2631results about "Wind motor assembly" patented technology

The invention discloses an old wind power plant fan foundation small-to-large capacity increasing structure and a transformation construction method. The old wind power plant fan foundation small-to-large capacity increasing structure comprises an original fan foundation, a newly-poured reinforced concrete foundation, a vertical anchor bolt cage connecting system and a radial anchor bolt connecting system. The connecting structure of the bottom section of the new fan tower drum and the new fan foundation comprises a vertical anchor bolt cage connecting system and a radial anchor bolt connecting system. The vertical anchor bolt cage connecting system is fixed in the original fan foundation, and the radial anchor bolt connecting system is fixed in the newly-poured reinforced concrete foundation. According to the new fan foundation, the diameter of the middle pier is expanded so as to arrange a new tower tube, the height of the middle pier is not changed, the height of the middle pier of the newly-poured foundation almost does not need to be increased, and the using amount of concrete is greatly reduced. Meanwhile, according to the structure, an original vertical anchor bolt cage connecting system is reserved, a radial anchor bolt connecting system is adopted for enhancing connection between the bottom section of the fresh air fan tower barrel and the fan foundation, the transformation cost and the connection reliability are effectively controlled, and the maximization of reutilization of the original fan foundation and the controllability of the cost of the fresh air fan foundation are achieved.

It is described a vibration damping device (110) for damping, in particular edgewise, vibrations of a wind turbine blade (101) during idling, stand-still, transport or servicing comprising: a removable spoiler (120) removably connectable to the rotor blade (101), in particular rotor blade surface (104), providing aerodynamic resistance, in particular adding drag, in a direction (102) substantially parallel to the average chordwise direction (103) of the rotor blade.

A semi-submersible crane vessel for use in assembling a wind turbine and for installation by means of a crane of the vessel of the assembled wind turbine on a foundation. At an assembly station, the hull of the vessel is provided with a mast-receiving well that is sunk into, or through, the hull, preferably a well that extends into, or through a support column of the hull, which well is configured to receive therein at least a portion of the mast of the wind turbine during an assembly step of the wind turbine. For example, the mast-receiving well has a depth of at least 15 meters, e.g. at least 30 meters, measured from the deck of the deckbox structure.

The invention relates to the technical field of wind power generation, and particularly discloses a duct double-turbine supercharged windmill which comprises a duct and a blade type rotating structure arranged in the duct. The duct sequentially comprises a first contraction section, a first straight section, a second contraction section and a second straight section in the air flow direction, and the diameter of the first straight section is larger than that of the second straight section. The blade type rotating structure comprises a rotating shaft, a first-stage turbine and a second-stage turbine, the first-stage turbine and the second-stage turbine are arranged on the rotating shaft, the first-stage turbine and the second-stage turbine are correspondingly arranged on the first straight section and the second straight section respectively, and the rotating shaft is connected with the generator through a transmission structure. Structural improvement is carried out through the blade type rotating structure and the duct, the turbofan located at the front end drives the turbofan located at the rear end to rotate, and therefore the wind energy utilization rate is increased.

The invention relates to the technical field of path planning, and discloses a mountain wind power equipment transportation path planning and hoisting control method and system. The method comprises the following steps: scanning a mountain road through a laser ranging array to obtain a road cross section database, and modeling to obtain blade scanning envelope data; performing dynamic path planning by adopting a terrain adaptability predictive control algorithm, and obtaining a safe transportation path according to stress constraint verification; the sensor array monitors the blade state in real time and corrects the track; a temperature sensor collects tower drum temperature data, and the size change is predicted through a thermal deformation compensation mechanism; and the positioning system obtains hoisting reference coordinates and controls the hoisting posture in combination with the compensation parameters. The technical problems that dynamic sweeping modeling, stress constraint verification and real-time track correction are lacked in wind power equipment transportation path planning in the mountain environment, and thermal deformation compensation and multi-system collaborative optimization are lacked in hoisting control are solved. And the transportation safety and the hoisting control precision of the mountain wind power equipment are improved.

The invention relates to a single-hook hoisting turnover device for mounting and dismounting a large megawatt wind power impeller, which comprises a main hoisting arm, a transverse swing arm, a driving structure, an impeller upper hoisting seat and an impeller side hoisting seat, a first hoisting point structure is arranged at one end of the transverse swing arm, and a second hoisting point structure is arranged at the other end of the transverse swing arm; a hinge point between the main lifting arm and the transverse swing arm is located between the first lifting point structure and the second lifting point structure, and a connecting point of the first lifting point structure and the impeller upper lifting base and a connecting point of the second lifting point structure and the impeller side lifting base are located on the two sides of an included angle area of the gravity center plumb line of the impeller in the horizontal placing posture and the gravity center plumb line of the impeller in the butt joint posture. Through cooperation of the structures, the purpose that the wind power impeller is hoisted and turned over through a single hook is achieved, compared with a mode of coordinated operation of two cranes, the operation cost and the operation difficulty are reduced, and meanwhile the risk that the cranes and the impeller overturn is also reduced.

The utility model discloses a tower top tool of a wind power mixing tower, which comprises a steel cable, a tower drum, a support and a fixing part, the tower drum is in a hollow cylinder shape, first cable penetrating holes are arranged on the circumferential surface close to the inner wall of the tower drum at equal angles, embedded bolts are arranged on the circumferential surface close to the outer wall of the tower drum at equal angles, and a saddle-shaped connecting block is arranged at the bottom of the support. The support is fixedly connected with the tower drum through the connecting block, the fixing part is arranged in the center of the tower drum and fixedly connected with the tower drum, and a hoisting pulley is arranged in the center of the fixing part.

The invention relates to a motion compensation type pile gripper perpendicularity adjustment control method which comprises the following steps: 1, mounting a tilt angle sensor and a displacement sensor on a pile gripper for detecting the tilt angle theta of a pile body and the position of a supporting arm in real time; step 2, acquiring a current inclination angle value theta c and a target value theta t through a control system, calculating a real-time perpendicularity deviation delta theta = theta c-theta t, and driving a servo mechanism to adjust the position of a supporting arm according to the perpendicularity deviation delta theta so as to perform motion compensation; and step 3, dynamically correcting the compensation process by using a closed-loop control algorithm until the condition that verticality adjustment is completed is met, namely delta theta is less than or equal to epsilon, and epsilon is an allowable error threshold. A high-precision inclination angle sensor and a displacement sensor are installed on the pile gripper, the inclination angle of a pile body and the position deviation of a supporting arm are detected in real time, and a control signal is dynamically generated through a closed-loop control algorithm to drive a servo mechanism to conduct adjustment. A dynamic parameter compensation mechanism is designed, control parameters are corrected in real time according to the inclination angle of the foundation and external force interference, the adjusting precision and stability under the conditions of complex terrains and dynamic external force are remarkably improved, a servo mechanism achieves precise action through a hydraulic driving system and a proportional control valve, the response time of the servo mechanism meets the engineering requirement, and the engineering cost is reduced. And the perpendicularity error of the pile body can be controlled within a preset range, the construction efficiency and the long-term stability are improved, and the problem that a traditional manual adjustment and mechanical auxiliary system is insufficient in precision is solved.

The invention relates to the field of foundations for vertical rods, in particular to a wind generating set foundation anchor bolt installation auxiliary device and an anchor bolt assembly. The auxiliary device comprises a positioning support and an anchor bolt righting assembly, the positioning support comprises stand columns and a cross beam located on the two stand columns, and the anchor bolt righting assembly comprises a guide column in vertical guide fit with the cross beam, holding claws and a lifting elastic device. The telescopic block is provided with upper clamping teeth used for being connected with an upper end thread section of a common anchor bolt in a clamped mode, the holding claws are provided with limiting sliding blocks and are provided with holding elastic devices, and anchor bolt positioning blocks are connected to the lower ends of the holding claws in an inserted mode respectively. The anchor bolt positioning block is provided with an outer peripheral face used for being in positioning fit with an anchor bolt hole of an upper anchor plate and an inner side face used for being in positioning fit with the upper end threaded section, and the anchor bolt positioning block is provided with lower clamping teeth used for being connected with the upper end threaded section of a common anchor bolt in a clamped mode. The problem that a common anchor bolt of an anchor bolt type foundation deflects after being installed on a lower anchor plate is solved.

The invention discloses a wind power assembly type reinforced concrete tower tube assembly construction method, an assembly type reinforced concrete tower tube comprises a concrete tower splicing ring piece, a concrete tower full-circle ring piece and a steel tower conversion section, and the tower tube comprises the spliced ring piece, the full-circle ring piece and the steel tower conversion section from bottom to top; the construction method comprises the process of assembling the fabricated reinforced concrete tower drum through concrete tower piece splicing construction, concrete tower drum and steel tower conversion section hoisting construction and concrete tower drum prestress construction. According to the construction method, assembly and assembly of the concrete tower drum are completed through crawler crane line production, the fan foundation, the concrete tower drum and the steel conversion section are connected through concrete tower drum outer cable unbonded prestress construction, and the construction period is remarkably shortened. In addition, by optimizing the construction process, rapid installation of the prefabricated shell ring is achieved, the construction progress is accelerated, and meanwhile the construction cost is reduced.

A wind turbine installation system and a method for installation of an offshore or onshore wind turbine including a tower is provided. The system includes at least one winch and a winch control system, the winch has a winch motor and a bi-directional rotational spool with a strap, wherein the winch is placed on an installation vessel or on the ground, wherein said the strap is provided with attachment for attachment to a tower, a nacelle or a fundament of the wind turbine and for applying a controlled pull on the tower, nacelle or fundament. A control system is controllably connected to the winch motor for controlling spool rotation in order to induce counter movements to the registered oscillations occurring in the tower and thereby stabilize the tower.

The invention discloses a fan blade transportation and installation system and method and a flight device, and belongs to the technical field of intelligent transportation of fan blades. The system comprises a flight transportation module, an intelligent navigation control module, an installation auxiliary module and a scheduling module; the flight transportation module is used for suspending and loading the fan blades, and suspending, flying and transporting the fan blades according to a preset flight route; the intelligent navigation control module is used for monitoring a flight path, collecting flight data and environment data in a flight process, predicting potential obstacles according to the flight data and the environment data, and optimizing a flight strategy; the mounting auxiliary module is used for aligning and fastening the blades and the fan hub; the scheduling module is used for determining a flight plan according to the meteorological data, the performance of the flight transportation module and the priority of the transportation installation task. By combining a plurality of transportation, installation and dispatching modules, efficient and safe transportation and installation of the fan blades are achieved, and the transportation and installation difficulty and cost are reduced.

In an installation of a wind turbine on a floating foundation in floating condition and subject to sea-state induced motions, e.g. at the site of an offshore windfarm, use is made of a vessel with a crane arranged on the hull and provided with a hoisting system adapted to support the weight of the wind turbine and suspend the wind turbine from the crane. A heave compensation device compensates for sea-state induced heave motion of the wind turbine mast relative to the mast mounting structure of the floating foundation. Use is made of a mast alignment system configured to engage on the suspended wind turbine, e.g. on the mast of the suspended wind turbine, and to bring and maintain the mast of the wind turbine in alignment with the mounting axis of the floating foundation in order to compensate for sea-state induced motions, at least including tilt motions in one or more vertical planes, of the wind turbine mast relative to the mounting axis of the floating foundation.

Wind turbine installation method the installation method including: providing a nacelle (2) at a wind turbine erection site, said nacelle (2) comprising: a main unit (20), arranged to be connected to the wind turbine tower (3), and configured for housing a rotor-supporting assembly of the wind-turbine: at least one auxiliary unit (21, 22) housing an operative component (34) forming part of the power conversion assembly, wherein: the main unit (20) and the auxiliary unit (21, 22) are separate units configured to be connected by a unit fixation structure at an interface, and wherein the operative component (34) is supportable directly on the main unit (20), said method further including: receiving a said main unit (20) and an auxiliary unit (21, 22) and an operative component (34) to said site of erection of the wind turbine, attaching to said main unit (20) the said auxiliary unit (21, 22) and said operative component (34). and attaching a lifting yoke (50) to the main unit (20) and hoisting the main unit (20) together with the auxiliary unit (21, 22) by means of a crane attached to the lifting yoke (50), wherein the auxiliary unit (21, 22) is supported and lifted by the main unit (20) during the hoisting, and installing the main unit (20) and the attached auxiliary unit (21, 22) at the tower top.

The invention relates to the technical field of wind power generation equipment, and discloses a fabricated hollow interlayer concrete-filled steel tube wind power tower drum and an installation method.The fabricated hollow interlayer concrete-filled steel tube wind power tower drum comprises tower drum ring pieces which are sequentially spliced, each layer of tower drum ring piece comprises a pair of drum bodies filled with concrete interlayers, and limiting blocks are fixed to the lower ends of the concrete interlayers; the paired cylinders are connected through transverse prestressed tendons; a concave connector and a convex connector are welded to the upper end and the lower end of the drum body respectively, every two adjacent tower drum ring pieces are connected through a longitudinal prestressed tendon, and the concave connector and the convex connector which are in contact are matched. The device meets the requirements of the ultrahigh wind power tower for structural strength and vibration control. In addition, by means of the prefabricated ring pieces and the internal prestress connection scheme, the transportation and construction difficulty of the tower drum is lowered, and the overall period from production to service is shortened.

A tower for a wind turbine extending axially along a longitudinal axis of the wind turbine includes a rail attached to an external surface of the tower, the rail providing a guide to which a service trolley is attachable in order to be movable along the rail. The tower includes: a plurality of axially adjacent tower segments, each tower segment extending axially between two axial ends, a respective flange being provided at one or both of the axial ends for connecting the respective tower segment to another tower segment. The rail is provided at the flange.

An installation method for an offshore wind turbine, comprising: providing a docking device (100), and movably fixing the docking device to a floating foundation (200), the docking device comprising an annular body (10) and a docking cavity penetrating therethrough; connecting a compensation device (300) to a hoisting appliance (400), the hoisting appliance being connected to a hoisted object by means of the compensation device; using the hoisting appliance to hoist a support tower (500), and inserting the support tower into the docking cavity and connecting same to the floating foundation (200); moving the docking device to the end of the support tower away from the floating foundation in the axial direction of the support tower and movably fixing same to the outer wall of the support tower; and using the compensation device to hoist a power generation assembly, the power generation assembly comprising a rotor, a nacelle (700) and a connection tower (800) connected to the nacelle, and inserting the connection tower into the docking cavity and connecting same to the support tower. The method improves the capability of installing offshore wind turbines and reduces installation costs.

The invention discloses an assembly type segmented prestressed concrete tower drum structure and a construction method, the assembly type segmented prestressed concrete tower drum structure comprises a drum body formed by splicing a plurality of concrete drum sections in a segmented mode in the height direction, the diameter of the concrete drum sections is reduced in the height direction of the drum body, and the concrete drum sections are formed by splicing a plurality of prefabricated pipe pieces into a whole through bent bolts. The fabricated prestressed concrete structure is adopted, and the bearing capacity, rigidity and crack resistance of the tower drum are remarkably improved. The segmented prestress can change the prestress value gradient of the tower barrels with different heights, the performance design of the tower barrels is achieved to meet the requirements of different scenes, and the fatigue life and the service cycle of the tower barrels are prolonged. Prefabricated pipe pieces are produced in a factory in a standardized mode, prestress is tensioned, on-site overall prestress tensioning is avoided, the construction efficiency and the construction quality are improved, only embedded bolt connection needs to be completed on site, construction is convenient and fast, connection is reliable, and wide application prospects are achieved.

The utility model relates to the technical field of wind power test field installation, and discloses a wind power test field-based tower drum installation switching device, which comprises a switching mechanism, the switching mechanism comprises a switching drum body, a first connecting flange is fixedly welded at an opening at the upper end of the switching drum body, and a second connecting flange is fixedly welded at an opening at the lower end of the switching drum body. According to the tower drum installation switching device, the switching drum body of the tower drum installation switching device is designed to be of an integrated structure and comprises the whole drum body, the interior and the exterior of the whole switching drum body are kept flat, the sealing performance is good, meanwhile, the inner reinforcing mechanism attached to the inner wall of the switching drum body is arranged on the inner side of the switching drum body, and the structure reinforcing effect of the switching drum body is achieved; the structure of the adapter barrel is reliable, long-time reliable use of the adapter barrel is further guaranteed, regular repair welding or additional welding maintenance is not needed, and the adapter barrel is convenient to use.

The invention discloses a modular splicing type wind power tower drum, and relates to the technical field of wind power engines, the modular splicing type wind power tower drum comprises a first tower drum and an automatic splicing assembly, a first flange is arranged on the outer wall of the top of the first tower drum, the automatic splicing assembly is fixed on the outer wall of a second tower drum, and a rotating sleeve is fixed at the end part of a blade. According to the modular splicing type wind power tower drum, oil flows in the annular channel to push the gear ring to be meshed with the nut gear to rotate, so that the nut body is in threaded connection along the surface of the fastening bolt in the descending process, and after the fastening bolt completely descends, the oil stops flowing to form resistance on the two sides of the blades; the nut body cannot rotate at will through the bearing, it is guaranteed that the first tower drum and the second tower drum are firmly spliced through the fastening bolts, fastening of all the fastening bolts can be achieved at a time, workers do not need to work high above the ground, assembly time is greatly shortened, and therefore the assembly efficiency of the tower drums is improved.

A method for constructing a wind turbine concrete floater including a central connector from which radial arms extend, the central connector carrying a central stability tower, and each arm carrying an outer stability tower. The method includes prefabricating the arms, central connector and at least parts of the stability towers, pre-assembling the central connector with one arm to form a primary pre-assembly, mounting temporary flotation devices onto the arms to provide additional buoyancy to them, floating the primary preassembly and floating the other arms of the floater, and assembling offshore said primary preassembly with said other arms.

The invention discloses a connector of a wind power concrete tower drum, a tower drum section and a tower drum construction method, the connector comprises a tower drum inner bottom flange and a lower turnup pipe drum, the lower turnup pipe drum is coaxially welded and fixed on the inner wall of the tower drum inner bottom flange to obtain a ring groove, and the ring groove is filled with ultra-high performance concrete. According to the tower tube sections, the connectors are arranged at the upper end and the lower end of a common concrete pipe, and prestressed tendons penetrate through ultra-high performance concrete of the connectors and the common concrete pipe and are locked through prestressed anchorage devices. The construction method comprises the following steps: 1, prefabricating the inner bottom flange and the lower flanging pipe barrel of the tower barrel in a factory; 2, coaxially welding the inner bottom flange of the tower barrel and the lower flanging pipe barrel; 3, a connector is manufactured, and a common concrete pipe is manufactured; 4, hoisting in place in sequence on site; and 5, the prestressed steel bars penetrate through the tower drum sections and are locked through the prestressed anchorage devices. The method has the technical effects that the bearing capacity of concrete tower drum connection is enhanced, the anti-fatigue performance of the concrete tower drum joint and the overall stability of the tower drum are improved, and the construction cost is low.

An apparatus for assembling a structure, such as a wind turbine or jacket, is disclosed. The apparatus comprises a first erectable structure comprising a first plurality of legs connected by a first connection arrangement. The apparatus comprises a second erectable structure comprising a second plurality of legs connected by a second connection arrangement. The apparatus comprises an elongated structure extending between the first and second erectable structures. The apparatus comprises a lifting arrangement configurable to move a load along the elongated structure between the first and second erectable structures. Methods of deploying the apparatus for assembling a structure and methods of assembling a structure are also disclosed.

A crane vessel for hoisting of an offshore wind turbine or a component thereof, includes a hull having a deck. A crane configured for hoisting of an offshore wind turbine or a component thereof includes a vertical crane structure having a crane structure base fixed to the hull, the crane structure extending from the hull over a height thereof to a top along a vertical axis of the crane structure, a boom, and a slew bearing allowing to revolve the boom, about a slew axis. A main hoisting system includes at least one main hoisting winch, an associated main hoisting cable and a load connector, the main hoisting cable extending from the main hoisting winch to a main hoist cable guide on the boom and then to the load connector. The crane further includes a dynamic behaviour adjustment system that is configured to adjust the dynamic behaviour of the vessel by moving and / or arranging an adjustment mass that is distinct from the offshore wind turbine or component thereof into or in at least one dynamic behaviour adjustment position along the height of the vertical crane structure.

The present application relates to the field of wind power generation technology, and discloses a ducted double turbocharged windmill, which comprises a duct and a blade type rotating structure arranged in the duct. The duct comprises a first contraction section, a first straight section, a second contraction section and a second straight section in sequence along the wind direction, and the diameter of the first straight section is greater than that of the second straight section. The blade type rotating structure comprises a rotating shaft, a primary turbine and a secondary turbine arranged on the rotating shaft, the primary turbine and the secondary turbine are arranged in the first straight section and the second straight section respectively, and the rotating shaft is connected with a generator through a transmission structure. The present application improves the structure of the blade type rotating structure and the duct, and realizes that the turbine fan at the front end drives the turbine fan at the rear end to rotate, so as to improve the wind energy utilization rate.

The invention relates to the technical field of wind power mixed tower construction, in particular to a wind power mixed tower drum prefabricated duct piece on-site assembling and hoisting construction method which comprises the following steps: S1, preparation work: working face transfer, operation personnel, construction machinery, materials, tools and instruments, site leveling and foundation treatment; s2, assembling the mixed tower: assembling an assembling platform, mounting joint bars, assembling ring pieces, grouting a grouting seam, maintaining the grouting seam and mounting inner accessories; s3, hoisting the mixed tower: mounting a hoisting tool, working before hoisting a first section, trial hoisting of the first section, grouting a foundation, measuring a reference center, hoisting pipe joints of M02 and above, trial falling of pipe pieces, seating of the pipe pieces, scraping and seam beautifying, grounding connection, mounting a crawling ladder system, lifting a temporary platform, passing through a ball, mounting a steel conversion section, centering a tower drum, mounting a permanent platform, and performing special acceptance inspection and transfer; and tensioning and grouting the pre-stressed anchor cable. By the adoption of the method, the duct pieces can be conveniently transported and rapidly assembled, and the manufacturing cost and the use and maintenance cost are low.

A self-climbing tower crane includes a crane base configured to be placed on a support at a hoisting site, tower segments to erect a crane tower, a crane tower lifting unit mounted on the crane base, and a slewable jib unit. The tower crane is configured to, with the slewable jib unit connected to an upper tower segment, erect the crane tower by stacking tower segments onto one another from below to lengthen the crane tower under the slewable jib unit. The crane tower includes an upper section to be composed of a series of multiple upper tower segments and a lower section to be composed of a series of multiple lower tower segments. Each upper tower segment is embodied as a tubular girder type tower segment. Each lower tower segment is embodied as a latticed structure type tower segment. The tower crane further includes an upper stabilizer device and a lower stabilizer device, each configured to horizontally connect the upper section of the crane tower to an external tall structure, e.g. a wind turbine mast.

The utility model discloses a blade for wind power generation, and belongs to the technical field of wind power. The blade comprises a first blade section and a second blade section which are independent of each other, a first section is arranged at the tail end of the first blade section, a second section is arranged at the head end of the second blade section, and the first section and the second section are connected in an assembled mode through a mechanical connecting assembly and an inclined glue joint layer. The mechanical connecting assembly comprises a plurality of single connecting structures which are distributed on the upper side, the lower side and the front edge area of the blade section. An included angle of 30 degrees is formed between the fracture surface and the axis of the blade; the distance between the setting position of the section and the root of the blade is 30-35% of the length of the whole blade; local reinforcing skins are laid on the transition area of the blade root and the easily-damaged area at the position 1 / 3 away from the blade tip. According to the utility model, a mixed connection mode can be adopted, the advantages of the two connection modes can be integrated, and the connection strength is ensured while the weight of the segmented blades is reduced.

The utility model discloses an assembly type transition section and a wind power generation tower, the wind power generation tower comprises the assembly type transition section, and the assembly type transition section comprises a main cylinder body, lattice type corner columns and connecting components. The main cylinder body is a cylindrical steel cylinder. The multiple lattice type corner columns are evenly arranged around the central axis of the main cylinder body in the circumferential direction at intervals. The height of the connecting components is smaller than that of the main cylinder body, and each lattice type corner column is connected with the side wall of the main cylinder body through one connecting component. The height of the cross section of the connecting component is gradually reduced from the main cylinder body to the lattice type corner column, and the gradually-reduced structure is convenient to connect with the lattice type corner column. The device has the characteristics of reasonable structural design, high stability, prefabricated construction and simplicity and convenience in installation and operation.

It is described a method of at least partially installing at least one wind turbine at an offshore site (5), the method comprising: loading at least one lower tower portion (3) of a wind turbine onto a vessel, the lower tower portion (3) spanning less than an entire wind turbine tower; transporting the lower tower portion (3) to the offshore site (5); lifting and guiding the lower tower portion (3) such that a lower end (7) approaches a tower connection portion (7) provided at an offshore foundation; connecting the lower tower portion (3) at the lower end (7) with the tower connection portion (8).