and a plurality of stud bolts (6) and nuts (7) are provided. The tower section (8) is oriented in an upright position with the lower flange (9) below the upper flange (10), and stud bolts (6) are positioned in bolt holes (12) in the lower flange (9) with nuts (7) arranged on an upper side of the lower flange (9). The tower section (8) is lifted to a mounting position on top of another tower section (13), and a flange combination is formed by aligning the bolt holes (12) formed in the lower flange (9) of the tower section (8) with bolt holes (15) formed in an upper flange (14) of the other tower section (13), while advancing the stud bolts (6) through the bolt holes (12, 15). The invention further provides a socket tool (16) for screwing nuts (7) onto stud bolts (6) in a manner which positions the stud bolts (6) correctly with respect to a flange (9).