Chimney repair device and chimney repair method

Abstract

To shorten working time required for repairing a chimney.SOLUTION: A chimney repair device is equipped with a gondola which can be raised and lowered inside a chimney and on which equipment and materials used for repair work can be mounted, and a raising and lowering mechanism for raising and lowering the gondola. The gondola can be mounted by replacing a plurality of jetting mechanisms including a high-pressure water jetting mechanism for jetting high-pressure water to the inner peripheral surface of the chimney and a concrete jetting mechanism for jetting concrete to the inner peripheral surface.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present disclosure relates to a chimney repair device and a chimney repair method. [Background technology]

[0002] When repairing the inside of a chimney, a known method involves assembling a gondola that can carry the equipment and workers used in the repair work, placing the gondola inside the chimney, and having the workers perform the repairs while raising and lowering the gondola (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 9-250249 Summary of the Invention [Problem to be solved by the invention]

[0004] When repairing the inside of such a chimney, it is necessary to shorten the time required for the repair work.

[0005] The present disclosure has been made in consideration of the above, and aims to provide a chimney repair device and a chimney repair method that can shorten the work time required for chimney repair. [Means for solving the problem]

[0006] The chimney repair device according to the present disclosure comprises a gondola that can move up and down inside the chimney and that can carry equipment used in the repair work, and a lifting mechanism that raises and lowers the gondola, and the gondola can be fitted with a number of interchangeable injection mechanisms, including a high-pressure water injection mechanism that injects high-pressure water onto the inner circumferential surface of the chimney and a concrete injection mechanism that injects concrete onto the inner circumferential surface.

[0007] The chimney repair method according to the present disclosure includes the steps of: placing a gondola, which has a removably attached high-pressure water injection mechanism on the lowest floor and which injects high-pressure water onto the inner peripheral surface of a chimney having a structure in which a metal structure is arranged on the inner periphery of a cylindrical barrel steel plate and the metal structure is covered with a concrete lining layer, inside the chimney; and, while the gondola is being lowered, spraying high-pressure water onto the inner peripheral surface with the high-pressure water injection mechanism to peel off the concrete lining layer on the inner peripheral surface, removing the metal structure exposed by the peeling, and laying a new metal structure on the inner peripheral surface of the barrel steel plate from which the metal structure has been removed, on a floor above the lowest floor. the step of lowering the gondola to the bottom of the chimney, removing the high-pressure water injection mechanism from the lowest level of the gondola, and attaching to the lowest level of the gondola a concrete injection mechanism that injects concrete onto the inner surface of the chimney; the step of raising the gondola with the concrete injection mechanism attached to the lowest level to the top of the new metal structure inside the chimney with the metal structure arranged on the inner circumference of the barrel steel plate; and the step of using the concrete injection mechanism to inject concrete so as to cover the barrel steel plate and the new metal structure while lowering the gondola, thereby forming a new concrete lining layer. [Effects of the Invention]

[0008] According to the present disclosure, it is possible to shorten the work time required to repair a chimney. [Brief explanation of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram schematically illustrating an example of a chimney repair device according to this embodiment. [Figure 2] FIG. 2 is a diagram showing an example of a time chart in the chimney repair method according to this embodiment. [Figure 3] FIG. 3 is a diagram showing a chimney repair device according to a modified example. [Figure 4] FIG. 4 is a diagram showing a chimney repair device according to a modified example. [Figure 5] FIG. 5 is an enlarged view of a portion of the injection device. [Figure 6] FIG. 6 is a diagram showing an injection device according to a modified example. [Figure 7] FIG. 7 is a diagram showing an example of another mode of use of the chimney repair device. [Figure 8] FIG. 8 is a diagram showing another example of a concrete injection mechanism. [Figure 9] FIG. 9 is a diagram showing another example of a time chart in the chimney repair method. [Figure 10] FIG. 10 is a diagram showing a chimney repair device according to a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0010] Hereinafter, embodiments of a chimney repair device and a chimney repair method according to the present disclosure will be described with reference to the drawings. Note that the present invention is not limited to these embodiments. Furthermore, the components in the following embodiments include those that are easily replaceable by those skilled in the art, or those that are substantially identical.

[0011] Fig. 1 is a diagram schematically illustrating an example of a chimney repair device 100 according to this embodiment. The chimney repair device 100 shown in Fig. 1 is used when repairing the inside of a chimney 101. The chimney 101 in this embodiment has, for example, a cylindrical body steel plate 102 centered on a central axis AX along the vertical direction, a metal structure 103 such as a stud bolt or wire mesh arranged on the inner circumferential surface of the body steel plate 102, and a concrete lining layer 104 arranged to cover the metal structure 103.

[0012] The chimney repair device 100 shown in FIG. 1 includes a gondola 10 and a lifting mechanism 20. The gondola 10 is formed to a size that can be placed inside the chimney 101, and is provided so that it can be raised and lowered inside the chimney 101 by the lifting mechanism 20. The lifting mechanism 20 includes a hanging member 21, such as a rope, for suspending the gondola 10, and a hanging drive mechanism (not shown) for winding and unwinding the hanging member 21. The hanging drive mechanism (not shown) may be provided in the gondola 10 or on the ground. The gondola 10 is provided with multiple levels in the vertical direction. The gondola 10 includes a shaft member 11, an injection level 12, a first working level 13, a second working level 14, and a ceiling portion 15.

[0013] The shaft member 11 is provided so as to span multiple stories in the vertical direction along the central axis AX1 of the gondola 10. In this embodiment, the gondola 10 is suspended with the central axis AX1 parallel to the central axis AX of the chimney 101.

[0014] The jetting level 12 is located on the lowest level of the gondola 10. On the jetting level 12, a high-pressure water jetting mechanism 30 is attached to the inner peripheral surface 101a of the chimney 101. The high-pressure water jetting mechanism 30 is removably attached to the jetting level 12. Examples of the high-pressure water jetting mechanism 30 include a high-pressure water jetting mechanism that jets high-pressure water, a concrete jetting mechanism that jets concrete, etc. In this case, the jetting level 12 is equipped with a jetting mechanism that includes, for example, a high-pressure water jetting mechanism and a concrete jetting mechanism in an exchangeable manner. In the example shown in Figure 1, a configuration in which a high-pressure water jetting mechanism 30 is attached as the jetting mechanism will be described.

[0015] The high-pressure water jetting mechanism 30 has a connecting portion 31, a rod portion 32, a jetting head 33, and a supply flow path 34. The connecting portion 31 is a portion that is connected to the jetting level 12. The connecting portion 31 is connected to a swiveling mechanism 40 that is arranged on the jetting level 12. The swiveling mechanism 40 will be described later. The rod portion 32 extends from the connecting portion 31 in a direction perpendicular to the central axis AX1. The rod portion 32 is, for example, linear and passes through the central axis AX1. The rod portion 32 is formed, for example, in a cylindrical or columnar shape.

[0016] The spray heads 33 are provided on both ends of the rod portion 32 and are arranged facing opposite sides of the central axis AX1. The spray heads 33 spray high-pressure water in opposite directions toward the inner circumferential surface 101a of the chimney 101. Therefore, when high-pressure water is sprayed from the spray heads 33, the generation of rotational moment about the central axis AX1 is suppressed, and the reaction force when the high-pressure water is sprayed can be canceled out. In addition, by tilting the direction of the spray heads 33 in the rotation direction, the high-pressure water spray mechanism 30 may generate a moment about the central axis AX1, thereby assisting the rotation of the gondola 10.

[0017] The supply flow path 34 is, for example, a flexible high-pressure hose or a steel pipe, and passes high-pressure water to be supplied to the injection head 33. The supply flow path 34 is connected to a turning mechanism 40, which will be described later.

[0018] The swivel mechanism 40 rotates the high-pressure water jetting mechanism 30 around the central axis AX relative to the gondola 10. The swivel mechanism 40 is disposed at the bottom of the shaft member 11. The swivel mechanism 40 includes a rotating shaft 41 and a drive mechanism (not shown) that rotates the rotating shaft 41. The rotating shaft 41 is formed, for example, in a cylindrical shape. The supply passage 34 is inserted into one end, for example, the lower end, of the rotating shaft 41. In this case, for example, the upper end of the rotating shaft 41 may be connected to a water supply source, and the supply passage 34 may be connected to the interior of the rotating shaft 41, thereby connecting to the water supply source via the rotating shaft 41. With this configuration, the swivel mechanism 40 can supply water to each jetting head 33 while rotating the high-pressure water jetting mechanism 30. The water supply source may be disposed, for example, outside the chimney 101 on the ground.

[0019] The first work level 13 is located above the injection level 12. The first work level 13 has a first floor section 13F. The first floor section 13F is shaped to fit the inner circumference of the chimney 101, and in this embodiment is, for example, disk-shaped. The first floor section 13F can be equipped with equipment used for repair work inside the chimney 101, and allows workers performing the repair work to pass through. In this embodiment, the first work level 13 is equipped with equipment used for removal work to remove the metal structure 103, and various measuring instruments for measuring the inner surface 101a of the chimney 101.

[0020] The second work level 14 is located above the first work level 13. The second work level 14 has a second floor 14F. Like the first floor 13F, the second floor 14F has a shape that conforms to the inner circumference of the chimney 101, and in this embodiment, is, for example, disc-shaped. FIG. 1 illustrates an example in which the second floor 14F is formed to have the same or nearly the same diameter as the first floor 13F, but this is not limiting. For example, the second floor 14F and the first floor 13F may have different diameters. The second floor 14F can accommodate equipment used for repair work inside the chimney 101, and allows workers performing the repair work to pass through. In this embodiment, the second work level 14 is equipped with equipment used for placement work to place a new metal structure 103 and equipment used for lining layer formation work to form a new concrete lining layer 104.

[0021] The ceiling portion 15 is disposed on the upper level of the second working level 14. A guide roller 15a that rolls along the inner peripheral surface 101a of the chimney 101 is disposed on the ceiling portion 15. The guide roller 15a is provided so as to be movable in the radial direction. Therefore, the guide roller 15a can roll along the inner peripheral surface 101a while changing its position depending on the positional relationship between the ceiling portion 15 and the inner peripheral surface 101a.

[0022] Next, an example of a chimney repair method for repairing a chimney 101 using the chimney repair device 100 configured as described above will be described. First, the gondola 10 is assembled at the bottom of the chimney 101, and then the gondola 10 is raised to the top of the target portion of the chimney 101. Thereafter, the gondola 10 is lowered by the lifting mechanism 20, while the following operations are performed in order.

[0023] First, the concrete lining layer 104 on the inner peripheral surface 101a of the chimney 101 is peeled off (peeling process). Next, the metal structure 103 exposed by the peeled concrete lining layer 104 is removed (metal removal process). Next, a new metal structure 103 is placed on the inner peripheral surface of the barrel steel plate 102 from which the metal structure 103 has been removed (metal placement process). Next, a new concrete lining layer 104 is formed to cover the newly placed metal structure 103 (lining formation process).

[0024] In this embodiment, the above-mentioned peeling process is performed by spraying high-pressure water onto the inner circumferential surface 101a using the high-pressure water spraying mechanism 30 on the jetting level 12 of the gondola 10. The peeling process peels off the concrete lining layer 104, exposing the metal structure 103. As the gondola 10 descends while the peeling process is being performed, the first working level 13 reaches the height position of the exposed portion of the metal structure 103.

[0025] When the first work level 13 reaches the height position of the exposed portion of the metal structure 103, a worker performs the metal removal process on the first work level 13. In the metal removal process, the exposed portions of the metal structure 103 formed in the peeling process are sequentially removed. The metal removal process forms a removed portion of the metal structure 103 on the inner circumference of the barrel steel plate 102. As the gondola 10 descends while the metal removal process is being performed, the second work level 14 reaches the height position of the removed portion of the metal structure 103.

[0026] When the second work level 14 reaches the height position of the portion of the metal structure 103 to be removed, the above-mentioned metal placement process is carried out by a worker on the second work level 14. In this metal placement process, the metal structure 103, such as a wire mesh, is laid on the inner circumferential surface of the barrel steel plate 102 by welding or the like. For example, the worker can lay the metal structure 103 clockwise or counterclockwise relative to the shaft member 11 on the second level 14.

[0027] Furthermore, on the second work level 14, the above-mentioned lining forming process is carried out on the portion where the new metal structure 103 has been laid. That is, on the second work level 14, the laying of the new metal structure 103 and the formation of the new concrete lining layer 104 are carried out in that order. In the lining layer forming process, concrete is sprayed in the same direction as the metal placing process, so as to follow the portion where the metal structure 103 has been laid in the metal placing process.

[0028] The metal removal process, metal placement process, and lining formation process can be performed at positions offset around the axis from the position where the injection head 33 is disposed, as viewed from the axial direction of the central axis AX1. This makes it possible to mitigate the effects of the spray of high-pressure water injected from the injection head 33.

[0029] In this way, while the gondola 10 is descending, the stripping process is carried out on the lowest injection level 12, the metal removal process is carried out on the first working level 13 above the injection level 12, and the metal placement process and lining formation process are carried out in sequence on the second working level 14 above the first working level 13. This allows the stripping process, metal removal process, metal placement process and lining formation process to be carried out in parallel.

[0030] Fig. 2 is a diagram showing an example of a time chart for the chimney repair method according to this embodiment. As shown in Fig. 2, in the chimney repair method according to this embodiment, the gondola 10 is configured with multiple levels, and the peeling process, metal removal process, metal placement process, and lining formation process are performed in parallel, thereby making it possible to shorten the overall work time.

[0031] In other words, of the four types of work processes described above, the time T1 required for the stripping process on the injection level 12 is the longest. Time T1 is longer than time T2 required for the metal removal process, and is also longer than the total time T3 + T4 required for the metal placement process and the lining layer formation process. Therefore, by performing the stripping process on one level (injection level 12), the metal removal process on the first work level 13, and the metal placement process and lining layer formation process on the second work level 14, it is possible to perform other processes (metal removal process, metal placement process, lining layer formation process) in parallel with the stripping process.

[0032] As described above, the chimney repair device 100 of this embodiment comprises a gondola 10 that can move up and down inside the chimney 101, and a lifting mechanism 20 that raises and lowers the gondola 10. The gondola 10 has the lowest injection level 12 in the vertical direction on which a high-pressure water injection mechanism 30 that sprays high-pressure water onto the inner surface 101a of the chimney 101 is mounted, and a first work level 13 and a second work level 14 that are arranged in multiple levels in the vertical direction above the injection level 12 and can be equipped with equipment used for repair work inside the chimney.

[0033] The chimney repair method according to the present disclosure includes the steps of placing a gondola 10 inside a chimney 101 having a structure in which a metal structure 103 is arranged on the inner periphery of a cylindrical steel body plate 102 and the metal structure 103 is covered with a concrete lining layer 104, and placing the gondola 10 inside the chimney 101. The gondola 10 has a vertically lowest injection level 12 on which a high-pressure water injection mechanism 30 for injecting high-pressure water onto the inner periphery of the chimney 101 is mounted, and a first work level 13 and a second work level 14 arranged in multiple levels vertically above the injection level 12 and capable of carrying equipment used in repair work inside the chimney 101. While the steel plate 102 is being lowered, the following steps are sequentially performed: a step of spraying high-pressure water onto the inner surface 101a using the high-pressure water spraying mechanism 30 to peel off the concrete lining layer 104 on the inner surface 101a; a step of removing the metal structure 103 exposed by the peeling on the first work level 13 and the second work level 14 while the peeling is being performed using the high-pressure water spraying mechanism 30; a step of placing a new metal structure 103 on the inner circumference of the steel plate 102 from which the metal structure 103 has been removed; and a step of forming a new concrete lining layer 104 to cover the new metal structure 103.

[0034] Therefore, the stripping process on the injection level 12 and the metal removal process, metal placement process, and lining layer formation process on the first work level 13 and second work level 14 can be carried out in parallel, thereby shortening the overall work time required to repair the chimney.

[0035] In the chimney repair device 100 according to this embodiment, the gondola 10 has a swivel mechanism 40 that rotates the high-pressure water jetting mechanism 30. Therefore, the object to be jetted by the high-pressure water jetting mechanism 30 can be jetted uniformly in the circumferential direction of the inner peripheral surface 101a of the chimney 101.

[0036] In the chimney repair device 100 according to this embodiment, the high-pressure water jetting mechanism 30 is provided on the lowest floor in the vertical direction of the gondola 10. Therefore, when carrying out repair work, the gondola 10 can be lowered and work can be carried out from the lowest floor to the upper floors of the gondola 10.

[0037] In order to suppress interference between the inner peripheral surface 101a of the chimney 101 and the high-pressure water jetting mechanism 30, the chimney repair device 100 can be configured as follows, for example.

[0038] Figure 3 is a diagram showing a chimney repair device according to a modified example. The chimney repair device 100A shown in Figure 3 differs from the above embodiment in the configuration of the jetting level 12 of the gondola 10A, but the other configurations are the same as those of the above embodiment. The following mainly describes the differences. The gondola 10A has a high-pressure water jetting mechanism 30A attached to the jetting level 12. The high-pressure water jetting mechanism 30A has a hanging member 31A, a base portion 32A, a jetting head 33, a supply flow path 34, and a supply device 35.

[0039] The hanging member 31A is attached to the shaft member 11 of the gondola 10A. The base portion 32A is hung from the hanging member 31A. The spray head 33 is attached to the radial end of the base portion 32A. The supply flow path 34 supplies water, which is the object to be sprayed, to the spray head 33. The supply device 35 is provided on the base portion 32A and sends water to the supply flow path 34.

[0040] In this embodiment, when setting the dimensions of the high-pressure water jetting mechanism 30A, let DG be the representative diameter of the gondola 10A, DW be the representative diameter of the high-pressure water jetting mechanism 30A, H be the vertical distance between the representative point of the gondola 10A and the representative point of the high-pressure water jetting mechanism 30A, and θ be the angle between the central axis AX2 of the shaft member 11 and the central axis AX of the chimney 101. DG>DW+2·H·tanθ Set the values of DW and H so that

[0041] When the dimensions of the high-pressure water injection mechanism 30A are set as described above, for example, by making the dimensions of the gondola 10A so that it does not interfere with the inner surface 101a of the chimney 101, interference between the high-pressure water injection mechanism 30A and the inner surface 101a of the chimney 101 can be prevented.

[0042] Figure 4 is a diagram showing a chimney repair device according to a modified example. The chimney repair device 100B shown in Figure 4 differs from the above embodiment in the configuration of the jetting level 12 of the gondola 10B, but the other configurations are the same as those of the above embodiment. The following mainly describes the differences. The gondola 10B has a high-pressure water jetting mechanism 30B attached to the jetting level 12. The high-pressure water jetting mechanism 30B has multiple telescopic link mechanisms 31B, a base portion 32B, a jetting head 33, a supply flow path 34, a supply device 35, a connecting pipe 36, and a contact prevention mechanism 37.

[0043] The upper end of the telescopic link mechanism 31B is connected to the first floor 13F of the gondola 10B, and the lower end is connected to the base 32B. The telescopic link mechanism 31B can be extended and retracted in the longitudinal direction by a control unit (not shown). At least three telescopic link mechanisms 31B are provided around the first floor 13F, for example. The multiple telescopic link mechanisms 31B form a parallel link mechanism with degrees of freedom about three translational axes (vertical and horizontal) and two rotational axes (horizontal). The base 32B is suspended from the telescopic link mechanism 31B. The spray head 33 is attached to the radial end of the base 32B. Figure 5 is an enlarged view of a portion of the high-pressure water spray mechanism 30B.

[0044] The supply flow path supplies water, which is the object to be sprayed, to the spray head 33. The supply device is provided on the base portion 32B, and sends water to the supply flow path . The connection pipe supplies water to the supply device .

[0045] The contact restriction mechanism 37 restricts the high-pressure water jetting mechanism 30 from contacting the inner circumferential surface 101a when the gondola 10B is disposed inside the chimney 101. As shown in FIG. 5, the contact restriction mechanism 37 includes a rolling portion 37a, a support portion 37b, a drive portion 37c, and a control portion 37d. The rolling portion 37a is provided in contact with the inner circumferential surface 101a of the chimney 101 so as to be able to roll. For example, while in contact with the inner circumferential surface 101a, the rolling portion 37a is rotatable in a direction along the circumferential surface of the inner circumferential surface 101a, a direction along the vertical direction of the inner circumferential surface 101a, and a combined direction of these. The support portion 37b supports the rolling portion 37a so that it can roll. The support portion 37b may be rotatable around an axis parallel to the diameter of the chimney 101. The drive portion 37c adjusts the amount of protrusion of the support portion 37b. The driving unit 37c has a detector that adjusts the amount of protrusion of the support unit 37b. Examples of such driving units 37c include, but are not limited to, air cylinders or hydraulic cylinders equipped with stroke meters. The rolling units 37a, support units 37b, and driving units 37c are arranged, for example, four at 90° intervals around the central axis AX3 of the high-pressure water jetting mechanism 30B.

[0046] Each drive unit 37c transmits the detection results of the detection units to the control unit 37d. The control unit 37d adjusts the extension / retraction state of the telescopic link mechanism 31B so that the protrusion amount transmitted from the drive unit 37c matches a preset value. In this case, the control unit 37d adjusts the extension / retraction state of the telescopic link mechanism 31B so that the injection direction of the injection target in the high-pressure water injection mechanism 30 is perpendicular to the central axis AX of the chimney 101 and the distance between the injection head 33 and the inner circumferential surface 101a of the chimney 101 becomes a preset value. This configuration prevents interference between the high-pressure water injection mechanism 30B and the inner circumferential surface 101a of the chimney 101.

[0047] 5, the spray head 33 may be configured to be adjustable in distance from the inner circumferential surface 101a and in spray angle with respect to the inner circumferential surface 101a under the control of the control unit 37d. This configuration allows the position and attitude of the spray head 33 to be controlled, thereby preventing interference between the high-pressure water spraying mechanism 30B and the inner circumferential surface 101a of the chimney 101. Furthermore, by directly controlling the position and attitude of the spray head 33, the spray direction of the spray target can be adjusted with high precision. In a configuration in which the position and attitude of the spray head 33 are controlled by the control unit 37d, the rolling unit 37a, the support unit 37b, and the drive unit 37c may be arranged in multiple locations around the spray head 33, for example, one above and one below the spray head 33, and one on each side of the inner circumferential surface 101a in the circumferential direction of the spray head 33. In this case, the control unit 37d can calculate the tilt angle with respect to the up-down direction from the difference in detection results of the drive units 37c arranged above and below the ejection head 33 and the inter-detection distance (the distance between the rolling units 37a). The control unit 37d can also calculate the distance between the ejection head 33 and the inner circumferential surface 101a based on the average value of the detection results of the drive units 37c arranged above and below the ejection head 33. The control unit 37d can also calculate the tilt angle with respect to the circumferential direction based on the difference in detection results of the drive units 37c arranged on one side and the other side of the inner circumferential surface 101a with respect to the ejection head 33 and the inter-detection distance (the distance between the rolling units 37a). The control unit 37d can also calculate the distance between the ejection head 33 and the inner circumferential surface 101a based on the average value of the detection results of the drive units 37c arranged on one side and the other side of the inner circumferential surface 101a with respect to the ejection head 33. The control unit 37d can control the position and attitude of the ejection head 33 so that the obtained tilt angles become 0 and the obtained distances become predetermined distances.

[0048] The control target of the control unit 37d may include at least one of the telescopic link mechanism 31B and the ejection head 33.

[0049] The above control by the control unit 37d can be applied, for example, when the gondola 10B is placed inside the chimney 101 and position adjustment work with respect to the inner circumferential surface 101a is performed before the actual repair work is performed. This allows the repair work to be started with the position of the high-pressure water jetting mechanism 30 and the inner circumferential surface 101a properly set.

[0050] The control by the control unit 37d can also be applied to, for example, adjusting the position of the gondola 10B and the inner peripheral surface 101a while repair work is actually being performed. This allows the position of the high-pressure water jetting mechanism 30 and the inner peripheral surface 101a to be properly maintained even during repair work.

[0051] 4 and 5, the configuration in which detection is performed by the driving unit 37c while the rolling unit 37a is in contact with the inner circumferential surface 101a has been described as an example, but the present invention is not limited to this. For example, a non-contact type detecting unit capable of detecting the protrusion amount of the support unit 37b may be provided instead of or in addition to the rolling unit 37a and the driving unit 37c.

[0052] Fig. 6 is a diagram showing a spraying device according to a modified example. In the high-pressure water spraying mechanism 30B shown in Figs. 4 and 5, the drive unit 37c detects the protrusion amount of the support unit 37b and adjusts the position and attitude of the spray head 33 based on the detection results. However, this is not limiting. The high-pressure water spraying mechanism 30C shown in Fig. 6 includes a connecting unit 31C, a rod unit 32C, a spray head 33C, a supply flow path 34, and an adjustment mechanism 38. The configurations of the connecting unit 31C, the rod unit 32C, and the spray head 33C are the same as those of the connecting unit 31, the rod unit 32, and the spray head 33 of the above embodiment.

[0053] The adjustment mechanism 38 has a swing arm 38a and a rolling portion 38b. The swing arm 38a is supported on the rod portion 32 by a support portion 38c. The swing arm 38a is supported so as to be swingable about a central axis 38d that is perpendicular to the extension direction and the up-down direction of the rod portion 32. The swing arm 38a is provided in a state of protruding vertically from the support portion 32c. An upper portion of the swing arm 38a is bent radially outward from the high-pressure water jetting mechanism 30C. A rolling portion 38b is rotatably supported at the tip of this bent portion. In addition, a lower portion of the swing arm 38a is connected to the rod portion 32 by a spring member 38e. The spring member 38e applies elastic force to the swing arm 38a in a direction that presses the rolling portion 38b against the inner circumferential surface 101a of the chimney 101.

[0054] The swing arm 38a swings about the central axis 38d due to the displacement of the rolling portion 38b. The swing arm 38a supports the ejection head 33C. The swing arm 38a swings, changing the position and posture of the ejection head 33C supported by the swing arm 38a.

[0055] In this way, the position and posture of the injection head 33C can be changed in conjunction with the displacement of the rolling part 38b and the swinging of the swing arm 38a, so that interference between the injection head 33C and the inner surface 101a can be suppressed in the environment inside the chimney 101 without using detection equipment such as sensors.

[0056] Fig. 7 is a diagram showing another example of how the chimney repair device 100 can be used. While the above chimney repair devices have been described using examples in which a high-pressure water injection mechanism 30 is attached to the injection level 12, the present invention is not limited to this. As shown in Fig. 7, the chimney repair device 100 can perform repair work with a concrete injection mechanism 50 attached instead of the high-pressure water injection mechanism 30.

[0057] The concrete injection mechanism 50 has a water supply source 51, a cement supply source 52, a buffer tank 53, a supply passage 54, and an injection nozzle 55. The water supply source 51 supplies water to the injection nozzle 55 via a pipe 51a. The cement supply source 52 supplies cement to the buffer tank 53 via a pipe 52a. The buffer tank 53 stores the supplied cement and supplies it to the injection nozzle 55 via the supply passage 54. The provision of the buffer tank 53 suppresses fluctuations in the amount of cement supplied when mixing water and cement. The injection nozzle 55 injects the supplied mixture of water and cement toward the inner surface 101a of the chimney 101.

[0058] 8 is a diagram showing the configuration of another example of a concrete injection mechanism 50A. As in the concrete injection mechanism 50A shown in FIG. 8, a cyclone 56 and a feeder 57 may be provided instead of the buffer tank 53. In this configuration, the cement powder is separated by the cyclone 56, and a portion of it is agitated by the feeder 57 before being supplied to the injection nozzle 55. As with the buffer tank 53, this configuration suppresses fluctuations in the amount of cement supplied when mixing water and cement.

[0059] Next, an example of a chimney repair method using the chimney repair device 100 shown in Figure 7 will be described. First, the gondola 10 is assembled with the high-pressure water injection mechanism 30 described in the above embodiment attached to the injection level 12. After assembling the gondola 10, the gondola 10 is placed inside the chimney 101. Thereafter, the gondola 10 is lowered while the peeling process, metal removal process, and metal placement process are performed in parallel. This results in a state in which a new metal structure 103 is laid on the inner periphery of the barrel steel plate 102.

[0060] After the above steps are completed, the gondola 10 is lowered to the bottom of the chimney 101. After the gondola 10 is lowered, the high-pressure water injection mechanism 30 is removed from the injection level 12 and the concrete injection mechanism 50 is installed. In other words, the concrete injection mechanism 50 is installed in place of the high-pressure water injection mechanism 30. After the concrete injection mechanism 50 is installed, the gondola 10 is placed inside the chimney 101 again. Thereafter, the concrete injection mechanism 50 is injected from the concrete injection mechanism 50 while the gondola 10 is lowered. The concrete injection mechanism 50 injects concrete toward the inner surface 101a of the chimney 101 so as to cover the barrel steel plate 102 and the new metal structure 103. This forms a new concrete lining layer 104. After the concrete lining layer 104 is formed, the gondola 10 is lowered to the bottom of the chimney 101, completing the repair work.

[0061] Fig. 9 is a diagram showing an example of a time chart for the chimney repair method according to this embodiment. As shown in Fig. 9, in the chimney repair method according to this embodiment, a stripping process is performed on the lowest injection level 12 while the gondola 10 is descended, and a metal removal process and a metal placement process are performed in sequence on the upper level of the injection level 12. This allows the stripping process and the metal removal and metal placement processes to be performed in parallel, thereby shortening the overall work time.

[0062] In other words, as described above, by performing the peeling process on one level (injection level 12) and the metal removal process and metal placement process on the upper level, other processes (metal removal process, metal placement process) can be performed in parallel in time while the peeling process is being performed.

[0063] Furthermore, after the stripping, metal removal, and metal placement processes are completed, the gondola 10 is lowered to the bottom of the chimney 101 and the injection device on the injection level 12 is replaced with a concrete injection mechanism 50, allowing the stripping and lining formation processes to be carried out separately. During the stripping process, high-pressure water is injected, causing water to be contained in the atmosphere inside the chimney 101. When forming the concrete lining layer 104 under these circumstances, it may be necessary to adjust the moisture content of the injected concrete. In contrast, when the stripping and lining formation processes are carried out separately, this moisture adjustment is not necessary, making it easier to carry out the lining formation process.

[0064] In this way, the chimney repair device 100 of this embodiment comprises a gondola 10 that can move up and down inside the chimney 101, and a lifting mechanism 20 that raises and lowers the gondola 10, and the gondola 10 can be fitted with a plurality of interchangeable injection mechanisms, including a high-pressure water injection mechanism 30 that injects high-pressure water onto the inner surface 101a of the chimney 101, and a concrete injection mechanism 50 that injects concrete onto the inner surface 101a.

[0065] Furthermore, the chimney repair method according to this embodiment includes the steps of: placing a gondola 10, which has a removably attached high-pressure water jetting mechanism 30 at the lowest level, inside the chimney 101, the gondola 10 having a structure in which a metal structure 103 is arranged on the inner periphery of a barrel steel plate 102 and the metal structure 103 is covered with a concrete lining layer 104; lowering the gondola 10 while jetting high-pressure water onto the inner periphery 101a with the high-pressure water jetting mechanism 30 to peel off the concrete lining layer 104 on the inner periphery 101a; and, while the peeling is being performed by the high-pressure water jetting mechanism 30, removing the metal structure 103 exposed by the peeling, and repairing the inner periphery of the barrel steel plate 102 from which the metal structure 103 has been removed, on a level above the lowest level. the steps of lowering the gondola 10 to the bottom of the chimney 101, removing the high-pressure water injection mechanism 30 from the lowest level of the gondola 10, and attaching to the lowest level of the gondola 10 a concrete injection mechanism 50 that injects concrete onto the inner surface 101a of the chimney 101; the steps of placing the gondola 10 with the concrete injection mechanism 50 attached to the lowest level inside the chimney 101 with the metal structure 103 arranged on the inner circumference of the barrel steel plate 102; and the steps of lowering the gondola 10 while using the concrete injection mechanism 50 to inject concrete so as to cover the barrel steel plate 102 and the new metal structure 103, thereby forming a new concrete lining layer 104.

[0066] Therefore, by performing the stripping process on one level (injection level 12) and the metal removal process and metal placement process on the upper level, it is possible to perform other processes (metal removal process, metal placement process) in parallel with the stripping process. Also, when the stripping process and the lining formation process are performed separately, this type of moisture adjustment is not necessary, so the lining formation process can be performed easily.

[0067] The technical scope of the present invention is not limited to the above-described embodiment, and appropriate modifications can be made without departing from the spirit of the present invention. For example, in the above-described embodiment, the metal removal process is performed on the first working level 13, and the metal placement process and lining formation process are performed on the second working level. However, this is not limiting. For example, at least part of the metal placement process may be performed on the first working level.

[0068] In the above embodiment, the spraying device including the high-pressure water spraying device 30 and the concrete spraying device 50 is mounted on the lowest level of the gondola 10, but this is not limiting. The spraying device may be mounted on a level other than the lowest level of the gondola 10. For example, the concrete spraying device 50 as shown in FIG. 7 may be configured to be detachable from the second working level 14.

[0069] Furthermore, in the above embodiment, the lining layer formation process is performed in one step. However, this is not limiting. The lining layer formation process may be performed in multiple steps. For example, a portion of the concrete lining layer 104 may be formed in one step, dried, and then the remaining portion may be formed in one step. In this case, the stripping process, metal removal process, and metal placement process may be performed, as shown in FIG. 1, while a portion of the lining formation process is also performed. The gondola 10 is then lifted from the top of the chimney 101, and a portion of the concrete lining layer 104 is dried. After drying, the gondola 10 loaded with equipment and workers for forming the remaining portion of the concrete lining layer 104 may be placed inside the chimney 101 on the second working level 14 to perform the lining formation process. Alternatively, the gondola 10 with the high-pressure water spray device 30 replaced with a concrete spray device 50 may be placed inside the chimney 101 to perform the lining formation process.

[0070] Furthermore, in the above embodiment, an example has been described in which the gondola 10 is suspended in a state parallel to the central axis AX of the chimney 101 by the shaft member 11 arranged at a position including the central axis AX1, but this is not limiting. FIG. 10 is a diagram showing a chimney repair device according to a modified example. As in the gondola 10D in the chimney repair device 100D of FIG. 10, a configuration in which multiple struts 11D are arranged around the central axis AX4 instead of the shaft member 11 may be used. Although not shown, a configuration in which multiple struts 11D are arranged in addition to the shaft member 11 may also be used. [Explanation of symbols]

[0071] 10, 10A, 10B, 10D Gondola 11 Shaft member 11D post 12 injection hierarchy 13 First working layer 13F 1st floor 14 Second Working Layer 14th floor, 2nd floor 15 Ceiling 15a Guide roller 20 Lifting mechanism 21, 31A Hanging member 30, 30A, 30B, 30C High-pressure water injection mechanism 31,31C connection part 31B Telescopic link mechanism 32,32C Rod section 32A, 32B base part 32c,37b,38c Support part 33,33C Injection head 34,54 Supply channel 35 Feeding device 36 Connecting piping 37 Contact control mechanism 37a,38b Rolling part 37c Drive unit 37d Control section 38 Adjustment mechanism 38a swing arm 38e Spring member 40 Swivel mechanism 41 Rotation axis 50,50A Concrete injection mechanism 51 Water supply source 51a, 52a Piping 52 Cement Sources 53 Buffer Tank 55 Injection nozzle 56 Cyclone 57 Feeder 100, 100A, 100B, 100D Chimney repair equipment 101 Chimney 101a Inner surface 102 Cylindrical steel plate 103 Metal structures 104 Concrete lining layer AX,AX1,AX2,AX3,38d Center axis

Claims

1. a gondola capable of ascending and descending inside a chimney having a structure in which a metal structure is disposed on the inner periphery of a cylindrical steel body plate and the metal structure is covered with a concrete lining layer; a lifting mechanism for lifting and lowering the gondola; Equipped with The gondola is a jetting level that is disposed at the bottom in the vertical direction and that can be replaced with and equipped with a plurality of jetting mechanisms, including a high-pressure water jetting mechanism that jets high-pressure water onto the inner peripheral surface of the chimney to peel off the concrete lining layer and a concrete jetting mechanism that jets concrete onto the inner peripheral surface to form a new concrete lining layer; a working floor that is arranged in a plurality of floors in the vertical direction on the upper floor side of the injection floor and is capable of carrying equipment used for repair work inside the chimney; The plurality of work layers include: a first working level, which is disposed on an upper level of the jetting level and is equipped with at least equipment for removing the metal structure exposed when the concrete lining layer is peeled off by the high-pressure water jetting mechanism, and which is used to at least remove the metal structure; a second work story that is arranged on the upper side of the first work story, is equipped with at least equipment for laying a new metal structure on the inner periphery of the barrel steel plate from which the metal structure has been removed, and is used for at least laying the metal structure; have Chimney repair equipment.

2. The gondola has a rotating mechanism that rotates the injection mechanism. The chimney repair device according to claim 1.

3. The gondola further includes a contact prevention mechanism that prevents the injection mechanism from contacting the inner circumferential surface when the gondola is disposed inside the chimney. The chimney repair device according to claim 1 or 2.

4. The jetting mechanism is attached in a state of being suspended downward from the bottom of the gondola, The contact restriction mechanism adjusts the attitude of the injection mechanism so that the injection direction of the injection target in the injection mechanism is perpendicular to the central axis of the chimney. The chimney repair device according to claim 3.

5. the injection mechanism has a nozzle head that injects an injection target, The contact restriction mechanism has a nozzle head adjustment unit that adjusts the position and attitude of the nozzle head. The chimney repair device according to claim 4.

6. The concrete injection mechanism has a buffer tank for storing the concrete. The chimney repair device according to any one of claims 1 to 5.

7. The gondola is provided in multiple levels in the vertical direction. The chimney repair device according to any one of claims 1 to 6.

8. The injection mechanism is provided on the lowest floor in the vertical direction of the gondola. The chimney repair device according to claim 7.

9. a gondola capable of ascending and descending inside a chimney having a structure in which a metal structure is disposed on the inner periphery of a cylindrical steel body plate and the metal structure is covered with a concrete lining layer; a lifting mechanism for lifting and lowering the gondola; Equipped with The gondola is a vertically lowermost injection level on which a high-pressure water injection mechanism is installed that injects high-pressure water onto the inner peripheral surface of the chimney to peel off the concrete lining layer; a working floor that is arranged in a plurality of floors in the vertical direction on the upper floor side of the injection floor and is capable of carrying equipment used for repair work inside the chimney; The plurality of work layers include: a first working level, which is disposed on an upper level of the jetting level and is equipped with at least equipment for removing the metal structure exposed when the concrete lining layer is peeled off by the high-pressure water jetting mechanism, and which is used to at least remove the metal structure; a second work level, which is disposed on an upper level of the first work level and is equipped with at least equipment for laying a new metal structure on the inner periphery of the barrel steel plate from which the metal structure has been removed and equipment for forming a new concrete lining layer to cover the laid new metal structure, and which is used to at least lay the metal structure and form the concrete lining layer; have Chimney repair equipment.

10. a step of placing a gondola inside the chimney, the gondola having a vertically lowest injection level on which a high-pressure water injection mechanism for injecting high-pressure water onto the inner peripheral surface of the chimney, the chimney having a structure in which a metal structure is arranged on the inner periphery of a cylindrical steel body plate and the metal structure is covered with a concrete lining layer, is removably attached, and the gondola has a vertically lowest working level which is arranged in multiple levels above the injection level and is capable of carrying equipment used for repair work inside the chimney; a step of spraying high-pressure water onto the inner peripheral surface using the high-pressure water spraying mechanism of the spraying level while lowering the gondola, thereby peeling off the concrete lining layer on the inner peripheral surface, and while the peeling is being performed by the high-pressure water spraying mechanism, at least removing the metal structure exposed by the peeling on a first working level above the spraying level among the plurality of working levels, and at least laying a new metal structure on the inner peripheral surface of the barrel steel plate from which the metal structure has been removed on a second working level above the first working level; a step of lowering the gondola to the bottom of the chimney, removing the high-pressure water injection mechanism from the injection level of the gondola, and attaching a concrete injection mechanism that injects concrete onto the inner peripheral surface of the chimney to the injection level of the gondola; a step of raising the gondola, on which the concrete injection mechanism is attached to the injection level, to the top of the new metal structure inside the chimney in a state in which the metal structure is disposed on the inner periphery of the barrel steel plate; a step of forming a new concrete lining layer by injecting concrete using the concrete injection mechanism so as to cover the barrel steel plate and the new metal structure while lowering the gondola; A chimney repair method including:

11. a step of placing a gondola inside the chimney, the gondola having a vertically lowest injection level on which a high-pressure water injection mechanism for injecting high-pressure water onto the inner peripheral surface of the chimney, which has a structure in which a metal structure is arranged on the inner periphery of a cylindrical steel body plate and the metal structure is covered with a concrete lining layer, and a work level arranged in multiple levels vertically above the injection level and capable of carrying equipment used for repair work inside the chimney; a step of spraying high-pressure water onto the inner circumferential surface by the high-pressure water spraying mechanism of the spraying level while lowering the gondola, thereby peeling off the concrete lining layer on the inner circumferential surface; a step of at least removing the metal structure exposed by the peeling at a first working story above the jetting story among the plurality of working stories while performing the peeling by the high-pressure water jetting mechanism, and at least laying a new metal structure on the inner periphery of the barrel steel plate from which the metal structure has been removed and forming a new concrete lining layer to cover the new metal structure at a second working story above the first working story; A chimney repair method including:

Images