JPH11324306A - Work stage device for constructing steel tower and steel tower construction method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the construction property by covering an opening through which a steel tower formed on a work stage main body is inserted with a movable floor plate and lifting and lowering them freely. SOLUTION: A work stage device 1 is constituted by a first work stage part 4 and a second work stage part 7 at two upper and lower stages formed by work stage main bodies 2, 5 and movable floor plates 3, 6 and a lifting and lowering means 8. At the time of construction, a steel tower S to be constructed in an opening 2a of the main bodies 2, 5 is positioned and the floor plates 3, 6 are moved to block the opening 2a. Next, a process in which the floor plates 3, 6 are retracted from the opening 2a after the steel tower S is constructed by one step and the stages 4, 7 are lifted by one step by the lifting and lowering means 8 is repeated. Then, when an outer peripheral ring is constructed, a process in which the stages 4, 7 are lowered until a face of the stage 4 comes to the height corresponding to a bottom face of the outer peripheral ring to attach the outer peripheral ring is repeated, and the stages 4, 7 and a tower crane T are disassembled and removed at the final position. Consequently, the steel tower can be constructed safely and efficiently.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction technique of a steel tower used as a radio tower, for example.

[0002]

SUMMARY OF THE INVENTION Steel towers, especially those with a height of 1
When constructing a large steel tower having a length of more than 00 m, a normal work scaffold assembled using temporary materials cannot be used. For this reason a temporary work stage is used which is directly attached to the already constructed part of the tower.

[0005] FIG. 25 shows an installation state of this temporary work stage. In the figure, reference numeral 41 denotes a temporary work stage, which is provided in two upper and lower stages. And
At both end edges of the temporary work stage 41, a vertical temporary material 43 is erected in parallel with a steel column 42 constituting a steel tower, and a vertical curing net 44 is stretched over the vertical temporary material 43.

The temporary work stage 41 is composed of three types of units A, B and C, as can be seen from FIG. These units A, B, and C have a structure that can be connected and separated from each other.
A plurality of 1a are formed. The steel columns 42 that make up the tower are
All of them pass through the opening 41a. By the way, in this way, the temporary work stage 41 installed on the steel tower under construction is removed as soon as it becomes unnecessary, that is, once the construction work of the part where it is installed is completed, the upper part construction stage is removed. The re-arranging operation requires a great deal of labor. In particular, the temporary work stage 41 is once set to A, B, and C three times.
The task of disassembling into different types of units and reconnecting them is
This is very time-consuming and can affect the progress of the construction. In addition, since the work of changing the temporary work stage 41 is performed at a high place, it is extremely dangerous and it is difficult to secure safety.

[0005] Usually, a steel tower is provided with an outer peripheral ring (outer peripheral structure) for arranging antennas. However, since the outer peripheral ring protrudes greatly from the tower main body, it hinders the temporary work stage changing operation performed after the outer ring is completed. In other words, the outer peripheral ring assembled using the temporary work stage and attached to the tower main body makes the work of changing the temporary work stage more difficult.

Therefore, an object of the present invention is to provide a technique for constructing a steel tower in which work stages can be efficiently and safely changed. Another object of the present invention is to provide a tower construction technology capable of efficiently constructing a tower having an outer peripheral structure.

[0007]

SUMMARY OF THE INVENTION An object of the present invention is to provide a work stage apparatus used for constructing a steel tower, the work stage body having an opening through which a steel tower to be constructed can be inserted, A steel tower, comprising: a movable floor plate provided so as to be displaceable with respect to the work stage main body so as to cover the opening; and elevating means for raising and lowering the work stage main body together with the movable floor plate. The problem is solved by the construction work stage device.

In particular, it is an object of the present invention to provide a work stage device used for constructing a steel tower, the work stage body having an opening through which a steel tower to be constructed can be inserted, and to cover the opening of the work stage body. A movable floor plate provided so as to be displaceable with respect to the work stage body, and lifting means for raising and lowering the work stage body together with the movable floor plate, comprising the work stage body and the movable floor plate. A plurality of work stage units are provided in the height direction of the steel tower to be constructed, and the plurality of work stage units are connected to each other so as to simultaneously move up and down by the action of the elevating means. The problem is solved by a work stage apparatus for building a steel tower.

Another object of the present invention is to provide a method for constructing a steel tower using the above-mentioned work stage apparatus for building a steel tower, wherein the steel tower to be built is located in an opening of the work stage body.
A step of installing the work stage device for construction of the steel tower,
After the step B of displacing the movable floor plate so as to cover the opening of the work stage main body and the work performed on the work stage main body and / or the movable floor plate are completed, the movable floor plate is reversed from the step B. C step of displacing in the direction, and retracting the movable floor plate from above the opening of the work stage main body, and D step of operating the elevating means to raise the work stage main body together with the movable floor plate by a predetermined amount, If necessary, the above steps B, C, and D are repeatedly performed in order to solve the problem.

[0010] In particular, an object of the present invention is a method for constructing a steel tower using the above-mentioned work stage apparatus for building a steel tower, wherein the steel tower to be built is located in the opening of the work stage body.
A step of installing the work stage device for construction of the steel tower,
After the step B of displacing the movable floor plate so as to cover the opening of the work stage main body and the work performed on the work stage main body and / or the movable floor plate are completed, the movable floor plate is reversed from the step B. A step of displacing the movable stage plate in the direction and retracting the movable floor plate from above the opening of the work stage body; a step D of operating the elevating means to raise the work stage main body together with the movable floor plate by a predetermined amount; , And an E step of lowering the work stage body by a predetermined amount, and an F step of assembling and attaching a steel tower outer peripheral structure using the work stage body lowered in the E step, If necessary, the steps B, C and D are repeated in order, and after the construction of the uppermost part of the tower is completed, the steps E and F are performed as necessary. Is solved by a steel tower construction wherein the repeatedly performed in sequence.

In the above work stage apparatus for building a tower, a reaction force rod fixed to an already built part of the tower is connected to the work stage body as the elevating means, and the reaction tower is supported by the reaction force rod. And a jack configured to raise and lower the work stage body by the vertical movement of the jack itself. Alternatively, as a lifting / lowering means, a jack fixed to an upper end side of an already constructed portion of a steel tower, and a suspending member extending from the jack and having a lower end side connected to a work stage body are provided. It is possible to use one configured to raise and lower the work stage main body by a material pulling-in operation or a hanging material feeding-out operation.

As described above, the work stage apparatus for constructing a steel tower according to the present invention has a work stage body having an opening through which a steel tower to be constructed can be inserted, and an opening of the work stage body as required. It has a movable floor plate that can be covered, and lifting means for raising and lowering the work stage body and the movable floor plate. Therefore, the tower construction work can be safely performed on the work stage main body and the movable floor plate protruding above the opening thereof. Further, at the time of rearrangement, the movable floor plate that has protruded above the opening of the work stage body may be retracted, so that the structural material (for example, steel (Beams and braces). Therefore, by operating the lifting / lowering means to raise the work stage body as it is, it is possible to safely and efficiently change the arrangement. And when the tower has an outer peripheral structure,
In the construction method of the present invention, first, only the tower main body is completed, and then, while the work stage device is lowered stepwise, the outer peripheral structure is assembled thereon and attached to the tower main body. Therefore, unlike the conventional method, the completed outer peripheral structure does not hinder the changing of the work stage device. Therefore, even when the steel tower has the outer peripheral structure, the construction work can be performed safely and efficiently.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described in detail with reference to FIGS. FIG. 1 is an external view showing the installation state of the work stage device for constructing a tower according to the present embodiment. FIGS. 2 and 3 are side and plan views showing the work stage device for constructing the tower in the installed state. FIG. 5 is a plan view showing a state in which a part of the movable floor plate is displaced, FIG. 5 is an enlarged plan view of a portion provided with the lifting / lowering means, and FIGS.
1 is a process diagram of a steel tower building method according to the present embodiment.

As can be seen from FIG. 1, the work stage device (hereinafter abbreviated as work stage device) for building a tower according to the first embodiment is used for building a tower, particularly a large tower. That is, in FIG. 1, reference numeral 1 denotes a work stage device, and this work stage device 1 is installed in a part of the steel tower S that has already been constructed. And the construction work of the remaining part of the steel tower S is performed using it. At this time, a tower crane T is installed adjacent to the steel tower S to be constructed. As will be described in detail later, the horizontal stays for preventing the tower crane from collapsing are the mast of the tower crane T and the steel tower S.
As well as between the mast of the tower crane T and the work stage device 1.

The work stage device 1 of the present embodiment is shown in FIG.
As shown in FIG. 3 and FIG. 3, a first work stage unit 4 generally including a work stage main body 2 and a movable floor plate 3
A second work stage 7 which is located below the first work stage 4 and comprises a work stage main body 5 and a movable floor plate 6; and a second work stage 7 and a second work stage Lifting means 8 for raising and lowering the work stage 7.

The work stage main body 2 constituting the first work stage section 4 has a square opening 2a at the center through which a steel tower S to be constructed can be inserted. Also,
A work scaffold 9 is provided on the work stage main body 2 so as to surround the opening 2a. On the other hand, regarding the movable floor plate 3, the movable floor plate 3 is provided so as to be displaceable with respect to the work stage main body 2 so as to cover the opening 2 a of the work stage main body 2. In particular, in the present embodiment, the movable floor plate 3 is disposed on the work stage main body 2 via the pair of guide rails 10. A state in which a part of the movable floor plate 3 is displaced and the opening 2a of the work stage main body 2 is covered by about half is as shown in FIG. 4 (however, in the state of FIG. 4, all the guide rails 10 completely project. ing). As can be seen from the figure, the guide rail 10 on one side (right side in the figure) and the movable floor plate 3 are of a two-stage type. Although not shown in detail in the figure, the guide rail 10 protruding above the opening 2 a of the work stage main body 2 is supported by a steel beam 12 constituting a steel tower S together with a steel column 11.

When covering the opening 2a of the work stage main body 2 with the movable floor plate 3, first, the guide rail 10 is opened.
a, and then the movable floor plate 3 may be displaced along the projected guide rail 10. on the other hand,
When opening the opening 2a of the work stage main body 2 at the time of changing the work stage device 1, the procedure is the reverse of this. That is, first, the movable floor plate 3 is moved along the guide rail 10 to above the work stage main body 2. Then, when this is completed, the guide rail 10 is retracted to the original position, and the preparation for the change is completed.

An elevating means 8 for elevating and lowering the first work stage 4 and the second work stage 7 is connected to the reaction rod 13 fixed to the already constructed part of the steel tower S and the work stage main body 2. (Center hole jack) 14, and supported by a reaction force rod 13
Consists of There are four lifting means 8 at each of the four corners of the opening 2 a of the work stage main body 2, four in total. Note that the jack 14 is not directly joined to the work stage main body 2, but as shown in FIG. 5, the work stage is supported via a support plate 15 having a through hole formed at a position corresponding to the reaction force rod 13. It is attached to the main body 2. On the other hand, the reaction rod 13 is supported by a buckling stopper 16 disposed at a predetermined interval between the reaction rod 13 and the steel column 11. Therefore, the lifting / lowering means 8 serves to raise / lower the work stage main body 2 and therefore the first work stage unit 4 by the vertical movement of the jack 14.

A second work stage unit 4 is provided along the height direction of the steel tower S to be constructed so as to overlap the first work stage unit 4.
The work stage 7 has the same structure as that of the first work stage 4, except that the work stage 7 does not have a portion to which the jack 14 of the elevating means 8 is connected. Therefore, the description is omitted. The first work stage unit 4 and the second work stage unit 7 are interconnected using a vertical member 17. For this reason, when the first work stage 4 rises by the action of the lifting / lowering means 8, the second work stage 7 also rises by the same amount. In addition, in the vertical member 17,
One end of the horizontal stay 18 provided between the work stage device 1 and the mast of the tower crane T is connected to the above. However, for the other end of the horizontal stay 18,
It is configured to be able to move up and down along the mast of the tower crane T. On the other hand, the other horizontal stays 19 are connected to the steel columns 11 constituting the tower S, and the ends thereof are in a completely fixed state.

The work stage device 1 is of a two-stage type as described above, because different work stages, such as work for building steel columns and steel beams, welding, and thermal spraying, are performed using individual work stage sections. This is done in parallel to shorten the construction period. Therefore, in some cases, the work stage device may have a single-stage configuration. Subsequently, a method for constructing a steel tower using the work stage apparatus (hereinafter, referred to as the present construction method) will be described with reference to FIGS.

In carrying out the present construction method, first, the work stage device 1 is installed so that the steel tower S to be built is located in the opening 2a of the work stage main body 2 (the same applies to the work stage main body 5) (A). Step: see FIG. 6). However, the detailed situation at the time of installation has already been described when the structure of the work stage apparatus 1 has been described, and thus will not be described here. Actually, the upper end portion of the steel tower S is in a state where the work stage device 1 is completely inserted at this time. Further, in the steel tower S, the portion where the work stage device 1 is installed was constructed using the conventional method.

When the installation of the work stage device 1 is completed, the movable floor plates 3 and 6 are then displaced so as to cover the openings of the work stage bodies 2 and 5 (Step B: see FIG. 7). When the openings of the work stage main bodies 2 and 5 are closed by the movable floor plates 3 and 6, the construction work of the steel tower S is performed by using them (see FIGS. 8 and 9). More specifically, the first work stage unit 4 and the work scaffold 9 are used to construct the steel column 11, the steel beam 12, the brace (not shown), the addition of the reaction force rod 13, and the like. Utilizing the second work stage section 7 and the work scaffold 20 provided thereon, welding and spraying processing (rust prevention processing by zinc coating) of the already erected members and mounting work of the buckling prevention 16 are performed. I do.

When the main construction work of the steel tower S has been completed for one stage, the movable floor plates 3 and 6 are then displaced in the direction opposite to the above-mentioned step B. That is, the movable floor plates 3 and 6 are retracted from the respective openings of the work stage main bodies 2 and 5 (Step C: see FIG. 10). When the work stage device 1 returns to the initial state shown in FIG. 6, the elevating means 8 is operated to raise the first work stage unit 4 and the second work stage unit 7 by a predetermined amount. That is, the work stage device 1 itself is lifted by one stage, so that the next tower can be constructed (Step D: see FIG. 11).

From then on, the above-mentioned B step, the main construction step of the steel tower S, the C step, and the D step may be repeatedly performed until the construction of the uppermost part of the steel tower S is completed. Are completed as shown in FIG. After the main body of the steel tower S is completed in this way, the process moves to the construction of an outer peripheral ring (outer peripheral structure) provided around the main body.

When constructing the outer peripheral ring, first, the elevating means 8 of the work stage device 1 is operated to move the first work stage unit 4 and the second work stage unit 7 by a predetermined amount.
That is, it is lowered to the position where the outer peripheral ring is provided (Step E: see FIG. 13). To be precise, it is the first working stage 4 that is actually used to construct the outer ring.
Therefore, the first work stage unit 4 and the second work stage unit 7 are lowered until the surface of the first work stage unit 4 has a height corresponding to the bottom surface of the outer ring to be constructed. The unnecessary work scaffold 9 is removed prior to this. Further, a part of the horizontal stay member 19 and the reaction force rod 13 which have become unnecessary are removed before and after the first work stage unit 4 and the second work stage unit 7 descend.

When the first work stage unit 4 is lowered together with the second work stage unit 7 to the position where the outer peripheral ring is provided, the outer ring is assembled and mounted using the lower stage (step F). ). The state in which the assembly of the outer peripheral ring is completed is as shown in FIG. 14 (in the figure, the outer peripheral ring is indicated by 21). Here, the work was performed with the movable floor plate 3 stored, but if necessary, the movable floor plate 3 may be displaced so as to cover the central opening.

Thereafter, the above steps E and F are repeatedly performed in order to assemble and attach the outer peripheral ring. Incidentally, the state in the middle of assembling the third outer peripheral ring from the top is as shown in FIG. When the entire outer peripheral ring 21 is completed, as shown in FIG. 16, the unnecessary first work stage unit 4 and second work stage unit 7 are lowered. Then, after lowering it to the final position, it is dismantled and removed. Further, the tower crane T is dismantled and removed, and the construction work of the steel tower is completed.

As described above, in the present embodiment, the work stage apparatus 1 for constructing a tower is mainly composed of the work stage body 2 having an opening through which the constructed tower S can be inserted.
5, movable floor plates 3 and 6 that can respectively cover the openings thereof as needed, and work stage bodies 2 and 5 and movable floor plates 3 and 6, that is, the first work stage unit 4 and the second
And a lifting means 8 for raising and lowering the work stage unit 7 together. Therefore, the tower construction work can be performed safely on the work stage bodies 2 and 5 and the movable floor plates 3 and 6 protruding above the openings thereof. Further, at the time of changing the arrangement, the movable floor plates 3 and 6 that have protruded above the openings of the work stage bodies 2 and 5 may be retracted. Nothing interferes with the steel beams and braces, which are the structural materials of the steel tower S inside. Therefore, by operating the lifting / lowering means 8 to raise the work stage bodies 2 and 5 as they are, the rearrangement can be performed safely and efficiently. Furthermore, in the construction method of the present embodiment, first, only the tower main body is completed, and thereafter, the work stage device 1 (particularly, the first work stage unit 4 and the second work stage unit 7) is lowered stepwise. Meanwhile, the outer peripheral ring 21 was assembled thereon and attached to the tower main body. Therefore, unlike the conventional method, the completed outer ring does not hinder the changing of the work stage device 1. Therefore, as mentioned here as the embodiment, the steel tower S is connected to the outer peripheral ring 2.
1, the construction work can be performed safely and efficiently.

Next, a second embodiment of the present invention will be described with reference to FIGS. 17 and 18 are a side view and a plan view showing the work stage device for constructing a steel tower according to the present embodiment in an installed state, FIG. 19 is an enlarged side view of a portion provided with a lifting / lowering means, and FIGS. 1 is a process diagram of a steel tower building method according to the present embodiment. However, the basic technical idea of the second embodiment is the same as that of the first embodiment. Therefore, the following description focuses on the differences from the first embodiment.

As shown in FIGS. 17 and 18, the work stage device of the present embodiment also generally includes a first work stage portion 24 composed of a work stage main body 22 and a movable floor plate 23, and a first work stage. A second work stage 27 which is located below the part 24 and is composed of a work stage main body 25 and a movable floor plate 26, and an elevating unit for raising and lowering the first work stage 24 and the second work stage 27 Means 28. Such a basic structure is the same as that of the first embodiment, but the work stage device of the present embodiment uses a wire (hanging member) 29 as the elevating means 28 instead of a combination of a reaction rod and a center hole jack. And a jack 30 having a function of pulling it in.

More specifically, the lifting / lowering means 28 includes a hydraulic jack 30 fixed to the upper end of the already constructed portion of the steel tower, and a hydraulic jack 30 extending from the jack 30 and having a lower end directly to the work stage main body 22. Connected wire 29
The work stage main body 22, that is, the first work stage unit 24 and the second work stage unit 27 are simultaneously moved up and down by the wire drawing operation or the wire feeding operation of the jack 30.

The installation state of the jack 30 is shown in FIG.
As shown in FIG. That is, the jack 30 includes a horizontal member 31a and a diagonal member 31b, and is installed using the support member 31 fixed to the uppermost portion of a steel column constituting a steel tower. In addition, the work stage device of the present embodiment includes the canker material 32. This is because the support state of the first work stage unit 24 and the second work stage unit 27 becomes somewhat unstable compared to the previous embodiment using the reaction force rod. During the construction of the steel tower, the kanuki wood 32 is stretched between the work stage main body 22 and the steel beam 33 constituting the first work stage unit 24, and
Work stage section 24 and second work stage section 27
Plays a role in stably supporting. 18 is in a state of being bridged between the work stage main body 22 and the steel beam 33, while the lower canker 32 in FIG. It is in a state where it is not bridged between the stage main body 22 and the steel beam 33, that is, in a completely retracted state. When the first work stage 24 and the second work stage 27 are raised by the operation of the elevating means 28, all the cannus 32 are completely retracted so as not to hinder their movement. Become.

Next, with reference to FIGS. 20 to 24, a method for constructing a steel tower using the above-mentioned work stage apparatus (hereinafter referred to as the present construction method) will be described focusing on differences from the first embodiment. In carrying out the present construction method, first, the work stage device is installed in a steel tower S ′ built in the opening of the work stage main body 22 (the same applies to the work stage main body 25).
(Step A: see FIG. 20). At this time, the cannus 32 is attached to the work stage main body 22.
And the steel beam 33. In this state, the work stage main body 22 and the jack 30 are brought close to each other as much as possible.

When the installation of the work stage device is completed, the movable floor plates 23 and 26 are then displaced so that the openings of the work stage main bodies 22 and 25 are covered (step B). FIG. 20 shows a state where only the movable floor plate 26 is displaced. When the openings of the work stage main bodies 22 and 25 are closed by the movable floor plates 23 and 26, the main construction work of the steel tower S 'is performed by using them (see FIGS. 21 and 22). That is, using the first work stage unit 24 and the work scaffold 34, the steel column 3
5 and the steel beams 36 and braces (not shown), and the second work stage 27 and the work scaffold 37 provided thereon are used to weld or spray the already built members. Perform processing.

When the main construction work of the steel tower S 'is completed for one stage, the movable floor plates 23, 26 are subsequently displaced in the direction opposite to the step B, and the work stage bodies 22, 25 are moved.
Retreat from above each opening (Step C). Prior to this, as shown in FIG. 23, the jack 30 is rearranged. That is, once the jack 30 is removed, it is installed on the upper end side of the newly constructed steel column 35.

After the work stage device is again suspended by the wire 29 extending from the re-arranged jack 30, the cannus 32 is retracted and the supporting state is released. Then, the elevating means 28 is operated,
The first work stage unit 24 and the second work stage unit 27 are raised by a predetermined amount. That is, the work stage device itself is raised by one stage, so that the next stage of the tower can be constructed (Step D: see FIG. 24).

Thereafter, until the construction of the uppermost part of the main body of the tower S 'is completed, the above-mentioned step B, the main construction step of the tower S',
Step C and step D may be repeatedly performed in order. Then, after the main body of the steel tower S 'is completed, the first work stage unit 2 is constructed according to the construction method of the first embodiment.
While lowering the fourth and second work stage portions 27 stepwise, the outer peripheral ring is assembled and attached using the first work stage portion 24, and the steel tower S 'is completed.

[0038]

According to the present invention, the work stage can be changed efficiently and safely. Further, even when the steel tower to be constructed has the outer peripheral structure, the construction work can be performed efficiently.

[Brief description of the drawings]

FIG. 1 is an external view showing an installation state of a work stage device for constructing a steel tower according to a first embodiment.

FIG. 2 is a side view showing the work stage device for constructing a steel tower according to the first embodiment in an installed state;

FIG. 3 is a plan view showing a work stage apparatus for constructing a steel tower according to the first embodiment in an installed state;

FIG. 4 is a plan view showing a state where a part of a movable floor plate is displaced in the work stage device for constructing a steel tower according to the first embodiment.

FIG. 5 is an enlarged plan view of a portion of the work stage device for constructing a steel tower according to the first embodiment, in which a lifting means is provided.

FIG. 6 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 7 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 8 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 9 is a process diagram of a method for building a steel tower according to the first embodiment.

FIG. 10 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 11 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 12 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 13 is a process chart of the method for building a steel tower according to the first embodiment.

FIG. 14 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 15 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 16 is a process diagram of a steel tower building method according to the first embodiment.

FIG. 17 is a side view showing a work stage device for constructing a tower according to the second embodiment in an installed state;

FIG. 18 is a plan view showing the work stage device for constructing a steel tower according to the second embodiment in an installed state.

FIG. 19 is an enlarged side view of a portion provided with a lifting / lowering means in the work stage device for constructing a steel tower according to the second embodiment.

FIG. 20 is a process diagram of a steel tower building method according to the second embodiment.

FIG. 21 is a process diagram of a steel tower building method according to the second embodiment.

FIG. 22 is a process diagram of a steel tower building method according to the second embodiment.

FIG. 23 is a process diagram of a steel tower building method according to the second embodiment.

FIG. 24 is a process diagram of a steel tower building method according to the second embodiment.

FIG. 25 is a side view showing an installation state of a conventional temporary work stage.

FIG. 26 is a plan view of a conventional temporary work stage.

[Explanation of symbols]

 S Steel tower T Tower crane 1 Work stage device for building a steel tower 2, 5 Work stage body 3, 6 Movable floor plate 4 First work stage 7 Second work stage 8 Elevating means 9, 20 Work scaffold 10 Guide rail 11 Steel frame Pillar 12 Steel beam 13 Reaction rod 14 Jack 15 Support plate 16 Buckling prevention 17 Vertical member 18, 19 Horizontal stay member 21 Outer ring (outer peripheral structure)

Claims (6)

[Claims] 1. A work stage device used for constructing a steel tower, comprising: a work stage main body having an opening formed therein through which a steel tower to be constructed can be inserted; and an opening of the work stage main body.
A work stage apparatus for constructing a steel tower, comprising: a movable floor plate displaceably provided with respect to the work stage main body; and elevating means for raising and lowering the work stage main body together with the movable floor plate. 2. A plurality of work stage sections each including a work stage body and a movable floor plate are provided in a height direction of a steel tower to be constructed, and the plurality of work stage sections are operated by an elevating means. The work stage apparatus for constructing a steel tower according to claim 1, wherein the work stage apparatus is connected to each other so as to move up and down at the same time. 3. The lifting means comprises: a reaction rod fixed to an already constructed portion of a steel tower; and a jack connected to a work stage main body and supported by the reaction rod. The work stage apparatus for steel tower construction according to claim 1 or 2, wherein the work stage main body is configured to be moved up and down by its own vertical movement. 4. A lifting means comprising: a jack fixed to an upper end of an already constructed portion of a steel tower; and a suspension member extending from the jack and having a lower end connected to a work stage main body. The work stage apparatus for constructing a steel tower according to claim 1 or 2, wherein the work stage main body is moved up and down by a suspending material pulling-in operation or a suspending material extending-out operation of a jack. 5. A method for constructing a steel tower using the work stage apparatus for constructing a steel tower according to any one of claims 1 to 4, wherein the steel tower to be constructed is located in an opening of the work stage main body. A step of installing the work stage device for constructing the tower, B step of displacing the movable floor plate so as to cover the opening of the work stage body, and work performed on the work stage body and / or the movable floor plate Is completed, the movable floor plate is displaced in the direction opposite to the B step, and the C step of retracting the movable floor plate from above the opening of the work stage body, and elevating means are operated to move the work stage body to the A method for constructing a steel tower, comprising: a step D for raising the movable floor plate by a predetermined amount together with the movable floor plate; and repeating the steps B, C, and D in order as necessary. 6. An E step of operating the lifting / lowering means to lower the work stage main body by a predetermined amount, and assembling and attaching a tower outer peripheral structure using the work stage main body lowered in the E process. The method according to claim 5, wherein the method further comprises: repeating the steps (E) and (F) as needed.