Provided is a construction method for a fully prefabricated multi-story concrete plant, the construction method may achieve full coverage of a hoisting operation of the large beam and column prefabricated components of a floor by employing a single intelligent hoisting robot, an angle change of the track devices, an angle change of a moving device, and a self-lifting device. It is not necessary to arrange a transition track at the turn of the installation route, which saves space and installation cost, and overcomes the disadvantage of high cost caused by the traditional prefabricated construction mode of multi-story concrete plant, which needs to arrange a plurality of large hoisting equipment. It may achieve the mechanization and intelligence of the whole construction process of the fully prefabricated multi-story concrete plant.

Provided is a construction method for a fully prefabricated multi-story concrete plant, the construction method may achieve full coverage of a hoisting operation of the large beam and column prefabricated components of a floor by employing a single intelligent hoisting robot, an angle change of the track devices, an angle change of a moving device, and a self-lifting device. It is not necessary to arrange a transition track at the turn of the installation route, which saves space and installation cost, and overcomes the disadvantage of high cost caused by the traditional prefabricated construction mode of multi-story concrete plant, which needs to arrange a plurality of large hoisting equipment. It may achieve the mechanization and intelligence of the whole construction process of the fully prefabricated multi-story concrete plant.

The present invention is an improved apparatus and method for forming a retractable tower or column. The present invention includes pointed hooks wherein the hooks are attached to each section of a section chain, one in a horizontal direction and one in an off-set manner. The section chains are placed on a take up mechanism in an operable position and then raised utilizing a motor. As the section chains are raised, they are guided by a guide tower, rollers, shims, and gear racks into a position whereby hooks from adjacent sections of the section chains form coupled engagements. The coupled engagement of the hooks of the sections of each adjacent section chains thereby form the column.

A crane assembly for erecting a tower from a plurality of tower sections includes a first telescopic mast connected to a second telescopic mast. A crane is mounted on top of the first telescopic mast. The first telescopic mast is configured to increase in length from a retracted state in a first direction and includes a first clamp assembly that selectively grips portions of the tower. The second telescopic mast is configured to increase in length from a retracted state in a second direction opposite to the first direction and includes a second clamp assembly that selectively grips portions of the tower.

A crane assembly for erecting a tower from a plurality of tower sections includes a first telescopic mast connected to a second telescopic mast. A crane is mounted on top of the first telescopic mast. The first telescopic mast is configured to increase in length from a retracted state in a first direction and includes a first clamp assembly that selectively grips portions of the tower. The second telescopic mast is configured to increase in length from a retracted state in a second direction opposite to the first direction and includes a second clamp assembly that selectively grips portions of the tower.

Self-hoisting crane (1) and method of mounting and operating such crane The self-hoisting crane is adapted to be hoisted from ground to a nacelle (2) or a tower (46) of a wind turbine (3) by operation of a cable winch (9) arranged at ground (10) and is adapted to be operated in its mounted position on the nacelle or on the tower by operation of the same cable winch. The cable extends from a hook block (6), out through a pedestal (4) of the crane, from the nacelle or from the tower and to the cable winch at the ground. The self-hoisting crane is provided with a cable crawler (11) having at least one motor driven traction sheave (12.sub.2) adapted to, during operation of the self-hoisting crane, transfer a pulling force to the cable (8) through friction. The cable crawler is shiftable between an active state (13) in which the traction sheave may transfer a pulling force to the cable and a passive state in which the traction sheave may transfer no pulling force to the cable.

Self-hoisting crane (1) and method of mounting and operating such crane The self-hoisting crane is adapted to be hoisted from ground to a nacelle (2) or a tower (46) of a wind turbine (3) by operation of a cable winch (9) arranged at ground (10) and is adapted to be operated in its mounted position on the nacelle or on the tower by operation of the same cable winch. The cable extends from a hook block (6), out through a pedestal (4) of the crane, from the nacelle or from the tower and to the cable winch at the ground. The self-hoisting crane is provided with a cable crawler (11) having at least one motor driven traction sheave (12.sub.2) adapted to, during operation of the self-hoisting crane, transfer a pulling force to the cable (8) through friction. The cable crawler is shiftable between an active state (13) in which the traction sheave may transfer a pulling force to the cable and a passive state in which the traction sheave may transfer no pulling force to the cable.

Disclosed embodiments provide an accelerated construction technique that is well-suited for concrete steel-reinforced buildings. As construction of a building continues, and new floors are built, cutouts in each floor are formed that are vertically aligned with each other to form a multi-floor channel. A climbing hydraulic piston system is installed in the multi-floor channel. The hydraulic piston system lifts a mobile, slab-based mini crane. The climbing hydraulic piston system elevates the crane to a sufficient height to build the next floor slab. Then the crane is lowered onto the slab to be used for construction activities on that floor. The process can be repeated as needed until the final level of the building is constructed. The climbing hydraulic piston systems is then removed from the channel and lowered to the ground by the crane. The crane is then disassembled and removed via the building freight elevator.

A base assembly configured to support a tower mounted crane on a nacelle of the wind turbine, said tower mounted crane being of the kind comprising a base portion and a boom arm, where the boom arm is arranged rotatably about a vertical axis relative to the base portion during normal operation of the tower mounted crane, said base assembly includes a base structure adapted to be mounted to the nacelle, and a support structure configured to engage with the tower mounted crane and support the tower mounted crane in an upright position. In an engagement of the tower mounted crane with the base assembly, a base portion of the tower mounted crane is attached to the support structure. The support structure is movably coupled to the base structure and is adapted to be displaced linearly relative to the base structure in a direction substantially parallel to a longitudinal axis of the nacelle to arrange the tower mounted crane at a plurality of crane mounting positions relative to the nacelle.

A base assembly configured to support a tower mounted crane on a nacelle of the wind turbine, said tower mounted crane being of the kind comprising a base portion and a boom arm, where the boom arm is arranged rotatably about a vertical axis relative to the base portion during normal operation of the tower mounted crane, said base assembly includes a base structure adapted to be mounted to the nacelle, and a support structure configured to engage with the tower mounted crane and support the tower mounted crane in an upright position. In an engagement of the tower mounted crane with the base assembly, a base portion of the tower mounted crane is attached to the support structure. The support structure is movably coupled to the base structure and is adapted to be displaced linearly relative to the base structure in a direction substantially parallel to a longitudinal axis of the nacelle to arrange the tower mounted crane at a plurality of crane mounting positions relative to the nacelle.