Patent Publication Number: US-2021178532-A1

Title: Method of dismantling tower-type wind power generation facility

Description:
TECHNICAL FIELD 
     The present invention relates to a method for disassembling a wind power generation facility, in particular, a method for disassembling a tower-type wind power generation facility. 
     BACKGROUND ART 
     In many cases, for example, as disclosed in Patent Literature 1 below, tower-type wind power generation facilities include a wind power generator at the upper end part of a tower body. Moreover, the interior of the tower body is often hollow. In order to pursue the efficiency of wind power generation, tower-type wind power generation facilities of this type are constructed at various sites such as ones on mountains, and off land (ocean) ones. 
     The lives of tower-type wind power generation facilities of this sort are regarded as 20-30 years (service life thereof in Japan is 17 years). Similarly to other power generation facilities, tower-type wind power generation facilities having reached their lives or service life are to be disassembled. In a conventional method for disassembling a tower-type wind power generation facility, scaffolding is set up on the whole periphery outside the tower body similarly to a constructing method in construction thereof, and the wind power generator and the tower body are disassembled using the scaffolding. A crane which is provided on the scaffolding or a movable crane is used when disassembled objects are lowered. 
     PRIOR ART LITERATURE 
     Patent Literature 
     
         
         Patent Literature 1: Japanese Patent Laid-Open No. 2012-102692 
       
    
     SUMMARY OF INVENTION 
     Problems to be solved by the Invention 
     Work to set up huge scaffolding on the whole periphery outside the huge tower body, however, is complicated and forcibly leads to work at a high place for a long time since a tower-type wind power generation facility is generally huge and typically needs work at a windy place. Accordingly, the period of disassembling operation of a tower-type wind power generation facility problematically tends to increase, and consequently, tends to increase costs of the disassembling operation. Moreover, in the first place, an off land wind power generation facility or the like causes a situation difficult in setting up sufficient scaffolding. 
     The present invention is devised in view of the aforementioned problems, and an object thereof is to provide a method for disassembling a tower-type wind power generation facility which method eliminates scaffolding to be set up on the periphery of a tower body and can simplify disassembling operation as a whole and reduce the period of the disassembling operation. 
     Means for Solving the Problems 
     In order to achieve the aforementioned object, a method for disassembling a tower-type wind power generation facility according to claim  1  is a method for disassembling a tower-type wind power generation facility including a tower body having an inner hollow communicating in an up-down direction, and a wind power generator provided at an upper end part of the tower body, the method including: an inner tower building step of building, in the inner hollow of the tower body, an inner tower that penetrates from a region of a lower end part of the tower body to an upper portion of the power generation facility and that a crane apparatus is able to be mounted on; a crane installing step of installing the crane apparatus on the inner tower; a wind power generator disassembling step of disassembling a structure object of the wind power generator at the upper end part of the tower body to lower a resulting disassembled object through an outside of the tower body with the crane apparatus; a working stage installing step of providing, in midterm of or after the steps, a stage for disassembling work on the inner tower; and a tower body disassembling step of disassembling the tower body using the stage sequentially from its upper part to lower a resulting disassembled object through the outside of the tower body with the crane apparatus. 
     According to this configuration, since the crane apparatus can be installed on the inner tower built in the inner hollow of the tower body, the disassembled object of the structure object of the wind power generator at the upper end part of the tower body can be lowered through the outside of the tower body using the crane apparatus, the tower body can be disassembled, after the wind power generator is disassembled, from its inside via the stage provided on the inner tower, and the resulting disassembled object can be lowered through the outside of the tower body using the crane apparatus, huge scaffolding does not need to be set up on the whole periphery outside the huge tower body. Moreover, since lifting and lowering the stage in accordance with the disassembling position of the tower body makes the disassembling work of the tower body easy, this can reduce the period of the disassembling operation of the tower-type wind power generation facility and can simplify the disassembling operation itself, which can consequently reduce costs of the disassembling operation of the tower-type wind power generation facility as a whole. Moreover, even for an off land tower-type wind power generation facility or the like that sufficient scaffolding cannot be set up on the periphery of the tower body, since the inner tower can be built using the inner hollow of the tower body and the power generation facility can be disassembled using the crane apparatus installed on the inner tower, disassembling operation can be securely performed for various tower-type wind power generation facilities. 
     The invention according to claim  2  is the method for disassembling a tower-type wind power generation facility according to claim  1 , wherein the installation of the stage in the working stage installing step is performed such that the stage extends in a horizontal direction on a periphery of the inner tower in the inner hollow of the tower body and is performed such that the stage is able to be lifted and lowered along the inner tower. 
     According to this configuration, the tower body can be disassembled via the stage at various places at the same height, and therefore, by lifting and lowering the stage, the tower body can be disassembled sequentially from its upper part. 
     The invention according to claim  3  is the method for disassembling a tower-type wind power generation facility according to claim  2 , wherein the working stage installing step includes adjusting a height position of the stage by the stage being lifted or lowered so as to meet a disassembling position in the tower body disassembling step. 
     According to this configuration, by increasing and decreasing the height position of the stage so as to meet the disassembling position of the tower body, the tower body can be disassembled via the stage safely and efficiently. 
     The invention according to claim  4  is the method for disassembling a tower-type wind power generation facility according to any one of claims  1  to  3 , including a roof installing step of providing a roof on the inner tower between the crane apparatus and the stage. 
     Since this configuration can afford a shelter from rain (snow) on the stage, the disassembling operation of the tower-type wind power generation facility can be performed even in rainy weather or the like. 
     The invention according to claim  5  is the method for disassembling a tower-type wind power generation facility according to any one of claims  1  to  4 , including, before the inner tower building step, a tower body upper part opening step of opening a wind power generator housing part at an upper end part of the tower body to penetrate in the up-down direction. 
     According to this configuration, by opening the wind power generator housing part which is generally closed and is at the upper end part of the tower body to penetrate in the up-down direction in advance, the inner tower can be built to penetrate the tower body to the upper portion. 
     The invention according to claim  6  is the method for disassembling a tower-type wind power generation facility according to any one of claims  1  to  5 , including, before the inner tower building step, an opening part forming step of forming an opening part for carrying a facility in in a lower end part of the tower body. 
     According to this configuration, by carrying inner tower members and the crane apparatus in through the opening part for carrying a facility in, the inner tower can be easily built in the tower body and the crane apparatus can be easily installed (moved) onto the upper part of the inner tower. 
     The invention according to claim  7  is the method for disassembling a tower-type wind power generation facility according to any one of claims  1  to  6 , wherein the inner tower building step and the crane installing step are performed using a mast climbing-type crane apparatus that climbs and descends the inner tower along the same while building the inner tower. 
     According to this configuration, the inner tower can be easily and securely built in the tower body and the crane apparatus can be easily and securely installed onto the upper part of the inner tower. 
     Effects of Invention 
     According to the present invention as described above, since the crane apparatus can be installed on the inner tower built in the inner hollow of the tower body, the disassembled object of the structure object of the wind power generator at the upper end part of the tower body can be lowered through the outside of the tower body using the crane apparatus, the tower body can be disassembled, after the wind power generator is disassembled, from its inside via the stage provided on the inner tower, and the resulting disassembled object can be lowered through the outside of the tower body using the crane apparatus, huge scaffolding does not need to be set up on the whole periphery outside the huge tower body. Moreover, since lifting and lowering the stage in accordance with the disassembling position of the tower body makes the disassembling work of the tower body easy, this can reduce the period of the disassembling operation of the tower-type wind power generation facility and can simplify the disassembling operation itself, which can consequently reduce costs of the disassembling operation of the tower-type wind power generation facility as a whole. Furthermore, since the tower body is disassembled from the inside, wind scarcely affects the disassembling work. Moreover, even for an off land tower-type wind power generation facility or the like that sufficient scaffolding cannot be set up on the periphery of the tower body, since the inner tower can be built using the inner hollow of the tower body and the power generation facility can be disassembled using the crane apparatus installed on the inner tower, disassembling operation can be securely performed for various tower-type wind power generation facilities. 
    
    
     
       BRIEF DESCRIPTION OF DRAWINGS 
         FIG. 1  is a partially sectional elevational view showing a schematic configuration of an embodiment of a tower-type wind power generation facility which is to be disassembled by a method for disassembling a tower-type wind power generation facility of the present invention. 
         FIG. 2  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
         FIG. 3  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
         FIG. 4  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
         FIG. 5  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
         FIG. 6  is a detailed explanatory diagram of a stage in  FIG. 5   
         FIG. 7  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
         FIG. 8  is an explanatory diagram of the method for disassembling a tower-type wind power generation facility in  FIG. 1 . 
     
    
    
     MODE FOR CARRYING OUT THE INVENTION 
     An embodiment of a method for disassembling a tower-type wind power generation facility of the present invention is hereafter described in detail with reference to the drawings.  FIG. 1  is a partially sectional elevational view showing a state before disassembling a tower-type wind power generation facility  10  which is to be disassembled by this disassembling method of an embodiment. Similarly to an existing tower-type wind power generation facility, this tower-type wind power generation facility  10  includes a wind power generator  14  at an upper end part of a tower body  12 , and in general, has a hollow  12   a  inside the tower body  12  (refer to  FIG. 6 ). Not-shown spiral staircase, ladder and/or the like are provided in this inner hollow  12   a  of the tower body  12 , for example, such that a person who maintains and inspects the wind power generator  14  can climb those. The height and the size of the tower body  12  vary, for example, depending on a site where the wind power generation facility is constructed, the height of the tower body  12  is occasionally 60 m or more for a ground wind power generation facility and 100 m or more for an off land (ocean) wind power generation facility, the outer diameter of the tower body  12  is 4 m or more at the lower end part thereof, and the diameter of the inner hollow  12   a  is 3 m or more at the top part of the tower body  12 . 
     A rotor  16  and a nacelle  18  are provided at the top part of the tower body  12 . The rotor  16  is a rotor of the wind power generator  14 , and the nacelle  18  is a housing part (casing) housing main devices of the wind power generator  14 . The rotor  16  is configured to include blades  20  constituting blades of a windmill, a hub  24  for connecting the blades  20  to a main shaft  22 , and the like, and the hub  24  is covered by a rotor cover  26 . In the nacelle  18 , a transmission  28  which primarily increases the rotational speed of the main shaft  22 , a generator  30  which generates electric power from the rotary shaft thus accelerated, and the like are housed. Moreover, a not-shown yaw adjusting apparatus which adjusts the orientation of the rotor  16 , in other words, the yaw axis thereof by means of the whole nacelle  18 , and the like are provided at the lower part of the nacelle  18 . Moreover, a not-shown transformation apparatus which converts the electric power generated by the generator  30  into electric power suitable for a system, and the like are also arranged in the lower part of the tower body  12 . 
     Since as mentioned above, the life of a tower-type wind power generation facility is 20-30 years and the service life thereof in Japan is 17 years, a tower-type wind power generation facility having reached its life or service life is to be disassembled.  FIG. 2  shows a state before disassembling work of the tower-type wind power generation facility  10  is performed in this embodiment, and schematically shows the appearance of the tower body  12  and the inner state of the nacelle  18 . In this work as a preparation for substantial disassembling operation, an opening part  32  for carrying facilities in is formed in the lower end part of the tower body  12  (opening part forming step). In the disassembling method of this embodiment, it is needed to carry inner tower members for a tower crane  34 , a crane apparatus  38  itself, a stage  40  which is attached to an inner tower  36  and which persons get on, and the like in the inner hollow  12   a  of the tower body  12 . Although the lower end part of the tower body  12  generally has some opening part (door) where a person can enter, it is difficult to carry such facilities (members for the facility) in therethrough, Therefore, the opening part  32  is formed in the size which can allow the facilities (members for the facility) to be carried in, and the periphery of the opening part  32  is reinforced as needed. 
     Moreover, this preparing work for disassembling opens the nacelle  18  provided at the upper end part of the tower body  12  to penetrate in the up-down direction (tower body upper part opening step). This is to extend the inner tower  36  for the tower crane  34  mentioned later to an upper portion above the tower-type wind power generation facility  10 . Namely, since as mentioned later in detail, disassembled objects are lowered through the outside of the tower body  12  in the method for disassembling a tower-type wind power generation facility of this embodiment, the tower crane  34  needs to penetrate to an upper portion above the tower body  12 , in other words, the upper portion above the tower-type wind power generation facility  10 . Since the interior of the nacelle  18  is typically isolated from the outside, the upper end part of the tower body  12  is closed by the nacelle  18 . Therefore, the nacelle  18  is opened to penetrate in the up-down direction. Since the crane apparatus  38  of mast climbing type as mentioned later is used in this embodiment, the opening parts of the nacelle  18  are set to have the size with which the crane apparatus  38  of this type can pass therethrough. Since as mentioned above, in some cases, the diameter of the inner hollow  12   a  at the top part of the tower body  12  is 3 m or more and the diameter size of the crane apparatus (pedestal portion) mentioned later is less than 3 m, the crane apparatus  38  can be installed at the upper portion above the tower-type wind power generation facility  10  when the crane apparatus  38  can pass through the opening parts of the nacelle  18 . Notably, when facilities inside the nacelle  18  (mainly structure objects of the wind power generator) are obstructive against the penetration through the nacelle  18  in the up-down direction, they are removed or moved. Moreover, in this stage, a spiral staircase, a ladder and/or the like provided in the inner hollow  12   a  of the tower body  12  are removed. 
       FIG. 3  shows an early state of starting disassembling operation, and schematically shows the inner states of both the tower body  12  and the nacelle  18 . In the disassembling operation of this embodiment, first, the inner tower  36  for the tower crane  34  is built in the inner hollow  12   a  of the tower body  12  of the tower-type wind power generation facility  10  (inner tower building step). Various methods are used as a method for building this inner tower  36 , and in this embodiment, the inner tower  36  is built using the tower crane  34  of so-called mast climbing type. As is well known, a mast climbing-type tower crane adds and fixes tower members to its upper portion by the crane apparatus itself to climb the tower (mast), and can also descend the tower of course. Therefore, the crane apparatus  38  of this embodiment has a not-shown lift apparatus including a locking bar which is inserted into the tower, a cylinder for lifting and lowering the crane apparatus  38  with the locking bar being as a support, and the like similarly to a known mast climbing-type crane apparatus. Moreover, also when disassembling the inner tower  36 , the crane apparatus  38  itself lowers inner tower members resulting from the disassembling. The boom of the crane apparatus  38  can be put upright in the vertical direction by releasing its limiter. Notably, for this embodiment, the crane apparatus  38  means an apparatus capable of hoisting a load and lowering the load. 
       FIG. 4  shows a state where the inner tower  36  is built up to the upper portion above the tower-type wind power generation facility  10 , and onto its upper end part, the crane apparatus  38  moves (the crane apparatus  38  is installed), and schematically shows the inner states of both the tower body  12  and the nacelle  18 . After the inner tower  36  is built up to the upper portion above the tower-type wind power generation facility  10 , and onto its upper end part, the crane apparatus  38  is arranged (crane apparatus installing step) as above, structure objects of the wind power generator  14  are disassembled inside the nacelle  18  or through the upper part of the nacelle  18  (wind power generator disassembling step). A tentative stage may be built for disassembling the structure objects of the wind power generator  14 . In this disassembling of the structure objects of the wind power generator  14 , for example, the blades  20  of the rotor  16  are removed from the hub  24 , and then, the hub  24  and the main shaft  22  are removed. These disassembled objects are lowered downward through the outside of the tower body  12  using the crane apparatus  38 . The equipment, of the wind power generator  14 , arranged inside the nacelle  18  is also lowered downward through the outside of the tower body  12  using the crane apparatus  38 . In the final stage, the nacelle  18  remaining is disassembled, and the resulting disassembled objects are lowered downward through the outside of the tower body  12  using the crane apparatus  38 . 
       FIG. 5  shows a state where the disassembling of the structure objects of the wind power generator  14  including the nacelle  18  is completed, and schematically shows the inner state of the tower body  12 . After the disassembling of the wind power generator  14  is completed, it is then needed to disassemble the tower body  12  itself but the inner hollow  12   a  of the tower body  12  does not have a place where a person gets on and works. Therefore, in the method for disassembling a tower-type wind power generation facility of this embodiment, the stage  40  which persons can get on is provided on the inner tower  36  for the tower crane apparatus  34  (working stage installing step). As exemplarily shown in  FIG. 6 , this stage  40  has a circular plate shape spreading in the horizontal direction on the periphery of the inner tower  36 , and is provided below the crane apparatus  38 . A lift apparatus  42  is provided beneath on this stage  40 , for the stage  40  being lifted and lowered along the inner tower  36 . This lift apparatus  42  also has a function of fixing the stage  40  to the inner tower  36  at a desired height. Specifically, it has the similar configuration to that of the lift apparatus of the mast climbing-type tower crane  34 . Notably, the stage  40  may be installed in any stage after building the inner tower  36 , which is not limited to this stage. 
     Moreover, roller apparatuses  44  are provided on the lower surface of this circular plate-shaped stage  40  at the peripheral edge part thereof, for balancing the stage  40  in the inner hollow  12   a  of the tower body  12 . This roller apparatus  44  is configured to include a plurality of rollers  46  which can rotate along the inner wall surface of the tower body  12  in the up-down direction, arms  48  which rotatably support these respective rollers  46  and are coupled onto the lower surface of the stage  40 , and springs  50  which press the rollers  46  onto the inner wall surface of the tower body  12  via the arms  48 . These roller apparatuses  44  are arranged on the peripheral edge part of the lower surface of the circular plate-shaped stage  40  at the same intervals, and each rollers  46  are pressed onto the inner wall surface of the tower body  12  with the springs  50  at equivalent pressing force. Therefore, the stage  40  is stabilized to be well balanced in the inner hollow  12   a  of the tower body  12 . Moreover, such a configuration achieves a structure in which the stage  40  supports the inner tower  36  against the wall surface of the inner hollow  12   a  of the tower body  12 . 
     Moreover, step treads  54  which can be caused to protrude outward in the radial direction of the stage  40  are arranged on the peripheral edge part of the upper surface of this circular plate-shaped stage  40  via hinges  52  at the same intervals in the circumferential direction of the stage  40 . As exemplarily shown in  FIG. 5 , the tower body  12  has a truncated cone shape the lower part of which is thick and the upper part of which is thin, and the inner hollow  12   a  also has a truncated cone-shaped space the lower part of which is wide and the upper part of which is narrow. A reducing rate (expanding rate) of this inner hollow  12   a  in the height direction is about 1 cm in radius per 1 m in height of the tower body  12 . For example, when the height of the tower body  12  is 60 m and the outer diameter of the circular plate-shaped stage  40  is caused to meet the inner diameter of the inner hollow  12   a  at the uppermost part of the tower body  12 , the gap between the peripheral edge part of the stage  40  and the inner wall surface of the tower body  12  expands up to about 60 cm when the stage  40  is lowered to the lowermost part of the tower body  12 . In such a case, the step treads  54  are caused to protrude outward in the radial direction of the stage  40  by the hinges  52  being rotated. Then, persons can get on the step treads  54  to perform disassembling work of the tower body  12 . Notably, the step treads  54  may be configured to slide outward of the stage  40  in the radial direction or employ the similar configuration. 
     Moreover, in this embodiment, as indicated by the two-dot chain line in  FIG. 6 , a roof  56  can be provided on the inner tower  36  above the stage  40  (roof installing step). This roof  56  has a circular plate shape to cover the stage  40 , and is installed inside the tower body  12 . Since providing the roof  56  inside the tower body  12  above the stage  40  as above can afford a shelter from rain (snow), disassembling work of the tower body  12  can be performed even in rainy weather after the nacelle  18  is removed. 
     Since a staircase (ladder) is generally provided on the inner tower  36  built for the tower crane  34  such that persons can climb and descend the same, persons can climb this not-shown staircase (ladder) up to the stage  40 , get on the stage  40 , and disassemble the tower body  12  via the inner hollow  12   a . Disassembled objects resulting from disassembling the tower body  12  can be lowered using the crane apparatus  38  at the upper end part of the inner tower  36 . The tower body  12  is disassembled sequentially from its upper portion, and the disassembled objects are lowered through the outside of the tower body  12  using the crane apparatus  38  at the upper end part of the inner tower  36  (tower body disassembling step). As shown in  FIG. 7 , the stage  40  is lowered stepwise in accordance with disassembling the tower body  12 , the tower body  12  is disassembled at the position (height), the disassembled objects are lowered through the outside of the tower body  12  with the crane apparatus  38 . Moreover, the inner tower  36  may be disassembled from the upper portion in accordance with the disassembling position (height) being lowered, the disassembled inner tower members being lowered with the crane apparatus  38 . 
       FIG. 8  shows a state of the final stage of the essential part in disassembling operation of the tower-type wind power generation facility  10 , and schematically shows the inside of the tower body  12 . As mentioned above, after the tower body  12  is sequentially disassembled from its upper portion, the disassembled objects are lowered with the crane apparatus  38  at the upper end part of the inner tower  36 , and the disassembling position (height) is lowered stepwise, as shown in  FIG. 7 , some disassembled objects of the tower body  12  become able to be lowered without using the crane apparatus. After the tower body  12  is disassembled, and then, after the crane apparatus  38  and the stage  40  are removed, inner tower members at the lower end part of the inner tower  36  are removed to complete the essential part in disassembling operation. 
     As mentioned above, in conventional disassembling operation of a tower-type wind power generation facility, scaffolding is set up on the whole periphery outside the tower body, and the tower body and the like are disassembled using the scaffolding. Setting up the scaffolding on the whole periphery outside the tower body, which is a huge structure with 60 m or more of height, however needs much labor and time due to the huge scaffolding itself even if it is semi-automated. Moreover, since sites where wind power generation facilities are constructed typically have strong wind, this makes it much more difficult to set up scaffolding. Since in the method for disassembling a tower-type wind power generation facility of this embodiment, huge scaffolding does not need to set up on the whole periphery outside the huge tower body  12 , the period of disassembling operation can be reduced and the steps of the disassembling operation can be simplified. Moreover, since the tower body  12  can be disassembled from its inside on the stage  40 , wind scarcely affects the disassembling work. Moreover, since in a conventional method for disassembling a tower-type wind power generation facility, disassembled objects need to be lowered using a crane built on the scaffolding or a movable crane, this leads to extra labor and costs. On the contrary, since in the method for disassembling a tower-type wind power generation facility of this embodiment, disassembled objects can be lowered through the outside of the tower body  12  using the crane apparatus  38  provided at the upper end part of the inner tower  36 , these can reduce the labor and costs of the disassembling operation. 
     Since in the method for disassembling a tower-type wind power generation facility of this embodiment, as above, the tower crane  34  can be built in the inner hollow  12   a  of the tower body  12 , the structure objects of the wind power generator  14  including the nacelle  18  at the upper end part of the tower body  12  can be disassembled, the disassembled objects can be lowered through the outside of the tower body  12  using the crane apparatus  38  of the tower crane  34 , the tower body  12  can be disassembled, after the wind power generator  14  is disassembled, from its inside via the stage  40  provided on the inner tower  36 , and the disassembled objects can be lowered through the outside of the tower body  12  using the crane apparatus  38  of the tower crane  34 , huge scaffolding does not need to be set up on the whole periphery outside the huge tower body  12 . Moreover, since lifting and lowering the stage  40  makes the disassembling work of the tower body dramatically easy, this can reduce the period of the disassembling operation of the tower-type wind power generation facility  10  and can simplify the disassembling operation itself, which can consequently reduce costs of the disassembling operation of the tower-type wind power generation facility  10  as a whole. Moreover, even for an off land tower-type wind power generation facility  10  or the like that sufficient scaffolding cannot be set up on the periphery of the tower body  12  of, disassembling operation can be securely performed using the tower crane  34  built in the inner hollow  12   a.    
     Moreover, by lifting and lowering the stage  40  along the inner tower  36  in accordance with the disassembling position of the tower body  12 , persons on the stage  40  can disassemble the tower body  12  safely and efficiently. 
     Moreover, since the stage  40  spreads in the horizontal direction on the periphery of the inner tower  36  in the inner hollow  12   a  of the tower body  12  and includes a lift facility for the stage  40  being lifted and lowered along the inner tower  36 , persons on the stage  40  can disassemble the tower body  12  at various places at the same height, and therefore, by lifting and lowering this stage  40  with the lift apparatus, the tower body  12  can be disassembled sequentially from its upper portion. 
     Moreover, providing the roof  56  on the inner tower  36  between the crane apparatus  38  and the stage  40  can afford a shelter from rain (snow) onto the stage  40 , and thereby, the disassembling operation of the tower-type wind power generation facility  10  can be performed even in rainy weather or the like. 
     Moreover, by opening the nacelle  18  provided at the upper end part of the tower body  12  to penetrate in the up-down direction prior to building the inner tower  36 , the inner tower  36  can be built to penetrate the tower body  12  to the upper portion. 
     Moreover, by forming the opening part  32  for carrying facilities in in the lower end part of the tower body  12  prior to building the inner tower  36 , the inner tower members and the crane apparatus  38  can be carried in through the opening part  32  for carrying facilities in, and thereby, the inner tower  36  can be easily built in the tower body  12  and the crane apparatus  38  can be easily installed (moved) onto the upper part of the inner tower  36 . 
     Moreover, by employing the mast climbing-type crane apparatus  38  which climbs or descends the inner tower  36  along the same while building or disassembling the inner tower  36 , the inner tower  36  can be easily and securely built in the tower body  12  and the crane apparatus  38  can be easily and securely moved onto the upper part of the inner tower  36 . 
     Notably, while in the aforementioned embodiment, the mast climbing-type crane apparatus  38  is used for the tower crane  34 , for example, the inner tower  36  may be built up to the upper end part, and then, the crane apparatus  38  may be mounted onto the uppermost part. 
     It is needless to say that the present invention includes various embodiments and the like that are not mentioned above. It is accordingly understood that the technical scope of the present invention is defined only by the matters specifying the invention which are cited in the claims and regarded as appropriate based on the description above. 
     REFERENCE SIGNS LIST 
     
         
           10  Tower-type wind power generation facility 
           12  Tower body 
           14  Wind power generator 
           16  Rotor 
           18  Nacelle 
           32  Opening part 
           34  Tower crane 
           36  Inner tower 
           38  Crane apparatus 
           40  Stage 
           42  Lift apparatus 
           56  Roof