JP2015055062A - Lift type work scaffold device of tower crane - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lift type work scaffold device which utilizes a mast post of a large-scale tower crane and is superior in workability, safety, and economical efficiency.SOLUTION: A lift type work scaffold device includes: a lift driving unit 8 attached to a mast post 2 of a large-scale tower crane 1; and a work deck 3 integrally connected with the lift driving unit, which can be lifted along a mast of the tower crane. Though a mast of a conventional tower crane has been used only for lifting a tower crane body, the mast is also used for lifting the lift type work scaffold device.

Description

  The present invention relates to a work platform for a large tower crane for construction, for example, and in particular, a lift work platform that can be used for a mast column of a tower crane and its up / down lift platform (tower crane (around)). Including lifting / bounce-down lifting platform).

  In general, the height of the top floor is often several hundred meters in a construction work site of a large structure represented by high-altitude work, particularly a high-rise building. In the construction work of such a high-rise building, a large tower crane is used, and construction materials, equipment, etc. are transported and supplied from the ground to a high construction site.

  Conventionally, mast climbing type tower cranes are often used in the construction work of high-rise buildings. A mast-climbing tower crane has a crane main body that can be raised along a mast member that is erected on a foundation on the ground surface. The crane main body alternately extends and contracts a hydraulic cylinder, The main body is raised along the mast member. When the crane body rises to the vicinity of the upper end of the mast member, a new mast member is lifted from the ground by the main body arm, the lower end of the new mast member is connected to the upper end of the existing mast member, and then the crane is moved along the new mast member. The main body is further raised.

  In this way, tower cranes extend the mast, which is a column, to a high place as the construction progresses and the height of the building rises, and accordingly the height and / or position of the tower crane also rises to a high place. It is pushed up to. The mast member is extended upward by connecting basic unit masts having a certain length.

  On the other hand, in the construction work of the outer wall of a high-rise building such as a large building, an elevating work scaffold device is used in order to secure a scaffold for human work. The elevating work scaffold device has a work scaffold deck that moves up and down along the mast with a small mast similar to the tower crane described above as a support, and moves up and down along the outer wall of the high-rise building. It is used as a scaffold for workers and a means of supplying materials and equipment.

  Although the mast as a support used in the large tower crane and the mast of the lifting type work scaffolding device have different sizes and specifications, they are basically extended by connecting basic unit masts having a strong truss structure. The mast for a tower crane functions as a strong support tower that supports a large tower crane, which is a heavy object, at the top and extends further upward. In addition, the mast of the lifting work platform device lifts and lowers a work platform deck that is large enough to efficiently transport workers etc. to the work site and supply materials and equipment to the work site. To function.

Japanese Patent Laid-Open No. 5-178777 Japanese Patent Laid-Open No. 2000-351577 JP 2011-246894 A

  The tower crane mast described above has conventionally been erected for raising and lowering large tower cranes, and the mast of the lifting work scaffold device has been used only for raising and lowering a work deck that is a scaffold. There are restrictions in the occupational safety and health law in construction work.For example, in the construction work of large buildings of high-rise buildings or construction work of large structures, large masts must be erected as many as the number of large tower cranes required. Necessary, and along with that, it will be erected with a ground space that will be a safe and strong foundation.

  On the other hand, in work that involves manual work such as construction of the building outer wall of a building, a lifting work scaffold device is used, and a work deck having a sufficient area to secure a necessary work scaffold and its lifting and lowering are required. As many masts as support columns will be erected in compliance with the safety regulations as many as necessary on the ground surface near the wall of the building structure.

  In the construction work of the same high-rise building, the construction by the tower crane and the construction by the lifting work scaffolding device are thus distinguished, and all the necessary masts for each construction are standing up from the ground. This is the current situation.

  In the construction of masts for tower cranes and elevating work scaffolding devices, secure and secure stable ground and necessary site area as well as securing and supplying materials and equipment related to mast standing, and in some cases The installation of a small crane for the construction of the mast required very complicated and expensive construction for each mast.

  The tower crane mast is not provided with an elevating work scaffold device, and similarly, the tower crane for transporting heavy objects cannot be installed on the mast of the elevating work scaffold device. In other words, the tower crane mast is not shared as the mast of the lifting work scaffold device, the tower crane mast is used only for the purpose of lifting the tower crane, and the mast of the lifting work scaffold device is the work deck. Has been used only for the purpose of lifting and lowering.

  For example, when a construction worker at the top of a tower crane needs to work on the wall surface of a building frame that uses a lifting work platform, he / she once got down to the ground using an elevator along the mast of the tower crane. Later, it had to be moved up again toward the high-rise work site using the lifting work scaffold device and its mast. Similarly, when moving from one tower crane to another tower crane, it was necessary to descend to the ground and then ascend again using the masts of the other tower cranes. In other words, it can be said that the mast of the tower crane did not have a work deck that can be lifted and lowered that can be effectively used as a work scaffold, and an overhanging scaffold for working close to other structures.

  Patent Document 1 describes a technical idea of providing a mast with a dedicated stage for attaching a tower crane mast stay to an outer wall of a high-rise building. This provides a working scaffold for construction work to the mast of a tower crane. Not what you want. This stage is not large enough for construction work, and is not intended for laying an overhanging scaffold intended for close contact with the building wall.

  Similarly, in Patent Document 2, the description about the scaffold when descending from the lifting equipment to the tower crane to the mast is explained in FIGS. 3, 4, and 5, but this is also the construction on the wall of the high-rise building. It does not disclose the technical idea of supplying an overhanging work scaffold for the purpose of work to the tower crane mast. Moreover, this scaffold is a technical concept as a temporary scaffold laid along the outer periphery of the mast, and is not sufficient as a size and a length required for work closely performed on the wall surface of a separate building structure.

  The present invention is intended to solve the above-described problems in the prior art, and dramatically improves the safety and workability of construction work for high-rise buildings, while also dramatically improving economic efficiency. It is an object to provide a working scaffold that can be used.

  As a means for solving the above-described problems, the present invention provides various lifting work scaffolding devices laid on the mast of a tower crane.

  A lifting tower for a large tower crane according to the present invention, which was developed to solve the above-described problems, was laid in conjunction with a lifting drive unit that lifts and lowers the mast column of the tower crane, and the lifting drive unit. It comprises a work deck, a power supply unit that supplies power to the lift drive unit, and a control unit that controls the lift drive unit, and forms a work scaffold that moves up and down along the mast column of the tower crane. And

  A work scaffolding device that performs high place work such as construction of a large structure or building maintenance includes a lift drive unit that lifts and lowers a mast column attached to a base frame on the ground, and a work deck coupled to the lift drive unit. It is also realized as an elevating work scaffolding device having

  The work deck is a unit attached to the mast column so as to be movable up and down. Preferably, a column structure inserted into the vertical axis material of the mast strut and a deck lower structure for supporting a work scaffold floor connected thereto (hereinafter referred to as a “deck plate”), and a desired location And a stopper mechanism that is fixed at a desired position and prevents a descent. The deck plate laid on the structure under the deck of the work deck functions as a working scaffold for construction workers, and construction materials and equipment are also secured on the deck plate. The drive device is a device having a function as a driving force for moving the work deck up and down, and is realized by using an automatic rotation drive device such as an electric motor or a pneumatic motor.

  In the tower crane lifting and lowering work scaffolding apparatus according to the present invention, the lifting drive unit is inserted into the mast column of a large tower crane, and the integrated scaffolding deck connected to the lifting drive unit is along the mast of the tower crane. It is a lifting type working scaffold device that can be lifted up and down. A conventional tower crane mast has been used only for raising and lowering the tower crane main body. However, the present application is characterized in that it is also used as a mast for raising and lowering a lifting work scaffold device.

  In the construction of a large high-rise building, as many large mast columns as the number of large tower cranes required are necessary, and a ground surface that will serve as a safe and strong foundation is secured and set up. Similarly, in work involving manual work such as construction of the building outer wall of a building, an elevating work scaffold device is used, and a work deck having a sufficient area to secure the necessary work scaffold and necessary for raising and lowering the work deck are used. As many masts as support columns are arranged in the vicinity of the wall surface of the building structure.

  In the construction work of the same high-rise building, the construction by the tower crane and the construction by the lifting work scaffolding device are thus distinguished, and all the necessary masts for each construction are standing up from the ground. However, the tower crane lifting and lowering work scaffolding device according to the present invention combines the mast of the tower crane as the mast of the lifting and lowering working scaffold, shortening the mast construction work period, The materials, materials and costs used can be greatly reduced.

  Similarly, since the number of mast struts that need to be erected can be reduced, it is extremely easy to secure a safe installation place having a solid ground for erection of the mast. Of course, the basic technical idea of the present invention is to contemplate the sharing of the mast between the tower crane and the liftable scaffolding device on the premise that safety and efficiency are commonly given top priority.

  In addition, the tower crane lifting / lowering work scaffold according to the present invention is connected to the lifting / lowering drive unit that lifts and lowers the mast column of the other tower crane by the work deck of the lifting / lowering work scaffolding device installed on the mast of one tower crane. It may be configured as. That is, it is also included in the technical idea of the present invention to provide an elevating work scaffold device connected to the masts of two or more tower cranes.

  In the case of a work deck that requires a certain length, stability may be lacking with only one mast column of a tower crane. In this case, the other mast column of the other tower lift is also provided with an elevating drive unit, and the other end of the long work deck is connected to support the stability of the elevating and lowering supported by the two mast columns. It is possible to secure an elevating work platform with good safety and a large space.

  As a result, when an operator moves from one tower crane to another tower crane, the troublesome movement process that once went down to the ground and then ascended to the other tower crane can be performed. By moving through the work deck of the lifting type work scaffolding device connected to the mast, it becomes possible to move in a high place. It becomes extremely easy to move the construction target place at the height of the worker.

  In another aspect, the tower crane lifting and lowering work platform according to the present invention can be fixed by suspending the vicinity of the tip of the work deck overhanging with a wire from the arm of the tower crane.

  In the case of a work deck that requires a certain length, stability may be lacking with only one mast column of a tower crane. In this case, it is possible to provide an overhanging scaffold having stability and sufficient strength by connecting the tip of the overhanging work deck to a wire suspended from the arm of the tower crane. It is possible to ensure the safety of the tip of the unstable overhanging scaffold that is horizontally projected from the mast of the tower crane. Thereby, an operator can work in close contact with an intricate part of a high-rise building or an inner wall of a building.

  Still another embodiment of the lifting / lowering work scaffolding device for a tower crane according to the present invention is such that a work deck laid on a lifting drive unit has one end connected to the lifting drive unit and the other end connected to the lifting drive unit. A lifting / lowering type lifting scaffold characterized in that it is formed substantially horizontally by jumping up or down in the vertical direction around a connecting laying portion. Hereinafter, the working scaffold having the work deck which is this embodiment of the lifting / lowering working scaffold device for a tower crane according to the present invention will be referred to as “bounce-up / fall-down lifting scaffold”.

  The raising / lowering type lifting scaffolding of the lifting / lowering working scaffold device of the tower crane according to the present invention has one end of the scaffolding deck joined to the lifting drive unit along the mast with a structure that can rotate in the vertical direction. Initially, it is fixed to the elevating drive unit in a form parallel to the mast in the vertical direction. For this reason, a mast can be raised / lowered with a raising / lowering drive part with an up-down vertical state. When the desired work position height is reached by moving up and down, the other end of the work deck jumps up or down substantially horizontally, and the overhanging scaffold can be formed substantially horizontally.

  The work deck bounce / bounce down drive structure of the bounce / bounce down type lifting scaffold may be a hydraulic drive mechanism using a rack and pinion mechanism or the like, or may be an electric drive mechanism.

  When the front end of the work deck is extended, when the front end expands and protrudes downward, it is a flip-down type, and when the front end is extended upward and protrudes, it is a flip-up type. It goes without saying that either structure may be used.

  As a result, the work on the wall of the building frame adjacent to the mast of the tower crane can be performed more closely by projecting the up / down type lifting scaffold. Moreover, it is not necessary to stand a new mast only for the lifting type working scaffold device as in the prior art.

  As described above, by using the lifting / lowering work scaffold of the tower crane according to the present invention, the mast used only for the tower crane can be used as the mast of the lifting / lowering work scaffold device. Therefore, it is not necessary to set up the mast for the lifting work scaffolding device at the part where the tower crane mast is erected, and it is possible to construct a structure using a tower crane of a high-rise building with only the minimum number of masts erected. And wall surface close-contact construction using a lifting work scaffold device.

  As described above, various effects other than those described above can be expected by performing the construction using the tower crane lifting and lowering working scaffold device according to the present invention. Conventionally, transportation of members, equipment, tools, etc. to a high-altitude site of a high-rise building that has been procured by repeatedly raising and lowering together with a lifting work scaffolding device can be sequentially performed by arm wire transportation of a tower crane. There is an effect that it is not necessary to interrupt the construction by moving up and down of the lifting work scaffolding device, and it is possible to easily carry in and carry members, equipment, tools and the like in a short time. For this reason, the construction period is greatly shortened and the construction cost is greatly reduced.

  With the tower crane lifting and lowering work scaffolding device according to the present invention, the construction work of high-rise structures can be performed in a comprehensive manner, improving workability, ensuring safety, shortening the work period, and reducing construction costs such as ease of construction management. It will be possible to fully demonstrate the superiority.

It is the conceptual diagram which showed the whole image of the raising / lowering type work scaffold apparatus of the tower crane which concerns on one Embodiment of this invention. It is the conceptual diagram which showed the whole image comprised with one mast of the raising / lowering type working scaffold apparatus of the tower crane which concerns on one Embodiment of this invention. It is the conceptual diagram which showed the state which suspended the work deck front-end | tip of the raising / lowering type work scaffold apparatus of the tower crane which concerns on one Embodiment of this invention with the tower crane. It is the conceptual diagram which showed the whole image of the raising / lowering type lifting scaffold of the raising / lowering working scaffold apparatus of a tower crane.

  Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings. In the following, the range necessary for the description for achieving the object of the present invention is schematically shown, and the range necessary for the description of the relevant part of the present invention will be mainly described. According to a known technique.

  FIG. 1 is a conceptual diagram showing an overall image of a lifting and lowering work scaffold device for a tower crane according to an embodiment of the present invention. An elevating work scaffold device 3 is laid using the masts 2 of the two tower cranes 1 as columns.

  As shown in FIG. 1, the tower crane lifting / lowering work scaffold device 3 according to the present invention has a lifting drive unit 8 inserted in a mast column 2 of a large tower crane 1 and connected to the lifting drive unit 8 to be integrated. This is an elevating work scaffolding device in which the work deck 9 that has become can be moved up and down along the mast 2 of the tower crane 1. A conventional tower crane mast has been used only for raising and lowering the tower crane main body. However, the tower crane mast is characterized in that it is also used as a mast for raising and lowering the lifting work scaffold device 3.

  The work deck 9 is a unit attached to the mast column 2 so as to be movable up and down. A deck lower structure 11 that supports a lifting drive unit 8 inserted in the vertical axis material of the mast column 2 and a deck plate 10 connected thereto, a drive device that enables position movement to a desired location, and a desired And a stopper mechanism that is fixed in position and prevents the descent. (The figure which shows the detail of a drive device and a stopper mechanism is abbreviate | omitted.)

  The deck plate 10 laid on the lower deck structure 11 of the work deck 9 functions as a working scaffold for construction workers, and construction materials and equipment are also secured on the deck plate 10. The driving device laid on the lifting / lowering drive unit 8 is a device having a function as a driving force for moving the work deck 9 up and down, and is realized by using an automatic rotation driving device such as an electric motor or a pneumatic motor.

  FIG. 2 is a conceptual diagram showing an overall image composed of one mast of a tower crane lifting work scaffolding apparatus according to an embodiment of the present invention. FIG. 2 shows the simplest tower crane elevating work scaffold device 3 in which the elevating drive unit 8 is pressed onto one mast 2 and the work deck 9 is connected.

  In addition, in FIG. 1, one lifting work scaffolding device 3 laid on two masts of two tower cranes 1 is shown, but the number of tower cranes and the number of masts are two or more. There may be two or more lifting / lowering work scaffolding devices. For example, three or more tower cranes, the work decks of the lifting work scaffolding devices laid on three masts arranged in a triangle shape, are connected in a triangular shape with the same height and the mast as the apex. It may be. In this case, since the work decks of the elevating work scaffolding device are connected with a truss structure in three units, structural strength is added to the whole tower crane as a unit, and the tower crane at a high place The effect of increased stability can also be expected.

  As described above, the tower crane 1 and the lifting work scaffolding device 3 are constructed by connecting the same mast 2 to the support column, thereby making it easier for the worker to move at a high place and to supply and transport materials and equipment. It is obvious that it has a great advantage on

  FIG. 3 is a conceptual diagram showing a state in which the tip of the work deck of the tower-type lifting work scaffolding device according to the embodiment of the present invention is suspended by the tower crane. In the tower crane lifting / lowering work scaffold device 3 according to the present invention shown in FIG. 3, the lifting drive unit 8 is inserted into the mast column 2 of the large tower crane 1 and connected to the lifting drive unit 8 to be integrated. The front end of the work deck 9 is in a state of projecting greatly in a cantilever manner. The front end side of the work deck 9 projecting greatly to one side is connected and strengthened by a wire 12 suspended from the arm 7 of the tower crane main body located above in order to ensure stability. As a result, the bending of the tip portion is suppressed, and it is possible to ensure the safety on the laying of the lifting work scaffolding apparatus having the work deck 9 that is greatly extended in one direction even if there is only one mast.

  In this case, it is a matter of course that the lifting / lowering of the lifting / lowering work scaffold device 3 formed by the lifting / lowering driving device is operated in conjunction with the expansion / contraction of the wire 12 from the arm 7 of the tower crane. In addition, in the structure of the lift drive unit 8, by adding a connection structure that allows the work deck 9 to rotate horizontally around the mast 2, the work deck 9 can also move 360 degrees horizontally around the mast 2. . At this time, it is natural that the rotational movement of the arm 7 of the tower crane is also operated in conjunction. Thereby, the close work using the projecting work deck on the wall surface of the building frame in the 360-degree horizontal direction with the mast 2 as the central axis is possible.

  The deck plate of the lifting work scaffold device needs a wide and long deck plate so as to construct a large structure. The entire deck plate of such a lifting type work scaffolding apparatus is hereinafter referred to as “main deck plate”. In this case, the main deck plate is configured to have a required length by connecting and connecting the deck plates 10 of the plurality of basic unit work decks 14. That is, the main deck plate is formed by connecting the deck plate 10 on the upper part of the work deck having a basic unit length. By connecting the basic unit work deck 14, the work deck 9 can be arbitrarily extended and extended. All of the work decks of the lifting work scaffold apparatus shown in FIGS. 1, 2, and 3 can be configured to have any desired length by connecting the basic unit work decks 14.

  By using the tower crane lifting and lowering work scaffolding device according to one embodiment of the present invention described above, in the construction work of a large structure rich in design, work on the wall surface of a deep part or a complicated structure part Construction work can be carried out safely and extremely easily by bringing the end of the deck 9 into close contact.

  FIG. 4 is a conceptual diagram showing a raising / lowering type lifting scaffold of a lifting / lowering working scaffold device of a tower crane. FIG. 4 shows a second embodiment of the lifting and lowering work scaffold device for a tower crane. The lifting / lowering work scaffold device 3 of the tower crane 1 according to the present invention shown in FIG. 4 has a lifting / lowering drive unit 8 inserted into the mast column 2 of the large tower crane 1 and connected to the lifting / lowering drive unit 8 to be integrated. The work deck 9 is driven and moved from the mast 2 and is fixed in a state where it is horizontally projected.

  In FIG. 4, the work deck 9 shown on the right side of the mast 2 is a view showing the case of the flip-up type lifting scaffold 4, and the work deck 9 shown on the left side of the mast 2 is the case of the flip-down type lifting scaffold 5. FIG.

  The lifting / lowering type lifting scaffolds 4 and 5 of the lifting / lowering working scaffold device 3 of the tower crane according to the present embodiment can be moved up and down to the lifting / lowering drive unit 8 along the mast 2 at one end of the work deck 9. Before the initial use, the work deck 9 is fixed to the lift drive unit 8 in a form parallel to the mast 2 in the vertical direction.

  In the lifting / lowering work scaffold device 3 for a tower crane according to the present embodiment, a work deck 9 laid on a lifting drive unit 8 is connected to one end of the lifting drive unit 8 and the other end is connected to the connection laying unit. The shaft is fixed by flipping up upwards until it becomes substantially horizontal, thereby forming a flip-up type lifting scaffold 4. Similarly, one end of the work deck 9 that is not connected to the lifting / lowering drive unit 8 is fixed by bouncing down on the connecting laying unit as an axis until it becomes substantially horizontal downward, thereby forming the lifting / lowering type lifting scaffold 5. .

  The lifting / lowering work scaffold device 3 of the tower crane according to the present embodiment remains in a vertical state in which the work deck 9 is in close contact with the lifting / lowering drive unit 8 in parallel when moving up and down along the mast 2 of the lifting / lowering work scaffold device. The mast column is moved up and down together with the lifting drive. Therefore, there is no fear of causing damage accidents by touching constructions when moving up and down. And when it moves up and down and reaches the desired work position height, the elevating drive unit 8 is fixed to the mast 2 by operating the stopper mechanism. Thereafter, the work deck 9 is fixed substantially horizontally by unfolding the lifting / lowering type lifting scaffold as described above. There is no restriction on whether to select a flip-up lifting platform or a lifting-down lifting platform. Moreover, even if both are present in the same lifting / lowering work scaffolding device, there is no problem in terms of the present technical idea.

  Regarding the drive mechanism for deploying the flip-up / bounce-down lift platform and fixing it substantially horizontally, for example, by using a drive mechanism such as a rack and pinion gear mechanism in the lift drive unit 8 and the deck lower structure 11 of the work deck 9. It can be driven up or down by electric or manual operation until it is substantially horizontal. Further, a screw shaft and worm gear mechanism or a pulley and wire mechanism may be used. In any case, any structure may be used as long as the tip of the support column pushed out by the mechanism is connected to the work deck at a certain angle to move the work deck up and down. These may be hydraulically driven and can be handled within the scope of the publicly known technology, and thus detailed description thereof is omitted. (Refer particularly to FIGS. 4, 5, and 6 of Patent Document 3.)

  According to the second embodiment of the tower crane lifting and lowering work scaffold device 3 according to the present invention, the work deck is not limited to a height as long as it is a wall surface of a high-rise building frame in the vicinity of the tower crane 1. Construction work can be carried out with 9 close to each other. If the work deck 9 is lightweight, the amount of drive energy used is small and can be easily moved. Further, if the work deck 9 is a connected body of the fixed basic unit work deck 14, the work deck 9 connected in advance until the required length is used as a lifting / falling-type lifting scaffold until the required length is obtained. It becomes possible to work more closely.

  The tower crane lifting and lowering work scaffold device 3 according to the present invention prevents deflection due to a load expected at the tip portion when the work deck 9 extends substantially horizontally in the second embodiment described above. It is not excluded that the reinforcing structure such as the support column 15 for supporting the three points is laid on the deck lower structure 11 in advance. Similarly, when the work deck 9 is extended substantially horizontally, the wire 12 from the mast 2 may be supported and reinforced as shown in FIG. Similarly, when the work deck 9 is projected substantially horizontally, the deflection due to the expected load at the tip is assumed in advance, and the angle at which the work deck 9 is projected is slightly upward from the horizontal. The correction setting is not excluded, and these techniques need only correspond within the scope of known techniques.

  Note that the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. These are all part of this technical idea.

  As described above, according to the invention according to the present application, in the construction work using the tower crane of the high-rise building, the safety and workability of the construction are remarkably improved, and the economic efficiency such as the shortening of the construction period is remarkably improved. It becomes possible to make it. Therefore, the present invention provides great benefits in the construction industry and other related industries, and even if the restrictions on safety laws and regulations in construction work are lifted, future industrial applicability will not be Very big.

1 Tower crane 2 Mast
DESCRIPTION OF SYMBOLS 3 Lifting type work scaffold apparatus 4 Bounce-up type lifting scaffold 5 Bounce-down type lifting scaffold 6 Base frame 7 Arm 8 Lifting drive part 9 Work deck 10 Deck plate 11 Deck lower structure 12 Wire 13 Handrail 14 Basic unit work deck 15 Support column

Claims (5)

Elevating drive unit that raises and lowers the mast column of the tower crane,
A work deck laid in connection with the elevating drive unit;
A power supply unit for supplying power to the elevating drive unit;
A control unit for controlling the lifting drive unit,
A tower crane lifting and lowering work scaffolding device, wherein the work deck is lifted and lowered along a mast column of the tower crane.   2. The tower crane elevating work scaffolding device according to claim 1, wherein the work deck is configured to be connected to the plurality of elevating drive units that elevate mast struts of the plurality of tower cranes.   2. The tower crane lifting and lowering work scaffolding device according to claim 1, wherein the work deck is fixed by suspending a protruding portion near the tip thereof by a wire from an arm of the tower crane.   One end of the work deck is connected to the elevating drive unit in a structure that is rotatable in a substantially vertical direction, and the other end is jumped up or down with the connection unit as an axis. 4. The tower crane lifting and lowering work scaffolding device according to claim 1 or 3, wherein the lifting and lowering scaffolding is formed substantially horizontally.   The raising / lowering drive unit for raising and lowering the mast column of the tower crane or the work deck has a connecting structure that can be moved substantially horizontally around the mast column as a rotation axis, and the projecting direction of the work deck is substantially horizontal. The tower crane lifting and lowering work scaffolding device according to any one of claims 1 to 4, characterized in that it is freely variable with respect to the tower crane.

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