JP7724055B2 - Chimney repair device and chimney repair method - Google Patents

Description

This disclosure relates to a chimney repair device and a chimney repair method.

When repairing the inside of a chimney, a known method involves assembling a gondola capable of carrying 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).

Japanese Patent Application Publication No. 9-250249

When repairing the inside of such chimneys, there is a need to shorten the time required for the repair work.

This disclosure has been made in light of the above, and aims to provide a chimney repair device and chimney repair method that can shorten the work time required for chimney repair.

The chimney repair device disclosed herein comprises a gondola that can ascend and descend inside the chimney and that can carry equipment used in repair work, and an elevation mechanism that raises and lowers the gondola. 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.

The chimney repair method disclosed herein involves the steps of: placing a gondola, which has a removably attached high-pressure water spraying mechanism on the lowest level and which sprays high-pressure water onto the inner surface of a chimney structure in which a metal structure is placed on the inner periphery of a cylindrical steel barrel plate and the metal structure is covered with a concrete lining layer, inside the chimney; lowering the gondola while spraying high-pressure water onto the inner surface with the high-pressure water spraying mechanism to peel off the concrete lining layer on the inner surface; and, while the high-pressure water spraying mechanism is performing the peeling, removing the metal structure exposed by the peeling and laying a new metal structure on the inner periphery of the steel barrel plate from which the metal structure was removed, on a level above the lowest level. the steps 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 a concrete injection mechanism to the lowest level of the gondola that injects concrete onto the inner surface of the chimney; 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 positioned on the inner periphery of the barrel steel plate; and forming a new concrete lining layer by 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.

This disclosure makes it possible to shorten the work time required to repair a chimney.

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

Embodiments of the chimney repair device and chimney repair method according to the present disclosure will be described below 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.

Figure 1 is a schematic diagram showing an example of a chimney repair device 100 according to this embodiment. The chimney repair device 100 shown in Figure 1 is used when repairing the inside of a chimney 101. In this embodiment, the chimney 101 has 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 surface of the body steel plate 102, and a concrete lining layer 104 arranged to cover the metal structure 103.

The chimney repair device 100 shown in FIG. 1 comprises a gondola 10 and a lifting mechanism 20. The gondola 10 is sized to fit inside the chimney 101 and is capable of ascending and descending inside the chimney 101 by the lifting mechanism 20. The lifting mechanism 20 comprises 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 on the gondola 10 or on the ground. The gondola 10 is provided with multiple levels in the vertical direction. The gondola 10 comprises a shaft member 11, an injection level 12, a first working level 13, a second working level 14, and a ceiling section 15.

The shaft member 11 is arranged along the central axis AX1 of the gondola 10, spanning multiple floors in the vertical direction. In this embodiment, the gondola 10 is suspended with the central axis AX1 parallel to the central axis AX of the chimney 101.

The injection level 12 is located on the lowest level of the gondola 10. A high-pressure water injection mechanism 30 is attached to the inner surface 101a of the chimney 101 on the injection level 12. The high-pressure water injection mechanism 30 is removably attached to the injection level 12. Examples of high-pressure water injection mechanisms 30 include a high-pressure water injection mechanism that injects high-pressure water, a concrete injection mechanism that injects concrete, etc. In this case, the injection level 12 is equipped with an exchangeable injection mechanism, for example, including a high-pressure water injection mechanism and a concrete injection mechanism. In the example shown in Figure 1, a configuration in which a high-pressure water injection mechanism 30 is attached as the injection mechanism is described.

The high-pressure water injection mechanism 30 has a connecting portion 31, a rod portion 32, an injection head 33, and a supply flow path 34. The connecting portion 31 is the portion that is connected to the injection level 12. The connecting portion 31 is connected to a swivel mechanism 40 that is arranged on the injection level 12. The swivel 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, for example, formed in a cylindrical or columnar shape.

The injection heads 33 are provided on both ends of the rod portion 32 and are arranged facing away from each other relative to the central axis AX1. The injection heads 33 inject high-pressure water in opposite directions toward the inner surface 101a of the chimney 101. Therefore, when high-pressure water is injected from the injection heads 33, the generation of rotational moment about the central axis AX1 is suppressed, and the reaction force generated when the high-pressure water is injected can be canceled out. Furthermore, by tilting the injection heads 33 in the rotation direction, the high-pressure water injection mechanism 30 can generate a moment about the central axis AX1, thereby assisting the rotation of the gondola 10.

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

The swivel mechanism 40 rotates the high-pressure water spray 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 can be connected to a water supply source, and the supply passage 34 can 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 spray head 33 while rotating the high-pressure water spray mechanism 30. The water supply source can be disposed, for example, outside the chimney 101 on the ground.

The first working level 13 is located above the injection level 12. The first working 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, circular. 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 working 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.

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 is shaped to fit the inner circumference of the chimney 101, and in this embodiment is, for example, disk-shaped. While FIG. 1 shows an example in which the second floor 14F is formed to have the same or nearly the same diameter as the first floor 13F, 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.

The ceiling section 15 is located on the upper level of the second work level 14. A guide roller 15a is arranged on the ceiling section 15, rolling along the inner surface 101a of the chimney 101. The guide roller 15a is arranged to be movable in the radial direction. Therefore, the guide roller 15a can roll along the inner surface 101a while changing its position depending on the positional relationship between the ceiling section 15 and the inner surface 101a.

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 section of the chimney 101. Then, the gondola 10 is lowered by the lifting mechanism 20, while the following tasks are performed in order.

First, the concrete lining layer 104 on the inner 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 periphery of the barrel steel plate 102 from which the metal structure 103 was removed (metal placement process). Next, a new concrete lining layer 104 is formed to cover the newly placed metal structure 103 (lining formation process).

In this embodiment, the above-mentioned stripping process is carried out by spraying high-pressure water onto the inner surface 101a using the high-pressure water spraying mechanism 30 on the spray level 12 of the gondola 10. The stripping process strips the concrete lining layer 104, exposing the metal structure 103. As the gondola 10 descends while the stripping process is being carried out, the first working level 13 reaches the height position of the exposed portion of the metal structure 103.

When the first work level 13 reaches the height position of the exposed portion of the metal structure 103, workers on the first work level 13 perform the metal removal process described above. In this 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.

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

Furthermore, on the second work level 14, the above-mentioned lining formation process is carried out on the area where the new metal structure 103 has been laid. In other words, on the second work level 14, the laying of the new metal structure 103 and the formation of a new concrete lining layer 104 are carried out in that order. In the lining layer formation process, concrete is sprayed in the same direction as the metal placement process, following the area where the metal structure 103 has been laid in the metal placement process.

The metal removal process, metal placement process, and lining formation process can each be performed at positions offset around the axis from the position where the injection head 33 is located, as viewed from the axial direction of the central axis AX1. This reduces the impact of the spray of high-pressure water injected from the injection head 33.

In this way, as the gondola 10 descends, 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.

Figure 2 shows an example of a time chart for the chimney repair method according to this embodiment. As shown in Figure 2, in the chimney repair method according to this embodiment, the gondola 10 is constructed with multiple levels, and the stripping process, metal removal process, metal placement process, and lining formation process are performed in parallel, thereby shortening the overall work time.

In other words, of the four 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 longer than the total time T3 + T4 required for the metal placement process and 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.

As described above, the chimney repair device 100 according to this embodiment comprises a gondola 10 capable of ascending and descending inside the chimney 101, and a lifting mechanism 20 for raising and lowering the gondola 10. The gondola 10 has the vertically lowest injection level 12 on which a high-pressure water injection mechanism 30 for injecting 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 arranged vertically on the upper level side of the injection level 12 and capable of carrying equipment used for repair work inside the chimney.

The chimney repair method according to the present disclosure includes the steps of: placing a gondola 10 inside a chimney 101 having a cylindrical steel body plate 102 on the inner periphery of which a metal structure 103 is disposed and 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 vertically above the injection level 12 and capable of carrying equipment used for repair work inside the chimney 101. While the steel plate 102 is lowered, the following steps are carried out in sequence: a process in which high-pressure water is sprayed 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 process in which, while the high-pressure water spraying mechanism 30 is performing the peeling, the metal structure 103 exposed by the peeling is removed on the first work level 13 and the second work level 14; a process in which a new metal structure 103 is placed on the inner circumference of the body steel plate 102 from which the metal structure 103 has been removed; and a process in which a new concrete lining layer 104 is formed to cover the new metal structure 103.

As a result, the stripping process on the injection level 12 and the metal removal process, metal placement process, and lining layer formation process on the first and second work levels 13 and 14 can be carried out in parallel. This reduces the overall work time required to repair the chimney.

In the chimney repair device 100 according to this embodiment, the gondola 10 has a rotation mechanism 40 that rotates the high-pressure water injection mechanism 30. Therefore, the object to be injected by the high-pressure water injection mechanism 30 can be sprayed uniformly in the circumferential direction of the inner surface 101a of the chimney 101.

In the chimney repair device 100 according to this embodiment, the high-pressure water spray mechanism 30 is installed 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 of the gondola 10 to the upper floors.

The chimney repair device 100 can be configured, for example, as follows to prevent interference between the inner surface 101a of the chimney 101 and the high-pressure water injection mechanism 30.

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 explanation focuses on 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.

The hanging member 31A is attached to the shaft member 11 of the gondola 10A. The base portion 32A is suspended 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.

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
The values of DW and H are set so as to satisfy the following.

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

Figure 4 shows 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 explanation focuses on 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.

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 longitudinally 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.

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 32B and sends water to the supply flow path 34. The connection pipe 36 supplies water to the supply device 35.

The contact prevention mechanism 37 prevents the high-pressure water injection mechanism 30 from contacting the inner circumferential surface 101a when the gondola 10B is placed inside the chimney 101. As shown in FIG. 5, the contact prevention mechanism 37 has 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 and is capable of rolling. For example, while in contact with the inner circumferential surface 101a, the rolling portion 37a can rotate 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 drive unit 37c has a detection unit that adjusts the amount of protrusion of the support unit 37b. Examples of such drive 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 drive units 37c are arranged in sets of four, for example, at 90° intervals around the central axis AX3 of the high-pressure water injection mechanism 30B.

Each drive unit 37c transmits the detection results from the detection unit 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 surface 101a of the chimney 101 is a preset value. This configuration prevents interference between the high-pressure water injection mechanism 30B and the inner surface 101a of the chimney 101.

Also, as shown in FIG. 5, the spray head 33 may be configured to be adjustable in distance from the inner circumferential surface 101a and in spray angle relative 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 spray 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 is controlled by the control unit 37d, the above-mentioned rolling unit 37a, support unit 37b, and 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 relative to 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 determined tilt angles are each 0 and the determined distance is a predetermined distance.

The control unit 37d may control at least one of the telescopic link mechanism 31B and the injection head 33.

The above control by the control unit 37d can be applied, for example, when placing the gondola 10B inside the chimney 101 and adjusting its position relative to the inner circumferential surface 101a before actually performing repair work. This allows repair work to begin with the position of the high-pressure water injection mechanism 30 and the inner circumferential surface 101a properly set.

The above control by the control unit 37d can also be applied, for example, when adjusting the position of the gondola 10B and the inner circumferential surface 101a while repair work is actually being performed. This allows the position of the high-pressure water spray mechanism 30 and the inner circumferential surface 101a to be maintained appropriately even while repair work is being performed.

Note that while the configurations in Figures 4 and 5 have been described as an example in which detection is performed by the drive unit 37c while the rolling unit 37a is in contact with the inner circumferential surface 101a, this is not limiting. For example, a non-contact detection unit capable of detecting the amount of protrusion of the support unit 37b may be provided instead of or in addition to the rolling unit 37a and drive unit 37c.

Figure 6 is a diagram showing a modified spray device. In the high-pressure water spray mechanism 30B shown in Figures 4 and 5, the drive unit 37c detects the amount of protrusion of the support unit 37b and adjusts the position and posture of the spray head 33 based on the detection results. However, this is not limiting. The high-pressure water spray mechanism 30C shown in Figure 6 has a connecting unit 31C, a rod unit 32C, a spray head 33C, a supply flow path 34, and an adjustment mechanism 38. The connecting unit 31C, rod unit 32C, and spray head 33C are configured similarly to the connecting unit 31, rod unit 32, and spray head 33 of the above embodiment.

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 that it can swing around 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 so that it protrudes vertically from the support portion 32c. The upper portion of the swing arm 38a is bent radially outward from the high-pressure water injection mechanism 30C. The rolling portion 38b is rotatably supported at the tip of this bent portion. The 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 surface 101a of the chimney 101.

The swing arm 38a swings around the central axis 38d due to the displacement of the rolling portion 38b. The swing arm 38a supports the ejection head 33C. As the swing arm 38a swings, the position and posture of the ejection head 33C supported by the swing arm 38a change.

In this way, the position and posture of the injection head 33C can be changed in conjunction with the displacement of the rolling portion 38b and the swing of the swing arm 38a, thereby preventing interference between the injection head 33C and the inner circumferential surface 101a in the environment inside the chimney 101 without using detection equipment such as sensors.

Figure 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 a high-pressure water injection mechanism 30 attached to the injection level 12, this is not limiting. As shown in Figure 7, the chimney repair device 100 can also perform repair work with a concrete injection mechanism 50 attached instead of the high-pressure water injection mechanism 30.

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 piping 51a. The cement supply source 52 supplies cement to the buffer tank 53 via piping 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.

Note that Figure 8 is a diagram showing the configuration of another example of a concrete injection mechanism 50A. As with the concrete injection mechanism 50A shown in Figure 8, a cyclone 56 and a feeder 57 may be provided instead of the buffer tank 53. In this configuration, the cyclone 56 separates the cement powder, 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.

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. Then, while the gondola 10 is lowered, the peeling process, metal removal process, and metal placement process are performed in parallel. This results in a new metal structure 103 being laid on the inner periphery of the barrel steel plate 102.

After completing the above steps, 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. The gondola 10 is then lowered, and concrete is injected from the concrete injection mechanism 50. 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 has been formed, the gondola 10 is lowered to the bottom of the chimney 101, completing the repair work.

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

In other words, as described above, by performing the stripping 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 carried out in parallel while the stripping process is being carried out.

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.

As such, the chimney repair device 100 according to this embodiment comprises a gondola 10 capable of ascending and descending inside the chimney 101, and a lifting mechanism 20 for raising and lowering the gondola 10. The gondola 10 can be fitted with a number of interchangeable injection mechanisms, including a high-pressure water injection mechanism 30 for injecting high-pressure water onto the inner surface 101a of the chimney 101, and a concrete injection mechanism 50 for injecting concrete onto the inner surface 101a.

The chimney repair method according to this embodiment includes the steps of: placing a gondola 10 removably attached to the lowest level of a high-pressure water injection mechanism 30 that injects high-pressure water onto the inner peripheral surface 101a of a chimney 101, the chimney 101 having a structure in which a metal structure 103 is disposed on the inner periphery of a barrel steel plate 102 and the metal structure 103 is covered with a concrete lining layer 104; and, while lowering the gondola 10, spraying high-pressure water onto the inner peripheral surface 101a with the high-pressure water injection mechanism 30 to peel off the concrete lining layer 104 from the inner peripheral surface 101a; and, while the high-pressure water injection mechanism 30 is performing the peeling, removing the metal structure 103 exposed by the peeling, and repairing the inner peripheral surface 101a 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 a concrete injection mechanism 50 to the lowest level of the gondola 10 for injecting 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 positioned on the inner periphery of the barrel steel plate 102; and the steps of using the concrete injection mechanism 50 to inject concrete onto the barrel steel plate 102 and the new metal structure 103 while lowering the gondola 10 to form a new concrete lining layer 104.

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, other processes (metal removal process, metal placement process) can be carried out in parallel with the stripping process. Furthermore, if the stripping process and lining formation process are carried out separately, this type of moisture adjustment is not necessary, making it easier to carry out the lining formation process.

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

In addition, in the above embodiment, an example was described in which the injection device, including the high-pressure water injection device 30 and the concrete injection device 50, is mounted on the lowest level of the gondola 10, but this is not limited to this. The injection device may be mounted on a level other than the lowest level of the gondola 10. For example, the concrete injection device 50 shown in Figure 7 may be configured to be detachable from the second working level 14.

In addition, in the above embodiment, the lining layer formation process is performed in a single process, but this is not limiting. The lining layer formation process may be performed in multiple processes. For example, a portion of the concrete lining layer 104 may be formed in a single process, dried, and then the remaining portion may be formed in a single process. 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 carrying equipment and workers for forming the remaining portion of the concrete lining layer 104 may be placed inside the chimney 101, for example, on the second working level 14, and the lining formation process may be performed therein. Alternatively, a gondola 10 with the high-pressure water spray device 30 replaced with a concrete spray device 50 may be placed inside the chimney 101 and the lining formation process may be performed therein.

In addition, in the above embodiment, an example was described in which the gondola 10 is suspended parallel to the central axis AX of the chimney 101 by an axis member 11 arranged at a position including the central axis AX1, but this is not limited to this. Figure 10 is a diagram showing a chimney repair device according to a modified example. As with the gondola 10D in the chimney repair device 100D of Figure 10, instead of the axis member 11, multiple struts 11D may be arranged around the central axis AX4. Although not shown in the figure, multiple struts 11D may be arranged in addition to the above-mentioned axis member 11.

10, 10A, 10B, 10D Gondola 11 Shaft member 11D Support 12 Jetting floor 13 First working floor 13F First floor 14 Second working floor 14F Second floor 15 Ceiling 15a Guide roller 20 Lifting mechanism 21, 31A Hanging member 30, 30A, 30B, 30C High-pressure water jetting mechanism 31, 31C Connecting portion 31B Telescopic link mechanism 32, 32C Rod portion 32A, 32B Base portion 32c, 37b, 38c Support portion 33, 33C Jetting head 34, 54 Supply flow path 35 Supply device 36 Connection pipe 37 Contact restriction mechanism 37a, 38b Rolling portion 37c Drive portion 37d Control portion 38 Adjustment mechanism 38a Swing arm 38e Spring member 40 Swiveling mechanism 41 Rotating shaft 50, 50A Concrete injection mechanism 51 Water supply source 51a, 52a Pipe 52 Cement supply source 53 Buffer tank 55 Injection nozzle 56 Cyclone 57 Feeder 100, 100A, 100B, 100D Chimney repair device 101 Chimney 101a Inner surface 102 Steel body plate 103 Metal structure 104 Concrete lining layer AX, AX1, AX2, AX3, 38d Central axis

Claims (11)

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,
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 level that is arranged on an upper level of the first work level, is equipped with at least equipment for laying a new metal structure on the inner circumference of the barrel steel plate from which the metal structure has been removed, and is used for at least laying the metal structure. The chimney repair device according to claim 1 , wherein the gondola has a swiveling mechanism for swiveling the injection mechanism. The chimney repair device according to claim 1 or 2, further comprising a contact restriction mechanism that restricts the jet mechanism from contacting the inner circumferential surface when the gondola is disposed inside the chimney. The jetting mechanism is attached in a state of being suspended downward from the bottom of the gondola,
The chimney repair device according to claim 3, wherein 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 injection mechanism has a nozzle head that injects an injection target,
The chimney repair device according to claim 4 , wherein the contact restriction mechanism includes a nozzle head adjustment unit that adjusts the position and attitude of the nozzle head. The chimney repair device according to any one of claims 1 to 5, wherein the concrete injection mechanism has a buffer tank that stores the concrete. The chimney repair device according to any one of claims 1 to 6, wherein the gondola is provided in a plurality of levels in the vertical direction. The chimney repair device according to claim 7, wherein the injection mechanism is provided on the lowest floor in the vertical direction of the gondola. 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,
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 arranged 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 circumference 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. 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;
and a step of injecting concrete using the concrete injection mechanism to cover the barrel steel plate and the new metal structure while lowering the gondola, thereby forming a new concrete lining layer. 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 chimney repair method including the steps of: while performing peeling using the high-pressure water injection mechanism, at least removing the metal structure exposed by the peeling on a first working level above the injection level among the plurality of working levels; and at least laying a new metal structure on the inner circumference 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 on a second working level above the first working level.