JP4200076B2 - Cylindrical structure repair device - Google Patents

Description

  TECHNICAL FIELD The present invention relates to a cylindrical structure repairing device for repairing and refurbishing a cylindrical structure with a dome-shaped roof mounted on a cylindrical side wall for damage, deterioration, or other reasons. For example, it is suitable for repair work such as a PC water tank formed of prestressed concrete.

  A cylindrical structure of this type includes, for example, a disk-shaped bottom plate portion 2 and a cylindrical side wall portion 3 erected on the bottom plate portion 2, such as the PC water storage tank 1 shown in FIGS. Consists of a dome-like roof 4 that is installed on the upper end of the side wall 3 and assembles a temporary scaffold 5 around the outer side of the side wall 3 as shown in FIG. 1 and places a heavy machine 6 such as a large crane on the ground. Then, restoration work is performed on the outside of the side wall portion 3 and the roof portion 4 while unloading the equipment and materials and unloading the dismantled material.

  In addition, when performing repair work on the inside, the stored water is drained and emptied, and the existing ventilation tower 7 and the entrance / exit 8 for maintenance and inspection are removed or expanded to secure a passage from which heavy machinery 6 In addition to carrying equipment and materials into the interior, as shown in FIG. 2, while assembling the temporary scaffold 9 sequentially from the bottom plate portion 2 side to the roof portion 4 side, repair work on the inside of the side wall portion 3 and the roof portion 4, Perform repair work on piping and lifting equipment installed inside.

  However, in the case of the conventional restoration method as described above, the temporary scaffolds 5 and 9 are assembled using a large number of materials in any of the restoration work inside and outside the tank. In particular, when repairing the interior, equipment and materials are sequentially transferred from a limited passage through heavy equipment 6, and after completion of construction, temporary scaffolds 5 and 9 are dismantled and equipment and materials are passed through the passage. Since it is necessary to remove materials sequentially, it was difficult to improve the efficiency of repair work and the operating rate of heavy machinery 6.

  In addition, since the repair work inside the tank is impossible when it is in operation and the water is stored, the repair work will be carried out with the operation stopped and emptied. If it is nearby, there is no problem, or it is almost impossible to expect this situation, so a temporary storage tank is temporarily built nearby or distributed from a remote storage tank. In the former case, it would be more expensive, and in the latter case it would be inconvenient for the user of the water storage.

In order to solve these problems, proposals such as Patent Documents 1 to 4 have been made, but the problem has not yet been sufficiently solved as described below.
Utility Model Registration No. 2514106 JP-A-9-144302 JP-A-9-144303 JP 2002-362683 A

  In the case of Patent Document 1, a support column erected between the bottom side of the tank and the roof is provided in the center of the tank, a rotating frame is attached in the middle of the supporting column, and a work floor is fixed to the rotating frame. Yes, there is no need for a temporary scaffold assembled from the bottom as in the conventional construction method, but it is possible to repair the upper side wall and roof of the tank, but the lower side wall of the tank located below the work floor In order to prevent the water from being contaminated by the installation work of the support pillars and the water quality due to the installation work, the tank is emptied even in the repair work on the upper side wall and the inner surface of the roof. There were still issues that needed to be resolved, such as having to work in this state.

  In the case of Patent Document 2, a work floor is provided via a suspension means that is supported at the center of the roof portion and can be moved up and down and horizontally swiveled, and has a structure in which an expansion / contraction means for taking in and out the extension portion from the tip of the work floor is provided. Yes, there is no need for a temporary scaffold assembled from the bottom as in the conventional construction method, and even if the tank is not emptied, the internal repair work located above the water surface can be done, but all loads are passed through the suspension means. Since it is added to the roof part, it is necessary to pay attention to the load so as not to damage the roof part, and to pay attention to uneven load so that the work floor does not become unstable. There were still issues such as being unable to carry out restoration work to replace part of the building.

  In the case of Patent Document 3, a working scaffold having the same configuration as that of Patent Document 2 is provided, and a center pole (supporting column) for guiding the working scaffold is provided at the center of the tank. The temporary scaffold assembled from the bottom like the next construction method is not necessary, and the problem of uneven load as in Patent Document 2 does not occur, but by providing the center pole, the tank is emptied in the same manner as in Patent Document 1. There were still issues that needed to be solved, such as having to be installed in a state, and the work of installing and installing the support pillars could contaminate the water quality.

  In the case of Patent Document 4, the first temporary means for sealing the storage space above the stored water, the second temporary means for blocking fallen objects above the first temporary means, and the roof above the second temporary means. It is a structure with a suspension scaffold suspended from the section, and it can be repaired on the inner surface of the roof without making the tank empty and contaminating the water, but it cannot be repaired inside the tank. Because all the load on the suspension scaffold is applied to the roof, there are issues that need to be resolved, such as repair work for a roof part that is significantly damaged and repair work that replaces part of the roof. Was left.

  The present invention provides a restoration device for a cylindrical structure that can solve these problems of the prior art, and in particular, does not require a temporary scaffold assembled from the bottom as in the conventional construction method. It can be shortened, does not require a support column from the bottom to the roof as in Patent Document 1 or 3, and can perform repair work above the water surface without leaving the interior empty. The work scaffolding is not suspended from the roof as in 2 to 4, and it is possible to perform repair work that safely performs repair work without replacing the roof and replaces part of the roof. The main purpose is to make it possible to easily perform repair work on the outside of the roof and side walls.

  A cylindrical structure repairing apparatus according to the present invention is provided with a flat mounting surface formed in a ring shape on the top side of a side wall portion on which a dome-shaped roof portion is mounted, and the roof portion is provided on the mounting surface. A main lift device is rotatably provided in a surrounding manner, and an auxiliary lift device is provided at the center of the main lift device. A crane suspended from a horizontal traveling rail is attached to the main lift device, and the auxiliary lift device is installed. The lift device is characterized in that a lift column supporting a work scaffold installed inside a cylindrical structure is mounted so as to be capable of turning and moving up and down with respect to the main lift device.

  In this cylindrical structure restoration device, a corridor part or a tension ring or other structural part already provided on the top of the side wall of the cylindrical structure is used as a flat mounting surface formed in the ring shape. If there is no structural part that can be used, a flat mounting surface formed in a ring shape at the top of the side wall is newly adopted, and a gondola for exterior work is installed from the main beam of the main lift device. It is also possible to adopt a form in which a gondola for interior work is suspended so as to be able to be lifted and lowered from the work scaffold of the auxiliary lift device while being suspended so as to be liftable.

  According to the cylindrical structure repair device of the present invention, the crane for the main lift device can be used to easily perform repair work on the outside of the cylindrical structure including replacement of the roof portion, and the auxiliary lift device Using the work scaffold, the repair work on the inside of the cylindrical structure can be performed safely and easily and reliably, especially compared to the conventional repair method of building a temporary scaffold from the bottom plate side to the inside of the roof part. Since a large amount of materials, equipment, and workers are not required, the construction cost can be reduced and the construction period can be shortened. In addition, it is easy to repair the inside of the roof of a cylindrical structure that is in operation and has contents. Therefore, the economic loss due to the suspension of operation can be significantly reduced.

  Compared to the restoration device of Patent Document 1 or Patent Document 3 in which a support pillar standing from the bottom plate portion side and supporting the roof portion is provided in the center of the tank, and a temporary scaffold is assembled on a rotating frame attached to the support pillar. Patent document that suspends the work scaffold from the roof part of the tank while being able to perform the repair work without impairing the operating state because it is a form in which the equipment for repair is not mounted on the lower side of the structure Compared to the repair device of 2 or Patent Document 4, the repair work can be performed safely, easily and reliably without placing a load on the roof.

  Moreover, in this restoration apparatus, it is not necessary to prepare separate facilities for restoration on the inside and outside as in the conventional construction method and Patent Documents 1 to 4, and at the same time performing restoration work on the inside and outside of the roof and side walls. It is possible to carry out the repair work for exchanging a part of the roof part that cannot be carried out in particular in Patent Document 2 or 4, and it can be carried out using the main lift device and without using heavy equipment such as a large crane. It is possible to carry in and out heavy materials and equipment using the main lift device.

  In addition, when a form in which a corridor or tension ring or other structural part already installed on the top of the side wall of the cylindrical structure is used as a flat mounting surface formed in the ring shape is compared with a case where this is newly installed. The work cost can be reduced and the work period can be shortened. The exterior work gondola can be lifted and lowered from the main beam of the main lift device, and the interior work gondola can be lifted and lowered from the work platform of the auxiliary lift device. If the form which suspends as much as possible is taken, the repair operation | work with respect to the inside and outside of a side wall part will become easier.

  The cylindrical structure repair device of the present invention will be described in detail with reference to FIGS. 3 to 10 showing a preferred embodiment in which the present invention is applied to a PC water tank. The PC water tank 11 is shown in FIG. In addition, a disc-shaped bottom plate portion 12 provided on the foundation ground, a cylindrical side wall portion 13 erected on the bottom plate portion 12, and a dome-shaped roof portion 14 installed on the upper end of the side wall portion 13. The roof 14 is provided with a ventilation tower 15 at the center and a maintenance / inspection entrance 16 on the outer peripheral side. The top of the side wall 13 has a flat upper surface and is formed into a ring shape. A portion 17 is provided, and water 18 is stored inside the tank.

  In this repair device, a rotatable main lift device 19 is placed on the walkway portion 17 so as to surround the roof portion 14. The main lift device 19 has a large number of support members 20 erected on the walkway portion 17. A main beam (main beam) 21 connected to the upper end side of the column member 20 in a erected state, a horizontal traveling rail 22 supported by the main beam 21, and a crane 23 suspended from the horizontal traveling rail 22. A rotation driving means is provided between the lower end side of the column member 20 and the corridor 17 as will be described later with reference to FIG. 8 so that the entire main lift device 19 is rotated on the corridor 17 to a desired position. I have to.

  In the main lift device 19, the main beam 21 is reinforced by a lattice or other reinforcing member 24, and the main beam 21 is provided with a shaft hole portion 25 that is aligned with the ventilation tower 15. 5, an auxiliary lift device 26 is mounted. The auxiliary lift device 26 includes a lift column 27 and a work platform 28 mounted on the lower end side of the lift column 27. Although suspended in the water storage tank 11, it is provided with a plurality of working scaffolds 28A, 28B arranged radially from the axial center in the radial direction.

  The main lift device 19 is assembled on the ground, suspended and installed on the walkway portion 17 with a large crane or other heavy equipment, and a passage 29 that disassembles a part of the ventilation tower 15 using the crane 23 and aligns with the shaft hole portion 25. In addition, a temporary ventilation tower 30 with an openable / closable door is provided at the entrance 16 for maintenance and inspection. The temporary ventilation tower 30 replaces the ventilation tower 15 to ventilate the PC water tank 11 during the repair work. Do.

  As will be described later with reference to FIGS. 9 and 10, the auxiliary lift device 26 turns and lifts the upper end side of the lift column 27 via the swing and lift drive means provided at the center of the main beam 21 of the main lift device 19. In addition to being supported in a possible manner, the lift struts 27 are sequentially added to the upper end side by a necessary length so that they can be lowered onto the bottom plate portion 12 of the PC water storage tank 11.

  The work scaffolds 28A and 28B can be expanded and contracted, and the work scaffolds 28A and 28B can be folded in an umbrella shape with respect to the lower end side of the lift column 27. The work scaffolds 28A and 28B are shortened. After the lower end side of the lift column 27 is inserted into the PC water storage tank 11 from the passage 29, the umbrella is opened to bring the respective working scaffolds 28A, 28B into a horizontal state and pulled out to be in an extended state. Is fixed by a holding means 31 such as a rope or a wire.

  In addition, a trap 41 is attached to the lift column 27 in order to allow the operator to enter and exit and to deliver materials and equipment between the main beam 21 side of the main lift device 19 and the work scaffold 28 side of the auxiliary lift device 26. An opening / closing passage cover 42 is attached to the passage 29 formed in the center of the roof portion 14 so that the worker can move, and the passage cover 42 is opened so that the crane 23 It is possible to carry in and out materials and equipment using

  Next, the restoration work will be described with reference to FIGS. 6 and 7. The left half of FIG. 6 is a case where the water storage 18 is in the PC water storage tank 11, and in this case, the outside of the side wall portion 13 and the outside of the roof portion 14. In addition, the right half of FIG. 6 shows the case where there is no water storage 18 in the PC water storage tank 11, and in this case, the side wall portion can be repaired. It is possible to perform repair work including repair of the outside and inside of 13 and the outside and inside of the roof part 14, and replacement of the roof part 14, as well as repair work of piping and lifting equipment installed inside. It is.

  When carrying out the restoration work, if there is a water reservoir 18, the work scaffold 28 (28 </ b> A, 28 </ b> B) is used to stretch the shut-off sheet 32 held by a rope above the water surface, and the shut-off sheet A protective sheet 33 is stretched in a state of being spaced apart above 32 so as to prevent foreign matter from falling into the water and contaminating the water quality, or by providing an air blower pipe 34 or a temporary ventilation port 35 to store PC water. The working environment is improved by purifying the air in the tank 11.

  First, the repair work of the side wall part 13 is for the exterior work that uses the crane 23 suspended from the horizontal traveling rail 22 or is suspended from the main lift device 19 so as to be lifted up and down when it is directed to the outside of the side wall part 13. When the gondola 36 is used and the inner side of the side wall 13 is used, an interior work gondola 37 suspended from the work scaffold 28 of the auxiliary lift device 26 as shown in FIG. As described above, the operation can be performed using the crane 23 suspended from the horizontal traveling rail 22 or directly from the work scaffold 28 that can move up and down and turn.

  In repairing these side wall parts 13, for example, when repairing the outside of the side wall part 13, the gondola 36 for exterior work is moved up and down and the main lift device 19 is rotated to move the entire area outside the side wall part 13. When the inside of the side wall portion 13 is repaired, the inside of the side wall portion 13 is moved by moving the gondola 37 for interior work up and down and the auxiliary lift device 26 pivoting. It is possible to easily repair the entire area.

  Further, when repairing the inside of the side wall portion 13 and using the crane 23 suspended from the horizontal traveling rail 22, the crane 23 is moved up and down and the main lift device 19 is rotated and moved. In some cases, it is necessary to remove a part of the roof portion 14 above the restoration point. In this case, particularly heavy materials and equipment 40 are carried in or out, and an excessive load is applied to the work scaffold 28. It is desirable to do it only for repair work that you do not want to burden.

  When the inside of the side wall portion 13 is repaired and the work is directly performed on the work scaffold 28 (28A, 28B), the auxiliary lift device 26 is operated to move the work scaffold 28 up and down and turn. However, particularly in the case of a large diameter, in order to improve the work efficiency and reduce the uneven load due to each work scaffold 28, it is desirable to arrange a large number of work scaffolds 28 along the circumference, Further, by attaching a gripper that horizontally expands and contracts to the outer peripheral side of each work scaffold 28 and pressing and holding the extended gripper against the inner surface of the side wall portion 13, the work scaffold 28 is fixed. Furthermore, it is possible to adopt a stabilizing form.

  Next, the repair work of the roof portion 14 is performed using the temporary scaffold 38 assembled on the work scaffold 28 when the roof portion 14 is inside, and when the roof portion 14 is outside the horizontal portion, the horizontal running rail is used. However, the roof portion 14 is not only repaired at a deteriorated or damaged portion, but can be locally removed and replaced at a location where the deterioration or damage is significant. In particular, when a new concrete placement is performed, a curing sheet 39 can be stretched above the roof portion 14 as necessary, and the crane 23 can be attached even with heavy materials and equipment 40. Can be carried in or out.

  In repairing these roof portions 14, for example, when repairing the inside of the roof portion 14, the worker is moved to the work scaffold 28 via the trapping 41 provided on the lift column 27 and the passage cover 42 is attached. In the open state, materials and equipment are carried from the passage 29 to the work scaffold 28, and after the temporary scaffold 38 is assembled on the work scaffold 28, the auxiliary lift device 26 turns the work scaffold 28, Repair work is performed on the work scaffold 28.

  Further, when the outside of the roof portion 14 is repaired, a crane 23 suspended from the horizontal traveling rail 22 is used, or an exterior work gondola 36 suspended from the main lift device 19 so as to be lifted and lowered is used. However, because it is a form that does not load the roof, it is possible to perform repair work to replace a part of the roof that is significantly deteriorated or damaged, and materials and equipment necessary for these repair work The class 40 can be easily loaded and unloaded using the crane 23 without using heavy equipment such as a large crane even if it is a heavy object.

  FIG. 8 shows an example of a rotation driving means that allows the main lift device 19 to rotate on the walkway portion 17. The guide member 44 with the guide rail 43 mounted in an annular shape is connected via the anchor member 45 to the walkway portion 17. The lower end side of each column member 20 is connected to each other via an annular connecting member 46, and a driving wheel 47 that travels along the guide rail 43 is attached to the connecting member 46. The axle is connected to a drive motor 49 with a speed reducer via a timing belt, gears and other power transmission means 48.

  In addition, the rotation driving means is provided with a guide roller 50 that rolls along the inner surface of the guide member 44 on the inner surface of the connecting member 46 in order to stabilize traveling, and is connected to detect the traveling position. A position detection sensor 51 that slides along the outer surface of the guide member 44 is provided on the outer surface of the member 46, and the drive wheel 47 travels along the guide rail 43 when the drive motor 49 is rotated by remote control or the like. The entire main lift device 19 can be rotated and stopped at a desired position, and a handrail 52 is attached to the outside of the corridor 17.

  FIGS. 9 and 10 show an example of the turning and raising / lowering movement means of the auxiliary lift device 26 with respect to the main lift device 19, and a guide rail 53 is annularly provided at the center of the main beam 21 and along the guide rail 53. A pedestal portion 55 with a traveling drive wheel 54 attached to the bottom is placed, and a traction motor 55 with a speed reducer is attached to the pedestal portion 55 for swivel movement, between the drive motor 56 and the axle of the drive wheel 54. Are connected via a power transmission means 57.

  A drive motor 58 and a pinion 59 with a speed reducer are mounted on the main beam 21 for moving up and down, the drive motor 58 and the pinion 59 are connected by a timing belt and other power transmission means 60, and the lift column 27 A rack 61 that meshes with the pinion 59 is provided on the outer periphery of the pinion. Stopper cam members 62 and 63 that are in pressure contact with the lift column 27 are mounted on the upper and lower positions of the pinion 59.

  Furthermore, a stopper jack 64 that presses against the lift column 27 is attached to the pedestal 55, and a stopper receiving member 65 is provided on the upper portion of the pedestal 55, and is a stopper member that is locked to the stopper receiving member 65. 66 protrudes horizontally from the upper end side of the lift column 27.

  When turning and moving the working scaffold 28 via the lift column 27, the turning and lifting / lowering means extends the jack 64 for stopper and presses it against the lift column 27, as well as the pinion 59 and the cam member for the stopper. When the drive motor 56 with a speed reducer is driven to rotate when the 62 and 63 are separated from the lift column 27 and the drive wheel 54 travels along the guide rail 53, the gantry 55 and the lift column 27 rotate in conjunction with each other. The work scaffold 28 can be swung while moving.

  Further, when the work scaffold 28 is moved up and down via the lift column 27, the stopper jack 64 is shortened and pulled away from the lift column 27, and the pinion 59 is engaged with the rack 61 of the lift column 27, and When the cam members 62 and 63 for stopper are brought into pressure contact with the lift column 27 and the drive motor 58 with a speed reducer is rotationally driven, the guide rail 53 is moved up and down, so that the work scaffold 28 can be moved up and down. it can.

  In the repair device according to the above embodiment, the main lift device 19 is rotatably provided on the walkway portion 17 formed on the upper end side of the side wall portion 13 so as to surround the roof portion 14. By installing the crane 23 suspended from the rail 22, it is possible to easily perform repair work on the outside of the PC water tank 11 including replacement of the roof portion 14, and to install the PC water tank 11 inside. By providing the auxiliary lift device 26 that supports the scaffold 28 on the lift column 27 that can be turned and raised and mounted at the center of the main lift device 19, the side wall portion 13 and the roof portion regardless of the presence or absence of the water storage 18. The repairing operation for the inside of 14 can be performed safely, easily and reliably.

  In other words, unlike the conventional restoration method, unlike the case where a temporary scaffold is assembled from the bottom plate side to the inside of the roof portion, a large amount of materials, equipment, and workers are not required. It can be shortened, and the repair work on the inside of the roof part that is most susceptible to deterioration and damage in the PC water tank due to the effect of gas generated from chlorine added to the water for sterilization etc. However, since it can be carried out easily, the economic loss due to the suspension of operation can be significantly reduced.

  Moreover, like the repair apparatus of patent document 1 or patent document 3, the support pillar which stands from the baseplate part side and supports a roof part is provided in the center of a tank, and a temporary scaffold is assembled on the rotation frame attached to the support pillar. Unlike the case, since the repair facility is not installed on the lower side of the tank, it is possible to perform repair work by installing the repair facility even in a reservoir tank. There is no risk of contaminating water.

  Further, unlike the case of the repair device of Patent Document 2 or Patent Document 4, unlike the case where the work scaffold is suspended from the roof portion of the tank, the work scaffold is provided on the auxiliary lift device 26 suspended from the main lift device 19. Therefore, the repair work can be performed safely, easily and reliably without burdening the roof with a load.

  Moreover, in the case of any of the repair devices of Patent Documents 1 to 4, when repair work is performed on the outside of the roof portion and the side wall portion, it is necessary to prepare a separate repair facility. In particular, in the case of Patent Document 2 or 4, it is not possible to perform a repairing operation such as exchanging a part of the roof portion. However, the repairing apparatus according to the above embodiment does not require a separate repairing facility. The main lift device 19 can perform a repair work for the exterior of the roof and side walls and a repair work for exchanging a part of the roof.

  The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the gist. For example, in the illustrated embodiment, the center of the PC water tank 11 is used as the work scaffold 28. The two working scaffolds 28A and 28B extend in the radial direction, but it is possible to adopt a form in which three or more working scaffolds are provided, and the main lift device 19 is driven to rotate. As the mechanism and the drive mechanism that turns and moves the auxiliary lift device 26 up and down, various well-known drive mechanisms that function similarly can be applied.

  Further, in the illustrated embodiment, the main lift device 19 is rotatably installed on the walkway portion 17 using the walkway portion 17 also serving as a tension ring formed on the top of the side wall portion 13. If one or both of them have a cylindrical structure formed independently and a ring-shaped mounting surface with a certain width formed on the top of the side wall other than the corridor and tension ring, these are used. Thus, it is possible to adopt a form in which the main lift device 19 is installed. If there is no appropriate ring-shaped mounting surface, the main lift device 19 is newly constructed on the top of the side wall and used.

  In the illustrated embodiment, the restoration device for implementing the PC water tank as a cylindrical structure has been described. However, in addition to the PC water tank, for example, a storage tank such as city gas or LPG gas, a stadium or a ball game field The repair device according to the present invention can be applied to various cylindrical structures having a dome-shaped roof portion, such as a structure with a dome roof.

It is explanatory drawing which applied the restoration construction method of the cylindrical structure by a conventional construction method to PC water storage tank, Comprising: The embodiment at the time of the water storage operation of PC water storage tank is shown. It is explanatory drawing which applied the restoration construction method of the cylindrical structure by a conventional construction method to PC water storage tank, Comprising: The embodiment at the time of the water storage suspension of PC water storage tank is shown. It is explanatory drawing which applied the restoration | repair apparatus of the cylindrical structure by this invention to PC water storage tank, Comprising: Embodiment which mounted | maintained the main lift apparatus rotatably on the corridor part is shown. 4 shows an embodiment in which an auxiliary lift device is mounted on the main lift device of FIG. 5 shows an embodiment in which the auxiliary lift device of FIG. 4 is installed in a PC water storage tank. It is explanatory drawing of the repair construction method performed using the main / auxiliary lift apparatus of FIG. 5, Comprising: The left half shows embodiment at the time of water storage operation, and the right half shows embodiment at the time of water storage stop. The whole explanatory drawing of the repair construction method performed using the main / auxiliary lift apparatus of FIG. 5 is shown. Explanatory drawing of the rotation drive means which enables the main lift apparatus to rotate is shown. The explanatory view of the turning drive means which makes the auxiliary lift device turnable is shown. Explanatory drawing of the raising / lowering drive means which enables the auxiliary lift apparatus to move up and down is shown.

Explanation of symbols

11 PC water storage tank (cylindrical structure)
12 Bottom plate part 13 Side wall part 14 Roof part (dome-shaped roof)
15 Ventilation tower 16 Entrance / exit 17 (for maintenance and inspection) Walkway (ring-shaped mounting surface)
18 Water storage 19 Main lift device 20 Strut member 21 Main beam (main beam)
22 Horizontal traveling rail 23 Crane 24 Reinforcement member 25 Shaft hole portion 26 Auxiliary lift device 27 Lift column 28, 28A, 28B Working scaffold 29 Passage 30 Temporary ventilation tower 31 Holding means 32 Water shielding sheet 33 Protection sheet 34 Air blower pipe 35 Temporary ventilation openings 36, 37 Gondola 38 Temporary scaffolding 39 Curing sheet 40 Materials and equipment 41 Trapping 42 Passage cover

Claims (3)

  A flat mounting surface formed in a ring shape is provided on the top side of the side wall portion on which the dome-shaped roof portion is mounted, and the main lift device can be rotated and moved on the mounting surface in a manner surrounding the roof portion. An auxiliary lift device is provided at the center of the main lift device, and a crane suspended from a horizontal traveling rail is mounted on the main lift device, and the auxiliary lift device is installed inside a cylindrical structure. An apparatus for repairing a cylindrical structure, wherein a lift column supporting a working scaffold is mounted so as to be capable of turning and moving up and down with respect to the main lift device.   The cylindrical structure restoration device according to claim 1, wherein a stairway portion or a tension ring or other structural portion already provided on the top of the side wall of the cylindrical structure is used as a flat mounting surface formed in the ring shape. .   The gondola for exterior work is suspended from the main beam of the main lift device so that it can be raised and lowered, and the gondola for interior work is suspended from the work scaffold for the auxiliary lift device so that it can be raised and lowered. Repair device for cylindrical structures.

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