JP4888699B2 - Tower construction method - Google Patents

Description

  The present invention relates to a tower construction method using a push-up method.

In recent years, construction of an ultra-high tower of about 600 m is planned as a transmission tower for digital broadcasting.
Conventionally, construction methods using various cranes such as a tower crane and a crawler crane are known as tower construction methods. This construction method is a construction method in which a tower is divided into a plurality of sections, and a steel frame is assembled for each section using a crane. ).

  Conventionally, a push-up method is known as a technique for constructing a dome-shaped building or a tower-shaped building. For example, in the case of a steel tower, this construction method is a construction method in which the top of the steel tower is assembled on the ground, the assembled top is pushed up with a jack or the like, and the steel tower constituent part in the next section is assembled thereunder. According to this method, steel towers can be assembled in order from the top section.

  In recent years, as a method of building a steel tower on the building, a method of raising the steel tower on the building by a push-up method has been proposed. In this construction method, first, a building outdoor peripheral part except for a building indoor peripheral part located below the steel tower is constructed, and a steel tower is assembled on the inner periphery of the cylindrical building outdoor peripheral part. At this time, the steel tower is divided into a plurality of sections and assembled upward from the bottom section. Then, after the building outer peripheral part and the steel tower are assembled, the process of pushing up the steel tower by one or more layers and the process of constructing the building peripheral part in the space vacated below the pushed up steel tower are repeated. . According to this construction method, a steel tower can be built on the building without assembling the steel tower on the building (see, for example, Patent Document 2).

Further, in recent years, as a method of building a steel tower on a building, there is a method of constructing an outdoor periphery of the building in advance, and assembling the steel tower in order from the top section inside the outdoor periphery of the building. In this construction method, first, a building outdoor periphery is constructed, and the top of the steel tower is assembled on the inner periphery of the cylindrical building outdoor periphery. Then, the top of the steel tower is pushed up, and the steel tower component of the next section is assembled in the space vacated below the pushed-up top and joined to the top. Thereafter, the steel tower is assembled by repeatedly performing the above-described step of pushing up the steel tower component together with the top and the step of assembling and joining the steel tower component of the next section. According to this construction method, since the assembly work of the steel tower is performed in the lower layer part, the work at high places can be greatly reduced, and workability and safety can be improved (see, for example, Patent Document 3).
Japanese Patent Laid-Open No. 10-2108 JP-A-10-88861 Japanese Patent No. 3446153

  However, in the construction method using the conventional crane described above, the maximum lift of the existing tower crane is about 300 m. Therefore, in order to build an ultra-high tower with a height of about 600 m, a very large special crane is newly manufactured. There is a problem of having to. In addition, when building a super high tower using a crane, it is necessary to build and weld at an ultra high place, but since the influence of the wind tends to become stronger at a high place, Not only is the workability deteriorated, but there are cases where the building method and welding work have to be stopped by the wind, and the process may be delayed. In addition, when building or welding at an ultra high place, it is necessary to pay considerable attention to ensuring safety, and the scaffolding equipment must be heavily equipped. For this reason, the problem that the expense concerning temporary installation increases arises. Furthermore, considerable care must be taken to ensure safety when the scaffold is installed and dismantled, and it is strongly affected by the wind, as in the construction and welding operations. Furthermore, in the case of a tapered tower, it is considered that the current climbing system of the tower crane cannot climb to the top.

  Moreover, in the above-mentioned conventional push-up construction method, it is necessary to support the steel tower components to be pushed up at two or more points in order to prevent the steel tower top or the steel tower components from being overturned. For this reason, a temporary frame for supporting the steel tower component must be provided around the steel tower component, etc., which requires a large amount of temporary equipment, which takes time for installation and dismantling of the temporary equipment and increases the temporary cost. There's a problem.

  Moreover, in the above-mentioned conventional method of raising the steel tower to the building top by the push-up method, the steel tower is far higher than the building because it is a method of assembling the steel tower in order from the bottom node to the inner periphery of the outdoor building periphery. In such a case, the same problem as the above-described method using a tower crane occurs. Therefore, even if an attempt is made to construct an ultra-high tower with a height of 600m with reference to this construction method, the high-rise part (the part above the base part) must be assembled inside the base part of the tower, so it is very large. However, there is a problem that workability is deteriorated due to the influence of the wind, the work period is delayed, and temporary costs are increased.

  In addition, in the above-mentioned conventional method of assembling the steel tower in order from the top node inside the outer periphery of the building, support is provided at two points, upper and lower, to prevent the steel tower from falling, but to receive these support Temporary equipment such as guide rails must be provided, and there is a problem that it takes time and labor to install and dispose of the temporary equipment, and the temporary cost increases.

  The present invention takes the above-described conventional problems into consideration, can construct an ultra-high tower without using an ultra-large crane, can reduce work at a high place, and pushes It aims at providing the construction method of the tower which can omit the temporary installation for support at the time of up.

According to the first aspect of the present invention, in the method of constructing a tower having a double structure in which an inner frame is formed on the inner side of the outer frame, the outer frame of the base portion of the tower is constructed and the inner side of the outer frame of the base portion After the uppermost tower component constituting the top of the tower is carried in or formed, the uppermost tower component is provided on the outer frame of the base while being supported by the outer frame of the base. The tower component of the next section is carried in or formed below the tower component that has been pushed up by the push-up means and then raised, and the tower component of the next section is joined to the tower component thereon. And the step of pushing up the tower component by the push-up means while supporting the tower component on the outer frame of the base. As a result, the tower components constituting the tower are assembled in order from the upper node, and the tower component of the lowest node arranged immediately above the base is joined to the tower component above it. A tower construction method for constructing an inner frame of the base after being pushed up , wherein the outer frame is removed, and the tower constituent part including only the inner frame is placed inside the outer frame of the base. After carrying in or forming and joining to the tower component of the upper node and raising the tower component to above the base, an external frame is attached to the inner frame of the tower component .

  Due to such a feature, the joining operation of the tower components constituting the tower is performed at a low position. In addition, the tower has a double structure consisting of an outer frame and an inner frame, and only the outer frame of the base is pre-constructed. And when pushing up a tower structure part, the fall of the tower structure part pushed up is aimed at by making it support to the external frame of a base part.

Further , the outer shape of the tower component to be pushed up is reduced by the amount excluding the outer frame, and it is difficult to interfere with the outer frame of the base at the time of push-up.

According to a second aspect of the invention, housed in the tower process construction according to claim 1, when going assembling the tower components, the antenna unit to build the highest portion of the tower in one of the tower structure section In addition, the antenna portion is raised by a push-up method or a lift-up method, and is arranged at the top of the tower.

  Due to such a feature, when the tower constituent part is pushed up, the antenna part is accommodated in the tower constituent part, and the antenna part does not receive wind.

According to a third aspect of the present invention, in the tower construction method according to the first or second aspect, in the step of pushing up the tower component, the tower is provided by a jack mechanism provided on an outer frame of the base. It is characterized by correcting the horizontal position of the component.

  With such a feature, the tower component can be surely arranged at a regular position.

  According to the tower construction method according to the present invention, since the joining operation of the tower components constituting the tower is performed at a low position, an ultra-high tower can be constructed without using an ultra-large crane, and the cost Reduction can be achieved. In addition, since work at a high place can be significantly reduced, workability can be improved, temporary costs can be reduced, work schedule delay can be prevented, and safety can be improved. In addition, because the tower component to be pushed up is supported on the outer frame of the base to prevent the body from falling, there is no need to provide temporary equipment for support, and the time and effort for installing and dismantling the temporary equipment is omitted. And temporary costs can be reduced.

  DESCRIPTION OF EMBODIMENTS Hereinafter, an embodiment of a tower construction method according to the present invention will be described with reference to the drawings.

First, the structure of the tower 1 in this Embodiment is demonstrated.
FIG. 1 is an elevational view showing the tower 1 in the present embodiment, and FIG. 2 is a cross-sectional view showing the tower 1 in the present embodiment.

  As shown in FIG. 1 and FIG. 2, the tower 1 is a triangular pyramid-shaped super high steel tower that tapers upward, such as a digital broadcast transmission tower having a height of about 600 m. is there. This tower 1 has a double structure in which an inner frame 3 assembled in a triangular pyramid shape smaller than the outer frame 2 is formed inside an outer frame 2 assembled in a triangular pyramid shape that becomes an outer peripheral portion of the tower 1. ing. In addition, an antenna unit 4 having an antenna (not shown) is provided at the top of the tower 1. Further, an observation room (observation platform 5) for viewing from the upper part of the tower 1 is provided at the upper part of the tower 1.

Next, the construction method of the tower 1 which consists of an above-described structure is demonstrated.
3 to 7 are elevation views showing the construction status of the tower 1 in the present embodiment.

  First, as shown in FIG. 3, the outer frame 2 of the base portion 1a of the tower 1 is constructed, and the uppermost tower constituting portion 10 constituting the top portion 1b of the tower 1 inside the outer frame 2 of the base portion 1a. The process of assembling is performed. Specifically, the cylindrical outer frame 2 of the tower base 1a is constructed using a crane 6 such as a movable ultra-large crawler crane. At this time, the inner frame 3 of the base portion 1 a is not assembled, and a large space S is formed in the inner peripheral portion of the outer frame 2. On the other hand, in the above-described large space S, the tower component 10 at the top of the triangular pyramid is assembled using the crane 6 as in the case of the external frame 2 described above. At this time, the antenna unit 4 is attached to the uppermost end of the tower constituent unit 10 at the uppermost section. In addition, after constructing the external frame 2 of the tower base 1a, the topmost tower component 10 may be assembled. Alternatively, the topmost tower component 10 may be assembled first, and the tower base 1a later. The external frame 2 may be constructed, or the construction of the external frame 2 of the tower base 1a and the assembly of the uppermost tower component 10 may be performed simultaneously.

  Next, as shown in FIG. 3 and FIG. 4, a step of pushing up and raising the uppermost tower component 10 is performed. Specifically, first, push-up means 7 for pushing up (push-up) the tower component 10 is provided on the outer frame 2 of the tower base 1a. As this push-up means 7, a known push-up means can be used. For example, one end of the cables 7a and 7a is hooked to the lower end portion of the tower constituting portion 10, and large jacks 7b and 7b for pulling the other end of the cables 7a and 7a are attached to the upper portion of the outer frame 2 of the tower base portion 1a. And the tower structure part 10 is raised to predetermined height by pulling up the cables 7a and 7a with the large jacks 7b and 7b.

  Further, when the tower component 10 is pushed up by the push-up means 7, the tower component 10 is raised while being supported on the outer frame 2 of the tower base 1a. Specifically, guide portions 9 that protrude toward the inside of the outer frame 2 are attached to the upper portion of the outer frame 2 of the tower base portion 1a. A plurality of the guide portions 9 are arranged so as to surround the tower constituting portion 10 in the outer frame 2, and the tower constituting portion 10 is held by these guide portions 9. That is, the tower constituent part 10 to be pushed up is supported by the outer frame 2 of the tower base part 1a through these guide parts 9.

  Moreover, the jack mechanism 14 may be provided in the external frame 2 of the tower base 1a described above, and the horizontal position of the tower component 10 to be pushed up may be corrected by the jack mechanism 14. Specifically, the above-described guide portion 9 is provided with a jack mechanism 14 that strokes in the horizontal direction. The tip of the stroke portion of the jack mechanism 14 is in contact with the outer frame 2 of the tower component 10, and by extending the stroke portion of the jack mechanism 14, the outer frame 2 of the tower component 10 is horizontally aligned. The tower component 10 is horizontally moved by being pressed. Thereby, the horizontal position of the tower component 10 is corrected.

  Next, as shown in FIG. 4, below the tower component 10 that has been raised, the tower component 11 in the next section that constitutes the high-rise part 1 c of the tower 1 (the part between the base part 1 a and the top part 1 b). It carries in and performs the process of joining the tower structure part 11 of this next section, and the tower structure part 10 on it. Specifically, the tower component 11 in the next section assembled in a factory or on-site assembly yard is placed on the large carriage 8 and carried into the outer frame 2 (in the large space S) of the tower base 1a. . Then, the carriage 8 is moved to a position immediately below the tower component 10 in the upper section, the tower component 11 in the next section placed on the carriage 8 is aligned with the tower component 10 in the upper section, and the tower in the next section The upper end of the component part 11 and the lower end of the tower component part 10 of the upper node are joined by joining means such as welding. At this time, the tower component 10 at the upper node is in a state of being lifted by the push-up means 7 and is held at a predetermined position by the guide portions 9.

  Next, by repeating the above-described procedure, as shown in FIG. 5, the tower components 11... Constituting the tower 1 are assembled in order from the upper section. Specifically, after the tower component 11 of the next section is joined under the tower component 10 of the uppermost section, the assembled tower is formed in the same manner as the above-described process of pushing up the tower component 10 of the uppermost section. The components 10, 11,... Are pushed up (push-up process). Thereafter, in the same manner as the above-described process of carrying in and joining the tower component 11, the tower component 11 ′ in the next section is further carried in and joined (carry-in joining process). Thereafter, the push-up process described above is performed again, and then the carry-in joining process described above is performed. That is, the above-described push-up process and the tower connecting part carry-in joining process are repeatedly performed to assemble the tower constituent parts 11.

Then, after the plurality of tower components 10, 11,... Are assembled to a predetermined height, a step of forming the observation platform 5 above the outer frame 2 of the tower base 1a is performed. Specifically, when the position X where the observation platform 5 is provided rises to above the outer frame 2 of the tower base 1a, the observation platform 5 is constructed using the crane 6.
After the construction of the observation platform 5 is completed, the above-described push-up process and the carrying-in joining process of the tower components 11... Are repeated again to further assemble the tower components 11.

  4, 5, and 6, the tower constituent parts 11, 12, and so on that constitute the high-rise part 1 c of the tapered tower 1 are each assembled in a trapezoidal cross section. Further, the tower component 10 constituting the top portion 1b of the tower 1 and the tower component 11 constituting the upper layer 1c of the tower 1 are the outer layer of the tower component 11 ... The frame 2 and the internal frame 3 are integrated. On the other hand, of the tower constituent parts 11... 12 constituting the high-rise part 1 c of the tower 1, the tower constituent parts 12 on the lower layer side are composed of only the inner frame 3 excluding the outer frame 2. . That is, at first, the tower constituting part 11 composed of the outer frame 2 and the inner frame 3 is assembled, and the tower constituting part 12 composed only of the inner frame 3 is assembled at a certain node.

  Specifically, as shown in FIG. 4 and FIG. 5, when the tower component 11 is pushed up, the outer frame 2 of the tower component 11 does not interfere with the outer frame 2 of the base portion 1a. The tower component 11 that is carried into the inside of the outer frame 2 of the base portion 1a and joined to the tower component 11 on the base frame 1a has a configuration in which the outer frame 2 and the inner frame 3 for one node are integrated. Yes. On the other hand, as shown in FIG. 6, in the lower side node where the outer frame 2 of the tower component 12 interferes with the outer frame 2 of the base 1a when pushing up the tower components 11,. The tower constituent part 12 which is carried into the inside of the outer frame 2 of 1a and joined to the tower constituent part 12 thereabove is constituted by only the inner frame 3 for one node. As shown in FIG. 7, when pushing up the tower component 12 consisting only of the inner frame 3 in this way, as shown in FIG. The horizontal position can be corrected by the provided jack mechanism 14. That is, the tip of the stroke portion of the jack mechanism 14 is brought into contact with the inner frame 3 of the tower component 12 and the stroke portion of the jack mechanism 14 is extended to correct the horizontal position of the tower component 12.

  As described above, the tower components 11..., 12... Are assembled, and after the tower components 11... 12 constituting the high-rise part 1 c of the tower 1 are assembled, the inner frame 3 of the base 1 a. The process of constructing is performed. That is, as shown in FIG. 7, after the tower component 12 ′ at the lowest node disposed immediately above the base 1 a is joined to the tower component 12 above and pushed up, the base 1 a The inner frame 3 is constructed. Specifically, first, an inner frame constituting portion 13 constituting the inner frame 3 of the base portion 1a is carried on the carriage 8 below the tower constituting portion 12 'at the lowermost node that has been raised. A process (carrying-in joining process) is performed for joining the frame constituent part 13 and the tower constituent part 12 'in the lowermost section thereon. Next, similarly to the push-up process described above, a process (push-up process) of pushing up the inner frame constituting part 13 together with the high-rise part 1c by the push-up means 7 is performed. By repeating this carry-in joining process and push-up process, the internal frame constituting part 13 is assembled in order from the upper node, and the internal frame 3 of the base part 1a is constructed.

  On the other hand, after the tower constituent part 12 consisting only of the inner frame 3 rises to above the base part 1a, a step of attaching the outer frame 2 to the outer periphery of the inner frame 3 of the tower constituent part 12 is performed. Specifically, the upper frame 6 is used to attach the outer frame 2 to the outer periphery of the tower constituting unit 12 including only the inner frame 3 above the base portion 1a.

  According to the construction method of the tower 1 having the above-described configuration, the tower component units 11 and 12 in the next section are carried below the raised tower component units 10, 11, and 12, 12 and the tower component 10, 11, 12 thereabove and the tower component 11, 12 are pushed up by the push-up means 7, and the tower component constituting the tower 1 is repeated. 10, 11..., 12... Are assembled in order from the upper section, so that the joining operation of the tower constituent parts 10, 11. For this reason, the super-high tower 1 can be constructed | assembled, without using a very large crane, and cost reduction can be aimed at. In addition, there is a possibility that the problem of radio interference may occur when using an ultra-large temporary tower crane or the like. However, according to the construction method having the above-described configuration, the temporary crane 6 may be a normal size crane, Problems are unlikely to occur.

Moreover, according to the construction method of the tower 1 described above, work at high places can be greatly reduced, so that workability can be improved, temporary costs can be reduced, work schedule delay can be prevented, and safety can be improved. Furthermore, it is possible to prevent scattering of dust and the like around the site.
Moreover, according to the construction method of the tower 1 described above, the high-rise part 1c of the assembled tower 1 rises slowly and gradually, so that the anxiety of the surrounding residents can be reduced.

  Further, since the tower components 11 and 12 are pushed up by the push-up means 7 while being supported on the outer frame 2 of the base 1a, the tower components 10, 11,... 12 to be pushed up are the outer frames of the base 1a. 2 to prevent falls. For this reason, it is not necessary to provide a temporary installation for support, and it is possible to save time and labor for installation and dismantling of the temporary installation and to reduce temporary expenses.

  Moreover, according to the construction method of the tower 1 having the above-described configuration, the outer frame 2 is excluded from the node that interferes with the outer frame 2 of the base portion 1a when the outer frame 2 is present, and only the inner frame 3 is removed. The tower component 12 is carried into the inside of the outer frame 2 of the base portion 1a and joined to the tower component 12 of the upper node. Therefore, the outer shape of the tower component 12 to be pushed up is as follows. It becomes smaller by the removed amount, and it becomes difficult to interfere with the outer frame 2 of the base portion 1a at the time of push-up. Then, after the tower constituent part 12 is raised above the base part 1a, the outer frame 2 is attached to the inner frame 3 of the tower constituent part 12, whereby the two parts comprising the outer frame 2 and the inner frame 3 are provided. A heavy structure is constructed. Thereby, the tower structure part 12 can be pushed up smoothly.

  As mentioned above, although embodiment of the construction method of the tower which concerns on this invention was described, this invention is not limited to above-described embodiment, In the range which does not deviate from the meaning, it can change suitably. For example, in the above-described embodiment, the case of constructing a super-high tower 1 having a height of 600 m is described. However, the present invention may be a case of constructing a tower having a low height. It is not limited to the height.

  Further, in the above-described embodiment, the tower component 10 and the tower components 11... 12 below it are assembled with the antenna unit 4 attached to the tower component 10 at the uppermost section. When assembling the tower component, the antenna unit is accommodated in one of the tower components, and after the push-up of the bottom tower component is completed, the antenna unit is pushed up. Or you may raise by a lift-up construction method and you may arrange | position to the topmost part of a tower. For example, the antenna unit is accommodated in the uppermost tower component, and a rising mechanism such as a jack is provided in the tower component. Then, when the assembly of the tower component is completed, the above-described antenna unit is pushed up or lifted up by the ascending mechanism and is erected on the upper end of the uppermost tower component. By adopting a method for projecting the antenna unit 4 from the rear as described above, the antenna unit is accommodated in the tower component when the tower component is pushed up, and the antenna unit is not subjected to wind. Thereby, reduction of the wind load at the time of push-up can be expected.

  Further, in the above-described embodiment, after the push-up of the lowermost tower component is completed, the antenna unit is raised by the push-up method or the lift-up method, but the present invention pushes the tower component. The antenna unit may be raised by a push-up method or a lift-up method in the middle of up.

  In the above-described embodiment, the uppermost tower component 10 is assembled in the outer frame 2 of the base portion 1a. However, in the present invention, the uppermost tower component 10 is preassembled in another place. Then, the assembled tower component may be carried into the outer frame of the tower base. Further, in the above-described embodiment, the tower constituent parts 11... 12 constituting the tower high-rise part 1c are pre-assembled in another place on the carriage 8 and placed in the outer frame 2 of the base part 1a. Although carried in, the present invention may assemble the tower constituent part constituting the tower high-rise part in the outer frame of the base part.

  In the above-described embodiment, first, the tower component 11 composed of the outer frame 2 and the inner frame 3 is assembled, and the tower component 12 composed of only the inner frame 3 is assembled at a certain node. However, although the outer frame 2 is retrofitted, the present invention may be a method of assembling a tower component composed of an outer frame and an inner frame from the beginning to the end, or from the beginning to the end. It may be a method of assembling a tower component composed of only the inner frame and retrofitting the outer frame. Furthermore, the present invention assembles a tower component composed of an external frame and an internal frame together with a tower component composed only of the internal frame, and attaches the external frame to a place where there is no external frame. It may be a construction method.

  In the above-described embodiment, a method of constructing a tower 1 that is a steel tower, that is, a steel-structured tower 1 is described. However, the present invention may construct a tower having another structure. For example, a reinforced concrete tower or a tower having a composite structure in which a steel plate and reinforced concrete are combined may be used.

  In the above-described embodiment, the construction method of the tapered tower 1 is described upward. However, the present invention may be a tower having another shape, for example, over the entire height. It may be a method of constructing a columnar tower having a cross section, or a method of constructing a tower having a shape that is tapered stepwise. Furthermore, the method of constructing the tower of the shape formed by combining a columnar tower component and a tapered tower component may be used.

  In addition, in the range which does not deviate from the main point of this invention, it is possible to replace suitably the component in above-mentioned embodiment with a well-known component, and you may combine the above-mentioned modification suitably.

It is an elevation view of the tower for explaining the embodiment of the tower construction method according to the present invention. It is sectional drawing of the tower for demonstrating embodiment of the construction method of the tower which concerns on this invention. It is an elevation view showing the construction status of the tower for explaining the embodiment of the tower construction method according to the present invention. It is an elevation view showing the construction status of the tower for explaining the embodiment of the tower construction method according to the present invention. It is an elevation view showing the construction status of the tower for explaining the embodiment of the tower construction method according to the present invention. It is an elevation view showing the construction status of the tower for explaining the embodiment of the tower construction method according to the present invention. It is an elevation view showing the construction status of the tower for explaining the embodiment of the tower construction method according to the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tower 1a Base part 2 External frame 3 Internal frame 4 Antenna part 7 Push-up means 10 Tower component parts 11 and 12 of the uppermost section Tower component part 14 Jack mechanism

Claims (3)

In the construction method of the tower with a double structure in which the inner frame is formed inside the outer frame,
After constructing the outer frame of the base of the tower and carrying in or forming the uppermost tower component constituting the top of the tower inside the outer frame of the base, the tower component of the uppermost section is , While being supported on the outer frame of the base portion, it is pushed up by push-up means provided on the outer frame of the base portion,
Then, the tower component of the next section is carried in or formed below the raised tower component, and the tower component of the next section and the tower component thereon are joined, and the tower component By repeating the step of pushing up by the push-up means while being supported on the outer frame of the base, the tower constituent parts constituting the tower are assembled in order from the upper section,
The tower construction method is to construct the inner frame of the base part after the bottom part tower constituent part disposed immediately above the base part is joined to the tower constituent part above it and pushed up. And
The outer frame is removed and the tower component consisting only of the inner frame is carried or formed inside the outer frame of the base and joined to the tower component of the upper node,
A tower construction method , wherein the tower component is raised to above the base and then an external frame is attached to the inner frame of the tower component . In the tower construction method according to claim 1 ,
When assembling the tower component, the antenna unit to be built at the top of the tower is accommodated in any tower component,
A tower construction method, wherein the antenna portion is raised by a push-up construction method or a lift-up construction method and disposed at the top of the tower. In the construction method of the tower according to claim 1 or 2 ,
In the step of pushing up the tower constituent part, the horizontal position of the tower constituent part is corrected by a jack mechanism provided on an external frame of the base part.

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